JPS62144232A - Input display device - Google Patents

Abstract

PURPOSE:To display the locus of an input as soon as this input is supplied by providing a transparent sheet and a polarizing film between the input part and the display part of an input display device using a plate-shaped light transmitting porcelain. CONSTITUTION:The voltage is applied between both transparent band-shaped electrodes and an optional point of a tablet 21 for detection of input coordinates. At the same time, a transparent sheet 23 is pressed to produce a local potential difference on a PLZT flat plate 22 to secure a displays mode after a contact is obtained between a part of an electrode 24 and the back side of the plate 22. Under such condition, the pressure point is shifted and this shift locus part is opened after application of voltage to be displayed and also held. Then the information thus supplied, displayed and held can be easily erased by pressing an area to be erased over the tablet 21 in a state where the voltage applying electrode group of a transparent band-shaped electrode group 24 is grounded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an input display device that provides power and direct display of information at the same time.

Conventional technology In recent years, information and communication technologies such as optical communication, advanced communication systems (INS), and value-added communication networks (VAN) have been rapidly developing.
Demand for devices is also increasing, and development of various input methods and applied devices is actively underway. However, current handwriting input devices require a display 'ATL' along with the input device because the trajectory of input character information etc. cannot be seen. 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 trajectory of character information, etc. that has been input by hand is displayed.

A block 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. In FIG. 4, 41 is a tablet for detecting input coordinates, 42 is an X-Y coordinate detection circuit, 43 is a drive circuit for a display section, and 44 is a display element. In FIG. 5, 51 is a tablet for detecting input coordinates;
2 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 pressure is applied to any point, 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. The position of the pressure point is detected as (X, Y) coordinates, 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 described 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 as input, does not require a drive circuit for the display section separate from the input section, is extremely easy to configure, 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 unit that allows input of the position of a pressure point by applying pressure. The input display device uses plate-shaped translucent porcelain having a voltage-controlled Kerr effect and has a polarizing plate on the back surface as a display portion, the input display device having a polarizing plate on the back surface of the input display device. It has a configuration in which a transparent sheet having a plurality of strip-shaped transparent electrodes and a polarizing film are disposed on the back surface of the translucent porcelain, which is disposed so as not to come into contact with the translucent porcelain.

Function The present invention has the above-described structure, in which a band-shaped transparent i8i is placed on a transparent sheet arranged so as not to come into contact with a plate-shaped translucent porcelain.
The band-shaped transparent electrodes are alternately used as ground side electrodes and voltage applying electric bridges to apply a voltage between adjacent electrodes, and to apply pressure to any part of the tablet from the surface of the tablet left. The sheet is brought into contact with translucent porcelain, a potential difference is generated in any part of the translucent porcelain, the intensity of light is changed through a polarizing plate, and direct display is performed simultaneously with input. Furthermore, by returning the pressurizing part to its original state, the band-shaped transparent electrode and the translucent porcelain come out of contact, allowing the potential to be maintained and the displayed information to be maintained. In addition, without applying voltage to the band-shaped transparent electrode, it can be erased by applying pressure to the displayed area and bringing the sheet into contact with translucent porcelain. By switching -OFF, writing and erasing information can be input through the tablet. This makes it possible to display the trajectory of information writing and erasing at the same time as the input, consumes almost no power through input, display, and retention, and eliminates the need for a drive circuit for the display section separate from the input section. No, it has a very simple configuration.

Embodiments Hereinafter, input display devices according to embodiments 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 can input the position of a pressure point 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 transparent sheet placed on the surface of the PLZT flat plate 22 so as not to come into contact with the PLZT flat plate 22.

Reference numeral 24 indicates a group of transparent band-shaped electrodes formed on the back surface of the transparent sheet 23.

