CN114664234B - Hybrid driving method of display and hybrid driving module of display - Google Patents

Hybrid driving method of display and hybrid driving module of display Download PDF

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CN114664234B
CN114664234B CN202210267691.6A CN202210267691A CN114664234B CN 114664234 B CN114664234 B CN 114664234B CN 202210267691 A CN202210267691 A CN 202210267691A CN 114664234 B CN114664234 B CN 114664234B
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subframe
gray scale
display
displayed
driving
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CN114664234A (en
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刘桉语
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TCL Huaxing Photoelectric Technology Co Ltd
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TCL Huaxing Photoelectric Technology Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The application relates to a hybrid driving method of a display and a hybrid driving module of the display, wherein the method comprises the following steps: acquiring gray scales to be displayed, which are input to a display; adjusting the light-emitting duration of at least one first subframe and/or the light-emitting duration of at least one second subframe according to gray scale to be displayed; and driving the display to display according to the adjusted luminous time length of each first subframe and/or the luminous time length of each second subframe. The method and the device adopt hybrid driving and display the gray scale to be displayed by acquiring the gray scale to be input into the display, then adjust the luminous time length of at least one first subframe and/or the luminous time length of at least one second subframe according to the gray scale to be displayed, finally drive the display according to the adjusted luminous time length of each first subframe and/or the luminous time length of each second subframe, so that the brightness uniformity of different gray scales can be improved, the color cast phenomenon and the gray scale overturning phenomenon can be further improved, the uniformity of a display picture is improved, the pocking phenomenon is eliminated, and the display effect of the hybrid driving is improved.

Description

Hybrid driving method of display and hybrid driving module of display
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a hybrid driving method of a display and a hybrid driving module of the display.
Background
In the current display field, continuous development and progress of display technologies such as LED displays and AMOLED displays bring about increasingly abundant display products. Currently, a PAM (Pulse Amplitude Modulation, i.e., pulse amplitude modulation) driving mode is often used to drive a display to display. However, when the PAM driving method is used alone, the color shift phenomenon occurs when a low gray-scale screen is displayed, although the display brightness is not lost.
In the related art, a scheme for improving low gray level color shift and minimizing brightness loss in a PWM and PAM hybrid driving manner has been developed. After the PWM (Pulse Width Modulation, i.e., pulse width modulation) driving is adopted, although the low gray scale color shift phenomenon is improved, in order to reduce power consumption, display brightness is reduced. Therefore, the improvement effect of the color shift phenomenon is to be improved.
In addition, in the related art, the thin film transistor in each pixel circuit of the display needs a certain time for turning on and off due to the influence of its own characteristics. The problem of gray scale overturning in the PWM driving mode is caused, so that the visual experience of human eyes is reduced, and the watching effect is influenced.
Disclosure of Invention
In view of this, the present application provides a hybrid driving method of a display and a hybrid driving module of a display, which can improve brightness uniformity of different gray scales, further improve color cast phenomenon and gray scale overturning phenomenon, and simultaneously improve uniformity of a display screen, eliminate pock phenomenon, and improve display effect of hybrid driving.
According to an aspect of the present application, there is provided a hybrid driving method of a display, wherein a frame for driving the display includes at least one first subframe and at least one second subframe, the first subframe is driven by a first driving mode, and the second subframe is driven by a second driving mode, and the hybrid driving method of the display includes: acquiring gray scales to be displayed, which are input to the display; adjusting the light-emitting duration of at least one first subframe and/or the light-emitting duration of at least one second subframe according to the gray scale to be displayed; and driving the display to display according to the adjusted luminous time length of each first subframe and/or the luminous time length of each second subframe.
Further, adjusting the light emitting duration of at least one first subframe and/or the light emitting duration of at least one second subframe according to the gray scale to be displayed includes: acquiring a gray scale range of the display; dividing the gray scale range of the display into a first gray scale interval and a second gray scale interval, wherein the first gray scale interval corresponds to the first driving mode, and the second gray scale interval corresponds to the second driving mode; and adjusting the light-emitting duration of at least one first subframe and/or the light-emitting duration of at least one second subframe according to the gray scale interval in which the gray scale to be displayed is located.
Further, adjusting the light emitting duration of at least one first subframe and/or the light emitting duration of at least one second subframe according to the gray scale interval where the gray scale to be displayed is located, including: when the gray scale interval where the gray scale to be displayed is located is a first gray scale interval, adjusting the light emitting duration of at least one first subframe; and when the gray scale interval in which the gray scale to be displayed is positioned is a second gray scale interval, adjusting the light emitting duration of at least one second subframe.
Further, when the gray scale interval where the gray scale to be displayed is the first gray scale interval, adjusting the light emitting duration of at least one first subframe includes: acquiring a weight threshold corresponding to the first gray scale interval; and adjusting the light emitting duration of at least one first subframe according to the weight threshold.
