CN105976761A - Pixel driving method and display panel - Google Patents
Pixel driving method and display panel Download PDFInfo
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- CN105976761A CN105976761A CN201610587193.4A CN201610587193A CN105976761A CN 105976761 A CN105976761 A CN 105976761A CN 201610587193 A CN201610587193 A CN 201610587193A CN 105976761 A CN105976761 A CN 105976761A
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- 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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Abstract
The invention discloses a pixel driving method and a display panel. The pixel driving method comprises the following steps: in the initialization phase, carrying out initialization on a source electrode and a drain electrode of a driving transistor; in the compensation phase, carrying out threshold voltage compensation on the driving transistor; in the writing phase, writing a data signal of a data signal end into a grid electrode of the driving transistor; in the multiple-pulse signal generation phase, generating a multiple-pulse signal corresponding to an image to be displayed; and in the light-emitting phase, utilizing the multiple-pulse signal corresponding to the image to be displayed to control a light-emitting device to emit light, so that under the condition of not changing switching voltage of the driving transistor, brightness of the light-emitting device is adjusted dynamically, self-adaptive dynamic brightness adjustment is realized, power consumption of the display product can be reduced, and meanwhile, hysteresis effect due to change of the switching voltage of the driving transistor is prevented.
Description
Technical Field
The invention relates to the technical field of display, in particular to a pixel driving method and a display panel.
Background
With the progress of Display technology, Organic Light Emitting Diode (OLED) is one of the hot spots in the current field of flat panel Display research, and more Active Matrix Organic Light Emitting Diode (AMOLED) Display panels enter the market, and compared with the conventional Thin Film Transistor Liquid Crystal Display (TFT LCD), the AMOLED has faster response speed, higher contrast ratio and wider viewing angle.
In general, the energy consumption of the OLED display device is related to the display screen, and the higher the display brightness of the display screen is, the larger the driving current required by each pixel is, and thus the power consumption of the OLED display device is larger. In addition, the driving transistor in the pixel circuit has a problem of hysteresis, which results in poor quality of the display screen. As shown in fig. 1, the display luminance curves obtained from the dark to bright display (indicated by a solid line) and the bright to dark display (indicated by a dashed line) of the display screen may not be consistent, and the quality of the display screen may be affected by the non-overlapping phenomenon.
Therefore, how to reduce the power consumption of the OLED display product and improve the effect of the hysteresis of the driving transistor on the display screen is an urgent technical problem to be solved by those skilled in the art.
Disclosure of Invention
The embodiment of the invention provides a pixel driving method and a display panel, which are used for reducing the power consumption of an OLED display product and improving the influence of the delay of a driving transistor on a display picture.
The embodiment of the invention provides a pixel driving method, which comprises the following steps:
in the initialization stage, a switching transistor in the pixel circuit is conducted under the control of a light-emitting signal control end, and a source electrode of a driving transistor is initialized through an initialization signal of a power signal end; the writing transistor is conducted under the control of the scanning signal end, and the grid electrode of the driving transistor is initialized through the initialization signal of the data signal end;
in the compensation stage, the switch transistor is conducted under the control of the light-emitting signal control end, and the threshold voltage compensation is carried out on the driving transistor through a power supply signal of the power supply signal end;
in a writing stage, the writing transistor is conducted under the control of the scanning signal end, and a data signal of the data signal end is written into the grid electrode of the driving transistor;
further comprising:
in a multi-pulse signal generation stage, converting the pixel signal of the image to be displayed into brightness data, and analyzing and calculating the brightness data to obtain a multi-pulse signal corresponding to the image to be displayed;
in the light-emitting stage, inputting the multi-pulse signal to the light-emitting signal control end; the driving transistor is conducted under the control of the data signal written in the grid electrode; the switch transistor outputs a power supply signal of the power supply signal end to the input end of the light-emitting device through the conducted driving transistor under the control of a multi-pulse signal input by the light-emitting signal control end, and the light-emitting brightness of the light-emitting device is adjusted.
