JP2002008857A - Discoloration display device and electronic device - Google Patents

Abstract

(57) [Problem] To provide a discoloration display device and an electronic device that can easily and easily display and display light with a simple circuit configuration and wiring, and control is unnecessary or simplified. A discoloration display device includes a first substrate, an anode, an organic EL layer, a cathode, and a second substrate. The organic EL layer 4 includes a plurality of unit organic EL layers 44 that emit red light and a plurality of unit organic E layers that emit green light.
L layer 44 and a plurality of unit organic EL layers 44 emitting blue light
It is composed of

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a color change display device and an electronic device.

[0002]

2. Description of the Related Art There is known a power supply voltage display (power supply voltage indicator) for displaying a remaining amount (voltage) of a power supply (for example, a battery) of an electronic device.

A typical power supply voltage display device is disclosed in, for example, JP-A-59-27267.

This power supply voltage display device has two light-emitting elements (green light-emitting element and red light-emitting element) having different emission colors.
And two driving means (green light emitting element driving means and red light emitting element driving means) for driving these light emitting elements, detecting means for detecting a power supply voltage, and driving (switching) the driving means based on the result. And control means for controlling the

In this power supply voltage display device, when the detected power supply voltage is equal to or higher than a predetermined voltage, only the green light emitting element driving means is driven to turn on only the green light emitting element. Then, when the power supply voltage decreases and reaches a predetermined voltage, the green light emitting element driving means and the red light emitting element driving means are driven to light the green light emitting element and the red light emitting element.
When the power supply voltage further decreases and reaches a predetermined voltage, the driving of the green light emitting element driving means is stopped, and only the red light emitting element driving means is driven to light only the red light emitting element. The user can grasp the remaining amount of the power supply stepwise (three steps) from the emission colors (green / both / red).

However, in the power supply voltage display device, in addition to the light-emitting elements, detection means (for example, an A / D converter, a comparator, etc.) for detecting the power supply voltage, and driving of the drive means based on the result. Control means (for example, I
C, a memory storing a table of data used for control, etc.) and the like, and two lines of wiring, a line for emitting green light and a line for emitting red light, are required.

For this reason, the number of parts is large and the circuit configuration is complicated.

Further, there is a disadvantage that the lighting control (switching control) of the light emitting element must be performed, and the control becomes complicated as the emission color increases.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a discoloration display device and an electronic device which can easily and easily display and emit light with a simple circuit configuration and wiring, and can eliminate or simplify control. It is in.

[0010]

This and other objects are achieved by the present invention which is defined below as (1) to (31).

(1) An anode, a cathode, and a light emitting layer provided between the anode and the cathode. The light emitting layer is formed by applying a voltage between the cathode and the anode. It is a discoloration display device that emits light, with a change in the voltage,
A color changing display device, wherein the color of the light emitting layer is changed.

(2) An anode, a cathode, and a light emitting layer provided between the anode and the cathode, and the light emitting layer is formed by applying a voltage between the cathode and the anode. It is a discoloration display device that emits light, with a change in the voltage,
A color changing display device, wherein the color of the light emitted from the light emitting layer changes, and the magnitude of the voltage is displayed by the color of the light emitted.

(3) The discoloration display device according to (1) or (2), wherein the light emitting layer is an organic electroluminescence layer.

(4) The color change display device according to any one of (1) to (3), wherein the light emitting layer has a plurality of light emitting materials having different light emitting characteristics.

(5) The discoloration display according to any one of (1) to (3), wherein the light-emitting layer has a plurality of light-emitting materials having different threshold voltages, which are minimum voltages for light emission, and different light-emitting colors. apparatus.

(6) The color changing display device according to (5), wherein the threshold voltage is within a range of an operating voltage of an electronic device provided with the color changing display device.

(7) The color change display device according to any one of (1) to (6), wherein the light emitting layer is constituted by a plurality of unit light emitting layers.

(8) The color change display device according to any one of (1) to (6), wherein the light emitting layer is constituted by a plurality of unit light emitting layers having different emission colors.

(9) The color-change display device according to (7) or (8), wherein at least a portion of the unit light-emitting layer that emits light is formed in a dot shape.

(10) The color-change display device according to (9), wherein at least a portion of the plurality of unit light-emitting layers that emit light is arranged in a matrix.

(11) At least a portion of the unit light emitting layer which emits light is formed in a belt shape.
Or the discoloration display device according to (8).

(12) The color-change display device according to any one of (1) to (6), wherein the light-emitting layer is formed by stacking a plurality of unit light-emitting layers.

(13) The discoloration display device according to any one of (1) to (6), wherein the light emitting layer is formed by stacking a plurality of unit light emitting layers having different emission colors.

(14) The color changing display device according to any one of (1) to (3), wherein the light emitting layer has a material obtained by mixing a plurality of light emitting materials having different light emitting characteristics.

(15) The light-emitting layer according to any one of the above (1) to (3), wherein the light-emitting layer has a different threshold voltage, which is a minimum voltage for light emission, and a material obtained by mixing a plurality of light-emitting materials having different emission colors. A discoloration display device according to Crab.

(16) The color changing display device according to (15), wherein the threshold voltage is within a range of an operating voltage of an electronic device provided with the color changing display device.

(17) The voltage applied between the cathode and the anode is a voltage of a power supply of an electronic device provided with the discoloration display device, and the emission color of the light emitting layer determines the remaining amount of the power supply. The discoloration display device according to any one of the above (1) to (16).

(18) The above (1) to (1), which are configured to continuously change the emission color of the light emitting layer.
The discoloration display device according to any one of 7).

(19) The above (1) to (18), wherein the luminance of the light emitted from the light emitting layer changes with the change of the voltage applied between the cathode and the anode. A discoloration display device according to any one of the above.

(20) The discoloration display device according to the above (19), which is configured to be able to continuously change the luminance.

(21) An anode, a cathode, and a light emitting layer provided between the anode and the cathode. The light emitting layer is formed by applying a voltage between the cathode and the anode. A discoloring display device that emits light, wherein at least one of the anode and the cathode is divided into a plurality of regions, and by changing an applied voltage to each of the regions, the respective regions can emit light with different emission colors. A discoloration display device characterized by being possible.

(22) The color-change display device according to (21), wherein the light-emitting layer is formed so as to extend between the respective regions.

(23) The light emitting device according to the above (2), wherein the emission color of the light emitting layer changes with the change of the voltage.
The discoloration display device according to 1) or (22).

(24) The color-change display device according to any one of (21) to (23), wherein the light-emitting layer is an organic electroluminescence layer.

(25) An electronic device comprising the discoloration display device according to any one of (1) to (24).

(26) The electronic device according to (25), wherein the electronic device is a portable electronic device.

(27) The electronic device has a display unit for displaying information, and the discoloration display device is provided on the side opposite to the display side of the display unit (25) or (26).
An electronic device according to claim 1.

(28) The electronic device according to any one of (25) to (27), wherein the electronic device has a display unit for displaying information, and the discoloration display device has a function of illuminating the display unit. apparatus.

(29) The electronic device according to any one of (25) to (28), further including a voltage displacing means for increasing or decreasing a voltage applied between the cathode and the anode.

(30) The electronic device according to any one of the above (25) to (29), further comprising voltage holding means for holding a voltage applied between the cathode and the anode substantially constant.

(31) The above-mentioned (2) further comprising a voltage adjusting means for adjusting a voltage applied between the cathode and the anode.
An electronic device according to any one of 5) to (30).

[0042]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a discoloration display device and an electronic device according to the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

FIG. 1 is a longitudinal sectional view schematically showing the configuration of the first embodiment of the color change display device of the present invention.

In the following description, the lower side in FIG. 1 is referred to as “front”, and the upper side is referred to as “back” (the same applies to FIG. 3).

As shown in FIG. 1, the discoloration display device 1 includes an anode 3, a cathode 5, and an organic electroluminescent layer (light emitting layer) 4 provided between the anode 3 and the cathode 5. Have. On the front surface of the anode 3 (the surface of the anode 3 opposite to the organic electroluminescent layer 4), the first substrate 2 is provided, and on the back surface of the cathode 5 (the organic electroluminescent layer of the cathode 5). On the side opposite to the luminescent layer 4)
A second substrate 6 is provided. Hereinafter, the organic electroluminescence layer is referred to as an “organic EL layer”.

In such a discoloration display device 1, the anode 3 and the cathode 5 are connected to the power supply 9, and the anode 3 and the cathode 5 are energized, that is, a voltage (power supply voltage) is applied between the anode 3 and the cathode 5. By applying the voltage, the organic EL layer 4 (the portion where the anode 3, the cathode 5, and the organic EL layer 4 are all overlapped) emits light, and display (light emission display) is performed. Then, the user visually recognizes the light-emitting display from the front side (anode side). In the present specification, the term “user” is used to mean a person who visually recognizes a light-emitting display or the like of the discoloration display device 1.

The anode 3, the cathode 5, and the organic EL layer 4
The above-mentioned portion has an essential function of the discoloration display device 1 called light emission.

The following is a description of each component.

The first substrate 2 is a support member for supporting the anode 3, and is made of, for example, a plate-like member. As described above, in the discoloration display device 1, light emission is viewed from the front side, that is, from the first substrate 2 side. Therefore, the first
Substrate 2 is substantially transparent (colorless transparent, colored transparent). From such a viewpoint, the first substrate 2
Is made of, for example, a glass material, various ceramic materials, various plastic materials (for example, polycarbonate resin or the like).

On the rear surface of the first substrate 2, a layered (flat) anode 3 is provided. The anode 3 has a function of receiving holes from the power supply 9 and providing holes to a hole transport layer 41 described later. Further, since the anode 3 is provided on the side where light emission is viewed, the anode 3 is substantially transparent (colorless transparent, colored transparent or translucent). From such a viewpoint, for example, indium tin oxide (ITO), tin oxide (SnO ₂ ), indium oxide (IO), indium zinc oxide (IZO), or the like is used for the anode 3. The thickness of the anode 3 is preferably, for example, about 50 to 500 nm.

An organic EL layer (light-emitting layer) 4 is provided on the rear surface of the anode 3. This organic EL layer 4 is formed as shown in FIG.
As shown in (1), it has a hole transport layer 41 and an electron transport layer 42, and the hole transport layer 41 is joined to the anode 3 and the electron transport layer 42 is joined to the cathode 5, respectively.

The hole transport layer 41 has a function of receiving holes from the anode 3 and transmitting and transporting the holes to the cathode 5.

