CN112259052B - Brightness adjustment method, brightness adjustment device and display device - Google Patents

Abstract

The invention provides a brightness adjustment method, a brightness adjustment device and a display device, and relates to the technical field of display. The present invention obtains the minimum display brightness value of the display panel within one frame time and the display brightness value at the target moment within one frame time; according to the minimum display brightness value and the display brightness value at the target moment, the duty ratio corresponding to the target moment is determined coefficient; according to the duty cycle coefficient and the original duty cycle of the PWM signal, determine the target duty cycle of the PWM signal at the target time; send the target duty cycle to the backlight module, so that the backlight module can be based on the target The duty cycle adjusts the pulse width modulation signal corresponding to the target time. By determining the target duty cycle at the target time, and adjusting the pulse width modulation signal at the target time according to the target duty cycle, the display brightness value through the display panel within one frame can be kept consistent, the flickering phenomenon can be eliminated, and , the process of improving the flicker of the display panel is simple.

Description

Brightness adjustment method, brightness adjustment device and display device

technical field

The present invention relates to the field of display technology, in particular to a brightness adjustment method, a brightness adjustment device and a display device.

Background technique

With the continuous development of display technology, how to reduce the power consumption of the display device is a problem worthy of attention. In order to reduce the power consumption, it can be achieved by reducing the refresh frequency of the display panel. However, after the refresh frequency is reduced, it is easy to cause the display panel to appear flicker (flicker).

At present, in order to improve the flicker of a display panel at a low refresh frequency, improvement and optimization are usually carried out in terms of materials and processes for manufacturing the display panel.

However, improving the flicker of the display panel at a low refresh rate by improving the material and process of the display panel usually requires a long test time, and the improvement process is complicated. At 20Hz, even with adjustments made in terms of materials and workmanship, the display panel will still exhibit noticeable flickering.

SUMMARY OF THE INVENTION

The present invention provides a brightness adjustment method, a brightness adjustment device and a display device, so as to solve the existing problems of improving the flicker of a display panel from the aspects of materials and processes under a low refresh frequency, and the process is complicated, and when the refresh frequency is further reduced, the display The panel still has issues with flickering.

In order to solve the above problems, the present invention discloses a brightness adjustment method, which is applied to a backlight module, and the method includes:

Obtain the minimum display brightness value of the display panel within one frame time and the display brightness value at the target time within the one frame time; the target time is any time within the one frame time;

According to the minimum display brightness value and the display brightness value at the target moment, determine the duty cycle coefficient corresponding to the target moment;

determining the target duty cycle of the pulse width modulation signal at the target moment according to the duty cycle coefficient and the original duty cycle of the pulse width modulation signal;

The target duty cycle is sent to the backlight module, so that the backlight module adjusts the pulse width modulation signal corresponding to the target time according to the target duty cycle.

Optionally, the step of determining the duty cycle coefficient corresponding to the target moment according to the minimum display brightness value and the display brightness value at the target moment includes:

The ratio of the minimum display brightness value to the display brightness value at the target time is determined as the duty cycle coefficient corresponding to the target time.

Optionally, the step of determining the target duty cycle of the PWM signal at the target moment according to the duty cycle factor and the original duty cycle of the PWM signal includes:

The product of the duty cycle factor and the original duty cycle of the pulse width modulation signal is determined as the target duty cycle of the pulse width modulation signal at the target moment.

Optionally, after the step of acquiring the minimum display brightness value of the display panel within one frame time and the display brightness value at the target moment within the one frame time, further comprising:

determining the target display brightness value that the display panel needs to achieve at each moment in the one frame time;

Determine the target maximum backlight brightness value of the backlight module according to the target display brightness value, the original maximum backlight brightness value of the backlight module, and the minimum display brightness value;

Sending the target maximum backlight brightness value to the backlight module, so that the backlight module emits light according to the target maximum backlight brightness value.

Optionally, the step of determining the target maximum backlight brightness value of the backlight module according to the target display brightness value, the original maximum backlight brightness value of the backlight module and the minimum display brightness value includes:

Calculate the product of the target display brightness value and the original maximum backlight brightness value of the backlight module;

The ratio of the product to the minimum display brightness value is determined as the target maximum backlight brightness value of the backlight module.

In order to solve the above problems, the present invention also discloses a brightness adjustment device, which is applied to a backlight module, and the device includes:

The display brightness value acquisition module is configured to acquire the minimum display brightness value of the display panel in one frame time and the display brightness value at the target time in the one frame time; the target time is any value in the one frame time. a moment;

a duty factor determination module, configured to determine a duty factor corresponding to the target moment according to the minimum display brightness value and the display brightness value at the target moment;

a target duty cycle determination module, configured to determine the target duty cycle of the pulse width modulation signal at the target moment according to the duty cycle coefficient and the original duty cycle of the pulse width modulation signal;

A target duty cycle sending module, configured to send the target duty cycle to the backlight module, so that the backlight module adjusts the pulse width corresponding to the target moment according to the target duty cycle Modulated signal.