In a possible implementation manner, in the pixel driving method provided by an embodiment of the present invention, the converting a pixel signal of the image to be displayed into luminance data, and analyzing and calculating the luminance data to obtain a multi-pulse signal corresponding to the image to be displayed specifically includes:
converting each pixel signal of the image to be displayed into brightness data corresponding to each pixel according to a preset lookup table;
summing the brightness data corresponding to each pixel, dividing the sum by the number of total sub-pixels to obtain an average brightness value, and multiplying the average brightness value by a data bit width to obtain a gain value corresponding to the image to be displayed;
and determining the multi-pulse signal corresponding to the gain value according to a preset data table of the gain value and the pulse signal.
In a possible implementation manner, in the above-mentioned pixel driving method provided by an embodiment of the present invention, a conversion relationship between each pixel signal and luminance data in the preset lookup table may be represented by the following conversion formula:
where XYZ is a color space, RGB is sub-pixels, and M is a conversion array.
In a possible implementation manner, in the above pixel driving method provided by an embodiment of the present invention, the correspondence data table includes: a plurality of preset gain value intervals and a plurality of pulse waveforms;
each preset gain value interval corresponds to one pulse mode.
An embodiment of the present invention provides a display panel, including: a pixel circuit having a driving transistor, a switching transistor, a writing transistor, and a light emitting device, and an image processing module; wherein,
the source electrode of the switch transistor is connected with the power signal end, the grid electrode of the switch transistor is connected with the light-emitting signal control end, and the drain electrode of the switch transistor is connected with the source electrode of the driving transistor;
the grid electrode of the driving transistor is connected with the drain electrode of the writing transistor, and the drain electrode is connected with the input end of the light-emitting device;
the grid electrode of the writing transistor is connected with a scanning signal end, and the source electrode of the writing transistor is connected with the data signal end;
in an initialization stage, the switch transistor is switched on under the control of the light-emitting signal control end, and the source electrode of the driving transistor is initialized through an initialization signal of the power signal end; the writing transistor is conducted under the control of the scanning signal end, and the grid electrode of the driving transistor is initialized through the initialization signal of the data signal end;
in the compensation stage, the switch transistor is conducted under the control of the light-emitting signal control end, and the threshold voltage compensation is carried out on the driving transistor through a power supply signal of the power supply signal end;
in a writing stage, the writing transistor is conducted under the control of the scanning signal end, and a data signal of the data signal end is written into the grid electrode of the driving transistor;
in a multi-pulse signal generation stage, an image processing module converts pixel signals of the image to be displayed into brightness data, and analyzes and calculates the brightness data to obtain multi-pulse signals corresponding to the image to be displayed;
in the light-emitting stage, inputting the multi-pulse signal to the light-emitting signal control end; the driving transistor is conducted under the control of the data signal written in the grid electrode; the switch transistor outputs a power supply signal of the power supply signal end to the input end of the light-emitting device through the conducted driving transistor under the control of a multi-pulse signal input by the light-emitting signal control end, and the light-emitting brightness of the light-emitting device is adjusted.
In a possible implementation manner, in the display panel provided by an embodiment of the present invention, the image processing module includes: the device comprises a conversion module, a calculation module and a determination module; wherein,
the conversion module is used for converting each pixel signal of the image to be displayed into brightness data corresponding to each pixel according to a preset lookup table;
the calculation module is used for summing the brightness data corresponding to each pixel, dividing the sum by the number of total sub-pixels to obtain an average brightness value, and multiplying the average brightness value by a data bit width to obtain a gain value corresponding to the image to be displayed;
the determining module is used for determining the multi-pulse signal corresponding to the gain value according to a preset data table corresponding to the gain value and the pulse signal.
In a possible implementation manner, in the display panel provided by the embodiment of the present invention, a conversion relationship between each pixel signal and luminance data in the preset lookup table may be represented by the following conversion formula:
where XYZ is a color space, RGB is sub-pixels, and M is a conversion array.
In a possible implementation manner, in the display panel provided in an embodiment of the present invention, the correspondence data table includes: a plurality of preset gain value intervals and a plurality of pulse waveforms;
each preset gain value interval corresponds to one pulse mode.
