JP2911083B2 - Display integrated tablet device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display-integrated tablet device used for a personal computer, a word processor and the like.

[0002]

2. Description of the Related Art As a means for inputting handwritten characters and figures into a computer or word processor, for example, a liquid crystal display and an electrostatic induction type tablet are stacked, and the characters and figures are statically written as if we were writing on paper with a writing instrument. 2. Description of the Related Art A tablet device integrated with a display unit capable of inputting to an electric induction type tablet has been put to practical use. However, in this display unit integrated type tablet device, since the reflectance and the transmittance are different between the portion with and without the electrodes, the electrodes can be seen in a grid pattern on the display screen, causing a deterioration in the quality of the liquid crystal display. I have.

In view of the above, a tablet device with an integrated display as shown in FIG. 6 has recently been proposed as a tablet that eliminates such disadvantages (Japanese Patent Application No. 3-46751). This display-integrated tablet device serves both as a display electrode of a liquid crystal display and a coordinate detection electrode of a capacitance-type tablet device. As shown in FIG. 7, a coordinate detection period for detecting designated coordinates on the tablet and a display period for displaying an image are provided during one frame period, and coordinate detection and image display are performed in a time-division manner. I have.

In FIG. 6, a liquid crystal panel 101 has common electrodes Y _{1 to} Y _m (hereinafter, an arbitrary common electrode is referred to as Y) and segment electrodes X _{1 to} X _m arranged orthogonally to each other.
(Hereinafter, an arbitrary segment electrode is described as X) and a liquid crystal is interposed therebetween, and each pixel is formed in a region where each common electrode Y and the segment electrode X intersect. That is, pixels of n × m dots are arranged in a matrix on the liquid crystal panel 101. still,
In the case of a liquid crystal panel used for a single-color display personal computer, n = 480 and m = 640 are usually set.

[0005] This display-integrated tablet device has the advantage that the grid-like electrode pattern is eliminated and is easier to see than the above-described liquid crystal display in which a capacitance type tablet is laminated. Since the electrode and the drive circuit are also used as the capacitive tablet, there is an advantage that the cost can be reduced and the size and weight can be easily reduced.

The display-integrated tablet device operates as follows. That is, the common drive circuit 102 for driving the common electrode Y and the segment drive circuit 103 for driving the segment electrode X are connected to the display control circuit 105 and the detection control circuit 106 via the switching circuit 104. Have been. This switching circuit 104
Is controlled by the control circuit 107, and outputs an output signal from the display control circuit 105 during the display period to the common drive circuit 1.
02 and the segment drive circuit 103,
During the coordinate detection period, the output signal from the detection control circuit 106 is applied to the common drive circuit 102 and the segment drive circuit 103.
Output to In FIG. 6, the switching circuit 1
04, a display control circuit 105, a detection control circuit 106, and a control circuit 107 are represented by being divided into respective blocks. However, in an actual circuit, each of the above circuits is implemented as an LSI (Large Scale Integrated Circuit), and cannot be strictly divided into blocks as described above in terms of form.

In the display period, first, the control circuit 1
The mode signal mode output from 07 to the segment drive circuit 103 and the switching circuit 104 is switched to the display mode. Then, the segment driving circuit 103 selects the display mode, and the switching circuit 104 switches so as to select and output the output signal from the display control circuit 105 side. Then, the display control circuit 1
05, the shift data s is output from the shift data output terminal S, the inverted signal fr is output from the inverted signal output terminal FR, and the clock signal cp is output from the clock output terminal CP1.
1 is outputted, the output clock signal cp2 from a clock output terminal CP2, from the data output terminal D0~D3 output the display data D ₀ to D _3.

The clock signal cp1 is a clock signal having a period of displaying one row of pixels as a cycle. The clock signal cp1 is output via the output terminal CP10 of the switching circuit 104.
As 1o, the clock input terminal YC of the common drive circuit 102
Is input to the latch pulse input terminal XLP of the segment drive circuit 103. Further, shift data s, which is a pulse signal for selecting a specific common electrode Y, is output as shift data so via the output terminal SO of the switching circuit 104 as a shift data input terminal DI of the common drive circuit 102.
O1 is input in synchronization with the clock signal cp1o.

The common drive circuit 102 receives the shift data
When so is input, the pulse position of the shift data so is shifted by the shift register in synchronization with the clock signal cp1o, and the common drive circuit 10 corresponding to the shift position is shifted.
Driving pulses of common electrode drive signal is applied from the second output terminal O1~On common electrodes Y ₁ to Y _n. The common electrode drive signal is generated based on the bias power supply V ₀ ~V ₅ supplied from the DC power supply circuit 112.

The clock signal cp2 is a clock signal having a cycle of a period obtained by dividing a period for displaying pixels of one row into several parts, and is output as a clock signal cp2o via the output terminal CP2O of the switching circuit 104.
3 clock input terminal XCK.

The display data D _{0 to} D ₃ are supplied to the switching circuit 1
Display data D via the 04 output terminal D0O~D3O ₀ o
To D ₃ o as the input terminal XD of the segment drive circuit 103
0 to XD3, and sequentially taken into a register in the segment drive circuit 103 in synchronization with the clock signal cp2o. When all the display data corresponding to the pixels of one row are captured, the captured display data is applied to the clock signal cp input to the latch pulse input terminal XLP.
The driving pulse of the segment electrode driving signal corresponding to each display data is latched at the timing of 1o, and the segment electrode X is output from the output terminals O1 to Om of the segment driving circuit 103.
It is applied to the ₁ to X _m. The segment drive signal is also generated based on the bias power supply V ₀ ~V ₅ supplied from the DC power supply circuit 112.

The inversion signal fr is a signal for periodically inverting the application direction of the voltage applied to the liquid crystal during the display period to prevent the liquid crystal from being deteriorated by electrolysis.
The inverted signal fro is input to the inverted signal input terminal YFR of the common drive circuit 102 and the inverted signal input terminal XFR of the segment drive circuit 103 via the inverted signal output terminal FRO of the switching circuit 104.

[0013] Thus, the pixel matrix of the liquid crystal panel 101 by the operation of the common drive circuit 102 and the segment driving circuit 103 is driven in accordance with the line order, the display data D ₀ to D image liquid crystal panel 10 corresponding to the ₃
1 is displayed.

