JPS6215519A - display device - Google Patents

Abstract

PURPOSE:To record, display, hold, and rewrite information directly and to requires almost no electric power for all functions them by forming a transparent conductive piece on the surface of light transmissive ceramic which causes birefringence when impressed with a voltage, and generating a potential difference by using a head for voltage impression. CONSTITUTION:Counter electrodes are formed on a PLZT substrate and the voltage is impressed between those electrodes to cause birefringence on the PLZT substrate. For the purpose, a polarizing film is arranged on both surfaces of the PLZT substrate and then there is a difference in brightness between the part where the birefringence is cause and other parts to make a display. When a switch is opened while the voltage is impressed to the PLZT substrate, the birefringence caused on the PLZT substrate is maintained and a storage state is entered. This is reset by short-circuiting the electrodes.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is effective when used as an information output terminal device, and is a very simple, low-cost device capable of directly recording, displaying, retaining, and erasing information. The present invention relates to a display device with low power consumption.

BACKGROUND OF THE INVENTION In recent years, information and communication technologies such as optical communications, advanced communication systems (INS), and value-added communication networks (VANs) have been rapidly developing. With the accompanying shift to OA and HA, the development of information output terminal equipment is attracting much attention. Currently, output terminal devices that are being used and are being actively developed are soft copies represented by displays such as CRTs and liquid crystal displays, and printers.

-CRTs and liquid crystal displays do not have a memory function of their own, so if you want to keep the output information displayed for the required amount of time, you must leave the power on. Requires electricity. Also, CRT
Displays are large devices that are difficult to carry. On the other hand, flat displays using liquid crystals or the like allow the device to be made smaller, but the display quality is poor and the amount of information per screen is small. Also, when driving the liquid crystal using matrix drive etc., increasing the amount of information on one screen,
The number of drive circuits increases and the cost becomes very high.

3A - On the other hand, output devices such as printers have sufficient information capacity and resolution, and can directly record and retain information, but
Maintenance of ink, toner, etc. is required, and
Once the information has been output...-Tocobee cannot be played back.

``Problems to be Solved by the Invention'' As mentioned above, conventional information output terminal devices include CRTs.
, such as LCD displays, which can rewrite information, but have no memory of their own, and the information capacity of one screen is insufficient, and printers, which can record and retain information. is easy, but there are some that require maintenance and cannot be rewritten. but,
There is nothing that combines both functions.

The present invention addresses the problem of poor image quality caused by soft copies such as CRTs.
Solve the high cost, non-memory nature, need for maintenance, and non-rewritability of printers and other tube copies, and record the necessary information, for the necessary time, and with sufficient image quality at low cost and low power consumption. This invention relates to a display device that can display, hold, and rewrite information.

Means for Solving the Problems In order to solve the above problems, the display device of the present invention includes a plurality of
It has a structure in which transparent conductive pieces are formed that do not touch each other, and a voltage applying head is used to apply a potential difference to the surface of the optically conductive porcelain.

Function The present invention, as in the above-mentioned configuration, can conduct any desired electrical conduction on the surface of the translucent porcelain through a plurality of transparent conductive pieces formed on the surface of the translucent porcelain having the voltage-controlled Kerr effect. Information is displayed by applying a potential difference between local areas using a voltage application head to cause birefringence. Furthermore, by scanning the voltage applying head or the translucent porcelain, the potential of the portion where birefringence has occurred is opened, the displayed information is stored, and the displayed information is erased by short-circuiting.

As a result, information can be directly recorded, displayed, held, erased, and erased.Through writing, erasing, and holding information, the 5vapor consumes almost no power and has a very simple configuration.

Embodiments Hereinafter, display devices according to embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a configuration diagram of a display device in an embodiment of the present invention. In FIG. 1, 1 is a translucent porcelain having an electro-optical effect, and in this example, lanthanum-added lead zirconate titanate (PLZT) with a large Kerr effect composition - (La/Zr/ Ti=9/65/
35) was used.

2 is a transparent electrode piece formed on a PLZT plate 1,
In this example, the ITO electrode was placed in a 50 (μm) x 50 (μm) square piece.
) arranged at intervals of Formation of IT○ is performed by vapor deposition and photoI
J) Performed using lithography technology. 3 is PLZ
A voltage potential application head capable of locally applying a potential difference on the surface of the T plate 1; 4 is a voltage application head 3;
This shows a head drive unit that can arbitrarily scan in the x-y direction. Reference numerals 6 and 6 indicate 6A-- a polarizing plate and an analyzer plate, which are arranged above and below the PLZT substrate 1 and the head scanning drive unit, and in this embodiment, 5
, 6 were arranged so that their polarization axes were in the same direction (parallel Nicols). FIG. 2 shows a structural diagram of the voltage applying head section shown in FIG. 1. In FIG. 2, 7 is a flexible sheet, and in this example, a polyimide resin sheet was used.

