Display device and brightness adjusting method thereof

Abstract

The invention discloses a display device and a brightness adjusting method thereof. The display device comprises a plurality of lamp panels and a control circuit. Each lamp panel comprises a plurality of light-emitting diodes, a driving circuit and a storage circuit, and the driving circuit is used for driving the plurality of light-emitting diodes and detecting the forward voltage value of at least one light-emitting diode in the plurality of light-emitting diodes as the forward voltage value of the corresponding lamp panel. When the target lamp panel replaces one of the plurality of lamp panels, the control circuit controls the forward voltage values of the target lamp panel and the reference lamp panel to tend to be consistent. According to the display device and the brightness adjusting method thereof, the correction convenience of the display device can be improved, and the correction cost can be reduced.

Description

Technical Field

[0001] The invention relates to an electronic device, and in particular to a display device and a brightness adjustment method thereof. Background Art

[0002] Nowadays, LED displays have been widely used in application scenarios such as conferences, stages, commercial performances, advertisements and exhibitions. However, with long-term use or under different ambient temperatures, the light boards of LED displays may experience light decay and the brightness may deviate from the original factory state. Although the light decay problem can be solved by replacing new light boards, the brightness difference between the updated light boards and other old light boards often causes the display quality to deteriorate.

[0003] In the prior art, a photosensitive instrument can be used to measure the brightness value of the light board within a specific focus distance, and the brightness value of the updated light board can be adjusted according to the measurement result to solve the problem of brightness difference. However, this method may be limited by the installation environment of the LED display. For example, if the LED display is set in a position where the photosensitive instrument is not easy to measure, the calibration of the light board cannot be performed. In addition, the cost of the photosensitive instrument is relatively high, which will also increase the cost of calibration.

[0004] The "background technology" section is only used to help understand the content of the present invention. Therefore, the content disclosed in the "background technology" section may contain some known technologies that are not known to those skilled in the art. The content disclosed in the "background technology" section does not represent the content or the problems to be solved by one or more embodiments of the present invention, nor does it mean that it has been known or recognized by those skilled in the art before the application of the present invention. Summary of the invention

[0005] The present invention provides a display device and a brightness adjustment method thereof, which can improve the calibration convenience of the display device and reduce the calibration cost.

[0006] Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

[0007] In order to achieve one or part or all of the above purposes or other purposes, one embodiment of the present invention provides a display device, including multiple light boards and a control circuit. Each light board includes multiple light emitting diodes, multiple light emitting diodes, a driving circuit and a storage circuit. The driving circuit is used to drive the multiple light emitting diodes and detect the forward voltage value of at least one of the multiple light emitting diodes as the forward voltage value of the corresponding light board. The storage circuit stores the forward voltage value of the light emitting diode. The control circuit is coupled to the multiple light boards, and the multiple light boards include at least one reference light board, wherein when the target light board replaces one of the multiple light boards, the forward voltage values ​​of the target light board and the reference light board are made consistent.

[0008] The present invention also provides a method for adjusting the brightness of a display device, wherein the display device includes a plurality of light boards, each of which includes a plurality of light emitting diodes. The method for adjusting the brightness of the display device includes the following steps: Detecting the forward voltage value of at least one light emitting diode of at least one reference light board among the plurality of light boards as the forward voltage value of the reference light board. Detecting the forward voltage value of at least one light emitting diode in a target light board as the forward voltage value of the target light board. When the target light board replaces one of the plurality of light boards, the forward voltage values ​​of the target light board and the reference light board are made consistent.

[0009] Based on the above, the driving circuit of the embodiment of the present invention can detect the forward voltage value of the light emitting diode, and the control circuit can adjust the forward voltage value of the target light board according to the forward voltage value of the reference light board, so that the forward voltage value of the target light board is consistent with the forward voltage value of the reference light board, thereby correcting the brightness of the target light board and solving the problem of inconsistent brightness between the target light board and other light boards. In this way, the forward voltage value of the target light board is adjusted according to the forward voltage value of the reference light board, which can avoid the installation position of the display device affecting the calibration of the target light board, and there is no need to purchase additional photosensitive instruments, which can improve the calibration convenience of the display device and reduce the calibration cost.

