CN113658551B - Pixel circuit driving method, pixel driving device and display device - Google Patents
Pixel circuit driving method, pixel driving device and display device Download PDFInfo
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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]
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- G09G2320/00—Control of display operating conditions
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Abstract
The application discloses a pixel circuit driving method, a pixel driving device and a display device. The pixel circuit driving method includes: acquiring the number of gray scales to be displayed of a pixel circuit; determining a target driving strategy of the number of the gray scales to be displayed according to a mapping relation between a preset driving strategy and the number of the displayed gray scales and the number of the gray scales to be displayed; driving the pixel circuit according to the target drive strategy. The embodiment of the application is provided with a mapping relation between the driving strategy and the number of the displayed gray scales, then different target driving strategies are determined based on the number of the to-be-displayed gray scales of different pixel circuits, the light emitting elements of the pixel circuits are driven to emit light, and color cast in a low-gray-scale state by adopting single PAM driving is avoided.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a pixel circuit driving method, a pixel driving device, and a display device.
Background
An Organic Light Emitting Diode (OLED) display device has many advantages of self-luminescence, low driving voltage, high light Emitting efficiency, short response time, and wide temperature range. Are recognized as the most promising display devices. The gray levels represent gradation levels of different brightness from the darkest to the brightest. At present, a driving method of a pixel circuit is PAM (Pulse Amplitude Modulation), but in a low-gray-scale state, a current for driving an LED is small, so that an LED light-emitting wavelength is unstable, and color shift occurs.
Disclosure of Invention
The embodiment of the application provides a pixel circuit driving method, a pixel driving device and a display device, which are provided with a mapping relation between a driving strategy and the number of displayed gray scales, then different target driving strategies are determined based on the number of the to-be-displayed gray scales of different pixel circuits, and a light emitting element of the pixel circuit is driven to emit light, so that color cast in a low-gray-scale state by adopting single PAM (pulse amplitude modulation) driving is avoided.
The embodiment of the application provides a pixel circuit driving method, which comprises the following steps:
acquiring the number of gray scales to be displayed of a pixel circuit;
determining a target driving strategy of the number of the gray scales to be displayed according to a mapping relation between a preset driving strategy and the number of the displayed gray scales and the number of the gray scales to be displayed;
driving the pixel circuit according to the target drive strategy.
In some embodiments, the determining the target driving strategy of the number of the to-be-displayed gray scales according to a mapping relationship between a preset driving strategy and the number of the displayed gray scales and the number of the to-be-displayed gray scales includes:
when the number of the gray scales to be displayed is larger than or equal to a critical gray scale number, determining that a first driving strategy is the target driving strategy according to the mapping relation and the number of the gray scales to be displayed, wherein the critical gray scale number is the number of the gray scales at the critical position where the first driving strategy and a second driving strategy are switched in the mapping relation;
and when the number of the gray scales to be displayed is less than the critical number of the gray scales, determining a second driving strategy as the target driving strategy according to the mapping relation and the number of the gray scales to be displayed.
In some embodiments, the first drive strategy is a pulse amplitude modulation strategy, said driving the pixel circuit according to the target drive strategy comprising:
and modulating the pulse amplitude of the pixel circuit according to the pulse amplitude modulation strategy so as to adjust the luminous intensity of the pixel circuit by controlling the current magnitude of the pixel circuit.
In some embodiments, the second drive strategy is a pulse width modulation strategy, said driving the pixel circuit according to the target drive strategy comprising:
and modulating the pulse width of the pixel circuit according to the pulse width modulation strategy so as to adjust the luminous intensity of the pixel circuit by controlling the luminous time of the pixel circuit.
In some embodiments, the number of critical gray levels is 2 n The pixel circuit is an m-bit gray scale pixel circuit, m is greater than n, and m and n are positive integersThe pixel circuit comprises a first driving strategy and a second driving strategy, wherein each display period of the pixel circuit comprises s +1 sub-fields, s is not less than n and is a positive integer, the first driving strategy is a driving strategy of one sub-field, and the second driving strategy is a driving strategy of s sub-fields except the sub-field of the first driving strategy.
In some embodiments, the determining a first driving strategy as the target driving strategy according to the mapping relationship and the number of the to-be-displayed gray scales when the number of the to-be-displayed gray scales is greater than or equal to a critical gray scale number includes:
when the number of the gray scales to be displayed is more than or equal to the number of the critical gray scales, determining a first driving mode according to the mapping relation;
determining the data voltage value of the pixel circuit according to the number of the gray scales to be displayed;
obtaining the first driving strategy according to the first driving mode and the data voltage value;
driving the pixel circuit according to the target drive strategy, comprising:
and controlling one subfield corresponding to the first driving strategy to emit light according to the first driving strategy and the data voltage value.
