Method of calibrating luminance and display

Abstract

A method for calibrating luminance, suitable for a backlight module, includes: (a) measuring luminance of a plurality of luminance sub-areas of the backlight module; (b) calculating average luminance of the plurality of luminance sub-areas according to the luminance of each luminance sub-area; (c) increasing backlight current of the backlight module so that the luminance of each luminance sub-area is increased to be greater than the average luminance; (d) obtaining preset luminance of each luminance sub-area after light passes through a liquid crystal shutter according to the increased luminance of each luminance sub-area and data information; and (e) calculating pixel voltage value of the liquid crystal shutter corresponding to each luminance sub-area according to the increased luminance of each luminance sub-area, the preset luminance and the data information.

Description

Technical Field

[0001] This case relates to brightness calibration technology for displays, and in particular to a method for calibrating brightness and a display. Background Technology

[0002] Direct-lit backlight modules are widely used in display technology, but they are prone to localized or regional brightness unevenness. The main reason is that the brightness of each LED is difficult to be completely uniform, and the gaps between the various optical materials and films (such as diffusion films and brightness enhancement films) stacked above the LEDs may be inconsistent, further leading to brightness unevenness. This unevenness typically manifests as differences in brightness emitted by different areas of the backlight module, thus affecting the overall uniformity of the display. Furthermore, this problem can occur regardless of whether the backlight module uses traditionally packaged LEDs or Mini LEDs.

[0003] In dual-screen display applications, due to the need for high-brightness backlighting, direct-lit light source designs are typically used, which also easily leads to localized or regional brightness unevenness. To address this issue, common traditional approaches include using a large number of LED driver ICs to control current uniformity, or improving brightness uniformity by increasing the haze value of the diffusion film or diffuser plate within the backlight module. However, the former increases the cost and complexity of the driver IC and surrounding circuit design, while the latter significantly reduces the overall brightness of the backlight module, affecting display performance.

[0004] Therefore, the industry still needs a technical solution that can effectively improve brightness uniformity without increasing additional hardware costs or significantly reducing the brightness of the backlight module. Summary of the Invention

[0005] In some embodiments, a method for calibrating brightness, applicable to a backlight module, includes: (a) measuring the brightness of a plurality of brightness sub-regions of the backlight module; (b) calculating the average brightness of the plurality of brightness sub-regions based on the brightness of each brightness sub-region; (c) increasing the backlight current of the backlight module so that the brightness of each brightness sub-region is increased to be greater than the average brightness; (d) determining the preset brightness of light passing through a liquid crystal light valve in each brightness sub-region based on the increased brightness of each brightness sub-region and data information, wherein the preset brightness corresponding to each brightness sub-region is the same; and (e) calculating the pixel voltage value of the liquid crystal light valve corresponding to each brightness sub-region based on the increased brightness of each brightness sub-region, the preset brightness, and data information.

[0006] In some embodiments, step (a) includes: (a1) measuring the brightness area of ​​the backlight module to obtain brightness data; and (a2) dividing the brightness area into multiple brightness sub-regions based on the brightness data.

[0007] In some embodiments, step (c) includes: (c1) increasing the backlight current to enhance the brightness of each brightness sub-region of the backlight module; (c2) measuring the enhanced brightness of each brightness sub-region of the backlight module; (c3) determining whether the minimum brightness of each brightness sub-region is greater than the average brightness of step (b); and (c4) when the minimum brightness of each brightness sub-region is greater than the average brightness, storing the backlight current value in a first memory and then executing step (d).

[0008] In some embodiments, step (c) includes: (c5) if the minimum value of the brightness of each brightness sub-region is still less than the average brightness, step (c1) is executed again.

[0009] In some embodiments, step (d) includes: (d1) multiplying the minimum value of the brightness of each brightness sub-region of the backlight module that has been enhanced by the maximum transmittance of the liquid crystal light valve in the data information to obtain a preset brightness.

