JP5691501B2 - Touch panel, liquid crystal display element having the same, and touch panel position detection method - Google Patents

Description

  The present invention relates to a touch panel, a liquid crystal display element having the same, and a touch panel position detection method.

In general, a touch panel is known in which when a user presses (touches) the surface, the touch position of the touched substrate is detected to identify the touch position. For example, Patent Document 1 discloses a technique related to a touch panel in which a sensing mechanism is arranged in a liquid crystal display element. In the liquid crystal display device, the substrate of the observer's side the liquid crystal display element, the flex is touched, the electrode formed on the substrate, an electrode formed on a substrate facing the substrate, the contact To do. By detecting the contact between the two electrodes, the liquid crystal display element having the touch panel function can identify the touched point.

JP 2007-95044 A

  In the touch panel that detects the touch of the touched substrate and identifies the touch position as described above, for example, when the user moves the pressing position while pressing the substrate, on the front side and the rear side of the movement, The shape of the substrate may be asymmetric. Such asymmetry of the bent shape of the substrate may cause an error in detecting the touch position.

  Therefore, the present invention provides a touch panel that can accurately detect a touch position, a liquid crystal display element having the touch panel, and a position detection method of the touch panel in a touch panel that detects a touched substrate and identifies a touch position. The purpose is to provide.

To solve the above problems, one aspect of the touch panel of the present invention comprises a substrate detection side, when the substrate of the detection side is touched, a detector for detecting the touch on the substrate of the detection side, wherein the detection unit outputs, on the basis of the detection signal representing a plurality of coordinate values relating to the touch to the detection side of the substrate, comprising: a calculating unit for identifying a data pitch position, the said detection signal Crossing the first axis relating to the touch on the substrate and a plurality of first axis direction signals representing the plurality of coordinate values along a first axis and the touch on the substrate. A plurality of second axis direction signals representing the plurality of coordinate values along the second axis, wherein a maximum value along the first axis of the plurality of coordinate values is Xmax1, The minimum value along the axis is Xmin1, and the maximum value along the second axis is Ym. x1, where Ymin1 is the minimum value along the second axis, the calculation unit is configured to increase the plurality of coordinate values along the first axis based on the first axis direction signal. When it is determined that the time has changed, a coordinate value Xtouch along the first axis of the touched position is calculated based on the following equation (1):
Xtouch = (Xmax1-Xmin1) / XgainP + Xmin1 (1)
Here, 1 ≦ XgainP <2, XgainP indicates that the coordinate value Xtouch along the first axis at the touched position is from the median value of the plurality of coordinate values along the first axis. A value indicating whether the bias is biased in a direction of increasing along the first axis, and based on the first axis direction signal, the plurality of coordinate values along the first axis decrease in time The coordinate value Xtouch along the first axis at the touched position is calculated based on the following equation (2):
Xtouch = (Xmax1-Xmin1) / XgainM + Xmin1 (2)
Here, 2 <XgainM and XgainM indicate how much the coordinate value Xtouch along the first axis of the touched position from the median value of the plurality of coordinate values along the first axis. Is a value that indicates whether to deviate in a direction along one axis, and based on the second axis direction signal, the plurality of coordinate values along the second axis increase in time. When it is determined that the position has changed, a coordinate value Ytouch along the second axis of the touched position is calculated based on the following equation (3):
Ytouch = (Ymax1-Ymin1) / YgainP + Ymin1 (3)
Here, 1 ≦ YgainP <2, YgainP indicates how much the coordinate value Ytouch along the second axis of the touched position is from the median value of the plurality of coordinate values along the second axis. A value indicating whether the bias is biased in the direction of increasing along the second axis, and based on the second axis direction signal, the plurality of coordinate values along the second axis decrease in time The coordinate value Ytouch along the second axis of the touched position is calculated based on the following equation (4):
Ytouch = (Ymax1-Ymin1) / YgainM + Ymin1 (4)
Here, 2 <YgainM and YgainM indicate how much the coordinate value Ytouch along the second axis of the touched position from the median value of the plurality of coordinate values along the second axis. It is a value that represents whether it is biased in the direction of decreasing along the axis of 2 .

In order to solve the above problem, one embodiment of a liquid crystal display element having a touch panel according to the present invention is formed on a pixel electrode formed on a first substrate and a second substrate facing each other with a liquid crystal layer interposed therebetween. a liquid crystal display device of active matrix type having a by opposing electrodes, and a plurality of sense lines formed on the first substrate, opposed to having the counter electrode and the gap, before Symbol second the conduction and a counter electrode when the substrate is touched, a plurality of contact electrodes which are connected to one of said plurality of detection lines, represented by each potential of the detection line, to the second substrate based on the plurality of coordinate values relating to the touch, a calculating unit for identifying a data pitch position, comprising a, the detection line, the signal representing the plurality of coordinate values along the first axis A plurality of first detection lines to be transmitted; Each of the first detection lines and a plurality of second detection lines arranged in a twisted position to transmit a signal representing the plurality of coordinate values along a second axis, and the contact point The electrode includes a plurality of first contact electrodes connected to any one of the plurality of first detection lines, and a plurality of second contacts connected to any of the plurality of second detection lines. The maximum value along the first axis of the plurality of coordinate values is Xmax1, the minimum value along the first axis is Xmin1, and the maximum value along the second axis is Ymax1. When the minimum value along the second axis is Ymin1, the calculation unit is configured to increase the plurality of coordinate values along the first axis based on the potential of the first detection line. When it is determined that the time has changed over time, The coordinate values Xtouch along said first axis position, is calculated based on the following equation (1),
Xtouch = (Xmax1-Xmin1) / XgainP + Xmin1 (1)
Here, 1 ≦ XgainP <2, XgainP indicates that the coordinate value Xtouch along the first axis at the touched position is from the median value of the plurality of coordinate values along the first axis. A value indicating whether the bias is biased in the direction of increasing along the first axis, and the direction of decreasing the plurality of coordinate values along the first axis based on the potential of the first detection line When the coordinate value Xtouch along the first axis of the touched position is determined based on the following equation (2):
Xtouch = (Xmax1-Xmin1) / XgainM + Xmin1 (2)
Here, 2 <XgainM and XgainM indicate how much the coordinate value Xtouch along the first axis of the touched position from the median value of the plurality of coordinate values along the first axis. A value indicating whether the bias is biased in the direction of decreasing along the first axis, and the time in the direction of increasing the plurality of coordinate values along the second axis based on the potential of the second detection line. The coordinate value Ytouch along the second axis of the touched position is calculated based on the following equation (3):
Ytouch = (Ymax1-Ymin1) / YgainP + Ymin1 (3)
Here, 1 ≦ YgainP <2, YgainP indicates how much the coordinate value Ytouch along the second axis of the touched position is from the median value of the plurality of coordinate values along the second axis. A value indicating whether the bias is biased in the direction of increasing along the second axis, and the direction of decreasing the plurality of coordinate values along the second axis based on the potential of the second detection line If it is determined that the touched position has changed over time, a coordinate value Ytouch along the second axis of the touched position is calculated based on the following equation (4):
Ytouch = (Ymax1-Ymin1) / YgainM + Ymin1 (4)
Here, 2 <YgainM and YgainM indicate how much the coordinate value Ytouch along the second axis of the touched position from the median value of the plurality of coordinate values along the second axis. It is a value that represents whether it is biased in the direction of decreasing along the axis of 2 .

In order to solve the above-described problem, an aspect of the touch panel position detection method according to the present invention is to detect the touch on the detection-side substrate when touched, and detect the touch on the detection-side substrate . based on the plurality of coordinate values related to, in the position detecting method for a touch panel to identify the data pitch position, the maximum value along the first axis of said plurality of coordinate values Xmax1, to the first axis The minimum value along the first axis is Xmin1, the maximum value along the second axis intersecting the first axis is Ymax1, and the minimum value along the second axis is Ymin1. When the plurality of coordinate values change in a direction that increases in time, a coordinate value Xtouch along the first axis of the touched position is calculated based on the following equation (1):
Xtouch = (Xmax1-Xmin1) / XgainP + Xmin1 (1)
Here, 1 ≦ XgainP <2, XgainP indicates that the coordinate value Xtouch along the first axis at the touched position is from the median value of the plurality of coordinate values along the first axis. A value indicating whether or not the bias is biased in a direction of increasing along the first axis, and the plurality of coordinate values along the first axis are changed in a direction of decreasing temporally, the touch A coordinate value Xtouch along the first axis of the position is calculated based on the following equation (2):
Xtouch = (Xmax1-Xmin1) / XgainM + Xmin1 (2)
Here, 2 <XgainM and XgainM indicate how much the coordinate value Xtouch along the first axis of the touched position from the median value of the plurality of coordinate values along the first axis. A value indicating whether the value is biased in the direction of decreasing along one axis, and when the plurality of coordinate values along the second axis are changing in a direction of increasing in time, the touched A coordinate value Ytouch along the second axis of the position is calculated based on the following equation (3):
Ytouch = (Ymax1-Ymin1) / YgainP + Ymin1 (3)
Here, 1 ≦ YgainP <2, YgainP indicates how much the coordinate value Ytouch along the second axis of the touched position is from the median value of the plurality of coordinate values along the second axis. A value that indicates whether the bias is biased in a direction that increases along the second axis, and the plurality of coordinate values along the second axis change in a direction that decreases in time, the touch A coordinate value Ytouch along the second axis of the position is calculated based on the following equation (4):
Ytouch = (Ymax1-Ymin1) / YgainM + Ymin1 (4)
Here, 2 <YgainM and YgainM indicate how much the coordinate value Ytouch along the second axis of the touched position from the median value of the plurality of coordinate values along the second axis. It is a value that represents whether it is biased in the direction of decreasing along the axis of 2 .

