Display device control method and display device

Abstract

The display device and the control method thereof provided by the invention are used for improving picture flicker when the refresh frequency of the display device changes. The control method comprises the following steps: detecting the current refresh frequency of the display device in real time; and if the current refresh frequency is lower than the previous refresh frequency, and the current refresh frequency is lower than a first threshold value, and the previous refresh frequency is not lower than the first threshold value, driving the backlight module with a second backlight current, the second backlight current being greater than the first backlight current, and the second backlight current being greater than the first backlight current. Therefore, the display brightness at the current refresh frequency is equivalent to the display brightness at the last refresh frequency. Wherein the backlight module is driven by the first backlight current during the last refresh frequency driving period. Therefore, under the condition that the refresh frequency changes in real time, the display brightness can be kept almost consistent, and then picture flicker is improved.

Description

Technical Field

[0001] The present invention relates to a display device control method and a display device, and in particular to a display device control method and a display device for improving screen flicker. Background Art

[0002] Due to the performance difference between the monitor and the computer host, there is often a mismatch between the rate at which the computer host outputs image signals and the rate at which the monitor plays the picture. When the content in the picture changes greatly, such as movies with complex scenes, games with high-speed character movement, etc., it will cause picture delays or tearing, seriously affecting the user's viewing experience.

[0003] In order to improve the image delay or tearing, the current monitors are usually equipped with adaptive refresh rate (such as FreeSync / Adtive Sync / G-sync Compatible, etc.), that is, the rate at which the monitor displays the image is adaptively adjusted in real time according to the rate at which the computer host outputs the image signal. In other words, the monitor displays the image at a variable refresh rate. When the LCD monitor displays the image at different refresh rates, the brightness of the image will change synchronously due to the change in refresh rate, which will cause the display image to flicker, affecting the user experience. Therefore, how to improve the image flicker when the refresh rate of the display device changes has become a new research topic. Summary of the invention

[0004] An object of the present invention is to provide a display device control method and a display device for improving screen flicker.

[0005] To achieve the above object, the present invention provides a display device control method, comprising:

[0006] Real-time detection of the current refresh rate of the display device;

[0007] Among them, if the current refresh frequency is lower than the previous refresh frequency, and the current refresh frequency is lower than the first threshold, and the previous refresh frequency is not lower than the first threshold, the backlight module is driven with a second backlight current, and the second backlight current is greater than the first backlight current, so that the display brightness at the current refresh frequency is equivalent to the display brightness at the previous refresh frequency; wherein, the backlight module is driven with the first backlight current during the driving period of the previous refresh frequency.

[0008] Preferably, when the current refresh frequency is lower than the first threshold and not lower than the second threshold, the second backlight current is the first sub-current; when the current refresh frequency is lower than the second threshold, the second backlight current is the second sub-current, wherein the second threshold is lower than the first threshold, and wherein the first sub-current is lower than the second sub-current.

[0009] Further preferably, when the current refresh frequency is lower than a third threshold, the backlight module is driven with a third sub-current, wherein the third threshold is lower than the second threshold, the difference between the third threshold and the second threshold is greater than the difference between the second threshold and the first threshold, and the difference between the third sub-current and the second sub-current is greater than the difference between the second sub-current and the first sub-current.

[0010] Further preferably, based on the first backlight current and a step-by-step correspondence between the backlight current and the refresh frequency at the same display brightness, step-by-step regulation is performed to obtain the second backlight current.

[0011] Preferably, based on the first backlight current and a one-to-one correspondence between the backlight current and the refresh frequency at the same display brightness, smooth adjustment is performed to obtain the second backlight current.

[0012] Preferably, the correspondence between the backlight current and the refresh frequency under the same display brightness is acquired in advance, and the backlight current corresponding to the current refresh frequency is obtained according to the correspondence.

[0013] To achieve the above object, the present invention provides a display device control method, comprising:

[0014] Real-time detection of the current refresh rate of the display device;

[0015] Among them, if the current refresh frequency is lower than the previous refresh frequency, if and the current refresh frequency is lower than the first threshold, and the previous refresh frequency is lower than the first threshold, the backlight module is driven with a second backlight current, and the second backlight current is not less than the first backlight current, so that the display brightness at the current refresh frequency is equivalent to the display brightness at the previous refresh frequency; wherein, the backlight module is driven with the first backlight current during the driving period of the previous refresh frequency.

[0016] Preferably, when the current refresh frequency is lower than the first threshold and not lower than the second threshold, the second backlight current is the first sub-current; when the current refresh frequency is lower than the second threshold, the second backlight current is the second sub-current, wherein the second threshold is lower than the first threshold, and wherein the first sub-current is lower than the second sub-current.