[0010] In some embodiments, the data information is the VT (voltage-transmittance) relationship curve of the liquid crystal light valve. Step (e) includes: (e1) dividing the preset brightness by the brightness of each brightness sub-region to obtain multiple transmittances; (e2) finding the pixel voltage value corresponding to each transmittance according to the VT (voltage-transmittance) relationship curve; and (e3) storing the pixel voltage value corresponding to each transmittance in a first memory.

[0011] In some embodiments, a display includes a liquid crystal light valve module, a backlight module, a luminance meter, and a calibration control module. The liquid crystal light valve module includes a liquid crystal light valve, a control circuit, and a first memory. The control circuit is coupled to the liquid crystal light valve and the first memory. The backlight module is coupled to the control circuit. The backlight module includes a brightness region. The luminance meter is used to measure the brightness region of the backlight module to obtain brightness data. The calibration control module is coupled to the backlight module, the luminance meter, and the first memory. The calibration control module is used to: divide the brightness region into multiple brightness sub-regions based on the brightness data; calculate the average brightness of the multiple brightness sub-regions based on the brightness of each brightness sub-region; increase the backlight current of the backlight module so that the brightness of each brightness sub-region is increased to be greater than the average brightness; determine the preset brightness of light passing through the liquid crystal light valve in each brightness sub-region based on the increased brightness of each brightness sub-region and data information, wherein the preset brightness corresponding to each brightness sub-region is the same; and calculate the pixel voltage value of the liquid crystal light valve corresponding to each brightness sub-region based on the increased brightness of each brightness sub-region, the preset brightness, and data information.

[0012] In some embodiments, the calibration control module is used to: increase the backlight current to enhance the brightness of each brightness sub-region of the backlight module; measure the enhanced brightness of each brightness sub-region of the backlight module using a luminance meter; determine whether the minimum brightness of each brightness sub-region is greater than the average brightness; and when the minimum brightness of each brightness sub-region is greater than the average brightness, store the backlight current value in a first memory, and determine the preset brightness of each brightness sub-region after the light passes through the liquid crystal light valve based on the enhanced brightness of each brightness sub-region and data information.

[0013] In some embodiments, the calibration control module is used to: increase the backlight current again when the minimum brightness of each brightness sub-region is still less than the average brightness.

[0014] In some embodiments, the calibration control module is used to: multiply the minimum brightness of each brightness sub-region of the backlight module that has been enhanced by the maximum transmittance of the liquid crystal light valve in the data information to obtain a preset brightness.

[0015] In some embodiments, the data information is the VT (voltage-transmittance) relationship curve of the liquid crystal light valve. The calibration control module is used to: divide the preset brightness by the brightness of each brightness sub-region to obtain multiple transmittances; and find the pixel voltage value corresponding to each transmittance according to the VT (voltage-transmittance) relationship curve; and store the pixel voltage value corresponding to each transmittance in the first memory.

[0016] In some embodiments, the display includes a second memory. The second memory is coupled to the calibration control module. The second memory is used to store data information. The calibration control module is used to read data information from the second memory.

[0017] In some embodiments, a display includes a liquid crystal light valve module as described in any of the above embodiments, a backlight module as described in any of the above embodiments, and a motherboard. The motherboard is coupled to a control circuit and the backlight module. The motherboard is used to provide control signals. The control circuit is used to retrieve a plurality of pixel voltage values ​​and a backlight current value from a first memory according to the control signals, and output the plurality of pixel voltage values ​​to the liquid crystal light valve and output the backlight current value to the backlight module.

[0018] In some embodiments, the display includes a liquid crystal screen. The liquid crystal screen is disposed on the upper surface of the liquid crystal light valve.

[0019] In some embodiments, the liquid crystal light valve is a torsion nematic liquid crystal display, a vertically aligned liquid crystal display, or a transverse electric field effect liquid crystal display.

[0020] In some embodiments, the liquid crystal screen is a twisted nematic liquid crystal display, a vertically aligned liquid crystal display, or a transverse electric field effect liquid crystal display.

[0021] In some embodiments, the liquid crystal light valve is a monochrome liquid crystal display screen.

