CN118116337A - Display device, backlight brightness compensation method thereof and electronic equipment - Google Patents
Display device, backlight brightness compensation method thereof and electronic equipment Download PDFInfo
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- CN118116337A CN118116337A CN202410137278.7A CN202410137278A CN118116337A CN 118116337 A CN118116337 A CN 118116337A CN 202410137278 A CN202410137278 A CN 202410137278A CN 118116337 A CN118116337 A CN 118116337A
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/3406—Control of illumination source
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
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Abstract
The application provides a display device, a backlight brightness compensation method thereof and electronic equipment. The display device includes: the picture follower circuit is used for acquiring the rising edge and the falling edge of each frame of data enabling signal, outputting a first trigger signal when the rising edge and outputting a second trigger signal when the falling edge; the parameter selection circuit is used for outputting a first pulse parameter according to the first trigger signal and outputting a second pulse parameter according to the second trigger signal; the backlight driving signal generating circuit is used for responding to the first trigger signal and outputting a first backlight driving signal according to a first pulse parameter; and responding to the second trigger signal and outputting a second backlight driving signal according to the second pulse parameter; the first backlight driving signal is located between a rising edge and a falling edge of the data enable signal of the current frame, and the second backlight driving signal is located between a falling edge of the data enable signal of the current frame and a rising edge of the data enable signal of the next frame.
Description
Technical Field
The application relates to the technical field of display, in particular to a display device, a backlight brightness compensation method thereof and electronic equipment.
Background
Motion blur (motion blur), also known as motion blur, is an object that moves rapidly in a static scene or series of pictures (e.g., a movie or animation) causing a noticeable blurred drag trace. Since the above-described blurring phenomenon occurs only in an object moving during display, the phenomenon is called dynamic blurring. The main reason for the generation of the motion blur is that the moving object displayed by the display device is not continuously moving but is displayed frame by frame, each frame is statically maintained until the next frame appears, and the motion blur is generated when the frame rate is low.
In order to achieve the motion blur reduction (motion blur reduction, MBR), this can be achieved by raising the refresh frequency of the picture, but at high refresh frequencies the power consumption is increased, for which reason a free synchronization mode (Freesync Mode) is currently used, i.e. different refresh frequencies are used for different display requirements. However, in the free synchronous mode, when the MBR is used, the problem of different display brightness of pictures with different field frequencies is easy to occur, so that human eyes feel flickering.
Disclosure of Invention
Aiming at the defects of the prior art, the application provides a display device, a backlight brightness compensation method thereof and electronic equipment, which are used for solving the technical problems that the prior art is in a free synchronous mode and human eyes feel flickering when MBR is performed.
In order to achieve the above object, the technical solution provided by the embodiments of the present application is as follows:
In a first aspect, an embodiment of the present application provides a display device that displays in a free-synchronization mode, including:
a picture follower circuit configured to acquire a rising edge and a falling edge of each frame data enable signal, and to output a first trigger signal when the rising edge is acquired, and to output a second trigger signal when the falling edge is acquired;
a parameter selection circuit connected with the picture following circuit and configured to output a first pulse parameter according to the received first trigger signal and output a second pulse parameter according to the received second trigger signal;
A backlight driving signal generating circuit connected with the parameter selecting circuit and the picture following circuit respectively and configured to respond to the first trigger signal and output a first backlight driving signal to drive a backlight source of the display panel according to the first pulse parameter; and responding to the second trigger signal and outputting a second backlight driving signal according to the second pulse parameter to drive a backlight source of the display panel; wherein:
the first backlight driving signal is located in a first period between the rising edge and the falling edge of the data enable signal of the current frame, and the second backlight driving signal is located in a second period between the falling edge of the data enable signal of the current frame and the rising edge of the data enable signal of the next frame.
Optionally, the duty ratio of the first backlight driving signal in the first time period is equal to the duty ratio of the second backlight driving signal in the second time period, or the duty ratio difference value of the first backlight driving signal and the second backlight driving signal is within a preset range;
The duty ratio of the first backlight driving signal in the first period is equal for each frame.
Optionally, the display device further includes a delay circuit connected to the parameter selection circuit and the backlight driving signal generating circuit, respectively;
the parameter selection circuit is further configured to output a first delay parameter according to the received first trigger signal and to output a second delay parameter according to the received second trigger signal;
The delay circuit is configured to respond to the received first delay parameter, determine a current time point, delay a first time length based on the current time point and the first delay parameter and then output a first delay ending signal; and responding to the received second delay parameter, determining a current time point, delaying a second time length based on the current time point and the second delay parameter, and outputting a second delay ending signal;
the backlight driving signal generating circuit is further configured to respond to the first trigger signal and the first delay ending signal and output a first backlight driving signal according to the first pulse parameter; and responding to the second trigger signal and the second delay ending signal, and outputting a second backlight driving signal according to the second pulse parameter.
