Backlight driving method, timing controller, and display device

Abstract

A backlight driving method, a timing controller (100), and a display device. The backlight driving method comprises: when current frame data (S0) is acquired, determining compensated current frame data (S1) on the basis of a luminance difference between previous frame data and the current frame data (S0); outputting partial-dimming data (S2) to a backlight unit (200) on the basis of the compensated current frame data (S1), wherein the partial-dimming data (S2) is used for driving the backlight unit (200) to emit light; and outputting the compensated current frame data (S1) to a liquid crystal display apparatus (300), such that the liquid crystal display apparatus (300) performs display on the basis of the compensated current frame data (S1). In this way, the ghosting phenomenon in the backlight unit (200) and the liquid crystal display apparatus (300) is ameliorated, thereby improving the display effect of the display device.

Description

A backlight driving method, timing controller and display device

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202410703028.5, filed on May 31, 2024, entitled "A Backlight Driving Method, Timing Controller and Display Device", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to the field of display technology, and more particularly to a backlight driving method, timing controller, and display device. Background Technology

[0004] Liquid crystal display devices include a liquid crystal display unit and a backlight unit. When driving the backlight unit to emit light, it can be considered as driving it frame by frame, so that the backlight unit's emission state in each frame can be regarded as displaying one frame of an image. Furthermore, there may be an overlap between the previous frame and the current frame, causing the previous frame to not disappear immediately. The visual effect appears simultaneously with the current frame, while the previous frame gradually disappears. This phenomenon is called image retention, causing image retention when the backlight unit emits light. Therefore, how to eliminate image retention in the backlight unit and improve its emission effect has become an urgent problem to be solved in this field. Summary of the Invention

[0005] This invention provides a backlight driving method, a timing controller, and a display device to eliminate image retention in the backlight unit and improve the luminous effect of the backlight unit.

[0006] In a first aspect, embodiments of the present invention provide a backlight driving method, comprising:

[0007] When the current frame data is obtained, the compensated current frame data is determined based on the brightness difference between the previous frame data and the current frame data.

[0008] Based on the compensated current frame data, local dimming data is output to the backlight unit; the local dimming data is used to drive the backlight unit to emit light.

[0009] The compensated current frame data is output to the liquid crystal display device so that the liquid crystal display device can display based on the compensated current frame data.

[0010] Secondly, embodiments of the present invention provide a timing controller, including: an overdrive / underdrive control unit and a local dimming unit, wherein the local dimming unit is connected to the overdrive / underdrive control unit and the backlight unit respectively;

[0011] The overdrive and underdrive control unit is used to: when the current frame data is acquired, determine the compensated current frame data based on the brightness difference between the previous frame data and the current frame data and output it to the local dimming unit;

[0012] The local dimming unit is used to: output local dimming data to the backlight unit based on the compensated current frame data; the local dimming data is used to drive the backlight unit to emit light;

[0013] The overdrive / underdrive control unit is also connected to the liquid crystal display device; the overdrive / underdrive control unit is also used to: output the compensated current frame data to the liquid crystal display device so that the liquid crystal display device displays based on the compensated current frame data.

[0014] Thirdly, embodiments of the present invention provide a display device, including: a timing controller as described in the second aspect above, a backlight unit, and a liquid crystal display device, wherein the timing controller is connected to the backlight unit and the liquid crystal display device respectively.

[0015] The beneficial effects of this invention are as follows:

[0016] This invention provides a backlight driving method, timing controller, and display device. Upon acquiring current frame data, the method determines compensated current frame data based on the brightness difference between the previous and current frame data. Then, based on the compensated current frame data, it outputs local dimming data to the backlight unit. This local dimming data drives the backlight unit to emit light. Thus, the local dimming data output based on the compensated current frame data is also compensated data. In other words, the local dimming data provided to the backlight unit takes into account the brightness difference between the current and previous frame data. Therefore, even if the previous frame does not immediately disappear when the current frame is displayed, there will be no ghosting, improving the ghosting effect in the backlight unit and enhancing its luminous efficiency, thereby improving the display effect of the display device. Furthermore, the backlight driving method also includes outputting the compensated current frame data to a liquid crystal display device (LCD) so that the LCD displays based on the compensated current frame data. Therefore, when the LCD displays based on the compensated data, it can effectively improve the ghosting effect. Combined with the fact that the backlight unit can also improve the ghosting effect, the display effect of the display device can be further enhanced. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the structure of a display device provided in an embodiment of the present invention;

