Driving method for display apparatus and display apparatus

Abstract

Disclosed in the present application are a driving method for a display apparatus, and a display apparatus. The display apparatus comprises a display panel and a backlight module, the backlight module comprising a lamp panel, a plurality of LED lamps and a control module for controlling the number of lit LED lamps. The driving method comprises the steps: acquiring grayscale values in the next frame for all pixels in the display panel corresponding to a current partition, and generating a driving current signal and a control signal; according to the control signal, controlling to turn on the corresponding LED lamps; and the driving current signal and the control signal jointly controlling grayscale display for pixels of the display panel corresponding to the partition.

Description

Display device driving method and display device Technical Field

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

[0002] Currently, more and more display products are using Mini-LED as the backlight display. Mini-LED adopts a direct-type, small-pitch lamp bead design, and achieves regional dimming in a smaller range through a large number of densely distributed lamps. Compared with traditional backlight design, it can have better brightness uniformity and higher color contrast within a smaller mixing distance, which can realize ultra-thin design of terminal products and save energy.

[0003] Existing Mini-LED backlight control technology uses the traditional one-to-one control method, that is, each controlled light zone corresponds to a control channel of a constant current driver chip. When the number of zones reaches more than 1,000, the number of constant current control chips will increase sharply, which will consume a large number of chips. Mini LED technology can be understood as a comprehensive upgrade version of LCD. By dynamically controlling the brightness of the zone backlight, dark areas are made darker, greatly improving the contrast. However, the brightness transition uniformity of some intermediate grayscales is relatively poor, and a smooth transition cannot be achieved.

[0004] Summary of the Invention

[0005] The purpose of the present application is to provide a driving method for a display device and a display device, which improves the brightness uniformity of the intermediate grayscale by partitioning the partitions and controlling the number of bright and dark LEDs in the partitions to achieve a smooth transition.

[0006] The present application discloses a method for driving a display device, wherein the display device includes a display panel and a backlight module for providing backlight for the display panel. The backlight module includes a light board and a plurality of LED lights arranged on the light board. The plurality of LED lights are divided into a plurality of partitions, each of which is provided with at least four LED lights connected in series, and a control module for controlling the number of LED lights to be lit. The driving method includes the following steps:

[0007] Obtaining the grayscale values ​​of the next frame of all pixels in the display panel corresponding to the current partition, and generating a driving current signal and a control signal; and

[0008] The control module controls the lighting of the corresponding LED light according to the control signal;

[0009] The driving current signal and the control signal jointly control the grayscale display of the pixels of the display panel corresponding to the partition.

[0010] The present application also discloses a display device, which is driven using any of the above-described driving methods. The display device includes a grayscale signal generating module and a driving current generating module, wherein the grayscale signal generating module is connected to the driving current generating module, and the control module is connected to the grayscale signal generating module. The driving current module generates a driving current signal according to the grayscale value of the grayscale signal generating module and outputs it to an LED lamp. The control module generates a control signal according to the grayscale value of the grayscale signal generating module to control the number of LED lamps that are turned on. The display device is driven using the following driving method, which includes the following steps:

[0011] Obtaining the grayscale values ​​of the next frame of all pixels in the display panel corresponding to the current partition, and generating a driving current signal and a control signal; and

[0012] The control module controls the lighting of the corresponding LED light according to the control signal;

[0013] The driving current signal and the control signal jointly control the grayscale display of the pixels of the display panel corresponding to the partition.

[0014] The present application also discloses a display device, which includes a grayscale signal generating module and a driving current generating module. The grayscale signal generating module is connected to the driving current generating module, and the control module is connected to the grayscale signal generating module. The driving current module generates a driving current signal according to the grayscale value of the grayscale signal generating module and outputs it to the LED lamp. The control module generates a control signal according to the grayscale value of the grayscale signal generating module to control the number of LED lamps that are turned on. The display device is driven using the following driving method, which includes the following steps:

[0015] Calculating and comparing the grayscale values ​​of all pixels to obtain a maximum grayscale value, and generating a driving current signal and a control signal according to the calculated maximum grayscale value; and

[0016] The control module controls the lighting of the corresponding LED light according to the control signal;

[0017] The driving current signal and the control signal jointly control the grayscale display of the pixels of the display panel corresponding to the partition.

