CN111986630A - Display brightness adjusting method and device and display device - Google Patents

Abstract

The embodiment of the invention discloses a display brightness adjusting method and device and a display device. The display brightness adjusting method comprises the following steps: setting an initial dimming conversion brightness level of the display device; determining the mura degree of a display picture of the display device between the dimming conversion brightness level and the highest display brightness level, wherein the display brightness is adjusted by adopting a PWM dimming mode in an interval formed by the lowest display brightness level and the dimming conversion brightness level, and the display brightness is adjusted by adopting a DC dimming mode in an interval formed by the dimming conversion brightness level and the highest display brightness level; and adjusting the dimming conversion brightness level according to the mura degree of the display picture to obtain the optimal dimming conversion brightness level, wherein the mura degree of the display picture between the optimal dimming conversion brightness level and the highest display brightness level of the display device meets the preset mura degree. According to the technical scheme, the probability of uneven display brightness of the display device is reduced, and the display effect of the display device is optimized.

Description

Display brightness adjusting method and device and display device

Technical Field

The embodiment of the invention relates to the technical field of display, in particular to a display brightness adjusting method and device and a display device.

Background

With the development of display technology, people have increasingly high requirements on the display effect of display devices.

Currently, the brightness adjustment method of the display device generally includes Direct Current (DC) dimming and Pulse Width Modulation (PWM) dimming. The conventional brightness adjustment mode can cause the display device to generate a phenomenon of uneven display (mura), thereby influencing the display effect.

Disclosure of Invention

The embodiment of the invention provides a display brightness adjusting method and device and a display device, which are used for dynamically adjusting dimming conversion brightness levels and optimizing the display effect of the display device.

In a first aspect, an embodiment of the present invention provides a method for adjusting display brightness, including:

setting an initial dimming conversion brightness level of the display device;

determining the mura degree of a display picture of the display device between the dimming conversion brightness level and the highest display brightness level, wherein the display brightness is adjusted by adopting a PWM dimming mode in an interval formed by the lowest display brightness level and the dimming conversion brightness level, and the display brightness is adjusted by adopting a DC dimming mode in an interval formed by the dimming conversion brightness level and the highest display brightness level;

and adjusting the dimming conversion brightness level according to the mura degree of the display picture to obtain the optimal dimming conversion brightness level, wherein the mura degree of the display picture between the optimal dimming conversion brightness level and the highest display brightness level of the display device meets the preset mura degree.

Optionally, in a display screen of the display device, when a brightness difference value of adjacent display areas is lower than a preset difference value, the mura degree of the display screen satisfies the preset mura degree.

Optionally, determining the mura degree of the display screen of the display device between the dimming conversion brightness level and the highest display brightness level comprises:

controlling the display device to display by dimming and converting the brightness level to the highest display brightness level;

acquiring an image of a display picture of the display device through an optical camera;

and determining the mura degree of a display picture of the display device between the dimming conversion brightness level and the highest display brightness level according to the image data collected by the optical camera.

Optionally, adjusting the dimming conversion brightness level according to the mura degree of the display screen to obtain an optimal dimming conversion brightness level, where the mura degree of the display screen between the optimal dimming conversion brightness level and the highest display brightness level of the display device satisfies a preset mura degree, including:

judging whether the mura degree of a display picture of the display device between the current dimming conversion brightness level and the highest display brightness level meets the preset mura degree or not;

if the mura degree of the display screen between the current dimming conversion brightness level and the highest display brightness level of the display device does not meet the preset mura degree, increasing the current dimming conversion brightness level until the mura degree of the display screen between the increased dimming conversion brightness level and the highest display brightness level of the display device meets the preset mura degree;

and if the mura degree of the display picture between the current dimming conversion brightness level and the highest display brightness level of the display device meets the preset mura degree, reducing the current dimming conversion brightness level until the next reduction of the dimming conversion brightness level, wherein the mura degree of the display picture between the dimming conversion brightness level and the highest display brightness level of the display device does not meet the preset mura degree.

In a second aspect, an embodiment of the present invention further provides a display brightness adjusting apparatus, including:

the dimming conversion brightness level setting module is used for setting the initial dimming conversion brightness level of the display device;

the mura degree determining module is used for determining the mura degree of a display picture of the display device between the dimming conversion brightness level and the highest display brightness level, wherein the display brightness is adjusted by adopting a PWM dimming mode in an interval formed by the lowest display brightness level and the dimming conversion brightness level, and the display brightness is adjusted by adopting a DC dimming mode in the interval formed by the dimming conversion brightness level and the highest display brightness level;

and the dimming conversion brightness level adjusting module is used for adjusting the dimming conversion brightness level according to the mura degree of the display picture so as to obtain the optimal dimming conversion brightness level, and the mura degree of the display picture between the optimal dimming conversion brightness level and the highest display brightness level of the display device meets the preset mura degree.

Optionally, in a display screen of the display device, when a brightness difference value of adjacent display areas is lower than a preset difference value, the mura degree of the display screen satisfies the preset mura degree.

Optionally, the mura level determining module comprises:

the display control unit is used for controlling the display device to display by dimming and converting the brightness level to the highest display brightness level;

the image acquisition unit is used for acquiring an image of a display picture of the display device through an optical camera;

and the mura degree determining unit is used for determining the mura degree of a display picture of the display device between the dimming conversion brightness level and the highest display brightness level according to the image data collected by the optical camera.

Optionally, the dimming conversion brightness level adjustment module includes:

the mura degree judging unit is used for judging whether the mura degree of a display picture of the display device between the current dimming conversion brightness level and the highest display brightness level meets the preset mura degree or not;

a first brightness level adjustment unit, configured to increase the current dimming conversion brightness level when the mura degree of the display screen of the display device between the current dimming conversion brightness level and the highest display brightness level does not satisfy a preset mura degree, until the mura degree of the display screen of the display device between the increased dimming conversion brightness level and the highest display brightness level satisfies the preset mura degree;

the first brightness level adjusting unit is used for reducing the current dimming conversion brightness level when the mura degree of the display picture between the current dimming conversion brightness level and the highest display brightness level of the display device meets a preset mura degree, and the mura degree of the display picture between the dimming conversion brightness level and the highest display brightness level of the display device does not meet the preset mura degree until the dimming conversion brightness level is reduced next time.

