JPH06314165A - Integrated type display tablet device and its driving method - Google Patents

Abstract

PURPOSE:To make a display screen large, to increase its productivity and reduce the cost, and to improve the precision of coordinate detection. CONSTITUTION:A switching circuit 8 selects the side of a display control circuit 4 in a display period and the side of a detection control circuit 5 in a coordinate detection period. A row electrode driving circuit 2 outputs row electrode scanning pulses in the display period to scan row electrodes G1-G6 in order. A column electrode driving circuit 3 outputs column electrode scanning pulses in an (x)-coordinate detection period to scan column electrodes S1-S6 in order. A coordinate detecting circuit 7 detects the tip coordinates of a detection pen 6 on the basis of a voltage induced at the tip electrode of the detection pen with the scanning pulses. Thus, the (y) coordinate of the tip of the electronic pen 6 is detected in the display period and the (x) coordinate is detected in the (x)-coordinate detection period to make the display screen large-sized, increase the productivity, and reduce the cost, and also to improve the precision of the coordinate detection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display-integrated type tablet device having a display function used in a laptop computer, a word processor, etc., and a driving method thereof.

[0002]

2. Description of the Related Art Conventionally, there is a display unit-integrated type tablet device in which a display unit and a tablet are laminated and integrally configured. FIG. 5 shows a schematic structure of the electrostatic induction tablet used in the display unit-integrated tablet device and its drive unit. In the electrostatic induction tablet 21, column electrodes X ₁ , X ₂ , ..., X _m (hereinafter, any column electrode is referred to as X) are arranged in parallel and row electrodes Y ₁ , Y ₂ ,. , Y _n (hereinafter, an arbitrary row electrode is referred to as Y) are arranged in parallel with each other so that both electrodes are orthogonal to each other and fixed via a spacer (transparent adhesive or the like). Is formed. Each row electrode Y is connected to the row electrode shift register 22, while each column electrode X is connected to the column electrode shift register 23. At that time, the column electrodes X and the row electrodes Y are formed substantially transparent with indium oxide (ITO) or the like.

The row electrode shift register 22 and the column electrode shift register 23 are connected to a timing generation circuit 24. Further, the timing generation circuit 24 has x
The coordinate detection circuit 27 and the y coordinate detection circuit 28 are connected. The x-coordinate detection circuit 27 detects the x-coordinate of the tip of the electronic pen 25 based on the signal from the timing generation circuit 24 and the signal input from the electronic pen 25 through the operational amplifier 26, and the x-coordinate is detected. The x-coordinate signal representing is output. Similarly, the y-coordinate detection circuit 2
The reference numeral 8 outputs a y-coordinate signal representing the y-coordinate of the tip of the electronic pen 25.

The electrostatic induction tablet 21 thus constructed has a light transmittance of about 85%. Therefore,
Even if the electrostatic induction tablet 21 is laminated on the liquid crystal display, the display screen of the liquid crystal display can be seen through the electrostatic induction tablet 21. Therefore, as described above, the electrostatic induction tablet 21 is laminated on the liquid crystal display to form a display unit integrated tablet device, and the coordinates on the liquid crystal display can be pen-input by the electrostatic induction tablet 21 and the electronic pen 25. Of.

The electrostatic induction tablet 21 having the above structure and its drive unit operate as follows. That is, first, the timing generation circuit 24 is moved to the column electrode shift register 23.
The shift data and the clock signal are sent to. Then, the scanning pulse of the column electrode scanning signals x _{1 to} x _m as shown in FIG. 6 is sequentially applied from the column electrode shift register 23 to each column electrode X. Next, similarly, scanning pulses of the row electrode scanning signals y _{1 to} y _n as shown in FIG. 6 are sequentially applied from the row electrode shift register 22 to each row electrode Y. At that time, the electronic pen 25 is brought close to the surface of the electrostatic induction tablet 21. Then, since the tip electrode (not shown) of the electronic pen 25 and the column electrode X and the row electrode Y are coupled with each other by the stray capacitance, the tip electrode of the electronic pen 25 is as shown in FIG. Induced voltage is induced. Here, an operational amplifier 26 is connected to the tip electrode so that the input side impedance of the tip electrode of the electronic pen 25 is set higher than the lead wire side impedance.

The tip coordinates of the electronic pen 25 are detected in the following manner based on the induced voltage induced in the tip electrode. That is, the induced voltage signal having the waveform as shown in FIG. 7A output from the electronic pen 25 is passed through the low-pass filter and the amplifier, as shown in FIG.
The x-coordinate detection circuit 2 becomes a signal having a waveform as shown in (b).
7 or y coordinate detection circuit 28.

The x-coordinate detection circuit 27, based on the clock signal from the timing generation circuit 24 and the signal from the electronic pen 25, shifts from the column electrode shift register 23 to the column electrode X ₁ to the column electrode as shown in FIG. The time (Ts in FIG. 7B) from when the scanning pulse of the scanning signal x ₁ is applied and the scanning of the column electrode X is started until the peak of the waveform in the signal from the electronic pen 25 is input is measured. . Then, based on this measurement value, x representing the x coordinate of the tip of the electronic pen 25
Output the coordinate signal. Similarly, the y-coordinate detection circuit 28
Measures the time from when the scanning of the row electrode Y is started until the peak of the waveform in the signal from the electronic pen 25 is input. Then, based on this measured value, the electronic pen 25
It outputs a y-coordinate signal that represents the y-coordinate of the tip of the.
The time Ts at that time is measured by counting the number of pulses of the clock signal applied to the row electrode shift register 22 or the column electrode shift register 23.

As described above, the electrostatic induction tablet 2 is used.
Although No. 1 has a relatively simple structure, it can detect the tip coordinates of the electronic pen 25 with high accuracy, and is therefore widely used in small computers and the like.

The electrostatic induction tablet 21 and the liquid crystal display as described above are stacked to form the electrostatic induction tablet 21.
A tablet device integrated with a display unit for displaying picture elements on the liquid crystal display corresponding to the coordinates of the tip of the electronic pen 25 above is configured. This display-integrated type tablet device has the electrostatic induction tablet 21 at the tip of the electronic pen 25.
By displaying the characters and figures that have been pen-input by tracing the surface of the, on the display screen of the liquid crystal display, it is possible to input characters and figures as if writing on paper with a writing instrument such as a ballpoint pen.