Further, the display includes a pixel circuit, a driving transistor is disposed in the pixel circuit, and the driving transistor is configured to receive a first driving signal corresponding to the first driving mode, obtain a weight threshold corresponding to the first gray scale interval, and include: acquiring the switching time of the driving transistor, wherein the switching time is the time from the on to the off of the driving transistor; acquiring the total luminous duration of each first subframe corresponding to the gray scale to be displayed; obtaining weight coefficients corresponding to the first subframes according to the total luminous duration of the first subframes corresponding to the gray scales to be displayed and the switching time; and determining the weight threshold according to each weight coefficient.
Further, obtaining the weight coefficient corresponding to each first subframe according to the total light emitting duration of each first subframe corresponding to the gray scale to be displayed and the switching time, including: acquiring the working time length of each first subframe; and obtaining the weight coefficient corresponding to each first subframe according to the working time of each first subframe, the total luminous time of each first subframe corresponding to the gray scale to be displayed and the switching time.
Further, adjusting the light emitting duration of at least one first subframe according to the weight threshold value includes: when the weight coefficient corresponding to the first subframe is greater than or equal to the weight threshold value, reducing the light-emitting duration of the first subframe; and when the weight coefficient corresponding to the first subframe is smaller than the weight threshold value, keeping the luminous duration of the first subframe unchanged.
Further, when the gray scale interval in which the gray scale to be displayed is located is a second gray scale interval, adjusting the light emitting duration of at least one second subframe includes: increasing the gamma voltage corresponding to the gray scale to be displayed; and reducing the light emitting duration of at least one second subframe.
Further, driving the display to display according to the adjusted light emitting duration of each first subframe and/or the adjusted light emitting duration of each second subframe, including: correcting the gamma curve of the display according to the adjusted luminous time length of each first subframe and/or the luminous time length of each second subframe to obtain a corrected gamma curve; and driving the display to display according to the corrected gamma curve.
According to another aspect of the present application, there is provided a hybrid driving module of a display, driving a frame of the display includes at least one first subframe and at least one second subframe, the first subframe is driven by a first driving mode, and the second subframe is driven by a second driving mode, the hybrid driving module includes: the to-be-displayed gray scale acquisition module is used for acquiring to-be-displayed gray scales input to the display; the luminous time length adjusting module is electrically connected with the gray scale obtaining module to be displayed and is used for adjusting the luminous time length of at least one first subframe and/or the luminous time length of at least one second subframe according to the gray scale to be displayed; the driving display module is electrically connected with the luminous time length adjusting module and is used for driving the display to display according to the adjusted luminous time length of each first subframe and/or the luminous time length of each second subframe.
The display is driven to display according to the adjusted luminous duration of each first subframe and/or the luminous duration of each second subframe, and according to aspects of the application, the brightness uniformity of different gray scales can be improved, the color cast phenomenon and the gray scale overturning phenomenon are further improved, meanwhile, the uniformity of a display picture is improved, the phenomenon of pockmarks is eliminated, and the display effect of the hybrid drive is improved.
Drawings
Technical solutions and other advantageous effects of the present application will be made apparent from the following detailed description of specific embodiments of the present application with reference to the accompanying drawings.
Fig. 1 shows a schematic diagram of a related art pixel circuit.
Fig. 2 shows a schematic diagram of a related art PAM and PWM hybrid drive.
Fig. 3 shows a flow chart of a hybrid driving method of an embodiment of the present application.
Fig. 4 is a schematic diagram illustrating hybrid driving corresponding to the first gray scale interval according to an embodiment of the present application.
Fig. 5 is a schematic diagram illustrating hybrid driving corresponding to the second gray level segment according to the embodiment of the present application.
Fig. 6 shows a schematic diagram of an operating curve of a driving transistor according to an embodiment of the present application.
Fig. 7 shows a schematic diagram of a hybrid driving method according to an embodiment of the present application.
Fig. 8 shows a schematic structural diagram of a hybrid driving module 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 will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements or interaction relationship between the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials. In some instances, methods, means, elements, and circuits have not been described in detail as not to unnecessarily obscure the present application.
Fig. 1 shows a schematic diagram of a related art pixel circuit.
As shown in fig. 1, in the related art, the pixel circuit has a 4T1C structure. Specifically, the pixel circuit includes a first transistor T1, a second transistor T2, a driving transistor T3, a switching transistor DT, a storage capacitor Cst, and a light emitting member LED. The grid electrode of the first transistor is electrically connected with the scanning signal G1, the source electrode of the first transistor is electrically connected with the Data signal Data, and the drain electrode of the first transistor is respectively electrically connected with the source electrode of the driving transistor, the grid electrode of the switching transistor and one end of the storage capacitor to form a circuit node G; the grid electrode of the second transistor is electrically connected with the sensing signal G2, the source electrode of the second transistor is respectively electrically connected with the source electrode of the switching transistor DT, the other end of the storage capacitor and the anode of the light-emitting component to form a circuit node s, and the voltage of the drain electrode of the second transistor is a reference voltage Vref; the grid electrode of the driving transistor T3 is electrically connected with the driving signal G3, and the drain electrode of the driving transistor is electrically connected with the negative voltage Vneg; the drain electrode of the switching transistor DT is electrically connected with the power supply voltage VDD; the cathode of the light emitting element is grounded (i.e., VSS).