Optionally, the display device further includes a delay circuit and a reset circuit;
The delay circuit is respectively connected with the parameter selection circuit and the backlight driving signal generation circuit; the reset circuit is respectively connected with the picture following circuit, the delay circuit and the backlight driving signal generating circuit;
the parameter selection circuit is further configured to output a first delay parameter according to the received first trigger signal and to output a second delay parameter according to the received second trigger signal;
The reset circuit is configured to output a first reset signal to the delay circuit and the backlight driving signal generating circuit in response to the first trigger signal; and outputting a second reset signal to the delay circuit and the backlight driving signal generating circuit in response to the second trigger signal;
the delay circuit is configured to respond to the first reset signal to reset the current time point, delay a first time length based on the reset time point and the first delay parameter and then output a first delay ending signal; resetting the current time point in response to the second reset signal, and outputting a second delay ending signal after delaying a second time length based on the reset time point and the second delay parameter;
The backlight driving signal generating circuit is further configured to reset a first backlight driving signal output last time in response to the first reset signal, and output a current first backlight driving signal according to the first pulse parameter in response to the first trigger signal and the first delay end signal; and resetting the last output second backlight driving signal in response to the second reset signal, and outputting the current second backlight driving signal according to the second pulse parameter in response to the second trigger signal and the second delay ending signal.
Optionally, the frequency of the first backlight driving signal in the first period of time is smaller than the frequency of the second backlight driving signal in the second period of time.
In a second aspect, an embodiment of the present application provides an electronic apparatus, including a display device as in any one of the first aspects.
In a third aspect, an embodiment of the present application provides a backlight brightness compensation method for a display device, adapted to perform backlight brightness compensation on each frame in a free synchronization mode of the display device, where the backlight brightness compensation method includes:
Acquiring a rising edge and a falling edge of each frame of data enabling signal, outputting a first trigger signal when the rising edge is acquired, and outputting a second trigger signal when the falling edge is acquired;
Outputting a first pulse parameter according to the first trigger signal, and outputting a second pulse parameter according to the second trigger signal;
Responding to the first trigger signal and outputting a first backlight driving signal according to the first pulse parameter, wherein the first backlight driving signal is positioned in a first time period between the rising edge and the falling edge of the data enabling signal of the current frame;
And responding to the second trigger signal and outputting a second backlight driving signal according to the second pulse parameter, wherein the second backlight driving signal is positioned in a second time period between the falling edge of the data enabling signal of the current frame and the rising edge of the data enabling signal of the next frame.
Optionally, the backlight brightness compensation method further includes:
outputting a first delay parameter according to the first trigger signal, and outputting a second delay parameter according to the second trigger signal;
Responding to the first delay parameter, determining a current time point, delaying a first duration based on the current time point and the first delay parameter, and outputting a first delay ending signal; and responding to the second delay parameter, determining a current time point, delaying a second time length based on the current time point and the second delay parameter, and outputting a second delay ending signal;
Responding to the first trigger signal and the first delay ending signal, and outputting a first backlight driving signal according to the first pulse parameter; and responding to the second trigger signal and the second delay ending signal, and outputting a second backlight driving signal according to the second pulse parameter.
Optionally, the backlight brightness compensation method further includes:
Outputting a first reset signal in response to the first trigger signal, resetting the current time point according to the first reset signal, and resetting a first backlight driving signal output last time; and outputting a second reset signal in response to the second trigger signal, resetting the current time point according to the second reset signal, and resetting the last output second backlight driving signal;
Outputting a first delay ending signal after delaying a first duration based on the reset time point and the first delay parameter; and outputting a second delay ending signal after delaying a second time length based on the reset time point and the second delay parameter;
Responding to the first trigger signal and the first delay ending signal, and outputting a current first backlight driving signal according to the first pulse parameter; and responding to the second trigger signal and the second delay ending signal, and outputting a current second backlight driving signal according to the second pulse parameter.
Optionally, the pulse width of the pulse corresponding to the first pulse parameter is greater than the pulse width of the pulse corresponding to the second pulse parameter, so that the frequency of the first backlight driving signal is smaller than the frequency of the second backlight driving signal.
The technical scheme provided by the embodiment of the application has at least the following beneficial effects:
In the display device provided by the embodiment of the application, since the first trigger signal corresponds to the rising edge of the data enable signal, the second trigger signal corresponds to the falling edge of the data enable signal, and the backlight driving signal generating circuit responds to the first trigger signal and outputs the first backlight driving signal according to the first pulse parameter, and responds to the second trigger signal and outputs the second backlight driving signal according to the second pulse parameter, and the first backlight driving signal is positioned in the first time period between the rising edge and the falling edge of the data enable signal of the current frame, and the second backlight driving signal is positioned in the second time period between the falling edge of the data enable signal of the current frame and the rising edge of the data enable signal of the next frame, the display device of the embodiment of the application can compensate the backlight brightness in the blank period of the current frame and the vertical synchronous period of the next frame, namely the display device of the embodiment of the application can compensate the backlight brightness in all non-display periods, and further does not cause flicker in the backlight brightness; therefore, the average brightness of the display panel can be kept unchanged in the free synchronous mode, so that the human eyes cannot perceive brightness flicker.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic waveform diagram of a vertical synchronization signal, a data enable signal and a backlight control signal of a related art display device;
Fig. 2 is a block diagram of a display device according to an embodiment of the present application;
Fig. 3 is a schematic waveform diagram of a vertical synchronization signal, a data enable signal, a trigger signal and a backlight control signal of a display device according to an embodiment of the present application;
fig. 4 is a block diagram of another display device according to an embodiment of the present application;
fig. 5 is a schematic waveform diagram of a vertical synchronization signal, a data enable signal, a trigger signal and a backlight control signal of another display device according to an embodiment of the present application;
Fig. 6 is a flowchart of a method for compensating backlight brightness of a display device according to an embodiment of the present application.