  ADVANTAGE OF THE INVENTION According to this invention, in the touch panel which detects the bending of the touched board | substrate and pinpoints a touch position, the touch panel which can detect an exact touch position, a liquid crystal display element having the same, and the position detection method of a touch panel Can provide.

The figure which shows the outline of the touchscreen which concerns on the 1st Embodiment of this invention. In the touch panel according to the first embodiment, diagram for explaining the position of the contacts in contact with the common electrode when the touched position and its. In the touch panel according to the first embodiment, diagram for explaining a coordinate which is detected as a touch position. FIG. 4 is a schematic diagram for explaining that the front substrate bends asymmetrically when the touch position is moved in the touch panel according to the first embodiment. The figure for demonstrating the position touched when the touch position moved in the touch panel which concerns on 1st Embodiment, and the position of the contact which contacts a common electrode at that time. In the touch panel according to the first embodiment, when the touch position is moved, views for explaining a coordinate which is detected as a touch position. The flowchart which shows the process example of the touchscreen which concerns on this invention. The flowchart which shows the process example of the touchscreen which concerns on this invention. The flowchart which shows the process example of the touchscreen which concerns on this invention. Diagram illustrating an example of the position of the contacts in contact with the common electrode when the touch position and its for explaining a process example of a touch panel according to the present invention. FIG. 3 is a cut perspective view schematically illustrating a part of another example of the touch panel according to the first embodiment of the present invention. The figure which shows the outline of the structural example of the liquid crystal display device which has a touchscreen which concerns on the 2nd Embodiment of this invention. The figure which shows the outline of the circuit structural example of the back substrate of the liquid crystal display device which has a touchscreen which concerns on the 2nd Embodiment of this invention. The figure which shows the outline of the circuit structural example which concerns on the touchscreen of the liquid crystal display device which has a touchscreen which concerns on the 2nd Embodiment of this invention.

[First Embodiment]
First, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 schematically shows a part of the outline of the touch panel according to the present embodiment. As shown in the cut perspective view, the touch panel has a pair of substrates facing each other with a gap. Of the pair of substrates, the substrate that is bent by being pressed (touched) by the user is referred to as a front substrate 1. A substrate facing the front substrate 1 is referred to as a rear substrate 2.

  A plurality of Y coordinate detection lines 4 are arranged in parallel to each other on the surface of the rear substrate 2 facing the front substrate 1. Further, a plurality of X coordinate detection lines 3 are arranged in parallel to each other at a twisted position where the angle formed with each Y coordinate detection line 4 is 90 °. In this description, as shown in the upper left of FIG. 1, the direction in which the Y coordinate detection line 4 extends is defined as the X axis direction, and the coordinate in the X axis direction is defined as the X coordinate. The direction in which the X coordinate detection line 3 extends is defined as the Y axis direction, and the coordinates in the Y axis direction are defined as the Y coordinates.

Corresponding to a position where the X coordinate detection line 3 and the Y coordinate detection line 4 intersect (hereinafter referred to as an intersection), an X coordinate detection contact electrode 5 is disposed in the vicinity of the intersection. The X coordinate detection contact electrode 5 is connected to the X coordinate detection line 3 constituting the corresponding intersection. Further, in the vicinity of the intersection where the X-coordinate detection contact electrode 5 is arranged, a Y-coordinate detection contact electrode 6 is arranged corresponding to the intersection. The Y coordinate detection contact electrode 6 is connected to a Y coordinate detection line 4 constituting the corresponding intersection. Here, each X coordinate detection line 3 is connected to a plurality of X coordinate detection contact electrodes 5, and each Y coordinate detection line 4 is connected to a plurality of Y coordinate detection contact electrodes 6.
A counter electrode 7 is formed on the surface facing the rear substrate 2 of the front substrate 1. Here, gaps are provided between the X-coordinate detection contact electrode 5 and the counter electrode 7 and between the Y-coordinate detection contact electrode 6 and the counter electrode 7.

  When the front substrate 1 is touched and bent by the user, the X-coordinate detection contact electrode 5 and the counter electrode 7 are electrically connected to each other at the touched portion. As a result, the potential of the X coordinate detection contact electrode 5 that is electrically connected to the counter electrode 7 and the potential of the X coordinate detection line 3 connected to the contact electrode are equal to the potential of the counter electrode 7. Similarly, when the front substrate 1 is touched and bent by the user, the Y coordinate detection contact electrode 6 and the counter electrode 7 are electrically connected to each other at the touched portion. As a result, the potential of the Y coordinate detection contact electrode 6 that is electrically connected to the counter electrode 7 and the potential of the Y coordinate detection line 4 connected to the contact electrode are equal to the potential of the counter electrode 7. Therefore, the coordinate detection controller 10 measures the potential of the X coordinate detection line 3 and identifies the X coordinate detection line 3 whose potential is equal to that of the counter electrode 7. X coordinate can be acquired. Similarly, the coordinate detection controller 10 measures the potential of the Y coordinate detection line 4 and identifies the Y coordinate detection line 4 whose potential is equal to that of the counter electrode 7, thereby touching the position. Can be obtained.

  Thereafter, as shown in FIG. 2, 20 X coordinate detection lines 3 are arranged in the X axis direction, 20 Y coordinate detection lines 4 are arranged in the Y axis direction, and the X coordinate detection line 3 and the Y coordinate detection line 4 are An explanation will be given by taking as an example a case where the X coordinate detection contact electrode 5 and the Y coordinate detection contact electrode 6 are arranged at each intersection. Here, the X coordinates are 1 to 20 in order from right to left in FIG. 2, and these are shown in the upper part in FIG. 2 in association with each X coordinate detection line 3. Similarly, the Y coordinates are 1 to 20 in order from top to bottom in FIG. 2, and these are associated with each Y coordinate detection line 4 and are shown on the right side in FIG. 2. Here, the detection point of 20 points × 20 points is, of course, an example, and this number is usually larger.

  As shown in FIG. 2, it is assumed that the user touches coordinates (X, Y) = (4, 3) indicated by black circles. Here, it is assumed that the touched point is stationary. At this time, the X-coordinate detection contact electrode 5 and the Y-coordinate detection contact electrode 6 located at the coordinates (X, Y) = (4, 3) indicated by black circles in FIG. To do. At this time, the size of the tip of the user's finger or stylus pen used for the touch is larger than the interval between the X coordinate detection lines 3 and the interval between the Y coordinate detection lines 4. Since the area to be bent is wider than the size of the tip of the user's finger or stylus pen, the X coordinate detection contact electrode 5 and the Y coordinate detection contact are wider than the portion intended to be touched by the user. The electrode 6 is in contact with the counter electrode 7. That is, for example, coordinates (X, Y) = (2, 2), (2, 3), (2, 4), (3, 1), (3, 2), (3, 3) indicated by white circles ), (3,4), (3,5), (4,2), (4,4), (4,5), (5,1), (5,2), (5,3), The X coordinate detection contact electrode 5 and the Y coordinate detection contact electrode 6 located at (5, 4), (6, 2), (6, 3), (6, 4), (6, 5) are also opposed. Contact the electrode 7.

  As a result, the potential of the X coordinate detection line 3 whose X axis coordinate is X = 2, 3, 4, 5, 6 is equal to the potential of the counter electrode 7. Similarly, the potential of the Y coordinate detection line 4 whose Y axis coordinate is Y = 1, 2, 3, 4, 5 is equal to the potential of the counter electrode 7. That is, the coordinate detection controller 10 detects contact at each point indicated by a hatched circle shown in FIG.

  When the touched position is stationary, the operation is as described above. However, when the touched position is moving, the operation is as follows. 4A, for example, when the stylus pen 90 used by the user moves while pressing the front substrate 1, the front substrate 1 bends asymmetrically. This is different from the case where the touched position is stationary as shown in the schematic diagram of FIG. For example, the stylus pen 90 moves on the front substrate 1 from the state where the coordinates (X, Y) = (4, 3) are touched, and the touch position is the coordinates (X, Y indicated by black circles in FIG. 5. ) = (12, 11). At this time, the X-coordinate detection contact electrode 5 and the Y-coordinate detection contact electrode 6 located at the coordinates (X, Y) = (12, 11) indicated by black circles in FIG. At the same time, since the front substrate 1 bends as shown in FIG. 4A, for example, the coordinates (X, Y) = (represented by white circles in FIG. 8,8), (8,9), (9,8), (9,9), (9,10), (10,7), (10,8), (10,9), (10, X coordinate detection located at 10), (11, 7), (11, 8), (11, 9), (11, 10), (11, 11), (12, 9), (12, 10) The contact electrode 5 and the Y-coordinate detection contact electrode 6 are also in contact with the counter electrode 7.

  As a result, the potential of the X coordinate detection line 3 whose X axis coordinates are X = 8, 9, 10, 11, 12 is equal to the potential of the counter electrode 7. Similarly, the potential of the Y coordinate detection line 4 whose Y axis coordinates are Y = 7, 8, 9, 10, and 11 is equal to the potential of the counter electrode 7. That is, the coordinate detection controller 10 detects contact at each point indicated by a hatched circle shown in FIG.

