Display device and driving method thereof

Abstract

The invention provides a display device and a driving method thereof. The display device comprises a display panel and a driving circuit, wherein the driving circuit comprises a refresh rate detection module and a reversal control module. The refresh rate detection module measures the high-level duration of an initial signal of the display device and calculates the current refresh rate of the display device according to the high-level duration. When the current refresh rate is higher than a first preset threshold value, the inversion control module controls the pixel electrode of the display panel to invert the polarity once every two frames. According to the technical scheme of the invention, the control mode that the polarity of every two frames is reversed once is adopted at the high refresh rate, so that the brightness variation under the high refresh rate is close to the brightness variation under the low refresh rate, and the display effect under the variable refresh rate mode is improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display device and a driving method thereof. Background Art

[0002] Variable refresh rate (VRR) technology is a technology that changes the refresh rate of the LCD panel based on the changes in the image data input by the front end. Under VRR technology, the refresh rate of the LCD panel will change dynamically according to the display content. However, due to the structural characteristics of the LCD panel, the brightness will change at different refresh rates, such as Figure 1 , Figure 2 and Figure 3 When the refresh rate changes suddenly, if the brightness changes greatly, the human eye will perceive obvious flicker, affecting the display effect.

[0003] At present, the mainstream brightness compensation scheme is to compensate the average brightness at each refresh rate to the same brightness value. However, due to the different brightness fluctuations at different refresh rates, even if the average brightness at each refresh rate is compensated to be consistent, the ideal display effect cannot be obtained. This is because at different refresh rates, the pixel electrode maintains the voltage for different times, resulting in differences in the degree of deflection of the liquid crystal molecules, which causes different degrees of brightness fluctuations. This brightness fluctuation will result in different visibility of the human eye, making it difficult to obtain a good display effect. Summary of the invention

[0004] An object of the present invention is to provide a display device and a driving method thereof to improve the display effect in a variable refresh rate mode.

[0005] An embodiment of the present application provides a display device, including a display panel and a driving circuit, the driving circuit including: a refresh rate detection module, configured to measure the high-level duration of a start signal of the display device, and calculate the current refresh rate of the display device according to the high-level duration of the start signal; and a reversal control module, configured to control the pixel electrode of the display panel to reverse its polarity once every two frames when the current refresh rate is higher than a first preset threshold.

[0006] In the above display device, the first preset threshold is 120 Hz; the inversion control module is configured to control the pixel electrode to invert polarity once every two frames when the current refresh rate is higher than 120 Hz.

[0007] In the above display device, the inversion control module is further configured to control the pixel electrode to invert polarity once per frame when the current refresh rate is lower than a second preset threshold.

[0008] In the above display device, the second preset threshold is 60 Hz; the inversion control module is further configured to control the pixel electrode to invert polarity once per frame when the current refresh rate is not greater than 60 Hz.

[0009] In the above display device, the inversion control module is further configured to control the pixel electrode to invert polarity twice every three frames when the current refresh rate is greater than the second preset threshold and not greater than the first preset threshold.

[0010] An embodiment of the present application also provides a method for driving a display device, comprising: measuring the high-level duration of a start signal of the display device; calculating the current refresh rate of the display device based on the high-level duration of the start signal; and when the current refresh rate is higher than a first preset threshold, controlling the pixel electrodes of the display panel of the display device to reverse their polarity once every two frames.

[0011] In the driving method of the above display device, the first preset threshold is 120 Hz; when the current refresh rate is higher than 120 Hz, the pixel electrode is controlled to reverse its polarity once every two frames.

[0012] In the above-mentioned driving method of the display device, the driving method further includes: when the current refresh rate is lower than a second preset threshold, controlling the pixel electrode to reverse its polarity once per frame.

[0013] In the above-mentioned driving method of the display device, the second preset threshold is 60 Hz; when the current refresh rate is not greater than 60 Hz, the pixel electrode is controlled to reverse its polarity once per frame.

