CN112230800A - Touch display driving circuit, touch display device and touch display driving method - Google Patents

Touch display driving circuit, touch display device and touch display driving method Download PDF

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Publication number
CN112230800A
CN112230800A CN202011150222.3A CN202011150222A CN112230800A CN 112230800 A CN112230800 A CN 112230800A CN 202011150222 A CN202011150222 A CN 202011150222A CN 112230800 A CN112230800 A CN 112230800A
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CN
China
Prior art keywords
touch
stage
period
display
signal
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Pending
Application number
CN202011150222.3A
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Chinese (zh)
Inventor
陈波
刘卫平
张力申
潘亨霖
李振徽
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Inferpoint Systems Shenzhen Ltd
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Inferpoint Systems Shenzhen Ltd
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Priority to CN202011150222.3A priority Critical patent/CN112230800A/en
Priority to TW109138506A priority patent/TWI766420B/en
Publication of CN112230800A publication Critical patent/CN112230800A/en
Pending legal-status Critical Current

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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
    • 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
    • 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
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G06F3/04184—Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/40—OLEDs integrated with touch screens

Abstract

A touch display driving circuit, a touch display device and a touch display driving method are provided. The touch control circuit is used for controlling the touch electrode to realize touch detection, and the display control circuit is used for controlling the display panel to realize picture display. The synchronous control circuit selects a line frequency characteristic signal as a reference signal of the touch scanning characteristic signal. The reference signal is a pulse signal repeated in a reference period and has at least one display working phase in any one period. The touch scanning characteristic signal is a signal repeated by touch cycles, and each touch cycle comprises a transition stage. The synchronous control circuit further controls the display working phase and the transition phase not to overlap with each other so as to reduce mutual interference between touch operation and display operation.

Description

Touch display driving circuit, touch display device and touch display driving method
Technical Field
The present invention relates to a touch display driving circuit, a touch display device and a touch display driving method, and more particularly, to a touch display driving circuit, a touch display device and a touch display driving method for reducing mutual interference between a touch control circuit and a display control circuit.
Background
The conventional mobile phone using Organic Light Emitting Diode (OLED) material for display includes a touch structure and a display structure. The touch control structure is controlled by the touch control circuit to realize touch detection, and the display structure is controlled by the display control circuit to realize picture display. The touch structure comprises a plurality of touch electrodes driven by a touch control circuit, and the display structure comprises a plurality of pixel units arranged in a matrix. Each pixel unit has at least one light emitting diode therein. The display control circuit performs row scanning and column scanning on the pixel units, respectively. During the line scanning, the driving voltage is provided to the corresponding pixel unit through the multiplexer MUX corresponding to the pixel unit, and the current scanning line is switched through the gate line signal. When the display control circuit controls the pixel units to perform column switching or row switching, certain voltage fluctuation of the cathode of the light emitting diode is caused, and the voltage fluctuation is coupled to the touch electrode through parasitic capacitance between the cathode of the light emitting diode and the touch electrode and then conducted to the inside of the touch control circuit, so that noise of the touch control circuit is increased, and the performance of the touch control circuit is affected. In addition, when the touch control circuit scans the touch electrode, the rising edge and the falling edge of the touch signal may adversely affect the voltage of the cathode of the light emitting diode through the parasitic capacitance between the touch electrode and the cathode of the light emitting diode, and if the display control circuit controls the pixel units to perform line switching or the multiplexers MUX corresponding to different pixel units to perform switching at this time, the display screen of the touch display device may be abnormal, for example, water ripples, Color bands (Color bands), flickers (flickers), and the like may occur.
Disclosure of Invention
The present invention mainly aims to provide a touch display driving circuit, a touch display device and a touch display driving method, and aims to solve the problem that in the prior art, a touch control circuit and a display control circuit work asynchronously and interfere with each other.
A touch display driving circuit comprises a touch control circuit and a display control circuit; the touch control circuit is used for controlling the touch electrode to realize touch detection; the display control circuit is used for controlling the display panel to realize image display; the touch display control circuit further comprises a synchronous control circuit; the synchronous control circuit selects a line frequency characteristic signal as a reference signal of the touch scanning characteristic signal; the reference signal is a pulse signal which is repeated by a reference period, and at least one display working phase is arranged in any period; the touch scanning characteristic signal is a signal repeated by touch cycles, and each touch cycle comprises a transition stage; the synchronous control circuit further controls the display working phase and the transition phase not to overlap with each other.
A touch display device comprises a display panel and a touch electrode. The display panel receives a plurality of line frequency characteristic signals to drive the data lines and the scanning lines to perform line scanning operation. And the touch electrode receives the touch scanning characteristic signal to execute touch detection operation. The touch display device further comprises a touch display driving circuit. The touch display driving circuit comprises a touch control circuit and a display control circuit; the touch control circuit is used for controlling the touch electrode to realize touch detection. The display control circuit is used for controlling the display panel to realize picture display. The touch display control circuit further comprises a synchronous control circuit. The synchronous control circuit selects a line frequency characteristic signal as a reference signal of the touch scanning characteristic signal. The reference signal is a pulse signal repeated by a reference period, and has at least one display working phase in any period. The touch scanning characteristic signal is a signal repeated by touch cycles, and each touch cycle comprises a transition stage. The synchronous control circuit further controls the display working phase and the transition phase not to overlap with each other.
A touch display driving method is used for driving a touch display driving circuit; the touch display driving circuit comprises a touch control circuit, a display control circuit and a synchronous control circuit; the touch display driving method comprises the following steps:
the synchronous control circuit selects a line frequency characteristic signal as a reference signal of the touch scanning characteristic signal; the reference signal is a pulse signal which is repeated by a reference period, and at least one display working phase is arranged in any period; the touch scanning characteristic signal is a signal repeated by touch cycles, and each touch cycle comprises a transition stage;
the synchronous control circuit controls the transition stage and the display working stage not to overlap with each other.
