Liquid crystal panel inspection device and method

Abstract

The application relates to the technical field of liquid crystal panel detection, and provides a liquid crystal panel detection device and method, the liquid crystal panel detection device comprises a workbench, a driving mechanism, a pressure applying assembly, a camera and an upper computer, the workbench is used for placing a liquid crystal panel, the driving mechanism is installed on the workbench, the pressure applying assembly comprises a supporting piece installed on the driving mechanism, a pressure applying piece movably supported on the supporting piece, and a contact sensing unit arranged between the supporting piece and the pressure applying piece, the pressure applying piece is in contact with or separated from the liquid crystal panel under the driving of the driving mechanism, the camera is suspended above the liquid crystal panel, the driving mechanism, the contact sensing unit and the camera are electrically connected with the upper computer, the liquid crystal panel can be detected in quality by using the liquid crystal panel detection device, high accuracy can be achieved, and the detection efficiency is high due to the automatic detection mode.

Description

Technical Field

[0001] This invention relates to the field of liquid crystal panel testing technology, and in particular provides a liquid crystal panel testing apparatus and method. Background Technology

[0002] LCD panels are widely used in display devices such as computers, mobile phones, and home appliances. When an LCD panel is pressed, it undergoes a brief structural change, altering the direction of backlight transmission and causing a localized change in optical effects. This results in a display effect that is almost the opposite of the original, a phenomenon commonly known as "light leakage." The time required for the LCD panel to recover its normal display effect after being pressed is called the pressure recovery time. Currently, most manufacturers use pressure recovery time tests to determine the quality of LCD panels.

[0003] Current methods for quality inspection of LCD panels mainly involve manually placing weights on the LCD panel to apply pressure, then quickly removing the weights and simultaneously observing the recovery of the LCD display with the naked eye while timing the process with a timer. This results in the LCD panel's pressure recovery time. The measured pressure recovery time is then compared with a standard pressure recovery time. If the measured pressure recovery time is less than or equal to the standard pressure recovery time, the LCD panel is considered to be of acceptable quality.

[0004] However, since existing LCD panel quality inspection methods mainly rely on manual labor, actions such as placing and removing weights, visual inspection, and manual operation of timers all have significant time delays, resulting in inaccurate test results. Summary of the Invention

[0005] The purpose of this invention is to provide a liquid crystal panel testing device and method, which aims to solve the technical problem of low accuracy in existing liquid crystal panel quality testing methods.

[0006] To achieve the above objectives, the technical solution adopted in this embodiment of the invention is: a liquid crystal panel testing device, comprising:

[0007] A workbench used to place LCD panels;

[0008] The drive mechanism is mounted on the worktable;

[0009] The pressure application component includes a support mounted on the drive mechanism, a pressure application component movably supported on the support, and a contact sensing unit disposed between the support and the pressure application component. The pressure application component abuts against or separates from the liquid crystal panel under the drive of the drive mechanism.

[0010] The camera is suspended above the LCD panel;

[0011] The host computer is electrically connected to the drive mechanism, the contact sensing unit, and the camera.

[0012] The liquid crystal panel detection device provided in this embodiment of the invention has at least the following beneficial effects: When detecting a liquid crystal panel, the liquid crystal panel is first powered on and lit, and then the host computer controls the camera to take a first picture of the liquid crystal panel; subsequently, the host computer controls the driving mechanism to drive the pressure application component to move to the detection position of the liquid crystal panel and make the pressure application component of the pressure application component abut against the liquid crystal panel. At this time, the contact sensing unit sends an electrical signal to the host computer for the first time. After receiving the electrical signal, the host computer controls the driving mechanism to stop operating and starts calculating the set time; after the set time, the host computer controls the driving mechanism to drive the pressure application component away from the area where the liquid crystal panel is located, and at the same time, the contact sensing unit sends an electrical signal to the host computer for the second time; the above-mentioned liquid crystal panel detection device has two working modes. When the user selects the first working mode, after the host computer receives the electrical signal sent to it by the contact sensing unit for the second time, the host computer starts calculating the standard pressure recovery time. After the standard pressure recovery time, the host computer controls the camera to take a second picture. In the second shooting process, the host computer compares and analyzes the images obtained from the two shootings. If the pressure recovery of the LCD panel meets the standard requirements, the LCD panel is considered qualified; otherwise, it is considered unqualified. When the user selects the second working mode, after receiving the electrical signal sent to it by the contact sensing unit for the second time, the host computer records the separation time between the pressure-applying component and the LCD panel and controls the camera to continuously shoot the LCD panel for a duration longer than the standard pressure recovery time. The host computer also records the shooting time of each shot. The host computer compares and analyzes each of the continuously shot images with the image obtained from the first shooting until an image showing that the pressure recovery of the LCD panel meets the standard requirements is obtained. The difference between the shooting time and the separation time corresponding to this image, plus the communication delay time, is the pressure recovery time of the LCD panel. If the pressure recovery time of the LCD panel is less than or equal to the standard pressure recovery time, the LCD panel is considered qualified; otherwise, it is considered unqualified. Thus, by controlling the drive mechanism via the host computer to drive the pressure component to contact or separate from the LCD panel, and sending contact or separation signals to the host computer via the contact sensing unit, the system responds quickly and effectively reduces delay errors. Simultaneously, by capturing images of the LCD panel sequentially via a camera and transmitting these images to the host computer for comparison and analysis, the recovery status of the LCD panel after pressure can be accurately determined. Furthermore, timing via the host computer further reduces delay errors. Therefore, the aforementioned LCD panel detection device achieves high accuracy in quality inspection of LCD panels, and its automated inspection method results in high efficiency.

