TWI694370B - Touch system - Google Patents

Abstract

A touch system includes channel electrodes that are mapped to touch pixels such that a number of the channel electrodes in each dimension is lower than a number of the touch pixels in said dimension. In one embodiment, each channel electrode has different adjacent channel electrodes at different positions of the mapped touch pixel. In another embodiment, each touch pixel in said dimension is laterally extended to at least one adjacent touch pixel in said dimension. In a further embodiment, original sensing channel electrodes and mirrored sensing channel electrodes are alternately corresponded to the driving channel electrodes.

Description

Touch system

The invention relates to a touch control system, in particular to a capacitive touch control system with fewer channel electrodes.

The touch screen is an input/output device combining a touch panel (and its circuit) and a display panel (such as a liquid crystal display panel). The touch screen allows users to directly interact with the content shown on the display panel, and has been widely used in electronic devices, such as smart phones, tablet computers, wearable devices, etc.

Capacitive sensing is one of the more popular touch sensing technologies. When the human body touches the surface of the touch screen, it will change the electrostatic field of the touch screen, which can be measured by changing the capacitance value.

As the resolution of the touch screen increases, more channels and their winding space are needed. In addition, larger circuits are needed to cope with more channels. Therefore, the active area of the touch screen will be sacrificed, and the performance and sensitivity will also be affected.

Therefore, there is an urgent need to propose a novel capacitive touch screen, which will not sacrifice performance and sensitivity when the resolution is increased.

In view of the above, one of the objects of the embodiments of the present invention is to propose a capacitive touch system that has fewer channel electrodes, enhances accuracy, and/or improves the ghosting touch problem.

According to one embodiment of the present invention, the self-capacitance touch system includes a touch panel and a sensing circuit. The touch panel includes a plurality of touch pixels and a plurality of channel electrodes. The sensing circuit uses the channel electrodes Receive and process sensing signals from the touch panel. The channel electrodes are mapped to the touch pixels so that the number of channel electrodes along each dimension is smaller than the number of touch pixels in the dimension. Each channel electrode located at a different mapped touch pixel position has a different adjacent channel electrode. According to another embodiment of the present invention, each touch pixel along the dimension extends laterally to at least one adjacent touch pixel of the same dimension.

According to yet another embodiment of the present invention, a mutual capacitance touch system includes a touch panel, a driving circuit, and a sensing circuit. The touch panel includes a plurality of touch pixels, a plurality of driving channel electrodes and a plurality of sensing channel electrodes. The driving circuit generates driving signals and transmits the driving channel electrodes to the touch panel. The sensing circuit receives and processes sensing signals from the touch panel through the sensing channel electrodes. The channel electrodes are mapped to the touch pixels so that the number of channel electrodes along each dimension is smaller than the number of touch pixels in the dimension. Mirroring the original sensing channel electrodes along this dimension to form the mirroring sensing channel electrodes, and then alternately mapping the original sensing channel electrodes and the mirroring sensing channel electrodes to the driving channel electrodes. Alternatively, the original drive channel electrodes along this dimension are mirrored to form mirror drive channel electrodes, and then the original drive channel electrodes and the mirror drive channel electrodes are alternately mapped to the sensing channel electrodes.

100: Self-capacitance touch system

11: Touch panel

12: sensing circuit

200: Mutual capacitance touch system

21: Touch panel

22: Drive circuit

23: sensing circuit

RX1~RXn: channel electrode/sensing channel electrode

RY1~RYm: channel electrode

TX1~TXm: drive channel electrode

RX1~RX24: channel electrode

P1~P5: touch pixels

The first figure shows a block diagram of a self-capacitance touch system according to an embodiment of the present invention, which can be applied to a touch screen.

The second figure illustrates 24-channel electrodes RX1~RX24, which are mapped to 48 touch pixels of the same dimension.

FIG. 3A shows a top view of the touch pixel pattern along the illustrated dimension according to the embodiment of the present invention.

FIG. 3B shows a top view of a touch pixel pattern along an exemplary dimension according to another embodiment of the invention.

The fourth figure shows a block diagram of a mutual capacitance touch system according to another embodiment of the present invention, which can be applied to a touch screen.

The fifth figure illustrates that the original channel electrodes RX1 to RX12 and the mirror channel electrodes RX12 to RX1 are alternately mapped to the driving channel electrodes TX1 to TX4.

