CN111625111A - Touch control system - Google Patents
Touch control system Download PDFInfo
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- CN111625111A CN111625111A CN201910151469.8A CN201910151469A CN111625111A CN 111625111 A CN111625111 A CN 111625111A CN 201910151469 A CN201910151469 A CN 201910151469A CN 111625111 A CN111625111 A CN 111625111A
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- 238000000034 method Methods 0.000 claims description 5
- 238000013507 mapping Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 230000005686 electrostatic field Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
Abstract
A touch system includes a plurality of channel electrodes mapped to touch pixels such that the number of channel electrodes along each dimension is less than the number of touch pixels in that dimension. In one embodiment, each channel electrode at a different mapped touch pixel location has a different adjacent channel electrode. In another embodiment, each touch pixel along the dimension extends laterally to at least one adjacent touch pixel of the same dimension. In yet another embodiment, the primary and mirror sense channel electrodes alternately correspond to the drive channel electrodes.
Description
Technical Field
The present invention relates to a touch system, and more particularly, to a capacitive touch system with fewer channel electrodes.
Background
A touch screen is an input/output device that combines a touch panel (and its circuitry) with a display panel (e.g., a liquid crystal display panel). Touch screens allow a user to directly interact with the content shown by the display panel, and are widely used in electronic devices, such as smart phones, tablet computers, wearable devices, and the like.
Capacitive sensing is a popular one of many touch sensing technologies. When a human body touches the surface of the touch screen, the electrostatic field of the touch screen is changed, and the electrostatic field can be measured by changing the capacitance value.
As the resolution of the touch screen increases, more channels and their routing space are required. In addition, larger circuits are required to cope with more channels. Therefore, the active area of the touch screen is sacrificed and the performance and sensitivity are also affected.
Therefore, there is a need for a novel capacitive touch screen that does not sacrifice performance and sensitivity when resolution is increased.
Disclosure of Invention
In view of the foregoing, it is an object of the present invention to provide a capacitive touch system with fewer channel electrodes, enhanced accuracy and/or improved ghost touch problem.
According to one embodiment of the present invention, a self-capacitance touch system includes a touch panel and a sensing circuit. The touch panel comprises a plurality of touch pixels and a plurality of channel electrodes. The sensing circuit receives and processes a sensing signal from the touch panel through the plurality of channel electrodes. The plurality of channel electrodes are mapped to the plurality of touch pixels such that the number of channel electrodes along each dimension is less than the number of touch pixels in that dimension. Each channel electrode at different mapping touch pixel positions has different adjacent channel electrodes. 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 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 comprises 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 signals to the touch panel through the plurality of driving channel electrodes. The sensing circuit receives and processes sensing signals from the touch panel through the plurality of sensing channel electrodes. The plurality of channel electrodes are mapped to the plurality of touch pixels such that the number of channel electrodes along each dimension is less than the number of touch pixels in that dimension. And mirroring the original sensing channel electrode along the dimension to form a mirrored sensing channel electrode, and alternately corresponding the original sensing channel electrode and the mirrored sensing channel electrode to the driving channel electrode. Or, the original driving channel electrode along the dimension is mirrored to form a mirrored driving channel electrode, and then the original driving channel electrode and the mirrored driving channel electrode are alternately corresponding to the sensing channel electrode.
Drawings
Fig. 1 shows a block diagram of a self-capacitance touch system according to an embodiment of the invention, which is applicable to a touch screen.
FIG. 2 illustrates 24 channel electrodes RX 1-RX 24 mapped to 48 touch pixels of the same dimension.
FIG. 3A shows a top view of a pattern of touch pixels along an exemplary dimension in accordance with an embodiment of the invention.
FIG. 3B shows a top view of a pattern of touch pixels along an exemplary dimension in accordance with another embodiment of the present invention.
Fig. 4 shows a block diagram of a mutual capacitance touch system according to another embodiment of the present invention, which is applicable to a touch screen.
FIG. 5 illustrates that the original channel electrodes RX 1-RX 12 and the mirror channel electrodes RX 12-RX 1 are alternatively mapped to the driving channel electrodes TX 1-TX 4.
