Display device and brightness correction method thereof

Abstract

The present application provides a display device and a brightness correction method thereof. The display device includes a liquid crystal display panel, a backlight module, a camera module, a data processor, a memory, and a control chip. The backlight module includes a light board, a pillar, and an optical film, and the pillar is arranged between the optical film and the light board. The camera module includes three cameras, each of which is equipped with a red, green, and blue filter. The cameras are arranged near the pillar and are used to capture the color data of light passing through the pillar. The data processor is used to process the color data of light passing through the pillar obtained by the camera module and calculate brightness correction data for the portion of the liquid crystal display panel corresponding to the pillar based on the color data. The control chip is used to read the brightness correction data from the memory and correct the brightness of the portion of the liquid crystal display panel corresponding to the pillar based on the brightness correction data. The display device provided by the present application can improve the overall image quality performance of the liquid crystal display.

Description

Technical Field

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

[0002] Liquid crystal displays (LCDs), as passive light-emitting display devices, require backlight modules to achieve display functions. Mini LED partitioned backlight technology has been introduced into traditional backlight modules.

[0003] Mini LED backlight technology improves the contrast and image quality of LCD displays by dividing the backlight into multiple independently controllable zones. However, to support the optical film, a support column is required on the Mini LED light board of the backlight module.

[0004] Since the material properties of the pillars change over time, the image quality of the area of ​​the LCD corresponding to the pillars may appear black or yellow, which seriously affects the overall image quality of the LCD.

[0005] Therefore, how to effectively improve the local image quality abnormality of liquid crystal displays caused by aging of the pillars of the backlight module has become a technical problem that needs to be solved urgently. Summary of the Invention

[0006] The embodiments of the present application provide a display device and a brightness correction method thereof, which can improve the overall image quality performance of a liquid crystal display.

[0007] An embodiment of the present application provides a display device, which includes: a liquid crystal display panel; a backlight module connected to the liquid crystal display panel, the backlight module including multiple light boards, multiple pillars and an optical film, the pillars being arranged between the optical film and the light board; a camera module arranged in the backlight module, the camera module being used to capture color data of light passing through the pillars; a data processor being used to process the color data of light passing through the pillars obtained by the camera module, and to calculate brightness correction data of the portion of the liquid crystal display panel corresponding to the pillars based on the color data; a memory being used to store the brightness correction data; and a control chip being used to read the brightness correction data from the memory, and to correct the brightness of the portion of the liquid crystal display panel corresponding to the pillars based on the brightness correction data.

[0008] In the above display device, the data processor is further used to calculate the brightness correction data of the liquid crystal display panel corresponding to the circular area defined by the center point of the top surface of the pillar and a preset radius based on the color data.

[0009] In the above display device, the data processor is further configured to calculate the brightness correction data from the center point to the edge of the circular area by interpolation.

[0010] In the above-mentioned display device, the memory is also used to store the address data of multiple pixels of the liquid crystal display panel corresponding to the circular area; the control chip is used to correct the brightness of the multiple pixels of the liquid crystal display panel corresponding to the circular area according to the brightness correction data and the address data.

[0011] In the above-mentioned display device, the camera module includes three cameras, and the three cameras are respectively configured with a red filter, a green filter, and a blue filter. The lens of the camera has a predetermined distance from the surface of the pillar, or the horizontal distance between the lens of the camera and the central axis of the pillar is less than or equal to 5 times the diameter of the bottom surface of the pillar.

[0012] In the above-mentioned display device, the data processor is used to obtain the first color data r0, the second color data g0, and the third color data b0 of the light passing through the pillar captured by the three cameras of the camera module at the first moment, and is used to obtain the fourth color data r1, the fifth color data g1, and the sixth color data b1 of the light passing through the pillar captured by the three cameras of the camera module at the second moment after the first moment, and is used to calculate the brightness difference values ​​ΔLv_r, ΔLv_g, and ΔLv_b according to formula (1), formula (2), and formula (3): ΔLv_r = r1-r0 (1); ΔLv_g = g1-g0 (2); ΔLv_b = b1-b0 (3); the data processor is also used to calculate the brightness correction data ΔR, ΔG, and ΔB according to formula (4), formula (5), and formula (6): ΔR=ΔLv_r / k (4); ΔG=ΔLv_g / k (5); ΔB=ΔLv_b / k (6); where k is the preset coefficient.