Optionally, the duty cycle coefficient determination module includes:

The duty cycle coefficient determination submodule is configured to determine the ratio of the minimum display brightness value to the display brightness value at the target time as the duty cycle coefficient corresponding to the target time.

Optionally, the target duty cycle determination module includes:

The target duty cycle determination submodule is configured to determine the product of the duty cycle coefficient and the original duty cycle of the pulse width modulation signal as the target duty cycle of the pulse width modulation signal at the target moment.

Optionally, the brightness adjustment device further includes:

a target display brightness value determination module, configured to determine a target display brightness value that the display panel needs to achieve at each moment in the one frame time;

A target maximum backlight brightness value determination module, configured to determine the target maximum backlight brightness value of the backlight module according to the target display brightness value, the original maximum backlight brightness value of the backlight module, and the minimum display brightness value ;

The target maximum backlight brightness value sending module is configured to send the target maximum backlight brightness value to the backlight module, so that the backlight module emits light according to the target maximum backlight brightness value.

Optionally, the module for determining the target maximum backlight brightness value, including:

a product calculation submodule, configured to calculate the product of the target display brightness value and the original maximum backlight brightness value of the backlight module;

The target maximum backlight brightness value determination sub-module is configured to determine the ratio of the product to the minimum display brightness value as the target maximum backlight brightness value of the backlight module.

In order to solve the above problems, the present invention also discloses a display device, including the above-mentioned brightness adjustment device.

Optionally, the display device further includes a backlight module and a display panel, and the display panel is disposed on the light-emitting side of the backlight module;

Wherein, the backlight module includes a backlight driving chip and a backlight substrate, and the backlight driving chip is configured to adjust the pulse width modulation signal corresponding to the target time according to the target duty cycle, and adjust the pulse width modulation signal corresponding to the target time according to the target duty cycle. The pulse width modulation signal controls the backlight brightness value of the light actually emitted by the backlight substrate.

Compared with the prior art, the present invention includes the following advantages:

In the embodiment of the present invention, by acquiring the minimum display brightness value of the display panel within one frame time and the display brightness value of the target moment within one frame time; the target moment is any moment within one frame time; according to the minimum display brightness value and the display brightness value at the target time, determine the duty cycle coefficient corresponding to the target time; according to the duty cycle coefficient and the original duty cycle of the PWM signal, determine the target duty cycle of the PWM signal at the target time; The target duty cycle is sent to the backlight module, so that the backlight module adjusts the pulse width modulation signal corresponding to the target moment according to the target duty cycle. According to the minimum display brightness value of the display panel within one frame time, the display brightness value of the target moment, and the original duty cycle of the pulse width modulation signal, the target duty cycle of the pulse width modulation signal at the target moment is determined, and then according to the The target duty cycle adjusts the pulse width modulation signal at the target time, and the adjusted pulse width modulation signal can change the backlight brightness value of the light actually irradiated on the display panel by the backlight module, thereby making the display panel one frame time. The display brightness corresponding to each time in the device is kept consistent, eliminating the flickering phenomenon of the display panel. In addition, the backlight brightness value of the light emitted by the backlight module is adjusted through the duty cycle to improve the flickering of the display panel. The improvement process is simple, and No longer test times are required.

Description of drawings

FIG. 1 shows a flowchart of a brightness adjustment method according to an embodiment of the present invention;

FIG. 2 shows a schematic diagram of collecting a brightness change curve of a display panel in an embodiment of the present invention;

Fig. 3 shows the schematic diagram of the brightness change curve in one frame time;

Fig. 4 shows the schematic diagram after the luminance change curve in one frame time is converted into digital signal;

FIG. 5 shows a flowchart of another brightness adjustment method according to an embodiment of the present invention;

Fig. 6 shows the corresponding waveform diagram when the duty cycle of the pulse width modulation signal is the original duty cycle;

Fig. 7 shows the corresponding waveform diagram when the duty cycle of the pulse width modulation signal is the target duty cycle;

FIG. 8 shows a schematic diagram of a brightness change curve in consecutive multiple frames after an unadjusted pulse width modulation signal acts on a backlight module;

FIG. 9 shows a schematic diagram of the brightness change curve of the display panel in the continuous multi-frame time after the adjusted pulse width modulation signal acts on the backlight module;

FIG. 10 shows a structural block diagram of an apparatus for adjusting brightness according to an embodiment of the present invention.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Example 1

Referring to FIG. 1 , a flowchart of a brightness adjustment method according to an embodiment of the present invention is shown, which is applied to a backlight module and may specifically include the following steps:

Step 101: Obtain the minimum display brightness value of the display panel within one frame time and the display brightness value at a target time within the one frame time; the target time is any time within the one frame time.