On the other hand, the electron transport layer 42 has a function of receiving electrons from the cathode 5 and transporting (transmitting) the electrons to the anode 3 side.

When a current is applied (a voltage is applied) between the anode 3 and the cathode 5, holes move in the hole transport layer 41 and electrons move in the electron transport layer 42. Near the interface with the hole transport layer 41, both recombine. Exciton (exciton) is generated by the energy released at the time of this recombination, and the exciton emits energy (fluorescence / phosphorescence) when returning to the ground state.
That is, the vicinity of the interface between the electron transport layer 42 and the hole transport layer 41 constitutes a layered light emitting section 43. Therefore,
It can be said that the organic EL layer 4 is composed of three layers with the light emitting section 43 as an intermediate layer.

The organic EL layer 4 applies a voltage applied between the anode 3 and the cathode 5 (hereinafter simply referred to as “applied voltage”).
Is configured so that the emission color of the organic EL layer 4 changes in accordance with the change in the color. Hereinafter, the configuration of the organic EL layer 4 will be specifically described.

FIG. 2 is a plan view (view from the front side) schematically showing the organic EL layer 4 of the color changing display device 1.

As shown in the figure, the organic EL layer 4 includes a plurality of unit organic EL layers (unit light emitting layers) 44 having different emission colors.
That is, a plurality of unit organic EL layers 44 emitting red light
And a plurality of unit organic EL layers 44 that emit green light and a plurality of unit organic EL layers 44 that emit blue light. Hereinafter, the unit organic EL layer that emits red light is simply referred to as “R unit organic EL layer”, the unit organic EL layer that emits green light is referred to simply as “G unit organic EL layer”, and the unit organic E that emits blue light.
The L layer is simply referred to as “B unit organic EL layer”.

In this case, as shown in FIG. 1, only the electron transport layer 42 of the organic EL layer 4 is composed of a plurality of unit layers, and the hole transport layer 41 Are formed (solid).

In the present invention, each of the hole transport layer 41 and the electron transport layer 42 may be composed of a plurality of unit layers.

However, in the point that the manufacturing is easy and the accuracy can be further increased, the organic EL
It is preferable that only the electron transport layer 42 of the layer 4 be composed of a plurality of unit layers.

As shown in FIG. 2, each unit organic EL layer 44
Each of the electron transport layers 42 has a point shape and is formed so that the area in plan view (hereinafter, simply referred to as “area”) is substantially the same. The electron transport layers 42 of the unit organic EL layers 44 are arranged in a matrix. Here, in the present embodiment, the shape of the electron transport layer 42 of the unit organic EL layer 44 in a plan view is substantially circular. However, the present invention is not limited to this, and may be, for example, an ellipse, a square (for example, a square). , Rectangle) and the like.

Electron transport layer 42 of R unit organic EL layer 44
Are arranged at equal intervals in the vertical direction in FIG. 2 on the leftmost side in FIG. 2 among the formation positions of the unit organic EL layers 44.

The electron transport layer 42 of the G unit organic EL layer 44 is arranged on the right side of the row of the electron transport layer 42 of the R unit organic EL layer 44 in FIG. The electron transport layer 4 of the unit organic EL layer 44 of B is juxtaposed at equal intervals.
2 are arranged on the right side in FIG. 2 of the row of the electron transport layers 42 of the G unit organic EL layers 44 at equal intervals in the vertical direction in FIG.

Similarly, the electron transport layer 42 of the R, G and B unit organic EL layers 44 is changed from the left to the right in FIG. The unit organic EL layers 44 and B are arranged in this order.

The pitch of the electron transport layer 42 of the unit organic EL layer 44 in the vertical direction (row direction) in FIG. 2 is not particularly limited, but is preferably, for example, about 10 μm to 1 mm, and about 50 to 400 μm. Is more preferred.

The electron transport layer 4 of the unit organic EL layer 44
2, the pitch in the horizontal direction (row direction) in FIG. 2 is not particularly limited, but is preferably, for example, about 10 μm to 1 mm, and more preferably about 50 to 400 μm.

By setting the pitch of the unit organic EL layer 44 as described above, the entire emission color of the organic EL layer 4 can be made more uniform, thereby further improving the visibility.

In the present embodiment, the electron transport layers 42 of adjacent unit organic EL layers 44 are configured so as not to contact each other. However, in the present invention, the electron transport layers 42 of adjacent unit organic EL layers 44 are not contacted. Some or all of them may be in contact with each other.

In the present invention, the arrangement, order, pattern and the like of the electron transport layer 42 of the unit organic EL layer 44 are not limited to those shown in the drawings. The electron transport layer 42 of the unit organic EL layer 44 may be arranged irregularly, and a predetermined pattern, figure, numeral, Characters and the like may be displayed.

In the present embodiment, the electron transport layer 42 of each unit organic EL layer 44 is formed to have substantially the same area. However, the present invention is not limited to this.
The area of the electron transport layer 42 of the R unit organic EL layer 44 and the area of the electron transport layer 42 of the G unit organic EL layer 44 may be different, and the electron transport layer 42 of the R unit organic EL layer 44 may be different.
And the area of the electron transport layer 42 of the B unit organic EL layer 44 may be different, and the electron transport layer 42 of the G unit organic EL layer 44 and the electron transport layer 4 of the B unit organic EL layer 44 may be different.
2 may have different areas, and the unit organic E of R
The area of the electron transport layer 42 of the L layer 44, the area of the electron transport layer 42 of the G unit organic EL layer 44, and the area of the electron transport layer 42 of the B unit organic EL layer 44 may be different. The electron transport layer 42 of the unit organic EL layer 44 may have a different area.

By changing the area of the electron transport layer 42 of the unit organic EL layer 44 in this manner, the unit organic EL layer 44
Of the organic EL layer 4 can be changed without changing the light emission characteristics of the organic EL layer 4 (for example, the threshold voltage or the emission color, which is the lowest voltage at which the unit organic EL layer 44 emits light). That is, the degree of freedom in setting the emission characteristics of the organic EL layer 4 is increased.

As a constituent material of the hole transport layer 41, for example, an aromatic amine derivative (TPD, α-NPD, etc.) and the like can be mentioned, and among them, α-NPD is more preferably used. The thickness of the hole transport layer 41 is not particularly limited, but is, for example, preferably about 1 to 100 nm, and more preferably about 20 to 70 nm. By setting the thickness of the hole transport layer 41 within the above range, the holes received from the anode 3 can be more reliably provided to the light emitting unit 43.

The constituent material (light emitting material) of the electron transport layer 42 is, for example, a material in which 8-quinolinol aluminum complex (Alq ₃ ) contains one or more light emitting materials (fluorescent materials). Used.

In this case, for example, a luminescent substance (fluorescent substance)
By changing the type, the addition amount, and the like, the light-emitting portion 43 having arbitrary light-emitting characteristics (for example, a threshold voltage, a light-emitting color, a change in luminance with respect to an applied voltage, a magnitude, and the like) can be obtained.

As such a luminescent substance (fluorescent substance), for example, the following substances can be used.

Examples of the luminescent material (fluorescent material) used for the R unit organic EL layer 44, that is, those having a red luminescent color include rhodamine and derivatives of DCM.

The luminescent substance (fluorescent substance) used for the G unit organic EL layer 44, that is, the substance having a green luminescent color includes, for example, quinacridone, coumarin 6 and the like.

As a light emitting substance (fluorescent substance) used for the unit organic EL layer 44 of B, that is, a substance having a blue light emission color, for example, perylene or the like can be mentioned.

The thickness of the electron transport layer 42 is not particularly limited, but is, for example, preferably about 1 to 100 nm, and more preferably about 20 to 70 nm. By setting the thickness of the electron transport layer 42 within the above range, the electrons received from the cathode 5 can be more reliably given to the light emitting section 43.

The thickness of the light emitting section 43 is not particularly limited, but is preferably, for example, about 0.1 to 20 nm.

The method for forming the organic EL layer 4, that is,
The method for forming each unit organic EL layer 44 is not particularly limited. Hereinafter, a case where the organic EL layer 4 is formed typically by a vacuum evaporation method (gas phase film forming method) will be described.

FIG. 31 shows an organic EL layer 4 formed by vacuum evaporation.
FIG. 4 is a diagram for explaining a method of forming a semiconductor device.

First, the first substrate 2 on which the anode 3 has been formed is set in a predetermined vacuum evaporation apparatus (film forming apparatus), and the vacuum evaporation apparatus is operated, and the first substrate 2 of the anode 3 and the first substrate 2 are formed. The hole transport layer 41 is formed on the opposite surface. Needless to say, the hole transport layer 41 may be formed by a method other than the vacuum evaporation method.

Next, as shown in FIG. 31A, a mask 45 is set below the hole transport layer 41 in FIG.

The mask 45 has a plurality of openings 45 corresponding to the shape and pattern of the electron transport layer 42 to be formed.
1 is formed. That is, the shape and pattern of these openings 451 are set to be the same as, for example, the electron transport layer 42 of the unit organic EL layer 44 for R to be formed.

The mask 45 can be moved in the horizontal direction in FIG. 31 by a driving mechanism (not shown).

As shown in FIG. 31A, the mask 4
After setting 5, the vacuum evaporation apparatus is operated, and the material of the electron transport layer 42 of the R unit organic EL layer 44 (evaporation not shown) is directed toward the surface of the hole transport layer 41 opposite to the anode 3. By heating the source, the evaporation material is melted and evaporated).

At this time, the opening 45 is formed by the mask 45.
The formation of the electron transport layer 42 on the hole transport layer 41 from other than 1 is prevented, and the R unit organic EL layer having a predetermined shape and pattern is formed on the surface of the hole transport layer 41 opposite to the anode 3. 4
Four electron transport layers 42 are formed.

Next, the mask 45 is placed on the right side in FIG.
The electron transport layer 42 is moved by one pitch in the horizontal direction in FIG. Then, as shown in FIG. 31B, the vacuum evaporation apparatus is operated to move the electron transport layer 42 of the G unit organic EL layer 44 toward the surface of the hole transport layer 41 opposite to the anode 3.
Supply material.

At this time, the opening 45 is formed by the mask 45.
The formation of the electron transport layer 42 on the hole transport layer 41 from other than 1 is prevented, and the G unit organic EL layer having a predetermined shape and pattern is formed on the surface of the hole transport layer 41 opposite to the anode 3. 4
Four electron transport layers 42 are formed.

