CN112799538A - Touch driving method, touch driving device and touch display device - Google Patents
Touch driving method, touch driving device and touch display device Download PDFInfo
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- 238000007599 discharging Methods 0.000 description 25
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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
- G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
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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
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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Abstract
The invention provides a touch driving method, a touch driving device and a touch display device, and relates to the technical field of touch. According to the invention, the scanning signal is input to the first target touch electrode, each scanning cycle of the scanning signal comprises a charging stage, the charging stage is divided into a first time period and a second time period, a first voltage value of the scanning signal in the first time period is greater than a second voltage value of the scanning signal in the second time period, and an induction signal output by the second target touch electrode is received, so that the touch position is determined according to the induction signal. By increasing the voltage value of the scanning signal in the first time period, the charging speed of the scanning signal to the touch capacitor is increased in the first time period, so that the touch capacitor corresponding to the touch electrode far away from the scanning signal input end can be charged to the target voltage value in the charging stage, and the touch sensitivity corresponding to the touch electrode far away from the scanning signal input end is increased.
Description
Technical Field
The present invention relates to the field of touch technologies, and in particular, to a touch driving method, a touch driving device, and a touch display device.
Background
With the continuous development of display technologies, display devices such as mobile phones, tablet computers, digital cameras, intelligent wearable products and the like with touch functions are more and more concerned by people, and in order to realize the touch function, a touch panel needs to be arranged in the display products.
At present, when a scanning signal is provided to a touch electrode in a touch panel to charge a touch capacitor corresponding to the touch electrode, because the impedance of the touch electrode exists, a voltage value input by the touch electrode far from a scanning signal input end is smaller than a voltage value input by the touch electrode close to the scanning signal input end, and a phenomenon that the touch capacitor corresponding to the touch electrode far from the scanning signal input end cannot be charged to a target voltage value exists in a charging stage, which results in a decrease in touch sensitivity corresponding to the touch electrode far from the scanning signal input end.
Disclosure of Invention
The invention provides a touch driving method, a touch driving device and a touch display device, which are used for solving the problem that the touch sensitivity corresponding to a touch electrode far away from a scanning signal input end is reduced.
In a first aspect, the present invention provides a touch driving method applied to a touch panel, where the touch panel includes a plurality of first touch electrodes and a plurality of second touch electrodes, and the method includes:
inputting a scanning signal to a first target touch electrode; each scanning cycle of the scanning signal comprises a charging phase, wherein the charging phase is divided into a first time period and a second time period, a first voltage value of the scanning signal in the first time period is greater than a second voltage value of the scanning signal in the second time period, and the second voltage value is an original charging voltage value;
receiving an induction signal output by a second target touch electrode to determine a touch position according to the induction signal;
the first target touch electrode is the first touch electrode, and the second target touch electrode is the second touch electrode; or, the first target touch electrode is the first touch electrode and the second touch electrode, and the second target touch electrode is also the first touch electrode and the second touch electrode.
Optionally, the first time period is an initial time period of the charging phase, and a ratio between a duration of the first time period and a duration of the charging phase is greater than 0 and less than or equal to 0.75.
Optionally, a ratio of the first voltage value to the second voltage value is greater than 1 and less than or equal to 1.5.
Optionally, each scan cycle of the scan signal further includes a discharging phase, the discharging phase is divided into a third time period and a fourth time period, a third voltage value of the scan signal in the third time period is smaller than a fourth voltage value of the scan signal in the fourth time period, and the fourth voltage value is an original discharging voltage value, and the original discharging voltage value is smaller than the original charging voltage value.
Optionally, the third time period is an initial time period of the discharge phase, and a ratio between a duration of the third time period and a duration of the discharge phase is greater than 0 and less than or equal to 0.75.
Optionally, a difference between the fourth voltage value and the third voltage value is equal to a difference between the first voltage value and the second voltage value.
Optionally, the scanning frequency of the scanning signal is greater than or equal to 200 KHz.
