TWI389022B - Touch detection method and capacitive-type touch control system - Google Patents

Description

Touch detection method and capacitive touch system

The present invention relates to the field of touch detection, and more particularly to a touch detection method and a capacitive touch system implemented on a capacitive touch panel.

Nowadays, touch panels have been widely integrated into various electronic products as input devices. Users only need to touch objects (such as fingers or stylus pens) to slide or touch on the panel to make the cursors With relative movement or absolute coordinate movement, various inputs including text writing, scrolling windows, and virtual buttons can be completed. The capacitive touch panel is a touch panel that can be moved by a finger on a smooth panel to control the movement of the cursor. When the finger touches the panel, the first sensing of the touched position (ie, the touch point) The amount of inductive energy in the direction and the second sensing direction will change. By detecting the magnitude of the inductive energy, it can be determined whether the object touches the capacitive touch panel and calculates the touch position coordinates.

In the design of some capacitive touch panels, due to some technical considerations (such as winding problems or system detection capabilities), only large sensing pads can be used, such as 5 mm × 5 mm. Or a 7 mm × 7 mm size sensing pad; thus, it can be seen that the difference between the resolution of the capacitive touch panel and the resolution of the display panel is quite large, and it is easy to generate low resolution. Degree corresponds to the distortion caused by high resolution. Therefore, how to reduce the corresponding distortion by correspondingly a lower resolution capacitive touch panel to a high-resolution display panel is an urgent problem to be solved.

One of the objectives of the present invention is to provide a touch detection method to reduce distortion caused by a lower resolution capacitive touch panel corresponding to a higher resolution display panel.

It is still another object of the present invention to provide a capacitive touch system.

A touch detection method is implemented in a capacitive touch panel according to an embodiment of the present invention. The touch detection method includes the steps of: finding a first sensing pad and a second sensing in a first sensing direction. The first sensing pad is configured to sense the highest energy in the first sensing direction when the object touches the capacitive touch panel, and the second sensing pad is in the sensing pad adjacent to the first sensing pad. Sensing the highest energy; and according to the ratio between the sensing energy difference and the position distance of the first sensing pad and the second sensing pad, setting the output touch position in the first sensing direction in the first sense The specific location between the pad and the second sensing pad.

In an embodiment of the invention, the output touch position set in the first sensing direction is determined according to a ratio between a sensing energy difference between the first sensing pad and the second sensing pad and a position distance. The step of the specific portion between the first sensing pad and the second sensing pad includes: respectively, in the first coordinate and the second coordinate space corresponding to the first sensing pad and the second sensing pad respectively in the first sensing direction Inserting at least one virtual coordinate; and according to a ratio between a sensing energy difference of the first sensing pad and the second sensing pad and a position distance, a coordinate of the output touch position set in the first sensing direction is The first bar is labeled with a particular one of the aforementioned at least one virtual coordinate.

In an embodiment of the invention, the position distance between the first sensing pad and the second sensing pad is a length of a line connecting the geometric centers of the first sensing pad and the second sensing pad.

In an embodiment of the invention, the touch detection method further includes the steps of: finding a third sensing pad and a fourth sensing pad in the second sensing direction, where the third sensing pad is an object touch capacitance The touch sensor panel senses the highest energy in the second sensing direction, and the fourth sensing pad is the highest sensing energy in the sensing pad adjacent to the third sensing pad; and according to the third sensing a ratio between a sensing energy difference value of the pad and the fourth sensing pad and a position distance, and an output touch position set in the second sensing direction at a specific position between the third sensing pad and the fourth sensing pad .

A capacitive touch system according to another embodiment of the present invention includes: a capacitive touch panel, a display panel, and a host; the capacitive touch panel includes: a capacitive sensing pad array, a first processing device, and a second Processing device. The capacitive sensing pad array includes a plurality of sensing pads arranged along the first sensing direction and a plurality of sensing pads arranged along the second sensing direction, and the first processing device and the senses arranged along the first sensing direction The test pads are electrically coupled, and the second processing device is electrically coupled to the sensing pads arranged along the second sensing direction and communicates with the first processing device through the first communication interface, and the host and the display panel are electrically connected And communicating with one of the first processing device and the second processing device of the capacitive touch panel through the second communication interface to receive the output generated by the first processing device in the first sensing direction The touch position and the output touch position generated by the second processing device in the second sensing direction, and the cursor displayed by the display panel is controlled according to the output touch positions. The first processing device is adapted to perform the following steps: finding the first sensing pad and the second sensing pad in the first sensing direction, where the first sensing pad is an object touching the capacitive touch panel The capacitive sensing pad array senses the highest energy in the first sensing direction, and the second sensing pad is the highest sensing energy in the sensing pad adjacent to the first sensing pad; and according to the first a ratio between a sensing energy difference between the sensing pad and the second sensing pad and a position distance, wherein the output touch position set in the first sensing direction is between the first sensing pad and the second sensing pad Specific.