  When the touched point is stationary, the coordinate detection controller 10 may specify the center point of the plurality of coordinates at which contact is detected as the coordinates touched by the user. For example, when the coordinates (4, 3) shown in FIG. 2 are touched, the coordinate detecting controller 10 detects the centers of a plurality of points detected as touches indicated by hatched circles in FIG. In this case, the coordinates (4, 3) may be specified as the touched point.

  On the other hand, when the touched point is moving, the user touches the center point of the plurality of coordinates at which contact is detected, as in the case where the touched point is stationary. When specified as coordinates, it is as follows. For example, when the coordinates (12, 11) shown in FIG. 5 are touched, the coordinate detection controller 10 detects the centers indicated by the hatched circles in FIG. In this case, if the coordinates (10, 9) are specified as a touched point, a deviation from the actually touched point occurs. That is, an error occurs at a point specified as being touched. In this embodiment, processing for correcting this error is performed.

  Processing of the coordinate detection controller 10 of the touch panel according to the present embodiment will be described with reference to flowcharts shown in FIGS. 7A, 7B, and 7C. This process is a loop process that is repeatedly executed every predetermined time, for example, every 10 ms. This cycle is normally synchronized with the cycle for detecting the touch position.

In step S1, the coordinate detection controller 10 determines whether or not the touch panel is touched, i.e., of the X coordinate detection line 3 and the Y coordinate detection line 4, the potential thereof is equal to the potential of the counter electrode 7 It is determined whether or not there is.
If it is determined in step S1 that the touch panel is not touched (No), the coordinate detection controller 10 sets the detection flag FLG1 to 0 in step S2. This detection flag FLG1 is a flag indicating whether or not the touch panel has been touched in the previous cycle.

In step S3, the coordinate detection controller 10 sets both XCNT1 and XCNT2, which are X coordinate motion detection counters, to zero. Here, XCNT1 is a variable that counts the number of times the X coordinate of the touch position moves in the direction (left side), and XCNT2 counts the number of times the touch position moves in the direction (right side) that the X coordinate decreases. Variable.
In step S4, the coordinate detection controller 10 sets both YCNT1 and YCNT2, which are Y coordinate motion detection counters, to zero. Here, YCNT1 is a variable that counts the number of times that the Y coordinate of the touch position has moved in the direction of increasing (lower side), and YCNT2 is the number of times that the Y coordinate of the touch position has moved in the direction of decreasing (upward). The variable to count. Thereafter, the coordinate detection controller 10 moves the process to step S42.

On the other hand, in the judgment of step S1, if the touch panel is determined to be touched (Yes), in step S5, coordinate detection controller 10 of the X coordinate detection line 3 and the Y coordinate detection line 4, An analysis is performed to identify a potential whose potential is equal to the potential of the counter electrode 7. That is, for example, the detected X coordinate and Y coordinate corresponding to the hatched circles in FIGS. 3 and 6 are specified.

In step S6, the coordinate detection controller 10 determines whether or not the value of the detection flag FLG1 is 1.
If it is determined in step S6 that the value of the detection flag FLG1 is 1 (Yes), in step S7, the coordinate detection controller 10 sets the maximum value of the previous X coordinate to Xmax2 indicating the maximum value of the previous X coordinate at this time. Set the value of Xmax1, which is the maximum value of the X coordinate in the previous processing cycle. Similarly, the coordinate detection controller 10 sets the value of Ymax1 at which the maximum value of the Y coordinate in the previous processing cycle is set at this time to Ymax2 indicating the maximum value of the previous Y coordinate. Similarly, the coordinate detection controller 10 sets the value of Xmin1 in which the minimum value of the X coordinate in the previous processing cycle is set at this time to Xmin2 indicating the minimum value of the previous X coordinate. Similarly, the coordinate detection controller 10 sets the value of Ymin1 at which the minimum value of the Y coordinate in the previous processing cycle is set at Ymin2 indicating the minimum value of the previous Y coordinate.

In step S8, the coordinate detection controller 10 sets the maximum value of the X coordinate detected in step S5 to Xmax1, and sets the minimum value of the X coordinate to Xmin1.
Similarly, in step S9, the coordinate detection controller 10 sets the maximum value of the Y coordinate detected in step S5 to Ymax1, and sets the minimum value of the Y coordinate to Ymin1. Next, the coordinate detection controller 10 moves the process to step S14.

On the other hand, if it is determined in step S6 that the value of the detection flag FLG1 is not 1 (No), the coordinate detection controller 10 sets the detection flag FLG1 to 1 in step S10.
Subsequently, in step S11, the coordinate detection controller 10 sets the maximum value of the X coordinate detected in step S5 to Xmax1, and sets the minimum value of the X coordinate to Xmin1.
Similarly, in step S12, the coordinate detection controller 10 sets the maximum value of the Y coordinate detected in step S5 to Ymax1, and sets the minimum value of the Y coordinate to Ymin1.

In step S13, the coordinate detection controller 10 sets the value of Xmax1 to Xmax2, sets the value of Ymax1 to Ymax2, sets the value of Xmin1 to Xmin2, and sets the value of Ymin1 to Ymin2. Thus, in the touched with the first cycle, the value of the Xmax2 and Xmax1, the value of the Ymax2 and Ymax1, the value of the Xmin2 and Xmin1, and respectively equal the value of the Ymin2 and Ymin1. Next, the coordinate detection controller 10 moves the process to step S14.

In step S14, the coordinate detection controller 10 determines whether or not Xmax1-Xmax2> Detect_Level1. As a result of the determination in step S14, when Xmax1-Xmax2> Detect_Level1 (Yes), that is, in the direction (left side) in which the value of the X coordinate of the touch position increases from the previous processing cycle to the current processing cycle. When it is determined that it is moving, the coordinate detection controller 10 moves the process to step S15.

In step S15, the coordinate detection controller 10 determines whether or not XCNT1 <Cnt_Level1. As a result of this determination, when XCNT1 <Cnt_Level1 (Yes), that is, when the number of times of movement (cycle number) in the direction (left side) in which the X coordinate value of the touch position increases is smaller than the predetermined number of times (Cnt_Level1), The coordinate detection controller 10 moves the process to step S16.

In step S16, the coordinate detection controller 10 increments the value of the X coordinate motion detection counter XCNT1 by one.
In step S17, the coordinate detection controller 10 sets the value of the X coordinate motion detection counter XCNT2 to zero.
In step S18, the coordinate detection controller 10 calculates the average of the X coordinates detected in step S5, that is, the average value of Xmax1 and Xmin1 (averaging process), thereby obtaining the X coordinate Xtouch of the touch position. decide. Thereafter, the coordinate detection controller 10 moves the process to step S28.

  On the other hand, as a result of the determination in step S15, when XCNT1 <Cnt_Level1 is not satisfied (No), that is, when the X coordinate value of the touch position increases (left side) continuously for a predetermined number of times (Cnt_Level1), In step S19, the coordinate detection controller 10 calculates the X coordinate Xtouch of the touch position based on the following equation (1).

Xtouch = (Xmax1-Xmin1) / XgainP + Xmin1 (1)
Here, XgainP is a predetermined value, and is a value representing how much the X coordinate Xtouch at the position specified as touched is biased to the left from the average of the detected X coordinates. For example, when XgainP = 1, the X coordinate Xtouch of the touch position is Xmax1, that is, the leftmost coordinate among the detected coordinates. Thereafter, the coordinate detection controller 10 moves the process to step S28.

  As a result of the determination in step S14, when Xmax1-Xmax2> Detect_Level1 is not satisfied (No), that is, when it is determined that the touch position has not moved to the left from the previous processing cycle to the current processing cycle, for coordinate detection The controller 10 moves the process to step S20.

In step S20, the coordinate detection controller 10 sets the value of the X coordinate motion detection counter XCNT1 to zero.
In step S21, the coordinate detection controller 10 determines whether or not Xmin2-Xmin1> Detect_Level3. As a result of the determination in step S21, when Xmin2-Xmin1> Detect_Level3 (Yes), that is, in the direction (right side) in which the value of the X coordinate of the touch position decreases between the previous processing cycle and the current processing cycle. When it is determined that it is moving, the coordinate detection controller 10 moves the process to step S22.

  In step S22, the coordinate detection controller 10 determines whether or not XCNT2 <Cnt_Level3. As a result of this determination, when XCNT2 <Cnt_Level3 (Yes), that is, when the X coordinate value of the touch position has not continuously moved in the direction (right side) a predetermined number of times (Cnt_Level3) or more The controller 10 moves the process to step S23.

In step S23, the coordinate detection controller 10 increments the value of the X coordinate motion detection counter XCNT2.
In step S24, the coordinate detection controller 10 calculates the average of the X coordinates detected in step S5, that is, the average value of Xmax1 and Xmin1 (averaging process), thereby obtaining the X coordinate Xtouch of the touch position. decide. Thereafter, the coordinate detection controller 10 moves the process to step S28.

  On the other hand, as a result of the determination in step S22, when XCNT2 <Cnt_Level3 is not satisfied (No), that is, when the X coordinate value of the touch position is decreased (right side) continuously moving a predetermined number of times (Cnt_Level3) or more, In step S25, the coordinate detection controller 10 calculates the X coordinate Xtouch of the touch position based on the following equation (2).

Xtouch = (Xmax1-Xmin1) / XgainM + Xmin1 (2)
Here, XgainM is a predetermined value, and XgainM is a value representing how much the X coordinate Xtouch at the position specified as touched is biased to the right from the average of the detected X coordinates. For example, if XgainM = ∞, the position specified to be touched is Xmin1, that is, the rightmost coordinate of the detected coordinates. Thereafter, the coordinate detection controller 10 moves the process to step S28.