[0018] Figure 2 is a schematic diagram of a timing controller provided in an embodiment of the present invention;

[0019] Figure 3 is a schematic diagram of another timing controller provided in an embodiment of the present invention;

[0020] Figure 4 is a schematic diagram of another timing controller provided in an embodiment of the present invention;

[0021] Figure 5 is a timing diagram provided in an embodiment of the present invention;

[0022] Figure 6 is a flowchart of a backlight driving method provided in an embodiment of the present invention. Detailed Implementation

[0023] The specific implementation methods of a backlight driving method, timing controller, and display device provided by the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] A liquid crystal display device includes: a liquid crystal display device, a backlight unit, and a timing controller. The timing controller is connected to both the backlight unit and the liquid crystal display device. The timing controller can provide display data to the liquid crystal display device and backlight driving data to the backlight unit. The backlight unit includes: a backlight controller, a driver, and multiple light-emitting units. The backlight controller is connected to both the timing controller and the driver. Each driver is connected to multiple light-emitting units. Based on the received backlight driving data, the backlight controller can output a driving signal to the driver, causing the driver to drive the light-emitting units to emit light. This allows the backlight unit to provide a backlight source to the liquid crystal display device, thereby enabling the display function of the liquid crystal display device.

[0025] In driving the backlight unit to emit light, it can be considered as driving it frame by frame, so the emitting state of the backlight unit in each frame can also be regarded as displaying a frame of image. Furthermore, there may be an overlap between the previous frame and the current frame, causing the previous frame to not disappear immediately. The visual effect appears simultaneously with the current frame, while the previous frame gradually disappears. This phenomenon is called ghosting, causing ghosting when the backlight unit emits light. Therefore, how to eliminate ghosting in the backlight unit and improve its emitting effect has become an urgent problem to be solved in this field.

[0026] Based on this, this application provides a backlight driving method, a timing controller, and a display device to eliminate the afterimage phenomenon in the backlight unit and improve the luminous effect of the backlight unit.

[0027] Specifically, this application provides a display device, as shown in FIG1. ​​The display device may include: a timing controller 100, a backlight unit 200 and a liquid crystal display device 300, wherein the timing controller 100 is connected to the backlight unit 200 and the liquid crystal display device 300 respectively.

[0028] Optionally, the display device can be any product or component with display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator.

[0029] The timing controller 100 can be structured as shown in Figure 2. The timing controller 100 may include an overdrive / underdrive control unit 120 and a local dimming unit 110. The local dimming unit 110 is connected to the overdrive / underdrive control unit 120 and the backlight unit 200, respectively. The overdrive / underdrive control unit 120 is used to: when the current frame data S0 is acquired, determine the compensated current frame data S1 based on the brightness difference between the previous frame data and the current frame data S0 and output it to the local dimming unit 110.

[0030] The local dimming unit 110 is used to: output local dimming data S2 to the backlight unit 200 according to the compensated current frame data S1; the local dimming data S2 is used to drive the backlight unit 200 to emit light.

[0031] The compensated current frame data S1 can be understood as data determined by overdrive and low-drive techniques based on the brightness difference between the current frame data and the previous frame data. In other words, the supplemented current frame data is data that has been corrected and compensated based on the brightness difference between the current frame data and the previous frame data using overdrive and low-drive techniques. Therefore, the local dimming data S2 output by the local dimming unit 110 based on the compensated current frame data S1 is also compensated data. In other words, the local dimming data S2 provided to the backlight unit 200 takes into account the brightness difference between the current frame data and the previous frame data. Therefore, even if the previous frame does not disappear immediately when the current frame is displayed, there will be no ghosting phenomenon, which improves the ghosting phenomenon in the backlight unit 200, improves the light emission effect of the backlight unit 200, and thus improves the display effect of the display device.