In the embodiment of the present invention, in order to prevent the liquid crystal from being kept in a deflected state all the time, causing the phenomenon of image sticking on the display screen, it is necessary to change the deflection state of the liquid crystal. When changing the deflected state of the liquid crystal, between adjacent frames It is necessary to apply voltages of different positive and negative polarities. During the voltage switching process of adjacent frames, the liquid crystal will flip, which will cause the display brightness value of the display panel to decrease during the process. The difference in brightness value will cause the display panel to flicker. In order to improve the flickering phenomenon, it is necessary to adjust the display brightness values of the display panel to be consistent within one frame.

In order to adjust the display brightness value of the display panel within a frame time, it is necessary to obtain the brightness change curve of the display panel with flickering phenomenon. Then, the camera 21 is aimed at the display panel 22, and the brightness change curve of the display panel 22 within a frame time under a specific grayscale image is collected. Figure 3 shows the brightness change curve of the display panel at different times within a frame time. It can be seen from Figure 3 that within a frame time, there are differences in the brightness at different times in the brightness change curve. and display the highest point of brightness value 32.

After acquiring the brightness change curve, convert the brightness change curve into a digital signal, and this process can be completed by exporting the brightness change curve from the oscilloscope. Figure 4 shows the display brightness value after the brightness change curve is converted into a digital signal. There are a minimum display brightness value 41 and a maximum display brightness value 42 in Figure 4, and the minimum display brightness value 41 in the display brightness value in Figure 4 is the same as that in Figure 3. The lowest point 31 of the display brightness value in the brightness change curve in FIG. 3 corresponds to the lowest point 31 of the display brightness value, the maximum display brightness value 42 corresponds to the highest point 32 of the display brightness value in the brightness change curve in FIG. 3 , and the minimum display brightness value is the display panel. The display brightness value of the lowest point in the brightness change curve obtained when the display panel is flickering, and the maximum display brightness value is the display brightness value of the highest point in the brightness change curve obtained when the display panel flickers. The abscissa in Figure 3 and Figure 4 is time, the unit is ms, and the ordinate is the brightness, the unit is nit. The digital signal includes the display brightness values of the display panel at different times in a frame time. After the digital signal is obtained After the signal is obtained, the minimum display brightness value within a frame time and the display brightness value at a target time within a frame time are obtained from the digital signal, wherein the target time is any time within a frame time. The acquisition of the minimum display brightness value and the display brightness value at the target time facilitates the determination of the duty cycle coefficient corresponding to the subsequent target time.

Step 102: Determine a duty cycle coefficient corresponding to the target time according to the minimum display brightness value and the display brightness value at the target time.

In the embodiment of the present invention, after obtaining the minimum display brightness value and the display brightness value at the target time, the minimum display brightness value and the display brightness value at the target time are used to determine the duty cycle coefficient corresponding to the target time.

Since the target moment is any moment in a frame time, the minimum display brightness value and the display brightness value at the target moment can be used to determine the duty cycle coefficient corresponding to any moment in a frame time, and the duty cycle corresponding to the target moment can be determined. The determination of the duty ratio coefficient can be used to subsequently determine the target duty ratio of the pulse width modulation signal (PWM, Pulse width modulation) at the target moment.

It should be noted that, in the embodiment of the present invention, the duty ratio at the moment corresponding to the minimum display brightness value is 1 to determine the duty ratio at other moments.

Step 103: Determine the target duty cycle of the pulse width modulation signal at the target moment according to the duty cycle coefficient and the original duty cycle of the pulse width modulation signal.

In the embodiment of the present invention, after determining the duty cycle coefficient corresponding to the target time according to the minimum display brightness value and the display brightness value at the target time, the original duty cycle of the PWM signal is obtained, and then, according to the corresponding target time and the original duty cycle of the PWM signal to determine the target duty cycle of the PWM signal at the target moment. Since the target moment is any moment in a frame time, the above method can determine the target duty cycle of the PWM signal at any moment in a frame time, and the acquisition of the target duty cycle can be used to determine the pulse width modulation signal for adjustment.

It should be noted that, in a frame time, the original duty ratios of the PWM signals at any two moments are the same, while in the embodiment of the present invention, within a frame time, the PWM signals at different moments The target duty cycle varies.

Step 104 , sending the target duty cycle to the backlight module, so that the backlight module adjusts the pulse width modulation signal corresponding to the target time according to the target duty cycle.

In the embodiment of the present invention, after acquiring the target duty cycle of the pulse width modulation signal at the target time, Tcon (Timer Control Register, central control board) sends the target duty cycle to the backlight module, and the backlight module according to The received target duty cycle adjusts the pulse width modulation signal at the target time, and the adjusted pulse width modulation signal can be used to adjust the backlight brightness value of the light actually emitted by the backlight module at the target time.

Correspondingly, the backlight module can adjust the pulse width modulation signal according to the target duty ratio at different times, thereby adjusting the backlight brightness value of the light actually emitted by the backlight module at different times. Since the target duty cycle of the PWM signal at different times is different within a frame time, the backlight brightness values of the light actually emitted by the backlight module at different times will be different.

The display brightness value of the display panel at any moment in a frame time is related to the backlight brightness value of the light actually emitted by the backlight module at that moment. Therefore, by adjusting the backlight brightness value of the light actually emitted by the backlight module at different times, the display brightness value at each moment in a frame time can be consistent, thereby improving the flickering phenomenon of the display panel.

