CN111599296B - Dimming method and device of display screen - Google Patents
Dimming method and device of display screen Download PDFInfo
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- CN111599296B CN111599296B CN202010488853.XA CN202010488853A CN111599296B CN 111599296 B CN111599296 B CN 111599296B CN 202010488853 A CN202010488853 A CN 202010488853A CN 111599296 B CN111599296 B CN 111599296B
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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Abstract
The application provides a dimming method and device of a display screen, and relates to the technical field of display. The dimming method of the display screen comprises the following steps: acquiring a brightness grade parameter value which is expected to be adjusted by the display screen, wherein the brightness grade parameter value has a corresponding relation with the display brightness of the display screen; and under the condition that the brightness level parameter value is lower than the black insertion brightness threshold value, dimming the display screen by utilizing a first dimming mode, wherein in the first dimming mode, the number of pulses of a light-emitting control input signal of the display screen in one frame gradually changes according to the brightness level parameter value in a descending order, and the number of the pulses is in negative correlation with the brightness level parameter value. The technical scheme of the application can be utilized to improve the transition effect of brightness adjustment.
Description
Technical Field
The application belongs to the technical field of display, and particularly relates to a dimming method and device of a display screen.
Background
Under different ambient brightness, human eyes have different adaptability to the brightness of the display screen. The display screen can automatically adjust the light by utilizing the photosensitive assembly so as to adjust the display brightness. Or the display screen performs dimming according to a manual adjustment instruction of a user so as to adjust the display brightness of the display screen.
At present, the display brightness of the display screen can be adjusted by adopting a direct current dimming mode. However, when the display brightness is low, the Direct Current (DC) dimming may generate significant Mura, which affects the display effect. In order to reduce or even avoid Mura in the brightness adjustment process, Pulse Width Modulation (PWM) dimming may be used to adjust the brightness of the display screen when the display brightness is low. However, when the DC dimming mode is switched to the PWM dimming mode, the display brightness of the display panel is significantly inverted, so that the transition effect of brightness adjustment is poor.
Disclosure of Invention
The embodiment of the application provides a dimming method and device of a display screen, which can improve the transition effect of brightness adjustment.
In a first aspect, an embodiment of the present application provides a dimming method for a display screen, including: acquiring a brightness grade parameter value which is expected to be adjusted by the display screen, wherein the brightness grade parameter value has a corresponding relation with the display brightness of the display screen; and under the condition that the brightness level parameter value is lower than the black insertion brightness threshold value, dimming the display screen by utilizing a first dimming mode, wherein in the first dimming mode, the number of pulses of a light-emitting control input signal of the display screen in one frame gradually changes according to the brightness level parameter value in a descending order, and the number of the pulses is in negative correlation with the brightness level parameter value.
According to the first aspect of the embodiments of the present application, in the first dimming mode, the number of pulses of the light emission control input signal in one frame is sequentially and uniformly increased to N according to the value of the brightness level parameter, where N is a target value of the number of pulses of the light emission control input signal in one frame in the first dimming mode.
According to the first aspect of the embodiments of the present application, the method for dimming a display screen further includes: and in the case that the brightness level parameter value is higher than or equal to the black insertion brightness threshold value, dimming the display screen by using a second dimming mode, wherein in the second dimming mode, the number of pulses of the light-emitting control input signal in one frame is 1.
According to the first aspect of the embodiments of the present application, the width of the first pulse of the light emission control input signal in one frame in the first dimming mode is the same as the width of the pulse of the light emission control input signal in one frame in the second dimming mode.
According to the first aspect of the embodiments of the present application, in the first dimming mode, the width of at least part of the pulses of the light emission control input signal in one frame gradually changes in descending order according to the brightness level parameter value, and the width of the pulses has a negative correlation with the brightness level parameter value, wherein the width of the pulses of the light emission control input signal in one frame in the first dimming mode is less than or equal to the width of the pulses of the light emission control input signal in one frame in the second dimming mode.
In a second aspect, an embodiment of the present application provides a dimming device for a display screen, including: the parameter acquisition module is used for acquiring a brightness grade parameter value which is expected to be adjusted by the display screen, and the brightness grade parameter value has a corresponding relation with the display brightness of the display screen; and the dimming module is used for dimming the display screen by utilizing a first dimming mode under the condition that the brightness level parameter value is lower than the black insertion brightness threshold value, wherein in the first dimming mode, the number of pulses of the light-emitting control input signal of the display screen in one frame gradually changes in a descending order according to the brightness level parameter value, and the number of the pulses is in negative correlation with the brightness level parameter value.
