JPS6339020A - Input display device - Google Patents

Abstract

PURPOSE:To obtain an input display device which can easily display the information concurrently with an input by using a transparent tablet which performs input of coordinates with pressure and providing a plate light transmissive ceramics having the Kerr effect for voltage control under said tablet. CONSTITUTION:The voltage is applied to a transparent belt-shaped electrode group 25 set on a transparent sheet 24 and the pressure is applied to an optional point of a tablet 21. At the same time, a contact is secured between a part of the group 25 and a flat plate 22 of titanate zirconate (PLZT) added with lanthanum. Thus a local potential is produced on the PLZT plate and a display mode is secured. When the pressing point is moved, the contact part between the group 25 and the plate 22 is also moved. However the display mode is maintained to show a locus. While the coordinate information is outputted to an output terminal 13 through an X-Y coordinate detecting circuit. In an erasion mode a desired area is pressed and erased while the group 25 is grounded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a very simple and low-cost input display device that is effective as an information input device and can directly display information simultaneously with input.

Conventional technology In recent years, optical communications and advanced communication systems (INS) have become popular.

Value-added communication! Information and communication technologies such as i (VAN) are rapidly developing. Along with this, the demand for handwriting input devices in drawing communication devices is also increasing, and development of various manual methods and applied devices is actively progressing. However, current handwriting input devices require a display device along with the input device because the trajectory of input character information cannot be seen. Furthermore, recently, devices have been studied and developed in which a flat display device such as a liquid crystal display is placed directly below an input tablet, and the locus of character information etc. input by hand is displayed. A schematic diagram of the configuration of such a conventional input display type device is shown in FIG. 4, and a structural diagram of the input display section is shown in FIG. 5. In FIG. −
A Y coordinate detection circuit, 43 a drive circuit for the display section, and 44 a display element. In FIG. 5, 51 is a tablet for detecting input coordinates, and 52 is a display element.

Regarding the conventional input display device configured as above,
The operating mechanism will be explained below.

Here, as the input coordinate detection tablet 41 shown in FIG. Let's take an example using . Electrodes are provided at both ends of each of the two uniform transparent resistance sheets so that they do not overlap each other, and the electrode formed on one resistance sheet is grounded, and the electrode formed on the other resistance sheet is grounded. Connected to a constant current source. When an arbitrary point is pressurized, the two resistance sheets come into contact and the current ratio flowing out from both ends of the two resistance sheets changes.Then, the current ratio is sent to the x-y coordinate detection circuit. and the position of the pressure point (
The (X, Y) coordinates are detected, and the (X, Y) point is displayed on the matrix drive circuit that is the drive circuit for the liquid crystal display panel.

However, in the above configuration, a circuit for driving the display section is required in order to display the locus of the input point.
The configuration is complex. Furthermore, as the amount of information per screen increases, the number of drive circuits increases, resulting in extremely high costs.

Problems to be Solved by the Invention As mentioned above, the conventional handwriting input device has a system configuration in which a device for detecting input coordinates and a display device for displaying the trajectory after input are arranged independently. However, it has become complicated, large-sized, and expensive.

The present invention is capable of directly displaying information at the same time it is input, does not require a drive circuit for the display section separate from the input section, has a very simple configuration, is low cost, and displays input information at the required time. The present invention relates to a low power consumption input display device that can hold data.

Means for Solving the Problems In order to solve the above-mentioned problems, the input display device of the present invention uses a transparent and flexible tablet as an input section that allows input of the coordinates of a pressure point by applying pressure. An input display device using a plate-shaped translucent porcelain having a voltage-controlled Kerr effect with a plurality of island-shaped transparent electrodes on the front surface and a polarizing plate on the back surface as a display section, the input section and the A transparent sheet and a polarizing film having a plurality of band-shaped transparent electrodes on the back surface arranged so as not to contact the plate-shaped translucent porcelain are disposed between the display parts, and a polarizing film is disposed on the plate-shaped translucent porcelain. Each of the island-shaped transparent electrodes and a portion of two adjacent strip-shaped transparent electrodes formed on the sheet are positioned so as to overlap.

