JP2005174754A - EL light emitting display device - Google Patents

Abstract

An EL light-emitting display device capable of color display and having a light emission shape that can be easily changed is provided.
An EL light emitting layer having an EL light emitting body, an electrode portion disposed on one surface side of the EL light emitting layer, and the EL light emitting layer disposed on the other surface side of the EL light emitting layer by applying an AC power supply voltage. An EL light emitting display device including a conductive layer for forming an alternating electric field therein, wherein the EL light emitting layer is configured by arranging a set of light emitting layers having different emission colors from each other, and the electrode portion is the EL A plurality of terminals are arranged side by side on the light emitting layer side, and color light emission is performed by controlling voltages applied to the plurality of terminals.
[Selection] Figure 4

Description

  The present invention relates to an EL light emitting display device.

Electroluminescence (Electro Luminescence; hereinafter referred to as “EL”) is known as one of the light emitting materials, and as an EL light emitting sheet, an electrode portion in which an electrode set of a first electrode and a second electrode is formed in a comb shape, A structure in which an insulating layer and a light emitting layer are sequentially laminated is known. In this EL light emitting sheet, a portion of the light emitting layer on which the display electrode is formed emits light by forming and drying a conductive material having an arbitrary shape on the light emitting layer to form a display electrode. . According to this EL light emitting sheet, a display electrode having a shape according to the user's preference can be formed, and a desired light emitting shape can be obtained.
JP-A-8-153582

However, in the case of the EL light emitting sheet of Patent Document 1, since the material of the EL light emitting layer is the same over the entire area, the light emitting color of the EL light emitting layer itself when the AC electric field is formed in the EL light emitting layer is the same, As long as the color of the display electrode formed on the light emitting layer is a single color, the light emission color has to be monotonous. In addition, an electrode set of the first electrode and the second electrode existing immediately below the EL light emitting layer is formed in a comb shape, and a display electrode is formed on the light emitting layer in a fixed manner. Since the AC power supply voltage is applied to the second electrode, there is a problem that only the light emission shape corresponding to the formed display electrode can be obtained.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an EL light emitting display device that can perform color display and can easily change the light emission shape.

  The EL light emitting display device according to claim 1 is an EL light emitting layer having an EL light emitter, an electrode portion disposed on one surface side of the EL light emitting layer, and an AC power source disposed on the other surface side of the EL light emitting layer. An EL light emitting display device comprising a conductive layer for forming an alternating electric field in the EL light emitting layer by applying a voltage, wherein the EL light emitting layer is configured by arranging a set of light emitting layers having different emission colors from each other. The electrode unit is configured by arranging a plurality of terminals on the EL light emitting layer side, and is configured to emit color light by controlling a voltage applied to the plurality of terminals. .

  The EL light emitting display device according to claim 2, wherein an EL light emitting layer having an EL light emitter, an electrode portion disposed on one surface side of the EL light emitting layer, and an AC power source disposed on the other surface side of the EL light emitting layer. An EL light emitting display device comprising a conductive layer for forming an alternating electric field in the EL light emitting layer by applying a voltage, wherein a set of filters having different colors is provided between the EL light emitting layer and the conductive layer. Are arranged in parallel, and the electrode part is configured by arranging a large number of terminals on the EL light emitting layer side, and is configured to emit color light by controlling the voltage applied to the large number of terminals. Features.

  The EL light emitting display device according to claim 3 is the EL light emitting display device according to claim 1 or 2, wherein the conductive layer is configured to be detachable by a conductive sheet.

  According to the EL light emitting display device according to claim 1, the EL light emitting layer is configured by arranging a set of light emitting layers having different emission colors from each other, and the electrode portion has a large number of terminals arranged on the EL light emitting layer side. Because it is configured to emit color light by controlling the voltage applied to many terminals, color display is possible by controlling the voltage applied to many terminals, and light emission The shape can be easily changed.

  According to the EL light emitting display device according to claim 2, a set of filters of different colors are arranged in parallel between the EL light emitting layer and the conductive layer, and the electrode portion has a large number of terminals arranged on the EL light emitting layer side. Since it is configured to emit color light by controlling the voltage applied to a large number of terminals, it is possible to perform color display by controlling the voltage applied to the large number of terminals. The light emission shape can be easily changed.

  According to the EL light emitting display device according to claim 3, the conductive layer is configured to be detachable by the conductive sheet. You can get the shape.