[0013] In one embodiment, the drive mechanism includes a first horizontal drive component and a vertical drive component, the vertical drive component being mounted on the power output end of the first horizontal drive component, and the support being fixedly mounted on the power output end of the vertical drive component.

[0014] In one embodiment, the first horizontal drive assembly includes a first bracket, a first motor mounted on the first bracket and electrically connected to the upper electromechanical unit, a first screw rotatably mounted on the first bracket and connected to the power output end of the first motor, and a first ball nut cooperating with the first screw.

[0015] The vertical drive assembly includes a second bracket mounted on the first ball nut, a second motor mounted on the second bracket and electrically connected to the upper electromechanical unit, a second screw rotatably mounted on the second bracket and connected to the power output end of the second motor, and a second ball nut cooperating with the second screw.

[0016] The support component is mounted on the second ball nut.

[0017] In one embodiment, the drive mechanism further includes a second horizontal drive component electrically connected to the upper electromechanical unit, the first horizontal drive component is mounted on the power output end of the second horizontal drive component, and the drive direction of the first horizontal drive component forms an angle with the drive direction of the second horizontal drive component.

[0018] In one embodiment, the second horizontal drive assembly includes a third bracket, a third motor mounted on the third bracket and electrically connected to the upper electromechanical unit, a third screw rotatably mounted on the third bracket and connected to the power output end of the third motor, and a third ball nut cooperating with the third screw, wherein the first horizontal drive assembly is mounted on the third ball nut.

[0019] In one embodiment, the pressure-applying member includes a weight portion and a pressure head disposed on the side of the weight portion near the liquid crystal panel, and the support member has a through hole for the pressure head to extend out.

[0020] In one embodiment, the support member includes a cylindrical body and a support plate covering an open end of the cylindrical body near the liquid crystal panel, the support plate having the through hole.

[0021] In one embodiment, the contact sensing unit is disposed between the weight portion and the support member.

[0022] In one embodiment, the pressure-applying component further includes a flexible sleeve that is fitted onto the pressure-applying head.

[0023] In one embodiment, the pressure head is provided with a bayonet, and the flexible sleeve is provided with a locking part that engages with the bayonet.

[0024] In one embodiment, the support member has a receiving cavity for accommodating the pressure-applying member, and the support member has a displacement port for connecting the receiving cavity to the outside.

[0025] In one embodiment, the liquid crystal panel testing device further includes a clamp mounted on the worktable for fixing the liquid crystal panel.

[0026] To achieve the above objectives, embodiments of the present invention also provide a liquid crystal panel detection method, comprising the following steps:

[0027] Set the standard pressure recovery time T in the host computer;

[0028] The LCD panel is powered on and lit up. The host computer controls the camera to take the first picture of the LCD panel and obtain image A.

[0029] The host computer controls the operation of the drive mechanism, which drives the pressure component to move to the detection position of the LCD panel and makes the pressure component of the pressure component contact the LCD panel. At the same time, the contact sensing unit transmits a first electrical signal to the host computer. After receiving the first electrical signal, the host computer controls the drive mechanism to stop operating and starts calculating the set time t1.

[0030] After the set time t1, the host computer controls the drive mechanism to operate, and the drive mechanism drives the pressure component to leave the area where the liquid crystal panel is located. At the instant when the pressure component separates from the liquid crystal panel, the contact sensing unit sends a second electrical signal to the host computer. After receiving the second electrical signal, the host computer starts to calculate the standard pressure recovery time T.

[0031] After the standard pressure recovery time T, the host computer controls the camera to take a second picture of the LCD panel to obtain image B;

[0032] The host computer performs a difference comparison analysis between image B and image A to determine whether the pressure recovery of the liquid crystal panel meets the standard requirements. If so, the liquid crystal panel is qualified; otherwise, the liquid crystal panel is unqualified.

[0033] By using the above-mentioned testing methods to inspect the quality of LCD panels, high accuracy can be achieved, and the automated testing method results in high testing efficiency.

[0034] In one embodiment, the difference comparison analysis between image B and image A includes the following steps:

[0035] Obtain the first gray value K1 of each pixel in the detection range of image B, and obtain the second gray value K2 of each pixel in the detection range of image A, and compare the gray values ​​of each first gray value K1 and each second gray value K2 in a one-to-one correspondence.

[0036] The number of pixels in image B whose difference between the first grayscale value K1 and the second grayscale value K2 is greater than the pixel grayscale threshold K0 is counted to obtain the number of unqualified pixels n. If the number of unqualified pixels n is less than or equal to the standard number of qualified pixels N, then the quality of the liquid crystal panel is qualified; otherwise, the quality of the liquid crystal panel is unqualified.

[0037] To achieve the above objectives, embodiments of the present invention also provide a liquid crystal panel detection method, comprising the following steps:

[0038] Set the standard pressure recovery time T′ in the host computer;

[0039] The LCD panel is powered on and lit up. The host computer controls the camera to take the first picture of the LCD panel and obtain image A′.

[0040] The host computer controls the operation of the drive mechanism, which drives the pressure application component to move to the detection position of the LCD panel and makes the pressure application component of the pressure application component abut against the LCD panel. At the same time, the contact sensing unit transmits a third electrical signal to the host computer. After receiving the third electrical signal, the host computer controls the drive mechanism to stop operating and starts calculating the set time t′1.

[0041] After the set time t′1, the host computer controls the drive mechanism to operate, and the drive mechanism drives the pressure component to leave the area where the liquid crystal panel is located. At the instant when the pressure component separates from the liquid crystal panel, the contact sensing unit sends a fourth electrical signal to the host computer. After receiving the fourth electrical signal, the host computer records the separation time of the pressure component from the liquid crystal panel as t′3.

