Display control circuit with dynamic backlight adjustment mechanism and backlight control method thereof

Abstract

The present application provides a backlight control method with dynamic backlight adjustment mechanism, which is applied to a display control circuit. The backlight control method comprises: obtaining a frame refresh time length of a previous frame; at the beginning of a current frame, controlling a backlight module to output a stroboscopic backlight at a backlight-on time; when the actual picture display time reaches the frame refresh time length and a next frame has not started, controlling the backlight module to output a constant brightness backlight until the next frame starts; and when the actual picture display time has not reached the frame refresh time length and the next frame has started, controlling the backlight module to output the constant brightness backlight after reaching the frame refresh time length until a further next frame starts.

Description

TECHNICAL FIELD

[0001] The present application relates to display technology, and in particular, to a display control circuit with a dynamic backlight adjustment mechanism and a backlight control method thereof. BACKGROUND

[0002] In existing liquid crystal monitors, because the general frame refresh mode is a hold-type display, when an object in the picture is moving, dynamic blur is caused due to the inequality between the tracking speed of the naked eye and the refresh speed of the screen.

[0003] In order to solve the dynamic blur, the method for liquid crystal monitors is to use a strobe backlight, that is, to realize picture blackening by instantaneously turning on and off the backlight module, thereby reducing the blur phenomenon observed by the naked eye. However, when variable refresh rate (VRR) is applied, because the time of the frame dynamically changes, the backlight module will flicker due to the difficulty in maintaining the constant overall picture brightness. SUMMARY

[0004] In view of the problems of the prior art, one object of the present application is to provide a display control circuit with a dynamic backlight adjustment mechanism and a backlight control method thereof, to improve the prior art.

[0005] The present application includes a backlight control method with a dynamic backlight adjustment mechanism, which is applied to a display control circuit configured to receive image signals from an image source and to generate a plurality of frames to a display panel for display and to generate a backlight control signal to a backlight module for switching. The backlight control method includes: obtaining, by the display control circuit, a frame refresh time length of a previous frame; controlling, by the display control circuit at the start of a current frame, the backlight module to output a strobe backlight with a preset brightness at a backlight on time; determining, by the display control circuit, whether an actual picture display time of the current frame reaches the frame refresh time length and whether a next frame is started; controlling, by the display control circuit, the backlight module to output a constant brightness backlight with a compensation brightness to maintain the preset brightness until the start of the next frame when the actual picture display time reaches the frame refresh time length and the next frame has not started; and controlling, by the display control circuit, the backlight module to output the constant brightness backlight with the compensation brightness to maintain the preset brightness until the start of the next frame when the actual picture display time has not reached the frame refresh time length and the next frame has started.

[0006] The present application also includes a display control circuit with a dynamic backlight adjustment mechanism, which is electrically coupled to a display panel and a backlight module. The display control circuit is configured to: receive image signals from an image source and generate a plurality of frames to the display panel for display and generate backlight control signals to the backlight module for switching operation; obtain a frame refresh time length of a previous frame; at the beginning of a current frame, control the backlight module to output a strobe backlight with a preset brightness during a backlight-on time; determine whether an actual picture display time of the current frame reaches the frame refresh time length and whether a next frame is started; when the actual picture display time reaches the frame refresh time length and the next frame has not started, control the backlight module to output a constant brightness backlight with a compensation brightness to maintain the preset brightness until the next frame is started; and when the actual picture display time has not reached the frame refresh time length and the next frame has been started, control the backlight module to output the constant brightness backlight with the compensation brightness to maintain the preset brightness until a frame after the next frame is started.

[0007] The features, implementations, and effects of the present application are described in detail below with reference to the preferred embodiments and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 A module diagram of a display device according to an embodiment of the present application;

[0009] Figure 2 A timing diagram related to the operation of a display device according to an embodiment of the present application;

[0010] Figure 3 An actual output waveform when the display control circuit controls the backlight module to output a constant brightness backlight according to an embodiment of the present application;

[0011] Figure 4 A timing diagram related to the operation of a display device according to another embodiment of the present application; and

[0012] Figure 5 A flowchart of a backlight control method with a dynamic backlight adjustment mechanism according to an embodiment of the present application. DETAILED DESCRIPTION

[0013] One object of the present application is to provide a display control circuit with a dynamic backlight adjustment mechanism and a backlight control method thereof. Through the operation of the display control circuit, the backlight module can maintain the same average brightness with the dynamic backlight adjustment mechanism when the refresh frequency of the frame changes, thereby realizing a strobe backlight.