According to the first aspect of the embodiments of the present application, in the first dimming mode, the number of pulses of the light emission control input signal in one frame is sequentially and uniformly increased to N in descending order according to the brightness level parameter value, where N is a target value of the number of pulses of the light emission control input signal in one frame in the first dimming mode.
According to a first aspect of embodiments of the present application, the dimming module is further configured to:
and in the case that the brightness level parameter value is higher than or equal to the black insertion brightness threshold value, dimming the display screen by using a second dimming mode, wherein in the second dimming mode, the number of pulses of the light-emitting control input signal in one frame is 1.
According to the first aspect of the embodiments of the present application, the width of the first pulse of the light emission control input signal in one frame in the first dimming mode is the same as the width of the pulse of the light emission control input signal in one frame in the second dimming mode.
According to the first aspect of the embodiments of the present application, in the first dimming mode, the width of at least part of the pulses of the light emission control input signal in one frame gradually changes in descending order according to the brightness level parameter value, and the width of the pulses has a negative correlation with the brightness level parameter value, wherein the width of the pulses of the light emission control input signal in one frame in the first dimming mode is less than or equal to the width of the pulses of the light emission control input signal in one frame in the second dimming mode.
The embodiment of the application provides a dimming method and device for a display screen, and the display screen is dimmed by using a first dimming mode under the condition that a brightness level parameter value is lower than a black insertion brightness threshold value. In the first mode, the number of pulses of the light-emitting control input signal of the display screen in one frame gradually changes in descending order according to the brightness level parameter value, and the number of pulses is in negative correlation with the brightness level parameter value. The number of pulses of the light emission control input signal in one frame may be gradually increased in case the value of the brightness level parameter is decreased. Therefore, sudden change of the light-emitting control input signal caused by switching the dimming mode when the brightness level parameter value is lower than the black insertion brightness threshold value is avoided, severe change of the time sequence corresponding relation of the light-emitting control input signal and the first clock signal and the second clock signal is avoided, increase of the light-emitting time of the light-emitting control signal in a frame for controlling the pixel unit of the display screen to emit light is reduced or even eliminated, obvious inversion of the display brightness of the display screen is reduced or even eliminated, and the transition effect of brightness adjustment is improved.
Drawings
The present application may be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings. Wherein like or similar reference numerals refer to like or similar features.
Fig. 1 is a schematic structural diagram of a light-emitting control signal circuit in an embodiment of the present application.
FIG. 2 is a diagram illustrating a relationship between display brightness and an output value of a 51 register according to an embodiment of the present application;
fig. 3 is a flowchart of a dimming method for a display screen according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of an example of a light emission control input signal switched from the DC dimming mode to the first dimming mode in the embodiment of the present application;
fig. 5 is a schematic diagram of an example of a light emission control input signal for switching from the DC dimming mode to the conventional PWM dimming mode in the embodiment of the present application;
FIG. 6 is a flowchart illustrating a method for dimming a display screen according to another embodiment of the present disclosure;
fig. 7 is a schematic diagram of another example of a light emission control input signal switched from the DC dimming mode to the first dimming mode in the embodiment of the present application;
fig. 8 is a schematic diagram of still another example of a lighting control input signal for switching from the DC dimming mode to the first dimming mode in the embodiment of the present application;
fig. 9 is a schematic structural diagram of a dimming device of a display screen according to an embodiment of the present application.
Detailed Description
Features of various aspects and exemplary embodiments of the present application will be described in detail below, and in order to make objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
It will be understood that when a layer, region or layer is referred to as being "on" or "over" another layer, region or layer in describing the structure of the component, it can be directly on the other layer, region or layer or intervening layers or regions may also be present. Also, if the component is turned over, one layer or region may be "under" or "beneath" another layer or region.
Under different ambient brightness, and for different users, the adaptability of the user to the brightness of the display screen is different. In order to adjust the display brightness of the display screen, the display screen needs to be dimmed. To mitigate or avoid the occurrence of Mura, a Direct Current (DC) dimming mode may be used to dim the display screen in the case that the desired display brightness of the display screen is high. In the case where the desired display brightness of the display screen is low, the display screen may be dimmed using a Pulse Width Modulation (PWM) dimming mode. As the display technology develops, the black insertion accuracy of the PWM dimming mode is also increasing, for example, the black insertion accuracy of the PWM dimming mode can be increased to 8, 16, 24, or 32 pulses. Wherein 8 pulses means that the number of target pulses of the emission control input signal in one image frame is 8. 16pulse, 24pulse, 32pulse and so on. The light-emitting control input signal is an input signal of a light-emitting control signal circuit of the display screen. The light-emitting control signal circuit is used for outputting light-emitting control signals in a pixel driving circuit of the display screen. Specifically, the light emission control signal circuit outputs a light emission control signal according to a light emission control input signal, a first clock signal, and a second clock signal.