In an embodiment of the present invention, the first processing device performs the ratio between the sensing energy difference and the position distance of the first sensing pad and the second sensing pad, and is set in the first sensing direction. The step of the output touch position on the specific portion between the first sensing pad and the second sensing pad includes: first corresponding to the first sensing pad and the second sensing pad respectively in the first sensing direction Intersecting at least one virtual coordinate between the coordinate and the second coordinate; and setting the first sensing direction according to a ratio between a sensing energy difference and a positional distance between the first sensing pad and the second sensing pad The coordinate of the output touch position is a specific one of the first coordinate and at least one of the aforementioned virtual coordinates. The position distance between the first sensing pad and the second sensing pad may be a length of a line connecting the geometric centers of the first sensing pad and the second sensing pad.

In an embodiment of the present invention, the second processing device of the capacitive touch control system is adapted to perform the following steps: finding a third sensing pad and a fourth sensing pad in the second sensing direction, and third The sensing pad is the one that senses the highest energy in the second sensing direction when the object touches the capacitive sensing pad array of the capacitive touch panel, and the fourth sensing pad is adjacent to the third sensing pad. The highest sensing energy in the measuring pad; and the output touch position set in the second sensing direction according to a ratio between the sensing energy difference of the third sensing pad and the fourth sensing pad and the position distance At a specific location between the third sensing pad and the fourth sensing pad.

In the embodiment of the present invention, an object (for example, a finger) of the capacitive touch panel is in contact with the characteristic of the sensing pad area and the sensing energy, and more coordinates are inserted between the adjacent sensing pads, and It senses the ratio between the energy difference and the position distance to derive a position closer to the actual touch of the object. Therefore, the resolution of the capacitive touch panel can be effectively improved, and the distortion caused by the display panel corresponding to the higher resolution can be reduced.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. The directional terms mentioned in the following embodiments, such as up, down, left or right, etc., are only directions referring to the additional drawings. Therefore, the directional terminology used is for the purpose of illustration and not limitation.

FIG. 1 is a structural block diagram of a capacitive touch system according to an embodiment of the present invention. The capacitive touch system 10 includes a capacitive touch panel 12 , a host 14 , and a display panel 16 .

The capacitive touch panel 12 includes a capacitive sensing pad array 120, an X sensing direction processing device 122, and a Y sensing direction processing device 124. The capacitive sensing pad array 120 includes a plurality of sensing lines 1201 disposed in parallel with each other and extending in the X sensing direction, and a plurality of sensing lines 1203 disposed in parallel with each other and extending in the Y sensing direction. Each of the sensing lines 1201 includes a plurality of diamond-shaped sensing pads 1201P (shown in FIG. 2) arranged along the X sensing direction, and each of the sensing lines 1203 includes a plurality of diamond-shaped sensings arranged along the Y sensing direction. Pad 1203P (shown in Figure 4). The X sensing direction processing device 122 is electrically coupled to the sensing pads 1201P of the sensing lines 1201 arranged along the X sensing direction. The Y sensing direction processing device 124 is electrically coupled to the sensing pads 1203P arranged along the Y sensing direction and communicates with the X sensing direction processing device 122 through the communication interface 123.

The host 14 is electrically coupled to the display panel 16; the host 14 communicates with the Y sensing direction processing device 124 of the capacitive touch panel 12 through the main communication interface 13 to receive the X generated by the X sensing direction processing device 122. The output touch position in the sensing direction and the output touch position generated by the Y sensing direction processing device 124 in the Y sensing direction, and the cursor 160 displayed on the display panel 16 is controlled according to the output touch positions. Of course, the host 14 can also communicate with the X-sensing direction processing device 122 of the capacitive touch panel 12 through the main communication interface 13 instead of the Y-sensing direction processing device 124, which can achieve the same effect.

A touch detection method performed on the capacitive touch panel 12 of the touch detection system 10 will be specifically described below with reference to FIGS. 2 to 4 .

