CN115691412A

CN115691412A - Touch display chip, touch display device, terminal equipment and display driving method

Info

Publication number: CN115691412A
Application number: CN202211029427.5A
Authority: CN
Inventors: 王强; 项大林; 王子箬; 顾品超
Original assignee: Beijing Orende Microelectronics Technology Co ltd
Current assignee: Beijing Orende Microelectronics Technology Co ltd
Priority date: 2022-08-25
Filing date: 2022-08-25
Publication date: 2023-02-03

Abstract

The invention discloses a touch display chip, a touch display device, terminal equipment and a display driving method, wherein the display driving method comprises the following steps: receiving image data and providing a plurality of paths of source electrode data signals according to the image data; detecting whether the output of the multi-channel source electrode data signals is a high-noise picture or not; and adjusting the driving mode of the display driving circuit according to the detection result. The driving mode of the display driving circuit is adjusted for the high-noise picture so as to reduce the integral jump of the data signal in the source electrode data line, and therefore the noise of the touch electrode layer is reduced.

Description

Touch display chip, touch display device, terminal equipment and display driving method

Technical Field

The invention relates to the technical field of touch display, in particular to a touch display chip, a touch display device, terminal equipment and a display driving method.

Background

In the existing touch display device, a touch sensor layer can be prepared on an OLED film packaging layer by means of etching, spin coating and the like, so that a display-touch integrated scheme is realized. The scheme has the advantages of thin thickness, easiness in flexible deformation, low cost and the like, and is widely applied to small-size markets in OLEDs.

However, the vertical distance between the touch sensor layer and the display cathode in the touch display device is only 7 um-15 um, and the cathode electrode is reused in the touch display process; parasitic capacitance is generated between the cathode electrode and the source electrode data lines, when data signals in the source electrode data lines jump integrally, the cathode electrode voltage is caused to fluctuate and is coupled to the touch layer, namely, noise which interferes with the touch sensing effect is generated, and the larger the amplitude of the data signals in the adjacent source electrode data lines is, the stronger the interference on the touch sensing effect is.

The existing touch technology of the OLED display screen generally adopts frequency hopping or synchronization and other modes to avoid noise, but certain requirements are imposed on noise intensity, and when the touch noise intensity of all frequency bands is large, a touch point false alarm event is caused. For example, when the display device displays a screen with black and white stripe intervals, the data signal in each source data line on the display device fluctuates up and down at the same time, the noise value coupled to the touch sensor layer is also the largest at this time, and when the gray scale of the display screen is higher, the noise is larger, and the touch screen is more prone to generating false alarm points.

Disclosure of Invention

In view of the foregoing problems, an object of the present invention is to provide a touch display chip, a touch display device, a terminal device and a display driving method, so as to solve the technical defects mentioned in the prior art.

According to an aspect of the present invention, there is provided a display driving method including:

receiving image data and providing a plurality of paths of source electrode data signals according to the image data;

detecting whether the output of the multi-channel source electrode data signals is a high-noise picture or not;

and adjusting the driving mode of the display driving circuit according to the detection result.

Optionally, the adjusting the driving mode of the display driving circuit according to the detection result includes:

when the detection result is a normal picture, adopting a first dimming mode or a second dimming mode;

and when the detection result is a high-noise picture, adopting a third dimming mode or a fourth dimming mode.

Optionally, the first dimming mode is DC dimming;

the second dimming mode is PWM dimming when the display is in a first gray scale voltage range, and DC dimming when the display is in a second gray scale voltage range;

the third dimming mode is PWM dimming;

the fourth dimming mode is DC dimming when displaying in the first gray scale voltage range and PWM dimming when displaying in the second gray scale voltage range.

Optionally, the adjusting the driving mode of the display driving circuit according to the detection result further includes:

when the detection result is a high-noise picture, reducing the gray scale voltage in the source data signal;

storing the initial gray scale brightness value before the reduction of the gray scale voltage and the current gray scale brightness value after the reduction of the gray scale voltage;

and adjusting the current gray scale brightness value until the current gray scale brightness value is consistent with the initial gray scale brightness value.