[0042] The host computer controls the camera to take multiple consecutive pictures of the LCD panel. The shooting duration is t′4, which is greater than the standard pressure recovery time T′, to obtain images B′1, B′2, ..., B′n. At the same time, the host computer records the shooting time of each shot as Tb1, Tb2, Tb3, ..., Tbn.

[0043] The host computer performs a difference comparison analysis between the image B′1, the image B′2, ..., the image B′n and the image A′, until an image B′ that meets the standard requirements for pressure recovery is obtained. The shooting time corresponding to the image B′ is Tb′. Then, the pressure recovery time T′0 of the liquid crystal panel is equal to the shooting time Tb′ - the separation time t′3 + the communication delay time td. If the pressure recovery time T′0 of the liquid crystal panel is less than or equal to the standard pressure recovery time T′, then the liquid crystal panel is of qualified quality; otherwise, the liquid crystal panel is of unqualified quality.

[0044] By using the above-mentioned testing methods to inspect the quality of LCD panels, high accuracy can be achieved, and the automated testing method results in high testing efficiency.

[0045] In one embodiment, when performing a difference comparison analysis between image B′1, image B′2, ..., image B′n and image A′, the following steps are included:

[0046] Obtain the first gray value K′1 of each pixel in the image B′n within the detection range, and obtain the second gray value K′2 of each pixel in the image A′ within the detection range. Compare the gray values ​​of each first gray value K′1 and each second gray value K′2 in a one-to-one correspondence.

[0047] The number of pixels in the image B′n whose difference between the first gray value K′1 and the second gray value K′2 is greater than the pixel gray value threshold K′0 is counted to obtain the number of unqualified pixels n′. If the number of unqualified pixels n′ is less than or equal to the standard number of qualified pixels N′, the image B′n is recorded as image B′, and the shooting time corresponding to image B′ is Tb′. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 This is a schematic diagram of the structure of the liquid crystal panel testing device provided in an embodiment of the present invention;

[0050] Figure 2 for Figure 1 A schematic diagram of the driving mechanism in the LCD panel detection device shown.

[0051] Figure 3 for Figure 1Left view of the pressure application component in the LCD panel detection device shown;

[0052] Figure 4 for Figure 3 A sectional view of the pressure-applying component shown along line AA;

[0053] Figure 5 This is a cross-sectional view of the pressure-applying component applying pressure to the liquid crystal panel according to an embodiment of the present invention.

[0054] Figure 6 This is a schematic diagram of the pressure-time relationship in an embodiment of the present invention;

[0055] Figure 7 This is a schematic diagram illustrating the pressure-time relationship of a conventional sensor.

[0056] Figure 8 for Figure 1 An exploded view of the pressure application component in the LCD panel testing device shown.

[0057] Figure 9 A flowchart of a liquid crystal panel detection method provided in an embodiment of the present invention;

[0058] Figure 10 for Figure 9 The flowchart of image difference comparison and analysis in the liquid crystal panel detection method is shown.

[0059] Figure 11 A flowchart of a liquid crystal panel detection method provided in another embodiment of the present invention;

[0060] Figure 12 for Figure 11 The flowchart of image difference comparison and analysis in the liquid crystal panel detection method is shown.

[0061] The following are the labeling elements in the figure:

[0062] 10. Worktable; 20. Drive mechanism; 21. First horizontal drive assembly; 211. First support; 212. First motor; 213. First screw; 214. First ball nut; 22. Vertical drive assembly; 221. Second support; 222. Second motor; 223. Second screw; 224. Second ball nut; 23. Second horizontal drive assembly; 231. Third support; 232. Third motor; 233. Third screw; 234. Third... 30. Ball bearing nut, 31. Pressure application component, 31. Support component, 311. Through hole, 312. Receiving cavity, 313. Replacement port, 314. Cylinder, 315. Support plate, 32. Pressure application component, 321. Weight part, 322. Pressure head, 3221. Bayonet, 323. Flexible sleeve, 3231. Locking part, 33. Contact sensing unit, 34. Mounting base, 40. Camera, 50. Host computer, 60. Fixture, 70. Fourth bracket, 80. LCD panel. Detailed Implementation

[0063] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0064] In the description of this invention, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0065] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0066] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] Please combine Figures 1 to 5 and Figure 8 As shown, a liquid crystal panel testing device includes a worktable 10, a driving mechanism 20, a pressure application component 30, a camera 40, and a host computer 50. The worktable 10 is used to place the liquid crystal panel 80. The driving mechanism 20 is mounted on the worktable 10. The pressure application component 30 includes a support member 31 mounted on the driving mechanism 20, a pressure application component 32 that can be movably supported on the support member 31, and a contact sensing unit 33 disposed between the support member 31 and the pressure application component 32. The pressure application component 32 abuts against or separates from the liquid crystal panel 80 under the drive of the driving mechanism 20. The camera 40 is suspended above the liquid crystal panel 80. The driving mechanism 20, the contact sensing unit 33, and the camera 40 are all electrically connected to the host computer 50.