However, the above-mentioned display-integrated type tablet device has the following drawbacks. First, while looking at the display screen of the liquid crystal display, the electronic pen 25
Thus, when tracing the surface of the electrostatic induction tablet 21, the display screen of the liquid crystal display is difficult to see.
That is, as described above, the column electrodes X and the row electrodes Y of the electrostatic induction tablet 21 are formed substantially transparent with tin oxide, indium oxide, or the like on a transparent substrate such as glass or plastic. However, the light transmittance of the electrode thus formed is about 85%, which is not so high as compared with the light transmittance of the substrate and is cloudy. The electrodes are regularly arranged in a grid pattern. Therefore, the electrodes X ₁ , X ₂ , ..., X _m , Y ₁ , Y ₂ , ..., Y _n of the electrostatic induction tablet 21 stand out unexpectedly. This phenomenon is particularly remarkable in a simple display unit integrated tablet having no backlight.

The electrodes X ₁ , X ₂ , ..., X _m , of the electrostatic induction tablet 21 are displayed on the display screen of the liquid crystal display.
The area covered by Y ₁ , Y ₂ , ..., Y _n is relatively large.
As a result, the display screen of the liquid crystal display becomes dark and the contrast becomes low.

Further, since the liquid crystal display and the electrostatic induction tablet 21 are separately configured, when the liquid crystal display and the electrostatic induction tablet 21 are laminated and assembled together, the liquid crystal display and the electrostatic induction tablet 21 are integrated. The position corresponding to the tablet 21 may shift. In this case, the position on the liquid crystal display that is pen-input (the position designated by the tip of the electronic pen 25) and the position of the pixel displayed on the display screen of the liquid crystal display are displaced by this pen-input. Therefore, it is impossible to input characters and figures as if writing on paper with a writing instrument such as a ballpoint pen.

Further, since the liquid crystal display and the electrostatic induction tablet 21 which are separately formed are integrally laminated, the resulting display unit integrated tablet becomes thick and heavy. Therefore, it is a great obstacle to the miniaturization of small computers and word processors desired by consumers. It also causes a cost increase.

Therefore, the following display device with a tablet function has been proposed. First, the first display device with a tablet function has an electronic pen that is capacitively coupled to the row electrodes and column electrodes of the active matrix liquid crystal panel. Then, the driving period of the active matrix liquid crystal panel is divided into a display period and a coordinate detection period, and during the coordinate detection period, a scanning pulse having a voltage that does not affect the display is sequentially applied to the row electrodes and the column electrodes so that both electrodes are applied. Scan sequentially. Then, at that time, the voltage induced in the electronic pen is detected, and the tip coordinates of the electronic pen are detected based on the scanning timing of the both electrodes.

Further, in the second display device with a tablet function, row electrodes and column electrodes for display and column electrodes for coordinate detection are arranged, and a switching element is arranged at an intersection position of the display column electrode and the row electrode. A display pixel electrode connected to both electrodes via a pixel is provided at the intersection of the column electrode and the row electrode for coordinate detection, and a pixel for coordinate detection connected to both electrodes via a switching element. It has an active matrix liquid crystal panel provided with electrodes. The electronic pen is electrostatically coupled to the coordinate detection picture element electrodes of the active matrix liquid crystal panel. The tablet function display device includes the coordinate detection column electrodes of the active matrix liquid crystal panel. The row electrodes are sequentially scanned to accumulate charges in the coordinate detection picture element electrodes, the charges are detected by the electronic pen, and the tip coordinates of the electronic pen are detected based on the scanning timing of both electrodes. .

[0016]

However, each of the above-mentioned display devices with tablet functions has the following problems. First, in the first display device with a tablet function, one frame period is divided into a display period and a coordinate detection period, and the tip coordinates of the electronic pen are detected during this coordinate detection period.
Even if the display panel has a large area and the number of row electrodes and column electrodes is large, the coordinate detection period cannot be long in order to secure a display period of a predetermined length. Therefore, there is a problem that the electrode scanning speed is inevitably increased and the tip coordinate detection accuracy of the electronic pen is reduced.

Further, in the coordinate detection period, in order to prevent the TFT (thin film transistor) from turning on and the voltage applied to the liquid crystal changing, the reverse polarity of the scanning pulse sequentially applied to the row electrodes during the display period is applied. It is necessary to scan with a scan pulse. Therefore, it is necessary to add a function of generating a scan pulse having a reverse polarity of the display period in the coordinate detection period to the row electrode scanning circuit of a normal active matrix liquid crystal display panel, which makes the row electrode scanning circuit complicated. There is also a problem.

On the other hand, in the second display device with tablet function, it is necessary to provide the active matrix liquid crystal display panel with the display column electrodes and picture element electrodes and the coordinate detection column electrodes and picture element electrodes. Therefore, there is a problem in that the structure of the active matrix liquid crystal display panel becomes complicated, resulting in reduced productivity and increased cost.

Of the picture element electrodes in the active matrix liquid crystal display panel, the picture element electrodes that actually control image display are only picture element electrodes for display. Therefore, the panel aperture ratio (the ratio of the area of the display pixel electrode that actually contributes to image display to the area of the panel display surface) is reduced. Therefore, there is also a problem that the quality of image display is degraded.

Therefore, an object of the present invention is to provide an active matrix type display-integrated tablet device with a high coordinate detection accuracy and a method of driving the same, which can easily achieve a large-sized display screen, high productivity and low cost. Especially.

[0021]

In order to achieve the above object, the first invention is to provide a pair of transparent substrates in which electro-optical substances are sandwiched so as to face each other, and to form a matrix on one of the transparent substrates. A plurality of arranged pixel electrodes, a plurality of switching elements connected to the respective pixel electrodes, a plurality of first electrodes and a second electrode connected to the respective switching elements
Display-integrated tablet device having electrodes, first electrode driving means and second electrode driving means for driving each of the first and second electrodes, and input pen means electrostatically coupled to the first and second electrodes In the electro-optical material driving period, the first and second electrodes are driven by the first and second electrode driving means to selectively operate each of the switching elements to write an image on the electro-optical material. A first position detecting means for detecting first position information indicating an input position by the input pen means based on a signal from the input pen means when the first electrode is driven; and the electro-optical substance. Outside the driving period, the second electrode driving means drives the second electrode.
It is characterized by further comprising second position detecting means for detecting second position information indicating the input position by the input pen means based on a signal from the input pen means when the electrodes are driven.