[0018] Compared with the conventional backlight solution that is bright or dimmed at the same time, this application sets up a control module for multiple LED lights in a partition to achieve the goal of some LED lights in a zone being bright and some LED lights being dimmed. The number of bright and dark lights can be selected. Different numbers of bright LED lights can achieve different grayscale displays, making the display brightness more uniform in the middle grayscale transition, avoiding poor display uniformity and inability to transition smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

[0020] FIG1 is a schematic flow chart of a driving method according to the first embodiment of the present application;

[0021] FIG2 is a schematic structural diagram of a display device according to a first embodiment of the present application;

[0022] FIG3 is a schematic diagram of a partition structure of a display device according to a first embodiment of the present application;

[0023] FIG4 is a schematic flow chart of a driving method according to a second embodiment of the present application;

[0024] FIG5 is a schematic diagram of a partition structure of a display device according to a third embodiment of the present application;

[0025] FIG6 is a schematic diagram of another partition structure of a display device according to the third embodiment of the present application;

[0026] FIG7 is a schematic flow chart of a driving method according to a third embodiment of the present application;

[0027] FIG8 is a schematic structural diagram of a display device according to a fourth embodiment of the present application;

[0028] FIG9 is a schematic flow chart of a driving method according to a fourth embodiment of the present application;

[0029] FIG10 is a schematic diagram of a display device according to a fifth embodiment of the present application;

[0030] FIG11 is a schematic diagram of a display device according to a sixth embodiment of the present application;

[0031] FIG12 is a schematic diagram of a display device according to a seventh embodiment of the present application;

[0032] FIG13 is a schematic diagram of a display device according to an eighth embodiment of the present application.

[0033] Among them, 100, display device; 110, display panel; 111, pixel; 120, backlight module; 130, partition; 140, control module; 141, control signal generating unit; 150, brightness detection module; 160, timing module; 170, compensation signal module; 180, grayscale signal generating module; 190, driving current generating module; 200, first calculation module; 210, second calculation module; Q1-first active switch; Q2-second active switch; Q3-third active switch; Q4-fourth active switch; Q5-fifth active switch; Q6-sixth active switch; LED1-first LED lamp; LED2-second LED lamp; LED3-third LED lamp; LED4-fourth LED lamp; LED5-fifth LED lamp; LED6-sixth LED lamp; LED7-seventh LED lamp; LED8-eighth LED lamp; LED9-ninth LED lamp. DETAILED DESCRIPTION

[0034] It should be understood that the terms used herein, the specific structures and functional details disclosed are only for describing specific embodiments and are representative. However, the present application can be implemented in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0035] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate relative importance or implicitly specify the quantity of the technical features indicated. Therefore, unless otherwise specified, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features; "plurality" means two or more. The term "comprising" and any variations thereof are intended to be non-exclusive inclusion, and one or more other features, integers, steps, operations, units, components, and / or combinations thereof may be present or added.

[0036] In addition, terms indicating orientation or positional relationships such as “center,” “lateral,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inside,” and “outside” are described based on the orientation or relative positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present application, and do not indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0037] Furthermore, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0038] The present application is described in detail below with reference to the accompanying drawings and optional embodiments.

[0039] As shown in FIG1 , as a first embodiment of the present application, a driving method of a display device 100 is disclosed. The display device 100 mainly adopts mini-LED, but this does not mean that the solution of the present application can only be used for mini-LED. It can also be used for a display device 100 that adopts LED or micro-LED as backlight. Referring to FIG1 to FIG3 , the display device 100 includes a display panel 110 and a backlight module 120 that provides backlight for the display panel 110. The backlight module 120 includes a light board and a plurality of LED lamps arranged on the light board. The plurality of LED lamps are divided into a plurality of partitions 130. Each of the partitions 130 is provided with at least four LED lamps connected in series, and a control module 140 that controls the number of lit LED lamps. The driving method includes the following steps:

[0040] S1: Obtaining the grayscale values ​​of the next frame of all pixels 111 in the display panel 110 corresponding to the current partition 130, and generating a driving current signal and a control signal; and

[0041] S2: The control module 140 controls the corresponding LED light to light up according to the control signal;

[0042] The driving current signal and the control signal jointly control the grayscale display of the pixels 111 of the display panel 110 corresponding to the partition 130 .

[0043] This embodiment breaks the limitation that the LEDs in the partition 130 can only be fully dark or fully bright. The multiple LED lights in the partition 130 are divided into partitions 130. The partition 130 is provided with at least four LED lights connected in series, and a control module 140 controls the number of lit LED lights. By setting a control module 140, some LED lights in a zone can be lit and some LED lights can be dark. The number of bright and dark lights can be selected. Different numbers of lit LED lights can realize different grayscale displays, so that the display brightness is more uniform in the transition between the middle grayscales, avoiding poor display uniformity and the inability to transition smoothly.