Detailed Description
The present application is described in detail below, examples of embodiments of the application are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar components or components having the same or similar functions throughout. Further, if detailed description of the known technology is not necessary for the illustrated features of the present application, it will be omitted. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.
It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. The term "and/or" as used herein includes all or any element and all combination of one or more of the associated listed items.
The free synchronous mode means that the field frequency is adjusted according to the display image, specifically, the field frequency is also called vertical scanning frequency, and means the number of screen refreshing times per second, the unit is Hz, that is, the refreshing frequency of each frame in the free synchronous mode is adjusted according to the specific display image of the frame. However, the free synchronous mode is prone to the problem of different display brightness of pictures with different field frequencies, and human eyes feel flickering.
Specifically, fig. 1 shows a schematic timing diagram of three consecutive frames with different field frequencies in the prior art, where the consecutive three frames are an nth frame, an n+1st frame, and an n+2nd frame, the timing corresponding to the Vsync in fig. 1 represents the timing of the vertical synchronization signal Vsync, the timing corresponding to the DE represents the timing of the data enable signal DE, and the timing corresponding to the BL represents the timing of the backlight control signal BL; in the three consecutive frames shown in fig. 1, the total duration of each frame is not the same, but the backlight on duration of each frame is the same, so that the backlight amount per unit time of each frame is different, and the human eye perceives flicker.
As shown in fig. 1, each frame includes three periods of a vertical synchronization period, a data enable period, and a blank (blanking) period, wherein a period in which the vertical synchronization signal Vsync is high and a period in which the data enable signal DE is low is a vertical synchronization period; the period in which the vertical synchronization signal Vsync is low and the data enable signal DE is high is a data enable period; the periods in which the vertical synchronization signal Vsync and the data enable signal DE are both low level are blank periods, and the display panel displays a picture in the data enable period of each frame, but does not display a picture in the vertical synchronization period and the blank period of each frame. As can be seen from fig. 1, the duration of the data enable period in each frame is the same, the duration of the vertical synchronization period in each frame is the same, and the duration of the blank period in each frame is different, and thus the total duration of each frame is different.
As shown in fig. 1, the backlight on-time is the same for each frame, although the total time is different for each frame, so that the amount of backlight per unit time is different for each frame, and the human eye perceives flickering.
In view of the above technical problems in the prior art, the present application provides a display device and a backlight brightness compensation method thereof, which can ensure that the average brightness of a display panel is kept unchanged in a free synchronization mode by performing brightness compensation on the backlight brightness in a blank period of a current frame and a vertical synchronization period of a next frame, so that human eyes cannot perceive brightness flicker.
The following describes the technical scheme of the present application and how the technical scheme of the present application solves the above technical problems in detail with specific embodiments. The following embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
As shown in fig. 2, an embodiment of the present application provides a display device that displays in a free-synchronization mode, the display device including: a video processing circuit 11, a picture following circuit 12, a parameter selection circuit 13, a backlight driving signal generation circuit 14, and a backlight 15; the video processing circuit 11 may be, for example, a scaler (scaler) circuit, but may be other video signal processing circuits. The video processing circuit 11 may transmit the clock signal, the video synchronization information, and the video data to the display panel driving circuit to control the display panel driving circuit to drive the display panel; the video synchronization information may include a vertical synchronization signal, a horizontal synchronization signal, a data enable signal, and other synchronization signals, and the specific arrangement of the video processing circuit 11 is similar to that of the prior art, and will not be repeated here. The backlight 15 in the embodiment of the present application may be an LED (LIGHT EMITTING Diode) backlight, and the specific arrangement manner of the backlight 15 is similar to that of the prior art, and will not be repeated here.
As shown in fig. 2 and 3, the picture follower circuit 12 is connected to the video processing circuit 11, and is configured to receive video synchronization information output from the video processing circuit 11, acquire a rising edge and a falling edge of each frame data enable signal DE according to the video synchronization information, and output a first trigger signal TA when the rising edge is acquired, and output a second trigger signal TB when the falling edge is acquired; the parameter selection circuit 13 is connected to the picture follower circuit 12 and is configured to output a first pulse parameter according to the received first trigger signal TA and a second pulse parameter according to the received second trigger signal TB; the backlight driving signal generating circuit 14 is respectively connected with the parameter selecting circuit 13, the picture following circuit 12 and the backlight 15, and is configured to respond to the first trigger signal TA and output a first backlight driving signal BL1 according to a first pulse parameter to drive the backlight 15 of the display panel; and, responding to the second trigger signal TB, and outputting a second backlight driving signal BL2 according to the second pulse parameter to drive the backlight 15 of the display panel; wherein: the first backlight driving signal BL1 is located at a first period T1 between a rising edge and a falling edge of the data enable signal of the current frame, and the second backlight driving signal BL2 is located at a second period T2 between a falling edge of the data enable signal of the current frame and a rising edge of the data enable signal of the next frame.
