CN111798813B - Brightness adjusting method and device of display device and display device - Google Patents
Brightness adjusting method and device of display device and display device Download PDFInfo
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- CN111798813B CN111798813B CN202010698975.1A CN202010698975A CN111798813B CN 111798813 B CN111798813 B CN 111798813B CN 202010698975 A CN202010698975 A CN 202010698975A CN 111798813 B CN111798813 B CN 111798813B
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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
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/10—Intensity circuits
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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
Abstract
The application provides a brightness adjusting method and device of a display device and the display device, and relates to the technical field of display. The brightness adjusting method comprises the following steps: acquiring a DBV curve according to the corresponding relation between a display brightness value DBV and an actual brightness value of a display device, wherein the DBV curve comprises a first nonlinear interval, the first nonlinear interval comprises a second nonlinear interval, the part obtained by intercepting the DBV curve by the first nonlinear interval is a nonlinear curve, the intercept point of intercepting the DBV curve by the second nonlinear interval comprises an origin and a first target point, the actual brightness value corresponding to the first target point is greater than or equal to a low-brightness threshold, and the slope of each point of the DBV curve in the second nonlinear interval is smaller than the slope of a connecting straight line between the first target point and the origin; and adjusting the brightness of the display device according to the adjusted target DBV and DBV curve. By the aid of the technical scheme, transition effect of brightness change in the brightness adjusting process can be improved.
Description
Technical Field
The application belongs to the technical field of display, and particularly relates to a brightness adjusting method and device for a display device and the display device.
Background
Under different ambient brightness, human eyes have different adaptability to the brightness of the display device. The display device can automatically adjust the brightness of the display device by utilizing the photosensitive assembly. Alternatively, the display device adjusts the brightness of the display device according to a manual adjustment instruction of the user.
With the rapid development of display technology, the display effect requirements of users on display devices are also higher and higher. In order to assess the display effect of the display device, a display effect parameter for evaluating the display effect is set. The display effect parameter is used for representing whether the brightness change transition is smooth in the brightness adjusting process. If the display effect parameter meets the standard requirement, the brightness change of the display device is transited smoothly in the dimming process. However, when the display device is at a lower brightness, the brightness change is more sensitive, the display effect parameters cannot meet the standard requirements, and the transition effect of the brightness change in the brightness adjustment process is poor.
Disclosure of Invention
The embodiment of the application provides a brightness adjusting method and device of a display device and the display device, which can improve the transition effect of brightness change in the brightness adjusting process.
In a first aspect, an embodiment of the present application provides a brightness adjustment method for a display device, including: acquiring a DBV curve according to the corresponding relation between a display brightness value DBV and an actual brightness value of a display device, wherein the DBV curve comprises a first nonlinear interval, the first nonlinear interval comprises a second nonlinear interval, the part obtained by intercepting the DBV curve by the first nonlinear interval is a nonlinear curve, the intercept point of intercepting the DBV curve by the second nonlinear interval comprises an origin and a first target point, the actual brightness value corresponding to the first target point is greater than or equal to a low-brightness threshold, and the slope of each point of the DBV curve in the second nonlinear interval is smaller than the slope of a connecting straight line between the first target point and the origin; and adjusting the brightness of the display device according to the adjusted target DBV and DBV curve.
According to the first aspect of the embodiment of the present application, the DBV and the actual brightness value of the DBV curve corresponding to each point in the second nonlinear section satisfy an exponential functional relationship.
According to a first aspect of embodiments of the present application, the DBV curve further comprises a linear interval, and a slope of the DBV curve at each point in the linear interval is greater than a slope of the DBV curve at each point in the second non-linear interval.
According to a first aspect of embodiments of the present application, adjusting the brightness of the display device according to the adjusted target DBV and DBV curve comprises: under the condition that the adjusted target DBV is lower than or equal to the target dimming switching threshold, adjusting the brightness of the display device by adopting a Pulse Width Modulation (PWM) dimming mode according to the target DBV and the DBV curve; and under the condition that the adjusted target DBV is higher than a target dimming switching threshold value, adjusting the brightness of the display device by adopting a direct current DC dimming mode according to the target DBV and the DBV curve, wherein the target dimming switching threshold value is lower than a standard dimming switching threshold value.