On the other hand, in the coordinate detection period, first, the mode signal mode output from the control circuit 107 to the segment drive circuit 103 and the switching circuit 104 is switched to the coordinate detection mode. Then, the segment drive circuit 103 selects the coordinate detection mode, and the switching circuit 104 switches so as to select and output the output signal from the detection control circuit 106 side. Then, the shift data sd is output from the shift data output terminal Sd of the detection control circuit 106, and the inverted signal output terminal FRd
Outputs the inverted signal frd from the clock output terminal CP.
1d clock signal cp1d is output from the clock output terminal CP2d outputs the clock signal cp2d, from the data output terminal D0d~D3d drive data D ₀ d~D ₃ d is output.

The clock signal cp1d is a clock signal having a cycle of a scanning period for scanning one common electrode Y or one segment electrode X, and is provided as a common clock signal cp1o via the output terminal CP10 of the switching circuit 4. The clock is input to the clock input terminal YCK of the drive circuit 102 and the latch pulse input terminal XLP of the segment drive circuit 103. Further, shift data sd which is a pulse signal for selecting a specific common electrode Y or a specific segment electrode X is used.
Is input to the shift data input terminal DIO1 of the common drive circuit 102 or the shift data input terminal EIO1 of the segment drive circuit 103 as the shift data so via the output terminal SO of the switching circuit 104 in synchronization with the clock signal cp1d.

Then, in the same manner as in the above-described display period, the pulse position of the shift data so input to the common drive circuit 102 is shifted by the shift register in synchronization with the clock signal cp1o, and corresponds to the shift position. the common electrode scanning signal y ₁ from the output terminal O1~On common electrodes Y ₁ to Y _n to ~y _n (hereinafter, an arbitrary common electrode scanning signal referred to as y) scan pulse is sequentially applied. The common electrode scanning signal y is generated based on the bias power supply V ₀ ~V ₅ supplied from the DC power supply circuit 112.

On the other hand, the shift data so input to the segment driving circuit 103 in which the coordinate detection mode is selected.
The pulse position of the clock signal cp
Is shifted in synchronization with 1o, wherein the output terminal O1~Om corresponding to the shift position segment electrode X ₁ to X _m segment electrode scanning signal x ₁ ~x _n (hereinafter, an arbitrary segment electrode scanning signal and x ) Are sequentially applied.

In the above description, the case where the segment electrode X is scanned based on the shift data so and the clock signal cp1o is described. However, the segment electrode X may be scanned as follows. That is, any one of the bits of the drive data D ₀ d to D ₃ d output from the detection control circuit 106 is used as the shift data sd, and the clock signal cp2d is used as the synchronization signal, and the output terminals O1 to Om of the segment drive circuit 103 are sequentially output. than it outputs the segment electrode scanning signal x to each segment electrode X ₁ to X _m from. At this time, the clock signal cp2d is a clock signal whose cycle is a scanning period for scanning the segment electrode X, and the clock signal cp2o is output via the output terminal CP2O of the switching circuit 104.
As the clock input terminal X of the segment drive circuit 103
Input to CK.

The output terminal EIO2 of the segment drive circuit 103 is an output terminal of the last stage of the shift register. From this output terminal EIO2, a pulse signal sio2 having the same pulse width as the shift data sd as shown in FIG.
Is output. The segment electrode scanning signal x is also generated based on the bias power supply V ₀ ~V ₅ supplied from the DC power supply circuit 112.

The coordinate detection period is divided into an x-coordinate detection period and a y-coordinate detection period following the x-coordinate detection period. During the detection period, a scanning pulse of the common electrode scanning signal y is sequentially applied to the common electrode Y. At that time, the scanning pulse voltage (hereinafter, referred to as a scanning voltage) of the segment electrode scanning signal x or the common electrode scanning signal y for the electrode to be scanned among the segment electrodes X or the common electrode Y is applied to the DC power supply circuit 112. Is set to the bias power supply voltage “V ₅ ” supplied from.
On the other hand, the voltage of the segment electrode scan signal x or the common electrode scan signal y for the non-scanned electrode of the segment electrode X or the common electrode Y (hereinafter, referred to as a non-scan voltage) is a bias supplied from the DC power supply circuit 112. The power supply voltage is set to “V ₁ ”.

[0021] Due to the application of the scanning voltage V _5, FIG. 8
A segment electrode X or a common electrode Y and a designated coordinate detecting pen (hereinafter simply referred to as a detecting pen) 10 as shown in FIG.
The stray capacitance between the detection pen 10 and the detection pen 10
In FIG. 8, a voltage is induced as shown in FIG. The induced voltage generated in the detection pen 108 is amplified by the amplifier 109 and binarized as shown in FIG. 8C, and then input to the x-coordinate detection circuit 110 and the y-coordinate detection circuit 111. The x-coordinate detection circuit 110 and the y-coordinate detection circuit 111
Is the output signal from the amplifier 109 and the control circuit 107
The scanning voltage V ₅ based on the timing signal from
Is detected until the induced voltage reaches the maximum value from the application of the detection pen 108 to the detection pen 108, respectively.
Detects the x coordinate or the y coordinate of the position indicated by.

FIG. 9 shows that during the x-coordinate detection period,
4 shows a timing chart of a segment electrode scanning signal x applied to a segment electrode X of the liquid crystal panel 101.

FIG. 10 is a block diagram of the liquid crystal panel 120, the common drive circuit 121, and the segment drive circuit 122 when the display-integrated tablet device having the above-described configuration is applied to color display. In this case, the display-integrated tablet device includes a liquid crystal panel 12.
It has basically the same configuration as the display-integrated tablet device shown in FIG. 6 except that a filter having a predetermined transmitted light characteristic is formed in each pixel at 0.

As shown in FIG. 10, when the common electrode Y is located above the segment electrode X as viewed from the operator, the display data for R (red) (for example, the display data D ₀ o) The segment electrode (for example, X ₁ , X ₄ ,
X ₇ ,...), An R color filter is formed on the intersection area of the common electrode Y facing the common electrode Y. Also, segment electrodes (for example, X ₂ , X ₅ , X ₈ ,...) To which a drive pulse of a segment electrode drive signal is applied based on display data for G (green) (for example, display data D ₁ o). A G color filter is formed on the intersection area between the common electrodes Y facing each other.
Similarly, display data for B (blue) (for example, display data D ₂
o), a B color filter is formed on the intersection region of the common electrode Y facing the segment electrode (for example, X ₃ , X ₆ , X ₉ ,...) to which the drive pulse of the segment electrode drive signal is applied. You.

