JP2003015121A - Liquid crystal display and electronic equipment - Google Patents

Abstract

[PROBLEMS] To provide a transflective liquid crystal display device capable of obtaining a desired color purity even in a transmissive mode. SOLUTION: The liquid crystal display device 1 of the present invention has an opening 12 for light transmission on the inner surface side of a lower substrate 2, a segment electrode 10 functioning as a transflective film is provided, and the outer surface side of the lower substrate 2 Is a transflective liquid crystal display device provided with a backlight 27. Between the lower substrate 2 and the backlight 27, a hologram sheet 29 for dispersing light from the backlight 27 into color lights having different wavelengths in a predetermined spectral direction.
Is provided. The shape of the light transmission opening 12 is set so as to satisfy b / a <1, where a is a dimension perpendicular to the spectral direction and b is a dimension parallel to the spectral direction. I have.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device and electronic equipment, and more particularly to a transflective liquid crystal display device having a light source having a spectral function.

[0002]

2. Description of the Related Art Reflective liquid crystal display devices have low power consumption because they do not have a light source such as a backlight, and have been widely used in various portable electronic devices and display units attached to devices. However, the reflection type liquid crystal display device has a problem that it is difficult to visually recognize the display in a dark place because the display is performed by using external light such as natural light or illumination light.
Therefore, there has been proposed a liquid crystal display device in which outside light is used in a bright place like a normal reflection type liquid crystal display device, and in a dark place a display can be visually recognized by an internal light source. In other words, this liquid crystal display device employs a display system that has both a reflective type and a transmissive type, and the power consumption can be reduced by switching the display mode to either the reflective mode or the transmissive mode according to the ambient brightness. While reducing the number, it is possible to perform a clear display even when the surroundings are dark. Hereinafter, in this specification, this type of liquid crystal display device is referred to as a “semi-transmissive reflective liquid crystal display device”.

As a form of the transflective liquid crystal display device,
A reflective film having a slit (opening) for light transmission formed on a metal film such as aluminum is referred to as an inner surface of the lower substrate (hereinafter, in this specification, a surface of the substrate on the liquid crystal side is an inner surface, and a surface opposite to the outer surface is an outer surface). Therefore, a liquid crystal display device in which this reflective film functions as a semi-transmissive reflective film has been proposed. In this liquid crystal display device, by providing a metal film on the inner surface of the lower substrate, the influence of parallax due to the thickness of the lower substrate is prevented,
In particular, the structure using color filters has the effect of preventing color mixing.

FIG. 10 shows an example of a passive matrix type transflective liquid crystal display device using this type of transflective film. In this liquid crystal display device 100, a liquid crystal 103 is sandwiched between a pair of transparent substrates 101 and 102, a striped segment electrode 104 is formed on the lower substrate 101, and an alignment film 105 is formed so as to cover the segment electrode 104. Has been formed. On the other hand, R (red), G (green), and B (blue) dye layers 106 are formed on the upper substrate 102.
A color filter 108 having r, 106g, 106b and a black matrix 107 is formed, a flattening film 109 is stacked on the color filter 108, and IT is formed on the flattening film 109.
A common electrode 110 made of a transparent conductive film such as O is formed in a stripe shape in a direction orthogonal to the segment electrode 104, and the alignment film 11 covers the common electrode 110.
1 is formed.

The segment electrode 104 is formed of a metal film having a high light reflectance such as aluminum, and a slit 112 for transmitting light is formed for each pixel. Since the segment electrode 104 made of a metal film is provided with the slit 112, the segment electrode 104 functions as a semi-transmissive reflective film. An upper polarizing plate 113 is arranged on the outer surface side of the upper substrate 102, and a lower polarizing plate 114 is arranged on the outer surface side of the lower substrate 101. Also, backlight 1
15 (illuminator) is the lower surface of the lower substrate 101, the lower polarizing plate 1
It is arranged further below 14.

When the liquid crystal display device 100 shown in FIG. 10 is used in a reflective mode in a bright place, external light such as sunlight or illumination light incident from above the upper substrate 102 is reflected by the liquid crystal 10.
3 and then is reflected by the surface of the segment electrode 104 on the lower substrate 101, and then again passes through the liquid crystal 103.
It is emitted to the 02 side. Further, when used in the transmission mode in a dark place, the light emitted from the backlight 115 installed below the lower substrate 101 passes through the segment electrode 104 at the slit 112, and then the liquid crystal 103.
And is emitted to the upper substrate 102 side. These lights contribute to the display in each of the reflection mode and the transmission mode.

