CN108874248B - Driving method and related device of touch screen - Google Patents

Driving method and related device of touch screen Download PDF

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CN108874248B
CN108874248B CN201810517918.1A CN201810517918A CN108874248B CN 108874248 B CN108874248 B CN 108874248B CN 201810517918 A CN201810517918 A CN 201810517918A CN 108874248 B CN108874248 B CN 108874248B
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touch
electrodes
column
driving
touch screen
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CN108874248A (en
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关琳燕
涂骏
郑志伟
杨康鹏
许育民
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Xiamen Tianma Microelectronics Co Ltd
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Xiamen Tianma Microelectronics Co Ltd
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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
    • 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
    • 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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  • General Engineering & Computer Science (AREA)
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  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Position Input By Displaying (AREA)

Abstract

The invention discloses a driving method and a related device of a touch screen, which are used for controlling the touch screen to display a picture in a display stage within one frame time so as to enable the touch screen to realize the picture display function. In a touch control stage within one frame time, a touch control driving signal with a frequency which is not within a sound frequency range most sensitive to human ears is loaded to each touch control electrode in the touch screen, so that the stretching change frequency of a film layer in the touch screen can deviate from the sound frequency most sensitive to human ears, the howling level is reduced, and the application reliability of the touch screen is improved. And the touch position is judged by detecting the capacitance value change of each touch electrode, so that the touch screen realizes the touch function.

Description

Driving method and related device of touch screen
Technical Field
The present invention relates to the field of touch display technologies, and in particular, to a driving method of a touch screen and a related device.
Background
With the rapid development of display technology, Touch screens (Touch panels) have gradually spread throughout the lives of people. Generally, a touch screen is provided with a touch electrode, and a touch driving signal having a plurality of pulse signals is applied to the touch electrode to implement a touch function. Since the touch screen is usually further provided with film layers such as interlayer dielectric layers, the touch electrode and the film layers, such as the interlayer dielectric layers, form a coupling capacitor. Therefore, when the touch electrode is periodically loaded with a touch driving signal with a plurality of pulse signals, the coupling capacitor continuously accumulates charges so as to periodically form a parasitic electric field, so that other film layers arranged between the touch electrode and the interlayer dielectric layer are polarized, and an electrostrictive effect is generated. The film layers are affected by the electrostrictive effect, and the stretching change can be generated, so that the squeaking phenomenon of the touch screen can be caused. And the closer the frequency of the stretching changes is to the sound frequency to which the human ear is most sensitive (e.g., 1kHz), the higher the howling level, resulting in reduced reliability of the touch screen application.
Disclosure of Invention
The embodiment of the invention provides a driving method and a related device of a touch screen, which are used for solving the problem of high squeal level of the touch screen.
Therefore, an embodiment of the present invention provides a method for driving a touch panel, including:
in a touch control stage within one frame time, loading a touch control driving signal with a frequency which is not within a sound frequency range most sensitive to human ears to each touch control electrode in the touch screen according to a preset condition, and judging a touch control position by detecting capacitance value change of each touch control electrode;
and controlling the touch screen to display the picture in a display stage within one frame time.
Correspondingly, an embodiment of the present invention further provides a driving apparatus for a touch screen, including:
the touch control driving unit is used for loading a touch control driving signal with a frequency which is not in a sound frequency range most sensitive to human ears to each touch control electrode in the touch screen according to a preset condition in a touch control stage within one frame time, and judging a touch control position by detecting capacitance value change of each touch control electrode;
and the display driving unit is used for controlling the touch screen to display the picture in the display stage within one frame time.
Correspondingly, an embodiment of the present invention further provides a display device, including: the embodiment of the invention provides a driving device of a touch screen.
Accordingly, the embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the driving method of the touch screen provided by the embodiment of the present invention.
Correspondingly, the embodiment of the invention also provides computer equipment, which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein when the processor executes the program, the steps of the driving method of the touch screen provided by the embodiment of the invention are realized.
The invention has the following beneficial effects:
according to the driving method and the related device of the touch screen provided by the embodiment of the invention, the touch screen is controlled to display the picture in the display stage within one frame time, so that the touch screen realizes the picture display function. In a touch control stage within one frame time, a touch control driving signal with a frequency which is not within a sound frequency range most sensitive to human ears is loaded to each touch control electrode in the touch screen, so that the stretching change frequency of a film layer in the touch screen can deviate from the sound frequency most sensitive to human ears, the howling level is reduced, and the application reliability of the touch screen is improved. And the touch position is judged by detecting the capacitance value change of each touch electrode, so that the touch screen realizes the touch function.
Drawings
FIG. 1a is a schematic diagram of a touch electrode in the related art;
FIG. 1b is a schematic cross-sectional view of a touch screen in the related art;
FIG. 1c is a schematic top view of a touch panel of the related art;
FIG. 2 is a timing diagram of signals applied to a touch electrode in the related art;
fig. 3 is a flowchart of a driving method according to an embodiment of the present invention;
fig. 4 to fig. 13 are timing diagrams of signals applied to the touch electrodes according to an embodiment of the invention;
fig. 14 is a schematic structural diagram of a driving device according to an embodiment of the present invention.
Detailed Description
At present, a touch screen can be divided into: an Add On Mode Touch Panel (Add On Touch Panel), an overlay surface Touch Panel (On Cell Touch Panel), and an In Cell Touch Panel (In Cell Touch Panel). The touch electrode can be embedded inside the display screen, so that the whole thickness of the display screen can be reduced, and the embedded touch screen is widely concerned. Moreover, the touch screen can be divided into: self-capacitance touch screens and mutual capacitance touch screens. Among them, mutual capacitance touch screens generally include: the touch control device comprises a plurality of touch control electrodes and a plurality of induction electrodes which are crossed and arranged in an insulating mode. In order to enable the mutual capacitance touch screen to realize a touch function, generally, a touch driving signal having a plurality of pulse signals is sequentially loaded on the touch electrodes by a touch driving IC (Integrated Circuit), and all the sensing electrodes receive the sensing signal at the same time, so that the capacitance of the two-dimensional plane of the whole mutual capacitance touch screen can be obtained, and thus, the position of a touch point is determined according to the change of the capacitance value, thereby realizing the touch function. Self-capacitance touch screens generally include: in order to enable the self-capacitance touch screen to realize a touch function, a touch driving signal with a plurality of pulse signals is generally loaded on the touch electrode by a touch driving IC, when a human body does not touch the screen, the capacitance of each touch electrode is a fixed value, when the human body touches the screen, the capacitance of the touch electrode corresponding to a touch position is the fixed value and is superposed with the capacitance of the human body, and the touch driving IC can judge the touch position by detecting the capacitance value change of each touch electrode, so that the touch function is realized.
In order to reduce the manufacturing process and thickness, as shown in fig. 1a, the transparent conductive layer used as a common (VCOM) electrode on the touch screen may be divided into several blocks to be used as touch electrodes 110, and the touch electrodes 110 are connected to the touch driving IC130 by using touch traces 120 connected to the touch electrodes 110 in a one-to-one correspondence. In addition, in order to avoid mutual interference between display and touch control, the touch screen can be driven in a time-sharing mode. As shown in fig. 2, the driving timing of the touch screen within one frame time may include: touch phase Touch and Display phase Display which are alternately arranged. Specifically, in the Display phase, a common voltage signal with a fixed voltage value is applied to the touch electrode 110, so that the touch screen displays an image. In the Touch phase Touch, a Touch driving signal having a plurality of pulse signals is applied to the Touch electrodes 110, and the Touch position is determined by detecting the capacitance value change of each Touch electrode 110, so that the Touch screen realizes a Touch function.