25 is a polarizing film placed on the surface of the transparent sheet; 26
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 25.2
The polarization axis of the polarizing film No. 6 is arranged at an angle of 45° with respect to the longitudinal direction of the band-shaped electrode group 24. The transparent band-shaped electrode produced in this example had an electrode width of 500 (μm) and an electric bridge interval of 5
00 (, cam), and every other strip electrode is set as a ground side electrode group, and the other strip electrodes are set to O(V) and 400 by a switch.
(V) as a group of voltage application electrodes that can be switched.

Ta. The operation of the input display device configured as described above 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 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 a PLZT substrate, brightness and darkness can be created between the areas where birefringence occurs and the other areas. (The state shown in FIG. 3(a)) In other words, display is possible. Next, as shown in FIG. 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 is shown in Figure 3 (C)
It can be erased by shorting between the electrodes as shown in the figure.

Utilizing the characteristics of the PLZT element as described above, a voltage was applied between the transparent band-shaped electrodes shown in FIG. 2, and a transparent band-shaped electrode was formed at the same time as pressure was applied to an arbitrary point on the input coordinate detection tablet 21. The transparent sheet 23 is pressurized so that a part of the transparent band-shaped electrode group 24 is brought into contact with the surface of the PLZT flat plate 22, and a potential difference is locally generated on the PLZT flat plate 22 to cause a display state. When the pressure point is moved while voltage is still applied to the transparent band-shaped electrode group 24, the contact portion between the band-shaped electrode group 24 and the PLZT flat plate 22 moves, but the voltage is not applied to the part of the trajectory. After that, the state is the same as the state shown in FIG. 3(b). Therefore, it will be displayed and also retained. At this time, the information input to the input coordinate detection tablet 21 is displayed on the display element 14 shown in FIG. 1, and is also output to the output terminal 13 through the X-Y coordinate detection circuit. Furthermore, the information input, displayed, and retained in this way can be easily accessed by applying pressure to the area to be erased from above the input coordinate detection tablet while the voltage application electrode group of the transparent strip electrode group 24 is grounded. The erased information can also be output to the output terminal 13 in the same way. The display contrast of the display section in this example was 10 or more.

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 that allows input of the position of a pressure point by applying pressure, and has a polarizing plate on the back side as a display section. An input display device using a plate-shaped translucent porcelain having a voltage-controlled Kerr effect, the input display device being arranged between the input section and the display section so as not to come into contact with the plate-shaped translucent porcelain. A transparent sheet with a plurality of band-shaped transparent electrodes and a polarizing film are placed on the back side of the handwriting input device. At the same time, the trajectory is displayed. This makes configuration very easy and
Low cost and low power consumption can also be achieved.

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

[Brief explanation of drawings]

FIG. 1 is a block diagram of the configuration of an input display device according to an embodiment of the present invention, FIG. 2 is a perspective view of an input display section, and FIG. 3 explains the principle of display function in the display section. 4 is a block diagram of a conventional input display device, and FIG. 5 is a perspective view thereof. 11...Tablet for detecting input coordinates 12...
. . . X-Y coordinate detection circuit, 13 . . . Output terminal, 14 . . . Display element, 21 . . . Input coordinate detection tablet. 22...PLZT flat plate, 23...Transparent sheet 24...Strip electrode group, 25...
・Polarizing film, 26... Polarizing film with reflective film Agent's name Patent attorney Toshio Nakao 1 person Figure 1 21-m- input, left leg IHM tablet 22 --- P
LZTq 23-1171vJK sheet 24--One band electric 1 Genyo 25-m-Polarizing film 26--Polarizing film with reflective film with reflective waist 3 diagram

Claims (1)

[Claims] The input part has a transparent and flexible tablet that allows you to input the position of the pressure point by applying pressure, and the display uses a plate-shaped translucent porcelain with a voltage-controlled Kerr effect and a polarizing plate on the back side. between the input section and the display section, a transparent sheet having a plurality of band-shaped transparent electrodes on the back surface and arranged so as not to contact the plate-shaped transparent porcelain, and a polarizing film. An input display device characterized by: