JP2013025626A - Touch panel and display device including the same - Google Patents

Touch panel and display device including the same Download PDF

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Publication number
JP2013025626A
JP2013025626A JP2011160994A JP2011160994A JP2013025626A JP 2013025626 A JP2013025626 A JP 2013025626A JP 2011160994 A JP2011160994 A JP 2011160994A JP 2011160994 A JP2011160994 A JP 2011160994A JP 2013025626 A JP2013025626 A JP 2013025626A
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Japan
Prior art keywords
detection
touch
touch screen
wiring
capacitance
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JP2011160994A
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Japanese (ja)
Inventor
Masafumi Agari
将史 上里
Naoki Nakagawa
直紀 中川
Seiichiro Mori
成一郎 森
Takashi Miyayama
隆 宮山
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Mitsubishi Electric Corp
三菱電機株式会社
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Priority to JP2011160994A priority Critical patent/JP2013025626A/en
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Abstract

PROBLEM TO BE SOLVED: To provide a touch panel with a touch screen in a convex or concave state, for suppressing a deviation of touch coordinates due to a touch position and highly accurately calculating the touch coordinates independent of the touch position.SOLUTION: The touch panel comprises: a touch screen 1 which includes row wiring 2 for detection disposed in a lateral direction and column wiring 3 for detection disposed in a longitudinal direction, and has a cross section in the longitudinal direction in a convex state or a concave state; a switch circuit 20 for successively selecting the wiring for detection; a capacitance detection circuit 21 for detecting capacitance of the wiring for detection selected by the switch circuit; and a touch coordinate calculation circuit 22 for calculating coordinates on the basis of a detection result. A width of the wiring 2 for detection is formed so as to be successively narrower from an upper end to a lower end in the longitudinal direction of the touch screen 1 when the touch screen 1 is in the convex state and to be successively wider from the upper end to the lower end in the longitudinal direction of the touch screen 1 when the touch screen 1 is in the concave state.

Description

The present invention relates to a touch panel and a display device including the touch panel, and particularly to a capacitive touch panel having a curved touch screen and a display device including the touch panel.

A touch panel is an input device that touches a touch screen with an indicator such as a finger to specify coordinates thereof, and methods such as a resistance film method and a capacitance method are commercialized by a position detection method.

  The touch screen constituting the touch panel is generally flat, but a resistive film type touch panel having a curved shape is also known from the viewpoint of design, usage, and the like (for example, Patent Document 1).

  On the other hand, there is a projected capacitive touch panel as one of capacitive touch panels (for example, Patent Document 2). This type of touch panel detects capacitance when a matrix-like detection wiring arranged on the touch screen is touched with a finger, etc., and identifies touch coordinates on the touch screen. Wear gloves or the like. However, it can be detected, and since a protective layer can be disposed on the surface, it has features such as excellent robustness, and is therefore widely used.

JP 2008-47026 A (page 8, lines 10-18, FIG. 1) JP-T 9-51186 (page 7, line 19 to page 8, line 4, FIGS. 1 and 2)

  When this projected capacitive touch panel is used as a curved surface, the touch screen is curved even if the top, bottom, right, and left of the touch screen are touched from the front of the touch screen. And the relative angle of the indicator is different. For example, when the vertical cross section has a convex shape, the indicator touches a larger area as it touches the upper part of the touch screen, and conversely, the lower part touches only a narrow area. The contact area of the indicator differs depending on the touch position. .

  When calculating touch coordinates on a touch screen with a projected capacitive touch panel, the capacitance of multiple adjacent detection wirings at the time of touch is detected and interpolated to obtain accurate touch coordinates. Yes. However, when the touch screen has a curved surface shape as described above, the contact area differs depending on the touch position, and therefore the number of detection wirings that generate capacitance at the time of touch also differs. There was a problem that the accuracy was different depending on the position on the touch screen.

  The present invention has been made to solve such a problem, and even when the touch contact area is different between the top, bottom, left and right of the touch screen, the accuracy of the touch coordinates does not vary within the touch screen surface, and the entire surface. The purpose is to obtain touch coordinates with high accuracy.

The touch panel of the present invention has a plurality of detection row wirings arranged in the horizontal direction and a plurality of detection column wirings arranged in the vertical direction, and the vertical cross section has a convex shape or a concave shape. A touch screen on which a touch operation is performed by an indicator, a switch circuit that sequentially selects a plurality of detection row wirings and detection column wirings, and a detection row wiring and a detection column wiring selected by the switch circuit. A capacitance detection circuit for detecting capacitance, and a touch coordinate calculation circuit for calculating touch coordinates on the touch screen touched by the indicator based on the detection result of the capacitance detection circuit, the detection row wiring When the vertical cross section of the touch screen has a convex shape, the width of the touch screen is gradually narrowed from the upper end to the lower end of the touch screen, and the vertical cross section of the touch screen is concave. Case, which are sequentially widely formed from the upper end to the lower end of the touch screen in the vertical direction.

  In the touch panel of the present invention, when the width of the row wiring for detection at the contact portion between the touch screen and the indicator is convex in the vertical cross section of the touch screen, it extends from the upper end to the lower end in the vertical direction of the touch screen. When the touch screen is narrow and the vertical cross-section of the touch screen is concave, the touch screen is formed so as to gradually widen from the upper end to the lower end in the vertical direction. The touch coordinates can be obtained with high accuracy over the entire surface without the accuracy of the touch coordinates being different within the touch screen surface.

It is a top view which shows the structure of the touch screen in the touchscreen of Embodiment 1 of this invention. It is a figure which shows the one part laminated structure of the touch screen shown in FIG. 1, (a) is a perspective sectional view, (b) is sectional drawing of the curved-surface-shaped touch screen. It is a figure which shows the structure of the row wiring for a touch screen in the touchscreen of Embodiment 1 of this invention, and the relationship between the indicator at the time of a touch, and a touch screen, When the (a) is convex shape, the (b ) Is a diagram showing a concave shape. It is a schematic diagram which shows the whole structure of the touchscreen of Embodiment 1 of this invention. It is a block diagram which shows the structure of the touch screen and detection processing circuit in the touchscreen of Embodiment 1 of this invention. It is a block diagram which shows the structure of the switch circuit in the touchscreen of Embodiment 1 of this invention. It is a processing flow figure in Embodiment 1 of the present invention. It is a figure which shows the example of the correction value in Embodiment 1 of this invention. It is a figure which shows the structure of the row wiring for a touch screen in the touchscreen of Embodiment 2 of this invention, and the relationship between the indicator at the time of a touch, and a touch screen, When the (a) is convex shape, the (b ) Is a diagram showing a concave shape. It is a figure which shows the structure of the touch screen in the touchscreen of Embodiment 3 of this invention, The figure (a) is a figure which shows a convex shape, The figure (b) is a figure which shows a concave shape. It is sectional drawing which shows the structure of the liquid crystal display device which is Embodiment 4 of this invention, (a) is a figure which shows the case where convex shape and the (b) are concave shape.

Embodiment 1 FIG.
FIG. 1 is a plan view showing a configuration of a touch screen in the touch panel according to Embodiment 1 of the present invention. The touch panel according to the first embodiment is a so-called projected capacitive touch panel. The touch screen 1 includes a plurality of detection row wires 2 arranged in the horizontal direction and a plurality of detection line wires arranged in the vertical direction. The detection column wiring 3 is provided. The detection row wiring 2 is composed of a thin line-like electrode 4 and a slit-like gap 6 having no electrode, and the detection column wiring 3 is constituted of a thin-line electrode 5 and a slit-like gap 7 having no electrode. Is done.

  In the touch screen 1, the direction in which the horizontal detection row wiring 2 extends is defined as “x direction”, and the direction in which the vertical detection column wiring 3 extends is defined as “y direction”. The horizontal detection row wiring 2 and the vertical detection column wiring 3 are orthogonal to each other, and the x direction and the y direction are also orthogonal to each other.

  Each detection row wiring 2 and detection column wiring 3 are connected to a terminal 10 by lead-out wirings 8 and 9. When the indicator touches the touch screen 1, electrostatic capacitance is generated by the touch between the horizontal detection row wiring 2 and the vertical detection column wiring 3 and the indicator.

  The widths of the thin wire electrodes 4 and 5 constituting the detection row wiring 2 and the detection column wiring 3, the slit-like gaps 6 and 7, and the number of repetitions thereof are shown in FIG. The entire surface of the touch screen 1 is described uniformly, and the curved surface state of the touch screen 1 is also simply described as a flat surface.

  As the material for the detection row wiring 2 and the detection column wiring 3, aluminum (Al) can be used, and metal wiring materials such as copper (Cu) and silver (Ag), indium tin oxide (Indium Tin Oxide) A light-transmitting conductive material (hereinafter, referred to as “light-transmitting conductive material”) such as abbreviation: ITO) can also be used. When the visibility of the detection row wiring 2 and the detection column wiring 3 becomes a problem on display, it is preferable to use a translucent conductive material such as ITO. By using a light-transmitting conductive material such as ITO, the visibility of the detection row wirings 2 and the detection column wirings 3 can be lowered, so that a decrease in the transmittance of display light can be suppressed.

  The width of the thin wire electrodes 4 and 5 of the detection row wiring 2 and the detection column wiring 3, the width of the slit-shaped gaps 6 and 7, and the number of repetitions thereof are the type of wiring material and the curvature of the curved shape of the touch screen. The curved surface changes depending on whether it is a convex shape or a concave shape, and can be determined as appropriate from constraints such as the detection sensitivity of the capacitance by touch, the area touched by the indicator, the aperture ratio of the touch panel, and the like.

  FIG. 2A is a perspective sectional view showing a part of the laminated structure of the touch screen 1 shown in FIG. FIG. 2A corresponds to a perspective view of the touch screen 1 shown in FIG. 1 as viewed obliquely from the front side of FIG. 1 and shows a layer structure in the thickness direction of the touch screen 1. FIG. 2A shows a planar state before the touch screen is bent to be curved (before being bent).

  The touch screen 1 includes a translucent transparent substrate (hereinafter referred to as “base substrate”) 12, an interlayer insulating film 13, and a protective film 14. The base substrate 12 is a layer constituting the surface of the touch screen 1, has translucency and insulation, and is made of an insulating material having translucency such as transparent glass and transparent resin.

  On the lower surface of the base substrate 12, the plurality of detection row wirings 2 described above are formed. In the drawing, the thin line electrode 4 and the slit-like gap 6 of the detection row wiring 2 are not shown for simplification. However, as shown in FIG. 4 and slit-like gap 6 are repeated.

  A transparent interlayer insulating film 13 is formed on the lower surface of the base substrate 12 so as to cover the detection row wiring 2. The interlayer insulating film 13 has a light-transmitting property and an insulating property, and is made of a light-transmitting insulating material such as silicon nitride (SiN). On the surface on the other side in the thickness direction of the interlayer insulating film 13, the above-described plurality of detection column wirings 3 are formed. Although the thin line-like electrode 5 and the slit-like gap 7 of the detection column wiring 3 are not shown in the figure, as shown in FIG. 1, the detection column wiring 3 has the thin-line electrode 5 and the slit-like gap. The gap 7 is repeated.

  Although different from the present embodiment, the arrangement positions of the detection row wirings 2 and the detection column wirings 3 on the lower surface of the base substrate 12 can be reversed, and the detection columns are arranged on the lower surface of the base substrate 12. The wiring 3 may be formed, and the detection row wiring 2 may be formed on the surface of the interlayer insulating film 13.

  A transparent protective film 14 is formed so as to cover the lower surface side of the interlayer insulating film 13 and the detection row wiring 3. The protective film 14 has a light-transmitting property and an insulating property, and is made of a light-transmitting insulating material such as SiN, like the interlayer insulating film 13.

  FIG. 2B shows a cross-sectional structure when the touch screen 1 in the flat state shown in FIG. 2A is curved to obtain a curved touch screen 1. In particular, when the base substrate 12 is a glass substrate, the detection row wiring 2, the detection column wiring 3 and the interlayer insulating film 13 are formed and patterned to form the flat touch screen 1, and then the glass substrate is used. Processing may be performed so that it can be easily bent by making it thinner by etching.

  FIG. 3 is a diagram showing a configuration of the touch screen detection row wiring in the touch panel according to the first embodiment of the present invention, and a relationship between the indicator and the touch screen at the time of touch. FIG. In the case of the shape, FIG. 3B shows the case of the concave shape. 3A and 3B, the touch screen 1 and the indicator when the upper end, the center and the lower end in the vertical direction of the touch screen 1 are touched with the finger as the indicator 15 in the right half of FIGS. 15 shows an image diagram of an angle formed by 15 and a contact area of a touched portion. The relative angles formed by the touch screen 1 and the indicator 15 are α (upper end), β (central portion), and γ (lower end) from the top. It is said.

  When the longitudinal section of the touch screen 1 has a convex shape (FIG. 3A), the relative angle between the indicator 15 and the touch screen 1 becomes larger as α <β <γ and the lower end portion in the longitudinal direction. The contact area is large at the upper end and smaller at the lower end. For this reason, even if the width (Py) of the detection row wiring 2 is wide at the upper end portion, the contact area is large, so that the plurality of detection row wirings 2 can be easily touched by the indicator 15, The touch coordinates can be calculated with high accuracy by interpolating the capacitance of the row wiring 2.

  If the width (Py) of the detection row wiring 2 is formed wide similarly to the upper end portion at the lower end portion in the vertical direction of the touch screen 1, the contact area of the indicator 15 is small. The wiring 2 cannot be touched, and the touch coordinates cannot be obtained with high accuracy by interpolation of capacitances of a plurality of wirings. A so-called dead zone for position determination occurs.

  Therefore, by reducing the width (Py) of the horizontal detection row wiring 2 at the lower end, it is possible to easily touch the plurality of detection row wirings 2 even when the contact area by the indicator 15 is small. Touch coordinates can be calculated with high accuracy by interpolating these capacitances.

  A method of changing the width (Py) of the detection row wiring 2 in the horizontal direction will be specifically described. As shown in FIG. 1, the detection row wiring 2 is composed of a thin wire electrode 4 and a slit-like gap 6. When changing the width (Py) of the detection row wiring 2, the width of the thin line-like electrode 4 and the size of the slit-like gap 6 are the same in the plane of the touch screen 1. The number of repetitions of the gap 6 is changed.

  That is, when the vertical cross section shown in FIG. 3A has a convex shape, the width of the detection row wiring 2 is formed so as to be narrowed sequentially from the upper end portion to the lower end portion in the vertical direction of the touch screen 1. The number of repetitions of the thin line-like electrode 4 and the slit-like gap 6 constituting the wiring 2 is sequentially reduced from the upper end to the lower end in the vertical direction of the touch screen 1.

  FIG. 3B shows a touch screen 1 having a concave cross section in the vertical direction. Contrary to FIG. 3A, the relative angle between the touch screen 1 and the indicator 15 is α> β> γ. The lower end of the direction becomes smaller. Therefore, the contact area between the indicator 15 and the touch screen 1 gradually increases from the upper end to the lower end. Therefore, the width (Py) of the detection row wiring 2 is narrow at the upper end and wide at the lower end at the lower end. Specifically, the number of repetitions of the thin wire electrode 4 and the slit-like gap 6 constituting the detection row wiring 2 is small at the upper end portion in the vertical direction of the touch screen 1 and larger at the lower end portion.

  As a result, the width (Py) of the detection row wiring 2 is wide at the lower end portion in the vertical direction of the touch screen 1, but the contact area by the indicator 15 is also large. 2 can be touched, and the touch coordinates can be calculated with high accuracy by interpolating their capacitances.

  Further, since the width (Py) of the detection row wiring 2 is narrow and the contact area by the indicator 15 is small at the upper end portion in the vertical direction of the touch screen 1, a plurality of detection row wirings 2 can be easily touched. The touch coordinates can be calculated with high accuracy by interpolating those capacitances.

  FIG. 4 is a schematic diagram showing the overall configuration of the touch panel according to Embodiment 1 of the present invention. The touch panel 100 includes the touch screen 1 shown in FIGS. 1 and 2, a flexible printed circuit (abbreviated as FPC) 17, and a controller substrate 18.

  A terminal provided at one end of the FPC 17 is mounted on the terminal 10 shown in FIG. 1 of the touch screen 1 by an anisotropic conductive film (abbreviation: ACF) or the like. The terminal on the opposite side of the FPC 17 is mounted on the controller board 18. Through the FPC 17, the end portions of the detection row wiring 2 and the detection column wiring 3 of the touch screen 1 are electrically connected to the controller substrate 18.

  On the controller board 18, a detection processing circuit 19 that performs a calculation process of the touch coordinates of the indicator 15 on the touch screen 1 is mounted based on the detection result of the capacitance of the detection row wiring by touch. The touch coordinates calculated by the detection processing circuit 19 are output to an external computer (not shown).

  FIG. 5 is a block diagram of the touch screen 1 and the detection processing circuit 19 in the touch panel according to the first embodiment of the present invention. As shown in FIG. 5, the detection processing circuit 19 includes a switch circuit 20, a capacitance detection circuit 21, a touch coordinate calculation circuit 22, a buffer circuit 24, a switch circuit 20, a capacitance detection circuit 21, and a touch coordinate calculation circuit. A detection control circuit 23 is provided for controlling each of 22. The capacitance detection circuit 21 detects the capacitance generated on the touch screen 1, and the input end of the buffer circuit 24 is connected to the detection end of the capacitance detection circuit 21. Here, for example, when the relaxation oscillator that detects the change in the oscillation period based on the RC time constant is used as the capacitance detection circuit 21, the connection point between the resistance element and the capacitance element becomes the detection end. Further, when the time for charging the constant current to the capacitive element is set as the oscillation period, the connection point between the constant current source and the capacitive element is the detection end.

  The end of each detection row wiring 2 (Wc (0),..., Wc (m−1) in the figure, the row number increases from the top to the bottom of the touch screen) is connected to the lead wiring 8 (Lc (0 ),..., Lc (m-1)) and the terminal 10 are connected to the switch circuit 20, and each detection column wiring 3 (Wr (0),..., Wr (n-1), touch The end of the screen whose column number increases from right to left is connected to the switch circuit 20 via the lead wiring 9 (Lr (0),..., Lr (n−1)) and the terminal 10. .

  FIG. 6 is a block diagram showing the configuration of the switch circuit 20 in the touch panel according to Embodiment 1 of the present invention. As shown in FIG. 6, the switch circuit 20 includes an analog multiplexer circuit 27 that switches the connection to 2: 1 for each of the detection row wiring 2 and the detection column wiring 3. The connection of the detection row wiring 2 and the detection column wiring 3 is switched to the detection end of the capacitance detection circuit 21 or the output end of the buffer circuit 24 by the analog multiplexer circuit 27 of the switch circuit 20 corresponding to each.

  The analog multiplexer circuit 27 constituting the switch circuit 20 selects the detection wiring to be connected according to the instruction to the control signal output from the detection control circuit 23, and one wiring from the detection row wiring 2 and the detection column wiring 3 one by one. The connection with the capacitance detection circuit 21 is sequentially switched. Therefore, one detection wiring selected to be connected to the capacitance detection circuit 21 becomes a detection target as a selection wiring, and the other non-selection wirings are connected to the output (predetermined potential) of the buffer circuit 24. The electrostatic capacitance detection result corresponding to the detection row wiring 2 and the detection column wiring 3 output from the electrostatic capacitance detection circuit 21 is input to the touch coordinate calculation circuit 22, and the electrostatic capacitance is detected by the touch coordinate calculation circuit 22. Based on the detection result, the touch coordinates of the indicator 15 are calculated. The touch coordinates are calculated by detecting the detection row wiring 2 and the detection column wiring 3 adjacent to each other when the detection row wiring 2 and the detection column wiring 3 have detection values exceeding a predetermined threshold. Are used together to perform an interpolation operation in each of the horizontal direction and the vertical direction to obtain touch coordinates.

  The buffer circuit 24 buffers the potential (predetermined potential) appearing at the detection end of the capacitance detection circuit 21 and applies it to the non-selected wiring group not selected by the switch circuit 20. Thereby, the selection wiring and the non-selection wiring by the switch circuit 20 can be set to substantially the same potential, and the influence of the coupling capacitance formed between both wirings and between the drawing wirings connected to each wiring can be reduced. It becomes possible.

  FIG. 7 is a processing flow diagram according to Embodiment 1 of the present invention. The touch coordinate calculation of the touch panel of the first embodiment is performed according to Step 1 to Step 8 shown in FIG. Hereinafter, the process of calculating the touch coordinates in the first embodiment will be described with reference to FIG.

Step1
The switch circuit 20 is switched, the capacitance detection circuit 21 and the detection row wiring 2 (Wc (0),..., Wc (m−1)), the detection column wiring 3 (Wr (0),. , Wr (n−1)) are sequentially connected. Capacitances dy (j) and dx (i) are detected by the capacitance detection circuit 21, and are repeatedly stored over all the detection wirings. Here, dy (j) and dx (i) are the capacitances of the detection row wiring 2 and the detection column wiring 3, respectively, j is the row number (0 ≦ j ≦ m−1), and i is the column number (( 0 ≦ i ≦ n−1) respectively.

