Display module, its manufacturing method and manufacturing equipment

Abstract

This invention provides a display module and its fabrication method and apparatus. The fabrication method includes: fabricating a backlight module and a liquid crystal panel; further including: detecting the flatness of the liquid crystal panel and obtaining its flatness information; detecting the flatness of the backlight module and obtaining its flatness information; determining whether the backlight module needs flatness compensation based on the flatness information of the liquid crystal panel and the backlight module, and calculating the location and compensation value of the location requiring flatness compensation; if so, performing flatness compensation on the location of the backlight module requiring flatness compensation; if not, aligning the backlight module and the liquid crystal panel to form the display module. This fabrication method enables targeted compensation of the flatness at different locations of the backlight module, thereby ensuring that the outlines of the aligned backlight module and the liquid crystal panel are consistent, thus preventing edge light leakage in the display module due to distortion and deformation of the liquid crystal panel.

Description

Technical Field

[0001] This invention belongs to the field of display technology, specifically relating to a display module and its manufacturing method and equipment. Background Technology

[0002] High-end LCD display modules have extremely high requirements for screen brightness uniformity. An LCD display module is formed by bonding a backlight module and liquid crystal glass. The liquid crystal glass is formed by bonding an array substrate and a cell substrate together and filling the gap between the cells with liquid crystal. The backlight module provides display backlight for the liquid crystal glass.

[0003] Due to the need for thinner and lighter designs, the strength of existing LCD glass cannot be increased. After the LCD glass and backlight module are assembled, the LCD glass is continuously affected by the contour of the backlight module. When the contours of the backlight module and the LCD glass differ too much, the LCD glass will be subjected to huge internal stress. This internal stress causes the LCD glass to twist and deform, resulting in the liquid crystal shifting within the LCD glass and causing light leakage.

[0004] Currently, light leakage is the primary major defect in LCD display module products, and the repair cost is high. Summary of the Invention

[0005] This invention addresses the problem of excessive contour differences between the backlight module and the liquid crystal glass due to flatness variations, which leads to edge light leakage in the liquid crystal display module. It provides a display module, its fabrication method, and fabrication equipment. The fabrication method of this display module can achieve targeted compensation for the flatness of different positions of the backlight module, thereby ensuring that the contours of the mated backlight module and the liquid crystal panel are consistent. This eliminates the internal stress on the liquid crystal panel during mating, thus preventing edge light leakage caused by distortion of the liquid crystal panel and improving the display quality of the display module.

[0006] This invention provides a method for manufacturing a display module, comprising: manufacturing a backlight module and a liquid crystal panel.

[0007] It also includes: detecting the flatness of the liquid crystal panel and obtaining the flatness information of the liquid crystal panel;

[0008] Detect the flatness of the backlight module and obtain the flatness information of the backlight module;

[0009] Based on the flatness information of the liquid crystal panel and the flatness information of the backlight module, it is determined whether the backlight module needs flatness compensation, and the position and compensation value of the backlight module that need flatness compensation are calculated.

[0010] If so, then flatness compensation is performed on the positions of the backlight module that require flatness compensation; if not, then the backlight module and the liquid crystal panel are aligned to form the display module.

[0011] In some embodiments, the liquid crystal panel has a peripheral area and a central area, the peripheral area surrounding the central area, the peripheral area being divided into m first sub-regions, and the central area being divided into n second sub-regions.

[0012] The step of detecting the flatness of the liquid crystal panel and obtaining the flatness information of the liquid crystal panel includes:

[0013] Detect the flatness of each first sub-region and each second sub-region;

[0014] Calculate the average flatness of m first sub-regions and n second sub-regions based on the flatness of each first sub-region and each second sub-region to obtain the first flatness average;

[0015] Calculate the difference between the flatness of each of the first sub-regions and the mean of the first flatness to obtain the first difference;

[0016] Calculate the mean of the first differences among m of the first sub-regions based on the first difference;

[0017] Calculate the difference between the first difference and the mean of the first differences for each of the first sub-regions to obtain the second difference.

[0018] In some embodiments, the backlight module has a periphery region and a central region. The periphery region surrounds the central region. The periphery region of the backlight module is divided into m third sub-regions. The m third sub-regions correspond one-to-one with the m first sub-regions, and the orthographic projections of the corresponding third sub-regions and the first sub-regions on their respective planes coincide.

[0019] The step of detecting the flatness of the backlight module and obtaining the flatness information of the backlight module includes: detecting the flatness of each of the third sub-regions;

[0020] Calculate the average flatness of m third sub-regions based on the flatness of each third sub-region to obtain the second average flatness;

[0021] Calculate the difference between the flatness of each of the third sub-regions and the average flatness of the second sub-region to obtain the third difference.