[0013] An embodiment of the present application also provides a brightness correction method for a display device, comprising: capturing color data of light passing through a pillar through a camera module, the pillar being arranged between an optical film and a light board of a backlight module of the display device, and the camera module being arranged inside the backlight module; calculating brightness correction data of a portion of a liquid crystal display panel corresponding to the pillar based on the color data; storing the brightness correction data in a memory; reading the brightness correction data from the memory; and correcting the brightness of a portion of the liquid crystal display panel corresponding to the pillar based on the brightness correction data.

[0014] In the above-mentioned brightness correction method, the calculation of the brightness correction data of the part of the liquid crystal display panel corresponding to the pillar based on the color data includes: calculating the brightness correction data of the liquid crystal display panel corresponding to the circular area defined by the center point of the top surface of the pillar and the preset radius by interpolation method based on the color data.

[0015] In the above brightness correction method, the memory stores address data of multiple pixels of the liquid crystal display panel corresponding to the circular area; the method also includes: correcting the brightness of the multiple pixels of the liquid crystal display panel corresponding to the circular area according to the brightness correction data and the address data.

[0016] In the above brightness correction method, the camera module includes three cameras, and the three cameras are respectively configured with a red filter, a green filter, and a blue filter. The lens of the camera has a predetermined distance from the surface of the pillar, or the horizontal distance between the lens of the camera and the central axis of the pillar is less than or equal to 5 times the diameter of the bottom surface of the pillar; the brightness correction data of the portion of the liquid crystal display panel corresponding to the pillar according to the color data is calculated, which includes: obtaining the first color data r0, the second color data g0, and the third color data b0 of the light passing through the pillar photographed by the three cameras of the camera module at a first moment, and the fourth color data r1, the fifth color data g1, and the sixth color data b1 of the light passing through the pillar photographed by the three cameras of the camera module at a second moment after the first moment; and calculating the brightness difference values ​​ΔLv_r, ΔLv_g, and ΔLv_b according to formula (1), formula (2), and formula (3): ΔLv_r = r1-r0 (1); ΔLv_g = g1-g0 (2); ΔLv_b = b1-b0 (3); Calculate the brightness correction data ΔR, ΔG, and ΔB according to formula (4), formula (5), and formula (6): ΔR = ΔLv_r / k (4); ΔG = ΔLv_g / k (5); ΔB = ΔLv_b / k (6); where k is a preset coefficient.

[0017] The present application sets up multiple camera modules near the pillars of the backlight module of the liquid crystal display panel, so as to accurately capture the changes in the optical characteristics of the pillars, thereby being able to detect the aging of the pillars in a timely manner. In addition, the present application processes the color data obtained by the camera module through a data processor and calculates the corresponding brightness correction data. The control chip reads and applies these brightness correction data to achieve accurate correction of the brightness of the corresponding parts of the liquid crystal display panel and the pillars. By dynamically adjusting the brightness of the corresponding parts of the liquid crystal display panel and the pillars, the local image quality abnormality problem (uneven brightness) caused by the aging of the pillars is effectively improved, and the overall image quality performance of the LCD display is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of a display device provided in an embodiment of the present application.

[0019] Figure 2 yes Figure 1 The liquid crystal display panel of the display device shown corresponds to a schematic diagram of a circular area defined by the center point of the top surface of the pillar and a preset radius.

[0020] Figure 3 4 is a flow chart of a brightness correction method for a display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] The specific implementation methods of this application are described in detail below with reference to the accompanying drawings.

[0022] The terms "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different technical features. The term "plurality" and similar words mean two or more, unless otherwise expressly limited.

[0023] like Figure 1 and Figure 2 As shown, the display device provided by the embodiment of the present application includes a liquid crystal display panel 120 , a backlight module 110 , multiple camera modules 160 , a data processor 130 , a memory 140 and a control chip 150 .