[0017] Further preferably, when the current refresh frequency is lower than a third threshold, the backlight module is driven with a third sub-current, wherein the third threshold is lower than the second threshold, the difference between the third threshold and the second threshold is greater than the difference between the second threshold and the first threshold, and the difference between the third sub-current and the second sub-current is greater than the difference between the second sub-current and the first sub-current.

[0018] Further preferably, based on the first backlight current and a step-by-step correspondence between the backlight current and the refresh frequency at the same display brightness, step-by-step regulation is performed to obtain the second backlight current.

[0019] Preferably, based on the first backlight current and a one-to-one correspondence between the backlight current and the refresh frequency at the same display brightness, smooth adjustment is performed to obtain the second backlight current.

[0020] Preferably, the correspondence between the backlight current and the refresh frequency under the same display brightness is acquired in advance, and the backlight current corresponding to the current refresh frequency is obtained according to the correspondence.

[0021] To achieve the above object, the present invention provides a display device, comprising:

[0022] Backlight module;

[0023] A driving module, used for generating a backlight current;

[0024] A multiplexer module is coupled to the backlight module and the driving module, and the multiplexer module modulates the backlight current to drive the backlight module to emit light;

[0025] A processing module is coupled to the driving module and the multiplexer module; the processing module is used to detect the current refresh frequency of the display device in real time; when it is determined that the current refresh frequency is lower than the previous refresh frequency, if the current refresh frequency is lower than a first threshold value, and the previous refresh frequency is not lower than the first threshold value, a signal is sent to the multiplexer module to drive the multiplexer module to modulate the backlight current into a second backlight current, and the second backlight current is greater than the first backlight current, so that the display brightness at the current refresh frequency is equivalent to the display brightness at the previous refresh frequency; wherein, during the driving period of the previous refresh frequency, the multiplexer module modulates the backlight current into the first backlight current.

[0026] Preferably, the multiplexer module includes a plurality of groups of resistance paths, each group of resistance paths corresponds to a different refresh frequency; the processing module drives the multiplexer module to select the group of resistance paths corresponding to the current refresh frequency according to the current refresh frequency.

[0027] Further preferably, the driving module includes multiple output ends, the multiple output ends are respectively connected one by one to the input ends of the multiple groups of resistance paths of the multiplexer module, and the output ends of the multiple groups of resistance paths are selectively connected to the output end of the multiplexer module; the processing module selects one of the output ends of the multiple groups of resistance paths according to the current refresh frequency.

[0028] Further preferably, the multiplexer module sets the resistance value of the resistance path corresponding to each refresh frequency according to the corresponding relationship between the backlight current and the refresh frequency under the same display brightness.

[0029] To achieve the above object, the present invention provides a display device, comprising:

[0030] Backlight module;

[0031] A driving module, used for generating a backlight current;

[0032] A multiplexer module is coupled to the backlight module and the driving module, and the multiplexer module modulates the backlight current to drive the backlight module to emit light;

[0033] A processing module is coupled to the driving module and the multiplexer module; the processing module is used to detect the current refresh frequency of the display device in real time; when it is determined that the current refresh frequency is lower than the previous refresh frequency, if the current refresh frequency is lower than a first threshold value, and the previous refresh frequency is lower than the first threshold value, a signal is sent to the multiplexer module to drive the multiplexer module to modulate the backlight current into a second backlight current, and the second backlight current is not less than the first backlight current, so that the display brightness at the current refresh frequency is equivalent to the display brightness at the previous refresh frequency; wherein, during the driving period of the previous refresh frequency, the multiplexer module modulates the backlight current into the first backlight current.

[0034] Preferably, the multiplexer module includes a plurality of groups of resistance paths, each group of resistance paths corresponds to a different refresh frequency; the processing module drives the multiplexer module to select the group of resistance paths corresponding to the current refresh frequency according to the current refresh frequency.

[0035] Further preferably, the driving module includes multiple output ends, the multiple output ends are respectively connected one by one to the input ends of the multiple groups of resistance paths of the multiplexer module, and the output ends of the multiple groups of resistance paths are selectively connected to the output end of the multiplexer module; the processing module selects one of the output ends of the multiple groups of resistance paths according to the current refresh frequency.

[0036] Further preferably, the multiplexer module sets the resistance value of the resistance path corresponding to each refresh frequency according to the corresponding relationship between the backlight current and the refresh frequency under the same display brightness.