[0044] Referring to Figures 2 and 3, taking four LED lamps as an example, the control module 140 includes control signal input terminals corresponding to two active switches. The four LED lamps are the first LED lamp D1, the second LED lamp D2, the third LED lamp D3, and the fourth LED lamp D4. The two active switches are the first active switch Q1 and the second active switch Q2. After obtaining the grayscale value of the pixel 111 corresponding to the backlight, a driving current signal and a control signal are generated. If only one LED lamp needs to be lit, the control module 140 generates a control signal to control the first active switch Q1 and the second active switch Q2 to be turned on. The driving current signal is directly input from the first LED lamp D1 and output through the first active switch Q1 and the second active switch Q2. The remaining three LED lamps are short-circuited and will not be lit. If two LED lamps need to be lit, , the first active switch Q1 is controlled to be turned on, and the first LED lamp D1 and the fourth LED lamp D4 are lit, and the rest are not lit; if three LED lamps need to be lit, the second active switch Q2 is controlled to be turned on, the first LED lamp D1, the second LED lamp D2 and the third LED lamp D3 are lit, and the rest are not lit; if four LED lamps need to be lit, the first active switch Q1 and the second active switch Q2 are controlled to be turned off, and the first LED lamp D1, the second LED lamp D2, the third LED lamp D3 and the fourth LED lamp D4 are all lit. Controlling the conduction or closing of the active switches can make different LEDs light up, thereby achieving a smooth transition of grayscale changes, and no longer directly turning four LED lamps off as before, resulting in large differences in brightness changes and poor display effects.

[0045] Furthermore, step S1 includes:

[0046] S11 : summing the grayscale values ​​of all pixels 111 and calculating an average value, and generating a driving current signal and a control signal according to the calculated average grayscale value.

[0047] In order to make the grayscale display of the pixels 111 corresponding to the partition 130 more uniform, and at the same time avoid excessive power consumption of the LED and large brightness differences in the grayscale display of the pixels 111, the grayscales of the pixels 111 corresponding to the partition 130 are summed to calculate the average value, and a driving current signal and a control signal are generated according to the average grayscale value. The driving current signal is output to the LED, and the brightness of the corresponding LED is controlled by the control signal. In addition, in addition to generating the driving current signal and the control signal according to the average grayscale value, the driving current signal and the control signal can also be generated according to the median grayscale value or the maximum grayscale value among the grayscale values ​​of all pixels 111.

[0048] As shown in FIG4 , as a second embodiment of the present application, with reference to FIG2 and FIG4 , the display device 100 further includes a brightness detection module 150. When the next frame is displayed as the current frame, the brightness detection module 150 detects the brightness value of the grayscale display of the current frame. If the brightness value detected by the brightness detection module 150 is less than a preset value, the following steps are performed:

[0049] S11 ′: calculating and comparing the grayscale values ​​of all pixels 111 to obtain a maximum grayscale value, and generating a driving current signal and a control signal according to the calculated maximum grayscale value.

[0050] Considering that if the average grayscale value of pixel 111 is used to generate the corresponding driving current signal and control signal, the final display brightness of some pixels 111 may not meet the requirements, and the actual brightness may be darker than the target brightness. At this time, compensation can be performed in other ways, such as increasing the data line voltage corresponding to pixel 111, etc., but the brightness of increasing the data line voltage is limited. Affected by the line resistance of the data line, there is still loss, resulting in insufficient compensation. This embodiment mainly compensates from the backlight. When the actual brightness value detected by the brightness detection module 150 is less than the preset value, that is, the target value, then the next time it is displayed, the average grayscale value will no longer be used to generate the driving current signal and the control signal. Instead, the driving current signal and the control signal will be generated by the maximum grayscale value, thereby increasing the brightness of the LED to improve the display brightness of pixel 111.

[0051] As shown in Figures 5 to 7, as the third embodiment of the present application, which is a further refinement of the above embodiment, the partition 130 includes nine LED lamps connected in series, namely the first LED lamp D1, the second LED lamp D2... and the ninth LED lamp D9. The control module 140 includes six active switches, namely the first active switch Q1, the second active switch Q2... and the sixth active switch Q6. There are six corresponding control signals, and the six control signals are respectively input to the control ends of the six active switches. The input end of the first active switch Q1 is connected between the first LED lamp D1 and the second LED lamp D2, and the output end is connected between the fifth LED lamp D5 and the sixth LED lamp D6. The input end of the second active switch Q2 is connected between the second LED lamp D2 and the third LED lamp D3. , the output end is connected between the fourth LED lamp D4 and the fifth LED lamp D5, the input end of the third active switch Q3 is connected between the fifth LED lamp D5 and the sixth LED lamp D6, and the output end is connected between the seventh LED lamp D7 and the eighth LED lamp D8, the input end of the fourth active switch Q4 is connected between the fourth LED lamp D4 and the fifth LED lamp D5, and the output end is connected between the eighth LED lamp D8 and the ninth LED lamp D9, the input end of the fifth active switch Q5 is connected between the seventh LED lamp D7 and the eighth LED lamp D8, and the output end is connected to the output end of the ninth LED lamp D9, the input end of the sixth active switch Q6 is connected between the eighth LED lamp D8 and the ninth LED lamp D9, and the output end is connected to the output end of the ninth LED lamp D9; the step S2 includes:

[0052] S21: Input six control signals (S1, S2, S3, S4, S5, S6) to the control ends of the six active switches to control the conduction or shutdown of the corresponding active switches to light up the corresponding LED lights, so as to achieve different grayscale displays in the same partition 130.