[0068] When using the LCD panel detection device to detect the LCD panel 80, the LCD panel 80 is first powered on and lit. Then, the host computer 50 controls the camera 40 to take a first picture of the LCD panel 80. Subsequently, the host computer 50 controls the drive mechanism 20 to drive the pressure application component 30 to move to the detection position of the LCD panel 80 and make the pressure application component 32 of the pressure application component 30 contact the LCD panel 80. At this time, the contact sensing unit 33 sends an electrical signal to the host computer 50 for the first time. After receiving the electrical signal, the host computer 50 controls the drive mechanism 20 to stop operating and starts calculating the set time. After the set time, the host computer 50 controls the drive mechanism 20 to drive the pressure application component 30 away from the area where the LCD panel 80 is located, and at the same time, the contact sensing unit 33 sends an electrical signal to the host computer 50 for the second time. The above-mentioned LCD panel detection device has two working modes. When the user selects the first working mode, after the host computer receives the electrical signal sent to it by the contact sensing unit for the second time, the host computer 50 starts calculating the standard pressure recovery time. After the standard pressure recovery time, the host computer 50... The host computer 50 controls the camera 40 to take a second picture. The host computer 50 compares and analyzes the images obtained from the two pictures. If the pressure recovery of the LCD panel 80 meets the standard requirements, the LCD panel 80 is qualified; otherwise, the LCD panel 80 is unqualified. When the user selects the second working mode, the separation time between the pressure component 30 and the LCD panel 80 is recorded, and the camera 40 is controlled to continuously take pictures of the LCD panel 80. The shooting duration is longer than the standard pressure recovery time, and the shooting time of each picture is recorded. The host computer 50 compares and analyzes the multiple images obtained from the continuous shooting one by one with the image obtained from the first picture until an image is obtained showing that the pressure recovery of the LCD panel 80 meets the standard requirements. The difference between the shooting time and the separation time corresponding to this image plus the communication delay time is the pressure recovery time of the LCD panel 80. If the pressure recovery time of the LCD panel 80 is less than or equal to the standard pressure recovery time, the LCD panel 80 is qualified; otherwise, the LCD panel 80 is unqualified. Thus, the host computer 50 controls the drive mechanism 20 to drive the pressure application component 30 to contact or separate from the LCD panel 80, and sends a contact signal or separation signal to the host computer 50 through the contact sensing unit 33. The system responds quickly and effectively reduces delay errors. At the same time, the camera 40 captures images of the LCD panel 80 sequentially and transmits the images to the host computer 50 for comparison and analysis, which can accurately determine the recovery status of the LCD panel 80 after being pressed. In addition, timing by the host computer 50 can further reduce delay errors. It can be seen that the above-mentioned LCD panel detection device can achieve high accuracy in quality detection of the LCD panel 80, and the automated detection method has high detection efficiency.

[0069] Specifically, please combine Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 8 As shown, the pressure application assembly 30 also includes a mounting base 34, through which the support member 31 is mounted on the drive mechanism 20.

[0070] Specifically, the contact sensing unit 33 is a pressure sensor or a displacement sensor.

[0071] Specifically, please combine Figure 1 As shown, the LCD panel testing device also includes a fourth bracket 70 mounted on the worktable 10. The fourth bracket 70 is used to mount the camera 40. In particular, the fourth bracket 70 is a telescopic bracket, which facilitates the horizontal and / or vertical position adjustment of the camera 40; or, the fourth bracket 70 is a multi-axis rotating arm bracket, which facilitates the arbitrary position adjustment of the camera 40 in three-dimensional space.

[0072] In this embodiment, please refer to Figure 1 and Figure 2 As shown, the drive mechanism 20 includes a first horizontal drive assembly 21 and a vertical drive assembly 22, both electrically connected to the host computer 50. The vertical drive assembly 22 is mounted on the power output end of the first horizontal drive assembly 21, and the support member 31 is fixedly mounted on the power output end of the vertical drive assembly 22. During operation, after the host computer 50 controls the camera 40 to take the first picture of the LCD panel 80, the host computer 50 controls the first horizontal drive assembly 21 to drive the pressure application assembly 30 to the area where the LCD panel 80 is located. Then, the host computer 50 controls the vertical drive assembly 22 to drive the pressure application assembly 30 downward at a certain speed until the pressure application assembly 32 contacts the LCD panel 80. After a set time, the host computer 50 controls the first horizontal drive assembly 21 and the vertical drive assembly 22 to reset, causing the pressure application assembly 30 to leave the area where the LCD panel 80 is located.

[0073] Specifically, please combine Figure 1 and Figure 2As shown, the first horizontal drive assembly 21 includes a first bracket 211, a first motor 212 mounted on the first bracket 211 and electrically connected to the host computer 50, a first screw 213 rotatably mounted on the first bracket 211 and connected to the power output end of the first motor 212, and a first ball nut 214 cooperating with the first screw 213; the vertical drive assembly 22 includes a second bracket 221 mounted on the first ball nut 214, a second motor 222 mounted on the second bracket 221 and electrically connected to the host computer 50, a second screw 223 rotatably mounted on the second bracket 221 and connected to the power output end of the second motor 222, and a second ball nut 224 cooperating with the second screw 223; the support member 31 is mounted on the second ball nut 224. By adopting the above technical solution, both the first horizontal drive component 21 and the vertical drive component 22 form a motor combined with a ball screw drive structure, which has high driving accuracy and further improves the detection accuracy of the above-mentioned liquid crystal panel detection device.

[0074] Of course, both the first horizontal drive assembly 21 and the vertical drive assembly 22 can adopt various drive structure forms, such as cylinder drive structure, linear motor drive structure, etc., without specific limitations here.