In the display device provided by the embodiment of the application, since the first trigger signal TA corresponds to the rising edge of the data enable signal, the second trigger signal TB corresponds to the falling edge of the data enable signal, and the backlight driving signal generating circuit 14 responds to the first trigger signal TA and outputs the first backlight driving signal BL1 according to the first pulse parameter, and responds to the second trigger signal TB and outputs the second backlight driving signal BL2 according to the second pulse parameter, and the first backlight driving signal BL1 is located in the first period between the rising edge and the falling edge of the data enable signal of the current frame, and the second backlight driving signal BL2 is located in the second period between the falling edge of the data enable signal of the current frame and the rising edge of the data enable signal of the next frame, the display device of the embodiment of the application can compensate the backlight brightness in the period of the current frame and the blank period of the next frame, that is, the display device of the embodiment of the application can compensate the backlight brightness in all the non-display periods, and does not cause backlight flicker; therefore, the average brightness of the display panel can be kept unchanged in the free synchronous mode, so that the human eyes cannot perceive brightness flicker.
In an alternative embodiment, the duty ratio of the first backlight driving signal BL1 in the first period T1 is equal to the duty ratio of the second backlight driving signal BL2 in the second period T2, or the difference between the duty ratio of the first backlight driving signal BL1 in the first period T1 and the duty ratio of the second backlight driving signal BL2 in the second period T2 is within a preset range; the duty ratio of the first backlight driving signal BL1 in the first period T1 is equal for each frame. Because the duty ratio of the first backlight driving signal BL1 in the first time period is equal to the duty ratio of the second backlight driving signal BL2 in the second time period or the duty ratio difference value of the first and second backlight driving signals is within a preset range, the average brightness of the display panel in the free synchronous mode can be further ensured to be unchanged, and the human eyes cannot perceive brightness flicker.
It should be noted that, the difference between the duty ratio of the first backlight driving signal BL1 in the first period T1 and the duty ratio of the second backlight driving signal BL2 in the second period T2 is within a preset range, and the setting of the preset range only needs to ensure that the human eyes cannot perceive the brightness flicker.
Note that the equal duty ratio of the first backlight driving signal BL1 in the first period T1 of each frame means that the duty ratio of the first backlight driving signal BL1 in the first period T1 of each frame is approximately equal, for example: the values of the respective duty cycles are not equal, but the difference between the value of the maximum duty cycle and the value of the minimum duty cycle is within a preset range.
It should be noted that, in the embodiment of the present application, the timing of the first trigger signal TA is the same as the timing of the rising edge of the data enable signal DE, that is, as shown in fig. 3, the first trigger signal TA is at a high level at the time of the rising edge of the data enable signal DE, the duration of the high level is shorter, and the trigger action is performed, and since the duration of the first trigger signal TA is shorter, only one vertical high level line is shown in fig. 3; likewise, the timing of the second trigger signal TB is the same as the timing of the falling edge of the data enable signal DE, that is, as shown in fig. 3, the second trigger signal TB is at a high level at the time of the falling edge of the data enable signal DE, and the high level has a short duration and plays a role in triggering, and since the duration of the second trigger signal TB is short, only one vertical high level line is shown in fig. 3.
In a specific embodiment, as shown in fig. 3, the frequency of the first backlight driving signal BL1 in the first period of time is smaller than the frequency of the second backlight driving signal BL2 in the second period of time in the embodiment of the present application. As shown in fig. 3, since the generation time of the first trigger signal TA is not constant, it may cause the square wave of the second backlight driving signal BL2 to be truncated (e.g., the square wave of the second backlight driving signal BL2 may be truncated by the first trigger signal TA generated in the n+2th frame in fig. 3), and thus a complete PWM (Pulse Width Modulation ) square wave cannot be ensured, so that the flicker of the picture is caused, and in order to avoid this problem, it is necessary to ensure that the square wave frequency of the second backlight driving signal BL2 is as high as possible.
It should be noted that, the frequency of the first backlight driving signal BL1 is determined by the first pulse parameter, and the frequency of the second backlight driving signal BL2 is determined by the second pulse parameter; specifically, the parameter selection circuit 13 may include a storage module and a transceiver module, where the storage module stores the first pulse parameter and the second pulse parameter in advance, and when the transceiver module receives the first trigger signal TA, the transceiver module outputs the first pulse parameter stored in advance in the storage module, and when the transceiver module receives the second trigger signal TB, the transceiver module outputs the second pulse parameter stored in advance in the storage module; in specific implementation, the setting of the first pulse parameter may refer to the setting of the backlight parameter in the prior art, and the setting of the second pulse parameter may refer to the setting of the first pulse parameter, so long as the frequency of the first backlight driving signal BL1 is ensured to be smaller than the frequency of the second backlight driving signal BL2, and in order to further avoid flicker of the screen, the setting of the second pulse parameter needs to be such that the higher the frequency of the generated second backlight driving signal BL2 is, the better.