In a possible implementation manner, in the display panel provided in an embodiment of the present invention, the pixel circuit further includes: a first capacitor and a second capacitor; wherein,
the first capacitor is connected between the grid electrode and the drain electrode of the driving transistor;
the second capacitor is connected between the input end and the output end of the light-emitting device.
The embodiment of the invention has the beneficial effects that:
the embodiment of the invention provides a pixel driving method and a display panel, wherein the pixel driving method comprises the following steps: initializing a source and a drain of the driving transistor in an initialization stage; performing threshold voltage compensation on the driving transistor in a compensation stage; writing a data signal of the data signal terminal into the gate of the driving transistor in a writing stage; converting pixel signals of an image to be displayed into brightness data in a multi-pulse signal generation stage, and analyzing and calculating the brightness data to obtain multi-pulse signals corresponding to the image to be displayed; inputting a multi-pulse signal to a light-emitting signal control terminal in a light-emitting stage; the driving transistor is conducted under the control of a data signal written in the grid electrode; the switch transistor outputs the power supply signal of the power supply signal end to the input end of the light-emitting device through the conducted driving transistor under the control of the multi-pulse signal input by the light-emitting signal control end, and the light-emitting brightness of the light-emitting device is adjusted. Therefore, the corresponding multi-pulse signals are generated according to the image data to be displayed, the multi-pulse signals corresponding to the image data to be displayed are adopted to control the light-emitting device to emit light in the light-emitting stage, the light-emitting brightness of the light-emitting device can be dynamically adjusted on the premise of not changing the switching voltage of the driving transistor, and the self-adaptive dynamic brightness adjustment is realized, so that the power consumption of a display product can be reduced, and meanwhile, the hysteresis effect caused by changing the switching voltage of the driving transistor is avoided.
Drawings
FIG. 1 is a schematic diagram illustrating a display panel generating a hysteresis effect in the prior art;
FIG. 2 is a flowchart of a pixel driving method according to an embodiment of the present invention;
FIG. 3 is a flow chart of generating a multi-pulse signal according to an embodiment of the present invention;
FIGS. 4 a-4 d are schematic waveforms of pulse signals according to embodiments of the present invention;
fig. 5 is a schematic structural diagram of a pixel circuit according to an embodiment of the invention;
FIG. 6 is a timing diagram illustrating an operation of a pixel circuit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an image processing module according to an embodiment of the present invention.
Detailed Description
The following describes in detail specific embodiments of a pixel driving method and a display panel according to an embodiment of the present invention with reference to the accompanying drawings.
An embodiment of the present invention provides a pixel driving method, as shown in fig. 2, which may include:
s101, in an initialization stage, a switching transistor in a pixel circuit is conducted under the control of a light-emitting signal control end, and a source electrode of a driving transistor is initialized through an initialization signal of a power signal end; the writing transistor is conducted under the control of the scanning signal end, and the grid electrode of the driving transistor is initialized through the initialization signal of the data signal end;
s102, in a compensation stage, the switching transistor is conducted under the control of the light-emitting signal control end, and threshold voltage compensation is carried out on the driving transistor through a power signal of the power signal end;
s103, in a writing stage, the writing transistor is conducted under the control of the scanning signal end, and a data signal of the data signal end is written into the grid electrode of the driving transistor;
s104, in the multi-pulse signal generation stage, converting the pixel signal of the image to be displayed into brightness data, and analyzing and calculating the brightness data to obtain a multi-pulse signal corresponding to the image to be displayed;
s105, in the light-emitting stage, inputting a multi-pulse signal to a light-emitting signal control end; the driving transistor is conducted under the control of a data signal written in the grid electrode; the switch transistor outputs the power supply signal of the power supply signal end to the input end of the light-emitting device through the conducted driving transistor under the control of the multi-pulse signal input by the light-emitting signal control end, and the light-emitting brightness of the light-emitting device is adjusted.