[0014] Please refer to Figure 1 . Figure 1A module diagram of a display device 100 according to an embodiment of the present application. The display device 100 comprises a display control circuit 110 with a dynamic backlight adjustment mechanism, a display panel 120, and a backlight module 130.

[0015] In an embodiment, the display control circuit 110 is a scaler, however the present application is not limited thereto. The display control circuit 110 is electrically coupled to the display panel 120 and the backlight module 130 within the display device 100, and is coupled to an image source HS (e.g. a host) on the display device 100. The display control circuit 110 is configured to receive an image signal IS from the image source HS, and to generate a plurality of frames FD to the display panel 120 for display and a backlight control signal BS to the backlight module 130 for switching operation. In an embodiment, the display control circuit 110 is coupled to the display panel 120 through a display driving chip, and is coupled to the backlight module 130 through a backlight driving chip, however the present application is not limited thereto.

[0016] In another embodiment, the display panel 120 and the backlight module 130 are integrated in the same display module, however the present application is not limited thereto.

[0017] In more detail, the display control circuit 110 causes the display panel 120 to receive the frames FD to display a plurality of frames in different frame refresh times according to frame refresh frequencies. The length of each frame refresh time is the inverse of the corresponding frame refresh frequency. In an embodiment, the frame refresh frequencies can be varied as required, and thus the lengths of the frame refresh times will also vary with the variation of the frame refresh frequencies.

[0018] On the other hand, to solve the dynamic blur caused by the mismatch between the human eye tracking speed and the display refresh speed, the display control circuit 110 can adopt a strobe backlight manner, and controls the backlight module 130 through the backlight control signal BS to turn on the backlight corresponding to the frames in the backlight on time in each refresh time, to provide a light source to light up the display panel 120 and to turn off outside the backlight on time.

[0019] Reference is made to Figure 2 which details the operation manner of the dynamic backlight adjustment mechanism of the display device 100.

[0020] Reference is made to Figure 2 . Figure 2 A timing diagram related to the operation of the display device 100 according to an embodiment of the present application.

[0021] In Figure 2In the figure, the operation timing corresponding to the display panel 120 and the operation timing corresponding to the backlight module 130 are mainly shown. As for the operation timing corresponding to the display panel 120, Figure 2 The frame refresh time TP1~TP5 of the multiple frames FR1~FR5 are shown in the figure. As for the operation timing corresponding to the backlight module 130, Figure 2 The backlight-on intervals corresponding to the multiple backlight-on times TB1~TB5 are shown, in which the height of the backlight-on intervals represents the brightness of the backlight module 130.

[0022] As mentioned before, the display control circuit 110 can generate different frames FR1~FR5 in the frame FD within the frame refresh time TP1~TP5 according to the frame refresh frequency after receiving the image signal IS, in which the refresh time starting point TI1~TI5 of the refresh time TP1~TP5 of each frame is defined by the vertical synchronization signal (V-sync) (as shown by the signal in the upper half of the figure). Figure 2 Each refresh time TP1~TP5 has a frame refresh time length RL1~RL5, and the reciprocal of the frame refresh time length RL1~RL5 corresponds to the frame refresh frequency.

[0023] In addition, the display control circuit 110 can control the backlight module 130 to be turned on in the backlight-on time TB1~TB5. In which, between the backlight time starting point BI1~BI5 of each backlight-on time TB1~TB5 and the refresh time starting point TI1~TI5 of each frame refresh time TP1~TP5 corresponding thereto, there is a starting time length IL1~IL5 respectively. Each backlight-on time TB1~TB5 has an on time length BL1~BL5.

[0024] In the embodiment, each frame FR1 and FR2 is displayed at a first frame refresh frequency, while each frame FR3 to FR5 is displayed at a second frame refresh frequency, and the second frame refresh frequency is smaller than the first frame refresh frequency. Therefore, the frame refresh time length RL3 to RL5 of each frame FR3 to FR5 is greater than the frame refresh time length RL1 and RL2 of each frame FR1 and FR2.

[0025] The following will be described by taking the frame FR3 as an example of the current frame. In such a case, the frame FR2 is the previous frame, and the frame FR4 is the next frame.

[0026] First, the display control circuit 110 obtains the frame refresh time length RL2 of the previous frame FR2.

[0027] In an embodiment, the display control circuit 110 accumulates the horizontal synchronization signal (H-sync, not shown in the figure) of the previous frame RF2 to obtain the frame refresh time length RL2.