  As a result of the determination in step S21, when Xmin2-Xmin1> Detect_Level3 is not satisfied (No), that is, when it is determined that the touch position has not moved to the right side from the previous processing cycle to the current processing cycle, that is, When it is determined that neither the right side nor the left side is moving, the coordinate detection controller 10 moves the process to step S26.

In step S26, the coordinate detection controller 10 sets the value of the X coordinate motion detection counter XCNT2 to zero.
In step S27, the coordinate detection controller 10 calculates the average of the X coordinates detected in step S5, that is, the average value of Xmax1 and Xmin1 (averaging process), thereby obtaining the X coordinate Xtouch of the touch position. decide. Thereafter, the coordinate detection controller 10 moves the process to step S28.

  In step S28, the coordinate detection controller 10 determines whether or not Ymax1-Ymax2> Detect_Level2. When the result of determination in step S28 is Ymax1-Ymax2> Detect_Level2 (Yes), that is, the direction in which the Y coordinate value increases (downward) from the previous processing cycle to the current processing cycle. When it is determined that the controller 10 is moving, the coordinate detection controller 10 moves the process to step S29.

In step S29, the coordinate detection controller 10 determines whether or not YCNT1 <Cnt_Level2. As a result of this determination, if YCNT1 <Cnt_Level2 (Yes), that is, if the Y coordinate value of the touch position does not move continuously in the direction of increasing (downward) a predetermined number of times (Cnt_Level2) or more, coordinate detection The controller 10 moves the process to step S30.
In step S30, the coordinate detection controller 10 increments the value of the Y coordinate motion detection counter YCNT1 by one.
In step S31, the coordinate detection controller 10 sets the value of the Y coordinate motion detection counter YCNT2 to zero.
In step S32, the coordinate detection controller 10 calculates the average of the Y coordinates detected in step S5, that is, the average value of Ymax1 and Ymin1 (averaging process), thereby obtaining the Y coordinate Ytouch of the touch position. decide. Thereafter, the coordinate detection controller 10 moves the process to step S42.

  On the other hand, as a result of the determination in step S29, when YCNT1 <Cnt_Level2 is not satisfied (No), that is, when the Y coordinate value at the touch position increases (downward) continuously for a predetermined number of times (Cnt_Level2) or more. In step S33, the coordinate detection controller 10 calculates the Y coordinate Ytouch of the touch position based on the following equation (3).

Ytouch = (Ymax1-Ymin1) / YgainP + Ymin1 (3)
Here, YgainP is a predetermined value, and YgainP is a value indicating how much the Y coordinate Ytouch at the position specified as touched is biased downward from the average of the detected Y coordinates. . For example, if YgainP = 1, the Y coordinate Ytouch of the touch position is Ymax, that is, the coordinate of the lower end of the detected coordinates. Thereafter, the coordinate detection controller 10 moves the process to step S42.

Result of the determination in step S28, when not Ymax1-Ymax2> Detect_Level2 (No) , i.e., during the period from the previous processing cycle to the present processing cycle, when the touch position is determined as not moving downward, coordinate The detection controller 10 moves the process to step S34.

In step S34, the coordinate detection controller 10 sets the value of the Y coordinate motion detection counter YCNT1 to zero.
In step S35, the coordinate detection controller 10 determines whether or not Ymin2-Ymin1> Detect_Level4. As a result of the determination in step S35, when Ymin2−Ymin1> Detect_Level4 (Yes), that is, between the previous routine and the current routine, the touch position moves in the direction in which the Y coordinate value decreases (upward). When it is determined that there is, the coordinate detection controller 10 moves the process to step S36.

In step S36, the coordinate detection controller 10 determines whether or not YCNT2 <Cnt_Level4. As a result of this determination, if YCNT2 <Cnt_Level4 (Yes), that is, if the Y coordinate value of the touch position has not been continuously moved in the direction of decreasing (upward) a predetermined number of times (Cnt_Level4) or more, The controller 10 moves the process to step S37.
In step S37, the coordinate detection controller 10 increases the value of the Y coordinate motion detection counter YCNT2 by one.
In step S38, the coordinate detection controller 10 calculates the average of the Y coordinates detected in step S5, that is, the average value of Ymax1 and Ymin1 (averaging process), thereby obtaining the Y coordinate Ytouch of the touch position. decide. Thereafter, the coordinate detection controller 10 moves the process to step S42.

  On the other hand, as a result of the determination in step S36, when YCNT2 <Cnt_Level4 is not satisfied (No), that is, when the Y coordinate value of the touch position decreases (upward) continuously for a predetermined number of times (Cnt_Level4), In step S39, the coordinate detection controller 10 calculates the Y coordinate Ytouch of the touch position based on the following equation (4).

Ytouch = (Ymax1-Ymin1) / YgainM + Ymin1 (4)
Here, YgainM is a predetermined value, and YgainM is a value representing how much the Y coordinate Ytouch at the position specified as touched is biased upward from the average of the detected Y coordinates. For example, if YgainM = ∞, the position specified to be touched is Ymin1, that is, the coordinates of the upper end of the detected coordinates. Thereafter, the coordinate detection controller 10 moves the process to step S42.

  As a result of the determination in step S35, when Ymin2-Ymin1> Detect_Level4 is not satisfied (No), that is, when it is determined that the touch position has not moved upward from the previous routine to the current routine, that is, up If it is determined that the robot has not moved downward, the coordinate detection controller 10 moves the process to step S40.

In step S40, the coordinate detection controller 10 sets the value of the Y coordinate motion detection counter YCNT2 to zero.
In step S41, the coordinate detection controller 10 calculates the average of the Y coordinates detected in step S5, that is, the average value of Ymax1 and Ymin1 (averaging process), thereby obtaining the Y coordinate Ytouch of the touch position. decide. Thereafter, the coordinate detection controller 10 moves the process to step S42.

  In step S <b> 42, the coordinate detection controller 10 determines whether or not the end of the process for specifying the touch position is requested. As a result of this determination, when there is no termination request (No), the coordinate detection controller 10 returns the process to step S1. On the other hand, when there is an end request (Yes), the coordinate detection controller 10 ends the process.

  Thus, for example, the front substrate 1 functions as a detection-side substrate, and for example, the X-coordinate detection contact electrode 5 and the Y-coordinate detection contact electrode 6 function as a detection unit that detects bending of the detection-side substrate. For example, the coordinate detection controller 10 functions as a calculation unit that identifies the touched position. Here, as coordinates relating to the center of a plurality of coordinates at the position where the front substrate 1 is bent, for example, coordinates obtained by an averaging process for calculating an average value of Xmax1 and Xmin1 are used. However, the calculation of coordinates here is not limited to a simple average, and may be obtained by other methods such as calculation using weighting according to the position on the touch panel.

  An outline of an operation example of the touch panel according to the above-described embodiment will be described with reference to FIG. As shown in FIG. 8, it is assumed that the user first touches coordinates (X, Y) = (4, 3). At this time, in FIG. 8, the user touches the coordinates of the black circles in the area A surrounded by the broken line, but signals derived from the points indicated by the white circles are also detected. Next, the user moves the touch position. At this time, the coordinates of the position touched by the user at the time of detection according to the processing interval of the coordinate detection controller 10 are coordinates (X, Y) = (12, 11), (18, 17), ( 8,17) and (1,17). At this time, in FIG. 8, the user touches the coordinates of the black circles in the areas B, C, D, and E surrounded by broken lines, but the white circles indicate the respective coordinates. Signals originating from points are also detected. Considering such a situation, the following will be described.

  In this description, it is assumed that Detect_Level1, Detect_Level2, Detect_Level3, and Detect_Level4 are all set to 3. Also, it is assumed that Cnt_Level1, Cnt_Level2, Cnt_Level3, and Cnt_Level4 are all set to 1. It is assumed that XgainP and YgainP are set to 1, and XgainM and YgainM are set to ∞, respectively.

  First, in the first cycle, in step S1, it is determined that the touch is made (Yes). In step S5, the output of the X coordinate detection line is X = 2, 3, 4, 5, 6, and the Y coordinate. It is detected that the output of the detection line is Y = 1, 2, 3, 4, 5. Next, in step S6, it is determined that the detection flag FLG1 is not 1 (No). In step S10, the detection FLG1 is set to 1. In step S11, Xmax1 is set to 6 and Xmin1 is set to 2. In step S12, Ymax1 is set to 5 and Ymin1 is set to 1. In step S13, 6 is set in Xmax2, 5 is set in Ymax2, 2 is set in Xmin2, and 1 is set in Ymin2.

Next, in step S14, it is not greater than Xmax1-Xmax2 = 0 is Detect_Level1 = 3 (No), in step S20, X-coordinate motion detection counter XCNT1 is set to 0. In step S21, it is determined that Xmin2-Xmin1 = 0 is not larger than Detect_Level3 = 3 (No), and in step S26, the X coordinate motion detection counter XCNT2 is set to zero. In step S27, the X coordinate Xtouch of the touch position is determined to be 4 by the averaging process.

Next, in step S28, it is not greater than Ymax1-Ymax2 = 0 is Detect_Level2 = 3 (No), in step S34, Y-coordinate motion detection counter YCNT1 is set to 0. In step S35, it is determined that Ymin2-Ymin1 = 0 is not larger than Detect_Level4 = 3 (No), and in step S40, the Y coordinate motion detection counter YCNT2 is set to zero. In step S41, the Y coordinate Ytouch of the touch position is determined to be 3 by the averaging process.
As described above, in the first cycle, the coordinates of the touch position are specified as (X, Y) = (4, 3). Thereafter, the process returns to step S1, and the process in the second cycle is performed.

