CN109324717B - Touch display device and touch driving method - Google Patents
Touch display device and touch driving method Download PDFInfo
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- CN109324717B CN109324717B CN201811586680.4A CN201811586680A CN109324717B CN 109324717 B CN109324717 B CN 109324717B CN 201811586680 A CN201811586680 A CN 201811586680A CN 109324717 B CN109324717 B CN 109324717B
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000005192 partition Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
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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
- G06F3/0412—Digitisers structurally integrated in a display
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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
Abstract
A touch display device and a touch driving method are provided, the touch driving method includes: detecting a synchronization signal from a display driving system; detecting an interference signal from the touch display panel, wherein the interference signal comprises a plurality of interference pulses; generating a plurality of trigger pulses within a fixed period of the synchronization signal according to the synchronization signal and the plurality of interference pulses; and generating a plurality of touch driving pulses according to the plurality of trigger pulses.
Description
Technical Field
The present disclosure relates to a touch driving method, and more particularly, to a touch driving method with noise immunity.
Background
With the development of touch display devices, liquid crystal display panels for displaying images and touch panels for sensing touch are often integrated in manufacturing.
However, due to the integration of the liquid crystal display panel and the touch panel, the noise generated when the liquid crystal display panel displays the specific pattern may affect the touch signal of the touch panel.
Therefore, how to protect the touch panel from noise from the lcd panel is a big issue today.
Disclosure of Invention
One aspect of the present disclosure is to provide a touch driving method including: detecting a synchronization signal from a display driving system; detecting an interference signal from the touch display panel, wherein the interference signal comprises a plurality of interference pulses; generating a plurality of trigger pulses within a fixed period of the synchronization signal according to the synchronization signal and the plurality of interference pulses; and generating a plurality of touch driving pulses according to the plurality of trigger pulses.
Another aspect of the present disclosure is to provide a touch display device, which includes a touch display panel, a display driving circuit, a timing control unit, a touch driving unit, and a touch control unit. The timing control unit is used for providing a synchronous signal to the display driving circuit. The touch control unit is coupled to the timing control unit, and is used for executing the following steps: detecting the synchronization signal; detecting an interference signal from the touch display panel, wherein the interference signal comprises a plurality of interference pulses; estimating a delay time, which is a time interval corresponding to the synchronization signal and one of the plurality of interference pulses; generating a plurality of trigger pulses within a fixed period of the synchronization signal according to the synchronization signal and the delay time; and outputting a plurality of touch driving pulses corresponding to the plurality of trigger pulses to the touch display panel. The touch driving unit is coupled to the touch control unit and is used for generating the touch driving pulses according to the trigger pulses.
Through the arrangement, the touch operation can be prevented from being influenced by noise from the display panel while the display panel and the touch panel are integrated.
This disclosure is intended to provide a simplified summary of the disclosure in order to provide the reader with a basic understanding of the disclosure, and is not intended to identify key elements of embodiments of the disclosure or to delineate the scope of the disclosure.
Drawings
In order to make the aforementioned and other objects, features, and advantages of the invention, as well as others which will become apparent, reference is made to the following description of the preferred embodiments of the invention in which:
fig. 1 is a block schematic diagram illustrating a touch display device according to an embodiment of the present disclosure;
FIG. 2 is a functional block diagram of a touch display device according to an embodiment of the present disclosure;
fig. 3 is a flowchart illustrating a touch driving method of the touch display device in fig. 1 according to an embodiment of the present disclosure;
FIG. 4 is a partial flow diagram illustrating the touch driving method of FIG. 3 according to one embodiment of the present disclosure;
FIG. 5 is a timing diagram illustrating the touch driving method of FIG. 4 according to an embodiment of the disclosure;
FIG. 6 is a partial flow diagram illustrating the touch driving method of FIG. 3 according to one embodiment of the present disclosure; and
fig. 7 is an explanatory example of the touch driving method shown in fig. 6 according to an embodiment of the present disclosure.