For convenience of explanation, a specific light emission control signal circuit is described as an example. Fig. 1 is a schematic structural diagram of a light-emitting control signal circuit in an embodiment of the present application. As shown in fig. 1, the light emission control signal circuit includes transistors M1 to M10, and capacitors C1 to C3. The input signal of the light emission control signal circuit includes a light emission control input signal EIN. The clock signals of the light-emission control signal circuit include a first clock signal ECK1 and a second clock signal ECK 2. The light emission control signal circuit also receives a high level signal VGH and a low level signal VGL. The output signal of the emission control signal circuit is an emission control signal EM. The connection relationship of each component in the light-emitting control signal circuit is shown in fig. 1, and is not described herein again. When the rising edge of the emission control input signal EIN is aligned with the falling edge of the first clock signal ECK1, if the emission control input signal EIN is at a high level, the rising edge of the second clock signal ECK2 corresponds to the rising edge of the emission control signal EM; if the emission control input signal EIN is at a low level, a falling edge of the first clock signal ECK1 corresponds to a falling edge of the emission control signal EM. Under the combined action of the emission control input signal EIN, the first clock signal ECK1, the second clock signal ECK2, the high level signal VGH, and the low level signal VGL, the emission control signal EM output by the emission control signal circuit is made to be a pulse signal.
In the DC dimming mode, the number of pulses of the light emission control input signal EIN in one frame is 1. When switching from the DC dimming mode to the PWM dimming mode with the black insertion accuracy of 16 pulses, the number of pulses of the emission control input signal EIN in one frame is changed to 16. The corresponding relation between the timing sequences of the light-emitting control input signal EIN and the first clock signal ECK1 and the second clock signal ECK2 is changed dramatically, which causes the duration of the light-emitting control signal EM controlling the pixel unit of the display screen to emit light in one frame to be increased greatly, so that the display brightness of the display screen is inverted obviously, and the transition effect of brightness adjustment is poor.
For example, fig. 2 is a schematic diagram illustrating a correspondence between display brightness and a 51 register output value according to an embodiment of the present application. The 51 register output value (i.e., 51 in fig. 2) may adjust the display brightness. As shown in fig. 2, when the 51-register output value is decreased from 1319 to 1318, the dimming mode of the display panel is switched from DC dimming to the PWM dimming mode with the black insertion accuracy of 16 pulses. Under normal conditions, as the output value of the 51 register is reduced, the display brightness of the display screen is also reduced at any time. However, when the DC dimming mode is switched to the PWM dimming mode with the black insertion accuracy of 16 pulses, the display brightness is rather increased, that is, the display brightness of the display panel is significantly inverted.
In order to solve the problem that the transition effect of brightness adjustment is poor due to the fact that the display brightness of the display screen is obviously inverted, embodiments of the present application provide a dimming method and apparatus for a display screen, which can optimize the transition effect of brightness adjustment.
Fig. 3 is a flowchart of a dimming method of a display screen according to an embodiment of the present disclosure. As shown in fig. 3, the dimming method of the display screen may include steps S101 and S102.
In step S101, a brightness level parameter value desired to be adjusted by the display screen is acquired.
The brightness level parameter value and the display brightness of the display screen have a corresponding relation. Specifically, the brightness level parameter value is positively correlated with the display brightness of the display screen. I.e. the larger the value of the brightness level parameter, the higher the display brightness of the display screen. The brightness level parameter value desired to be adjusted may be a target brightness level parameter value of the display screen determined by using a photosensitive component of the display screen, or may be a target brightness level parameter value of the display screen determined according to a brightness adjustment input of a user, such as dragging a brightness bar, and the like, which is not limited herein.
In some examples, the brightness level parameter value may be an output value of a 51 register corresponding to the display screen.
In step S102, the display screen is dimmed using the first dimming mode when the brightness level parameter value is lower than the black insertion brightness threshold value.
The black insertion brightness threshold is a boundary value of brightness level parameter values of the first dimming mode and the second dimming mode. In particular, the second dimming mode may be a DC dimming mode. And if the brightness level parameter value is higher than or equal to the black insertion brightness threshold value, dimming the display screen by utilizing a second dimming mode. And if the brightness level parameter value is lower than the black insertion brightness threshold value, dimming the display screen by utilizing a first dimming mode.