Next, the mask 45 is placed on the right side in FIG.
The electron transport layer 42 is moved by one pitch in the horizontal direction in FIG. Then, as shown in FIG. 31C, the vacuum evaporation apparatus is operated to move the electron transport layer 42 of the unit organic EL layer 44 of B toward the surface of the hole transport layer 41 opposite to the anode 3.
Supply material.

At this time, the opening 45 is formed by the mask 45.
The formation of the electron transport layer 42 on the hole transport layer 41 from other than 1 is prevented, and the unit organic EL layer of B having a predetermined shape and pattern is formed on the surface of the hole transport layer 41 opposite to the anode 3. 4
Four electron transport layers 42 are formed.

Note that, for example, the electron transport layers 42 of the R, G, and B unit organic EL layers 44 are formed by using a mask 45 in which openings 451 are formed in a row in a direction perpendicular to the plane of FIG. The columns may be formed sequentially.

By using such a method, the electron transport layer 42 having an arbitrary shape and pattern can be easily and accurately formed.

In the present invention, the organic EL layer 4, that is, each unit organic EL layer 44 (in particular, each unit organic EL layer 4
The fourth electron transport layer 42) may be formed by inkjet printing.

The formation method (manufacturing method) by ink-jet printing means that a predetermined composition (discharge liquid) is discharged (spouted) from a head by an ink-jet method, and a predetermined thin film (layer) material is pattern-formed. And a method of solidifying it into a thin film. Hereinafter, the organic EL layer 4 specifically formed by inkjet printing will be described.
The method for forming the film will be described.

FIG. 4 is a diagram for explaining a method of forming the organic EL layer 4 by inkjet printing.

First, on the hole transport layer 41, the electron transport layer 42 of the unit organic EL layer 44 for R, G and B prepared in advance.
The composition for each is pattern-formed by the inkjet method. That is, as shown in FIG. 4, an ink jet head (ink jet printer head) 40 is used.
A predetermined pattern is formed by ejecting the composition for the electron transport layer 42 of the R unit organic EL layer 44 from one nozzle 402, and the unit organic EL of G is ejected from the nozzle 402 of the head 401.
The composition for the electron transporting layer 42 of the layer 44 is ejected to form a predetermined pattern, and the B
The composition for the electron transport layer 42 of the unit organic EL layer 44 is ejected to form a predetermined pattern. The order of pattern formation of the composition for the electron transport layer 42 of the R, G, and B unit organic EL layers 44 is not particularly limited.

Then, the layer of the composition for the electron transport layer 42 on which the pattern is formed is subjected to, for example, a heat treatment, and the layer is solidified to form the electron transport layer 42. Thus, the organic EL layer 4 is obtained.

As the apparatus used for the ink jet printing, for example, a type in which a liquid is jetted by driving a piezo element (piezoelectric element), a type in which the liquid is jetted by bubbles generated by heat, and the like are exemplified. .

According to the ink-jet printing, that is, the ink-jet method, fine patterning can be performed easily, quickly, and accurately. In addition, since the adjustment of the film thickness or the area can be easily and accurately performed by increasing or decreasing the discharge amount of the composition, thereby,
It is possible to easily and freely control the shape of the organic EL layer 4, the color development balance, the change in the emission color with respect to the applied voltage, the change in luminance with respect to the applied voltage, and the emission characteristics such as the size.

Therefore, it is possible to easily manufacture the discoloration display device 1 having desired characteristics (for example, uniform color light emission, arbitrary pattern light emission, etc.).

In the present invention, the number of emission colors of the unit organic EL layer 4 is not limited to three, but may be, for example, two or four or more.

In the present invention, the emission color of the unit organic EL layer 4 is not limited to red, green and blue.

On the rear surface of the organic EL layer 4, a layered (flat) cathode 5 is provided. The cathode 5 has a function of receiving electrons from the power supply 9 and giving electrons to the electron transport layer 42. As a constituent material of the cathode 5,
For example, metals (low work function metals) such as aluminum, magnesium, and calcium, or alloys containing these metals and the like are included. The thickness of the cathode 5 is not particularly limited, but is preferably, for example, about 50 to 500 nm.

The front surface 51 of the cathode 5 (the surface of the cathode 5 on the organic EL layer 4 side) 51 preferably has light reflectivity, that is, is preferably a mirror surface. .

The light emitted from the light emitting section 43 is emitted not only on the front side of the discoloration display device 1 but also on the back side. At this time, if the surface 51 of the cathode 5 is a mirror surface, the light emitted toward the back side is reflected by the surface 51, and the reflected light is reflected by the organic EL layer 4, the anode 3, the first The light passes through the substrates 2 and is emitted from the front side of the color change display device 1. For this reason, the brightness of the light emission viewed from the front side of the discoloration display device 1 is increased (almost twice), and effective use of light is achieved.

In addition, when the surface 51 is a mirror surface, the cathode 5 also functions as a light shielding plate. Therefore, it is possible to prevent light from leaking from the rear side of the discoloration display device 1.

When the surface 51 is formed as a mirror surface,
The surface 51 is an extremely smooth surface, and the cathode 5 and the organic EL layer 4
And the adhesiveness with the resin is improved.

The surface 51 of the cathode 5 need not be a mirror surface.

The surface on the back side of the cathode 5 has the second
Substrate 6 is installed. The second substrate 6 is a support member for supporting the cathode 5, and is made of, for example, a plate-like member. The second substrate 6 is made of, for example, a glass material, various ceramic materials, various plastic materials, a resin material such as polycarbonate (PC), or the like. The second substrate 6 is not always necessary when, for example, the cathode 5 is used as a support member.

Next, typically, the discoloration display device 1 is mounted on a predetermined electronic device by the remaining amount of a secondary power supply (secondary battery) that can be repeatedly charged and discharged, that is, the voltage of the secondary power supply (power supply voltage). Is applied to a power supply voltage display device (power supply voltage indicator) that displays.

In this embodiment, the threshold voltage of the R unit organic EL layer 44 of the discoloration display device 1 is VthR, the threshold voltage of the G unit organic EL layer 44 is VthG, and the unit organic E layer B is
When the threshold voltage of the L layer 44 is VthB, VthR
<VthG <VthB and the threshold voltages Vth such that the threshold voltages VthR, VthG and VthB are all within the operating voltage range of the electronic device.
R, VthG and VthB are set respectively.

Further, the power supply voltage of the electronic device is applied between the anode 3 and the cathode 5 of the color changing display device 1 when necessary or always.

FIG. 5 is a graph showing the relationship between the luminance of light emitted from the unit organic EL layer 44 and the voltage applied to the color change display device 1.

As shown in the figure, when the voltage applied to the discoloration display device 1 rises and reaches a threshold voltage (the minimum voltage at which the unit organic EL layer 44 emits light) Vth, the unit organic EL unit 44 emits light.
The layer 44 emits light (turns on). Then, when the applied voltage further increases from the threshold voltage Vth,
Correspondingly, the brightness of the light emitted from the unit organic EL layer 44 increases.

Conversely, as the voltage applied to the color changing display device 1 decreases, the brightness of the light emitted from the unit organic EL layer 44 correspondingly decreases. When the applied voltage is lower than the threshold voltage Vth, the unit organic EL
The light emission of the layer 44 stops (becomes a non-lighting state).

FIGS. 6 and 7 are graphs showing charging / discharging characteristics of secondary power supply (relationship between power supply voltage V and time t).

As shown in FIG. 6, the time t when the power supply voltage V is the threshold voltage VthR of the unit organic EL layer 44 of R is t1, and the threshold voltage VthG of the unit organic EL layer 44 of the power supply V is G. And the time t when the power supply voltage V is the threshold voltage VthB of the unit organic EL layer 44 of B
Is set to t3.

The graph of the power supply voltage during discharging (discharge curve) is as shown in the upper graph in FIG. 7, and the graph of the power supply voltage during charging (charging curve) is as shown in the lower graph in FIG. Become like The directions of the times at the time of discharge and at the time of charge are indicated by arrows in FIG. 6, respectively.

Next, the operation of the color changing display device 1 will be described.

FIGS. 8, 9, 10 and 11 are plan views schematically showing the discoloration display device 1 (viewed from the front side).
It is.

It should be noted that FIGS. 8, 9, 10 and 11
The light emitting unit organic EL layer 44 is indicated by oblique lines.

Since the operation at the time of charging and the operation at the time of discharging are only reversed, the operation at the time of charging will be representatively described below.

As shown in FIG. 6, when V <VthR, the power supply voltage V is applied to the anode 3 and the cathode 5 of the discoloration display device 1.
As shown in FIG. 8, none of the R, G, and B unit organic EL layers 44 emits light.
That is, the organic EL layer 4 is turned off. At this time, the electronic device does not operate.

When V = VthR, the power supply voltage V is applied between the anode 3 and the cathode 5 of the discoloration display device 1, so that, as shown in FIG. Of the EL layers 44, only the R unit organic EL layer 44 emits light. That is, the organic EL layer 4 emits red light.

When VthR ≦ V <VthG,
Since this power supply voltage V is applied between the anode 3 and the cathode 5 of the discoloration display device 1, as shown in FIG. 9, among the R, G and B unit organic EL layers 44, the R unit organic EL layer Layer 4
Only 4 emits light. That is, the organic EL layer 4 emits red light. However, as described above, the brightness of the light emitted from the R unit organic EL layer 44 is higher as the applied voltage is higher. Therefore, when the applied voltage changes, the brightness continuously changes.

The red light emission means that the power supply voltage is approaching a voltage at which the electronic device stops (stop voltage) (stop power display). Further, the lower the luminance of the emitted light, the lower the remaining power of the power source.

Then, when V = VthG, the power supply voltage V is applied between the anode 3 and the cathode 5 of the color change display device 1, and as shown in FIG. Of the EL layers 44, the R and G unit organic EL layers 44 emit light. Thereby, the organic EL layer 4 emits yellow light. In addition, when V = VthG, the unit organic G of E
Since the brightness of the light emitted from the L layer 44 is very low, it emits a color close to red strictly.

When VthG ≦ V <VthB,
Since the power supply voltage V is applied between the anode 3 and the cathode 5 of the color change display device 1, as shown in FIG. The organic EL layer 44 emits light. However, as described above, the brightness of the light emitted from the R and G unit organic EL layers 44 is higher as the applied voltage is higher. Therefore, when the applied voltage changes, the brightness changes continuously in accordance with the change. The emission color of the organic EL layer 4 also changes continuously. In addition,
In the vicinity of V = VthG, the emission color of the organic EL layer 4 changes continuously from red to yellow.