In some embodiments, the light emitting ratio of the s subfields corresponding to the second driving strategy is: 1:2 a :2 b …2 s-1 ，s≥2，1+2 a +2 b +…+2 s-1 ≥2 n -1, a, b are any positive integer; when the number of the gray scales to be displayed is t, any one or more sub-fields in the s sub-fields emit light, and t is more than or equal to 1 and less than 2 n T is any positive integer;
when the number of the gray scales to be displayed is less than the critical number of the gray scales, determining a second driving strategy as the target driving strategy according to the mapping relation and the number of the gray scales to be displayed, wherein the method comprises the following steps:
when the number of the gray scales to be displayed is less than the critical number of the gray scales, determining a second driving mode according to the mapping relation;
determining a target luminous sub-field in the s sub-fields according to the number of the gray scales to be displayed;
obtaining the second driving strategy according to the second driving mode and the target light-emitting sub-field;
driving the pixel circuit according to the target drive strategy;
and controlling the target light-emitting sub-field to emit light according to the second driving mode.
In some embodiments, before the obtaining the number of gray scales to be displayed of the pixel circuit, the method further comprises:
acquiring a driving adjustment instruction, wherein the driving adjustment instruction comprises a mapping relation between a driving strategy and the number of displayed gray scales and/or the number of critical gray scales;
and updating according to the driving regulation instruction to obtain a new mapping relation and the critical gray scale number.
An embodiment of the present application provides a pixel driving device, including:
one or more processors;
a memory; and one or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the processor to implement the pixel circuit driving method.
The embodiment of the present application provides a display device, which includes the pixel driving device as described above.
An embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored, where the computer program is loaded by a processor to execute the steps in the pixel circuit driving method.
Embodiments of the present application provide a computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the pixel circuit driving method described above.
The pixel circuit driving method, the pixel driving device and the display device provided by the embodiment of the application are provided with the mapping relation between the driving strategy and the number of the displayed gray scales, then different target driving strategies are determined based on the number of the to-be-displayed gray scales of different pixel circuits, and the light emitting element of the pixel circuit is driven to emit light, so that the problem that color cast occurs in a low-gray-scale state by adopting single PAM driving or brightness loss occurs when high-gray scales are driven by single PWM is avoided.
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The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of a pixel circuit driving method according to an embodiment of the present disclosure.
Fig. 2 is a schematic structural diagram of a 4T1C pixel circuit according to an embodiment of the present disclosure.
Fig. 3 is a schematic flowchart of a pixel circuit driven based on a first driving strategy according to an embodiment of the present disclosure.
Fig. 4 is a schematic flowchart of driving a pixel circuit based on a second driving strategy according to an embodiment of the present disclosure.
Fig. 5 is a schematic structural diagram of sub-field division of a driving region with a critical gray scale number of 32 gray scales according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the application. To simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
Aiming at the prior art, if the pixel circuit adopts a Pulse Amplitude Modulation (PAM) driving mode, the current for driving the LED is small under a low-gray-scale state, so that the luminous wavelength of the LED is unstable and color cast occurs. If the pixel circuit adopts PWM (Pulse Width Modulation), wherein the visual characteristics of human eyes are that the subjective feeling brightness and the luminous duty ratio are in direct proportion, the subjective feeling brightness is controlled by keeping the current constant and turning on and off the luminous device to adjust the on-time of the current, the current is kept constant, and the LED works in the LED luminous stable area, the color point is stable, but the subjective feeling brightness is controlled by controlling the luminous time, and the brightness loss is generated in high gray scale. Therefore, the present invention provides a driving method for a pixel circuit to solve the above-mentioned problems of using PAM driving or PWM driving alone.
Referring to fig. 1, an embodiment of the present invention provides a pixel circuit driving method, including:
s1, acquiring the number of gray scales to be displayed of a pixel circuit;
s2, determining a target driving strategy of the number of the gray scales to be displayed according to a mapping relation between a preset driving strategy and the number of the displayed gray scales and the number of the gray scales to be displayed;
and S3, driving the pixel circuit according to the target driving strategy.
