CN112162660B - Display panel debugging method and display panel - Google Patents
Display panel debugging method and display panel Download PDFInfo
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- CN112162660B CN112162660B CN202011161044.4A CN202011161044A CN112162660B CN 112162660 B CN112162660 B CN 112162660B CN 202011161044 A CN202011161044 A CN 202011161044A CN 112162660 B CN112162660 B CN 112162660B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- 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
The invention provides a debugging method of a display panel and the display panel. The invention obtains the frequency domain and the time domain position of the noise through the synchronous signal of the panel, and then can avoid the noise in the frequency domain and the time domain position when driving the driving waveform, and can improve the signal-to-noise ratio of the display panel.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel debugging method and a display panel.
Background
As shown in fig. 1 and fig. 2, most of the conventional flexible Active matrix organic light-emitting diode (AMOLED) touch display screens are of an on cell (a method of embedding the touch screen between a color filter substrate and a polarizer of the display screen, that is, configuring a touch sensor on a panel); the structure in fig. 1 is, from bottom to top: the array substrate 21, the anode 22, the display function layer 23, the cathode 24, the thin film encapsulation layer 25 and the touch layer 26, wherein the driving electrodes 20 and the sensing electrodes 10 in the touch layer 26 are usually Metal meshes (Metal Mesh), and the patterns of the touch electrodes (the driving electrodes 20 and the sensing electrodes 10) are directly fabricated on the upper surface of the thin film encapsulation layer 25 of the flexible AMOLED, and meanwhile, since the Metal meshes are opaque, the Metal Mesh lines should be kept away from R/G/B light emitting pixels of the lower array substrate 21 (as shown in fig. 3) during design. Generally, the metal mesh touch electrode is a bridge structure, wherein the driving electrode 20 and the sensing electrode 10 are located on the same layer, the driving electrode 20 and the sensing electrode 10 are electrically insulated at the cross position, the driving electrodes located at two sides of the sensing electrode are connected together through a conductive bridge, the isolated TX electrode sub-units are connected together through a conductive bridge, and the metal bridge also avoids the R/G/B light emitting pixel points below.
In the scheme, the touch electrode is directly manufactured on the upper surface of the thin film packaging layer of the flexible OLED, so that the distance from the cathode of the panel is very small and is only about 10 um. The voltage range of the driving waveform signal of the driving electrode is between 3.3v and 12v, and the voltage range of the driving waveform signal of the induction electrode is between 1.8v and 6 v; because the distance between the touch electrode and the cathode of the panel is very short, the parasitic capacitance (Cp) between the touch electrode and the cathode electrode is large, and meanwhile, the sub-pixel display signals of the array substrate are easy to crosstalk to the touch electrode layer, so that very large signal noise interference is formed. Because the effective electrode area of the touch electrode of the hollowed-out metal grid is small, the capacitance signal quantity of the touch electrode is very small, and when large signal noise interference is encountered, the touch signal which is weak per se can not be sensed easily, so that the touch function is invalid.
Touch performance has several key indexes, the most key index is signal-to-noise ratio (SNR), and for flexible AMOLED, how to improve SNR is a problem that needs to be solved at present, and the level of SNR is also related to a debugging method of touch firmware, which determines a scanning mode of a driving signal and a coordinate calculation method of a working chip.
Therefore, it is desirable to provide a display panel debugging method and a display panel, which can improve the signal-to-noise ratio of the display panel.
Disclosure of Invention
The invention provides a display panel debugging method, which enables a driving signal to avoid noise by setting a delay time, thereby improving the signal-to-noise ratio of a display panel.
In order to achieve the above object, the present invention provides a method for debugging a display panel, comprising: the method comprises the steps of obtaining signal noise of a touch electrode of a display panel under different pictures, wherein the signal noise is generated by sub-pixel display coupling of the touch electrode below the touch electrode; a first analysis step, namely performing time domain waveform analysis on the signal noise to obtain a plurality of waveform diagrams of the signal noise, and acquiring a noise time domain of the signal noise corresponding to a synchronous signal displayed by the display panel; a conversion step, analyzing and converting the oscillograms of the signal noises into corresponding spectrograms; a second analysis step, which is to quantitatively analyze the frequency point positions of the multiple signal noises according to the spectrogram; and an input step of inputting a preset driving waveform to the touch electrode, and setting a delay time at the position of the synchronous signal corresponding to the noise, wherein the delay time is used for enabling the starting point of the driving waveform to be within a certain frame of display time and avoiding the noise time domain, and the frequency of the driving waveform avoids the frequency point of the signal noise.
