JP2000214999A - Display processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the detection precision of pen input and to prevent the resulting deterioration in the follow-up property of display by reproducing the trace of the pen input from detected coordinate values and arranging it on the coordinate system on a liquid crystal panel. SOLUTION: This processor is equipped with a central processing part 1 which performs a series of a thinning-out process, a display process, and a detecting process, the liquid crystal panel 2 which has scanning electrodes and signal electrodes, a pen input part 3 by an electrostatic coupling system, a buffer for pixel coordinates of the liquid crystal panel 2, a main storage part 4 which stores a series of data, a signal electrode control part 5 which applies pulses to the signal electrodes, and a scanning electrode control part 6 which applies pulses to the scanning electrodes. Then the processor is equipped with a detecting process part which is used in common for the coordinate detection of electrode pen input used for display driving. Then a display coordinate acquisition part reproduces the locus of pen input from the detected coordinate values and plots it on the coordinate system on the liquid crystal panel 4. Consequently, pleasant pen input is actualized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrated tablet of an electrostatic coupling system in which display electrodes of a simple matrix liquid crystal panel are also used for detecting coordinates of a pen input. The present invention relates to a display processing device that realizes a display that does not cause discomfort.

[0002]

2. Description of the Related Art The principle of coordinate detection by the electrostatic coupling method will be described. FIG. 15 is a front view of an input detection integrated liquid crystal panel using a conventional electrostatic coupling method, and FIG. 16 is a side view of an input detection integrated liquid crystal panel using the same electrostatic coupling method. Transparent electrodes of the liquid crystal panel (here related to the scanning electrodes) Y1
When a scanning pulse is sequentially applied to Yn, the potential of the detection pen changes due to the capacitance between the detection pen and the transparent electrode. Since the coupling capacitance becomes maximum at a point where the distance between the two is short, it is possible to specify that the electrode applied at the time when the output of the detection pen becomes maximum is the electrode with the pen tip. Subsequently, two-dimensional coordinate values can be obtained by performing the same scanning on the signal electrodes (X1 to Xn).

Next, the principle of display processing will be described. FIG. 17 is a diagram of a unit pixel of a conventional liquid crystal panel having a simple matrix structure, and FIG. 18 is an example diagram of a scanning pulse for displaying a pixel in the liquid crystal panel having the same simple matrix structure. The display processing is performed in units of one pixel.

A pixel means a portion where a scanning electrode and a signal electrode overlap, and displaying means switching a pixel from white to black. To display the specified pixel,
This is a process of applying a scanning pulse for displaying on two scanning electrodes and signal electrodes crossing the pixel.

In a scanning electrode, a selection pulse is applied to an electrode having a pixel to be displayed, and a non-selection pulse is applied to a signal electrode.
When a non-selection pulse other than an ON pulse is simultaneously applied to an electrode having a pixel to be displayed, a designated pixel can be switched from white to black.

A liquid crystal (here, a ferroelectric liquid crystal is used) has a characteristic that it maintains two stable states, and when a certain voltage is applied for a certain period of time, the liquid crystal is inverted and the state is maintained as it is. Therefore, a voltage that does not react must be applied to the pixels other than the designated pixel.

Further, as a general property of liquid crystal, when a DC voltage is applied to a pixel for a long period of time, electrolysis occurs, and the display quality of the pixel may be degraded. It must be devised so as to be in a plus / minus 0 potential state. In the detection process, a voltage dedicated to detection based on these facts is applied.

FIG. 19 is a time-series flow chart of a scanning pulse applied to an electrode in a conventional liquid crystal panel integrated with input detection by an electrostatic coupling method. As shown in FIG. 19, the detection process and the display process are performed in chronological order alternately, so that it is not possible to detect during the display process. That is, the detected point cannot continuously acquire the input pen position. Therefore, it is necessary to interpolate between the detection points using a straight line or the like. Here, a method of interpolating and displaying a straight line between the detection points will be described. FIG. 20 is a diagram when a conventional detection point is interpolated by a straight line and displayed on a liquid crystal panel. FIG. 20A is a diagram in which detected points are plotted in a liquid crystal coordinate system.