In a second aspect, an embodiment of the present application provides a brightness adjustment device, including: the acquiring module is used for acquiring a DBV curve according to the corresponding relation between a display brightness value DBV and an actual brightness value of the display device, wherein the DBV curve comprises a first nonlinear interval, the first nonlinear interval comprises a second nonlinear interval, the part obtained by intercepting the DBV curve by the first nonlinear interval is a nonlinear curve, the interception point of intercepting the DBV curve by the second nonlinear interval comprises an origin and a first target point, the actual brightness value corresponding to the first target point is greater than or equal to a low-brightness threshold, and the slope of each point of the DBV curve in the second nonlinear interval is smaller than the slope of a connecting straight line of the first target point and the origin; and the adjusting module is used for adjusting the brightness of the display device according to the adjusted target DBV and DBV curve.
According to a second aspect of the embodiments of the present application, the DBV and the actual brightness value of the DBV curve corresponding to each point in the second nonlinear section satisfy an exponential functional relationship.
According to a second aspect of embodiments of the present application, the DBV curve further comprises a linear interval, and a slope of the DBV curve at each point in the linear interval is greater than a slope of the DBV curve at each point in the second non-linear interval.
According to a second aspect of embodiments of the present application, the adjusting module is specifically configured to: under the condition that the adjusted target DBV is lower than or equal to the target dimming switching threshold, adjusting the brightness of the display device by adopting a Pulse Width Modulation (PWM) dimming mode according to the target DBV and the DBV curve; and under the condition that the adjusted target DBV is higher than a target dimming switching threshold value, adjusting the brightness of the display device by adopting a direct current DC dimming mode according to the target DBV and the DBV curve, wherein the target dimming switching threshold value is lower than a standard dimming switching threshold value.
In a third aspect, an embodiment of the present application provides a display device, including the brightness adjustment device in the technical solution of the second aspect.
According to a third aspect of the embodiments of the present application, the display device further includes a light emission control signal circuit; a light emission control signal outputted from a light emission control signal circuit is used for driving a pixel driving circuit for one row of pixels.
The embodiment of the application provides a brightness adjusting method and device of a display device and the display device, and the brightness of the display device is adjusted according to an adjusted target DBV and a DBV curve. The DBV curve is used to characterize the correspondence between the DBV and the actual luminance value of the display device. And the DBV curve comprises a first non-linear interval, and the part of the DBV curve in the first non-linear interval is a non-linear curve. The first nonlinear interval comprises a second nonlinear interval, and the actual brightness value corresponding to the first target point in the node of the DBV curve intercepted by the second nonlinear interval is greater than or equal to the low brightness threshold. The slope of each point of the DBV curve in the second nonlinear interval is smaller than the slope of a connecting straight line of the first target point and the origin. The slope of each point of the DBV curve in the second nonlinear interval is lower than that of the linear curve, so that the brightness change in the brightness adjusting process is reduced under the low-brightness condition, and the transition effect of the brightness change in the brightness adjusting process is further 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 diagram of an example of a DBV curve.
Fig. 2 is a flowchart illustrating a brightness adjustment method of a display device according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of an example of a DBV curve provided by an embodiment of the present application;
FIG. 4 is a diagram illustrating the relationship between the DBV and DL/L using a linear DBV curve for brightness adjustment;
FIG. 5 is a diagram illustrating a DBV and DL/L relationship for brightness adjustment using a DBV curve in an embodiment of the present application;
FIG. 6 is a schematic diagram of another example of a DBV curve provided by an embodiment of the present application;
fig. 7 is a schematic structural diagram of a light emission control signal circuit in an embodiment of the present application;
fig. 8 is a schematic diagram of a light-emitting control input signal for switching from the DC dimming mode to the PWM dimming mode according to an embodiment of the present invention;
fig. 9 is a flowchart of a brightness adjustment method of a display device according to another embodiment of the present application;
FIG. 10 is a diagram illustrating the relationship between the DBV and DL/L for brightness adjustment using a standard dimming switching threshold;
FIG. 11 is a diagram illustrating a DBV and DL/L relationship for brightness adjustment using a target dimming switching threshold in an embodiment of the present application;
fig. 12 is a schematic structural diagram of a brightness adjustment device according to an embodiment of the present application;
FIG. 13 is a diagram illustrating a relationship between DBV and DL/L for brightness adjustment by a first driving mode and a second driving mode of a light-emitting control signal circuit;
FIG. 14 is a diagram illustrating a relationship between DBVs and DL/Ls for brightness adjustment by a driving method of a light-emitting control signal circuit according to an embodiment of the present disclosure.