Optionally, the adjusting the current gray scale brightness value includes:

the number of power pulse signals per unit time and/or the duty ratio of the on and off times of the power pulse signals is increased.

Optionally, after the reducing the gray scale voltage in the source data signal, the method further includes: and simulating and detecting the waveform of the source data signal, and judging whether the noise intensity of the source data signal exceeds a first preset threshold value.

Optionally, if the noise level of the source data signal is greater than a first predetermined threshold, the step of reducing the grayscale voltage in the source data signal is continuously performed until the noise level of the source data signal is less than or equal to the first predetermined threshold.

Optionally, the detecting whether the multiple source signal outputs are high-noise pictures comprises:

judging whether the number of signals outputting the same waveform in all source electrode lines in the display driving circuit is larger than a second preset threshold value or not, and whether the maximum amplitude value between the high level and the low level of the signals outputting the same waveform in all source electrode data lines is larger than a third preset threshold value or not, and if not, judging that the picture is a normal picture;

if yes, continuously judging that all the source electrode data lines output any signal with the same waveform

Whether the time occupied by the level or the low level is greater than a fourth threshold value or not is judged to be a normal picture if not; if yes, the picture is judged to be a high-noise picture.

Optionally, in the case of determining that the image is a high-noise image, whether a source data signal output by any one of the source data lines and a source data signal output by a source data line around the source data line have a relative inversion signal is further detected, and if the relative inversion signal exists, the determination result is corrected to be a normal image; if the opposite reverse signal does not exist, the image is still judged to be a high-noise image.

According to another aspect of the present invention, there is provided a touch display chip, including: a display drive circuit for performing display control,

wherein the display driving circuit comprises a source driver, an image detection module and a dimming module,

the source driver is used for providing a plurality of paths of source data signals to the plurality of source data lines according to image data,

the image detection module is used for detecting whether the multi-channel source electrode data signal output is a high-noise picture,

the dimming module is used for adjusting the driving mode of the display driving circuit according to the judgment result of the image detection module.

Optionally, the display driving circuit further includes a source voltage control module, configured to adjust a grayscale voltage in the source data signal according to a detection result of the image detection module.

Optionally, the dimming module comprises a brightness detection module and a brightness compensation module,

the brightness detection module is used for detecting the brightness of the image displayed by the display panel and ensuring the brightness

And storing gray scale brightness values before and after the adjustment of the source data signal, wherein the brightness compensation module is used for performing brightness compensation according to the gray scale brightness values before and after the adjustment of the source data signal.

Optionally, the method further comprises: a touch driving circuit for performing touch detection,

wherein, the touch driving circuit further comprises: and the noise detection module is used for simulating and detecting the waveform of the source electrode data signal and feeding back a detection result to the source electrode voltage control module.

According to still another aspect of the present invention, there is provided a touch display device including:

a touch display panel;

and the touch display driving chip is used for providing driving and/or touch detection signals for the touch display panel.

Optionally, a display panel of the touch display panel is any one of an organic light emitting diode touch display panel, a quantum dot light emitting diode touch display panel, a mini light emitting diode touch display panel, and a micro light emitting diode touch display panel.

According to a further aspect of the present invention, a terminal device is provided, wherein the terminal device comprises the touch display device according to the above claims.

The display driving method provided by the invention adjusts the high-noise picture into PWM dimming during high gray scale display so as to reduce the integral jumping of the data signal in the source electrode data line, thereby reducing the noise of the touch control electrode layer.

In a preferred embodiment, the brightness of the image displayed by the display panel is detected by the brightness detection module, and the gray scale brightness values before and after adjustment are stored; the brightness compensation module is used for carrying out brightness compensation according to the gray scale brightness values before and after adjustment, so that when the image data is a high-noise image, the gray scale voltage is adjusted, noise interference is reduced, and the whole display brightness is ensured to be unchanged.