In a third aspect, an embodiment of the present invention further provides a display device, where the display device includes:

the dimming conversion brightness level acquisition module is used for acquiring the initial dimming conversion brightness level of the display device;

the display module is used for displaying between the dimming conversion brightness level and the highest display brightness level;

the optimal dimming conversion brightness level acquisition module is used for acquiring the optimal dimming conversion brightness level;

and the display brightness adjusting module is used for adjusting the display brightness in a PWM dimming mode in an interval formed by the lowest display brightness level and the dimming conversion brightness level, and adjusting the display brightness in a DC dimming mode in an interval formed by the dimming conversion brightness level and the highest display brightness level.

Optionally, the display device further includes a display brightness register, and a value range of the display brightness register corresponds to a display brightness level range of the display device.

According to the technical scheme, the dimming conversion brightness level is adjusted according to the mura degree of the display picture of the display device to obtain the optimal dimming conversion point, so that the display brightness of the display picture of the display device in a high-brightness interval formed by the optimal dimming conversion brightness level and the highest display brightness level is uniform, the display brightness of the display device is adjusted in the high-brightness interval in a DC dimming mode, the chromaticity and the brightness of the display picture can be guaranteed, the stroboscopic phenomenon is avoided, and mura caused by DC dimming can be avoided. The display brightness of the display device is adjusted by adopting a DC dimming mode in a low-brightness interval formed by the lowest display brightness level and the optimal dimming conversion brightness level, so that the chromaticity and the brightness of a display picture can be ensured, the stroboscopic phenomenon is avoided, and mura caused by DC dimming can be avoided. According to the technical scheme, the mura phenomenon caused by setting the fixed dimming conversion point in the prior art can be avoided, the probability of the display device generating the display brightness non-uniformity phenomenon in the whole dimming interval is reduced, and the display effect of the display device is optimized.

Drawings

Fig. 1 is a schematic flowchart of a method for adjusting display brightness according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a 7T1C pixel circuit in the prior art;

FIG. 3 is a flow chart of another method for adjusting display brightness according to an embodiment of the present invention;

FIG. 4 is a flowchart illustrating another method for adjusting display brightness according to an embodiment of the present invention;

FIG. 5 is a flowchart illustrating another method for adjusting display brightness according to an embodiment of the present invention;

fig. 6 is a schematic block diagram of a display brightness adjusting apparatus according to an embodiment of the present invention;

fig. 7 is a schematic block diagram of a display device according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

As described in the background, the brightness adjustment method of the conventional display device may cause the display device to generate display mura (mura), thereby affecting the display effect. The inventors found that the above problems occur due to the following reasons: in the existing brightness adjusting mode, the DC dimming is applied to obtain better color and brightness accuracy, and a stroboscopic phenomenon does not occur, but obvious mura is generated in a low-brightness interval. Applying PWM dimming can improve mura but tends to cause color cast in the display screen. At present, a dimming mode of mixing DC dimming and PWM dimming is mostly used in the industry, a part of samples are selected, the state of a screen body is actually measured, and a fixed dimming conversion point of DC dimming and PWM dimming is selected through comprehensive consideration. However, different batches of screens may have large differences, and the fixed dimming switching point scheme cannot improve mura of all screens and keep the chromaticity in the optimal state, and cannot achieve ideal effects on all screens. In the prior art, the display device is optimized by adopting a De-mura technology for mura, but an external storage device (flash) is additionally arranged in the display device by adopting the De-mura technology. In consideration of cost, some display devices are not provided with flash, and in consideration of differences among screens, parts of the screens may have serious mura performance, which affects visual experience and product yield.

In view of the foregoing problems, embodiments of the present invention provide a method for adjusting display brightness. Fig. 1 is a schematic flow chart of a method for adjusting display brightness according to an embodiment of the present invention, where the method is applicable to dynamically adjusting a dimming switching point of a display device, and the method can be executed by the display brightness adjusting device, and the method specifically includes the following steps:

and S110, setting the initial dimming conversion brightness level of the display device.

The Display device in the embodiment of the invention may be a Display device such as a mobile phone and a computer, for example, a Liquid Crystal Display (LCD), an organic light-Emitting Diode (OLED) Display device, an Active-matrix organic light-Emitting Diode (AMOLED) Display device, and the like.

Specifically, a Brightness adjustment key, by which a user changes a Display Brightness level of the Display apparatus, which is also called a Display Brightness Value (DBV), is generally included in the Display apparatus. Each display brightness level can correspond to one display brightness of the maximum gray scale in the display picture of the display device, and after the display brightness corresponding to the maximum gray scale in the display picture is changed, the display brightness corresponding to other gray scales can be changed. For example, when the display brightness corresponding to the maximum gray scale in the display frame is increased, the display brightness corresponding to other gray scales is also increased; when the display brightness corresponding to the maximum gray scale in the display picture is reduced, the display brightness corresponding to other gray scales is also reduced. That is, when the display brightness corresponding to the maximum gray scale in the display picture is larger, the brightness level is larger, and the whole display brightness of the display picture is larger; when the display brightness corresponding to the maximum gray scale in the display picture is smaller, the brightness level is smaller, and the whole display brightness of the display picture is smaller.

At least one dimming interval is generally included between the minimum value of the display brightness level (i.e., the lowest display brightness level) and the maximum value of the display brightness level (i.e., the highest display brightness level). The dimming conversion brightness level is a brightness level between the lowest display brightness level and the highest display brightness level, and the dimming conversion brightness level can be used as a boundary point of two dimming intervals, so that the lowest display brightness level to the dimming conversion brightness level form one dimming interval of the display device, and the dimming conversion brightness level to the highest display brightness level form the other dimming interval of the display device. In this embodiment, a level is selected in advance from the lowest display brightness level to the highest display brightness level as an initial value of the dimming conversion brightness level, that is, an initial dimming conversion point of the display device.

And S120, determining the mura degree of the display screen of the display device between the dimming conversion brightness level and the highest display brightness level.

Specifically, the display screen of each display brightness level in a dimming interval formed by dimming conversion brightness level and the highest display brightness level of the display device is obtained, and the mura degree of the display screen of each display brightness level is analyzed. Here, mura refers to uneven display luminance of a display screen.

For example, the mura degree of the display screen may be determined according to a difference in display brightness of adjacent display areas in the display screen of the display apparatus. Specifically, a display screen of the display device displaying the luminance level at one of the dimming conversion luminance level and the highest display luminance level is acquired, the display screen may be a monochrome display screen including a plurality of display regions, and each display region may be configured by one or more adjacent sub-pixels. And determining the display brightness value of each display area in the display picture, and calculating the difference value of the display brightness values of the adjacent display areas. The difference between the display brightness values of the adjacent display areas may reflect the mura degree of the display screen, for example, the smaller the difference between the display brightness values of the adjacent display areas is, the more uniform the display brightness of the display screen is, the smaller the mura degree of the display screen is; the larger the difference between the display luminance values of the adjacent display areas is, the more uneven the display luminance of the display screen is, and the larger the mura degree of the display screen is.