According to the touch display driving circuit, the touch display device and the touch display driving method, the display working stage and the transition stage are kept not to overlap with each other through the synchronous control circuit, noise generated due to mutual interference between the transition stage and the display working stage in the touch detection period is reduced, display abnormity, such as water ripples, color bands and flickering, caused by interference between the transition stage and the display stage of the touch detection signal in the display operation period is reduced, and the display performance and the touch performance of the touch display device are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic perspective view of a touch display device according to the present invention.
Fig. 2 is a block diagram of the touch display driving circuit shown in fig. 1.
Fig. 3 is a detailed block diagram of the touch display driving circuit shown in fig. 2.
Fig. 4 is a timing diagram of horizontal synchronization signals, data line scanning signals, gate line signals and touch scanning synchronization signals corresponding to the synchronization control circuit in the first embodiment of fig. 3.
Fig. 5 is a timing diagram of a horizontal synchronization signal, a data line scanning signal, a gate line signal, and a touch scanning synchronization signal corresponding to the synchronization control circuit in the second embodiment of fig. 3 when controlling the touch period and the reference period to perform synchronization adjustment.
Fig. 6 is a timing diagram of a horizontal synchronization signal, a data line scanning signal, a gate line signal, and a touch scanning synchronization signal corresponding to the synchronization control circuit of the third embodiment in fig. 5 when the reference period is changed to control the reference period to be adjusted.
Fig. 7 is a timing diagram of a horizontal synchronization signal, a data line scanning signal, a gate line signal, and a touch scanning synchronization signal corresponding to the synchronization control circuit of the fourth embodiment in fig. 3 when the reference period is controlled to be adjusted when the touch period is changed.
Fig. 8 is a timing diagram of a horizontal synchronization signal, a data line scanning signal, a gate line signal and a touch scanning synchronization signal corresponding to the synchronization control circuit in the fifth embodiment of fig. 3.
Fig. 9 is a timing diagram of horizontal synchronization signals, data line scanning signals, gate line signals and touch scanning synchronization signals corresponding to the synchronization control circuit in the sixth embodiment of fig. 3.
Fig. 10 is a timing diagram of horizontal synchronization signals, data line scanning signals, gate line signals and touch scanning synchronization signals corresponding to the synchronization control circuit in the seventh embodiment of fig. 3.
Fig. 11a to 11d are timing diagrams of horizontal synchronization signals, data line scanning signals, gate line signals and touch detection signals corresponding to the synchronization control circuits of the eighth to eleventh embodiments in fig. 3.
Fig. 12 is a flowchart of a touch display driving method according to at least one embodiment of the invention.
Description of the main Components
Touch display device 1
Touch panel 10
Cover plate 11
Touch electrode layer 12
Display panel 20
Display control circuit 30
Touch control circuit 40
Data driving circuit 31
Scan driving circuit 32
Timing control circuit 34
Synchronous control circuit 50
Touch display area 101
Non-display area 103
Scanning line S1-Sn
Data line D1-Dm
Touch sensing line TS1-TSp
Pixel unit P
Vertical synchronization signal Vsync
Horizontal synchronization signal Hsync
Gate line signal SCAN
Data line scanning signal MUX (1) -MUX (m)
Touch synchronous control signal TP
Touch control periods TA, TA1, TA2
Horizontal synchronization periods TB, TB1, TB2
Line scanning period TC
Rising edge phase Tedge1
Step of falling edgeSegment Tedge2
High level phase Thigh
Low level phase Tlow
First stage T1
Second stage T2
Third stage T3
Fourth stage T4
Displaying the working phase TOLED
Steps S10-S12
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first", "second", and "third", etc. in the description of the present invention and the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprises" and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or modules is not limited to the listed steps or modules but may alternatively include other steps or modules not listed or inherent to such process, method, article, or apparatus.
The following describes a touch display device according to an embodiment of the present invention with reference to the drawings.
Fig. 1 is a schematic perspective view of a touch display device 1 according to an embodiment of the invention.
The touch display device 1 includes a touch panel 10 and a display panel 20. The touch panel 10 is used for sensing a touch operation of a user. The touch panel 10 includes a cover plate 11 and a touch electrode layer 12 stacked in sequence from top to bottom.
The cover plate 11 may be a glass substrate or other transparent substrate with high strength and high hardness. In at least one embodiment of the present invention, the cover plate 11 may be made of a material such as Polycarbonate (PC), Polyester (PET), polymethyl methacrylate (PMMA), Cyclic Olefin Copolymer (COC), or Polyether sulfone (PES).
The touch electrode layer 12 is made of a conductive material, and may be patterned to form a plurality of touch electrodes 120. In at least one embodiment of the present invention, the touch electrode layer 12 may be a single-layer conductive structure to form a self-contained touch sensing structure. In other embodiments, the touch electrode layer 12 may also be a multi-layer conductive structure to form a mutual capacitance type touch sensing structure.
The display panel 20 is located below the touch panel 10 and is used for displaying images. In at least one embodiment of the present invention, the display panel 20 is an OLED display structure, which may include a first electrode layer, a second electrode layer, a hole injection layer, a hole transport layer, a light emitting layer, and an electron injection layer. In other embodiments, the display panel 20 may also be a liquid crystal display structure.
Further, the touch display device 1 is defined with a touch display area 101 and a non-display area 103 disposed around the touch display area 101. The touch display area 101 includes a plurality of scan lines S1-SnA plurality of data lines D1-DmAnd touch sensing line TS1-TSp. Wherein n, m and p are positive integers. A plurality of the scanning lines S1-SnExtend along a first direction X and are arranged in parallelA plurality of said data lines D1-DmExtend along the second direction Y and are arranged in parallel to each other, and a plurality of scanning lines S1-SnAnd a plurality of said data lines D1-DmInsulated from each other and arranged in a grid-like cross, defining a plurality of pixel units P arranged in a matrix. In at least one embodiment of the present invention, the first direction X is disposed perpendicular to the second direction Y; a plurality of the touch sensing lines TS1-TSpParallel to each other and extending along said second direction Y. In other embodiments, the first direction X and the second direction Y may be arranged at other angles, and the plurality of touch sensing lines TS are disposed in a crossing manner1-TSpAre parallel to each other and extend along said second direction Y.