Optionally, the touch panel is a self-contained touch panel or a mutual-contained touch panel.
In a second aspect, the present invention provides a touch driving device applied to a touch panel, where the touch panel includes a plurality of first touch electrodes and a plurality of second touch electrodes;
the touch driving device is configured to input a scanning signal to a first target touch electrode; receiving an induction signal output by a second target touch electrode to determine a touch position according to the induction signal; each scanning cycle of the scanning signal comprises a charging phase, wherein the charging phase is divided into a first time period and a second time period, a first voltage value of the scanning signal in the first time period is greater than a second voltage value of the scanning signal in the second time period, and the second voltage value is an original charging voltage value;
the first target touch electrode is the first touch electrode, and the second target touch electrode is the second touch electrode; or, the first target touch electrode is the first touch electrode and the second touch electrode, and the second target touch electrode is also the first touch electrode and the second touch electrode.
In a third aspect, the present invention provides a touch display device, which includes a touch panel and the touch driving device, where the touch panel is connected to the touch driving device.
Compared with the prior art, the invention has the following advantages:
by inputting a scanning signal to the first target touch electrode, each scanning cycle of the scanning signal includes a charging stage, the charging stage is divided into a first time period and a second time period, a first voltage value of the scanning signal in the first time period is greater than a second voltage value of the scanning signal in the second time period, and the second voltage value is an original charging voltage value, and receiving an induction signal output by the second target touch electrode, so as to determine a touch position according to the induction signal. The amplitude of the scanning signal in the first time period in the charging stage is changed, so that the voltage value of the scanning signal in the first time period is increased, the charging speed of the scanning signal to the touch capacitor corresponding to the touch electrode in the first time period is increased, the touch capacitor corresponding to the touch electrode far away from the input end of the scanning signal can be charged to a target voltage value in the charging stage, and the touch sensitivity corresponding to the touch electrode far away from the input end of the scanning signal is increased; and, only the voltage value of the scanning signal of the first time slot in the charging phase is increased, the power consumption is relatively low.
Drawings
Fig. 1 is a schematic diagram illustrating a scan signal input to a touch panel in the related art;
fig. 2 is a flowchart illustrating a touch driving method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a touch panel in the embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a scan signal input to a touch panel according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
In the related art, as shown in fig. 1, the scanning signal 11 provided to the touch electrode in the touch panel is a square wave signal, which is at a high level in a charging phase T1 and at a low level in a discharging phase T2, that is, a voltage value of the scanning signal 11 is Va in the charging phase T1, a voltage value of the scanning signal 11 is Vb in the discharging phase T2, and the voltage value Va is greater than the voltage value Vb; 12 refers to the voltage stored in the touch capacitor corresponding to the touch electrode.
When the scanning signal 11 is provided to the touch electrode to charge the touch capacitor corresponding to the touch electrode, because the impedance of the touch electrode exists, the voltage value input by the touch electrode far from the scanning signal input end is reduced, so that the voltage value input by the touch electrode far from the scanning signal input end is smaller than the voltage value input by the touch electrode close to the scanning signal input end, and then in the charging stage T1, the charging speed of the touch capacitor corresponding to the touch electrode far from the scanning signal input end is slower, and the voltage stored by the touch capacitor corresponding to the touch electrode far from the scanning signal input end is smaller than the target voltage value (i.e. the voltage value Va provided by the scanning signal in the charging stage T1), so that the touch capacitor corresponding to the touch electrode far from the scanning signal input end cannot be charged to the required target voltage value, and the touch capacitor corresponding to the touch electrode close to the scanning signal input end can be normally charged to the target voltage value, therefore, the touch sensitivity of the touch panel is not consistent between the touch electrode far from the scan signal input end and the touch electrode close to the scan signal input end.