  In step S1, in the second cycle, it is determined that the touch is made (Yes). In step S5, the output of the X coordinate detection line is X = 8, 9, 10, 11, 12, and the Y coordinate detection line. Are detected as Y = 7, 8, 9, 10, and 11. Next, in step S6, it is determined that the detection flag FLG1 is 1 (Yes). In step S7, Xmax2 is set to 6, Xmin2 is set to 2, Ymax2 is set to 5, and Ymin2 is set to 1. In step S8, Xmax1 is set to 12, and Xmin1 is set to 8. In step S9, Ymax1 is set to 11 and Ymin1 is set to 7.

In step S14, it is determined that Xmax1-Xmax2 = 6 is greater than Detect_Level1 = 3 (Yes). In step S15, it is determined that XCNT1 = 0 is smaller than CNT_Level1 = 1 (Yes), XCNT1 is set to 1 in step S16, and XCNT2 is set to 0 in step S17. In step S18, the X coordinate Xtouch of the touch position is determined to be 10 by the averaging process.

Next, in step S28, it is determined that Ymax1-Ymax2 = 6 is greater than Detect_Level2 = 3 (Yes). In step S29, it is determined that the Y coordinate motion detection counter YCNT1 = 0 is smaller than CNT_Level2 = 1 (Yes), YCNT1 is set to 1 in step S30, and YCNT2 is set to 0 in step S31. In step S32, the Y coordinate Ytouch of the touch position is determined to be 9 by the averaging process.
As described above, in the second cycle, the coordinates of the touch position are specified as (X, Y) = (10, 9). Thereafter, the process returns to step S1, and the process in the third cycle is performed.

  In step S1, in the third cycle, it is determined that the touch is made (Yes), and in step S5, the output of the X coordinate detection line is X = 14, 15, 16, 17, 18 and the Y coordinate detection line. Are detected as Y = 13, 14, 15, 16, and 17. Next, in step S6, it is determined that the detection flag FLG1 is 1 (Yes). In step S7, Xmax2 is set to 12, Xmin2 is set to 8, Ymax2 is set to 11, and Ymin2 is set to 7. In step S8, Xmax1 is set to 18 and Xmin1 is set to 14. In step S9, Ymax1 is set to 17, and Ymin1 is set to 13.

In step S14, it is determined that Xmax1-Xmax2 = 6 is greater than Detect_Level1 = 3 (Yes). In step S15, it is determined that XCNT1 = 1 is not smaller than CNT_Level1 = 1 (No). In step S19, based on the processing when there is a movement, that is, the X coordinate Xtouch of the touch position based on the equation (1). Is determined to be 18.

Next, in step S28, it is determined that Ymax1-Ymax2 = 6 is greater than Detect_Level2 = 3 (Yes). In step S29, it is determined that the Y coordinate motion detection counter YCNT1 = 1 is not smaller than CNT_Level2 = 1 (No), and in step S33, based on the processing when there is motion, that is, based on the equation (3), The Y coordinate Ytouch of the touch position is determined to be 17.
As described above, in the third cycle, the coordinates of the touch position are specified as (X, Y) = (18, 17). Thereafter, the process returns to step S1, and the fourth cycle process is performed.

  In step S1, in the fourth cycle, it is determined that the touch is made (Yes). In step S5, the output of the X coordinate detection line is X = 8, 9, 10, 11, 12, and the Y coordinate detection line. Are detected as Y = 15, 16, 17, 18, and 19. Next, in step S6, it is determined that the detection flag FLG1 is 1 (Yes). In step S7, Xmax2 is set to 18, Xmin2 is set to 14, Ymax2 is set to 17, and Ymin2 is set to 13. In step S8, Xmax1 is set to 12, and Xmin1 is set to 8. In step S9, Ymax1 is set to 19 and Ymin1 is set to 15.

Next, in step S14, is not greater than Xmax1-Xmax2 = -6 is Detect_Level1 = 3 (No). In step S20, the X coordinate motion detection counter XCNT1 is set to zero. In step S21, it is determined that Xmin2−Xmin1 = 6 is greater than Detect_Level1 = 3 (Yes). In step S22, it is determined that XCNT2 = 0 is smaller than CNT_Level3 = 1 (Yes). In step S23, the X coordinate motion detection counter XCNT2 is set to 1. In step S24, the X coordinate Xtouch of the touch position is determined to be 10 by the averaging process.

Next, in step S28, it is determined that Ymax1-Ymax2 = 2 is not greater than Detect_Level2 = 3 (No). In step S34, the Y coordinate motion detection counter YCNT1 is set to zero. In step S35, it is determined that Ymin2-Ymin1 = -2 is not greater than Detect_Level4 = 3 (No). In step S40, the Y coordinate motion detection counter YCNT2 is set to zero. In step S41, the Y coordinate Ytouch of the touch position is determined to be 17 by the averaging process.
As described above, in the fourth cycle, the coordinates of the touch position are specified as (X, Y) = (10, 17). Thereafter, the process returns to step S1, and the fifth cycle process is performed.

  In step S1, in the fifth cycle, it is determined that the touch is made (Yes). In step S5, the output of the X coordinate detection line is X = 1, 2, 3, 4, 5, and the Y coordinate detection line. Are detected as Y = 15, 16, 17, 18, and 19. Next, in step S6, it is determined that the detection flag FLG1 is 1 (Yes). In step S7, Xmax2 is set to 12, Xmin2 is set to 8, Ymax2 is set to 19, and Ymin2 is set to 15. In step S8, Xmax1 is set to 5, and Xmin1 is set to 1. In step S9, Ymax1 is set to 19 and Ymin1 is set to 15.

Next, in step S14, it is determined that Xmax1-Xmax2 = -7 is not larger than Detect_Level1 = 3 (No). In step S20, the X coordinate motion detection counter XCNT1 is set to zero. In step S21, Xmin2-Xmin1 = 7 is determined to be greater than Detect_Level1 = 3 (Yes). In step S22, it is determined that XCNT2 = 1 is not smaller than CNT_Level3 = 1 (No). In step S25, the X coordinate Xtouch of the touch position is determined to be 1 based on the processing when there is a movement, that is, based on the equation (2).

Next, in step S28, it is determined that Ymax1-Ymax2 = 0 is not larger than Detect_Level2 = 3 (No). In step S34, the Y coordinate motion detection counter YCNT1 is set to zero. In step S35, it is not greater than Ymin2-Ymin1 = 0 is Detect_Level4 = 3 (No). In step S40, the Y coordinate motion detection counter YCNT2 is set to zero. In step S41, the Y coordinate Ytouch of the touch position is identified as 17 by the averaging process.
As described above, in the fifth cycle, the coordinates of the touch position are determined to be (X, Y) = (1, 17). Thereafter, the process ends.

  In this example, as described above, the point touched by the user in the first cycle, the second cycle, the third cycle, the fourth cycle, and the fifth cycle is in the order of coordinates (X, Y) = (4, 3 ), (12, 11), (18, 17), (8, 17), (1, 17). If the touched coordinates are specified for all of these by the averaging process, coordinates (X, Y) = (4, 3), (10, 9), (16, 15), (10 , 17) and (3, 17) are determined as touched points. On the other hand, according to the present embodiment, coordinates (X, Y) = (4, 3), (10, 9), (18, 17), (10, 17), (1, 17) are touched in order. Is determined as the point that has been. As described above, according to the present embodiment, the coordinate calculation method to be determined as a touched point is changed according to the stationary or moving of the touch position, so that it is possible to perform more accurate and accurate detection. ing.

In the above example, Cnt_Level1, Cnt_Level2, Cnt_Level3, and Cnt_Level4 are all set to 1, so that the correction is performed when moving continuously in the same direction twice or more. This value can be set arbitrarily according to the characteristics of the apparatus, the usage situation, and the like. Further, Detect_Level1, Detect_Level2, Detect_Level3, Detect_Level4 is, since all set to 3, when moving larger than coordinate three minutes, it is determined that the touch position moves the processing is performed, the value Can also be set arbitrarily.

  Further, as in this embodiment, XgainP, YgainP, XgainM, and YgainM are not fixed fixed values, but are changed according to the amount of movement of the touch position, that is, the distance moved within a predetermined time. As a result, a more accurate touch position can be detected.

  As described above, according to the present embodiment, in the touch panel that detects the bending of the substrate on the user side and specifies the touch position, it detects whether the touched position is stationary or moving, Accordingly, since the method for determining the touch position is made different, it is possible to specify the touch position accurately regardless of whether the touch position is stationary or moving.