[0022] The following detailed description of the features and advantages of this invention is sufficient to enable anyone skilled in the art to understand the technical content of this invention and implement it accordingly. Furthermore, based on the disclosure of this specification, the claims, and the accompanying drawings, anyone skilled in the art can easily understand the relevant objectives and advantages of this invention. Attached Figure Description

[0023] Figure 1 This is a block diagram illustrating one embodiment of a display.

[0024] Figure 2 A flowchart of one embodiment of a method for calibrating brightness.

[0025] Figure 3 This is a flowchart of one embodiment of step S01.

[0026] Figure 4 This is a schematic diagram of an embodiment of a backlight module, a liquid crystal light valve, a liquid crystal screen, and multiple brightness sub-regions.

[0027] Figure 5 This is a flowchart of one embodiment of step S03.

[0028] Figure 6 This is a flowchart of one embodiment of step S04.

[0029] Figure 7 This is a schematic diagram of an embodiment of steps S03 and S04.

[0030] Figure 8 This is a flowchart of one embodiment of step S05.

[0031] Figure 9 This is a schematic diagram of one embodiment of data information.

[0032] Figure 10 This is a block diagram illustrating another embodiment of the display.

[0033] In the attached figures, the following reference numerals are used:

[0034] 1: Monitor

[0035] 10: Luminometer

[0036] 11: Backlight Module

[0037] 12: Calibration Control Module

[0038] 13:LCD light valve

[0039] 14: First Memory

[0040] 15: Second Memory

[0041] 16: Motherboard

[0042] 17: Control Circuit

[0043] 18: LCD screen

[0044] 19: Optical component layer or optical film layer

[0045] 20: LCD light valve module

[0046] 111: LED light panel

[0047] 112: Optical film

[0048] S01~S05, S011~S012, S031~S034, S041, S051~S053: Steps

[0049] A, A1~A3, A1'~A3': Brightness

[0050] A': Preset brightness

[0051] R, R1~R3: Luminance sub-regions

[0052] D: Data Information

[0053] V1': Pixel voltage value Detailed Implementation

[0054] Figure 1 This is a block diagram illustrating one embodiment of display 1. Please refer to [link / reference]. Figure 1 The display 1 includes a liquid crystal light valve module 20, a backlight module 11, a luminance meter 10, and a calibration control module 12. The liquid crystal light valve module 20 includes a liquid crystal light valve 13, a control circuit 17, and a first memory 14. The control circuit 17 is coupled to the liquid crystal light valve 13 and the first memory 14. The backlight module 11 is coupled to the control circuit 17. The calibration control module 12 is coupled to the backlight module 11, the luminance meter 10, and the first memory 14.

[0055] In some embodiments, the luminance meter 10 may be, but is not limited to, a light sensing component (photodiode or phototransistor), a luminance sensor, or an image sensing component (such as a CMOS image sensor).

[0056] In some embodiments, the backlight module 11 may be, but is not limited to, a direct-lit backlight module, an edge-lit backlight module, or a Mini LED backlight module.

[0057] In some embodiments, the calibration control module 12 may be, but is not limited to, a microcontroller (MCU), a central processing unit (CPU), or a digital signal processor (DSP).

[0058] In some embodiments, the liquid crystal light valve 13 does not have a color filter, but this invention is not limited thereto. In some embodiments, the liquid crystal light valve 13 has a color filter. In some embodiments, the liquid crystal light valve 13 may be, but is not limited to, a colorless monochrome liquid crystal display, a colored liquid crystal display, or a liquid crystal display with partial colors. In some embodiments, the liquid crystal light valve 13 may be, but is not limited to, a twisted nematic liquid crystal display (TN-LCD), a vertically aligned liquid crystal display (VA-LCD), or a lateral electric field effect liquid crystal display (IPS-LCD).