In order to improve the touch sensitivity of the touch electrode far away from the scan signal input end, the touch electrode is made of a low-impedance material or a bilateral driving mode is adopted to reduce the voltage loss input by the touch electrode far away from the scan signal input end, but the improvement effect is poor, the improvement period is long, and much manpower and material resources are spent. In addition, the touch sensitivity can also be improved by increasing the voltage value of the scan signal in the whole charging period T1, but the power consumption of the touch panel is increased by increasing the voltage value of the scan signal.
Therefore, in the embodiment of the present invention, the amplitude of the scanning signal in the first time period in the charging stage is changed, so that the voltage value of the scanning signal in the first time period is increased, and the charging speed of the scanning signal to the touch capacitor corresponding to the touch electrode in the first time period is increased, so that the touch capacitor corresponding to the touch electrode far away from the scanning signal input end in the charging stage can also be charged to the target voltage value, and the touch sensitivity corresponding to the touch electrode far away from the scanning signal input end is increased; and, only the voltage value of the scanning signal of the first time slot in the charging phase is increased, the power consumption is relatively low.
Example one
Referring to fig. 2, a flowchart of a touch driving method according to an embodiment of the present invention is shown, and is applied to a touch panel, where the method specifically includes the following steps:
As shown in fig. 3, the touch panel 30 includes a plurality of first touch electrodes 31 and a plurality of second touch electrodes 32, and the first touch electrodes 31 and the second touch electrodes 32 are insulated from each other. In practical products, the touch panel 30 is a self-contained touch panel or a mutual-contained touch panel.
The touch panel 30 shown in fig. 3 is a mutual capacitance type touch panel, and for the mutual capacitance type touch panel, the first touch electrodes 31 distributed along the first distribution are connected together, the second touch electrodes 32 distributed along the second direction are also connected together, the first direction and the second direction are arranged crosswise, specifically, the first direction and the second direction may be perpendicular to each other, for example, the first direction is a row direction of the touch panel 30, and the second direction is a column direction of the touch panel 30.
In order to ensure that the first touch electrode 31 and the second touch electrode 32 are insulated from each other, the first touch electrode 31 and the second touch electrode 32 may be disposed in different layers, and an insulating layer is disposed between the first touch electrode 31 and the second touch electrode 32; or, the first touch electrode 31 and the second touch electrode 32 are disposed on the same layer, but the connection position of two adjacent second touch electrodes 32 is bridged, that is, a bridging electrode is formed on the substrate first, then an insulating layer covering the bridging electrode is formed, the insulating layer is etched to form a through via, finally, the first touch electrode 31 and the second touch electrode 31 are formed on the insulating layer, two adjacent first touch electrodes 31 are directly connected together, and two adjacent second touch electrodes 32 are connected with the bridging electrode through the through via penetrating the insulating layer, thereby realizing bridging of two adjacent second touch electrodes 32.
At this time, a touch capacitance is formed at a position where the first touch electrode 31 and the second touch electrode 32 overlap each other; the first touch electrode 31 serves as a touch driving electrode, and the second touch electrode 32 serves as a touch sensing electrode.
For the self-contained touch panel, each first touch electrode 31 and each second touch electrode 32 are independently arranged, and any two first touch electrodes 31 and any two second touch electrodes 32 are not connected; touch capacitance is formed between the first touch electrode 31 and the second touch electrode 32 and ground, and at this time, the first touch electrode 31 and the second touch electrode 32 are both used as touch driving electrodes.
In the embodiment of the present invention, when the touch position needs to be detected, the touch driving chip inputs the scan signal 41 shown in fig. 4 to the first target touch electrode.
When the touch panel 30 is a mutual capacitance type touch panel, the first target touch electrode is a first touch electrode 31; when the touch panel 30 is a self-contained touch panel, the first target touch electrode is a first touch electrode 31 and a second touch electrode 32.