[0024] The liquid crystal display panel 120 is used to display images and can be an IPS, VA, or TN liquid crystal display panel.

[0025] The backlight module 110 is connected to the liquid crystal display panel 120. The backlight module 110 includes multiple light boards 111, multiple pillars 113 and an optical film 112. The light board 111 adopts Mini LED technology, which can achieve partition control to improve display contrast. The Mini LED light board 111 in the backlight module 110 can adopt COB (Chip On Board) packaging technology, and each partition contains hundreds of mini LED chips to achieve local dimming control. The pillars 113 are arranged between the optical film 112 and the light board 111 to support the optical film 112. The number of pillars 113 can be 16, evenly distributed in the backlight module 110. The pillars 113 can be made of transparent or translucent polycarbonate material with a diameter of approximately 0.5-1mm and a height of approximately 3-5mm to ensure sufficient support strength and minimum shading area. The optical film 112 may include a diffuser, a prism, etc., to optimize light distribution and improve light efficiency.

[0026] Multiple camera modules 160 are disposed within the backlight module 110, with the cameras positioned near the pillars 113. These camera modules 160 are used to capture color data of light transmitted through the pillars 113. Each camera module 160 includes three cameras: a red camera, a green camera, and a blue camera. These three cameras are equipped with red, green, and blue filters, respectively. Of course, the number of cameras included in each camera module 160 is not limited. For example, each camera module 160 may include only one camera, or two, four, or the like. These cameras are used to capture color data of light transmitted through the pillars 113. A camera module 160 is positioned near each pillar 113, for a total of 16 camera modules 160. Each camera in the camera modules 160 can be, for example, a CMOS sensor with a pixel resolution of 2 million. The center wavelengths of the filters correspond to the three primary colors of red, green, and blue, respectively, with a full width at half maximum (FWHM) of approximately 20 nm to ensure high color resolution.

[0027] The camera being disposed near the support 113 means that the camera lens is spaced a predetermined distance from the support surface, or that the camera of the camera module 160 is arranged in a direction perpendicular to the plane of the light panel, and the horizontal distance between the camera lens and the central axis of the support 113 is less than or equal to 5 times the diameter of the bottom surface of the support 113. For example, the horizontal distance is 0.5 times, 1 times, 1.5 times, 1.7 times, 2.1 times, 2.4 times, 2.8 times, 3 times, 3.3 times, 3.7 times, 4.1 times, 4.5 times, 4.7 times, or 5 times the diameter of the bottom surface of the support 113. The camera lens being spaced a predetermined distance from the support surface means that the camera lens is parallel to the support surface (e.g., the side surface), and the camera lens (mirror) maintains a predetermined distance (a certain distance) from the support surface. The predetermined distance is within a range of 0 mm to 10 mm, for example, 0 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm.

[0028] The data processor 130 is electrically connected to the camera module 160 and the memory 140. The data processor 130 is used to process the color data of the light transmitted through the pillar 113, acquired by the camera module 160, and calculate brightness correction data for the corresponding portions of the liquid crystal display panel 120 and the pillar 113 based on the color data. In one embodiment, the data processor 130 may be a dedicated image processing chip or an FPGA. The data processor 130 may integrate code for image processing algorithms such as noise suppression, color correction, and brightness mapping to perform noise suppression, color correction, and brightness mapping on the color data. The data processor 130 may also control the three cameras to perform adaptive exposure, that is, automatically adjust the camera exposure parameters based on the ambient light intensity to make the collected color data more accurate. During the calculation of the brightness correction data, the data processor 130 may use a time smoothing algorithm to calculate the brightness correction data to avoid screen flickering caused by instantaneous changes in ambient light. The exposure time of the three cameras in the camera module 160 is consistent.

[0029] The memory 140 is used to store brightness correction data. In one embodiment, the memory 140 can be an EEPROM or a FLASH memory.