[0037] Compared with the prior art, the display device and control method thereof provided by the present invention include: real-time detection of the current refresh frequency of the display device; if the current refresh frequency is lower than the previous refresh frequency, and the current refresh frequency is lower than the first threshold, and the previous refresh frequency is not lower than the first threshold, then the backlight module is driven with a second backlight current, and the second backlight current is greater than the first backlight current, so that the display brightness at the current refresh frequency is equivalent to the display brightness at the previous refresh frequency. Wherein, the backlight module is driven with the first backlight current during the driving period of the previous refresh frequency. Therefore, the display brightness can be kept almost consistent when the refresh frequency changes in real time, thereby improving the screen flicker. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of the system structure of a display device in one embodiment of the present invention;

[0039] Figure 2 A schematic diagram showing the relationship between display brightness and refresh rate in one embodiment of the present invention;

[0040] Figure 3 is a flow chart of a method for controlling a display device in one embodiment of the present invention;

[0041] Figure 4 A schematic diagram of the relationship between backlight current and refresh frequency in one embodiment of the present invention;

[0042] Figure 5 Schematic diagram of the adjustment method of the second backlight current in the first embodiment of the present invention;

[0043] Figure 6 Schematic diagram of a method for adjusting the second backlight current in the second embodiment of the present invention;

[0044] Figure 7 A schematic diagram of a method for adjusting the second backlight current in a third embodiment of the present invention;

[0045] Figure 8 Schematic diagram of a method for adjusting the second backlight current in a fourth embodiment of the present invention;

[0046] Fig. 9 FIG. 4 is a schematic diagram of a method for adjusting the second backlight current in the fifth embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed description is given in conjunction with the embodiments.

[0048] Certain words are used in the specification and claims to refer to specific components. Those with ordinary knowledge in the field should understand that manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but rather use differences in components' functions as the criteria for distinction. The term "including" mentioned throughout the specification and claims is an open-ended term and should be interpreted as "including but not limited to".

[0049] See also Figure 1, is a schematic diagram of the system structure of the display device 1 provided by the present invention. The display device 1 includes a processing module 11, a driving module 12, a multiplexer module 13 and a backlight module 14. The driving module 12 is used to generate a backlight current, and the multiplexer module 13 is coupled to the backlight module 14 and the driving module 12. The multiplexer module 13 is used to modulate the size of the backlight current generated by the driving module 12, and drive the backlight module 14 to emit backlight with the backlight current of the size. The backlight module 14 can be any device with a light-emitting function. For example, the backlight module 14 can be at least one string of light-emitting diodes (LEDs).

[0050] The processing module 11 can be any form of computing element, such as a processing chip (Scalar), a central processing unit, a microprocessor, a programmable control module, etc., which can detect the current refresh frequency of the display device 1 in real time. Specifically, the display device 1 also includes a pixel module 16, which is coupled to the processing module 11 and can be any element with the function of displaying shape and color. When displaying a picture, the pixel module 16 receives an image signal and refreshes each pixel to form a pattern of the picture. The pattern of the picture refers to the shape and / or color in the picture. The frequency at which the pixel module 16 refreshes the pixels is the refresh frequency of the display device 1. In other words, the processing module 11 detects the current frequency at which the pixel module 16 refreshes the pixels in real time. It should be noted that the pixel module 16 itself does not emit light. The backlight emitted by the backlight module 14 passes through each pixel in the pixel module 16 to form a display brightness, so that the user can view the picture pattern under the display brightness. According to research, if Figure 2 As shown, when the brightness of the backlight generated by the backlight module 14 remains unchanged, when the frequency of the pixel module 16 refreshing the pixels increases, the frequency of the backlight generated by the backlight module 14 increases synchronously, that is, the total time of the backlight generated by the backlight module 14 increases, resulting in an increase in display brightness; when the frequency of the pixel module 16 refreshing the pixels decreases, the frequency of the backlight generated by the backlight module 14 decreases synchronously, that is, the total time of the backlight generated by the backlight module 14 decreases, resulting in a decrease in display brightness. It can be understood that the backlight module 14 generates backlight under the drive of the backlight current, wherein the brightness of the backlight is related to the size of the backlight current. Within the tolerance range of the backlight module 14, the larger the backlight current, the brighter the backlight, and the higher the display brightness at the same refresh frequency; conversely, the smaller the backlight current, the darker the backlight, and the lower the display brightness at the same refresh frequency. Therefore, when the current refresh frequency changes compared to the previous refresh frequency, the size of the backlight current is adjusted in real time according to the frequency at which the current pixel module 16 refreshes the pixel. When the current refresh frequency decreases compared to the previous refresh frequency, the backlight brightness can be brightened; when the current refresh frequency increases compared to the previous refresh frequency, the backlight brightness can be dimmed, so that the display brightness is almost consistent, for example, Figure 2As shown in the figure, when the refresh frequency is 48Hz, the display brightness before the backlight current adjustment (corresponding to Figure 2 The solid line part in the figure is 345, which is larger than the display brightness when the refresh rate is greater than or equal to 60Hz. When the current refresh rate is lower than the previous refresh rate, it is easy to cause the screen to flicker. The display brightness after the backlight current is adjusted (corresponding to Figure 2 The dotted part in the figure is 350 higher than before adjustment, which reduces the display brightness change when the refresh rate is greater than or equal to 60Hz, and can improve the screen flicker.