It should be noted that, as shown in fig. 3, the backlight driving signal generating circuit 14 in the embodiment of the present application may include a superimposing circuit, where the superimposing circuit may superimpose the first backlight driving signal BL1 and the second backlight driving signal BL2 to form the backlight driving signal BL, and then output the backlight driving signal BL to the backlight 15 to drive the backlight 15 to emit light, specifically, when the backlight driving signal BL is a high level signal, the backlight 15 emits light, and when the backlight driving signal BL is a low level signal, the backlight 15 does not emit light.
In an alternative embodiment, as shown in fig. 4 and 5, the display device of the embodiment of the present application further includes a delay circuit 16, where the delay circuit 16 is connected to the parameter selection circuit 13 and the backlight driving signal generation circuit 14, respectively; the parameter selection circuit 13 is further configured to output a first delay parameter to the delay circuit 16 according to the received first trigger signal TA, and to output a second delay parameter to the delay circuit 16 according to the received second trigger signal TB; the delay circuit 16 is configured to determine a current point in time in response to the received first delay parameter and to output a first delay end signal after delaying the first duration based on the current point in time and the first delay parameter; and responding to the received second delay parameter, determining a current time point, delaying a second time length based on the current time point and the second delay parameter, and outputting a second delay ending signal; the backlight driving signal generating circuit 14 is further configured to respond to the first trigger signal TA and the first delay end signal and output a first backlight driving signal BL1 according to the first pulse parameter; and outputting a second backlight driving signal BL2 according to the second pulse parameter in response to the second trigger signal TB and the second delay ending signal.
Note that the backlight driving signal generating circuit 14 outputs the first backlight driving signal BL1 in response to the first trigger signal TA and the first delay end signal, which means that: only when the backlight driving signal generating circuit 14 receives the first trigger signal TA and the first delay end signal at the same time, as shown in fig. 5, the first backlight driving signal BL1 has a delay of a first duration with respect to the first trigger signal TA, and the delay circuit is configured to enable the on position of the first backlight driving signal BL1 to be customized, so that the backlight on interval is more uniform according to the effect configuration, and the flicker phenomenon is less likely to occur.
Note that the backlight driving signal generating circuit 14 outputs the second backlight driving signal BL2 in response to the second trigger signal TB and the second delay end signal, which means that: only when the backlight driving signal generating circuit 14 receives the second trigger signal TB and the second delay end signal at the same time, the second backlight driving signal BL2 has a delay of a second duration with respect to the second trigger signal TB, as shown in fig. 5, and the delay circuit is configured to enable the second backlight driving signal BL2 to have more adjustment space, for example, to be adjustable according to effects.
As shown in fig. 5, since the generation time of the first trigger signal TA is not constant, it may cause the square wave of the second backlight driving signal BL2 to be truncated (e.g., the square wave of the first second backlight driving signal BL2 may be truncated by the first trigger signal TA generated in the n+1th frame in fig. 5), and thus a complete PWM (Pulse Width Modulation ) square wave cannot be ensured, so that the flicker of the picture is caused, and in order to avoid this problem, it is necessary to ensure that the square wave frequency of the second backlight driving signal BL2 is as high as possible.
It should be noted that, as shown in fig. 5, the backlight driving signal generating circuit 14 in the embodiment of the present application may include a superimposing circuit, where the superimposing circuit may superimpose the first backlight driving signal BL1 and the second backlight driving signal BL2 to form the backlight driving signal BL, and then output the backlight driving signal BL to the backlight 15 to drive the backlight 15 to emit light, specifically, when the backlight driving signal BL is a high level signal, the backlight 15 emits light, and when the backlight driving signal BL is a low level signal, the backlight 15 does not emit light.
In the embodiment of the present application, compared with the backlight driving signal BL shown in fig. 3, the frequency of the first backlight driving signal BL1 is the same and the frequency of the second backlight driving signal BL2 is the same, and the difference is that: the first backlight driving signal BL1 generated as shown in fig. 5 has a delay of a first duration with respect to the first trigger signal TA, whereas the first backlight driving signal BL1 generated as shown in fig. 3 has no delay with respect to the first trigger signal TA; the second backlight driving signal BL2 generated as shown in fig. 5 has a delay of a second duration with respect to the second trigger signal TB, whereas the second backlight driving signal BL2 generated as shown in fig. 3 has no delay with respect to the second trigger signal TB.
Specifically, the parameter selection circuit 13 may further include a storage module that stores the first delay parameter and the second delay parameter in advance, and when the transceiver module receives the first trigger signal TA, outputs the first delay parameter stored in advance in the storage module, and when the transceiver module receives the second trigger signal TB, outputs the second delay parameter stored in advance in the storage module. In a specific implementation, in the embodiment of the present application, the first duration corresponding to the first delay parameter and the second duration corresponding to the second delay parameter are equal, and of course, in an actual design, the durations of the first duration and the second duration may also be unequal, and any one of the durations of the first duration and the second duration may also be zero, which is not limited in the embodiment of the present application.