[0028] In another embodiment, the display control circuit 110 can also directly extract the refresh frequency information (not shown in the figure) from the image signal IS to obtain the frame refresh time length RL2 under the condition that the image source HS capability allows. Figure 1

[0029] At the beginning of the current frame FR3, the display control circuit 110 controls the backlight module 130 to output the stroboscopic backlight with the preset brightness DB at the backlight-on time TB3. The time parameters of the backlight-on time TB3 are set according to the preset time ratio parameters relative to the frame refresh time length RL2.

[0030] In an embodiment, the time parameters include the start time length and the on time length, and the preset time ratio parameters include the start time ratio and the on time ratio.

[0031] The start time ratio determines the ratio between the length of the backlight time start point of the backlight-on time relative to the refresh time start point of the frame refresh time and the length of the frame refresh time. Taking the current frame FR2 as an example, this ratio is the ratio between the start time length IL2 of the backlight time start point BI2 of the backlight-on time TB2 relative to the refresh time start point TI2 of the frame refresh time TP2 and the frame refresh time length RL2 of the frame refresh time TP2, i.e. IL2 / RL2.

[0032] The on time ratio is the ratio between the length of the backlight-on time and the length of the frame refresh time. Taking the current frame FR3 as an example, it is the ratio between the on time length BL2 of the backlight-on time TB2 and the frame refresh time length RL2 of the frame refresh time TP2, i.e. BL2 / RL2.

[0033] In an embodiment, in order to make the backlight provided by the backlight module 130 have a consistent brightness (e.g. the preset brightness DB), the fixed preset time ratio parameters are set relative to the frame refresh time length for each frame.

[0034] Therefore, corresponding to the current frame FR3, the display control circuit 110 sets the start time length IL3 relative to the frame refresh time length RL2 according to the start time ratio, so that the start time length IL3 is equal to the start time length IL2. And, corresponding to the current frame FR3, the display control circuit 110 sets the on time length BL3 relative to the frame refresh time length RL2 according to the on time ratio, so that the on time length BL3 is equal to the on time length BL2.

[0035] Then, the display control circuit 110 judges whether the actual picture display time of the current frame FR3 reaches the frame refresh time length and whether the next frame FR4 is started.

[0036] As Figure 2 ​As shown, in the frame refresh time TP3 corresponding to the frame FR3, a first interval IN1 with a length equal to the frame refresh time length RL2 is included. At the end of the first interval IN1, the display control circuit 110 judges that the actual picture display time of the current frame FR3 reaches the frame refresh time length RL2 and the next frame FR4 has not yet started, and controls the backlight module 130 to output constant brightness backlight with a compensation brightness to maintain the preset brightness until the next frame FR4 starts.

[0037] Therefore, in the second interval IN2 between the end of the frame refresh time TP3 from the first interval IN1 and the start of the frame FR4, the backlight module 130 outputs constant brightness backlight with a compensation brightness AB. In an embodiment, the size of the compensation brightness AB is equal to the size of the average brightness of the stroboscopic backlight output in the first interval IN1 in the backlight on time TB3.

[0038] Please refer to Figure 3 . Figure 3 The actual output waveform 300 when the display control circuit 110 controls the backlight module 130 to output constant brightness backlight according to an embodiment of the present application is shown.

[0039] As Figure 3 shown, when the display control circuit 110 controls the backlight module 130 to output constant brightness backlight with a compensation brightness, the actual output waveform 300 of the constant brightness backlight can be output according to a pulse width modulation (PWM) waveform with a pulse width greater than the preset frequency, and the pulse width modulation waveform has the same duty cycle as the stroboscopic backlight. Figure 2 The compensation brightness AB in the actual output waveform 300 is the equivalent value of the brightness of the actual output waveform 300.

[0040] By adopting such constant brightness backlight that can vary with the actual picture display time, the brightness of the overall picture can be maintained constant without flickering.

[0041] After the start of the next frame FR4, the display control circuit 110 sets the frame FR4 as the current frame and sets the frame FR3 as the previous frame for processing.

[0042] At this time, the display control circuit 110 obtains the frame refresh time length RL3 of the previous frame FR3. At the start of the current frame FR4, the display control circuit 110 controls the backlight module 130 to output stroboscopic backlight with a preset brightness DB in the backlight on time TB4, wherein the time parameters of the backlight on time TB4 are set according to the preset time proportion parameters relative to the frame refresh time length RL3. The content of the preset time proportion parameters and the setting of the time parameters are similar to the previous description and will not be repeated here.