Please refer to fig. 2 and fig. 3, which are a schematic block diagram of the touch display driving circuit and a detailed block diagram of the touch display driving circuit in the touch display device 1. The touch display driving circuit includes a display control circuit 30, a touch control circuit 40, and a synchronization control circuit 50. The display control circuit 30 includes a data driving circuit 31, a scan driving circuit 32, and a timing control circuit 34 disposed in the non-display region 103. In at least one embodiment of the present invention, the touch display driving circuits are respectively disposed on two integrated chips according to the functional modules. In other embodiments, the touch display driving circuit may be disposed in the same integrated chip.
Each row of the pixel units P passes through one of the data lines DhAnd is electrically connected to the data driving circuit 31. Wherein h is greater than 0 and less than m. The data driving circuit 31 is used for providing a plurality of data line scanning signals MUX (1) -MUX (m) and the data line D in sequence through a plurality of multiplexers (not shown)1-DmTo provide the corresponding driving voltage of the digital signal to the data line D1-Dm。
Each column of the pixel units P passes through one of the scanning lines SiIs electrically connected to the scan driving circuit 32. Wherein i is greater than 0 and less than n. The SCAN driving circuit 32 provides the gate line signals SCAN to the plurality of SCAN linesS1-SnTo scan the pixel unit P. The gate line signal SCAN is a pulse signal that is repeated with a row SCAN period TC (shown in fig. 4). In at least one embodiment of the present invention, the row SCAN period TC may be a time period corresponding to a rising edge of two adjacent gate line signals SCAN. In other embodiments, the row SCAN period TC may be a time period corresponding to a falling edge of two adjacent gate line signals SCAN. All the data lines D in each line scanning period TC1-DmCompleting the loading of the digital signal once, and any one of the scanning lines SiThe loading of the gate line signal SCAN is completed once.
The timing control circuit 34 is electrically connected to the data driving circuit 31, the scan driving circuit 32 and the synchronization control circuit 50, respectively. The timing control circuit 34 generates a plurality of synchronization control signals to the data driving circuit 31 and the scan driving circuit 32. The plurality of synchronization control signals may include a periodic synchronization control signal and a non-periodic synchronization control signal. The synchronization control signal includes the horizontal synchronization signal Hsync and the vertical synchronization signal Vsync. The horizontal synchronizing signal Hsync is a pulse signal that repeats with a horizontal synchronizing period TB (shown in fig. 4). The vertical synchronization signal Vsync is a pulse signal repeated with a vertical synchronization period. In at least one embodiment of the present invention, the horizontal synchronization period TB may be a time period corresponding to a falling edge of two adjacent horizontal synchronization signals Hsync. In other embodiments, the horizontal synchronization period TB may be a time period corresponding to a rising edge of two adjacent horizontal synchronization signals Hsync. The horizontal synchronization signal Hsync has the same frequency and phase as the gate line signal SCAN. All the data lines D in each horizontal synchronizing signal Hsync1-DmCompleting the loading of the digital signal once and any one of the scanning lines SiThe loading of the gate line signal SCAN is completed once.
The touch electrode 120 passes through the plurality of touch sensing lines TS1-TSpAnd is electrically connected with the touch control circuit 40. The touch control circuit40 are configured to provide a touch scan characteristic signal to the touch electrode 120 and receive a touch signal generated by the touch electrode 120. In at least one embodiment of the present invention, the touch scan characteristic signal may be, but is not limited to, a touch synchronization signal, a touch driving signal, or a touch detection signal, which can represent a scan frequency and a phase of the touch control circuit. The touch scan characteristic signal may be measured by a touch IC, a flexible circuit board, and the touch panel 10. The touch scan characteristic signal is described below by taking the touch synchronization control signal TP as an example.
The touch synchronization control signal TP is a signal repeated with a touch period TA (as shown in fig. 4). The touch period TA may include a transition phase and a stable phase. In the transition stage of the touch period TA, the voltage of the touch synchronization control signal TP changes with time; in the stable stage, the touch synchronization control signal TP is maintained at the same level state. The transition phase of the touch period TA comprises a rising edge phase Tedge1And a falling edge phase Tedge2. During the rising edge period Tedge1The voltage of the touch synchronous control signal TP is increased along with the change of time; during the falling edge period Tedge2The voltage of the touch synchronization control signal TP is decreased with the change of time. The stabilization phase comprises a high level phase ThighAnd a low level period Tlow. The high level stage ThighIn the rising edge period Tedge1And said falling edge phase Tedge2Meanwhile, the touch synchronization control signal TP is maintained at the first voltage. The low level stage TlowIn the falling edge period Tedge2And the rising edge stage T of the next touch cycle TAedge1Meanwhile, the touch synchronization control signal TP is maintained at the second voltage. Wherein the second voltage is less than the first voltage. The touch synchronization control signal TP is used to represent the scanning frequency and phase of the touch control circuit 40.
The synchronous control circuit 50, the timing control circuit 34 and the touch control circuitThe vias 40 are electrically connected. The synchronous control circuit 50 selects a line frequency characteristic signal as a reference signal of the touch scanning characteristic signal, and controls the display working stage TOLEDAnd the transition phases do not overlap each other.
In at least one embodiment of the present invention, the reference signal may be the horizontal synchronization signal Hsync, the data line SCAN signal MUX (1) -MUX (m), or the gate line signal SCAN. In other embodiments, the reference signal may be other GOA signals or clock signals CK having the same frequency and phase as the horizontal synchronization signal Hsync, but is not limited thereto.
In the display working phase TOLEDIn, all the data lines D1-DmLoading corresponding driving voltage and any one of the scanning lines SiIs scanned. That is, each of the data line scan signals MUX (1) -MUX (m) completes one driving voltage output operation, and any one of the scan lines SiIs scanned. When the reference signal is a horizontal synchronizing signal Hsync, the display working phase TOLEDFor all the data lines D in one horizontal synchronization period TB1-DmCompleting the loading of the digital signal once and any one of the scanning lines SiA time required to complete the loading of the gate line signal SCAN once. When the reference signal is the gate line signal SCAN, the display operation stage TOLEDFor all the data lines D in one line scanning period TC1-DmCompleting the loading of the digital signal once and any one of the scanning lines SiA time required to complete the loading of the gate line signal SCAN once.