[0022] In some embodiments, determining whether the backlight module needs flatness compensation based on the flatness information of the liquid crystal panel and the flatness information of the backlight module, and calculating the location and compensation value of the backlight module requiring flatness compensation, includes:

[0023] Calculate the difference between the second difference and the third difference between the first sub-region and the third sub-region corresponding to each group to obtain the fourth difference;

[0024] Determine whether the absolute value of the fourth difference is greater than a set value;

[0025] If yes, then it is determined that the third sub-region of the backlight module needs to be flattened, and the fourth difference is the compensation value; if no, then it is determined that the third sub-region of the backlight module does not need to be flattened.

[0026] In some embodiments, a flatness compensation device is used to perform flatness compensation on the third sub-region of the backlight module.

[0027] The flatness compensation device includes m movable blocks, each of which corresponds one-to-one with one of the m third sub-regions, and the orthographic projections of the corresponding movable blocks and the third sub-regions on their respective planes coincide.

[0028] When the absolute value of the fourth difference is greater than the set value, the flatness compensation device is activated, and the movable block moves up or down along the first direction, causing the third sub-region corresponding to the movable block to move up or down by the compensation value distance along the first direction.

[0029] The first direction is a direction perpendicular to the plane where the backlight module and the liquid crystal panel are located.

[0030] In some embodiments, the movable block has a hole, through which the movable block performs vacuum adsorption on the third sub-region.

[0031] In some embodiments, the m first sub-regions are of the same size and shape;

[0032] n second sub-regions are of the same size and shape;

[0033] Alternatively, the m first sub-regions and the n second sub-regions are of the same size and shape.

[0034] In some embodiments, m ≥ 4, and m is an integer.

[0035] In some embodiments, the set value ranges from 0.2 to 0.3 mm.

[0036] The present invention also provides a display module manufacturing apparatus, comprising: a flatness detection device configured to detect flatness information of a liquid crystal panel and a backlight module;

[0037] The processing module, electrically connected to the flatness detection device, is configured to determine whether the backlight module needs flatness compensation based on the flatness information of the liquid crystal panel and the flatness information of the backlight module, and to calculate the position and compensation value of the backlight module that needs flatness compensation.

[0038] A flatness compensation device, electrically connected to the processing module, is configured to perform flatness compensation on the positions of the backlight module that require flatness compensation.

[0039] The mating device, electrically connected to the flatness compensation device, is configured to mate the liquid crystal panel and the backlight module passing through the flatness compensation device to form the display module.

[0040] In some embodiments, the liquid crystal panel has a periphery region and a central region, the periphery region surrounds the central region, the periphery region of the liquid crystal panel is divided into m first sub-regions, and the central region of the liquid crystal panel is divided into n second sub-regions.

[0041] The backlight module has a four-sided edge area and a central area. The four-sided edge area surrounds the periphery of the central area. The four-sided edge area of ​​the backlight module is divided into m third sub-areas. The m third sub-areas correspond one-to-one with the m first sub-areas, and the orthographic projections of the corresponding third sub-areas and the first sub-areas on their respective planes coincide.

[0042] The flatness detection device is configured to detect the flatness of each of the first sub-regions and each of the second sub-regions; and to detect the flatness of each of the third sub-regions;

[0043] The processing module is configured to calculate the average flatness of m first sub-regions and n second sub-regions based on the flatness of each first sub-region and the flatness of each second sub-region, to obtain the first average flatness value;

[0044] Calculate the difference between the flatness of each of the first sub-regions and the mean of the first flatness to obtain the first difference;

[0045] Calculate the mean of the first differences among m of the first sub-regions based on the first difference;

[0046] Calculate the difference between the first difference and the mean of the first differences for each of the first sub-regions to obtain the second difference;

[0047] Calculate the average flatness of m third sub-regions based on the flatness of each third sub-region to obtain the second average flatness;

[0048] Calculate the difference between the flatness of each of the third sub-regions and the average flatness of the second region to obtain the third difference;

[0049] Calculate the difference between the second difference and the third difference between the first sub-region and the third sub-region corresponding to each group to obtain the fourth difference;

[0050] Determine whether the absolute value of the fourth difference is greater than a set value;

[0051] If the determination result is yes, it is determined that the third sub-region of the backlight module needs to be flattened, and the fourth difference is the compensation value; if the determination result is no, it is determined that the third sub-region of the backlight module does not need to be flattened.

[0052] In some embodiments, the flatness compensation device includes m active blocks, the m active blocks being configured to correspond one-to-one with the m third sub-regions, and the orthographic projections of the corresponding active blocks and the third sub-regions on their respective planes coincide.

[0053] The m movable blocks can move up and down along a direction perpendicular to the plane where the backlight module and the liquid crystal panel are located, respectively, to compensate for the flatness of each of the third sub-regions of the backlight module.

