CN109828686A - The control method and control device of touch display screen - Google Patents
The control method and control device of touch display screen Download PDFInfo
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- CN109828686A CN109828686A CN201910038845.2A CN201910038845A CN109828686A CN 109828686 A CN109828686 A CN 109828686A CN 201910038845 A CN201910038845 A CN 201910038845A CN 109828686 A CN109828686 A CN 109828686A
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Abstract
This application discloses a kind of control method of touch display screen and control devices.The control method of the touch display screen includes: to generate display synchronization signal and touch sync signal；When display synchronization signal is effective status, display scanning signal is provided to touch display screen according to data cached, touch sync signal is maintained at invalid state；It when display synchronization signal is invalid state, is provided according to touch sync signal to touch display screen and touches scanning signal, touch sync signal is maintained at effective status, wherein show that the frequency of scanning signal is uncorrelated to the frequency of scanning signal is touched.The control method controls touch display screen progress touch-control by display synchronization signal and touch sync signal and shows, to show that the frequency of scanning can dynamic change according to actual needs, the frequency for touching scanning remains unchanged, and the speed and accuracy of touch detection can be improved while optimization shows picture.
Description
Technical field
The present invention relates to field of display technology, control method and control dress more particularly, to a kind of touch display screen
It sets.
Background technique
With advances in technology, it touches display technology and is increasingly being applied to every field, show quality for touching
Requirement it is also higher and higher.Traditional touch display panel includes touch display panel and control device, on touch display panel
Incorporate display panel and touch panel.The prior art integrates (Touch and Display using touch-control and display driver
Driver Integration, TDDI) technology by touch control and display driving be integrated in a chips, as shown in Figure 1.Figure
Touch display system shown in 1 includes that display host 100, control device 200 and touch display screen 300, control device 200 include
Driver module 201 and contact control module 202.Driver module 201 and contact control module 202 are respectively used to touching
It touches display screen 300 and carries out display driving and touch detection, the mode that touch detection and display driving timesharing carry out, to avoid showing
Drive the interference to touch detection.That is, suspending touch detection when carrying out display driving；Carry out touch detection
When, pause display driving.This mode usually requires that touch detection and display driving keep synchronous working, touch detection frequency
With display frequency at fixed proportion relationship.For example, if display frequency 60Hz, touch detection frequency if, is fixed as 60 or 120Hz.
Due to optimizing the needs of display effect, dynamic is needed to adjust display frequency, such as in 30Hz to 90Hz switching at runtime, then touching
Detect frequency also can dynamic change therewith, this can all generate negative impact to the speed and accuracy of touch detection.Therefore, urgently
Need to control method to the touch display screen of the prior art and control device be further improved, to solve the above problems.
Summary of the invention
In view of the above problems, the purpose of the present invention is to provide a kind of control method of touch display screen and control device,
Wherein, show that the frequency of scanning signal is uncorrelated to the frequency of scanning signal is touched, to show that the frequency of scanning can basis
Actual needs and dynamic change, the frequency for touching scanning remain unchanged.
According to an aspect of the present invention, a kind of control method of touch display screen is provided, comprising: generate display synchronization signal
And touch sync signal；When the display synchronization signal is effective status, mentioned according to data cached to the touch display screen
For showing that scanning signal, the touch sync signal are maintained at invalid state；When the display synchronization signal is invalid state,
It is provided according to the touch sync signal to the touch display screen and touches scanning signal, the touch sync signal has been maintained at
Effect state, wherein the frequency of the display scanning signal is uncorrelated to the touch frequency of scanning signal.
Preferably, when the display synchronization signal is invalid state, the frequency and the touching for touching scanning signal
The frequency for touching synchronization signal is identical.
Preferably, further includes: mode switching signal is generated, it is described when the mode switching signal characterizes display pattern
Display synchronization signal is maintained at effective status, and the touch sync signal is maintained at invalid state.
Preferably, further includes: when the display synchronization signal is invalid, display data are cached described slow to obtain
Deposit data.