In the description of this embodiment, by the X coordinate detection electrode 5 and the Y coordinate detection electrode 6 and the counter direction electrode 7 is in contact, it has been described as a touch panel for detecting a coordinate as an example, Any other type of touch panel can be applied as long as it is a method that detects the bending due to the touch of the substrate on the user side. For example, you may apply in the touchscreen which pinpoints a position by contact of the strip | belt-shaped resistive film formed on the board | substrate which opposes as shown in FIG. In the touch panel shown in FIG. 9, a strip-shaped Y coordinate detection resistance film 24 is simply formed on the surface of the rear substrate 2 facing the front substrate 1. A strip-shaped resistance film for X-coordinate detection 23 is formed on the surface facing the rear substrate 2 of the front substrate 1. For example, a voltage is sequentially applied to the X coordinate detection resistance film 23, the Y coordinate detection resistance film 24 whose potential is equal to the potential of the X coordinate detection resistance film 23, and the timing at which the potential becomes equal are obtained. Based on this, the position being touched can be determined. The present embodiment can also be applied to such a touch panel, and the same effect can be obtained.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. Here, differences from the first embodiment will be described, and description of the same parts will be omitted. The present embodiment is an embodiment in which the touch panel according to the first embodiment is built in a liquid crystal display device.
FIG. 10 shows an outline of the liquid crystal display device according to this embodiment. The present liquid crystal display device includes a liquid crystal display panel 100 having a touch panel function, a driver element 130, a common signal generation circuit 133, a display controller 134, a coordinate detection controller 10, and a main controller 135.

  The liquid crystal display panel 100 is an active matrix type liquid crystal display panel using thin film transistors (TFTs) as active elements. Here, the liquid crystal display device according to the present embodiment is a vertical QVGA (hereinafter referred to as QVGA portrait) display panel having 240 pixels in the horizontal direction and 320 pixels in the vertical direction. The liquid crystal display panel 100 includes a rear substrate 102 and a front substrate 101 that face each other with a liquid crystal layer interposed therebetween. Light emitted from a backlight (not shown) passes through the liquid crystal display panel 100 from the rear substrate 102 toward the front substrate 101 and reaches the user. In the description of this embodiment, the front substrate 101 side is defined as the observation side, and the rear substrate 102 side is defined as the backlight side.

  A plurality of transparent pixel electrodes 125 are formed in a region within the screen area 120 on the observation side surface of the rear substrate 102. For example, the pixel electrodes 125 are arranged in the X-axis direction and the Y-axis direction as shown in FIG. Each pixel electrode 125 has a rectangular shape in which the electrode width in the X-axis direction is smaller than the electrode length in the Y-axis direction. Each pixel electrode 125 is connected to a drain terminal of a display thin film transistor (display TFT) 126 that functions as a switching element. Each display TFT 126 is arranged at one corner (for example, the lower left corner in FIG. 11) of each rectangular pixel electrode 125.

  A scanning line 123 is formed in the X-axis direction along the pixel electrode 125 arranged in the X-axis direction on the observation side surface of the rear substrate 102. Each scanning line 123 is provided along the end of the pixel electrode 125 arranged in the X-axis direction on the side where the display TFT 126 is disposed (the lower end side of each pixel electrode 125 in FIG. 11). Are connected to the respective gate terminals of the display TFT 126 arranged along the line.

  Further, a signal line 124 is formed in the Y-axis direction along the pixel electrode 125 arranged in the Y-axis direction on the observation side surface of the rear substrate 102. Each signal line 124 is provided along the end of the pixel electrode 125 arranged in the Y-axis direction on the side where the display TFT 126 is disposed (the left end side of each pixel electrode 125 in FIG. 11). Are connected to the respective source terminals of the display TFT 126 arranged along the line.

  A driver element 130 is mounted on a driver mounting portion 102a formed by extending one end portion of the rear substrate 102 outward from the front substrate 101 as shown in FIG. As shown in FIG. 11, the driver element 130 is formed of an LSI (Large Scale Integrated Circuit) in which a scan driver 131 and a data driver 132 are formed. Each scanning line 123 is led to the driver mounting section 102a (not shown) and connected to each output terminal of the scanning driver 131, and each signal line 124 is similarly led to the driver mounting section 102a ( (Not shown) and connected to each output terminal of the data driver 132.

  On the backlight side of the front substrate 101, a single film-like transparent counter electrode 107 facing the plurality of pixel electrodes 125 is formed. The counter electrode 107 is connected to the common signal generation circuit 133, and the potential of the counter electrode 107 is controlled by the common signal generation circuit 133.

  The liquid crystal display panel 100 incorporates the touch panel according to the first embodiment. Here, the rear substrate 102 corresponds to the rear substrate 2, the front substrate 101 corresponds to the front substrate 1, and the counter electrode 107 corresponds to the counter electrode 7. On the observation side of the rear substrate 102, for example, as shown in FIG. 11, an X coordinate detection line 3 is arranged in the Y axis direction for every three pixel electrodes 125 arranged in the X axis direction. That is, one X coordinate detection line 3 is arranged for each pixel composed of three colors of red, green, and blue. A Y coordinate detection line 4 is arranged in the X axis direction for each pixel electrode 125 arranged in the Y axis direction.

As shown in FIG. 11, each X coordinate detection line 3 receives data from the pixel electrodes 125 arranged in the Y-axis direction and the display TFT 126 connected to each pixel electrode 125 in a column adjacent to the pixel electrode 125. a signal line 124 supplies a signal, during, are formed parallel to the signal line 124. Each Y coordinate detection line 4 is a scan that supplies a gate signal to each pixel electrode 125 arranged in the X-axis direction and to the display TFT 126 connected to each pixel electrode 125 in a row adjacent to the pixel electrode 125. the line 123, during, are formed parallel to the scanning line 123. An X coordinate detection contact electrode 5 is connected to the X coordinate detection line 3, and a Y coordinate detection contact electrode 6 is connected to the Y coordinate detection line 4.

  Further, gaps are provided between the X-coordinate detection contact electrode 5 and the counter electrode 107 and between the Y-coordinate detection contact electrode 6 and the counter electrode 107. When the user of the display device presses and bends the front substrate 101 from the observation side, the counter electrode 107 and the X-coordinate detection contact electrode 5 existing in that portion become conductive. As a result, the X-coordinate detection contact electrode 5 conducted with the counter electrode 107 and the X-coordinate detection line 3 connected to the contact electrode are equipotential with the counter electrode 107. Further, the counter electrode 107 is electrically connected to the Y coordinate detection contact electrode 6 existing in the portion. As a result, the Y coordinate detection contact electrode 6 conducted with the counter electrode 107 and the Y coordinate detection line 4 connected to the contact electrode have the same potential as the counter electrode 107.

Further, a plurality of thin film transistors for X coordinate detection (X coordinate detection) are provided on a region on the observation side of the rear substrate 102 and outside the screen area 120 (on the right side of the screen area 120 in FIG. 11). TFT) 108 and a plurality of Y coordinate detection thin film transistors (Y coordinate detection TFTs) 109 are formed. Each Y coordinate detection TFT109 is of the outside area of the screen area 120, the portion adjacent to the screen area 120 are arranged side by side in a row in the Y-axis direction. The intervals at which the Y coordinate detection TFTs 109 are arranged are approximately the same as the intervals between the Y coordinate detection lines 4.
On the other hand, each of the X coordinate detection TFTs 108 is arranged in a line adjacent to each of the Y coordinate detection TFTs 109 at a position further outward from the screen area 120 of each Y coordinate detection TFT 109. Yes.

  There are the same number of X coordinate detection TFTs 108 as the number of X coordinate detection lines 3. The source terminal of each X coordinate detection TFT 108 is connected to a separate X coordinate detection line 3. Here, the X coordinate detection line 3 and the X coordinate detection TFT 108 are connected by an extension line 115 routed outside the screen area 120. The gate terminal of each X coordinate detection TFT 108 is connected to a separate scanning line 123 via an extension line 110. The drain terminal of each X coordinate detection TFT 108 is connected to the X coordinate detection output line 111. The X coordinate detection output line 111 is connected to an external circuit connection terminal 113. The external circuit connection terminal 113 is provided in the driver mounting portion 102a (see FIG. 10).

  On the other hand, there are as many Y coordinate detection TFTs 109 as there are Y coordinate detection lines 4. The source terminal of each Y coordinate detection TFT 109 is connected to a separate Y coordinate detection line 4. The gate terminal of each Y coordinate detection TFT 109 is connected to a separate scanning line 123 via an extension line 110. The drain terminal of each Y coordinate detection TFT 109 is connected to the Y coordinate detection output line 112. The Y-coordinate detection output line 112 is connected to an external circuit connection terminal 114 provided in the driver mounting portion 102a, similarly to the X-coordinate detection output line 111.

The liquid crystal display panel 100 includes a twisted nematic (TN) type or a super twisted nematic (STN) type in which the liquid crystal molecules of the liquid crystal layer are twist-oriented between the rear substrate 102 and the front substrate 101. A vertical alignment type (Vertical Alignment method; VA method) or a lateral electric field type In-Plane Switching method (IPS method) liquid crystal panel in which liquid crystal molecules are aligned perpendicularly to the surfaces of the rear substrate 102 and the front substrate 101. A horizontal alignment type in which the molecular long axes of liquid crystal molecules are aligned in one direction and aligned in parallel with the rear substrate 102, a bend alignment type in which liquid crystal molecules are bend-aligned (Optically Compensated Birefringence method; OCB method), or ferroelectricity Or antiferroelectric The liquid crystal display panel or the like, may be any one of a variety of liquid crystal display panel. Further, a polymer network type liquid crystal display panel may be used.

  As shown in FIG. 10, the scanning driver 131 and the data driver 132 of the driver element 130 are connected to a display controller 134 of an external circuit connected to the liquid crystal display panel 100 described above. A common signal generation circuit 133 that applies a voltage to the counter electrode 107 is connected to the display controller 134. Further, the external circuit connection terminal 113 of the X coordinate detection output line 111 is connected to the coordinate detection controller 10 described above. Similarly, the external circuit connection terminal 114 of the Y coordinate detection output line 112 is connected to the coordinate detection controller 10. It is connected to the. The coordinate detection controller 10 is the same as the coordinate detection controller 10 according to the first embodiment. The display controller 134 and the coordinate detection controller 10 are connected to a main controller 135 that controls them.