Detailed Description
Features and exemplary embodiments of various aspects 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 the present application and are not intended to limit the present 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 user's adaptability to the brightness of the display device is also different. In order to adjust the luminance of the display device, the luminance of the display device needs to be adjusted. In order to be able to evaluate the transitional effect of the brightness change during the brightness adjustment of the display device, the transitional effect of the brightness change can be characterized by a display effect parameter. For example, the Display effect parameter may be DL/L, and DL/L may represent a change in an actual Brightness Value of the Display device during a process of adjusting a Display Brightness Value (DBV) to another DBV. The DBV may be embodied as a 51 register output value. For example, in the process of adjusting the 51-register output value from high to low, DL/L ═ first luminance value-second luminance value)/first luminance value. The first brightness value is the actual brightness value corresponding to the current 51 register output value. The second luminance value is the actual luminance value corresponding to the next 51 register output value. And when the DL/L is less than 0.03, the display effect parameter is considered to meet the standard requirement, and the transition effect of brightness change is good.
The DBV curve can be used to adjust the brightness of the display device. The DBV curve represents the corresponding relationship between the DBV and the actual brightness of the display device corresponding to a certain gray scale. In some examples, the DBV curve may characterize a DBV versus actual brightness for a 255 gray level of the display device. The actual brightness corresponding to a certain gray scale of a DBV is obtained according to the DBV curve, and then a Gamma (Gamma) curve corresponding to the DBV can be obtained according to the obtained actual brightness corresponding to the certain gray scale, that is, the brightness of the display device can be adjusted by using the obtained Gamma curve, so that the display device can display the brightness corresponding to other gray scales under the DBV.
FIG. 1 is a schematic diagram of an example of a DBV curve. As shown in fig. 1, the abscissa represents a DBV, and the ordinate represents an actual luminance value of the display device. The unit of the actual luminance value may be nit (i.e., nit). The DBV curve shown in fig. 1 is a curve composed of linear straight lines. As can be seen from fig. 1, when the luminance of the display device is low, such as when the actual luminance value is less than 30 nit, the luminance of the display device is adjusted, and the variation in luminance is large, so that the DL/L value is also large, and the standard requirement cannot be met.
The embodiment of the application provides a brightness adjusting method and device for a display device and the display device, which can ensure that display effect parameters of the display device in a brightness adjusting process under low brightness can also meet standard requirements, improve the transition effect of brightness change in the brightness adjusting process, and further improve the display effect of the display device.
Fig. 2 is a flowchart of a brightness adjustment method of a display device according to an embodiment of the present disclosure. As shown in fig. 2, the brightness adjustment method may include step S101 and step S102.
In step S101, a DBV curve is obtained according to a correspondence between a DBV and an actual luminance value of the display device.
In an embodiment of the present application, the DBV curve includes a first non-linear interval. And a part obtained by intercepting the DBV curve by the first nonlinear interval is a nonlinear curve. I.e. the part of the DBV curve intercepted by the first non-linear interval is a non-linear curve. The first non-linear interval includes a second non-linear interval. The portion of the DBV curve intercepted by the second non-linear interval belongs to the portion of the DBV curve intercepted by the first non-linear interval. The intercept point of the first nonlinear section intercepting the DBV curve includes an origin point and a second target point. The intercept point of the second non-linear section intercepting the DBV curve includes an origin point and a first target point. The DBV corresponding to the first target point is less than or equal to the DBV corresponding to the second target point. And the actual brightness value corresponding to the first target point is less than or equal to the actual brightness value corresponding to the second target point. And if the DBV corresponding to the first target point is equal to the DBV corresponding to the second target point, namely the first target point and the second target point are the same point, the second nonlinear interval is the first nonlinear interval. And if the DBV corresponding to the first target point is smaller than the DBV corresponding to the second target point, the second nonlinear interval is a part of the first nonlinear interval.
The actual brightness value of the display device corresponding to the first target point is greater than or equal to the low brightness threshold value. The low brightness threshold is used for representing a demarcation point of low brightness, and in the case that the actual brightness value of the display device is smaller than the low brightness threshold, the low brightness threshold indicates that the brightness of the display device is in a low brightness range. The slope of each point of the DBV curve in the second nonlinear interval is smaller than that of a connecting straight line between the first target point and the origin, so that the brightness change in the brightness adjusting process is reduced under the low-brightness condition, and the transition effect of the brightness change in the brightness adjusting process is improved.