Specifically, the present embodiment is applied to a pixel circuit, but the architecture of the pixel circuit is not particularly limited. For example, it can be applied to a 4T1C pixel circuit as shown in fig. 2, the 4T1C pixel circuit including a driving transistor T2, a first transistor T1, a second transistor T3, a third transistor T4, a storage capacitor Cst, and a light emitting element. A control end of the driving transistor T2 is connected to the second end of the first transistor T1 and the second end of the third transistor T4, a first end of the driving transistor DT is connected to the first end of the second transistor T3, and a second end of the driving transistor DT is connected to the first power supply signal VDD; a control end of the first transistor T1 is connected with a scanning signal Scan, and a first end of the first transistor T1 is connected with the data line data; the control end of the second transistor T3 is connected with a sensing line Sense; a first end of the third transistor T4 is connected to the second power signal Vneg; a first end of the storage capacitor Cst is connected to the control end of the driving transistor DT, and a second end of the storage capacitor Cst is connected to a first end of the second transistor T3; the anode terminal of the light emitting element is connected with the first terminal of the driving transistor DT, and the cathode terminal of the light emitting element is connected with the third power supply signal OVSS; a first end of the sensing line sense is connected to the initial voltage signal Vini and the external compensation unit, and a second end of the sensing line sense is connected to a second end of the second transistor T2. When the control terminal of the third transistor T4 is connected to PWM, T1 is turned on first, data is charged into the storage capacitor Cst, vg increases to turn on T2, and the light emitting element emits light. Then, T1 is turned off, and the light emitting element continues to emit light because the stored charges are present in Cst and the voltage Vg is unchanged. Finally, the PWM signal turns on T4, vneg charges to Vg, T2 is turned off, and the light-emitting element does not emit light, namely PWM driving is realized. The pixel circuit shown in fig. 2 is merely an illustration of one of the circuit architectures, and should not be construed as a limitation of the present invention.
In addition, the present embodiment is applied to a controller of a driving method of a pixel circuit, for example, a control chip. When the light emitting element in the pixel circuit needs to be controlled to emit light, the number of gray scales to be displayed of the pixel circuit is acquired first. The gray scales represent the gradation levels with different brightness from the darkest to the brightest, the number of gray scales that can be displayed by the pixel circuits with different bits is different, for example, the pixel circuit with 8bits is divided into 2^8=256 gray scales from the darkest to the brightest for display, and the number of gray scales to be displayed is the number of gray scales corresponding to the light emitting degree of the light emitting element in the pixel circuit.
Different driving strategies are adopted for different numbers of gray scales to be displayed respectively, so that the problem of adopting single PAM driving or PWM driving is solved. Therefore, the mapping relation between the driving strategy and the number of the displayed gray scales is preset, and the target driving strategy of the number of the gray scales to be displayed can be determined by combining the number of the gray scales to be displayed.
The number of each displayed gray scale in the mapping relation between the driving strategy and the number of the displayed gray scales corresponds to different driving strategies respectively, so that a refined control strategy is achieved, the whole gray scale range of the pixel circuit can be divided into different areas, each area corresponds to different driving strategies, and the control strategies are simplified on the premise of ensuring the driving display effect.
And finally, driving the pixel circuit according to the determined target driving strategy to enable the light-emitting element in the pixel circuit to emit light.
In this embodiment, a corresponding target driving strategy is determined according to the number of the to-be-displayed gray scales, and different numbers of the to-be-displayed gray scales correspond to different driving strategies to drive the pixel circuit, so that the problem that a single PAM drive is adopted to generate color cast in a low-gray-scale state or a single PWM drive is adopted to generate brightness loss in a high-gray-scale state is avoided. In addition, the embodiment is suitable for pixel circuits with various architectures, and has the advantages of simple implementation mode and wide application range.
In some embodiments of the present application, the step S2 of determining the target driving strategy of the number of to-be-displayed gray scales according to a mapping relationship between a preset driving strategy and the number of displayed gray scales and the number of to-be-displayed gray scales includes:
s21, when the number of the gray scales to be displayed is larger than or equal to a critical gray scale number, determining a first driving strategy as the target driving strategy according to the mapping relation and the number of the gray scales to be displayed, wherein the critical gray scale number is the number of the gray scales at the critical position where the first driving strategy and the second driving strategy are switched in the mapping relation;
and S22, when the number of the gray scales to be displayed is less than the critical number of the gray scales, determining a second driving strategy as the target driving strategy according to the mapping relation and the number of the gray scales to be displayed.