[0007]

However, the transflective liquid crystal display device having the transflective film as described above has the following problems. That is, in the reflective mode, the light reflected by the part other than the slit of the semi-transmissive reflective film contributes to the display, and in the transmissive mode, the light transmitted by the part of the slit of the semi-transmissive reflective film contributes to the display. The brightness balance of the display in each mode is determined by the opening area of the slit. For example, when it is important to obtain a bright display in the reflection mode, the aperture area cannot be made too large, and on the contrary, the display in the transmission mode becomes dark.

Therefore, the designer of the liquid crystal display device determines the opening area of the slit to a predetermined size in consideration of the balance of the brightness of the reflective mode and the transmissive mode.
It was difficult to balance the color purity of the display in the reflective mode and the transmissive mode. This is because in the reflective mode, the light passes through the color filter twice before and after the reflection, but in the transmissive mode, the light passes through the same color filter as in the reflective mode only once. Therefore, for example, if the color purity of the color filter itself is designed so as to obtain a desired color purity in the reflection mode, a lighter color display than the desired color purity will be displayed in the transmission mode.

The present invention has been made in order to solve the above-mentioned problems, and in a transflective liquid crystal display device provided with a transflective film having a light transmitting opening, even in a transmissive mode. An object of the present invention is to provide a liquid crystal display device capable of obtaining a desired color purity.

[0010]

In order to achieve the above object, in a liquid crystal display device of the present invention, a liquid crystal is sandwiched between an upper substrate and a lower substrate which are arranged to face each other, and an inner surface of the lower substrate is provided. A transflective liquid crystal display device, in which a transflective film is provided on the side and an illuminating device is provided on the outer surface side of the lower substrate to perform display by switching between a transmissive mode and a reflective mode. The film is provided with a quadrangular light-transmitting opening for transmitting light emitted from the illuminating device in the transmission mode, and is emitted from the illuminating device between the lower substrate and the illuminating device. The light-transmitting opening is provided with a spectroscopic means for spectroscopically separating the light into colored light having different wavelengths in a predetermined spectroscopic direction, and the shape of the light transmission opening is a in a direction perpendicular to the spectroscopic direction and is parallel to the spectroscopic direction. The dimension in the direction is b Occasionally, characterized in that it is set to satisfy the b / a <1.

The present inventor uses a transflective liquid crystal display device provided with a transflective film having an opening for transmitting light, in order to improve the color purity of a transmissive mode from a lighting device (backlight). For the transmission of light after adopting a structure equipped with a spectroscopic means that splits the emitted light into colored light with different wavelengths, such as red light, green light, and blue light, and makes it enter the corresponding pixel of the liquid crystal cell. I thought about devising the shape of the opening.

Generally, the spectroscopic means has a predetermined spectroscopic direction according to its configuration, and the light from the illuminating device has a spectrum in which the intensity distribution of color light having different wavelengths appears along the spectroscopic direction of the spectroscopic means. Is split into. Therefore,
For example, after designing so that the peak position of the intensity distribution of red, green, and blue light after spectral distribution and the center position of the light transmission opening of the pixel corresponding to each color display match, the intensity of each color light Color purity can be improved by using only light in the vicinity of the central wavelength where the distribution has a peak, for display. For that purpose, if the opening area of the light transmitting opening is determined to be a predetermined value, its shape may be designed to be short in the direction parallel to the spectral direction and long in the direction perpendicular to the spectral direction. . That is, the dimension of the light transmitting opening perpendicular to the spectral direction is a, and the dimension parallel to the spectral direction is b.
In such a case, it may be designed to satisfy b / a <1.

Specifically, a hologram or a diffraction grating can be used as the spectroscopic means. Further, the spectroscopic means may be provided separately from the lighting device, or the lighting device itself may have a spectral function. By using such a spectroscopic unit, the configuration of the present invention can be realized relatively easily.