Further, the first analyzing step specifically includes: an acquisition step, acquiring a waveform diagram of signal noise according to pictures of different display voltage jumps; a third analysis step, namely checking the voltage amplitude in the oscillogram of the signal noise and finding out a peak larger than a voltage threshold; a grabbing step, grabbing a noise time domain of the peak corresponding to the synchronous signal displayed by the display panel;
further, the range of the voltage threshold is 300-500 mv; and/or the synchronization signal comprises a horizontal synchronization signal and a vertical synchronization signal.
Further, the spike corresponds to a time difference between a rising edge and a falling edge of the synchronization signal; the period of the spike is positively correlated with the period of the synchronization signal.
Further, in the inputting step, if the time for noise to appear in the certain frame display time does not satisfy the time required for driving the complete driving waveform, the method for debugging the display panel further includes: a signal conversion step of converting the time domain noise signal into a frequency domain noise signal; and a frequency hopping step, namely switching the working frequency point of the chip to a working frequency point with smaller noise for working.
Further, in the inputting step, if the time of noise occurrence in the certain frame display time cannot satisfy the time required for inputting the complete driving waveform, the method for debugging the display panel further includes: a setting step of setting the drive waveform into a set containing a plurality of different frequency waveforms.
Further, the working frequency range of the driving waveform is between 200Khz and 300 Khz.
Further, the driving waveform includes: a self-induction signal and a common induction signal; the self-induction signal comprises a continuous square wave or sine wave; the common induction signal comprises a continuous square wave or sine wave; the waveform voltage of the common induction signal is greater than the waveform voltage of the self-induction signal.
Further, the voltage range of the self-induction signal is 0-3.3 v; the voltage range of the common response signal is 6-12 v.
The invention also provides a display panel, wherein the preparation method adopted by the display panel comprises the debugging method of the display panel for debugging.
The invention has the beneficial effects that: according to the display panel and the debugging method thereof, the frequency domain and the time domain position of the noise are obtained, so that the noise can be avoided from the frequency domain and the time domain position when the driving waveform is input, and the signal-to-noise ratio of the display panel can be improved.
Drawings
The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.
Fig. 1 is a structural view of a related art display panel.
Fig. 2 is a schematic diagram of a touch electrode pattern in the prior art.
Fig. 3 is a schematic diagram of a touch electrode trace and a display pixel in the prior art.
Fig. 4 is a flowchart of a debugging method of a display panel according to an embodiment of the present invention.
Fig. 5 is a flowchart of a first analyzing step in a debugging method of a display panel according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of setting a delay time according to an embodiment of the present invention.
Fig. 7 is a waveform diagram of a driving signal according to an embodiment of the invention.
Fig. 8 is a flowchart of a debugging method of a display panel according to another embodiment of the invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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 following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Moreover, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
As shown in fig. 4, an embodiment of the present invention provides a method for debugging a display panel, in which a frequency domain and a time domain position of noise are obtained, so that the noise can be avoided from being located in the frequency domain and the time domain when a driving waveform is driven in, and the signal-to-noise ratio of the display panel can be improved.
The debugging method of the display panel comprises the following steps of S1-S7.
S1, an obtaining step, measuring and capturing signal noise of the touch electrode of a display panel under different pictures, wherein the signal noise is generated by sub-pixel display coupling of the touch electrode below the touch electrode to the touch electrode.
The structure of the display panel includes the on-cell structure shown in fig. 1. The touch electrode is of a metal grid structure.
Generally, the metal grid touch electrode is in a SITO bridging structure, wherein a driving electrode (TX) and a sensing electrode (RX) are located on the same layer, the driving electrode and the sensing electrode are electrically insulated at the cross position, the driving electrodes located at two sides of the sensing electrode are connected together through a conductive bridge, isolated TX electrode subunits are connected together through a conductive bridge, and the metal bridge also avoids R/G/B light emitting pixel points below.
S2, a first analysis step, namely, carrying out time domain waveform analysis on the signal noise to obtain a plurality of waveform diagrams of the signal noise, and acquiring a noise time domain of the signal noise corresponding to the synchronous signal displayed by the display panel.
As shown in fig. 5, the first analysis step specifically includes the following steps S201 to S203.
S201, collecting step, collecting waveform diagram of signal noise according to different display voltage jumping pictures.
The display voltage includes a source data voltage, and may specifically include a waveform diagram of noise under a picture such as 1W1B, 2W2B, etc., and the present invention does not limit the display voltage, which does not affect the invention point of the present invention.
S202, a third analysis step, namely checking the voltage amplitude in the waveform diagram of the signal noise and finding out a peak larger than a voltage threshold value.