In the pixel driving method provided by the embodiment of the invention, the corresponding multi-pulse signal is generated according to the image data to be displayed, and the multi-pulse signal corresponding to the image data to be displayed is adopted to control the light-emitting device to emit light in the light-emitting stage, so that the light-emitting brightness of the light-emitting device can be dynamically adjusted on the premise of not changing the switching voltage of the driving transistor, and the self-adaptive dynamic brightness adjustment is realized, thereby reducing the power consumption of a display product and avoiding the hysteresis effect brought by changing the switching voltage of the driving transistor.
In practical implementation, in the pixel driving method provided in the embodiment of the present invention, as shown in fig. 3, step S104 may specifically include:
s201, converting each pixel signal of an image to be displayed into brightness data corresponding to each pixel according to a preset lookup table;
s202, summing the brightness data corresponding to each pixel, dividing the sum by the number of total sub-pixels to obtain an average brightness value, and multiplying the average brightness value by the data bit width to obtain a gain value corresponding to the image to be displayed;
s203, determining the multi-pulse signal corresponding to the gain value according to a preset data table corresponding to the gain value and the pulse signal.
Specifically, in the pixel driving method provided in the embodiment of the present invention, in order to achieve adaptive brightness adjustment and thus achieve the purpose of reducing power consumption, a multi-pulse signal corresponding to an image to be displayed needs to be obtained, and then the switching transistor may adjust the brightness of the light emitting device under the control of the multi-pulse signal. Specifically, the conversion of the image to be displayed from RGB to luminance data may be XYZ, Lab, YCbCr or other color spaces, and the luminance is taken as a main parameter. In order to quickly obtain the luminance data corresponding to the image to be displayed, the corresponding relationship between the image data and the luminance data may be stored in the clock controller as a preset lookup table, where the conversion relationship between the image data and the luminance data is described by taking RGB conversion to XYZ color space as an example:
where XYZ is a color space, RGB is sub-pixels, M is a conversion array, and M may be specificallyWherein each parameter can be adjusted according to different conversion color gamuts.
After obtaining the luminance data corresponding to the image to be displayed, analyzing and calculating the luminance data to obtain a corresponding gain value, specifically, summing the luminance data of all pixels of the image to be displayed to obtain total luminance, then calculating the sum of all sub-pixels, dividing the total luminance by the number of the total sub-pixels to obtain average luminance, and multiplying the average luminance by the data bit width to obtain a corresponding gain value; the specific calculation process is as follows:
sum ═ P (0, 0) + P (0, 1) + P (0, 2) + … … + P (m, n); wherein Sum is the total brightness; p (m, n) is the brightness of the pixel point of the nth row and the nth column in the pixel matrix;
ma ═ m × n × β; wherein Ma is the total number of sub-pixels; m and n are the number of rows and columns of the pixel matrix; beta is the number of sub-pixel types, for example, three sub-pixels of RGB or four sub-pixels of RGBW, in practical application, beta may be 2 or 3 in order to reduce power consumption, that is, when the number of sub-pixel types is three, only two sub-pixels may be selected to be lighted, and beta is 2; when the number of the sub-pixel types is four, only three sub-pixels can be selected to be lightened, and beta is 3;
gain (Sum/Ma) × Bits; wherein Gain is a Gain value; bits is data bit width, the data calculation and analysis process needs to be carried out in a digital mode, Bits can be 1023, the larger the data bit width selection is, the more the representative calculation data is, the more accurate the obtained calculation result is, and the undistorted image can be ensured.
And obtaining the gain value corresponding to the image to be displayed so as to determine the corresponding multi-pulse signal. Specifically, the corresponding multi-pulse signal may be obtained through a corresponding data table in which the preset gain value corresponds to the pulse signal, where the corresponding data table may include: a plurality of preset gain value intervals and a plurality of pulse waveforms; each preset gain value interval corresponds to a pulse waveform. The number of pulses and the pulse width used are determined by different gain value intervals, and a specific corresponding data table can be shown in the following table 1; for example, when the image is a white image with full-screen high brightness, the finally obtained multi-pulse signal is a pulse driving waveform with the maximum width of a single pulse, and as the image brightness decreases, the number and the width of the pulses can be determined according to the obtained gain value, and then the data is transmitted to the driving chip to obtain the corresponding driving waveform. Therefore, the brightness of the light-emitting device can be adjusted on the premise of not changing the switching voltage of the driving transistor.