[0059] In some embodiments, the first memory 14 may be a volatile storage medium, a non-volatile storage medium, or a combination thereof. Volatile storage media include, for example, random access memory (RAM), such as static random access memory (SRAM) or dynamic random access memory (DRAM). Non-volatile storage media include, for example, read-only memory (ROM), such as programmable read-only memory (PROM), erasable reprogrammable read-only memory (EPROM), electronically erasable reprogrammable read-only memory (EEPROM), programmable read-only memory (OTPROM), or flash memory. The type of the first memory 14 is not limited herein.

[0060] In some embodiments, the control circuit 17 may be, but is not limited to, a display driver circuit or a control IC.

[0061] Figure 2 A flowchart of one embodiment of a method for calibrating brightness. Please refer to [link / reference]. Figure 1 and Figure 2 In some embodiments, the luminance meter 10 and the calibration control module 12 are used to measure the luminance of multiple luminance sub-regions R of the backlight module 11 (step S01). Figure 3 This is a flowchart of one embodiment of step S01. Please refer to [link / reference]. Figure 2 and Figure 3In some embodiments, the backlight module 11 includes a brightness region, and the luminance meter 10 is used to measure the brightness region of the backlight module 11 to obtain brightness data (step S011). In some embodiments, since the brightness of each region of the brightness region is uneven, the calibration control module 12 is used to divide the brightness region into multiple brightness sub-regions R according to the brightness level of each region based on the brightness data (step S012), and each brightness sub-region R has a different brightness.

[0062] Figure 4 This is a schematic diagram of one embodiment of the backlight module 11, the liquid crystal light valve 13, the liquid crystal screen 18, and multiple brightness sub-regions R. Please refer to [link / reference]. Figure 4 .At Figure 4 In the backlight module 11, there are three brightness sub-regions R (i.e., brightness sub-region R1, brightness sub-region R2, and brightness sub-region R3), and brightness sub-regions R1, R2, and R3 have different brightness A (i.e., brightness A1, brightness A2, and brightness A3). Brightness A1 corresponds to brightness sub-region R1, brightness A2 corresponds to brightness sub-region R2, and brightness A3 corresponds to brightness sub-region R3. Figure 4 In the diagram, the width of the arrow representing luminance A represents the magnitude of luminance A; the wider the arrow representing luminance A, the greater the magnitude of luminance A. Therefore, in... Figure 4 In the luminance sub-region R2, luminance A2 is the largest, followed by luminance A1 in luminance sub-region R1, and luminance A3 in luminance sub-region R3 is the smallest. Figure 4 In this embodiment, the backlight module 11 includes three luminance sub-regions R, but the number of luminance sub-regions R included in the backlight module 11 is not limited to this. In some embodiments, the number of luminance sub-regions R included in the backlight module 11 is any positive integer. In some embodiments, the number of luminance sub-regions R included in the backlight module 11 is determined according to the luminance level of each region of the luminance module.

[0063] Following step S01, the calibration control module 12 calculates the average brightness of multiple brightness sub-regions R based on the brightness of each brightness sub-region R (step S02). Figure 4For example, if the sizes of luminance sub-regions R1, R2, and R3 are the same or different, the average luminance of these sub-regions is (luminance A1 + luminance A2 + luminance A3) / 3. In some embodiments, if the sizes of luminance sub-regions R1, R2, and R3 are different, the calibration control module 12 can perform a weighted calculation based on the area of ​​each luminance sub-region R. For example, the average luminance can be (luminance A1 * area of ​​luminance sub-region R1 + luminance A2 * area of ​​luminance sub-region R2 + luminance A3 * area of ​​luminance sub-region R3) / (area of ​​luminance sub-region R1 + area of ​​luminance sub-region R2 + area of ​​luminance sub-region R3) to improve the accuracy of the average luminance calculation.