[0014] In the above-mentioned driving method of the display device, the driving method further includes: when the current refresh rate is greater than the second preset threshold and not greater than the first preset threshold, controlling the pixel electrode to reverse polarity twice every three frames.

[0015] In the display device and driving method thereof of the present application, a refresh rate detection module is used to measure the high-level duration of a start signal of the display device, and the current refresh rate of the display device is calculated based on the high-level duration. Then, when the current refresh rate is higher than a first preset threshold, the inversion control module controls the pixel electrodes of the display panel to reverse their polarity once every two frames, so that the brightness change under a high refresh rate is similar to the brightness change under a low refresh rate, thereby improving the display effect under the variable refresh rate mode.

[0016] In addition, the technical solution of the present application can also allow the liquid crystal molecules to have more time to complete the deflection, thereby reducing the brightness fluctuation under high refresh rate. This is because at a high refresh rate, if the polarity is still reversed once per frame, the liquid crystal molecules will not have time to fully respond to the voltage change, resulting in insufficient deflection and causing large brightness fluctuations. By extending the voltage maintenance time, the liquid crystal molecules can fully deflect, effectively reducing the brightness fluctuation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a simulation diagram of the brightness waveform curve of a display device at 48 Hz in the prior art.

[0018] Figure 2 It is a simulation diagram of the brightness waveform curve of a display device at 144 Hz in the prior art.

[0019] Figure 3 It is a schematic diagram comparing the average brightness of a display device in the prior art at 48 Hz and 144 Hz.

[0020] Figure 4 is a schematic diagram of a display device provided in an embodiment of the present application.

[0021] Figure 5 is a block diagram of a driving circuit in a display device provided in an embodiment of the present application.

[0022] Figure 6 It is a flow chart of a method for driving a display device provided in an embodiment of the present application.

[0023] Figure 7 It is a simulation diagram of the brightness waveform curve of the display device and the driving method thereof provided in the embodiments of the present application at 144 Hz.

[0024] Figure 8 It is a schematic diagram comparing the average brightness of the display device and the driving method thereof provided in the embodiments of the present application at 48 Hz and 144 Hz. DETAILED DESCRIPTION

[0025] The specific implementation methods of the present application are described in detail below with reference to the accompanying drawings.

[0026] The terms "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different technical features. The term "plurality" and similar words mean two or more, unless otherwise clearly defined.

[0027] The embodiments of the present application may be combined with each other.

[0028] The traditional technical solution is based on grayscale compensation, which attempts to compensate the average brightness of each frequency to the same brightness, but the brightness fluctuations at different frequencies are not the same. This is because the response speed and stability of liquid crystal molecules vary at different frequencies, resulting in different brightness fluctuations. Even if the average brightness compensation is consistent, it is difficult to obtain effective VRR results, because the brightness fluctuations are different at different frequencies, and there are differences in naked eye visibility, making it difficult for users to get a good naked eye experience. For example, at some high frequencies, although the average brightness is the same as at low frequencies, the brightness fluctuations are too drastic, causing the picture to flicker significantly and the visual effect to be poor.

[0029] like Figure 4 As shown, the display device provided in the embodiment of the present application includes a display panel, a timing controller TCON, a source driving circuit DD and a power management chip (not shown in the figure, the power management chip can be integrated with the timing controller TCON into the same chip). The display panel can be, for example, a liquid crystal display panel.

[0030] The display panel includes a display area and a non-display area. The display area is provided with m×n pixels P arranged in an array, where m and n are integers greater than 1. The non-display area is located around the display area and is used to arrange the drive circuit and various signal lines. The display panel also includes a plurality of scan lines (GL1~GLn), a plurality of data lines (DL1~DLm) and a gate drive circuit GOA. The plurality of scan lines (GL1~GLn) extend along a first direction and are arranged along a second direction, and the plurality of data lines (DL1~DLm) extend along a second direction and are arranged along the first direction, and the first direction is perpendicular to the second direction. The gate drive circuit GOA is arranged in the non-display area and is electrically connected to the plurality of scan lines (GL1~GLn). The source drive circuit DD is electrically connected to the plurality of data lines (DL1~DLm) through a flexible circuit board. The timing controller TCON is electrically connected to the gate drive circuit GOA and the source drive circuit DD respectively.