TABLE 1
| Gain(L) | 0～255 | 256～511 | 512～767 | 768～1023 |
| Multiple pulse signal | 3 segment pulse/pulsewidth 4 | 2-segment pulse/pulsewidth 3 | 2-segment pulse/pulsewidth 2 | Single pulse/pulse width 1 |
The pulse width of each multi-pulse signal is as shown in fig. 4a to 4d, the pulse width 1> the pulse width 2> the pulse width 3> the pulse width 4, the specific pulse width may be set according to actual needs, and the size and number of the gain value intervals and the corresponding pulse types may also be set according to actual needs, so that various pulse driving waveforms may be flexibly applied, which is not limited herein.
Based on the same inventive concept, an embodiment of the present invention provides a display panel, as shown in fig. 5, including: a pixel circuit having a driving transistor T1, a switching transistor T2, a writing transistor T3, and a light emitting device OLED, and an image processing module; wherein,
the source electrode of the switch transistor T2 is connected with a power supply signal end VDD, the grid electrode is connected with a light-emitting signal control end EM, and the drain electrode is connected with the source electrode of the driving transistor T1;
the gate of the driving transistor T1 is connected to the drain of the writing transistor T3, and the drain is connected to the input terminal of the light emitting device OLED;
the gate of the writing transistor T3 is connected to the Scan signal terminal Scan, and the source is connected to the Data signal terminal Data;
in the initialization stage, the switching transistor T2 is turned on under the control of the emission signal control terminal EM, and the source of the driving transistor T1 is initialized by the initialization signal of the power signal terminal VDD; the write transistor T3 is turned on under the control of the Scan signal terminal Scan, and initializes the gate of the drive transistor T1 by the initialization signal of the Data signal terminal Data;
in the compensation stage, the switching transistor T2 is turned on under the control of the emission signal control terminal EM, and the threshold voltage compensation is performed on the driving transistor T1 by the power signal of the power signal terminal VDD;
in the writing phase, the writing transistor T3 is turned on under the control of the Scan signal terminal Scan, and the Data signal of the Data signal terminal Data is written to the gate of the driving transistor T1;
in the multi-pulse signal generation stage, the image processing module converts the pixel signals of the image to be displayed into brightness data, and analyzes and calculates the brightness data to obtain multi-pulse signals corresponding to the image to be displayed;
in the light-emitting stage, a multi-pulse signal is input to a light-emitting signal control end EM; the driving transistor T1 is turned on under the control of the data signal written at the gate; the switching transistor T2 outputs the signal of the power signal terminal VDD to the input terminal of the light emitting device OLED through the turned-on driving transistor T1 under the control of the multi-pulse signal inputted from the light emitting signal control terminal EM, and adjusts the light emitting luminance of the light emitting device OLED.
In the above display panel provided by the embodiment of the present invention, as shown in fig. 5 (fig. 5 only shows a specific structure of the pixel circuit), the pixel circuit includes a driving transistor T1, a switching transistor T2, a writing transistor T3, and a light emitting device OLED; further comprising: a first capacitor C1 and a second capacitor C2; the first capacitor C1 is connected between the gate and the drain of the driving transistor T1; the second capacitor C2 is connected between the input terminal and the output terminal of the light emitting device. The pixel circuit of 3T2C can drive the light emitting device to emit light normally, and the corresponding operation timing diagram of the pixel circuit is shown in fig. 6.
Specifically, it should be noted that the Transistor mentioned in the above embodiments of the present invention may be a Thin Film Transistor (TFT) or a Metal oxide semiconductor field effect Transistor (MOS), and is not limited herein. In specific implementations, the sources and drains of these transistors may be interchanged without specific distinction. A thin film transistor will be described as an example in describing specific embodiments.