When t0, t1, and t2 are detected in the order of detection, a straight line directly connecting t0 and t1 is calculated. t1 and t2 are similarly calculated, and the straight line is as shown in FIG. FIG. 20C shows a plot of this straight line in the coordinate system of the liquid crystal.

In the display processing, in order to display one pixel at a time,
It is necessary to determine the number of pixels to be displayed in advance, and to move to the detection processing when the display pixels are displayed. When two detection points are obtained, a straight line is calculated, all pixels are displayed, and the process proceeds to the next detection process. If the input speed increases, the display processing period is weighted, and the detection period is increased. Is reduced during the entire pen input period. In other words, the number of detection points at the position where the pen input is performed decreases, and there is a risk that information for reproducing the locus of the input pen may be lost. Therefore, there is a method of securing the number of detection points in the pen input period by forcibly shifting to the detection processing after plotting a specified number.
This is to shorten the time required for the display processing period and increase the number of detection processing times.

The method will be described with reference to FIG. FIG.
FIG. 1 is a diagram showing the relationship between display and input in a conventional input detection integrated type liquid crystal panel. Here, the processing is performed with the number of pixels plotted during the display processing period being three or less.

FIG. 21A shows a state from time t0 to time t1. First, the position where the pen is turned on is the detection position of t0. When the pen is turned on,
Since there is no previous detection position, pixels are plotted at the coordinates in the display processing as they are. Next, the process proceeds to the detection process, and the detection point t1 is obtained.

FIG. 21B shows a state from time t1 to time t2. After the detection point t1 is obtained, a process of interpolating between the detection points t0 and t1 is performed in the display processing. Here, it is assumed that the interpolation processing is performed using a straight line.

The interpolated coordinates include four pixels including the detection point t1.

However, since the number of pixels to be plotted in one display processing period is determined to be three or less, the maximum number of three pixels is plotted in this display processing.
The remaining pixels are carried over to the next display processing.

After plotting the three pixels, the process proceeds to a detection process, and a detection point t2 is obtained.

FIG. 21C shows a state from time t2 to time t3. After the detection point t2 is obtained, the interpolation processing is performed in the same manner as described above. The interpolated coordinates become four pixels including the detection t2. However, 1
If you include this pixel because it has been carried over,
Only two pixels are plotted this time, and the rest are carried over in the same way.

After plotting these three pixels, the process proceeds to a detection process, and a detection point t3 is obtained.

As described above, without plotting all the pixels interpolated in the display processing, the time required during the display processing period can be reduced, and the number of times of the detection processing can be increased.
However, on the other hand, during the display processing period, the number of pixels to be plotted is reduced, so that a time lag occurs between the position where the pen is actually input and the position where the plot is performed.

[0020]

In the case of such a time lag, as the pen input speed increases, the distance between the detection points increases, and the pen position and the plot position are further greatly opened. This may cause discomfort to the input. In addition, in the case of a large-screen liquid crystal panel, the number of electrode lines increases, so that in the electrostatic coupling method, the time required for detection increases, and in order to give priority to the number of detection points during the input period, the number of pixels to be displayed is increased. There is a need to further reduce the number and secure the number of detection points.

Therefore, the present invention improves the accuracy of pen input detection in a tablet-integrated liquid crystal display device provided with a detection processing unit of the electrostatic coupling type, and on the other hand, reduces the deterioration of display follow-up performance caused by visual observation. An object of the present invention is to provide a display processing device capable of realizing a comfortable pen input by preventing the display processing using a display method using an objective effect.

[0022]

A display processing apparatus according to the present invention is a simple matrix type liquid crystal having a display processing unit for switching the display of a designated pixel by arbitrarily applying a pulse to a scanning electrode substrate and a signal electrode substrate. The panel is equipped with a detection processing unit that also uses the electrodes used for display driving to detect the coordinates of the pen input, reproduces the trajectory input from the pen from the detected coordinate values, and plots it in the coordinate system on the liquid crystal panel And a display coordinate acquisition unit for performing the operation.