[0030] The control chip 150 is electrically connected to the memory 140 and the liquid crystal display panel 120. It is configured to read brightness correction data from the memory 140 and correct the brightness of the portions of the liquid crystal display panel 120 corresponding to the pillars 113 based on the brightness correction data. In one embodiment, the control chip 150 may be a timing driver chip. When performing brightness correction, the control chip 150 may employ a linear interpolation algorithm to ensure a smooth transition of the correction effect within the area affected by the pillars 113, avoiding noticeable brightness jumps. Furthermore, the control chip 150 can dynamically adjust the correction intensity based on the characteristics of the displayed content (such as brightness and color distribution) to achieve a balance between image quality improvement and energy consumption control.

[0031] For example, a Gaussian distribution function can be used to define the weight values, where the weight at the center of the circle is the largest and gradually decreases outward. Through this technical solution, the actual optical impact of the pillar 113 on the surrounding area can be better simulated.

[0032] Memory 140 is further configured to store color data acquired at different times. Data processor 130 is configured to predict the speed and extent of aging of support 113 based on the multiple historical color data stored in memory 140. Specifically, data processor 130 is configured to analyze color data at multiple times, establish a dynamic model of support 113 aging, predict the future aging trend of support 113 based on this model, and calculate brightness correction data based on this aging trend.

[0033] In an embodiment of the present application, the data processor 130 is further configured to calculate, based on the color data, brightness correction data for the liquid crystal display panel 120 corresponding to a circular area defined by the center point p of the top surface of the pillar 113 and a preset radius r. The preset radius r can be determined based on the actual size and range of influence of the pillar 113, and can be set, for example, to 1.5 times the average radius of the cross section of the pillar 113. The data processor 130 is configured to calculate, based on the color data, a first brightness change value for the center point of the portion of the liquid crystal display panel 120 corresponding to the pillar 113, calculate first brightness correction data for the center point of the portion of the liquid crystal display panel 120 corresponding to the pillar 113 based on the first brightness change value, calculate a second brightness change value for the edge of a circle having a radius of the preset radius r, calculate second brightness correction data for the edge based on the second brightness change value, and then calculate brightness correction data for the portion between the center point and the edge using a linear interpolation method based on the first brightness correction data for the center point and the second brightness correction data for the edge.

[0034] The data processor 130 can also calculate the brightness correction data from the center point p to the edge of the circular area by interpolation to achieve a smoother brightness transition. The interpolation method can be linear interpolation or a higher-order interpolation method, such as quadratic interpolation or cubic spline interpolation.

[0035] Specifically, the data processor 130 first divides the circular area into a plurality of concentric rings, each ring representing a different brightness correction level. Then, a different interpolation method is used for each ring:

[0036] 1. For the inner circle area near the center point p (where brightness varies significantly), use cubic spline interpolation. This method ensures a smooth curve while better fitting the nonlinear characteristics of brightness changes.

[0037] 2. For the middle area (the area where the brightness changes relatively slowly), the quadratic interpolation method is used.

[0038] 3. For the outer circular area close to the edge, linear interpolation is used.

[0039] In addition, for image areas with high contrast, the density of interpolation points can be increased; while for areas with low contrast, the density of interpolation points can be appropriately reduced.

[0040] This application calculates the brightness correction data of the circular area defined by the center point p of the top surface of the pillar 113 and the preset radius r, and uses the interpolation method to calculate the correction data from the center point p to the edge of the circular area, which can make the image correction more natural and smooth.

[0041] Of course, data processor 130 can also use a weighted average method to calculate brightness correction data. In this method, each pixel within the circular area is assigned a weight value, which decreases as the distance from the pixel to the center point p increases. This can more accurately reflect the impact of pillar 113 on the surrounding area.

[0042] The memory 140 is further configured to store address data of the plurality of pixels corresponding to the circular area of ​​the LCD panel 120. The control chip 150 is configured to correct the brightness of the plurality of pixels corresponding to the circular area of ​​the LCD panel 120 according to the brightness correction data and the address data.

[0043] In an embodiment of the present application, in addition to storing brightness correction data and address data, the memory 140 can also store multiple sets of preset compensation modes. These compensation modes are pre-set according to different usage scenarios, ambient light conditions, and display content types. When performing brightness correction, the control chip 150 selects a compensation mode based on the current display state and environmental parameters of the liquid crystal display panel 120. Then, in combination with the brightness correction data and address data stored in the memory 140, the brightness of each pixel in the circular area is adjusted. In particular, the control chip 150 uses a parallel processing algorithm to perform brightness correction calculations on multiple pixels at the same time.