Moreover, each scan cycle of the scan signal 41 in fig. 4 includes a charging phase T1 and a discharging phase T2, in the charging phase T1, the scan signal 41 is at a high level for charging the touch capacitor, and in the discharging phase T2, the scan signal 41 is at a low level for discharging the touch capacitor; the voltage stored in the touch capacitor corresponding to the touch electrode is denoted by 42 in fig. 4.
Specifically, the charging phase T1 is divided into a first time period T11 and a second time period T12, a first voltage value V1 of the scan signal 41 in the first time period T11 is greater than a second voltage value V2 of the scan signal 41 in the second time period T12, and the second voltage value V2 is an original charging voltage value, which refers to the voltage value Va of the scan signal 11 in the charging phase T1 in the related art, that is, the second voltage value V2 is equal to the original charging voltage value Va.
In the charging stage T1, by increasing the voltage value of the scan signal 41 in the first time period T11 to the first voltage value V1, and the second voltage value of the scan signal 41 in the second time period T12 remains the original charging voltage value Va, the charging speed of the scan signal 41 to the touch capacitor corresponding to the touch electrode is increased in the first time period T11, so that in the charging stage T1, the touch capacitor corresponding to the touch electrode far away from the scan signal input end can be charged to the target voltage value, and meanwhile, the touch capacitor corresponding to the touch electrode close to the scan signal input end can also be charged to the target voltage value, which is equal to the original charging voltage value Va. Therefore, the touch sensitivity corresponding to the touch electrode far away from the scanning signal input end is improved, and therefore the uniformity of the touch sensitivity corresponding to the touch electrode far away from the scanning signal input end and the touch electrode close to the scanning signal input end is improved. Compared with the prior art that the touch sensitivity is improved by adopting a low-impedance material to manufacture the touch electrode or adopting a bilateral driving mode, the embodiment of the invention has the advantages that the touch sensitivity is improved by changing the scanning signal mode without changing the material and the manufacturing process of the touch panel, the improvement effect is better, the improvement period is short, and less manpower and material resources are spent.
In addition, only the voltage value of the scan signal 41 in the first time period T11 in the charging phase T1 is increased, and the voltage value of the scan signal 41 in the second time period T12 is consistent with the voltage value in the related art, so that the power consumption is relatively low compared with the method of increasing the voltage values of the scan signals in the entire charging phase T1 to improve the touch sensitivity in the related art, in the embodiment of the present invention, only the voltage value of the scan signal 41 in the first time period T11 is increased.
Wherein, the first time period T11 is an initial time period of the charging phase T1, and a ratio between a duration of the first time period T11 and a duration of the charging phase T1 is greater than 0 and less than or equal to 0.75.
In the actual driving process, the first time period T11 refers to an initial stage in the current scan period from the previous scan period to the current scan period, that is, an initial stage after the scan signal 41 changes from the low level of the previous scan period to the high level of the current scan period.
By directly increasing the voltage value of the scan signal 41 to the first voltage value V1 in the initial stage of the scan signal 41 changing from the low level to the high level, the charging speed of the touch capacitor can be rapidly increased when the touch capacitor corresponding to the touch electrode is charged by the scan signal 41, and even if the voltage value of the scan signal 41 is decreased from the first voltage value V1 to the second voltage value V2 in the second time period T12, the charging speed is relatively fast, so that the touch capacitor corresponding to the touch electrode far from the scan signal input terminal can be charged to the target voltage value in the charging stage T1.
Also, the ratio between the duration of the first period T11 and the duration of the charging phase T1 is greater than 0 and less than or equal to 0.75. At this time, the ratio between the duration of the second period T12 and the duration of the charging period T1 is greater than 0 and less than or equal to 0.25, and the sum of the duration of the first period T11 and the duration of the second period T12 is equal to the duration of the charging period T1.