Wherein the reference numerals are as follows:
100: touch control display device
110: touch control unit
120: touch control driving unit
130: time sequence control unit
140: touch control display panel
150: display driving circuit
300: touch driving method
Stou: touch driving signal
Ssync: synchronization signal
Stri: trigger signal
Sn: interference signal
Sd: data enable signal
Ssync, P11, P12, P13: synchronization pulse
Ptou, P411, P421, P431, P432, P433: touch drive pulse
Ptri, P311, P321, P331, P332, P333: trigger pulse
Pn, P211, P212, P213, P221, P222, P223, P231, P232, P233: interference pulse
L1, L11, L12, L13: length of noiseless interval
L2: pulse length
d. d1, d2, d 3: delay time
TP1, TP 2: period of time
S310-S340, S410-S470, S610-S640: step (ii) of
Detailed Description
The following embodiments are described in detail with reference to the accompanying drawings, but the embodiments are not provided to limit the scope of the disclosure, and the description of the structure operation is not intended to limit the execution sequence thereof, and any structure resulting from the rearrangement of elements to produce an apparatus with equivalent technical effect is included in the scope of the disclosure. In addition, the drawings are for illustrative purposes only and are not drawn to scale. For ease of understanding, the same or similar elements will be described with the same reference numerals in the following description.
As used herein, the terms "first," "second," …, etc., are not intended to be limited to the exact order or sequence presented, nor are they intended to be limiting, but rather are intended to distinguish one element from another or from another element or operation described by the same technical term.
As used herein, to "couple" or "connect" may mean that two or more elements are in direct physical or electrical contact with each other, or in indirect physical or electrical contact with each other, and "couple" or "connect" may also mean that two or more elements are in operation or act with each other.
Fig. 1 is a schematic diagram illustrating a touch display device 100 according to an embodiment of the disclosure. As shown in fig. 1, the touch display device 100 includes a touch control unit 110, a touch driving unit 120, a timing control unit 130, a touch display panel 140 and a display driving circuit 150, wherein the touch control unit 110 is coupled to the touch driving unit 120 and the timing control unit 130, the touch driving unit 120 is further coupled to the timing control unit 130 and the touch display panel 140, the timing control unit 130 is further coupled to the display driving circuit 150, and the touch display panel 140 is further coupled to the display driving circuit 150.
In some embodiments, the touch display panel 140 includes a touch panel and a display panel, wherein the display panel is used for displaying an image frame, and the touch panel is used for generating a voltage change according to a touch position to realize a touch operation. In some embodiments, the touch display panel 140 may be a touch display panel with an in-cell (in-cell) touch panel, that is, a touch device is integrated in the display panel to implement a touch operation and a frame display operation through a timing control. In some embodiments, the touch device of the in-cell touch panel is disposed on an array substrate (array substrate) in the display panel.
In some embodiments, the touch driving unit 120 is configured to generate a plurality of touch driving pulses Ptou and transmit the plurality of touch driving pulses to the touch display panel 140 to determine whether the touch display panel 140 is touched by a conductor. In some embodiments, the Touch driving unit 120 may be implemented as a Touch chip (Touch IC). In some embodiments, the touch control unit 110, the touch driving unit 120 and the timing control unit 130 may be implemented as an integrated chip.
In some embodiments, the timing control unit 130 is used to control the operations of the touch driving unit 120 and the display driving circuit 150. In some embodiments, the Timing control unit 130 may be implemented as a Timing controller (Timing controller).
In some embodiments, the display driving circuit 150 is configured to drive the touch display panel 140 to generate a corresponding frame. In some embodiments, the display driving circuit 150 may be implemented as a source driver (source driver) and a gate driver (gate driver) disposed on one or both sides of the touch display panel 140. In another embodiment, the display driving circuit 150 may be implemented as a source driver disposed at one side of the touch display panel 140. The gate driver may be disposed on the array substrate around the touch display panel 140.