Step2
After detecting and storing the capacitance of all the detection row wirings 2 and the detection column wirings 3, the baseline correction of the measured values is performed. In the portion not touched by the indicator 15, there is no capacitance in principle, but it is not always “due to the intersection of the detection row wiring 2 and the detection column wiring 3, the influence of the parasitic capacitance between the lead wires 8 and 9” It is not “0”, and the calculation accuracy of coordinates in the subsequent steps is lowered. Therefore, the base line correction is performed on the series of electrostatic capacitances dy (j) and dx (i) of the detection row wiring 2 and the detection column wiring 3, and the electrostatic capacitances Dy (j) and Dx ( i).

Step3
As described above, when the longitudinal section of the touch screen 1 is convex or concave, the contact area between the touch screen 1 and the indicator 15 such as a finger is touched as schematically shown in FIG. The position changes depending on the vertical position on the touch screen. For this reason, the capacitance of the plurality of detection row wirings 2 is generated at any touch position, and these are interpolated to detect the touch coordinates with high accuracy. The width of the row wiring 2 is changed.

  Specifically, when the vertical cross section is convex, the width of the detection row wiring 2 is formed so as to narrow sequentially from the upper end to the lower end in the vertical direction, and when the vertical cross section is concave, the vertical direction Are formed so as to gradually increase from the upper end portion to the lower end portion, thereby eliminating the change in accuracy of calculation of touch coordinates due to the difference in touch position.

  However, the contact area by the indicator 15 is different between the upper end portion and the lower end portion on the touch screen 1 and the absolute values of the capacitances of the detection row wiring 2 and the detection column wiring 3 change. It cannot be determined by a single threshold value of capacitance, and it is difficult to calculate touch coordinates with high accuracy. In order to eliminate the influence of the difference in the contact area depending on the touch position on the surface of the touch screen 1, the measured capacitance is corrected.

  As described above, the contact area of the indicator 15 on the touch screen 1 is larger at the upper end when the vertical cross-section is convex as shown in FIG. The lower end becomes larger. Due to this influence, the absolute value of the capacitance also changes depending on the touch position. Therefore, in order to eliminate the influence of the contact area, the correction value ky (j) (j having a complementary relationship with the width of the detection row wiring 2 determined based on the contact area between the touch screen 1 and the indicator 15 is used. Is obtained in advance for each detection row wiring 2 and stored in the touch coordinate calculation circuit 22, and the correction value ky (j) is obtained in Step 2 to perform the baseline correction. Further, correction is performed by multiplying the electrostatic capacity Dy (j).

  By this step, the change in the absolute value of the capacitance of each detection row wiring 2 due to the difference in the contact area between the touch screen 1 and the indicator 15 is corrected to obtain a corrected capacitance Dyc (j).

Step4
The corrected electrostatic capacitance Dyc (j) is compared with a predetermined threshold value (Thy) to determine whether or not there is a touch. If the maximum corrected capacitance Dyc (j0) does not exceed the predetermined threshold value (Thy), it is determined that the touch is not made and the process proceeds to Step 1 again. On the other hand, if the maximum corrected capacitance Dyc (j0) exceeds a predetermined threshold value (Thy), the process proceeds to Step 5 assuming that the touch is made (j0 indicates the maximum corrected capacitance). Indicates the row number of the detection row wiring 2).

  The correction capacitance Dyc (j) has a complementary relationship with the width of the detection row wiring 2, and the correction value ky (j) obtained in advance for each detection row wiring 2 is subjected to baseline correction. Since there is no difference in the absolute value of the capacitance due to the difference in the contact area between the touch screen 1 and the indicator 15, the presence / absence of touch with a single threshold value is obtained. Can be judged.

Step5
The electrostatic capacitance Dx (i) (0 ≦ i ≦ n−1) corrected for the base line of each detection column wiring 3 in the vertical direction is set to be static without affecting the contact area between the touch screen 1 and the indicator 15 due to the touch position. Correct the capacitance.

  In the touch screen 1 having a convex or concave cross section in the vertical direction, even if the touch position changes in the horizontal direction (x direction), there is almost no change in the contact area of the indicator 15 in the horizontal direction (x direction). It is not necessary to correct the influence of the contact area for each of the detection column wirings 3 arranged side by side. However, even if the touch position of the indicator 15 changes in the vertical direction (y direction) among the same detection column wiring 3, the contact area with the indicator 15 is different. It is necessary to multiply by ky (j0) used for correcting the row wiring 2. Therefore, the base line-corrected electrostatic capacitance Dx (i) of each detection column wiring 3 has a ky (j0) value corresponding to the position in the vertical direction (y direction) of the touch position, that is, the maximum corrected electrostatic capacity as described above. The corrected capacitance Dxc (i) without the influence of the contact area is obtained by multiplying the capacitance Dyc (j0) by the same ky (j0) value used.

Step6
The maximum corrected capacitance Dxc (i0) of the corrected capacitance Dxc (i) is obtained, compared with a predetermined threshold value (Thx), and the column number of the detection column wiring 3 serving as the center of the touch position is determined. Identify. The maximum corrected capacitance Dxc (i0) is compared with a predetermined threshold value (Thx). If the threshold value is not exceeded, it is determined that there is no touch, and the process returns to Step 1 again to Capacitance detection is performed. When the threshold value is exceeded, the maximum corrected capacitances (Dyc (j0), Dxc (i0)) of the detection direction wiring 2 and the detection column wiring 3 in the horizontal direction and the vertical direction obtained so far, respectively. Is used to proceed to the coordinate calculation process of Step 7 (i0 indicates the column number of the detection column wiring 3 indicating the maximum corrected capacitance).