The whole gray scale range of the pixel circuit is divided into two parts by taking the critical gray scale number as a boundary point, and the two parts respectively adopt different driving strategies. And when the number of the gray scales to be displayed is more than or equal to the critical gray scale number, determining a first driving strategy as a target driving strategy according to the mapping relation and the number of the gray scales to be displayed. And when the number of the gray scales to be displayed is less than the critical number of the gray scales, determining the second driving strategy as the target driving strategy according to the mapping relation and the number of the gray scales to be displayed.
The critical gray scale number is the gray scale number at the critical position where the first driving strategy and the second driving strategy are switched in the mapping relation, for example, for a pixel circuit with 8bits, 32 gray scales are set as the critical gray scale number, when the number of the gray scales to be displayed is greater than or equal to 32, the first driving strategy is adopted, and when the number of the gray scales to be displayed is less than 32, the second driving strategy is adopted. The number of the critical gray levels can be freely set according to different design requirements, and is not particularly limited herein.
In some embodiments of the present application, the first driving strategy is a pulse amplitude modulation strategy, and the step S3 of driving the pixel circuit according to the target driving strategy includes:
and S31, modulating the pulse amplitude of the pixel circuit according to the pulse amplitude modulation strategy so as to adjust the luminous intensity of the pixel circuit by controlling the current magnitude of the pixel circuit.
Among them, color shift occurs in a low gray state due to PAM driving, but PAM driving is not significantly insufficient in a high gray state. Therefore, the first driving strategy is pulse amplitude modulation, PAM driving is adopted when the number of the pixel circuits is higher than the critical gray scale number, the pulse amplitude of the pixel circuits is modulated, the current magnitude is changed, the luminous intensity of the pixel circuits is adjusted, the subjective brightness is controlled, and the brightness loss is avoided.
In some embodiments of the present application, the second driving strategy is a pulse width modulation strategy, and the step S3 of driving the pixel circuit according to the target driving strategy includes:
and S32, modulating the pulse width of the pixel circuit according to the pulse width modulation strategy so as to adjust the luminous intensity of the pixel circuit by controlling the luminous time of the pixel circuit.
In this case, the high gray scale causes a loss of brightness due to the PWM driving, but the PWM driving is not significantly insufficient in the low gray scale state. Therefore, the second driving strategy is pulse width modulation, which adopts PWM driving when the number of the gray levels is lower than the critical number, and modulates the pulse width of the pixel circuit to adjust the light emitting intensity of the pixel circuit by controlling the light emitting time of the pixel circuit. Human eye vision characteristics show that the subjective brightness and the luminous duty ratio are in direct proportion, so that the subjective brightness is controlled by keeping the current constant and turning on and off the luminous element to adjust the on-time of the current. The constant current is kept, the LED works in a light-emitting stable area of the light-emitting element, and the color point is stable.
And PWM driving is adopted when the number of the gray scales is lower than the critical number of the gray scales, and PAM driving is adopted when the number of the gray scales is higher than the critical number of the gray scales, namely, a mode of PWM and PAM mixed driving is adopted, so that the problem of single PAM driving or PWM driving is avoided.
In addition, in order to solve the problem of color shift in the low gray level state caused by PAM driving, the critical gray level number may be set to a gray level number in which the light emitting wavelength of the light emitting element in the pixel circuit is unstable, for example, in a pixel circuit of 8bits, the Data voltage required for 32 gray levels or less is low, the Ids current is small, and the light emitting wavelength of the light emitting element is unstable, so 32 gray levels are set as the critical gray level number. In an actual driving process, due to factors such as device parameters, the critical gray scale numbers of the pixel circuits with the same structure may be different, and therefore the critical gray scale numbers may be freely set according to different design requirements, which is not specifically limited herein.
In some embodiments of the present application, the number of critical gray levels is 2 n The pixel circuit is an m-bit gray scale pixel circuit, m is greater than n, both m and n are positive integers, each display period of the pixel circuit comprises s +1 sub-fields, s is greater than or equal to n, s is a positive integer, and the first driving strategyThe second driving strategy is a driving strategy of s subfields except for the subfield of the first driving strategy.
Wherein, for a pixel circuit with m bit gray scale, the pixel circuit is divided into 2 from darkest to brightest m The gray scales, for example, the pixel circuits of 8bits are divided into 2^8=256 gray scales from the darkest to the brightest for display. And since the light emitting ratio of the sub-fields in the PWM driving is sequentially divided by a factorial of 2, the critical number of gray scales is set to 2 n And not 3, 5, etc. Wherein m is larger than n, and m and n are positive integers.