The reference signal has a reference period. The touch control period TA is K times of the reference period, and K is a positive integer greater than or equal to 1. That is, one touch period TA may correspond to K horizontal synchronization periods TB or K line scanning periods TC. I.e. the rising edge phase Tedge1And said falling edge phase Tedge2Either one of them and the display working phase TOLEDAre not mutually communicatedAnd (4) overlapping.
Implementation mode one
Please refer to fig. 4, which is a timing diagram of the horizontal synchronization signal Hsync, the data line SCAN signal MUX (1) -MUX (m), the gate line signal SCAN, and the touch SCAN synchronization signal TP corresponding to the synchronization control circuit 50 of the first embodiment. The synchronization control circuit 50 uses the horizontal synchronization signal Hsync as the reference signal. In this embodiment, the touch period TA is 2 times the horizontal synchronization period TB. That is, one touch period TA corresponds to 2 horizontal synchronization periods TB. The display working phase TOLEDBy all of the data lines D in the same horizontal synchronization period TB1-DmCompleting the loading of the digital signal once and any one of the scanning lines SiThe gate line signal SCAN is loaded once, and the horizontal synchronization signal Hsync is a time period corresponding to a falling edge of two adjacent horizontal synchronization signals Hsync. A transition phase of the touch control period TA and the display working phase TOLEDDo not overlap each other. I.e. the rising edge phase Tedge1And said falling edge phase Tedge2Either one of them and the display working phase TOLEDDo not overlap each other.
The synchronous control circuit 50 controls the first stage T1, the second stage T2, the third stage T3 and the fourth stage T4 in the touch control period TA to realize the display operation stage TOLEDAnd the transition phases do not overlap each other. Wherein the first phase T1 is used for isolating the rising edge phase Tedge1And the leading edge of the reference signal. The second stage T2 is used to isolate the start of the falling edge from the trailing edge of the reference signal. The third stage T3 is used for isolating the rising edge stage Tedge1And the display operating phase TOLEDThe starting point of (2). The fourth stage T4 is used for isolating the display working stage TOLEDAnd the falling edge phase Tedge2The starting point of (2). In at least one embodiment of the present invention, the second, third and fourth phases T2, T3, T4 and the high-level phase ThighThe second and fourth stages T2, T4, the third stage T3 being non-overlapping with the second and fourth stages T2, T4. The time periods of the first, second, third and fourth stages T1, T2, T3 and T4 may be adjusted as required, and may be 0. In other embodiments, different combinations may be set in the touch period TA, for example, only the third stage T3 and the fourth stage T4, or only the first stage T1 and the second stage T2, or only the first stage T1, the third stage T3, and the fourth stage T4, etc., without being limited thereto.
When the reference signal is a horizontal synchronization signal Hsync and the horizontal synchronization period is a time period corresponding to falling edges of two adjacent horizontal synchronization signals Hsync, the first stage T1 is a time period between a falling edge of the horizontal synchronization signal Hsync before a rising edge of the touch synchronization control signal TP and a start point of the rising edge of the touch synchronization control signal TP, and the second stage T2 is a time period between a falling edge of the horizontal synchronization signal Hsync before a falling edge of the touch synchronization control signal TP and a start point of the falling edge of the touch synchronization control signal TP. The third stage T3 is the rising edge stage Tedge1And the display operating phase TOLEDThe time period between the start points of (a). The fourth stage T4 is the display working stage TOLEDAnd the falling edge phase Tedge2The time period between the start points of (a).
Second embodiment
Referring to fig. 5, in the second embodiment, the timing diagram of the horizontal synchronization signal Hsync, the data line SCAN signal MUX (1) -MUX (m), the gate line signal SCAN, and the touch synchronization control signal TP corresponding to the synchronization adjustment performed by the synchronization control circuit 50 when controlling the touch period TA and the reference period is shown. The touch display device 1 of the second embodiment has the same structure as the touch display device 1 of the first embodiment. That is, the description of the touch display device 1 described in the first embodiment can basically be applied to the touch display device 1 of the second embodiment, and the main difference therebetween is that: when any one of the touch period TA and the reference period needs to be changed, the synchronization control circuit 50 controls the other one of the touch period TA and the reference period to perform synchronization adjustment. In any time period, the ratio of the touch period TA to the reference period is always K, and the display working phase and the transition phase are always in a non-overlapping state.
When the reference period is shortened, that is, the horizontal synchronization period TB1 is shortened to the horizontal synchronization period TB2, the synchronization control circuit 50 controls the touch period TA1 to be shortened to a touch period TA 2. The horizontal synchronization period TB2 and the touch period TA2 are changed at the same time. And the ratio of the touch period TA1 to the horizontal synchronization period TB1 is the same as the ratio of the touch period TA2 to the horizontal synchronization period TB2, i.e., TA1/TB1 is TA2/TB 2.
The change of any one of the touch period TA and the reference period may be:
when the display panel 20 needs to obtain a better display effect, the horizontal synchronization period TB needs to be shortened.
When the display panel 20 needs to reduce power consumption, the horizontal synchronization period TB needs to be extended.
When the touch panel 10 needs to avoid or reduce the noise interference, the touch period TA needs to be shortened.
When the touch panel 10 needs to reduce power consumption, the touch period TA needs to be shortened.
When the touch panel 10 needs to provide touch performance, the touch period TA needs to be extended.