For example, the ratio between the duration of the first time period T11 and the duration of the charging phase T1 may be 0.25, 0.5, 0.75, or the like. When the ratio between the duration of the first period T11 and the duration of the charging phase T1 is 0.25, the ratio between the duration of the second period T12 and the duration of the charging phase T1 is 0.75; when the ratio between the duration of the first period T11 and the duration of the charging phase T1 is 0.5, the ratio between the duration of the second period T12 and the duration of the charging phase T1 is 0.5; when the ratio between the duration of the first period T11 and the duration of the charging phase T1 is 0.75, the ratio between the duration of the second period T12 and the duration of the charging phase T1 is 0.25.
If the duration of the charging period T1 is 10 μ s and the ratio between the duration of the first time period T11 and the duration of the charging period T1 is 0.25, the duration of the first time period T11 may be 2.5 μ s and the duration of the second time period T12 may be 7.5 μ s.
In the embodiment of the invention, the ratio of the first voltage value V1 to the second voltage value V2 is greater than 1 and less than or equal to 1.5. For example, the ratio of the first voltage value V1 to the second voltage value V2 is 1.1, 1.2, 1.3, or 1.4, etc.
That is, when the voltage value of the scan signal 41 for the first period T11 in the charging period T1 is increased, the rising amplitude of the voltage value of the scan signal 41 in the first period T11 needs to be less than or equal to 50% of the original charging voltage value Va.
For example, if the second voltage value V2 is 6V, the first voltage value V1 of the scan signal 41 in the first time period T11 can be set to 9V, i.e., the voltage value of the scan signal 41 in the first time period T11 is raised by 3V, and of course, the voltage value of the scan signal 41 in the first time period T11 can also be raised by 1V or 2V, etc.
If the ratio of the first voltage value V1 to the second voltage value V2 is too large, that is, the voltage value of the scan signal 41 in the first time period T11 is too large, the power consumption of the touch panel 30 is increased, and therefore, the ratio of the first voltage value V1 to the second voltage value V2 is reasonably set, so that the touch sensitivity corresponding to the touch electrode far from the scan signal input end is improved, and the increased power consumption is prevented from being too large.
It should be noted that, for different types of touch panels 30, the ratio between the duration of the first time period T11 and the duration of the charging period T1, and the ratio between the first voltage value V1 and the second voltage value V2 may be different, and therefore, it is necessary to perform simulation and test to select the most suitable duration of the first time period T11 and the most suitable first voltage value V1.
In the embodiment of the present invention, the touch driving chip inputs the scanning signal 41 to the first target touch electrode, charges the touch capacitors through the scanning signal 41, and charges the touch capacitors corresponding to all the first target touch electrodes in the touch panel 30 to a target voltage value, so that when a finger of a user presses the touch panel 30, a capacitance value of the touch capacitor at a pressing position changes, that is, an induction signal output by each second target touch electrode changes, and the touch driving chip receives the induction signal output by each second target touch electrode and determines the touch position of the user according to the induction signal output by each second target touch electrode.
When the touch panel 30 is a mutual capacitance type touch panel, the second target touch electrode is the second touch electrode 32; when the touch panel 30 is a self-contained touch panel, the second target touch electrodes are also the first touch electrode 31 and the second touch electrode 32.
Considering that the discharging completely facilitates the charging of the next scanning period, after the touch capacitor is charged to realize the detection of the touch position, the scanning signal 41 is changed from the high level to the low level, thereby realizing the discharging of the touch capacitor.
Therefore, each scan cycle of the scan signal 41 further includes a discharging period T2, the discharging period T2 is divided into a third time period T21 and a fourth time period T22, the third voltage value V3 of the scan signal 41 in the third time period T21 is smaller than the fourth voltage value V4 of the scan signal 41 in the fourth time period T22, and the fourth voltage value V4 is an original discharging voltage value, which is smaller than the original charging voltage value.
The original discharge voltage value refers to a voltage value Vb of the scan signal 11 in the discharge phase T2 in the related art, that is, the fourth voltage value V4 is equal to the original discharge voltage value Vb, and the original discharge voltage value Vb is smaller than the original charge voltage value Va, and is generally equal to 0V.