[0054] In some embodiments, the flatness compensation device further includes a vacuum pumping device.

[0055] Each of the movable blocks has a hole in the central region of the side that contacts the backlight module, and the hole is connected to the vacuum pumping device.

[0056] In some embodiments, the material of the active block includes silicone.

[0057] The present invention also provides a display module, which is prepared by the above-described preparation method.

[0058] The beneficial effects of the present invention are as follows: The method for manufacturing a display module provided by the present invention detects the flatness of the liquid crystal panel and the backlight module before assembly, and determines whether the backlight module needs flatness compensation based on the flatness of the liquid crystal panel and the backlight module. It calculates the position and compensation value of the backlight module that needs flatness compensation, and performs flatness compensation at the position of the backlight module that needs flatness compensation when it is determined that the backlight module needs flatness compensation. This enables targeted compensation of the flatness of different positions of the backlight module, thereby making the contours of the assembled backlight module and the liquid crystal panel consistent, eliminating the internal stress on the liquid crystal panel under the assembly state, and thus avoiding the distortion and deformation of the liquid crystal panel that causes edge light leakage in the display module, thereby improving the display quality of the display module.

[0059] The display module manufacturing equipment provided by this invention, by setting up a flatness detection device, a processing module and a flatness compensation device, can achieve targeted compensation for the flatness of different positions of the backlight module, so that the contours of the mated backlight module and the liquid crystal panel are consistent, eliminating the internal stress on the liquid crystal panel under the mating state, thereby avoiding the distortion and deformation of the liquid crystal panel and causing edge light leakage of the display module, and improving the display quality of the display module.

[0060] The display module provided by this invention does not exhibit edge light leakage, thus improving the display quality of the display module. Attached Figure Description

[0061] Figure 1 This is a schematic diagram illustrating light leakage in a display module caused by excessive differences in the outlines of the backlight module and the liquid crystal glass in related technologies.

[0062] Figure 2 This is a flowchart of the manufacturing method of the display module in an embodiment of the present invention;

[0063] Figure 3 This is a schematic diagram of the process structure of the manufacturing method of the display module in an embodiment of the present invention;

[0064] Figure 4 This is a schematic diagram of the area division of the liquid crystal panel in an embodiment of the present invention;

[0065] Figure 5 This is a flowchart illustrating step S102 in the method for preparing the display module according to an embodiment of the present invention.

[0066] Figure 6 This is a schematic diagram of the area division of the backlight module in an embodiment of the present invention;

[0067] Figure 7 This is a flowchart illustrating step S103 in the method for preparing the display module according to an embodiment of the present invention.

[0068] Figure 8 This is a flowchart illustrating step S104 in the method for preparing the display module according to an embodiment of the present invention.

[0069] Figure 9 This is a schematic diagram of the structure of the movable block in the flatness compensation device according to an embodiment of the present invention;

[0070] Figure 10 This is a schematic diagram illustrating the principle of the flatness compensation device for compensating the flatness of the backlight module in an embodiment of the present invention.

[0071] Figure 11 This is a structural principle block diagram of the display module manufacturing equipment in an embodiment of the present invention;

[0072] Figure 12This is a comparison image of the display module before and after the backlight module's flatness compensation in an embodiment of the present invention.

[0073] The reference numerals in the attached figures are:

[0074] 1. Backlight module; 101. Four-sided edge area of ​​the backlight module; 1011. Third sub-area; 102. Middle area of ​​the backlight module; 2. LCD panel; 201. Four-sided edge area of ​​the LCD panel; 2011. First sub-area; 202. Middle area of ​​the LCD panel; 2021. Second sub-area; 3. Flatness detection device; 4. Flatness compensation device; 40. Movable block; 401. Hole; 5. Processing module; 6. Alignment device; 7. LCD glass. Detailed Implementation

[0075] To enable those skilled in the art to better understand the technical solution of the present invention, the following describes in further detail a display module and its preparation method and equipment in conjunction with the accompanying drawings and specific embodiments.

[0076] In related technologies, such as Figure 1 As shown, the thickness of the liquid crystal glass 7 is only 0.4mm, and its rigidity is relatively poor. Even slight fluctuations in the flatness of the backlight module 1 will affect the liquid crystal glass 7. Currently, due to limitations in material and thickness requirements, the flatness of the backlight module 1 cannot be optimized further, and its original flatness cannot be guaranteed during transportation. This results in a significant difference in the contours of the mated backlight module 1 and the liquid crystal glass 7, causing the liquid crystal glass 7 to be subjected to enormous internal stress. This internal stress causes the liquid crystal glass 7 to twist and deform, leading to light leakage due to liquid crystal displacement within the liquid crystal glass 7. This light leakage occurs in the peripheral areas of the liquid crystal display module, and the light leakage problem is particularly severe under zero grayscale (L0) images.