  The correction capacitance Dxc (i) is corrected by multiplying ky (j0) corresponding to the position of the touch position in the vertical direction (y direction), and therefore the contact area between the touch screen 1 and the indicator 15 by the touch position is corrected. There is no difference in the absolute value of the capacitance due to the difference, and the presence or absence of touch can be determined with a single threshold value.

Step7
The maximum correction capacitances Dyc (j0) and Dxc (i0) of the detection row wiring 2 and the detection column wiring 3 in the horizontal direction and the vertical direction are interpolated with the correction capacitances of the detection wirings adjacent to the respective correction capacitances. To calculate the touch coordinates.

Step8
The touch coordinates calculated in Step 7 are sent to a computer or the like as touch coordinate data.

  Next, the correction value described in Step 3 will be described. FIG. 8 is a diagram illustrating an example of correction values in the first embodiment. When the vertical cross section of the touch screen 1 has a convex shape, the contact area by the touch of the indicator 15 is larger at the upper end portion in the vertical direction than the lower end portion, and the width of the detection row wiring 2 is formed wider. ing. Therefore, in order to make the capacitance uniform, the correction value ky (j) is set to be smaller as the capacitance corresponding to the detection row wiring 2 at the upper end. Further, when the vertical cross section of the touch screen 1 is concave, the lower end portion has a larger contact area than the upper end portion, and the width of the detection row wiring 2 is formed wider. Therefore, in order to make the capacitance uniform, the correction value ky (j) is set to be smaller as the capacitance corresponding to the detection column wiring 2 at the lower end.

  Here, the correction values corresponding to the respective row numbers are shown in a linear relationship, but in practice, it may be non-linear. An optimum correction value that is complementary to the influence of the width of the detection row wiring 2 may be obtained and stored in the touch coordinate calculation circuit 22.

  When calculating the touch coordinates using the detection row wiring 2 and the detection column wiring 3 showing the maximum corrected capacitance and the capacitance of the detection row wiring 2 and the detection column wiring 3 adjacent thereto, When the length of the contact portion of the body 15 in the direction orthogonal to the detection row wiring 2 and the detection column wiring 3 is smaller than the width of the detection row wiring 2 and the detection column wiring 3, respectively, the adjacent wiring is indicated. Capacitance is less likely to occur between the body 15 and the touch coordinates cannot be calculated with high accuracy by interpolating the capacitance of the plurality of detection wirings. In other words, a dead zone for position determination occurs.

  In the first embodiment, the width of the detection row wiring 2 is changed in accordance with the change in the contact area of the indicator 15 that occurs when a curved touch screen is touched. For this reason, even when the contact portion of the indicator 15 is reduced, the indicator 15 is also electrostatically connected between the detection row wiring 2 adjacent to the detection row wiring 2 that exhibits the maximum capacitance. A capacitance is formed. By interpolating these capacitances, the touch coordinates can be calculated with high accuracy, and a projected capacitive touch panel that can obtain the touch coordinates with high accuracy over the entire surface of the touch screen 1 can be obtained. it can.

Embodiment 2
The touch screen 1 according to the first embodiment has been described in which the longitudinal section has a convex shape or a concave shape. In the second embodiment, a case where the cross section in the horizontal direction of the touch screen 1 has a convex shape or a concave shape will be described.

  FIG. 9 is a diagram showing the configuration of the touch screen detection row wiring in the touch panel according to the second embodiment of the present invention, and the relationship between the indicator and the touch screen at the time of touch. FIG. 9A shows the configuration of the detection column wiring 3 of the touch screen 1 having a convex section in the horizontal direction, and FIG. 9B shows the configuration of the touch screen 1 having a concave section in the horizontal direction. The configuration of the column wiring 3 is shown. Further, in the right half of FIG. 9, the angle formed between the touch screen 1 and the indicator 15 when the finger is placed on such a touch screen and the center and both ends in the lateral direction of the touch screen 1 are touched, The image figure of the contact area of the part which touched is shown.

  The angles formed by the touch screen 1 and the indicator 15 (alpha, β, and γ in the order of left, center, and right) are β> α = γ when the cross section in the lateral direction is convex as shown in FIG. When the cross section in the lateral direction is concave from FIG. 9B, α = γ> β. That is, regarding the size of the angle formed by the touch screen 1 and the indicator 15, the relationship between both end portions and the central portion is reversed depending on whether the touch screen 1 is convex or concave.

  However, the contact area is larger at both end portions than at the central portion regardless of whether the touch screen 1 is convex or concave. Therefore, when the touch coordinates are calculated by interpolating the capacitance of the detection column wiring 3 showing the maximum capacitance due to the touch of the indicator 15 and the adjacent detection column wiring 3, a dead zone is generated. No matter whether the touch screen 1 has a convex shape or a concave shape, the width of the detection column wiring 3 in the center is narrow and both end portions are wide.

  In the second embodiment, since the curved surface state of the touch screen 1 is different from that in the first embodiment, the width distribution of the detection row wiring 2 and the detection column wiring 3 is as shown in FIGS. Is different. Therefore, in the calculation of touch coordinates, it is necessary to reverse the order in the vertical direction and the horizontal direction and perform correction and comparison with a threshold value. Basically, the same method as in the first embodiment is used. According to the steps shown in (1), capacitance measurement, baseline correction, contact area influence correction, touch coordinate calculation, and the like can be performed.