In addition, in order to realize the scheme of low-gray-scale PWM + high-gray-scale PAM hybrid driving, a frame is divided into s +1 sub-fields, that is, each display period of the pixel circuit includes s +1 sub-fields, and s is a positive integer.
The first driving strategy is a driving strategy of one subfield, that is, the first driving strategy emits light only through the one subfield. The second driving strategy is a driving strategy of s subfields other than the subfields of the first driving strategy, i.e., the first driving strategy controls any one or more subfields of the s subfields to emit light.
In addition, the number of critical gray levels is set to 2 n In order to ensure that each gray scale number in the first driving strategy can be displayed without omission, the number of the corresponding sub-fields in the first driving strategy is at least n, so that s is more than or equal to n. For example, 32 (2) 5 ) Critical number of gray levels as an example, a PWM-driven area is described, wherein the PWM-driven area is divided into at least 5 sub-fields, and the light emitting ratio of each sub-field is 1 1 :2 2 :2 3 :2 4 Wherein, the luminous intensity corresponding to the subfield with the minimum luminous proportion is 1 gray scale. If gray scale of 5 is to be realized, sub-fields 1 and 2 2 Emitting light; to realize 31 gray levels, all subfields emit light. On one hand, if the light emission intensity corresponding to the subfield with the minimum light emission ratio is greater than 1 gray scale, the light emission with 1 gray scale cannot be realized, and thus the light emission intensity corresponding to the subfield with the minimum light emission ratio should not be greater than 1 gray scale. On the other hand, if the PWM-driven area division sub-fieldIf the number is too small, the combination of the luminous intensities corresponding to the plurality of subfields cannot completely emit the gray scales below the critical gray scale number, so that the number of subfields divided in the PWM driving area is not less than the factorial number of the critical gray scale number.
In some embodiments of the present application, as shown in fig. 3, in the step S21, when the number of the to-be-displayed gray scales is greater than or equal to a critical gray scale number, determining a first driving strategy as the target driving strategy according to the mapping relationship and the number of the to-be-displayed gray scales includes:
s211, when the number of the gray scales to be displayed is more than or equal to the number of the critical gray scales, determining a first driving mode according to the mapping relation;
s212, determining the data voltage value of the pixel circuit according to the number of the gray scales to be displayed;
s213, obtaining the first driving strategy according to the first driving mode and the data voltage value;
s3, driving the pixel circuit according to the target driving strategy, comprising:
and S33, controlling one sub-field corresponding to the first driving strategy to emit light according to the first driving mode and the data voltage value.
Specifically, for different driving strategies, the driving modes, such as PWM driving and PAM driving, are determined first, and further, even for the same driving mode, the specific parameters in the driving process may be different based on different numbers of gray scales to be displayed.
And when the number of the gray scales to be displayed is more than or equal to the critical number of the gray scales, determining a first driving mode according to the mapping relation, for example, determining the first driving mode as PAM driving. In addition, since the unique corresponding subfield is controlled to emit light when PAM is driven, the luminance thereof is controlled by a voltage. Therefore, the data voltage value of the pixel circuit is determined according to the number of the gray scales to be displayed, and the first driving strategy is obtained by combining the first driving mode and the data voltage value. And controlling one sub-field corresponding to the first driving strategy to emit light according to the first driving mode and the data voltage value, namely adjusting the voltage to the determined data voltage value according to the PAM driving mode so as to realize the display of the corresponding gray scale.
In some embodiments of the present application, the light emitting ratio of the s subfields corresponding to the second driving strategy is: 1:2 a :2 b …2 s-1 ，s≥2，1+2 a +2 b +…+2 s-1 ≥2 n -1, a, b are any positive integer; when the number of the gray scales to be displayed is t, any one or more sub-fields in the s sub-fields emit light, and t is more than or equal to 1 and less than 2 n T is any positive integer;
as shown in fig. 4, in the step S22, when the number of the to-be-displayed gray scales is smaller than the critical gray scale number, determining a second driving strategy as the target driving strategy according to the mapping relationship and the number of the to-be-displayed gray scales includes:
s221, when the number of the gray scales to be displayed is smaller than the number of the critical gray scales, determining a second driving mode according to the mapping relation;
s222, determining a target light-emitting sub-field in the S sub-fields according to the number of the gray scales to be displayed;
s223, obtaining the second driving strategy according to the second driving mode and the target light-emitting sub-field;
s3, driving the pixel circuit according to the target driving strategy;
and S34, controlling the target light-emitting sub-field to emit light according to the second driving mode.