In actual operation, the driving signal G3 may be a PWM signal. Under the control of the scanning signal G1, the first transistor T1 can be turned on first, data is written into the circuit node G, the storage capacitor is used for storing charge, the voltage of the circuit node G is increased along with the charge, the switching transistor is turned on, and the light emitting component starts to emit light; then the first transistor T1 is turned off, the voltage of the circuit node g is unchanged due to the charge stored in the storage capacitor, the switching transistor is turned on, and the light emitting component still emits light; then, the driving signal G3 turns on the driving transistor T3, a negative voltage is written to the circuit node G, the switching transistor is turned off, and the light emitting part does not emit light.
Fig. 2 shows a schematic diagram of a related art PAM and PWM hybrid drive.
As shown in fig. 2, PAM and PWM hybrid driving are employed in the related art. Vneg may be 0V. When the driving transistor G3 is turned on (i.e., turned on), the light emitting section ends light emission. Wherein one frame may include 10 subframes. The individual subframes of PAM are scattered and evenly distributed to be inserted after the individual subframes of PWM. For example, in the first subframe of PWM, 1/16t (t is the time length of the PWM subframe) of time G3 is turned on, and the light emitting means ends light emission; in the first subframe of PAM, G4 is not turned on, and the light emitting means continues to emit light.
For another example, when the gray level is 15, the first, second, third and fourth subframes of the PWM in fig. 2 are operated simultaneously, and the operating time is t/16+t/8+t/4+t/2= (15/16) t; at a gray level of 16, the fifth sub-frame of the PWM in fig. 2 is operated for an operation time of t. Assuming that the time from turning on to turning off the intermediate level of the driving transistor G3 is X, when the gray scale is 15, the operation time is (t/16+x) + (t/8+X) + (t/4+X) + (t/2+x) = (15/16) t+4x; when the gray scale is 16, the working time is t+X. Since the brightness is related to the product of the operating current and the light emitting time, if the operating time at 15 gray scales is longer than the operating time at 16 gray scales due to the influence of the driving transistor in the case of the fixed operating current, the brightness at 15 gray scales is greater than the brightness at 16 gray scales, that is, the brightness at low gray scales may be greater than the brightness at higher gray scales, thereby causing a gray scale inversion problem.
In view of this, the present application provides a hybrid driving method of a display, where a frame for driving the display includes at least one first subframe and at least one second subframe, the first subframe is driven by a first driving mode, and the second subframe is driven by a second driving mode, and the hybrid driving method of the display includes: acquiring gray scales to be displayed, which are input to the display; adjusting the light-emitting duration of at least one first subframe and/or the light-emitting duration of at least one second subframe according to the gray scale to be displayed; and driving the display to display according to the adjusted luminous time length of each first subframe and/or the luminous time length of each second subframe.
The display is driven to display according to the adjusted luminous duration of each first subframe and/or the luminous duration of each second subframe.
Fig. 3 shows a flow chart of a hybrid driving method of an embodiment of the present application.
As shown in fig. 3, the hybrid driving method of the embodiment of the present application may be used for a display. It will be appreciated that there are a variety of types of displays and the present application is not limited to a type of display. Specifically, the hybrid driving method may include:
step S1: acquiring gray scales to be displayed, which are input to the display;
the gray scale to be displayed of the display may be a target gray scale to be displayed. For example, the gray scale of the display may be represented by 8 bits, respectively 0 to 255 gray scales, for a total of 256 (28) gray scales. Each gray level may represent a corresponding brightness level. The gray scale to be displayed of the display can be any gray scale from 0 to 255 gray scales and is preset.
Step S2: adjusting the light-emitting duration of at least one first subframe and/or the light-emitting duration of at least one second subframe according to the gray scale to be displayed;
it should be noted that, in the embodiment of the present application, hybrid driving may be performed by using the first driving manner and the second driving manner. The first driving method may be a PWM driving method, and the second driving method may be a PAM driving method. It can be appreciated that, in addition to the first driving manner and the second driving manner, more than two different driving manners may be adopted to perform hybrid driving in the embodiments of the present application. Based on the inventive concept of the present application, reasonable expansion and deformation made by the hybrid driving according to the embodiments of the present application all belong to the protection scope of the present application.
Further, each first subframe adopts a first driving mode, and each second subframe adopts a second driving mode. In the case that the gray levels to be displayed are different, the working states of the first subframes and the second subframes in one frame may not be the same.