The surface on which the color filter is formed is not limited to the case described above, and is located above the segment electrode X when the segment electrode X is located on the upper side. Or,
It may be on a glass substrate on which the lower electrode is formed. When the display on the liquid crystal panel 120 is viewed by reflected light of light incident from the outside, C (cyan), M (magenta) and Y (yellow), which are complementary colors of the R, B, and G colors, are used. Are formed. In the case of a simple liquid crystal panel that does not require full color, two types of color filters are formed.

The liquid crystal panel 120 for color display includes:
The electrode width of the segment electrode X is smaller than that of the liquid crystal panel 101 for monochromatic display shown in FIG. 6, and the pitch is also smaller. In addition, the number of the segment electrodes X also increases, and the number of output terminals O1 to Om of the segment drive circuit 122 also increases accordingly.

For example, in the case of the display-integrated tablet device of the single color display shown in FIG. 6, the number of segment electrodes X is m = 640 and the number of common electrodes Y is n = 4 as described above.
80. The pitch of the segment electrodes X and the pitch of the common electrodes Y are substantially the same. However,
In the case of the liquid crystal panel 120 for color display as shown in FIG. 10, the minimum unit (hereinafter, referred to as a picture element) of a displayed image is a set of three RGB pixels arranged along the common electrode Y. Therefore, in order to display the same 480 × 640 picture element as the display-integrated tablet device shown in FIG. 6, 640 × 3 = 1920 segment electrodes X are required. In addition, in the case of the display-integrated tablet device for color display, the vertical and horizontal dimensions of the liquid crystal panel 120 are the same as the dimensions of the liquid crystal panel 101 for single-color display so as to have compatibility with the tablet device for integrated display of single color display. It is formed substantially the same. As a result, as shown in FIG. 10, the width of the segment electrode X in the color display liquid crystal panel 120 is smaller than the width of the common electrode Y.

[0028]

As described above, FIG.
In the liquid crystal panel 120 for color display as shown in (1), the electrode density of the segment electrode X is approximately three times the electrode density of the common electrode Y. Therefore, when configuring a display-integrated tablet device using such a liquid crystal panel 120, the following problems occur.

First Problem In the case of a display-integrated tablet device for monochromatic display as shown in FIG. 6, it is sufficient to scan 640 electrodes during the x-coordinate detection period. Therefore, when the frequency of the clock signal cp1d is 3 MHz, the scanning period of one segment electrode X is 0.333 μsec, and the x coordinate detection period is 0.333 × 640 = 213.12 μsec. On the other hand, in the case of a color display integrated tablet device having the liquid crystal panel 120 as shown in FIG. 10, the x coordinate detection period is 0.333 × 1920 = 639.36 μsec.
Thus, the x-coordinate detection period is approximately 430 μsec longer than the display-integrated tablet device for monochrome display.

As a result, when the number of frames per second of the display-integrated tablet device for color display is set to be the same as the number of frames per second for the display-integrated tablet device for monochrome display, the x-coordinate detection period becomes longer than in FIG. As the coordinate detection period becomes longer, the display period becomes shorter accordingly. Then,
There arises a problem that the display duty ratio is lowered and the display quality is deteriorated.

Since the pitch of the segment electrode X is smaller than the pitch of the common electrode Y, when the segment electrode X and the common electrode Y are scanned in synchronization with the same clock signal cp1d, the scanning speed in the x direction (the segment electrode The scanning speed of the scanning signal x) is lower than the scanning speed in the y direction (the shifting speed of the common electrode scanning signal y). Then,
The time required for the pulse applied to the segment electrode X for inducing a voltage on the detection electrode of the detection pen 108 to approach the detection electrode increases, and the time required to pass immediately below the detection electrode also increases.

FIG. 11 shows a waveform (a relative waveform with a peak value of "1") of the voltage induced on the detection electrode of the detection pen 108 when scanning the segment electrode X and the common electrode Y having different pitches. . As described above, the voltage waveform induced when scanning the segment electrode X having a small pitch has a wider base and is gentler as a whole than the voltage waveform induced when scanning the common electrode Y having a large pitch. Presents a simple curve. As described above, the gentleness of the voltage waveform induced on the detection electrode of the detection pen 108 means that the voltage waveform is binarized when the induced voltage is binarized by a comparator or the like as shown in FIG. The rise time “T ₁ ” of the pulse tends to vary under the influence of noise in the tail. Therefore, the value of the time “T” up to the peak of the voltage waveform calculated based on the rising time “T ₁ ” also tends to fluctuate, and the detection accuracy of the x coordinate of the tip of the detection pen 108 decreases.

Second Problem The display integrated tablet device of the single color display and the tablet device of the color integrated display described above have the segment electrode X or the common electrode Y and the detection pen 108 as shown in FIG. Of the tip of the detection pen 108 is detected using the capacitance between the detection pen 108 and the detection electrode. At that time, the voltage induced on the detection electrode is proportional to the capacitance.

Therefore, when the electrode width is narrow like the segment electrode X in the display integrated tablet device for color display, the voltage induced on the detection electrode of the detection pen 108 also becomes low. As a result, the accuracy of detecting the x coordinate of the tip of the detection pen 108 is reduced.

Accordingly, an object of the present invention is to provide a display-integrated tablet device capable of obtaining high coordinate detection accuracy without deteriorating display quality even when the density of one electrode of the display panel is higher than the density of the other electrode. Is to provide.

[0036]

According to a first aspect of the present invention, a first electrode group arranged at a predetermined density is provided.
Are arranged at different densities in different directions from the first electrode group.
A display panel composed of the second electrode group
And a first electrode group and a second electrode group
Indicating means having a detection electrode at the tip thereof, and the first electrode group
Driving means for driving the first electrode group, and driving the second electrode group
A second driving unit, and the first driving unit and the second driving unit during a display period.
2 Display an image on the display panel by controlling the driving means
Display control means, and the first drive means during the coordinate detection period.
Control to sequentially apply a scanning voltage to the first electrode group of the display panel.
While applying and scanning, while controlling the second driving means,
Detection control for scanning by sequentially applying a scanning voltage to the second electrode group
Means and timing of generation of an output signal from the indicating means
And scanning timing of the first electrode group or the second electrode group
From the display panel indicated by the instruction means
Display-integrated tablet having coordinate detecting means for detecting coordinates
A detection device, wherein the detection control means comprises:
To the electrode group with the higher array density of the group and the second electrode group
The number of scans per unit time is lower when the array density is lower.
More than the number of scans per unit time per pole group
As described above, the first driving means and the second driving means are controlled.
It is characterized by having a configuration.