For example, fig. 3 is a schematic diagram of an example of a DBV curve provided in an embodiment of the present application. As shown in fig. 3, the abscissa represents a DBV, and the ordinate represents an actual luminance value of the display device. The unit of the actual brightness value is nit. The first non-linear interval is labeled D1. The second non-linear interval is labeled D2. In the DBV curve shown in fig. 3, the second non-linear section is a portion of the first non-linear curve. The second target point is labeled a 2. The first target point is labeled a 1. The actual brightness value corresponding to the first target point a1 is equal to the low brightness threshold. The slope of the DBV curve at each point in the second non-linear interval is less than the slope of the straight line connecting the first target point a1 and the origin a 0.
The second target point, the first target point and the low brightness threshold may be set according to the operation requirement of the display device, and are not limited herein. For example, the DBV corresponding to the second target point may be about 2000, and the actual brightness value of the display device corresponding to the second target point may be about 440 nits. The DBV corresponding to the first target point may be about 400, and the actual brightness value of the display device corresponding to the first target point may be about 15 nits. The low brightness threshold may be around 10 nits.
In step S102, the brightness of the display device is adjusted according to the adjusted target DBV and DBV curve.
Specifically, an actual brightness value of the display device corresponding to the target DBV may be acquired on the DBV curve according to the adjusted target DBV. A gamma curve corresponding to a target DBV is acquired according to an actual brightness value of a display device corresponding to the target DBV. And adjusting the brightness of the display device according to the gray scale and the gamma curve corresponding to the current display.
In the embodiment of the present application, the brightness of the display device is adjusted according to the adjusted target DBV and DBV curve. The DBV curve is used to characterize the correspondence between the DBV and the actual luminance value of the display device. And the DBV curve comprises a first non-linear interval, and the part of the DBV curve in the first non-linear interval is a non-linear curve. The first nonlinear interval comprises a second nonlinear interval, and the actual brightness value corresponding to the first target point in the node of the DBV curve intercepted by the second nonlinear interval is greater than or equal to the low brightness threshold. The slope of each point of the DBV curve in the second nonlinear interval is smaller than the slope of a connecting straight line of the first target point and the origin. The slope of each point of the DBV curve in the second nonlinear interval is lower than that of the linear curve, so that the brightness change in the brightness adjusting process is reduced under the low-brightness condition, the transition effect of the brightness change in the brightness adjusting process is further improved, and the display effect parameters of the display device in the brightness adjusting process under the low brightness can also meet the standard requirements.
In order to more intuitively express the improvement of the transition effect of the brightness change during the brightness adjustment, the following description will be made by comparing the DL/L for brightness adjustment using the DBV curve in the embodiment of the present application with the DL/L for brightness adjustment using the linear DBV curve. FIG. 4 is a diagram illustrating the relationship between the DBV and DL/L using a linear DBV curve for brightness adjustment. FIG. 5 is a diagram illustrating a DBV and DL/L relationship for brightness adjustment using a DBV curve in an embodiment of the present application. Wherein the abscissa represents DBV and the ordinate represents DL/L. As shown in FIG. 4, the linear DBV curve is adopted for brightness adjustment, and at low brightness, such as about 10 DBV, DL/L exceeds 0.03, even reaches about 0.09, and far exceeds the standard requirement. As shown in fig. 5, the DBV curve in the embodiment of the present application is used to adjust the brightness, and the DL/L is about 0.03 but not about 10 at low brightness, such as DBV, which meets the standard requirement, greatly improves the transition effect of brightness change, and improves the display effect of the display device.
In some examples, the DBV and the actual brightness value of the DBV curve in the above embodiments at each point in the second non-linear section satisfy an exponential function relationship. That is, in the embodiment of the present application, the function corresponding to the portion of the DBV curve intercepted by the second nonlinear interval may be an exponential function. In some cases, the DBV and the actual brightness value corresponding to each point in the first nonlinear interval may also satisfy an exponential functional relationship. The exponential function may be set according to specific work requirements, and is not limited herein.
For example, fig. 6 is a schematic diagram of another example of a DBV curve provided by an embodiment of the present application. Where the abscissa represents the DBV and the ordinate represents the actual luminance value of the display device. The unit of the actual brightness value is nit. As shown in fig. 6, each point on the DBV curve satisfies an exponential function relationship, and the variation of the value of the DBV is 757 in the range of the actual brightness value of 2 to 30 nits. On the linear DBV curve shown in fig. 1, the variation of the DBV value is 175 in the range of the actual brightness value of 2 to 30 nits. Compared with the DBV curve shown in fig. 1, the actual brightness value of the DBV curve shown in fig. 6 changes more gradually with the DBV change, so that DL/L can meet the standard requirement, the transition effect of brightness change is improved, and the display effect of the display device is improved.