The display brightness is adjusted by adopting a PWM dimming mode in an interval formed by the lowest display brightness level and the dimming conversion brightness level, and the display brightness is adjusted by adopting a DC dimming mode in an interval formed by the dimming conversion brightness level and the highest display brightness level.

The DC dimming method adjusts the display luminance of the display device by, for example, adjusting the magnitude of a data voltage signal of a pixel circuit in the display device. Fig. 2 is a schematic diagram of a 7T1C pixel circuit in the prior art, and the DC dimming method in this embodiment will be briefly described with reference to fig. 2 as an example. As shown in fig. 2, a data voltage signal Vdata is input to the first electrode of the first transistor M1, and when the first transistor M1 is controlled to be turned on, the data voltage signal Vdata is transmitted to the lower plate of the storage capacitor C through the first transistor M1, the driving transistor DT and the fourth transistor M4, and the storage capacitor C stores the data voltage signal Vdata, so that the driving transistor DT can generate a driving current according to the data voltage signal Vdata stored in the storage capacitor C, and the light emitting device D1 is controlled to emit light. The fifth transistor M5 is connected to the gate of the driving transistor DT, the fifth transistor M5 is turned on in the initialization stage, and writes the initialization voltage Vref to the gate of the driving transistor DT, that is, the bottom plate of the storage capacitor C, to initialize the gate of the driving transistor DT and the bottom plate of the storage capacitor C, the sixth transistor M6 is connected to the anode of the light emitting device D1, and the sixth transistor M6 is turned on in the initialization stage, and writes the initialization voltage Vref to the anode of the light emitting device D1 to initialize the anode of the light emitting device D1. Here, the initializing voltage written to the gate of the driving transistor DT and the anode of the light emitting device D1 may be the same or different. The magnitude of the data voltage in the data voltage signal Vdata is related to the magnitude of the driving current, and the DC dimming mode changes the magnitude of the driving current by adjusting the magnitude of the data voltage in the data voltage signal Vdata, so as to adjust the light emitting brightness of the light emitting device D1, thereby realizing the display brightness adjustment of the display device.

The PWM dimming method adjusts the display luminance of the display device by, for example, adjusting a duty ratio of an active pulse signal, for example, a low-level pulse width duty ratio or a high-level pulse width duty ratio, of a light emission control signal of a pixel circuit in the display device. Still taking fig. 2 as an example, the PWM dimming method in the present embodiment is briefly described. As shown in fig. 2, the light emission control signal Emit is input to the gates of the second transistor M2 and the third transistor M3, and in this embodiment, the second transistor M2 and the third transistor M3 are both P-channel transistors, and a low-level signal in the light emission control signal Emit is an active signal for controlling the conduction of the second transistor M2 and the third transistor M3. When a low level signal in the emission control signal Emit arrives, the second transistor M2 and the third transistor M3 are turned on, so that the first power voltage signal VDD is transmitted to the first pole of the driving transistor DT through the second transistor M2, the second power voltage signal VSS is transmitted to the second pole, e.g., the cathode, of the light emitting device D1, and the first power voltage signal VDD and the second power voltage signal VSS serve as a power source for generating a driving current by the driving transistor DT, so that the driving transistor DT generates the driving current to drive the light emitting device D1 to Emit light. The PWM dimming mode changes the light emitting time of the light emitting device D1 in one frame by adjusting the low-level pulse width duty ratio in the light emitting control signal Emit, so as to adjust the light emitting brightness of the light emitting device D1, thereby realizing the display brightness adjustment of the display device.

The interval formed by the lowest display brightness level and the dimming conversion brightness level is compared with the interval formed by the dimming conversion brightness level and the highest display brightness level, the interval formed by the lowest display brightness level and the dimming conversion brightness level is a low brightness interval, and the interval formed by the dimming conversion brightness level and the highest display brightness level is a high brightness interval. In the embodiment, the DC dimming mode is adopted to adjust the display brightness of the display device in the high-brightness interval, so that the chromaticity and the brightness of the display screen can be ensured, the stroboscopic phenomenon can be avoided, and mura caused by the DC dimming can be avoided. Because the PWM dimming mode has the advantage of improving mura, in this embodiment, the PWM dimming mode is adopted to adjust the display brightness of the display device in the low brightness interval, so that the mura phenomenon of the display screen can be further improved, and the display effect of the display device can be improved.

And S130, adjusting the dimming conversion brightness level according to the mura degree of the display picture to obtain the optimal dimming conversion brightness level, wherein the mura degree of the display picture between the optimal dimming conversion brightness level and the highest display brightness level of the display device meets the preset mura degree.

Specifically, the preset mura degree is to judge whether the mura degree of the current display picture of the display device is an acceptable threshold degree, and if the mura degree of the current display picture of the display device meets the preset mura degree, it is indicated that the brightness of the current display picture of the display device is uniform, the display effect is good, and the mura degree is acceptable; if the mura degree of the current display picture of the display device does not meet the preset mura degree, the brightness of the current display picture of the display device is not uniform, the display effect is poor, and the mura degree is unacceptable.

Illustratively, in a display screen of the display device, when the brightness difference value of adjacent display areas is lower than a preset difference value, the mura degree of the display screen meets the preset mura degree. The preset difference value can be set according to the specification parameters of the display device and user requirements, so that whether the brightness of the display picture is uniform or not is judged according to the preset difference value. When the display picture is a monochromatic picture, the display brightness value of each display area in the display picture is determined, and the difference value of the display brightness values of the adjacent display areas is calculated. If the brightness difference value of the adjacent display areas is lower than the preset difference value, the display brightness of the current display picture is uniform, and the mura degree of the current display picture meets the preset mura degree; if the brightness difference value of the adjacent display areas is higher than or equal to the preset difference value, the display brightness of the current display picture is uneven, and the mura degree of the current display picture does not meet the preset mura degree.