[0051] Specifically, the maximum change in display brightness that cannot be perceived by the human eye (usually the average brightness of the display screen, the same below) is called the critical amount, that is, when the change in display brightness during the current refresh frequency driving period compared to the display brightness during the previous refresh frequency driving period is less than or equal to the critical amount, the user will not feel the display screen flickering. Normally, when the refresh frequency is always not lower than the first threshold value (for example, 60Hz), the backlight module 14 is driven with an initial backlight current (for example, 50mA), and the change in refresh frequency usually does not cause the display brightness to change by more than the critical amount; however, if the current refresh frequency changes to a greater extent than the previous refresh frequency, and the current refresh frequency is lower than the first threshold value, the change in the current display brightness compared to the previous display brightness is greater than the critical amount, resulting in obvious screen flickering. In order to improve the screen flicker, the processing module 11 is further coupled to the driving module 12 and the multiplexer module 13. If the processing module 11 determines that the current refresh frequency is lower than the previous refresh frequency, and the current refresh frequency is lower than the first threshold, a signal is sent to the multiplexer module 13 to drive the multiplexer module 13 to modulate the backlight current into a second backlight current during the current refresh frequency driving period. According to the difference between the current refresh frequency and the previous refresh frequency, the second backlight current is greater than or equal to the first backlight current, so that the display brightness at the current refresh frequency is equivalent to the display brightness at the previous refresh frequency. During the previous refresh frequency driving period, the multiplexer module 13 modulates the backlight current into the first backlight current. In other words, during the last refresh frequency driving period (depending on the last refresh frequency, the time scale may be milliseconds, seconds, or minutes), the backlight module 14 is driven by the first backlight current, and the backlight module 14 generates a backlight with a corresponding brightness (usually the average brightness of the backlight, the same below) under the drive of the first backlight current, and forms a corresponding display brightness; if the current refresh frequency is lower than the last refresh frequency and is lower than the first threshold, during the current refresh frequency driving period (depending on the current refresh frequency, the time scale may be different from or the same as the last refresh frequency driving period), the processing module 11 drives the multiplexer module 13 to modulate the backlight current into a second backlight current to drive the backlight module 14, and the backlight generated by the backlight module 14 under the drive of the second backlight current can form a display brightness equivalent to the last display brightness. Therefore, the change in the current display brightness compared to the last display brightness is less than or equal to the critical amount of display brightness change, so that the user does not feel the screen flickering.

[0052] It should be noted that, when the current refresh frequency is lower than the first threshold, the second backlight current is greater than the first backlight current in the following specific cases: the previous refresh frequency is not lower than the first threshold, that is, when the backlight current remains unchanged, driving at the current refresh frequency will cause the display brightness to change by more than the critical amount, so it is necessary to increase the size of the backlight current during the current refresh frequency driving period so that the current display brightness is equivalent to the previous display brightness; or, the previous refresh frequency is lower than the first threshold, but the difference between the current refresh frequency and the previous refresh frequency is larger, and when the backlight current remains unchanged, the display brightness will change by more than the critical amount, so it is necessary to increase the size of the backlight current during the current refresh frequency driving period so that the current display brightness is equivalent to the previous display brightness. The specific case where the second backlight current is equal to the first backlight current is: the previous refresh frequency is also lower than the first threshold, but the difference between the current refresh frequency and the previous refresh frequency is smaller, that is, when the backlight current remains unchanged, the change in display brightness is less than the critical amount, and it is regarded that the current display brightness is equivalent to the previous display brightness. Among them, when the previous display brightness is not lower than the first threshold, the first backlight current is generally the initial backlight current described in the previous paragraph; when the previous display brightness is lower than the first threshold, in order to make the previous display brightness equivalent to the previous display brightness, the first backlight current is increased compared to the initial backlight current.