[0075] In this embodiment, please refer to Figure 1 and Figure 2 As shown, the drive mechanism 20 also includes a second horizontal drive assembly 23 electrically connected to the host computer 50. The first horizontal drive assembly 21 is installed at the power output end of the second horizontal drive assembly 23, and the driving direction of the first horizontal drive assembly 21 and the driving direction of the second horizontal drive assembly 23 form an angle with each other. Specifically, the driving direction of the first horizontal drive assembly 21 and the driving direction of the second horizontal drive assembly 23 are perpendicular to each other. During operation, after the host computer 50 controls the camera 40 to take the first picture of the LCD panel 80, the host computer 50 controls the first horizontal drive assembly 21 and the second horizontal drive assembly 23 to jointly drive the pressure application assembly 30 to reach the liquid. The pressure component 30 is aligned with the detection area of ​​the liquid crystal panel 80. The vertical drive component 22 is then controlled to drive the pressure component 30 downward at a certain speed until the pressure component 32 contacts the liquid crystal panel 80. After a set time, the host computer 50 controls the first horizontal drive component 21 and the vertical drive component 22 to reset, causing the pressure component 30 to leave the area of ​​the liquid crystal panel 80. The first horizontal drive component 21, the second horizontal drive component 23, and the vertical drive component 22 together constitute a three-axis drive mechanism 20, allowing the pressure component 30 to reach any position on the liquid crystal panel 80, thereby realizing quality detection of different parts of the liquid crystal panel 80.

[0076] Specifically, please combine Figure 1 and Figure 2As shown, the second horizontal drive assembly 23 includes a third bracket 231, a third motor 232 mounted on the third bracket 231 and electrically connected to the host computer 50, a third screw 233 rotatably mounted on the third bracket 231 and connected to the power output end of the third motor 232, and a third ball nut 234 cooperating with the third screw 233. The first horizontal drive assembly 21 is mounted on the third ball nut 234. By adopting the above technical solution, the second horizontal drive assembly 23 forms a motor combined with a ball screw drive structure, which has high driving accuracy and further improves the detection accuracy of the above-mentioned LCD panel detection device.

[0077] Of course, the second horizontal drive component 23 can adopt various drive structure forms, such as cylinder drive structure, linear motor drive structure, etc., and no specific limitation is made here.

[0078] In this embodiment, please refer to Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 8 As shown, the pressure-applying member 32 includes a weight portion 321 and a pressure head 322 disposed on the side of the weight portion 321 near the LCD panel 80. The support member 31 has a through hole 311 for the pressure head 322 to extend out.

[0079] It should be noted that the contact sensing unit 33 is located between the support member 31 and the pressure member 32. Specifically, the contact sensing unit 33 is located between the weight part 321 and the support member 31, and the pressure head 322 extends through the through hole 311 and is located on the other side of the support member 32 opposite to the contact sensing unit 33.

[0080] Specifically, please combine Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 8 As shown, the support member 31 includes a cylindrical body 314 and a support plate 315 covering an open end of the cylindrical body 314 near the liquid crystal panel 80, with a through hole 311 formed on the support plate 315.

[0081] Specifically, please combine Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 8 As shown, the pressure-applying component 32 also includes a flexible sleeve 323, which is sleeved on the pressure-applying head 322. By providing the flexible sleeve 323 on the pressure-applying head 322, hard contact between the pressure-applying head 322 and the liquid crystal panel 80 is effectively prevented, thereby avoiding damage to the liquid crystal panel 80 caused by the pressure-applying head 322.

[0082] Specifically, there are various types of flexible sleeves 323, such as silicone sleeves and rubber sleeves, which are not specifically limited here.

[0083] Specifically, please combine Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 8 As shown, the pressure head 322 is provided with a bayonet 3221, and the flexible sleeve 323 is provided with a locking part 3231 that engages with the bayonet 3221. By engaging the locking part 3231 of the flexible sleeve 323 with the bayonet 3221 of the pressure head 322, the flexible sleeve 323 can be disassembled and installed, making it convenient to replace the flexible sleeve 323.

[0084] In this embodiment, please refer to Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 8 As shown, the support member 31 has a receiving cavity 312 for accommodating the pressure-applying member 32, and the support member 31 has a replacement port 313 for connecting the receiving cavity 312 to the outside. The user can remove the pressure-applying member 32 from the receiving cavity 312 through the replacement port 313 according to actual testing needs, and then place pressure-applying members 32 of different weights into the receiving cavity 312 through the replacement port 313, thereby replacing the pressure-applying member 32 to meet the testing requirements of different LCD panels 80 and improving the versatility of the aforementioned LCD panel testing device.

[0085] Specifically, the cylinder 314 and the support plate 315 together define the aforementioned receiving cavity 312.

[0086] Furthermore, the receiving cavity 312 is configured to allow the pressure-applying member 32 to move vertically after it is received. The receiving cavity 312 contains a portion (i.e., the weight portion 321) of the pressure-applying member 32. In the direction of movement of the pressure-applying member 32, the receiving cavity 312 is configured to be larger than the weight portion 321 contained therein, allowing the pressure-applying member 32 to move within the receiving cavity 312. In one embodiment, the receiving cavity 312 provides space for movement in the direction of movement of the pressure-applying member 32 after it is received, allowing the pressure-applying member 32 to move back and forth along the sidewall of the receiving cavity 312. During design and assembly, the contact sensing unit 33 can be fitted into the support member 31, i.e., fitted to the side of the support member 31 facing the receiving cavity 312.

[0087] With this design, the pressure applied by the pressure-applying member 32 to the contact sensing unit 33 is related to the weight of the weight portion 321 of the pressure-applying member 32. During the period when the pressure-applying member 32 is in contact with the liquid crystal panel 80, the support member 31 moves up and down relative to the pressure-applying member 32 for a period of time while the pressure-applying member 32 remains stationary, and the support member 31 and the pressure-applying member 32 remain stationary for another period of time.