The following describes the operation of the pixel circuit provided by the embodiment of the present invention with reference to the pixel circuit shown in fig. 5 and the input/output timing diagram shown in fig. 6, where the transistors in the pixel circuit are illustrated as N-type transistors. Specifically, five stages t1 to t5 in the input-output timing diagram shown in fig. 6 are selected. In the following description, a high level signal is denoted by 1, and a low level signal is denoted by 0.
In stage t1, VDD is 0, EM is 1, Scan is 1, and Data is 0. Since EM is 1 and Scan is 1, the switching transistor T2 and the writing transistor T3 are turned on; the turned-on switching transistor T2 outputs the initialization signal 0 of the power supply signal terminal VDD to the source of the driving transistor T1, so as to initialize, i.e., reset, the source of the driving transistor T1; the turned-on write transistor T3 outputs the initialization signal 0 of the Data signal terminal Data to the gate of the drive transistor T1, thereby initializing, i.e., resetting, the gate of the drive transistor T1. the stage t1 is an initialization stage.
In stage t2, VDD is 1, EM is 1, Scan is 0, and Data is 0. Since EM is 1, the switching transistor T2 is turned on; the turned-on switching transistor T2 outputs the power signal of the power signal terminal VDD to the source of the driving transistor T1, and the gate and the drain of the driving transistor T1 are connected through the first capacitor C1, so that compensation for the threshold voltage of the driving transistor T1 can be achieved through the charging and discharging actions of the first capacitor C1. the stage t2 is a compensation stage.
In stage t3, VDD is 1, EM is 0, Scan is 1, and Data is 1. Since Scan is 1, the write transistor T3 is turned on; the turned-on write transistor T3 outputs the Data signal at the Data signal terminal Data to the gate of the drive transistor T1, thereby writing the Data signal. the stage t3 is a write stage.
In stage t4, VDD is 1, EM is 0, Scan is 0, and Data is 0. In the stage, pixel signals of an image to be displayed are converted into brightness data through the image processing module, and the brightness data are analyzed and calculated to obtain a multi-pulse signal corresponding to the image to be displayed. the stage t4 is a multi-pulse signal generation stage.
At stage t5, VDD is 1, EM is the multi-pulse signal, Scan is 0, and Data is 0. Inputting a multi-pulse signal to a light-emitting signal control end EM; the driving transistor T1 is turned on under the control of the data signal written at the gate; the switching transistor T2 outputs the power signal of the power signal terminal VDD to the input terminal of the light emitting device OLED through the turned-on driving transistor T1 under the control of the multi-pulse signal inputted from the light emitting signal control terminal EM, and adjusts the light emitting luminance of the light emitting device OLED. the t5 phase is a light emitting phase.
Through the working process, the corresponding multi-pulse signals are generated according to the image data to be displayed, the multi-pulse signals corresponding to the image data to be displayed are adopted to control the light-emitting device to emit light in the light-emitting stage, the light-emitting brightness of the light-emitting device can be dynamically adjusted on the premise of not changing the switching voltage of the driving transistor, self-adaptive dynamic brightness adjustment is realized, the power consumption of a display product can be reduced, and meanwhile the hysteresis effect caused by changing the switching voltage of the driving transistor is avoided. It should be noted that the pixel circuit structure of 3T2C is a relatively simple pixel circuit structure, and other pixel circuit structures including a driving transistor and a switching transistor are also applicable to the pixel driving method provided in the embodiment of the present invention.
In a specific implementation, as shown in fig. 7, in the display panel provided in the embodiment of the present invention, the image processing module may include: the device comprises a conversion module 01, a calculation module 02 and a determination module 03; the conversion module 01 is configured to convert each pixel signal of an image to be displayed into luminance data corresponding to each pixel according to a preset lookup table; the calculating module 02 is configured to sum the luminance data corresponding to each pixel, divide the sum by the number of total sub-pixels to obtain an average luminance value, and multiply the average luminance value by a data bit width to obtain a gain value corresponding to the image to be displayed; the determining module 03 is configured to determine the multi-pulse signal corresponding to the gain value according to a preset data table of the gain value and the pulse signal.