[0053] Based on the above, multiple backlight currents can be set according to multiple refresh frequencies, so that when the refresh frequency decreases, the backlight brightness increases; when the refresh frequency increases, the backlight brightness decreases, so that the display brightness is always almost consistent. It should be noted that the above is mainly explained for the case where the current refresh frequency is lower than the previous refresh frequency. When the current refresh frequency is higher than the previous refresh frequency, the corresponding relationship between the current backlight current and the current refresh frequency still follows the principle of keeping the current display brightness equivalent to the previous display brightness. For example, the current refresh frequency and the previous refresh frequency are both lower than the first threshold. If the current refresh frequency is higher than the previous refresh frequency, the second backlight current is smaller than the first backlight current. The present invention is not limited to this.

[0054] In a preferred embodiment, the multiplexer module 13 includes multiple groups of resistance paths, each group of resistance paths corresponds to a different refresh frequency. The processing module 11 drives the multiplexer module 13 to select the group of resistance paths corresponding to the current refresh frequency according to the current refresh frequency. Specifically, the driving module 12 includes multiple output terminals, and the multiple output terminals are respectively connected to the input terminals of the multiple groups of resistance paths of the multiplexer module 13 one by one, and the output terminals of the multiple groups of resistance paths are selectively connected to the output terminals of the multiplexer module 13. The processing module 11 selects one of the output terminals of the multiple groups of resistance paths according to the current refresh frequency. Furthermore, the multiplexer module 13 sets the resistance value of the resistance path corresponding to each refresh frequency according to the corresponding relationship between the backlight current and the refresh frequency under the same display brightness.

[0055] Based on the above-mentioned display device 1, as Figure 3 As shown, the present invention provides a control method for a display device, comprising:

[0056] The processing module 11 detects the current refresh frequency of the pixel module 16 in real time. During the current refresh frequency driving period, the multiplexer module 13 modulates the backlight current into a second backlight current. The backlight module 14 generates backlight under the driving of the second backlight current. Figure 3 In step S11, when the current refresh frequency is lower than the previous refresh frequency, the processing module 11 confirms that the current refresh frequency is lower than the first threshold and the previous refresh frequency is not lower than the first threshold, see the attached Figure 3 In step S12 of the embodiment, the second backlight current is greater than the first backlight current, so that the display brightness at the current refresh rate is equivalent to the display brightness at the previous refresh rate. During the driving period of the previous refresh rate, the multiplexer module 13 modulates the backlight current into the first backlight current, and the backlight module 14 generates backlight under the driving of the first backlight current.

[0057] When the current refresh rate is lower than the previous refresh rate, if the processing module 11 confirms that the current refresh rate is not lower than the first threshold, and the previous refresh rate is not lower than the first threshold, see Appendix Figure 3 In step S12′ in the embodiment, the second backlight current is equal to the first backlight current, so that the display brightness at the current refresh frequency is equivalent to the display brightness at the previous refresh frequency. In other words, when the current refresh frequency and the previous refresh frequency are both not lower than the first threshold value, the refresh frequencies in the two driving periods are both at a relatively high level, so the change in display brightness caused by the change in refresh frequency will not exceed the critical amount, and even if the second backlight current is equal to the first backlight current, the user will not notice the change in display brightness, and it can be considered that the display screen does not flicker.

[0058] When the current refresh rate is lower than the previous refresh rate, if the processing module 11 determines that the current refresh rate is lower than the first threshold and the previous refresh rate is lower than the first threshold, see the attached Figure 3 In step S12″ in the above, the second backlight current is not less than the first backlight current, so that the display brightness at the current refresh frequency is equivalent to the display brightness at the previous refresh frequency. When the current refresh frequency differs slightly from the previous refresh frequency, the second backlight current is equal to the first backlight current; when the current refresh frequency differs significantly from the previous refresh frequency, the second backlight current is greater than the first backlight current. The specific current modulation method has been described in detail above and will not be repeated here.

[0059] In summary, if Figure 4 As shown, when the current refresh frequency and the previous refresh frequency are not lower than the first threshold, the second backlight current is equal to the first backlight current; when the current refresh frequency is lower than the first threshold, and the previous refresh frequency is not lower than the first threshold, the greater the difference (generally absolute value) between the current refresh frequency and the first threshold, the greater the second backlight current and the brighter the backlight; when the current refresh frequency and the previous refresh frequency are lower than the first threshold, the second backlight current is not less than the first backlight current. Taking the first threshold of 60Hz as an example, when the current refresh frequency is 50Hz, the second backlight current is 98mA; when the current refresh frequency is 48Hz, the second backlight current is 100mA. When the current refresh frequency is higher than or equal to the first threshold, the second backlight current is 50mA. The above examples are provided to facilitate understanding of the solution, but the correspondence between the backlight current and the refresh frequency is not limited to this. By using the above method, the backlight current is modulated into a second backlight current of corresponding size. From the perspective of user experience, the display brightness viewed by the user will not change significantly due to the change in refresh frequency, that is, the problem of screen flickering is improved.