Preferably, caching is set according to the transmission speed of the ineffective time of the display synchronization signal and the display data
Parameter.
Preferably, the cached parameters include caching depth.
According to another aspect of the present invention, a kind of control device of touch display screen is provided, comprising: the first control module,
For providing display scanning signal to the touch display screen according to data cached；Second control module, for same according to touching
It walks signal and provides touch scanning signal to the touch display screen；And synchronization signal generation module, for being controlled to described first
Molding block sends display synchronization signal, and the second control module of Xiang Suoshu sends the touch sync signal, wherein when the display
When synchronization signal is effective status, first control module is opened to provide the display scanning signal, and the touch synchronizes
Signal is maintained at invalid state.
Preferably, the frequency for touching scanning signal is identical as the frequency of the touch sync signal.
Preferably, further includes: micro-control unit, for providing mode switching signal to the synchronization signal generation module,
When the mode switching signal characterizes touch-control display pattern, the synchronization signal generation module is in the display synchronization signal
The touch sync signal that effective status is generated when invalid state, generates nothing when the display synchronization signal is effective status
The touch sync signal of effect state, when the mode switching signal characterizes display pattern, the synchronization signal generates mould
Block generates the touch sync signal of invalid state when the display synchronization signal is effective status.
Preferably, further includes: buffer is connected with first control module, for receiving display data, and according to institute
It is described data cached to state display data acquisition, when the display synchronization signal is effective, the buffer receiving display number
According to and obtain it is described data cached, first control module from the buffer extract it is described data cached, when the display
When synchronization signal is invalid, the buffer persistently receives and caches the display data, described data cached to obtain.
Preferably, the buffer includes first in first out (first in first out, FIFO) memory.
The control method and control device of touch display screen provided by the invention, using synchronization signal generation module respectively to
First control module and the second control module provide display synchronization signal and touch sync signal, thus needing to carry out touch inspection
When survey, driving and touch detection can be alternately shown.Display scanning signal provided by display host, touch scanning signal by
Synchronization signal generation module provides, so that touching the frequency of scanning can remain unchanged, shows that the frequency of scanning can be according to reality
Border needs and dynamic change, scan frequency variation is touched caused by avoiding because of display scan frequency variation, so as to cause inspection
The problem of indeterminacy is really and detection slows.
Further, the control method and control device of the touch display screen, display host and display driver chip it
Between buffer is set, the first control module stop during, buffer persistently receives display data, be conducive to accelerate first control
The speed of service of module.
Detailed description of the invention
By referring to the drawings to the description of the embodiment of the present invention, above-mentioned and other purposes of the invention, feature and
Advantage will be apparent from, in the accompanying drawings:
Fig. 1 shows the attachment structure schematic diagram of touch display system according to prior art.
Fig. 2 shows the equivalent circuit diagrams of display panel according to an embodiment of the present invention.
Fig. 3 shows the equivalent circuit diagram of touch panel according to an embodiment of the present invention.
Fig. 4 shows the attachment structure schematic diagram of touch display system according to an embodiment of the present invention.
Fig. 5 shows the signal timing diagram of control device according to an embodiment of the present invention.
Fig. 6 shows the flow chart of control method according to an embodiment of the present invention.
Description of symbols
100 display hosts
200 control devices
201 driver modules
202 contact control modules
210 first control modules
211 buffers
220 second control modules
230 synchronization signal generation modules
231 micro-control units
300 touch display screens
310 display panels
311 grid electrode drive modules
312 source drive modules
320 touch panels
321 touch drive module
322 touch sensible modules
Specific embodiment
The various embodiments that the present invention will be described in more detail that hereinafter reference will be made to the drawings.In various figures, identical element
It is indicated using same or similar appended drawing reference.For the sake of clarity, the various pieces in attached drawing are not necessarily to scale.
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.