[0044] In an embodiment of the present application, the data processor 130 is configured to obtain first color data r0, second color data g0, and third color data b0 of light transmitted through the support 113 captured at a first moment by the three cameras of the camera module 160, as well as fourth color data r1, fifth color data g1, and sixth color data b1 captured at a second moment. The first moment may be when the display device is shipped from the factory, and the second moment may be after a period of use.

[0045] The data processor 130 is used to calculate the brightness difference value and the brightness correction data according to the following formula:

[0046] ΔLv_r = r1 - r0

[0047] ΔLv_g = g1 - g0

[0048] ΔLv_b = b1 - b0

[0049] ΔR = ΔLv_r / k

[0050] ΔG = ΔLv_g / k

[0051] ΔB = ΔLv_b / k

[0052] Among them, k is a preset coefficient, and the value range of the preset coefficient k is 0.3 to 5. Specifically, the value of k is: 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5, in particular, k is 1.2.

[0053] The data processor 130 may use a weighted average method to calculate the brightness difference value. For example, a higher weight may be given to the data at the most recent time point, while a lower weight may be given to the data at the earlier time point.

[0054] To further improve the correction effect, the data processor 130 can dynamically adjust the preset coefficient k. For example, for high-brightness areas, the k value can be appropriately reduced to avoid overcompensation; and for low-brightness areas, the k value can be appropriately increased to enhance detail.

[0055] In an embodiment of the present application, the memory 140 is also used to store color data captured by the camera module 160 at different times. For example, the memory 140 is also used to store the first color data r0, the second color data g0, and the third color data b0 of the light passing through the pillar 113 captured by the three cameras of the camera module 160 at the first moment, and the fourth color data r1, the fifth color data g1, and the sixth color data b1 of the light passing through the pillar 113 captured by the three cameras of the camera module 160 at the second moment. The data processor 130 can read these data from the memory 140 and calculate the brightness difference value and the brightness correction data. For example, the data processor 130 is used to read the first color data r0, the second color data g0, the third color data b0, the fourth color data r1, the fifth color data g1 and the sixth color data b1 from the memory 140, and is used to calculate the brightness difference values ​​ΔLv_r, ΔLv_g and ΔLv_b according to formula (1), formula (2) and formula (3), and is used to calculate the brightness correction data ΔR, ΔG and ΔB according to formula (4), formula (5) and formula (6).

[0056] The display device of the present application sets a camera module 160 near the pillar 113 to monitor the changes in the optical characteristics of the pillar 113 area in real time, and through the cooperation of the data processor 130, the memory 140 and the control chip 150, realizes dynamic correction of the image quality of the pillar 113 area, effectively improves the local image quality abnormality problem caused by the aging of the pillar 113, and improves the overall image quality performance of the display device.

[0057] like Figure 3 As shown, an embodiment of the present application further provides a brightness correction method for a display device, comprising:

[0058] Step 301: Use multiple camera modules 160 to capture the color data of light passing through the pillar 113. Each camera module 160 includes three cameras, and the three cameras are respectively configured with a red filter, a green filter, and a blue filter. The pillar 113 is set between the optical film 112 and the light board 111 of the backlight module 110 of the display device. The three cameras of each camera module 160 are set in the backlight module 110 and are located near the pillar 113.

[0059] Step 302 : Calculate brightness correction data of the portion of the LCD panel 120 corresponding to the pillar 113 based on the color data.

[0060] Step 303 : Store the brightness correction data in the memory 140 .

[0061] Step 304 : Read the brightness correction data from the memory 140 .

[0062] Step 305 : Correct the brightness of the portion of the LCD panel 120 corresponding to the pillar 113 according to the brightness correction data.

[0063] Step 302 includes:

[0064] Brightness correction data of the LCD panel 120 corresponding to a circular area defined by the center point p of the top surface of the pillar 113 and a preset radius r is calculated based on the color data. The preset radius r is 1.5 times the average radius of the cross section of the pillar 113.