[0010] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic diagram of a display device according to an embodiment of the present invention.

[0012] Figure 2 It is a schematic diagram of a driving circuit and a light emitting diode according to an embodiment of the present invention.

[0013] Figure 3 is a schematic diagram of another display device according to an embodiment of the present invention.

[0014] Figure 4 It is a schematic diagram of brightness attenuation of a light emitting diode according to an embodiment of the present invention.

[0015] Figure 5 It is a schematic diagram of a forward voltage value shift of a light emitting diode according to an embodiment of the present invention.

[0016] Figure 6 It is a schematic diagram of brightness adjustment of a light emitting diode according to an embodiment of the present invention.

[0017] Figure 7 It is a schematic diagram of adjusting the forward voltage value of a light emitting diode according to an embodiment of the present invention.

[0018] Figure 8 The figure is a flow chart of a brightness adjustment method of a display device according to an embodiment of the present invention.

[0019] Fig. 9 It is a flow chart of a method for adjusting the forward voltage value of a target lamp panel according to another embodiment of the present invention.

[0020] Description of reference numerals:

[0021] 100: Display device

[0022] P1~P3: Light board

[0023] 102: Control circuit

[0024] 104: Storage circuit

[0025] 106: Driving circuit

[0026] LD1~LDn: Light Emitting Diode

[0027] 202: Drive

[0028] R1~Rn:resistance

[0029] If1~Ifn: driving current

[0030] Vf1~Vfn, AV1: forward voltage value

[0031] P1-1~PN-M: Light board

[0032] H1-1~HN-M:Connection board

[0033] C1~C4:Curve

[0034] ΔV1, ΔV2, ΔV3: forward voltage difference

[0035] ΔB1, ΔB2, ΔB3: Brightness difference

[0036] V1: Initial forward voltage value

[0037] B1: Initial brightness value

[0038] AB1: Brightness value

[0039] S802-S806: Steps of a method for adjusting brightness of a display device

[0040] S902-S906: Method steps for adjusting the driving current of the target light panel. DETAILED DESCRIPTION

[0041] The above-mentioned other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only the directions with reference to the accompanying drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention.

[0042] Figure 1 is a schematic diagram of a display device according to an embodiment of the present invention, please refer to Figure 1 , the display device 100 may include a plurality of light boards P1-P3 and a control circuit 102, wherein the plurality of light boards P1-P3 are coupled to the control circuit 102. The light boards P1-P3 may include a storage circuit 104, a driving circuit 106, and a plurality of light emitting diodes LD1-LDn, respectively, wherein n is a positive integer. The control circuit 102 may be, for example, a micro control unit (MCU), but is not limited thereto, and the number of light boards is not limited to 1. Figure 1 The 3 shown are limited.

[0043] The driving circuit 106 can drive the light-emitting diodes LD1~LDn, and detect the forward voltage value of at least one of the light-emitting diodes LD1~LDn as the forward voltage value of the corresponding lamp board P1. Similarly, the driving circuit of the lamp board P2 can detect the forward voltage value of its own light-emitting diode as the forward voltage value of the corresponding lamp board P2, and the same is true for the light board P3, but not limited to this. Figure 2 1 is a schematic diagram of a driving circuit and a light emitting diode according to an embodiment of the present invention. Figure 2As shown, taking the lamp panel P1 as an example, it includes a driver 202 and resistors R1-Rn, the resistors R1-Rn are respectively coupled between the driver 202 and the corresponding light emitting diodes LD1-LDn (for example, the resistor R1 is coupled between the driver 202 and the light emitting diode LD1), and the common node of the resistors R1-Rn and the light emitting diodes LD1-LDn can be coupled to the detection input terminal of the driver 202. The driver 202 can provide driving currents If1-Ifn to the light emitting diodes LD1-LDn to drive the light emitting diodes LD1-LDn to emit light, and the driver 202 can receive the feedback voltage value (that is, the forward voltage value Vf1-Vfn of the light emitting diodes LD1-LDn) generated at the common node between the resistors R1-Rn and the light emitting diodes LD1-LDn through its detection input terminal, thereby obtaining the forward voltage value Vf1-Vfn of the light emitting diodes LD1-LDn. For example, the detection input terminal of the driver 202 receives the feedback voltage value generated at the common node of the resistor R1 and the light emitting diode LD1, wherein the feedback voltage value represents the forward voltage value Vf1. The driver 202 can use at least one of the forward voltage values ​​Vf1-Vfn as the forward voltage value of the corresponding lamp board (for example, the lamp board P1 in the example). In other embodiments, only the common nodes of some resistors R1-Rn and the light emitting diodes LD1-LDn can be connected to the detection input terminal of the driver 202, for example, the common nodes of R1, R2, R3 (R2, R3 are not shown) of the resistors R1-Rn and LD1, LD2, LD3 (LD2, LD3 are not shown) of the light emitting diodes LD1-LDn (corresponding to the forward voltage values ​​Vf1, Vf2, Vf3) are connected to the detection input terminal of the driver 202, instead of connecting all the common nodes of the resistors R1-Rn and the light emitting diodes LD1-LDn to the detection input terminal of the driver 202.