According to a second invention, in the display-integrated tablet device according to the first invention, the first electrode is a row electrode, the second electrode is a column electrode, and the first electrode driving means is The second electrode driving means is a row electrode driving means, and the second electrode driving means is a column electrode driving means.

Further, the display-integrated type tablet device of the third invention has a plurality of row electrodes arranged in parallel on the transparent substrate and a plurality of column electrodes orthogonal to the row electrodes, and the row electrodes have control terminals. On the other hand, each pixel has an input terminal connected to the column electrode and a plurality of switching elements arranged on the transparent substrate at the intersection of the electrodes, and connected to the output terminals of all the switching elements. An active matrix type display panel having a counter electrode on a substrate facing an electrode with an electro-optical material layer sandwiched therebetween, and an electronic pen having an electrode electrostatically coupled to a row electrode and a column electrode of the display panel at the tip. A display control circuit for outputting a display control signal and display data for displaying an image on a pixel matrix composed of a plurality of pixel electrode regions in the display panel, A detection control circuit that outputs a scan control signal for scanning the column electrodes of the display panel, and a display control signal and display data from the display control circuit that are selected by switching the display control circuit side in the display period. On the other hand, in the x-coordinate detection period, a switching circuit for switching and selecting the detection control circuit side and outputting a scanning control signal from the detection control circuit, and a row for sequentially scanning the row electrodes in the display period. A row electrode drive circuit that generates an electrode scanning signal based on a display control signal from the display control circuit, and an image display charge is applied to each pixel electrode connected to the row electrode being scanned during the display period. A column electrode drive signal for giving is generated based on the display control signal and display data from the switching circuit, while the column electrodes are sequentially scanned during the x coordinate detection period. And a column electrode drive circuit that generates a column electrode scan signal based on a scan control signal from the switching circuit, and a row electrode scan signal that is input from the row electrode drive circuit to each row electrode during the display period. The y-coordinate of the tip of the electronic pen is detected on the basis of the voltage induced in the electrode of the electronic pen, while the column electrode scanning input from the column electrode drive circuit to each column electrode is detected during the x coordinate detection period. A coordinate detection circuit for detecting the x coordinate of the tip of the electronic pen based on the voltage induced in the electrode of the electronic pen due to the signal is provided.

Further, a fourth invention is characterized in that in the display-integrated type tablet device according to any one of the first to third inventions, the electro-optical substance is a liquid crystal.

The fifth aspect of the present invention is to drive one of the first and second electrodes by the first and second electrode driving means so that one of the pair of transparent substrates facing each other and having the electro-optical substance sandwiched therebetween. An electro-optical device in which each switching element connected to a plurality of pixel electrodes arranged in a matrix is selectively operated to write an image on the electro-optical material, and an image is written on the electro-optical material. During the material driving period, the first position information indicating the input position by the input pen means is detected based on the signal from the input pen means that is electrostatically coupled to the first electrode when the first electrode is driven. Then, outside the electro-optical material driving period, the input is made based on a signal from the input pen means that is electrostatically coupled to the second electrode when the second electrode is driven by the second electrode driving means. Pen means It is characterized by detecting a second position information representing an input position by.

A sixth invention is the method for driving a display-integrated type tablet device according to the fifth invention, wherein the first electrode is a row electrode, the second electrode is a column electrode, and the first electrode is The driving means is a row electrode driving means, and the second electrode driving means is a column electrode driving means.

According to a seventh aspect of the present invention, there is provided a method of driving a display-integrated type tablet device, wherein row electrode scanning signals generated based on a display control signal are sequentially input to row electrodes of an active matrix type display panel. While scanning the electrodes, the column electrode drive signal generated based on the display control signal and the display data is input to the column electrodes of the display panel to form a matrix on one of the transparent substrates facing each other of the display panel. By selectively driving the arranged switching elements to write an image on the electro-optical material sandwiched between the transparent substrates of the display panel, and during each display period during which the image is written on the electro-optical material, each row Based on the voltage induced in the electrode of the electronic pen that is electrostatically coupled to each row electrode due to the row electrode scanning signal input to the electrode, the tip of the electronic pen Detecting the coordinates, the display period out of the x
During the coordinate detection period, the column electrode scan signal generated based on the scan control signal is sequentially input to the column electrodes of the display panel to scan the column electrodes, and the column electrode scan signals input to the column electrodes. The x-coordinate of the tip of the electronic pen is detected based on the voltage induced in the electrode of the electronic pen due to.

The eighth invention is characterized in that, in the method for driving the display-integrated type tablet device according to any one of the fifth to seventh inventions, the electro-optical substance is a liquid crystal.

[0029]

In the first invention, during the electro-optical material driving period,
The first and second electrodes are driven by the first and second electrode driving means to selectively operate each switching element, and an image is displayed on the electro-optical material sandwiched between the pair of transparent substrates facing each other. Written. At that time, the first position detecting means detects the first position information indicating the input position by the input pen means based on the signal from the input pen means when the first electrode is driven. On the other hand, outside the electro-optical substance driving period, the second electrode is driven by the second electrode driving means, and based on a signal from the input pen means at that time, the second position detecting means is operated by the second position detecting means. The second position information indicating the input position is detected.

Thus, since the first position information of the input position by the input pen means is detected during the electro-optical material driving period, the first position information is detected outside the electro-optical material driving period.
It is not necessary to set the detection period for position information, and the first and second position information representing the input position by the input pen means is detected without increasing the position detection speed.

Further, in the second invention, during the electro-optical material driving period, the row electrodes are driven by the row electrode driving means, while the column electrodes are driven by the column electrode driving means to selectively switch each switching element. Be operated. Then, an image is written on the electro-optical material sandwiched between the pair of transparent substrates facing each other. At that time, the first position detecting means detects the first position information indicating the input position by the input pen means based on the signal from the input pen means when the row electrode is driven. Further, outside the electro-optical substance driving period, the column electrode driving means drives the column electrodes, and the second position detecting means determines the input position based on a signal from the input pen means at that time. The represented second position information is detected.

In the third aspect, the display control circuit side is switched and selected by the switching circuit and the display period starts. Then, the row electrode drive circuit generates a row electrode scanning signal based on the display control signal from the display control circuit. On the other hand, the column electrode drive circuit generates a column electrode drive signal based on the display control signal and the display data from the switching circuit. Thus, based on the generated row electrode scanning signal and column electrode drive signal,
An image is displayed by applying a voltage according to the display data to each picture element in the row selected by sequentially scanning the picture element matrix of the display panel.