The first dimming mode is specifically a gradual PWM dimming mode. In the first dimming mode, the number of pulses of the light-emitting control input signal of the display screen in one frame gradually changes in a descending order according to the brightness level parameter value, and the number of pulses is in negative correlation with the brightness level parameter value. A frame here refers to an image frame.
The number of pulses of the lighting control input signal in one frame in the first dimming mode is also different corresponding to different brightness level parameter values. For example, fig. 4 is a schematic diagram of an example of the light emitting control input signal switched from the DC dimming mode to the first dimming mode in the embodiment of the present application. The brightness level parameter value is the 51 register output value. The black insertion accuracy of the first dimming mode is 8 pulses, and the target value of the number of pulses of the lighting control input signal in one frame in the first dimming mode is 8. As shown in fig. 4, the 51-register output values (i.e., 51 values in fig. 4) a1, a2, A3, a4, a5, and a6 are sequentially decremented. And if the 51 register output value is greater than or equal to A2, dimming the display screen by using a DC dimming mode. The 51 register output value is less than a2, and the display screen is dimmed by the first dimming mode in the embodiment of the present application. As can be seen from fig. 4, in the process of gradually decreasing the 51 register output value from A3 to a4, a5 and a6, the number of pulses in one frame of the light emission control input signal gradually increases from 2 to 4, 6 and 8.
In the conventional PWM dimming mode, if the value of the brightness level parameter is lower than the black insertion brightness threshold, the value of the brightness level parameter is gradually decreased, but the number of pulses of the light-emitting control input signal in one frame is kept constant. For example, fig. 5 is a schematic diagram of an example of the light emitting control input signal for switching from the DC dimming mode to the conventional PWM dimming mode in the embodiment of the present application. The brightness level parameter value is a 51 register output value. The black insertion accuracy of the conventional PWM dimming mode is 8 pulses, and the target value of the number of pulses of the lighting control input signal in one frame in the conventional PWM dimming mode is 8. As shown in fig. 5, the 51-register output values (i.e., 51 values in fig. 5) a1, a2, A3, a4, a5, and a6 are sequentially decremented. And if the 51 register output value is greater than or equal to A2, dimming the display screen by using a DC dimming mode. The 51 register output value is less than A2, and the display screen is dimmed by adopting the traditional PWM dimming mode. As can be seen from fig. 5, in the process that the 51-register output value gradually decreases from A3 to a4, a5 and a6, the number of pulses of the light emission control input signal in one frame remains unchanged and is always 8. As can be seen from fig. 5, when the conventional PWM dimming mode is switched, the number of pulses of the light-emitting control input signal in one frame is increased sharply, so that the time sequence corresponding relationship between the light-emitting control input signal and the first and second clock signals is changed sharply, which causes the light-emitting control signal to control the pixel unit of the display screen to emit light in one frame, and thus the display brightness of the display screen is significantly inverted.
In the embodiment of the application, when the brightness level parameter value is lower than the black insertion brightness threshold value, the display screen is dimmed by using the first dimming mode. In the first mode, the number of pulses of the light-emitting control input signal of the display screen in one frame gradually changes according to the brightness level parameter value in a descending order, and the number of pulses is in negative correlation with the brightness level parameter value. The number of pulses of the light emission control input signal in one frame may be gradually increased in case the value of the brightness level parameter is decreased. Therefore, sudden change of the light-emitting control input signal caused by switching the dimming mode when the brightness level parameter value is lower than the black insertion brightness threshold value is avoided, severe change of the time sequence corresponding relation of the light-emitting control input signal and the first clock signal and the second clock signal is avoided, increase of the light-emitting time of the light-emitting control signal for controlling the pixel unit of the display screen to emit light in one frame is reduced or even eliminated, obvious reversal of display brightness of the display screen is relieved or even eliminated, and the transition effect of brightness adjustment is improved.
In some examples, the target value of the number of pulses of the light emission control input signal in one frame in the first dimming mode is N. The number of pulses of the light emission control input signal in one frame in the first dimming mode is less than or equal to N, and the number of pulses of the light emission control input signal in one frame in the first dimming mode reaches N at a certain brightness level parameter value. Specifically, the target value is the same as the value of the black insertion accuracy. For example, the black insertion accuracy is 8 pulses, and the target value of the number of pulses of the light emission control input signal in one frame in the first dimming mode is 8. For another example, if the black insertion accuracy is 16 pulses, the target value of the number of pulses of the light emission control input signal in one frame in the first dimming mode is 16. For another example, if the black insertion accuracy is 32 pulses, the target value of the number of pulses of the light emission control input signal in one frame in the first dimming mode is 32.