The yellow light emission means that the power supply needs to be charged (charge required display). Also, the closer the emission color is to red, the lower the remaining power of the power source. Further, the lower the luminance of the emitted light, the lower the remaining power of the power source.

Then, when V = VthB, the power supply voltage V is applied between the anode 3 and the cathode 5 of the color change display device 1, and as shown in FIG. All the EL layers 44 emit light. Thereby, the organic EL layer 4 emits white (or blue) light. Note that V
Since the luminance of the light emitted from the B unit organic EL layer 44 when = VthB is very low, the light emits a color close to strictly yellow.

When VthB ≦ V, the power supply voltage V is applied between the anode 3 and the cathode 5 of the discoloration display device 1, and therefore, as shown in FIG. All the organic EL layers 44 emit light. However, as described above, the brightness of the light emitted from the R, G, and B unit organic EL layers 44 is higher as the applied voltage is higher. Therefore, when the applied voltage changes, the brightness continuously changes accordingly. I do. In the vicinity of V = VthB, the emission color of the organic EL layer 4 changes continuously from yellow to white.

The white light emission means that the power supply is in a fully charged state (full charge display). Also, the closer the luminescent color is to yellow, the lower the remaining power is. Further, the lower the luminance of the emitted light, the lower the remaining power of the power source.

Since the operation at the time of charging and the operation at the time of discharging are only reversed, the operation at the time of discharging will be described.
Omitted.

As described above, according to the discoloration display device 1, the remaining amount of the power supply and the degree of charge can be reliably grasped by the multicolor light emission display.

In particular, the change in the emission color indicates the remaining amount of the power supply and the degree of charge, that is, the magnitude of the power supply voltage, so that it is possible to prevent mistaken viewing and it is very easy to see.

Further, since the brightness and the emission color of the light emitted from the color changing display device 1 change continuously, the remaining amount of the power source and the degree of charging can be grasped in detail. Thus, for example, it is possible to reliably grasp that the power supply voltage is approaching the stop voltage, and it is possible to prevent the electronic device from stopping driving due to the decrease in the power supply voltage.

Since the threshold voltages VthR, VthG and VthB are all set within the operating voltage range of the electronic device, the organic EL layer 4 emits light when the power supply voltage decreases until the electronic device stops driving. As a result, it is possible to prevent excessive discharge at a low voltage.

In the discoloration display device 1, detection means (for example, an A / D converter, a comparator, etc.) for detecting a power supply voltage, and control means (for example, an IC, a control And the like in which a table of data used for the above-mentioned is stored) is unnecessary, and a single line of wiring is sufficient despite multi-color light emission. For this reason,
The number of parts is small, the circuit configuration is simple, and it is advantageous for miniaturization (thinning).

Further, since the organic EL layer 4 is used as the light emitting layer, and the organic EL layer 4 emits light at a relatively low voltage, it can be directly driven without providing a separate boosting circuit or the like. Therefore, the number of parts is small, and it is advantageous for miniaturization (thinning).

In the present invention, the discoloration display device 1 is provided with the remaining power of the primary power supply (primary battery) of a predetermined electronic device, ie, 1
The present invention can also be applied to a power supply voltage display device (power supply voltage indicator) that displays the magnitude of the voltage of the next power supply (power supply voltage).

However, in the case of the secondary power supply, it is necessary to check the remaining power more frequently, which is more effective.

Here, examples of the secondary power supply include a secondary battery, a capacitor, a capacitor, and the like.

Examples of the secondary battery include a lithium ion secondary battery, a nickel hydrogen battery, a polymer battery,
Nicad batteries and the like.

Further, the present invention is not limited to a device for displaying the remaining amount of the power supply (power supply voltage display device or charge warning device), but may be a device for displaying the magnitude of a voltage other than the power supply (voltage detection device) or the like. Alternatively, the present invention can be applied to a device that changes a luminescent color by using a change in voltage.

Next, a second embodiment of the color change display device will be described. In the following description, matters that are different from the first embodiment of the discoloration display device will be mainly described, and description of common matters will be omitted.

In this embodiment, the threshold voltage of the R unit organic EL layer 44 of the color change display device 1 is VthR, the threshold voltage of the G unit organic EL layer 44 is VthG, and the unit organic E layer of B is Eth.
When the threshold voltage of the L layer 44 is VthB, VthG
<VthR <VthB and the threshold voltages Vth such that the threshold voltages VthR, VthG and VthB are all within the operating voltage range of the electronic device.
R, VthG and VthB are set respectively.

FIG. 12 is a graph showing charge / discharge characteristics of secondary power supply (relationship between power supply voltage V and time t).

As shown in FIG. 12, time t when power supply voltage V is equal to threshold voltage VthG of unit organic EL layer 44 of G
The time t when the power supply voltage V is the threshold voltage VthR of the unit organic EL layer 44 of R is t2, and the time t when the power supply voltage V is the threshold voltage VthB of the unit organic EL layer 44 of B is t3. And

The directions of the times at the time of discharging and at the time of charging are indicated by arrows in FIG. 12, respectively.

Next, the operation of the color changing display device 1 will be described.

FIG. 13, FIG. 14, FIG. 15 and FIG.
It is a top view (the figure seen from the front side) which shows discoloration display 1 typically.

It should be noted that FIGS. 13, 14, 15, and 1
6, the unit organic EL layer 44 that emits light is indicated by oblique lines.

Since the operation at the time of charging and the operation at the time of discharging are only reversed, the operation at the time of charging will be representatively described below.

As shown in FIG. 12, when V <VthG, the power supply voltage V is applied to the anode 3 and the cathode 5 of the discoloration display device 1.
And R, G, as shown in FIG.
And the unit organic EL layer 44 does not emit light. That is, the organic EL layer 4 is turned off. Also,
At this time, the electronic device does not operate.

Then, when V = VthG, the power supply voltage V is applied between the anode 3 and the cathode 5 of the color changing display device 1, and as shown in FIG. Only the G unit organic EL layer 44 among the EL layers 44 emits light. That is, the organic EL layer 4 emits green light.

When VthG ≦ V <VthR,
Since this power supply voltage V is applied between the anode 3 and the cathode 5 of the color change display device 1, as shown in FIG. 14, among the R, G, and B unit organic EL layers 44, the G unit organic EL layer Only the layer 44 emits light. That is, the organic EL layer 4 emits green light. However, as described above, G unit organic EL
Since the luminance of light emitted from the layer 44 is higher as the applied voltage is higher, when the applied voltage changes, the luminance continuously changes in accordance with the change.

The green light emission means that the power supply voltage is approaching the voltage at which the electronic device stops (stop voltage) (stop power display). Further, the lower the luminance of the emitted light, the lower the remaining power of the power source.

Then, when V = VthR, the power supply voltage V is applied between the anode 3 and the cathode 5 of the color changing display device 1, and as shown in FIG. Of the EL layers 44, the R and G unit organic EL layers 44 emit light. Thereby, the organic EL layer 4 emits orange light. Note that when V = VthR, the luminance of light emitted from the R unit organic EL layer 44 is extremely low, so that the light emits a color close to green strictly.

When VthR ≦ V <VthB,
Since the power supply voltage V is applied between the anode 3 and the cathode 5 of the color change display device 1, as shown in FIG. The organic EL layer 44 emits light. However, as described above, the brightness of the light emitted from the R and G unit organic EL layers 44 is higher as the applied voltage is higher. Therefore, when the applied voltage changes, the brightness changes continuously in accordance with the change. The emission color of the organic EL layer 4 also changes continuously. In addition,
Near V = VthR, the emission color of the organic EL layer 4 changes continuously from green to orange.

The orange light emission means that the power supply needs to be charged (charge required display). Also, the closer the luminescent color is to green, the lower the remaining power of the power source. Further, the lower the luminance of the emitted light, the lower the remaining power of the power source.

Then, when V = VthB, the power supply voltage V is applied between the anode 3 and the cathode 5 of the color changing display device 1, and therefore, as shown in FIG. All the EL layers 44 emit light. Thereby, the organic EL layer 4 emits white (or blue) light. Note that V
Since the luminance of the light emitted from the B unit organic EL layer 44 when = VthB is very low, the light emits strictly orange.

When VthB ≦ V, since the power supply voltage V is applied between the anode 3 and the cathode 5 of the color changing display device 1, as shown in FIG. All the organic EL layers 44 emit light. However, as described above, the brightness of the light emitted from the R, G, and B unit organic EL layers 44 is higher as the applied voltage is higher. Therefore, when the applied voltage changes, the brightness continuously changes accordingly. I do. In the vicinity of V = VthB, the emission color of the organic EL layer 4 changes continuously from orange to white.

The white light emission means that the power supply is fully charged (full charge display). Also, the closer the light emission color is to orange, the lower the remaining power of the power source. Further, the lower the luminance of the emitted light, the lower the remaining power of the power source.

Since the operation at the time of charging and the operation at the time of discharging are only reversed, the operation at the time of discharging will be described.
Omitted.

According to the color change display device 1, the same effects as those of the first embodiment can be obtained.

Next, a third embodiment of the color change display device will be described. In the following description, a description will be given focusing on matters different from the first and second embodiments of the discoloration display device,
Description of common items is omitted.

FIG. 17 is a plan view (viewed from the front side) schematically showing an organic EL layer according to a third embodiment of the color change display device of the present invention.

As shown in the figure, in this embodiment, the organic EL layer 4 includes a plurality of band-shaped R unit organic EL layers 44 and
It is composed of a plurality of band-shaped unit organic EL layers 44 of G and a plurality of band-shaped unit organic EL layers 44 of B.

Each of the unit organic EL layers 44 has a linear shape and is formed to have substantially the same width.

The unit organic EL layers 44 are arranged side by side in FIG. In this case, the unit organic EL of R
Layer 44, unit organic EL layer G and unit organic E layer B
The L layer 44 is arranged in the order of the R unit organic EL layer 44, the G unit organic EL layer 44, and the B unit organic EL layer 44 from left to right in FIG.

Although the width of the unit organic EL layer 44 is not particularly limited, it is preferably, for example, about 10 μm to 1 mm, and more preferably about 50 to 400 μm.

By setting the width of the unit organic EL layer 44 as described above, the overall emission color of the organic EL layer 4 can be made more uniform, thereby further improving the visibility.

According to the color changing display device 1, the same effects as those of the first and second embodiments can be obtained.