Further, the second invention is arranged at a predetermined density.
The first electrode group differs from the first electrode group in a different direction from the first electrode group.
Display panel comprising second electrode group arranged at high density
And a first electrode group and a second electrode group of the display panel
Indicating means having an electrically coupled detection electrode at the tip,
First driving means for driving the first electrode group; and second driving means for driving the second electrode group.
A second driving means for driving the pole group;
Controlling the moving means and the second driving means on the display panel.
Display control means for displaying an image on the
By controlling the first driving means, the first driving means is connected to the first electrode group of the display panel.
The second driving means while scanning by applying a scanning voltage sequentially;
And sequentially applying a scanning voltage to the second electrode group to perform scanning.
Detection control means for inspecting the output signal from the instruction means.
Generation timing and the first electrode group or the second electrode group
Instructed by the instruction means from the scanning timing
Table having coordinate detecting means for detecting coordinates on a display panel
An integrated tablet device, wherein said detection control means
Means that a plurality of first electrodes or a plurality of second electrodes
And the first electrode group and the second
Simultaneous scanning of the electrode group with the higher array density among the electrode groups
The number of electrodes to be inspected is
So that the number of electrodes to be scanned sometimes exceeds
It has a configuration for controlling the first driving means and the second driving means.
It is characterized by the following. Further, the third invention provides a method for controlling a predetermined density.
1st electrode group arranged in a direction different from this 1st electrode group
Composed of second electrode groups arranged at different densities
Display panel, a first electrode group and a second electrode of the display panel.
Indication with a sensing electrode at the tip that is electrostatically coupled to the pole group
Means, first driving means for driving the first electrode group, and
A second driving unit for driving the second electrode group;
The display is controlled by controlling the first driving means and the second driving means.
A display control means for displaying an image on the panel, and a coordinate detection period.
Controlling the first driving means during the first operation of the display panel.
While scanning is performed by sequentially applying a scanning voltage to the electrode group, the second
The driving means is controlled to sequentially apply a scanning voltage to the second electrode group.
Detection control means for performing additional scanning and output from the instruction means.
Force signal generation timing and the first electrode group or the second
From the scanning timing of the electrode group, the finger is
A coordinate detecting means for detecting coordinates on the indicated display panel;
A Viewing-integrated type tablet device having the above detection system
The control means is an array of the first electrode group and the second electrode group.
The scanning frequency of the higher density electrode group is lower
So that the scanning frequency of the first electrode group becomes higher than that of the first electrode group.
It has a configuration for controlling the driving means and the second driving means.
And features.

[0038]

[Action] In the first invention, in the coordinate detection period, the detection
The first driving means and the second driving means are exchanged by the control means.
Controlled by each other, the first electrode group and the second electrode group run sequentially.
Will be examined. At this time, the first electrode group and the second electrode group
Per unit time for the electrode group with the higher array density
Unit time for the electrode group with the lower array density
Scanned to be more than the number of scans per
Output signal induced by the indicating means from the denser electrode group
Issue can be raised.

[0039]

In the second invention, during the coordinate detection period, the first drive unit and the second drive unit are controlled by the detection control unit.
The moving means are alternately controlled so that the first electrode or the second electrode
Are simultaneously scanned. At this time, the first electrode group
And the electrode group having the higher array density of the second electrode group is arranged.
More electrodes at the same time than the electrode group with the lower row density
It is scanned and guided to the indicating means from the electrode group with the higher array density.
The output signal generated can be increased. In addition, the third
In the invention of the above, during the coordinate detection period, the detection control means
As a result, the first driving means and the second driving means are alternately controlled.
Thus, the first electrode group and the second electrode group are sequentially scanned. So
At this time, the arrangement density of the first electrode group and the second electrode group
The scanning frequency of the higher electrode group is scanned higher and the
Output signal induced by the indicating means from the denser electrode group
Issue can be raised.

[0041]

[0042]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. Note that the configurations of the liquid crystal panel, common drive circuit, and segment drive circuit of the display-integrated tablet device of the present invention are the same as those of the liquid crystal panel 120, common drive circuit 121, and segment drive circuit 122 shown in FIG. . The basic configuration of the switching circuit, the display control circuit, the detection control circuit, the control circuit, the detection pen, the amplifier, the x-coordinate detection circuit, the y-coordinate detection circuit, the y-coordinate detection circuit, the DC power supply circuit, and the like in the display-integrated tablet device of the present invention is as follows. , FIG.
It is assumed to be the same as the display integrated type tablet device shown in FIG. Hereinafter, description will be made using the same numbers as those in FIG. 6 or FIG.

FIG. 1 is a timing chart of the segment electrode scanning signal x and the common electrode scanning signal y when scanning the liquid crystal panel 120 of the display-integrated tablet device in this embodiment. As shown in FIG. 1, in the display-integrated tablet device according to the present embodiment, the clock signal cp1o output from the switching circuit 104 during the coordinate detection period is different in frequency between the x coordinate detection period and the y coordinate detection period. Use a clock signal. And the common electrode Y
A segment electrode scanning clock signal cp for scanning a segment electrode X exhibiting an electrode density approximately three times the electrode density of cp
The frequency of 1o _x, is to three times the frequency of the clock signal cp1o _y scan the common electrodes.

[0044] Thus, by making the frequency of the segment electrode scanning clock signal Cplo _x three times the frequency of the common electrode scanning clock signal cp1o _y, the x
The scanning speed in the direction becomes substantially equal to the scanning speed in the y direction. As a result, the voltage waveform induced on the detection electrode of the detection pen 108 when scanning the segment electrode X having a small pitch is substantially equal to the voltage waveform induced when scanning the common electrode Y having a large pitch. The x coordinate detection accuracy of the tip of the pen 108 and the y coordinate detection accuracy become substantially equal.
In the case of collectively the segment electrode scanning clock signal cp1o _x and the common electrode scanning clock signal cp1o _y say clock signal cp1o.

The generation of the clock signal cp1o as described above
What is necessary is just to carry out as follows. That is, when generating a clock signal cp1d by the detection control circuit 106, the x-coordinate detection period to generate a clock signal cp1d frequency and the frequency of the segment electrode scanning clock signal cp1o _x. On the other hand, during the y coordinate detection period, the common electrode scanning clock signal is used.
to generate a clock signal cp1d of frequency and the same frequency of cp1o _y. Then, the clock signal cp1o from the output terminal CP10 of the switching circuit 104 is connected to the clock input terminal YCK (y-coordinate detection period) of the common drive circuit 121 and the segment drive by a switch circuit (not shown) controlled by the control circuit 107. Latch pulse input terminal XL of circuit 122
The input is switched to P (x-coordinate detection period). By doing so, the segment electrode scanning clock signal cp1o _x is input to the segment driving circuit 122 during the x coordinate detection period, while the common electrode scanning clock signal cp1o _y is input to the common driving circuit 121 during the y coordinate detection period. It is input to.