Further, adjusting the light emitting duration of at least one first subframe and/or the light emitting duration of at least one second subframe according to the gray scale to be displayed includes:
step S21: acquiring a gray scale range of the display;
the gray scale range of the display may be a target gray scale range displayed by the display. For example, the gray scale range of the display may be 0 to 255 gray scales. It is noted that for a still picture, the gray scale range of the picture is not necessarily 0 to 255 gray scales, but may be a range similar to 64 to 128 gray scales. In practical application, the gray scale range can be dynamically adjusted as required.
Step S22: dividing the gray scale range of the display into a first gray scale interval and a second gray scale interval, wherein the first gray scale interval corresponds to the first driving mode, and the second gray scale interval corresponds to the second driving mode;
For example, the gray scale range of the display may be 0 to 255 gray scales. At this time, the 0 to 31 gray scales may be divided into a first gray scale section, i.e., a low gray scale section; the 32 to 255 gray scales are divided into a second gray scale interval, i.e., a high gray scale interval. In the first gray scale interval, the display can display in a first driving mode; in the second gray scale interval, the display can display in a second driving mode. In the first gray-scale section, the display may be displayed by the second driving method. It is understood that the mapping relationship between the gray scale interval and the driving mode is not limited in this application.
Step S23: and adjusting the light-emitting duration of at least one first subframe and/or the light-emitting duration of at least one second subframe according to the gray scale interval in which the gray scale to be displayed is located.
The adjusting the light emitting duration of at least one first subframe and/or the light emitting duration of at least one second subframe according to the gray scale interval where the gray scale to be displayed is located comprises:
step S231: when the gray scale interval where the gray scale to be displayed is located is a first gray scale interval, adjusting the light emitting duration of at least one first subframe;
Fig. 4 is a schematic diagram illustrating hybrid driving corresponding to the first gray scale interval according to an embodiment of the present application.
As shown in fig. 4, in the one-frame structure, the PWM driving method corresponds to 5 first subframes, which are a PWM first subframe, a PWM second subframe, a PWM third subframe, a PWM fourth subframe, and a PWM fifth subframe, respectively. To avoid confusion, in the embodiments of the present application, each of the above 5 subframes may be referred to as a first subframe. In fig. 4, the PAM driving method corresponds to 5 second subframes, that is, each PAM subframe in fig. 4, and each of the 5 PAM subframes may be referred to as a second subframe. Note that, in fig. 4, the duration of each first subframe is equal, and the duration of each second subframe is also equal. In practical application, the duration of each subframe corresponding to the PWM driving mode may be different, and the duration of each subframe corresponding to the PAM driving mode may also be different. It can be understood that, the present application is not limited to whether the subframes corresponding to the PWM driving method are the same or not and whether the subframes corresponding to the PAM driving method are the same or not.
Further, when the gray scale interval where the gray scale to be displayed is the first gray scale interval, adjusting the light emitting duration of at least one first subframe includes:
Step S2311: acquiring a weight threshold corresponding to the first gray scale interval;
the weight threshold corresponding to the first gray scale interval can be adjusted according to actual conditions. For example, since the driving methods and driving circuits used in different driving modes may be different, the weight threshold corresponding to the first gray scale interval may be adjusted according to the corresponding driving method and driving circuit. It is to be understood that the present application is not limited to the weight threshold.
Further, the display may include a pixel circuit, in which a driving transistor is disposed, and the driving transistor is configured to receive a first driving signal corresponding to the first driving mode. For example, in the embodiment of the present application, the pixel circuit may be the pixel circuit in fig. 1, the driving transistor in the embodiment of the present application may be the driving transistor T3 in fig. 1, and the first driving signal may be a PWM signal. The driving transistor may be a thin film transistor.
Further, acquiring a weight threshold corresponding to the first gray-scale interval includes:
step A1: acquiring the switching time of the driving transistor, wherein the switching time is the time from the on to the off of the driving transistor;
The types of the driving transistors can be different in different application scenes, and the switching time can also be different for different types of driving transistors. The switching time can be an ideal value or can be measured by using related equipment. In this embodiment of the present application, a plurality of pixel circuits may be provided, and it is assumed that switching times of driving transistors in each pixel circuit are the same, and are all X. It will be appreciated that the present application is not limited as to how the switch transition time is obtained.
Step A2: acquiring the total luminous duration of each first subframe corresponding to the gray scale to be displayed;
the light emitting duration of each first subframe may be a duration of a frame in which each first subframe can make a corresponding light emitting component emit light. For example, in fig. 4, for a first subframe of PMW, assuming that the total duration of the first subframe is t, the light emitting duration of the first subframe is 1/16t.
Step A3: obtaining weight coefficients corresponding to the first subframes according to the total luminous duration of the first subframes corresponding to the gray scales to be displayed and the switching time;
Further, obtaining the weight coefficient corresponding to each first subframe according to the total light emitting duration of each first subframe corresponding to the gray scale to be displayed and the switching time, including:
step A31: acquiring the working time length of each first subframe;
in an exemplary embodiment, in one frame, the working time length of each first subframe is the total time length of the first subframe, and the working time lengths of the first subframes are equal and are all t.
