JPS60105032A - Liquid crystal display panel - Google Patents

Abstract

PURPOSE:To detect an input point position on a liquid crystal display screen with no disturbance nor conversion of coordinates, by securing correspondence between the intersecting points of transparent row and column electrodes and input points on the screen and having direct contact of a finger or a conductor. CONSTITUTION:A voltage scan circuit 12 scans repetitively the rectangular wave voltage 21 having a phase difference equivalent to the pulse width to a transparent row electrodes 9 of a1, b1 and c1. For instance, the row and column electrodes corresponding to the input point of an alphabet letter B conducts with contact of a finger. Then the voltage is applied to a column electrode b2 while the voltage is applied to the row electrode a1. The voltage applied to the electrode b2 is amplified by an amplifier circuit 17 up to the level of voltage applied to the electrode a1. A position detecting circuit 18 detects an input point position according to the scan timing of the row electrode and discrimination of the column electrode to which the scan voltage is applied and then delivers a position signal. A display decoder circuit 19 selects a liquid crystal display electrode by said position signal. A liquid crystal drive circuit 20 decides the level of the voltage to be applied to the display electrode and displays a desired picture to a liquid crystal display panel 6.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an information type output device for electronic display equipment. The present invention relates to a liquid crystal display input/output device equipped with a detection plate.

[Background of the invention]

Conventionally, in an electronic device equipped with an image display device, when the position of an arbitrary point among a plurality of points on the image display surface is used as input information, a method for detecting the input point is to detect the ordinate of the position of the input point. An indirect method using the and abscissa was used.

An example thereof will be explained using FIG. In Figure 1,
A, B, C, D, E on the image display surface 1.

Nine alphabets, F, G, H, and ENG, are displayed in a grid pattern. According to the coordinate method, for example, the positions of B+F are represented by (2,1) and (3°2), respectively. Here, when the alphabet Bt- is specified, one of the nine arbitrary input points 2 on the image display will be erased from the display screen or changed to the lowercase letter S. Assume that the input is to change the display of an image.

Three vertical input point detection devices 3KIH, 2H and 3H are provided for detecting manual points in the vertical direction. For example, by operating the IH input capotan,
Input points corresponding to A, D or G can be detected. Furthermore, the lateral input point detection device 4 for detecting lateral input points is provided with three input buttons, IV, 2V, and 3V. For example, the input point corresponding to A, B, or C can be detected by operating the input button 1. For example, if you want to specify the alphabet kl,
Using its coordinates (2,1)a-, input capotan 2H and 1
Just operate v. According to this method, as the number of input points increases, input ports in the vertical and horizontal directions must be added.

For this reason, a method of using a keyboard as an input device has been considered. In FIG. 2, the input devices 3 and 4 of FIG. 1 are replaced by four keys IH, 2H.

A keyboard 5 consisting of 3H and 4H is provided.

Here, keys IH, 2H and 3H are used to input the ordinate and abscissa coordinate of an input point, and key 411 is used to distinguish between the ordinate and abscissa. At this time, for example, detection of Alphabella)H is performed by operating the keys in the order of 2H, 4H, and IH.

In any case, according to the input point detection method using coordinates, it is necessary to convert the position of a human power point into coordinates. This becomes a very complicated task, especially when one point out of a large number of points, such as the eyes of a base board, is used as an input point. Further, after this process, when actually inputting coordinates, the input device must be operated multiple times. For example, in the former case of the above example, the input capo buttons 2H and 1■ are operated twice, and in the latter case, the keys 2H, 4H and IH are operated three times.

The complexity and trouble of such coordinate conversion and input operations become more and more noticeable as the number of inputs increases.

By the way, CRT (cathode ray tube) is used for displaying images.
By using the ode l (, ay Tube), the input point position can be detected by simply touching the tip of the light pen to the input point position on the CRT display surface, which is superior to the coordinate-based input point detection method. The above drawbacks are eliminated. However, the use of a CRT or light pen device increases the scale of the electronic display device and increases the operating power, which is a serious drawback, especially in devices intended to be portable.

As a solution to these drawbacks, there is a liquid crystal display device that is characterized by its miniaturization and low power consumption.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a simple input point detection board for detecting input point positions on a liquid crystal display surface without performing coordinate transformation and without interfering with the liquid crystal display. Chiru.

[Summary of the invention]

The present invention provides transparent row electrodes and transparent column electrodes that intersect in a matrix on the surface of a transparent insulating plate placed in front of a liquid crystal display panel, and uses the intersection points of the transparent matrix electrodes, which are insulated by a transparent insulator, as input for image display. The position of the input point can be detected by directly touching the input point with a finger or a conductor [Embodiment of the Invention] FIG. 3 schematically shows an embodiment of the present invention. It is. In FIG. 3, the liquid crystal display panel 6 includes A, B, and C.
, D, E, F, G, H and ■ 9 alphabets 7
is displayed on the base grid. A transparent insulating plate (for example, a transparent glass plate or a transparent acrylic plate) 8 is placed in front of the liquid crystal display panel, and three transparent row electrodes (for example, a vacuum-deposited indium oxide film) 9 are placed on the surface of the transparent insulating plate. And three transparent column electrodes 10 are arranged in an IJ square shape. The transparent matrix electrodes are insulated from each other by a transparent insulator (for example, a silicon oxide film) 11 at their nine intersection points.
The intersection points are respectively arranged on the display positions of the nine alphabets and form input points. Outside the image display surface, one of the transparent row electrodes is connected to a voltage scanning circuit 12 and one of the transparent column electrodes is connected to a scanning voltage detection circuit 13.

FIG. 4 is a cross-sectional view of FIG. 3, illustrating the input point detection plate on the liquid crystal display panel.