At this time, a voltage is induced in the electrode of the electronic pen due to the row electrode scanning signal input to the row electrode. Then, the voltage induced in the electrode of the electronic pen is input to the coordinate detection circuit, and the y coordinate of the tip of the electronic pen is detected based on the input voltage.

That is, during the display period, an image is displayed on the display panel and the y coordinate of the tip of the electronic pen on the display panel is detected.

Next, the detection control circuit side is switched and selected by the switching circuit, and the x coordinate detection period starts. Then, the column electrode scanning signal generated by the column electrode driving circuit based on the detection control signal from the switching circuit is input to each of the column electrodes, and the column electrodes are sequentially scanned. As a result, a voltage is induced in the electrode of the electronic pen due to the column electrode scanning signal input to the column electrode. In this way, the voltage induced in the electrode of the electronic pen is input to the coordinate detection circuit, and the x coordinate of the tip of the electronic pen is detected based on the input voltage.

That is, during the x coordinate detection period, the x coordinate of the tip of the electronic pen on the display panel is detected.

According to the fourth aspect of the invention, during the liquid crystal driving period in which an image is written in the liquid crystal sandwiched between the pair of transparent substrates facing each other, based on the signal from the input pen means,
The first position detecting means detects the first position information indicating the input position by the input pen means. Further, outside the liquid crystal driving period, the second position information indicating the input position is detected by the second position detecting means based on the signal from the input pen means.

[0038]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a block diagram of a display-integrated type tablet device of this embodiment. This display-integrated type tablet device includes an active matrix type liquid crystal display panel (hereinafter, simply referred to as a display panel) 1 having both an image display function and an electrostatic induction tablet function, and a row electrode drive for driving the display panel 1. Circuit 2 and column electrode drive circuit 3
A display control circuit 4 for supplying a display control signal to the row electrode drive circuit 2 and the column electrode drive circuit 3, and a column electrode drive circuit 3
A detection control circuit 5 for supplying a detection control signal to the display, a coordinate detection circuit 7 for receiving a signal from the electronic pen 6 to detect the tip coordinates of the electronic pen 6 on the display panel 1, a switching circuit 8 and a coordinate detection circuit 7. Is configured by a control circuit 9 for controlling the image display operation and the coordinate detection operation.

The display panel 1 is a transparent TFT substrate 1
, A plurality of row electrodes G1, G2, G3, ...
G6 (hereinafter, an arbitrary row electrode is referred to as G) and a plurality of column electrodes S1, which are arranged in parallel at right angles to the group of row electrodes G1,
, S6 (hereinafter, any column electrode is referred to as S). The TFTs 11 are arranged at the intersections of the row electrodes G and the column electrodes S. The row electrodes G are connected to the gate electrodes of the TFTs 11 while the column electrodes S are connected to the source electrodes. The pixel electrode 12 is connected to the drain electrode of the TFT 11. The picture element electrodes 12 are arranged in a matrix in a region surrounded by the row electrodes G and the column electrodes S.

This TF is formed on the back surface of the TFT substrate 10.
A counter substrate 13 is arranged to face the T substrate 10, and a counter electrode 14 having substantially the same area as the TFT substrate 10 is arranged on the inner surface of the counter substrate 13. Liquid crystal is sandwiched between each picture element electrode 12 and the counter electrode 13 to form a picture element matrix. A bias voltage is supplied to the counter electrode 14 by a power supply circuit 16 and a counter electrode drive circuit 15.

The row electrode drive circuit 2 has row electrode scanning signals g1 to g6 (hereinafter, an arbitrary row electrode scanning signal will be referred to as g).
The scanning pulse of 1 is sequentially applied to each row electrode G on the display panel 1 to scan the row electrode G. Then, a scanning pulse is applied to the gate electrode of the TFT 11 via the row electrode G,
The TFT 11 turns on. The column electrode drive circuit 3 in synchronization with the scanning of the row electrodes G, the column electrode driving signals s ₁ 1 to s ₁ 6 with a driving pulse corresponding to the display contents of the picture elements of each row electrode G (hereinafter, An arbitrary column electrode drive signal is described as s ₁ ) is applied to the column electrode S. Then, a drive pulse is applied to the source electrode of the TFT 11 via the column electrode S, and the row electrode G by the row electrode drive circuit 2 is applied as described above.
The signal voltage is applied to the pixel electrode 12 connected to the drain electrode of the TFT 11 which is turned "on" by the scanning. In this way, the image is written in the picture element according to the display content.

Further, the column electrode driving circuit 3, independently of the scanning of the row electrodes G, the column electrode scanning signal s ₂ 1 to s ₂ 6
A scanning pulse (hereinafter, an arbitrary column electrode scanning signal is described as s ₂ ) is sequentially applied to each column electrode S to scan the column electrode S. The scan pulse generated by the row electrode drive circuit 2 and the drive pulse and scan pulse generated by the column electrode drive circuit 3 are generated by the bias voltage from the power supply circuit 16.

The display control circuit 4 displays the display panel 1 on the basis of a display data signal and a synchronizing signal input from the outside.
A display control signal for displaying an image is generated. Then, the generated display control signal is sent to the row electrode drive circuit 2 to control the operation of the row electrode drive circuit 2. Further, the display control signal and the input display data signal are sent to the switching circuit 8. On the other hand, the detection control circuit 5 generates a detection control signal for detecting the tip coordinates of the electronic pen 6 based on the synchronization signal and sends it to the switching circuit 8. The switching circuit 8 switches and selects the display control signal and the display data signal from the display control circuit 4 or the detection control signal from the detection control signal 5 based on the switching signal from the control circuit 9 to drive the column electrode. It is sent to the circuit 3.
In this way, the operation of the column electrode drive circuit 3 is controlled by the display control signal or the detection control signal.

The electronic pen 6 has a detection electrode (not shown) having a high input impedance, which is coupled to the row electrode G and the column electrode S on the display panel 1 by a floating capacitance, and has a tip.
An induced voltage is induced in the detection electrodes due to the scanning pulse applied to the row electrode G or the scanning pulse applied to the column electrode S. The coordinate detection circuit 7 detects the generation timing of the induced voltage generated in the detection electrode of the electronic pen 6 based on the coordinate detection timing signal from the control circuit 9, and detects the tip coordinate of the electronic pen 6.