In a specific implementation, the touch screen may be a liquid crystal display, or may also be an organic light emitting diode display, which is not limited herein.
When the touch screen is a liquid crystal display screen, as shown in fig. 1b, it may include an array substrate 100 and an opposite substrate 200 disposed opposite to each other, and a liquid crystal layer (not shown in fig. 1 b) disposed between the array substrate 100 and the opposite substrate 200. Here, the common electrode as the touch electrode may be disposed on the opposite substrate 200, or the common electrode as the touch electrode may be disposed on the array substrate. The following description will be given taking an example in which a common electrode as a touch electrode is provided on the counter substrate 200. In practical applications, the touch panel further includes a plurality of pixels PX, and in order to perform display driving, as shown in fig. 1b and 1c, a thin film transistor 140 and a pixel electrode 180 located in each pixel PX are generally further disposed on the array substrate 100. The thin film transistor 140 may include an active layer 141, a gate electrode 142, a source electrode 143, and a drain electrode 144. The source electrode 143 and the drain electrode 144 are usually made of a metal material. The gate electrode 142 is also typically made of a metal material. In addition, a gate line gate _ M (M is an integer greater than or equal to 1 and less than or equal to M, where M is the total number of gate lines in the touch screen, and in fig. 1c, M is 18 as an example) for transmitting a gate scanning signal is further disposed on the layer where the gate 142 is located, where one gate line gate _ M corresponds to one row of pixels PX. A data line (not shown in fig. 1b and 1 c) for transmitting a data signal is further disposed on the layer where the source electrode 143 is located. The gate electrode of the thin film transistor 140 is electrically connected to the corresponding gate line, the source electrode is electrically connected to the corresponding data line, and the drain electrode is electrically connected to the pixel electrode. The thin film transistor 140 is turned on under the control of a gate scan signal transmitted from the gate line to supply a data signal transmitted from the data line to the pixel electrode. For insulation, a gate insulating layer 150 is further provided between the active layer 141 and the gate electrode 142, an interlayer insulating layer 150 is further provided between the gate electrode 142 and the source electrode 143, and a planarization layer 170 is further provided on a side of the source electrode 143 away from the substrate 100.
In practical applications, the touch electrode and the gate, the source, the drain, and the like may form a parasitic capacitance. Therefore, when the touch driving signal is periodically loaded on the touch electrode, the coupling capacitor periodically forms a parasitic electric field. For example, when a parasitic electric field is formed between the touch electrode and the gate, the source and the drain disposed between the touch electrode and the gate are polarized, thereby generating an electrostrictive effect. The source electrode and the drain electrode are affected by the electrostrictive effect, and can generate stretching change, so that the touch screen has a squeal phenomenon after the stretching change has a certain frequency. Moreover, the higher the frequency of the touch driving signal is, the higher the frequency of the expansion and contraction change is. Since the frequency range of the most sensitive sound of human ears is generally 1kHz to 3kHz, the closer the frequency of the stretching change is to the most sensitive sound of human ears, the higher the howling level is, and thus the application reliability of the touch screen is reduced.
Based on this, the embodiment of the invention provides a driving method and a related device for a touch screen, which can reduce the howling level of the touch screen.
In order to make the objects, technical solutions and advantages of the present invention clearer, specific embodiments of a driving method of a touch screen and a related apparatus according to an embodiment of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments described below are only for illustrating and explaining the present invention and are not to be used for limiting the present invention. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict. In addition, the size and shape of the various figures in the drawings are not intended to reflect the true scale of the touch screen, but are merely illustrative of the present invention.
The driving method of the touch screen provided by the embodiment of the invention can be applied to the touch screens. The following description will take the example that the driving method of the touch screen provided by the embodiment of the invention is applied to a self-capacitance touch screen.
As shown in fig. 3, a method for driving a touch screen according to an embodiment of the present invention may include the following steps:
s301, in a touch stage within one frame time, loading a touch driving signal with a frequency which is not within a sound frequency range most sensitive to human ears to each touch electrode in the touch screen according to a preset condition, and judging a touch position by detecting a capacitance value change of each touch electrode.
And S302, controlling the touch screen to display the picture in the display stage within one frame time.
According to the driving method provided by the embodiment of the invention, the touch screen is controlled to display the picture in the display stage within one frame time, so that the touch screen realizes the picture display function. In a touch control stage within one frame time, a touch control driving signal with a frequency which is not within a sound frequency range most sensitive to human ears is loaded to each touch control electrode in the touch screen, so that the stretching change frequency of a film layer in the touch screen can deviate from the sound frequency most sensitive to human ears, the howling level is reduced, and the application reliability of the touch screen is improved. And the touch position is judged by detecting the capacitance value change of each touch electrode, so that the touch screen realizes the touch function.
A transparent conductive layer used as a common (VCOM) electrode on a touch panel is generally divided into several blocks to serve as touch electrodes. In a specific implementation, in a display stage within one frame time, controlling the touch screen to display a picture may include: and in a display stage within one frame time, loading a common voltage signal with a fixed voltage value to the touch electrode to control the touch screen to display a picture. The specific implementation thereof may be the same as that in the prior art, and will not be described herein. Moreover, determining the touch position by detecting the capacitance value of each touch electrode may also be the same as that in the prior art, and is not described herein again.
The refresh frequency of a typical Touch screen may include 60Hz, and if there are 12 Touch phases Touch within one frame time, the frequency of the Touch driving signal may be 720 Hz; if there are 14 Touch phases within one frame time, the frequency of the Touch driving signal may be 840Hz, and the rest may be similar, which is not described herein. Since the frequency range of sound to which the human ear is most sensitive is 1kHz to 3kHz, and higher frequencies result in higher power consumption. Therefore, in the embodiment of the present invention, the frequency of the touch driving signal can be made smaller than the minimum frequency in the frequency range of the sound to which the human ear is most sensitive. The frequency of the touch driving signal can be made to be less than 1kHz, so that the howling level of the display screen can be reduced, and the power consumption of the touch driving IC can be made to be smaller.
Generally, the electrostrictive effect is generated along with the touch driving signal which appears periodically, so that the adverse effect caused by the electrostrictive effect can be reduced after the periodic signal changes. Therefore, in the driving method provided by the embodiment of the present invention, loading the touch driving signal to each touch electrode in the touch screen according to the preset condition can be implemented by the following methods.