[0077] Currently, the only way to improve the light leakage problem is to check the uniformity of screen brightness at zero grayscale (L0) and 255 grayscale (L255) after the LCD glass and backlight module are assembled. Then, manual repair or scrapping can be carried out. Repairing defective products is costly and time-consuming, and there is also the possibility of missing detection.

[0078] To address the issue of excessive contour differences between the backlight module and the liquid crystal glass due to flatness variations, which in turn lead to light leakage at the edges of the liquid crystal display module, this invention provides a method for manufacturing a display module, such as... Figure 2 and Figure 3 As shown, the process includes: Step S101: Preparing the backlight module 1 and the liquid crystal panel 2.

[0079] In this step, the liquid crystal panel 2 includes an array substrate and a cell-pairing substrate, with liquid crystal filling the gap between the array substrate and the cell-pairing substrate. The cell-pairing substrate can be a color filter substrate or a cell-pairing substrate without a color filter. The backlight module 1 is located on the side of the array substrate opposite to the cell-pairing substrate and is used to provide backlight for the liquid crystal panel 2 during display.

[0080] In this embodiment, the backlight module 1 and the liquid crystal panel 2 are manufactured using relatively mature traditional processes, which will not be described in detail here.

[0081] It also includes: step S102: detecting the flatness of the liquid crystal panel 2 and obtaining the flatness information of the liquid crystal panel 2.

[0082] In this step, a flatness detection device 3 is used to detect the flatness of the liquid crystal panel 2.

[0083] Step S103: Detect the flatness of the backlight module 1 and obtain the flatness information of the backlight module 1.

[0084] In this step, the flatness of the backlight module 1 is detected by a flatness detection device 3.

[0085] Step S104: Determine whether the backlight module 1 needs flatness compensation based on the flatness information of the LCD panel 2 and the backlight module 1, and calculate the position and compensation value of the backlight module 1 that need flatness compensation.

[0086] If so, proceed to step S105: perform flatness compensation on the positions of the backlight module 1 that require flatness compensation.

[0087] In this step, the flatness compensation range is the compensation value.

[0088] If not, proceed to step S106: align the backlight module 1 and the LCD panel 2 to form a display module.

[0089] The manufacturing method of this display module involves detecting the flatness of the liquid crystal panel and the backlight module before assembly, determining whether the backlight module needs flatness compensation based on the flatness of the liquid crystal panel and the backlight module, calculating the location and compensation value of the backlight module requiring flatness compensation, and performing flatness compensation at the location of the backlight module when it is determined that flatness compensation is required. This enables targeted compensation of the flatness at different locations of the backlight module, thereby ensuring that the contours of the assembled backlight module and the liquid crystal panel are consistent, eliminating the internal stress on the liquid crystal panel under the assembly state, and thus avoiding edge light leakage of the display module caused by the distortion and deformation of the liquid crystal panel, thereby improving the display quality of the display module.

[0090] In some embodiments, such as Figure 4As shown, the liquid crystal panel 2 has a four-sided edge region 201 and a central region 202. The four-sided edge region 201 surrounds the central region 202. The four-sided edge region 201 of the liquid crystal panel 2 is divided into m first sub-regions 2011, and the central region 202 of the liquid crystal panel 2 is divided into n second sub-regions 2021.

[0091] In some embodiments, such as Figure 4 As shown, m first sub-regions 2011 are of the same size and shape; n second sub-regions 2021 are of the same size and shape. In some embodiments, the m first sub-regions 2011 and the n second sub-regions 2021 are of the same size and shape.

[0092] In some embodiments, the size and shape of the m first sub-regions 2011 may also be different; the size and shape of the n second sub-regions 2021 may also be different.

[0093] In some embodiments, m ≥ 4, and m is an integer.

[0094] In some embodiments, such as Figure 4 As shown, the four edges of the liquid crystal panel 2 are divided into 28 first sub-regions 2011, and the center area 202 of the liquid crystal panel 2 is divided into 35 second sub-regions 2021.

[0095] In some embodiments, step S102: detecting the flatness of the liquid crystal panel 2 and obtaining flatness information of the liquid crystal panel 2 includes: such as Figure 5 As shown,

[0096] Step S1021: Detect the flatness of each first sub-region 2011 and each second sub-region 2021;

[0097] In this step, the flatness values ​​of the 28 first sub-regions 2011 and the 35 second sub-regions 2021 are L1, L2, L3, ..., L63, respectively.

[0098] Step S1022: Calculate the average flatness of m first sub-regions 2011 and n second sub-regions 2021 based on the flatness of each first sub-region 2011 and each second sub-region 2021, and obtain the first flatness average.