With this configuration, the pen input detection accuracy is improved, and on the other hand, the degradation of display follow-up performance caused by the display method using a visual effect is prevented, so that comfortable pen input can be realized.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first aspect of the present invention is a simple matrix type liquid crystal panel having a display processing unit for switching the display of a designated pixel by arbitrarily applying a pulse to a scanning electrode and a signal electrode. A detection processing unit that also uses the electrodes used for display driving to detect the coordinates of pen input, reproduces the trajectory input by the pen from the detected coordinate values, and obtains display coordinates to be arranged in the coordinate system on the liquid crystal panel Having a part.

According to a second aspect of the present invention, there is provided an interpolation processing section for interpolating so that the position obtained in the detection processing and the previous detection position are continuous. After plotting on the panel, after the plotting is completed, the process proceeds to a detection process period for detecting the position where the pen is input, and after acquiring one input position, the process returns to the display process period again, and both processes are alternately performed. Go.

According to a third aspect of the present invention, an arbitrary number of interpolated pixels are plotted during a display processing period, pixels to be displayed are thinned out, and the remaining pixels are plotted at the end of pen input.

According to a fourth aspect of the present invention, the number of pixels to be plotted during the display processing period is determined according to the input speed of the pen input, and the display pixels are thinned out.

According to a fifth aspect of the present invention, the number of pixels to be plotted during the display processing period is determined according to the mutual angle of the pen-input positions, and the display pixels are thinned out.

(Embodiment 1) FIG. 1 is a block diagram of a display processing device according to Embodiment 1 of the present invention, FIG. 2 is a flowchart of the display processing device, and FIG. 3 is coordinates for the input position and display position. FIG. 4 is a configuration diagram of a data list that stores the input coordinate values, and FIG. 5 is a configuration diagram of a data list that stores display coordinate values when interpolation is performed between the detection points.

Reference numeral 1 denotes a central processing unit that performs a series of processes including a thinning process, a display process, and a detection process. Reference numeral 2 denotes a liquid crystal panel having scanning electrodes and signal electrodes. Reference numeral 3 denotes a pen input unit using an electrostatic coupling method. Reference numeral 4 denotes a buffer for pixel coordinates of the liquid crystal panel and a main storage unit for storing a series of data. 5
Is a signal electrode control unit for applying a pulse to the signal electrode.
Reference numeral 6 denotes a scan electrode control unit that applies a pulse to the scan electrode.

Next, the operation will be described with reference to FIG. It is determined whether the pen switch is pressed or pressed by the pen input unit 3 (step 1). Here, the pen tip is a switch, and the switch is turned on by pressing the pen tip with a certain pressure on the liquid crystal panel, and the mechanism is turned off when the pressing pressure is less than a certain pressure. . This process is repeated until the pen is turned on. When the pen is turned on, the process proceeds to the next step.

Next, the position where the pen is input is acquired by the electrostatic coupling method (step 2). The detected position is converted into a two-dimensional coordinate value P in a liquid crystal coordinate system having the origin at the lower left as shown in FIG. The acquired coordinates are stored in the detected coordinate data list (FIG. 4) (step 3). This list is cleared when the pen is turned on, and the detection coordinates are stored for each detection process in ascending order of the number.

Next, if the number k of detection processes is 1, since the previous detection point does not exist, the next detection point interpolation process is omitted (step 4). Next, the detection point Pk (Xk, Yk)
A detection point interpolation process for filling a pixel between the pixel and the previous detection point Pk-1 (Xk-1, Yk-1) is performed (step 5). Here, a method of interpolating using a straight line is used.

Next, in the detection point interpolation processing, the value of the interpolated pixel coordinates obtained is stored in the interpolated coordinate data list (FIG. 5).
Is stored from data close to the coordinates of the previous detection point (step 6). This list is cleared when the pen is turned on. Further, the FIFO method is used, and data once referred to is deleted, and the remaining data is shifted. In this display process, plotting is performed in the order of the number of pixels from the start number (here, 0) to the end of the interpolation coordinate data in step 6 (step 7).