In specific implementation, in the embodiment of the present invention, the loading of the touch driving signal to each touch electrode in the touch screen according to the preset condition may specifically include:
in a touch control stage in a frame time, touch control driving signals with the same pulse number are loaded on the touch control electrodes in the same row, and touch control driving signals with different pulse numbers are loaded on the touch control electrodes in at least two rows. In particular, when the touch screen is a self-capacitance touch screen, it may include several block-shaped driving electrodes arranged in a matrix. Specifically, referring to fig. 1a, for example, the display screen includes 8 rows of touch electrodes L _1 to L _8, in one touch stage within one frame time, the L _1 row of touch electrodes may be loaded with touch driving signals with a pulse number of 6, and the L _2 to L _8 rows of touch electrodes may be loaded with touch driving signals with a pulse number of 5. Alternatively, the L _4 columns of touch electrodes may be loaded with touch driving signals with the number of pulses of 6, and the L _1 to L _3 and L _5 to L _8 columns of touch electrodes may be loaded with touch driving signals with the number of pulses of 5. Alternatively, the touch driving signals with the number of pulses of 6 may be applied to the L _1 row of touch electrodes, the touch driving signals with the number of pulses of 5 may be applied to the L _2 to L _3 rows of touch electrodes, and the touch driving signals with the number of pulses of 4 may be applied to the L _4 to L _8 rows of touch electrodes, which is not limited herein. Therefore, periodic touch driving signals of the touch screen in one touch stage are different, so that the film layers where the source and drain electrodes are located are different in stretching change caused by an electrostrictive effect in one touch stage, the stretching change of different areas in the film layers where the source and drain electrodes are located is different, vibration of the film layers is disturbed, and the howling level is reduced.
In specific implementation, at least two adjacent columns of touch electrodes in the touch screen may be divided into 1 column group. The touch screen display device can be divided into 1 column group, namely the column group comprises the 1 st column of touch electrodes to the last 1 column of touch electrodes in the touch screen. Alternatively, the number of column groups may be 2, 3, 4 …, etc., and is not limited herein.
Specifically, when the number of column groups is not less than 2, the number of touch electrodes included in some column groups may be different, and the number of touch electrodes included in some column groups may be the same. For example, referring to fig. 1a, taking an example that the display panel includes 8 rows of touch electrodes L _1 to L _8, two adjacent rows of touch electrodes L _1 and L _2 may be divided into a 1 st column group, three adjacent rows of touch electrodes L _3 to L _5 may be divided into a 2 nd column group, and three adjacent rows of touch electrodes L _6 to L _8 may be divided into a 3 rd column group. The rest can be analogized in turn, and the description is omitted here.
Of course, the number of touch electrodes included in each column group may be the same. For example, as shown in fig. 1a, two adjacent columns of touch electrodes L _1 and L _2 may be divided into a 1 st column group, two adjacent columns of touch electrodes L _3 and L _4 may be divided into a 2 nd column group, two adjacent columns of touch electrodes L _5 and L _6 may be divided into a 3 rd column group, and two adjacent columns of touch electrodes L _7 and L _8 may be divided into a 4 th column group. Or, the adjacent four rows of touch electrodes L _1 to L _4 may be divided into the 1 st column group, the adjacent four rows of touch electrodes L _5 to L _8 may be divided into the 2 nd column group, and the rest may be analogized in sequence, which is not described herein again.
In a specific implementation, when at least two adjacent rows of touch electrodes in the touch screen are divided into 1 column group, in an implementation provided by the present invention, the loading, to the touch electrodes in the same row, touch driving signals with the same number of pulses, and the loading, to the touch electrodes in at least two rows, touch driving signals with different numbers of pulses may specifically include: in the direction pointing to the last 1 column of touch electrodes along the 1 st column of touch electrodes, sequentially loading a touch driving signal with the decreasing pulse number to each column of touch electrodes in a part of column groups, and sequentially loading a touch driving signal with the increasing pulse number to each column of touch electrodes in the rest part of column groups.
Since the touch electrodes in the touch screen may be divided into a plurality of column groups, when the touch electrodes are divided into 2 column groups, in the direction F1 pointing to the L _8 column touch electrodes along the L _1 column touch electrodes, a touch driving signal with decreasing pulse number may be sequentially applied to each column touch electrode in 1 column group, and a touch driving signal with increasing pulse number may be sequentially applied to each column touch electrode in the other 1 column group. Referring to fig. 1a and 4, L _1 to L _4 may be divided into 1 st column group, and L _5 to L _8 may be divided into 2 nd column group. In the direction F1, the touch driving signals with decreasing pulse number are sequentially applied to each of the touch electrodes L _1 to L _4 in the 1 st column group, and the touch driving signals with increasing pulse number are sequentially applied to each of the touch electrodes L _5 to L _8 in the 2 nd column group. Specifically, the touch driving signals L _1 and L _8 with 6 pulse signals may be applied to the rows L _1 and L _8 of touch electrodes, the touch driving signals L _2 and L _7 with 5 pulse signals may be applied to the rows L _2 and L _7 of touch electrodes, the touch driving signals L _3 and L _6 with 4 pulse signals may be applied to the rows L _3 and L _6 of touch electrodes, and the touch driving signals L _4 and L _5 with 3 pulse signals may be applied to the rows L _4 and L _5 of touch electrodes. Of course, the number of the pulse signals of the loaded touch driving signal may also be other values, which need to be designed and determined according to the actual application environment, and is not limited herein.
Alternatively, the touch panel may be divided into 3 column groups, and in the direction F1 in which the L _1 column touch electrodes point to the L _8 column touch electrodes, the touch driving signals with decreasing pulse number may be sequentially applied to each column touch electrode in 1 column group, and the touch driving signals with increasing pulse number may be sequentially applied to each column touch electrode in the other 2 column groups. Referring to fig. 1a and 5, L _1 to L _2 may be divided into 1 st column group, L _3 to L _5 may be divided into 2 nd column group, and L _6 to L _8 may be divided into 3 rd column group, in a direction F1, a touch driving signal L _1 with 6 pulse signals may be applied to the L _1 column touch electrodes, a touch driving signal L _2 with 5 pulse signals may be applied to the L _2 column touch electrodes, a touch driving signal L _3 with 3 pulse signals may be applied to the L _3 column touch electrodes, a touch driving signal L _4 with 4 pulse signals may be applied to the L _4 column touch electrodes, a touch driving signal L _1 with 5 pulse signals may be applied to the L _5 column touch electrodes, a touch driving signal L _6 with 4 pulse signals may be applied to the L _6 column touch electrodes, and a touch driving signal L _7 with 5 pulse signals may be applied to the L _7 column touch electrodes, and loading a touch driving signal L _8 with 6 pulse signals to the L _8 columns of touch electrodes. Of course, the method can also be divided into 4, 5, 6 and other numerical column groups, and so on, which are not described herein again.
In a specific implementation, when at least two adjacent rows of touch electrodes in the touch screen are divided into 1 column group, in another embodiment provided by the present invention, the loading of touch driving signals with the same number of pulses to the touch electrodes in the same row, and the loading of touch driving signals with different numbers of pulses to the touch electrodes in different rows may specifically include: and sequentially loading a touch driving signal with the pulse number decreasing in the direction of pointing the 1 st row of touch electrodes to the last 1 row of touch electrodes to each row of touch electrodes in each column group. Specifically, when dividing into 2 column groups, as shown in fig. 1a and fig. 6, L _1 to L _4 may be divided into 1 st column group, and L _5 to L _8 may be divided into 2 nd column group. In the direction F1, L _1 and L _5 column touch electrodes may be respectively applied with touch driving signals L _1 and L _5 having 6 pulse signals, L _2 and L _6 column touch electrodes may be respectively applied with touch driving signals L _2 and L _6 having 5 pulse signals, L _3 and L _7 column touch electrodes may be respectively applied with touch driving signals L _3 and L _7 having 4 pulse signals, and L _4 and L _8 column touch electrodes may be respectively applied with touch driving signals L _4 and L _8 having 3 pulse signals. Of course, the number of the pulse signals of the loaded touch driving signal may also be other values, which need to be designed and determined according to the actual application environment, and is not limited herein.