[0065] The calculation of brightness correction data of the liquid crystal display panel 120 corresponding to a circular area defined by the center point p of the top surface of the support 113 and the preset radius r according to the color data includes:

[0066] The brightness correction data from the center point p to the edge of the circular area is calculated by interpolation, where the interpolation method is one of linear interpolation, quadratic interpolation, or cubic spline interpolation.

[0067] The data processor 130 is also used to divide the circular area into multiple levels and use different interpolation methods for different areas. The inner circular area close to the center point p uses cubic spline interpolation, the middle area uses quadratic interpolation, and the outer circular area close to the edge uses linear interpolation.

[0068] This application calculates the brightness correction data of the circular area defined by the center point p of the top surface of the pillar 113 and the preset radius r, and uses the interpolation method to calculate the correction data from the center point p to the edge of the circular area, which can make the image correction more natural and smooth.

[0069] The memory 140 stores address data of a plurality of pixels corresponding to a circular area of ​​the liquid crystal display panel 120 .

[0070] The method further comprises:

[0071] The brightness of the plurality of pixels corresponding to the circular area of ​​the liquid crystal display panel 120 is corrected according to the brightness correction data and the address data.

[0072] Step 302 includes:

[0073] Obtain first color data r0, second color data g0, and third color data b0 of light transmitted through pillar 113 captured by the three cameras of camera module 160 at a first moment, and fourth color data r1, fifth color data g1, and sixth color data b1 of light transmitted through pillar 113 captured by the three cameras of camera module 160 at a second moment after the first moment. The first moment is when the display device is shipped from the factory, and the second moment is when the display device has been used for a period of time.

[0074] Calculate the brightness difference values ​​ΔLv_r, ΔLv_g, and ΔLv_b according to formula (1), formula (2), and formula (3):

[0075] ΔLv_r = r1-r0 (1)

[0076] ΔLv_g = g1-g0 (2)

[0077] ΔLv_b = b1-b0 (3)

[0078] Calculate the brightness correction data ΔR, ΔG, and ΔB according to formula (4), formula (5), and formula (6):

[0079] ΔR=ΔLv_r / k (4)

[0080] ΔG=ΔLv_g / k (5)

[0081] ΔB=ΔLv_b / k (6)

[0082] Wherein, k is a preset coefficient. The preset coefficient k ranges from 0.3 to 5. Specifically, the values ​​of k are: 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5. In particular, k is 1.2.

[0083] The data processor 130 is further configured to calculate the brightness difference value using a weighted average method based on the color data at multiple time points, wherein the data at the most recent time point has a higher weight and the data at an earlier time point has a lower weight.

[0084] The data processor 130 is further configured to dynamically adjust the preset coefficient k according to characteristics of the display content, wherein for a high-brightness area, the data processor 130 reduces the k value, and for a dark area, the data processor 130 increases the k value.

[0085] The memory 140 is further used to store multiple sets of preset compensation modes. The control chip 150 is further used to select a compensation mode according to the current display state and environmental parameters, and perform brightness correction on the liquid crystal display panel 120 according to the compensation mode and brightness correction data.

[0086] The data processor 130 is further configured to calculate brightness correction data using a nonlinear mapping function, where the nonlinear mapping function is a logarithmic function or a power function.

[0087] This application disposes multiple camera modules 160 near the pillars 113 of the display device's backlight module 110. Each camera module includes three cameras equipped with red, green, and blue filters, respectively. These cameras are used to detect color changes in light passing through the pillars 113, thereby determining the aging status (brightness changes) of the pillars 113. A data processor 130 processes the acquired change data into brightness correction data for the liquid crystal display panel 120 and stores the brightness correction data in a memory 140. This compensates for regional image quality abnormalities (primarily in the pillar 113 area) caused by aging of the pillars 113. Therefore, this application can improve the overall image quality of the liquid crystal display panel 120.

[0088] The display device of the present application includes a liquid crystal display panel 120 , a backlight module 110 , a plurality of camera modules 160 , a data processor 130 , a memory 140 and a control chip 150 .