Step A32: and obtaining the weight coefficient corresponding to each first subframe according to the working time of each first subframe, the total luminous time of each first subframe corresponding to the gray scale to be displayed and the switching time.
For example, the gray level to be displayed is 15, and at this time, the PWM first subframe, the PWM second subframe, the PWM third subframe, the PWM fourth subframe, and the PWM fifth subframe in fig. 4 are simultaneously operated, and the actual total lighting duration is (t/16+x) + (t/8+X) + (t/4+X) + (t/2+x) = (15/16) t+4x; the gray level to be displayed is 16, and at this time, the PWM fifth subframe in fig. 4 works, and the total light emitting duration is t+x. In actual operation, the total light emitting duration of each first subframe corresponding to the gray scale to be displayed may be determined by measuring by an instrument, and at this time, the working duration of each first subframe and the switching time are both known amounts, so that the weight coefficient corresponding to each first subframe may be obtained.
Step A4: and determining the weight threshold according to each weight coefficient.
For example, the weight coefficients may be sorted, and an intermediate value may be selected as the weight threshold. For example, in the embodiment of the present application, the weight threshold may be 3. In practical applications, the weight threshold may also be adaptively adjusted according to the actually measured gamma curve.
Step S2312: and adjusting the light emitting duration of at least one first subframe according to the weight threshold.
Further, adjusting the light emitting duration of at least one first subframe according to the weight threshold value includes:
step B1: when the weight coefficient corresponding to the first subframe is greater than or equal to the weight threshold value, reducing the light-emitting duration of the first subframe;
for example, the gray level to be displayed is 7, and at this time, the PWM first sub-frame, the PWM second sub-frame, and the PWM third sub-frame in fig. 4 are simultaneously operated, and the actual total lighting duration is (t/16+x) + (t/8+X) + (t/4+X) = (7/16) t+3x; the gray scale to be displayed is 8, and at this time, the fourth sub-frame of the PWM in fig. 4 works, and the total light emitting duration is (8/16) t+x.
In the above example, when the gray level to be displayed is 15, the weight coefficient is 4 (i.e., the coefficient corresponding to X); when the gray scale to be displayed is 16, the weight coefficient is 1; when the gray level to be displayed is 7, the weight coefficient is 3; and when the gray scale to be displayed is 16, the weight coefficient is 1. Because the probability of occurrence of gray scale inversion becomes larger due to the increase of the weight coefficient, the embodiment of the application sets the weight threshold to judge which condition to adjust the duration of each subframe. For example, the weight threshold may be set to 3. And when the weight coefficient corresponding to the gray scale to be displayed is greater than or equal to 3, the driving transistor is started in advance, so that the driving transistor discharges in advance. For example, in FIG. 4, the duration of the PWM third sub-frame (i.e., the 3 rd first sub-frame) may be adjusted from 4/16t to 3.5/16t.
Step B2: and when the weight coefficient corresponding to the first subframe is smaller than the weight threshold value, keeping the luminous duration of the first subframe unchanged.
For example, the gray level to be displayed is 3, and at this time, the PWM first subframe, the PWM second subframe, and the PWM third subframe operate simultaneously, and the actual total lighting duration is (t/16+x) + (t/8+X) = (3/16) t+2x; the gray level to be displayed is 4, at this time, the fourth sub-frame of PWM works, and the total lighting duration is (4/16) t+X. Because the weight coefficient corresponding to the gray level 3 is 2 and the weight coefficient 1 corresponding to the gray level 4 does not exceed the weight threshold, the light emitting duration of each first subframe with the gray level 3 to be displayed and the gray level 4 to be displayed is kept unchanged.
Step S232: and when the gray scale interval in which the gray scale to be displayed is positioned is a second gray scale interval, adjusting the light emitting duration of at least one second subframe.
Further, when the gray scale interval in which the gray scale to be displayed is located is a second gray scale interval, adjusting the light emitting duration of at least one second subframe includes:
step S2321: increasing the gamma voltage corresponding to the gray scale to be displayed;
step S2322: and reducing the light emitting duration of at least one second subframe.
Because the actual luminous efficiency of each lamp bead in the display may be different, in the second gray scale interval, the driving current of part of the lamp beads may be in an unstable interval, so that the display picture of the display may have a pitting phenomenon.
Therefore, based on the fact that the brightness is proportional to the product of the light emitting duration and the driving current, the embodiment of the application can compensate unstable driving current corresponding to part of the lamp beads by reducing the duration of at least one second subframe corresponding to the PAM driving mode and increasing the corresponding gamma voltage, and then the pock phenomenon is eliminated.
Fig. 5 is a schematic diagram illustrating hybrid driving corresponding to the second gray level segment according to the embodiment of the present application.