In the embodiment of the present invention, the target of the pulse width modulation signal at the target time is determined according to the minimum display brightness value of the display panel within a frame time, the display brightness value at the target time, and the original duty cycle of the pulse width modulation signal. duty cycle, and then adjust the pulse width modulation signal at the target time according to the target duty cycle, and the adjusted pulse width modulation signal can change the backlight brightness value of the light actually irradiated on the display panel by the backlight module, and then can Keep the display brightness of the display panel consistent at each moment in a frame time, eliminate the flickering phenomenon of the display panel, and adjust the backlight brightness value of the light emitted by the backlight module through the duty cycle to improve the display panel flickering , the improvement process is simple, and does not require a long test time.

Embodiment 2

Referring to FIG. 5, a flowchart of another brightness adjustment method according to an embodiment of the present invention is shown, which may specifically include the following steps:

Step 501: Obtain the minimum display brightness value of the display panel within one frame time and the display brightness value at a target time within the one frame time; the target time is any time within the one frame time.

The principle of this step is similar to that of step 101 in the above-mentioned first embodiment, and details are not repeated here.

Step 502: Determine the ratio of the minimum display brightness value to the display brightness value at the target time as the duty cycle coefficient corresponding to the target time.

In the embodiment of the present invention, it is finally necessary to adjust the display brightness values of the display panel at any time in a frame time to be consistent, that is, the display brightness values of the display panels in the adjusted frame time are all equal. When the minimum display brightness value is adjusted, since the minimum display brightness value is adjusted to the target display brightness value, it is only realized by adjusting the original maximum backlight brightness value of the backlight module. Therefore, the pulse width modulation signal at this time is The duty cycle is still the original duty cycle, that is, the duty cycle coefficient k=1, so it can be known that the adjusted display brightness value A ₁ of the display panel at this moment is:

A ₁ =D ₀ *L _max *tr _min (1)

Among them, D ₀ is the original duty cycle of the pulse width modulation signal, tr _min is the transmittance of the display panel at the time corresponding to the minimum display brightness value in one frame time, that is, the minimum display brightness value l of the display panel in one frame time The ratio of _min to the actual original backlight brightness value of the backlight module, the actual original backlight brightness value of the backlight module D ₀ *L ₀ is the original maximum backlight brightness value L of the corresponding backlight module when a flickering picture appears on the display panel ₀ The actual backlight brightness value of the backlight module adjusted by the original duty cycle D ₀ . L _max is the target maximum backlight brightness value of the backlight module, and the target maximum backlight brightness value of the backlight module is the required value when adjusting the display brightness value at the time corresponding to the minimum display brightness value within one frame to the target display brightness value _lt . The maximum backlight brightness value of the backlight module.

When adjusting the display brightness at the target moment within one frame, the display brightness value A _n of the display panel at the target moment is obtained as:

A _n =D ₀ *k*L _max *tr _n (3)

Among them, D ₀ *k is the target duty cycle of the pulse width modulation signal corresponding to the target time, and tr _n is the transmittance of the display panel at the target time in one frame, that is, the display panel at the target time in one frame. The ratio of the brightness value l _n to the actual original backlight brightness value of the backlight module, since the display brightness value of the display panel at any moment in the frame time after adjustment is equal, that is, A ₁ =A _n , it can be known that:

D ₀ *L _max *tr _min =D ₀ *k*L _max *tr _n (5)

From formula (2), formula (4) and formula (5), the duty cycle coefficient k can be derived.

It can be seen from the above formula (6) that after determining the minimum display brightness value and the display brightness value at the target time, the ratio of the minimum display brightness value to the display brightness value at the target time can be calculated, and the duty cycle corresponding to the target time can be obtained. The determination of the target duty factor can be used to adjust the original duty cycle of the pulse width modulated signal subsequently.

Step 503: Determine the product of the duty cycle coefficient and the original duty cycle of the pulse width modulation signal as the target duty cycle of the pulse width modulation signal at the target moment.

In the embodiment of the present invention, after the duty factor k and the original duty cycle D _{0 of the pulse width modulation signal are obtained, the product of the duty factor k and the original duty cycle D 0 is} calculated, and the product is the target The target duty cycle D of the PWM signal at the moment, D=D ₀ *k.

As shown in Figure 6, it is a schematic diagram of the corresponding waveform when the duty cycle of the PWM signal is the original duty cycle. It can be seen from Figure 6 that the original duty cycle of the PWM signal corresponding to different moments in one frame time The ratios are the same; Figure 7 is a schematic diagram of the corresponding waveform when the duty cycle of the PWM signal is the target duty cycle, wherein the abscissa in Figure 6 is the time, and the ordinate is the pulse width modulation signal corresponding to the original duty cycle. , the abscissa in FIG. 7 is time, and the ordinate is the pulse width modulation signal corresponding to the target duty cycle.