In some embodiments, the touch control unit 110 is configured to detect a synchronization signal from the timing control unit 130, detect an interference signal from the touch display panel 140, estimate a delay time corresponding to the synchronization signal and the interference signal, generate a plurality of trigger pulses (trigger) in a fixed period of the synchronization signal according to the synchronization signal and the delay time, and output a plurality of touch driving pulses Ptou corresponding to the plurality of trigger pulses to the touch display panel 140.
In some embodiments, signal transmission between various components of the touch display device 100 shown in fig. 1 is as shown in fig. 2, and fig. 2 is a functional block diagram of the touch display device 100 according to an embodiment of the disclosure.
As shown in fig. 2, in some embodiments, each row of the touch display panel 140 includes a red pixel (R), a green pixel (G), and a blue pixel (B), each row of pixels is alternately connected to a high voltage level and a low voltage level in sequence, and two adjacent pixels of each row of pixels are respectively connected to the high voltage level and the low voltage level. In other words, the pixel arrangement (pixel arrangement) of the touch display panel 140 includes a Tri-gate (Tri-gate) pixel structure, a Column inversion (Column inversion) configuration, and a Zigzag (Zigzag) pixel layout.
As shown in fig. 2, when the pixels in the vertical row direction displayed on the touch display panel 140 have the same color, that is, when the touch display panel 140 displays a vertical stripe (V-stripe) pattern, the touch display panel 140 generates the largest noise, which greatly affects the transmission and reception of the touch signal, however, any pattern displayed on the touch display panel 140 generates noise with different amplitudes, and thus, various patterns are within the scope of the present disclosure.
As shown in FIG. 2, each row of pixels in the touch display panel 140 is respectively connected to the gate lines G1-G6, and each column of pixels in the touch display panel 140 is respectively connected to the signal lines S1-S7.
As shown in fig. 2, the timing control unit 130 provides a synchronization signal Ssnyc to the touch control unit 110 and the touch driving unit 120, wherein the synchronization signal Ssync includes a horizontal synchronization signal (Hsync) and a vertical synchronization signal (Vsync). In the following embodiments, the horizontal synchronization signal Hsync is taken as an example for illustration.
As shown in fig. 2, the display driving circuit 150 is disposed at two sides of the touch display panel 140 for providing a driving display signal to the touch display panel 140, so that the touch display panel 140 displays a corresponding image frame.
In some embodiments, the touch driving unit 120 is configured to generate a touch driving pulse Ptou to the touch input driving terminal TX of the touch display panel 140, and receive a signal from the touch input sensing terminal RX of the touch display panel 140 through the touch driving unit 120.
In some embodiments, the touch control unit 110 is configured to detect a synchronization signal Ssync from the timing control unit 130; detecting an interference signal Sn from the touch driving unit 120; the delay time d required for touch is detected, and a plurality of trigger pulses Ptri are generated according to the interference signal Sn and the delay time d and output to the touch driving unit 120.
Detailed implementation methods of the present disclosure are described in the following paragraphs with reference to the touch driving method in fig. 3, where fig. 3 is a flowchart illustrating the touch driving method 300 of the touch display device 100 in fig. 1 according to an embodiment of the present disclosure. However, the present disclosure is not limited to the following examples.
It is noted that the touch driving method 300 can be applied to the touch display device 100 having the same or similar structure as that shown in fig. 1. For simplicity, the touch display device 100 in fig. 1 is taken as an example to describe the operation method according to an embodiment of the invention, but the invention is not limited to this application.
Referring to fig. 2 and 3 together, the touch driving method 300 includes the following steps.
In step S310, the touch control unit 110 detects a synchronization signal Ssync from the timing control unit 130.
In step S320, the touch driving unit 120 detects an interference signal Sn from the touch display panel 140 and transmits the interference signal Sn to the touch control unit 110, wherein the interference signal Sn includes a plurality of interference pulses Pn. In some embodiments, the interference signal Sn may be obtained by analyzing a signal from the touch input sensing terminal RX of the touch display panel 140.