Judging whether the mura degree of the display screen of the display device in the current dimming interval meets the preset mura degree according to the mura degree of the display screen of the display device between the initial dimming conversion brightness level and the highest display brightness level determined in the step S120, and adjusting the initial value of the current dimming conversion brightness level, repeatedly executing the steps S110 to S120 for multiple times, setting the dimming conversion brightness level between the lowest display brightness level and the highest display brightness level, and continuously determining the mura degree of the display frame of the display device between the dimming conversion brightness level and the highest display brightness level until determining an optimal dimming conversion brightness level, wherein the mura degree of the display frame corresponding to the optimal dimming conversion brightness level is a critical value meeting the preset mura degree.

The mura degree of the display screen between the optimal dimming conversion brightness level and the highest display brightness level of the display device meets the preset mura degree, and the mura degree of the display screen between the lowest display brightness level and the optimal dimming conversion brightness level does not meet the preset mura degree. The dimming interval composed of the lowest display brightness level and the optimal dimming conversion brightness level is a low brightness interval, and the dimming interval composed of the optimal dimming conversion brightness level and the highest display brightness level is a high brightness interval, compared with the dimming interval composed of the optimal dimming conversion brightness level and the highest display brightness level. In the low-brightness interval, the mura degree of the display frame of the display device does not meet the preset mura degree, and the PWM dimming mode has the advantage of improving the mura, so that the brightness of the display device is adjusted by adopting the PWM dimming mode in the low-brightness interval, and the mura degree of the display device in the low-brightness interval can be improved. In the high-brightness interval, the mura degree of the display picture of the display device meets the preset mura degree, because the DC dimming mode has the chromaticity and the brightness accuracy of the display picture, the advantage of avoiding the occurrence of the stroboscopic phenomenon, and the defect of producing the mura in the low-brightness interval, the DC dimming mode is adopted to display the brightness of the display device in the high-brightness interval, the chromaticity and the brightness of the display picture can be ensured, the stroboscopic phenomenon is avoided, and the mura caused by the DC dimming can be avoided. When the DC dimming and the PWM dimming are adopted for mixed dimming in the prior art, individual differences of display devices are not considered, and the same dimming conversion points are only set for products in the same batch, so that serious mura phenomenon can be generated on part of the display devices. The technical scheme of this embodiment, can avoid prior art because of setting up the mura phenomenon that fixed dimming transition point produced, according to individual display device's display screen's mura degree, carry out dynamic adjustment to dimming transition point, adopt PWM to dim light in unsatisfied low luminance interval of presetting the mura degree, adopt DC to dim light in the high luminance interval that satisfies the preset mura degree, reduced display device and produced the probability of the uneven phenomenon of display luminance in whole dimming interval, optimized display device's display effect. In addition, in the prior art, the De-mura scheme for improving the mura phenomenon of the display device needs to additionally add an external storage device in the display device, and the technical scheme of the embodiment can also play a role in improving the uneven display brightness without additionally arranging an external storage device in the display device, thereby saving the production cost of the display device.

In one embodiment of the present invention, the display device includes a display brightness register, and a value range of the display brightness register corresponds to a display brightness level range of the display device. Illustratively, the display brightness register may be a register in a main board of the display device, for example, a register 51, a value range of the register 51 includes 0 to 0xFF, a display brightness level range of the display device includes a lowest display brightness level L to a highest display brightness level M, and the lowest display brightness level L to the highest display brightness level M form a dimming interval of the display device, that is, a value range interval [0, 0xFF ] of the register 51 corresponds to the dimming interval [ L, M ] of the display device. The user sets 51 the register value by setting the display brightness level via a brightness adjustment key in the display device. The processing unit in the display device may obtain 51 the value of the register to determine the current display brightness level of the display device, and control the display device to display according to the display brightness level and the image information to be displayed. In this embodiment, when the initial dimming conversion brightness level of the display device is set, the initial dimming conversion brightness level may be a, and may be implemented by setting a value of a register 51 as a, where a belongs to [0, 0xFF ]. Thus, the dimming interval [ L, a ] formed from the lowest display luminance level L to the dimming conversion luminance level a corresponds to the value range [0, a ] of the register 51, and the dimming interval [ a, M ] of the route from the dimming conversion luminance level a to the highest display luminance level M corresponds to the value range [ a, 0xFF ] of the register 51. When the dimming conversion brightness level A is adjusted according to the mura degree of the display picture to obtain the optimal dimming conversion brightness level, the value of the initial dimming conversion point a can be changed to enable the mura degree of the display picture between the optimal dimming conversion brightness level and the highest display brightness level of the display device to meet the preset mura degree, namely the mura degree of the display picture meets the preset mura degree in the dimming interval corresponding to the value range interval [ a, 0xFF ] of the 51 register of the display device by adjusting the a.

Fig. 3 is a schematic flow chart of another display brightness adjustment method according to an embodiment of the present invention, and the present embodiment further optimizes the determination method of the mura degree of the display screen in the foregoing embodiment on the basis of the foregoing embodiment. Correspondingly, as shown in fig. 3, the method of the present embodiment specifically includes:

and S210, setting the initial dimming conversion brightness level of the display device.

And S220, controlling the display device to display by dimming the conversion brightness level to the highest display brightness level.

Specifically, the display device is controlled to perform display at each display brightness level between the dimming conversion brightness level and the highest display brightness level, and the picture displayed by the display device at each display brightness level can be a monochrome picture so as to judge the mura degree of the display picture.

And S230, acquiring an image of a display picture of the display device through the optical camera.

For example, the optical camera may be a Charge Coupled Device (CCD) camera, and the display Device is controlled to display each display brightness level between the dimming conversion brightness level and the highest display brightness level, and the display screen at each display brightness level of the display Device is photographed by the optical camera to acquire image data of the display screen at each display brightness level.

And S240, determining the mura degree of the display frame of the display device between the dimming conversion brightness level and the highest display brightness level according to the image data collected by the optical camera.

Specifically, the mura degree of the display screen at each display luminance level is determined based on image data of the display screen at each display luminance level between the dimming conversion luminance level and the highest display luminance level of the display device collected by the optical camera. Specifically, the display brightness of each display area in the display picture can be determined, and the difference value of the display brightness of the adjacent display areas can be calculated, so that the mura degree of the display picture can be determined according to the size of the difference value of the display brightness of the adjacent display areas.

And S250, adjusting the dimming conversion brightness level according to the mura degree of the display picture to obtain the optimal dimming conversion brightness level, wherein the mura degree of the display picture between the optimal dimming conversion brightness level and the highest display brightness level of the display device meets the preset mura degree.