[0099] In this step, the formula for calculating the first flatness mean Lave is: Lave = SUM(L1:L63) / 63.

[0100] Step S1023: Calculate the difference between the flatness of each first sub-region 2011 and the first flatness mean to obtain the first difference;

[0101] In this step, the formula for calculating the first difference Lci for each first sub-region 2011 is: Lci = Li - Lave (i = 1 to 28).

[0102] Step S1024: Calculate the mean of the first differences of m first sub-regions 2011 based on the first difference;

[0103] In this step, the formula for calculating the first difference mean Lcave is: Lcave = SUM(Lc1:Lc28) / 28.

[0104] Step S1025: Calculate the difference between the first difference and the mean of the first differences for each first sub-region 2011 to obtain the second difference.

[0105] In this step, the formula for calculating the second difference of each first sub-region 2011 is: Lai = Lci - Lcave (i = 1 ~ 28).

[0106] In some embodiments, such as Figure 6 As shown, the backlight module 1 has a four-sided edge region 101 and a middle region 102. The four-sided edge region 101 surrounds the middle region 102. The four-sided edge region 101 of the backlight module 1 is divided into m third sub-regions 1011. The m third sub-regions 1011 correspond one-to-one with the m first sub-regions 2011, and the orthographic projections of the corresponding third sub-regions 1011 and the first sub-regions 2011 on their respective planes coincide.

[0107] In some embodiments, such as Figure 6 As shown, the four edges of the backlight module 1 are divided into 28 third sub-regions 1011.

[0108] In some embodiments, step S103: detecting the flatness of the backlight module and obtaining flatness information of the backlight module includes: such as Figure 7 As shown,

[0109] Step S1031: Detect the flatness of each third sub-region 1011;

[0110] In this step, the flatness values ​​of the 28 third sub-regions 1011 are B1, B2, B3, ..., B28, respectively.

[0111] Step S1032: Calculate the average flatness of m third sub-regions 1011 based on the flatness of each third sub-region 1011 to obtain the second average flatness value;

[0112] In this step, the formula for calculating the second flatness mean Bave is: Bave = SUM(B1:B28) / 28.

[0113] Step S1033: Calculate the difference between the flatness of each third sub-region 1011 and the mean of the second flatness to obtain the third difference.

[0114] In this step, the formula for calculating the third difference Bci of each third sub-region 1011 is: Bci = Bi - Bave (i = 1 ~ 28).

[0115] In some embodiments, step S104: determining whether the backlight module needs flatness compensation based on the flatness information of the liquid crystal panel and the flatness information of the backlight module, and calculating the location and compensation value of the backlight module requiring flatness compensation, including: Figure 8 As shown,

[0116] Step S1041: Calculate the difference between the second and third differences between the first sub-region 2011 and the third sub-region 1011 corresponding to each group to obtain the fourth difference;

[0117] In this step, the formula for calculating the fourth difference Ci between the first sub-region 2011 and the third sub-region 1011 in each group is: Ci = Lai – Bci (i = 1 to 28).

[0118] Step S1042: Determine whether the absolute value of the fourth difference is greater than the set value;

[0119] In this step, the set value ranges from 0.2 to 0.3 mm.

[0120] If yes, then proceed to step S1043: determine that the third sub-region of the backlight module needs to be flattened, and the fourth difference is the compensation value; if no, then proceed to step S1044: determine that the third sub-region of the backlight module does not need to be flattened.

[0121] In some embodiments, such as Figure 9 As shown, a flatness compensation device 4 is used to perform flatness compensation on the third sub-region of the backlight module. The flatness compensation device 4 includes m movable blocks 40, each of which corresponds to one of the m third sub-regions, and the orthographic projection of the corresponding movable block 40 and the third sub-region on their respective planes coincides.

[0122] In some embodiments, such as Figure 10 As shown, when the absolute value of the fourth difference is greater than the set value, the flatness compensation device 4 is activated, and the movable block 40 moves up or down along the first direction Y, causing the third sub-region of the corresponding movable block 40 to move up or down by the compensation value along the first direction Y; the first direction is the direction perpendicular to the plane where the backlight module 1 and the LCD panel 2 are located.

[0123] In some embodiments, such as Figure 9 and Figure 10 As shown, the movable block 40 has a hole 401, through which the movable block 40 performs vacuum adsorption on the third sub-region. The hole 401 in the movable block 40 enables the vacuum adsorption and fixation of the backlight module 1, thereby allowing the movable block 40 to move the third sub-region of the backlight module 1 upwards and downwards, thus achieving the planarization adjustment of the backlight module 1.