Referring to FIG. 2, when an object such as a single finger 20 touches the capacitive sensing pad array 120 of the capacitive touch panel 12, a specific (x+1)th sensing pad 1201P is found in the X sensing direction. The xth sensing pad 1201P, and acquires the sensing energy difference ΔEx and the position distance ΔDx of the (x+1)th sensing pad 1201P and the xth sensing pad 1201P. The (x+1)th sensing pad 1201P is the one that senses the highest energy in the X sensing direction when the finger 20 touches the capacitive sensing pad array 120, and the xth sensing pad 1201P is the same as the (x) +1) the sensing pad 1201P adjacent to the sensing pad has the highest sensing energy; the position distance ΔDx of the (x+1)th sensing pad 1201P and the xth sensing pad 1201P is, for example, both The length of the connection of the geometric center Cx.

Referring to FIG. 3, the output touch position set in the X sensing direction according to the ratio (ΔEx/ΔDx) between the sensing energy difference ΔEx and the position distance ΔDx is at (x+1)th sensing pad. The step of the specific portion between the 1201P and the xth sensing pad 1201P. Specifically, the following steps may be included:

(1) coordinates (*+1) and coordinates A*x respectively corresponding to the X-th sense pad 1201P and the x-th sense pad 1201P in the X-sensing direction by interpolation Interpolate (2N+1) virtual coordinates. Where A is the coordinate amplification factor in the X sensing direction, and the midpoint coordinate between the coordinate A*(x+1) and the coordinate A*x is (A*x+A/2), two adjacent each The distance between the coordinates is A/2(N+1).

(2) setting the ratio (ΔEx/ΔDx) between the sensing energy difference ΔEx and the position distance ΔDx of the (x+1)th sensing pad 1201P and the xth sensing pad 1201P, in the x sensing direction The coordinates of the output touch position on the coordinates are a specific one of the coordinates Δ*(x+1) and (2N+1) virtual coordinates (for example, the virtual coordinates enclosed by the ellipse in FIG. 3). Wherein, the larger the ratio (ΔEx/ΔDx), the closer the coordinate of the output touch position in the X sensing direction is to the coordinate Δ*(x+1), and the value of ΔEx is correspondingly larger.

Similarly, referring to FIG. 4, when a single finger 20 touches the capacitive sensing pad array 120 of the capacitive touch panel 12, a specific (y+1)th sensing pad 1203P is found in the Y sensing direction. And the yth sensing pad 1203P, and acquiring the sensing energy difference ΔEy and the position distance ΔDy of the (y+1)th sensing pad 1203P and the yth sensing pad 1203P. The (y+1)th sensing pad 1203P is the one that senses the highest energy in the Y sensing direction when the finger 20 touches the capacitive sensing pad array 120, and the yth sensing pad 1203P is the same (y) +1) the sensing pad 1203P adjacent to the sensing pad is the highest in the sensing energy; the position distance ΔDy of the (y+1)th sensing pad 1203P and the yth sensing pad 1203P is, for example, both The length of the connection of the geometric center Cy.

Referring to FIG. 5, the output touch position set in the Y sensing direction according to the ratio (ΔEy/ΔDy) between the sensing energy difference ΔEy and the position distance ΔDy is at (y+1)th sensing pad. The step of specific between 1203P and the yth sensing pad 1203P. Specifically, the following steps may be included:

(1) Using the interpolation method, the coordinates B*(y+1) and coordinates B*y corresponding to the (y+1)th sensing pad 1203P and the yth sensing pad 1203P in the Y sensing direction, respectively. Interpolate (2M+1) virtual coordinates. Where B is the coordinate amplification factor in the Y sensing direction, and the midpoint coordinate between the coordinate B*(y+1) and the coordinate B*y is (B*y+B/2), and each adjacent two The distance between the coordinates is B//2 (M+1).

(II) setting the ratio (ΔEy/ΔDy) between the sensing energy difference ΔEy of the (y+1)th sensing pad 1203P and the yth sensing pad 1203P and the positional distance ΔDy, in the Y sensing direction The coordinates of the output touch position on the coordinates are specific ones of the coordinates B*(y+1) and (2M+1) virtual coordinates (for example, the virtual coordinates enclosed by the ellipse in FIG. 5). Wherein, the larger the ratio (ΔEy/ΔDy), the closer the coordinate of the output touch position in the Y sensing direction is to the coordinate B*(y+1), and the value of ΔEy is correspondingly larger.