Function The present invention, as configured above, forms a plurality of island-shaped transparent electrodes on the surface of a plate-shaped translucent porcelain having a voltage-controlled Kerr effect, and each of the island-shaped transparent electrodes has an adjacent electrode. A transparent sheet with a band-shaped transparent electrode provided at a position where two matching band-shaped transparent electrodes partially overlap is placed so as not to contact the plate-shaped transparent porcelain, and the band-shaped transparent electrode provided on the transparent sheet is aligned. The main electrode is used as a ground electrode, and the remaining electrode is used as a voltage application electrode to apply voltage, and from the surface of the tablet,
Pressure is applied to any part of the tablet to bring the sheet into contact with the translucent porcelain, creating a potential difference between arbitrary island-like electrodes of the translucent porcelain and changing the intensity of light through the polarizing plate. This allows for manual and direct display at the same time. Furthermore, by returning the pressurizing part to its original state, the band-shaped transparent electrode and the translucent porcelain come out of contact, the potential generated in the island-shaped electrode can be held, and the displayed information can also be held. At this time, since the island-shaped electrodes are formed on the translucent porcelain, the potential difference generated is uniform between the electrodes compared to a state where there are no electrodes, and resolution can also be improved. Also,
It can be erased by applying pressure to the displayed area and bringing the sheet into contact with the translucent porcelain without applying voltage between the band-shaped transparent electrodes. Turn on the voltage (7) by turning the voltage applying electrode with a switch, etc. By switching -OFF, writing and erasing information can be input through the tablet.

This allows the display of information writing and erasing trajectories at high resolution and at the same time as input, consumes almost no power through input 5 display and retention, and requires a drive circuit for the display section separately from the input section. Embodiment with a very simple configuration that does not require the following: An input display ulF according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an input display device according to an embodiment of the present invention, and FIG. 2 is a block diagram of an input display section. In FIG. 1, 11 is a tablet for detecting input coordinates, 12 is an X-Y coordinate detection circuit, 13 is an output terminal, and 14 is a display element. In FIG. 2, numeral 21 is a transparent and flexible input coordinate detection tablet that allows the position of a pressure point to be input by applying pressure. A tablet was used to detect the current flowing through the resistor. 22 is a translucent porcelain having an electro-optical effect, and in this example, lanthanum-added lead zirconate titanate (PLZT) is used.
composition with a large Kerr effect (L a / Z r /
T i = 9/65/35) was used. 23 is a group of island-like transparent electrodes arranged in a matrix formed on the surface of the PLZT flat plate 22, and in this example, ITO electrodes are used,
The electrodes were formed with an interval of 50 (μm). 24 is PLZT
A transparent sheet is placed on the surface of the flat plate 22 so as not to come into contact with the PLZT flat plate 22. 25 is transparent sheet 2
4 shows a group of transparent band-shaped electrodes formed on the back surface of 4.

26 is a polarizing film placed on the surface of the transparent sheet, 27
is a polarizing film placed on the back surface of the PLZT flat plate 22, with aluminum vapor-deposited as a reflective film on the back surface, and 26.2
The polarization axis of the polarizing film No. 7 is arranged at an angle of 45° with respect to the longitudinal direction of the band-shaped electrode group 24. The band-shaped transparent electrode group 25 produced in this example has an electrode width of 100 (μm),
The electrode spacing is 100 (μm), and the electrodes are arranged so as to form exactly the shape of each row of the matrix-like island-like transparent electrodes formed on the PLZT flat plate. The band-shaped transparent electrode group 25 formed on the transparent sheet 24 is grounded, and the PLZT flat plate 22
The band-shaped transparent electrode group 23 formed in
The operation of an input display device configured as 0 or more in which a group of voltage application electrodes can be switched will be described below.

FIG. 3 is a principle diagram for explaining the function of the PLZT element in the display section of the input display device according to the present invention. As shown in FIG. 3, when opposing electric bridges 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 PLZT substrate, brightness and darkness can be created between the areas where birefringence occurs and the other areas (shape B in Figure 3(a)), in other words, display can be performed. Next, as shown in FIG. 3('b), when the switch is opened with a voltage 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].