[0031] The display panel includes a thin film transistor array substrate, an opposing substrate, and a liquid crystal layer disposed between the two substrates. The thin film transistor array substrate includes a glass substrate, a first metal layer disposed on the glass substrate, a gate insulating layer GI disposed on the first metal layer, a semiconductor layer disposed on the gate insulating layer GI, a second metal layer disposed on the semiconductor layer, a passivation layer disposed on the second metal layer, and a pixel electrode disposed on the passivation layer. The first metal layer includes scan lines (GL1~GLn), gate electrodes, etc. The second metal layer includes data lines (DL1~DLm), source electrodes, drain electrodes, etc. The opposing substrate includes a glass substrate, a black matrix disposed on the glass substrate, a color filter layer disposed on the black matrix, and a common electrode disposed on the color filter layer.

[0032] Each pixel P includes at least one thin film transistor and a pixel electrode. The gate of the thin film transistor is electrically connected to the corresponding scan line, the source is electrically connected to the corresponding data line, and the drain is electrically connected to the corresponding pixel electrode. When the scan line outputs a high-level scan signal, the thin film transistor is turned on, and the data signal on the data line is transmitted to the pixel electrode through the thin film transistor; when the scan line outputs a low-level scan signal, the thin film transistor is turned off, and the pixel electrode maintains the voltage corresponding to the data signal.

[0033] The gate drive circuit GOA includes n-stage cascaded gate drive subcircuits, and each stage of the gate drive subcircuit is electrically connected to a scan line. Under the control of the timing controller TCON, the gate drive subcircuit outputs scan signals in sequence to scan each row of pixels P in the display area line by line. Under the control of the timing controller TCON, the source drive circuit DD generates and outputs data signals according to the image data. The timing controller TCON is used to receive and process externally input image data and timing signals, generate control signals, and transmit image data to the source drive circuit DD. The power management chip is used to provide operating voltages for various parts of the display device, including providing a common voltage for the common electrode of the liquid crystal display panel, providing a gate drive voltage for the gate drive circuit GOA, and providing a gamma voltage for the source drive circuit DD.

[0034] The embodiments of the present application are applicable to liquid crystal display devices (LCD, Liquid Crystal Display) using variable refresh rate (VRR, Variable Refresh Rate) technology. In VRR technology, the refresh rate of the display panel changes according to the changes in the image information input by the front end. However, due to the response characteristics of liquid crystal molecules, their brightness will also change to a certain extent at different refresh rates. When the refresh rate changes suddenly, if the brightness change is more serious, the human eye can easily detect the flicker phenomenon. This flicker not only affects the user's visual experience, but long-term viewing also leads to problems such as eye fatigue.