In the present embodiment, the unit organic EL layers 44 are formed so as to have substantially the same width. However, the present invention is not limited to this. And the unit organic EL layer 44 of G may be different in width, and the unit organic EL layer 44 of R and the unit organic EL layer of B may be different.
The width of the layer 44 may be different, the width of the G unit organic EL layer 44 and the width of the B unit organic EL layer 44 may be different, and the unit organic EL layer 44 of R and the unit of G may be different. The widths of the organic EL layers 44 and the unit organic EL layers 44 of B may all be different, and the unit organic EL layers 44 of the same emission color may have different widths.

In the present invention, the order of the unit organic EL layers 44 is not limited to the illustrated one.

In the present embodiment, the unit organic EL layer 4
4 is linear, the shape of the unit organic EL layer 44 is not limited to a linear shape as long as it is a belt shape. For example, as shown in FIG. It may be.

In the present invention, the shapes of the unit organic EL layers 44 may be the same or different.

Next, a fourth embodiment of the color change display device will be described. In the following description, a description will be given focusing on matters different from the first and second embodiments of the discoloration display device,
Description of common items is omitted.

FIG. 19 is a longitudinal sectional view schematically showing an organic EL layer according to a fourth embodiment of the color change display device of the present invention.

As shown in the figure, the organic E
The L layer 4 is composed of an R unit organic EL layer 44 and a G unit organic E layer.
An L layer 44 and a B unit organic EL layer 44 are laminated.

The unit organic EL layer of R is formed of the electron transport layer 4
2, the unit organic EL layer 44 of G is composed of the electron transport layer 42, and the unit organic EL layer 44 of B is composed of the hole transport layer 41 and the electron transport layer 42.

In this embodiment, the R unit organic EL layer 4
4, the unit organic EL layer 44 of G, the unit organic EL layer 44 of B, the unit organic EL layer 44 of G, and the unit organic EL layer 44 of G E
Although the layers are arranged in the order of the L layers 44, the present invention is not limited to this order.

According to the color changing display device 1, the same effects as those of the first and second embodiments can be obtained.

Next, a fifth embodiment of the color change display device will be described. In the following description, a description will be given focusing on matters different from the first and second embodiments of the discoloration display device,
Description of common items is omitted.

In the present embodiment, as a constituent material (light emitting material) of the electron transport layer 42 of the organic EL layer 4, a plurality of light emitting materials having different threshold voltages and different emission colors (a plurality of light emitting materials having different emission characteristics) are used. ) Is used.

That is, as a constituent material of the electron transport layer 42, for example, an 8-quinolinol aluminum complex (Al
to q ₃₎ or the like, for example, using the above-mentioned red light-emitting material (fluorescent material), a green light emitting luminescent material (phosphor), and the like that are contained a blue light emitting material (fluorescent material) .

Then, the hole transport layer 41 and the electron transport layer 42 are each formed in a layer shape (flat plate shape).

According to the color changing display device 1, the same effects as those of the first and second embodiments can be obtained.

In this discoloration display device 1, the organic E
Since patterning of the L layer 4 (formation of the unit organic EL layer 44) is not required, manufacturing is easy and productivity is high.

It is needless to say that the unit organic EL layer 44 may be formed as in the first to fourth embodiments, for example.

The color changing display device 1 of each of the above-described embodiments is
Each of them can be used by being incorporated in various electronic devices. It should be understood that each electronic device described below is provided with the discoloration display device 1 of each of the above-described embodiments.

First, an embodiment of an analog wristwatch (portable electronic device) will be described.

FIG. 20 is a longitudinal sectional view schematically showing an embodiment of an analog wristwatch (portable electronic device) provided with the discoloration display device 1 of the present invention, and FIG. 21 is an analog wristwatch shown in FIG. FIG. 22 is a perspective view (including a block diagram) showing a structure of a main part of the analog wristwatch shown in FIG. In FIG. 22, the rotation axes of the second hand 261, the minute hand 262, and the hour hand 263 are actually arranged concentrically.

In the following description, the upper side in FIG. 20 is called “front” and the lower side is called “back”.

As shown in FIG. 20, an analog wristwatch 200, which is an electronic device of the present invention, comprises a wristwatch main body 280,
The watch main body 280 has a watch band (not shown) attached to both ends (left end and right end in FIG. 20).

The watch band is rotatably mounted on the watch main body 280 by a band mounting member (not shown).

The watch main body 280 includes a watch case (not shown) and a time display means (display section) 20 provided therein.
6. Translucent decorative plate 272, discoloration display device 1, watch body 2
09 and the circuit block 208 and the circuit block 208
20 and a transparent cover glass 271 arranged on the upper side (front side) in FIG.

The semi-transmissive decorative plate 272, the discoloration display device 1,
The clock body 209 and the circuit block 208 are arranged in the order of the translucent decorative plate 272, the discoloration display device 1, the clock body 209, and the circuit block 208 from the upper side (front side) to the lower side (back side) in FIG. Are located.

The discoloration display device 1 is installed such that the first substrate 2 is located on the upper side in FIG.

The time display means 206 indicates the second hand 26
1, a minute hand 262 and an hour hand 263, and the rotation axes of the second hand 261, the minute hand 262 and the hour hand 263 are arranged concentrically.

The time display means 206 is arranged above the semi-transmissive decorative plate 272 in FIG. That is,
The discoloration display device 1 is located on the opposite side of the display side of the time display means 206 (lower side in 20). Therefore, the discoloration display device 1 not only displays the remaining amount of the power supply 203, but also functions as a backlight.

Hereinafter, the analog wristwatch 200 will be described in more detail with reference to FIGS. 21 and 22.

As shown in FIGS. 21 and 22, the analog wristwatch 200 has a self-winding type power generating means 204 for generating an AC voltage (AC power), and rectifies the AC voltage from the power generating means 204, and outputs the rectified voltage. (Power), a secondary power supply (power supply) 203 for supplying power to each component, a control unit 201 for controlling the entire analog wristwatch 200,
It has a hand movement mechanism 205 for driving the second hand 261, the minute hand 262 and the hour hand 263 using the stepping motor 210, and a switch 202 for turning on / off the remaining amount display of the power supply 203. When the switch 202 is turned on,
The power supply voltage is directly applied between the anode 3 and the cathode 5 of the discoloration display device 1, and when turned off, the energization is released.

The power generating means 204 has a power generating device 240, a rotary weight 245 and a speed increasing gear 246.

As the power generation device 240, the power generation rotor 2
An electromagnetic induction type AC power generation device is used in which 43 rotates inside the power generation stator 242 and can output power induced in the power generation coil 244 connected to the power generation stator 242 to the outside.

The oscillating weight 245 functions as a means for transmitting kinetic energy to the power generating rotor 243. In other words, the oscillating weight 245 is configured to be able to turn within the apparatus by capturing the movement of the user's arm or the like, and the movement of the oscillating weight 245 is transmitted to the power generation rotor 243 via the speed increasing gear 246. You.

[0209] Therefore, in this analog wristwatch 200, power is generated using energy related to the life of the user, and the power is used to generate power.
Drives.

The hand movement mechanism 205 is
10 and a time display means 206.

[0211] The stepping motor 210 is
The driving coil 211 includes a driving coil 211 that generates a magnetic force by a driving pulse, a stator 212 that is excited by the driving coil 211, and a rotor 213 that rotates by a magnetic field that is excited inside the stator 212.

The stepping motor 210 is a PM (permanent magnet rotating type) motor in which the rotor 213 is formed of a disk-shaped two-pole permanent magnet. The stator 212 is provided with a magnetic saturation portion 217 so that different magnetic poles are generated in the respective phases (poles) 215 and 216 around the rotor 213 by the magnetic force generated by the drive coil 211. In addition, an inner notch 218 is provided at a predetermined position on the inner periphery of the stator 212 to regulate the rotation direction of the rotor 213 so that cogging torque is generated so that the rotor 213 stops at the predetermined position. Has become.

The rotor 213 of the stepping motor 210
Rotation of the fifth wheel & pinion 251, the fourth wheel & pinion 252, the third wheel & pinion 253, and the second wheel & pinion 25 engaged with the rotor 213 through the pinion
4. The second hand 261, the minute hand 262, and the hour hand 26 by the train wheel 250 including the minute wheel 255 and the hour wheel 256.
3 is transmitted. The second hand 261 is on the rotation axis of the fourth wheel & pinion 252.
Are connected, the minute hand 262 is connected to the rotation shaft of the center wheel & pinion 254, and the hour hand 263 is connected to the rotation shaft of the hour wheel 256. In conjunction with the rotation of the rotor 213, the second hand 26
1. The time (time information) is displayed by the minute hand 262 and the hour hand 263. The train train 250 further includes a transmission system (not shown) for displaying the date (date information) and the like.
Of course, it is also possible to connect.

Next, the operation of the analog wristwatch 200 will be described.

As described above, the user sees the second hand 261, the minute hand 262, and the hour hand 263 from the upper side in FIG.

Then, when the switch 202 is turned on, the power supply voltage is applied between the anode 3 and the cathode 5 of the color changing display device 1. As a result, as described above, the organic EL layer 4 of the color change display device 1 emits light at a color and luminance according to the power supply voltage, that is, the remaining amount of the power supply 203. Thus, the user can grasp the remaining amount of the power supply 203.

The organic EL layer 4 serves as a backlight,
In particular, it serves as an illuminating means for illuminating the display unit, and its light emission makes it easy to see the second hand 261, minute hand 262, hour hand 263, and the like. For example, even in a dark place, the second hand 261 and the minute hand 262
The hour hand 263 and the like can be easily seen.

When the switch 202 is turned off, the current is released, and the organic EL layer 4 of the color changing display device 1 is turned off.

As described above, according to the analog wristwatch 200, effects similar to those of the above-described embodiments of the discoloration display device can be obtained.

In the analog wristwatch 200, the discoloration display device 1 has a function of displaying the remaining amount of the power source 203,
Since it has a function as a backlight (in particular, a lighting unit for illuminating the display unit), the number of components can be reduced, and it is advantageous for miniaturization.

Note that the analog wristwatch (A
Q) is an analog wristwatch of a self-winding power generation type provided with a self-winding power generation means and a secondary power supply. However, the present invention is not limited to this type, and for example, a photoelectric conversion type (photovoltaic power generation type) ), A photoelectric conversion type (photovoltaic power generation) analog wristwatch provided with a power generation means and a secondary power supply, a hand-wound power generation analog wristwatch provided with a hand-wound power generation means and a secondary power supply, An analog wristwatch provided with two or more power generation means of a self-winding power generation means, a photoelectric conversion type (photovoltaic power generation) power generation means and a manual winding type power generation means, and a secondary power supply. Is also good. Further, an analog wristwatch having no built-in power generation means, for example, an analog wristwatch having an external charging means may be used.