[0032] Furthermore, if the light-emitting unit in the backlight unit 200 is an LED, the LED has a faster response speed when emitting light. In addition, the LED is driven to emit light using the compensated current frame data S1, which can effectively improve the afterimage phenomenon in the backlight unit 200.

[0033] Because the response speed of the liquid crystal display device 300 is relatively slow, the previous frame image may overlap with the current frame image, resulting in ghosting. In this case, as shown in Figure 3, the overdrive / underdrive control unit 120 can also be connected to the liquid crystal display device 300. The overdrive / underdrive control unit 120 is also used to output the compensated current frame data S1 to the liquid crystal display device 300, so that the liquid crystal display device 300 displays based on the compensated current frame data S1.

[0034] Therefore, the display data output to the liquid crystal display device 300 is also the data after the current frame data S0 is compensated by overdrive technology and low drive technology. So when the liquid crystal display device 300 displays based on the compensated data, it can effectively improve the afterimage phenomenon. When combined with the backlight unit 200, which can also improve the afterimage phenomenon, the display effect of the display device can be further improved.

[0035] In the timing controller 100, an overdrive / low-drive control unit 120 can be provided, as shown in Figure 3. The same output terminal m1 of this overdrive / low-drive control unit 120 is connected to both the local dimming unit 110 and the liquid crystal display device 300, allowing the overdrive / low-drive control unit 120 to provide compensated current frame data S1 to both the local dimming unit 110 and the liquid crystal display device 300. This not only reduces the number of overdrive / low-drive control units 120, lowering manufacturing costs, but also allows for the reuse of existing overdrive / low-drive control units 120 within the timing controller 100, eliminating the need for hardware modifications to the existing timing controller 100 and achieving the elimination of image retention in the backlight unit 200 within the existing hardware architecture.

[0036] Alternatively, the timing controller 100 can be equipped with two overdrive / underdrive control units 120 (not shown in the figure). In this case, one overdrive / underdrive control unit 120 can be connected to the local dimming unit 110, and the other overdrive / underdrive control unit 120 can be connected to the liquid crystal display device 300. Thus, different overdrive / underdrive control units 120 can provide compensated current frame data S1 to the local dimming unit 110 and the liquid crystal display device 300 respectively. This prevents the liquid crystal display device 300 and the local dimming unit 110 from failing to receive the compensated current frame data S1 if one of the overdrive / underdrive control units 120 malfunctions, thereby preventing the display device from failing to display normally and improving the reliability of the display device.

[0037] Optionally, as shown in FIG4, the overdrive / underdrive control unit 120 may include: an encoder / decoder 1201, a finder 1202, a gating controller 1203, and a memory controller 1204.

[0038] The encoder / decoder 1201 is connected to the finder 1202 and the memory controller 1204 respectively. The finder 1202 is also connected to the gating controller 1203. The gating controller 1203 is also connected to the local dimming unit 110. The memory controller 1204 is connected to the memory 130.

[0039] The memory controller 1204 is used to: store the received current frame encoded data into the memory 130, retrieve the previous frame encoded data from the memory 130 and send it to the encoder / decoder 1201;

[0040] The encoder / decoder 1201 is used to: send the acquired current frame data S0 and the previous frame data S0' corresponding to the previous frame encoded data to the lookup unit 1202; and send the current frame encoded data corresponding to the current frame data S0 to the memory controller 1204;

[0041] The lookup unit 1202 is configured to: in response to determining that there is a brightness difference between the current frame data S0 and the previous frame data S0', look up the compensated current frame data S1 corresponding to the brightness difference from the stored lookup table and output it; in response to determining that there is no difference between the current frame data S0 and the previous frame data S0', output the current frame data S0.

[0042] The gating controller 1203 is used to: output the compensated current frame data S1 in response to receiving the compensated current frame data S1; and output the current frame data S0 in response to not receiving the compensated current frame data S1.

[0043] The memory 130 can be located outside the overdrive / underdrive control unit 120 and inside the timing controller 100; or the memory 130 can be located outside the timing controller 100. The specific design can be made according to actual needs and is not limited here.