[0035] The embodiment of the present application determines the current refresh rate of the display device by measuring the high-level duration of the start signal of the display device. Specifically, when the high-level duration of the start signal is a microseconds, the current refresh rate of the display device is 144Hz; when the high-level duration of the start signal is 3a microseconds, the current refresh rate of the display device is 48Hz. A detection method based on the time-frequency correspondence relationship is adopted here, and the high-level duration of the start signal is used as the basis for determining the current refresh rate of the display device. After completing the judgment of the current refresh rate of the display device, when the current refresh rate of the display device is higher than the first preset threshold value, the technical solution of the present application is triggered. Specifically, the display device of this embodiment includes a display panel and a drive circuit. The drive circuit can be, for example, a combination of a gate drive circuit GOA, a source drive circuit DD and a timing controller TCON, such as Figure 5 and Figure 6 As shown, the driving circuit includes a refresh rate detection module 501 and a reversal control module 502. The refresh rate detection module 501 measures the high level duration of the start signal of the display device (step 601), and calculates the current refresh rate of the display device according to the high level duration of the start signal (step 602). The reversal control module 502 controls the reversal mode of the pixel electrode of the display panel according to the current refresh rate obtained by the refresh rate detection module 501. Specifically, when the current refresh rate of the display device is higher than the first preset threshold value, the reversal control module 502 controls the pixel electrode of the display panel to reverse its polarity once every two frames (step 603), so that the reversal modes of the high and low refresh rate pixel electrodes are different, so that the brightness change amount of the high refresh rate is closer to the brightness change amount of the low refresh rate, and finally the best visual effect under VRR is achieved. When the current refresh rate of the display device is lower than the second preset threshold, the inversion control module 502 controls the pixel electrodes of the display panel to reverse polarity once per frame (step 604); when the current refresh rate of the display device is higher than the second preset threshold and lower than the first preset threshold, the inversion control module 502 controls the pixel electrodes of the display panel to reverse polarity twice every three frames (step 605). For example, when the current refresh rate of the display device is higher than the first preset threshold, the pixel electrodes reverse polarity once every two frames instead of once every frame. This can make the change in brightness when the current refresh rate of the display device is higher than the first preset threshold closer to the change in brightness when the current refresh rate of the display device is lower than the second preset threshold. By comparing Figure 8 and Figure 3It can be seen that the difference △H2 between the average brightness value AVR3 of the brightness waveform L3 at a refresh rate of 144 Hz and the average brightness value AVR1 of the brightness waveform L1 at a refresh rate of 48 Hz of the display device using the technical solution of the present application is greater than the difference △H1 between the average brightness value AVR2 of the brightness waveform L2 at a refresh rate of 144 Hz and the average brightness value AVR1 of the brightness waveform L1 at a refresh rate of 48 Hz of the conventional technical solution. Among them, the simulation diagram of the brightness waveform L3 is as follows Figure 7 As shown, the simulation diagram of the brightness waveform curve L1 is as follows Figure 1 As shown, the simulation diagram of the brightness waveform curve L2 is as follows Figure 2 shown.

[0036] In order to accurately control the polarity reversal of the pixel electrode, the technical solution of the present application firstly adopts a method based on time measurement to detect the current refresh rate of the display device. Specifically, the current refresh rate is determined by analyzing the high level duration of the start signal.

[0037] In the principle of liquid crystal display, the pixel electrode controls the orientation of liquid crystal molecules by applying voltage, thereby changing the intensity of transmitted light and achieving the display of different grayscales and colors. After the polarity of the pixel electrode is reversed, the liquid crystal molecules begin to reorient themselves, and the length of time the voltage is maintained determines the final degree of deflection of the liquid crystal molecules, which directly affects the brightness.

[0038] The technical solution of the present application is based on this principle, and the orientation process of the liquid crystal molecules is adjusted by controlling the polarity reversal timing of the pixel electrode. When the voltage maintenance time changes, the final orientation state of the liquid crystal molecules will also change accordingly, which directly affects the display brightness. Therefore, by controlling the timing of polarity reversal, the display brightness can be effectively adjusted.

[0039] In the traditional technical solution, the pixel electrode reverses polarity every frame, and the brightness difference when the current refresh rate of the display device is higher than the first preset threshold and when the current refresh rate of the display device is lower than the second preset threshold is large; in the technical solution of the present application, the pixel electrode reverses polarity every two frames when the current refresh rate of the display device is higher than the first preset threshold, and the brightness change when the current refresh rate of the display device is higher than the first preset threshold and the brightness change when the current refresh rate of the display device is lower than the second preset threshold are closer. The display panel switches between 48Hz and 144Hz, which is equivalent to switching between 48Hz and 72Hz. The refresh rate switching range is smaller, the brightness change is smaller, and the visual effect is better. This shows that by adjusting the inversion method of the pixel electrode, the brightness difference between different refresh rates can be effectively reduced and the visual effect can be improved.

[0040] In actual applications, when the display device switches between 48Hz and 144Hz, due to the adoption of the polarity inversion control method of the present application, the display effect at 144Hz is closer to that at 72Hz, which is equivalent to reducing the switching range of the refresh rate from 96Hz (144Hz-48Hz) to 24Hz (72Hz-48Hz), greatly reducing the amplitude of brightness changes.