As shown in fig. 5, in one frame, the PAM driving method corresponds to 5 second subframes (i.e., PAM subframes). Wherein the light emitting duration of each second subframe can be reduced from t to t-t 0 . Reduced amplitude t 0 May be related to the switching time, for example may be several times the switching time. the t0 can also be adjusted according to the gamma voltage or other parameters which are actually measured so as to compensate the unstable current corresponding to part of the lamp beads, so that the brightness of each lamp bead is uniform, and the phenomenon of pocking marks is eliminated. It is understood that the value of the specific change of the light emitting duration of each second subframe is not limited in this application.
Step S3: and driving the display to display according to the adjusted luminous time length of each first subframe and/or the luminous time length of each second subframe.
Further, driving the display to display according to the adjusted light emitting duration of each first subframe and/or the adjusted light emitting duration of each second subframe, including:
step S31: correcting the gamma curve of the display according to the adjusted luminous time length of each first subframe and/or the luminous time length of each second subframe to obtain a corrected gamma curve;
step S32: and driving the display to display according to the corrected gamma curve.
Wherein the corrected gamma curve may be a gamma2.2 curve. It will be appreciated that embodiments of the present application are not limited in terms of how the gamma curve of the display is modified.
Fig. 6 shows a schematic diagram of an operating curve of a driving transistor according to an embodiment of the present application.
Fig. 6 is an exemplary output characteristic of the driving transistor. Wherein the horizontal axis represents the voltage V between the gate and the source of the driving transistor GS The vertical axis represents the drain current I of the driving transistor D . The left side is a plot under Pu Er-French effect (i.e., poole-Frenkel emission); in the middle is a curve of sub-threshold characteristics (i.e., sub-threshold), and on the right is a curve of super-threshold characteristics (above-threshold). For different source-drain voltages V DS The output characteristic curves also differ.
Referring to fig. 6, for front-end channels (front), a forward subthreshold (forward-threshold) causes a round black dot to lie above the corresponding solid line; for the back channel, the inverted subthreshold (reverse-threshold) causes the circular black point to lie below the corresponding solid line. In the embodiment of the present application, however, in the process of converting from the reverse sub-threshold to the forward sub-threshold (i.e., the region 61 in fig. 6), the process of turning on to off the driving transistor needs to maintain a level for a period of time due to the influence of the characteristics of the driving transistor itself.
Fig. 7 shows a schematic diagram of a hybrid driving method according to an embodiment of the present application.
As shown in fig. 7, in the embodiment of the present application, first, gray-scale data may be input, and then, whether the gray-scale data is high gray-scale or low gray-scale is identified by an algorithm. If the gray level data is low gray level, adopting a PWM driving mode, and identifying whether N (i.e. weight coefficient) of a data low gray level area is greater than or equal to 3 (i.e. weight threshold) through an algorithm. If the weight coefficient of the gray scale is greater than or equal to the weight threshold, starting a discharge time adjustment algorithm 1 so as to approach a corrected gamma2.2 curve, and finally outputting the corrected gamma2.2 curve; if the weight coefficient of the gray scale is smaller than the weight threshold, closing the discharge time adjustment algorithm 1; if the gray level data is high gray level, adopting a PAM driving mode, and starting a discharge time adjusting algorithm 2 to eliminate the pock phenomenon.
In addition, the application also provides a hybrid driving module of a display, wherein a frame for driving the display comprises at least one first subframe and at least one second subframe, the first subframe is driven by adopting a first driving mode, the second subframe is driven by adopting a second driving mode, and the hybrid driving module comprises: the to-be-displayed gray scale acquisition module is used for acquiring to-be-displayed gray scales input to the display; the luminous time length adjusting module is electrically connected with the gray scale obtaining module to be displayed and is used for adjusting the luminous time length of at least one first subframe and/or the luminous time length of at least one second subframe according to the gray scale to be displayed; the driving display module is electrically connected with the luminous time length adjusting module and is used for driving the display to display according to the adjusted luminous time length of each first subframe and/or the luminous time length of each second subframe.
Further, the light emitting duration adjustment module includes: the gray scale range acquisition module is used for acquiring the gray scale range of the display; the gray scale division module is used for dividing the gray scale range of the display into a first gray scale interval and a second gray scale interval, wherein the first gray scale interval corresponds to the first driving mode, and the second gray scale interval corresponds to the second driving mode; the first adjusting module is used for adjusting the light-emitting duration of at least one first subframe and/or the light-emitting duration of at least one second subframe according to the gray scale interval where the gray scale to be displayed is located.
Further, the first adjustment module includes: the first gray scale interval adjusting module is used for adjusting the light emitting duration of at least one first subframe when the gray scale interval where the gray scale to be displayed is located is the first gray scale interval; the second gray scale interval adjusting module is used for adjusting the light emitting duration of at least one second subframe when the gray scale interval where the gray scale to be displayed is located is the second gray scale interval.