[0044] Please continue to refer to Figure 1 and Figure 2The storage circuit 104 can be used to store the forward voltage value of the light-emitting diode detected by the driving circuit 106 and other calibration parameters (such as the initial brightness value, the initial forward voltage value, but not limited to this). The storage circuit 104 can store the forward voltage values ​​of multiple light-emitting diodes. In some embodiments, the control circuit 102 can use the average value of the forward voltage values ​​of multiple light-emitting diodes in a light board as the forward voltage value of this light board, but not limited to this, and can also only take the average value of the forward voltage values ​​of some light-emitting diodes as the forward voltage value of this light board. For example, only set measurement pins in the middle or four corners of the light board to measure the average value of the forward voltage values ​​of the light-emitting diodes as the forward voltage value of this light board. In this way, circuit area can be saved. When the target light board replaces one of the multiple light boards P1-P3, the control circuit 102 may use at least one of the unreplaced light boards as a reference light board, and make the forward voltage values ​​of the target light board and the reference light board tend to be consistent (for example, make the voltage difference between the forward voltage value of the target light board and the forward voltage value of the reference light board fall within a preset range), so that the target light board and the reference light board have the same or similar brightness, thereby solving the problem of inconsistent brightness between the target light board and other light boards. The degree to which the forward voltage value of the target light board approaches the forward voltage value of the reference light board can be determined, for example, by the brightness difference between the target light board and the reference light board. Since the average human eye cannot distinguish a brightness error within 3%, when the brightness difference between the target light board and the reference light board is less than 3%, it can be considered that the forward voltage values ​​of the target light board and the reference light board have tended to be consistent.

[0045] For example, assuming that the target light board is used to replace the light board P2, at least one of the light boards P1 and P3 can be used as a reference light board. The control circuit 102 can, for example, use the light board P1 as a reference light board and adjust the driving current If1~Ifn of the target light board so that the forward voltage value of the target light board (that is, the forward voltage values ​​Vf1~Vfn of the light emitting diodes LD1~LDn in the target light board) and the forward voltage value of the light board P1 tend to be consistent. For another example, the light boards P1 and P3 can be used as reference light boards, and the driving current If1~Ifn of the target light board can be adjusted so that the forward voltage value of the target light board and the average value of the forward voltage values ​​of the light boards P1 and P2 tend to be consistent.

[0046] Figure 3 is a schematic diagram of another display device according to an embodiment of the present invention. Figure 3 The architecture and Figure 1 The only difference is that there are multiple hubs and more light boards, which will be explained in detail below. Figure 1 , Figure 2 As a reference to the aforementioned embodiments, the reference light board may be, for example, a light board adjacent to the replaced light board, that is, a light board adjacent to the target light board, but is not limited thereto. Figure 3In the embodiment, assuming that the target light board is light board P2-2, the reference light board may be, for example, light board P1-2 or light board P1-1, or three light boards such as light boards P1-1, P1-2 and P2-1. When multiple light boards are used as reference light boards, the driving currents If1 to Ifn of the target light board may be adjusted according to the average value of the forward voltages of the multiple reference light boards, so that the forward voltage of the target light board is consistent with the average value of the forward voltages of the multiple reference light boards. Figure 3 In an embodiment, the display device 100 may further include a hub board H1-1~HN-M, which is coupled between the corresponding light boards P1-1~PN-M and the control circuit 102, wherein N and M are positive integers. The hub board H1-1~HN-M can store the position information (e.g., coordinate information) of the corresponding light boards P1-1~PN-M to provide the position of the target light board to the control circuit 102 when the target light board is replaced. The hub board H1-1~HN-M can also provide the power required for the operation of the light boards P1-1~PN-M. In other embodiments, the position information of the light boards P1-1~PN-M can also be stored in the storage circuit 104 of the light boards P1-1~PN-M.