Alternatively, when dividing into 3 column groups, as shown in fig. 1a and 7, L _1 to L _2 may be divided into 1 st column group, L _3 to L _5 may be divided into 2 nd column group, and L _6 to L _8 may be divided into 3 rd column group. In the direction F1, a touch driving signal L _1 with 6 pulse signals may be applied to the L _1 column of touch electrodes, a touch driving signal L _2 with 5 pulse signals may be applied to the L _2 column of touch electrodes, a touch driving signal L _3 with 6 pulse signals may be applied to the L _3 column of touch electrodes, a touch driving signal L _4 with 5 pulse signals may be applied to the L _4 column of touch electrodes, a touch driving signal L _5 with 4 pulse signals may be applied to the L _5 column of touch electrodes, a touch driving signal L _6 with 5 pulse signals may be applied to the L _6 column of touch electrodes, a touch driving signal L _7 with 4 pulse signals may be applied to the L _7 column of touch electrodes, and a touch driving signal L _8 with 3 pulse signals may be applied to the L _8 column of touch electrodes. Of course, the number of the pulse signals of the loaded touch driving signal may also be other values, which need to be designed and determined according to the actual application environment, and is not limited herein.
In a specific implementation, when at least two adjacent rows of touch electrodes in the touch screen are divided into 1 column group, in another embodiment provided by the present invention, the loading, to the touch electrodes in the same row, touch driving signals with the same pulse number, and the loading, to the touch electrodes in different rows, touch driving signals with different pulse numbers may specifically include: and sequentially loading touch driving signals with the pulse number increasing number to each row of touch electrodes in each column group in the direction of pointing the 1 st row of touch electrodes to the last 1 row of touch electrodes. Specifically, when dividing into 2 column groups, as shown in fig. 1a and 8, L _1 to L _4 may be divided into 1 st column group and L _5 to L _8 may be divided into 2 nd column group. In the direction F1, L _1 and L _5 column touch electrodes may be respectively applied with touch driving signals L _1 and L _5 having 3 pulse signals, L _2 and L _6 column touch electrodes may be respectively applied with touch driving signals L _2 and L _6 having 4 pulse signals, L _3 and L _7 column touch electrodes may be respectively applied with touch driving signals L _3 and L _7 having 5 pulse signals, and L _4 and L _8 column touch electrodes may be respectively applied with touch driving signals L _4 and L _8 having 6 pulse signals. Of course, the number of the pulse signals of the loaded touch driving signal may also be other values, which need to be designed and determined according to the actual application environment, and is not limited herein.
Alternatively, when dividing into 3 column groups, as shown in fig. 1a and 9, L _1 to L _2 may be divided into 1 st column group, L _3 to L _5 may be divided into 2 nd column group, and L _6 to L _8 may be divided into 3 rd column group. In the direction F1, a touch driving signal L _1 with 5 pulse signals may be applied to the L _1 column of touch electrodes, a touch driving signal L _2 with 6 pulse signals may be applied to the L _2 column of touch electrodes, a touch driving signal L _3 with 4 pulse signals may be applied to the L _3 column of touch electrodes, a touch driving signal L _4 with 5 pulse signals may be applied to the L _4 column of touch electrodes, a touch driving signal L _5 with 6 pulse signals may be applied to the L _5 column of touch electrodes, a touch driving signal L _6 with 3 pulse signals may be applied to the L _6 column of touch electrodes, a touch driving signal L _7 with 4 pulse signals may be applied to the L _7 column of touch electrodes, and a touch driving signal L _8 with 8 pulse signals may be applied to the L _8 column of touch electrodes. Of course, the number of the pulse signals of the loaded touch driving signal may also be other values, which need to be designed and determined according to the actual application environment, and is not limited herein.
In general, display and touch in a touch screen are time-sharing driven, so that a frame time may include N touch phases, and at this time, a frame time may further include N +1 display phases. Thus, N touch control stages can be inserted in the process of scanning the pixels in the display screen line by line. Where N may be 2, and at this time, a frame time may include 2 touch phases, so that when the refresh frequency of the touch screen is 60Hz, the frequency of the touch driving signal may be 120 Hz. Of course, N and may also be 3, 4, etc., and so on, which are not described herein.
The influence of the electrostrictive effect can be reduced by reducing the touch phases which occur periodically. In particular implementations, the refresh frequency of the touch screen may be xHz; a frame time may include N touch phases; wherein N is greater than or equal to 1 and less than or equal to
Figure BDA0001674182140000111
Is an integer of (1). In an embodiment of the present invention, loading a touch driving signal to each touch electrode in the touch screen according to a preset condition may specifically include:
loading touch driving signals with the same pulse number to each touch electrode in each touch stage within one frame time; the pulse number of the touch driving signals is y times of the pulse number of default touch driving signals prestored in the touch screen; y is an integer greater than or equal to 2. Here, y may be 1, and at this time, the number of pulses of the touch driving signal is 1 time of the number of pulses of the default touch driving signal stored in advance in the touch screen. Alternatively, y may be 2, and in this case, the number of pulses of the touch driving signal may be 2 times the number of pulses of the default touch driving signal stored in advance in the touch panel. Of course, when y is equal to 3, 4, 5, etc., the description is omitted here.
In a specific implementation, the default touch driving signal may be a touch display device that has been shipped from a factory at present, for example, a default touch driving signal stored in a mobile phone. Moreover, the number of pulses of the default touch driving signal is preset, which may be substantially the same as that in the prior art, and is not described herein again.
Typical refresh rates for touch screens may include 60Hz or 120 Hz. At a refresh rate of 60Hz,
Figure BDA0001674182140000121
at this time, if there are 16 Touch phases within one frame time, the frequency of the Touch driving signal may be 960 Hz; if there are 14 Touch phases within one frame time, the frequency of the Touch driving signal may be 840 Hz; if there are 12 Touch phases within one frame time, the frequency of the Touch driving signal may be 720 Hz; that is, the less Touch phases Touch are provided in one frame time, the smaller the frequency of the Touch driving signal can be. Therefore, in practical implementation, when the refresh frequency can be 60Hz, i.e., x is 60, 1. ltoreq. N.ltoreq.6 can be used. Further, in order to reduce the electrostrictive effect and improve the touch accuracy, x may be 60, N may be 2, and y may be 3. Taking the default number of pulses of the Touch driving signal as 2 as an example, as shown in fig. 10, when the refresh frequency may be 60Hz, there are 2 Touch phases within one frame time, and the number of pulses of the Touch driving signal in each Touch phase is 6.
When the refresh frequency can be 120Hz, i.e., x is 120, 1N 4 can be made. Further, in order to reduce the electrostrictive effect and improve the Touch accuracy, x may be 120, N may be 2, and y may be 3, that is, when the refresh frequency may be 120Hz, there are 2 Touch phases Touch within one frame time, and the number of pulses of the Touch driving signal in each Touch phase is 3 times the number of pulses of the default Touch driving signal stored in advance in the Touch screen.