In step S330, the touch control unit 110 generates a plurality of trigger pulses Ptri within a fixed period of the synchronization signal Ssync according to the synchronization signal Ssync and the plurality of interference pulses Pn, and transmits the trigger pulses Ptri to the touch driving unit 120.
In step S340, the touch driving unit 120 generates a plurality of touch driving pulses Ptou according to the plurality of trigger pulses Ptri and transmits the touch driving pulses Ptou to the touch display panel 140 to control the touch time.
See also fig. 4 and 5. Fig. 4 is a flowchart illustrating further details of the touch driving method 300 in fig. 3 according to some embodiments of the disclosure, wherein step S320 in fig. 3 includes step S410, and step S330 further includes steps S420 to S460. Fig. 5 is a timing diagram illustrating the touch driving method 300 in fig. 4 according to an embodiment of the disclosure
In step S410, the touch driving unit 120 detects whether the interference signal Sn exists at the touch input sensing terminal RX of the touch driving unit 120. In this step, the interference signal Sn can be analyzed by detecting the change of the signal of the touch input sensing terminal RX, and the touch driving unit 120 further transmits the interference signal Sn to the touch control unit 110.
In some embodiments, if the touch control unit 110 determines that the interference signal Sn exists at the touch input sensing terminal RX of the touch driving unit 120, step S420 is executed. If the touch control unit 110 determines that the touch input sensing terminal RX of the touch driving unit 120 does not have the interference signal Sn, step S470 is executed, in which the touch control unit 110 generates a trigger pulse Ptri according to the synchronization signal Ssync, and the touch driving unit 120 generates a touch driving pulse Ptou according to the trigger pulse Ptri.
In step S420, a delay time is set, in some embodiments, the delay time set in step S420 is an initial delay time d1 (as shown in fig. 5), for example, the initial delay time d1 may be set to 1ms in step S420.
In step S430, the touch control unit 110 generates a trigger pulse P311 according to the synchronization pulse Ssync and the initial delay d 1. In fig. 5, the trigger pulse P311 starts with the synchronization pulse P11 plus the delay time d 1. And step S430 generates a touch driving pulse P411 corresponding to the trigger pulse P311. In this embodiment, the starting point of the touch driving pulse P411 is determined by the time point of the trigger pulse P311, and the duration of the touch driving pulse P411 is determined by the time length required by the touch driving unit 120 to complete one touch detection. If the time required for the touch driving unit 120 to complete one touch detection is shorter, the duration of the touch driving pulse P411 is shorter.
In step S440, the touch control unit 110 detects whether the duration of the touch driving pulse P411 is affected by the interference signal Sn. If the touch control unit 110 determines that the touch driving pulse P411 is affected by the interference signal Sn, as shown in fig. 5, the touch control unit 110 determines that the touch driving pulse P411 is affected by the interference pulse P211 of the interference signal Sn, then step S450 is executed to calculate a new delay time d, and accordingly generate another trigger pulse Ptri and a corresponding touch driving pulse Ptou. In one embodiment, the new delay time d is calculated by incrementing the delay time, i.e., the new delay time d2 is the previous delay time d1 plus a certain time difference. For example, the current delay time d1(1ms) plus a certain time difference (1ms) may be equal to the new delay time d2(2ms), and it should be specifically noted that the values of the delay time d1, the delay time d2 and the time difference are only for convenience of illustration, and the disclosure is not limited to the above time values, and the values of the delay time may be adjusted according to the requirements of the practical application.