  In the second embodiment, the width of the detection column wiring 3 is changed in accordance with the change in the contact area of the indicator 15 that occurs when the curved touch screen 1 is touched. For this reason, even when the contact portion of the indicator 15 becomes small, a capacitance is formed between the adjacent wiring of the wiring showing the maximum capacitance and the indicator 15, and these electrostatic capacitances are formed. The touch coordinates can be calculated with high accuracy by interpolating the capacitance.

Embodiment 3 FIG.
The touch screen 1 according to the first embodiment has been described in which the detection row wirings 2 and the detection column wirings 3 formed of the thin-line electrodes 4 and 5 are formed. The touch screen according to the third embodiment uses continuous rhombus electrodes made of a transparent conductive film, which is generally well known as a detection row wiring and a detection column wiring.

  FIG. 10 is a diagram showing a configuration of a touch screen in the touch panel according to Embodiment 3 of the present invention. FIG. 10A shows a configuration of the detection row wirings 50 and the detection column wirings 51 when the vertical section of the touch screen 1 has a convex shape. The width Px in the horizontal direction of the detection row wiring 50 and the detection column wiring 51 is constant, and the vertical width Py is formed so as to be gradually narrowed from the upper end to the lower end.

  FIG. 10B shows a configuration of the detection column wiring 50 and the detection row wiring 51 when the longitudinal section of the touch screen 1 has a concave shape. The width Px in the horizontal direction of the detection row wiring 50 and the detection column wiring 51 is constant, and the vertical width Py is formed so as to gradually increase from the upper end to the lower end.

  Other configurations are the same as those of the first embodiment, and the touch coordinates can be calculated with high accuracy by changing the wiring width of the detection row wiring in accordance with the change in the contact area of the indicator.

Embodiment 4 FIG.
In the present embodiment, a liquid crystal display device that is attached by attaching the liquid crystal display panel 61 to the touch screen 1 in the above-described first embodiment and integrally configures the touch panel and the liquid crystal display panel will be described.

  FIG. 11 is a cross-sectional view showing a configuration of a liquid crystal display device according to Embodiment 4 of the present invention. FIG. 11A shows a case where the longitudinal section has a convex shape, and FIG. 11B shows a case where the longitudinal section has a concave shape. The liquid crystal display device includes a touch screen 1, a liquid crystal display panel 61, and a backlight 69. The liquid crystal display panel 61 includes a polarizing plate 62, an adhesive layer 63, a color filter substrate 64, a liquid crystal layer 65, a TFT array substrate 66, an adhesive layer 67, and a polarizing plate 68.

  The color filter substrate 64 has a color filter, a black matrix, a transparent electrode, and an alignment film formed on a glass substrate. The TFT array substrate 66 has a switching element such as a thin film transistor (abbreviation: TFT) formed on a glass substrate. The liquid crystal layer 65 is sandwiched between the color filter substrate 64 and the TFT array substrate 66 and uses a twisted nematic (abbreviated as TN) mode liquid crystal.

  The polarizing plate 68 is adhered to the back surface (lower surface) of the TFT array substrate 66 by the adhesive layer 67. Further, a polarizing plate 62 is adhered to the surface (upper surface) of the color filter substrate 64 by an adhesive layer 63. Further, a backlight 69 as a light source is disposed on the back side of the liquid crystal display panel 61.

  Further, the touch screen 1 according to the first embodiment is adhered to the polarizing plate 62 disposed on the front side of the liquid crystal display panel 61 by the adhesive layer 60.

  An image signal corresponding to an image to be displayed is input to the TFT array substrate 66 from an external driver circuit (not shown). The TFT array substrate 66 changes the alignment state of the liquid crystal molecules by controlling the voltage applied to the liquid crystal layer 65 via a switching element formed by the TFT formed for each pixel in accordance with the input image signal.

  Incident light from the backlight 69 passes through the polarizing plate 68 to become linearly polarized light, and passes through the liquid crystal layer 65 so that the vibration direction is bent according to the signal of the image to be displayed. The light whose vibration direction is bent passes through the color filter formed on the color filter substrate 64 and is separated into light of the three primary colors, and further passes through the polarizing plate 62 on the front side, so as to respond to the image signal. The light has a high light intensity. Further, the light passing through the polarizing plate 62 passes through the touch screen 1 on the front surface and is visually recognized by the user as display light.

  In this way, the liquid crystal display device performs a desired display by controlling the transmittance of light from the backlight 69 in accordance with the image signal. In addition, touch panel 100 including touch screen 1 calculates touch coordinates in the same manner as in the first embodiment, and outputs the calculated touch coordinates as touch coordinate data.

  In the liquid crystal display device according to the third embodiment, since the touch screen 1 is attached to the display panel 61 and configured integrally, the touch screen holding mechanism which has been conventionally required can be eliminated, and the entire device can be thinned. It becomes possible.

  In addition, since the touch screen 1 and the display panel 61 are integrally formed, dust and the like are prevented from entering the gap between the touch screen 1 and the display panel 61, and adverse effects on the display caused by the dust and the like are prevented. be able to.

  As described in the first embodiment, in the touch screen 1, the slit-shaped gaps 6 and 7 of the plurality of detection row wirings 2 and the detection column wirings 3 are set large to transmit the display light. The decline in rate is suppressed. As a result, most of the light passing through the polarizing plate 62 passes through the touch screen 1 and becomes display light. Therefore, even if the touch screen 1 is disposed on the front surface of the liquid crystal display panel 61, the display luminance is hardly lowered.