In the first dimming mode, the number of pulses of the light-emitting control input signal in one frame is sequentially and uniformly increased to N according to the descending order of the brightness level parameter value. For example, as shown in fig. 4, the target value of the number of pulses of the light emission control input signal in one frame in the first dimming mode is 8. For convenience of illustration, if the number of pulses of the light-emitting control input signal in the first dimming mode reaches 8 in one frame, the 8 pulses are numbered p1 to p 8. Correspondingly, pulses of the light emission control input signal corresponding to the 51-register output value a3 appearing in one frame are pulses p1 and p 5; pulses of the light emission control input signal corresponding to the 51 register output value a4 appearing in one frame are pulses p1, p2, p5, and p 6; pulses of the light emission control input signal corresponding to the 51 register output value a5 appearing in one frame are pulses p1, p2, p3, p5, p6, and p 7; pulses of the light emission control input signal corresponding to the 51 register output value a6 appearing in one frame are pulses p1 to p 8. The number of pulses in one frame of the light emission control input signal whose 51-register output value is a4 is increased by 2 compared with the number of pulses in one frame of the light emission control input signal whose 51-register output value is A3; the number of pulses in one frame of the light emission control input signal corresponding to the 51 register output value of a5 is increased by 2 from the number of pulses in one frame of the light emission control input signal corresponding to the 51 register output value of a 4; the number of pulses in one frame of the light emission control input signal whose 51-register output value is a6 is increased by 2 compared with the number of pulses in one frame of the light emission control input signal whose 51-register output value is a 5; a uniform increment of the number of pulses of the lighting control input signal in one frame up to 8 is achieved.
For another example, the target value of the number of pulses of the light emission control input signal in one frame in the first dimming mode is 16. The brightness level parameter value is a 51 register output value. The 51 register output values a1, a2, A3, a4, a5 and a6 are sequentially decreased, and when the 51 register output value is A3, the first dimming mode is switched. For convenience of illustration, if the number of pulses of the light-emitting control input signal in the first dimming mode reaches 16 in one frame, the 16 pulses are numbered p1 to p 16. Correspondingly, pulses of the light emission control input signal corresponding to the 51-register output value a3 appearing in one frame are pulses p1, p5, p9 and p 13; pulses of the light emission control input signal corresponding to the 51 register output value a4 appearing in one frame are pulses p1, p2, p5, p6, p9, p10, p13, and p 14; pulses of the light emission control input signal corresponding to the 51 register output value a5 appearing in one frame are pulses p1, p2, p3, p5, p6, p7, p9, p10, p11, p13, p14, and p 15; pulses of the light emission control input signal corresponding to the 51 register output value a6 occurring in one frame are pulses p1 to p 16. The number of pulses in one frame of the light emission control input signal corresponding to the 51 register output value of a4 is increased by 4 from the number of pulses in one frame of the light emission control input signal corresponding to the 51 register output value of A3; the number of pulses in one frame of the light emission control input signal corresponding to the 51 register output value of a5 is increased by 4 from the number of pulses in one frame of the light emission control input signal corresponding to the 51 register output value of a 4; the number of pulses in one frame of the light emission control input signal with the 51-register output value of a6 is increased by 4 compared with the number of pulses in one frame of the light emission control input signal with the 51-register output value of a 5; a uniform increment of the number of pulses of the lighting control input signal in one frame is achieved up to 16.
The number of pulses of the light-emitting control input signal in one frame is uniformly increased, so that the display brightness of the display screen can be uniformly changed and transited more naturally in the process of reducing the brightness level parameter value, and the transition effect is further improved.
Fig. 6 is a flowchart illustrating a dimming method of a display screen according to another embodiment of the present disclosure. Fig. 6 is different from fig. 3 in that the dimming method of the display screen shown in fig. 6 may further include step S103.
In step S103, the display screen is dimmed using the second dimming mode when the brightness level parameter value is equal to or higher than the black insertion brightness threshold value.
Wherein, in the second dimming mode, the number of pulses of the light emission control input signal in one frame is 1. In particular, the second dimming mode may be a DC dimming mode. In the second dimming mode, the brightness level parameter value is changed, and the number of pulses of the light emission control input signal in one frame is always kept to 1.