[0047] In this way, the forward voltage value of the target lamp board is adjusted according to the forward voltage value of the reference lamp board, and the forward voltage value of the target lamp board is made consistent with the forward voltage value of the reference lamp board. There is no need to purchase a photosensitive instrument to calibrate the brightness value, and the installation position of the display device can be prevented from affecting the calibration of the target lamp board, thereby effectively improving the calibration convenience of the display device and reducing the calibration cost.

[0048] Figure 4 is a schematic diagram of brightness attenuation of a light emitting diode according to an embodiment of the present invention, Figure 5 1 is a schematic diagram of a forward voltage value offset of a light emitting diode according to an embodiment of the present invention. Specifically, the storage circuit 106 can store the initial brightness value, the initial forward voltage value, the current forward voltage value, and multiple ratios of the forward voltage difference value and the brightness difference value corresponding to different usage time lengths. For example, Figure 4 and Figure 5As shown, the storage circuit 106 can store the ratios XT1, XT2 and XT3 of the forward voltage difference and the brightness difference corresponding to different usage time lengths T1, T2, and T3 on the curves C1 and C3, wherein XT1=ΔV1 / ΔB1, XT2=ΔV2 / ΔB2, XT3=ΔV3 / ΔB3, ΔV1, ΔV2, and ΔV3 are the forward voltage differences corresponding to the time lengths T1, T2, and T3, ΔB1, ΔB2, and ΔB3 are the brightness differences of the lamp board (light-emitting diode) corresponding to the time lengths T1, T2, and T3, and the time lengths T1, T2, and T3 can be, for example, 1 / 4, 2 / 4, and 3 / 4 of the service life of the lamp board. For example, if the service life of the lamp board is 100,000 hours, the time lengths T1, T2, and T3 can be 25,000 hours, 50,000 hours, and 75,000 hours, respectively. However, this is not limited to this, and it can also be a region where the slope of the curve is relatively gentle, for example Figure 4 In the middle curve C1, the area with a relatively gentle slope is, for example, between 3000 hours and 11000 hours. Therefore, the time lengths T1, T2, and T3 can be, for example, 6000 hours for time length T1, 7000 hours for time length T2, and 8000 hours for time length T3. In the area with a relatively gentle slope, the brightness of the lamp panel will not change too drastically even at different temperatures. In some embodiments, when using the ratios XT1, XT2, and XT3, the time points T1, T2, and T3 used are not necessarily the time points when the target lamp panel replaces the existing lamp panel. For example, the time point of the stored ratio XT1 is 25,000 hours, but the current reference lamp panel is used for 37,500 hours. In order to find the ratio XT corresponding to the reference lamp panel at 37,500 hours, the data of the ratio XT1 (25,000 hours) and the ratio XT2 (50,000 hours) are used for interpolation calculation, and then the ratio XT corresponding to the reference lamp panel at 37,500 hours is found, thereby reducing the error.