Third embodiment
Referring to fig. 6, in a third embodiment, the synchronization control circuit 50 controls the horizontal synchronization signal Hsync, the data line SCAN signal MUX (1) -MUX (m), the gate line signal SCAN, and the touch synchronization control signal TP to adjust the touch period TA when the reference period needs to be changed. The touch display device 1 of the third embodiment has the same structure as the touch display device 1 of the first embodiment. That is, the description of the touch display device 1 described in the first embodiment can basically be applied to the touch display device 1 of the third embodiment, and the main difference therebetween is that: when the reference period is shortened, that is, the horizontal synchronization period TB1 is shortened to the horizontal synchronization period TB2, the synchronization control circuit 50 controls the touch control period TA to be shortened and adjusted. The touch period TA is shortened and adjusted by taking q periods as adjustment stages, and after the adjustment stages, the touch period TA2 is 2 times of the horizontal synchronization period TB2, while the display working stage and the transition stage are kept from overlapping with each other. Wherein q is a positive integer. In the adjusting phase, the touch period ta (x) may not be 2 times the horizontal synchronization period TB2, and the display operation phase and the transition phase may overlap. Wherein x is greater than 0 and less than q. In at least one embodiment of the present invention, in the adjusting phase, the horizontal synchronization periods TB1 maintain the current state, and each of the touch periods ta (x) is different from each other. After the adjustment phase, the horizontal synchronization period TB1 becomes the horizontal synchronization period TB 2.
Embodiment IV
Referring to fig. 7, in a fourth embodiment, the synchronization control circuit 50 controls the horizontal synchronization signal Hsync, the data line SCAN signal MUX (1) -MUX (m), the gate line signal SCAN, and the touch synchronization control signal TP to adjust the reference period when the touch period TA needs to be changed. The touch display device 1 of the fourth embodiment has the same structure as the touch display device 1 of the third embodiment. That is, the description of the touch display device 1 described in the third embodiment can basically be applied to the touch display device 1 of the fourth embodiment, and the main difference therebetween is that: when the touch period TA is shortened, that is, the touch period TA1 is shortened to the touch period TA2, the synchronization control circuit 50 controls the reference period to be shortened and adjusted, that is, the horizontal synchronization period TB1 is shortened and adjusted. The horizontal synchronization period TB1 is adjusted by taking q periods as adjustment stages, and after the adjustment stages, the synchronization control circuit 50 controls the horizontal synchronization period TB1 to be adjusted to the horizontal synchronization period TB2, and the touch period TA2 is 2 times of the horizontal synchronization period TB2, while keeping the display working stage and the transition stage not overlapped with each other. Wherein q is a positive integer. In the adjusting phase, the touch period TA2 may not be 2 times of the horizontal synchronization period tb (x), and the display operation phase and the transition phase may overlap. Wherein x is greater than 0 and less than q. In at least one embodiment of the present invention, in the adjusting phase, the touch periods TA1 maintain the current state, and each of the horizontal synchronization periods tb (x) is different from each other. After the adjusting phase, the touch period TA1 becomes the touch period TA 2.
Fifth embodiment
Please refer to fig. 8, which is a timing diagram illustrating the horizontal synchronization signal Hsync, the data selection signal MUX (1) -MUX (m), the row SCAN signal SCAN, and the touch synchronization control signal TP corresponding to the synchronization control processing circuit 50 in the fifth embodiment. The touch display device 1 of the fifth embodiment has the same structure as the touch display device 1 of the first embodiment. That is, the description of the touch display device 1 described in the first embodiment can be basically applied to the touch display device 1 of the fifth embodiment, and the main difference therebetween is that: the horizontal synchronization signal Hsync is calculated periodically in different manners. In the fifth embodiment, the horizontal synchronization signal Hsync is a period corresponding to a rising edge of two adjacent horizontal synchronization signals Hsync.
Sixth embodiment
Please refer to fig. 9, which shows the horizontal synchronization signal Hsync, the data line SCAN signals MUX (1) -MUX (m), the gate line signal SCAN, and the touch synchronization control signal corresponding to the synchronization control circuit 50 of the sixth embodimentTiming diagram of TP. The touch display device 1 of the sixth embodiment has the same structure as the touch display device 1 of the first embodiment. That is, the description of the touch display device 1 described in the first embodiment can basically be applied to the touch display device 1 of the sixth embodiment, and the main difference therebetween is that: the synchronization control circuit 50 uses the gate line signal SCAN as the reference signal, and the fourth phase T4 is not present in the touch period TA. In the sixth embodiment, the touch period TA is 2 times the line scanning period TC. That is, one touch period TA corresponds to 2 line scanning periods TC. The display working phase TOLEDBy all the data lines D in one line scanning period TC1-DmCompleting the loading of the digital signal once and any one of the scanning lines SiA time required to complete the loading of the gate line signal SCAN once. The line scanning period TC is a time period corresponding to a rising edge of two adjacent line scanning periods TC. The rising edge phase Tedge1And said falling edge phase Tedge2Either one of them and the display working phase TOLEDDo not overlap each other.
When the reference signal is the gate line signal SCAN and the row SCAN period TC is a time period corresponding to a rising edge of two adjacent gate line signals SCAN, the first phase T1 is a time period between a rising edge of the gate line signal SCAN before a rising edge of the touch synchronization control signal TP and a start point of a rising edge of the touch synchronization control signal TP, and the second phase T2 is a time period between a rising edge of the gate line signal SCAN before a falling edge of the touch synchronization control signal TP and a start point of a falling edge of the touch synchronization control signal TP. The third stage T3 is the rising edge stage Tedge1And the display operating phase TOLEDThe time period between the start points of (a).
Seventh embodiment
Please refer to fig. 10, which is a timing diagram illustrating the horizontal synchronization signal Hsync, the data line SCAN signals MUX (1) -MUX (m), the gate line signal SCAN, and the touch synchronization control signal TP corresponding to the synchronization control circuit 50 according to the seventh embodiment. The touch display device 1 of the seventh embodiment has the same structure as the touch display device 1 of the first embodiment. That is, the description of the touch display device 1 described in the first embodiment can basically be applied to the touch display device 1 of the seventh embodiment, and the main difference therebetween is that: the touch period TA is K times the horizontal synchronization period TB. That is, one touch period TA corresponds to K horizontal synchronization periods TB.