[0043] Therefore, corresponding to the current frame FR4, the display control circuit 110 sets the starting time length IL4 according to the ratio of the starting time to the frame refresh time length RL3, so that the starting time length IL4 is greater than the starting time length IL3. Furthermore, corresponding to the current frame FR4, the display control circuit 110 sets the on-time length BL4 according to the ratio of the on-time to the frame refresh time length RL3, so that the on-time length BL4 is greater than the on-time length BL3.

[0044] However, since the start time ratio and the on time ratio are fixed, the average brightness of the backlight module 130 corresponding to frame FR4 and frame FR3 is actually the same.

[0045] Next, the display control circuit 110 determines whether the actual display time of the current frame FR4 has reached the frame refresh time length and whether the next frame FR5 has started.

[0046] When the actual screen display time reaches the frame refresh time length RL4 and the next frame FR5 begins, the display control circuit 110 does not perform compensation. After the next frame FR5 begins, the display control circuit 110 can continue to set frame FR5 as the current frame and set frame FR4 as the previous frame for processing, which will not be elaborated here.

[0047] Please refer to Figure 4 . Figure 4 This is a timing diagram related to the operation of the display device 100, as shown in another embodiment of the present invention.

[0048] and Figure 2 similar, Figure 4 The diagram shows the refresh times TP1-TP5 for multiple frames FR1-FR5 and the backlight on-time intervals TB1-TB3 and TB5, where the height of these backlight on-time intervals represents the brightness of the backlight module 130. The definitions of the parameters related to the refresh times TP1-TP5 and the backlight on-time intervals TB1-TB3 and TB5 are as follows: Figure 2 The same applies, so I won't repeat it here.

[0049] In this embodiment, frames FR1 and FR2 are displayed at a first frame refresh rate, while frames FR3 to FR5 are displayed at a second frame refresh rate, and the second frame refresh rate is greater than the first frame refresh rate. Therefore, the frame refresh time lengths RL3 to RL5 of frames FR3 to FR5 are less than the frame refresh time lengths RL1 and RL2 of frames FR1 and FR2.

[0050] The following explanation will use the case where frame FR3 is the current frame as an example. In this case, frame FR2 is the previous frame, and frame FR4 is the next frame.

[0051] First, the display control circuit 110 obtains the frame refresh time length RL2 of the previous frame FR2. At the start of the current frame FR3, the display control circuit 110 controls the backlight module 130 to output a flickering backlight with a preset brightness dB at the backlight on-time TB3. Multiple time parameters of the backlight on-time TB3 are set according to multiple preset time ratio parameters relative to the frame refresh time length RL2. The content of the preset time ratio parameters and the setting of the time parameters are largely the same as previously described and will not be repeated here.

[0052] Next, the display control circuit 110 determines whether the actual display time of the current frame FR3 has reached the frame refresh time length and whether the next frame FR4 has started.

[0053] like Figure 4 As shown, the frame refresh times TP3 and TP4 of corresponding frames FR3 and FR4 include a first interval IN1 with a length equal to the frame refresh time length RL2. When the next frame FR4 begins, the display control circuit 110 determines that the actual screen display time has not yet reached the frame refresh time length RL2 and the next frame FR4 has already started, and controls the backlight module 130 to output a constant backlight with compensated brightness after the frame refresh time length RL2 is reached to maintain the preset brightness until the next frame FR5 begins.

[0054] Therefore, during the second interval IN2, which is between the end of the first interval IN1 and the start of frame FR5 during frame refresh time TP3, the backlight module 130 outputs a constant-brightness backlight with compensated brightness AB. The output method of the constant-brightness backlight and the setting of the compensated brightness AB are largely the same as previously described and will not be repeated here.

[0055] After the next frame FR5 begins, the display control circuit 110 sets frame FR5 as the current frame and sets frame FR4 as the previous frame for processing.

[0056] At this time, the display control circuit 110 obtains the frame refresh time length RL4 of the previous frame FR4. At the start of the current frame FR5, the display control circuit 110 controls the backlight module 130 to output a flickering backlight with a preset brightness DB at the backlight on-time TB4, wherein multiple time parameters of the backlight on-time TB5 are set according to multiple preset time ratio parameters relative to the frame refresh time length RL4.