Wherein the reference numerals are as follows:
100: self-capacitance touch system
11: touch panel
12: sensing circuit
200: mutual capacitance touch system
21: touch panel
22: driving circuit
23: sensing circuit
RX 1-RXn: channel electrode/sensing channel electrode
RY 1-RYm: channel electrode
TX1 TXm: drive channel electrode
RX1 to RX 24: channel electrode
P1-P5: touch pixel
Detailed Description
Fig. 1 shows a block diagram of a self-capacitance (self-capacitance) touch system 100 according to an embodiment of the invention, which is applicable to a touch screen. In the present embodiment, the self-capacitance touch system (touch system for short) 100 may include a touch panel 11, which may be embedded inside or outside a display panel (e.g., a liquid crystal display panel). Generally, the touch panel 11 with the touch pixel resolution pxq may include p rows and q columns of touch pixels.
The touch system 100 of the present embodiment can include a plurality of (y-axis direction) channel electrodes RX 1-RXn and (x-axis direction) channel electrodes RY 1-RYm for collecting sensing signals from the touch panel 11. The touch system 100 of the present embodiment may include a sensing circuit 12, which receives and processes the sensing signal to determine the touch position of the touch panel 11.
According to one feature of this embodiment, the number of channel electrodes along each dimension (or coordinate axis) is less than the number of touch pixels in that dimension. In other words, in the present embodiment, each channel electrode can be mapped (map) or connected to more than one touch pixel of the same dimension.
FIG. 2 illustrates 24 channel electrodes RX 1-RX 24 mapped to 48 touch pixels of the same dimension. The channel electrodes RX 1-RX 24 are mapped to the front 24 touch pixels in a first order (order), and the channel electrodes RX 1-RX 24 are mapped to the rear 24 touch pixels in a second order (different from the first order). In the present embodiment, as shown in the second sequence illustrated in fig. 2, the channel electrodes RX 1-RX 24 are sequentially allocated to a plurality of (e.g., three) groups. Thereby, the first channel electrode RX1 is allocated to the first group, the second channel electrode RX2 is allocated to the second group, the third channel electrode RX3 is allocated to the third group, the fourth channel electrode RX4 is allocated to the first group, the fifth channel electrode RX5 is allocated to the second group, the sixth channel electrode RX6 is allocated to the third group, and so on. In other words, if r groups are shared, every other r channel electrodes are assigned to the same group.
According to another feature of this embodiment, each channel electrode at different mapping touch pixel locations has different adjacent channel electrodes (combinations). As illustrated in fig. 2, the channel electrodes RX2 at the left-hand image touch pixel location have their adjacent channel electrodes RX1 and RX3, while the channel electrodes RX2 at the right-hand image touch pixel location have their adjacent channel electrodes RX22 and RX 5. Since the sensing signals of different channel electrode combinations are different, the touch position of the touch panel 11 can be correctly determined without the ghost (ghost) touch problem.
FIG. 3A is a top view of a pattern of touch pixels R1-P5 along an exemplary dimension (or coordinate axis) according to an embodiment of the invention. According to yet another feature of the present embodiment, each touch pixel along each dimension may extend laterally to adjacent touch pixel(s) of the same dimension. As illustrated in FIG. 3A, the touch pixels P1-P5 have a slanted shape. Taking the second touch pixel P2 as an example, it extends laterally to the (left) first touch pixel P1 and the (right) third touch pixel P3. Since each touch pixel includes not only the information of its own touch pixel position but also the information of the adjacent touch pixel position, the touch position of the touch panel 11 can be correctly determined with higher accuracy. The pattern of the touch pixels of the present embodiment is not limited to the one illustrated in fig. 3A, and may be modified according to a specific application. FIG. 3B is a top view of another embodiment of the invention showing a pattern of touch pixels R1-P5 along an exemplary dimension (or coordinate axis). As illustrated in FIG. 3B, the touch pixels P1-P5 have a sawtooth (joinsawn) shape. Taking the second touch pixel P2 as an example, it extends laterally to the (left) first touch pixel P1 and the (right) third touch pixel P3.