[0041] The embodiments of the present application are intended to adjust the brightness change and visual effect when the current refresh rate of the display device is higher than a first preset threshold value to be closer to the brightness change and visual effect when the current refresh rate of the display device is lower than a second preset threshold value, thereby reducing the difference in brightness change at high and low refresh rates, and allowing users to experience a stable and comfortable picture during the viewing process.

[0042] When the current refresh rate of the display device is higher than the first preset threshold, the inversion control module 502 controls the pixel electrode to adopt a two-frame inversion mode, that is, the control module controls the pixel electrode to reverse its polarity once every two frames (step 603). Specifically, the first preset threshold is 120Hz; when the current refresh rate is higher than 120Hz, the inversion control module 502 controls the pixel electrode to reverse its polarity once every two frames. This is because at a high refresh rate, the response speed of the liquid crystal molecules is relatively fast. If the polarity of the pixel electrode is reversed every frame, the brightness fluctuation will be large. The method of reversing the polarity once every two frames allows the liquid crystal molecules to have more time to complete the deflection, thereby reducing the brightness change.

[0043] The technical solution of this application is based on the response characteristics of liquid crystal molecules. At a high refresh rate, due to the short frame period, if the inversion mode is still used for each frame, the liquid crystal molecules do not have enough time to complete the full deflection, which will cause large brightness fluctuations. The two-frame inversion mode provides more sufficient response time for the liquid crystal molecules, effectively reducing the brightness fluctuations.

[0044] When the current refresh rate of the display device is lower than the second preset threshold, the single frame inversion mode is adopted, that is, the inversion control module 502 controls the pixel electrode to reverse its polarity once per frame (step 604). Specifically, the second preset threshold is 60Hz, and the inversion control module 502 controls the pixel electrode to reverse its polarity once per frame when the current refresh rate is not greater than 60Hz. At a lower refresh rate, the liquid crystal molecules have enough time to respond to the change in the polarity of the pixel electrode, and the single frame inversion meets the display requirements while ensuring the stability of the brightness.

[0045] When the current refresh rate of the display device is greater than the second preset threshold value and not greater than the first preset threshold value, the three-frame two-inversion mode is adopted, that is, the inversion control module 502 controls the pixel electrode to invert the polarity twice every three frames (step 605). Specifically, when the current refresh rate is greater than 60 Hz and not greater than 120 Hz, the inversion control module 502 controls the pixel electrode to invert the polarity twice every three frames. In this way, the brightness performance can be further optimized.

[0046] This application reduces the current refresh rate of the display device from 144Hz to 72Hz, and the refresh rate difference with 48Hz is reduced from 96Hz to 24Hz, thereby effectively reducing the brightness change when the refresh rate is switched, making the brightness changes at different refresh rates closer and improving the visual effect.

[0047] In order to verify the actual effect of the technical solution of the present application, rigorous experimental tests were carried out (the test environment can be, for example, 25°C ± 1°C, humidity 50% ± 5%). The test results show that when the current refresh rate of the display device is 144Hz, the flicker modulation amplitude (FMA) of the traditional solution is 8.2%, while the FMA of the technical solution of the present application is 3.1%; when the current refresh rate of the display device is 48Hz, the FMA of the traditional solution and the technical solution of the present application is 2.8%. The technical solution of the present application meets the technical goal of ΔFMA < 0.5%, indicating that the technical solution of the present application has a good effect in improving brightness fluctuations.

[0048] The setting of the first preset threshold of the present application is based on the physical properties of the liquid crystal molecules, especially their response time characteristics. Specifically, the first preset threshold f=1 / (2τ), where τ is the time required for the liquid crystal molecules to change from the initial orientation state to the target orientation state, which is the liquid crystal response time constant. By setting the threshold to half of the reciprocal of the liquid crystal response time constant, it is ensured that at a refresh rate higher than the threshold, the two-frame inversion mode can provide sufficient response time for the liquid crystal molecules.