In a preferred embodiment, the noise detection module is added in this embodiment, and a feedback path of noise determination is formed simultaneously through joint determination of the display driving circuit and the touch detection circuit, that is, the image detection module in the display driving circuit determines that the image data is a high-noise picture, and further detects the output data signal through the noise detection module in the touch detection circuit, and controls the source driving circuit to reduce the grayscale voltage until the detection result of the noise detection module on the output data signal is a non-high-noise signal, so as to further increase the precision of adjusting the high-noise picture.

In a preferred embodiment, the above embodiment determines the stripe width, stripe voltage value, and stripe width of the image display by determining the relationship between the maximum amplitude between the high level and the low level of the signal outputting the same waveform in all the source data lines, and the time taken for any one of the high level and the low level of the signal outputting the same waveform in all the source lines, and a preset threshold, and determines that the image is a high-noise image when the three exceed the preset values at the same time.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

fig. 1a shows a schematic three-dimensional segmentation of a touch display device according to the prior art;

FIG. 1b shows a schematic plan view of a touch display panel according to the prior art;

fig. 2 is a flowchart illustrating a display driving method according to a first embodiment of the present invention.

FIG. 3a is a block diagram of a touch display device according to a second embodiment of the invention;

fig. 3b shows a flowchart of a display driving method according to a third embodiment of the present invention;

FIG. 4a is a block diagram of a touch display device according to a fourth embodiment of the invention;

fig. 4b shows a flowchart of a display driving method according to a fifth embodiment of the present invention;

FIG. 5a is a block diagram of a touch display device according to a sixth embodiment of the invention;

fig. 5b is a flow chart of a display driving method according to a seventh embodiment of the present invention;

fig. 6 shows a flowchart of a high-noise picture determination method according to an eighth embodiment of the present invention;

Detailed Description

Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. In the various figures, identical elements or modules are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.

It should be understood that in the following description, "circuitry" may comprise singly or in combination hardware circuitry, programmable circuitry, state machine circuitry, and/or elements capable of storing instructions executed by programmable circuitry. When an element or circuit is referred to as being "connected to" another element or circuit is referred to as being "connected between" two nodes, it may be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that there are no intervening elements present.

Also, certain terms are used throughout the description and claims to refer to particular components. As one of ordinary skill in the art will appreciate, manufacturers may refer to a component by different names. This patent specification and claims do not intend to distinguish between components that differ in name but not function.

In the present application, the term "semiconductor structure" refers to the generic term for the entire semiconductor structure formed in the various steps of manufacturing a memory device, including all layers or regions that have been formed. In the following description, numerous specific details of the invention, such as structure, materials, dimensions, processing techniques and techniques of the devices are described in order to provide a more thorough understanding of the invention. However, as will be understood by those skilled in the art, the present invention may be practiced without these specific details.

Moreover, it is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

Fig. 1a shows a schematic perspective view of a touch display device according to the prior art;

referring to fig. 1a, the touch display device includes a display panel, a touch electrode layer, a source driver, a gate driver, a light emission control driver (which may not be provided depending on the circuit structure of the pixel unit), a touch driver, and a touch processor (which may be collectively referred to as a touch detection circuit).

when fig. 1a is combined with fig. 1b, the display panel 10 includes a plurality of gate lines G1 to Gm, a plurality of data lines S1 to Sn, a plurality of pixel regions 101, and a plurality of cathode electrodes disposed corresponding to the plurality of pixel regions 101, wherein m and n are positive integers, and the pixel regions 4 are connected to the gate lines Gm and the data lines Sn. The plurality of pixel regions include a plurality of pixel units corresponding thereto. The pixel unit includes a circuit of a capacitor, a switching element (e.g., TFT), and a light emitting element (e.g., organic electroluminescent device OLED), and in the display panel, the pixel unit controls the amount of current supplied to the OLED in response to a data signal supplied to the data line Sn when a scan signal is supplied to the gate line Gm.

The touch electrode layer 11 includes a plurality of touch driving lines TX and a plurality of touch sensing lines RX, and touch sensing units arranged in a two-dimensional matrix. Touching the touch sensing unit changes the capacitance or resistance of the touch sensing unit (depending on whether the touch sensing unit is a capacitive or resistive sensing unit), and the touch detection signal generated by the touched touch sensing unit is different from the touch detection signal generated by the touch sensing unit that is not touched. The position of the touched touch sensing unit can be determined according to the change of the touch detection signal.