The functional relationship that the DBV corresponding to each point of the DBV curve in the second nonlinear interval and the actual brightness value satisfy in the foregoing embodiment may also be a functional relationship that the slope of each point of the DBV curve in the second nonlinear interval is smaller than the slope of the connecting straight line between the first target point and the origin, and is not limited to an exponential functional relationship here.
In some examples, the DBV curve in the above embodiments may further include a linear interval. The DBV corresponding to each point of the DBV curve in the linear interval is larger than the DBV corresponding to each point of the DBV curve in the first nonlinear interval. The actual brightness value of each point of the DBV curve in the linear interval is larger than the actual brightness value of each point of the DBV curve in the first nonlinear interval. The slope of the DBV curve at each point in the linear interval is greater than the slope of the DBV curve at each point in the second non-linear interval. For example, in fig. 3, the linear interval is labeled D3. The sensitivity of the human eye to the brightness variation under the condition of higher brightness is lower than that under the condition of lower brightness, so that the linear part in the DBV curve in the embodiment of the present application can be utilized to adjust the brightness of the display device under the condition of higher brightness.
When the DBV is high, the display device may be adjusted in brightness by a Direct Current (DC) dimming method. When the DBV is low, the display device may be adjusted in brightness by a Pulse Width Modulation (PWM) dimming method. For example, the display device may be adjusted in brightness using DC dimming when the DBV is higher than the standard dimming switching threshold. And when the DBV is lower than or equal to the standard dimming switching threshold value, the brightness of the display device is adjusted by adopting a PWM dimming mode. The standard dimming switching threshold is a boundary value of the DBV for switching the DC dimming mode and the PWM dimming mode.
The DC dimming mode and the PWM dimming mode adjust the luminance of the display device by adjusting a light emission control input signal of the light emission control signal circuit. The light-emitting control signal circuit receives a light-emitting control input signal and outputs a light-emitting control signal. The light emission control signal can be used to drive a pixel driving circuit to control the pixels in the display device to emit light.
For convenience of explanation, a specific light emission control signal circuit is described as an example. Fig. 7 is a schematic structural diagram of a light emission control signal circuit in the embodiment of the present application. As shown in fig. 7, 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.
Fig. 8 is a schematic diagram of a light-emitting control input signal for switching from the DC dimming mode to the PWM dimming mode according to an embodiment of the present disclosure. TH1, TH2, TH3 and TH4 are DBVs, and the sizes decrease in sequence. If the DBV is higher than TH3, adjusting the brightness of the display device by adopting a DC dimming mode; and if the DBV is lower than or equal to TH3, adjusting the brightness of the display device by adopting a PWM dimming mode. As shown in fig. 8, in the PWM dimming method, the high-level pulse width of the emission control input signal gradually increases and the low-level pulse width gradually decreases as the DBV decreases.
In order to further improve the transition effect of brightness change in the brightness adjustment process, improve the display effect of the display device, and reduce the DBV boundary value for switching the DC dimming mode and the PWM dimming mode, a target dimming switching threshold value lower than the standard dimming switching threshold value is used as the DBV boundary value for switching the DC dimming mode and the PWM dimming mode. For example, the actual brightness value of the target dimming switching threshold corresponding to the DBV curve may be 100 nits.
Fig. 9 is a flowchart of a brightness adjustment method of a display device according to another embodiment of the present application. Fig. 9 is different from fig. 2 in that step S102 shown in fig. 2 can be specifically subdivided into step S1021 or step S1022 shown in fig. 9.
In step S1021, when the adjusted target DBV is lower than or equal to the target dimming switching threshold, the brightness of the display device is adjusted by the PWM dimming method according to the target DBV and the DBV curve.
Specifically, according to the target DBV, an actual brightness value of the display device corresponding to the target DBV on the DBV curve is obtained, and the brightness of the display device is adjusted by adopting a PWM dimming manner, so that the brightness of the display device reaches the actual brightness value.
In step S1022, when the adjusted target DBV is higher than the target dimming switching threshold, the brightness of the display device is adjusted by using the DC dimming method according to the target DBV and the DBV curve.
Specifically, according to the target DBV, an actual brightness value of the display device corresponding to the target DBV on the DBV curve is obtained, and the brightness of the display device is adjusted by using a DC dimming manner, so that the brightness of the display device reaches the actual brightness value.