  Thus, for example, the rear substrate 102 functions as a first substrate, the front substrate 101 functions as a second substrate, the pixel electrode 125 functions as a pixel electrode, and the counter electrode 107 functions as a counter electrode 107, for example. For example, the X-coordinate detection contact electrode 5 functions as a first contact electrode, and the Y-coordinate detection contact electrode 6 functions as a second contact electrode, for example, an X-coordinate detection line. 3 functions as a first detection line, for example, the Y coordinate detection line 4 functions as a second detection line, and for example, the coordinate detection controller 10 functions as a calculation unit.

  Next, the operation of the liquid crystal display device according to this embodiment will be described. In the liquid crystal display panel 100, the common signal (Vcom signal) output from the common signal generation circuit 133 is applied to the counter electrode 107. The scanning driver 131 of the display controller 134 sequentially selects each scanning line 123 and applies a gate signal for turning on the display TFT 126 to the selected scanning line 123 for a selection period. Further, the data driver 132 of the display controller 134 applies a data signal having a potential difference corresponding to the image data to the Vcom signal to each signal line 124 for a selection period of the scanning line 123. The liquid crystal display panel 100 is driven for display as described above. In the present embodiment, in the display driving method of the liquid crystal display panel 100, the voltage of the Vcom signal applied to the counter electrode 107 for each selection period of each scanning line 123 is set to a high level (hereinafter referred to as H level) and low level. A line inversion method for inversion to a level (hereinafter referred to as L level) is used.

  Next, the operation of the liquid crystal display panel 100 as a touch panel will be described. Here, FIG. 12 shows an outline of a circuit configuration in which the configuration related to the touch panel function is extracted from FIG. Each scanning line 123, each X coordinate detection TFT 108, each Y coordinate detection TFT 109, each X coordinate detection line 3, and each Y coordinate detection line 4 are given the following names. That is, from the upper end side in FIG. 12, the scanning line 123 connected to the gate terminal of the display TFT 126 connected to the pixel electrode 125 in the first row is the gate G1, the second row is the gate G2, and so on. The lower end of the 320th row is the gate G320. Then, the X coordinate detection TFT 108 whose gate terminal is connected to the gate G1 is referred to as X-TFT1, the X coordinate detection TFT 108 whose gate terminal is connected to the gate G2 is referred to as X-TFT2, and so on. The X-coordinate detection TFT 108 whose gate terminal is connected to the gate G240 is referred to as an X-TFT 240. Similarly, the Y coordinate detection TFT 109 whose gate terminal is connected to the gate G1 is Y-TFT1, the Y coordinate detection TFT 109 whose gate terminal is connected to the gate G2 is Y-TFT2, and so on. Then, the Y coordinate detection TFT 109 whose gate terminal is connected to the gate G320 is referred to as Y-TFT320.

  Further, the X coordinate detection line 3 connected to the source terminal of the X coordinate detection TFT 108 represented by X-TFT 1 is set to X1, and the X coordinate detection line 3 represented by X-TFT 2 is connected to the source terminal of the X coordinate detection TFT 108. The X coordinate detection line 3 connected to the source terminal of the X coordinate detection TFT 108 represented by the X-TFT 240 is hereinafter referred to as X240. Similarly, Y-coordinate detection line 4 connected to the source terminal of Y-coordinate detection TFT 109 represented by Y-TFT1 is Y1, and connected to the source terminal of Y-coordinate detection TFT 109 represented by Y-TFT2. The Y coordinate detection line 4 connected to the source terminal of the Y coordinate detection TFT 109 represented by the Y-TFT 320 is set to Y 320 in the same manner.

When the touch input is performed, a touched portion of the front substrate 101 (hereinafter referred to as a touch portion) is bent and deformed toward the rear substrate 102. Conducting a result, among the X coordinate detection electrode 5 formed on the rear substrate 102, the X coordinate detection electrode 5 formed on the touch portion, the counter electrode 107 formed on the front side substrate 101 To do. Similarly, Y coordinate detection electrode 6 of, formed in the touch part of the Y coordinate detection electrode 6 formed on the side substrate 102 after the touch unit is conducting with the counter electrode 107.

Therefore, the X coordinate detection electrode 5 was electrically connected to the counter electrode 107 with the touch portion, the potential of the the X coordinate detection line 3 that a contact electrode is connected, the potential applied to the paired counter electrodes 107 Vcom signal And the same level. Similarly, the Y coordinate detection electrode 6 electrically connected to the counter electrode 107 in the touch unit, and the Y coordinate detection line 4 that is connected to the contact electrode, the potential of the Vcom signal applied to the pair counter electrode 107 It becomes the same level as the potential.

As described above, each X coordinate detection line 3 is connected to the source terminal of the X coordinate detection TFT 108, and each Y coordinate detection line 4 is connected to the source terminal of the Y coordinate detection TFT 109. The gate terminal of each X coordinate detection TFT 108 is connected to a separate scanning line 123, and the gate terminal of each Y coordinate detection TFT 109 is connected to a separate scanning line 123.

  Therefore, when a gate signal is sequentially applied to the scanning lines 123 from the gate G1 to the gate G320 for image display, the X coordinate detection TFTs 108 from the X-TFT1 to the X-TFT240 are sequentially turned on. . At this time, the potential of the X coordinate detection output line 111 connected to the drain terminal of each X coordinate detection TFT 108 is the X coordinate connected to the source terminal of the X coordinate detection TFT 108 in the ON state. It becomes the potential of the detection line 3. Here, the potential of the X coordinate detection line 3 to which the X coordinate detection contact electrode 5 corresponding to the touch portion is connected is the potential of the counter electrode 107.

  Similarly, when gate signals are sequentially applied to the scanning lines 123 from the gate G1 to the gate G320, the Y coordinate detection TFTs 109 from the Y-TFT1 to the Y-TFT320 are sequentially turned on. The potential of the Y coordinate detection output line 112 connected to the drain terminal of each Y coordinate detection TFT 109 is detected by the Y coordinate detection connected to the source terminal of the Y coordinate detection TFT 109 in the ON state. It becomes the potential of the line 4. Here, the potential of the Y coordinate detection line 4 to which the Y coordinate detection contact electrode 6 corresponding to the touch portion is connected is the potential of the counter electrode 107.

  That is, when a gate voltage is applied in order of the gate G1, gate G2,..., Gate G240, the X-TFT1, X-TFT2,. Become. As a result, the potential of the output line 111 for X coordinate detection becomes sequentially the potential of the X coordinate detection line X1, the potential of the X coordinate detection line X2,..., And the potential of the X coordinate detection line X240. Similarly, when a gate voltage is applied in order of the gate G1, gate G2,..., Gate G320, the Y coordinate detection TFT 109 is turned on in the order of Y-TFT1, Y-TFT1,. It becomes. As a result, the potential of the Y-coordinate detection output line 112 sequentially becomes the potential of the Y-coordinate detection line Y1, the potential of the Y-coordinate detection line Y2,..., And the potential of the Y-coordinate detection line Y320. Therefore, the liquid crystal display panel 100 converts X-coordinate parallel data corresponding to the potential of each X-coordinate detection line 3 into X-coordinate serial data and outputs it from the X-coordinate detection output line 111. Similarly, the Y coordinate parallel data corresponding to the potential of each Y coordinate detection line 4 is converted into Y coordinate serial data and output from the Y coordinate detection output line 112.

  In the present embodiment, the coordinate detection controller 10 acquires the signal of the X coordinate detection output line 111 from the external circuit connection terminal 113, acquires the signal of the Y coordinate detection output line 112 from the external circuit connection terminal 114, and Based on the signal, the process of specifying coordinates in step S5 described with reference to FIG. 7A is performed. The other processes in the coordinate detection controller 10 are the same as those in the first embodiment.

  Even in this embodiment, as in the case of the first embodiment, it is detected whether the touched position is stationary or moving, and the method for determining the touch position is made different accordingly. Whether the touch position is stationary or moving, the accurate touch position can be specified.

The example described here is based on line inversion driving in which the Vcom signal is inverted, but it is needless to say that a dot inversion driving method or other driving method in which Vcom is not inverted may be used.
In the above description, the QVGA portrait has been described as an example. However, the QVGA portrait is not limited to the QVGA portrait. For example, the horizontal QVGA, for example, VGA (640 pixels × 480 pixels), SVGA (800 pixels × A display panel having various numbers of pixels such as 600 pixels), XGA (1024 pixels × 768 pixels), SXGA (1280 pixels × 1024 pixels), or a vertical type thereof may be used. When a display panel having another number of pixels is used, it goes without saying that the number of components described above increases or decreases in accordance with the number of pixels.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, the problem described in the column of problems to be solved by the invention can be solved and the effect of the invention can be obtained. The configuration in which this component is deleted can also be extracted as an invention. Furthermore, constituent elements over different embodiments may be appropriately combined.