[0053] This embodiment mainly uses nine LEDs as an example for illustration. The nine LEDs are connected in series to provide the backlight brightness of partition 130. Six active switches are added on the basis of the nine LEDs to control the backlight brightness of partition 130. It can be seen from the table below that controlling different active switches to turn on or off can obtain corresponding grayscale display.

[0054] Table 1

[0055] According to Figure 5, Table 1 above can be obtained. By controlling the corresponding active switch Q to turn on or off, the actual number of LED lights that are lit is obtained, thereby obtaining the corresponding grayscale value display. The more LED lights that are lit, the larger the grayscale value. It is not limited to being lit or turned off at the same time, and a uniform transition from 0-255 grayscales is achieved, making the grayscale brightness display of the pixel 111 more uniform and delicate, thereby improving the display effect of the entire display panel 110.

[0056] Furthermore, it can be seen from the above table that when the number of LEDs that are lit is within the range of 2-7, a variety of different conduction modes can be used to achieve this, and when different active switches are turned on, the number of corresponding LEDs that are lit does not change, but the positions of the LEDs that are actually lit may be different. That is, after different active switches are turned on, in the first conduction mode, LED1 and LED2 may be lit, and the others may not be lit; in the second conduction mode, LED1 and LED8 may be lit, and the others may not be lit. The number of LEDs that are lit in the two conduction modes is the same, but the LEDs that are actually lit are different. In this case, one of the conduction modes may generally be used for conduction. However, in the case of long-term use, some LEDs may be used for a much longer time than other LEDs. As shown in FIG6 , a timing module 160 is provided in the display device 100. The timing module 160 times the lighting time of each LED respectively. Step S21 includes:

[0057] S211: When the grayscale display values ​​of the current frame and the next frame of the same partition 130 are the same, if the number of LED lights that need to be lit is 2; if the lighting time of all LED lights is the same, then in the current frame, the second active switch Q2, the fourth active switch Q4 and the sixth active switch Q6 are controlled to be turned on, and the other active switches are turned off, so that the first LED light D1 and the second LED light D2 are lit; in the next frame, the first active switch Q1, the third active switch Q3 and the sixth active switch Q6 are controlled to be turned on, and the other active switches are turned off, so that the first LED light D1 and the eighth LED light D8 are lit.

[0058] When LED lamps are used for a long time, they may be prone to aging or increase the probability of burning out. Therefore, the lighting time of each LED lamp can be detected first. When two LED lamps are needed for display, if LED1 and LED2 are always used, the usage time of LED1 and LED2 will increase. Considering that two LEDs in partition 130 can also be displayed by changing the closing and conduction of other active switches, such as LED1 and LED8, then once it is found that the lighting time of LED2 is much greater than the lighting time of LED8, the second conduction mode can be started, that is, LED1 and LED8 are turned on, thereby reducing the lighting time of LED2 and ensuring the service life of LED2.

[0059] In addition, considering that LED1 is a long-term lighting lamp with a lighting time much longer than that of other LED lamps, a spare LED1' can be set separately for LED1. When the lighting time of LED1 exceeds a certain range, the spare LED1' can be used, that is, LED1 and LED1' are used alternately, thereby increasing the service life of LED1.

[0060] As shown in Figures 8 and 9, as a fourth embodiment of the present application, which is a further improvement of the third embodiment described above, with reference to Figures 2, 8 and 9, the display device 100 further includes a brightness detection module 150. When the next frame is displayed as the current frame, the brightness detection module 150 detects the brightness value of the grayscale display of the current frame; the display device 100 includes a compensation signal module 170. The compensation signal module 170 outputs corresponding compensation signals to the control terminals of the six active switches respectively. If the brightness value detected by the brightness detection module 150 is less than a preset value, the following steps are performed:

[0061] S3: Outputting a compensation signal to the control terminal of the corresponding active switch to control the corresponding active switch to be turned on to increase the number of lighted LEDs.