Further, the first gray scale interval adjustment module includes: the weight threshold value acquisition module is used for acquiring a weight threshold value corresponding to the first gray scale interval; and the weight threshold adjustment module is used for adjusting the light emitting duration of at least one first subframe according to the weight threshold.
Further, the weight threshold obtaining module includes: the switching time acquisition module is used for acquiring the switching time of the driving transistor, wherein the switching time is the time from the on state to the off state of the driving transistor; the total luminous duration acquisition module is used for acquiring the total luminous duration of each first subframe corresponding to the gray scale to be displayed; the weight coefficient acquisition module is used for acquiring weight coefficients corresponding to the first subframes according to the total luminous duration of the first subframes corresponding to the gray scales to be displayed and the switching time; and the weight threshold determining module is used for determining the weight threshold according to each weight coefficient.
Further, the weight coefficient acquisition module includes: the working time length acquisition module is used for acquiring the working time length of each first subframe; the weight coefficient obtaining sub-module is used for obtaining the weight coefficient corresponding to each first subframe according to the working time length of each first subframe, the total luminous time length of each first subframe corresponding to the gray scale to be displayed and the switching time.
Further, the weight threshold adjustment module includes: the second adjusting module is used for reducing the luminous duration of the first subframe when the weight coefficient corresponding to the first subframe is greater than or equal to the weight threshold value; and the third adjusting module is used for keeping the luminous duration of the first subframe unchanged when the weight coefficient corresponding to the first subframe is smaller than the weight threshold value.
Further, the second gray scale interval adjustment module includes: the gamma voltage adjusting module is used for increasing the gamma voltage corresponding to the gray scale to be displayed; and a fourth adjustment module, configured to reduce a light emitting duration of at least one second subframe.
Further, the driving display module includes: the gamma curve correction module is used for correcting the gamma curve of the display according to the adjusted luminous time length of each first subframe and/or the luminous time length of each second subframe to obtain a corrected gamma curve; and the display sub-module is used for driving the display to display according to the corrected gamma curve.
Fig. 8 shows a schematic structural diagram of a hybrid driving module according to an embodiment of the present application.
As shown in fig. 8, the hybrid driving module of the display according to the embodiment of the present application may include an algorithm acquisition gray scale data module, a low gray scale monitoring module, a high gray scale monitoring module, an algorithm adjustment time module 1, and an algorithm adjustment time module 2.
The algorithm acquisition gray-scale data module can input PWM voltage data; the low gray level monitoring module can be used for monitoring the brightness display condition in the low gray level interval, and the high gray level monitoring module can be used for monitoring the brightness display condition in the high gray level interval. The algorithm adjusting time module 1 can be used for adjusting the light-emitting duration of at least one first subframe corresponding to the low gray scale interval, so as to approach the correction gamma2.2 curve; the algorithm adjusting time module 2 may be configured to adjust a light emitting duration of at least one of the second subframes corresponding to the high gray scale interval, so as to correct a pock phenomenon of uneven light emission of the LED. For a more detailed portion of the hybrid driving module of the display, reference may be made to the hybrid driving method of the display, which is not described herein.
Therefore, in the embodiment of the application, by adjusting the time dimension of the low-gray-scale PWM driving mode, whether the time module 1 is started by the weight is calculated, so that gamma gray-scale overturn can be counteracted; the time dimension of the high gray scale PAM driving mode is adjusted, so that the pocking compensation area can be obtained, pocking is eliminated, the display effect of the hybrid driving is optimized, and the display picture specification is more standard.
It will be appreciated that the algorithms in the embodiments of the present application may be implemented in a variety of programming languages, and the present application is not limited to how the various algorithms or methods described above are implemented. Aiming at different application scenes, the method and the device can also have various implementation schemes, and can be adjusted according to actual conditions, so that the cost and the effect are optimized.
In summary, in this embodiment of the present application, by performing hybrid driving in the first driving manner and the second driving manner, and obtaining the gray scale to be displayed input to the display, then adjusting the light emitting duration of at least one first subframe and/or the light emitting duration of at least one second subframe according to the gray scale to be displayed, and finally driving the display to display according to the adjusted light emitting duration of each first subframe and/or the light emitting duration of each second subframe, brightness uniformity of different gray scales can be improved, color cast phenomenon and gray scale turning phenomenon can be further improved, meanwhile, uniformity of a display frame is improved, a pock phenomenon is eliminated, and a display effect of hybrid driving is improved.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The above describes the hybrid driving method of the display and the hybrid driving module of the display provided by the embodiments of the present application in detail, and specific examples are applied to the description of the principles and the implementation manners of the present application, where the description of the above embodiments is only used to help understand the technical solution and the core idea of the present application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims (7)

1. A hybrid driving method of a display, wherein a frame driving the display includes at least one first subframe and at least one second subframe, the first subframe is driven by a first driving mode, the second subframe is driven by a second driving mode, the hybrid driving method of the display includes:
acquiring gray scales to be displayed, which are input to the display;
adjusting the light emitting duration of at least one first subframe and/or the light emitting duration of at least one second subframe according to the gray scale to be displayed, wherein the method comprises the following steps: acquiring a gray scale range of the display; dividing the gray scale range of the display into a first gray scale interval and a second gray scale interval, wherein the first gray scale interval corresponds to the first driving mode, and the second gray scale interval corresponds to the second driving mode; adjusting the light emitting duration of at least one first subframe and/or the light emitting duration of at least one second subframe according to the gray scale interval where the gray scale to be displayed is located, including: when the gray scale interval where the gray scale to be displayed is located is a first gray scale interval, adjusting the light emitting duration of at least one first subframe; when the gray scale interval where the gray scale to be displayed is located is a second gray scale interval, adjusting the light emitting duration of at least one second subframe; when the gray scale interval where the gray scale to be displayed is the first gray scale interval, adjusting the light emitting duration of at least one first subframe includes: acquiring a weight threshold corresponding to the first gray scale interval; adjusting the light-emitting duration of at least one first subframe according to the weight threshold;
And driving the display to display according to the adjusted luminous time length of each first subframe and/or the luminous time length of each second subframe.