According to the technical scheme, the display device is controlled to display each display brightness level between the dimming conversion brightness level and the highest display brightness level, the optical camera is used for collecting images of each display picture of the display device, the mura degree of the display picture between the dimming conversion brightness level and the highest display brightness level of the display device is determined according to the image data collected by the optical camera, whether the mura degree meets the preset mura degree or not is determined, the dimming conversion brightness level is adjusted according to the mura degree of the display picture, the optimal dimming conversion brightness level is obtained, and the mura degree of the display picture between the optimal dimming conversion brightness level and the highest display brightness level of the display device meets the preset mura degree. In the dimming interval formed by the optimal dimming conversion brightness level meeting the preset mura degree and the highest display brightness level, the display brightness of the display device is adjusted by adopting a DC dimming mode, so that the chromaticity and the brightness of a display picture can be ensured, the stroboscopic phenomenon is avoided, and mura caused by DC dimming can be avoided. In the dimming interval formed by the lowest display brightness level which does not meet the preset mura degree and the optimal dimming conversion brightness level, the display brightness of the display device is adjusted by adopting a PWM dimming mode, the mura degree of the display device in the dimming interval can be improved, the probability of uneven display brightness generated in the whole dimming interval by the display device is reduced, and the display effect of the display device is optimized.

Fig. 4 is a schematic flow chart of another display brightness adjustment method according to an embodiment of the present invention, which further optimizes the adjustment method of the optimal dimming conversion brightness level in the foregoing embodiment based on the foregoing embodiment. Correspondingly, as shown in fig. 4, the method of the present embodiment specifically includes:

and S310, setting the initial dimming conversion brightness level of the display device.

And S320, determining the mura degree of the display screen of the display device between the dimming conversion brightness level and the highest display brightness level.

The display brightness is adjusted by adopting a PWM dimming mode in an interval formed by the lowest display brightness level and the dimming conversion brightness level, and the display brightness is adjusted by adopting a DC dimming mode in an interval formed by the dimming conversion brightness level and the highest display brightness level.

S330, judging whether the mura degree of the display picture of the display device between the current dimming conversion brightness level and the highest display brightness level meets the preset mura degree.

Exemplarily, assuming that the current dimming conversion brightness level is a, the lowest display brightness level is L, and the highest display brightness level is M, a value range of a 51 register in the display device includes 0 to 0xFF, a value range interval [0, 0xFF ] of the 51 register corresponds to a dimming interval [ L, M ] formed by the lowest display brightness level L to the highest display brightness level M of the display device, and a value a of the 51 register corresponding to the current dimming conversion brightness level a. And judging whether the mura degree of the display picture meets the preset mura degree or not within a dimming interval [ A, M ] formed by the current dimming conversion brightness level A to the highest display brightness level M of the display device, namely within the dimming interval formed by the value range interval [ a, 0xFF ] of the 51 register of the display device.

If the mura degree of the display screen between the current dimming conversion brightness level and the highest display brightness level of the display device does not meet the preset mura degree, executing step S340; if the mura degree of the display screen between the current dimming conversion brightness level and the highest display brightness level of the display device satisfies the preset mura degree, step S350 is executed.

And S340, increasing the current dimming conversion brightness level until the mura degree of the display picture between the increased dimming conversion brightness level and the highest display brightness level of the display device meets the preset mura degree.

If the mura degree of the display picture does not meet the preset mura degree in the dimming interval [ A, M ] formed by the current dimming conversion brightness level A and the highest display brightness level M, the current dimming conversion brightness level A is increased to enable A to be A + B, wherein B is larger than 0. For example, the value a of the register 51 is set to be a + B, where B > 0, so that the display brightness level corresponding to the value a + B of the register 51 is greater than the display brightness level corresponding to the value a of the register 51, and the value a of the register 51 is increased to a + B, which is equivalent to increasing the current dimming conversion brightness level a to a + B. And in the dimming interval [ A, M ], when the mura degree of the display picture does not meet the preset mura degree, increasing the current dimming conversion brightness level A, namely increasing the PWM dimming interval [ L, A ] of the display device, so that the uneven display brightness of the display picture of the display device generated in the dimming interval [ L, A ] is improved through PWM dimming.

After the dimming conversion brightness level is increased from a to a + B, the step S330 is repeatedly executed, and it is continuously determined whether the mura degree of the display screen satisfies the preset mura degree in the dimming interval [ a + B, M ] formed by the current dimming conversion brightness level a + B to the highest display brightness level M of the display device until the dimming conversion brightness level is increased to such an extent that the mura degree of the display screen between the dimming conversion brightness level and the highest display brightness level satisfies the preset mura degree. That is, the mura degree of the display screen corresponding to the increased optimal dimming conversion brightness level is a critical value satisfying the preset mura degree, the mura degree of the display screen in the dimming interval formed by the lowest dimming conversion brightness level L to the optimal dimming conversion brightness level does not satisfy the preset mura degree, and the mura degree of the display screen in the dimming interval formed by the optimal dimming conversion brightness level to the highest dimming conversion brightness level satisfies the preset mura degree.

And S350, reducing the current dimming conversion brightness level until the dimming conversion brightness level is reduced next time, wherein the mura degree of the display picture between the dimming conversion brightness level and the highest display brightness level of the display device does not meet the preset mura degree.

If the mura degree of the display picture meets the preset mura degree in the dimming interval [ A, M ] formed by the current dimming conversion brightness level A and the highest display brightness level M, the current dimming conversion brightness level A is reduced to make A equal to A-B, wherein B is larger than 0. For example, the value a of the register 51 is set to be a-B, where B is greater than 0, so that the display brightness level corresponding to the value a-B of the register 51 is lower than the display brightness level corresponding to the value a of the register 51, and the value a of the register 51 is reduced to a-B, that is, the current dimming conversion brightness level a is reduced to a-B. In the dimming interval [ A, M ], when the mura degree of the display picture meets the preset mura degree, the current dimming conversion brightness level A is reduced, namely the DC dimming interval [ A, M ] of the display device is increased, so that DC dimming is adopted in the dimming interval with uniform display brightness, the display picture can be kept at better brightness and chromaticity, and uneven display brightness caused by DC dimming in the interval can be avoided.

And after the dimming conversion brightness level is reduced from A to A-B, the step S330 is repeatedly executed, whether the mura degree of the display picture meets the preset mura degree or not is continuously judged in a dimming interval [ A-B, M ] formed by the current dimming conversion brightness level A-B to the highest display brightness level M of the display device, and the reduction of the current dimming conversion brightness level is stopped when the mura degree of the display picture between the dimming conversion brightness level and the highest display brightness level does not meet the preset mura degree until the dimming conversion brightness level is reduced next time. That is, the mura degree of the display screen corresponding to the reduced optimal dimming conversion brightness level is a critical value satisfying the preset mura degree, the mura degree of the display screen in the dimming interval formed by the lowest dimming conversion brightness level L to the optimal dimming conversion brightness level does not satisfy the preset mura degree, and the mura degree of the display screen in the dimming interval formed by the optimal dimming conversion brightness level to the highest dimming conversion brightness level satisfies the preset mura degree.