In the discharging stage T2, by directly decreasing the voltage value of the scan signal 41 in the third time period T21 to the third voltage value V3, and the fourth voltage value V4 of the scan signal 41 in the fourth time period T22 remains the original discharging voltage value Vb, the discharging speed of the scan signal 41 to the touch capacitor corresponding to the touch electrode is increased in the third time period T21, so that the touch capacitor corresponding to each touch electrode can be discharged more quickly in the discharging stage T2, that is, the touch capacitor corresponding to each touch electrode can make the stored voltage value be 0 more quickly.
As can also be seen from comparing fig. 1 and fig. 4, in the same scanning period, compared to the scanning signal in the related art, the scanning signal in the embodiment of the present invention has a faster charging and discharging speed when charging and discharging the touch capacitor, and the touch capacitor can be charged to the target voltage value, so as to improve the touch sensitivity of the touch electrode. And when the charging and discharging time of the touch capacitor is shortened, the scanning period of the scanning signal can be reduced, and the scanning frequency of the scanning signal can be improved, so that the point reporting rate of the touch panel can be further improved.
In addition, when the scanning period of the scanning signal is shortened, the touch scanning of the touch panel can be realized in the idle stage between two frames of pictures displayed by the display panel, so that the problem that the signal on the touch electrode is subjected to crosstalk due to the alternating change of various voltages on a Thin Film Transistor (TFT) when the touch scanning is performed in the display of the display panel is avoided.
Wherein the third period T21 is the initial period of the discharge phase T2, and the ratio between the duration of the third period T21 and the duration of the discharge phase T2 is greater than 0 and less than or equal to 0.75.
In the actual driving process, the second time period T21 refers to the initial stage after the charging stage T1 to the discharging stage T2 in each scan cycle, that is, the initial stage after the scan signal 41 changes from the high level to the low level in each scan cycle.
By directly decreasing the voltage value of the scan signal 41 to the third voltage value V3 in the initial stage after the scan signal 41 changes from the high level to the low level, the discharge speed of the touch capacitor can be rapidly increased when the touch capacitor corresponding to the touch electrode is discharged by the scan signal 41, and even if the voltage value of the scan signal 41 is increased from the third voltage value V3 to the fourth voltage value V4 in the fourth time period T22, the discharge speed is relatively high, so that the touch capacitor corresponding to each touch electrode can be completely discharged in the discharge stage T2.
And, the ratio between the duration of the third period T21 and the duration of the discharge period T2 is greater than 0 and less than or equal to 0.75. At this time, the ratio between the duration of the fourth period T22 and the duration of the discharge period T2 is greater than 0 and less than or equal to 0.25, and the sum of the duration of the third period T21 and the duration of the fourth period T22 is equal to the duration of the discharge period T2.
For example, the ratio between the duration of the third period T21 and the duration of the discharge phase T2 may be 0.25, 0.5, 0.75, or the like. When the ratio between the duration of the third period T21 and the duration of the discharge period T2 is 0.25, the ratio between the duration of the fourth period T22 and the duration of the discharge period T2 is 0.75; when the ratio between the duration of the third period T21 and the duration of the discharge phase T2 is 0.5, the ratio between the duration of the fourth period T22 and the duration of the discharge phase T2 is 0.5; when the ratio between the duration of the third period T21 and the duration of the discharge period T2 is 0.75, the ratio between the duration of the fourth period T22 and the duration of the discharge period T2 is 0.25.
If the duration of the discharge period T2 is 15 μ s, and the ratio between the duration of the third period T21 and the duration of the discharge period T2 is 0.5, the duration of the third period T21 is 7.5 μ s, and the duration of the fourth period T22 is also 7.5 μ s.
In the embodiment of the present invention, the difference between the fourth voltage value V4 and the third voltage value V3 is equal to the difference between the first voltage value V1 and the second voltage value V2, i.e., V4-V3 is V1-V2.