FIG. 2 shows the positional relationship between the display panel 1 and the electronic pen 6. However, FIG. 2 (a) is a front perspective view,
FIG. 2B is a sectional view. The electronic pen 6 is located on the TFT substrate 10 side of the display panel 1, and is coupled to the tip electrode of the electronic pen 6 and the row electrode G and the column electrode S on the TFT substrate 10 by a stray capacitance. In this way, the electronic pen 6
T on the side opposite to the backlight 17 with the counter electrode 14 in between.
By positioning it on the FT substrate 10 side, high-frequency noise from the backlight 17 is shielded by the counter electrode 14, and the noise from the backlight 17 is superimposed on the induced voltage induced in the tip electrode of the electronic pen 6. To prevent. Further, the capacitive coupling between the tip electrode of the electronic pen 6 and the row electrode G and the column electrode S is not blocked by the counter electrode 14 and the induced voltage induced in the tip electrode of the electronic pen 6 does not decrease. Therefore, the coordinates of the tip of the electronic pen 6 on the display panel 1 can be detected accurately and stably.

In FIG. 1, when the coordinate detecting circuit 7 detects the coordinate of the tip of the electronic pen 6, the coordinate detecting circuit 7 outputs an x coordinate signal and ay coordinate signal representing the coordinate of the tip. The display data signal for displaying the point image at the tip position of the electronic pen 6 on the display panel 1 based on the x-coordinate signal and the y-coordinate signal is the display data signal generating means (which is directly related to the present embodiment). (Not shown in the figure), and is input to the display control circuit 4 as described above. As a result, the switching operation of the switching circuit 8 based on the control of the control circuit 9 and the display control circuit 4,
By the operation of the row electrode drive circuit 2 and the column electrode drive circuit 3, a dot image is displayed on the display panel 1 at the tip position of the electronic pen 6.

In this way, characters, symbols and pictures can be written on the display panel 1 by the electronic pen 6 as if we were writing on paper with a writing instrument. At the same time, an input character or an input symbol can be recognized by a recognition means (not shown) from the changes in the x-coordinate signal and the y-coordinate signal, and the recognition result can be used to create a document or control instructions. Of course, it can also be used as a response means to the icon displayed on the display panel 1.

FIG. 3 is a diagram showing operation timings of the display-integrated tablet device. One cycle Tv of the vertical synchronizing signal V, which is one of the synchronizing signals, is one screen display period (y
(Coordinate detection period) T1 and x coordinate detection period T2, and the x coordinate detection period T2 is a vertical blanking period Tb.
Is equal to. The division into the detection period (y-coordinate detection period) T1 and the x-coordinate detection period T2 is performed by the display control circuit 4 or the detection control circuit 5 by the switching circuit 8.
It is carried out by switching selection between and.

In the display period (y-coordinate detection period) T1, the display control circuit 4 side is switched and selected by the switching circuit 8 based on the switching signal from the control circuit 9, and the display control signal from the display control circuit 4 is selected. The row electrode drive circuit 2 and the column electrode drive circuit 3 are controlled. Then, as described above, the row electrode scanning circuit g outputs the row electrode scanning signal g to scan / select the row electrode G on the display panel 1. On the other hand, the column electrode drive circuit 3 outputs a column electrode drive signal s ₁ according to the display data signal and applies it to the column electrode S. In this way, one screen image is displayed on the display panel 1.

On the other hand, during the x coordinate detection period T2, the detection control circuit 5 side is switched and selected by the switching circuit 8 and the column electrode drive circuit 3 is controlled by the detection control signal from the detection control circuit 5. . Then, the column electrode drive signal 3 outputs the column electrode scanning signal s ₂ ,
The column electrodes S of the display panel 1 are scanned.

The x-coordinate of the tip of the detection pen 6 is determined by detecting the application timing of the scanning pulse sequentially applied to the column electrodes S on the display panel 1 by the column electrode drive circuit 3 in the x-coordinate detection period T2. It is detected by detecting with the tip electrode. On the other hand, the y coordinate of the tip of the detection pen 6 is determined by the tip electrode of the detection pen 6 at the application timing of the scanning pulse sequentially applied to the row electrode G by the row electrode drive circuit 2 during the display period (y coordinate detection period) T1. It is detected by detecting.

That is, in this embodiment, the row electrode scanning pulse for coordinate detection is also used as the row electrode scanning pulse for image display. By doing so, the entire vertical blanking period Tb can be applied to the x-coordinate detection, and it is possible to prevent the increase in the electrode scanning speed and improve the x-coordinate detection accuracy. Since the y-coordinate detection is performed during the display period T1 longer than the vertical blanking period Tb, the y-coordinate detection accuracy can be improved.

FIG. 4 is a timing chart of various signals in the operation of the display-integrated type tablet device. The operation of the display-integrated tablet device will be described in detail below with reference to FIG.

The synchronizing signals input to the display control circuit 4, the detection control circuit 5, and the control circuit 10 include the horizontal synchronizing signal H in addition to the vertical synchronizing signal V. Vertical sync signal V
Has a cycle corresponding to one screen display period, and the horizontal synchronizing signal H has a cycle corresponding to one horizontal screen display period.
Further, in this embodiment, eight cycles of the horizontal synchronizing signal H correspond to one cycle of the vertical synchronizing signal V. Six of the eight horizontal synchronizing signals H are allocated to the display period (y coordinate detection period) T1, and the remaining two cycles are allocated to the x coordinate detection period T2.

In the display period (y-coordinate detection period) T1, the row electrode drive circuit 2 synchronizes with one cycle of the horizontal synchronizing signal H and outputs the scanning pulse of the row electrode scanning signal g as described above. Sequentially applied to G. In the display-integrated type tablet device according to the present embodiment, the scanning pulse sequentially applied to the row electrode G is used as the scanning pulse for image display and the scanning pulse for y coordinate detection.

On the other hand, the column electrode drive circuit 3 operates in the display period.
In (y coordinate detection period) T1, in synchronization with one cycle of the horizontal synchronizing signal H, the driving pulse corresponding to the display data is operated in the same manner as the normal active matrix type liquid crystal display panel as described above. The inserted column electrode drive signal s ₁ is output to all column electrodes S. However, in FIG. 4, the drive pulse is omitted. The aforementioned x-coordinate detection period T2, every period of the horizontal synchronizing signal H, sequentially applies a scan pulse of the column electrode scanning signal s ₂ to the three column electrodes S, in two cycles of the horizontal synchronizing signal H All the column electrodes S are sequentially scanned. In the display-integrated type tablet device in this embodiment, the scanning pulse sequentially applied to the column electrode S is used as the scanning pulse for detecting the x coordinate.