In this embodiment, in the dimming interval formed by the optimal dimming conversion luminance level satisfying the preset mura degree to the highest display luminance level, the display luminance of the display device is adjusted by using the DC dimming mode, so that the chromaticity and luminance of the display screen can be ensured, the stroboscopic phenomenon can be avoided, and mura caused by DC dimming can be avoided. In the dimming interval formed by the lowest display brightness level which does not meet the preset mura degree and the optimal dimming conversion brightness level, the display brightness of the display device is adjusted by adopting a PWM dimming mode, the mura degree of the display device in the dimming interval can be improved, the probability of uneven display brightness generated in the whole dimming interval by the display device is reduced, and the display effect of the display device is optimized.

Fig. 5 is a schematic flowchart of another display brightness adjustment method according to an embodiment of the present invention, which is a specific example of the display brightness adjustment method. As shown in fig. 5, the method of the present embodiment includes:

and S410, loading an initialization code containing the initial dimming conversion point a into the display device to light the screen body.

Specifically, the initialization code includes a code for controlling a dimming mode of the display device, the initial dimming transition point a corresponds to one of values in a value range of 0 to 0xFF of a 51 register in the display device, and the value range of 0 to 0xFF of the 51 register corresponds to a dimming interval formed by a lowest display brightness level to a highest display brightness level of the display device. The initial dimming conversion point a corresponds to one of the ranges of values of the display luminance level from a. And loading an initialization code containing an initial dimming conversion point a into the display device to light a screen body of the display device, so that the screen body is displayed at a display brightness level corresponding to a value range a-0 xFF corresponding to the 51 register.

And S420, judging whether the mura degree of the display image corresponding to the value range a-0 xFF of the 51 register is acceptable or not through the CCD optical camera.

If the mura degree of the display picture corresponding to the value range a-0 xFF of the 51 register is not acceptable, executing S430; if the mura degree of the display screen corresponding to the range a-0 xFF of the 51 register is acceptable, S440 is executed.

Specifically, a CCD optical camera is used for respectively acquiring each display picture corresponding to the numeric area a-0 xFF of the screen body in the 51 register for image acquisition, and the mura degree of each display picture in the numeric area is judged according to the image data acquired by the CCD optical camera. Exemplarily, if the mura degree of the display screen does not satisfy the preset mura degree, the mura degree of the display screen is unacceptable, that is, the display brightness of the display screen is not uniform at this time; and if the mura degree of the display frame meets the preset mura degree, the mura degree of the display frame is acceptable, namely the display brightness of the display frame is uniform at the moment. Whether the mura degree of the display picture meets the preset mura degree can be judged according to whether the difference value of the display brightness of the adjacent display areas in the display picture is lower than the preset difference value. When the difference value of the display brightness of the adjacent display areas in the display picture is lower than a preset difference value, the display brightness of the display picture is uniform, the mura degree of the display picture meets the preset mura degree, and the mura degree of the display picture is acceptable; in the display picture, when the difference value of the display brightness of the adjacent display areas is larger than or equal to the preset difference value, the display brightness of the display picture is uneven, the mura degree of the display picture does not meet the preset mura degree, and the mura degree of the display picture is unacceptable.

And S430, increasing the value of the initial dimming conversion point a to reduce the DC dimming interval of the display device.

If the mura degree of the display image corresponding to the value range a-0 xFF of the 51 register is not acceptable, increasing the value of the initial dimming conversion point a, returning to execute S410-S420 to light the screen body by the increased dimming conversion point a, and judging the mura degree of the display image corresponding to the value range a-0 xFF of the 51 register through the CCD optical camera until the increased dimming conversion point a enables the mura degree of the display image corresponding to the value range a-0 xFF of the 51 register to be acceptable. Namely, the DC dimming interval of the display device is reduced until the mura degree of the display picture corresponding to the value range a-0 xFF of the 51 register is acceptable.

And S440, reducing the value of the initial dimming conversion point a to increase the DC dimming interval of the display device.

If the mura degree of the display picture corresponding to the value range a-0 xFF of the 51 register is acceptable, the method returns to execute S410-S420 after the value of the initial dimming conversion point a is reduced, so that the reduced dimming conversion point a lights the screen body, and the mura degree of the display picture corresponding to the value range a-0 xFF of the 51 register is judged through the CCD optical camera until the next reduction of the dimming conversion point a, so that the reduction of the dimming conversion point a is stopped when the mura degree of the display picture corresponding to the value range a-0 xFF of the 51 register is unacceptable. That is, the DC dimming interval of the display device is increased, and the increase of the DC dimming interval of the display device is stopped before the mura degree of the display screen corresponding to the range a to 0xFF of the register 51 is unacceptable.

And S450, setting the dimming conversion point a as the optimal dimming conversion point, and writing the optimal dimming conversion point into an initialization code of the display device.

Through the steps S430 and S440, after the dimming conversion point a is dynamically adjusted according to the mura degree of the display screen, the dimming conversion point a is made to correspond to a critical value that the mura degree of the display screen is acceptable, so that the mura degree of the display screen is unacceptable in the dimming interval corresponding to the value range 0-a of the 51 register, and the mura degree of the display screen is acceptable in the dimming interval corresponding to the value range a-0 xFF of the 51 register. The value of the 51 register corresponding to the optimal dimming conversion point is written into an initialization code of the display device, and the initialization code is once burned into the display device to control the display device to perform display brightness adjustment on the display device in a dimming interval with acceptable mura degree by adopting a DC dimming mode, so that the chromaticity and the brightness of a display picture can be ensured, the stroboscopic phenomenon is avoided, and mura caused by DC dimming can be avoided. The display device is controlled to display brightness in the dimming interval with unacceptable mura degree, the PWM dimming mode is adopted to adjust the brightness of the display device, the mura degree of the display device in the dimming interval can be improved, the probability of uneven display brightness generated in the whole dimming interval by the display device is reduced, and the display effect of the display device is optimized.

Fig. 6 is a schematic block diagram of a display brightness adjusting apparatus according to an embodiment of the present invention, which is applicable to dynamically adjusting a dimming switching point of a display apparatus. The display brightness adjusting device provided by the embodiment of the invention can execute the display brightness adjusting method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the executing method.