Combining with Fig. 4, it can be seen from Fig. 7 that the target duty cycle at the time corresponding to the minimum display brightness value within a frame time does not change compared with the original duty cycle in Fig. 6. For example, the pulse width in Fig. 7 The duty cycle of the modulation signal at time T1 is equal to the duty cycle of the pulse width modulation signal at time T1 in Figure 6; and the target duty cycle on both sides of the time corresponding to the minimum display brightness value gradually decreases, that is, one frame At other times in the time except the time corresponding to the minimum display brightness value, the corresponding target duty cycle is smaller than the target duty cycle at the time corresponding to the minimum display brightness value, for example, the duty cycle of the pulse width modulation signal T2 in Figure 7 It is smaller than the duty cycle of the pulse width modulation signal T2 in FIG. 6 , that is, it is smaller than the duty cycle of the pulse width modulation signal T1 in FIG. 7 , and at the moment when the display brightness values are equal, the corresponding target duty cycle ratio is also equal.

The widths of 61 and 71 in Figure 6 and Figure 7 represent the size of the duty cycle, through

It can also be concluded that when the display brightness value l _n at the target time is equal to the minimum display brightness value l _min , D=D ₀ , at this time the original duty cycle is equal to the target duty cycle, and when the display brightness value l _n at the target time is greater than the minimum When the displayed luminance value is _lmin , D<D ₀ , and the target duty cycle D can be used to adjust the pulse width modulation signal at the subsequent target time.

Step 504: Send the target duty cycle to the backlight module, so that the backlight module adjusts the pulse width modulation signal corresponding to the target time according to the target duty cycle.

In the embodiment of the present invention, after the target duty cycle is obtained, the target duty cycle is sent to the backlight module, and the backlight module can adjust the pulse width modulation signal corresponding to the target time according to the target duty cycle. The target time is any time in a frame time, so that the pulse width modulation signal at any time in a frame time can be adjusted. After the adjusted pulse signal acts on the backlight module, it can adjust any time in a frame time. The backlight brightness value of the light actually irradiating the display panel of the backlight module at a moment is adjusted, so that after the adjusted brightness value passes through the display panel, the display brightness of the display panel at any moment in a frame time can be made uniform. The target display brightness is achieved, thereby improving the display brightness of the display panel.

When there are multiple frames of display images, the above-mentioned method can be used for adjustment for each frame of display images, so as to eliminate the flickering phenomenon of each frame of display images. As shown in FIG. 8, it is the brightness change curve of the continuously collected multi-frame display screen when the screen flickers. FIG. 9 is the brightness change curve after adjusting the multi-frame display screen in FIG. After adjustment, the brightness of each frame of the display screen at different times is basically the same. Therefore, the improvement of the flickering phenomenon of the display screen is realized. For the synchronization signal, when the pulse width modulation signal is adjusted by the duty ratio, the time to be adjusted can be determined according to the synchronization signal.

Step 505: Determine a target display brightness value that the display panel needs to achieve at each moment in the one frame time.

In the embodiment of the present invention, in order to improve the flickering phenomenon of the display panel, it is necessary to adjust the display brightness value of the display panel to be consistent within one frame. The target display brightness value, when adjusting the minimum display brightness value within a frame time to the target display brightness value, by keeping the original duty cycle of the pulse width modulation signal at the time corresponding to the minimum display brightness value unchanged, only the backlight module is changed. To achieve the original maximum backlight brightness value, and to adjust the display brightness value at other moments in a frame time except the moment corresponding to the minimum display brightness value to the target display brightness value, it is by changing the original proportion of the pulse width modulation signal at the corresponding moment. empty ratio to achieve. The target display brightness value is a reference value for adjusting the display brightness value of the display panel at any moment in the current frame time.

Step 506: Determine the target maximum backlight brightness value of the backlight module according to the target display brightness value, the original maximum backlight brightness value of the backlight module, and the minimum display brightness value.

In the embodiment of the present invention, the original maximum backlight brightness value of the backlight module is obtained, and then the target maximum backlight value of the backlight module is determined according to the determined target display brightness value, the original maximum backlight brightness value and the minimum display brightness value of the backlight module. Brightness value.

Specifically, step 506 includes sub-step 5061 and sub-step 5062:

Sub-step 5061, calculate the product of the target display brightness value and the original maximum backlight brightness value of the backlight module;

Sub-step 5062: Determine the ratio of the product to the minimum display brightness value as the target maximum backlight brightness value of the backlight module.