The voltage threshold is 300-500 mv, and specifically may be 400 mv.
S203, a grabbing step of grabbing the noise time domain of the peak corresponding to the synchronous signal displayed by the display panel.
The synchronization signals include a horizontal synchronization signal (Hsync) and a vertical synchronization signal (Vsync).
The horizontal synchronization signal (Hsync) and the vertical synchronization signal (Vsync) provide reference points for the times when noise (spikes) occurs, i.e., the spikes correspond to the time difference between the rising and falling edges of the synchronization signal. And the period of the peak is positively correlated with the period of the synchronization signal, that is, the period of the occurrence of the peak-n, n being a positive integer.
In the debugging method, the noise takes Vsync and Hsync signals as a reference to confirm the time position and the reference of the appearance of the spike signal relative to the synchronous signal, and the reference is a period. Therefore, during subsequent debugging, the scanning signals of the driving signals are also based on the Vsync and Hsync signals, and corresponding setting can be carried out.
And S3, a conversion step, namely analyzing and converting the oscillograms of the signal noises into corresponding spectrogram.
The frequency points of the waveform of the signal noises, if captured, include 210Khz, 210/2Khz and 210/4 Khz.
And S4, performing a second analysis step, and obtaining the frequency point positions of the multiple signal noises according to the quantitative analysis of the spectrogram.
And S5, inputting a preset driving waveform to the touch electrode, and setting a delay time at the position of the synchronous signal corresponding to the noise, wherein the delay time is used for enabling the starting point of the driving waveform to be within a certain frame display time and avoiding the noise time domain, and the frequency of the driving waveform avoids the frequency point of the signal noise.
As shown in fig. 6, the present invention is explained by using waveform diagrams of consecutive frames of display waveforms (display), that is, after acquiring the waveform diagram of noise (noise) and the peak position from a frame (frame) of 1 frame to a next frame (next frame) by using the horizontal synchronization signal (Hsync) and the vertical synchronization signal (Vsync), a Delay Time (Delay Time) is finally set, so that the driving waveform can enter the smooth Time domain of the noise, i.e., avoid the peak position.
The drive waveform is typically driven into the drive electrode (TX) by the chip (TIC) of the panel.
The working frequency range of the driving waveform is between 200Khz and 300 Khz.
The working frequency of the driving waveform needs to be ensured to avoid the positions of the frequency points captured in the frequency domain analysis, namely the frequency points 210Khz, 210/2Khz and 210/4Khz, so that the influence of display noise on touch control is effectively avoided.
As shown in fig. 7, the driving waveform (TX signal) includes: a self-sensing signal (self-sensing signal) and a mutual-sensing signal (mutual-sensing signal).
The self-induction signal comprises a continuous square wave or sine wave; the common sense signal comprises a continuous square wave or sine wave; the common induction signal waveform voltage is greater than the self-induction signal waveform voltage.
The voltage range of the self-induction signal is 0-3.3 v; the voltage range of the common response signal is 6-12 v.
In the inputting step, if the time of noise occurrence in the certain frame display time cannot satisfy the time required for inputting the complete driving waveform, the method further includes:
s6, a signal conversion step, namely converting the time domain noise signal into a frequency domain noise signal;
and S7, frequency hopping, namely switching the working frequency point of the chip to a working frequency point with smaller noise for working.
If a chip has 5 working frequency bands, if the interference of the current working frequency point is large, the chip changes the working frequency point to work. Specifically, firstly, a time domain noise signal is converted into a frequency domain signal, and then, the TIC driving waveform is selected to work in the frequency point region by observing which frequency point has low noise.
The working frequency point of the chip generally refers to the frequency of a driving waveform; generally, the frequency of Tx coding waveforms sent by some chips (TICs) may fluctuate within a certain range, and different frequency points have a fundamental frequency difference, generally between 3K and 6K, for example, if the working interval is set to 120K to 300K, the fundamental frequency is 6K, and that IC has 30 frequency points.
As shown in fig. 8, the present invention further provides a debugging method of the display panel according to another embodiment, which includes steps S101 to S06, wherein steps S101 to S105 are the same as steps S1 to S5, except that in the inputting step, if the time of noise occurrence in the certain frame display time does not satisfy the time required for inputting the complete driving waveform, the processing manner is different, and the debugging method of the display panel according to another embodiment further includes:
s106, setting the driving waveform into a set containing a plurality of different frequency waveforms.
The invention also provides a display panel, and the preparation method adopted by the display panel comprises the debugging method of the display panel for debugging.