[0049] The control circuit 102 can calculate the brightness difference of the reference light board according to the initial forward voltage value V1 of the reference light board, the current forward voltage value, and the ratio of the forward voltage difference value to the brightness difference value corresponding to the current use time length of the reference light board, calculate the current brightness value of the reference light board according to the brightness difference value of the reference light board and the initial brightness value B1 of the reference light board, and control the driving circuit 106 of the target light board to adjust the driving current of the target light board according to the current brightness value of the reference light board. For example, assuming that the current use time length of the reference light board is the time length T1, since the initial forward voltage value V1 and the current forward voltage value are known (detected by the driving circuit 106), the forward voltage difference ΔV1 (the difference between the initial forward voltage value V1 and the current forward voltage value) can be known, and the brightness difference ΔB1 can be calculated by the known ratio XT1. In addition, the current brightness value of the reference light board can be calculated according to the brightness difference ΔB1 and the known initial brightness value B1 of the reference light board. After obtaining the current brightness value of the reference light board, since the initial forward voltage value V1, initial brightness value B1 and the changing relationship between the forward voltage value and the brightness value (that is, the ratio XT1) of the target light board are also known, the current brightness value of the reference light board is applied to the current brightness value of the target light board (the intention is to make the brightness values ​​of the reference light board and the target light board consistent), and then the forward voltage value that the target light board should reach can be obtained. Therefore, the control circuit 102 can make the forward voltage values ​​of the target light board and the reference light board tend to be consistent by adjusting the driving current of the target light board, that is, make the brightness of the target light board and the reference light board tend to be consistent.

[0050] Figure 6 is a schematic diagram of brightness adjustment of a light emitting diode according to an embodiment of the present invention, Figure 7 FIG. 1 is a schematic diagram of adjusting the forward voltage value of a light emitting diode according to an embodiment of the present invention. Figure 6 , Figure 7 As shown, the control circuit 102 can adjust the brightness value of the target light board from the initial brightness value B1 to the brightness of the reference light board by adjusting the driving current of the target light board (reducing the driving current of the target light board can make the brightness of the target light board close to the brightness of the reference light board). Figure 4 The target lamp panel has the same brightness value AB1 as the reference lamp panel (taking the time length of the reference lamp panel as T1 as an example), at this time, the forward voltage value of the target lamp panel is adjusted by the control circuit 102 from Vf1 to the same brightness value as the reference lamp panel. Figure 5 The forward voltage value AV1 of the reference lamp board tends to be consistent (taking the time length of the reference lamp board as T1 as an example), that is, Figure 7 The forward voltage difference ΔV1 (forward voltage offset) of the target lamp board is Figure 5 If the forward voltage difference ΔV1 (forward voltage value offset) of the reference light board is close to the same, the brightness of the target light board and the reference light board will also be close to the same.

[0051] It is worth noting that the storage circuit 106 can also store the ratio of the forward voltage difference and the brightness difference corresponding to different usage time lengths T1, T2, and T3 on the corresponding curves C2 and C4, wherein the above-mentioned curves C1 and C3 are curves corresponding to the same ambient temperature, and curves C2 and C4 are curves corresponding to another ambient temperature. The control circuit 102 can use the corresponding curves to adjust the driving current of the target lamp board according to different ambient temperatures. As described in the previous example, if the current usage time length of the reference light board is not exactly the time length T1, T2 or T3, the control circuit 102 interpolates (or extrapolates) the forward voltage difference corresponding to the different usage time lengths of the reference light board stored in the storage circuit 104 (for example, the time lengths T1, T2 or T1, T3), and interpolates (or extrapolates) the brightness difference corresponding to the different usage time lengths of the corresponding reference light board stored in the storage circuit 104 to obtain the ratio of the forward voltage difference to the brightness difference corresponding to the current usage time length of the reference light board, and then adjusts the drive current of the target light board in the manner described in the above embodiment. In addition, in some embodiments, the current forward voltage value of the reference light board may also be, for example, the average value of multiple reference light boards, rather than being limited to the current forward voltage value of a single reference light board.

[0052] Figure 8 is a flow chart of a brightness adjustment method of a display device according to an embodiment of the present invention. Figure 8 . It can be seen from the above embodiments that the brightness adjustment method of the display device may include at least the following steps. First, the forward voltage value of at least one light emitting diode of at least one reference light board among a plurality of light boards is detected as the forward voltage value of the reference light board (step S802), wherein the reference light board may be, for example, a light board adjacent to the target light board. Next, the forward voltage value of at least one light emitting diode in the target light board is detected as the forward voltage value of the target light board (step S804), and the target light board is a new light board used to replace the old light board. Afterwards, when the target light board replaces one of the multiple light boards, the forward voltage values ​​of the target light board and the reference light board are made consistent (step S806). For example, the driving current of the target light board can be adjusted according to the forward voltage value of the target light board and the forward voltage value of the reference light board, so that the forward voltage values ​​of the target light board and the reference light board are made consistent. There can be one or more reference light boards for adjusting the driving current. For example, the driving current of the target light board can be adjusted according to the average value of the forward voltage values ​​of multiple reference light boards around the target light board.