Further, a condensing means for condensing the light emitted from the spectroscopic means to the light transmitting opening may be provided between the lower substrate and the spectroscopic means. According to this structure, the light emitted from the spectroscopic means can be efficiently transmitted through the light transmission opening and contribute to the display in the transmission mode. Further, by optimizing the design of the light collecting means, the position of the peak of the intensity distribution of each color light and the center position of the light transmission opening of the pixel corresponding to each color display can be sufficiently matched.

Specifically, a microlens array can be used as the light converging means. According to this configuration,
By optimizing the shape of each microlens forming the microlens array, the light dispersed by the spectroscopic means can be reliably focused on the light transmission opening.

An electronic apparatus of the present invention is characterized by including the liquid crystal display device of the present invention. According to this configuration,
In particular, it is possible to realize an electronic device having a liquid crystal display section having excellent display quality in the transmission mode.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION [First Embodiment] A first embodiment of the present invention will be described below with reference to FIGS.
The liquid crystal display device of the present embodiment is an example of a passive matrix type transflective liquid crystal display device. FIG. 1 is a plan view showing the overall configuration of the liquid crystal display device, and FIG. 2 is an enlarged view of the display area. FIG. 3 is a plan view, FIG. 3 is a cross-sectional view taken along the line AA ′ of FIG. 2, and FIG. 4 is a view for explaining the operation and effect of the present embodiment. In addition, in the following drawings, in order to make the drawings easy to see, ratios of dimensions, film thicknesses, and the like of respective constituent members are appropriately changed.

As shown in FIG. 1, the liquid crystal display device 1 of the present embodiment has a lower substrate 2 (one substrate) which is rectangular in plan view.
And the upper substrate 3 (the other substrate) are arranged to face each other with the sealing material 4 interposed therebetween. A part of the sealing material 4 is opened on one side (upper side in FIG. 1) of each of the substrates 2 and 3 to form a liquid crystal inlet 5, and inside the space surrounded by both the substrates 2 and 3 and the sealing material 4. The liquid crystal is sealed in, and the liquid crystal inlet 5 is sealed by the sealing material 6. A vertical conduction material such as anisotropic conductive particles is mixed in the sealing material 4, and functions as a vertical conduction portion in addition to the function of liquid crystal sealing.

In the present embodiment, the outer dimension of the lower substrate 2 is larger than that of the upper substrate 3, and the peripheral portion of the lower substrate 2 is located from the three sides (the right side, the left side and the lower side in FIG. 1) of the upper substrate 3. It is overhanging. Further, a driving semiconductor element 7 for driving the electrodes of both the upper substrate 3 and the lower substrate 2 is mounted on the end portion on the lower side of the lower substrate 2. Reference numeral 8 is a light-shielding layer (peripheral parting) for shielding the periphery of the effective display area,
An area inside the inner edge of the rectangular ring-shaped light shielding layer 8 is an effective display area that contributes to actual image display.

In the case of the present embodiment, as shown in FIGS. 1 and 2, a plurality of segment electrodes 10 (signal electrodes) extending in the vertical direction in the drawing are formed in stripes on the lower substrate 2. There is. On the other hand, on the upper substrate 3, the segment electrode 1
A plurality of common electrodes 11 (scanning electrodes) extending in the horizontal direction in the drawing so as to be orthogonal to 0 are formed in stripes. R, G, B dye layers 13 of the color filter 13
r, 13g, and 13b are arranged corresponding to the direction of each segment electrode 10 (vertical stripes / R, G, and B are arranged vertically in the same color in stripes), and are arranged in the horizontal direction shown in FIG. One dot on the screen is composed of three R, G, and B pixels arranged side by side.

The segment electrode 10 is formed of a metal film having a high light reflectance such as aluminum. In order to make the segment electrode 10 function as a semi-transmissive reflective film, as shown in FIG. One light transmission opening 12 is provided for each pixel. Light transmission opening 1
2 is formed vertically in the approximate center of the vertically long pixel in FIG. The “pixel” referred to here is each area in which the segment electrode 10 and the common electrode 11 are overlapped with each other in plan view, as shown in FIG.