The first figure shows a block diagram of a self-capacitance touch system 100 according to an embodiment of the present invention, which can be applied to a touch screen. In this embodiment, the self-capacitance touch system (referred to as the touch system for short) 100 may include the touch panel 11, which may be embedded inside or outside the display panel (eg, liquid crystal display panel). In general, the touch panel 11 with a touch pixel resolution of pxq may include p columns and q rows of touch pixels.

The touch system 100 of this embodiment may include a plurality of (y-axis direction) channel electrodes RX1 to RXn and (x-axis direction) channel electrodes RY1 to RYm, so as to collect sensing signals from the touch panel 11. The touch system 100 of this embodiment may include a sensing circuit 12 that receives and processes the sensing signal to determine the touch position of the touch panel 11.

According to one of the features of this embodiment, the number of channel electrodes along each dimension (or coordinate axis) is less than the number of touch pixels in this dimension. In other words, in this embodiment, each channel electrode can be mapped or connected to more than one touch pixel of the same dimension.

The second figure illustrates 24-channel electrodes RX1~RX24, which are mapped to 48 touch pixels of the same dimension. Among them, the channel electrodes RX1~RX24 are mapped to the first 24 touch pixels in the first order, and then the channel electrodes RX1~RX24 are mapped to the rear 24 touches in the second order (which is different from the first order) Pixels. In this embodiment, the channel electrodes RX1 to RX24 are sequentially assigned to a plurality (for example, three) groups in the second order illustrated in the second figure. Thereby, the first channel electrode RX1 is assigned to the first group, the second channel electrode RX2 is assigned to the second group, the third channel electrode RX3 is assigned to the third group, and the fourth channel electrode RX4 is assigned to the first group , The fifth channel electrode RX5 is assigned to the second group, the sixth channel electrode RX6 is assigned to the third group, and so on. In other words, if there are r groups in total, every r channel electrodes will be assigned to the same group.

According to another feature of this embodiment, each channel electrode located at a different mapped touch pixel location has a different adjacent channel electrode (combination). As illustrated in the second figure, the channel electrode RX2 on the left mapped touch pixel position has adjacent channel electrodes RX1 and RX3, while the channel electrode RX2 on the right mapped touch pixel position has adjacent channel electrode RX22 With RX5. Since the sensing signals of different channel electrode combinations are different, the touch position of the touch panel 11 can be correctly determined without ghost touch problems.

FIG. 3A shows a plan view of the touch pixels P1 to P5 along the illustrated dimension (or coordinate axis) according to the embodiment of the present invention. According to yet another feature of this embodiment, each touch pixel along each dimension may laterally extend to the adjacent touch pixel(s) of the same dimension. As illustrated in FIG. 3A, the touch pixels P1 to P5 have an inclined shape. Taking the second touch pixel P2 as an example, it extends laterally to the (left) first touch pixel P1 and (right) the third touch pixel P3. Since each touch pixel includes not only the information of the position of its own touch pixel, but also the information of the position of the adjacent touch pixel, the touch position of the touch panel 11 can be correctly determined and has higher accuracy. The pattern of the touch pixel in this embodiment is not limited to the example illustrated in the third figure A, and can be modified according to specific applications. FIG. 3B shows a plan view of the touch pixels P1 to P5 along the illustrated dimension (or coordinate axis) according to another embodiment of the invention. As illustrated in FIG. 3B, the touch pixels P1 to P5 have a jigsaw shape. Taking the second touch pixel P2 as an example, it extends laterally to the (left) first touch pixel P1 and (right) the third touch pixel P3.

The fourth figure shows a block diagram of a mutual-capacitance touch system 200 according to another embodiment of the present invention, which can be applied to a touch screen. In this embodiment, the mutual capacitance touch system (referred to as a touch system for short) 200 may include a touch panel 21, which may be embedded inside or outside a display panel (eg, a liquid crystal display panel). In general, the touch panel 21 with a touch pixel resolution of pxq may include p columns and q rows of touch pixels.

The touch system 200 of this embodiment may include a driving circuit 22 that generates a driving signal and transmits the driving channel electrodes TX1 to TXm to the touch panel 21 by (x-axis direction). The touch system 200 of this embodiment may include a plurality of (y-axis direction) sensing channel electrodes RX1 to RXn, thereby collecting sensing signals from the touch panel 21. The touch system 200 of this embodiment may include a sensing circuit 23 that receives and processes the sensing signal to determine the touch position of the touch panel 21.