2. The method according to claim 1, wherein the display includes a pixel circuit, a driving transistor is disposed in the pixel circuit, the driving transistor is configured to receive a first driving signal corresponding to the first driving mode, and obtain a weight threshold corresponding to the first gray scale interval, and the method includes:
acquiring the switching time of the driving transistor, wherein the switching time is the time from the on to the off of the driving transistor;
acquiring the total luminous duration of each first subframe corresponding to the gray scale to be displayed;
obtaining weight coefficients corresponding to the first subframes according to the total luminous duration of the first subframes corresponding to the gray scales to be displayed and the switching time;
and determining the weight threshold according to each weight coefficient.
3. The method of claim 2, wherein obtaining the weight coefficient corresponding to each first subframe according to the total light emitting duration of each first subframe corresponding to the gray scale to be displayed and the switching time, comprises:
Acquiring the working time length of each first subframe;
and obtaining the weight coefficient corresponding to each first subframe according to the working time of each first subframe, the total luminous time of each first subframe corresponding to the gray scale to be displayed and the switching time.
4. The hybrid driving method of a display according to claim 1, wherein adjusting the light emission duration of at least one of the first subframes according to the weight threshold value comprises:
when the weight coefficient corresponding to the first subframe is greater than or equal to the weight threshold value, reducing the light-emitting duration of the first subframe;
and when the weight coefficient corresponding to the first subframe is smaller than the weight threshold value, keeping the luminous duration of the first subframe unchanged.
5. The method according to claim 1, wherein adjusting the light emission duration of at least one of the second subframes when the gray scale interval in which the gray scale to be displayed is located is a second gray scale interval, comprises:
increasing the gamma voltage corresponding to the gray scale to be displayed;
and reducing the light emitting duration of at least one second subframe.
6. The hybrid driving method of a display according to claim 1, wherein driving the display to display according to the adjusted light emitting duration of each first subframe and/or the adjusted light emitting duration of each second subframe includes:
Correcting the gamma curve of the display according to the adjusted luminous time length of each first subframe and/or the luminous time length of each second subframe to obtain a corrected gamma curve;
and driving the display to display according to the corrected gamma curve.
7. A hybrid driving module for a display, wherein a frame for driving the display includes at least one first subframe and at least one second subframe, the first subframe is driven by a first driving mode, and the second subframe is driven by a second driving mode, the hybrid driving module comprising:
the to-be-displayed gray scale acquisition module is used for acquiring to-be-displayed gray scales input to the display;
the light-emitting duration adjustment module is electrically connected with the gray scale obtaining module to be displayed, and is configured to adjust the light-emitting duration of at least one first subframe and/or the light-emitting duration of at least one second subframe according to the gray scale to be displayed, and includes: acquiring a gray scale range of the display; dividing the gray scale range of the display into a first gray scale interval and a second gray scale interval, wherein the first gray scale interval corresponds to the first driving mode, and the second gray scale interval corresponds to the second driving mode; adjusting the light emitting duration of at least one first subframe and/or the light emitting duration of at least one second subframe according to the gray scale interval where the gray scale to be displayed is located, including: when the gray scale interval where the gray scale to be displayed is located is a first gray scale interval, adjusting the light emitting duration of at least one first subframe; when the gray scale interval where the gray scale to be displayed is located is a second gray scale interval, adjusting the light emitting duration of at least one second subframe; when the gray scale interval where the gray scale to be displayed is the first gray scale interval, adjusting the light emitting duration of at least one first subframe includes: acquiring a weight threshold corresponding to the first gray scale interval; adjusting the light-emitting duration of at least one first subframe according to the weight threshold;
The driving display module is electrically connected with the luminous time length adjusting module and is used for driving the display to display according to the adjusted luminous time length of each first subframe and/or the luminous time length of each second subframe.
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