Fig. 4 shows a block diagram of a mutual-capacitance (mutual-capacitance) touch system 200 according to another embodiment of the invention, which is applicable to a touch screen. In the present embodiment, the mutual capacitance touch system (touch system for short) 200 may include a touch panel 21, which may be embedded inside or outside a display panel (e.g., a liquid crystal display panel). Generally, the touch panel 21 with the touch pixel resolution pxq may include p rows and q columns of touch pixels.
The touch system 200 of the present embodiment can include a driving circuit 22 for generating a driving signal and transmitting the driving signal to the touch panel 21 via the driving channel electrodes TX1 TXm (in the x-axis direction). The touch system 200 of the present embodiment may include a plurality of (y-axis direction) sensor channel electrodes RX 1-RXn for collecting sensor signals from the touch panel 21. The touch system 200 of the present embodiment may include a sensing circuit 23, which receives and processes the sensing signal to determine the touch position of the touch panel 21.
Similar to the self-capacitance touch system 100 (fig. 1), in the touch system 200 (fig. 4) of the present embodiment, the number of channel electrodes along each dimension (or coordinate axis) is less than the number of touch pixels of the dimension. In other words, in the present embodiment, each (driving/sensing) channel electrode can be mapped to more than one touch pixel of the same dimension.
According to another feature of this embodiment, the raw sense channel electrodes RX 1-RXn are mirrored (mirror) to form mirrored sense channel electrodes RXn-RX 1. The original sensing channel electrodes RX 1-RXn alternate with the mirrored sensing channel electrodes RXn-RX 1 (alternativelyy) to the driving channel electrodes TX 1-TXm. FIG. 5 illustrates that the original sensor channel electrodes RX 1-RX 12 and the mirror sensor channel electrodes RX 12-RX 1 are alternately mapped to the driving channel electrodes TX 1-TX 4. In another embodiment, the original drive channel electrodes TX1 TXM are mirrored to form mirrored drive channel electrodes TXM TX 1. The original driving channel electrodes TX 1-TXm and the mirror driving channel electrodes TXm-TX 1 alternately correspond to the sensing channel electrodes RX 1-RXn.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the claims of the present invention; it is intended that all such equivalent changes and modifications be included within the scope of the present disclosure as defined by the appended claims.
Claims (15)
1. A touch system, comprising:
the touch panel is provided with a plurality of touch pixels and comprises a plurality of channel electrodes; and
a sensing circuit for receiving and processing sensing signals from the touch panel through the plurality of channel electrodes;
wherein the plurality of channel electrodes are mapped to the plurality of touch pixels such that the number of channel electrodes along each dimension is less than the number of touch pixels for that dimension; and
wherein each channel electrode at different mapping touch pixel positions has different adjacent channel electrodes.
2. The touch system of claim 1, wherein the touch system comprises a self-capacitance touch system.
3. The touch system of claim 1, wherein each channel electrode of the dimension is mapped to more than one touch pixel.
4. The touch system of claim 1, further comprising a display panel embedded inside or outside the display panel to form a touch screen.
5. A touch system, comprising:
the touch panel is provided with a plurality of touch pixels and comprises a plurality of channel electrodes; and
a sensing circuit for receiving and processing sensing signals from the touch panel through the plurality of channel electrodes;
wherein the plurality of channel electrodes are mapped to the plurality of touch pixels such that the number of channel electrodes along each dimension is less than the number of touch pixels for that dimension; and
wherein each of the touch pixels along the dimension extends laterally to at least one adjacent touch pixel of the same dimension.
6. The touch system of claim 5, wherein each of the touch pixels along the dimension extends laterally to two adjacent end touch pixels of the same dimension except for an end touch pixel.
7. The touch system of claim 5, wherein the touch pixels have a slanted shape, except for a terminal touch pixel, and each of the touch pixels along the dimension extends laterally to a left adjacent touch pixel and a right adjacent touch pixel.
8. The touch system of claim 5, wherein the touch pixels have a saw-tooth shape, except for a terminal touch pixel, and each of the touch pixels along the dimension extends laterally to a left adjacent touch pixel and a right adjacent touch pixel.
9. The touch system of claim 5, wherein the touch system comprises a self-capacitance touch system.
10. The touch system of claim 5, wherein each channel electrode of the dimension is mapped to more than one touch pixel.
11. The touch system of claim 5, further comprising a display panel embedded inside or outside the display panel to form a touch screen.