[0044] Of course, the structure of the overdrive / underdrive control unit 120 is not limited to that shown in Figure 4. It can also be other structures known to those skilled in the art that can realize the function of the overdrive / underdrive control unit 120. The specific configuration can be made according to actual needs.

[0045] It should be understood that the overdrive and underdrive control unit employs overdrive and underdrive technologies to compensate for the current frame data. The overdrive technology can be understood as follows:

[0046] For liquid crystal display devices, the liquid crystal molecules have viscous properties. Therefore, it takes a certain amount of time for the liquid crystal molecules to deflect to the desired posture under voltage drive. If this time is too long, it will cause image retention in the liquid crystal display device. In order to reduce the time required for the liquid crystal molecules to deflect to the desired posture, the driving voltage can be increased when the brightness of the liquid crystal display device changes from low to high. This will make the liquid crystal molecules rotate faster, thereby reducing the time it takes for the liquid crystal molecules to deflect to the desired posture and reducing the probability of image retention in the liquid crystal display device. This driving technology of increasing the driving voltage can be regarded as overdrive technology.

[0047] When the light-emitting unit in the backlight unit is an LED, if the LED's performance degrades and the display brightness changes from low to high, even if the expected driving voltage is provided to the LED, the LED will not be able to display the expected brightness, resulting in a ghosting phenomenon in the backlight unit. At this time, the driving voltage can be increased to make the LED reach the expected brightness, thereby eliminating the ghosting phenomenon. This driving technology of increasing the driving voltage can also be regarded as overdrive technology.

[0048] Conversely, low-drive technology can be understood as:

[0049] For liquid crystal display devices, if the driving voltage can be reduced when the brightness of the display changes from high to low, the liquid crystal molecules can be accelerated to rotate, thereby reducing the time it takes for the liquid crystal molecules to deflect to the desired posture; this driving technology of reducing driving voltage can be regarded as low driving technology.

[0050] For backlight units, when the display brightness changes from low to high, the driving voltage can be reduced to make the LED reach the expected brightness, thereby eliminating the afterimage phenomenon. This driving technology of reducing driving voltage can also be regarded as overdrive technology.

[0051] Therefore, the overdrive and lowdrive control unit is a structure that can realize overdrive and lowdrive technologies, thereby improving the display effect of display devices.

[0052] The operation of the timing controller 100 will now be described with reference to specific embodiments and the structure shown in Figure 4. In Figure 4, S0 represents the i-th frame data, which can also be regarded as the current frame data; S1 represents the compensated i-th frame data; S0' represents the (i-1)-th frame data, which can also be regarded as the previous frame data.

[0053] The specific work process may include:

[0054] S1. Encoder-decoder 1201 receives the input i-th frame data, where i is a positive integer; after encoding the i-th frame data, encoder-decoder 1201 obtains the corresponding i-th frame encoded data and outputs the i-th frame encoded data to memory controller 1204 so that memory controller 1204 stores the i-th frame encoded data into memory.

[0055] S2, Encoder / decoder 1201 sends a request to memory controller 1204;

[0056] S3. After receiving the request, the memory controller 1204 extracts the encoded data of the (i-1)th frame from the memory and outputs it to the encoder / decoder 1201;

[0057] Wherein, when the value of i is 1, the encoded data of the (i-1)th frame can be the pre-configured encoded data; when the value of i is greater than 1, the encoded data of the (i-1)th frame can be the data encoded by the encoder-decoder 1201 and stored in the memory by the memory controller 1204, that is, the encoded data of the (i-1)th frame is the encoded data corresponding to the input of the previous frame data.

[0058] S4. After the encoder-decoder 1201 decodes the encoded data of the (i-1)th frame, it obtains the corresponding (i-1)th frame data and outputs both the i-th frame data and the (i-1)th frame data to the lookup unit 1202.

[0059] S5. Finder 1202 determines whether there is a brightness difference between the i-th frame data and the (i-1)-th frame data; if yes, proceed to S6; if no, proceed to S7.

[0060] S6. The lookup table of differences and compensation values ​​is pre-stored in the lookup unit 1202. The corresponding compensation value is found from the lookup table. This compensation value is the data of the i-th frame after compensation and is output to the gating controller 1203; S8 is executed.