[0060] In a preferred embodiment, the display device 1 further includes a storage module 15, which is coupled to the processing module 11 and is used to store the correspondence between the backlight current and the refresh frequency at the same brightness (for example, a checklist containing the correspondence between the backlight current and the refresh frequency). The processing module 11 can quickly obtain the corresponding second backlight current based on the detected current refresh frequency and the checklist. In this process, the amount of calculation undertaken by the processing module 11 is relatively small, which can reduce the performance cost of the processing module 11.

[0061] In a preferred embodiment, before step S11, a step S10 of presetting the relationship between the backlight current and the refresh frequency is also included: according to the corresponding relationship between the backlight current and the refresh frequency under the same display brightness, a check table is pre-established and stored in the storage module 15. Specifically, the check table includes the size of the backlight current when the refresh frequency is not lower than the first threshold; and the size of the backlight current corresponding to each refresh frequency when the refresh frequency is lower than the first threshold. By means of the processing module 11, according to the detected current refresh frequency and the check table retrieved from the storage module 15, the size of the second backlight current can be quickly determined, and when the current refresh frequency changes compared to the previous refresh frequency, the response speed of adjusting the display brightness is improved. It should be noted that when the check table is first established, the calibration step can be performed by the processing module 11 to obtain the relationship between the backlight current and the refresh frequency; or the staff can detect the display brightness to obtain the relationship between the backlight current and the refresh frequency, and then manually input it into the storage module 15, and the present invention is not limited to this.

[0062] In view that the display screen flickers mainly occur when the refresh frequency is low, the following mainly describes the relationship between the backlight current and the refresh frequency at the same display brightness when the refresh frequency is lower than the first threshold.

[0063] In one embodiment, the refresh frequency includes a plurality of continuous frequency segments. The second backlight current includes a plurality of sub-currents corresponding to the plurality of frequency segments, the second sub-current is larger than the first sub-current, the third sub-current is larger than the second sub-current, and so on. When the current refresh frequency falls within one of the plurality of frequency segments, the multiplexer module 13 modulates the second backlight current into a corresponding sub-current, so that a plurality of threshold values ​​of the refresh frequency are defined as the endpoint values ​​of the plurality of frequency segments, and a second backlight current of a corresponding size between two adjacent threshold values ​​is set, so as to facilitate the establishment of the check table, wherein the rules for defining the plurality of frequency segments and threshold values ​​are described below.

[0064] In the first embodiment of the present invention, Figure 5As shown, the refresh frequency lower than the first threshold is divided into a plurality of continuous frequency segments, and a plurality of thresholds are set corresponding to the endpoint value of each frequency segment, wherein the first threshold is the maximum value of the first frequency segment, the second threshold is the minimum value of the first frequency segment and the maximum value of the second frequency segment (for example, the endpoint value of the open interval of the second frequency segment, the same below), and so on, wherein the width of each frequency segment is the same, that is, the difference between every two adjacent thresholds is equal. When the refresh frequency falls in the same frequency segment multiple times, the second backlight current maintains the same size. In this embodiment, the difference between the second backlight currents in every two adjacent frequency segments is equal. For example, the multiple frequency segments include a first frequency segment (first threshold to second threshold), a second frequency segment (second threshold to third threshold) and a third frequency segment (third threshold to fourth threshold), the first frequency segment corresponds to a first sub-current, the second frequency segment corresponds to a second sub-current, and the third frequency segment corresponds to a third sub-current, wherein the difference (absolute value) between the second sub-current and the first sub-current is equal to the difference between the third sub-current and the second sub-current. Based on the above relationship between the backlight current and the refresh frequency, the backlight current-refresh frequency image is obtained as shown in FIG. Figure 5 In other words, based on the first backlight current and the correspondence between the backlight current and the refresh frequency at the same display brightness, the second backlight current is adjusted in an evenly spaced step-by-step manner to obtain the second backlight current.