[0062] The difference between this embodiment and the above embodiment is that a compensation signal module 170 is added. The compensation signal module 170 can turn on the active switch that does not need to be turned on, so that the number of turned-on LED lights exceeds the number of LED lights that originally need to be turned on. By increasing the number of lit LEDs, the brightness of the partition 130 is improved, thereby avoiding insufficient brightness of the grayscale display of the pixel 111.

[0063] As shown in Figure 10, as the fifth embodiment of the present application, a display device 100 is disclosed, which is driven using the driving method described in any of the above embodiments. The display device 100 includes a grayscale signal generating module 180 and a driving current generating module 190. The grayscale signal generating module 180 is connected to the driving current generating module 190, and the control module 140 is connected to the grayscale signal generating module 180. The driving current module generates a driving current signal according to the grayscale value of the grayscale signal generating module 180 and outputs it to the LED lamp. The control module 140 generates a control signal according to the grayscale value of the grayscale signal generating module 180 to control the number of LED lamps that are lit.

[0064] The driving current generating module 190 is connected to the LED lamps in series and inputs the current corresponding to the grayscale to the LEDs, and the control module 140 generates the corresponding control signal according to the grayscale value to control the lighting or shutting down of the LED lamps. The grayscale or brightness adjustment of the partition 130 is realized by the driving current signal and the control signal. The driving current signal and the control signal jointly control the number of LEDs in the corresponding partition 130 that are lit, so as to realize the different grayscale display of the pixels 111 of the control display panel 110, improve the brightness uniformity of the intermediate grayscale, and achieve a smooth transition.

[0065] As shown in Figure 11, as the sixth embodiment of the present application, it is a further limitation of the above-mentioned fifth embodiment. Referring to Figures 2 and 11, the display device 100 also includes a brightness detection module 150, which detects the brightness value of the grayscale display of the current frame; the brightness detection module 150 is connected to the grayscale signal generation module 180; the display device 100 includes a first calculation module 200 and a second calculation module 210 respectively connected to the brightness detection module 150, the first calculation module 200 obtains and calculates the average grayscale value of the grayscale values ​​of all pixels 111 from the grayscale signal generation module 180, and the second calculation module 210 obtains and calculates the grayscale value difference of all pixels 111 from the grayscale signal generation module 180, and obtains the maximum grayscale value; the driving current module generates a corresponding driving current signal according to the average grayscale value or the maximum grayscale value, and the control module 140 generates a control signal according to the average grayscale value or the maximum grayscale value to control the number of LED lights that are lit.

[0066] The two calculation modules calculate the average grayscale value and the maximum grayscale value respectively. Generally, the corresponding driving current signal and control signal are generated by the average grayscale value. However, if the driving current signal and control signal generated by the average value are used, the grayscale display brightness of pixel 111 will be low. In this case, the average grayscale value is not required to generate the corresponding driving current signal and control signal, but the maximum grayscale value can be used to generate the current driving signal and control signal. Different grayscale values ​​result in different sizes of driving current signals, so that the brightness of each LED is different, and the control signal only needs to control the number of corresponding LED lights that are lit. Therefore, the control signal can continue to use the original control signal, thereby avoiding the need to regenerate the control signal and reducing the response time of LED lighting.

[0067] As shown in FIG12 , as the seventh embodiment of the present application, which further refines and defines the above embodiment, the partition 130 includes nine LED lamps connected in series, namely a first LED lamp D1, a second LED lamp D2, ..., and a ninth LED lamp D9. The nine LED lamps are arranged in three rows and three columns. When all nine LED lamps are lit, the driving current signal is input from the first LED lamp D1 to the second LED lamp D2, the third LED lamp D3, ..., and the ninth LED lamp D9 in sequence.

[0068] The control module 140 includes six active switches, namely a first active switch Q1, a second active switch Q2, ..., and a sixth active switch Q6. There are six corresponding control signals, and the six control signals are respectively input to the control ends of the six active switches. The input end of the first active switch Q1 is connected between the first LED lamp D1 and the second LED lamp D2, and the output end is connected between the fifth LED lamp D5 and the sixth LED lamp D6. The input end of the second active switch Q2 is connected between the second LED lamp D2 and the third LED lamp D3, and the output end is connected between the fourth LED lamp D4 and the fifth LED lamp D5. The input end of the third active switch Q3 is connected between the first LED lamp D1 and the second LED lamp D2, and the output end is connected between the fifth LED lamp D5 and the sixth LED lamp D6. The input end of the fourth active switch Q4 is connected between the fourth LED lamp D4 and the fifth LED lamp D5, and the output end is connected between the eighth LED lamp D8 and the ninth LED lamp D9. The input end of the fifth active switch Q5 is connected between the seventh LED lamp D7 and the eighth LED lamp D8, and the output end is connected to the output end of the ninth LED lamp D9. The input end of the sixth active switch Q6 is connected between the eighth LED lamp D8 and the ninth LED lamp D9, and the output end is connected to the output end of the ninth LED lamp D9.