As shown in FIG. 1, the common electrode routing wiring 1 extends from the end of each common electrode 11 to the sealing material 4.
4a is extended. Of the plurality of common electrodes 11 (only 10 are shown in FIG. 1), the common electrode 11 of the upper half (5 in FIG. 1) of FIG.
The common electrode wiring 14a is drawn out from the right end of the common electrode wiring 14a, and the common electrode wiring 14b (hereinafter, It is electrically connected to the routing wire 14). Similarly, for the lower half of the common electrode 11 (five in FIG. 1) in FIG. 1, the common electrode wiring 14a is drawn out from the left end of the common electrode 11, and the upper and lower conducting members in the sealing material 4 are interposed. And is electrically connected to the lead wiring 14b on the lower substrate 2. The routing wirings 14 b on the lower substrate 2 are bent and extend along the left and right sides of the lower substrate 2, and are connected to the output terminals of the driving semiconductor element 7.

On the other hand, with respect to the segment electrode 10, the segment electrode wiring 15 (hereinafter simply referred to as the wiring 15) is drawn out from the lower end of the segment electrode 10 toward the sealing material 4, and the driving semiconductor element 7 is kept as it is. Is connected to the output terminal of. Further, an input wiring 16 for supplying various signals to the driving semiconductor element 7 is provided from the lower side of the lower substrate 2 toward an input terminal (not shown) of the driving semiconductor element 7.

Looking at the sectional structure of the pixel portion, as shown in FIG. 3, the segment electrode 10 made of a metal film having a light transmitting opening 12 on the inner surface of the lower substrate 2 made of a transparent substrate such as glass or plastic. Are formed in a stripe shape in a direction penetrating the paper surface, and an alignment film 20 made of, for example, polyimide whose surface is rubbed is formed thereon.

On the other hand, the R, G, B dye layers 13 are formed on the inner surface of the upper substrate 3 made of a transparent substrate such as glass or plastic.
A color filter 13 composed of r, 13g, 13b and a black stripe 17 is formed. In the case of the present embodiment, since each color light that has been spectrally dispersed enters the corresponding pixel as described later, a color filter is not required in the transmission mode, but a color filter is required for display in the reflection mode. Becomes Color filter 13
An overcoat film 21 is formed on the upper surface of the overcoat film 21 for flattening the step between the dye layers and protecting the surface of each dye layer. The overcoat film 21 may be a resin film such as acryl or polyimide, or an inorganic film such as a silicon oxide film. Furthermore, the IT is formed on the overcoat film 21.
A common electrode 11 made of a single layer film of O is formed in a stripe shape in a direction parallel to the paper surface, and an alignment film 22 made of, for example, polyimide whose surface is rubbed is formed on the common electrode 11.

Between the upper substrate 3 and the lower substrate 2, STN (Su
A liquid crystal 23 such as a per Twisted Nematic liquid crystal is sandwiched. An upper polarizing plate 24 is arranged on the outer surface of the upper substrate 3, and a lower polarizing plate 25 is arranged on the outer surface of the lower substrate 2. A liquid crystal cell 26 is configured by the upper substrate 3 and the lower substrate 2 that sandwich the liquid crystal 23, and the upper and lower polarizing plates 24 and 25.

A backlight 27 (illumination device) is arranged on the outer surface side of the lower substrate 2 of the liquid crystal cell 26. In the case of this embodiment, the backlight 27 itself has a light source (not shown) including a cold cathode tube and a light guide plate 28 that guides light from the light source and emits the light toward the liquid crystal cell 26. The hologram sheet 29 (spectroscopic means) is attached to the upper surface of the light guide plate 28. The hologram sheet 29 splits white light incident from one surface side (backlight side) into red, green, and blue color lights, and diffracts each color light at different angles to the other surface side (liquid crystal cell side). Each of them emits light.

Hologram sheet 29 of backlight 27
The microlens array 30 is provided between the liquid crystal cell 26 and the liquid crystal cell 26.
(Condensing means) is provided. In the case of this embodiment,
Each microlens 31 forming the microlens array 30 is arranged over three pixels adjacent to each other in the extending direction of the common electrode 11 (horizontal direction in FIG. 3),
The respective color lights separated by the hologram sheet 29 are sequentially transmitted through the lower polarizing plate 25 and the lower substrate 2 and then the segment electrode 10
The light is focused on the light transmission opening 12 of the (semi-transmissive reflective film).
At this time, red light is focused on a pixel corresponding to red display, green light is focused on a pixel corresponding to green display, and blue light is focused on a pixel corresponding to blue display.