As shown in fig. 6, the display brightness adjusting apparatus specifically includes a dimming conversion brightness level setting module 610, a mura degree determining module 620, and a dimming conversion brightness level adjusting module 630, wherein:

the dimming conversion brightness level setting module is used for setting the initial dimming conversion brightness level of the display device;

the mura degree determining module is used for determining the mura degree of a display picture of the display device between the dimming conversion brightness level and the highest display brightness level, wherein the display brightness is adjusted in a PWM dimming mode in an interval formed by the lowest display brightness level and the dimming conversion brightness level, and the display brightness is adjusted in a DC dimming mode in an interval formed by the dimming conversion brightness level and the highest display brightness level;

the dimming conversion brightness level adjusting module is used for adjusting the dimming conversion brightness level according to the mura degree of the display picture to obtain the optimal dimming conversion brightness level, and the mura degree of the display picture between the optimal dimming conversion brightness level and the highest display brightness level of the display device meets the preset mura degree.

The display brightness adjusting device provided by the embodiment of the invention can execute the display brightness adjusting method provided by any embodiment of the invention, has the corresponding functional modules and beneficial effects of the execution method, and is not described again.

In an embodiment of the present invention, in a display screen of the display device, when a brightness difference value of adjacent display areas is lower than a preset difference value, a mura degree of the display screen satisfies a preset mura degree.

In one embodiment of the present invention, the mura level determining module includes a display control unit, an image acquisition unit, and a mura level determining unit, wherein:

the display control unit is used for controlling the display device to display by dimming conversion brightness level to the highest display brightness level;

the image acquisition unit is used for acquiring images of display pictures of the display device through the optical camera;

the mura degree determining unit is used for determining the mura degree of a display picture of the display device between the dimming conversion brightness level and the highest display brightness level according to the image data collected by the optical camera.

In an embodiment of the present invention, the dimming conversion brightness level adjustment module includes a mura degree determination unit, a first brightness level adjustment unit, and a first brightness level adjustment unit, wherein:

the mura degree judging unit is used for judging whether the mura degree of a display picture of the display device between the current dimming conversion brightness level and the highest display brightness level meets the preset mura degree or not;

the first brightness level adjusting unit is used for increasing the current dimming conversion brightness level when the mura degree of the display picture between the current dimming conversion brightness level and the highest display brightness level of the display device does not meet the preset mura degree until the mura degree of the display picture between the increased dimming conversion brightness level and the highest display brightness level of the display device meets the preset mura degree;

the first brightness level adjusting unit is used for reducing the current dimming conversion brightness level when the mura degree of the display picture between the current dimming conversion brightness level and the highest display brightness level of the display device meets the preset mura degree, and the mura degree of the display picture between the dimming conversion brightness level and the highest display brightness level of the display device does not meet the preset mura degree until the dimming conversion brightness level is reduced next time.

The display brightness adjusting device provided by the embodiment of the invention can execute the display brightness adjusting method provided by any embodiment of the invention, has the corresponding functional modules and beneficial effects of the execution method, and is not described again.

The embodiment of the invention also provides a display device, and the display brightness adjusting method and the display brightness adjusting device provided by any embodiment of the invention can control the display device provided by the embodiment of the invention. The Display device in the embodiment of the invention may be a Display device such as a mobile phone and a computer, for example, a Liquid Crystal Display (LCD), an organic light-Emitting Diode (OLED) Display device, an Active-matrix organic light-Emitting Diode (AMOLED) Display device, and the like. Fig. 7 is a schematic block diagram of a display device according to an embodiment of the present invention, as shown in fig. 7, the display device includes a dimming conversion brightness level obtaining module 710, a display module 720, an optimal dimming conversion brightness level obtaining module 730, and a display brightness adjusting module 740, where:

the dimming conversion brightness level obtaining module 710 is configured to obtain an initial dimming conversion brightness level of the display device;

the display module 720 is used for displaying between the dimming conversion brightness level and the highest display brightness level;

the optimal dimming conversion brightness level obtaining module 730 is configured to obtain an optimal dimming conversion brightness level;

the display brightness adjusting module 740 is configured to adjust the display brightness by using a PWM dimming method in an interval formed by the lowest display brightness level and the dimming conversion brightness level, and adjust the display brightness by using a DC dimming method in an interval formed by the dimming conversion brightness level and the highest display brightness level.

In this embodiment, after the display brightness adjusting apparatus sets the initial dimming conversion brightness level of the display apparatus, the display apparatus obtains the initial dimming conversion brightness level through the dimming conversion brightness level obtaining module 710, and displays between the initial dimming conversion brightness level and the highest display brightness level according to the initial dimming conversion brightness level through the display module 720, so that the display brightness adjusting apparatus performs image acquisition on the display screen of the display apparatus through the optical camera. The display brightness adjusting device determines the mura degree of a display picture of the display device between the dimming conversion brightness level and the highest display brightness level according to image data collected by the optical camera, and adjusts the dimming conversion brightness level according to the mura degree of the display picture to obtain the optimal dimming conversion brightness level, so that the mura degree of the display picture of the display device between the optimal dimming conversion brightness level and the highest display brightness level meets the preset mura degree. The display device obtains the optimal dimming conversion brightness level through the optimal dimming conversion brightness level obtaining module 730, and performs display brightness adjustment by using the display brightness adjusting module 740 in a PWM dimming manner in an interval formed by the lowest display brightness level and the dimming conversion brightness level, and performs display brightness adjustment by using a DC dimming manner in an interval formed by the dimming conversion brightness level and the highest display brightness level.

According to the technical scheme of the embodiment, the dimming conversion brightness level is adjusted according to the mura degree of the display picture of the display device, so that the optimal dimming conversion point is obtained, the display brightness of the display picture of the display device in the high-brightness interval formed by the optimal dimming conversion brightness level and the highest display brightness level is uniform, the display brightness of the display device is adjusted in the high-brightness interval in a DC dimming mode, the chromaticity and the brightness of the display picture can be guaranteed, the stroboscopic phenomenon is avoided, and mura caused by DC dimming can be avoided. The display brightness of the display device is adjusted by adopting a DC dimming mode in a low-brightness interval formed by the lowest display brightness level and the optimal dimming conversion brightness level, so that the chromaticity and the brightness of a display picture can be ensured, the stroboscopic phenomenon is avoided, and mura caused by DC dimming can be avoided. According to the technical scheme, the mura phenomenon caused by setting the fixed dimming conversion point in the prior art can be avoided, the probability of the display brightness unevenness phenomenon generated in the whole dimming interval of the display device is reduced, and the display effect of the display device is optimized.