[0053] Furthermore, the method of adjusting the driving current of the target light board can be as follows: Fig. 9As shown, first, the brightness difference of the reference light board is calculated based on the initial forward voltage value of the reference light board, the current forward voltage value, and the ratio of the forward voltage difference value to the brightness difference value corresponding to the usage time length of the reference light board (step S902). In some embodiments, if the usage time length of the reference light board is not exactly equal to the pre-stored usage time length, interpolation or extrapolation operation can be performed based on the forward voltage difference values ​​corresponding to the different usage time lengths of the pre-stored reference light board, and interpolation or extrapolation operation can be performed based on the brightness difference values ​​corresponding to the different usage time lengths of the pre-stored reference light board, so as to obtain the ratio of the forward voltage difference value to the brightness difference value corresponding to the current usage time length of the reference light board. Next, the current brightness value of the reference light board is calculated based on the brightness difference value of the reference light board and the initial brightness value of the reference light board (step S904). Thereafter, the driving current of the target light board is adjusted based on the current brightness value of the reference light board (step S906).

[0054] In summary, the driving circuit of the embodiment of the present invention can detect the forward voltage value of the light emitting diode, and the control circuit can adjust the forward voltage value of the target light board according to the forward voltage value of the reference light board, so that the forward voltage value of the target light board is consistent with the forward voltage value of the reference light board, thereby correcting the brightness of the target light board and solving the problem of inconsistent brightness between the target light board and other light boards. In this way, by adjusting the forward voltage value of the target light board according to the forward voltage value of the reference light board, the installation position of the display device can be prevented from affecting the calibration of the target light board, and there is no need to purchase additional photosensitive instruments, which can improve the calibration convenience of the display device and reduce the calibration cost.

[0055] However, the above is only a preferred embodiment of the present invention, and it should not be used to limit the scope of the implementation of the present invention. That is, all simple equivalent changes and modifications made according to the claims and the content of the invention are still within the scope of the patent of the present invention. In addition, any embodiment or claim of the present invention does not need to achieve all the purposes, advantages or features disclosed by the present invention. In addition, the abstract and title (invention name) are only used to assist in the retrieval of patent documents, and are not used to limit the scope of rights of the present invention. Furthermore, the first, second, etc. mentioned in the specification are only used to indicate the names of the components, and are not used to limit the upper or lower limits on the number of components.

Claims

1. A display device, characterized in that: The display device includes a plurality of light panels and a control circuit, wherein: Each light board includes a plurality of light emitting diodes, a driving circuit and a storage circuit, wherein: The driving circuit is used to drive the plurality of light emitting diodes, and detect a forward voltage value of at least one of the plurality of light emitting diodes as a forward voltage value corresponding to the light board; and The storage circuit stores the forward voltage value of the at least one light emitting diode; and The control circuit is coupled to the plurality of light boards, wherein the plurality of light boards include at least one reference light board; When the target lamp board replaces one of the plurality of lamp boards, the forward voltage values ​​of the target lamp board and the at least one reference lamp board tend to be consistent.

2. The display device according to claim 1, characterized in that The control circuit controls the driving circuit of the target lamp board to adjust the driving current of the target lamp board according to the forward voltage value of the target lamp board and the forward voltage value of the at least one reference lamp board, so that the forward voltage values ​​of the target lamp board and the at least one reference lamp board tend to be consistent.

3. The display device according to claim 2, characterized in that: The control circuit controls the driving circuit of the target lamp board to adjust the driving current of the target lamp board according to the average value of the forward voltage values ​​of a plurality of reference lamp boards around the target lamp board.