In the display integrated tablet device for color display, the clock input terminal YCK of the common drive circuit 121 and the latch pulse input terminal XLP of the segment drive circuit 122 are both connected to the same output terminal CP1O of the switching circuit 104. (See FIG. 6). Therefore, if possible the output of the different segment electrode scanning clock signal frequency cp1o _x and the common electrode scanning clock signal cp1o _y as shown in Figure 1 the Shimuru, the clock signal cp1d generated by the detection control circuit 106 It is necessary to change the frequency between the x coordinate detection period and the y coordinate detection period.

Therefore, in the display integrated tablet device for color display in another embodiment, the detection control circuit 10
6 of the two clock output terminal CP1d clock output terminal CP1d _x, constituted by CP1d _y, the output terminal CP1O two output terminals CP1O _x of the switching circuit 104, CP1O
constituted by _y, a latch pulse input terminal XL of the output terminal CP1O _x the segment driving circuit 122 of the switching circuit 104
P and the output terminal CP1O of the switching circuit 104.
_y and the clock input terminal YCK of the common drive circuit 121 are connected.

Further, the detection control circuit 106
The two clock signals cp1d _x and cp1d _y having different frequencies are generated, and the clock signal cp1d _x having the higher frequency is output from the clock output terminal CO1d _x, while the clock signal cp1d is generated.
_y is output from the clock output terminal CO1d _y .
By doing so, the detection control circuit 106 does not need to switch the frequency between the x-coordinate detection period and the y-coordinate detection period when generating the clock signal cp1d, and simplifies the configuration of the clock signal generation means (not shown). Can be

[0049] Incidentally, when, as shown in FIG. 1, x-coordinate detection period while the y-coordinate detection period the segment electrode scanning clock signal in stopping the output of the clock signal cp1o _y scan the common electrodes during if so as to stop the output of cp1o _x, it is possible to as small as possible the output of the clock signal cp1o at high coordinate detection period the power consumption for the high frequencies.

FIG. 2 shows an electrode (hatching) in an active state to which the segment electrode scanning signal x or the common electrode scanning signal y is applied during the coordinate detection period. In the drawing, "Sp" is the scanning speed in the x direction or the y direction. Here, in the liquid crystal panel 120 having different electrode densities of the segment electrode X and the common electrode Y as shown in FIG. 10, the number of electrodes to which the scanning pulse in the segment electrode scanning signal x or the common electrode scanning signal y is simultaneously applied is smaller. In the case where the segment electrode X and the common electrode Y are the same, as shown in FIGS. 2A and 2B, the width of the electrode in the active state is higher on the segment electrode X side where the electrode density is higher. narrow. Therefore, the capacitance between the segment electrode X and the detection electrode of the detection pen 108 decreases, and the voltage induced on the detection electrode decreases.

The number of electrodes to which the scanning pulse is simultaneously applied during the coordinate detection period is determined by shift data so (see FIG. 1).
Is determined by the pulse width. In the present embodiment, as shown in FIG. 1, the pulse width of the shift data so in the y coordinate detection period is set to four periods of the common electrode scanning clock signal cp1o _y , whereas in the x coordinate detection period, the pulse width of the shift data so is set to 12 cycles of the segment electrode scanning clock signal cp1o _x. Therefore, the number of common electrodes Y to which the above-mentioned scanning pulse is applied simultaneously is four, whereas the number of common electrodes Y is 12 in the case of the segment electrode X.

[0052] From the above, the frequency of the segment electrode X of the electrode density common electrode Y of the electrode density of 3 times a a clock signal for the segment electrode scanning cp1o _x frequencies common electrode scan clock signal cp1o _y In the case of three times, not only the scanning speed Sp in the x direction and the scanning speed in the y direction become the same as shown in FIGS. 2A and 2C, but also the active state in both electrodes X and Y. Have the same electrode width. As a result, the scanning voltage "V _5" to be applied to the waveform and the common electrode Y of the voltage induced in the detection electrode of the detection pen 108 due to the scanning voltage "V _5" applied to the segment electrode X The waveform of the induced voltage substantially coincides with the waveform of the induced voltage.

As described above, 2 induced by the detection electrode
If the three voltage waveforms are the same, it is convenient for the induced voltage to be amplified by the amplifier 109 as follows. That is, when two voltage waveforms input to the amplifier 109 are different, the frequency characteristic and phase characteristic of the amplifier 109 must be set so as to simultaneously amplify the two voltage signals having different waveforms. However, when the two voltage waveforms are the same, the frequency characteristics and the phase characteristics can be set very easily and optimally.

FIG. 3 is a timing chart of a segment electrode scanning signal x and a common electrode scanning signal y in a color display integrated tablet device in still another embodiment. As shown in FIG. 3, in the display-integrated tablet device according to the present embodiment, the clock signal cp1o output from the switching circuit 104 during the coordinate detection period.
Is a single frequency clock signal. When scanning the segment electrode X having the higher electrode density, the same segment electrode scanning signals x _{1 to} x ₃ ,... Are applied to three adjacent segment electrodes X _{1 to} X ₃ ,. The application is performed at the timing (that is, three segment electrodes X are simultaneously scanned in one clock).

As described above, the scanning speed Sp in the x direction is increased without increasing the frequency of the clock signal cp1o when scanning the segment electrode X. Since the three segment electrodes X are simultaneously scanned during the x-coordinate detection period, there is a concern that the x-coordinate detection accuracy may decrease. However, the electrode density of the segment electrodes X is approximately three times the electrode density of the common electrode Y. For this reason, there is substantially no problem since the scanning speeds of both coordinates are substantially the same.

Also in the case of this embodiment, the scanning speed Sp in the x direction and the scanning speed in the y direction are the same, and the widths of the electrodes X and Y in the active state are also the same. Therefore, due to the scanning voltage "V _5" to be applied to the waveform and the common electrode Y of the induced voltage in the detection electrode of the detection pen 108 due to the scanning voltage "V _5" applied to the segment electrode X The waveform of the induced voltage substantially matches.