[0064] Next, the calibration control module 12 increases the backlight current of the backlight module 11 so that the brightness of each brightness sub-region R is increased to be greater than the average brightness (step S03). Figure 5 This is a flowchart of one embodiment of step S03. Please refer to [link / reference]. Figure 2 and Figure 5 First, the calibration control module 12 controls the backlight module 11 to increase the backlight current, thereby enhancing the brightness of each brightness sub-region R of the backlight module 11 (step S031). Next, the calibration control module 12 measures the enhanced brightness of each brightness sub-region R of the backlight module 11 using the luminance meter 10 (step S032). Then, the calibration control module 12 determines whether the minimum brightness of each brightness sub-region R is greater than the average brightness (step S033). When the calibration control module 12 determines that the minimum brightness of each brightness sub-region R is greater than the average brightness, the calibration control module 12 stores the backlight current value in the first memory 14 (step S034). When the calibration control module 12 determines that the minimum brightness of each brightness sub-region R is still less than the average brightness, the calibration control module 12 again controls the backlight module 11 to increase the backlight current (i.e., executes step S031 again).

[0065] Next, the calibration control module 12 calculates the preset brightness A' of the light from each brightness sub-region R after passing through the liquid crystal light valve based on the brightness and data information D of each brightness sub-region R (step S04), wherein the preset brightness A' of each brightness sub-region R is the same. Figure 6 This is a flowchart of one embodiment of step S04. Please refer to [link / reference]. Figure 2 and Figure 6In some embodiments, the calibration control module 12 multiplies the minimum value of the brightness of each enhanced brightness sub-region R of the backlight module 11 by the maximum transmittance of the liquid crystal light valve 13 in the data information D to obtain a preset brightness A' (step S041). It should be noted here that since the value of the maximum transmittance is necessarily less than 1, the preset brightness A' is necessarily less than the minimum value of the brightness of each brightness sub-region R.

[0066] Here are examples to illustrate steps S03 and S04. Figure 7 This is a schematic diagram illustrating one embodiment of steps S03 and S04. Please refer to [link / reference]. Figure 4 and Figure 7 . Figure 7 The brightness values ​​A1, A2, and A3 in the figure are... Figure 4 The brightness A1, brightness A2, and brightness A3 are specified. First, the calibration control module 12 increases the backlight current of the backlight module 11 to enhance the brightness of the brightness sub-regions R1, R2, and R3 (i.e., brightness A1, brightness A2, and brightness A3) (step S031). Figure 7 In the process, the increased brightness A1, brightness A2, and brightness A3 are respectively brightness A1', brightness A2', and brightness A3'. Next, the calibration control module 12 measures brightness A1', brightness A2', and brightness A3' using the luminance meter 10 (step S032). Then, the calibration control module 12 determines the minimum value among brightness A1', brightness A2', and brightness A3' (in...). Figure 7 In step S033, the calibration control module 12 determines whether the brightness A3' (minimum value) is greater than the average brightness (average brightness of brightness A1, brightness A2, and brightness A3). When the calibration control module 12 determines that the brightness A3' is greater than the average brightness, the calibration control module 12 stores the backlight current value in the first memory 14 (step S034). Next, the calibration control module 12 multiplies the brightness A3' by the maximum transmittance of the liquid crystal light valve 13 in the data information D to obtain the preset brightness A' (step S041), wherein the preset brightness A' after the light from the brightness sub-regions R1, R2, and R3 passes through the liquid crystal light valve 13 is the same.

[0067] Finally, the calibration control module 12 calculates the pixel voltage value of the liquid crystal light valve 13 corresponding to each brightness sub-region R based on the increased brightness of each brightness sub-region R, the preset brightness A', and the data information D (step S05). In some embodiments, the data information D is the VT (voltage-transmittance) relationship curve of the liquid crystal light valve 13. Figure 8 This is a flowchart of one embodiment of step S05. Please refer to [link / reference]. Figure 2 and Figure 8First, the calibration control module 12 divides the preset brightness A' by the brightness of each brightness sub-region R to obtain multiple transmittances (step S051). Next, the calibration control module 12 finds the pixel voltage value corresponding to each transmittance based on the VT (voltage-transmittance) relationship curve (step S052). Finally, the calibration control module 12 stores the pixel voltage value corresponding to each transmittance in the first memory 14 (step S053). It should be noted that since the backlight module 11 contains multiple brightness sub-regions R, the first memory 14 will store multiple pixel voltage values.