However, the touch detection unit controls the cathode electrode to be reused as the cathode electrode in the touch state, so as to detect the induction capacitance of the touch display panel. Parasitic capacitance Cst is generated between the cathode electrode and the source data lines S1 to Sn, and when the data signals in the source data lines jump integrally, the cathode electrode voltage fluctuates and is coupled to the touch layer, which generates noise that interferes with the touch sensing effect, and the larger the amplitude of the data signal in the adjacent source data line is, the stronger the interference with the touch sensing effect is.

As shown in fig. 2, in order to solve the above-mentioned interference generated by the sensing effect of touch when the data signals in the plurality of source data lines jump integrally. A display driving method of the first embodiment is provided which can be applied, for example, in the touch display devices shown in fig. 3a, 4a, 5 a;

in step S01, image data is received and a plurality of source data signals are provided according to the image data.

The image data is sent from a system end, can be sent to a display driving circuit after the steps of compression, decompression and the like, and is subjected to operations of image amplification, AOD (active on display), sharpness, contrast and other parameters adjustment, and the like, and a source driving circuit in the display driving circuit provides a plurality of paths of data signals through a plurality of data lines S1-Sn.

In step S02, it is detected whether the multi-channel source signal output is a high noise picture.

In this step, the display drive circuit detects the source data signal, and if it is detected that the image data is a high-noise screen.

In step S03, the driving mode of the display driving circuit is adjusted according to the detection result.

And adjusting the driving mode of the touch display panel according to the detection result so as to reduce the interference on the touch sensing effect.

as shown in fig. 3a, in order to solve the interference caused by the sensing effect of touch when the data signals in the source data lines jump integrally, a touch display device according to a second embodiment of the present invention is provided;

the touch display device of the present embodiment includes a display panel 10, a touch electrode layer 11, a display driving circuit 20, and a touch detection circuit 30. The display panel 10 and the touch electrode layer 11 are integrated in the touch display panel, and are divided into two units for clearer representation; although each driving circuit for the touch display panel is separately shown in fig. 3a, each driving circuit may be integrated in one circuit as a driving circuit (e.g., a driving IC) as an example, for example, the display driving circuit and the touch detection circuit in the drawing may be integrated as a touch display driving chip for providing driving and/or touch detection signals to the touch display panel, and the driving chip may further include various calculation processing functions.

The display panel 10 includes a plurality of gate lines G1-Gm, a plurality of data lines S1-Sn, pixel units 2 of a plurality of pixel regions 4, organic light emitting diodes OLEDs of the plurality of pixel regions 4, and a plurality of cathode electrodes (not shown in the figure) disposed corresponding to the plurality of pixel regions 4, where m and n are positive integers, and the display panel 10 may be any one of an organic light emitting diode display panel, a quantum dot light emitting diode display panel, a mini light emitting diode display panel, and a micro light emitting diode display panel.

The display driving circuit 20 includes a gate driver 21, a source driver 22, an image detection module 23, and a dimming module 24.

The gate driver 21 is configured to provide a gate voltage to the touch display panel in a display state; the source driver 22 is configured to provide a data signal to the touch display panel in a display state; the image detection module 23 is configured to determine whether a picture output to the display panel 10 is a high-noise picture according to the multiple data signals provided by the source driver 22; the dimming module 24 is configured to perform a dimming operation according to the determination result of the image detection module 23.

The touch detection circuit 30 includes a touch detection unit 31 and a multiplexing unit 32. The multiplexing unit 32 is configured to control the cathode electrodes in the display panel to be multiplexed into a cathode electrode; the touch detection unit 31 is configured to detect an induced capacitance of the touch electrode layer 11.

In a preferred embodiment, the touch display chip further includes a timing controller 50 for providing a first control signal and a second control signal to the display driving circuit 20 and the touch detection circuit 30. The first control signal is used for controlling the touch display device to be in a display state; the second control signal is used for controlling the touch display device to be in a touch state.