Please refer to fig. 11a, which is a timing diagram of the horizontal synchronization signal Hsync, the data line SCAN signal MUX (1) -MUX (m), the gate line signal SCAN, and the touch detection signal SX corresponding to the synchronization control circuit 50 in the eighth embodiment of fig. 3. The touch display device 1 of the eighth embodiment has the same structure as the touch display device 1 of the first embodiment. That is, the description of the touch display device 1 described in the first embodiment can basically be applied to the touch display device 1 of the eighth embodiment, and the main difference therebetween is that: the touch scanning characteristic signal is the touch detection signal SX, and the reference signal is the horizontal synchronization signal Hsync. The rising edge stage T corresponding to the touch detection signal SXedge1And said falling edge phase Tedge2Is controlled by the display control circuit 30. One period of the touch detection signal SX is 4 times of the horizontal synchronization period.
Fig. 11b is a timing diagram of the horizontal synchronization signal Hsync, the data line SCAN signal MUX (1) -MUX (m), the gate line signal SCAN, and the touch detection signal SX corresponding to the synchronization control circuit 50 in the ninth embodiment. The touch display device 1 of the ninth embodiment has the same structure as the touch display device 1 of the eighth embodiment. That is, the description of the touch display device 1 described in the eighth embodiment can basically be applied to the touch display device 1 of the ninth embodiment, and the main difference therebetween is that: one period of the touch detection signal SX is 2 times of the horizontal synchronization period.
Fig. 11c is a timing diagram of the horizontal synchronization signal Hsync, the data line SCAN signal MUX (1) -MUX (m), the gate line signal SCAN, and the touch detection signal SX corresponding to the synchronization control circuit 50 in the tenth embodiment. The touch display device 1 according to the tenth embodiment has the same structure as the touch display device 1 according to the eighth embodiment. That is, the description of the touch display device 1 described in the eighth embodiment can basically be applied to the touch display device 1 of the tenth embodiment, and the main difference therebetween is that: the reference signal is the gate line signal SCAN.
Fig. 11d is a timing diagram of the horizontal synchronization signal Hsync, the data line SCAN signal MUX (1) -MUX (m), the gate line signal SCAN, and the touch detection signal SX corresponding to the synchronization control circuit 50 in the eleventh embodiment. The touch display device 1 of the eleventh embodiment has the same structure as the touch display device 1 of the eighth embodiment. That is, the description of the touch display device 1 described in the eighth embodiment can basically be applied to the touch display device 1 of the eleventh embodiment, and the main difference therebetween is that: one period of the touch detection signal SX is 2m times of the horizontal synchronization period.
Based on the touch display device 1, the display working phase T is maintained by the synchronous control circuit 50OLEDThe transition stage is not overlapped with the transition stage, noise generated by mutual interference between the transition stage and the display working stage during touch detection is reduced, display abnormality, such as water ripples, color stripes and flickering, caused by interference between the transition stage and the display stage of the touch detection signal during display operation is reduced, and the display performance and the touch performance of the touch display device 1 are improved. Meanwhile, any one of the reference signal and the touch signal is requiredWhen the touch signal is changed, the synchronization control circuit 50 adjusts the other one, so that the synchronization between the touch signal and the reference signal can be automatically maintained. In addition, the mutual interference between the display operation and the touch operation can be further reduced by setting the first to fourth stages T1-T4, and the display performance and the touch performance of the touch display device 1 can be further improved.
Please refer to fig. 12, which is a flowchart illustrating a touch display driving method. The touch display driving method is used for driving the touch display device 1 corresponding to the first to eleventh embodiments. The touch display device 1 includes a data driving circuit 31, a scan driving circuit 32, a timing control circuit 34, a touch control circuit 40, and a synchronization control circuit 50.
S10, the synchronous control circuit 50 selects a line frequency characteristic signal as a reference signal of the touch scanning characteristic signal.
In the display working phase TOLEDIn, all the data lines D1-DmLoading corresponding driving voltage and any one of the scanning lines SiIs scanned. That is, each of the data line scan signals MUX (1) -MUX (m) completes one driving voltage output operation, and any one of the scan lines SiIs scanned.
In at least one embodiment of the present invention, the reference signal may be the horizontal synchronization signal Hsync, the data line SCAN signal MUX (1) -MUX (m), or the gate line signal SCAN. In other embodiments, the reference signal may be other GOA signals or clock signals CK having the same frequency and phase as the horizontal synchronization signal Hsync, but is not limited thereto. When the reference signal is a horizontal synchronizing signal Hsync, the display working phase TOLEDFor all the data lines D in one horizontal synchronization period TB1-DmCompleting the loading of the digital signal once and any one of the scanning lines SiA time required to complete the loading of the gate line signal SCAN once. When the reference signal is the gate line signal SCAN, the display operation stage TOLEDFor all the data lines in the line scanning period TCD1-DmCompleting the loading of the digital signal once and any one of the scanning lines SiA time required to complete the loading of the gate line signal SCAN once.
In at least one embodiment of the present invention, the touch scan characteristic signal is exemplified by the touch synchronization control signal TP. The touch synchronization control signal TP is a pulse signal repeated with a touch cycle TA. The touch period TA includes a transition phase. In the transition phase of the touch period TA, the touch synchronization control signal TP changes with time. Wherein the transition phase of the touch period TA comprises a rising edge phase Tedge1And a falling edge phase Tedge2. The touch period TA is K times the horizontal synchronization period TB or the line scanning period TC, and K is a positive integer greater than or equal to 1. That is, one touch period TA may correspond to K horizontal synchronization periods TB or K line scanning periods TC.
S11, the synchronous control circuit 50 controls the transition stage and the display working stage TOLEDDo not overlap each other.