Utilizing the characteristics of the PLZT element as described above, a voltage is applied to the transparent band-shaped electrode group 25 on the transparent sheet 24 shown in FIG. A part of the transparent strip electrode group 25 is made of PLZT.
It is brought into contact with the surface of the flat plate 22, and a potential difference is locally generated on the PLZT flat plate 22 to cause a display state.

Next, when the pressure point is moved while the voltage is still applied to the transparent band-shaped electrode group 25 on the transparent sheet, the contact portion between the band-shaped electrode group 25 and the PLZT flat plate 22 moves, but the part of the trajectory is the same as the open state after voltage is applied, that is, the state shown in FIG. 3 tb+. Therefore, it will be displayed as well as retained. Also at this time,
The information input to the input coordinate detection tablet 21 is
It is displayed on the display element 14 in the figure and is outputted to the output terminal 13 through the X-Y coordinate detection circuit.

Furthermore, the information input 1 displayed and held in this way can be easily displayed by applying pressure to the part to be erased from above the input coordinate detection tablet while the transparent band-shaped electrode group 25 on the transparent sheet 24 is grounded. The display contrast of the display section in this example was 10 or more, and the erased information could also be output to the output terminal 13.

In the embodiment of the present invention, a reflective input display device is used, but in the configuration shown in FIG. It is clear that a transmissive configuration has the same function, and is not limited to a reflective configuration.

Effects of the Invention As described above, the present invention uses a transparent and flexible tablet as an input section on which the coordinates of a pressure point can be entered by applying pressure, and a plurality of transparent island-shaped tablets on the surface as a display section. An input display device using plate-shaped translucent porcelain having electrodes and a voltage-controlled Kerr effect with a polarizing plate arranged on the back surface,
A transparent sheet and a polarizing film having a plurality of band-shaped transparent electrodes on the back surface arranged so as not to come into contact with the plate-shaped transparent porcelain are arranged between the input section and the display section, and a polarizing film is arranged between the input section and the display section. Each island-shaped transparent electrode on the translucent porcelain and two adjacent parts of the strip-shaped transparent electrode formed on the sheet are positioned so as to overlap, and in a conventional handwriting input device, input This system does not require the display system required to recognize the trajectory of coordinates, and displays the trajectory in high resolution at the same time as input. This makes the configuration extremely simple, and also achieves low cost and low power consumption.

It is thought that the need for such an input display device will increase in the future as an information input terminal in a drawing communication device in an increasingly advanced information society.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the configuration of the input display device according to the present invention, FIG. 2 is a configuration diagram of the input display section, and FIG. 3 is a diagram explaining the principle of display function in the display section of the input display device according to the present invention. FIG. 4 is a block diagram of a conventional manual display type device, and FIG. 5 is a diagram of a conventional input display section. 11... Tablet for human coordinate detection, 12...
...X-Y coordinate detection circuit, 13... Output terminal, 14... Display element, 21... Tablet for input coordinate detection, 22...・PLZT flat plate, 23... Band-shaped transparent electrode group, 24...
Transparent sheet, 25... Island-shaped transparent electrode group, 26.
...Polarizing film, 27...Polarizing film with reflective film. Name of agent: Patent attorney Toshio Nakao and one other person Figure 1 23--Jl, I enter B Tsukiranshin 6 boats Figure 3 Figure 4

Claims (1)

[Claims] The input section is a transparent and flexible tablet that can input the coordinates of the pressure point by applying pressure, and the display section is a voltage-controlled card with multiple island-shaped transparent electrodes on the front and a polarizing plate on the back. An input display device using a plate-shaped translucent porcelain having an effect, in which a plurality of porcelain plates are disposed between the input part and the display part on the back surface of the plate-shaped translucent porcelain, and are arranged so as not to come into contact with the plate-shaped translucent porcelain. A transparent sheet having a band-shaped transparent electrode and a polarizing film are arranged, and each island-shaped transparent electrode on the plate-shaped translucent porcelain and one of two adjacent band-shaped transparent electrodes formed on the sheet are arranged. An input display device characterized in that the parts are positioned so as to overlap each other.