Here, it is checked whether or not the pen is turned on (step 8). If the pen is OFF, the process ends without moving to the detection process. If it is ON, the process proceeds to the detection process again, and Steps 2 to 8 are repeated until the pen is turned OFF.

(Embodiment 2) FIG. 6 is a flowchart of a display processing apparatus according to Embodiment 2 of the present invention. First, it is determined whether the pen switch is pressed or pressed by the pen input unit 3 (step 11). Here, the pen tip is a switch, and the switch is turned on by pressing the pen tip with a certain pressure on the liquid crystal panel, and the mechanism is turned off when the pressing pressure is less than a certain pressure. . This process is repeated until the pen is turned on. When the pen is turned on, the process proceeds to the next step.

Next, the position where the pen is input is acquired by the electrostatic coupling method (step 12). The detected position is converted into a two-dimensional coordinate value P in a liquid crystal coordinate system having the origin at the lower left as shown in FIG.

Next, the acquired coordinates are the detected coordinate data
It is stored in the list (FIG. 4) (step 13). This list is cleared when the pen is turned on, and the detection coordinates are stored for each detection process in ascending order of the number. Next, when the number k of detection processes is 1, since the previous detection point does not exist, the next detection point interpolation process is omitted (step 1).
4). Next, the detection point Pk (Xk, Yk) and the previous detection point Pk-
A detection point interpolation process for filling pixels between 1 (Xk-1, Yk-1) is performed (step 15). Here, a method of interpolating using a straight line is used.

Next, in the detection point interpolation processing, the value of the obtained interpolation pixel coordinates is stored in the interpolation coordinate data list (FIG. 5).
Is stored from the data close to the coordinates of the previous detection point (step 16). This list is cleared when the pen is turned on. Further, the FIFO method is used, and data once referred to is deleted, and the remaining data is shifted. In the display processing here, step 1
A plot is performed for a specified number of pixels (here, three pixels) from the head number (here, 0) of the interpolation coordinate data No. 6 (step 17). The plotted data for three pixels is deleted from the interpolation coordinate data list as described above. For the number of the pixel to be plotted next time, the third coordinate is 0
In order to shift to the third pixel, it is sufficient to plot from the third pixel.

Next, it is checked whether or not the pen is turned on (step 18). Here, if the pen is OFF, the process does not shift to the detection process but shifts to the process of plotting the remaining pixels. If it is ON, the process proceeds to the detection process again,
Steps 12 to 18 until the pen is turned off
Is repeatedly processed.

Next, all the pixels remaining in the interpolation coordinate data list are plotted (in this case, in numerical order), and the process is terminated (step 19). As described above, according to the present processing method, in order to shorten the time of the display processing period, the number of times of the detection processing is increased, and the position detection accuracy of the pen input can be improved.

(Embodiment 3) FIG. 7 is a table showing the correspondence between the pen input speed and the number of plotted pixels in Embodiment 3 of the present invention.
FIG. 8 is a flowchart of the display processing device, and FIG. 9 is a configuration diagram of a data list for storing the detection data.

In principle, as the pen input speed increases, the distance between the detection points increases. This means that if the number of plotted interpolated pixels is always constant, the larger the distance, the larger the thinned portion. At the end of pen input, if there are many places where the thinned-out portion is embedded and displayed, a sense of incongruity may occur, and the user may feel uncomfortable when inputting with the pen. Also, the speed of pen input is difficult to predict because a human performs input. Therefore, the speed of pen input can be obtained only from the result. Therefore, it is necessary to assume a case where the speed of the next pen input is high. In the present invention, in consideration of these points, here, by the following algorithm,
A thinning process is performed according to the speed of pen input.

The basic concept of the algorithm used here is that if the pen input speed is low, it is assumed that the speed will increase next time, the number of pixels to be plotted is reduced, the number of pixels to be thinned out is increased, and the next detection is performed. To reduce time. This means that when the pen input speed is low, it can be assumed that the display processing can follow the distance between the detection points because the distance between the detection points is short.
It is thought that discomfort is reduced.