[0065] In a second embodiment of the present invention, Figure 6As shown, similar to the first embodiment, the refresh frequency lower than the first threshold is divided into multiple continuous frequency segments, and multiple thresholds are set corresponding to the endpoint values ​​of each frequency segment, wherein the first threshold is the maximum value of the first frequency segment, the second threshold is the minimum value of the first frequency segment and the maximum value of the second frequency segment, and so on, wherein, different from the first embodiment, the greater the difference between the current refresh frequency and the first threshold, the greater the increase in the second backlight current corresponding to the frequency segment where the refresh frequency is located. The increase refers to the increase in the second backlight current when the current refresh frequency decreases by the same numerical amount compared to the previous refresh frequency, the same below. In other words, the increase in the second backlight current corresponding to the second frequency segment is greater than that of the second backlight current corresponding to the first frequency segment. For example, the multiple frequency segments include a 1st frequency segment (a first threshold value to a second threshold value), a 2nd frequency segment (a second threshold value to a third threshold value), and a 3rd frequency segment (a third threshold value to a fourth threshold value), the 1st frequency segment corresponds to a first sub-current, the 2nd frequency segment corresponds to a second sub-current, and the 3rd frequency segment corresponds to a third sub-current, wherein the difference (absolute value) between the second sub-current and the first sub-current is smaller than the difference between the third sub-current and the second sub-current. In this embodiment, the smaller the refresh frequency, the larger the width of the frequency segment, that is, the difference between the third threshold value and the second threshold value is greater than the difference between the second threshold value and the first threshold value, and so on. In other embodiments, the width of each frequency segment may also be the same, or the smaller the refresh frequency, the smaller the width of the frequency segment, and the present invention is not limited thereto. According to the above-mentioned relationship between the backlight current and the refresh frequency, the obtained backlight current-refresh frequency image is as follows: Figure 6 In other words, based on the first backlight current and the corresponding relationship between the backlight current and the refresh rate at the same display brightness, the second backlight current is adjusted in steps with unequal spacing to obtain the second backlight current.

[0066] In another embodiment, at the same display brightness, each refresh frequency corresponds to the magnitude of a second backlight current. In this embodiment, based on the one-to-one correspondence between the first backlight current and the backlight current and the refresh frequency at the same display brightness, the second backlight current is smoothly adjusted to obtain. At this time, a check table can be established according to the correspondence between each backlight current and the refresh frequency, and the check table can be retrieved via the processing module 11 to obtain the magnitude of the second backlight current; the correspondence between the backlight current and the refresh frequency can also be fitted into a functional relationship curve, and the magnitude of the second backlight current can be calculated by the processing module 11 according to the current refresh frequency and the functional relationship, but the present invention is not limited thereto.

[0067] In a third embodiment of the present invention, Figure 7As shown, when the current refresh frequency is lower than the first threshold, the second backlight current is linearly related to the current refresh frequency. For example, the scatter points of each refresh frequency and the corresponding second backlight current are distributed on a straight line with a specific slope.

[0068] In a fourth embodiment of the present invention, Figure 8 As shown, when the current refresh frequency is lower than the first threshold, the greater the difference between the current refresh frequency and the first threshold, the greater the increase of the second backlight current. For example, according to the relationship between the magnitude of the second backlight current and the refresh frequency, the image of the backlight current-refresh frequency is obtained as shown in FIG. Figure 7 As shown, it is in the shape of a concave parabola.

[0069] In a fifth embodiment of the present invention, Fig. 9 As shown, when the current refresh frequency is lower than the first threshold, the greater the difference between the current refresh frequency and the first threshold, the smaller the increase of the second backlight current. For example, according to the relationship between the magnitude of the second backlight current and the refresh frequency, the image of the backlight current-refresh frequency is obtained as shown in FIG. Figure 7 As shown, it is in the shape of an upward convex parabola.

[0070] In a preferred embodiment, the control method further includes step S12″: if the processing module 11 detects that the current refresh frequency is still lower than a specific threshold value (for example, 48 Hz), the backlight current corresponding to the refresh frequency not lower than the first threshold value is used as the second backlight current to drive the backlight module 14. In this way, it can be avoided that the second backlight current is modulated too much due to the current refresh frequency being too low, which exceeds the tolerance range of the backlight module 14 and causes damage to the components. This is a protection mechanism for the backlight module 14. It should be noted that the specific threshold value is close to the lower limit of the refresh frequency relative to the overall range of the refresh frequency. That is to say, the frequency of refreshing the pixels of the pixel module 16 will not be lower than the specific threshold value in most cases, so enabling the protection mechanism will basically not make the user perceive the screen flickering phenomenon.

[0071] In summary, the display device and control method thereof provided by the present invention include: real-time detection of the current refresh frequency of the display device; if the current refresh frequency is lower than the previous refresh frequency, and the current refresh frequency is lower than the first threshold, and the previous refresh frequency is not lower than the first threshold, then the backlight module is driven with a second backlight current, and the second backlight current is greater than the first backlight current, so that the display brightness at the current refresh frequency is equivalent to the display brightness at the previous refresh frequency. Wherein, the backlight module is driven with the first backlight current during the driving period of the previous refresh frequency. Therefore, the display brightness can be kept almost consistent when the refresh frequency changes in real time, thereby improving the screen flicker.