In Fig. 2 with liquid crystal display panel be illustrated display panel 310 according to an embodiment of the present invention.Such as Fig. 2 institute
Show, display panel 310 includes grid electrode drive module 311, source drive module 312, multiple thin film transistor (TFT) T and in pixel
The multiple pixel capacitance C formed between electrode and public electrodeLc.The multiple thin film transistor (TFT) T forms array.Gate driving mould
Block 311 is respectively connected to the grid of the thin film transistor (TFT) T of corresponding line via a plurality of controlling grid scan line G1 to Gm, for scanning
Mode provides grid voltage G1 to Gm, to gate the thin film transistor (TFT) that do not go together in a picture frame period.Source drive
Module 312 is respectively connected to the source electrode of the thin film transistor (TFT) T of respective column via a plurality of source data line S1 to Sn, in each row
Multiple thin film transistor (TFT) T gating when, it is electric to provide corresponding with grayscale grayscale to multiple thin film transistor (TFT) T of each column respectively
Pressure.Wherein, m and n is natural number.The drain electrode of the multiple thin film transistor (TFT) T is respectively connected to a corresponding pixel capacitance CLc。
In the case where side leads to state, source drive module 312 is applied to pixel via source data line and thin film transistor (TFT) T, by gray scale voltage
Capacitor CLcOn.Pixel capacitance CLcOn voltage act on liquid crystal molecule, to change the orientation of liquid crystal molecule, with realize with
The corresponding light transmittance of grayscale.In order to keep voltage, pixel capacitance C between the update cycle of pixelLcIt can storage electricity in parallel
Hold Cs to obtain the longer retention time.
It is to illustrate the internal structure and connection relationship of display panel by taking liquid crystal display panel as an example in the present embodiment, but this hair
Bright display panel is not limited to liquid crystal display panel.
In Fig. 3 with capacitance touching control be illustrated touch panel 320 according to an embodiment of the present invention.As shown in figure 3,
Touch panel 320 includes touching drive module 321, touch sensible module 322 and the shape between excitation electrode and induction electrode
At multiple inductance capacitance C.The multiple inductance capacitance C forms array.Drive module 321 is touched via scan line TX1 to TXm
It is connected to the excitation electrode of all rows, for providing pumping signal in a manner of scanning, thus in a touch-control frame period, according to
It is secondary to provide pumping signal to the excitation electrode that do not go together.Touch sensible module 322 is connected to all via line of induction RX1 to RXn
The induction electrode of column, to receive the touch sensible signal of respective column.Wherein, m and n is natural number.Touch drive module 321
Ac signal is such as generated as pumping signal, touch sensible module 322 for example receives the touch sensible of ac signal form
Signal goes out current value according to touch sensible signal detection, further obtains driving electrodes and induced electricity according to the size of current value
The capacitance in pole crosspoint, to judge whether to generate touch action in the point.
Although the cabling number in display panel and touch panel, art technology are described by taking m and n as an example above
Personnel it should be clear that more than be intended merely to facilitate description, the cabling number in practical application in display panel and touch panel is not
It is certain identical.And the present embodiment is only the structure and working principle for illustrating touch panel by taking mutual capacitance type touch control as an example, but ability
Field technique personnel are it should be clear that the above is only an examples of touch panel, and touch panel of the invention is without being limited thereto.
Fig. 4 shows the attachment structure schematic diagram of touch display system according to an embodiment of the present invention.
As shown in figure 4, touch display system includes display host 100, control device 200 and touch display screen 300.Display
Host 100 is connected to touch display screen 300 via control device 200.
Display host 100 for generates control signal and it is corresponding with the image to be shown in touch display screen 300 show
Registration evidence, and display data and control signal are supplied to control device 200.Display host 100 via interface for that will show
Registration evidence and control signal are transferred to control device 200.
Control device 200 is used to drive touch aobvious based on control signal and the display data transmitted from display host 100
Display screen 300.Control device 200 can handle display data based on control signal, to generate picture signal and by picture signal
It is transferred to touch display screen 300.