[0069] The control module 140 also includes six control signal generating units 141, which respectively generate corresponding control signals (S1, S2, S3, S4, S5, S6) and output them to the control ends of six active switches to control the conduction or shutdown of the corresponding active switches to light up the corresponding LED lights, so as to achieve different grayscale displays in the same partition 130.

[0070] As shown in Figure 13, as the eighth embodiment of the present application, it is a further refinement and limitation of the above embodiment. The display device 100 includes a compensation signal module 170, and the compensation signal module 170 is connected to the brightness detection module 150. When the brightness detected by the brightness detection module 150 is less than a preset value, a compensation signal is generated and output to the compensation signal module 170; the compensation signal module 170 is respectively connected to the control ends of six active switches, and the compensation signal module 170 controls the corresponding active switch to be turned on according to whether the corresponding LED light is on and the compensation signal.

[0071] It should be noted that the limitations on the steps involved in this solution do not limit the order of the steps without affecting the implementation of the specific solution. The steps written in front can be executed first, later, or even simultaneously. As long as this solution can be implemented, it should be deemed to fall within the scope of protection of this application.

[0072] It should be noted that the inventive concept of this application can form a large number of embodiments, but the length of the application document is limited and it is impossible to list them one by one. Therefore, under the premise of no conflict, the various embodiments or technical features described above can be arbitrarily combined to form new embodiments. After the various embodiments or technical features are combined, the original technical effects will be enhanced.

[0073] The above content is a further detailed description of the present application in conjunction with specific optional implementation methods, and the specific implementation of the present application cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, they can make several simple deductions or substitutions without departing from the concept of the present application, which should be considered to fall within the scope of protection of the present application.

Claims

1. A method for driving a display device, the display device comprising a display panel and a backlight module for providing backlight for the display panel, the backlight module comprising a lamp board and a plurality of LED lamps arranged on the lamp board, the plurality of LED lamps being divided into a plurality of partitions, each of the partitions being provided with at least four LED lamps connected in series, and a control module for controlling the number of LED lamps to be lit, the driving method comprising the steps of: Obtaining the grayscale values ​​of the next frame of all pixels in the display panel corresponding to the current partition, and generating a driving current signal and a control signal; and The control module controls the corresponding LED light to light up according to the control signal; in, The driving current signal and the control signal jointly control the grayscale display of the pixels of the display panel corresponding to the partition.

2. The driving method according to claim 1, wherein: The step of obtaining the grayscale values ​​of the next frame of all pixels in the display panel corresponding to the current partition and generating a driving current signal and a control signal comprises: The grayscale values ​​of all pixels are summed up and the average value is calculated, and the driving current signal and the control signal are generated according to the calculated average grayscale value.

3. The driving method according to claim 2, wherein: The display device further includes a brightness detection module. When the next frame is displayed as the current frame, the brightness detection module detects the brightness value of the grayscale display of the current frame. If the brightness value detected by the brightness detection module is less than a preset value, the following steps are performed: The grayscale values ​​of all pixels are calculated and compared to obtain a maximum grayscale value, and a driving current signal and a control signal are generated according to the calculated maximum grayscale value.

4. The driving method according to claim 1, wherein: The partition includes nine LED lamps connected in series in sequence, namely, a first LED lamp, a second LED lamp ... and a ninth LED lamp, the control module includes six active switches, namely, a first active switch, a second active switch ... and a sixth active switch, the control signals correspond to six, and the six control signals are respectively input to the control ends of the six active switches, the input end of the first active switch is connected between the first LED lamp and the second LED lamp, and the output end is connected between the fifth LED lamp and the sixth LED lamp, the input end of the second active switch is connected between the second LED lamp and the third LED lamp, and the output end is connected between the fourth LED lamp and the fifth LED lamp, the input end of the third active switch is connected between the fifth LED lamp and the sixth LED lamp, and the output end is connected between the seventh LED lamp and the eighth LED lamp, the input end of the fourth active switch is connected between the fourth LED lamp and the fifth LED lamp, and the output end is connected between the eighth LED lamp and the ninth LED lamp, the input end of the fifth active switch is connected between the seventh LED lamp and the eighth LED lamp, and the output end is connected to the output end of the ninth LED lamp, the input end of the sixth active switch is connected between the eighth LED lamp and the ninth LED lamp, and the output end is connected to the output end of the ninth LED lamp; The step of controlling the control module to light up the corresponding LED lamp according to the control signal comprises: Six control signals are respectively input to the control ends of the six active switches to control the corresponding active switches to be turned on or off so as to light up the corresponding LED lights, so as to realize different grayscale displays in the same partition.