[0061] S7. The lookup unit 1202 outputs the uncompensated i-th frame data (i.e., the data represented by S0) to the gating controller 1203; S8 is executed.

[0062] S8. The data received by the gating controller 1203 is either the compensated i-th frame data or the uncompensated i-th frame data. It will not receive two data at the same time. Therefore, when the gating controller 1203 receives the compensated i-th frame data, it outputs it to the liquid crystal display device 300 and the local dimming unit 110, or when it receives the uncompensated i-th frame data, it outputs it to the liquid crystal display device 300 and the local dimming unit 110.

[0063] Based on the process described in S1 to S8 above, the overdrive and underdrive control unit 120 can output the compensated i-th frame data based on the input i-th frame data, thereby realizing the correction and compensation of the i-th frame data.

[0064] S9. The liquid crystal display device 300 displays data based on the received data;

[0065] S10, the local dimming unit 110 outputs local dimming data S2 based on the received data, so that the backlight unit 200 emits light based on the local dimming data S2.

[0066] It should be noted that when there is no brightness difference between the i-th frame and the (i-1)-th frame, no ghosting will occur even if the corresponding images of the two frames are displayed simultaneously. Ghosting will only occur when there is a brightness difference between the two frames and the corresponding images are displayed simultaneously. Therefore, when there is no brightness difference between the two frames, the local dimming unit 110 can directly generate local dimming data S2 based on the i-th frame. When there is a brightness difference between the two frames, the local dimming unit 110 needs to use the compensated i-th frame to generate local dimming data S2 to eliminate ghosting.

[0067] The encoding and decoding processes mentioned in S1 to S10 above can be implemented using any method known to those skilled in the art that can achieve encoding and interface, and are not specifically limited here.

[0068] Thus, through the processes described in S1 to S10 above, the image retention phenomenon in the backlight unit 200 can be improved, and the display effect can be enhanced.

[0069] Based on this, and referring to Figure 4, it can be determined that: the output terminal of the gating controller 1203 is connected to the input terminal of the local dimming unit 110; the gating controller 1203 is also specifically used to: output the compensated current frame data S1 to the input terminal of the local dimming unit 110, so that the compensated current frame data S1 output by the gating controller 1203 can be transmitted to the local dimming unit 110, thereby realizing the compensation of the backlight unit 200 and eliminating the afterimage phenomenon in the backlight unit 200.

[0070] Optionally, the moment when the local dimming data S2 is output to the backlight unit 200 is designated as the first moment, and the moment when the compensated current frame data is output to the liquid crystal display device 300 is designated as the second moment. The time difference between the first moment and the second moment is less than the display time of one frame. The closer the first moment when the local dimming data S2 is output to the backlight unit 200 and the second moment when the compensated current frame data is output to the liquid crystal display device 300 are, the more synchronized the display of the liquid crystal display device 300 and the backlight unit 200 is, resulting in a better display effect. Therefore, by reducing the time difference between the first moment and the second moment, the synchronization of the display between the liquid crystal display device 300 and the backlight unit 200 can be increased, thereby further improving the display effect of the display device.

[0071] Furthermore, the time elapsed from the output of the compensated current frame data to the output of the local dimming data S2 is called the first duration, and the time difference between the first moment and the second moment is also called the first duration. For example, for the structure shown in Figure 4, a timing diagram of each frame data shown in Figure 5 is given. t2 represents the output time of the compensated current frame data, that is, the second moment when the compensated current frame data is output to the liquid crystal display device 300 is t2. t1 represents the output time of the corresponding local dimming data, that is, the first moment when the local dimming data S2 is output to the backlight unit 200 is t1. t1-t2 represents the duration for the local dimming unit 110 to process one frame of data, that is, t1-t2 can represent the first duration. The numbers in the blocks in Figure 5 represent the frame numbers of the data. For example, the number 1 represents the first frame of data, the number 2 represents the second frame of data, and so on.