As shown in fig. 5, in one embodiment, the duty ratio of the first backlight driving signal BL1 in the first period between the rising edge and the falling edge of the data enable signal of the current frame is equal to or close to (i.e., the duty ratio difference between the two is within a certain threshold range) the duty ratio of the second backlight driving signal BL2 in the second period between the falling edge of the data enable signal of the current frame and the rising edge of the data enable signal of the next frame; of course, in another embodiment, the duty ratio of the first backlight driving signal BL1 in the period between the rising edge of the data enable signal of the current frame and the timing when the falling edge is delayed by the second period is equal to or close to the duty ratio in the period between the timing when the falling edge of the data enable signal of the previous frame is delayed by the second period and the rising edge of the data enable signal of the next frame (i.e., the duty ratio difference between them is within a certain threshold range).
In another alternative embodiment, as shown in fig. 4 and 5, the display device of the embodiment of the present application further includes a delay circuit 16 and a reset circuit 17; the delay circuit 16 is respectively connected with the parameter selection circuit 13 and the backlight driving signal generation circuit 14; the reset circuit 17 is connected with the picture following circuit 12, the delay circuit 16 and the backlight driving signal generating circuit 14 respectively; the reset circuit 17 is configured to output a first reset signal to the delay circuit 16 and the backlight driving signal generation circuit 14 in response to the first trigger signal TA; and, in response to the second trigger signal TB, outputs a second reset signal to the delay circuit 16 and the backlight driving signal generating circuit 14; the parameter selection circuit 13 is further configured to output a first delay parameter to the delay circuit 16 according to the received first trigger signal TA, and to output a second delay parameter to the delay circuit 16 according to the received second trigger signal TB; the delay circuit 16 is configured to reset the current time point in response to the first reset signal, and to delay the first time period based on the reset time point and the first delay parameter and then output a first delay end signal; resetting the current time point in response to the second reset signal, and delaying the second time length based on the reset time point and the second delay parameter to output a second delay ending signal; the backlight driving signal generating circuit 14 is further configured to reset the last outputted first backlight driving signal in response to the first reset signal, and output the current first backlight driving signal according to the first pulse parameter in response to the first trigger signal TA and the first delay end signal; and resetting the last output second backlight driving signal in response to the second reset signal TB, and outputting the current second backlight driving signal according to the second pulse parameter in response to the second trigger signal TB and the second delay ending signal.
It should be noted that, in the embodiment of the present application, the delay circuit 16 resets the current time point in response to the first reset signal, so that when different display frames are delayed, the delay can be performed with the same time starting point as the reference, the current time point does not need to be determined, the delay can be realized faster, and the setting mode of the delay circuit is simpler.
It should be noted that, in the embodiment of the present application, the backlight driving signal generating circuit 14 resets the first backlight driving signal output last time in response to the first reset signal (i.e., the first backlight driving signal encounters the first reset signal interrupt waveform generation), and resets the second backlight driving signal output last time in response to the second reset signal TB (i.e., the second backlight driving signal encounters the second reset signal interrupt waveform generation), so that it is possible to avoid the current first backlight driving signal output from being affected by the first backlight driving signal output last time and to avoid the current second backlight driving signal output from being affected by the second backlight driving signal output last time.
Based on the same inventive concept, the embodiment of the present application provides an electronic device, including the display device provided in any of the embodiments, and since the electronic device includes the display device, the electronic device has the same beneficial effects as the display device, and will not be described herein.
Specifically, the electronic device includes a smart phone, a computer, a tablet computer, an artificial intelligence device, a wearable device, a mobile power supply, or the like.
Based on the same inventive concept, an embodiment of the present application provides a backlight brightness compensation method of the above display device, which is suitable for performing backlight brightness compensation on each frame in a free synchronization mode of the display device, as shown in fig. 6, where the backlight brightness compensation method includes:
S101, acquiring a rising edge and a falling edge of each frame of data enabling signal, outputting a first trigger signal when the rising edge is acquired, and outputting a second trigger signal when the falling edge is acquired;
s102, outputting a first pulse parameter according to a first trigger signal, and outputting a second pulse parameter according to a second trigger signal;
S103, responding to a first trigger signal and outputting a first backlight driving signal according to a first pulse parameter, wherein the first backlight driving signal is positioned in a first time period between the rising edge and the falling edge of a data enabling signal of a current frame;
s104, responding to the second trigger signal and outputting a second backlight driving signal according to a second pulse parameter, wherein the second backlight driving signal is positioned in a second time period between the falling edge of the data enabling signal of the current frame and the rising edge of the data enabling signal of the next frame.
In a specific embodiment, the pulse width of the pulse corresponding to the first pulse parameter is greater than the pulse width of the pulse corresponding to the second pulse parameter, so that the frequency of the first backlight driving signal is smaller than the frequency of the second backlight driving signal.