[0089] The backlight module 110 includes multiple light panels 111, multiple pillars 113, and an optical film 112. A camera module 160 is positioned near each pillar 113. Each camera module includes three cameras, each equipped with red, green, and blue filters, to detect color changes in the pillars 113. Changes in the color or brightness of a pillar 113 will cause changes in the data and numerical ratios of the corresponding camera modules 160. For example, in the initial normal state, the data captured by the three cameras is r0:g0:b0. After the pillar 113 ages, the data captured by the three cameras changes to r1:g1:b1. Therefore, r1:r0, g1:g0, and b1:b0 represent brightness changes, while changes in the ratios between the three cameras represent color changes. If the initial r0:g0:b0 ratio is 1:1:1, and the ratio changes to r1:g1:b1:1, this indicates that the color of the pillar 113 has shifted toward yellow after aging.

[0090] The data processor 130 is electrically connected to the camera module 160 and the LCD panel 120. It processes the brightness signal acquired by the camera module 160 and calculates brightness correction data for the portion of the LCD panel 120 corresponding to the pillars 113. The data processor 130 contains computational logic code that configures the storage and compensation methods for the physical locations of the LCD panel 120 pixels corresponding to the pillars 113. The memory 140 stores the brightness correction data calculated by the data processor 130 for access by the control chip 150.

[0091] About the calculation of brightness correction data (taking one pillar 113 as an example):

[0092] Step 1: Preset the coordinates (x, y) of the center point p of the portion of the LCD panel 120 corresponding to the support 113 and the influence radius r, and store the data in the memory 140 .

[0093] Step 2: The data processor 130 selects the initial state data stored in the memory 140 as a reference. The initial state data stored in the memory 140 includes the brightness values ​​(r0, g0, b0) of the three cameras.

[0094] Step 3: Assume that after a period of time, the data captured by the three cameras changes to r1, g1, and b1. Data processor 130 generates a set of brightness correction data based on the center position and radius r set in Step 1. Interpolation is performed from the center point p to the boundary of the circular area using linear interpolation or other interpolation methods. The camera exposure time remains consistent throughout.

[0095] Step 4: The data processor 130 writes the calculated brightness correction data into the memory 140 .

[0096] Specific calculation of brightness correction data:

[0097] Given the initial data r0, g0, b0 and the modified data r1, g1, b1, the brightness difference values ​​ΔLv_r = r1-r0, ΔLv_g = g1-g0, and ΔLv_b = b1-b0 are calculated. The brightness difference values ​​are then mapped to the corrected data ΔR, ΔG, and ΔB that control the brightness.

[0098] Through testing, we can know the relationship between the numerical change of brightness control and brightness, and the simplified calculation is Lv = k*reg, where reg includes ΔR, ΔG, and ΔB.

[0099] Therefore, ΔR, ΔG, and ΔB are calculated as ΔLv_r / k, ΔLv_g / k, and ΔLv_b / k. The k in the formula is obtained by fitting a series of experimental data, such as fitting a linear multivariate function and a piecewise function.

[0100] Through the above technical solution, the present application can improve the image quality consistency of the liquid crystal display panel 120 using Mini LED backlight technology.

[0101] The above is a detailed introduction to the embodiments of the present application. The contents of this specification should not be understood as limiting the scope of protection of the present application.

Claims

1. A display device, characterized in that: The display device includes: Liquid crystal display panels; A backlight module connected to the liquid crystal display panel, the backlight module comprising a plurality of light panels, a plurality of pillars and an optical film, wherein the pillars are arranged between the optical film and the light panels; a camera module, disposed in the backlight module, and configured to capture color data of light passing through the pillar; a data processor, configured to process color data of light transmitted through the pillar acquired by the camera module, and calculate brightness correction data of a portion of the liquid crystal display panel corresponding to the pillar based on the color data; a memory for storing the brightness correction data; and a control chip, configured to read the brightness correction data from the memory and correct the brightness of a portion of the liquid crystal display panel corresponding to the pillar according to the brightness correction data; The data processor is used to obtain first color data r0, second color data g0, and third color data b0 of the light passing through the pillar captured by the three cameras of the camera module at a first moment, and is used to obtain fourth color data r1, fifth color data g1, and sixth color data b1 of the light passing through the pillar captured by the three cameras of the camera module at a second moment after the first moment, and is used to calculate brightness difference values ​​ΔLv_r, ΔLv_g, and ΔLv_b according to formula (1), formula (2), and formula (3): ΔLv_r = r1-r0 (1); ΔLv_g = g1-g0 (2); ΔLv_b = b1-b0 (3); The data processor is further configured to calculate the brightness correction data ΔR, ΔG, and ΔB according to formula (4), formula (5), and formula (6): ΔR=ΔLv_r / k (4); ΔG=ΔLv_g / k (5); ΔB=ΔLv_b / k (6); Wherein, k is a preset coefficient.