  FIG. 1 shows a sign board as an example of an EL light emitting display device. The sign board 1 incorporates an EL light emitting sheet 10 (see FIG. 2). The sign board 1 is configured to display an arbitrary light emitting shape on the EL light emitting sheet 10. The detailed configuration of the sign board 1 will be described below.

(Detailed configuration)
1. EL Light Emitting Sheet (1) Configuration of EL Light Emitting Sheet As shown in FIG. 2, the EL light emitting sheet 10 includes a base layer 11, an electrode part (electrode layer) 12, a waterproof layer 13, a light reflecting layer 14, an EL light emitting layer 15, and The conductive layers 16 are sequentially stacked. Among these, the waterproof layer 13, the light reflecting layer 14, the EL light emitting layer 15, and the conductive layer 16 are formed by silk screen printing or the like.

(2) Detailed configuration of EL light emitting sheet 1) Base layer The base layer 11 is made of an insulating material such as PET (polyethylene terephthalate). The base layer 11 may be configured as a base film (base material sheet). In that case, the base film is made of a transparent or opaque synthetic resin. In this case, for example, PET is used as the synthetic resin. The base layer may be made of glass.

2) Electrode part The electrode part (electrode layer) 12 is attached to the multilayer substrate. FIG. 3A is an enlarged plan view of the main part of the electrode unit 12 as viewed from the EL light emitting layer side, and FIG.
The electrode unit 12 electrically connects the plurality of first potential lines 120 extending in the first direction, the plurality of second potential lines 130 extending in the second direction, and the first potential line 120 or the second potential line 130. A plurality of terminals 140 connected to each other are provided.
Here, the plurality of first potential lines 120 are composed of potential lines 121, 122, 123, 124, etc., which extend in parallel with each other and can be independently controlled as shown in FIG. . The plurality of second potential lines 130 are composed of potential lines 131, 132, 133, 134, etc., which extend in parallel with each other and can be independently controlled in potential, as shown in FIG. In the figure, black circles are terminals connected to the first potential line 120, and white circles are terminals connected to the second potential line 130. For example, the terminals 1212 and 1214 are terminals electrically connected to the potential line 121, and the terminals 1311 and 1313 are potential lines electrically connected to the potential line 131.

3) Waterproof layer (undercoat layer)
The waterproof layer 13 is a layer for protecting the electrode part 12 and is made of a synthetic resin. Synthetic resins include, for example, fluorocarbon resins such as tetrafluoroethylene resin and fluororubber, silicone resins such as silicone rubber, other epoxy resins, acrylic resins, urethane resins, polyester resins, and ethylene vinyl acetate Combined or other highly sealing resin is used. These resins are cured by methods such as UV curing, IR curing, two-component curing, and heat curing.
Specifically, when an ink composition containing a polyester resin as a resin component (for example, polyester ink EX-2211 Clear E01 (manufactured by Mino Group)) is used as a layer forming material, the ink composition is a ketone. Dilute with a system solvent to make an ink for silk screen printing. Using this ink, a film is formed by silk screen printing and dried. Thereby, the waterproof layer 13 is obtained.

4) Light reflecting layer (dielectric layer)
The light reflecting layer 14 preferably has a thickness of about 10 to 30 μm, a withstand voltage of about 200 to 300 V, a dielectric constant of about 30 to 100, and more preferably a dielectric constant of about 60 to 100.
The light reflecting layer 14 is configured by dispersing inorganic powder, which is a ferroelectric powder such as barium titanate or Rochelle salt, in a resin that functions as a binder such as an acrylic resin. Since the inorganic powder such as the ferroelectric powder is a pigment exhibiting white, the light reflection layer 14 is white and effectively exhibits the light reflection function.
As a specific example, the light reflecting layer 14 is made of barium titanate and a fluorine resin. These are diluted with a solvent to obtain an ink for silk screen printing, and the light reflecting layer 14 is formed by performing film formation and drying by silk screen printing.

5) EL light emitting layer The EL light emitting layer 15 is formed by arranging a set of light emitting layers having different emission colors. The EL light emitting layer 15 is not particularly limited, but is configured by adding impurities for light emission to the ZN thin film. Examples of emission colors are blue, green and yellow-orange. In the case of blue, Cu and I are added as impurities. In the case of green, Cu and Al are added. In the case of yellow-orange, Cu and Mn are added as impurities. To do. An example is shown in FIG. 15a is a blue light emitting layer, 15b is a green light emitting layer, and 15c is a yellow-orange light emitting layer. Such a set of strip-shaped light emitting layers is provided side by side.