For touch display screen 300 for example including the touch panel and display panel combined, Integration Mode can basis
It needs to select, such as, but not limited on cell, in cell etc..Display panel be equipped with above-mentioned thin film transistor (TFT), as
Plain electrode, public electrode and corresponding cabling, touch panel are equipped with above-mentioned excitation electrode, induction electrode and walk accordingly
Line.In alternate embodiments, touch display screen 300 may include discrete touch panel and display panel.
In this embodiment, control device 200 includes display driving system, touch control system and control module.
Display driving system includes the first control module 210 and buffer 211.
Display host 100 is connected to the first control module 210 via buffer 211, and display host 100 will show that data pass
It transports in buffer 211 and stores, buffer 211 will show data buffer storage and obtain data cached.First control module 210 is for example
For driver module, the first control module 210 is extracted data cached from buffer 211, obtains control letter from control module
Number.Signal is controlled for example including display synchronization signal, buffer 211 is, for example, push-up storage.First control module 210
It is connected to touch display screen 300, to provide display scanning signal to touch display screen 300 and drive touch display screen 300.Display
To the offer display data of buffer 211, buffer 211 receives display data and is controlled according to display data to first host 100
Module 210 provide it is data cached, the first control module 210 according to it is data cached to touch display screen 300 provide display scanning letter
Number, touch display screen 300 carries out display scanning according to display scanning signal, to show that host 100 controls the first control module
210 display scan frequency.
The effect of buffer 211 is, when display synchronization signal is in invalid state, the first control module 210 is from described
Buffer 211 extracts data cached, and when system is in touch detection mode, buffer holds 211 continued accesses and receives and cache described aobvious
Registration evidence.The depth of buffer 211 is for example filled according to the maximum duration of a touch detection validity period and display host to control
The speed of the display data of transmission is set to determine.
Touch control system includes the second control module 220.Second control module 220 is connect with touch display screen 300, is used
Scanning signal is touched in providing to touch display screen 300, to detect the touch action in touch display screen 300, and from touch surface
Plate receives touch sensible signal, to generate touch control signal.Second control module 220 is, for example, contact control module, is touched
Control module obtains module, display control module for example including touch signal receiving module, touch information.For example, touch panel
On touch sensor touch action is converted into touch sensible signal, so that touch sensible signal is by touch signal receiving module
It receives.Touch information obtains module for obtaining information related with touch coordinate from touch sensible signal, for example including hand
The coordinate information of gesture information or touch point.Display control module is used to control display screen based on information related with touch coordinate
It is shown.In alternate embodiments, the second control module 220 is for example including touch signal receiving module and transmission module,
Transmission module is used to touch sensible signal being transmitted to display host.
Control module includes synchronization signal generation module 230 and micro-control unit (Microcontroller Unit, MCU)
231.Micro-control unit 231 is used to provide mode switching signal to synchronization signal generation module 230, to generate mould to synchronization signal
Block 230 provides mode switching signal, and mode switching signal includes touch-control display pattern signal and display pattern signal.Synchronization signal
Generation module 230 is for providing display synchronization signal to the first control module 210 and the second control module 220 respectively and touching same
Walk signal.When display synchronization signal is effective status, the first control module 210 is opened aobvious to provide to touch display screen 300
Show that scanning signal, touch sync signal are maintained at invalid state to close the second control module 220.In this embodiment, aobvious
When showing that synchronization signal is invalid, when touch detection signal is effective, the second control module 220 is provided to touch to touch display screen 300 and be swept
Signal is retouched, touch display screen 300 carries out touch scanning according to scanning signal is touched, therefore the frequency for carrying out touching scanning is to touch
Touch the frequency of synchronization signal.
Fig. 5 shows the signal timing diagram of control device according to an embodiment of the present invention.
In the T1 stage, i.e., when mode switching signal characterizes display pattern, such as control device power on it is initial complete or
After person resets, the display synchronization signal of synchronization signal generation module output is maintained at effective status, and touch sync signal is protected
It holds in invalid state.The display data that control device receives after the caching of certain depth, are transmitted in both the buffers
One control module.