FIG. 4 is a block diagram of a liquid crystal panel used in a display integrated tablet device for color display according to still another embodiment and a driving circuit thereof. The liquid crystal panel of this embodiment is the same as the liquid crystal panel 120 shown in FIG. 10, and the electrode density of the segment electrode X is approximately three times the electrode density of the common electrode Y. The segment electrode X is driven by two segment drive circuits, an upper segment drive circuit 1 and a lower segment drive circuit 2. However, the common electrode Y is driven by one common drive circuit 121 as in the above embodiments.

The upper segment drive circuit 1 and the lower segment drive circuit 2 have the same structure, and have basically the same structure as the segment drive circuit 122 described above. During the x-coordinate detection period, the input terminals EIO1, MODE, XCK,
The same signal is input to XFR. On the other hand, the output terminals O1 to O (m-1) of the upper segment drive circuit 1
Are connected to the odd-numbered segment electrodes X ₁ , X ₃ , X ₅ ,..., X _m−1 , and output terminals O 2 to O 2 of the lower segment driving circuit 2.
m is connected to the even-numbered segment electrodes X ₂ , X ₄ , X ₆ ,..., X _m .

As described above, by scanning the segment electrode X with the two segment driving circuits 1 and 2,
Even if the segment electrode density is approximately three times that of the monochrome display because of the color display, the number of input terminals provided on one side of the liquid crystal panel 120 can be reduced to １. 2 becomes easy. Also,
If the scanning speed Sp in the x direction and the y direction is not required to be very high during the coordinate detection period, the segment electrode scanning clock signal cp1o _x having a frequency 1.5 times the frequency of the common electrode scanning clock signal cp1o _y is used. Double segment drive circuit 1,
2 by shifting the phase by half a clock to the latch pulse input terminal XLP, thereby making the scanning speed Sp in the x direction and the y direction the same, and making the widths of the electrodes X and Y in the active state the same. Can be.

However, when the scanning speed Sp in the x and y directions is high and the frequency of the clock signal cp1o is on the order of MHz, the distributed resistance R
There is a problem since a delay transmission path is formed by the segment electrode X and the common electrode Y due to the distributed capacitance C generated between the common electrode Y and the common electrode Y.

That is, for example, after the scanning voltage “V ₅ ” is applied from the output terminal O 1 of the upper segment drive circuit 1 to the segment electrode X ₁ , the intersection area between the segment electrode X ₁ and each of the common electrodes Y _{1 to} Y _n. The time until the voltage “V ₅ ” is applied is sequentially delayed by the product (distribution CR) of the distributed capacitance C and the distributed resistance R. The time until the voltage “V ₅ ” is applied to the intersection region with the common electrode Y _n farthest from the upper segment drive circuit 1 is delayed by the order of μsec. As a result, the detection pen 1
Even when the x coordinate of the tip of 08 is the same, the time when the induced voltage is generated at the detection electrode of the detection pen 108 at the time of detecting the x coordinate differs depending on the y coordinate.

This also occurs when the scanning voltage “V ₅ ” is applied to the segment electrode X from the lower segment drive circuit 2. However, the direction of the delay in that case is the opposite direction to that described above.

Here, for example, the upper segment driving circuit 1
A scanning voltage “V ₅ ” is applied to the segment electrode X ₁ from the output terminal O 1 of the segment electrode X ₁ , and the segment electrode scanning clock signal cp
By applying a scanning voltage "V _5" from the output terminal O2 of the lower segment drive circuit 2 to the segment electrodes X ₂ at a half clock time 1o _x, detection pen 108 tip segment electrode X ₁ and the segment electrode consider the case of a position on the boundary between the X _2. At this time, as described above, the detection pen 1
If the 08 tip is positioned to the common electrodes Y ₁ vicinity,
The upper segment drive circuit 1 causes the segment electrode X ₁
Is different from the delay time until the voltage is induced on the detection electrode of the detection pen 108 when scanning is performed, and the delay time when the segment electrode X ₂ is scanned by the lower segment driving circuit 2. Although the two segment electrodes X ₁ and X ₂ are scanned almost simultaneously, two induced voltage waveforms are detected at a certain time interval.

[0064] This means that the tip of the detection pen 108 is the same can be positioned near the common electrode Y _n, 2 two induced voltage waveform at a certain time is detected. In other words, when the tip of the detection pen 108 is located at the middle point in the y direction, the two induced voltage waveforms are overlapped to obtain one induced voltage waveform. 2 after a time corresponding to the deviation
Two induced voltage waveforms are obtained.

Therefore, when the scanning speed Sp in the x and y directions is high (that is, the frequency of the clock signal cp1o is high) and high coordinate detection accuracy is required,
Either the x-coordinate detection is performed by only one of the two segment driving circuits 1 and 2 or the two segment driving circuits 1 and 2
2, x-coordinate detection must be performed alternately in different periods.

The above upper segment drive circuit 1 shown in FIG.
Output terminals O1 to O (m-1) or the output terminals O2 to Om of the lower segment driving circuit 2 have segment electrodes X
It is connected alternately to every other one of the ₁ to X _m. However, the present embodiment is not limited to this. When the liquid crystal panel 120 is a liquid crystal panel for full color display, the following segment electrodes X that display three colors of RGB adjacent to each other are defined as one block. As described above, they may be alternately connected to the segment drive circuits 1 and 2. Segment electrode upper segment drive circuit _{1 X 1, X 2, X} 3 → the output terminal _{O1 X 7, X 8, X} 9 → the output terminal _{O3 X 13, X 14, X} 15 → output terminal O5 ... ... segment electrode lower segment driving circuit _{2 X 4, X 5, X} 6 → output terminal _{O2 X 10, X 11, X} 12 → output terminal _{O4 X 16, X 17, X} 18 → output terminal O6 ... ... Furthermore, simplified that do not require full In the case of a liquid crystal panel, the segment electrodes X for displaying two colors adjacent to each other may be alternately connected to the segment drive circuits 1 and 2 as one block.

FIG. 5 is a block diagram of a liquid crystal panel used in a display-integrated tablet device for color display according to still another embodiment and a driving circuit thereof. In the liquid crystal panel 3 of this embodiment, the electrode density of the segment electrodes X is approximately three times the electrode density of the common electrode Y, similarly to the liquid crystal panel 120 shown in FIG. Then, the segment electrode X
Is divided into an upper segment electrode XU and a lower segment electrode XL, and the liquid crystal panel 3 is also divided into the upper segment electrode XU.
And upper liquid crystal panel 3 comprising common electrodes Y _{1 to} Y _{n / 2}
U, lower segment electrode XL and common electrode Y _{n / 2 + 1}
It is divided into a lower liquid crystal panel 3L consisting to Y _n. That is, the liquid crystal panel 3 in the present embodiment is a two-screen liquid crystal panel.