In order to prevent the deterioration of the liquid crystal, it is necessary to control the molecular alignment by an AC voltage. Therefore, in this embodiment, a method is used in which the voltage of the counter electrode 14 is kept constant and the polarity of the voltage applied to the picture element electrodes 12 forming each picture element of the picture element matrix is inverted with respect to the voltage of the counter electrode 14. adopt. Therefore, the column electrode drive circuit 3
That is, the level of the reference voltage of the column electrode drive signal s ₁ output from is inverted every frame. As a result, as shown in the bottom of FIG.
The potential level of the pixel electrode 12 connected via the pixel electrode 12 is inverted every time a scanning pulse is applied to the row electrode G, and the polarity with respect to the potential of the counter electrode 14 is inverted.

As described above, in this embodiment, the active matrix type liquid crystal display device is roughly constituted by the display panel 1, the row electrode drive circuit 2, the column electrode drive circuit 3, the display control circuit 4 and the power supply circuit 16. Further, a detection control circuit 5, a switching circuit 8, a coordinate detection circuit 7, a control circuit 9 and an electronic pen 6 are added. An image is displayed in the pixel matrix of the display panel 1 during each frame period, and a display period (y coordinate detection period) T1 for detecting the y coordinate of the tip of the electronic pen 6 on the display panel 1 and the display panel The time is divided into an x-coordinate detection period T2 in which the x-coordinate of the tip of the electronic pen 6 on 1 is detected.

Then, the display period (y coordinate detection period) T
In 1, the switching circuit 8 selects the display control circuit 4 side under the control of the control circuit 9. Then, the row electrode driving circuit 2 sequentially scans and selects the row electrode G, while the column electrode driving circuit 3 drives the column electrode S, and the pixel corresponding to the selected row electrode G is displayed according to the display data. Displayed images. At that time, the coordinate detection circuit 7 uses the induced voltage induced on the tip electrode of the electronic pen 6 due to the scanning pulse of the row electrode scanning signal g output from the row electrode driving circuit 2 to the row electrode G. Y at the tip of the electronic pen 6
Coordinates are detected accurately and stably.

On the other hand, during the x coordinate detection period T2, the switching circuit 8 selects the detection control circuit 6 side under the control of the control circuit 9. Then, the column electrode drive circuit 3 sequentially applies the scanning pulse of the column electrode scanning signal s ₂ to the column electrodes S of the display panel 1, and the column electrodes S are sequentially scanned. Then, an induced voltage is induced in the tip electrode of the electronic pen 6, and the coordinate detection circuit 7 detects the x coordinate of the tip of the electronic pen 6 based on the induced voltage and outputs an x coordinate signal.

As described above, the display panel 1 is used as the image display section and the y-coordinate detection tablet in the display period (y-coordinate detection period) T1, while the display panel 1 is used in the x-coordinate detection period T2. By using the display panel 1 as a detection tablet, the display panel 1 functions as a tablet having an integrated display function.

Therefore, according to the present embodiment, the low light transmittance of the row / column electrodes of the tablet lowers the brightness and contrast of the display screen of the display unit, the regularity of the electrode arrangement of the tablet, the display unit and the tablet unit. It is possible to solve problems such as a reduction in the visibility of the display unit due to a shift in the location corresponding to, a thicker product due to stacking the tablet and the display unit, and an increase in cost. That is, the display-integrated tablet of the present embodiment is easy to see the display screen when the position on the display screen is input by the pen, and it is easy to reduce the thickness and cost.

Further, in the present embodiment, the above display period
(y coordinate detection period) The y coordinate of the tip of the display pen 6 on the display panel 1 is detected during T1, and the x coordinate is detected during the x coordinate detection period T2.
Since the coordinates are detected, the entire one frame period can be used as the coordinate detection period. Therefore, the coordinate detection speed can be reduced and the tip coordinates of the display pen 6 can be detected accurately and stably. Therefore, even if the number of the row electrodes G and the column electrodes S increases with the increase in the area of the display panel, it can be sufficiently dealt with.

Further, in this embodiment, the y coordinate of the tip of the electronic pen 6 is detected by using the scanning pulse applied to the row electrode G during the scanning of the row electrode in the display period T1. Therefore, when detecting the y coordinate, the TFT1
A special scanning pulse that prevents 1 from turning "on" is applied to the row electrode G.
Need not be applied to. Furthermore, when detecting the x coordinate, T
Since the FT 11 is “off”, even if a scan pulse is applied to the column electrode S, the charge accumulated in the pixel electrode 12 does not change,
The display quality is not lost.

Further, in the above-mentioned embodiment, by adding the recognition means for input characters and figures, the characters and figures inputted by the pen are recognized by the recognition means, and various processings are carried out using the recognition result. It is also possible to do so.
Alternatively, by adding an instruction judging means, the contents of the processing menu instructed by the electronic pen among various processing menus (so-called icons) displayed on the liquid crystal panel 1 are judged, and the processing according to the judgment result is executed. It is also possible to do so.

Therefore, if the CPU (central processing unit) provided on the back surface of the display panel 1 constitutes the above-mentioned recognizing means, instruction judging means and other processing means, the key input by the keyboard is changed. It becomes possible to realize an extremely thin compact computer using pen input

In the above embodiment, the display panel 1 having six row electrodes G and six column electrodes S is taken as an example for simplification of description. However, the actual display panel 1 includes, for example, 480 row electrodes G and 640 column electrodes S.

[0068]

As is apparent from the above, the display-integrated tablet device of the first invention is a pair of transparent substrates in which an electro-optical material is sandwiched, and a switching element provided on one of the transparent substrates. Connected picture element electrodes, first electrodes connected to the switching elements, first and second electrode driving means for driving the second electrodes, and input pen means for electrostatically coupling with the first and second electrodes. First position detecting means for detecting first position information indicating an input position by the input pen means during an electro-optical substance driving period for writing an image on the electro-optical substance in the display-integrated tablet device having: Since the second position detecting means for detecting the second position information indicating the input position is provided outside the electro-optical material driving period, the input position by the input pen means is particularly provided outside the electro-optical material driving period. First position It is not necessary to set the detection period for detecting information.