In a specific implementation, in the display panel provided in the embodiment of the present invention, the conversion module converts, according to a preset lookup table of a conversion relationship corresponding to pre-stored image data and luminance data, the image data of an image to be displayed, that is, each pixel signal into the luminance data, where the conversion relationship between each pixel signal and the luminance data in the preset lookup table can be represented by the following conversion formula:where XYZ is a color space, RGB is sub-pixels, and M is a conversion array. The specific conversion relationship is as described above, and the repeated parts are not described in detail.
In a specific implementation, in the display panel provided in the embodiment of the present invention, after obtaining a gain value corresponding to an image to be displayed, a corresponding data table of preset gain values and pulse signals may be used to obtain a corresponding multi-pulse signal, where the corresponding data table may include: a plurality of preset gain value intervals and a plurality of pulse waveforms; each preset gain value interval corresponds to a pulse waveform. The specific process of determining the pulse signal is as described above, and the repetition is not repeated.
The embodiment of the invention provides a pixel driving method and a display panel, wherein the pixel driving method comprises the following steps: initializing a source and a drain of the driving transistor in an initialization stage; performing threshold voltage compensation on the driving transistor in a compensation stage; writing a data signal of the data signal terminal into the gate of the driving transistor in a writing stage; converting pixel signals of an image to be displayed into brightness data in a multi-pulse signal generation stage, and analyzing and calculating the brightness data to obtain multi-pulse signals corresponding to the image to be displayed; inputting a multi-pulse signal to a light-emitting signal control terminal in a light-emitting stage; the driving transistor is conducted under the control of a data signal written in the grid electrode; the switch transistor outputs the power supply signal of the power supply signal end to the input end of the light-emitting device through the conducted driving transistor under the control of the multi-pulse signal input by the light-emitting signal control end, and the light-emitting brightness of the light-emitting device is adjusted. Therefore, the corresponding multi-pulse signals are generated according to the image data to be displayed, the multi-pulse signals corresponding to the image data to be displayed are adopted to control the light-emitting device to emit light in the light-emitting stage, the light-emitting brightness of the light-emitting device can be dynamically adjusted on the premise of not changing the switching voltage of the driving transistor, and the self-adaptive dynamic brightness adjustment is realized, so that the power consumption of a display product can be reduced, and meanwhile, the hysteresis effect caused by changing the switching voltage of the driving transistor is avoided.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A pixel driving method, comprising:
in the initialization stage, a switching transistor in the pixel circuit is conducted under the control of a light-emitting signal control end, and a source electrode of a driving transistor is initialized through an initialization signal of a power signal end; the writing transistor is conducted under the control of the scanning signal end, and the grid electrode of the driving transistor is initialized through the initialization signal of the data signal end;
in the compensation stage, the switch transistor is conducted under the control of the light-emitting signal control end, and the threshold voltage compensation is carried out on the driving transistor through a power supply signal of the power supply signal end;
in a writing stage, the writing transistor is conducted under the control of the scanning signal end, and a data signal of the data signal end is written into the grid electrode of the driving transistor;
it is characterized by also comprising:
in a multi-pulse signal generation stage, converting the pixel signal of the image to be displayed into brightness data, and analyzing and calculating the brightness data to obtain a multi-pulse signal corresponding to the image to be displayed;
in the light-emitting stage, inputting the multi-pulse signal to the light-emitting signal control end; the driving transistor is conducted under the control of the data signal written in the grid electrode; the switch transistor outputs a power supply signal of the power supply signal end to the input end of the light-emitting device through the conducted driving transistor under the control of a multi-pulse signal input by the light-emitting signal control end, and the light-emitting brightness of the light-emitting device is adjusted.