Specifically, for different driving strategies, the driving modes, such as PWM driving and PAM driving, are determined first, and further, even for the same driving mode, the specific parameters in the driving process may be different based on the number of gray scales to be displayed.
And when the number of the gray scales to be displayed is less than the critical number of the gray scales, determining a second driving mode according to the mapping relation, for example, determining the second driving mode as PWM driving. In addition, any one or more sub-fields in the s sub-fields are controlled to emit light during PWM driving so as to achieve the number of gray scales to be displayed.
The light emitting proportion of s subfields corresponding to the second driving strategy is as follows: 1:2 a :2 b …2 s-1 S.gtoreq.2, a, b is any positive integer, that is to say eachThe luminous proportion of the sub-fields is any factorial of 2, and the proportion of the sub-fields is not required to be set. In addition, 1+2 a +2 b +…+2 s-1 ≥2 n -1, that is, the sub-field division of the area set for PWM driving has a light emitting ratio number greater than the maximum number of gray scales required for PWM driving display, that is, a number of gray scales one less than the critical number of gray scales. The combination of the emission intensities corresponding to the plurality of subfields in the PWM driving region is required to display all gray levels equal to or lower than the critical gray level number.
In view of the arbitrary factorial requirement that the light emitting proportion fraction of each sub-field is 2, the combination of the plurality of sub-fields in the PWM driving region can also display the number of the critical gray scales and more, that is, the number of the gray scales that can be displayed in the PWM driving region can be more than the number of the gray scales that need to be displayed in the PWM driving region, and only in the actual driving process, the driving display of the number of the critical gray scales and more is still selected as the first driving strategy.
The number of sub-fields corresponding to the second driving strategy is at least the order multiplier of the critical gray scale number, namely s is more than or equal to n. The following description will be given by taking an example in which the light emission ratio of the subsequent subfield is twice the light emission ratio of the previous subfield, and actually, the light emission ratios of the subsequent subfield and the previous subfield are not particularly limited, and here, for convenience of understanding, the present application is not to be construed as being limited. When s is the minimum value, i.e. n, the light emitting ratio of n subfields is: 1:2 1 :2 2 …2 n-1 N-1 sub-fields are respectively combined to realize 1 gray scale to 2 gray scales n -1 gray scale luminance, the ratio of the minimum light emitting ratio of the sub-fields to the gray scale is 1. Further, when s = n +1, the light emitting ratio of s subfields is: 1:2 1 :2 2 …2 n N sub-fields are respectively combined to realize 1 gray scale to 2 gray scales n -1 gray scale luminance, the ratio of the minimum light emitting ratio of the sub-fields to the gray scale is 2. In this way, the more the sub-field division number corresponding to the second driving strategy is, the thinner the minimum light-emitting ratio unit division of the sub-field is, so that the gray scale display and the transition between different pixels are more stable and natural.
Therefore, the target light-emitting sub-field in the s sub-fields corresponding to the second driving strategy is determined according to the number of the gray scales to be displayed. And combining the second driving mode and the target light-emitting sub-field to obtain a second driving strategy. And controlling the target light-emitting sub-field according to a second driving mode, namely controlling the target light-emitting sub-field according to a PWM driving mode to realize the display of the corresponding gray scale.
In the following description, taking a 60Hz refresh rate and a critical gray scale number of 32 gray scales as an example for performing hybrid driving on a pixel circuit with 8-bit gray scales, as shown in fig. 5, a frame is divided into 6 sub-fields, wherein a PWM-driven area is divided into 5 sub-fields, and the light emitting ratio of each sub-field is 1:21:22:23:24,pam drive region one sub-frame alone. When the number of the Gray scales to be displayed is below 32 Gray scales, 5 sub-fields in the PWM area are driven, and if Gray5 is to be realized, subframe1 and subframe3 emit light; to realize Gray31, subframes 1 to 5 all emit light. When the number of gray scales to be displayed is 32 or more, only subframe6 emits light, and the luminance is controlled by the data voltage.
In some embodiments of the present application, before the step S1, obtaining the number of to-be-displayed gray scales of the pixel circuit, the method further includes:
s01, acquiring a driving adjustment instruction, wherein the driving adjustment instruction comprises a mapping relation between a driving strategy and the number of displayed gray scales and/or the number of critical gray scales;
and S02, updating according to the driving regulation instruction to obtain a new mapping relation and a critical gray scale number.