Therefore, it is possible to secure a sufficient length of the electro-optical material driving period, and it is possible to easily increase the size of the display screen. Further, the detection speed when detecting the position information can be set low, and the detection accuracy of the position information can be increased. Further, since the first electrode driving means does not need to generate a special signal for driving the first electrode, the structure of the first electrode driving means is simplified, the productivity is improved, and the cost is reduced. it can.

In the display-integrated type tablet device according to the second invention, the first electrode is a row electrode, the second electrode is a column electrode, and the first electrode driving means is a row electrode driving means. Since the second electrode driving means is constituted by the column electrode driving means, a pair of transparent substrates in which the electro-optical material is sandwiched,
The pixel electrodes provided on one transparent substrate and connected to the switching elements form an active matrix type display panel. Therefore, the position information of the input position by the input pen means can be easily and surely detected.

Further, the display-integrated type tablet device of the third invention is generated by the row electrode drive circuit in accordance with the signal from the display control circuit during the display period in which the display control circuit side is switched and selected by the switching circuit. A row electrode of an active matrix type display panel is sequentially scanned and selected based on a row electrode scanning signal, and display is performed based on a column electrode drive signal generated by a column electrode drive circuit in a pixel element associated with the selected row electrode. Display an image according to the data. At that time, the y-coordinate of the tip of the electronic pen is detected by the coordinate detection circuit based on the voltage induced in the electrode of the electronic pen due to the row electrode scanning signal applied to the row electrode of the display panel.

On the other hand, in the x-coordinate detection period in which the detection control circuit side is switched and selected by the switching circuit, according to the signal from the detection control circuit, based on the column electrode scanning signal generated by the column electrode driving circuit, The column electrodes of the display panel are sequentially scanned, and the x-coordinate of the tip of the electronic pen is detected by the coordinate detection circuit based on the voltage induced in the electrode of the electronic pen due to the column electrode scanning signal applied to the column electrode. To detect.

As described above, since the y coordinate of the tip of the electronic pen is detected during the display period and the x coordinate is detected during the x coordinate detection period, the row electrode scanning speed and the column electrode scanning speed can be reduced. Therefore, according to the present invention, even if the number of row electrodes and column electrodes increases with the increase in the area of the display panel, the coordinate detection operation can be stably and surely performed, and the coordinate detection accuracy that facilitates the increase of the area can be increased. It is possible to provide a high-performance active matrix type display-integrated tablet device. In addition, since it is not necessary to generate a special scanning pulse or to provide a pixel electrode for coordinate detection so as not to “turn on” the switching element at the time of scanning the row electrode, a normal active matrix type liquid crystal display device is used. Available. Therefore, it is possible to prevent a decrease in productivity and an increase in cost.

Further, in the display-integrated type tablet device of the fourth invention, since the electro-optical substance is made of liquid crystal, the cost can be reduced by using the normally used active matrix type liquid crystal display panel. be able to.

Further, the driving method of the display-integrated type tablet device according to the fifth aspect of the invention is to drive the first and second electrodes by the first and second electrode driving means to make a plurality of picture elements arranged in a matrix. Each switching element connected to the electrode is selectively operated to write an image on the electro-optical material, and the input position by the input pen means is changed during the electro-optical material driving period when the image is written on the electro-optical material. Since the first position information indicating the input position is detected and the second position information indicating the input position is detected outside the electro-optical substance driving period, the input position by the input pen means is particularly detected outside the electro-optical substance driving period. It is not necessary to set the detection period for detecting the first position information.

Therefore, the display screen of the display-integrated type tablet device can be easily increased in size, the detection accuracy of the input position information by the input pen means can be increased, and the productivity and the cost can be reduced. it can.

According to a sixth aspect of the present invention, there is provided a method of driving a display-integrated type tablet device, wherein the first electrode is a row electrode, the second electrode is a column electrode, and the first electrode driving means is a row electrode. Since the second electrode driving means is constituted by the electrode driving means, and the second electrode driving means is constituted by the column electrode driving means, the position information of the position inputted by the input pen means on the active matrix type display panel in which the electro-optical substance is inserted. Can be detected easily and reliably.

According to a seventh aspect of the present invention, there is provided a method for driving a display-integrated type tablet device, wherein a row electrode scanning signal is sequentially input to row electrodes of an active matrix type display panel to scan the row electrodes while driving the column electrodes. A signal is input to a column electrode of a display panel to write an image on the electro-optical material in the display panel, and a row electrode scanning signal input to each row electrode is input during a display period when an image is written on the electro-optical material. Due to this, the y-coordinate of the tip of the electronic pen is detected based on the voltage induced in the electrode of the electronic pen that is electrostatically coupled to each row electrode, and the column electrode is detected during the x-coordinate detection period outside the display period. A scan signal is sequentially input to the column electrodes of the display panel to scan the column electrodes, based on the voltage induced in the electrodes of the electronic pen due to the column electrode scan signals input to the column electrodes. Since to detect the x-coordinate of the tip of the serial electronic pen, it can slow down the row electrode scanning speed and the column electrode scanning speed.

Therefore, according to the present invention, the coordinate detecting operation can be stably and reliably performed even in the display panel in which the number of the row electrodes and the column electrodes is increased with the increase in the area, and the coordinate detecting accuracy is improved. Can be increased. Further, according to the present invention, since it is not necessary to generate a special scanning pulse or to provide a pixel electrode for coordinate detection so as not to turn “on” the switching element at the time of scanning the row electrode, a normal active matrix This makes it possible to realize a high-productivity and low-cost display-integrated tablet device that uses a display device of the system.

In the driving method for the display-integrated type tablet device according to the eighth aspect of the invention, since the electro-optical substance is liquid crystal, the first position information indicating the input position by the input pen means is supplied during the electro-optical substance driving period. It is possible to easily realize a low-cost tablet device with a display that can be detected.

[Brief description of drawings]

FIG. 1 is a block diagram of a display-integrated tablet device according to the present invention.

FIG. 2 is a diagram showing a positional relationship between a display panel and an electronic pen in FIG.

FIG. 3 is a diagram showing an operation timing of the display-integrated type tablet device shown in FIG. 1.

FIG. 4 is a timing chart of various signals in the operation of the display-integrated type tablet device shown in FIG.