In the embodiment of the application, the target dimming switching threshold lower than the standard dimming switching threshold is used as the boundary value of the DBV for switching the DC dimming mode and the PWM dimming mode, and compared with the standard dimming switching threshold used as the boundary value of the DBV for switching the DC dimming mode and the PWM dimming mode, under the same brightness adjustment condition, the brightness change range is smaller, the transition effect of the brightness change in the brightness adjustment process is better, and the display effect of the display device is better.
In order to more intuitively express the improvement of the transitional effect of the brightness change in the brightness adjustment process, the following description will be made by comparing the DL/L of the brightness adjustment using the target dimming switching threshold value in the embodiment of the present application with the DL/L of the brightness adjustment using the standard dimming switching threshold value. FIG. 10 is a diagram illustrating the relationship between the DBV and DL/L for brightness adjustment using the standard dimming switching threshold. FIG. 11 is a diagram illustrating a relationship between DBVs and DL/Ls for brightness adjustment by using target dimming switching thresholds in an embodiment of the present application. Wherein the abscissa represents DBV and the ordinate represents DL/L. As shown in fig. 10, DL/L corresponding to a DBV below 210 is mostly greater than 0.02 when the brightness is adjusted by using the standard dimming switching threshold. As shown in fig. 11, when the target dimming switching threshold in the embodiment of the present application is used to perform brightness adjustment, DL/L corresponding to substantially all DBVs is less than 0.02, which further reduces DL/L, improves transition effect of brightness change, and improves display effect of the display device.
The application also provides a brightness adjusting device. Fig. 12 is a schematic structural diagram of a brightness adjustment device according to an embodiment of the present application. As shown in fig. 12, the brightness adjusting apparatus may include an obtaining module 201 and an adjusting module 202.
The obtaining module 201 is configured to obtain a DBV curve according to a corresponding relationship between a DBV and an actual brightness value of a display device.
The DBV curve includes a first non-linear interval. The first non-linear interval includes a second non-linear interval. And a part obtained by intercepting the DBV curve by the first nonlinear interval is a nonlinear curve. The intercept point of the second non-linear section intercepting the DBV curve includes an origin point and a first target point. The actual brightness value corresponding to the first target point is greater than or equal to the low brightness threshold value. The slope of each point of the DBV curve in the second nonlinear interval is smaller than the slope of a connecting straight line of the first target point and the origin.
The adjusting module 202 is used for adjusting the brightness of the display device according to the adjusted target DBV and DBV curve.
In the embodiment of the present application, the brightness of the display device is adjusted according to the adjusted target DBV and DBV curve. The DBV curve is used to characterize the correspondence between the DBV and the actual luminance value of the display device. And the DBV curve comprises a first non-linear interval, and the part of the DBV curve in the first non-linear interval is a non-linear curve. The first nonlinear interval comprises a second nonlinear interval, and the actual brightness value corresponding to the first target point in the node of the DBV curve intercepted by the second nonlinear interval is greater than or equal to the low brightness threshold. The slope of each point of the DBV curve in the second nonlinear interval is smaller than the slope of a connecting straight line of the first target point and the origin. The slope of each point of the DBV curve in the second nonlinear interval is lower than that of the linear curve, so that the brightness change in the brightness adjusting process is reduced under the low-brightness condition, the transition effect of the brightness change in the brightness adjusting process is further improved, and the display effect parameters of the display device in the brightness adjusting process under the low brightness can also meet the standard requirements.
In some examples, the DBV and the actual brightness value of the DBV curve at each point in the second non-linear interval satisfy an exponential functional relationship.
In some examples, the DBV curve further includes a linear interval, and a slope of the DBV curve at each point in the linear interval is greater than a slope of the DBV curve at each point in the second non-linear interval.
In some examples, the adjustment module 202 may be specifically configured to: under the condition that the adjusted target DBV is lower than or equal to the target dimming switching threshold, adjusting the brightness of the display device by adopting a Pulse Width Modulation (PWM) dimming mode according to the target DBV and the DBV curve; and under the condition that the adjusted target DBV is higher than a target dimming switching threshold value, adjusting the brightness of the display device by adopting a direct current DC dimming mode according to the target DBV and the DBV curve, wherein the target dimming switching threshold value is lower than a standard dimming switching threshold value.
The application also provides a display device. The display device may include the brightness adjustment device in the above embodiments.
In some examples, the display device may further include a light emission control signal circuit. The circuit structure of the light-emitting control signal circuit can refer to the light-emitting control signal circuit shown in fig. 7 and the related description in the above embodiments, and is not repeated herein.