[0049] In order to accurately detect the current refresh rate of the display device, the refresh rate detection module 501 includes a digital time conversion circuit and a data processing circuit. The digital time conversion circuit includes a clock signal generating unit and a counting unit. The clock signal generating unit uses a phase-locked loop circuit to generate a 400MHz clock signal as a clock reference signal of the counting unit. The counting unit receives the clock reference signal and the start signal, and counts the clock cycle of the clock reference signal during the period when the start signal is at a high level to obtain a count value, which is proportional to the high level duration of the start signal.

[0050] The data processing circuit includes a data cache unit and a data analysis unit. The data cache unit stores count values ​​within five consecutive cycles. The data analysis unit reads the five count values ​​stored in the data cache unit. When the five count values ​​are equal, the data analysis unit calculates the current refresh rate of the display device according to the count value, and sends the current refresh rate to the reversal control module 502. The reversal control module 502 controls the polarity reversal mode of the pixel electrode according to the received current refresh rate of the display device. By analyzing the data of five consecutive cycles, the misjudgment caused by the fluctuation of a single count value is avoided (effectively avoiding the influence of instantaneous fluctuations), which not only improves the reliability of detection, but also ensures the stability of polarity reversal control.

[0051] When the current refresh rate of the display device is higher than the first preset threshold, the inversion control module 502 controls the pixel electrode to invert polarity once every two frames. This is because when the current refresh rate of the display device is higher than the first preset threshold, the liquid crystal molecules cannot completely transform to the target orientation state within one frame. By controlling the pixel electrode to invert polarity once every two frames, the liquid crystal molecules have sufficient time to complete the orientation transformation, thereby ensuring the stability of the display brightness.

[0052] In the display device and driving method thereof of the present application, the high-level duration of the start signal of the display device is measured by the refresh rate detection module 501, and the current refresh rate of the display device is calculated based on the high-level duration. Then, when the current refresh rate is higher than the first preset threshold, the inversion control module 502 controls the pixel electrode of the display panel to reverse its polarity once every two frames, so that the brightness change under the high refresh rate is similar to the brightness change under the low refresh rate, thereby improving the display effect in the variable refresh rate mode.

[0053] In addition, the technical solution of the present application can also allow the liquid crystal molecules to have more time to complete the deflection, thereby reducing the brightness fluctuation under high refresh rate. This is because at a high refresh rate, if the polarity is still reversed once per frame, the liquid crystal molecules will not have time to fully respond to the voltage change, resulting in insufficient deflection and causing large brightness fluctuations. By extending the voltage maintenance time, the liquid crystal molecules can fully deflect, effectively reducing the brightness fluctuation.

[0054] When displaying high-dynamic images, pixel electrodes in different areas require different inversion modes to optimize brightness performance, but the current technical solution uses a unified inversion mode, which cannot meet the optimal display requirements of local areas. For example, when there are both high-brightness and low-brightness areas in the picture, the unified inversion mode causes large fluctuations in brightness in the highlight area. In addition, when displaying moving pictures, different areas in the picture have different degrees of motion blur, and a unified inversion mode makes it difficult to optimize the display effect of each area in a targeted manner.

[0055] In view of the above technical problems, as an improvement, the present application proposes a refined control scheme based on area division. Specifically, the display area of ​​the display panel is divided into J×K sub-areas, where J and K are integers greater than 1. Each sub-area includes P×Q pixels, where P and Q are integers greater than 1. For example, a display panel with a resolution of 1920×1080 is divided into 4×3 sub-areas, each of which contains 480×360 pixels.

[0056] Each sub-region is provided with an independent regional control unit, which includes a regional refresh rate detection module, a regional inversion control module, a boundary processing unit and a dynamic adjustment unit.

[0057] The regional refresh rate detection module includes a digital time conversion circuit and a data processing circuit. The digital time conversion circuit uses a phase-locked loop circuit to generate a 400MHz clock signal as a clock reference signal to measure the high-level duration of the sub-region start signal. The data processing circuit analyzes the measurement values ​​of 5 consecutive cycles to ensure the accuracy of the detection results.