FIG. 5 is a diagram showing a schematic structure of an electrostatic induction tablet and a drive unit thereof.

6 is a timing chart of electrode scanning signals output from the row electrode shift register and the column electrode shift register in FIG.

7A and 7B are diagrams showing a voltage waveform induced in the electronic pen in FIG. 5 and a molding waveform thereof.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Display panel, 2 ... Row electrode drive circuit, 3 ... Column electrode drive circuit, 4 ... Display control circuit, 5 ... Detection control circuit, 6 ... Electronic pen, 7 ... Coordinate detection circuit, 8 ... Switching circuit, 9 ... Control Circuit, 10 ... TFT
Substrate, 11 ... TFT, 13 ... Counter substrate, 14 ... Counter electrode, 15 ... Counter electrode drive circuit.

Claims (8)

[Claims] 1. A pair of transparent substrates in which an electro-optical material is sandwiched so as to face each other, a plurality of pixel electrodes arranged in a matrix on one of the transparent substrates, and connected to each of the pixel electrodes. Plural switching elements, plural first electrodes and second electrodes connected to the respective switching elements, and first electrode driving means and second electrode driving means for driving each of the first and second electrodes. And a display-integrated tablet device having an input pen means electrostatically coupled to the first and second electrodes, wherein the first and second electrodes are driven by the first and second electrode driving means to perform the switching operations. The input pen means is driven based on a signal from the input pen means when the first electrode is driven during an electro-optical material driving period in which an element is selectively operated to write an image on the electro-optical material. By A first position detecting means for detecting first position information indicating an input position; and an input pen means for driving the second electrode by the second electrode driving means outside the electro-optical substance driving period. A display-integrated type tablet device comprising: second position detecting means for detecting second position information indicating the input position by the input pen means based on a signal. 2. The display-integrated tablet device according to claim 1, wherein the first electrode is a row electrode, the second electrode is a column electrode, and the first electrode driving means is a row electrode driving means. Yes,
The display-integrated type tablet device, wherein the second electrode driving means is a column electrode driving means. 3. A transparent substrate having a plurality of row electrodes arranged in parallel and a plurality of column electrodes orthogonal to the row electrodes, wherein the row electrodes are connected to control terminals while the column electrodes are connected to input terminals. And having a plurality of switching elements arranged on the transparent substrate at the intersections of the electrodes and facing the pixel electrodes connected to the output terminals of all the switching elements with the electro-optical material layer interposed therebetween. An active matrix type display panel having a counter electrode on a substrate, an electronic pen having an electrode for electrostatically coupling with a row electrode and a column electrode of the display panel, a region of a plurality of pixel electrodes in the display panel And a display control circuit for outputting a display control signal and display data for displaying an image on the pixel matrix composed of, and for scanning the column electrodes of the display panel. A detection control circuit that outputs a check control signal, and the display control circuit side is switched and selected in the display period to output a display control signal and display data from the display control circuit, while the detection is performed in the x coordinate detection period. A switching circuit that switches and selects the control circuit side to output a scanning control signal from the detection control circuit, and a row electrode scanning signal for sequentially scanning the row electrodes during the display period is displayed from the display control circuit. A row electrode drive circuit for generating based on a control signal, and a column electrode drive signal for applying image display charges to each picture element electrode connected to the row electrode being scanned during the display period, the switching circuit While it is generated based on the display control signal and the display data from the display circuit, the column electrode scanning signal for sequentially scanning the column electrodes during the x coordinate detection period is generated by the switching circuit. And a column electrode drive circuit that is generated based on the scan control signal, and is induced in the electrodes of the electronic pen due to the row electrode scan signal that is input from the row electrode drive circuit to each row electrode during the display period. The y-coordinate of the tip of the electronic pen is detected based on the applied voltage, and during the x-coordinate detection period, the column electrode scanning circuit inputs the column electrode scanning signal to each column electrode to cause the electronic pen A display-integrated tablet device comprising a coordinate detection circuit for detecting the x-coordinate of the tip of the electronic pen based on the voltage induced in the electrodes. 4. The display-integrated tablet device according to any one of claims 1 to 3, wherein the electro-optical substance is liquid crystal. 5. The first and second electrodes are driven by the first and second electrode driving means to be arranged in a matrix on one of a pair of transparent substrates which face each other and in which an electro-optical material is sandwiched. Each of the switching elements connected to the plurality of pixel electrodes is selectively operated to write an image on the electro-optical material, and during the electro-optical material driving period in which an image is written on the electro-optical material, Based on a signal from the input pen means electrostatically coupled to the first electrode when the first electrode is driven, first position information indicating an input position by the input pen means is detected, Of the second electrode when the second electrode is driven by the second electrode driving means outside the target material driving period.
A method for driving a display-integrated type tablet device, comprising: detecting second position information indicating an input position by the input pen means based on a signal from the input pen means electrostatically coupled to the electrodes. 6. The method for driving a display-integrated tablet device according to claim 5, wherein the first electrode is a row electrode, the second electrode is a column electrode, and the first electrode driving means is a row electrode. Drive means,
The driving method for a display-integrated type tablet device, wherein the second electrode driving means is a column electrode driving means. 7. A row electrode scanning signal generated based on a display control signal is sequentially input to a row electrode of an active matrix display panel to scan the row electrode, while the row electrode scanning signal is scanned based on the display control signal and display data. The generated column electrode drive signal is input to the column electrodes of the display panel to selectively drive the switching elements arranged in a matrix on one of the transparent substrates of the display panel facing each other to display the display panel. An image is written on the electro-optical substance sandwiched between the transparent substrates, and a display period in which an image is written on the electro-optical substance,
The y-coordinate of the tip of the electronic pen is detected based on the voltage induced in the electrode of the electronic pen that is electrostatically coupled to each of the row electrodes due to the row electrode scanning signal input to each of the row electrodes. During the x-coordinate detection period outside the period, the column electrode scanning signal generated based on the scanning control signal is sequentially input to the column electrodes of the display panel to scan the column electrodes and input to each of the column electrodes. A method for driving a display-integrated tablet device, comprising detecting the x-coordinate of the tip of the electronic pen based on the voltage induced in the electrode of the electronic pen due to the column electrode scanning signal. 8. The display-integrated tablet device according to any one of claims 5 to 7, wherein the electro-optical substance is liquid crystal. Driving method.