In some examples, in order to further reduce or even eliminate an increase in a time period for which the light emission control signal controls the pixel cells of the display screen to emit light in one frame, a width of a first pulse of the light emission control input signal in one frame in the first dimming mode may be set to be the same as a width of a pulse of the light emission control input signal in one frame in the second dimming mode. By setting the width of the first pulse of the light-emitting control input signal in one frame in the first dimming mode, it is ensured that a level signal for controlling the pixel unit of the display screen not to emit light can appear in the light-emitting control signal output by the light-emitting control signal circuit, and the level signal for controlling the pixel unit of the display screen to emit light is prevented from being initiated for a long time from one frame by the light-emitting control signal output by the light-emitting control signal circuit. For example, if the transistor in the pixel driving circuit corresponding to the pixel unit of the display screen is a P-type transistor, and the light-emitting control signal is a high-level signal, the pixel unit does not emit light; when the light-emitting control signal is a low-level signal, the pixel unit emits light. The width of the first high-level pulse of the light-emitting control input signal in one frame in the first dimming mode is ensured to be the same as the width of the high-level pulse of the light-emitting control input signal in one frame in the second dimming mode, so that the first high-level pulse of the light-emitting control signal output by the light-emitting control signal circuit can normally appear, the number of the high-level pulses in the light-emitting control signal is increased, and the total duration of the high-level pulses in the light-emitting control signal is increased. Under the condition that the brightness level parameter value is gradually reduced, the other dimming modes are switched to the first dimming mode, the increase of the time length of the switched light-emitting control signal for controlling the pixel unit of the display screen to emit light in one frame can be reduced or even eliminated, so that the obvious reversal of the display brightness of the display screen is reduced and eliminated, and the transition effect of brightness adjustment is improved.
In some examples, in the first dimming mode, the widths of at least some of the pulses of the lighting control input signal in a frame are gradually changed in descending order according to the brightness level parameter value, and the widths of the pulses are inversely related to the brightness level parameter value. I.e. the lower the value of the brightness level parameter, the larger the width of at least part of the pulses of the lighting control input signal. It is noted that the width of the pulse of the light emission control input signal in the first dimming mode does not exceed the width of the pulse of the light emission control input signal in the second dimming mode. That is, the width of the pulse of the light emission control input signal in one frame in the first dimming mode is less than or equal to the width of the pulse of the light emission control input signal in one frame in the second dimming mode.
For example, fig. 7 is a schematic diagram of another example of the light emitting control input signal switched from the DC dimming mode to the first dimming mode in the embodiment of the present application. The brightness level parameter value is a 51 register output value. The black insertion accuracy of the first dimming mode is 8 pulses, and the target value of the number of pulses of the lighting control input signal in one frame in the first dimming mode is 8. As shown in fig. 7, the 51-register output values (i.e., 51 values in fig. 7) a1, a2, A3, a4, a5, and a6 are sequentially decremented. And if the 51 register output value is greater than or equal to A2, dimming the display screen by using a DC dimming mode. The 51 register output value is less than a2, and the display screen is dimmed by the first dimming mode in the embodiment of the present application. As shown in fig. 7, in the first dimming mode, as the 51 register output value is gradually decreased, the number of pulses in one frame is gradually increased, and the widths of the other pulses except the width of the first pulse in the first frame are gradually increased. The width of the first pulse in one frame in the first dimming mode is the same as the width of the pulse in one frame in the DC dimming mode.
For another example, fig. 8 is a schematic diagram of another example of the light emission control input signal switched from the DC dimming mode to the first dimming mode in the embodiment of the present application. The brightness level parameter value is a 51 register output value. The black insertion accuracy of the first dimming mode is 8 pulses, and the target value of the number of pulses of the lighting control input signal in one frame in the first dimming mode is 8. As shown in fig. 8, the 51-register output values (i.e., 51 values in fig. 8) a1, a2, A3, a4, a5, a6, a7, A8, and a9 are sequentially decremented. And if the 51 register output value is greater than or equal to A2, dimming the display screen by using a DC dimming mode. The 51 register output value is less than a2, and the display screen is dimmed by the first dimming mode in the embodiment of the present application. As shown in fig. 8, the width of the first pulse in a frame in the first dimming mode is the same as the width of the pulse in a frame in the DC dimming mode. As the 51 register output value gradually decreases, the width of the pulse can be kept constant first, and the number of pulses in one frame is increased successively first. After the number of pulses in one frame reaches the target value of 8, the register output value continues to decrease toward 51, and the number of pulses in one frame does not increase any more, but the width of the pulses increases gradually.