The synchronous control circuit 50 controls the first stage T1, the second stage T2, the third stage T3 and the fourth stage T4 in the touch control period TA to realize the display operation stage TOLEDAnd the transition phases do not overlap each other. Wherein the first phase T1 is used for isolating the rising edge phase Tedge1And the leading edge of the reference signal. The second stage T2 is used to isolate the start of the falling edge from the trailing edge of the reference signal. The third stage T3 is used for isolating the rising edge stage Tedge1And the display operating phase TOLEDThe starting point of (2). The fourth stage T4 is used for isolating the display working stage TOLEDAnd the falling edge phase Tedge2The starting point of (2). In at least one embodiment of the present invention, the second, third and fourth phases T2, T3, T4 and the high-level phase ThighThe second stage T2 and the fourth stage T4, the third stage T3 and the fourth stage T4The second stage T2 and the fourth stage T4 do not overlap. The time periods of the first, second, third and fourth stages T1, T2, T3 and T4 may be adjusted as required, and may be 0. In other embodiments, different combinations may be set in the touch period TA, for example, only the third stage T3 and the fourth stage T4, or only the first stage T1 and the second stage T2, or only the first stage T1, the third stage T3, and the fourth stage T4, etc., without being limited thereto.
As shown in fig. 4, when the reference signal is a horizontal synchronization signal Hsync and the horizontal synchronization period is a time period corresponding to a falling edge of two adjacent horizontal synchronization signals Hsync, the first phase T1 is a time period between a falling edge of the horizontal synchronization signal Hsync before a rising edge of the touch synchronization control signal TP and a start point of a rising edge of the touch synchronization control signal TP, and the second phase T2 is a time period between a falling edge of the horizontal synchronization signal Hsync before a falling edge of the touch synchronization control signal TP and a start point of a falling edge of the touch synchronization control signal TP. The third stage T3 is the rising edge stage Tedge1And the display operating phase TOLEDThe time period between the start points of (a). The fourth stage T4 is the display working stage TOLEDAnd the falling edge phase Tedge2The time period between the start points of (a).
S12, the synchronization control circuit 50 controls one of the touch control period TA and the reference period to adjust when detecting that the other one is changed.
In one embodiment, referring to fig. 5, when either one of the touch period TA and the reference period needs to be changed, the synchronization control circuit 50 controls the other one of the touch period TA and the reference period to perform synchronization adjustment. In any time period, the ratio of the touch period TA to the reference period is always K, and the display working phase and the transition phase are always in a non-overlapping state.
When the reference period is shortened, that is, the horizontal synchronization period TB1 is shortened to the horizontal synchronization period TB2, the synchronization control circuit 50 controls the touch period TA1 to be shortened to a touch period TA 2. The horizontal synchronization period TB2 and the touch period TA2 are changed at the same time. And the ratio of the touch period TA1 to the horizontal synchronization period TB1 is the same as the ratio of the touch period TA2 to the horizontal synchronization period TB2, i.e., TA1/TB1 is TA2/TB 2.
The change of any one of the touch period TA and the reference period may be:
when the display panel 20 needs to obtain a better display effect, the horizontal synchronization period TB needs to be shortened.
When the display panel 20 needs to reduce power consumption, the horizontal synchronization period TB needs to be extended.
When the touch panel 10 needs to avoid or reduce the noise interference, the touch period TA needs to be shortened.
When the touch panel 10 needs to reduce power consumption, the touch period TA needs to be shortened.
When the touch panel 10 needs to provide touch performance, the touch period TA needs to be extended.
In one embodiment, referring to fig. 6, when the reference period is shortened, that is, the horizontal synchronization period TB1 is shortened to the horizontal synchronization period TB2, the synchronization control circuit 50 controls the touch period TA to be shortened and adjusted. The touch period TA is shortened and adjusted by taking q periods as adjustment stages, and after the adjustment stages, the touch period TA2 is 2 times of the horizontal synchronization period TB2, while the display working stage and the transition stage are kept from overlapping with each other. Wherein q is a positive integer. In the adjusting phase, the touch period ta (x) may not be 2 times the horizontal synchronization period TB2, and the display operation phase and the transition phase may overlap. Wherein x is greater than 0 and less than q. In at least one embodiment of the present invention, in the adjusting phase, the horizontal synchronization periods TB1 maintain the current state, and each of the touch periods ta (x) is different from each other. After the adjustment phase, the horizontal synchronization period TB1 becomes the horizontal synchronization period TB 2.
In another embodiment, referring to fig. 7, when the touch period TA is shortened, that is, the touch period TA1 is shortened to the touch period TA2, the synchronization control circuit 50 controls the reference period to shorten and adjust, that is, the horizontal synchronization period TB1 is shortened and adjusted. The horizontal synchronization period TB1 is adjusted by taking q periods as adjustment stages, and after the adjustment stages, the synchronization control circuit 50 controls the horizontal synchronization period TB1 to be adjusted to the horizontal synchronization period TB2, and the touch period TA2 is 2 times of the horizontal synchronization period TB2, while keeping the display working stage and the transition stage not overlapped with each other. Wherein q is a positive integer. In the adjusting phase, the touch period TA2 may not be 2 times of the horizontal synchronization period tb (x), and the display operation phase and the transition phase may overlap. Wherein x is greater than 0 and less than q. In at least one embodiment of the present invention, in the adjusting phase, the touch periods TA1 maintain the current state, and each of the horizontal synchronization periods tb (x) is different from each other. After the adjusting phase, the touch period TA1 becomes the touch period TA 2.
Based on the touch display driving method, the display working stage T is maintained by the synchronous control circuit 50OLEDThe transition stage is not overlapped with the transition stage, noise generated by mutual interference between the transition stage and the display working stage during touch detection is reduced, display abnormality, such as water ripples, color stripes and flickering, caused by interference between the transition stage and the display stage of the touch detection signal during display operation is reduced, and the display performance and the touch performance of the touch display device 1 are improved. Meanwhile, when any one of the reference signal and the touch signal needs to be changed, the synchronization control circuit 50 adjusts the other one, so that the synchronization between the touch signal and the reference signal can be automatically maintained. In addition, the mutual interference between the display operation and the touch operation can be further reduced by setting the first to fourth stages T1-T4, and the display performance and the touch performance of the touch display device 1 can be further improved.