In order to further improve the transition effect of brightness change in the brightness adjustment process and improve the display effect of the display device, the output precision of the light-emitting control signal circuit can be improved as much as possible. Specifically, the light emission control signal outputted from the light emission control signal circuit drives the pixel drive circuits of the fewer rows of pixels, and the output accuracy of the light emission control signal circuit is higher.
In the embodiment of the present application, the light emission control signal outputted from one light emission control signal circuit is used for driving the pixel driving circuit of one row of pixels. That is, the brightness of the display device can be adjusted by driving the pixel driving circuit of one row of pixels by one light-emitting control signal circuit.
The higher the output precision of the light-emitting control signal circuit is, the smaller the brightness change amplitude in the brightness adjustment process is, i.e. the smoother the transition of the brightness change in the brightness adjustment process is. The lower the output precision of the light-emitting control signal circuit, the larger the brightness change amplitude in the brightness adjustment process, i.e., the more drastic the transition of the brightness change in the brightness adjustment process.
For example, in the case of a one-line driving method using a light emission control signal circuit, that is, in the case where a light emission control signal outputted from one light emission control signal circuit drives a pixel driving circuit of one row of pixels, the variation accuracy of the corresponding light emission control signal is 2 unit values. If the pulse width of the light emission control input signal is increased by a 1-width unit value, the pulse width of the output light emission control signal is not changed and the luminance of the corresponding display device is not changed because the variation accuracy of the light emission control signal is not achieved. If the pulse width of the light-emitting control input signal is increased by 2 width unit value, the change precision of the light-emitting control signal is achieved, the pulse width of the output light-emitting control signal is increased by 2 width unit value, and the brightness unit value is reduced by 2 corresponding to the actual brightness value. The brightness change amplitude is small, namely the transition of the brightness change in the brightness adjusting process is smooth, and the display effect is good.
When the two-way driving of the light-emitting control signal circuit is adopted, namely, when the light-emitting control signal output by one light-emitting control signal circuit drives the pixel driving circuit of two rows of pixels, the variation precision of the corresponding light-emitting control signal is 4 unit values. If the pulse width of the light emission control input signal is increased by a value of 1 width unit, 2 width units or 3 width units, the pulse width of the output light emission control signal is not changed and the luminance of the corresponding display device is not changed because the change accuracy of the light emission control signal is not reached. If the pulse width of the light-emitting control input signal is increased by 4 width unit value, the change precision of the light-emitting control signal is achieved, the pulse width of the output light-emitting control signal is increased by 4 width unit value, and the brightness value is decreased by 4 brightness unit value corresponding to the actual brightness value. The brightness change range is large, namely the transition of the brightness change in the brightness adjusting process is not smooth, and the display effect is poor.
In the embodiment of the application, a driving mode with high output precision of the light-emitting control signal circuit is adopted, that is, the light-emitting control signal output by one light-emitting control signal circuit drives the pixel driving circuit of one row of pixels, the brightness change amplitude in the brightness adjustment process is small, the transition of the brightness change in the brightness adjustment process is smooth, and the display effect is better.
In order to more intuitively show the improvement of the transition effect of the brightness change in the brightness adjustment process, the following description is made by comparing the DL/L for brightness adjustment by the first driving method of the light-emitting control signal circuit and the DL/L for brightness adjustment by the first driving method of the light-emitting control signal circuit in the embodiment of the present application. FIG. 13 is a diagram illustrating a relationship between DBV and DL/L for brightness adjustment by a first driving method and a second driving method of a light-emitting control signal circuit. FIG. 14 is a diagram illustrating a relationship between DBVs and DL/Ls for brightness adjustment by a driving method of a light-emitting control signal circuit according to an embodiment of the present disclosure. Wherein the abscissa represents DBV and the ordinate represents DL/L. As shown in FIG. 13, the brightness adjustment is performed by adopting the first-driving-two manner of the light-emitting control signal circuit, and the DL/L corresponding to the DBV being lower than 210 is substantially more than 0.02. As shown in fig. 14, the brightness adjustment is performed in a driving manner by using the light-emitting control signal circuit in the embodiment of the present application, and the DL/L corresponding to substantially all DBVs is less than 0.02, so that the DL/L is further reduced, the transition effect of brightness change is improved, and the display effect of the display device is improved.