During the coordinate detection period, when scanning the segment electrodes X of the liquid crystal panel 3 having the above configuration, the upper segment electrode XU is scanned by the upper segment drive circuit 4, while the lower segment electrode XL is driven by the lower segment drive. The circuit 5 scans at the same timing as the upper segment electrode XU. All the common electrodes Y _{1 to} Y _n are sequentially scanned by one common drive circuit 121 as in the above-described embodiments.

At this time, the upper segment driving circuit 4
And the latch pulse input terminal XLP of the lower segment drive circuit 5 inputs the segment electrode scanning clock signal cp1o _x as shown in FIG. 1 or FIG. 3, shown in FIG. 1 or FIG. 3 to the shift data input terminal EIO1 Input such shift data so. On the other hand, the common drive circuit 121
Of the clock input terminal YCK enter the common electrode scanning clock signal cp1o _y as shown in FIG. 1 or FIG. 3, B
R> FIG. 1 or FIG.
Is input as shown in FIG.

By doing so, the segment electrode scanning signals x _{1 to} x _m as shown in FIG. 1 or FIG. 3 are applied to the segment electrodes X _{1 to} X _m while the common electrodes Y _{1 to} Y _n are applied. has common electrode scan signal y ₁ ~y _n as shown in FIG. 1 or FIG. 3 are applied. As a result, the scanning speed Sp in the x direction and the width of the segment electrode in the active state can be tripled. Therefore, the scanning speed Sp in the x direction and the width of the segment electrode in the active state are made closer to the value of the scanning speed Sp in the y direction and the value of the common electrode width in the active state, so that the x coordinate detection accuracy and y
The coordinate detection accuracy can be made substantially the same accuracy.

Since the segment electrode X is divided into an upper segment electrode XU and a lower segment electrode XL, the number of the distributed resistors R in each of the segment electrodes XU and XL can be reduced, and the x coordinate detection period can be reduced. , The delay time of the voltage induced on the detection electrode of the detection pen 108 can be shortened. Therefore, the x coordinate detection accuracy can be further improved.

At this time, the segment electrode X and the common electrode Y are electrostatically coupled. Therefore, when the electrode width of the segment electrode X is narrow as in the liquid crystal panel 3, the resistance of the segment electrode X increases, so that the voltage induced by the scanning voltage “V ₅ ” applied to the common electrode Y Will be higher. Therefore, in the case of a two-divided duty color liquid crystal panel such as the liquid crystal panel 3 in the present embodiment, the segment electrodes X due to the scanning voltage “V ₅ ” applied to the common electrode Y during the y coordinate detection period. At the boundary between the upper segment electrode XU and the lower segment electrode XL. Accordingly, the segment electrode X is positioned above the common electrode Y, and the tip of the detection pen 108 is moved to the upper liquid crystal panel 3U and the lower liquid crystal panel 3U.
L, the change in the voltage induced on the segment electrode X during the y-coordinate detection period is detected by the detection pen 10.
8, the y-coordinate detection accuracy near the boundary between the upper liquid crystal panel 3U and the lower liquid crystal panel 3L is significantly reduced.

Therefore, in the liquid crystal panel 3 of this embodiment, as shown in FIG.
, The influence of the voltage induced on the segment electrode X during the y-coordinate detection period is reduced.

[0074] The segment electrode scanning clock signal in the present invention cp1o _x, clock signal cp scan the common electrodes
The frequency and pulse width of 1o _y and shift data so are shown in FIG.
Further, the present invention is not limited to the frequency and pulse width shown in FIG. 3, but may be appropriately set so as to obtain the optimal segment scanning signal x and the common electrode scanning signal y. In each of the above embodiments, the arrangement density of the segment electrode group is higher than that of the common electrode group. However, the present invention is not limited to this.

[0075]

As apparent from the above description, the display-integrated tablet device according to the first aspect of the present invention comprises a display panel .
The electrode having the higher array density of the first electrode group and the second electrode group
The number of scans per unit time per pole group is low in array density
More than the number of scans per unit time for the other electrode group
Control the first driving means and the second driving means so that
Since the detection control means has a configuration
When the density of one of the electrodes is greater than the density of the other
Even so, high coordinate detection accuracy can be obtained. As a result, for example, the scanning speed in the x direction and the scanning speed in the y direction
Approximately the same degree, induced in the indicating means during the x-coordinate detection period
Output signal and induced by the indicating means during the y-coordinate detection period.
And the output signal to be output can be made substantially the same.
Coordinate detection accuracy can be substantially the same.

[0076]

Further, the first electrode group and the second electrode group
Since when scanning electrode group of the higher arrangement density of the increasing the number of scanning lines per unit time, is possible to prevent an increase in the scanning time by the number of electrodes increases (i.e., increasing the coordinate detection period) I can . Therefore, it is possible to prevent the display quality from deteriorating due to the decrease in the display duty ratio due to the shortening of the display period.

Further, the display-integrated tablet device according to the second aspect of the present invention includes a first electrode group and a second electrode forming a display panel.
Simultaneous scanning of the electrode group with the higher array density among the electrode groups
The number of electrodes to be applied simultaneously to the electrode group with the lower array density
1st drive so that the number of electrodes to be scanned
Control means for controlling the means and the second drive means
The density of one electrode of the display panel is
Higher coordinate detection even when the electrode density is larger than the other electrode density
Accuracy is obtained. As a result, for example, the first electrode group and
The electrode width in the active state in the second electrode group is substantially the same.
The output induced by the indicating means during the x-coordinate detection period
Signal and output induced by the indicating means during the y-coordinate detection period
The signals can be made substantially the same, and the x-coordinate detection accuracy and the y-coordinate detection accuracy can be made substantially the same. Further, the first electrode group and the first electrode group
And scans the electrode group with the higher array density of the second electrode group.
When scanning, the number of scans that are scanned simultaneously is increased,
An increase in scanning time due to an increase in the number of poles (that is,
Detection period) can be prevented. Accordingly
The display duty ratio caused by the shortened display period
It is possible to prevent the display quality from deteriorating due to the reduction. Also, the third
The display-integrated tablet device of the invention comprises a display panel
Of the first electrode group and the second electrode group
The scanning frequency of the electrode group with the lower array density
The first driving means and the
The detection control means has a configuration for controlling the second drive means.
Therefore, the density of one electrode of the display panel is
High coordinate detection accuracy, even if the
Can be As a result, for example, the scanning speed in the x direction
X-coordinate detection by setting the degree and scanning speed in the y-direction approximately the same
Signal induced by the indicating means during the period and the y-coordinate detection period
And the output signal induced by the indicating means is substantially the same.
The x-coordinate detection accuracy and the y-coordinate detection accuracy are approximately the same.
Wear. Further, among the first electrode group and the second electrode group,
When scanning the electrode group with the higher array density, the scanning frequency
The scanning time by increasing the number of electrodes
(That is, increase in the coordinate detection period).
Can be. Therefore, it is caused by the shortening of the display period.
Prevents deterioration of display quality due to lower display duty ratio
Wear.