[0072] Furthermore, when the gating controller 1203 receives the compensated current frame data, it will output the compensated current frame data. Therefore, the time elapsed from receiving the compensated current frame data to outputting the compensated current frame data can be ignored. In other words, t1 can also represent the time for outputting the compensated current frame data to the liquid crystal display device 300.

[0073] Therefore, when the processing time of the local dimming unit 110 is short, t1 and t2 can be considered to be very close, so that the time for outputting the compensated current frame data to the liquid crystal display device 300 and the backlight unit 200 is almost the same, which increases the synchronization of the display of the liquid crystal display device 300 and the backlight unit 200, thereby improving the display effect of the display device.

[0074] Furthermore, as shown in Figure 5, the time difference between the first moment t1 and the second moment t2 is no greater than 1 / 4 of the display time of one frame. Assuming that the ratio of the time difference between the first moment t1 and the second moment t2 to the display time of one frame is represented by 'a', the value of 'a' is no greater than 1 / 4. For example, but not limited to, 'a' can be 1 / 4, 1 / 5, 1 / 6, 1 / 7, or 1 / 8, or other smaller values, depending on the actual situation. Therefore, the smaller the value of 'a', the smaller the time difference between the first moment t1 and the second moment t2, which indicates higher synchronization between the liquid crystal display device and the backlight unit, resulting in better display performance. Conversely, a larger value for 'a' indicates higher synchronization between the liquid crystal display device and the backlight unit, resulting in better display performance. Therefore, setting the value of 'a' within an appropriate range can effectively control the display performance of the device to meet the needs of different application scenarios.

[0075] It should be understood that, as shown in Figure 5, the initial frame data represents the frame data generated by the timing controller 100 based on data provided externally. Taking the second frame data as an example, when the encoder / decoder 1201 receives the second frame data, it sends a request to the memory controller 1204 to read the first frame encoded data from the memory. The time taken for this process is represented by Δt1. Starting from reading the first frame encoded data, the encoder / decoder 1201 decodes the first frame encoded data provided by the memory controller 1204 after receiving it, obtaining the decoded first frame data. The time taken for this process is represented by Δt2. From obtaining the decoded first frame data to the gating controller 1203 outputting the compensated first frame data, the time taken for this process is represented by Δt3. "Write data" refers to data written to the memory 130, and "Read data" refers to data read from the memory 130.

[0076] Of course, the timing of various data is not limited to that shown in Figure 5. Other timing sequences can be designed according to actual needs. However, as long as the time difference (i.e. t1-t2) between the compensated i-th frame data and the output i-th frame local dimming data is less than the duration of one frame data, the display synchronization of the liquid crystal display device 300 and the backlight unit 200 can be improved, thereby improving the display effect of the display device.

[0077] Optionally, when the compensated current frame data can include grayscale data or RGB data, it is more conducive to realizing local dimming data as grayscale values ​​or RGB data, thereby making it easier to drive the backlight unit 200.

[0078] Based on the same inventive concept, this invention also provides a backlight driving method. The implementation principle of this backlight driving method is basically similar to that of the aforementioned timing controller. For the specific implementation of this backlight driving method, please refer to the specific embodiments in the aforementioned timing controller. Repeated details will not be repeated.

[0079] Specifically, the backlight driving method provided in this application embodiment, as shown in FIG6, may include:

[0080] S601. When the current frame data is obtained, the compensated current frame data is determined based on the brightness difference between the previous frame data and the current frame data.

[0081] S602. Based on the compensated current frame data, output local dimming data to the backlight unit; the local dimming data is used to drive the backlight unit to emit light.

[0082] Optionally, the method may further include: outputting the compensated current frame data to a liquid crystal display device so that the liquid crystal display device displays based on the compensated current frame data.

[0083] Optionally, the moment when the local dimming data is output to the backlight unit is the first moment, and the moment when the compensated current frame data is output to the liquid crystal display device is the second moment. The time difference between the first moment and the second moment is less than the display time of one frame.

[0084] Optionally, the time elapsed from determining the compensated current frame data to outputting local dimming data is defined as the first duration, and the time difference between the first moment and the second moment is defined as the first duration.

[0085] Optionally, the time difference between the first moment and the second moment shall not exceed 1 / 4 of the display time of one frame.