4. The display device according to claim 2, characterized in that: The storage circuit also stores an initial brightness value, an initial forward voltage value, a current forward voltage value, and multiple ratios of the forward voltage difference and the brightness difference corresponding to different usage time lengths. The control circuit also calculates the brightness difference of the at least one reference light board based on the initial forward voltage value of the at least one reference light board, the current forward voltage value, and the ratio of the forward voltage difference and the brightness difference corresponding to the current usage time of the at least one reference light board. The control circuit calculates the current brightness value of the at least one reference light board based on the brightness difference of the at least one reference light board and the initial brightness value of the at least one reference light board, and controls the driving circuit of the target light board to adjust the driving current of the target light board based on the current brightness value of the at least one reference light board.

5. The display device according to claim 4, characterized in that: The control circuit also performs interpolation operations based on the forward voltage difference values ​​corresponding to different usage time lengths of the at least one reference light board stored in the storage circuit, and performs interpolation operations based on the brightness difference values ​​corresponding to different usage time lengths of the at least one reference light board stored in the storage circuit, so as to obtain the ratio of the forward voltage difference value to the brightness difference value corresponding to the current usage time length of the at least one reference light board.

6. The display device according to claim 1, characterized in that: The driving circuit comprises a driver and a plurality of resistors, wherein: The multiple resistors are respectively coupled between the driver and corresponding LEDs among the multiple LEDs. The driver receives at least one feedback voltage value from at least one common connection point between the multiple resistors and the multiple LEDs to detect the forward voltage value of the corresponding LED among the multiple LEDs.

7. The display device according to claim 1, characterized in that: The storage circuit of each light board also stores the position information of each light board.

8. The display device according to claim 1, characterized in that: The display device further comprises a plurality of wiring boards, wherein: The plurality of hubs are respectively coupled to the control circuit and corresponding light boards, and provide position information of the plurality of light boards to the control circuit.

9. The display device according to claim 1, characterized in that: The at least one reference light board is a light board adjacent to the target light board.

10. A method for adjusting brightness of a display device, characterized in that: The display device includes a plurality of light panels, each of which includes a plurality of light emitting diodes. The brightness adjustment method of the display device includes: Detecting a forward voltage value of at least one light emitting diode of at least one reference light board among the plurality of light boards as a forward voltage value of the at least one reference light board; Detecting a forward voltage value of at least one light emitting diode in a target light board as a forward voltage value of the target light board; When the target lamp board replaces one of the plurality of lamp boards, the forward voltage values ​​of the target lamp board and the at least one reference lamp board tend to be consistent.

11. The brightness adjustment method of a display device according to claim 10, characterized in that: The brightness adjustment method of the display device comprises: The driving current of the target lamp board is adjusted according to the forward voltage value of the target lamp board and the forward voltage value of the at least one reference lamp board, so that the forward voltage values ​​of the target lamp board and the at least one reference lamp board tend to be consistent.

12. The brightness adjustment method of a display device according to claim 11, characterized in that: The brightness adjustment method of the display device comprises: The driving current of the target lamp board is adjusted according to an average value of forward voltage values ​​of a plurality of reference lamp boards around the target lamp board.

13. The brightness adjustment method of a display device according to claim 11, characterized in that: The brightness adjustment method of the display device comprises: Calculating the brightness difference of the at least one reference light board according to the initial forward voltage value of the at least one reference light board, the current forward voltage value, and the ratio of the forward voltage difference value corresponding to the usage time length of the at least one reference light board to the brightness difference value; Calculating a current brightness value of the at least one reference light board according to the brightness difference value of the at least one reference light board and the initial brightness value of the at least one reference light board; and The driving current of the target light panel is adjusted according to the current brightness value of the at least one reference light panel.

14. The brightness adjustment method of a display device according to claim 13, characterized in that: The brightness adjustment method of the display device comprises: Interpolation operation is performed based on the forward voltage difference corresponding to different usage time lengths of the at least one reference light board, and interpolation operation is performed based on the brightness difference corresponding to different usage time lengths of the at least one reference light board, so as to obtain the ratio of the forward voltage difference to the brightness difference corresponding to the current usage time length of the at least one reference light board.

15. The brightness adjustment method of a display device according to claim 10, characterized in that: The at least one reference light board is a light board adjacent to the target light board.

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