Specifically, in this embodiment, the driving adjustment instruction includes a mapping relationship between the driving strategy and the displayed gray scale number and a critical gray scale number, and a user may change the mapping relationship and the critical gray scale number by inputting the driving adjustment instruction, for example, if a problem of low gray scale color shift still exists after practical application or detection, the critical gray scale number may be adjusted.
It should be noted that, for the mapping relationship between the driving strategy and the number of displayed gray scales, the mapping relationship is not only adjusted based on the change of the critical gray scale number, but also other parameters of the PWM driving and the PAM driving in the mapping relationship can be adjusted on the premise that the critical gray scale number is not changed, for example, to obtain a better display effect of low gray scale, the number of sub-fields divided by the PWM driving is adjusted, and more sub-fields are divided.
For the acquisition of the drive adjustment instruction, it is possible to adjust the controller of the pixel circuit such as a chip. In addition, in order to further simplify the obtaining mode of the driving adjustment instruction and reduce the difficulty of adjustment, different critical gray scale numbers and different parameters in the mapping relation can be preset for packaging, and a user can select and adjust through any equipment connected with the controller of the driving mode of the pixel circuit, so that the controller of the driving mode of the pixel circuit obtains the driving adjustment instruction.
And updating according to the driving regulation instruction to obtain a new mapping relation and the critical gray scale number, and then driving the pixel circuit according to the new mapping relation and the critical gray scale number. In this embodiment, the step of adjusting the mapping relationship and the critical gray scale number according to the driving adjustment instruction may be before the gray scale number to be displayed of the pixel circuit is obtained at the beginning, or after the pixel circuit is driven according to the target driving strategy at the end, or may be any step in the whole process on the premise of not affecting the elements of the pixel circuit, which is not specifically limited in this embodiment.
In the embodiment, the problem of color cast of the PAM drive in low gray scales can be solved, and the low gray scale display effect is enhanced. Different light emitting proportions of the PWM region/PAM region can be flexibly adjusted, and different requirements are met. In addition, different numbers of subfields can be flexibly divided according to the low gray level requirement, and the driving is simple in time sequence and easy to realize.
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 the related descriptions of other embodiments.
An embodiment of the present application provides a pixel driving device, including: one or more processors; a memory; and one or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the processor to implement the pixel circuit driving method.
Embodiments of the present application provide a display device, which includes a pixel driving device applied as described in the above embodiments.
In some embodiments of the present application, a computer-readable storage medium is provided, which stores a computer program, and the computer program is loaded by a processor, so that the processor executes the steps of the above-mentioned contraband detection model training method. Here, the steps of the contraband detection model training method may be steps in the contraband detection model training methods of the above embodiments.
It will be understood by those of ordinary skill in the art that all or part of the processes of the methods of the embodiments described above may be implemented by instructing relevant hardware by a computer program, where the computer program may be stored in a non-volatile computer-readable storage medium, and when executed, the computer program may include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).
All possible combinations of the technical features in the above embodiments may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above detailed description is provided for a pixel circuit driving method, a pixel driving device and a display device provided in the embodiments of the present application, and specific examples are applied herein to explain the principles and implementations of the present application, and the description of the above embodiments is only used to help understanding the technical solutions and their core ideas of the present application; 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 disclosure as defined by the appended claims.
Claims (10)
1. A pixel circuit driving method, comprising:
acquiring the number of gray scales to be displayed of a pixel circuit;
determining a target driving strategy of the number of the gray scales to be displayed according to a mapping relation between a preset driving strategy and the number of the displayed gray scales and the number of the gray scales to be displayed;
driving the pixel circuit according to the target drive strategy; the method specifically comprises the following steps:
each display period of the pixel circuit comprises s +1 sub-fields, one sub-field is used for a pulse amplitude modulation strategy, and the s sub-fields are used for a pulse width modulation strategy;
and when the number of the gray scales to be displayed is less than the critical gray scale number, determining a target luminous sub-field in the s sub-fields according to the number of the gray scales to be displayed, and controlling the target luminous sub-field to emit light.