It is assumed that the frequency of continuous pen input speed is low, and if the pen input speed is high,
The number of pixels to be plotted is increased, the number of pixels to be thinned is reduced, and the frequency of occurrence of a sense of discomfort in the post-display processing by the thinning processing is reduced.

According to the above algorithm, each speed (V0
Here, the number of plot pixels (D0 to D4) according to V4) is set at five levels, and a correspondence table is shown in FIG.
At the time of display processing, the number of plots according to the speed is determined with reference to the correspondence table.

The process will be described below with reference to the flowchart of FIG.

First, it is determined whether the pen switch is pressed or pressed at the pen input section (step 21).
Here, the pen tip is a switch, and when the pen tip is pressed with the pressure on the liquid crystal panel, the switch is turned on.
N, and is turned off when the pressing pressure becomes lower than a certain pressure. This process is repeated until the pen is turned on. When the pen is turned on, the process proceeds to the next step.

Next, a timer that counts in msec units is prepared in the apparatus, and is reset to 0 and started when the pen input is started (step 22).

Next, the position where the pen is input is obtained by the electrostatic coupling method (step 23). The detected position is converted into a two-dimensional coordinate value P in a liquid crystal coordinate system having the origin at the lower left as shown in FIG. At the end of the detection process, a timer value is obtained (step 24).

Next, when the number of detection processes k is 1, since the previous detection point does not exist, the next detection point interpolation process and pen input speed calculation process are omitted (step 25).
Next, the detection point Pk (Xk, Yk) and the previous detection point Pk-1 (X
k-1 and Yk-1) to perform detection point interpolation processing for filling pixels (step 26). Here, a method of interpolating using a straight line is used.

Next, in the detection point interpolation processing, the value of the obtained interpolation pixel coordinate is stored in the interpolation coordinate data list (FIG. 5).
Is stored from data close to the coordinates of the previous detection point (step 27). This list is cleared when the pen is turned on. Further, the FIFO method is used, and data once referred to is deleted, and the remaining data is shifted.

Next, when the previous detection point has been acquired, the previous timer value Ck-1 is obtained from the detection data list (FIG. 9).
Is obtained, and a difference time Tk is obtained from the current timer value Ck (step 28). Also, the distance L between the previous detection point and the current detection point
k (here, the number of pixels to be interpolated) is obtained, and the pen input speed Vk (the number of pixels / msec) is calculated by Vk = Lk / Tk.

Next, the detected coordinates, the timer value, and the pen input speed (set to 0 when the pen is ON) are registered in the list of FIG. 9 as detection data (step 29). This list is cleared when the pen is turned on, and the detection data is stored for each detection process in ascending order of the number.

Subsequently, the number of plot pixels in the display processing is obtained from the correspondence table of FIG. 7 (step 30). In the display processing here, plotting is performed for the number of pixels determined in step 30 from the head number (here, 0) of the interpolation coordinate data in step 27 (step 31). Then the pen is O
It is checked whether or not N has been set (step 32).
Here, if the pen is OFF, the process does not shift to the detection process but shifts to the process of plotting the remaining pixels.

If it is ON, the process returns to the detection process, and steps 23 to 32 are repeated until the pen is turned OFF. Next, a process of plotting all the pixels remaining in the interpolation coordinate data list (here, in numerical order) is performed, and the process is terminated (step 33).

As described above, according to the present processing method, in addition to improving the detection accuracy, it is possible to reduce the sense of discomfort during the display processing and to provide a comfortable pen input interface.

(Embodiment 4) FIG. 10 is a diagram showing a relationship between a pen input position and a relative angle in Embodiment 4 of the present invention.
1 is a correspondence table of the relative angle and the number of plot pixels, FIG. 12 is a flowchart of the display processing device, FIG. 13 is a diagram of a method of calculating the pen input position angle, and FIG. It is a block diagram.

As the angle with the previous detection point increases, the range of pixels to be displayed becomes narrower. Therefore, visually, it is considered that even if that part is thinned, the influence is small (FIG. 10).
(A)). Conversely, when the angle with the previous detection point is small, the range of pixels to be displayed is widened, and the thinning is visually noticeable (FIG. 10B). Therefore, in consideration of these points, the following algorithm performs the thinning process according to the mutual angles of the positions input by the pen.