The display device in the above embodiment includes a display screen whose 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 in 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 brightness adjustment method of a display device, comprising:
acquiring a DBV curve according to a corresponding relation between a DBV (digital video) display brightness value and an actual brightness value of the display device, wherein the DBV curve represents the corresponding relation between the DBV and the actual brightness corresponding to a gray scale of the display device, the DBV curve comprises a first nonlinear section and a linear section, the first nonlinear section comprises a second nonlinear section, a part obtained by intercepting the DBV curve by the first nonlinear section is a nonlinear curve, an intercept point of the DBV curve by the second nonlinear section comprises an origin and a first target point, the actual brightness value corresponding to the first target point is greater than or equal to a low brightness threshold, the slope of each point of the DBV curve in the second nonlinear section is smaller than that of a connecting straight line between the first target point and the origin, and the actual brightness value corresponding to each point of the DBV curve in the linear section is greater than the actual brightness value corresponding to each point of the DBV curve in the first nonlinear section;
and adjusting the brightness of the display device according to the adjusted target DBV and the DBV curve.
2. The method according to claim 1, wherein the DBV and the actual brightness value of the DBV curve at each point in the second non-linear interval satisfy an exponential function relationship.
3. The method of claim 1, wherein the slope of the DBV curve at each point in the linear interval is greater than the slope of the DBV curve at each point in the second non-linear interval.
4. The method of claim 1, wherein said adjusting the brightness of the display device based on the adjusted target DBV and the DBV curve comprises:
under the condition that the adjusted target DBV is lower than or equal to a target dimming switching threshold value, adjusting the brightness of the display device by adopting a Pulse Width Modulation (PWM) dimming mode according to the target DBV and the DBV curve;
adjusting the brightness of the display device by adopting a Direct Current (DC) dimming mode according to the target DBV and the DBV curve when the adjusted target DBV is higher than the target dimming switching threshold,
wherein the target dimming switching threshold is lower than a standard dimming switching threshold.
5. A luminance adjustment device, characterized by comprising:
an obtaining module, configured to obtain a DBV curve according to a corresponding relationship between a display luminance value DBV and an actual luminance value of a display device, where the DBV curve represents a corresponding relationship between the DBV and an actual luminance value corresponding to a gray scale of the display device, the DBV curve includes a first nonlinear section and a linear section, the first nonlinear section includes a second nonlinear section, a portion obtained by intercepting the DBV curve in the first nonlinear section is a nonlinear curve, an intercept point of the DBV curve in the second nonlinear section includes an origin and a first target point, the actual luminance value corresponding to the first target point is greater than or equal to a low luminance threshold, a slope of each point of the DBV curve in the second nonlinear section is smaller than a slope of a connecting line between the first target point and the origin, and the actual luminance value corresponding to each point of the DBV curve in the linear section is greater than the actual luminance value corresponding to each point of the DBV curve in the first nonlinear section A value of a luminance of the horizon;
and the adjusting module is used for adjusting the brightness of the display device according to the adjusted target DBV and the DBV curve.
6. The apparatus of claim 5, wherein the DBV and the actual brightness value of the DBV curve at each point in the second non-linear interval satisfy an exponential function relationship.
7. The apparatus of claim 5, wherein a slope of the DBV curve at each point in the linear interval is greater than a slope of the DBV curve at each point in the second non-linear interval.
8. The apparatus of claim 5, wherein the adjustment module is specifically configured to:
under the condition that the adjusted target DBV is lower than or equal to a target dimming switching threshold value, adjusting the brightness of the display device by adopting a Pulse Width Modulation (PWM) dimming mode according to the target DBV and the DBV curve;
adjusting the brightness of the display device by adopting a Direct Current (DC) dimming mode according to the target DBV and the DBV curve under the condition that the adjusted target DBV is higher than the target dimming switching threshold value,
wherein the target dimming switching threshold is lower than a standard dimming switching threshold.
9. A display device comprising a luminance adjustment device as claimed in any one of claims 5 to 8.
10. The display device according to claim 9, further comprising a light emission control signal circuit;
and the light-emitting control signal output by one light-emitting control signal circuit is used for driving a pixel driving circuit of a row of pixels.
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| CN113053312A (en) * | 2021-03-24 | 2021-06-29 | 京东方科技集团股份有限公司 | Dimming method and device of display panel |
| CN113516944B (en) * | 2021-04-01 | 2022-11-29 | 北京集创北方科技股份有限公司 | Brightness control method, device, equipment, storage medium and display screen |
| CN113326029B (en) * | 2021-05-13 | 2024-03-22 | 深圳恒之源技术股份有限公司 | LED lamp brightness adjusting method, system and computer readable storage medium |
| CN115050326B (en) * | 2022-08-15 | 2022-11-04 | 禹创半导体(深圳)有限公司 | Adaptive visible dimming method for OLED (organic light emitting diode) under strong light |
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