2. The pixel driving method according to claim 1, wherein converting the pixel signal of the image to be displayed into luminance data, and analyzing and calculating the luminance data to obtain a multi-pulse signal corresponding to the image to be displayed specifically comprises:
converting each pixel signal of the image to be displayed into brightness data corresponding to each pixel according to a preset lookup table;
summing the brightness data corresponding to each pixel, dividing the sum by the number of total sub-pixels to obtain an average brightness value, and multiplying the average brightness value by a data bit width to obtain a gain value corresponding to the image to be displayed;
and determining the multi-pulse signal corresponding to the gain value according to a preset data table of the gain value and the pulse signal.
3. The pixel driving method according to claim 2, wherein the conversion relationship between each pixel signal and the luminance data in the preset lookup table can be expressed by the following conversion formula:
where XYZ is a color space, RGB is sub-pixels, and M is a conversion array.
4. The pixel driving method according to claim 2, wherein the correspondence data table includes: a plurality of preset gain value intervals and a plurality of pulse waveforms;
each preset gain value interval corresponds to one pulse mode.
5. A display panel, comprising: a pixel circuit having a driving transistor, a switching transistor, a writing transistor, and a light emitting device, and an image processing module; wherein,
the source electrode of the switch transistor is connected with the power signal end, the grid electrode of the switch transistor is connected with the light-emitting signal control end, and the drain electrode of the switch transistor is connected with the source electrode of the driving transistor; the grid electrode of the driving transistor is connected with the drain electrode of the writing transistor, and the drain electrode is connected with the input end of the light-emitting device; the grid electrode of the writing transistor is connected with a scanning signal end, and the source electrode of the writing transistor is connected with the data signal end;
in an initialization stage, the switch transistor is switched on under the control of the light-emitting signal control end, and the source electrode of the driving transistor is initialized through an initialization signal of the power signal end; the writing transistor is conducted under the control of the scanning signal end, and the grid electrode of the driving transistor is initialized through the initialization signal of the data signal end;
in the compensation stage, the switch transistor is conducted under the control of the light-emitting signal control end, and the threshold voltage compensation is carried out on the driving transistor through a power supply signal of the power supply signal end;
in a writing stage, the writing transistor is conducted under the control of the scanning signal end, and a data signal of the data signal end is written into the grid electrode of the driving transistor;
in a multi-pulse signal generation stage, an image processing module converts pixel signals of the image to be displayed into brightness data, and analyzes and calculates the brightness data to obtain multi-pulse signals corresponding to the image to be displayed;
in the light-emitting stage, inputting the multi-pulse signal to the light-emitting signal control end; the driving transistor is conducted under the control of the data signal written in the grid electrode; the switch transistor outputs a power supply signal of the power supply signal end to the input end of the light-emitting device through the conducted driving transistor under the control of a multi-pulse signal input by the light-emitting signal control end, and the light-emitting brightness of the light-emitting device is adjusted.
6. The display panel of claim 5, wherein the image processing module comprises: the device comprises a conversion module, a calculation module and a determination module; wherein,
the conversion module is used for converting each pixel signal of the image to be displayed into brightness data corresponding to each pixel according to a preset lookup table;
the calculation module is used for summing the brightness data corresponding to each pixel, dividing the sum by the number of total sub-pixels to obtain an average brightness value, and multiplying the average brightness value by a data bit width to obtain a gain value corresponding to the image to be displayed;
the determining module is used for determining the multi-pulse signal corresponding to the gain value according to a preset data table corresponding to the gain value and the pulse signal.
7. The display panel according to claim 6, wherein the conversion relationship between each pixel signal and the luminance data in the preset lookup table can be expressed by the following conversion formula:
where XYZ is a color space, RGB is sub-pixels, and M is a conversion array.
8. The display panel of claim 6, wherein the correspondence data table comprises: a plurality of preset gain value intervals and a plurality of pulse waveforms;
each preset gain value interval corresponds to one pulse mode.
9. The display panel of claims 5-8, wherein the pixel circuit further comprises: a first capacitor and a second capacitor; wherein,
the first capacitor is connected between the grid electrode and the drain electrode of the driving transistor;
the second capacitor is connected between the input end and the output end of the light-emitting device.
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