In the embodiment of the present invention, the target brightness value l _t of the display panel is obtained, that is, the display brightness value that the display panel needs to reach at any time in one frame time, and the display panel is displayed according to the target display brightness value l _t and one frame time. The ratio of the transmittance tr _min of the display panel at the time corresponding to the minimum display brightness value can determine the backlight module required when the display brightness value is adjusted to the target display brightness value l _t at the time corresponding to the minimum display brightness value. The actual target backlight brightness value D ₀ *L _max , namely

The actual target backlight brightness value D ₀ *L _max of the backlight module is used to improve the target maximum backlight brightness value L _max of the corresponding backlight module when the flickering screen appears on the display panel after the target duty cycle is adjusted. The actual backlight brightness value is D 0 *L max , since the duty cycle coefficient k=1 at this time, the actual target backlight brightness value of the backlight module at this time is D ₀ *L _max . Since D ₀ is known, it can be determined that The target maximum backlight brightness value L _max of the backlight module, the specific calculation formula of L _max is as follows:

Therefore, when determining the target maximum backlight brightness value L _max of the backlight module, the first step is to determine the product of the target display brightness value _lt and the original maximum backlight brightness value L ₀ of the backlight module.

In the embodiment of the present invention, when calculating the target maximum backlight brightness value _Lmax of the backlight module, according to the above formula (9), after obtaining the target display brightness value _lt and the original maximum backlight brightness value _L0 of the backlight module After the product, the ratio of the product to the minimum display brightness value is calculated, and the ratio is finally determined as the target maximum backlight brightness value of the backlight module. The determination of the target maximum backlight brightness value can be used to adjust the original maximum backlight brightness value of the backlight module. , so as to realize the adjustment of the display brightness value of the display panel.

In the embodiment of the present invention, when the determined target display brightness value of the display panel is 1 _t , for the time corresponding to the minimum display brightness value within one frame of the acquired display panel with flickering phenomenon, the adjusted time The display brightness value A1 _of the display panel is:

A ₁ =D ₀ *L _max *tr _min =l _t (10)

When the determined target display brightness value of the display panel is 1 _t , for the obtained moment of the maximum display brightness value within one frame of the display panel with flickering phenomenon, the adjusted display brightness value A2 of the display panel is _: :

A ₂ =D*L _max *tr _max =l _t (11)

It can be seen that the display brightness value at any moment in a frame time adjusted by the above method is equal, and the target display brightness value can be reached, so the flickering phenomenon of the display panel can be improved.

It should be noted that, when the target display brightness value l _t = l _min , that is, when the display brightness values of the display panel at different times in one frame time are adjusted to the minimum display brightness value l _min , according to formula (9), L _max =L ₀ , that is, it is not necessary to adjust the original maximum backlight brightness value of the backlight module at this time.

When l _t = l _max , that is, when the display brightness values of the display panel at different times in one frame are adjusted to the maximum display brightness value l _max , according to formula (9), it can be known that,

Among them, the maximum display brightness value _{lmax is the maximum display brightness value of the display panel with flickering phenomenon in one frame time. It can be seen from formula (12) that at this time, Lmax is} not equal to L ₀ , therefore, it is necessary to adjust the backlight mode. The original maximum brightness value of the group.

Step 507: Send the target maximum backlight brightness value to the backlight module, so that the backlight module emits light according to the target maximum backlight brightness value.

In the embodiment of the present invention, after the target maximum backlight brightness value of the backlight module is determined, the target maximum backlight brightness value is sent to the backlight module, because the target maximum backlight brightness value of the backlight module is in the minimum The display brightness value corresponding to the display brightness value is determined when the target display brightness value is adjusted to the target display brightness value. Therefore, when the backlight module adopts the target maximum backlight brightness value, the minimum display brightness value of the display panel within one frame can be adjusted as the target. Display the brightness value, so as to achieve the adjustment of the minimum display brightness value.

After adjusting the original maximum backlight brightness value of the backlight module to the target maximum backlight brightness value, you can adjust the duty cycle at other moments except the moment corresponding to the minimum display brightness value, so that the display panel at any moment in a frame time can be adjusted. The display brightness values are the target display brightness values.

In the embodiment of the present invention, first, the pulse width modulation signal at the target time is determined according to the minimum display brightness value of the display panel within a frame time, the display brightness value at the target time, and the original duty cycle of the pulse width modulation signal. and adjust the pulse width modulation signal at the target time according to the target duty cycle, and the adjusted pulse width modulation signal can change the backlight brightness value of the light actually irradiated on the display panel, which can make The corresponding display brightness of the display panel at each moment in one frame time remains the same, eliminating the flickering phenomenon of the display panel; secondly, the backlight brightness value of the light emitted by the backlight module is adjusted through the duty cycle to improve the flickering of the display panel. The improvement process is simple and does not require a long test time; again, by determining the target display brightness value that the display panel needs to reach within one frame, the target display brightness value and the original maximum backlight brightness value of the backlight module and the display panel are based on the target display brightness value. The minimum display brightness value determines the target maximum backlight brightness value of the backlight module, and then makes the backlight module emit light according to the target maximum backlight brightness value, so that the original maximum backlight brightness value of the backlight module can be adjusted, so that Improve the display brightness of the display panel.

Embodiment 3

Referring to FIG. 10, a structural block diagram of a brightness adjustment apparatus provided by an embodiment of the present invention is shown.