Fig. 3b shows a flowchart of a display driving method according to a third embodiment of the present invention.

In step S101, image data is received.

The image data is sent from a system end, and can be sent to the display driving circuit 20 after the steps of compression, decompression and the like, and the image data is subjected to operations such as image amplification, AOD (audio on display), sharpness, contrast and other parameters adjustment, and the source driving circuit 22 in the display driving circuit 20 provides a plurality of data signals through a plurality of data lines S1 to Sn according to the image data.

In step S102, it is detected whether the image data is a high noise screen.

In this step, the image detection module 23 in the display driving circuit 20 detects the source data signal, and if it is detected that the image data is a high noise picture, the steps S103 and S105 are continuously performed, and if it is detected that the image data is not a high noise picture, for example, a picture displayed when a large number of high amplitude data signals of the same waveform appear in the source data signal in one frame of picture, the picture noise is large in this case, and the display of other data signals is affected.

In step S103, the dimming module invokes a first or second dimming mode,

when the image detection module 23 detects that the image data is a normal image, the dimming module 24 controls the display driving circuit 20 to enter a first dimming mode or a second dimming mode, in which the source voltage is normally output in the first dimming mode or the second dimming mode, the first dimming mode is, for example, full DC dimming, the second dimming mode is PWM (pulse width modulation) dimming when displaying in the first gray scale voltage range, and the DC dimming is performed when displaying in the second gray scale voltage range.

In step S104, the dimming module invokes the third or fourth dimming mode,

when the image detection module 23 detects that the image data is a high-noise image, the dimming module 24 controls the display driving circuit 20 to enter a third dimming mode or a fourth dimming mode, where the third dimming mode is, for example, full PWM dimming, the fourth dimming mode is, for example, DC dimming when displaying in the first gray scale voltage range, and PWM dimming when displaying in the second gray scale voltage range, and in the third dimming mode or the fourth dimming mode, the source voltage needs to be maintained under the high-noise image, the on-time of the emission control signal EM in the PWM dimming within one modulation cycle is increased, and the brightness of the output is ensured.

The gray scale voltage range is exemplified by 256 gray scale voltages, the first gray scale voltage range is the first 128 gray scale voltages, and the second gray scale voltage range is the second 128 gray scale voltages, which can be adjusted according to actual conditions, and the application is not limited thereto.

In step S104, the touch display panel is driven in the called dimming mode.

In this embodiment, the whole jump of the data signal in the source data line is reduced by adjusting the high-noise picture to PWM dimming during high gray scale display, so as to reduce the noise of the touch electrode layer.

as shown in fig. 4a, the touch display device provided in this embodiment is basically the same as the touch display device provided in the first embodiment, and therefore, the description thereof is omitted.

The difference is that in the present embodiment, the display driving circuit 20 in the touch display device further includes a source voltage control module 25, configured to adjust a display gray scale voltage according to a detection result of the image detection module 23, and the display gray scale voltage is no longer switched between the DC dimming mode and the PWM dimming mode through the dimming module, which is suitable for processing a high-noise image in the PWM dimming mode, for example, the source voltage control module 25 adjusts an amplitude of a source data signal by changing a register setting in the source driver 22, so as to adjust the display gray scale;

the dimming module 24 in the touch display device includes a brightness detection module 241 and a brightness compensation module 242, where the brightness detection module 241 is configured to detect brightness of an image displayed by the display panel and store gray-scale brightness values before and after adjustment, and the brightness compensation module 242 is configured to perform brightness compensation according to the gray-scale brightness values before and after adjustment, for example, by controlling the number of pulses in the dimming module 24 and a duty ratio of on and off time of an emission control signal to achieve brightness adjustment.

Fig. 4b shows a flowchart of a display driving method according to a fifth embodiment of the invention, which is performed by using the display driving circuit in the touch display device shown in fig. 4a, for example.

In step S201, image data is received.