After the new delay time d2 is calculated, step S450 generates a new touch driving pulse P321 when the next sync pulse P12 arrives according to the new delay time d2, the starting time of the touch driving pulse P321 is the sync pulse P12 plus the delay time d2, and step S450 generates a touch driving pulse P421 corresponding to the touch driving pulse P321, as shown in fig. 4 and 5, in this embodiment, the starting point of the touch driving pulse P421 is determined by the time of the trigger pulse P321, and the duration of the touch driving pulse P421 is determined by the time length required by the touch driving unit 120 to complete one touch detection. At this time, step S440 is executed again to determine whether the touch driving pulse P421 is interfered by the interference signal Sn.
Taking fig. 5 as an example, if the touch control unit 110 determines that the touch driving pulse P421 is still affected by the interference pulse P221 of the interference signal Sn, step S450 is executed again to calculate a new delay time d again, and generate another trigger pulse Ptri and a corresponding touch driving pulse Ptou accordingly. At this time, the new delay time d3 calculated in step S450 may be the previous delay time d2 plus a certain time difference, for example, the current delay time d2(2ms) plus a certain time difference (1ms) may be equal to the new delay time d3(3 ms). After calculating the new delay time d3, step S450 generates a new touch driving pulse P331 when the next synchronization pulse P13 arrives according to the new delay time d3, the start time of the touch driving pulse P331 is the synchronization pulse P13 plus the delay time d3, and step S450 generates a touch driving pulse P431 corresponding to the touch driving pulse P331.
As shown in fig. 4 and 5. At this time, step S440 is executed again to determine whether the touch driving pulse P431 is interfered by the interference signal Sn. At this time, the touch control unit 110 determines that the interference signal Sn is not affected during the touch driving pulse P431, and as illustrated in fig. 5, the touch control unit 110 determines that the interference signal Sn is not affected during the touch driving pulse P431 by the interference pulses P231 and P232 or other interference pulses, and then performs step S460.
In some embodiments, in step S460, the touch control unit 110 generates the continuous trigger pulse Ptri according to the time point of the trigger pulse Ptri and the length of the equal interval of the fixed period TP1 of the synchronization signal Ssync. As shown in fig. 5, the touch control unit 110 divides the fixed period TP1 into three equal intervals, and thus generates three trigger pulses P331, P332, and P333. The trigger pulses P331, P332 and P333 are spaced apart from each other by one third of a fixed period TP 1.
The length of the equal partition interval can be regarded as three equal partitions of the fixed period TP1 (i.e., one third of the fixed period TP 1) of the synchronization signal Ssync. In another embodiment, the data start signal Sd may be equally divided according to the fixed period, that is, the length of the equally divided sections between the trigger pulses P331, P332, and P333 may be set to be one third of the fixed period TP2 of the data start signal Sd.
In this way, the touch control unit 110 transmits the trigger pulses P331, P332, and P333 to the touch driving unit 120, and the touch driving unit 120 generates the touch pulses P431, P432, and P433 according to the trigger pulses P331, P332, and P333, so that the time period when the touch display device 100 receives the touch driving signal Stou is not affected by the noise generated by displaying the specific pattern.
In the above embodiments, the touch control unit 110 generates three sets of trigger pulses P331, P332, and P333 for illustration, but the disclosure is not limited thereto. In other embodiments, in order to further increase the reporting rate of the touch control unit 110 (i.e. shorten the scanning interval), the number of times of the trigger pulse may be increased (for example, more than four times), so long as the noise on the driving signal Stou can be avoided, and the reporting rate of the touch control unit 110 can be further increased while avoiding the influence of the noise. In other embodiments, if the touch control unit 110 does not need high return rate, only one or two trigger pulses may be generated during the fixed period TP1 of the synchronization signal Ssync.
Fig. 6 is a flow chart illustrating further details of the touch driving method 300 of fig. 3 according to some embodiments of the disclosure, wherein the difference between the driving method 300 of fig. 6 and the driving method 300 of fig. 4 is that step S330 of fig. 6 includes steps S610 to S670.
Since steps S310, S410, S420, S340 and S470 shown in fig. 6 have already been described in fig. 3 and 4, they are not described herein again.