It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the order of acts, as some steps may occur in other orders or concurrently 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.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is merely a logical division, and in actual implementation, there may be other divisions, for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or modules through some interfaces, and may be in an electrical or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
It should also be noted that, in this document, 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 above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (19)

1. A touch display driving circuit comprises a touch control circuit and a display control circuit; the touch control circuit is used for controlling the touch electrode to realize touch detection; the display control circuit is used for controlling the display panel to realize image display; the method is characterized in that: the touch display driving circuit further comprises a synchronous control circuit; the synchronous control circuit selects a line frequency characteristic signal as a reference signal of the touch scanning characteristic signal; the reference signal is a pulse signal which is repeated by a reference period, and at least one display working phase is arranged in any period; the touch scanning characteristic signal is a signal repeated by touch cycles, and each touch cycle comprises a transition stage; the synchronous control circuit further controls the display working phase and the transition phase not to overlap with each other.
2. The touch display driver circuit of claim 1, wherein the transition phase comprises a rising edge phase and a falling edge phase; a first stage and a second stage are further arranged in the touch control period to isolate the display working stage and the transition stage; the first stage is used for isolating the starting point of the rising edge stage from the front edge of the reference signal; the second stage is used to isolate the start of the falling edge from the trailing edge of the reference signal.
3. The touch display driving circuit according to claim 2, wherein a third stage and a fourth stage are further provided in the touch cycle to isolate the display operation stage from the transition stage; the third stage is used for isolating the end point of the rising edge stage and the starting point of the display working stage; the fourth stage is used for isolating the end point of the display working stage and the starting point of the falling edge stage.
4. The touch display driver circuit according to claim 3, wherein the second, third, and fourth phases partially overlap with the high phase, the second and fourth phases partially overlap, and the third, second, and fourth phases do not overlap.
5. The touch display driving circuit according to claim 1, wherein the synchronization control circuit further controls one of the reference period and the touch period to adjust when any one of the reference period and the touch period needs to be changed, so as to keep the touch period K times the reference period and keep the display operation phase and the transition phase not overlapping with each other.
6. The touch display driving circuit according to claim 5, wherein the synchronization control circuit controls the other of the reference period and the touch period to be adjusted in synchronization; in any time period, the ratio of the touch period to the reference period is always K, the display working stage and the transition stage are always in a non-overlapping state, and K is a positive integer greater than 1.
7. The touch display driving circuit according to claim 5, wherein the synchronization control circuit further controls the other of the reference period and the touch period to be adjusted with q periods as adjustment stages; before the adjustment stage, the touch period is K times of the reference period, after the adjustment stage, the touch period is K times of the reference period, and the display working stage and the transition stage are not overlapped with each other; in the adjusting stage, the touch period may not be K times of the reference period, the display working stage and the transition stage may overlap, and K is a positive integer greater than 1.
8. The touch display driving circuit according to claim 1, wherein the reference signal is a horizontal synchronization signal, a data line scanning signal, or a gate line signal.
9. The touch display driving circuit according to claim 1, wherein, in the display operation phase, all data lines of the display panel are loaded with corresponding driving voltages, and any one scanning line is scanned;
and in the transition stage, the voltage of the touch synchronous control signal is switched between high and low levels.
10. A touch display device comprises a display panel and a touch electrode; the display panel receives a plurality of line frequency characteristic signals to drive the data lines and the scanning lines to execute line scanning operation; the touch electrode receives the touch scanning characteristic signal to execute touch detection operation; the method is characterized in that: the touch display device further comprises a touch display driving circuit according to any one of claims 1 to 10.
11. The touch display device of claim 10, which is an organic light emitting diode touch display device.
12. A touch display driving method is used for driving a touch display driving circuit; the touch display driving circuit comprises a touch control circuit, a display control circuit and a synchronous control circuit; the touch display driving method comprises the following steps:
the synchronous control circuit selects a line frequency characteristic signal as a reference signal of the touch scanning characteristic signal; the reference signal is a pulse signal which is repeated by a reference period, and at least one display working phase is arranged in any period; the touch scanning characteristic signal is a signal repeated by touch cycles, and each touch cycle comprises a transition stage;
the synchronous control circuit controls the transition stage and the display working stage not to overlap with each other.
13. The touch display driving method according to claim 12, wherein the transition phase includes a rising edge phase and a falling edge phase; setting a first stage and a second stage in the touch control period to isolate the display working stage and the transition stage; the first stage is used for isolating the starting point of the rising edge stage from the front edge of the reference signal; the second stage is used to isolate the start of the falling edge from the trailing edge of the reference signal.
14. The touch display driving method according to claim 13, wherein a third stage and a fourth stage are further provided in the touch cycle to isolate the display operation stage from the transition stage; the third stage is used for isolating the end point of the rising edge stage and the starting point of the display working stage; the fourth stage is used for isolating the end point of the display working stage and the starting point of the falling edge stage.
15. The touch display driving method according to claim 12, further comprising:
and when detecting that either one of the reference period and the touch period needs to be changed, controlling the other one of the reference period and the touch period to adjust so as to keep the touch period to be K times of the reference period and simultaneously keep the display working phase and the transition phase not to overlap with each other, wherein K is a positive integer greater than 1.
16. The touch display driving method according to claim 15, further comprising:
controlling the other one of the reference period and the touch period to perform synchronous adjustment; in any time period, the ratio of the touch period to the reference period is always K times, the display working stage and the transition stage are always in a non-overlapping state, and K is a positive integer greater than 1.
17. The touch display driving method according to claim 15, further comprising:
controlling the other one of the reference period and the touch period to be adjusted by taking q periods as adjustment stages; before the adjustment stage, the touch period is K times of the reference period, after the adjustment stage, the touch period is K times of the reference period, and the display working stage and the transition stage are not overlapped with each other; in the adjusting phase, the touch period may not be K times of the reference period, and the display working phase and the transition phase may overlap.
18. The touch display driving method according to claim 12, wherein the reference signal is a horizontal synchronization signal, a data line scanning signal, or a gate line signal.
19. The touch display driving method according to claim 12, wherein in the display working phase, all data lines of the display panel are loaded with corresponding driving voltages, and any one scanning line is scanned;
and in the transition stage, the voltage of the touch synchronous control signal is switched between high and low levels.
CN202011150222.3A 2020-10-23 2020-10-23 Touch display driving circuit, touch display device and touch display driving method Pending CN112230800A (en)

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