JPS6167082A - Display panel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a display panel that displays information on a glossy panel surface according to an information input drive.

[Background of the invention]

As an example of such a display channel, a display 14 channel using liquid crystal cells is shown in FIG. In the figure, 1 indicates a liquid crystal cell, and 2 indicates an upper information input cell. The upper information input cell 2 has a lower electrode substrate 4 having an electrode 3 on the upper surface and an upper electrode substrate 6 having an electrode 5 on the lower surface, which are arranged with a space 7 between them, and both substrates are bonded together with an adhesive 8. It is connected. The I/C on the lower electrode substrate 4 is a dot spacer 9
is formed. The arrangement of the adhesive 8 and dot spacers 9 on the substrate 4 is shown in FIG.

The above-mentioned display panel has a complicated structure and requires swiping of the liquid crystal cell portion. Further, the drive electrodes, that is, the electrodes 5 on the upper electrode substrate 6 must also be arranged in a matrix shape. Moreover, there is also the drawback that the display section cannot be driven unless the information in the upper information input cell is output to the outside.

In order to eliminate the drawbacks of display panels using such liquid crystal cells, the present invention provides a display panel incorporating an electrochromic element that utilizes an electrochemical coloring/decoloring phenomenon, that is, an electrochromic phenomenon. This is what we are trying to provide. electrochromi,
The element can be applied to, for example, a numeric display element, an X-Y matrix display, an optical shutter, an aperture mechanism, etc., and can be classified into liquid type and solid type based on the material, but the present invention is particularly applicable to all solid type. The present invention aims to provide a display/mother panel with a built-in electrochromic element.

Two structural examples of all-solid-state electrochromic elements utilizing the electrochromic phenomenon are shown in FIGS. 7 and 8. These figures show the general structure of an all-solid-state electrochromic device.

The electrochromic element shown in FIG. 7 has a first electrode 12 made of a transparent conductive film on a transparent substrate 11, an electrochromic layer 13 which is a coloring layer on the anode side, and an insulating layer made of a dielectric film. 14. The second electrode 15 made of a conductive film is sequentially laminated. The electrochromic element shown in FIG. 8 further includes a second electrochromic layer 16, which is a coloring layer on the cathode side, between the insulating layer 14 and the second electrode 15 in the structure shown in FIG. It is a layered product.

In the above structure, the substrate 11 is generally formed of a glass plate, but this is not limited to a glass plate, and may be any colorless and transparent plate such as a glass plate or an acrylic plate.
Also, regarding its position, it may be located above the second electrode 15 instead of under the first electrode 12, or depending on the purpose (
For example, they may be provided on both sides (for the purpose of providing a protective cover, etc.).

However, depending on these cases, it is necessary to use a transparent conductive film for the second electrode 15 or to use transparent conductive films for both electrodes. If both electrodes are transparent electrodes, a transparent element can be created. The insulating layer 14 may be made of not only a dielectric but also a solid electrolyte or the like.

As the transparent conductive film, an ITO film (indium InO doped with tin oxide S n02), a NESA film, or the like is used. Conventionally, the electrochromic layer 13, which is the coloring layer on the anode side, is made of chromium dioxide (CR2O,).
, iridium hydroxide (Ir(OH)2), hydroxide, chelate (Nx(oH)2), etc.

The insulation 1114 made of dielectric material is made of zircon dioxide (Zr
O□), tantalum pentoxide (Ta205), silicon oxide (
810, 8102), lithium fluoride (LIF), magnesium fluoride (Mg
It is formed using a fluoride such as F2). In addition, the electrochromic layer 16, which is the coloring layer on the cathode side, is made of tungsten oxide (WO□, WO3), molybdenum oxide (Mo022M0O3), vanadium pentoxide (v20
5) etc.

In an all-solid-state electrochromic element having such a structure, an electrochemical reaction occurs when a voltage is applied between the first electrode 12 and the second electrode 150, and the element is colored or decolored.