5. The driving method according to claim 4, wherein: The display device includes a timing module, and the timing module respectively times the lighting time of each LED. The steps of respectively inputting six control signals to the control ends of six active switches to control the turning on or off of the corresponding active switches to light up the corresponding LED lights to realize different grayscale displays in the same partition include: When the grayscale display values ​​of the current frame and the next frame of the same partition are the same, if the number of LED lights that need to be lit is 2; if the lighting time of all LED lights is the same, then in the current frame, the second active switch, the fourth active switch and the sixth active switch are controlled to be turned on, and the other active switches are turned off, so that the first LED light and the second LED light are lit; in the next frame, the first active switch, the third active switch and the sixth active switch are controlled to be turned on, and the other active switches are turned off, so that the first LED light and the eighth LED light are lit.

6. The driving method according to claim 4, wherein: The display device further includes a brightness detection module. When the next frame is displayed as the current frame, the brightness detection module detects the brightness value of the grayscale display of the current frame. The display device includes a compensation signal module. The compensation signal module outputs corresponding compensation signals to the control ends of the six active switches respectively. If the brightness value detected by the brightness detection module is less than a preset value, the following steps are performed: The compensation signal is output to the control end of the corresponding active switch to control the corresponding active switch to be turned on to increase the number of the lighted LEDs.

7. The driving method according to claim 1, wherein: The step of obtaining the grayscale values ​​of the next frame of all pixels in the display panel corresponding to the current partition and generating a driving current signal and a control signal comprises: The grayscale values ​​of all pixels are arranged in order, a median grayscale value is obtained, and a driving current signal and a control signal are generated according to the median grayscale value.

8. The driving method according to claim 1, wherein: The step of obtaining the grayscale values ​​of the next frame of all pixels in the display panel corresponding to the current partition and generating a driving current signal and a control signal comprises: The grayscale values ​​of all pixels are arranged in order, the maximum grayscale value is obtained, and the driving current signal and the control signal are generated according to the maximum grayscale value.

9. The driving method according to claim 8, wherein: The steps of arranging the grayscale values ​​of all pixels in order, obtaining the maximum grayscale value, and generating the driving current signal and the control signal according to the maximum grayscale value include: Detect the actual brightness value and increase the data voltage corresponding to the pixel.

10. The driving method according to claim 1, wherein: The partition includes four LED lamps connected in series in sequence, the control module includes two active switches and corresponding control signal input terminals, the four LED lamps are a first LED lamp, a second LED lamp, a third LED lamp and a fourth LED lamp, the two active switches are a first active switch and a second active switch, and the control module controls the corresponding LED lamps to be lit according to the control signal, comprising: After the grayscale value of the pixel corresponding to the backlight is obtained, a driving current signal and a control signal are generated. If only one LED lamp needs to be lit, the control module generates a control signal to control the first active switch and the second active switch to be turned on. The driving current signal is directly input from the first LED lamp and output through the first active switch and the second active switch. The other three LED lamps are short-circuited and will not be lit. If two LED lamps need to be lit, the first active switch is controlled to be turned on, and the first LED lamp and the fourth LED lamp are lit, while the others are not lit. If three LED lamps need to be lit, the second active switch is controlled to be turned on, and the first LED lamp, the second LED lamp and the third LED lamp are lit, while the others are not lit. If four LED lamps need to be lit, the first active switch and the second active switch are controlled to be turned off, and the first LED lamp, the second LED lamp, the third LED lamp and the fourth LED lamp are all lit.

11. The driving method according to claim 4, wherein: A spare LED lamp is also provided for each partition. The steps of inputting six control signals to the control ends of the six active switches to control the corresponding active switches to be turned on or off so as to light up the corresponding LED lamps to realize different grayscale displays in the same partition include: The backup LED lamp is controlled to be used alternately with the first LED lamp.

12. A display device, comprising a grayscale signal generating module and a driving current generating module, wherein the grayscale signal generating module is connected to the driving current generating module, the control module is connected to the grayscale signal generating module, the driving current module generates a driving current signal according to the grayscale value of the grayscale signal generating module and outputs it to an LED lamp, and the control module generates a control signal according to the grayscale value of the grayscale signal generating module to control the number of LED lamps that are lit; the display device is driven using the following driving method, the driving method comprising the steps of: Obtaining the grayscale values ​​of the next frame of all pixels in the display panel corresponding to the current partition, and generating a driving current signal and a control signal; and The control module controls the corresponding LED light to light up according to the control signal; in, The driving current signal and the control signal jointly control the grayscale display of the pixels of the display panel corresponding to the partition.