In an alternative embodiment, the method of the present application obtains a rising edge and a falling edge of a data enable signal of each frame, including: acquiring video signals output by a video processing circuit, and determining a data enabling signal of each frame from each video signal; and according to the determined data enabling signals of each frame, if the data enabling signals are from none to none, determining the rising edge of the data enabling signals, and if the data enabling signals are from none to none, determining the falling edge of the data enabling signals. According to the embodiment of the application, the rising edge and the falling edge of the data enabling signal are determined, so that the Vsync signal is not needed to be seen, and the backlight brightness can be better compensated.
In an alternative embodiment, the backlight brightness compensation method further includes: outputting a first delay parameter according to the first trigger signal, and outputting a second delay parameter according to the second trigger signal; responding to the first delay parameter, determining a current time point, delaying a first duration based on the current time point and the first delay parameter, and outputting a first delay ending signal; and responding to the second delay parameter, determining a current time point, delaying a second time length based on the current time point and the second delay parameter, and outputting a second delay ending signal; responding to the first trigger signal and the first delay ending signal, and outputting a first backlight driving signal according to a first pulse parameter; and responding to the second trigger signal and the second delay ending signal, and outputting a second backlight driving signal according to the second pulse parameter.
In an alternative embodiment, the backlight brightness compensation method further includes: outputting a first reset signal in response to the first trigger signal, resetting the current time point according to the first reset signal, and resetting the last output first backlight driving signal; and outputting a second reset signal in response to the second trigger signal, resetting the current time point according to the second reset signal, and resetting the second backlight driving signal output last time; outputting a first delay ending signal after delaying a first duration based on the reset time point and the first delay parameter; and outputting a second delay ending signal after delaying the second time length based on the reset time point and the second delay parameter; responding to the first trigger signal and the first delay ending signal, and outputting a current first backlight driving signal according to a first pulse parameter; and outputting a current second backlight driving signal according to the second pulse parameter in response to the second trigger signal and the second delay end signal.
In summary, by applying the embodiment of the application, at least the following beneficial effects can be achieved:
In the display device provided by the embodiment of the application, since the first trigger signal TA corresponds to the rising edge of the data enable signal, the second trigger signal TB corresponds to the falling edge of the data enable signal, and the backlight driving signal generating circuit 14 responds to the first trigger signal TA and outputs the first backlight driving signal BL1 according to the first pulse parameter, and responds to the second trigger signal TB and outputs the second backlight driving signal BL2 according to the second pulse parameter, and the first backlight driving signal BL1 is located in the first period between the rising edge and the falling edge of the data enable signal of the current frame, and the second backlight driving signal BL2 is located in the second period between the falling edge of the data enable signal of the current frame and the rising edge of the data enable signal of the next frame, the display device of the embodiment of the application can compensate the backlight brightness in the period of the current frame and the blank period of the next frame, that is, the display device of the embodiment of the application can compensate the backlight brightness in all the non-display periods, and does not cause backlight flicker; therefore, the average brightness of the display panel can be kept unchanged in the free synchronous mode, so that the human eyes cannot perceive brightness flicker.
Those of skill in the art will appreciate that the various operations, methods, steps in the flow, acts, schemes, and alternatives discussed in the present application may be alternated, altered, combined, or eliminated. Further, other steps, means, or steps in a process having various operations, methods, or procedures discussed herein may be alternated, altered, rearranged, disassembled, combined, or eliminated. Further, steps, measures, schemes in the prior art with various operations, methods, flows disclosed in the present application may also be alternated, altered, rearranged, decomposed, combined, or deleted.
In the description of the present application, directions or positional relationships indicated by words such as "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., are based on exemplary directions or positional relationships shown in the drawings, are for convenience of description or simplification of describing embodiments of the present application, and do not indicate or imply that the devices or components 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.
The terms "first," "second," and the like, 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, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
The foregoing is only a partial embodiment of the present application, and it should be noted that it will be apparent to those skilled in the art that modifications and adaptations can be made without departing from the principles of the present application, and such modifications and adaptations are intended to be comprehended within the scope of the present application.
Claims (10)
1. A display device that displays in a free-sync mode, the display device comprising:
a picture follower circuit configured to acquire a rising edge and a falling edge of each frame data enable signal, and to output a first trigger signal when the rising edge is acquired, and to output a second trigger signal when the falling edge is acquired;
a parameter selection circuit connected with the picture following circuit and configured to output a first pulse parameter according to the received first trigger signal and output a second pulse parameter according to the received second trigger signal;
A backlight driving signal generating circuit connected with the parameter selecting circuit and the picture following circuit respectively and configured to respond to the first trigger signal and output a first backlight driving signal to drive a backlight source of the display panel according to the first pulse parameter; and responding to the second trigger signal and outputting a second backlight driving signal according to the second pulse parameter to drive a backlight source of the display panel; wherein:
the first backlight driving signal is located in a first period between the rising edge and the falling edge of the data enable signal of the current frame, and the second backlight driving signal is located in a second period between the falling edge of the data enable signal of the current frame and the rising edge of the data enable signal of the next frame.
2. The display device according to claim 1, wherein a duty ratio of the first backlight driving signal in the first period is equal to a duty ratio of the second backlight driving signal in the second period, or a duty ratio difference of the first and second backlight driving signals is within a preset range;
The duty ratio of the first backlight driving signal in the first period is equal for each frame.