[0086] Optionally, the compensated current frame data includes grayscale values ​​or RGB data.

[0087] In summary, the technical solution provided in this application has the following advantages:

[0088] (1) Local dimming data can be obtained by using data after compensation by overdrive technology and low drive technology.

[0089] (2) The existing overdrive and underdrive control units in the hardware architecture can be used without adding additional hardware, which reduces the manufacturing cost and structural complexity of the display device. Furthermore, it can also realize the synchronous display of the liquid crystal display device and the backlight unit, thereby improving the display effect of the display device.

[0090] (3) By using the data after compensation by overdrive technology and underdrive technology, combined with the fast response of LEDs in the backlight unit, the image retention phenomenon of the backlight unit can be effectively improved.

[0091] (4) The compensated data can contain grayscale data or RGB data, and local dimming data is generally in the form of grayscale data or RGB data. Therefore, when generating local dimming data based on the compensated data, there is no need to modify the local dimming unit. The existing hardware and software architecture can be used.

[0092] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A backlight driving method, characterized by, The method comprises the following steps: When the current frame data is acquired, the compensated current frame data is determined according to the brightness difference between the previous frame data and the current frame data; The local dimming data is output to the backlight unit according to the compensated current frame data; The local dimming data is used to drive the backlight unit to emit light; The compensated current frame data is output to the liquid crystal display device, so that the liquid crystal display device displays based on the compensated current frame data.

2. The method of claim 1, wherein, The time when the local dimming data is output to the backlight unit is the first time, and the time when the compensated current frame data is output to the liquid crystal display device is the second time, and the time difference between the first time and the second time is less than the display time of one frame of picture.

3. The method of claim 2, wherein, The time difference between the first time and the second time is the first time length, and the time difference between the first time and the second time is the first time length.

4. The method of claim 2, wherein, The time difference between the first time and the second time is not greater than 1 / 4 of the display time of one frame of picture.

5. The method according to any one of claims 1 to 4, characterized in that, The compensated current frame data includes gray value or RGB data.

6. A timing controller, characterized by, The method comprises the following steps: The overdrive and low drive control unit and the local dimming unit are connected with the overdrive and low drive control unit and the backlight unit respectively; When the current frame data is acquired, the compensated current frame data is determined according to the brightness difference between the previous frame data and the current frame data, and is output to the local dimming unit; The local dimming unit outputs the local dimming data to the backlight unit according to the compensated current frame data; the local dimming data is used to drive the backlight unit to emit light; The overdrive and low drive control unit is also connected with the liquid crystal display device; the overdrive and low drive control unit is also used to output the compensated current frame data to the liquid crystal display device, so that the liquid crystal display device displays based on the compensated current frame data.

7. The timing controller of claim 6, wherein, The overdrive and low drive control unit comprises a codec, a lookup table, a gate controller and a memory controller; The codec is connected with the lookup table and the memory controller respectively, the lookup table is also connected with the gate controller, the gate controller is also connected with the local dimming unit, and the memory controller is connected with the memory; The memory controller is used to store the received current frame encoding data in the memory, and extract the previous frame encoding data from the memory and send it to the codec; The codec is used to send the acquired current frame data and the previous frame data corresponding to the previous frame data to the lookup table, and send the current frame data corresponding to the current frame encoding data to the memory controller; The lookup table is used to find the compensated current frame data corresponding to the brightness difference from the stored lookup table in response to determining that there is a brightness difference between the current frame data and the previous frame data, and output the current frame data in response to determining that there is no difference between the current frame data and the previous frame data. The gate controller is configured to: output the compensated current frame data in response to receiving the compensated current frame data; and output the current frame data in response to not receiving the compensated current frame data.

8. The timing controller of claim 7, wherein, An output terminal of the gate controller is connected to an input terminal of the local dimming unit. The gate controller is further configured to output the compensated current frame data to the input terminal of the local dimming unit.

9. A display device, characterized by comprising: Comprising: The timing controller, the backlight unit and the liquid crystal display device according to any one of claims 6-8, wherein the timing controller is connected to the backlight unit and the liquid crystal display device, respectively.

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