13. The display device according to claim 12, wherein: The display device further comprises a brightness detection module, which detects the brightness value of the grayscale display of the current frame; the brightness detection module is connected to the grayscale signal generation module; The display device comprises a first calculation module and a second calculation module respectively connected to the brightness detection module, the first calculation module obtains and calculates the average grayscale value of the grayscale values ​​of all pixels from the grayscale signal generation module, and the second calculation module obtains and calculates the grayscale value difference of all pixels from the grayscale signal generation module, and obtains the maximum grayscale value; The driving current module generates a corresponding driving current signal according to the average grayscale value or the maximum grayscale value, and the control module generates a control signal according to the average grayscale value or the maximum grayscale value to control the number of LED lamps that are lit.

14. The display device according to claim 12, wherein: The partition includes nine LED lamps connected in series in sequence, namely a first LED lamp, a second LED lamp, ... and a ninth LED lamp, and the nine LED lamps are arranged in three rows and three columns; The control module includes six active switches, namely, a first active switch, a second active switch, ... and a sixth active switch. There are six corresponding control signals, and the six control signals are respectively input to the control ends of the six active switches. The input end of the first active switch is connected between the first LED lamp and the second LED lamp, and the output end is connected between the fifth LED lamp and the sixth LED lamp. The input end of the second active switch is connected between the second LED lamp and the third LED lamp, and the output end is connected between the fourth LED lamp and the fifth LED lamp. The input end of the third active switch is connected between the fifth LED lamp and the sixth LED lamp, and the output end is connected between the seventh LED lamp and the eighth LED lamp. The input end of the fourth active switch is connected between the fourth LED lamp and the fifth LED lamp, and the output end is connected between the eighth LED lamp and the ninth LED lamp. The input end of the fifth active switch is connected between the seventh LED lamp and the eighth LED lamp, and the output end is connected to the output end of the ninth LED lamp. The input end of the sixth active switch is connected between the eighth LED lamp and the ninth LED lamp, and the output end is connected to the output end of the ninth LED lamp. The control module also includes six control signal generating units, which respectively generate corresponding control signals and output them to the control ends of six active switches to control the on or off of the corresponding active switches to light up the corresponding LED lights, so as to achieve different grayscale displays in the same partition.

15. The display device according to claim 14, wherein: The display device includes a compensation signal module, which is connected to the brightness detection module. When the brightness detected by the brightness detection module is less than a preset value, a compensation signal is generated and output to the compensation signal module; the compensation signal module is respectively connected to the control ends of six active switches, and the compensation signal module controls the corresponding active switch to be turned on according to whether the corresponding LED light is lit and the compensation signal.

16. The display device according to claim 12, wherein: The partition includes four LED lamps connected in series in sequence, and the control module includes two active switches and corresponding control signal input ends. The four LED lamps are a first LED lamp, a second LED lamp, a third LED lamp and a fourth LED lamp. The two active switches are a first active switch and a second active switch. The input end of the first active switch is connected between the first LED lamp and the second LED lamp, the output end is connected between the third LED lamp and the fourth LED lamp, and the control end receives a first control signal; the input end of the second active switch is connected between the third LED lamp and the fourth LED lamp, the output end is connected to the output end of the fourth LED lamp, and the control end receives a second control signal.

17. The display device according to claim 14, wherein: A spare LED lamp is also provided corresponding to each partition, and the spare LED lamp is used alternately with the first LED lamp.

18. The display device according to claim 15, wherein: The display device includes a compensation signal module, which is connected to the brightness detection module. When the brightness detected by the brightness detection module is less than a preset value, a compensation signal is generated and output to the compensation signal module; the compensation signal module is respectively connected to the control ends of two active switches, and the compensation signal module controls the corresponding active switch to be turned on according to whether the corresponding LED light is lit and the compensation signal, or controls the data line to increase the data voltage of the corresponding pixel.

19. A display device, comprising a grayscale signal generating module and a driving current generating module, wherein the grayscale signal generating module is connected to the driving current generating module, the control module is connected to the grayscale signal generating module, the driving current module generates a driving current signal according to the grayscale value of the grayscale signal generating module and outputs it to an LED lamp, and the control module generates a control signal according to the grayscale value of the grayscale signal generating module to control the number of LED lamps that are lit; the display device is driven using the following driving method, the driving method comprising the steps of: Calculating and comparing the grayscale values ​​of all pixels to obtain a maximum grayscale value, and generating a driving current signal and a control signal according to the calculated maximum grayscale value; and The control module controls the corresponding LED light to light up according to the control signal; in, The driving current signal and the control signal jointly control the grayscale display of the pixels of the display panel corresponding to the partition.

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