This coloring mechanism is, for example, the electrochromic layer 16
It is generally said that bronze formation is caused by a double injector of cations and electrons. For example, when WO3 is used as an electrochromic substance, an oxidation-reduction reaction represented by the following formula (1) occurs, resulting in coloration.

WO3+ xH+ xe +HxWO3 (1) (1) 2: Therefore, tungsten bronze Hxwo3 is formed and colored, but if the applied voltage is reversed here, it becomes a decolored state. In an all-solid-state electrochromic device, such a reaction of formula (1) causes coloration due to the supply of protons H+ by an insulating layer inside the device.

In the above-mentioned electrochromic element, conventionally, the electrochromic layer 13, which is the coloring layer on the anode side, is formed using a hydroxide such as iridium hydroxide (Ir(OH)2) using a reactive scorching method or an anodic oxidation film method. It is formed by

[Object of the Invention] The object of the present invention is to eliminate the disadvantages of the conventional display motherboard using a liquid crystal cell as described above, to have a simple structure,
Moreover, it is an object of the present invention to provide a display panel in which the space in the panel portion only needs to be an information input space, and the driving method is only to utilize information input driving.

Another object of the present invention is to provide a display panel which has advantages such as being of much better quality than those using liquid crystals, being able to read displays such as characters even in dim light, and having no viewing angle. The goal is to provide the necessary information.

[Summary of the invention]

The display panel according to the present invention is an electrochromic element in which a first coloring layer, an insulating layer, and a second coloring layer are sequentially laminated on a transparent outer lower electrode substrate having a transparent electrode on the upper surface. , a transparent electrode layer is laminated thereon, a flexible upper electrode substrate is placed on top of these layers with a space between them, and the above two coloring layers, an insulating layer and a conductive film layer are applied to each pixel. The pixel is formed separately into two pixels, and a spacer is provided between each pixel.

[Embodiments of the invention]

The basic structure of a display panel according to the present invention is shown in FIG. As shown in the figure, a transparent electrode 22 is disposed on a transparent lower electrode substrate 21 made of glass or the like, and as shown in FIG. An electrochromic element 23 is formed by sequentially laminating the second coloring layer 23e of the reduction side coloring layer,
A transparent conductive film layer 24 is laminated thereon. Second coloring layer 2
The transparent conductive film layer 24 formed on the layer 3c has a low resistance, preferably a resistance of 20Ω/hole or more.

Next, a 7-lexible upper electrode substrate 27 having an electrode 26 on its lower surface is placed across the space 25. In order to connect the lower electrode substrate 21 and the upper electrode substrate with a space between them, a spacer/adhesive 28 is formed around the substrates, thereby connecting the upper and lower substrates.

The two coloring layers of the electrochromic element 23, that is, the oxidized coloring layer 23&, the reduced coloring layer 23a, the insulating layer 23b, and the conductive film layer 24 are formed separately for each pixel, and a spacer 29 is provided between each pixel. is provided.

The upper electrode substrate 27 of Tsukuneru, which has the electrochromic element built in, is in a flexible state.
For example, if pressure is applied downward by some method from above the upper electrode substrate 27, the upper electrode 26 and the upper part of the electrochromic element 23 including the conductive film layer 24 come into contact and color develops. When decoloring, a reverse voltage may be applied and contact may be made in the same manner as described above.

When pressure is applied to the upper electrode substrate 27, the unnecessary portion Kt
A spacer 29 is installed inside the panel to prevent & from touching, and this spacer is preferably transparent if possible.

Next, one embodiment of the present invention will be described.

IT on one side of the transparent glass substrate 6crrL x 6α
A transparent electrode consisting of O (transmittance 85 cm, resistance value 10 Ω)
, a film thickness of 2000X) is formed, and a white adhesive (SE-1700) is applied and cured on the opposite side to produce an electrode substrate.

Dot spacers are formed on this substrate by screen printing.

The screen printing method for Y and spacers was as follows. Drill a number of dragon holes with a diameter of 0.05 on a metal plate with a thickness of 0.1H, use it as a screen plate, screen print with W curable ink (e.g. Loctite 350) and harden it to a height of 2.
A dot spacer with a diameter of about 0 μm and a diameter of about 0.1 fi is obtained.