At this point, the coordinates of the touch position of the finger 20 on the capacitive sensing pad array 120 of the capacitive touch panel 12, that is, the coordinates of the output touch position in the X, Y sensing direction, are known. For the touch detection method of the present embodiment, the steps shown in FIG. 2 and FIG. 3 can be performed by the X-sensing direction processing device 122 of the capacitive touch panel 10, and the steps illustrated in FIG. 4 and FIG. The Y sensing direction processing device 124 of the touch panel 10 is executed.

It should be noted that the touch detection method proposed in the foregoing embodiment of the present invention is described by taking a single touch as an example, but the same applies to the case of multi-touch. In the case of a multi-touch, the touch detection method according to the embodiment of the present invention is performed once for each touch position, and the output touch corresponding to each touch position in the X, Y sensing direction can be obtained. position.

In summary, the foregoing embodiments of the present invention use an object (such as a finger) of a capacitive touch panel to contact the sensing pad area in proportion to the sensing energy, and interpolate between adjacent sensing pads. More coordinates, and based on the ratio between the measured energy difference and the position distance, to calculate the position closer to the actual touch of the object. Therefore, the resolution of the capacitive touch panel can be effectively improved, and the distortion caused by the display panel corresponding to the higher resolution can be reduced.

In addition, those skilled in the art can also appropriately change the touch detection method and the capacitive touch system proposed by the foregoing embodiments of the present invention, such as appropriately changing the shape of the sensing pad, the structural configuration of the capacitive touch system, and/or Or the method of determining the position distance and so on.

While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

10. . . Capacitive touch system

12. . . Capacitive touch panel

120. . . Capacitive sensing pad array

1201, 1203. . . Sensing line

122. . . X sensing direction processing device

123. . . Communication interface

124. . . Y sensing direction processing device

13. . . Main communication interface

14. . . Host

16. . . Display panel

160. . . cursor

ΔEx, ΔEy. . . Sensing energy difference

ΔDx, ΔDy. . . Position distance

Cx, Cy. . . Geometric center

1201P, 1203P. . . Sensing pad

20. . . finger

FIG. 1 is a structural block diagram of a capacitive touch system according to an embodiment of the present invention.

FIG. 2 illustrates a touch detection method according to an embodiment of the present invention for finding a specific two sensing pads in the X sensing direction and acquiring sensing energy difference values and position distances of the two sensing pads. step.

3 is a diagram showing the ratio of the sensing energy difference and the position distance of the two specific sensing pads found in FIG. 2 according to the touch detection method according to the embodiment of the present invention. The step of touching the location.

FIG. 4 illustrates a touch detection method according to an embodiment of the present invention for finding a specific two sensing pads in the Y sensing direction and acquiring sensing energy difference values and position distances of the two sensing pads. step.

FIG. 5 is a diagram showing the ratio of the sensing energy difference and the position distance of the two specific sensing pads found in FIG. 4 according to the touch detection method according to the embodiment of the present invention. The step of touching the location. .

ΔEx. . . Sensing energy difference

ΔDx. . . Position distance

Cx. . . Geometric center

1201P. . . Sensing pad

20. . . finger

Claims (10)