The hologram sheet 29 has a spectral direction in one direction when viewed in plan. In the cross-sectional view of FIG. 3, the extending direction of the common electrode 11 (the direction parallel to the paper surface) is the spectral direction, and the light from the backlight 27 is spectrally dispersed in this direction, but the extending direction of the segment electrode 10 is. The light is not split in the direction (direction perpendicular to the paper surface). In the plan view of FIG. 2, the horizontal direction is the spectral direction, and the segment electrode 10
The light transmission opening 12 formed in the (semi-transmissive reflection film)
The shape is short in the direction parallel to the spectral direction and long in the direction perpendicular to the spectral direction. That is, the light transmission opening 12
The relationship of b / a <1 is satisfied, where a is the dimension in the direction perpendicular to the spectral direction and b is the dimension in the direction parallel to the spectral direction.

As an example of dimensions, the segment electrode 10
When the pixel pitch on the side (horizontal direction in FIG. 2) is 80 μm and the pixel pitch on the common electrode 11 side (vertical direction in FIG. 2) is 240 μm, the dimension of the light transmission opening 12 in the direction perpendicular to the spectral direction. a is 160 μm, and the dimension b in the direction parallel to the spectral direction is 10 μm. Preferably b / a
<0.2 is recommended.

In the liquid crystal display device 1 of this embodiment, the backlight 27 is provided with the hologram sheet 29, and has the predetermined spectral direction (horizontal direction in FIG. 3) as described above. Therefore, the backlight 2
As shown in FIG. 4 (a), the light emitted from 7 is split so as to have a spectrum in which the intensity distributions Kr, Kg, and Kb of the color lights having different wavelengths appear along the spectral direction of the hologram sheet 29. Therefore, as shown in FIG. 4B, the back position is adjusted so that the positions of the peaks of the intensity distributions of the red light, the green light, and the blue light coincide with the center positions of the light transmission openings 12 of the pixels corresponding to each color display. After designing the emission direction of the light 27 and the shape of the microlens 31, as shown in FIG. 4C, the shape of the light transmission opening 12 is short in the direction parallel to the spectral direction and perpendicular to the spectral direction. It is set to be longer in all directions.

In this structure, although each color light is condensed by the microlens array 30 in the light transmission opening 12, the skirt portion of the intensity distribution of each color light is located outside the light transmission opening 12. It has a tail. Therefore, only the central wavelength at which the intensity distribution of each color light has a peak, for example, near 610 nm for red light, near 545 nm for green light, and near 480 nm for blue light can pass through the light transmission opening 12 and contribute to the display. Therefore, for example, the color purity of the display color can be increased as compared with the case where the shape of the light transmission opening 12 is designed to be long in the direction parallel to the spectral direction and short in the direction perpendicular to the spectral direction. In the present embodiment, as an example of the dimensions of the light transmission opening 12, the dimension a in the direction perpendicular to the spectral direction is 160 μm and the dimension b in the direction parallel to the spectral direction is 10 μm. Even if there is, for example, the dimension a in the direction perpendicular to the spectral direction is 40 μm,
The color purity can be greatly improved as compared with the case where the dimension b in the direction parallel to the spectral direction is 40 μm.

In the case of the present embodiment, the liquid crystal cell 26
Between the hologram sheet 29 and the hologram sheet 29
Since the microlens array 30 that collects the light dispersed by the light transmission opening portion 12 is provided, the light emitted from the hologram sheet 29 is efficiently transmitted to the light transmission opening portion 12 and the It can contribute to the display. Further, by optimizing the design of each microlens 31, the peak position of the intensity distribution of each color light and the center position of the light transmission opening 12 of the pixel corresponding to each color display can be appropriately matched. In addition, the color purity is improved and the brightness can be increased as compared with the case without the microlens array.

[Second Embodiment] The second embodiment of the present invention will be described below.
The embodiment will be described with reference to FIG. In the present embodiment, the entire configuration of the liquid crystal display device is the same as that of the first embodiment shown in FIG.
Since it is the same as the embodiment described above, detailed description will be omitted. The difference from the first embodiment is only that the light collecting means is not provided. This part will be described with reference to FIG. FIG. 5 shows the liquid crystal display device of the present embodiment taken along the line AA ′ of FIG.
FIG. 4 is a sectional view corresponding to a line (corresponding to FIG. 3 of the first embodiment). In FIG. 5, the same components as those in FIG. 3 are designated by the same reference numerals.