In general, display and touch in a touch screen are time-sharing driven, so that when a frame time includes N touch phases, the frame time may further include N +1 display phases. Thus, N touch control stages can be inserted in the process of scanning the pixels in the display screen line by line.
The periodic touch driving signals can be prevented from appearing by disordering the periodic touch driving signals, that is, randomly designing the time points of the touch stage within a frame time.
In specific implementation, the driving method provided in the embodiment of the present invention may further include: and controlling the touch control stages with the same occurrence frequency in one frame time to have different occurrence time points in two adjacent frame times. Therefore, touch driving signals which appear periodically can be disordered, so that touch stages with the same occurrence frequency do not appear at the same time point in two adjacent frames, and the influence of the electrostrictive effect can be better reduced.
Specifically, for a touch stage that occurs the same number of times within one frame time, the touch stage may occur at a time point that is earlier in the 1 st frame time than in the 2 nd frame time of the two consecutive frame times.
For example, referring to fig. 1c and fig. 11, taking 6 Touch phases Touch and 7 Display phases Display in one Frame time as an example, the Frame1 represents the signal loaded on the Touch electrode in the first Frame time of two adjacent Frame times, and the Frame2 represents the signal loaded on the Touch electrode in the second Frame time of two adjacent Frame times. Loading a Touch driving signal to the Touch electrode in Touch stages within a first frame time, and loading a common voltage signal with a fixed voltage value to the Touch electrode in Display stages; and loading a Touch driving signal to the Touch electrode in each Touch stage Touch in the second frame time, and loading a common voltage signal with a fixed voltage value to the Touch electrode in each Display stage Display.
For the working process of the touch screen in the first frame time, the method specifically includes: the Display stage 1 is entered first, at this time, a common voltage signal is input to the touch electrode, and at this time, the row 1 pixels are scanned, that is, a gate scanning signal is input to the gate line gate _1, and the thin film transistors in the row 1 pixels are controlled to be turned on to input a data signal to the pixel electrodes. And then, entering a 1 st Touch control stage Touch, inputting a Touch control driving signal to the Touch control electrode at the moment, and stopping scanning the pixels.
After Touch of the 1 st Touch stage is completed, the Display of the 2 nd Display stage is started, a common voltage signal is input to the Touch electrode, and the pixels of the 2 nd to 4 th rows are scanned sequentially, namely gate scanning signals are input to the gate lines gate _2 to gate _4 sequentially, and the thin film transistors in the pixels of the 2 nd to 4 th rows are controlled to be opened so as to input data signals to the pixel electrode. And then entering a 2 nd Touch control stage Touch, inputting a Touch control driving signal to the Touch control electrode at the moment, and stopping scanning the pixels.
After the Touch stage 2 is completed, the Display stage 3 is entered, at this time, a common voltage signal is input to the Touch electrode, and at this time, the pixels in the row 5 and the pixels in the row 6 are scanned in sequence, that is, gate scanning signals are input to the gate lines gate _5 and gate _6 in sequence, and the thin film transistors in the pixels in the row 5 and the row 6 are controlled to be turned on to input data signals to the pixel electrode. And then entering a 3 rd Touch control stage Touch, inputting a Touch control driving signal to the Touch control electrode at the moment, and stopping scanning the pixels.
After the Touch control stage Touch of the 3 rd row is completed, the Display stage Display of the 4 th row is started, a common voltage signal is input to the Touch control electrode at the moment, pixels of the 7 th to 10 th rows are scanned sequentially at the moment, namely, gate scanning signals are input to the gate lines gate _7 to gate _10 sequentially, and thin film transistors in the pixels of the 7 th to 10 th rows are controlled to be opened so as to input data signals to the pixel electrode. And then entering a 4 th Touch control stage Touch, inputting a Touch control driving signal to the Touch control electrode at the moment, and stopping scanning the pixels.
After finishing Touch control at the 4 th Touch control stage, entering Display at the 5 th Display stage, inputting a common voltage signal to the Touch control electrode, scanning the pixels at the 11 th to 13 th rows in sequence, namely inputting a grid scanning signal to the grid lines gate _11 to gate _13 in sequence, and controlling the thin film transistors in the pixels at the 11 th to 13 th rows to be opened so as to input a data signal to the pixel electrode. And then entering a 5 th Touch control stage Touch, inputting a Touch control driving signal to the Touch control electrode at the moment, and stopping scanning the pixels.
After the 5 th Touch phase Touch is completed, the Display stage is entered, at this time, a common voltage signal is input to the Touch electrode, and at this time, the 14 th row of pixels and the 15 th row of pixels are scanned in sequence, that is, gate scanning signals are input to the gate lines gate _14 and gate _15 in sequence, and the thin film transistors in the 14 th row of pixels and the 15 th row of pixels are controlled to be turned on to input data signals to the pixel electrode. And then entering a 6 th Touch control stage Touch, inputting a Touch control driving signal to the Touch control electrode at the moment, and stopping scanning the pixels.
After the Touch control stage 6 is completed, the Display stage 7 is entered, at this time, a common voltage signal is input to the Touch control electrode, and at this time, the pixels in the rows 16 to 18 are scanned in sequence, that is, gate scanning signals are input to the gate lines gate _16 to gate _18, and the thin film transistors in the pixels in the rows 16 to 18 are controlled to be turned on to input data signals to the pixel electrodes. Therefore, the touch screen can complete the display and touch functions in the first frame time through the process.
For the working process of the touch screen in the second frame time, the following specific steps may be performed: the Display stage 1 is entered first, at this time, a common voltage signal is input to the touch electrode, and at this time, the pixels in the rows 1 and 2 are scanned in sequence, that is, gate scanning signals are input to the gate lines gate _1 and gate _2 in sequence, and the thin film transistors in the pixels in the rows 1 and 2 are controlled to be turned on in sequence to input data signals to the pixel electrodes. And then, entering a 1 st Touch control stage Touch, inputting a Touch control driving signal to the Touch control electrode at the moment, and stopping scanning the pixels.
After Touch of the 1 st Touch stage is completed, the Display of the 2 nd Display stage is started, a common voltage signal is input to the Touch electrode, the 3 rd to 5 th rows of pixels are scanned sequentially, namely, gate scanning signals are input to the gate lines gate _3 to gate _5 sequentially, and the thin film transistors in the 3 rd to 5 th rows of pixels are controlled to be turned on so as to input data signals to the pixel electrode. And then entering a 2 nd Touch control stage Touch, inputting a Touch control driving signal to the Touch control electrode at the moment, and stopping scanning the pixels.
After the Touch control stage 2 is completed, the Display stage 3 is entered, at this time, a common voltage signal is input to the Touch control electrode, and at this time, the pixels in the rows 6 to 9 are scanned in sequence, that is, gate scanning signals are input to the gate lines gate _6 to gate _9 in sequence, and the thin film transistors in the pixels in the rows 6 to 9 are controlled to be turned on to input data signals to the pixel electrode. And then entering a 3 rd Touch control stage Touch, inputting a Touch control driving signal to the Touch control electrode at the moment, and stopping scanning the pixels.