Reference is made to fig. 6 and 7 together, where fig. 7 is an illustrative example of the touch driving method 300 in fig. 6 according to an embodiment of the disclosure.
In step S620, a delay time is set, and in some embodiments, the delay time set in step S620 is an initial delay time d1 (as shown in fig. 7), for example, the initial delay time d1 may be set to 1ms in step S620.
In step S630, the touch control unit 110 generates a trigger pulse P311 according to the synchronization pulse P11 and the initial delay time d 1. In fig. 5, the trigger pulse P311 starts with the synchronization pulse P11 plus the delay time d 1.
In step S640, the touch control unit 110 estimates a length L11 of a noise-free interval (or a low-noise interval) from the start point of the trigger pulse P311 to any one of the following interference pulses Pn (in the embodiment of fig. 7, the interference pulse P211).
Next, in step S650, the touch control unit 110 determines whether the length L11 of the noise-free interval (or the low-noise interval) of the trigger pulse P311 is greater than the pulse length L2 of the touch driving pulse P411.
At this time, the length L11 of the noise-free interval (or low-noise interval) of the trigger pulse P311 is not greater than the pulse length L2 of the touch driving pulse P411.
Therefore, in step S660, the touch control unit 110 calculates a new delay time d2 and generates another corresponding trigger pulse P321 according to the new delay time d2, and the details of this step can refer to step S450 in the implementation of fig. 4.
Continuing to step S640, the touch control unit 110 estimates a length L12 of a noise-free interval (or a low-noise interval) from the start point of the trigger pulse P321 to any one of the following interference pulses Pn (in the embodiment of fig. 7, the interference pulse P221). In step S650, the touch control unit 110 determines that the length L12 of the noise-free interval (or low-noise interval) of the trigger pulse P321 is still smaller than the pulse length L2 of the touch driving pulse P421, so that step S660 is executed again, the touch control unit 110 calculates a delay time d3 different from the delay time d2, generates another trigger pulse P331 corresponding to the synchronization pulse P13 according to the delay time d3, and continues to execute step S640.
In step S640, the touch control unit 110 estimates a length L13 of a noise-free interval (or a low-noise interval) from the start point of the trigger pulse P331 to any one of the following interference pulses Pn (in the embodiment of fig. 7, the interference pulse P232).
In step S650, the touch control unit 110 determines that the length L13 of the noise-free interval (or low-noise interval) of the trigger pulse P331 is greater than the pulse length L2 of the touch driving pulse P431, and then step S670 is executed, where as shown in fig. 7, the touch control unit 110 determines that the length L13 of the noise-free interval is greater than the pulse length L2, and further controls the touch driving unit 120 to generate the touch driving pulse P431 in the noise-free interval (or low-noise interval), and continues to generate the touch driving pulses P432 and P433, so that the time period during which the touch display device 100 receives the touch driving signal Stou is not affected by the noise generated when the specific pattern is displayed.
It should be noted that the pulse length L2 may refer to the shortest pulse duration required by the touch driving pulse Ptou generated by the touch driving unit 120. If the duration of the touch driving pulse Ptou is less than the pulse length L2, the touch input sensing terminal RX of the touch display panel 140 cannot correctly sense whether there is a touch input or the correct position of the touch input. In one embodiment, the pulse length L2 may be determined according to the size of the touch display panel 140, the touch input resolution, or the touch input update frequency.
In summary, through the above arrangement, the present disclosure can prevent noise generated by displaying the specific pattern from affecting the touch operation when the touch display device 100 displays the specific pattern.
Although the present disclosure has been described with reference to the above embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention, and therefore, the scope of the invention is to be determined by the appended claims.
Claims (11)
1. A touch driving method includes:
detecting a synchronization signal from a touch display device;
detecting an interference signal from the touch display device, wherein the interference signal comprises a plurality of interference pulses;
estimating a delay time corresponding to a time interval between the synchronization signal and one of the interference pulses;
generating a plurality of trigger pulses within a fixed period of the synchronization signal according to the synchronization signal and the delay time; and
and generating a plurality of touch driving pulses according to the trigger pulse.