[0088] When the pressure application component 30 moves to the detection position of the liquid crystal panel 80 and the pressure application member 32 of the pressure application component 30 comes into contact with the liquid crystal panel 80 through its pressure head 322, the weight part 321 (relative to the support member 31) appears to be pushed up (in reality, the support member 31 is pushed downward relative to the weight part 321), causing the contact sensing unit 33 to generate a signal change, and the contact sensing unit 33 sends an electrical signal to the host computer 50. Generally, the contact sensing unit 33 can be set to generate an electrical signal when it generates a certain value change, or the processor at the other end can be set to continuously receive the signal and its change from the contact sensing unit 33, and generate an electrical signal when it determines that a certain value change has occurred. Preferably, the change in value can be set to generate an electrical signal when it corresponds to the change in weight of the pressure application member 32 (mainly the weight part 321).

[0089] In one embodiment, the contact sensing unit 33 is a pressure sensor. The pressure sensor is calibrated, and its circuitry is capable of measuring the load weight within a certain accuracy to ensure that the weight of the weight unit 321 is fully applied to the liquid crystal panel 80 before sending a signal to the host computer 307 during pressure application. In other words, the pressure sensor sends an electrical signal when the weight unit 321 is raised to the point where there is essentially no gravity applied to the contact sensing unit 33 or no contact with the contact sensing unit 33 during pressure application. Figure 4 The diagram shows the state of the pressure-applying component 30 before or after contacting the liquid crystal panel 80 (or when it only contacts the liquid crystal panel 80 without applying substantial force). It is evident that the contact sensing unit 33 is sandwiched between the weight portion 321 and the support plate 315, with the weight of the weight portion 321 applied to the contact sensing unit 33 against the support plate 315. During detection, when the pressure-applying component 322 moves towards the liquid crystal panel 80 and contacts its surface, it continues to move a certain distance towards the liquid crystal panel 80. At this time, the support member 31 and the contact sensing unit 33 continue to move towards the liquid crystal panel 80 (e.g., downwards), while the pressure member 32 (including the weight portion 321 and the pressure head 322) remains stationary; that is, the support member 31 and the contact sensing unit 33 appear to move in the opposite direction to the pressure member 32. This process occurs over a period of time during the contact between the pressure member 32 and the liquid crystal panel 80.

[0090] Figure 5The diagram illustrates the situation after the pressure-applying component 322 contacts the liquid crystal panel 80 and continues a certain distance towards it. As can be seen in the figure, the weight portion 321 appears to have moved in the opposite direction to the support member 31 and the contact sensing unit 33 (i.e., the support member 31 and the contact sensing unit 33 move downwards relative to the stationary weight portion 321) for a certain distance, and then is no longer in contact with the contact sensing unit 33; that is, its weight is no longer applied to the contact sensing unit 33. It should be noted that... Figure 5 The gap between the weight portion 321 and the contact sensing unit 33 does not necessarily conform to an actual proportion; it is only for illustrative purposes to show the state where the weight portion 321 does not apply pressure to the contact sensing unit 33. In one design, the pressure-applying component 322 can be set to continue moving towards the liquid crystal panel 80 after touching the surface of the liquid crystal panel 80 until the gap between the weight portion 321 and the contact sensing unit 33 is 0.1mm to 2cm, or other suitable values ​​or ranges. In another design, the pressure-applying component 322 can be set to continue moving towards the liquid crystal panel 80 after touching the surface of the liquid crystal panel 80 until the weight applied by the weight portion 321 to the contact sensing unit 33 disappears, at which point the pressure-applying component 322 stops moving. In this case, one possibility is that a gap can be formed between the weight portion 321 and the contact sensing unit 33, with the gap being less than 2cm. Another possibility is that the gap is very small and essentially negligible. Yet another possibility is that the weight portion 321 and the contact sensing unit 33 are still in contact, but essentially the weight of the weight portion 321 is not applied to the contact sensing unit 33. The solution in this embodiment is advantageous because when the pressure of the weight part 321 on the contact sensing unit 33 disappears, the host computer 50 receives an electrical signal, controls the drive mechanism 20 to stop operating, and starts calculating the set time.

[0091] like Figure 6 As shown, the Y-axis represents the pressure applied to the LCD panel 80, and the X-axis represents time. T1 is the moment when the pressure-applying component 322 touches the LCD panel 80 after it moves towards the LCD panel 80. The time required for the weight unit 321 to move away from the LCD panel 80 after the pressure-applying head 322 touches it is very short; the pressure applied to the LCD panel 80 reaches the target value almost immediately, and the drive mechanism 20 stops operating simultaneously. Figure 7 The pressure-time relationship of other conventional detection devices is shown, indicating that continuous pressure monitoring is required until the target value is reached before stopping operation, with the required time being from T1 to T2. During the period when the pressure-applying member 32 is in contact with the liquid crystal panel 80, after reaching the target pressure value P1, the support member 31 and the pressure-applying member 32 remain stationary for a period of time to maintain the pressure applied to the liquid crystal panel 80.

[0092] Furthermore, in this embodiment, after a set time, the host computer 50 controls the drive mechanism 20 to drive the pressure-applying component 30 away from the area where the liquid crystal panel 80 is located, and at the same time, the contact sensing unit 33 sends an electrical signal to the host computer 50 for the second time. In one design, this electrical signal can be sent at the moment when the weight of the weight part 321 is reapplied to the contact sensing unit 33 when the pressure-applying component 30 leaves. Specifically, when the pressure-applying component 30 leaves, the support member 31 and the contact sensing unit 33 leave the liquid crystal panel 80, and the pressure-applying component 32 remains in contact with the liquid crystal panel 80 for a period of time until it re-contacts the contact sensing unit 33, at which point the pressure applied to the liquid crystal panel 80 by the weight part 321 disappears. The moment when the pressure applied to the liquid crystal panel 80 by the weight part 321 disappears can be set to send an electrical signal to the host computer 50. This process also occurs during the period when the pressure-applying component 32 is in contact with the liquid crystal panel 80, during which time the support member 31 moves upward relative to the pressure-applying component 32 (i.e., leaves the liquid crystal panel 80) while the pressure-applying component 32 remains stationary.