After the 3 rd Touch phase Touch is completed, the Display phase 4 is entered, at this time, a common voltage signal is input to the Touch electrode, and at this time, the pixels in the 10 th and 11 th rows are scanned sequentially, that is, gate scanning signals are input to the gate lines gate _10 and gate _11 sequentially, and the thin film transistors in the pixels in the 10 th and 11 th rows are controlled to be turned on to input data signals to the pixel electrodes. And then entering a 4 th Touch control stage Touch, inputting a Touch control driving signal to the Touch control electrode at the moment, and stopping scanning the pixels.
After finishing Touch control at the 4 th Touch control stage, entering Display at the 5 th Display stage, inputting a common voltage signal to the Touch control electrode, scanning pixels at the 12 th to 14 th rows in sequence, namely inputting a grid scanning signal to the grid lines gate _12 to gate _14 in sequence, and controlling thin film transistors in the pixels at the 12 th to 14 th rows to be opened so as to input a data signal to the pixel electrode. And then entering a 5 th Touch control stage Touch, inputting a Touch control driving signal to the Touch control electrode at the moment, and stopping scanning the pixels.
After the Touch control stage of 5 is completed, the Display stage of 6 is entered, at this time, a common voltage signal is input to the Touch control electrode, and at this time, the pixels of the rows 15 to 17 are scanned in sequence, that is, gate scanning signals are input to the gate lines gate _15 to gate _17 in sequence, and the thin film transistors in the pixels of the rows 15 to 17 are controlled to be turned on to input data signals to the pixel electrode. And then entering a 6 th Touch control stage Touch, inputting a Touch control driving signal to the Touch control electrode at the moment, and stopping scanning the pixels.
After the Touch phase 6 is completed, the Display phase 7 is entered, at which time a common voltage signal is input to the Touch electrodes, and at this time, the pixels in the row 18 are scanned, i.e., a gate scan signal is input to the gate line gate _18, and the tfts in the pixels in the row 18 are controlled to be turned on to input data signals to the pixel electrodes. Therefore, the touch screen can complete the display and touch functions in the second frame time through the process.
Therefore, it can be seen that for the Touch phase Touch appearing for the 1 st time within one frame time, the time point of the Touch phase Touch appearing within the first frame time is earlier than the time point of the Touch phase Touch appearing at the second frame time. Similarly, for Touch phases Touch appearing 2, 3, 4, 5, and 6 times in one frame time, the time point of the Touch phase Touch appearing in the first frame time is earlier than the time point of the Touch phase Touch appearing in the second frame time. When there are other number of Touch phases within one frame time, the process is repeated in the same way, and details are not described herein.
Or, for a touch phase with the same number of occurrences within one frame time, the touch phase may occur later in the 1 st frame time than in the 2 nd frame time. For example, referring to fig. 12, taking 6 Touch phases Touch and 7 Display phases Display in one Frame time as an example, the Frame1 represents a signal loaded on the Touch electrode in the first Frame time of two adjacent Frame times, and the Frame2 represents a signal loaded on the Touch electrode in the second Frame time of two adjacent Frame times. Loading a Touch driving signal to the Touch electrode in Touch stages within a first frame time, and loading a common voltage signal with a fixed voltage value to the Touch electrode in Display stages; and loading a Touch driving signal to the Touch electrode in each Touch stage Touch in the second frame time, and loading a common voltage signal with a fixed voltage value to the Touch electrode in each Display stage Display. At this time, the principle of the display and touch functions of the touch screen realized in the first frame time and the second frame time is basically the same as the principle corresponding to fig. 11, and reference may be specifically made to the working process of the touch screen corresponding to fig. 11, which is not described herein again. Similarly, it can be seen that, for the Touch phase Touch appearing for the 1 st time within one frame time, the Touch phase Touch appears later in the first frame time than in the second frame time. Similarly, for Touch phases Touch appearing 2, 3, 4, 5, and 6 times in one frame time, the time point of the Touch phase Touch appearing in the first frame time is later than the time point of the Touch phase Touch appearing in the second frame time. When there are other number of Touch phases within one frame time, the process is repeated in the same way, and details are not described herein.
Of course, for a touch stage with the same number of occurrences in one frame time, the touch stage may occur in the 1 st frame time of the two consecutive frame times before the touch stage occurs in the 2 nd frame time. For the rest touch phases with the same occurrence frequency in one frame time, the time point of the touch phase occurring in the 1 st frame time of the two consecutive frame times can be made to be later than the time point of the touch phase occurring in the 2 nd frame time. For example, referring to fig. 13, taking 6 Touch phases and 7 Display phases in one Frame time as an example, the Frame1 represents a signal loaded on the Touch electrode in a first Frame time of two adjacent Frame times, and the Frame2 represents a signal loaded on the Touch electrode in a second Frame time of two adjacent Frame times. Loading a Touch driving signal to the Touch electrode in Touch stages within a first frame time, and loading a common voltage signal with a fixed voltage value to the Touch electrode in Display stages; and loading a Touch driving signal to the Touch electrode in each Touch stage Touch in the second frame time, and loading a common voltage signal with a fixed voltage value to the Touch electrode in each Display stage Display. At this time, the principle of the display and touch functions of the touch screen realized in the first frame time and the second frame time is basically the same as the principle corresponding to fig. 11, and reference may be specifically made to the working process of the touch screen corresponding to fig. 11, which is not described herein again. And, it can be seen from the same reason that, for the Touch phase Touch appearing at the 1 st time in one frame time, the time point of the Touch phase Touch appearing in the first frame time is earlier than the time point of the Touch phase Touch appearing in the second frame time. Similarly, for Touch phases Touch appearing 2 and 3 times in one frame time, the time point of the Touch phase Touch appearing in the first frame time is earlier than the time point of the Touch phase Touch appearing in the second frame time. For the Touch phase Touch appearing at the 4 th time in one frame time, the time point of the Touch phase Touch appearing in the first frame time is later than the time point of the Touch phase Touch appearing in the second frame time. Similarly, for the Touch phases Touch appearing 5 and 6 times in one frame time, the time point of the Touch phase Touch appearing in the first frame time is later than the time point of the Touch phase Touch appearing in the second frame time. When there are other number of Touch phases within one frame time, the process is repeated in the same way, and details are not described herein.
In order to further reduce the influence of the electrostrictive effect, in a specific implementation, in one touch stage within one frame time, touch driving signals with the same number of pulses may be loaded to the touch electrodes in the same row, and touch driving signals with different numbers of pulses may be loaded to the touch electrodes in different rows. For specific implementation, reference may be made to the above embodiments, which are not described herein in detail.
In order to further reduce the effect of the electrostrictive effect, in an implementation, N touch phases may be included in one frame time. In each touch control stage, touch control driving signals with the same number of pulses can be loaded on each touch control electrode. Furthermore, the pulse number of the touch driving signal can be y times of the pulse number of a default touch driving signal pre-stored in the touch screen; y is an integer greater than or equal to 2. For specific implementation, reference may be made to the above embodiments, which are not described herein in detail.
It should be noted that, the specific value of the number of pulses of the touch driving signal mentioned in the embodiment of the present invention is only to better describe the content of the present invention, and the specific value of the number of pulses needs to be designed and determined according to the actual application environment, and is not limited herein.