The electronic device of the present invention has a primary power supply (1).
An analog wristwatch of the (secondary battery) type may be used.

In the present invention, the position of the discoloration display device 1 that illuminates the display unit is not limited to the side opposite to the display side of the display unit, but may be, for example, the side of the display unit.

Next, another embodiment of the analog wristwatch (portable electronic device) will be described. In the following description, matters that are different from the analog wristwatch described above will be mainly described, and descriptions of common matters will be omitted.

FIG. 23 shows another embodiment of an analog wristwatch (portable electronic device) provided with the discoloration display device 1 of the present invention, and is a perspective view (including a block diagram) showing a structure of a main part thereof. ). In FIG. 23, the second hand 26
1. The rotation axes of the minute hand 262 and the hour hand 263 are actually
They are arranged concentrically.

As shown in the figure, the present embodiment is configured to control the driving of the discoloration display device 1 via the control means 201.

According to the analog wristwatch 200, the same effects as those of the above-described analog wristwatch 200 can be obtained, as well as improved usability such as control of lighting time and intermittent lighting, and visual effects.

Next, an embodiment of a digital wristwatch (portable electronic device) will be described.

FIG. 24 is a front view showing an embodiment of a digital wristwatch (portable electronic device) provided with the discoloration display device 1 of the present invention, and FIG. 25 is a schematic view of the digital wristwatch shown in FIG. FIG.

[0230] In the following description, matters different from the above-mentioned analog wristwatch will be mainly described, and description of common matters will be omitted.

In the following description, the upper side in FIG. 25 is called “front”, and the lower side is called “back”.

As shown in these figures, a digital wristwatch 100 which is an electronic device of the present invention has
And watch bands 120, 120 attached to both ends (upper and lower ends in FIG. 24) of the wristwatch main body 110.

The watch bands 120, 120 are respectively
The watch main body 110 is attached by a band attaching member (not shown).
Is mounted to be rotatable.

The watch main body 110 has a substantially rectangular watch case 111 and a movement 112 provided therein.
And a transparent cover glass 115 disposed on the upper side (front side) in FIG.

The movement 112 is the discoloration display 1
, A transflective reflector 136, and a liquid crystal panel (display unit) 1
30; a control circuit (not shown) for driving and controlling the liquid crystal panel 130; a self-winding power generating means (not shown); and a secondary power supply (power supply) (not shown).

The liquid crystal panel 130 has an upper polarizing plate 131, an upper glass 132, a liquid crystal layer 133, a lower glass 134, and a lower polarizing plate 135. These upper polarizing plates 131,
The upper glass 132, the liquid crystal layer 133, the lower glass 134, and the lower polarizing plate 135 are arranged from the upper side (front side) to the lower side (back side) in FIG.
2, the liquid crystal layer 133, the lower glass 134, and the lower polarizer 135 are arranged in this order. Then, the liquid crystal panel 130
Is installed such that the display side (display surface) is on the upper side in FIG.

The discoloration display device 1 is installed on the side opposite to the display side of the liquid crystal panel 130 (lower side in 25) such that the first substrate 2 is on the upper side in FIG. The transflective reflector 136 is provided between the color changing display device 1 and the liquid crystal panel 130.

The color changing display device 1 has both a function of displaying the remaining amount of the power supply and a function as a backlight. Power supply voltage is applied.

Therefore, as described above, the color change display device 1 is changed in color and luminance according to the power supply voltage, that is, the remaining power supply.
The organic EL layer 4 emits light. This allows the user to know the remaining power supply.

Display area 11 on the surface of movement 112
3, various information 114 is displayed. In particular,
Movement 112 includes, in display area 113, morning / afternoon information 114a notifying whether it is morning or afternoon, time information 114b notifying current time, elapsed time, and the like, and whether or not digital wristwatch 100 is in the stopwatch mode. Is displayed as the information 114.

[0241] The information 114 is stored in the movement 11
2 is controlled by a control circuit (not shown).
The control circuit measures and manages information to be displayed as the information 114, and drives and controls the liquid crystal panel 130 based on the measurement and management information. Thereby, predetermined information 114 is displayed in display area 113 of liquid crystal panel 130.

According to the digital wristwatch 100, the same effects as those of the analog wristwatch 200 described above can be obtained.

Note that the digital wristwatch of this embodiment is
The digital wristwatch is a self-winding type digital wristwatch provided with a self-winding type power generation means and a secondary power supply. However, the present invention is not limited to this type, and for example, a photoelectric conversion type (solar power generation type)
A digital wristwatch of a photoelectric conversion type (solar power generation type) provided with a power generation means and a secondary power supply, a digital wristwatch of a hand-wound power generation type provided with a power generation means of a hand-wound type and a secondary power supply,
Two of the automatic winding type power generation means, the photoelectric conversion type (photovoltaic power generation type) power generation means and the manual winding type power generation means
It may be a digital wristwatch provided with one or more power generation means and a secondary power supply. Further, a digital wristwatch having no built-in power generation means, for example, a digital wristwatch having an external charging means may be used.

The electronic device of the present invention has a primary power supply (1).
It may be a digital wristwatch of the secondary battery type.

The electronic device of the present invention may be an analog / digital wristwatch having both an analog section and a digital section.

The electronic device of the present invention may be a portable timepiece other than a wristwatch, for example, a pocket watch, a stopwatch (measurement timepiece), or the like.

The electronic device of the present invention is not limited to a portable clock, but may be a clock that is not suitable for being carried, such as a table clock.

Next, an embodiment of a portable telephone (including a PHS) (portable electronic device) will be described. In the following description, items that are different from the above-described electronic devices will be mainly described, and description of common items will be omitted.

FIG. 26 is a perspective view showing the appearance of an embodiment of a portable telephone (portable electronic device) provided with the discolored display device 1 of the present invention, and FIG. 27 is a schematic view of the portable telephone shown in FIG. FIG.

As shown in these figures, as shown in FIG.
The mobile phone 30 includes a discoloration display device 1, a liquid crystal panel (display unit) 302 for displaying information, and a liquid crystal panel 302.
A control circuit (not shown) for driving and controlling the entire device 1 and a secondary power supply (power supply) 303 such as a lithium-on secondary battery, for example.
And a casing 304 for accommodating them.

The liquid crystal panel 302 is installed such that the display side (display surface) is on the upper side in FIG.

As the liquid crystal panel 302, for example,
A TN (twisted nematic) type liquid crystal, an STN (super twisted nematic) type liquid crystal, a TFT (thin film transistor) type liquid crystal, a TFD (thin film diode) type liquid crystal, or the like can be used.

The discoloration display device 1 is installed on the opposite side (lower side in FIG. 27) of the liquid crystal panel 302 so that the first substrate 2 is on the upper side in FIG.

The color changing display device 1 has a function of displaying the remaining amount of the power source 303 and a function as a backlight. For example, when a power switch (not shown) is turned on, the color changing display device 1 A power supply voltage is applied between the anode 3 and the cathode 5.

Therefore, as described above, the organic EL layer 4 of the color change display device 1 emits light with the power supply voltage, that is, the color and luminance according to the remaining amount of the power supply 303. Thereby, the user can grasp the remaining amount of the power supply 303.

According to the portable telephone 301, the same effects as those of the electronic devices described above can be obtained.

In the present invention, the display section for displaying information is not limited to the liquid crystal panel, and may be, for example, a self-luminous display element if it can transmit light from the color changing display device 1. You may.

Further, the discoloration display device 1 of each embodiment described above can be incorporated in a portable information terminal (for example, a notebook personal computer, a PDA, etc.) and used.

Also in this case, as in each of the electronic devices described above,
The discoloration display device 1 is installed on the opposite side of the display side of a liquid crystal panel (display unit) (not shown) that displays information. Thereby, the discoloration display device 1 displays the remaining amount of power and also functions as a backlight.

According to the portable personal computer provided with the color changing display device 1, the same effects as those of the electronic devices described above can be obtained.

Further, the discoloration display devices 1 of each of the above-described embodiments can be used by incorporating them into audio.

In this case, for example, the discoloration display device 1 of each embodiment described above can be applied to an audio level indicator.

Next, another embodiment of the electronic device of the present invention will be described. In the following description, items that are different from the above-described embodiments will be mainly described, and description of common items will be omitted.

FIG. 28 is a block diagram showing a main part of an embodiment of the electronic device of the present invention.

As shown in FIG. 28, the electronic device 501 of the present embodiment comprises a discoloration display device 1 and a voltage for increasing or decreasing the voltage applied between the anode 3 and the cathode 5 of the discoloration display device 1. Displacement means 502 and secondary power supply (power supply) 503
And a power generation unit 505 composed of power generation means 504.

The voltage displacing means 502 is provided between the color changing display device 1 and the power supply 503. That is, the voltage displacing means 502 causes the power supply 503 to change the color of the discoloration display device 1.
The voltage applied between the anode 3 and the cathode 5 is increased or decreased.

First, a case where the voltage displacing means 502 is used as a step-down means for stepping down a voltage will be described.

FIG. 29 is a graph showing charging / discharging characteristics of power supply 503 (relationship between power supply voltage and time t) and applied voltage corresponding thereto when voltage displacing means 502 is used as step-down means.

As shown in the figure, the power supply voltage is stepped down (shifted downward in FIG. 29) by the voltage displacement means 502,
The voltage is applied to the color change display device 1.

In this case, by changing the step-down ratio of the voltage displacing means 502, the organic EL layer 44 can be changed without changing the light emission characteristics (for example, the threshold voltage and the light emission color of the unit organic EL layer 44). The emission characteristics such as the emission color of the layer 4 can be arbitrarily set.

When the voltage displacing means 502 is used as a step-down means, the voltage displacing means 502 includes, for example, a resistor.

Next, a case where the voltage displacing means 502 is used as a boosting means for boosting a voltage will be described.

FIG. 30 is a graph showing charging / discharging characteristics of power supply 503 (relation between power supply voltage and time t) and applied voltage corresponding thereto when voltage displacing means 502 is used as boosting means.

As shown in the figure, the power supply voltage is boosted (shifted upward in FIG. 30) by the voltage displacement means 502,
The voltage is applied to the color change display device 1.