8 is a reinforcing plate for fixing the polyimide resin sheet 7, and 9 is a group of electrodes formed on the sheet 7. The formed electrodes had an electrode width of 100 (μm) and an electrode spacing of 150 (μm). Reference numeral 10 indicates a lead wire for applying a voltage to each electrode of the electrode group 9. The operation of the display device configured as described above will be described below.

FIG. 3 shows PLZT in a display device according to the present invention.
FIG. 3 is a principle diagram for explaining the function of the element. As shown in FIG. 3, when opposing electrodes are formed on a PLZT substrate and a voltage is applied between the electrodes, birefringence occurs in the PLZT substrate. Therefore, if polarizing films are placed above and below the PLZT7'... substrate, brightness and darkness can be created between the area where birefringence occurs and the other areas. (The state shown in FIG. 3(a)) In other words, display is possible. Next, Figure 3 (b
), when the switch is opened while a voltage is applied to the PLZT substrate, the birefringence generated in the PLZT substrate is maintained.

In other words, it becomes a memory state. This can be eliminated by shorting the electrodes as shown in FIG. 3(C). Using the characteristics of the PLZT element described above, every other electrode in the electrode group 9 of the voltage application head shown in FIG. 2 is set to o(V), and a voltage is applied arbitrarily to the remaining electrodes. , the head scanning drive section shown in FIG. 1 causes the head to scan and cause the display state and storage state to occur. In other words, when the voltage applying head 3 shown in FIG. 1 and the transparent conductive piece 2 come into contact with each other, a potential difference is applied to an arbitrary part on the PLZT substrate to cause a display state.

Next, when the head is scanned with the voltage still applied to the voltage application head 3, the part of the trajectory will be in the state where it becomes open after the -voltage is applied (the state shown in Fig. 3(b)). ), and the memory state can be realized.

In this example, the memory state was left at room temperature for more than 20 days, but the state did not change. The information displayed and recorded in this way can be obtained by scanning the PLZT substrate 1 with the voltage of the voltage application head 3 set to 0 (v), or by touching the surface of the PLZT substrate 1 with conductive rubber, a finger, etc. Erased by rubbing. Furthermore, when a transmissive display is used as in the configuration of this embodiment shown in FIG.
The display contrast was 20 or more.

In the embodiment of the present invention, a transmissive display device is used, but in the configuration shown in FIG. 1, the PLZT substrate 1
It is clear that a reflective type structure in which a reflective film is provided on the back surface and the polarizing plate 6 is removed has the same function, and is not limited to a transmissive type structure.

Effects of the Invention As described above, the present invention involves forming a transparent conductive piece on the surface of a translucent porcelain that causes birefringence by applying a voltage, and using a voltage applying head to generate an electric 9beno potential difference. It is a display device with a configuration that provides information that can directly record, display, retain, and rewrite information that was not available in conventional display devices, and all of these functions require almost no power. Furthermore, the display device of the present invention can be realized as a system with a very simple configuration, and the display quality is sufficient.

Such a display device is highly desired as a simple information output terminal in a highly information-oriented society that will continue to develop in the future, and its effects are significant.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a display device according to the present invention, and FIG.
The figure is a perspective view of the main part of the voltage application head section in FIG.
FIG. 3 is an explanatory diagram showing the principle of the display device according to the present invention. 1...-PLZT substrate, 2...transparent conductive piece, 3
... Voltage application head, 4... Head scanning drive section, 6... Polarizing plate, 6... - Analyzing plate, 7...
...Flexible sheet, 8...-Reinforcement plate, 9...
Electrode group, 10...1o beno...lead wire. Name of agent: Patent attorney Toshio Nakao and 1 other person 4-
PLET group d 4---1. P Spoon E To Sho Figure 3/“1” Pi Zun Bash; Do = Naiyo 7) 徨をedge (ω) (禾7rX)P
Lz Shimoki ``DanfV(,, Hayade Aki)k < b+
``Bow/dragon;

Claims (2)

[Claims] (1) On a translucent porcelain surface with voltage-controlled Kerr effect,
Forming a plurality of transparent conductive pieces that do not touch each other, applying a potential difference to the surface of the translucent porcelain using a voltage applying head, and changing the intensity of light that passes through the polarizing plate placed in front of the porcelain. A display device characterized by: (2) The display device according to claim 1, wherein the voltage application head has at least one pair of electrodes and scans over the porcelain.