In the T2 stage, i.e., when mode switching signal characterizes touch-control display pattern, micro-control unit triggers synchronization signal and produces
Raw module, sends display synchronization signal and touch sync signal to the first control module and the second control module respectively.Display is same
The state of step signal and touch sync signal switches between T21 and T22, and synchronization signal generation module is in display synchronization signal
The touch sync signal of effective status is generated when invalid state.
In the T21 stage, i.e., in the touch sync signal valid period, the second control module is provided to touch to touch display screen and be swept
Signal is retouched, the touch detection of full frame or a part of screen is carried out to touch display screen.First control module stopping at this time being postponed
Storage extracts data, while incoming display data cache in both the buffers, and after touching validity period, touch detection stops
Only.
In the T22 stage, i.e., in the display synchronization signal valid period, synchronization signal generation module is to have in display synchronization signal
The touch sync signal of invalid state is generated when effect state.First control module restarts to extract caching number from buffer
According to, and display scanning signal is sent to touch display screen, it is obtained in the display data that display scanning signal is provided by display host.
It is appreciated that the present invention is not limited to this, in this embodiment, T21 stage and T22 stage are alternately.It is replacing
In the embodiment in generation, there may also be certain time intervals between T21 stage and T22 stage, in the time interval, show
Show that synchronization signal and touch sync signal are held in invalid state, which is greater than 0.
It should be pointed out that Fig. 5 is suitable for schematical explanation, it cannot illustrate that touch sync signal is synchronous with display accordingly
Size, frequency, effective time and the touch sync signal of signal and the size relationship of display synchronization signal, it is effective when
Between proportionate relationship.
Fig. 6 shows the flow chart according to an embodiment of the present invention for touching display control method.
In step sl, judge whether to need to carry out touch detection.If so, thening follow the steps S3；If it is not, then executing
Step S2.For example, judged whether to need to carry out touch detection by the general control system of equipment, and the result of judgement is sent to micro-
Control unit.Such as during mobile phone power-on, then it is judged as and does not need to carry out touch detection, shows equipment operation mistake touching
Cheng Zhong is then judged as and needs to carry out touch detection.
In step s 2, the display synchronization signal for persistently generating effective status, carries out display driving.Micro-control unit controls
Synchronization signal generation module provides display synchronization signal to the first control module, and display synchronization signal is constantly in effective status,
And close touch sync signal.First control module is extracted data cached and aobvious to touch display screen offer from buffer
Show that scanning signal, the first control module show scanning signal according to data cached acquisition, so that the frequency for carrying out display scanning can
To realize dynamic change according to data cached parameter.
In step s3, display synchronization signal and touch sync signal are generated；When display synchronization signal is effective status,
Display scanning signal is provided to touch display screen according to display data, touch sync signal is maintained at invalid state；When display is same
When step signal is invalid state, is provided according to touch sync signal to touch display screen and touch scanning signal, touch sync signal
It is maintained at effective status.Synchronization signal generation module is respectively to the first control module letter synchronous with the offer display of the second control module
Number and touch sync signal, thus show scanning and touch scanning alternately.During touching scanning, the second control module pair
Touch display screen carries out the touch detection of full frame or a part of screen, the frequency for touch scanning of the second control module by
The frequency of touch sync signal determines that the frequency of touch sync signal is kept fixed, so that the frequency for touch scanning is also protected
Hold fixation.The first control module stops extracting from buffer data cached at this time, while incoming display data are in both the buffers
Caching.During showing scanning, the first control module restarts to extract data from buffer, the display of the first control module
Scanning signal is provided by display host, shows driving frequency dynamic change according to actual needs.Touch display screen basis respectively
Display scanning signal and touch scanning signal carry out showing scanning and touch scanning, display scanning signal and touch scanning signal
Frequency is uncorrelated, so that the frequency for carrying out display scanning is uncorrelated to the frequency of touch detection is carried out.