[0124] In this embodiment, the principle of flatness compensation for backlight module 1 is as follows: Figure 10 As shown, after detecting and obtaining the flatness information of the LCD panel 2 and the backlight module 1, the flatness compensation device 4 is activated, and the position and compensation value of the backlight module 1 that need flatness compensation are calculated. The vacuum device in the flatness compensation device 4 is activated, and the vacuum adsorption force provided through the hole 401 in the movable block 40 is used to fix the four-sided edge area 101 of the backlight module 1. According to the calculated compensation value, the flatness compensation device 4 activates the movable block 40 at the corresponding position that needs flatness compensation. The movable block 40 drives the position of the backlight module 1 that needs flatness compensation to rise or fall by the compensation value distance. Finally, the backlight module 1 and the LCD panel 2 have the same contour, so that the orthographic projection of the backlight module 1 and the LCD panel 2 on their respective planes coincides during the alignment process. The backlight module 1, after flatness compensation, is joined with the LCD panel 2 to form a display module. Since the backlight module 1 and the LCD panel 2 have the same outline, the LCD panel 2 will not be subjected to internal stress in the joined state, thereby avoiding the edge light leakage problem caused by the mismatch between the outlines of the backlight module 1 and the LCD panel 2 due to the distortion and deformation of the LCD panel 2, and improving the display quality of the display module.

[0125] The method for manufacturing a display module provided in this embodiment of the invention detects the flatness of the liquid crystal panel and the backlight module before assembly, and determines whether the backlight module needs flatness compensation based on the flatness of the liquid crystal panel and the backlight module. It calculates the location and compensation value of the backlight module that needs flatness compensation, and performs flatness compensation at the location of the backlight module that needs flatness compensation when it is determined that the backlight module needs flatness compensation. This enables targeted compensation of the flatness of different positions of the backlight module, thereby making the contours of the assembled backlight module and the liquid crystal panel consistent, eliminating the internal stress on the liquid crystal panel in the assembled state, and thus avoiding the distortion and deformation of the liquid crystal panel that causes edge light leakage in the display module, thereby improving the display quality of the display module.

[0126] Based on the display module fabrication method in the above embodiments, this invention also provides a display module fabrication apparatus, such as... Figure 11As shown, the device includes: a flatness detection device 3, configured to detect the flatness information of the LCD panel and the backlight module; a processing module 5, electrically connected to the flatness detection device 3, configured to determine whether the backlight module needs flatness compensation based on the flatness information of the LCD panel and the backlight module, and to calculate the position and compensation value of the backlight module that needs flatness compensation; a flatness compensation device 4, electrically connected to the processing module 5, configured to perform flatness compensation on the position of the backlight module that needs flatness compensation; and a mating device 6, electrically connected to the flatness compensation device 4, configured to mat the LCD panel and the backlight module after passing through the flatness compensation device 4 to form a display module.

[0127] The alignment device 6 aligns the backlight module that has passed through the flatness compensation device 4. This means that the backlight module needs to go through the flatness compensation device 4 before it can be transferred to the alignment device 6. This ensures that the outline of the backlight module and the LCD panel are consistent during the alignment process, thereby eliminating the internal stress on the LCD panel under the alignment state and avoiding the problem of light leakage at the edge of the display module.

[0128] In some embodiments, the liquid crystal panel has a perimeter region and a central region, the perimeter region surrounding the central region, the perimeter region of the liquid crystal panel being divided into m first sub-regions, and the central region of the liquid crystal panel being divided into n second sub-regions; the backlight module has a perimeter region and a central region, the perimeter region surrounding the central region, the perimeter region of the backlight module being divided into m third sub-regions, the m third sub-regions corresponding one-to-one with the m first sub-regions, and the orthographic projections of the corresponding third sub-regions and the first sub-regions on their respective planes coincide.

[0129] In some embodiments, the flatness detection device 3 is configured to detect the flatness of each first sub-region and each second sub-region; and to detect the flatness of each third sub-region. The processing module 5 is configured to calculate the average flatness of m first sub-regions and n second sub-regions based on the flatness of each first sub-region and each second sub-region, to obtain a first average flatness value; calculate the difference between the flatness of each first sub-region and the first average flatness value, to obtain a first difference value; calculate the average first difference value of the m first sub-regions based on the first difference value; and calculate the difference between the first difference value of each first sub-region and the average first difference value, to obtain a second difference value. The flatness detection device 3 is further configured to calculate the average first difference value of the m third sub-regions based on the flatness of each third sub-region. The flatness mean of the sub-region is used to obtain the second flatness mean; the difference between the flatness of each third sub-region and the second flatness mean is calculated to obtain the third difference; the difference between the second difference and the third difference between the corresponding first and third sub-regions is calculated to obtain the fourth difference; it is determined whether the absolute value of the fourth difference is greater than a set value; if the determination result is yes, it is determined that the flatness compensation of that third sub-region of the backlight module needs to be performed, and the fourth difference is the compensation value; if the determination result is no, it is determined that the flatness compensation of that third sub-region of the backlight module does not need to be performed.