[0072] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A display device control method, characterized in that: include: Real-time detection of the current refresh rate of the display device; Among them, if the current refresh frequency is lower than the previous refresh frequency, and the current refresh frequency is lower than the first threshold, and the previous refresh frequency is not lower than the first threshold, the backlight module is driven with a second backlight current, and the second backlight current is greater than the first backlight current, so that the display brightness at the current refresh frequency is equivalent to the display brightness at the previous refresh frequency; wherein, the backlight module is driven with the first backlight current during the driving period of the previous refresh frequency.

2. A display device control method, characterized in that: include: Real-time detection of the current refresh rate of the display device; Among them, if the current refresh frequency is lower than the previous refresh frequency, if and the current refresh frequency is lower than the first threshold, and the previous refresh frequency is lower than the first threshold, the backlight module is driven with a second backlight current, and the second backlight current is not less than the first backlight current, so that the display brightness at the current refresh frequency is equivalent to the display brightness at the previous refresh frequency; wherein, the backlight module is driven with the first backlight current during the driving period of the previous refresh frequency.

3. The display device control method according to claim 1 or 2, characterized in that: When the current refresh frequency is lower than the first threshold and not lower than the second threshold, the second backlight current is the first sub-current; when the current refresh frequency is lower than the second threshold, the second backlight current is the second sub-current, wherein the second threshold is lower than the first threshold, and wherein the first sub-current is lower than the second sub-current.

4. The display device control method according to claim 3, characterized in that: When the current refresh frequency is lower than a third threshold, the backlight module is driven with a third sub-current, wherein the third threshold is lower than the second threshold, the difference between the third threshold and the second threshold is greater than the difference between the second threshold and the first threshold, and the difference between the third sub-current and the second sub-current is greater than the difference between the second sub-current and the first sub-current.

5. The display device control method according to claim 3, characterized in that: Based on the first backlight current and the step-by-step correspondence between the backlight current and the refresh frequency at the same display brightness, the second backlight current is obtained by step-by-step regulation.

6. The display device control method according to claim 1 or 2, characterized in that: Based on the first backlight current and the one-to-one correspondence between the backlight current and the refresh frequency at the same display brightness, smooth adjustment is performed to obtain the second backlight current.

7. The display device control method according to claim 1 or 2, characterized in that: The corresponding relationship between the backlight current and the refresh frequency under the same display brightness is obtained in advance, and the backlight current corresponding to the current refresh frequency is obtained according to the corresponding relationship.

8. A display device, characterized in that: The display device comprises: Backlight module; A driving module, used for generating a backlight current; A multiplexer module is coupled to the backlight module and the driving module, and the multiplexer module modulates the backlight current to drive the backlight module to emit light; A processing module is coupled to the driving module and the multiplexer module; the processing module is used to detect the current refresh frequency of the display device in real time; when it is determined that the current refresh frequency is lower than the previous refresh frequency, if the current refresh frequency is lower than a first threshold value, and the previous refresh frequency is not lower than the first threshold value, a signal is sent to the multiplexer module to drive the multiplexer module to modulate the backlight current into a second backlight current, and the second backlight current is greater than the first backlight current, so that the display brightness at the current refresh frequency is equivalent to the display brightness at the previous refresh frequency; wherein, during the driving period of the previous refresh frequency, the multiplexer module modulates the backlight current into the first backlight current.

9. A display device, characterized in that: The display device comprises: Backlight module; A driving module, used for generating a backlight current; A multiplexer module is coupled to the backlight module and the driving module, and the multiplexer module modulates the backlight current to drive the backlight module to emit light; A processing module is coupled to the driving module and the multiplexer module; the processing module is used to detect the current refresh frequency of the display device in real time; when it is determined that the current refresh frequency is lower than the previous refresh frequency, if the current refresh frequency is lower than a first threshold value, and the previous refresh frequency is lower than the first threshold value, a signal is sent to the multiplexer module to drive the multiplexer module to modulate the backlight current into a second backlight current, and the second backlight current is not less than the first backlight current, so that the display brightness at the current refresh frequency is equivalent to the display brightness at the previous refresh frequency; wherein, during the driving period of the previous refresh frequency, the multiplexer module modulates the backlight current into the first backlight current.

10. The display device according to claim 8 or 9, characterized in that: The multiplexer module includes a plurality of resistance paths, each of which corresponds to a different refresh frequency. The processing module drives the multiplexer module to select the resistance path corresponding to the current refresh frequency according to the current refresh frequency.

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