It is as described above according to the embodiment of the present invention, these embodiments details all there is no detailed descriptionthe, also not
Limiting the invention is only the specific embodiment.Obviously, as described above, can make many modifications and variations.This explanation
These embodiments are chosen and specifically described to book, is principle and practical application in order to better explain the present invention, thus belonging to making
Technical field technical staff can be used using modification of the invention and on the basis of the present invention well.The present invention is only by right
The limitation of claim and its full scope and equivalent.
Claims (11)
1. a kind of control method of touch display screen characterized by comprising
Generate display synchronization signal and touch sync signal；
When the display synchronization signal is effective status, display scanning letter is provided to the touch display screen according to data cached
Number, the touch sync signal is maintained at invalid state；
When the display synchronization signal is invalid state, touching is provided to the touch display screen according to the touch sync signal
Scanning signal is touched, the touch sync signal is maintained at effective status,
Wherein, the frequency of the display scanning signal is uncorrelated to the touch frequency of scanning signal.
2. control method according to claim 1, which is characterized in that when the display synchronization signal is invalid state,
The frequency for touching scanning signal is identical as the frequency of the touch sync signal.
3. control method according to claim 1, which is characterized in that further include:
Mode switching signal is generated,
When the mode switching signal characterizes display pattern, the display synchronization signal is maintained at effective status, the touch
Synchronization signal is maintained at invalid state.
4. control method according to claim 1, which is characterized in that further include:
When the display synchronization signal is invalid, display data are cached described data cached to obtain.
5. control method according to claim 4, which is characterized in that according to the ineffective time of the display synchronization signal and
The transmission speed of the display data sets cached parameters.
6. control method according to claim 5, which is characterized in that the cached parameters include caching depth.
7. a kind of control device of touch display screen characterized by comprising
First control module, for providing display scanning signal to the touch display screen according to data cached；
Second control module touches scanning signal for providing according to touch sync signal to the touch display screen；And
Synchronization signal generation module, for sending display synchronization signal to first control module, Xiang Suoshu second controls mould
Block sends the touch sync signal,
Wherein, when the display synchronization signal is effective status, first control module is opened to provide the display and sweep
Signal is retouched, the touch sync signal is maintained at invalid state.
8. control device according to claim 7, which is characterized in that the frequency and the touch for touching scanning signal
The frequency of synchronization signal is identical.
9. control device according to claim 7, which is characterized in that further include: micro-control unit is used for the synchronization
Signal generator module provides mode switching signal,
When the mode switching signal characterizes touch-control display pattern, the synchronization signal generation module is in the synchronous letter of the display
Number be invalid state when generate effective status the touch sync signal, the display synchronization signal be effective status when produce
The touch sync signal of raw invalid state,
When the mode switching signal characterizes display pattern, the synchronization signal generation module is in the display synchronization signal
The touch sync signal of invalid state is generated when effective status.
10. control device according to claim 7, which is characterized in that further include:
Buffer is connected with first control module, for receiving display data, and according to display data acquisition
It is data cached,
When the display synchronization signal is effective, the buffer receives the display data and obtains described data cached, institute
It is described data cached from buffer extraction to state the first control module,
When the display synchronization signal is invalid, the buffer persistently receives and caches the display data, described in obtaining
It is data cached.
11. control device according to claim 10, which is characterized in that the buffer includes push-up storage.
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| CN111968582A (en) * | 2020-01-14 | 2020-11-20 | Oppo广东移动通信有限公司 | Display screen frequency conversion method, DDIC chip, display screen module and terminal |
| CN112530334A (en) * | 2019-09-19 | 2021-03-19 | 联咏科技股份有限公司 | Electronic circuit for driving display panel with touch sensor |
| US11016608B2 (en) | 2018-03-27 | 2021-05-25 | Chipone Technology (Beijing) Co., Ltd. | Touch display control apparatus and touch display apparatus |
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| CN109828686B (en) | 2022-06-24 |
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