The display panel can acquire the frequency domain and the time domain position of the noise through the synchronous signal, so that the noise can be avoided at the frequency domain and the time domain position when the driving waveform is input, and the signal-to-noise ratio of the display panel can be improved.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The present invention has been described in detail, and the principle and the implementation of the present invention are explained by applying specific examples, and the description of the above examples is only used to help understanding the technical scheme and the core idea of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present invention in its embodiments.
Claims (10)
1. A debugging method of a display panel is characterized by comprising the following steps:
the method comprises the steps of obtaining signal noise of a touch electrode of a display panel under different pictures, wherein the signal noise is generated by sub-pixel display coupling of the touch electrode below the touch electrode;
a first analysis step of performing time domain waveform analysis on the signal noise to obtain a plurality of waveform diagrams of the signal noise and acquiring a noise time domain of the signal noise corresponding to the synchronous signal displayed by the display panel;
a conversion step, analyzing and converting the oscillograms of the signal noises into corresponding spectrograms;
a second analysis step, which is to quantitatively analyze the frequency point positions of the multiple signal noises according to the spectrogram;
and an input step of inputting a preset driving waveform to the touch electrode, and setting a delay time at the position of the synchronous signal corresponding to the noise, wherein the delay time is used for enabling the starting point of the driving waveform to be within a certain frame of display time and avoiding the noise time domain, and the frequency of the driving waveform avoids the frequency point of the signal noise.
2. The debugging method of a display panel according to claim 1,
the first analyzing step specifically includes:
an acquisition step, acquiring a waveform diagram of signal noise according to pictures of different display voltage jumps;
an analysis step, namely checking the voltage amplitude in the oscillogram of the signal noise and finding out a peak larger than a voltage threshold;
and a grabbing step of grabbing a noise time domain of the peak corresponding to the synchronous signal displayed by the display panel.
3. The debugging method of a display panel according to claim 2,
the range of the voltage threshold is 300-500 mv; and/or the presence of a gas in the gas,
the synchronization signal includes a horizontal synchronization signal and a vertical synchronization signal.
4. The debugging method of a display panel according to claim 2,
the peak corresponds to the time difference of the rising edge and the falling edge of the synchronous signal;
the period of the spike is positively correlated with the period of the synchronization signal.
5. The debugging method of a display panel of claim 2,
in the inputting step, if the time of noise occurrence in the certain frame display time cannot satisfy the time required for inputting the complete driving waveform, the method further includes:
a signal conversion step of converting the time domain noise signal into a frequency domain noise signal;
and a frequency hopping step, namely switching the working frequency point of the chip to a working frequency point with smaller noise for working.
6. The debugging method of a display panel according to claim 2,
in the inputting step, if the time of noise occurrence in the certain frame display time cannot satisfy the time required for inputting the complete driving waveform, the method further includes:
a setting step of setting the drive waveform into a set containing a plurality of different frequency waveforms.
7. The debugging method of a display panel according to claim 1,
the working frequency range of the driving waveform is 200-300 Khz.
8. The debugging method of a display panel of claim 1,
the drive waveform includes: a self-induced signal and a common induced signal;
the self-induced signal comprises a continuous square wave or sine wave;
the common induction signal comprises a continuous square wave or sine wave;
the waveform voltage of the common induction signal is larger than that of the self-induction signal.
9. The debugging method of a display panel according to claim 8,
the voltage range of the self-induction signal is 0-3.3 v;
the voltage range of the common induction signal is 6-12 v.
10. A display panel, wherein the display panel is debugged by the method according to any one of claims 1 to 9.
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| CN108646939A (en) * | 2018-04-20 | 2018-10-12 | 武汉华星光电半导体显示技术有限公司 | A kind of touch electrode structure and touch panel |
| WO2020050634A1 (en) * | 2018-09-06 | 2020-03-12 | 주식회사 하이딥 | Touch sensor panel driving method and touch input device |
| CN111413819A (en) * | 2020-04-17 | 2020-07-14 | Tcl华星光电技术有限公司 | Display panel and display device |
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| TW201344535A (en) * | 2012-04-16 | 2013-11-01 | Novatek Microelectronics Corp | Touch control apparatus and touch detection method thereof |
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| CN108646939A (en) * | 2018-04-20 | 2018-10-12 | 武汉华星光电半导体显示技术有限公司 | A kind of touch electrode structure and touch panel |
| WO2020050634A1 (en) * | 2018-09-06 | 2020-03-12 | 주식회사 하이딥 | Touch sensor panel driving method and touch input device |
| CN111413819A (en) * | 2020-04-17 | 2020-07-14 | Tcl华星光电技术有限公司 | Display panel and display device |
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