Similar to (first figure) self-capacitive touch system 100, in the touch system 200 (fourth figure) of this embodiment, the number of channel electrodes along each dimension (or coordinate axis) is less than the number of touch pixels in this dimension . In other words, in this embodiment, each (drive/sense) channel electrode can be mapped to more than one touch pixel of the same dimension.

According to another feature of this embodiment, the original sensing channel electrodes RX1~RXn are mirrored to form mirrored sensing channel electrodes RXn~RX1. Original sensing channel electrodes RX1~RXn and mirroring The sensing channel electrodes RXn~RX1 alternately correspond to the driving channel electrodes TX1~TXm. The fifth figure illustrates that the original sensing channel electrodes RX1 to RX12 and the mirror sensing channel electrodes RX12 to RX1 are alternately mapped to the driving channel electrodes TX1 to TX4. In another embodiment, the original drive channel electrodes TX1~TXm are mirrored to form mirror drive channel electrodes TXm~TX1. The original driving channel electrodes TX1~TXm and the mirror driving channel electrodes TXm~TX1 alternately correspond to the sensing channel electrodes RX1~RXn.

The above are only the preferred embodiments of the present invention and are not intended to limit the scope of the patent application of the present invention; all other equivalent changes or modifications made without departing from the spirit of the invention should be included in the following Within the scope of patent application.

100: Self-capacitance touch system

11: Touch panel

12: sensing circuit

RX1~RXn: channel electrode

RY1~RYm: channel electrode

Claims (11)

A touch system includes: a touch panel with a plurality of touch pixels, the touch panel including a plurality of channel electrodes; and a sensing circuit, through which the channel electrodes receive and process sensing signals from the touch panel ; Wherein the channel electrodes are mapped to the touch pixels such that the number of channel electrodes along each dimension is less than the number of touch pixels of the dimension; and each of the touch pixels along the dimension extends laterally to the same dimension At least one adjacent touch pixel. The touch system according to item 1 of the patent application scope, wherein, in addition to the terminal touch pixels, each of the touch pixels along the dimension extends laterally to the adjacent two-end touch pixels of the same dimension. The touch system according to item 1 of the patent application scope, wherein the touch pixels have an oblique shape, and each of the touch pixels along the dimension extends laterally to the left adjacent touch pixel except for the end touch pixels Touch pixels adjacent to the right. The touch system according to item 1 of the patent application scope, wherein the touch pixels have a zigzag shape, except for the end touch pixels, each of the touch pixels along the dimension extends laterally to the left adjacent touch pixel Touch pixels adjacent to the right. The touch system according to item 1 of the patent application scope, wherein the touch system includes a self-capacitance touch system. According to the touch system described in item 1 of the patent application scope, wherein each channel electrode of this dimension is mapped to more than one touch pixel. The touch system according to item 1 of the scope of the patent application further includes a display panel embedded in the inside or outside of the display panel to form a touch screen. A touch system includes: a touch panel with a plurality of touch pixels, the touch panel including a plurality of driving channel electrodes and a plurality of sensing channel electrodes; a driving circuit that generates a driving signal and uses the driving channel electrodes To transmit to the touch panel; and a sensing circuit to receive and process sensing signals from the touch panel through the sensing channel electrodes; wherein the channel electrodes are mapped to the touch pixels so that The number of channel electrodes in one dimension is smaller than the number of touch pixels in that dimension; and the original sensing channel electrodes along the dimension are mirrored to form a mirrored sensing channel electrode, and then the original sensing channel electrode and the mirrored sensing The measurement channel electrodes alternately correspond to the drive channel electrodes; or mirror along the original drive channel electrodes of this dimension to form mirror drive channel electrodes, and then the original drive channel electrodes and the mirror drive channel electrodes alternately correspond to the sensing Channel electrode. The touch system according to item 8 of the patent application scope, wherein the touch system includes a mutual capacitance touch system. The touch system according to item 8 of the patent application scope, wherein each driving or sensing channel electrode of this dimension is mapped to more than one touch pixel. The touch system according to item 8 of the patent application scope further includes a display panel, which is embedded inside or outside the display panel to form a touch screen.

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