In this case, by changing the step-up rate of the voltage displacing means 502, the emission characteristics such as the emission color of the organic EL layer 4 can be arbitrarily set without changing the emission characteristics of the unit organic EL layer 44. .

When the voltage displacing means 502 is used as a boosting means, examples of the voltage displacing means 502 include a capacitor and a transformer.

It is needless to say that the power generation unit 505 may be a primary power supply.

According to this embodiment, the same effects as those of the above-described embodiments can be obtained.

In the present embodiment, the voltage displacement means 5
02, the emission characteristics such as the emission color of the organic EL layer 4 can be changed without changing the emission characteristics of the unit organic EL layer 44 (for example, the threshold voltage and emission color of the unit organic EL layer 44). Can be changed. That is, the emission characteristics of the organic EL layer 4 can be easily changed, and
The degree of freedom in setting the light emission characteristics of the L layer 4 increases.

Next, another embodiment of the discolored display device of the present invention and an electronic device having the same will be described.

In the discoloration display device 1 of this embodiment, the anode 3
And at least one of the cathodes 5 is divided into a plurality of regions.

By changing the voltage applied to each area, each area can be made to emit light of a different emission color.

The organic EL layer (light emitting layer) 4 is formed so as to extend between the respective regions.

Hereinafter, a case where the electronic apparatus of the present invention is applied to a digital wristwatch will be described. In addition,
In the following description, matters different from the above-described embodiment shown in FIGS. 24 and 25 will be mainly described, and description of common matters will be omitted.

FIG. 32 is a diagram schematically showing a main part of an embodiment in which the electronic apparatus of the present invention is applied to a digital wristwatch.

As shown in the figure, the discolored display device 1 of this embodiment has a first area 71, a second area 72, and a third area 71.
Region 73.

A first area 71 constitutes a backlight of a portion (mode display section) for displaying a mode of a liquid crystal panel (not shown), and a second area 72 is provided for displaying a day of the liquid crystal panel (day display). ), And the third area 73 constitutes a backlight of a portion (time display section) of the liquid crystal panel that displays the time.

In this embodiment, the cathode 5 of the discoloration display device 1
Is divided into three regions, which constitute the cathodes of the first region 71, the second region 72, and the third region 73, respectively.

The anode 3 is not divided. That is, the anode 3 is formed so as to extend between the respective regions.

The organic EL layer 4 is not divided. That is, the organic EL layer 4 is formed to extend between the respective regions.

Thus, the discolored display device 1 can be easily manufactured.

Power supply section 141 of digital wristwatch 100
Has a power supply (not shown) and control means.

The anode 3 of the discoloration display device 1 has a power supply section 14
1 (not shown) is connected.

On the other hand, the first area 71 of the discoloration display 1
Different negative terminals (not shown) of the power supply unit 141 are connected to the cathodes of the second region 72 and the third region 73, respectively.
Different voltages are applied to the second and third regions 73.

Therefore, the first region 71 emits, for example, red light, the second region 72 emits, for example, yellow light,
The third region 73 emits blue light, for example.

When the power supply voltage changes, the voltages applied to the first region 71, the second region 72, and the third region 73 change accordingly.
The emission colors of the region 71, the second region 72, and the third region 73 change respectively.

According to this embodiment, the same effects as those of the embodiment shown in FIGS. 24 and 25 can be obtained.

In this embodiment, the emission color can be changed for each region. For this reason, it is very easy to see.

In the present invention, the anode 3 may be divided into a plurality of regions, and the cathode 5 may not be divided.

In the present invention, the anode 3 and the cathode 5 may each be divided into a plurality of regions.

In the present invention, the organic EL layer 4 may be divided into a plurality of regions.

Next, another embodiment of the discolored display device of the present invention and an electronic device having the same will be described.

In the discoloration display device 1 of this embodiment, the anode 3
And at least one of the cathodes 5 is divided into a plurality of regions.

By changing the voltage applied to each area, each area can be made to emit light of a different emission color.

Further, the organic EL layer (light emitting layer) 4 is formed so as to extend between the respective regions.

Further, the electronic device of the present embodiment has voltage holding means for holding the voltage applied between the cathode 5 and the anode 3 of the color changing display device 1 substantially constant.

A case where the electronic apparatus of the present invention is applied to a digital wristwatch will be described below with reference to FIG. In the following description, matters different from the embodiment shown in FIG. 32 described above will be mainly described, and description of common matters will be omitted.

The power supply section 141 of the digital wristwatch 100 of the present embodiment includes a power supply (not shown), control means, and voltages applied to the first area 71, the second area 72, and the third area 73, respectively. And voltage holding means for holding the voltage constant.

[0309] Voltages of different magnitudes are applied to the first region 71, the second region 72, and the third region 73.

Therefore, the first region 71 emits red light, for example, the second region 72 emits yellow light, for example.
The third region 73 emits blue light, for example.

According to this embodiment, the same effects as those of the embodiment shown in FIG. 32 can be obtained.

In the present embodiment, since the voltage holding means is provided, the first region 71, the second region 72, and the third region 73 are kept constant even if the power supply voltage changes. Can be emitted in different colors.

Next, another embodiment of the electronic device of the present invention will be described.

[0314] The electronic device of the present embodiment is a discoloration display device 1.
And voltage adjusting means for adjusting the voltage applied between the cathode 5 and the anode 3.

Hereinafter, a case where the electronic apparatus of the present invention is applied to a portable telephone will be described. In the following description, matters different from the above-described embodiment shown in FIGS. 26 and 27 will be mainly described, and description of common matters will be omitted.

FIG. 33 is a plan view schematically showing an embodiment in which the electronic apparatus of the present invention is applied to a mobile phone.

As shown in the figure, the mobile phone 301 of the present embodiment has operation buttons 305 and 306 for adjusting the voltage applied to the discoloration display device 1, and interlocks with these operation buttons 305 and 306. And a circuit (not shown) for changing the voltage applied to the color changing display device 1. Note that this circuit and the operation buttons 305 and 306
A voltage adjusting unit is configured.

When the operation button 305 of the mobile phone 301 is pressed, the voltage applied to the discoloration display device 1 increases, whereby the emission color of the discoloration display device 1 becomes, for example,
It changes to blue.

When the operation button 306 is pressed, the voltage applied to the discoloration display device 1 decreases, whereby the emission color of the discoloration display device 1 changes to, for example, red.

When the power supply voltage changes, the voltage applied to the color changing display device 1 changes accordingly, whereby the emission color of the color changing display device 1 changes.

According to this embodiment, the same effects as those of the embodiment shown in FIGS. 26 and 27 can be obtained.

In this embodiment, when the user operates the operation buttons 305 and 306, the emission color of the discoloration display device 1 can be freely set (adjusted).

Further, there are a wide variety of emission colors that can be set, and a desired color can be set.

Next, another embodiment of the electronic device of the present invention will be described.

[0325] The electronic device of the present embodiment is a discoloration display device 1
And a voltage holding means for holding the voltage applied between the cathode 5 and the anode 3 substantially constant.

A case where the electronic apparatus of the present invention is applied to a portable telephone will be described below with reference to FIG. The following description focuses on matters that are different from the embodiment shown in FIG. 33 described above, and a description of common matters is omitted.

[0327] The mobile phone 301 of the present embodiment has voltage holding means (not shown) for holding the voltage applied to the color changing display device 1 substantially constant.

According to this embodiment, the same effects as those of the embodiment shown in FIG. 33 can be obtained.

Since the present embodiment has the voltage holding means, the color changing display device 1 can emit light of a constant color even if the power supply voltage changes.

The color change display device and the electronic device according to the present invention have been described based on the embodiments. However, the present invention is not limited to these embodiments. It can be replaced with a configuration.

For example, in the present invention, any configurations of the above embodiments may be appropriately combined.

In the embodiment described above, the organic E
The L layer has a form composed of a hole transport layer and an electron transport layer (two-layer type organic EL layer), but in the present invention, the form of the organic EL layer is not limited thereto. For example, a single-layer type organic EL device composed of a bipolar layer having a function of transporting (transmitting) holes and electrons, respectively.
Layer) or a three-layer type (three-layer organic EL)
Layer) or the like.

In the embodiments described above, the organic EL layer is used as the light emitting layer. However, in the present invention, the light emitting layer is
It is not limited to the organic EL layer.

In the above-described discoloration display device of the embodiment, light is emitted from the anode side. However, in the present invention, the cathode is made substantially transparent and light is emitted from the cathode side. Alternatively, light may be emitted from both the anode side and the cathode side.

Further, the electronic device of the present invention may have a plurality of same or different color changing display devices.

The present invention can be applied to, for example, a power supply (battery) fuel gauge, a charge warning device, a voltage detection device, a level indicator of an audio device, and the like.

The present invention also relates to portable watches such as analog watches, digital watches, analog / digital watches, pagers (registered trademark), mobile devices, portable personal computers (notebook personal computers, PDAs, etc.). ),
Mobile phones (including PHS), portable electronic games, electronic organizers, electronic dictionaries, electronic cameras (digital cameras), video cameras, various other monitors, portable videophones, portable wireless devices, and other communication devices, mobile phones The present invention can be applied to all portable electronic devices such as a measuring instrument for use. Furthermore, the present invention can be applied to an electronic device that is not suitable for being carried, such as an audio device and a table clock provided with the above-described level indicator.

[0338]

As described above, according to the present invention, light-emitting display can be performed easily.

For example, when the magnitude of the voltage, the remaining amount of the power supply, and the like are displayed, they are displayed due to the change in the luminescent color.

In addition, there is no need for a detecting means for detecting a voltage, a control means for performing control based on the result, or the like, and a single-system wiring is required despite multicolor light emission. The number of points is small, the circuit configuration is simple, and it is advantageous for miniaturization (thinning).

Further, inexpensive products can be provided to the market.

In the case where an organic electroluminescent layer is used as the light emitting layer, the organic electroluminescent layer emits light at a relatively low voltage, so that it can be directly driven without providing a separate boosting circuit or the like. it can.
For this reason, the number of parts is small, and miniaturization (thinning)
Is advantageous.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view schematically showing a configuration of a first embodiment of a discoloration display device of the present invention.

FIG. 2 is a plan view schematically showing an organic EL layer in the first embodiment of the discoloration display device of the present invention (a view as viewed from the back side).
It is.

FIG. 3 is a plan view (a view from the back side) schematically illustrating another configuration example of the organic EL layer in the first embodiment of the color change display device of the present invention.

FIG. 4 is a diagram illustrating a method for forming an organic EL layer by inkjet printing according to the present invention.