While the microlens array is provided between the liquid crystal cell and the hologram sheet in the first embodiment, in the liquid crystal display device 50 of the present embodiment, the liquid crystal cell 26 and the hologram sheet 29. No microlens array is provided between and. Therefore, the respective colored lights split by the hologram sheet 29 remain in the direction in which they are emitted from the hologram sheet 29,
The light passes through the lower substrate 2 and reaches the light transmission opening 12. As described above, the microlens array is not provided, but the shape of the light transmission opening 12 is the same as that of the first embodiment, and is short in the direction parallel to the spectral direction and perpendicular to the spectral direction. It has a long shape. That is, when the dimension of the light transmitting opening 12 in the direction perpendicular to the spectral direction is a and the dimension in the direction parallel to the spectral direction is b, b / a <1
Meet the relationship.

Also in the present embodiment, for example, the color purity of the display color is improved as compared with the case where the shape of the light transmission opening 12 is designed to be long in the direction parallel to the spectral direction and short in the direction perpendicular to the spectral direction. It is possible to obtain the same effect as that of the first embodiment.

[Third Embodiment] The third embodiment of the present invention will be described below.
The embodiment will be described with reference to FIG. In the present embodiment, the entire configuration of the liquid crystal display device is the same as that of the first embodiment shown in FIG.
Since the third embodiment is similar to the second embodiment, detailed description thereof will be omitted. In particular, the difference from the second embodiment is only the configuration of the backlight, and this portion will be described with reference to FIG. 6 is a cross-sectional view (corresponding to FIG. 3 of the first embodiment and FIG. 5 of the second embodiment) corresponding to the line AA ′ in FIG. 2 of the liquid crystal display device of the present embodiment. . In FIG. 6, the same components as those in FIGS. 3 and 5 are designated by the same reference numerals.

In the first and second embodiments, the backlight provided with the light source on the side of the light guide plate is used, whereas in the liquid crystal display device 60 of the present embodiment, the light guide plate 28 is used. A backlight 62 having a point light source 61 on its lower surface is used. The point light source 61 is, for example, the light guide plate 2
The organic electroluminescence element, the light emitting diode, or the like may be formed on one surface side of 8, and white light is emitted. The hologram sheet 29 is attached to the upper surface of the light guide plate 28 as in the first and second embodiments.

The respective color lights emitted from the point light source 61 and separated by the hologram sheet 29 are transmitted through the lower polarizing plate 25 and the lower substrate 2 in the same direction as they are emitted from the hologram sheet 29, and the light transmission opening 12 is formed. To reach. In the case of the third embodiment also, the microlens array is not provided, but the shape of the light transmission opening 12 is the same as that of the first embodiment, and it is short in the direction parallel to the spectral direction. The shape is long in the direction perpendicular to the direction. That is, when the dimension of the light transmitting opening 12 in the direction perpendicular to the spectral direction is a and the dimension in the direction parallel to the spectral direction is b, b / a <1
Meet the relationship.

Also in the present embodiment, for example, the color purity of the display color is improved as compared with the case where the shape of the light transmission opening 12 is designed to be long in the direction parallel to the spectral direction and short in the direction perpendicular to the spectral direction. It is possible to obtain the same effect as the first and second embodiments.

[Electronic Equipment] Examples of electronic equipment provided with the liquid crystal display device of the above embodiment will be described. FIG. 7 is a perspective view showing an example of a mobile phone. In FIG. 7, reference numeral 1000 indicates a mobile phone main body, and reference numeral 1001 indicates a liquid crystal display section using the above liquid crystal display device.

FIG. 8 is a perspective view showing an example of a wrist watch type electronic device. In FIG. 8, reference numeral 1100 indicates a watch body, and reference numeral 1101 indicates a liquid crystal display unit using the above liquid crystal display device.