Based on the same inventive concept, an embodiment of the present invention further provides a driving apparatus for a touch screen, as shown in fig. 14, which may include:
the touch driving unit 210 is configured to, in a touch stage within one frame time, load, according to a preset condition, a touch driving signal having a frequency that is not within a sound frequency range to which human ears are most sensitive to each touch electrode in the touch screen 230, and determine a touch position by detecting a change in a capacitance value of each touch electrode;
the display driving unit 220 is configured to control the touch screen 230 to display a picture in a display phase within one frame time.
The driving device provided by the embodiment of the invention controls the touch screen to display the picture in the display stage within one frame time, so that the touch screen realizes the picture display function. In a touch control stage within one frame time, a touch control driving signal with a frequency which is not within a sound frequency range most sensitive to human ears is loaded to each touch control electrode in the touch screen, so that the stretching change frequency of a film layer in the touch screen can deviate from the sound frequency most sensitive to human ears, the howling level is reduced, and the application reliability of the touch screen is improved. And the touch position is judged by detecting the capacitance value change of each touch electrode, so that the touch screen realizes the touch function.
In a specific implementation, in the embodiment of the present invention, the display driving unit may be specifically configured to load a common voltage signal with a fixed voltage value to the touch electrode in a display stage within one frame time, so as to control the touch screen to display a picture.
In practical implementation, in the embodiment of the present invention, the frequency of the touch driving signal is smaller than the minimum frequency in the frequency range of the sound to which the human ear is most sensitive. Therefore, the howling level of the display screen can be reduced, and the power consumption of the touch drive IC can be reduced.
In a specific implementation, in the embodiment of the present invention, the touch driving unit may be specifically configured to load the touch electrodes in the same row with the touch driving signals with the same number of pulses in one touch stage within one frame time, and load the touch electrodes in at least two rows with the touch driving signals with different numbers of pulses. Therefore, in a touch control stage in one frame time, touch control driving signals with different pulse numbers are loaded on the touch control electrodes in different rows, so that periodic touch control driving signals appearing in different rows can be different, the stretching changes of the film layer generated by an electrostrictive effect in the touch control stage are different, the stretching changes of different areas in the film layer are different, the vibration of the film layer is disturbed, and the howling level is reduced.
In specific implementation, in the embodiment of the present invention, at least two adjacent rows of touch electrodes in the touch screen may be divided into 1 column group. The touch screen display device can be divided into 1 column group, namely the column group comprises the 1 st column of touch electrodes to the last 1 column of touch electrodes in the touch screen. Alternatively, the number of column groups may be 2, 3, 4 …, etc., and is not limited herein.
In a specific implementation, in the embodiment of the present invention, the touch driving unit may be specifically configured to sequentially load the touch driving signals with decreasing pulse numbers to each of the touch electrodes in a part of the column groups in a direction along the 1 st column of the touch electrodes toward the last 1 st column of the touch electrodes, and sequentially load the touch driving signals with increasing pulse numbers to each of the touch electrodes in the other part of the column groups. Further, the column group may be 2; the touch driving unit is specifically configured to sequentially load, in a direction pointing to the last 1 row of touch electrodes along the 1 st row of touch electrodes, touch driving signals with decreasing pulse numbers to each row of touch electrodes in the 1 st row group in the 2 row groups, and sequentially load, in the direction pointing to the last 1 row of touch electrodes, touch driving signals with increasing pulse numbers to each row of touch electrodes in the 2 nd row group. Referring to fig. 1a and 4, L _1 to L _4 may be divided into 1 st column group, and L _5 to L _8 may be divided into 2 nd column group. In the direction F1, the touch driving signals with decreasing pulse number are sequentially applied to each of the touch electrodes L _1 to L _4 in the 1 st column group, and the touch driving signals with increasing pulse number are sequentially applied to each of the touch electrodes L _5 to L _8 in the 2 nd column group. Specifically, the touch driving signals L _1 and L _8 with 6 pulse signals may be applied to the rows L _1 and L _8 of touch electrodes, the touch driving signals L _2 and L _7 with 5 pulse signals may be applied to the rows L _2 and L _7 of touch electrodes, the touch driving signals L _3 and L _6 with 4 pulse signals may be applied to the rows L _3 and L _6 of touch electrodes, and the touch driving signals L _4 and L _5 with 3 pulse signals may be applied to the rows L _4 and L _5 of touch electrodes. Of course, the number of the pulse signals of the loaded touch driving signal may also be other values, which need to be designed and determined according to the actual application environment, and is not limited herein.
In practical implementation, in the embodiment of the present invention, the touch driving unit is specifically configured to sequentially load the touch driving signals with decreasing pulse number to each row of the touch electrodes in each column group in a direction along the 1 st row of the touch electrodes toward the last 1 st row of the touch electrodes. Further, when dividing into 2 column groups, as shown in fig. 1a and fig. 6, L _1 to L _4 may be divided into 1 st column group, and L _5 to L _8 may be divided into 2 nd column group. In the direction F1, L _1 and L _5 column touch electrodes may be respectively applied with touch driving signals L _1 and L _5 having 6 pulse signals, L _2 and L _6 column touch electrodes may be respectively applied with touch driving signals L _2 and L _6 having 5 pulse signals, L _3 and L _7 column touch electrodes may be respectively applied with touch driving signals L _3 and L _7 having 4 pulse signals, and L _4 and L _8 column touch electrodes may be respectively applied with touch driving signals L _4 and L _8 having 3 pulse signals. Of course, the number of the pulse signals of the loaded touch driving signal may also be other values, which need to be designed and determined according to the actual application environment, and is not limited herein.
In practical implementation, in the embodiment of the present invention, the touch driving unit may also be specifically configured to sequentially load the touch driving signals with increasing pulse numbers to each row of the touch electrodes in each column group in a direction along the 1 st row of the touch electrodes toward the last 1 st row of the touch electrodes. Further, when dividing into 2 column groups, as shown in fig. 1a and fig. 6, L _1 to L _4 may be divided into 1 st column group, and L _5 to L _8 may be divided into 2 nd column group. In the direction F1, L _1 and L _5 column touch electrodes may be respectively applied with touch driving signals L _1 and L _5 having 6 pulse signals, L _2 and L _6 column touch electrodes may be respectively applied with touch driving signals L _2 and L _6 having 5 pulse signals, L _3 and L _7 column touch electrodes may be respectively applied with touch driving signals L _3 and L _7 having 4 pulse signals, and L _4 and L _8 column touch electrodes may be respectively applied with touch driving signals L _4 and L _8 having 3 pulse signals. Of course, the number of the pulse signals of the loaded touch driving signal may also be other values, which need to be designed and determined according to the actual application environment, and is not limited herein.
In particular implementations, the refresh frequency of the touch screen may be xHz; a frame time may include N touch phases; wherein N is greater than or equal to 1 and less than or equal to
Figure BDA0001674182140000201
Is an integer of (1). In the embodiment of the present invention, the touch driving unit may be specifically configured to load the touch driving signals with the same number of pulses to each touch electrode in each touch stage within one frame time; the pulse number of the touch driving signals is y times of the pulse number of default touch driving signals prestored in the touch screen; y is an integer greater than or equal to 2.
In practical implementation, in an embodiment of the present invention, the driving device may further include: and the control driving unit is used for controlling the time points of the touch phases with the same occurrence frequency in one frame time to be different in two adjacent frame times. Therefore, the touch driving signals which appear periodically can be disordered, so that the touch driving signals in the touch stages with the same occurrence frequency do not appear at the same time point in two adjacent frames, and the influence of the electrostrictive effect can be better reduced.