12. A touch system, comprising:
the touch panel is provided with a plurality of touch pixels and comprises a plurality of driving channel electrodes and a plurality of sensing channel electrodes;
a driving circuit for generating driving signals and transmitting the driving signals to the touch panel through the plurality of driving channel electrodes; and
the sensing circuit receives and processes sensing signals from the touch panel through the sensing channel electrodes;
wherein the plurality of channel electrodes are mapped to the plurality of touch pixels such that the number of channel electrodes along each dimension is less than the number of touch pixels for that dimension; and
wherein the original sensing channel electrode along the dimension is mirrored to form a mirrored sensing channel electrode, and then the original sensing channel electrode and the mirrored sensing channel electrode are alternately corresponded to the driving channel electrode; or the original driving channel electrode along the dimension is mirrored to form a mirrored driving channel electrode, and then the original driving channel electrode and the mirrored driving channel electrode are alternately corresponding to the sensing channel electrode.
13. The touch system of claim 12, wherein the touch system comprises a mutual capacitance touch system.
14. The touch system of claim 12, wherein each drive or sense channel electrode of the dimension is mapped to more than one touch pixel.
15. The touch system of claim 12, further comprising a display panel embedded inside or outside the display panel to form a touch screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910151469.8A CN111625111A (en) | 2019-02-28 | 2019-02-28 | Touch control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910151469.8A CN111625111A (en) | 2019-02-28 | 2019-02-28 | Touch control system |
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| Publication Number | Publication Date |
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| CN111625111A true CN111625111A (en) | 2020-09-04 |
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| CN201910151469.8A Pending CN111625111A (en) | 2019-02-28 | 2019-02-28 | Touch control system |
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Citations (7)
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| CN101930143A (en) * | 2009-06-24 | 2010-12-29 | 上海天马微电子有限公司 | Electronic ink display panel and forming method thereof |
| US20130329347A1 (en) * | 2012-06-07 | 2013-12-12 | Mstar Semiconductor, Inc. | Touch panel |
| US20170090673A1 (en) * | 2015-09-30 | 2017-03-30 | Lg Display Co., Ltd. | Display device and method for driving the same |
| US20170108965A1 (en) * | 2015-10-15 | 2017-04-20 | Samsung Display Co., Ltd. | Touch sensing unit, touch screen panel having the same, and method of driving the touch screen panel |
| CN106959780A (en) * | 2017-03-29 | 2017-07-18 | 上海天马有机发光显示技术有限公司 | Touch-control display panel and touch control display apparatus |
| CN107797691A (en) * | 2016-09-02 | 2018-03-13 | 群创光电股份有限公司 | Touch control display apparatus |
| US20180120998A1 (en) * | 2016-10-31 | 2018-05-03 | Lg Display Co., Ltd. | Flexible touch panel and organic light emitting display device using the same |
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2019
- 2019-02-28 CN CN201910151469.8A patent/CN111625111A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101930143A (en) * | 2009-06-24 | 2010-12-29 | 上海天马微电子有限公司 | Electronic ink display panel and forming method thereof |
| US20130329347A1 (en) * | 2012-06-07 | 2013-12-12 | Mstar Semiconductor, Inc. | Touch panel |
| CN103488326A (en) * | 2012-06-07 | 2014-01-01 | 晨星软件研发(深圳)有限公司 | Touch panel |
| US20170090673A1 (en) * | 2015-09-30 | 2017-03-30 | Lg Display Co., Ltd. | Display device and method for driving the same |
| CN106557199A (en) * | 2015-09-30 | 2017-04-05 | 乐金显示有限公司 | Display device and its driving method |
| US20170108965A1 (en) * | 2015-10-15 | 2017-04-20 | Samsung Display Co., Ltd. | Touch sensing unit, touch screen panel having the same, and method of driving the touch screen panel |
| CN107797691A (en) * | 2016-09-02 | 2018-03-13 | 群创光电股份有限公司 | Touch control display apparatus |
| US20180120998A1 (en) * | 2016-10-31 | 2018-05-03 | Lg Display Co., Ltd. | Flexible touch panel and organic light emitting display device using the same |
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Application publication date: 20200904 |