[0057] Therefore, corresponding to the current frame FR5, the display control circuit 110 sets the start time length IL5 to be less than the start time length IL3 according to the start time ratio relative to the frame refresh time length RL4. Also, corresponding to the current frame FR5, the display control circuit 110 sets the on time length BL5 to be less than the on time length BL3 according to the on time ratio relative to the frame refresh time length RL4. However, since the start time ratio and the on time ratio are fixed, the average brightness of the backlight module 130 corresponding to the frame FR5 and the first interval IN1 is actually the same.

[0058] Next, if there is a subsequent frame to the frame FR5, the display control circuit 110 can set the subsequent frame as the current frame and set the frame FR5 as the previous frame for processing, which will not be described here.

[0059] The display device of the present application can enable the backlight module to maintain the same average brightness by the dynamic backlight adjustment mechanism when the refresh frequency of the frame changes through the operation of the display control circuit described above, thereby realizing the stroboscopic backlight.

[0060] Please refer to Figure 5 . Figure 5 FIG. 5 is a flowchart illustrating a backlight control method 500 with a dynamic backlight adjustment mechanism according to an embodiment of the present application.

[0061] In addition to the above-mentioned device, the present application further discloses a backlight control method 500 applied to, for example, but not limited to, the display device 100. An embodiment of the backlight control method 500 is shown in FIG. 5, which includes the following steps: Figure 1 Figure 5

[0062] Step S510, the display control circuit 110 obtains the frame refresh time length of the previous frame.

[0063] Step S520, the display control circuit 110 controls the backlight module 130 to output the stroboscopic backlight with the preset brightness according to the frame refresh time length and a plurality of preset time ratio parameters at the start of the current frame.

[0064] Step S530, the display control circuit 110 determines whether the actual picture display time of the current frame reaches the frame refresh time length.

[0065] Step S540, the display control circuit 110 determines whether the next frame is started when the actual picture display time has reached the frame refresh time length.

[0066] ​​Step S550, when the actual picture display time has reached the frame refresh time length and the next frame has not started, the display control circuit 110 controls the backlight module 130 to output constant brightness backlight with compensated brightness to maintain the preset brightness until the next frame starts.

[0067] Step S555, when the next frame starts, the display control circuit 110 sets the current frame as the previous frame and sets the next frame as the current frame. The flow will further return to step S510 to perform the backlight control method 500.

[0068] Step S560, when the actual picture display time has reached the frame refresh time length and the next frame starts, the display control circuit 110 does not perform compensation.

[0069] Step S565, the display control circuit 110 sets the current frame as the previous frame and sets the next frame as the current frame. The flow will further return to step S510 to perform the backlight control method 500.

[0070] Step S570, when the actual picture display time of the current frame has not reached the frame refresh time length, the display control circuit 110 judges whether the next frame starts.

[0071] Step S580, when the actual picture display time has not reached the frame refresh time length and the next frame has started, the display control circuit 110 controls the backlight module 130 to output constant brightness backlight with compensated brightness to maintain the preset brightness until the next frame starts after reaching the frame refresh time length.

[0072] Step S585, the display control circuit 110 sets the next frame as the previous frame and sets the next frame as the current frame. The flow will further return to step S510 to perform the backlight control method 500.

[0073] When step S570 judges that the actual picture display time of the current frame has not reached the frame refresh time length and the next frame has not started, the flow will return to step S530 for judgment.

[0074] It is noted that the above embodiments are only examples. In other embodiments, those skilled in the art with ordinary knowledge can make changes and modifications without departing from the spirit of the present application. In addition, each of the above methods can be realized by hardware, software or firmware according to the designer's needs.

[0075] In summary, the display control circuit with dynamic backlight adjustment mechanism and the backlight control method thereof can maintain the same average brightness when the refresh frequency of the frame changes, thereby realizing the frequency flicker backlight.

[0076] Although the embodiments of the present application have been described above, these embodiments are not intended to limit the present application, and a person having ordinary knowledge in the art can make various changes to the technical features of the present application according to the content explicitly or implicitly shown in the present application, and these changes can all belong to the scope of the patent protection sought for the present application. In other words, the scope of the patent protection of the present application should be defined according to the claims of the present application.