Next, using the 1-reactive Snow 4-Tree method, a thin plate of metal Ir was used as a targut, and a gas of H2:0□=1:2 was introduced.
'5 Apply a high frequency of W/C112, and apply 300% of FA as the first coloring layer! Formed. Next 1.
A T1205 film was formed at 3000X as an i8 edge layer, and a WO5 film was formed at 4000X as a second coloring layer by vacuum evaporation using an electron gun. Furthermore, an ITO film was formed as a transparent conductive film layer on these films by an ion pre-tinting method. Its resistance was 20Ω/mouth. After forming these films, adhesive is printed around the lower electrode substrate in order to bond the upper side with the electrode substrate. This adhesive has a spacer (e.g. Micro Pearl φ40) to create a space between the substrates.
μm).

After screen printing this adhesive (Example 5E-1700),
After pasting the upper electrode substrate together, heating it at 150°C for 30 minutes will heat up the display panel.

A voltage of 1.5V is applied between the upper and lower electrodes of the display constructed in this way, with the upper side as the cathode and the lower side as the anode, and when you press the upper board with your finger and trace letters, etc., the trajectory of your finger will appear. A similar professional status display has appeared.

This display is on a white background and has very good visibility.

When erasing, a voltage can be applied in reverse and the displayed area can be traced, or the upper electrode can be applied to an electrochromic element containing a conductive layer by some method.

FIG. 4 shows an example of an ion brating device used when manufacturing the above-mentioned display panel. In the figure, 30 is an electron gun (EB gun), 31 is a substrate holder,
32 indicates a high frequency coil.

〔Effect of the invention〕

As mentioned above, in the display panel according to the present invention, the configuration is simple, and the space in the panel part only needs to be an information input space, and in addition, the drive method may also be an information input drive. You can get the benefits of being able to do it.

In addition, the quality is much better than that of conventional liquid crystal displays, so you can read text even in dim light.
Moreover, there is no perspective. Further, since the two coloring layers, the insulating layer, and the conductive film layer of the electrochromic element are formed separately for each pixel, there is no need to arrange the drive electrodes in a matrix.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the basic structure of a display panel according to the present invention, and FIG. 2 is an enlarged view of a part thereof.
FIG. 3 is a plan view showing the structure of the electrochromic element and conductive film on the lower electrode substrate and the arrangement of spacers; FIG. 4 is a schematic diagram of the ion blating device used in manufacturing the display panel; Figure 5 is a cross-sectional view of a display panel using a conventional liquid crystal/4-channel panel.
FIG. 6 is a plan view showing the arrangement of the spacers on the lower electrode substrate shown in FIG. 5, and FIGS. 7 and 8 are cross-sectional views showing two examples of the structure of the electrochromic element. 1・・・Liquid crystal cell ゛ 2・-・Upper information input cell 3
...Electrode 4...Lower electrode substrate 5...
'WL pole, 6... Upper electrode substrate, 7...
space, 8...adhesive, 9...p,) spacer, 11...substrate, 12...electrode, 13...electrochromic layer, 14...insulating layer, 15-...・Electrode, 16...
- Electrochromic layer, 21... Lower electrode substrate, 22-... Transparent electrode, 23-
... Electrochromic element, 24 ... Transparent conductive film layer, 25 ... Space, 26 ... Electrode, 27
... Upper electrode substrate, 28 ... Adhesive, 29
...Spacer, 30...Electron gun, 31...
- Substrate holder, 32...high frequency coil. Figure 1 I Figure 2 Figure 3 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] An electrochromic element consisting of a first coloring layer, an insulating layer, and a second coloring layer laminated in sequence is provided on a transparent lower electrode substrate with a transparent electrode on the upper surface, and a transparent conductive film is placed on top of the electrochromic element. The layers are laminated, a flexible upper electrode substrate is placed on top of these layers with a space between them, and the above two coloring layers,
An insulating layer and a conductive film layer are formed separately for each pixel,
A display panel characterized in that a spacer is provided between each pixel.