[0093] In the above embodiment, three time periods are described during the contact between the pressure member 32 and the liquid crystal panel 80. In the first time period, the support member 31 moves downward relative to the pressure member 32 while the pressure member 32 remains stationary; in the third time period, the support member 31 moves upward relative to the pressure member 32 while the pressure member 32 remains stationary. These two time periods can be understood as the movement time of the support member 31 during the contact between the pressure member 32 and the liquid crystal panel 80. In the second time period, both the support member 31 and the pressure member 32 remain stationary. This second time period can be understood as the time during which the support member 31, like the pressure member 32, remains stationary during the contact between the pressure member 32 and the liquid crystal panel 80. Through this embodiment, the pressure on the liquid crystal panel 80 depends on the weight of the weight portion 321, making the applied pressure weight accurate and consistent. Furthermore, the detection time can depend on the pressure formation time and disappearance time applied to the liquid crystal panel 80, making detection more accurate and convenient.

[0094] In this embodiment, please refer to Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 8 As shown, the LCD panel testing device also includes a clamp 60 mounted on the worktable 10, which is used to fix the LCD panel 80. By fixing the LCD panel 80 with the clamp 60, displacement of the LCD panel 80 is prevented during the testing process, thus more effectively ensuring the testing accuracy of the LCD panel testing device.

[0095] Example 1

[0096] Please combine Figure 9 and Figure 10 As shown, a liquid crystal panel testing method includes the following steps:

[0097] Step S100: Set the standard pressure recovery time T in the host computer 50;

[0098] Step S200: Power on the LCD panel 80 and turn it on. The host computer 50 controls the camera 40 to take the first picture of the LCD panel 80 and obtain image A.

[0099] In step S300, the host computer 50 controls the drive mechanism 20 to operate. The drive mechanism 20 drives the pressure component 30 to move to the detection position of the LCD panel 80, and makes the pressure component 32 of the pressure component 30 contact the LCD panel 80. At the same time, the contact sensing unit 33 transmits the first electrical signal to the host computer 50. After receiving the first electrical signal, the host computer 50 starts to calculate the set time t1.

[0100] Step S400: After a set time t1, the host computer 50 controls the drive mechanism 20 to operate. The drive mechanism 20 drives the pressure component 30 to leave the area where the LCD panel 80 is located. At the instant when the pressure component 30 separates from the LCD panel 80, the contact sensing unit 33 sends a second electrical signal to the host computer 50. After receiving the second electrical signal, the host computer 50 starts to calculate the standard pressure recovery time T.

[0101] Step S500: After the standard pressure recovery time T, the host computer 50 controls the camera 40 to take a second picture of the LCD panel 80 and obtain image B.

[0102] In step S600, the host computer 50 performs a difference comparison analysis between image B and image A to determine whether the pressure recovery of the LCD panel 80 meets the standard requirements. If it does, the LCD panel 80 is qualified; otherwise, the LCD panel 80 is unqualified.

[0103] By using the above-mentioned testing method to perform quality testing on the LCD panel 80, a high level of accuracy can be achieved, and the automated testing method results in high testing efficiency.

[0104] Specifically, in step S100, the moving coordinate parameters of the pressure application component 30 can also be set in the host computer 50 to determine the detection range of the liquid crystal panel 80. Further, the moving coordinate parameters include the driving displacement parameters of the vertical driving component 22, the driving displacement parameters of the first horizontal driving component 21, and the driving displacement parameters of the second horizontal driving component 23.

[0105] Specifically, in step S100, camera parameters can also be set in the host computer 50, including exposure value and frame rate.

[0106] Specifically, in step S300, the host computer 50 controls the vertical drive component 22 of the drive mechanism 20 to drive the pressure component 30 to move downward at a speed S. The speed S value can be adjusted according to the actual detection needs, such as 2 mm / s, and is not specifically limited here.

[0107] In this embodiment, please refer to Figure 10 As shown, the difference analysis between image B and image A includes the following steps:

[0108] Step S601: Obtain the first gray value K1 of each pixel in image B within the detection range, and obtain the second gray value K2 of each pixel in image A within the detection range. Compare the gray values ​​of each first gray value K1 and each second gray value K2 one by one.

[0109] Step S602: Count the number of pixels in image B whose difference between the first gray value K1 and the second gray value K2 is greater than the pixel gray value threshold K0, and obtain the number of unqualified pixels n. If the number of unqualified pixels n is less than or equal to the standard number of qualified pixels N, then the quality of the LCD panel 80 is qualified; otherwise, the quality of the LCD panel 80 is unqualified.

[0110] By using the above comparison method to perform difference comparison analysis between image B and image A, the recovery status of the liquid crystal panel 80 after being pressed can be accurately obtained, effectively improving the accuracy of quality inspection of the liquid crystal panel 80.

[0111] It should be noted that there are various methods for performing difference comparison analysis between image B and image A, such as image pyramid template algorithm, feature point matching algorithm, etc., which will not be specifically limited here.

[0112] Specifically, the pixel grayscale threshold K0 = (maximum grayscale value Kmax - minimum grayscale value Kmin) × 30%, where the maximum grayscale value Kmax and the minimum grayscale value Kmin are the maximum and minimum pixel grayscale values ​​of image A within the detection range, respectively, and 30% simulates the sensitivity of the human eye to the difference in pixel grayscale judgment.