The brightness adjustment device 1000, applied to a backlight module, includes:

The display brightness value acquisition module 1001 is configured to acquire the minimum display brightness value of the display panel within one frame time and the display brightness value at the target time within the one frame time; the target time is the display brightness value within the one frame time any time;

A duty factor determination module 1002, configured to determine a duty factor corresponding to the target moment according to the minimum display brightness value and the display brightness value at the target moment;

a target duty cycle determination module 1003, configured to determine the target duty cycle of the pulse width modulation signal at the target moment according to the duty cycle coefficient and the original duty cycle of the pulse width modulation signal;

A target duty cycle sending module 1004, configured to send the target duty cycle to the backlight module, so that the backlight module adjusts the pulse corresponding to the target moment according to the target duty cycle width modulated signal.

Optionally, the duty cycle coefficient determination module 1002 includes:

The duty cycle coefficient determination submodule is configured to determine the ratio of the minimum display brightness value to the display brightness value at the target time as the duty cycle coefficient corresponding to the target time.

Optionally, the target duty cycle determination module 1003 includes:

The target duty cycle determination submodule is configured to determine the product of the duty cycle coefficient and the original duty cycle of the pulse width modulation signal as the target duty cycle of the pulse width modulation signal at the target moment.

Optionally, the brightness adjustment device 1000 further includes:

a target display brightness value determination module, configured to determine a target display brightness value that the display panel needs to achieve at each moment in the one frame time;

A target maximum backlight brightness value determination module, configured to determine the target maximum backlight brightness value of the backlight module according to the target display brightness value, the original maximum backlight brightness value of the backlight module, and the minimum display brightness value ;

The target maximum backlight brightness value sending module is configured to send the target maximum backlight brightness value to the backlight module, so that the backlight module emits light according to the target maximum backlight brightness value.

Optionally, the module for determining the target maximum backlight brightness value, including:

a product calculation submodule, configured to calculate the product of the target display brightness value and the original maximum backlight brightness value of the backlight module;

The target maximum backlight brightness value determination sub-module is configured to determine the ratio of the product to the minimum display brightness value as the target maximum backlight brightness value of the backlight module.

In the embodiment of the present invention, the target of the pulse width modulation signal at the target time is determined according to the minimum display brightness value of the display panel within one frame time, the display brightness value at the target time, and the original duty cycle of the pulse width modulation signal. duty cycle, and then adjust the pulse width modulation signal at the target time according to the target duty cycle, and the adjusted pulse width modulation signal can change the backlight brightness value of the light actually irradiated on the display panel by the backlight module, and then can Keep the display brightness of the display panel consistent at each moment in a frame time, eliminate the flickering phenomenon of the display panel, and adjust the backlight brightness value of the light emitted by the backlight module through the duty cycle to improve the display panel flickering , the improvement process is simple, and does not require a long test time.

Embodiment 4

An embodiment of the present invention also provides a display device, including the brightness adjustment device described in any one of the above.

The display device further includes a backlight module and a display panel, and the display panel is arranged on the light-emitting side of the backlight module; wherein, the backlight module includes a backlight driving chip and a backlight substrate, and the backlight driving chip is It is configured to adjust the pulse width modulation signal corresponding to the target time according to the target duty cycle, and control the backlight brightness value of the light actually emitted by the backlight substrate according to the adjusted pulse width modulation signal.

In the embodiment of the present invention, the brightness adjustment device is Tcon, Tcon sends the target duty cycle to the backlight driving chip in the backlight module, and the backlight driving chip adjusts the pulse width modulation signal according to the received target duty cycle, The backlight driving chip then sends the adjusted pulse width modulation signal to the backlight substrate, and the backlight substrate emits light according to the adjusted pulse width modulation signal, thereby obtaining the actual illumination of the backlight module that meets the target time. The backlight brightness value of the light, the backlight brightness value can make the display brightness value at any moment in a frame time to be consistent, thereby improving the flickering phenomenon of the display panel.

Further, when the target maximum backlight brightness value of the backlight module is not equal to the original maximum backlight brightness value of the backlight module, the target maximum backlight brightness value of the backlight module needs to be sent to the backlight driver chip in the backlight module. By increasing the driving voltage for driving the backlight substrate, the chip increases the driving current of the backlight substrate, thereby changing the original maximum backlight brightness value of the backlight module, so as to adjust the display brightness of the display panel.

In addition, the backlight module can be a direct-type backlight module or an edge-type backlight module, preferably a direct-type backlight module, since the refresh mode of the display panel is line-by-line refresh, the position of the refresh line of the direct-type backlight module is the same as that of the display panel. The positions of the refresh lines of the display panel are basically consistent, so that the display brightness of the display panel can be optimally improved.

In this embodiment of the present invention, the display device may be: a mobile phone, a tablet computer, a television, a notebook computer, a vehicle-mounted display product, or any other product or component that has screen flickering.