In specific implementation, in the embodiment of the present invention, the touch driving unit, the display driving unit, and the control driving unit may be in the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Specifically, the touch driving unit and the control driving unit may be components in a touch driving IC. The display driving unit may be a component in the display driving IC. Further, the touch driving IC and the display driving IC may be the same driving IC, which may improve the IC integration.
Based on the same inventive concept, the embodiment of the invention also provides a display device, which comprises the driving device of the touch screen provided by the embodiment of the invention. The principle of the display device to solve the problem is similar to the driving device, so the implementation of the display device can be referred to the implementation of the driving device, and repeated details are not repeated herein.
In specific implementation, the display device provided by the embodiment of the invention further comprises a touch screen. The touch screen may include a self-capacitance touch screen or a mutual capacitance touch screen, which is not limited herein.
In specific implementation, the display device provided in the embodiment of the present invention may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the invention.
Based on the same inventive concept, embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps of any one of the above-mentioned methods for driving a touch screen provided by embodiments of the present invention. In particular, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
Based on the same inventive concept, an embodiment of the present invention further provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and running on the processor, and when the processor executes the computer program, the steps of any one of the above-mentioned methods for driving a touch screen provided by the embodiment of the present invention are implemented.
According to the driving method and the related device of the touch screen provided by the embodiment of the invention, the touch screen is controlled to display the picture in the display stage within one frame time, so that the touch screen realizes the picture display function. In a touch control stage within one frame time, a touch control driving signal with a frequency which is not within a sound frequency range most sensitive to human ears is loaded to each touch control electrode in the touch screen, so that the stretching change frequency of a film layer in the touch screen can deviate from the sound frequency most sensitive to human ears, the howling level is reduced, and the application reliability of the touch screen is improved. And the touch position is judged by detecting the capacitance value change of each touch electrode, so that the touch screen realizes the touch function.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (12)

1. A method of driving a touch screen, the method comprising:
in a touch control stage within one frame time, loading a touch control driving signal with a frequency which is not within a sound frequency range most sensitive to human ears to each touch control electrode in the touch screen according to a preset condition, and judging a touch control position by detecting capacitance value change of each touch control electrode; the frequency of the touch driving signal is smaller than the minimum frequency in the sound frequency range to which the human ear is most sensitive;
in a display stage within one frame time, controlling the touch screen to display a picture;
the loading of the touch driving signal to each touch electrode in the touch screen according to the preset condition specifically includes: in a touch control stage in a frame time, touch control driving signals with the same pulse number are loaded on touch control electrodes in the same row, and touch control driving signals with different pulse numbers are loaded on touch control electrodes in at least two rows;
at least two adjacent columns of touch electrodes in the touch screen are divided into 1 column group; the loading of the touch driving signals with the same number of pulses to the touch electrodes in the same row, and the loading of the touch driving signals with the different number of pulses to the touch electrodes in at least two rows specifically include: in the direction pointing to the last 1 column of touch electrodes along the 1 st column of touch electrodes, sequentially loading a touch driving signal with the decreasing pulse number to each column of touch electrodes in a part of column groups, and sequentially loading a touch driving signal with the increasing pulse number to each column of touch electrodes in the rest part of column groups.
2. The driving method according to claim 1, wherein the number of column groups is 2 column groups;
the sequentially loading the touch driving signals with the decreasing pulse number to each row of touch electrodes in the partial column groups, and sequentially loading the touch driving signals with the increasing pulse number to each row of touch electrodes in the rest partial column groups specifically includes:
in the direction pointing to the last 1 column of touch electrodes along the 1 st column of touch electrodes, sequentially loading a touch driving signal with decreasing pulse number to each column of touch electrodes in the 1 st column group in the 2 column groups, and sequentially loading a touch driving signal with increasing pulse number to each column of touch electrodes in the 2 nd column group.
3. As claimed inThe driving method of claim 1, wherein the refresh frequency of the touch screen is xHz; the frame time comprises N touch control stages; wherein N is greater than or equal to 1 and less than or equal to
Figure FDA0003098840980000021
An integer of (d);
the pulse number of the touch driving signals is y times of the pulse number of default touch driving signals prestored by the touch screen; y is an integer greater than or equal to 2.
4. The driving method as claimed in claim 3, wherein x is 60, N is 2, and y is 3.
5. The method according to any one of claims 1 to 4, wherein the driving method further comprises: and controlling the touch control stages with the same occurrence frequency in one frame time to have different occurrence time points in two adjacent frame times.
6. A driving apparatus of a touch screen, comprising:
the touch control driving unit is used for loading a touch control driving signal with a frequency which is not in a sound frequency range most sensitive to human ears to each touch control electrode in the touch screen according to a preset condition in a touch control stage within one frame time, and judging a touch control position by detecting capacitance value change of each touch control electrode; the frequency of the touch driving signal is smaller than the minimum frequency in the sound frequency range to which the human ear is most sensitive;
the display driving unit is used for controlling the touch screen to display a picture in a display stage within one frame time;
the touch driving unit is configured to, when a touch driving signal is loaded to each touch electrode in the touch screen according to a preset condition, specifically: in a touch control stage in a frame time, touch control driving signals with the same pulse number are loaded on touch control electrodes in the same row, and touch control driving signals with different pulse numbers are loaded on touch control electrodes in at least two rows;
at least two adjacent columns of touch electrodes in the touch screen are divided into 1 column group; the touch driving unit is used for loading touch driving signals with the same pulse number to the touch electrodes in the same row, and when the touch electrodes in at least two rows are loaded with touch driving signals with different pulse numbers, the touch driving unit is specifically used for: in the direction pointing to the last 1 column of touch electrodes along the 1 st column of touch electrodes, sequentially loading a touch driving signal with the decreasing pulse number to each column of touch electrodes in a part of column groups, and sequentially loading a touch driving signal with the increasing pulse number to each column of touch electrodes in the rest part of column groups.
7. The drive device according to claim 6, wherein the number of column groups is 2 column groups; the touch driving unit is specifically configured to sequentially load, in a direction in which the 1 st row of touch electrodes points to the last 1 st row of touch electrodes, touch driving signals with decreasing pulse numbers to each row of touch electrodes in the 1 st row group in the 2 row groups, and sequentially load, in the direction in which the 2 nd row of touch electrodes points, touch driving signals with increasing pulse numbers to each row of touch electrodes in the 2 nd row group.
8. The driving apparatus as recited in claim 6 wherein the refresh frequency of the touch screen is xHz; the frame time comprises N touch control stages; wherein N is greater than or equal to 1 and less than or equal to
Figure FDA0003098840980000031
An integer of (d);
the pulse number of the touch driving signals is y times of the pulse number of default touch driving signals prestored by the touch screen; y is an integer greater than or equal to 2.
9. The drive of any one of claims 6-8, further comprising: and the control driving unit is used for controlling the time points of the touch phases with the same occurrence frequency in one frame time to be different in two adjacent frame times.
10. A display device, comprising: the driving apparatus of the touch screen according to any one of claims 6 to 9.
11. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when executed by a processor, implements the steps of the method of driving a touch screen according to any one of claims 1 to 5.
12. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method for driving a touch screen according to any one of claims 1 to 5 are implemented when the processor executes the program.
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