[0058] The regional inversion control module selects a polarity inversion mode according to the detected refresh rate: when the refresh rate of the sub-region is higher than 120Hz, the pixel electrode of the sub-region is controlled to reverse its polarity once every two frames; when the refresh rate of the sub-region is lower than 60Hz, the pixel electrode of the sub-region is controlled to reverse its polarity once every frame; when the refresh rate of the sub-region is greater than 60Hz and not greater than 120Hz, the pixel electrode of the sub-region is controlled to reverse its polarity twice every three frames.

[0059] The boundary processing unit processes the transition between adjacent sub-regions. When adjacent sub-regions use different inversion modes, the boundary processing unit sets a transition zone with a width of 2 to 3 pixels at the boundary pixels, and gradually adjusts the parameters of the inversion mode within the transition zone to avoid obvious dividing lines.

[0060] The dynamic adjustment unit monitors the picture characteristics in the sub-area in real time, including the average brightness level, brightness change amplitude and motion vector size, and adjusts the inversion timing and transition time of the inversion mode according to these characteristic parameters.

[0061] Specifically, the regional refresh rate detection modules of each sub-region start working at the same time and continuously monitor the refresh rate of the region; the data processing circuit filters and verifies the measurement results; the regional inversion control module selects the inversion mode according to the detected refresh rate; the boundary processing unit calculates and applies the transition algorithm in real time; and the dynamic adjustment unit adjusts the control parameters according to the picture characteristics.

[0062] Experimental data show that when displaying high-dynamic images, the flicker modulation amplitude of each area is improved after adopting this solution, the overall look and feel of the image is more natural, and the motion blur phenomenon is significantly reduced.

[0063] The embodiments of the present application are described in detail above, and the contents of this specification should not be construed as limiting the scope of protection of the present application.

Claims

1. A display device, comprising a display panel and a driving circuit, characterized in that: The driving circuit comprises: a refresh rate detection module, configured to measure a high level duration of a start signal of the display device, and calculate a current refresh rate of the display device according to the high level duration of the start signal; and The inversion control module is configured to control the pixel electrodes of the display panel to invert polarity once every two frames when the current refresh rate is higher than a first preset threshold.

2. The display device according to claim 1, characterized in that The first preset threshold is 120 Hz; The inversion control module is configured to control the pixel electrode to invert polarity once every two frames when the current refresh rate is higher than 120 Hz.

3. The display device according to claim 1, characterized in that The inversion control module is further configured to control the pixel electrode to invert polarity once per frame when the current refresh rate is lower than a second preset threshold.

4. The display device according to claim 3, characterized in that: The second preset threshold is 60 Hz; The inversion control module is further configured to control the pixel electrode to invert polarity once per frame when the current refresh rate is not greater than 60 Hz.

5. The display device according to claim 4, characterized in that: The inversion control module is further configured to control the pixel electrode to invert polarity twice every three frames when the current refresh rate is greater than the second preset threshold and not greater than the first preset threshold.

6. A method for driving a display device, characterized in that: include: Measuring the high level duration of the start signal of the display device; Calculating the current refresh rate of the display device according to the high level duration of the start signal; as well as When the current refresh rate is higher than a first preset threshold, the pixel electrodes of the display panel of the display device are controlled to invert polarity once every two frames.

7. The method for driving a display device according to claim 6, wherein: The first preset threshold is 120 Hz; When the current refresh rate is higher than 120 Hz, the pixel electrode is controlled to reverse its polarity every two frames.

8. The method for driving a display device according to claim 6, wherein: The driving method further includes: When the current refresh rate is lower than a second preset threshold, the pixel electrode is controlled to reverse polarity once per frame.

9. The method for driving a display device according to claim 8, characterized in that: The second preset threshold is 60 Hz; When the current refresh rate is not greater than 60 Hz, the pixel electrode is controlled to reverse polarity once per frame.

10. The method for driving a display device according to claim 9, characterized in that: The driving method further includes: When the current refresh rate is greater than the second preset threshold and not greater than the first preset threshold, the pixel electrode is controlled to invert polarity twice every three frames.

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