The widths of at least part of pulses of the light-emitting control input signal in one frame gradually change in a descending order according to the brightness level parameter values, and the black insertion duration in one frame can be gradually increased in the process of reducing the brightness level parameter values, namely the duration of non-light-emitting of the pixel units in one frame is gradually increased, so that the display brightness of the display screen is gradually reduced along with the descending order of the brightness level parameter values, the change of the display brightness of the display screen is more uniform, the transition is more natural, and the transition effect is further improved.
In the above embodiment, the number of pulses of the light-emitting control input signal in one frame, the width of the pulses, and the positions of the pulses may be further specifically adjusted, so that the light-emitting control input signal is matched with the clock signal in the light-emitting control signal circuit, such that the DC dimming mode is switched to the first dimming mode, the increase of the light-emitting time of the pixel unit of the control display screen in one frame of the light-emitting control signal is eliminated, the apparent inversion of the display brightness of the display screen is eliminated, and the transition effect of brightness adjustment is improved, which is not described herein again.
The embodiment of the application also provides a dimming device of the display screen. Fig. 9 is a schematic structural diagram of a dimming device of a display screen according to an embodiment of the present application. As shown in fig. 9, the dimming device of the display screen may include a parameter obtaining module 201 and a dimming module 202.
The parameter obtaining module 201 may be configured to obtain a brightness level parameter value that the display screen desires to adjust.
The brightness grade parameter value and the display brightness of the display screen have a corresponding relation.
The dimming module 202 may be configured to dim the display screen using the first dimming mode if the brightness level parameter value is below the black-inserted brightness threshold.
In the first dimming mode, the number of pulses of the light-emitting control input signal of the display screen in one frame gradually changes in a descending order according to the brightness level parameter value, and the number of pulses is in negative correlation with the brightness level parameter value.
In the embodiment of the application, when the brightness level parameter value is lower than the black insertion brightness threshold value, the display screen is dimmed by using the first dimming mode. In the first mode, the number of pulses of the light-emitting control input signal of the display screen in one frame gradually changes in descending order according to the brightness level parameter value, and the number of pulses is in negative correlation with the brightness level parameter value. The number of pulses of the light emission control input signal in one frame may be gradually increased in case the value of the brightness level parameter is decreased. Therefore, sudden change of the light-emitting control input signal caused by switching the dimming mode when the brightness level parameter value is lower than the black insertion brightness threshold value is avoided, severe change of the time sequence corresponding relation of the light-emitting control input signal and the first clock signal and the second clock signal is avoided, increase of the light-emitting time of the light-emitting control signal in a frame for controlling the pixel unit of the display screen to emit light is reduced or even eliminated, obvious inversion of the display brightness of the display screen is reduced or even eliminated, and the transition effect of brightness adjustment is improved.
In some examples, in the first dimming mode, the number of pulses of the lighting control input signal in one frame is sequentially and uniformly incremented to N in descending order according to the brightness level parameter value. Where N is a target value of the number of pulses of the light emission control input signal in one frame in the first dimming mode.
In some examples, the dimming module 202 in the above embodiments may be further configured to dim the display screen using the second dimming mode if the brightness level parameter value is higher than or equal to the black-inserted brightness threshold. Wherein, in the second dimming mode, the number of pulses of the light emission control input signal in one frame is 1.
In some examples, a width of a first pulse of the light emission control input signal in one frame in the first dimming mode is the same as a width of a pulse of the light emission control input signal in one frame in the second dimming mode.
In some examples, in the first dimming mode, the widths of at least some of the pulses of the lighting control input signal in a frame are gradually changed in descending order according to the brightness level parameter value, and the widths of the pulses are inversely related to the brightness level parameter value. The width of the pulse of the light-emitting control input signal in one frame in the first dimming mode is less than or equal to the width of the pulse of the light-emitting control input signal in one frame in the second dimming mode.
The dimming device of the display screen in the above embodiments may be disposed in the display device. The display device comprises a display screen of which the dimming device dims light. Specifically, the display device may be a device having a display function, such as a mobile phone, a computer, a tablet computer, a digital photo frame, a television, and electronic paper, which is not limited herein.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts between the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For device embodiments and display device embodiments, reference may be made to the description of the method embodiments for their relevance. The present application is not limited to the particular structures described above and shown in the figures. Those skilled in the art may make various changes, modifications and additions after comprehending the spirit of the present application. The embodiments were chosen and described in order to best explain the principles of the application and its practical application, to thereby enable others skilled in the art to best utilize the application and its various modifications as are suited to the particular use contemplated.