The image data is sent from a system end, for example, and can be sent to the display driving circuit 20 after the steps of compression, decompression, etc., and the adjustment or operation of parameters such as image amplification, information screen display (AOD), sharpness, contrast, etc., and the source driving circuit 22 in the display driving circuit 20 provides multiple data signals through multiple data lines S1 to Sn.

In step S202, the initial gray-scale luminance value of the current image data is stored.

For example, the brightness detection module 421 detects the brightness of the image currently displayed on the display panel and stores the brightness value of the current image data, where for convenience of description, the initial brightness value is denoted as LV0, and this representation will be used later.

In step S203, it is detected whether the image data is a high noise screen.

In this step, the image detection module 23 in the display drive circuit 20 detects the source data signal, and if it is detected that the image data is a high noise screen, the process proceeds to step S204, and if it is detected that the image data is not a high noise screen, the process proceeds to step S207.

In step S204, the source driver circuit is controlled to lower the grayscale voltage;

when determining whether the image data is a high-noise image, the source driving circuit will decrease the gray scale voltage, and the brightness detection module 421 detects the brightness of the displayed image after being adjusted by the display panel and stores the brightness value of the current image data.

In step S205, it is determined whether the initial gray level luminance value is consistent with the current gray level luminance value,

step S207 is executed when the initial gray-scale brightness value LV0 is consistent with the current gray-scale brightness value LV1, otherwise, step S206 is executed when the initial gray-scale brightness value LV0 is inconsistent with the current gray-scale brightness value LV1 until the initial gray-scale brightness value LV0 is consistent with the current gray-scale brightness value LV 1.

In step S206, the brightness value of the current gray scale is adjusted by the brightness compensation module,

in the PWM dimming, for example, a power supply is connected to an Anode (Anode) terminal of the OLED, and then a Positive voltage or current is input, and a GND is connected to a cathode terminal. When the driving power is input, the power waveform is an ac power (voltage or current) of a PWM type. The brightness compensation module adjusts the Duty ratio (Duty ratio) of the on and off time of the power pulse signal between 0% and 100%, or adjusts the number of the power pulse signal in unit time, and when the current gray scale brightness value LV1 is lower than the initial gray scale brightness value LV0, the Duty ratio of the power waveform is increased or the number of the power pulse signal in unit time is increased, or vice versa.

In step S207, the touch display panel is driven in the current mode.

And if the image data is not a high-noise picture, directly driving the touch display panel to display the image data, and if the image data is a high-noise picture, driving the touch display panel in the adjusted current mode.

In the embodiment, the brightness of the image displayed by the display panel is detected by the brightness detection module 241, and the gray scale brightness values before and after adjustment are stored; the brightness compensation module 242 performs brightness compensation according to the gray scale brightness values before and after adjustment, so that when the image data is a high-noise image, the gray scale voltage is adjusted, noise interference is reduced, and the whole display brightness is ensured to be unchanged.

as shown in fig. 5a, the touch display device provided in this embodiment is basically the same as the touch display device provided in the third embodiment, and therefore, the description thereof is omitted.

The difference is that in the present embodiment, the touch detection circuit 30 in the touch display device further includes a noise detection module 33, which is used for detecting the noise intensity of the touch signal in the touch detection unit 31 and feeding back the detection result to the source voltage control module 25.

Fig. 5b is a flowchart illustrating a display driving method according to a seventh embodiment of the present invention;

the difference from the method flowchart shown in fig. 4b is that after the step S304 "controlling the source driving circuit to decrease the gray scale voltage" further includes a step S305 to determine whether the noise intensity is higher than a threshold, the noise detection module 33 simulates and detects the waveform of the data signal output by the source, determines whether the voltage difference value of the waveform of the data signal output by the source exceeds a predetermined threshold, if the noise intensity is higher than the predetermined threshold, the step S304 is returned to, the source driving circuit is continuously controlled to decrease the gray scale voltage until the noise intensity is smaller than or equal to the threshold, and the step S306 is continuously executed, wherein the specific value of the threshold may be adjusted according to the actual situation.