[0068] Here is an example to illustrate step S05. Figure 9 This is a schematic diagram of one embodiment of data information D. Please refer to [link / reference]. Figure 9 . Figure 9 The data information D is the VT (voltage-transmittance) relationship curve of the liquid crystal light valve 13. Herein lies... Figure 7 Taking the brightness A1' of the brightness sub-region R1 as an example. First, the calibration control module 12 divides the preset brightness A' by the brightness A1' of the brightness sub-region R1 to obtain the transmittance corresponding to the brightness sub-region R1 (step S051). Next, the calibration control module 12 finds the pixel voltage value V1' corresponding to the transmittance of the brightness sub-region R1 according to the VT (voltage-transmittance) relationship curve (step S052). Finally, the calibration control module 12 stores the pixel voltage value V1' corresponding to the transmittance of the brightness sub-region R1 in the first memory 14 (step S053).

[0069] Please see again Figure 1 In some embodiments, the display 1 includes a second memory 15. The second memory 15 is coupled to the calibration control module 12. In some embodiments, the second memory 15 is used to store data information D. In some embodiments, the calibration control module 12 is used to read data information D from the second memory 15.

[0070] In some embodiments, the second memory 15 may be a volatile storage medium, a non-volatile storage medium, or a combination thereof. Volatile storage media include, for example, random access memory (RAM), such as static random access memory (SRAM) or dynamic random access memory (DRAM). Non-volatile storage media include, for example, read-only memory (ROM), such as programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electronically erasable programmable read-only memory (EEPROM), programmable read-only memory (OTPROM), or flash memory. The type of the second memory 15 is not limited herein.

[0071] Please see again Figure 4In some embodiments, the backlight module 11 includes an LED light panel 111 and an optical film 112, the optical film 112 being disposed on the upper surface of the LED light panel 111. In some embodiments, the display 1 includes a liquid crystal screen 18, the liquid crystal screen 18 being disposed on the upper surface of the liquid crystal light valve 13. In some embodiments, the liquid crystal screen 18 may be, but is not limited to, a twisted nematic liquid crystal display (TN-LCD), a vertically aligned liquid crystal display (VA-LCD), or a lateral electric field effect liquid crystal display (IPS-LCD). In some embodiments, an optical component layer or an optical film layer 19 is further disposed between the liquid crystal light valve 13 and the liquid crystal screen 18. In some embodiments, since the display 1 includes the liquid crystal light valve 13 and the liquid crystal screen 18, the display 1 is a dual-screen display.

[0072] Figure 10 This is a block diagram illustrating another embodiment of display 1. Please refer to... Figure 10 In some embodiments, the display 1 further includes a motherboard 16. The motherboard 16 is coupled to the control circuit 17, the backlight module 11, and the liquid crystal screen 18. In some embodiments, the motherboard 16 is used to provide control signals. In some embodiments, the motherboard 16 provides control signals when the display 1 is powered on. In some embodiments, the control circuit 17 is used to retrieve multiple pixel voltage values ​​and backlight current values ​​from the first memory 14 according to the control signals, and output the multiple pixel voltage values ​​to the liquid crystal light valve 13 and output the backlight current values ​​to the backlight module 11. In some embodiments, when the display 1 completes its operation... Figure 2 After the brightness calibration method is completed, the backlight module 11 and the first memory 14 are electrically disconnected from the calibration control module 12. In other words, in some embodiments, after the brightness calibration is completed, the luminance meter 10 and the calibration control module 12 are no longer necessary components for the operation of the display 1 and can be removed from the display 1. That is, in some embodiments, when the display 1 has completed the calibration... Figure 2 After the method for calibrating brightness, the display 1 includes a backlight module 11, a liquid crystal light valve module 20, a liquid crystal screen 18 and a motherboard 16, but does not include a luminance meter 10 and a calibration control module 12.