FIG. 9 is a perspective view showing an example of a portable information processing device such as a word processor and a personal computer. In FIG. 9, reference numeral 1200 is an information processing apparatus, reference numeral 1202 is an input unit such as a keyboard, reference numeral 1204 is an information processing apparatus main body, and reference numeral 1206 is a liquid crystal display unit using the above liquid crystal display device.

Since the electronic equipment shown in FIGS. 7 to 9 is equipped with the liquid crystal display section using the liquid crystal display device of the above-mentioned embodiment, the display in the transmission mode and the reflection mode is well balanced,
In particular, it is possible to realize an electronic device having a liquid crystal display section having excellent color purity in the transmission mode.

The technical scope of the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, an example in which the hologram sheet attached to the upper surface of the backlight is used as the spectroscopic means has been described, but a diffraction grating or the like may be used. Alternatively, the backlight itself may have a spectral function instead of the mode in which the spectral means is installed in the backlight. In addition, although a configuration example in which the segment electrode also serves as the semi-transmissive reflective film is described, a semi-transmissive reflective film may be provided separately from the segment electrode. The present invention may be applied not only to the passive matrix type liquid crystal display device but also to the active matrix type liquid crystal display device. In addition, the specific description regarding the shape, dimensions, and the like of each component of the liquid crystal display device is not limited to the above-described embodiment, and can be appropriately changed.

[0046]

As described above in detail, according to the present invention, it is possible to improve the color purity of the display in the transmissive mode in the transflective liquid crystal display device, and the display quality is excellent. A liquid crystal display device can be realized.

[Brief description of drawings]

FIG. 1 is a plan view showing an overall configuration of a liquid crystal display device common to first to third embodiments of the present invention.

FIG. 2 is an enlarged plan view of a display area of the liquid crystal display device.

FIG. 3 is a diagram showing the liquid crystal display device of the first embodiment and is a cross-sectional view taken along the line AA ′ of FIG. 2.

FIG. 4 is a diagram for explaining the function and effect of the liquid crystal display device.

5 is a diagram showing a liquid crystal display device according to a second embodiment and is a cross-sectional view taken along the line AA ′ of FIG.

6 is a diagram showing a liquid crystal display device according to a third embodiment and is a cross-sectional view taken along the line AA ′ of FIG.

FIG. 7 is a perspective view showing an example of an electronic device of the present invention.

FIG. 8 is a perspective view showing another example of the electronic device of the same.

FIG. 9 is a perspective view showing still another example of the electronic device.

FIG. 10 is a plan view showing an example of a conventional liquid crystal display device.

[Explanation of symbols] 1,50,60 Liquid crystal display 2 Lower substrate 3 Upper substrate 10 segment electrodes (semi-transmissive reflective film) 11 common electrode 12 Light transmission opening 23 LCD 27 Backlight (illuminator) 29 Hologram sheet (spectroscopic means) 30 microlens array (light collecting means)

Claims (6)

[Claims] 1. A liquid crystal is sandwiched between an upper substrate and a lower substrate which are arranged to face each other, a semi-transmissive reflective film is provided on the inner surface side of the lower substrate, and an illuminating device is provided on the outer surface side of the lower substrate. A transflective liquid crystal display device that performs display by switching between a transmissive mode and a reflective mode, wherein the transflective film has a rectangular shape for transmitting light emitted from the illumination device in the transmissive mode. A light-transmitting opening having a shape is provided, and a spectroscopic unit that disperses light emitted from the illuminating device into color lights having different wavelengths in a predetermined spectral direction is provided between the lower substrate and the illuminating device. ,
The shape of the light transmission opening is set so as to satisfy b / a <1 when the dimension in the direction perpendicular to the spectral direction is a and the dimension in the direction parallel to the spectral direction is b. A liquid crystal display device characterized in that 2. The liquid crystal display device according to claim 1, wherein the spectroscopic unit comprises a hologram. 3. The liquid crystal display device according to claim 1, wherein the spectroscopic unit comprises a diffraction grating. 4. Between the lower substrate and the spectroscopic means,
4. The liquid crystal display device according to claim 1, further comprising a condensing unit that condenses the light emitted from the spectroscopic unit on the light transmitting opening. 5. The liquid crystal display device according to claim 4, wherein the condensing unit is a microlens array. 6. An electronic apparatus comprising the liquid crystal display device according to claim 1. Description: