JPS595849Y2 - electro-optic display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device using an electro-optical element, and more particularly to a light-lit electro-optic display device.

Conventional light-lit electric display devices have a light switching element outside the display device or a photoconductive layer on the entire surface of the display device, and the light switching device or the photoconductive layer is irradiated with light. It is configured to be electrically conductive and display an optical image.

The former, which uses optical switching elements, increases the number of parts for both devices and circuits, takes time and effort to manufacture, and cannot be called a compact device, and the latter, which has a photoconductive layer,
There was a drawback that an image could not be displayed unless the optical signal itself was converted into an image.

The present invention has been devised in view of the above-mentioned drawbacks, and embodiments thereof will be described below with reference to the drawings.

FIG. 1 shows a first embodiment, in which 1a and lb are two electrode substrates, at least one of which is transparent, and 2 is an electro-optic display material supported between them.

Reference numerals 3a' and 3a are electrodes provided on one of the substrates 1a, each having an output terminal, and an electrode for displaying an image, and 4 is a photoconductive layer provided on the substrate 1a, connecting the electrodes 3a' and 31. be.

3b is a transparent electrode provided on the other substrate 1b, and 5 is this transparent electrode 3b and an electrode 3a' having an extraction terminal.
This is the power supply connected between the two.

Since the first embodiment has the above structure, the photoconductive layer 4
When irradiated with light, it becomes conductive and the voltage of the power source 5 is applied between the electrodes 3a and 3b of both substrates 1a and lb, allowing an image to be displayed.

Since the image is displayed using light irradiation, it can be remotely controlled and displayed only when it is bright, such as when sunlight is shining on it, and it can also be used as an accessory for a target game.

Further, since no switch is required in the connection circuit of the power source 5, there are advantages such as a very small size.

FIG. 2 shows a second embodiment, and in the first embodiment shown in FIG. This is a case where the electrode 3a is laminated, and the end of the other electrode 3a is further laminated thereon.

When constructed in this way, in addition to the effects of the first embodiment, the photoconductive layer 4 can be made thinner, allowing for highly sensitive optical switching, and the light irradiation position only needs to be a laminated portion.
The gap between the electrodes 3a and 3a' shown in FIG. 1 can be widened, and the permissible position for light irradiation can be widened.

Figures 3A, B, and C are respectively 3rd. 4, 5
In the first embodiment shown in FIG. 1, a light-shielding material 3-1. This is a case where 3-2 and 3-3 are laminated, and 3-1 may be conductive, but 3-2 and 3-3 are insulating.

FIG. 4 shows the second embodiment of FIG. 2, in which the end of the electrode 3a laminated on the photoconductive layer 4 is made of another conductive material 3', connecting the photoconductive layer 4 and the electrode 3a. This is the case.

In the case of FIGS. 3A, B, and C and when 3' is made of a light-shielding material, the incident direction of the switching light is directed to the lower substrate 1a by the material 3-1.3-2.3-3.3'. (In this case, it is a transparent electrode substrate.) If the material 3-1.3-2.3-3.3' is a reflective material, the light efficiency will be improved.

In particular, if a metal evaporated layer or the like is used as the conductive material 3', the light efficiency will be improved by reflection, and when the photoconductive layer 4 is conductive, the electrode 3a
It also has the role of electrically communicating between the photoconductive layer 4 and the conductive material 3'.

The laminated portions in the figure can be interchanged vertically and horizontally as long as the semiconducting layer is sandwiched between the electrodes.

In addition, as the photoconductive layer 4 in the present invention, zinc oxide,
Zinc sulfide, cadmium sulfide, gallium arsenide, and other semiconductors can be used.

It goes without saying that the present invention can be widely applied to liquid crystal display devices, electrochromic displays, electrophoretic displays, dipole fluid displays, dielectric field display devices using ferroelectric optical elements, and the like.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the first embodiment of the present invention, Fig. 2 is a sectional view showing the second embodiment, Figs. 3 A, B, C, and 4.
The figures are shown in Figure 3. 4. FIG. 7 is a cross-sectional view showing a fifth embodiment and a sixth embodiment. la, lb...electrode substrate, 2...electro-optic display material, 3a'...electrode having an extraction terminal, 3a...electrode for displaying an image , 4...
...Photoconductive layer.

Claims (1)

[Scope of utility model registration request] In an electro-optic display device in which an electro-optic display material is sandwiched between two electrode substrates, at least one of which is transparent, an electrode having a take-out terminal and an electrode for displaying an image are connected on at least one of the substrates. An electro-optical display device comprising a photoconductive layer.