[0073] In summary, in some embodiments, the display 1, through precise control of light transmittance by the liquid crystal light valve 13, can significantly improve the brightness uniformity of the backlight module 11, avoiding image unevenness caused by regional brightness differences. Compared to traditional designs that rely on a large number of LED driver ICs to regulate the current in each area, or to increase the haze value of the diffusion film or diffusion plate to achieve uniformity, the display 1 effectively avoids the problems of increased hardware costs and design complexity, and overcomes the disadvantage of reduced overall brightness caused by traditional diffusion structures. Through the precise control of the liquid crystal light valve 13, the display 1 can achieve uniform brightness distribution while maintaining high brightness output, greatly improving display quality.

[0074] Furthermore, in some embodiments, the display 1 significantly reduces its design cost and complexity through an automated calibration mechanism. In some embodiments, the calibration control module 12 dynamically adjusts the backlight current and calculates the corresponding pixel voltage value based on the brightness data measured by the luminance meter 10, and stores the backlight current value and pixel voltage value in the first memory 14. When the display 1 is actually powered on, the motherboard 16 directly retrieves the backlight current value and pixel voltage value from the first memory 14 and outputs them to the liquid crystal light valve 13 and the backlight module 11, achieving an efficient and accurate brightness calibration process. This method not only saves the cost of the driver IC and peripheral circuits, but also improves the efficiency and reliability of the display 1's operation.

[0075] Although the technical content of this case has been disclosed above with reference to preferred embodiments, it is not intended to limit this case. Any modifications and refinements made by those skilled in the art without departing from the spirit of this case should be included within the scope of this case. Therefore, the scope of protection of this case shall be determined by the appended claims.

Claims

1. A method for calibrating brightness, applicable to backlight modules, characterized in that, Include: (a) Measuring the brightness of multiple brightness sub-regions of the backlight module; (b) Calculate the average brightness of the plurality of brightness sub-regions based on the brightness of each brightness sub-region; (c) Increase the backlight current of the backlight module so that the brightness of each brightness sub-region is increased to be greater than the average brightness; (d) Based on the increased brightness and data information of each of the brightness sub-regions, a preset brightness is obtained for the light from each of the brightness sub-regions after passing through the liquid crystal light valve, wherein the preset brightness corresponding to each of the brightness sub-regions is the same; and (e) Calculate the pixel voltage value of the liquid crystal light valve corresponding to each of the brightness sub-regions based on the increased brightness of each of the brightness sub-regions, the preset brightness, and the data information.

2. The method for calibrating brightness as described in claim 1, characterized in that, Step (a) includes: (a1) Measuring the brightness area of ​​the backlight module to obtain brightness data; and (a2) Divide the brightness region into the plurality of brightness sub-regions based on the brightness data.

3. The method for calibrating brightness as described in claim 1, characterized in that, Step (c) includes: (c1) Increase the backlight current to enhance the brightness of each of the brightness sub-regions of the backlight module; (c2) Measure the brightness of each of the enhanced brightness sub-regions of the backlight module; (c3) Determine whether the minimum value of the brightness of each brightness sub-region is greater than the average brightness; and (c4) When the minimum value of the brightness of each of the brightness sub-regions is greater than the average brightness, the backlight current value is stored in the first memory and then step (d) is executed.

4. The method for calibrating brightness as described in claim 3, characterized in that, Step (c) includes: (c5) If the minimum value of the brightness of each of the brightness sub-regions is still less than the average brightness, step (c1) is executed again.

5. The method for calibrating brightness as described in claim 1, characterized in that, Step (d) includes: (d1) Multiply the minimum value of the brightness of each of the enhanced brightness sub-regions of the backlight module by the maximum transmittance of the liquid crystal light valve in the data information to obtain the preset brightness.

6. The method for calibrating brightness as described in claim 1, characterized in that, The data information is the VT (voltage-transmittance) relationship curve of the liquid crystal light valve, and step (e) includes: (e1) Divide the preset brightness by the brightness of each of the brightness sub-regions to obtain multiple transmittances; (e2) Based on the VT (voltage-transmittance) relationship curve, find the pixel voltage value corresponding to each transmittance; and (e3) Store the pixel voltage value corresponding to each of the transmittances in the first memory.