[0077] BRIEF DESCRIPTION OF DRAWINGS

[0078] 100: display device

[0079] 110: display control circuit

[0080] 120: display panel

[0081] 130: backlight module

[0082] 300: actual output waveform

[0083] 500: backlight control method

[0084] S510-S585: steps

[0085] AB: compensation brightness

[0086] BI1-BI5: backlight time start point

[0087] BL1-BL5: ON time length

[0088] BS: backlight control signal

[0089] DB: preset brightness

[0090] FD: frame

[0091] FR1-FR5: frame

[0092] HS: image source

[0093] IL1-IL5: start time length

[0094] IS: image signal

[0095] IN1: first interval

[0096] IN2: second interval

[0097] RL1-RL5: frame refresh time length

[0098] TB1-TB5: backlight ON time

[0099] TI1-TI5: refresh time start point

[0100] TP1-TP5: frame refresh time

Claims

1. A backlight control method with a dynamic backlight adjustment mechanism, applied to a display control circuit configured to receive a video signal from an image source and to generate a plurality of frames to a display panel for display and a backlight control signal to a backlight module for switching operation, the backlight control method comprising: obtaining, by the display control circuit, a frame refresh time length of a previous frame; controlling, by the display control circuit at a start of a current frame, the backlight module to output a strobe backlight with a preset brightness during a backlight on time; determining, by the display control circuit, whether an actual picture display time of the current frame reaches the frame refresh time length and whether a next frame is started; controlling, by the display control circuit, the backlight module to output a constant backlight with a compensation brightness to maintain the preset brightness until the next frame is started when the actual picture display time reaches the frame refresh time length and the next frame is not started yet; and controlling, by the display control circuit, the backlight module to output the constant backlight with the compensation brightness to maintain the preset brightness until a further next frame is started when the actual picture display time does not reach the frame refresh time length and the next frame is started. a plurality of time parameters of the backlight on time are set according to the frame refresh time length and a plurality of preset time ratio parameters, the plurality of time parameters including a start time length and an on time length, the plurality of preset time ratio parameters including a start time ratio and an on time ratio; 2. The backlight control method according to claim 1, wherein the start time ratio determines a ratio between the start time length of a backlight time start point of the backlight on time relative to a refresh time start point of a frame refresh time and the frame refresh time length; and the on time ratio determines a ratio between the on time length of the backlight on time and the frame refresh time length. further comprising:

3. The backlight control method according to claim 1, wherein accumulating, by the display control circuit, a horizontal synchronization signal of the previous frame to obtain the frame refresh time length. further comprising:

4. The backlight control method according to claim 1, wherein extracting, by the display control circuit, a refresh frequency information from the video signal to obtain the frame refresh time length. further comprising:

5. The backlight control method according to claim 1, wherein not compensating, by the display control circuit, when the actual picture display time reaches the frame refresh time length and the next frame is started. further comprising:

6. The backlight control method according to claim 1, wherein outputting, by the display control circuit, the constant backlight according to a pulse width modulation waveform when controlling the backlight module to output the constant backlight with the compensation brightness, and the pulse width modulation waveform has a same duty cycle as the strobe backlight. a size of the compensation brightness is equal to a size of an average brightness of the strobe backlight in the frame refresh time length.

7. The backlight control method of claim 1, wherein further comprising:

8. The backlight control method of claim 1, wherein, determining, by the display control circuit, whether the next frame is started according to whether a vertical synchronization signal is received. further comprising:

9. The backlight control method of claim 1, wherein, ​ setting, by the display control circuit, the current frame as the previous frame and the next frame as the current frame when the actual picture display time reaches the frame refresh time length and the next frame starts; setting, by the display control circuit, the current frame as the previous frame and the next frame as the current frame when the display control circuit controls the backlight module to output the constant brightness backlight until the next frame starts; and setting, by the display control circuit, the next frame as the previous frame and the re- next frame as the current frame when the display control circuit controls the backlight module to output the constant brightness backlight until the re- next frame starts.

10. A display control circuit with a dynamic backlight adjustment mechanism, electrically coupled to a display panel and a backlight module, configured to: receive an image signal from an image source and generate frames to the display panel for display and a backlight control signal to the backlight module for switching; obtain a frame refresh time length of a previous frame; control the backlight module to output a stroboscopic backlight with a preset brightness for a backlight on time when a current frame starts; determine whether an actual picture display time of the current frame reaches the frame refresh time length and a next frame starts; control the backlight module to output a constant brightness backlight with a compensation brightness to maintain the preset brightness until the next frame starts when the actual picture display time reaches the frame refresh time length and the next frame has not started; and control the backlight module to output the constant brightness backlight with the compensation brightness to maintain the preset brightness until a re- next frame starts when the actual picture display time has not reached the frame refresh time length and the next frame has started.

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