In one embodiment of the present invention, the display device includes a display brightness register, and a value range of the display brightness register corresponds to a display brightness level range of the display device. Illustratively, the display brightness register may be a register in a main board of the display device, for example, a register 51, a value range of the register 51 includes 0 to 0xFF, a display brightness level range of the display device includes a lowest display brightness level L to a highest display brightness level M, and the lowest display brightness level L to the highest display brightness level M form a dimming interval of the display device, that is, a value range interval [0, 0xFF ] of the register 51 corresponds to the dimming interval [ L, M ] of the display device. The user sets 51 the register value by setting the display brightness level via a brightness adjustment key in the display device. The processing unit in the display device may obtain 51 the value of the register to determine the current display brightness level of the display device, and control the display device to display according to the display brightness level and the image information to be displayed.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A display brightness adjustment method is characterized by comprising the following steps:

setting an initial dimming conversion brightness level of the display device;

determining the mura degree of a display picture of the display device between the dimming conversion brightness level and the highest display brightness level, wherein the display brightness is adjusted by adopting a PWM dimming mode in an interval formed by the lowest display brightness level and the dimming conversion brightness level, and the display brightness is adjusted by adopting a DC dimming mode in an interval formed by the dimming conversion brightness level and the highest display brightness level;

and adjusting the dimming conversion brightness level according to the mura degree of the display picture to obtain the optimal dimming conversion brightness level, wherein the mura degree of the display picture between the optimal dimming conversion brightness level and the highest display brightness level of the display device meets the preset mura degree.

2. The method according to claim 1, wherein the mura degree of the display screen satisfies the predetermined mura degree when a luminance difference between adjacent display areas in the display screen of the display device is lower than a predetermined difference.

3. The method of claim 1, wherein determining the mura level of the display between the dimming converted brightness level and a maximum display brightness level of the display device comprises:

controlling the display device to display by dimming and converting the brightness level to the highest display brightness level;

acquiring an image of a display picture of the display device through an optical camera;

and determining the mura degree of a display picture of the display device between the dimming conversion brightness level and the highest display brightness level according to the image data collected by the optical camera.

4. The method as claimed in claim 1, wherein the adjusting the dimming conversion brightness level according to the mura degree of the display screen to obtain an optimal dimming conversion brightness level, and the displaying device satisfies a predetermined mura degree between the optimal dimming conversion brightness level and the highest display brightness level, comprises:

judging whether the mura degree of a display picture of the display device between the current dimming conversion brightness level and the highest display brightness level meets the preset mura degree or not;

if the mura degree of the display screen between the current dimming conversion brightness level and the highest display brightness level of the display device does not meet the preset mura degree, increasing the current dimming conversion brightness level until the mura degree of the display screen between the increased dimming conversion brightness level and the highest display brightness level of the display device meets the preset mura degree;

and if the mura degree of the display picture between the current dimming conversion brightness level and the highest display brightness level of the display device meets the preset mura degree, reducing the current dimming conversion brightness level until the next reduction of the dimming conversion brightness level, wherein the mura degree of the display picture between the dimming conversion brightness level and the highest display brightness level of the display device does not meet the preset mura degree.

5. A display luminance adjustment apparatus, comprising:

the dimming conversion brightness level setting module is used for setting the initial dimming conversion brightness level of the display device;

the mura degree determining module is used for determining the mura degree of a display picture of the display device between the dimming conversion brightness level and the highest display brightness level, wherein the display brightness is adjusted by adopting a PWM dimming mode in an interval formed by the lowest display brightness level and the dimming conversion brightness level, and the display brightness is adjusted by adopting a DC dimming mode in the interval formed by the dimming conversion brightness level and the highest display brightness level;

and the dimming conversion brightness level adjusting module is used for adjusting the dimming conversion brightness level according to the mura degree of the display picture so as to obtain the optimal dimming conversion brightness level, and the mura degree of the display picture between the optimal dimming conversion brightness level and the highest display brightness level of the display device meets the preset mura degree.

6. The apparatus according to claim 5, wherein the mura degree of the display screen satisfies the predetermined mura degree when a brightness difference between adjacent display areas in the display screen of the display apparatus is lower than a predetermined difference.

7. The display brightness adjustment apparatus according to claim 5, wherein the mura level determination module comprises:

the display control unit is used for controlling the display device to display by dimming and converting the brightness level to the highest display brightness level;

the image acquisition unit is used for acquiring an image of a display picture of the display device through an optical camera;

and the mura degree determining unit is used for determining the mura degree of a display picture of the display device between the dimming conversion brightness level and the highest display brightness level according to the image data collected by the optical camera.

8. The display brightness adjustment apparatus according to claim 5, wherein the dimming conversion brightness level adjustment module comprises:

the mura degree judging unit is used for judging whether the mura degree of a display picture of the display device between the current dimming conversion brightness level and the highest display brightness level meets the preset mura degree or not;

a first brightness level adjustment unit, configured to increase the current dimming conversion brightness level when the mura degree of the display screen of the display device between the current dimming conversion brightness level and the highest display brightness level does not satisfy a preset mura degree, until the mura degree of the display screen of the display device between the increased dimming conversion brightness level and the highest display brightness level satisfies the preset mura degree;

the first brightness level adjusting unit is used for reducing the current dimming conversion brightness level when the mura degree of the display picture between the current dimming conversion brightness level and the highest display brightness level of the display device meets a preset mura degree, and the mura degree of the display picture between the dimming conversion brightness level and the highest display brightness level of the display device does not meet the preset mura degree until the dimming conversion brightness level is reduced next time.

9. A display device, comprising:

the dimming conversion brightness level acquisition module is used for acquiring the initial dimming conversion brightness level of the display device;

the display module is used for displaying between the dimming conversion brightness level and the highest display brightness level;

the optimal dimming conversion brightness level acquisition module is used for acquiring the optimal dimming conversion brightness level;

and the display brightness adjusting module is used for adjusting the display brightness in a PWM dimming mode in an interval formed by the lowest display brightness level and the dimming conversion brightness level, and adjusting the display brightness in a DC dimming mode in an interval formed by the dimming conversion brightness level and the highest display brightness level.

10. The display device according to claim 9, further comprising a display brightness register having a range of values corresponding to a range of display brightness levels of the display device.

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