The basic concept of the algorithm used here is that when the relative angle is large, the number of pixels to be plotted is reduced, the number of pixels to be thinned out is increased, and the time until the next detection is shortened. For this reason, assuming that a fine relative input is performed when the relative angle is large, consideration is given to preventing pen input information from being lost.

When the relative angle is small, the number of pixels to be plotted is increased, the number of pixels to be thinned out is reduced, and the frequency of occurrence of discomfort in post-display processing by the thinning processing is reduced.

According to the above algorithm, each relative angle (E
0 to E4), the number of plot pixels (D0 to D4)
Here, five levels are set, and the correspondence table is shown in FIG. The relative angle is an absolute value, and at the time of display processing, the number of plots according to the speed is determined with reference to the correspondence table.
The process will be described below with reference to the flowchart of FIG.

First, it is determined whether or not the pen switch is pressed by the pen input unit (step 41).
Here, the pen tip is a switch, and when the pen tip is pressed with the pressure on the liquid crystal panel, the switch is turned on.
N, and is turned off when the pressing pressure becomes lower than a certain pressure. This process is repeated until the pen is turned on. When the pen is turned on, the process proceeds to the next step.

Next, the position where the pen is input is obtained by the electrostatic coupling method (step 42). The detected position is converted into a two-dimensional coordinate value P in a liquid crystal coordinate system having the origin at the lower left as shown in FIG.

Next, when the number k of detection processes is 1, since the previous detection point does not exist, the next detection point interpolation process and the angle calculation process are omitted (step 43).

Next, detection point interpolation processing for filling pixels between the detection point Pk (Xk, Yk) and the previous detection point Pk-1 (Xk-1, Yk-1) is performed (step 44). Here, a method of interpolating using a straight line is used.

Next, in the detection point interpolation processing, the value of the interpolated pixel coordinates obtained is stored in the interpolated coordinate data list (FIG. 5).
Is stored from data close to the coordinates of the previous detection point (step 45). This list is cleared when the pen is turned on. In addition, FIFO (First-in Firsts)
(t-out) method, in which data referred to once is deleted and the remaining data is shifted.

Next, the angle between the previous detection position and the current detection position is calculated according to FIG. 13 (step 46). It is assumed that the reference line in the drawing is parallel to the X axis of the two-dimensional coordinate system in FIG. 3 and has the same direction. The reference line in the figure is parallel to the Y axis and has the same direction. The reference line and the reference line are arranged so as to pass through the previous detection point, and the angle with the current detection point is calculated.

Next, the detected coordinates and angles are used as detected data,
The information is registered in the list of FIG. 14 (step 47). This list is cleared when the pen is turned on, and the detection data is stored for each detection process in ascending order of the number. Next, if the angle Ak-1 exists in the previous detection point data, a relative angle with the angle Ak of the current detection point is calculated (step 48). The formula for calculating the relative angle is obtained below.

E = | (Ak−Ak−1−180) | The relative angle is an absolute value. Next, based on the relative angle E calculated in step 48, the number of plots is determined from the correspondence table of FIG. 11 (step 49). In the display processing here, plotting is performed for the number of pixels determined in step 49 from the start number (here, 0) of the interpolation coordinate data in step 45 (step 50).

Next, it is checked whether or not the pen is turned on (step 51). Here, if the pen is OFF, the process does not shift to the detection process but shifts to the process of plotting the remaining pixels. If it is ON, the process proceeds to the detection process again,
Steps 43 to 52 until the pen is turned off
Is repeatedly processed.

Next, a process of plotting all the pixels remaining in the interpolation coordinate data list (in this case, in numerical order) is performed, and the process ends (step 52). According to this processing method, in addition to improving the detection accuracy, it is possible to reduce an uncomfortable feeling at the time of the display processing and realize an interface using a comfortable pen input.