The liquid crystal display panel 6 includes two transparent substrates 16, a liquid crystal material 14 sealed between the substrates, and two polarizing plates 5 disposed on the outside of each substrate so that polarized light is orthogonal to each other. It consists of However, in FIG. 4, the upper and lower transparent electrodes inside the transparent substrate 16 are not shown. In a liquid crystal display panel, the polarization of the liquid crystal material between the transparent electrodes is controlled by a voltage applied between the transparent electrodes, and images are displayed using transmitted light and blocked light of the display panel.

The input inspection publication includes a transparent insulating plate 8 provided on the front surface of the liquid crystal display panel 6, a transparent row electrode 9 on the insulating plate, and a transparent insulating material 1.
1 and a transparent column electrode 10.

According to one embodiment of the present invention, the input point detection board can be constructed by arranging a single transparent board in front of the liquid crystal display panel, which helps miniaturize the display device and completely eliminates image display. It has the effect of not interfering with it.

In this embodiment, input point position detection is performed as follows. For example, when detecting alpha-pella) B, directly touch the intersection of the transparent matrix electrodes on the alphabet B with your finger or a conductor as shown in Figure 5 to establish continuity between the transparent row electrode and the transparent column 1 pole. Bye. At this time, the scanning '6L pressure applied to the row electrodes constituting the intersection on Alphabella) B is also applied to the column electrodes constituting the intersection K4'fl via the contact resistance of the finger or the conductor. Ru. If this scanning voltage is detected by the full scanning voltage detection device, the position of the intersection, that is, alphapella)B'? : Can be detected.

The process from detecting the position of an input point to displaying an image on the liquid crystal display panel corresponding to the input point will be explained using the control circuit block diagram shown in FIG.

The voltage scanning circuit 12 sequentially and repeatedly scans the transparent row electrodes 9 of al+bl and C1 with a rectangular wave voltage 21 having a phase difference equal to the pulse width as shown in FIG. At this time, if the row electrode and column electrode are electrically connected at the input point corresponding to the alphabet B, for example, the voltage is applied to the column electrode b2 only while the voltage is applied to the row electrode al.

Since the voltage applied to the column electrodes is lowered in voltage level due to the contact resistance of the finger, etc., it is amplified by the amplifier circuit 17 to the level of the voltage applied to the row electrodes.

The position detection circuit 18 detects the input point position based on the timing of scanning the row electrodes and distinguishing between the column electrodes to which the scanning voltage is applied, and outputs a position signal.

The display decoder circuit 19 selects the liquid crystal display 1m for displaying the image corresponding to the input point based on the position signal.

The liquid crystal drive circuit 20 determines the voltage level to be applied to the liquid crystal display electrodes, operates the liquid crystal display panel 6, and displays a desired image.

This embodiment has the advantage that it is possible to perform input operations exactly the same as when using a light ben.

FIG. 6 shows another embodiment of the present invention, which differs from FIGS. 3 and 4 in that transparent row electrodes 9 and transparent column electrodes 10
In place of the transparent insulating plate 8, a polarizing plate 15 and a transparent substrate 1 are installed.
This point is separated by 6. This embodiment has the advantage that there is no need for the transparent insulator 11, and that the image display scan electrode and the transparent row electrode 9 to which the position detection scan voltage is applied can be used in combination in the liquid crystal display panel. If a high-frequency scanning voltage for position detection with a level value that does not affect the image display is applied to the image display scanning electrode together with the image display scanning voltage, when a finger or a conductor touches the input point, Through the change in capacitance at the input point position, the high frequency voltage for position detection is also induced in the transparent column electrode 10, whereby the input point position is detected.

Another embodiment of the present invention is a game board using a liquid crystal display panel to display the board surface of the board.

An input point detection board according to the present invention is provided on the board display. The intersection points of the transparent matrix electrodes on the input point detection board are vertical and
It is provided to match the intersection of horizontal ruled lines. At this time, by directly touching the electrode intersection with a finger or a conductor, it is possible to detect whether a white stone or a black stone is displayed on the ruled line intersection corresponding to the intersection, so when actually playing the board using Go stones, It has the effect of allowing you to enjoy the feeling of

〔Effect of the invention〕

As described above, according to the present invention, the input point position can be detected by directly touching the input point position on the image display surface with a finger or a conductive object, so the input operation is very easy. Simplified. Further, since the substantially transparent detection plate is disposed on the image display surface, there is an effect that the display device is not obstructed from being made into a shed, and the image display is not obstructed.

[Brief explanation of the drawing]

1 and 2 are front views of the conventional example, FIG. 3 is a front view of the embodiment of the present invention, and FIG. 4 is a cross-sectional view of the embodiment of the present invention,
FIG. 5 is an input operation diagram of an embodiment of the invention, FIG. 6 is a cross-sectional view of another embodiment of the invention, and FIG. 7 is a control circuit block diagram. 8... Transparent insulating plate, 9... Transparent row electrode, 10...
Transparent column electrode, 11... Transparent insulator, 12... Voltage scanning circuit, Sakae 1 Figure v=2 Figure 3I2] v; 4 Figure 6

Claims (1)

[Claims] 1. A liquid crystal display panel comprising a liquid crystal, a substrate holding the liquid crystal therebetween, and means for controlling the display state of the liquid crystal, wherein the liquid crystal display panel includes a capacitance detection type. A liquid crystal display panel comprising input means. 2. The liquid crystal display panel according to claim 1, characterized in that a dielectric is provided between the first electrode and the second electrode as a capacitance detection type input means. display panel. 3. The liquid crystal display panel according to claim 2, wherein an electrode for controlling the display state of the liquid crystal is used as the first electrode or the second electrode.