3. The display device according to claim 1, further comprising a delay circuit connected to the parameter selection circuit and the backlight driving signal generation circuit, respectively;
the parameter selection circuit is further configured to output a first delay parameter according to the received first trigger signal and to output a second delay parameter according to the received second trigger signal;
The delay circuit is configured to respond to the received first delay parameter, determine a current time point, delay a first time length based on the current time point and the first delay parameter and then output a first delay ending signal; and responding to the received second delay parameter, determining a current time point, delaying a second time length based on the current time point and the second delay parameter, and outputting a second delay ending signal;
the backlight driving signal generating circuit is further configured to respond to the first trigger signal and the first delay ending signal and output a first backlight driving signal according to the first pulse parameter; and responding to the second trigger signal and the second delay ending signal, and outputting a second backlight driving signal according to the second pulse parameter.
4. The display device according to claim 1, further comprising a delay circuit and a reset circuit;
The delay circuit is respectively connected with the parameter selection circuit and the backlight driving signal generation circuit; the reset circuit is respectively connected with the picture following circuit, the delay circuit and the backlight driving signal generating circuit;
the parameter selection circuit is further configured to output a first delay parameter according to the received first trigger signal and to output a second delay parameter according to the received second trigger signal;
The reset circuit is configured to output a first reset signal to the delay circuit and the backlight driving signal generating circuit in response to the first trigger signal; and outputting a second reset signal to the delay circuit and the backlight driving signal generating circuit in response to the second trigger signal;
the delay circuit is configured to respond to the first reset signal to reset the current time point, delay a first time length based on the reset time point and the first delay parameter and then output a first delay ending signal; resetting the current time point in response to the second reset signal, and outputting a second delay ending signal after delaying a second time length based on the reset time point and the second delay parameter;
The backlight driving signal generating circuit is further configured to reset a first backlight driving signal output last time in response to the first reset signal, and output a current first backlight driving signal according to the first pulse parameter in response to the first trigger signal and the first delay end signal; and resetting the last output second backlight driving signal in response to the second reset signal, and outputting the current second backlight driving signal according to the second pulse parameter in response to the second trigger signal and the second delay ending signal.
5. The display device according to any one of claims 1 to 4, wherein a frequency of the first backlight driving signal in the first period is smaller than a frequency of the second backlight driving signal in the second period.
6. An electronic device comprising the display device according to any one of claims 1 to 5.
7. A backlight brightness compensation method for a display device, adapted to perform backlight brightness compensation on each frame in a free synchronization mode of the display device, comprising:
Acquiring a rising edge and a falling edge of each frame of data enabling signal, outputting a first trigger signal when the rising edge is acquired, and outputting a second trigger signal when the falling edge is acquired;
Outputting a first pulse parameter according to the first trigger signal, and outputting a second pulse parameter according to the second trigger signal;
Responding to the first trigger signal and outputting a first backlight driving signal according to the first pulse parameter, wherein the first backlight driving signal is positioned in a first time period between the rising edge and the falling edge of the data enabling signal of the current frame;
And responding to the second trigger signal and outputting a second backlight driving signal according to the second pulse parameter, wherein the second backlight driving signal is positioned in a second time period between the falling edge of the data enabling signal of the current frame and the rising edge of the data enabling signal of the next frame.
8. The backlight brightness compensation method of claim 7, further comprising:
outputting a first delay parameter according to the first trigger signal, and outputting a second delay parameter according to the second trigger signal;
Responding to the first delay parameter, determining a current time point, delaying a first duration based on the current time point and the first delay parameter, and outputting a first delay ending signal; and responding to the second delay parameter, determining a current time point, delaying a second time length based on the current time point and the second delay parameter, and outputting a second delay ending signal;
Responding to the first trigger signal and the first delay ending signal, and outputting a first backlight driving signal according to the first pulse parameter; and responding to the second trigger signal and the second delay ending signal, and outputting a second backlight driving signal according to the second pulse parameter.
9. The backlight brightness compensation method of claim 7, further comprising:
Outputting a first reset signal in response to the first trigger signal, resetting the current time point according to the first reset signal, and resetting a first backlight driving signal output last time; and outputting a second reset signal in response to the second trigger signal, resetting the current time point according to the second reset signal, and resetting the last output second backlight driving signal;
Outputting a first delay ending signal after delaying a first duration based on the reset time point and the first delay parameter; and outputting a second delay ending signal after delaying a second time length based on the reset time point and the second delay parameter;
Responding to the first trigger signal and the first delay ending signal, and outputting a current first backlight driving signal according to the first pulse parameter; and responding to the second trigger signal and the second delay ending signal, and outputting a current second backlight driving signal according to the second pulse parameter.
10. The backlight brightness compensation method according to claim 7, wherein the pulse width of the pulse corresponding to the first pulse parameter is larger than the pulse width of the pulse corresponding to the second pulse parameter, so that the frequency of the first backlight driving signal is smaller than the frequency of the second backlight driving signal.
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