  DESCRIPTION OF SYMBOLS 1 ... Front side board, 2 ... Rear side board, 3 ... X coordinate detection line, 4 ... Y coordinate detection line, 5 ... X coordinate detection contact electrode, 6 ... Y coordinate detection contact electrode, 7 ... Counter electrode, 10 ... Controller for coordinate detection, 23 ... Resistance film for X coordinate detection, 24 ... Resistance film for Y coordinate detection, 100 ... Liquid crystal display panel, 101 ... Front substrate, 102 ... Rear substrate, 102a ... Driver mounting portion, 107 ... Counter electrode 108 ... X coordinate detection thin film transistor, 109 ... Y coordinate detection thin film transistor, 110 ... extension line, 111 ... X coordinate detection output line, 112 ... Y coordinate detection output line, 113 ... external circuit connection terminal, 114 ... external Circuit connection terminal, 115 ... extension line, 120 ... screen area, 123 ... scanning line, 124 ... signal line, 125 ... pixel electrode, 126 ... thin film transistor for display, 126 ...示用 TFT, 130 ... driver device, 131 ... scan driver, 132 ... data driver, 133 ... common signal generator circuit, 134 ... display controller, 135 ... main controller.

Claims (3)

A substrate on the detection side;
When the substrate of the detection side is touched, a detector for detecting the touch on the substrate of the detection side,
Wherein the detection unit outputs, based on a detection signal representative of a plurality of coordinate values related to the touch on the substrate of the detection side, a calculation unit that specifies a data pitch position,
Comprising
The detection signal is
A plurality of first axis direction signals representing the plurality of coordinate values along a first axis relating to the touch on the substrate;
A plurality of second axis direction signals representing the plurality of coordinate values along a second axis intersecting the first axis related to the touch on the substrate;
Including
The maximum value along the first axis of the plurality of coordinate values is Xmax1, the minimum value along the first axis is Xmin1, the maximum value along the second axis is Ymax1, and the second axis If the minimum value along Y is Ymin1,
The computing unit is
When it is determined based on the first axis direction signal that the plurality of coordinate values along the first axis are temporally changed in the increasing direction, the first position of the touched position is determined. A coordinate value Xtouch along the axis is calculated based on the following equation (1),
Xtouch = (Xmax1-Xmin1) / XgainP + Xmin1 (1)
Here, 1 ≦ XgainP <2, XgainP indicates that the coordinate value Xtouch along the first axis at the touched position is from the median value of the plurality of coordinate values along the first axis. A value representing whether to be biased in the direction of increasing along the first axis,
When it is determined that the plurality of coordinate values along the first axis are temporally changing based on the first axis direction signal, the first position of the touched position is determined. A coordinate value Xtouch along the axis is calculated based on the following equation (2),
Xtouch = (Xmax1-Xmin1) / XgainM + Xmin1 (2)
Here, 2 <XgainM and XgainM indicate how much the coordinate value Xtouch along the first axis of the touched position from the median value of the plurality of coordinate values along the first axis. It is a value that represents whether to deviate along the axis of 1 in the direction of decreasing,
When it is determined based on the second axis direction signal that the plurality of coordinate values along the second axis are temporally changing in a direction in which the coordinate values increase, the second position of the touched position is determined. A coordinate value Ytouch along the axis is calculated based on the following equation (3):
Ytouch = (Ymax1-Ymin1) / YgainP + Ymin1 (3)
Here, 1 ≦ YgainP <2, YgainP indicates how much the coordinate value Ytouch along the second axis of the touched position is from the median value of the plurality of coordinate values along the second axis. A value representing whether to be biased in the direction of increasing along the second axis,
Based on the second axis direction signal, when it is determined that the plurality of coordinate values along the second axis are temporally changing in a decreasing direction, the second position of the touched position is determined. A coordinate value Ytouch along the axis is calculated based on the following equation (4),
Ytouch = (Ymax1-Ymin1) / YgainM + Ymin1 (4)
Here, 2 <YgainM and YgainM indicate how much the coordinate value Ytouch along the second axis of the touched position from the median value of the plurality of coordinate values along the second axis. It is a value that represents whether to bias in a direction that decreases along the axis of 2.
A touch panel characterized by that. An active matrix liquid crystal display element having a pixel electrode formed on a first substrate and a counter electrode formed on a second substrate facing each other across a liquid crystal layer,
A plurality of detection lines formed on the first substrate;
Faces having said counter electrode and the gap, before Symbol second substrate are conductive and the counter electrode when it is touched, a plurality of contact electrodes which are connected to one of said plurality of detection lines,
Represented by each potential of the detection line, based on a plurality of coordinate values relating to the touch to the second substrate, and a calculating unit for identifying the position at which the data pitch,
Comprising
The detection line is
A plurality of first detection lines for transmitting signals representing the plurality of coordinate values along a first axis;
A plurality of second detection lines that transmit signals representing the plurality of coordinate values along a second axis and that are arranged in a twisted position with respect to each first detection line;
Including
The contact electrode is
A plurality of first contact electrodes connected to any of the plurality of first detection lines;
A plurality of second contact electrodes connected to any of the plurality of second detection lines;
Including
The maximum value along the first axis of the plurality of coordinate values is Xmax1, the minimum value along the first axis is Xmin1, the maximum value along the second axis is Ymax1, and the second axis If the minimum value along Y is Ymin1,
The computing unit is
When it is determined that the plurality of coordinate values along the first axis are temporally changing based on the potential of the first detection line, the first position of the touched position is determined. A coordinate value Xtouch along the axis of 1 is calculated based on the following equation (1):
Xtouch = (Xmax1-Xmin1) / XgainP + Xmin1 (1)
Here, 1 ≦ XgainP <2, XgainP indicates that the coordinate value Xtouch along the first axis at the touched position is from the median value of the plurality of coordinate values along the first axis. A value representing whether to be biased in the direction of increasing along the first axis,
When it is determined that the plurality of coordinate values along the first axis are temporally changed based on the potential of the first detection line, the first position of the touched position is determined. A coordinate value Xtouch along the axis of 1 is calculated based on the following equation (2):
Xtouch = (Xmax1-Xmin1) / XgainM + Xmin1 (2)
Here, 2 <XgainM and XgainM indicate how much the coordinate value Xtouch along the first axis of the touched position from the median value of the plurality of coordinate values along the first axis. It is a value that represents whether to deviate along the axis of 1 in the direction of decreasing,
When it is determined that the plurality of coordinate values along the second axis are temporally changed based on the potential of the second detection line, the first position of the touched position is determined. A coordinate value Ytouch along the axis of 2 is calculated based on the following equation (3):
Ytouch = (Ymax1-Ymin1) / YgainP + Ymin1 (3)
Here, 1 ≦ YgainP <2, YgainP indicates how much the coordinate value Ytouch along the second axis of the touched position is from the median value of the plurality of coordinate values along the second axis. A value representing whether to be biased in the direction of increasing along the second axis,
Based on the potential of the second detection line, when it is determined that the plurality of coordinate values along the second axis are temporally changing in a decreasing direction, the first position of the touched position is determined. The coordinate value Ytouch along the axis of 2 is calculated based on the following equation (4):
Ytouch = (Ymax1-Ymin1) / YgainM + Ymin1 (4)
Here, 2 <YgainM and YgainM indicate how much the coordinate value Ytouch along the second axis of the touched position from the median value of the plurality of coordinate values along the second axis. It is a value that represents whether to bias in a direction that decreases along the axis of 2.
A liquid crystal display element having a touch panel. Detects the touch sensing side of the substrate when it is touched, based on the plurality of coordinate values related to the touch on the substrate of the detected the detected side, the position of the touch panel to identify the data pitch position In the detection method,
The maximum value along the first axis of the plurality of coordinate values is Xmax1, the minimum value along the first axis is Xmin1, and the maximum value along the second axis that intersects the first axis is Ymax1. If the minimum value along the second axis is Ymin1,
When the plurality of coordinate values along the first axis change in a direction that increases in time, a coordinate value Xtouch along the first axis at the touched position is expressed by the following equation (1). ) Based on
Xtouch = (Xmax1-Xmin1) / XgainP + Xmin1 (1)
Here, 1 ≦ XgainP <2, XgainP indicates that the coordinate value Xtouch along the first axis at the touched position is from the median value of the plurality of coordinate values along the first axis. A value representing whether to be biased in the direction of increasing along the first axis,
When the plurality of coordinate values along the first axis change in a direction that decreases in time, a coordinate value Xtouch along the first axis at the touched position is expressed by the following equation (2). ) Based on
Xtouch = (Xmax1-Xmin1) / XgainM + Xmin1 (2)
Here, 2 <XgainM and XgainM indicate how much the coordinate value Xtouch along the first axis of the touched position from the median value of the plurality of coordinate values along the first axis. It is a value that represents whether to deviate along the axis of 1 in the direction of decreasing,
When the plurality of coordinate values along the second axis change in a direction that increases in time, a coordinate value Ytouch along the second axis at the touched position is expressed by the following equation (3). ) Based on
Ytouch = (Ymax1-Ymin1) / YgainP + Ymin1 (3)
Here, 1 ≦ YgainP <2, YgainP indicates how much the coordinate value Ytouch along the second axis of the touched position is from the median value of the plurality of coordinate values along the second axis. A value representing whether to be biased in the direction of increasing along the second axis,
When the plurality of coordinate values along the second axis change in a direction that decreases in time, a coordinate value Ytouch along the second axis at the touched position is expressed by the following equation (4). ) Based on
Ytouch = (Ymax1-Ymin1) / YgainM + Ymin1 (4)
Here, 2 <YgainM and YgainM indicate how much the coordinate value Ytouch along the second axis of the touched position from the median value of the plurality of coordinate values along the second axis. It is a value that represents whether to bias in a direction that decreases along the axis of 2.
A touch panel position detection method.

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