7. A display, characterized in that, Include: A liquid crystal light valve module includes a liquid crystal light valve, a control circuit, and a first memory, wherein the control circuit is coupled to the liquid crystal light valve and the first memory; A backlight module, coupled to the control circuit, includes a brightness area; A luminance meter is used to measure the luminance area of ​​the backlight module to obtain luminance data; and The calibration control module, coupled to the backlight module, the luminance meter, and the first memory, is used to: The brightness region is divided into multiple brightness sub-regions based on the brightness data; The average brightness of the plurality of brightness sub-regions is calculated based on the brightness of each of the brightness sub-regions; Increase the backlight current of the backlight module so that the brightness of each brightness sub-region is increased to be greater than the average brightness. Based on the increased brightness and data information of each of the aforementioned brightness sub-regions, a preset brightness is obtained for the light from each of the aforementioned brightness sub-regions after passing through the liquid crystal light valve, wherein the preset brightness corresponding to each of the aforementioned brightness sub-regions is the same; and Based on the increased brightness of each of the brightness sub-regions, the preset brightness, and the data information, the pixel voltage value of the liquid crystal light valve corresponding to each of the brightness sub-regions is calculated.

8. The display as claimed in claim 7, characterized in that, The calibration control module is used for: Increase the backlight current to enhance the brightness of each of the brightness sub-regions of the backlight module; The brightness of each of the enhanced brightness sub-regions of the backlight module is measured by the luminance meter. Determine whether the minimum brightness value among the brightness sub-regions is greater than the average brightness; and When the minimum value of the brightness of each of the brightness sub-regions is greater than the average brightness, the current value of the backlight current is stored in the first memory, and the preset brightness of the light from each of the brightness sub-regions after passing through the liquid crystal light valve is obtained based on the increased brightness of each of the brightness sub-regions and the data information.

9. The display as claimed in claim 8, characterized in that, The calibration control module is used for: If the minimum brightness of each of the brightness sub-regions is still less than the average brightness, the backlight current is increased again.

10. The display as claimed in claim 7, characterized in that, The calibration control module is used for: The minimum value of the brightness of each of the enhanced brightness sub-regions of the backlight module is multiplied by the maximum transmittance of the liquid crystal light valve in the data information to obtain the preset brightness.

11. The display as claimed in claim 7, characterized in that, The data information is the VT (voltage-transmittance) relationship curve of the liquid crystal light valve, and the calibration control module is used for: Divide the preset brightness by the brightness of each of the brightness sub-regions to obtain multiple transmittances; Based on the VT (voltage-transmittance) relationship curve, find the pixel voltage value corresponding to each transmittance; and The pixel voltage value corresponding to each of the said transmittances is stored in the first memory.

12. The display as claimed in claim 7, characterized in that, The system includes a second memory coupled to the calibration control module, the second memory being used to store the data information, and the calibration control module being used to read the data information from the second memory.

13. A display, characterized in that, Include: The liquid crystal light valve module as described in any one of claims 7 to 12; The backlight module as described in any one of claims 7 to 12; and The motherboard, coupled to the control circuit and the backlight module, is used to provide control signals; The control circuit is used to extract the plurality of pixel voltage values ​​and the backlight current value from the first memory according to the control signal, and output the plurality of pixel voltage values ​​to the liquid crystal light valve and output the backlight current value to the backlight module.

14. The display as claimed in claim 13, characterized in that, It includes a liquid crystal screen, which is disposed on the upper surface of the liquid crystal light valve.

15. The display as claimed in claim 14, characterized in that, The liquid crystal light valve is a torsion nematic liquid crystal display, a vertically aligned liquid crystal display, or a transverse electric field effect liquid crystal display.

16. The display as claimed in claim 15, characterized in that, The liquid crystal screen is a twisted nematic liquid crystal display, a vertically aligned liquid crystal display, or a horizontally aligned electric field effect liquid crystal display.

17. The display as claimed in claim 16, characterized in that, The liquid crystal light valve is a monochrome liquid crystal display screen.

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