In this embodiment, a noise detection module is added, and a feedback path for noise determination is formed through joint determination of the display driving circuit and the touch detection circuit, that is, the image detection module in the display driving circuit determines that image data is a high-noise picture, and further the noise detection module in the touch detection circuit detects an output data signal, and controls the source driving circuit to reduce a gray scale voltage until a detection result of the noise detection module on the output data signal is a non-high-noise signal, so as to further increase precision of adjusting the high-noise picture.

Fig. 6 shows a flowchart of a high-noise picture determination method according to an eighth embodiment of the present invention; as shown in fig. 6, the flow chart of the high-noise picture determination method provided in this embodiment is implemented, for example, in the display driving circuit 20, the image detection module determines whether the image data is a high-noise picture.

In step S401, it is determined whether the number of signals outputting the same waveform in all source lines is greater than a predetermined threshold,

for example, the number of source electrodes outputting the same waveform in the source data lines S1-Sn is determined, for example, the number a of source electrodes outputting the same waveform in any frame is determined, where a is greater than b, the next step S402 is continuously performed, if a is less than or equal to b, the detection is exited, and step S405 is performed to normally output the frame, so as to determine the width of the stripe displayed on the frame. The preset threshold b is, for example, 1/8, 1/4, 1/2 of the total number of columns n, and is specifically determined according to the actual noise intensity of the display panel, which is not limited in this application.

In step S402, it is determined that the maximum amplitude between the high level and the low level of the signal outputting the same waveform in all the source data lines is greater than a preset threshold,

for example, it is determined that the maximum amplitude between the high level and the low level of the signal outputting the same waveform in all the source data lines S1 to Sn is greater than a preset threshold, when the maximum amplitude is greater than the preset threshold, the next step S403 is continuously performed, when the maximum amplitude is less than or equal to the preset threshold, the detection is exited, and step S405 is performed, and the image is normally output, so as to determine the fringe voltage value displayed on the image.

In step S403, whether the high level or high level of any source signal satisfying step S1 is greater than a preset threshold within one frame,

for example, the time (also referred to as the number of lines) occupied by any signal high level or low level of the same waveform outputted from all source lines is determined, and it is assumed that in a certain frame, the time for any signal high level of the same waveform outputted from all source lines is c, and the preset threshold is d, (c and d are integral multiples of the frame synchronization signal time, and the preset threshold can be adjusted according to actual conditions, when the time for any signal high level of the same waveform outputted from all source lines is c and is greater than the preset threshold d, a high noise picture is determined, and when the time for any signal high level of the same waveform outputted from all source lines is c and is less than or equal to the preset threshold d, the detection is exited, step S405 is executed, and the picture is normally outputted, so as to determine the stripe voltage value displayed on the picture, and thereby determine the stripe width displayed on the picture.

In a preferred embodiment, the method further comprises detecting whether an inversion signal opposite to the Si output exists in a data signal output from any one of the data lines Si and Si ± n, and if the opposite inversion signal exists, correcting the judgment result to be a normal screen, and exiting the detection, wherein the Si ± n range may be set according to actual conditions, and is preferably 10.

In the above embodiment, the relationship between the maximum amplitude between the high level and the low level of the signal outputting the same waveform in all the source data lines S1 to Sn, and the time taken for outputting any one of the high level and the low level of the signal outputting the same waveform in all the source lines and the preset threshold is determined by determining the number of the sources outputting the same waveform in the source data lines S1 to Sn, so as to determine the stripe width, the stripe voltage value, and the stripe width of the image display, and when the three exceed the preset values at the same time, it is determined that the image is a high-noise image.

In an embodiment of the present invention, a terminal device is further provided, where the touch display device shown in fig. 3a, 4a, and 5a is installed on the terminal device, specifically, the terminal device may be any one of a smart phone, a smart watch, a tablet computer, a notebook computer, an all-in-one computer, and an access display device, which is not limited in this respect.