For example, the first voltage value V1 is 9V, the second voltage value V2 is 6V, and the fourth voltage value V4 is 0V, the third voltage value V3 is set to-3V.
By setting the difference between the fourth voltage value V4 and the third voltage value V3 equal to the difference between the first voltage value V1 and the second voltage value V2, it can also be avoided that the difference between the fourth voltage value V4 and the third voltage value V3 is too large, which results in too much power consumption of the touch panel in the discharging stage T2, and therefore, the power consumption of the touch panel is relatively low by reasonably setting the difference between the fourth voltage value V4 and the third voltage value V3.
In the embodiment of the present invention, the voltage value of the scan signal 41 in the first time period T11 is increased to the first voltage value V1, and the voltage value of the scan signal 41 in the third time period T21 is decreased to the third voltage value V3, so that the charging and discharging speed of the touch capacitor can be increased, and the charging and discharging time of the touch capacitor can be shortened.
In the embodiment of the present invention, the amplitude of the scanning signal in the first time period in the charging stage is changed, so that the voltage value of the scanning signal in the first time period is increased, and the charging speed of the scanning signal to the touch capacitor corresponding to the touch electrode in the first time period is increased, so that the touch capacitor corresponding to the touch electrode far away from the scanning signal input end in the charging stage can also be charged to the target voltage value, and the touch sensitivity corresponding to the touch electrode far away from the scanning signal input end is increased; and, only the voltage value of the scanning signal of the first time slot in the charging phase is increased, the power consumption is relatively low.
Example two
The embodiment of the present invention further provides a touch driving device, which is applied to a touch panel 30, wherein the touch panel 30 includes a plurality of first touch electrodes 31 and a plurality of second touch electrodes 32; a touch driving device configured to input a scan signal to a first target touch electrode; receiving an induction signal output by the second target touch electrode so as to determine a touch position according to the induction signal; each scan cycle of the scan signal 41 includes a charging phase T1, the charging phase T1 is divided into a first time period T11 and a second time period T12, a first voltage value V1 of the scan signal 41 within the first time period T11 is greater than a second voltage value V2 of the scan signal 41 within the second time period T12, and the second voltage value V2 is an original charging voltage value; wherein, the first target touch electrode is a first touch electrode 31, and the second target touch electrode is a second touch electrode 32; alternatively, the first target touch electrode is the first touch electrode 31 and the second touch electrode 32, and the second target touch electrode is also the first touch electrode 31 and the second touch electrode 32.
When the touch panel 30 is a mutual capacitance type touch panel, the first target touch electrode is a first touch electrode 31, and the second target touch electrode is a second touch electrode 32; when the touch panel 30 is a self-contained touch panel, the first target touch electrode is a first touch electrode 31 and a second touch electrode 32, and the second target touch electrode is also the first touch electrode 31 and the second touch electrode 32.
The material of the first touch electrode 31 and the second touch electrode 32 may be a transparent conductive material, such as ITO (Indium Tin Oxides).
The embodiment of the present invention further provides a touch display device, which includes a touch panel 30 and the touch driving device, wherein the touch panel 30 is connected to the touch driving device.
The touch driving device is actually a touch driving chip 50 shown in fig. 3, the touch display device further includes a first electrode connecting line 51 and a second electrode connecting line 52, the first electrode connecting line 51 is respectively connected to the first touch electrode 31 and the touch driving chip 50, the second electrode connecting line 52 is respectively connected to the second touch electrode 32 and the touch driving chip 50, the first touch electrode 31 is connected to the touch driving chip 50 through the first electrode connecting line 51, and the second touch electrode 32 is connected to the touch driving chip 50 through the second electrode connecting line 52.
In addition, the touch display device further includes a TCON (Timer Control Register), a gate driving chip and a source driving chip respectively connected to the TCON, and a display panel connected to both the gate driving chip and the source driving chip, and the touch panel may be disposed on a light emitting side of the display panel.