2. The touch driving method according to claim 1, wherein the step of detecting the interference signal from the touch display device comprises:
detecting whether the interference signal exists at a touch input sensing end of a touch driving unit of the touch display device.
3. The touch driving method according to claim 1, wherein the synchronization signal comprises a first synchronization pulse and a second synchronization pulse, the first synchronization pulse and the second synchronization pulse are separated from each other by the fixed period of the synchronization signal, and the step of generating the trigger pulse according to the synchronization signal and the interference pulse comprises:
estimating a first delay time from the first synchronization pulse to any of the interference pulses; and
and generating a first trigger pulse of the trigger pulses according to the time point of the first synchronous pulse plus the first delay time.
4. The touch driving method according to claim 3, wherein the touch driving method generates a first touch driving pulse according to the first trigger pulse, and further comprising:
detecting whether the first touch driving pulse is influenced by the interference signal or not; and
if the period of the first touch driving pulse is affected by the interference signal, calculating a second delay time different from the first delay time, and generating another trigger pulse corresponding to the second synchronization pulse according to the second delay time.
5. The touch driving method according to claim 4, further comprising:
if the period of the first touch driving pulse is not affected by the interference signal, a second trigger pulse and a third trigger pulse of the trigger pulses are generated according to the time point of the first trigger pulse and an equal interval length of the fixed period.
6. The touch driving method according to claim 3, wherein the step of generating the trigger pulse according to the synchronization signal and the interference pulse comprises:
according to the time point of the first trigger pulse and an equal interval length of a switching period of a data start signal, a second trigger pulse and a third trigger pulse of the trigger pulses are generated.
7. The touch driving method according to claim 3, wherein the touch driving method generates a first touch driving pulse according to the first trigger pulse, and further comprising:
estimating a length of a noise-free interval from a starting point of the first trigger pulse to any one of the interference pulses;
judging whether the length of the noise-free interval is greater than the pulse length of the first touch drive pulse; and
if the length of the noise-free interval is smaller than the pulse length of the first touch driving pulse, calculating a second delay time different from the first delay time, and generating another trigger pulse corresponding to the second synchronization pulse according to the second delay time.
8. The touch driving method according to claim 1, wherein the interference signal is generated when the touch display device displays a vertical stripe (V-stripe) pattern.
9. The touch driving method as claimed in claim 1, wherein the touch display device uses a polarity line inversion, a zigzag pixel layout and a Tri-gate (Tri-gate) pixel structure.
10. The touch driving method as claimed in claim 1, wherein the synchronization signal is a horizontal synchronization signal (Hsync) generated by a timing control unit of the touch display device.
11. A touch display device, comprising:
a touch display panel;
a display driving circuit;
a timing control unit for providing a synchronization signal to the display driving circuit;
a touch control unit coupled to the timing control unit, the touch control unit being configured to:
detecting the synchronization signal;
receiving an interference signal from the touch display panel, wherein the interference signal comprises a plurality of interference pulses;
estimating a delay time corresponding to a time interval between the synchronization signal and one of the interference pulses;
generating a plurality of trigger pulses within a fixed period of the synchronization signal according to the synchronization signal and the delay time; and
outputting a plurality of touch driving pulses corresponding to the trigger pulses to the touch display panel; and
and the touch control driving unit is coupled with the touch control unit and used for generating the touch control driving pulse according to the trigger pulse.
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|---|---|---|---|---|
| CN109885204B (en) * | 2019-02-28 | 2022-04-12 | 业成科技（成都）有限公司 | Touch display method, touch display control circuit and touch display device |
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| TWI678654B (en) | 2019-12-01 |
| CN109324717A (en) | 2019-02-12 |
| TW202018477A (en) | 2020-05-16 |
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