[0073]

As described above, according to the present invention, it is possible to improve the accuracy of pen input detection and prevent deterioration of display follow-up by using a display method using a visual effect. An interface for simple pen input can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram of a display processing device according to a first embodiment of the present invention.

FIG. 2 is a flowchart of a display processing device according to the first embodiment of the present invention.

FIG. 3 is a coordinate system diagram for an input position and a display position according to the first embodiment of the present invention.

FIG. 4 is a configuration diagram of a data list for storing input coordinate values according to the first embodiment of the present invention;

FIG. 5 is a configuration diagram of a data list storing display coordinate values when interpolation is performed between detection points according to the first embodiment of the present invention;

FIG. 6 is a flowchart of a display processing device according to a second embodiment of the present invention.

FIG. 7 is a diagram showing a correspondence table between a pen input speed and the number of plot pixels in Embodiment 3 of the present invention.

FIG. 8 is a flowchart of a display processing device according to a third embodiment of the present invention.

FIG. 9 is a configuration diagram of a data list for storing detection data according to the third embodiment of the present invention.

FIG. 10 is a diagram illustrating a relationship between a pen input position and a relative angle according to the fourth embodiment of the present invention.

FIG. 11 is a diagram showing a correspondence table between a relative angle and the number of plot pixels in Embodiment 4 of the present invention.

FIG. 12 is a flowchart of a display processing device according to a fourth embodiment of the present invention.

FIG. 13 is a diagram illustrating a pen input position angle calculation method according to the fourth embodiment of the present invention;

FIG. 14 is a configuration diagram of a data list for storing detection data according to the fourth embodiment of the present invention.

FIG. 15 is a front view of a liquid crystal panel integrated with input detection by a conventional electrostatic coupling method.

FIG. 16 is a side view of a liquid crystal panel integrated with input detection by a conventional electrostatic coupling method.

FIG. 17 is a diagram of a unit pixel of a liquid crystal panel having a conventional simple matrix structure.

FIG. 18 shows an example of a scanning pulse for displaying a pixel in a conventional liquid crystal panel having a simple matrix structure.

FIG. 19 is a time-series flowchart of a scanning pulse applied to an electrode in a liquid crystal panel integrated with input detection by a conventional electrostatic coupling method.

FIG. 20 is a diagram when a conventional detection point is interpolated by a straight line and displayed on a liquid crystal panel.

FIG. 21 is a diagram showing the relationship between display and input in a conventional liquid crystal panel integrated with input detection.

[Explanation of symbols]

 Reference Signs List 1 central processing unit 2 liquid crystal panel 3 pen input unit 4 main storage unit 5 signal electrode control unit 6 scan electrode control unit

Continued on the front page F-term (reference)

Claims (5)

[Claims] 1. A simple matrix type liquid crystal panel having a display processing unit for switching display of a designated pixel by arbitrarily applying a pulse to a scanning electrode substrate and a signal electrode substrate, wherein electrodes used for display driving are provided. It has a detection processing unit that also serves as a pen input coordinate detection unit, and has a display coordinate acquisition unit that reproduces the trajectory input by the pen from the detected coordinate values and arranges it in the coordinate system on the liquid crystal panel. Display processing device. 2. An interpolating section for interpolating a position acquired in a detection process and a previous detection position so as to be continuous, and plotting the interpolated pixels on a liquid crystal panel during a display process, After plotting is completed, the process proceeds to a detection processing period for detecting the position where the pen is input. After acquiring one input position, the process returns to the display processing period again, and both processes are alternately performed. The display processing device according to claim 1. 3. The display processing according to claim 2, wherein an arbitrary number of interpolated pixels are plotted during a display processing period, pixels to be displayed are thinned out, and the remaining pixels are plotted at the end of pen input. apparatus. 4. The display processing apparatus according to claim 3, wherein the number of pixels to be plotted during the display processing period is determined according to the input speed of the pen input, and the display pixels are thinned out. 5. The display processing apparatus according to claim 3, wherein the number of pixels to be plotted during the display processing period is determined according to the mutual angles of the pen-input positions, and the display pixels are thinned out.