A touch detection method is implemented in a capacitive touch panel. The touch detection method includes the steps of: finding a first sensing pad and a second sensing pad in a first sensing direction, where The first sensing pad is the one that senses the highest energy in the first sensing direction when the object touches the capacitive touch panel, and the second sensing pad is adjacent to the first sensing pad. The highest sensing energy in the pad; and an output set in the first sensing direction according to a ratio between a sensing energy difference and a position distance of the first sensing pad and the second sensing pad The touch position is at a specific location between the first sensing pad and the second sensing pad. The touch detection method of claim 1, wherein the ratio between the sensing energy difference and the position distance of the first sensing pad and the second sensing pad is set to the first The step of the output touch position in the sensing direction at the specific portion between the first sensing pad and the second sensing pad includes: the first sensing pad and the second sensing pad are in the first Interspersing at least one virtual coordinate between a first coordinate and a second coordinate corresponding to each of the sensing directions; and sensing energy difference and position distance according to the first sensing pad and the second sensing pad The ratio of the output touch position set in the first sensing direction is a specific one of the first coordinate and the at least one virtual coordinate. The touch detection method of claim 1, wherein the distance between the first sensing pad and the second sensing pad is the geometry of the first sensing pad and the second sensing pad. The length of the connection to the center. The touch detection method of claim 1, further comprising the steps of: finding a third sensing pad and a fourth sensing pad in a second sensing direction, the third sensing pad Sensing the highest energy in the second sensing direction when the object touches the capacitive touch panel, the fourth sensing pad is sensing in the sensing pad adjacent to the third sensing pad The highest energy; and an output touch position set in the second sensing direction according to a ratio between the sensing energy difference and the position distance of the third sensing pad and the fourth sensing pad; A specific portion between the third sensing pad and the fourth sensing pad. The touch detection method of claim 4, wherein the ratio between the sensing energy difference and the position distance of the first sensing pad and the second sensing pad is set to the first The step of the output touch position in the sensing direction at the specific portion between the first sensing pad and the second sensing pad includes: the first sensing pad and the second sensing pad are in the first Interspersing at least one virtual coordinate between a first coordinate and a second coordinate corresponding to each of the sensing directions; and sensing energy difference and position distance according to the first sensing pad and the second sensing pad The ratio of the output touch position set in the first sensing direction is a specific one of the first coordinate and the at least one virtual coordinate. A capacitive touch system includes: a capacitive touch panel comprising: a capacitive sensing pad array including a plurality of sensing pads arranged along a first sensing direction and a plurality of second sensing a sensing pad arranged in a direction; a first processing device electrically coupled to the sensing pads arranged along the first sensing direction; a second processing device aligned with the second sensing directions The sensing pad is electrically coupled to communicate with the first processing device through a first communication interface; a display panel; and a host electrically coupled to the display panel and through a second communication interface Communicating with the first processing device and the second processing device of the capacitive touch panel to receive an output touch position generated by the first processing device in the first sensing direction and the And outputting, by the second processing device, the touch position in one of the second sensing directions, and controlling a cursor displayed by the display panel according to the output touch positions; wherein the first processing device is adapted to perform the following steps : at the first sensory side Locating a first sensing pad and a second sensing pad, wherein the first sensing pad is in the first sense when the object touches the capacitive sensing pad array of the capacitive touch panel ???the highest sensing energy in the direction of measurement, the second sensing pad is the highest sensing energy in the sensing pad adjacent to the first sensing pad; and according to the first sensing pad and the second sensing a ratio between the sensing energy difference of the measuring pad and the positional distance, the output touch position set in the first sensing direction is at a specific position between the first sensing pad and the second sensing pad . The capacitive touch system of claim 6, wherein the first processing device performs the sensing energy difference between the first sensing pad and the second sensing pad and the position distance. a ratio, the step of setting the output touch position in the first sensing direction at a specific position between the first sensing pad and the second sensing pad includes: the first sensing pad and the first The second sensing pad interpolates at least one virtual coordinate between a first coordinate and a second coordinate corresponding to the first sensing direction; and sensing according to the first sensing pad and the second sensing pad And a ratio of the energy difference value to the positional distance, the coordinate of the output touch position set in the first sensing direction is a specific one of the first coordinate and the at least one virtual coordinate. The capacitive touch system of claim 6, wherein the distance between the first sensing pad and the second sensing pad is the geometry of the first sensing pad and the second sensing pad. The length of the connection to the center. The capacitive touch system of claim 6, wherein the second processing device is adapted to perform the following steps: finding a third sensing pad and a fourth in the second sensing direction a sensing pad, the third sensing pad is configured to sense the highest energy in the second sensing direction when the object touches the capacitive sensing pad array of the capacitive touch panel, the fourth sensing pad The highest sensing energy in the sensing pad adjacent to the third sensing pad; and the ratio between the sensing energy difference and the position distance according to the third sensing pad and the fourth sensing pad The output touch position set in the second sensing direction is at a specific position between the third sensing pad and the fourth sensing pad. The capacitive touch system of claim 9, wherein the first processing device performs the sensing energy difference between the first sensing pad and the second sensing pad and the position distance. a ratio, the step of setting the output touch position in the first sensing direction at a specific position between the first sensing pad and the second sensing pad includes: the first sensing pad and the first The second sensing pad interpolates at least one virtual coordinate between a first coordinate and a second coordinate corresponding to the first sensing direction; and sensing according to the first sensing pad and the second sensing pad And a ratio of the energy difference value to the positional distance, the coordinate of the output touch position set in the first sensing direction is a specific one of the first coordinate and the at least one virtual coordinate.