  In the fourth embodiment, the liquid crystal display device is configured to include the touch panel 100 including the touch screen 1 according to the first embodiment described above, but the touch panel including the touch screen 1 according to the second embodiment described above. It may be provided.

  Furthermore, the display panel that can be used in the fourth embodiment is not limited to the liquid crystal display panel using the TN mode liquid crystal, and other display modes such as a liquid crystal display panel of another liquid crystal display mode, an EL display panel, and the like. The display panel can also be used.

  In each of the above embodiments, the finger has been described as the indicator 15. However, the present invention is not limited to this, and the relative angle between the touch screen 1 and the indicator 15 differs depending on the position on the touch screen 1, As long as the contact areas are different from each other, for example, an indicator bar having a round tip may be used.

  Within the scope of the present invention, the present invention can be freely combined with each other, or can be appropriately modified or omitted.

1 touch screen,
2 row wiring for detection,
3 column wiring for detection,
15 indicator,
20 switch circuit,
21 Capacitance detection circuit 22 Touch coordinate calculation circuit 50 Column wiring for detection,
51 row wiring for detection,
61 LCD panel,
100 Touch panel.

Claims (8)

  1. It has a plurality of detection row wirings arranged in the horizontal direction and a plurality of detection column wirings arranged in the vertical direction, and the vertical cross section has a convex shape or a concave shape, and is touched by an indicator. A touch screen to be operated,
    A switch circuit that sequentially selects a plurality of the row wirings for detection and the column wirings for detection;
    A capacitance detection circuit for detecting a capacitance of the detection row wiring and the detection column wiring selected by the switch circuit;
    A touch coordinate calculation circuit that calculates touch coordinates on the touch screen touched by the indicator based on a detection result of the capacitance detection circuit;
    When the width of the row wiring for detection is a convex shape in the vertical section of the touch screen, the width of the touch screen is gradually narrowed from the upper end to the lower end in the vertical direction. In the case of a concave shape, the touch panel is formed so as to be gradually widened from the upper end to the lower end in the vertical direction of the touch screen.
  2. It has a plurality of detection row wirings arranged in the horizontal direction and a plurality of detection column wirings arranged in the vertical direction, and the cross section in the horizontal direction is convex or concave, and it is touched by an indicator. A touch screen to be operated,
    A switch circuit that sequentially selects a plurality of the row wirings for detection and the column wirings for detection;
    A capacitance detection circuit for detecting a capacitance of the detection row wiring and the detection column wiring selected by the switch circuit;
    A touch coordinate calculation circuit that calculates touch coordinates on the touch screen touched by the indicator based on a detection result of the capacitance detection circuit;
    The touch panel, wherein the width of the detection column wiring is formed so as to gradually increase from the lateral center to both ends of the touch screen.
  3. The touch coordinate calculation circuit has a correction value in a complementary relationship with the distribution of the width of the detection row wiring in the plane of the touch screen corresponding to each detection row wiring,
    The touch panel according to claim 1, wherein the capacitance of each of the detection row wirings is corrected using the correction value.
  4. The touch coordinate calculation circuit obtains a detection row wiring in which the capacitance corrected using the correction value exceeds a predetermined value and becomes maximum, and each of the above-mentioned values is calculated using a correction value corresponding to the detection row wiring. The touch panel according to claim 3, wherein the capacitance of the detection column wiring is corrected.
  5. The touch coordinate calculation circuit has a correction value complementary to the distribution of the width of the detection column wiring in the plane of the touch screen corresponding to each detection column wiring,
    The touch panel according to claim 2, wherein the capacitance of each of the detection column wirings is corrected using the correction value.
  6. The touch coordinate calculation circuit obtains a detection column wiring in which the capacitance corrected using the correction value exceeds a predetermined value and becomes the maximum, and each of the above-mentioned values is calculated using a correction value corresponding to the detection column wiring. The touch panel according to claim 5, wherein the capacitance of the detection row wiring is corrected.
  7. The touch panel according to any one of claims 1 to 6,
    A display panel mounted on the touch screen of the touch panel.
  8. The display device according to claim 7, wherein the touch screen is adhesively fixed to a front side of the display panel.
JP2011160994A 2011-07-22 2011-07-22 Touch panel and display device including the same Withdrawn JP2013025626A (en)

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JP2015108958A (en) * 2013-12-04 2015-06-11 大日本印刷株式会社 Transfer foil including touch panel sensor, method for manufacturing transfer foil, display device with touch position detection function including touch panel sensor, and method for manufacturing display device with touch position detection function
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US9152267B2 (en) 2013-07-31 2015-10-06 Lg Display Co., Ltd. Display device with touch screen
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US10534457B2 (en) 2013-12-02 2020-01-14 Semiconductor Energy Laboratory Co., Ltd. Touch panel and method for manufacturing touch panel
JP2015108958A (en) * 2013-12-04 2015-06-11 大日本印刷株式会社 Transfer foil including touch panel sensor, method for manufacturing transfer foil, display device with touch position detection function including touch panel sensor, and method for manufacturing display device with touch position detection function
WO2015146116A1 (en) * 2014-03-27 2015-10-01 パナソニックIpマネジメント株式会社 Vibration module and electronic device
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WO2015174126A1 (en) * 2014-05-16 2015-11-19 富士フイルム株式会社 Conductive sheet for touchscreen and capacitive touchscreen
US10459588B2 (en) 2014-07-14 2019-10-29 Samsung Display Co., Ltd. Flexible display device with touch panel
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