2. The method for driving a pixel circuit according to claim 1, wherein the determining the target driving strategy for the number of gray scales to be displayed according to the mapping relationship between the preset driving strategy and the number of gray scales to be displayed comprises:
when the number of the gray scales to be displayed is larger than or equal to a critical gray scale number, determining that a first driving strategy is the target driving strategy according to the mapping relation and the number of the gray scales to be displayed, wherein the critical gray scale number is the gray scale number at the critical position where the first driving strategy and a second driving strategy are switched in the mapping relation;
and when the number of the gray scales to be displayed is less than the critical number of the gray scales, determining a second driving strategy as the target driving strategy according to the mapping relation and the number of the gray scales to be displayed.
3. The pixel circuit driving method according to claim 2, wherein the first driving strategy is a pulse amplitude modulation strategy, and the driving the pixel circuit according to the target driving strategy comprises:
and modulating the pulse amplitude of the pixel circuit according to the pulse amplitude modulation strategy so as to adjust the luminous intensity of the pixel circuit by controlling the current magnitude of the pixel circuit.
4. A pixel circuit driving method according to claim 3, wherein the second driving strategy is a pulse width modulation strategy, and the driving the pixel circuit according to the target driving strategy comprises:
and modulating the pulse width of the pixel circuit according to the pulse width modulation strategy so as to adjust the luminous intensity of the pixel circuit by controlling the luminous time of the pixel circuit.
5. The pixel circuit driving method according to claim 4, wherein the number of the critical gray levels is 2 n The pixel circuit is an m-bit gray scale pixel circuit, m is larger than n, m and n are both positive integers, each display period of the pixel circuit comprises s +1 sub-fields, s is larger than or equal to n, s is a positive integer, the first driving strategy is a driving strategy of one sub-field, and the second driving strategy is a driving strategy of s sub-fields except the sub-field of the first driving strategy.
6. The method for driving a pixel circuit according to claim 5, wherein the determining the first driving policy as the target driving policy according to the mapping relationship and the number of the to-be-displayed gray scales when the number of the to-be-displayed gray scales is greater than or equal to a threshold number comprises:
when the number of the gray scales to be displayed is more than or equal to the number of the critical gray scales, determining a first driving mode according to the mapping relation;
determining the data voltage value of the pixel circuit according to the number of the gray scales to be displayed;
obtaining the first driving strategy according to the first driving mode and the data voltage value;
driving the pixel circuit according to the target drive strategy, comprising:
and controlling one subfield corresponding to the first driving strategy to emit light according to the first driving strategy and the data voltage value.
7. The pixel circuit driving method according to claim 5, wherein the light emitting ratio of s subfields corresponding to the second driving strategy is: 1:2 a :2 b …2 s-1 ，s≥2，1+2 a +2 b +…+2 s-1 ≥2 n -1,a, b is any positive integer; when the number of the gray scales to be displayed is t, any one or more sub-fields in the s sub-fields emit light, and t is more than or equal to 1 and less than 2 n T is any positive integer;
when the number of the gray scales to be displayed is less than the critical number of the gray scales, determining a second driving strategy as the target driving strategy according to the mapping relation and the number of the gray scales to be displayed, wherein the method comprises the following steps:
when the number of the gray scales to be displayed is less than the critical number of the gray scales, determining a second driving mode according to the mapping relation;
determining a target light-emitting sub-field in the s sub-fields according to the number of the gray scales to be displayed;
obtaining the second driving strategy according to the second driving mode and the target light-emitting sub-field;
driving the pixel circuit according to the target drive strategy, comprising:
and controlling the target light-emitting sub-field to emit light according to the second driving mode.
8. The pixel circuit driving method according to claim 1, wherein before the obtaining of the number of gray scales to be displayed of the pixel circuit, the method further comprises:
acquiring a driving adjustment instruction, wherein the driving adjustment instruction comprises a mapping relation between a driving strategy and the number of displayed gray scales and/or the number of critical gray scales;
and updating according to the driving regulation instruction to obtain a new mapping relation and a critical gray scale number.
9. A pixel driving device, comprising:
one or more processors;
a memory; and one or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the processor to implement the pixel circuit driving method of any one of claims 1 to 8.
10. A display device comprising a pixel driving device according to claim 9.
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| CN114373420A (en) * | 2022-01-14 | 2022-04-19 | 深圳市华星光电半导体显示技术有限公司 | Display panel driving method, display driving circuit and display panel |
| CN114512087A (en) * | 2022-01-26 | 2022-05-17 | Tcl华星光电技术有限公司 | Pixel circuit and display panel |
| CN114664234B (en) * | 2022-03-17 | 2023-06-30 | Tcl华星光电技术有限公司 | Hybrid driving method of display and hybrid driving module of display |
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