FIG. 5 is a graph showing a relationship between luminance of light emitted from a unit organic EL layer and a voltage applied to a color change display device.

FIG. 6 is a graph showing charge / discharge characteristics (relationship between power supply voltage V and time t) of a secondary power supply.

FIG. 7 is a graph showing charge / discharge characteristics (relationship between power supply voltage V and time t) of a secondary power supply.

FIG. 8 is a plan view (view from the front side) schematically showing the first embodiment of the color change display device of the present invention.

FIG. 9 is a plan view (view from the front side) schematically showing the first embodiment of the color change display device of the present invention.

FIG. 10 is a plan view (view from the front side) schematically showing the first embodiment of the color change display device of the present invention.

FIG. 11 is a plan view (view from the front side) schematically showing the first embodiment of the color change display device of the present invention.

FIG. 12 shows charging / discharging characteristics of a secondary power supply (power supply voltage V and time t).
FIG.

FIG. 13 is a plan view (view from the front side) schematically showing a second embodiment of the color change display device of the present invention.

FIG. 14 is a plan view (a view from the front side) schematically showing a second embodiment of the discoloration display device of the present invention.

FIG. 15 is a plan view (view from the front side) schematically showing a second embodiment of the color change display device of the present invention.

FIG. 16 is a plan view (view from the front side) schematically showing a second embodiment of the color change display device of the present invention.

FIG. 17 is a plan view schematically showing an organic EL layer according to a third embodiment of the color change display device of the present invention (viewed from the front side).

FIG. 18 is a plan view (viewed from the front side) schematically showing a modification of the organic EL layer of the third embodiment of the color change display device of the present invention.

FIG. 19 is a longitudinal sectional view schematically showing an organic EL layer according to a fourth embodiment of the color change display device of the present invention.

FIG. 20 is a longitudinal sectional view schematically showing an embodiment of an analog wristwatch (portable electronic device) provided with the discoloration display device of the present invention.

21 is a block diagram showing a circuit configuration of the analog wristwatch shown in FIG.

22 is a perspective view (including a block diagram) showing a structure of a main part of the analog wrist watch shown in FIG. 20.

FIG. 23 is a perspective view (including a block diagram) showing the structure of a main part of another embodiment of an analog wristwatch (portable electronic device) provided with the discoloration display device of the present invention.

FIG. 24 is a front view showing an embodiment of a digital wristwatch (portable electronic device) provided with the discoloration display device of the present invention.

25 is a vertical sectional view schematically showing the digital wrist watch shown in FIG. 24.

FIG. 26 is a perspective view showing the appearance of an embodiment of a mobile phone (portable electronic device) provided with the discoloration display device of the present invention.

FIG. 27 is a longitudinal sectional view schematically showing the mobile phone shown in FIG. 26.

FIG. 28 is a block diagram illustrating a main part of an electronic device according to an embodiment of the invention.

29 is a graph showing charge / discharge characteristics of a secondary power supply (relationship between power supply voltage and time t) and applied voltage corresponding thereto when the voltage displacement unit of the electronic device shown in FIG. 28 is used as a step-down unit. It is.

30 is a graph showing charge / discharge characteristics of secondary power supply (relationship between power supply voltage and time t) and applied voltage corresponding thereto when voltage displacing means of the electronic device shown in FIG. 28 is used as boosting means. It is.

FIG. 31 is a view for explaining a method of forming an organic EL layer by a vacuum evaporation method in the present invention.

FIG. 32 is a diagram schematically showing a main part of an embodiment in which the electronic device of the invention is applied to a digital wristwatch.

FIG. 33 is a plan view schematically showing an embodiment in which the electronic device of the present invention is applied to a mobile phone.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Color change display apparatus 2 1st board | substrate 3 Anode 4 Organic EL layer (light emitting layer) 41 Hole transport layer 42 Electron transport layer 43 Light emitting part 44 Unit organic EL layer (unit light emitting layer) 45 Mask 451 Opening 5 Cathode 51 Surface 6 Second substrate 71 First area 72 Second area 73 Third area 9 Power supply 100 Digital wrist watch 110 Watch body 111 Watch case 112 Movement 113 Display area 114 information 114a Morning / afternoon information 114b Time information 114c Stopwatch information 115 cover glass 120 band 130 liquid crystal panel 131 upper polarizer 132 upper glass 133 liquid crystal layer 134 lower glass 135 lower polarizer 136 transflective reflector 141 power supply unit 200 type wristwatch 201 control means 202 switch 203 secondary power supply 204 power generation means 205 needle moving machine 206 Time display means 207 Drive means 208 Circuit block 209 Clock body 210 Stepping motor 211 Drive coil 212 Stator 213 Rotor 215, 216 Phase (pole) 217 Magnetic saturation section 218 Inner notch 240 Power generator 242 Power generator stator 243 Power generator rotor 244 Power generation Coil 245 Rotating weight 246 Gear-up gear 250 Wheel train 251 5th wheel 252 4th wheel 253 3rd wheel 254 2nd wheel 255 Day wheel 256 Hour wheel 261 Second hand 262 Minute hand 263 Hour hand 271 Cover glass 272 Semi-transmissive Decorative plate 280 Wristwatch main body 301 Mobile phone 302 Liquid crystal panel 303 Secondary power supply 304 Casing 305, 306 Operation button 401 Inkjet head 402 Nozzle 501 Electronic device 502 Voltage displacement means 503 Secondary Source 504 generating means 505 Power unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H05K 7/12 H05K 7/12 VF term (Reference) 2G016 CA00 CB11 CB12 CC01 CC06 CE00 3K007 AB04 AB18 CA01 CB01 DA01 DB03 EB00 GA01 4E353 AA07 AA16 AA18 BB05 CC01 CC11 CC32 DR01 DR57 GG11 GG19 GG20 5C096 AA01 AA22 AA27 BA04 BB45 BC04 CA06 CB07 CC07 CC21 CC26 DC05 DC29 DD04 FA00

Claims (31)

[Claims] An anode, a cathode, and a light-emitting layer provided between the anode and the cathode, and the light-emitting layer emits light when a voltage is applied between the cathode and the anode. A color change display device, wherein the color of the light emitted from the light emitting layer changes with the change of the voltage. 2. An anode, a cathode, and a light-emitting layer provided between the anode and the cathode, and the light-emitting layer emits light by applying a voltage between the cathode and the anode. A color change display device, wherein the color of the light emitted by the light emitting layer changes with the change of the voltage, and the magnitude of the voltage is displayed by the color of the light emitted. 3. The color changing display device according to claim 1, wherein the light emitting layer is an organic electroluminescent layer. 4. The color changing display device according to claim 1, wherein the light emitting layer includes a plurality of light emitting materials having different light emitting characteristics. 5. The color-change display device according to claim 1, wherein the light-emitting layer has a plurality of light-emitting materials having different threshold voltages, which are minimum voltages for light emission, and different light-emitting colors. 6. The operating voltage of an electronic device provided with the discoloration display device, wherein the threshold voltage is within a range of an operating voltage.
3. The discoloration display device according to 1. 7. The color changing display device according to claim 1, wherein the light emitting layer is constituted by a plurality of unit light emitting layers. 8. The color changing display device according to claim 1, wherein said light emitting layer is constituted by a plurality of unit light emitting layers having different emission colors. 9. The discoloration display device according to claim 7, wherein at least a light emitting portion of the unit light emitting layer is formed in a dot shape. 10. The light emitting portion of at least one of the plurality of unit light emitting layers is arranged in a matrix.
3. The discoloration display device according to 1. 11. The light-emitting portion of at least one of the unit light-emitting layers is formed in a belt shape.
3. The discoloration display device according to 1. 12. The color changing display device according to claim 1, wherein the light emitting layer is formed by stacking a plurality of unit light emitting layers. 13. The color changing display device according to claim 1, wherein the light emitting layer is formed by stacking a plurality of unit light emitting layers having different emission colors. 14. The color changing display device according to claim 1, wherein the light emitting layer includes a material obtained by mixing a plurality of light emitting materials having different light emitting characteristics. 15. The light-emitting layer according to claim 1, wherein the light-emitting layer is made of a mixture of a plurality of light-emitting materials having different threshold voltages, which are minimum voltages for light emission, and different emission colors. Discoloration display device. 16. The color changing display device according to claim 15, wherein the threshold voltage is within a range of an operating voltage of an electronic device provided with the color changing display device. 17. The voltage applied between the cathode and the anode is a voltage of a power supply of an electronic device provided with the discoloration display device, and a luminescent color of the light emitting layer indicates a remaining amount of the power supply. The discoloration display device according to claim 1. 18. The color change display device according to claim 1, wherein the color change display device is configured to be capable of continuously changing the emission color of the light emitting layer. 19. The light emitting device according to claim 1, wherein a luminance of light emitted from said light emitting layer changes with a change in a voltage applied between said cathode and said anode.
A discoloration display device according to any one of the above. 20. The color changing display device according to claim 19, wherein the color changing display device is configured to be able to continuously change the luminance. 21. An anode, a cathode, and a light emitting layer provided between the anode and the cathode, and the light emitting layer emits light by applying a voltage between the cathode and the anode. A color changing display device, wherein at least one of the anode and the cathode is divided into a plurality of regions, and by changing an applied voltage to each of the regions, each of the regions can emit light of a different emission color. A discoloration display device, characterized in that: 22. The color changing display device according to claim 21, wherein the light emitting layer is formed so as to extend between the respective regions. 23. The color-change display device according to claim 21, wherein a color of light emitted from the light-emitting layer changes with a change in the voltage. 24. The color changing display device according to claim 21, wherein the light emitting layer is an organic electroluminescence layer. 25. An electronic device comprising the discoloration display device according to claim 1. 26. The electronic device according to claim 25, wherein the electronic device is a portable electronic device. 27. The electronic device according to claim 25, wherein the electronic device has a display unit for displaying information, and the discoloration display device is provided on a side opposite to a display side of the display unit. 28. The electronic device according to claim 25, wherein the electronic device has a display unit for displaying information, and the discoloration display device has a function of illuminating the display unit. 29. The electronic device according to claim 25, further comprising a voltage displacing means for increasing or decreasing a voltage applied between said cathode and said anode. 30. The electronic device according to claim 25, further comprising voltage holding means for holding a voltage applied between said cathode and said anode substantially constant. 31. The electronic device according to claim 25, further comprising a voltage adjusting unit that adjusts a voltage applied between the cathode and the anode.