2. The display device according to claim 1, wherein The data processor is further configured to calculate, based on the color data, the brightness correction data of the liquid crystal display panel corresponding to a circular area defined by a center point of the top surface of the pillar and a preset radius.

3. The display device according to claim 2, wherein The data processor is further configured to calculate the brightness correction data from the center point to the edge of the circular area by interpolation.

4. The display device according to claim 2, wherein The memory is further configured to store address data of a plurality of pixels of the liquid crystal display panel corresponding to the circular area; The control chip is used to correct the brightness of the plurality of pixels of the liquid crystal display panel corresponding to the circular area according to the brightness correction data and the address data.

5. The display device according to claim 1, wherein The camera module includes three cameras, which are respectively configured with a red filter, a green filter, and a blue filter. The lenses of the cameras are spaced a predetermined distance from the surface of the pillar, or the horizontal distance between the lenses of the cameras and the central axis of the pillar is less than or equal to 5 times the diameter of the bottom surface of the pillar.

6. A brightness correction method for a display device, characterized in that: include: capturing color data of light passing through a pillar using a camera module, wherein the pillar is disposed between an optical film and a light board of a backlight module of the display device, and the camera module is disposed within the backlight module; Calculating brightness correction data of a portion of the liquid crystal display panel corresponding to the pillar based on the color data; storing the brightness correction data in a memory; reading the brightness correction data from the memory; The brightness of the portion of the liquid crystal display panel corresponding to the pillar is corrected according to the brightness correction data.

7. The brightness correction method of a display device according to claim 6, wherein: The step of calculating brightness correction data of a portion of the liquid crystal display panel corresponding to the pillar according to the color data includes: The brightness correction data of the liquid crystal display panel corresponding to a circular area defined by a center point of the top surface of the pillar and a preset radius is calculated by interpolation according to the color data.

8. The brightness correction method of a display device according to claim 7, wherein: The memory stores address data of a plurality of pixels of the liquid crystal display panel corresponding to the circular area; The method further comprises: The brightness of the plurality of pixels of the liquid crystal display panel corresponding to the circular area is corrected according to the brightness correction data and the address data.

9. The brightness correction method of a display device according to claim 6, wherein: The camera module includes three cameras, each of which is configured with a red filter, a green filter, and a blue filter. A predetermined distance is formed between the camera lens and the surface of the pillar, or a horizontal distance between the camera lens and the central axis of the pillar is less than or equal to 5 times the diameter of the bottom surface of the pillar. The step of calculating brightness correction data of a portion of the liquid crystal display panel corresponding to the pillar according to the color data includes: Obtain first color data r0, second color data g0, and third color data b0 of light passing through the pillar captured by the three cameras of the camera module at a first moment, and fourth color data r1, fifth color data g1, and sixth color data b1 of light passing through the pillar captured by the three cameras of the camera module at a second moment after the first moment; Calculate the brightness difference values ​​ΔLv_r, ΔLv_g, and ΔLv_b according to formula (1), formula (2), and formula (3): ΔLv_r = r1-r0 (1); ΔLv_g = g1-g0 (2); ΔLv_b = b1-b0 (3); The brightness correction data ΔR, ΔG, and ΔB are calculated according to formula (4), formula (5), and formula (6): ΔR=ΔLv_r / k (4); ΔG=ΔLv_g / k (5); ΔB=ΔLv_b / k (6); Wherein, k is a preset coefficient.

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