[0130] In some embodiments, the flatness compensation device 4 includes m movable blocks, which are configured to correspond one-to-one with m third sub-regions, and the orthographic projections of the corresponding movable blocks and third sub-regions on their respective planes coincide; the m movable blocks can move up and down in a direction perpendicular to the plane of the backlight module and the liquid crystal panel, respectively, so as to compensate for the flatness of each third sub-region of the backlight module.

[0131] In some embodiments, the flatness compensation device 4 further includes a vacuum pumping device (not shown in the figure). A hole is provided in the central region of the side of each movable block that is in contact with the backlight module, and the hole is connected to the vacuum pumping device. Through the vacuum pumping device and the hole in the movable block, the flatness compensation device 4 can achieve adsorption and fixation of the backlight module by vacuum pumping, so that the flatness compensation of each third sub-region of the backlight module can be performed separately.

[0132] In some embodiments, the material of the movable block includes silicone. Silicone has a certain degree of elasticity, so that the backlight module will not be squeezed and broken when the flatness compensation adjustment is performed, ensuring the integrity of the backlight module, while allowing its flatness to be adjusted.

[0133] The display module manufacturing equipment provided in this embodiment of the invention, by setting up a flatness detection device, a processing module and a flatness compensation device, can achieve targeted compensation for the flatness of different positions of the backlight module, so that the contours of the mated backlight module and the liquid crystal panel are consistent, eliminating the internal stress on the liquid crystal panel under the mating state, thereby avoiding the distortion and deformation of the liquid crystal panel and causing edge light leakage of the display module, and improving the display quality of the display module.

[0134] This invention also provides a display module, which is prepared using the above-described preparation method.

[0135] like Figure 12 As shown, the display module prepared by the above method does not exhibit edge light leakage, thus improving the display quality of the display module.

[0136] This display module can be used for any product or component with display functionality, such as LCD panels, LCD TVs, e-paper devices, mobile phones, tablets, laptops, monitors, digital photo frames, and navigators.

[0137] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A method for manufacturing a display module, comprising: Fabrication of backlight modules and LCD panels, The feature is that it further includes: detecting the flatness of the liquid crystal panel and obtaining the flatness information of the liquid crystal panel; Detect the flatness of the backlight module and obtain the flatness information of the backlight module; Based on the flatness information of the liquid crystal panel and the flatness information of the backlight module, it is determined whether the backlight module needs flatness compensation, and the position and compensation value of the backlight module that need flatness compensation are calculated. If so, then flatness compensation is performed on the positions of the backlight module that require flatness compensation; if not, then the backlight module and the liquid crystal panel are aligned to form the display module. The liquid crystal panel has four edge regions and a central region. The four edge regions surround the central region. The four edge regions of the liquid crystal panel are divided into m first sub-regions, and the central region of the liquid crystal panel is divided into n second sub-regions. The step of detecting the flatness of the liquid crystal panel and obtaining the flatness information of the liquid crystal panel includes: Detect the flatness of each first sub-region and each second sub-region; Calculate the average flatness of m first sub-regions and n second sub-regions based on the flatness of each first sub-region and each second sub-region to obtain the first flatness average; Calculate the difference between the flatness of each of the first sub-regions and the mean of the first flatness to obtain the first difference; Calculate the mean of the first differences among m of the first sub-regions based on the first difference; Calculate the difference between the first difference and the mean of the first differences for each of the first sub-regions to obtain the second difference; The backlight module has a four-sided edge area and a central area. The four-sided edge area surrounds the periphery of the central area. The four-sided edge area of ​​the backlight module is divided into m third sub-areas. The m third sub-areas correspond one-to-one with the m first sub-areas, and the orthographic projections of the corresponding third sub-areas and the first sub-areas on their respective planes coincide. The step of detecting the flatness of the backlight module and obtaining the flatness information of the backlight module includes: detecting the flatness of each of the third sub-regions; Calculate the average flatness of m third sub-regions based on the flatness of each third sub-region to obtain the second average flatness; Calculate the difference between the flatness of each of the third sub-regions and the average flatness of the second region to obtain the third difference; The step of determining whether the backlight module needs flatness compensation based on the flatness information of the liquid crystal panel and the backlight module, and calculating the location and compensation value of the backlight module requiring flatness compensation, includes: Calculate the difference between the second difference and the third difference between the first sub-region and the third sub-region corresponding to each group to obtain the fourth difference; Determine whether the absolute value of the fourth difference is greater than a set value; If yes, then it is determined that the third sub-region of the backlight module needs to be flattened, and the fourth difference is the compensation value; if no, then it is determined that the third sub-region of the backlight module does not need to be flattened.