In practical applications, the touch display device may be: any product or component with display and touch functions, such as a mobile phone, a tablet computer, a display, a notebook computer, a navigator, an electronic whiteboard and the like.
In the embodiment of the present invention, the amplitude of the scanning signal in the first time period in the charging stage is changed, so that the voltage value of the scanning signal in the first time period is increased, and the charging speed of the scanning signal to the touch capacitor corresponding to the touch electrode in the first time period is increased, so that the touch capacitor corresponding to the touch electrode far away from the scanning signal input end in the charging stage can also be charged to the target voltage value, and the touch sensitivity corresponding to the touch electrode far away from the scanning signal input end is increased; and, only the voltage value of the scanning signal of the first time slot in the charging phase is increased, the power consumption is relatively low.
While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The touch driving method, the touch driving device and the touch display device provided by the invention are described in detail above, and specific examples are applied in the text to explain the principle and the implementation of the invention, and the description of the above embodiments is only used to help understanding the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A touch driving method is applied to a touch panel, the touch panel comprises a plurality of first touch electrodes and a plurality of second touch electrodes, and the method comprises the following steps:
inputting a scanning signal to a first target touch electrode; each scanning cycle of the scanning signal comprises a charging phase, wherein the charging phase is divided into a first time period and a second time period, a first voltage value of the scanning signal in the first time period is greater than a second voltage value of the scanning signal in the second time period, and the second voltage value is an original charging voltage value;
receiving an induction signal output by a second target touch electrode to determine a touch position according to the induction signal;
the first target touch electrode is the first touch electrode, and the second target touch electrode is the second touch electrode; or, the first target touch electrode is the first touch electrode and the second touch electrode, and the second target touch electrode is also the first touch electrode and the second touch electrode.
2. The method of claim 1, wherein the first time period is an initial time period of the charging phase, and a ratio between a duration of the first time period and a duration of the charging phase is greater than 0 and less than or equal to 0.75.
3. The method of claim 1, wherein a ratio of the first voltage value to the second voltage value is greater than 1 and less than or equal to 1.5.
4. The method of claim 1, wherein each scan cycle of the scan signal further comprises a discharge phase, the discharge phase is divided into a third time period and a fourth time period, a third voltage value of the scan signal in the third time period is smaller than a fourth voltage value of the scan signal in the fourth time period, and the fourth voltage value is an original discharge voltage value, and the original discharge voltage value is smaller than the original charge voltage value.
5. The method of claim 4, wherein the third time period is an initial time period of the discharge phase, and a ratio between a time length of the third time period and a time length of the discharge phase is greater than 0 and less than or equal to 0.75.
6. The method of claim 4, wherein a difference between the fourth voltage value and the third voltage value is equal to a difference between the first voltage value and the second voltage value.
7. The method of claim 1, wherein a sweep frequency of the sweep signal is greater than or equal to 200 KHz.
8. The method according to any one of claims 1 to 7, wherein the touch panel is a self-contained touch panel or a mutual-contained touch panel.
9. A touch driving device is applied to a touch panel, and the touch panel comprises a plurality of first touch electrodes and a plurality of second touch electrodes;
the touch driving device is configured to input a scanning signal to a first target touch electrode; receiving an induction signal output by a second target touch electrode to determine a touch position according to the induction signal; each scanning cycle of the scanning signal comprises a charging phase, wherein the charging phase is divided into a first time period and a second time period, a first voltage value of the scanning signal in the first time period is greater than a second voltage value of the scanning signal in the second time period, and the second voltage value is an original charging voltage value;
the first target touch electrode is the first touch electrode, and the second target touch electrode is the second touch electrode; or, the first target touch electrode is the first touch electrode and the second touch electrode, and the second target touch electrode is also the first touch electrode and the second touch electrode.
10. A touch display device comprising a touch panel and the touch driving device as claimed in claim 9, wherein the touch panel is connected to the touch driving device.
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