[0079]

[Brief description of the drawings]

FIG. 1 is a timing chart of a segment electrode scanning signal and a common electrode scanning signal applied to a segment electrode and a common electrode in a liquid crystal panel used in a display-integrated tablet device of the present invention.

FIG. 2 is an explanatory diagram of an electrode that is in an active state when a scanning voltage is applied during a coordinate detection period.

FIG. 3 is a timing chart different from FIG.

FIG. 4 is a diagram showing an example of a liquid crystal panel used in the display-integrated tablet device of the present invention.

FIG. 5 is a view showing a liquid crystal panel different from FIG. 4;

FIG. 6 is a block diagram of a conventional display-integrated tablet device.

7 is an explanatory diagram of a display period and a coordinate detection period in the display-integrated tablet device shown in FIG.

8 is an explanatory diagram of a stray capacitance between a segment electrode X or a common electrode Y and a detection pen, a detection signal from the detection pen, and a binarized signal thereof in the display-integrated tablet device shown in FIG.

9 is a timing chart of a segment electrode scanning signal applied to a segment electrode during an x coordinate detection period in the display-integrated tablet device shown in FIG.

10 is a block diagram of a liquid crystal panel and its driving circuit when the display-integrated tablet device shown in FIG. 6 is applied to color display.

11 is a diagram showing a voltage waveform induced on a detection electrode of a detection pen when scanning the liquid crystal panel for color display shown in FIG.

[Explanation of symbols]

1,4 ... upper segment drive circuit, 2,5 ... lower segment drive circuit, 3,120 ... liquid crystal panel,
3U: upper liquid crystal panel, 3L: lower liquid crystal panel,
104: switching circuit, 106: detection control circuit,
108: detection pen, 121: common drive circuit,
122 ... Segment drive circuit.

Claims (3)

(57) [Claims] A first electrode group arranged at a predetermined density.
Of the first group of electrodes arranged at different densities in different directions from the first group of electrodes.
A display panel comprising two electrode groups, and the display panel
Of the first electrode group and the second electrode group
Indicator means having an output electrode at the tip, and driving the first electrode group
A first driving unit that moves, and a second driving unit that drives the second electrode group.
A driving unit, and the first driving unit and the second driving unit during a display period.
Table for controlling the moving means to display an image on the display panel
Control means and the first drive means during the coordinate detection period.
And sequentially applies a scanning voltage to the first electrode group of the display panel.
While controlling the second driving means to control the second driving means.
Detection control means for scanning by applying a scanning voltage to the electrode group sequentially
And the timing of generation of the output signal from the instruction means.
The scanning timing of the first electrode group or the second electrode group
Coordinates on the display panel indicated by the above-mentioned indicating means
Display-integrated tablet having coordinate detecting means for detecting an image
An apparatus, the detection control unit, the first electrode group and the second electrode group
Per unit time for the electrode group with the higher array density
Unit time for the electrode group with the lower array density
The first drive so that the number of
And means for controlling the second driving means.
Characteristic display integrated tablet device. 2. A first electrode group arranged at a predetermined density.
Of the first group of electrodes arranged at different densities in different directions from the first group of electrodes.
A display panel comprising two electrode groups, and the display panel
Of the first electrode group and the second electrode group
Indicator means having an output electrode at the tip, and driving the first electrode group
A first driving unit that moves, and a second driving unit that drives the second electrode group.
A driving unit, and the first driving unit and the second driving unit during a display period.
Table for controlling the moving means to display an image on the display panel
Control means and the first drive means during the coordinate detection period.
And sequentially applies a scanning voltage to the first electrode group of the display panel.
While controlling the second driving means to control the second driving means.
Detection control means for scanning by applying a scanning voltage to the electrode group sequentially
And the timing of generation of the output signal from the instruction means.
The scanning timing of the first electrode group or the second electrode group
Coordinates on the display panel indicated by the above-mentioned indicating means
Display-integrated tablet having coordinate detecting means for detecting an image
An apparatus, wherein the detection control means includes a plurality of first electrodes or a plurality of first electrodes.
So that the second electrodes are simultaneously scanned, and the first electrodes are
The electrode having the higher array density of the electrode group and the second electrode group
The number of simultaneously scanned electrodes per group is the lower the array density
More than the number of simultaneously scanned electrodes
Controlling the first driving means and the second driving means as described above.
Display-integrated tablet having a configuration
Device. 3. A first electrode group arranged at a predetermined density.
Of the first group of electrodes arranged at different densities in different directions from the first group of electrodes.
A display panel comprising two electrode groups, and the display panel
Of the first electrode group and the second electrode group
Indicator means having an output electrode at the tip, and driving the first electrode group
A first driving unit that moves, and a second driving unit that drives the second electrode group.
A driving unit, and the first driving unit and the second driving unit during a display period.
Table for controlling the moving means to display an image on the display panel
Control means and the first drive means during the coordinate detection period.
And sequentially applies a scanning voltage to the first electrode group of the display panel.
While controlling the second driving means to control the second driving means.
Detection control means for scanning by applying a scanning voltage to the electrode group sequentially
And the timing of generation of the output signal from the instruction means.
The scanning timing of the first electrode group or the second electrode group
Coordinates on the display panel indicated by the above-mentioned indicating means
Display-integrated tablet having coordinate detecting means for detecting an image
An apparatus, the detection control unit, the first electrode group and the second electrode group
The scanning frequency of the electrode group with the higher array density
Higher than the scanning frequency of the lower electrode group
In addition, a structure for controlling the first driving means and the second driving means.
Display integrated tablet device characterized by having
Place.