It should be noted that the words "during", "when" and "when 8230; \8230"; when used herein in relation to the operation of a circuit are not strict terms indicating an action that occurs immediately upon the start of a startup action, but rather there may be some small but reasonable delay or delays, such as various transmission delays, between it and the reaction action (action) initiated by the startup action. The words "about" or "substantially" are used herein to mean that the value of an element (element) has a parameter that is expected to be close to the stated value or position. However, as is well known in the art, there is always a slight deviation that makes it difficult for the value or position to be exactly the stated value. It has been well established in the art that a deviation of at least ten percent (10%) for a semiconductor doping concentration of at least twenty percent (20%) is a reasonable deviation from the exact ideal target described. When used in conjunction with a signal state, the actual voltage value or logic state (e.g., "1" or "0") of the signal depends on whether positive or negative logic is used.

In accordance with the present invention, as set forth above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The scope of the invention should be determined with reference to the appended claims and their equivalents.

Claims

1. A display driving method comprising:

2. The display driving method according to claim 1, wherein the adjusting the driving mode of the display driving circuit according to the detection result comprises:

3. The display driving method according to claim 2, wherein the first dimming mode is DC dimming;

the third dimming mode is PWM dimming;

4. The display driving method according to claim 1, wherein the adjusting the driving mode of the display driving circuit according to the detection result further comprises:

5. The display driving method according to claim 4, wherein adjusting the present gray scale luminance value comprises:

increasing the number of power pulse signals per unit time and/or increasing the duty cycle of the on and off times of the power pulse signals.

6. The display driving method according to claim 4, wherein the step of reducing the gray scale voltage in the source data signal further comprises: and simulating and detecting the waveform of the source data signal, and judging whether the noise intensity of the source data signal exceeds a first preset threshold value.

7. The display driving method according to claim 6, wherein if the noise intensity of the source data signal is greater than a first predetermined threshold, the step of reducing the gray scale voltage in the source data signal is continued until the noise intensity of the source data signal is less than or equal to the first predetermined threshold.

8. The display driving method according to claim 1, wherein detecting whether the multiplexed source signal output is a high-noise picture comprises:

judging whether the number of signals outputting the same waveform in all source electrode lines in the display driving circuit is larger than a second preset threshold value or not, and whether the maximum amplitude between the high level and the low level of the signals outputting the same waveform in all source electrode data lines is larger than a third preset threshold value or not, and if not, judging the display driving circuit to be a normal picture;

if yes, continuing to judge whether the time occupied by the high level or the low level of any signal of the same waveform output by all the source electrode data lines is greater than a fourth threshold value, and if not, judging the picture to be a normal picture; if yes, the picture is judged to be a high-noise picture.

9. The display driving method according to claim 8, wherein in a case where the determination is made in a high-noise screen, it is further detected whether a source data signal output from any one of the source data lines and a source data signal output from a source data line surrounding the source data line have a reverse signal with respect to each other, and if the reverse signal with respect to each other exists, a determination result is corrected to a normal screen; if the opposite reverse signal does not exist, the picture is still judged to be a high-noise picture.

10. A touch display chip, comprising: a display drive circuit for performing display control,

the image detection module is used for detecting whether the multi-channel source data signal output is a high-noise picture,

11. The touch display chip of claim 10, wherein the display driving circuit further comprises a source voltage control module for adjusting the gray scale voltage in the source data signal according to the detection result of the image detection module.

12. The touch display chip of claim 11, wherein the dimming module comprises a brightness detection module and a brightness compensation module,

the brightness detection module is used for detecting the brightness of an image displayed by the display panel and storing gray scale brightness values before and after adjustment of the source data signal, and the brightness compensation module is used for performing brightness compensation according to the gray scale brightness values before and after adjustment of the source data signal.

13. The touch display chip of claim 10, further comprising: a touch driving circuit for performing touch detection,

14. A touch display device, comprising:

a touch display panel;

and the touch display driver chip of any one of claims 9-13, configured to provide driving and/or touch detection signals to the touch display panel.

15. The touch display device of claim 14, wherein a display panel of the touch display panel is any one of an organic light emitting diode display panel, a quantum dot light emitting diode display panel, a mini light emitting diode display panel, and a micro light emitting diode display panel.

16. A terminal device, wherein the terminal device comprises the touch display device according to any one of claims 14 and 15.