Claims (10)
1. A dimming method of a display screen, comprising:
acquiring a brightness level parameter value which is expected to be adjusted by the display screen, wherein the brightness level parameter value has a corresponding relation with the display brightness of the display screen;
switching from a second dimming mode to a first dimming mode, dimming the display screen using the first dimming mode, in case the brightness level parameter value is lower than a black insertion brightness threshold value, the black insertion brightness threshold value being a boundary value of the brightness level parameter values of the first and second dimming modes, the first dimming mode being a PWM dimming mode, the second dimming mode being a DC dimming mode,
in the first dimming mode, the number of pulses of the light-emitting control input signal of the display screen in one frame gradually changes in a descending order according to the brightness level parameter value, and the number of pulses is in negative correlation with the brightness level parameter value.
2. The method of claim 1,
in the first dimming mode, the number of pulses of the light emission control input signal in one frame is sequentially and uniformly increased to N according to the descending order of the brightness level parameter value,
wherein N is a target value of the number of pulses of the light emission control input signal in one frame in the first dimming mode.
3. The method of claim 1, further comprising:
dimming the display screen using a second dimming mode if the brightness level parameter value is greater than or equal to the black-inserted brightness threshold,
wherein, in the second dimming mode, the number of pulses of the light emission control input signal in one frame is 1.
4. The method of claim 3,
a width of a first pulse of the light emission control input signal in one frame in the first dimming mode is the same as a width of a pulse of the light emission control input signal in one frame in the second dimming mode.
5. The method of claim 3 or 4,
in the first dimming mode, the widths of at least part of pulses of the light emission control input signal in one frame gradually change in descending order according to the brightness level parameter value, and the widths of the pulses are in negative correlation with the brightness level parameter value,
wherein the width of the pulse of the light emission control input signal in one frame in the first dimming mode is less than or equal to the width of the pulse of the light emission control input signal in one frame in the second dimming mode.
6. A dimming device for a display screen, comprising:
the parameter acquisition module is used for acquiring a brightness level parameter value which is expected to be adjusted by the display screen, and the brightness level parameter value and the display brightness of the display screen have a corresponding relation;
a dimming module for switching from a second dimming mode to a first dimming mode and dimming the display screen using the first dimming mode when the brightness level parameter value is lower than a black insertion brightness threshold value, where the black insertion brightness threshold value is a boundary value of the brightness level parameter values of the first dimming mode and the second dimming mode, the first dimming mode is a PWM dimming mode, and the second dimming mode is a DC dimming mode,
in the first dimming mode, the number of pulses of the light-emitting control input signal of the display screen in one frame gradually changes in a descending order according to the brightness level parameter value, and the number of pulses is in negative correlation with the brightness level parameter value.
7. The apparatus of claim 6,
in the first dimming mode, the number of pulses of the light emission control input signal in one frame is sequentially and uniformly increased to N according to the descending order of the brightness level parameter value,
wherein N is a target value of the number of pulses of the light emission control input signal in one frame in the first dimming mode.
8. The apparatus of claim 6, wherein the dimming module is further configured to:
dimming the display screen using a second dimming mode if the brightness level parameter value is greater than or equal to the black insertion brightness threshold,
wherein, in the second dimming mode, the number of pulses of the light emission control input signal in one frame is 1.
9. The apparatus of claim 8,
the width of a first pulse of the light emission control input signal in one frame in the first dimming mode is the same as the width of a pulse of the light emission control input signal in one frame in the second dimming mode.
10. The apparatus of claim 8 or 9,
in the first dimming mode, the widths of at least part of pulses of the light emission control input signal in one frame gradually change in descending order according to the brightness level parameter value, and the widths of the pulses are in negative correlation with the brightness level parameter value,
wherein the width of the pulse of the light emission control input signal in one frame in the first dimming mode is less than or equal to the width of the pulse of the light emission control input signal in one frame in the second dimming mode.
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| CN114253012B (en) * | 2021-12-31 | 2023-09-22 | 天马微电子股份有限公司 | Display device, backlight source and automobile |
| CN114822394B (en) * | 2022-05-05 | 2023-06-30 | 武汉天马微电子有限公司 | Dimming method, device and equipment of display panel and computer readable storage medium |
| CN117153075B (en) * | 2022-05-30 | 2024-07-12 | 荣耀终端有限公司 | Screen brightness adjusting method, electronic device and computer readable storage medium |
| CN115547236B (en) * | 2022-10-25 | 2024-06-21 | 厦门天马显示科技有限公司 | Display panel, driving method thereof and display device |
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| CN103956143A (en) * | 2014-05-21 | 2014-07-30 | 友达光电股份有限公司 | Driving device for active matrix organic light emitting diode displayer |
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