2. The method for preparing a display module according to claim 1, characterized in that, A flatness compensation device is used to perform flatness compensation on the third sub-region of the backlight module. The flatness compensation device includes m movable blocks, each of which corresponds one-to-one with one of the m third sub-regions, and the orthographic projections of the corresponding movable blocks and the third sub-regions on their respective planes coincide. When the absolute value of the fourth difference is greater than the set value, the flatness compensation device is activated, and the movable block moves up or down along the first direction, causing the third sub-region corresponding to the movable block to move up or down by the compensation value distance along the first direction. The first direction is a direction perpendicular to the plane where the backlight module and the liquid crystal panel are located.

3. The method for preparing a display module according to claim 2, characterized in that, The movable block has holes, through which it performs vacuum adsorption on the third sub-region.

4. The method for preparing a display module according to claim 1, characterized in that, m of the first sub-regions are of the same size and shape; n second sub-regions are of the same size and shape; Alternatively, the m first sub-regions and the n second sub-regions are of the same size and shape.

5. The method for preparing a display module according to claim 4, characterized in that, m≥4, and m is an integer.

6. The method for preparing a display module according to claim 2, characterized in that, The set value ranges from 0.2 to 0.3 mm.

7. A display module manufacturing apparatus, characterized in that, include: A flatness detection device is configured to detect flatness information of an LCD panel and a backlight module; The processing module, electrically connected to the flatness detection device, is configured to determine whether the backlight module needs flatness compensation based on the flatness information of the liquid crystal panel and the flatness information of the backlight module, and to calculate the position and compensation value of the backlight module that needs flatness compensation. A flatness compensation device, electrically connected to the processing module, is configured to perform flatness compensation on the positions of the backlight module that require flatness compensation. The mating device, electrically connected to the flatness compensation device, is configured to mate the liquid crystal panel and the backlight module passing through the flatness compensation device to form the display module; The liquid crystal panel has a four-sided edge area and a central area. The four-sided edge area surrounds the central area. The four-sided edge area of ​​the liquid crystal panel is divided into m first sub-regions, and the central area of ​​the liquid crystal panel is divided into n second sub-regions. The flatness detection device is configured to detect the flatness of each first sub-region and each second sub-region; The processing module is configured to calculate the average flatness of m first sub-regions and n second sub-regions based on the flatness of each first sub-region and the flatness of each second sub-region, to obtain the first average flatness value; Calculate the difference between the flatness of each of the first sub-regions and the mean of the first flatness to obtain the first difference; Calculate the mean of the first differences among m of the first sub-regions based on the first difference; Calculate the difference between the first difference and the mean of the first differences for each of the first sub-regions to obtain the second difference; The backlight module has a four-sided edge area and a central area. The four-sided edge area surrounds the periphery of the central area. The four-sided edge area of ​​the backlight module is divided into m third sub-areas. The m third sub-areas correspond one-to-one with the m first sub-areas, and the orthographic projections of the corresponding third sub-areas and the first sub-areas on their respective planes coincide. The flatness detection device is also configured to detect the flatness of each of the third sub-regions; The processing module is further configured to calculate the average flatness of m third sub-regions based on the flatness of each third sub-region, and obtain a second average flatness value; Calculate the difference between the flatness of each of the third sub-regions and the average flatness of the second region to obtain the third difference; Calculate the difference between the second difference and the third difference between the first sub-region and the third sub-region corresponding to each group to obtain the fourth difference; Determine whether the absolute value of the fourth difference is greater than a set value; And when the judgment result is yes, it is determined that flatness compensation needs to be performed on the third sub-region of the backlight module, and the fourth difference is the compensation value; If the determination result is negative, it is determined that the third sub-region of the backlight module does not require flatness compensation.

8. The equipment for manufacturing a display module according to claim 7, characterized in that, The flatness compensation device includes m movable blocks, which are configured to correspond one-to-one with the m third sub-regions, and the orthographic projections of the corresponding movable blocks and the third sub-regions on their respective planes coincide. The m movable blocks can move up and down along a direction perpendicular to the plane where the backlight module and the liquid crystal panel are located, respectively, to compensate for the flatness of each of the third sub-regions of the backlight module.

9. The equipment for manufacturing a display module according to claim 8, characterized in that, The flatness compensation device also includes a vacuum pumping device. Each of the movable blocks has a hole in the central region of the side that contacts the backlight module, and the hole is connected to the vacuum pumping device.

10. The equipment for manufacturing a display module according to claim 9, characterized in that, The material of the movable block includes silicone.

11. A display module, characterized in that, The display module is prepared using the preparation method described in any one of claims 1-6.

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