In the embodiment of the present invention, the target of the pulse width modulation signal at the target time is determined according to the minimum display brightness value of the display panel within one frame time, the display brightness value at the target time, and the original duty cycle of the pulse width modulation signal. duty cycle, and then adjust the pulse width modulation signal at the target time according to the target duty cycle, and the adjusted pulse width modulation signal can change the backlight brightness value of the light actually irradiated on the display panel by the backlight module, and then can Keep the display brightness of the display panel consistent at each moment in a frame time, eliminate the flickering phenomenon of the display panel, and adjust the backlight brightness value of the light emitted by the backlight module through the duty cycle to improve the display panel flickering , the improvement process is simple, and does not require a long test time.

For the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, Certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments may be referred to each other.

Finally, it should also be noted that in this document, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply these entities or there is any such actual relationship or sequence between operations. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article of manufacture or device comprising a list of elements includes not only those elements, but also those not expressly listed or other elements inherent to such a process, method, commodity or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article of manufacture, or device that includes the element.

A brightness adjustment method, a brightness adjustment device and a display device provided by the present invention have been described in detail above. The principles and implementations of the present invention are described with specific examples in this paper. The descriptions of the above embodiments are only used for Help to understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification It should not be construed as a limitation of the present invention.

Claims (8)

1. a brightness adjustment method, is characterized in that, is applied to backlight module, described method comprises: Obtain the minimum display brightness value of the display panel within one frame time and the display brightness value at the target time within the one frame time; the target time is any time within the one frame time; According to the minimum display brightness value and the display brightness value at the target moment, determine the duty cycle coefficient corresponding to the target moment; determining the target duty cycle of the pulse width modulation signal at the target moment according to the duty cycle coefficient and the original duty cycle of the pulse width modulation signal; sending the target duty cycle to the backlight module, so that the backlight module adjusts the pulse width modulation signal corresponding to the target moment according to the target duty cycle; The step of determining the duty cycle coefficient corresponding to the target moment according to the minimum display brightness value and the display brightness value at the target moment includes: The ratio of the minimum display brightness value to the display brightness value at the target time is determined as the duty cycle coefficient corresponding to the target time. 2 . The method according to claim 1 , wherein the target duty cycle of the pulse width modulation signal at the target time is determined according to the duty cycle coefficient and the original duty cycle of the pulse width modulation signal. 3 . The steps of the empty ratio include: The product of the duty cycle factor and the original duty cycle of the pulse width modulation signal is determined as the target duty cycle of the pulse width modulation signal at the target moment. 3. The method according to claim 1, wherein after the step of acquiring the minimum display brightness value of the display panel within one frame time and the display brightness value at the target time within the one frame time, further include: determining the target display brightness value that the display panel needs to achieve at each moment in the one frame time; Determine the target maximum backlight brightness value of the backlight module according to the target display brightness value, the original maximum backlight brightness value of the backlight module, and the minimum display brightness value; Sending the target maximum backlight brightness value to the backlight module, so that the backlight module emits light according to the target maximum backlight brightness value. 4 . The method according to claim 3 , wherein the backlight module is determined according to the target display brightness value, the original maximum backlight brightness value of the backlight module, and the minimum display brightness value. 5 . The steps to target the maximum backlight brightness value include: Calculate the product of the target display brightness value and the original maximum backlight brightness value of the backlight module; The ratio of the product to the minimum display brightness value is determined as the target maximum backlight brightness value of the backlight module. 5. A brightness adjustment device, characterized in that, applied to a backlight module, the device comprising: The display brightness value acquisition module is configured to acquire the minimum display brightness value of the display panel in one frame time and the display brightness value at the target time in the one frame time; the target time is any value in the one frame time. a moment; a duty factor determination module, configured to determine a duty factor corresponding to the target moment according to the minimum display brightness value and the display brightness value at the target moment; a target duty cycle determination module, configured to determine the target duty cycle of the pulse width modulation signal at the target moment according to the duty cycle coefficient and the original duty cycle of the pulse width modulation signal; A target duty cycle sending module, configured to send the target duty cycle to the backlight module, so that the backlight module adjusts the pulse width corresponding to the target moment according to the target duty cycle Modulation signal; the duty cycle coefficient determination module, including: The duty cycle coefficient determination submodule is configured to determine the ratio of the minimum display brightness value to the display brightness value at the target time as the duty cycle coefficient corresponding to the target time. 6. The apparatus according to claim 5, wherein the target duty cycle determination module comprises: The target duty cycle determination submodule is configured to determine the product of the duty cycle coefficient and the original duty cycle of the pulse width modulation signal as the target duty cycle of the pulse width modulation signal at the target moment. 7. A display device, comprising the brightness adjustment device according to any one of claims 5 to 6. 8 . The display device according to claim 7 , wherein the display device further comprises a backlight module and a display panel, and the display panel is arranged on a light-emitting side of the backlight module; 8 . Wherein, the backlight module includes a backlight driving chip and a backlight substrate, and the backlight driving chip is configured to adjust the pulse width modulation signal corresponding to the target time according to the target duty cycle, and adjust the pulse width modulation signal corresponding to the target time according to the target duty cycle. The pulse width modulation signal controls the backlight brightness value of the light actually emitted by the backlight substrate.

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