6) Conductive layer As the conductive layer 16, for example, a conductive seal for forming an alternating electric field is used. As the conductive seal for forming an alternating electric field, for example, one having a size that covers the entire surface of the EL light emitting layer 15 is used. Alternatively, the conductive layer 16 may be formed on the entire surface of the EL light emitting layer 15 by silk screen printing.

(3) Circuit Configuration FIG. 5 is a control block diagram of the sign board 1. Reference numeral 20 denotes a control device, and an operation program of the sign board 1 is built in the control device 20. Further, a reading device 21 is connected to the control device 20, and light emission data stored in an external storage medium (FD, MD, etc.) can be read. The light emission data in this case includes light emission shape data, light emission color data, and light emission format data. Among these, “light emission shape data” is code data for displaying shapes such as pictures, photographs, characters, figures and symbols. “Light emission color data” is code data indicating the color of the light emission shape. Further, “light emission format data” is code data indicating a light emission format such as scrolling or stationary light emission.
Instead of reading the light emission data stored in the external storage medium, the light emission data may be input from the input device instead of or in addition thereto.

  In this control device 20, when the light emission data is read from the external storage medium, the control device 20 processes the light emission data according to the operation program, and the control device 20 outputs a control signal corresponding to the light emission data to the X driver and the Y driver. Is done. The AC voltage applied to the first potential line 120 and the second potential line 130 is controlled by the X driver and the Y driver.

In this case, for example, when the first potential line 122 is selected as the potential line to which the first voltage is applied and the second potential line 132 is selected as the potential line to which the second voltage is applied, the terminals 1221 and 1223 are connected to the first voltage. The terminal 1322 becomes the potential of the second voltage, and the potential difference between the terminal 1221 and the terminal 1322 and the potential difference between the terminal 1223 and the terminal 1322 are just above the region 150 surrounded by the one-dot chain line in FIG. The EL light emitting layer portion emits light with a predetermined color. That is, the EL light emitting layer portion immediately above the region 150 emits light in any one of blue, green, yellow orange, or a combination thereof depending on how the AC voltage is applied.
Note that it is preferable to apply a third voltage to a potential line to which the first voltage and the second voltage are not applied so that an unnecessary portion does not emit light.

As mentioned above, although an example of embodiment of this invention was demonstrated, this invention is not limited to the said form, A various deformation | transformation is possible.
For example, in the above-described embodiment, the EL light emitting layer is configured by arranging a set of light emitting layers having different emission colors. It is good also as setting up. Alternatively, the electrode unit 12 may be configured so that individual terminals can be selected and voltage controlled.

It is a top view of the sign board to which EL light emitting display apparatus is applied. It is a partial enlarged view of the principal part cross section of EL light emission sheet. It is a schematic plan view showing a part of electrode layer. It is a figure which shows an electrode pattern. It is a control block diagram.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 EL light emission display apparatus 10 EL light emission sheet 12 Electrode part 13 Waterproof layer 14 Light reflection layer 15 EL light emission layer 16 Conductive layer

Claims (3)

  An EL light-emitting layer having an EL light-emitting body, an electrode portion disposed on one surface side of the EL light-emitting layer, and an AC electric field in the EL light-emitting layer disposed on the other surface side of the EL light-emitting layer by application of an AC power supply voltage An EL light emitting display device comprising a conductive layer for forming a light emitting layer, wherein the EL light emitting layer is formed by arranging a set of light emitting layers having different emission colors from each other, and the electrode portion is disposed on the EL light emitting layer side. 2. An EL light emitting display device comprising a plurality of terminals arranged side by side and configured to emit color light by controlling a voltage applied to the plurality of terminals.   An EL light-emitting layer having an EL light-emitting body, an electrode portion disposed on one surface side of the EL light-emitting layer, and an AC electric field in the EL light-emitting layer disposed on the other surface side of the EL light-emitting layer by application of an AC power supply voltage An EL light-emitting display device comprising a conductive layer for forming a plurality of filters, wherein a set of filters having different colors are arranged in parallel between the EL light-emitting layer and the conductive layer, and the electrode portion is configured to emit the EL light. 2. An EL light emitting display device comprising a plurality of terminals arranged side by side on a layer side and configured to emit color light by controlling a voltage applied to the plurality of terminals.   The EL light-emitting display device according to claim 1, wherein the conductive layer is configured to be detachable by a conductive sheet.

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