[0113] Please combine Figure 11 and Figure 12 As shown, a liquid crystal panel testing method includes the following steps:

[0114] Step S100: Set the standard pressure recovery time T′ in the host computer 50;

[0115] Step S200: Power on the LCD panel 80 and turn it on. The host computer 50 controls the camera 40 to take the first picture of the LCD panel 80 and obtain image A′.

[0116] In step S300, the host computer 50 controls the drive mechanism 20 to operate. The drive mechanism 20 drives the pressure component 30 to move to the detection position of the LCD panel 80, and makes the pressure component 32 of the pressure component 30 abut against the LCD panel 80. At the same time, the contact sensing unit 33 transmits a third electrical signal to the host computer 50. After receiving the third electrical signal, the host computer 50 starts to calculate the set time t′1.

[0117] Step S400: After a set time t′1, the host computer 50 controls the drive mechanism 20 to operate. The drive mechanism 20 drives the pressure component 30 to leave the area where the LCD panel 80 is located. At the instant when the pressure component 30 separates from the LCD panel 80, the contact sensing unit 33 sends a fourth electrical signal to the host computer 50. After receiving the fourth electrical signal, the host computer 50 records the separation time between the pressure component 30 and the LCD panel 80 as t′3.

[0118] In step S500, the host computer 50 controls the camera 40 to take multiple consecutive pictures of the LCD panel 80. The shooting duration is t′4, which is greater than the standard pressure recovery time T′, and the images B′1, B′2, ..., B′n are obtained. At the same time, the host computer 50 records the shooting time of each time as Tb1, Tb2, Tb3, ..., Tbn.

[0119] In step S600, the host computer 50 compares and analyzes the differences between images B′1, B′2, ..., B′n and image A′ until an image B′ whose pressure recovery meets the standard requirements is obtained. The shooting time corresponding to image B′ is Tb′. Then, the pressure recovery time T′0 of the LCD panel 80 is equal to the shooting time Tb′ - separation time t′3 + communication delay time td. If the pressure recovery time T′0 of the LCD panel 80 is less than or equal to the standard pressure recovery time T′, then the LCD panel 80 is qualified; otherwise, the LCD panel 80 is unqualified.

[0120] The communication delay time td refers to the communication delay time of electronic components such as the contact sensing unit 33, camera 40, drive mechanism 20, and host computer 50.

[0121] By using the above-mentioned testing method to perform quality testing on the LCD panel 80, a high level of accuracy can be achieved, and the automated testing method results in high testing efficiency.

[0122] Specifically, in step S100, the moving coordinate parameters of the pressure application component 30 can also be set in the host computer 50 to determine the detection range of the liquid crystal panel 80. Further, the moving coordinate parameters include the driving displacement parameters of the vertical driving component 22, the driving displacement parameters of the first horizontal driving component 21, and the driving displacement parameters of the second horizontal driving component 23.

[0123] Specifically, in step S100, camera parameters can also be set in the host computer 50, including exposure value and frame rate.

[0124] Specifically, in step S300, the host computer 50 controls the vertical drive component 22 of the drive mechanism 20 to drive the pressure component 30 to move downward at a speed S′. The speed S′ value can be adjusted according to the actual detection needs, such as 2 mm / s, and is not specifically limited here.

[0125] Specifically, in step S500, the shooting duration t′4 is twice the standard pressure recovery time T′ to ensure that enough comparison image samples are obtained to further improve detection accuracy.

[0126] In this embodiment, please refer to Figure 9 As shown, the following steps are included when performing a difference comparison analysis between image B′1, image B′2...image B′n and image A′:

[0127] Step S601: Obtain the first gray value K′1 of each pixel in image B′n within the detection range, and obtain the second gray value K′2 of each pixel in image A′ within the detection range. Compare the gray values ​​of each first gray value K′1 and each second gray value K′2 one by one.

[0128] Step S602: Count the number of pixels in image B′n whose difference between the first gray value K′1 and the second gray value K′2 is greater than the pixel gray value threshold K′0, and obtain the number of unqualified pixels n′. If the number of unqualified pixels n′ is less than or equal to the standard number of qualified pixels N′, then record image B′n as image B′, and the shooting time corresponding to image B′ is Tb′.

[0129] By using the above comparison method to compare and analyze the differences between images B′1, B′2, ..., B′n and image A, the recovery status of the liquid crystal panel 80 after being subjected to pressure can be accurately obtained, effectively improving the accuracy of quality inspection of the liquid crystal panel 80.

[0130] It should be noted that before performing difference comparison analysis between images B′1, B′2, ..., B′n and image A, it is necessary to perform matching and localization between the images. There are various algorithms for matching and localization, such as image pyramid template algorithm, feature point matching algorithm, etc., which will not be specifically limited here.

[0131] Specifically, a pixel grayscale threshold K′0 and a standard value N′ for the number of qualified pixels are set. The pixel grayscale threshold K′0 = (maximum grayscale value K′max - minimum grayscale value K′min) × 30%, where the maximum grayscale value K′max and the minimum grayscale value K′min are the maximum and minimum pixel grayscale values ​​in the detection range of image A′, respectively, and 30% is to simulate the sensitivity of the human eye to judging differences.

[0132] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A liquid crystal panel testing device, characterized in that, include: A workbench used to place LCD panels; The drive mechanism is mounted on the worktable; The pressure application assembly includes a support mounted on the drive mechanism, a pressure application member movably supported on the support, and a contact sensing unit disposed between the support and the pressure application member. The pressure application member includes a weight portion and a pressure head disposed on the side of the weight portion near the liquid crystal panel. The support has a through hole for the pressure head to extend out. The support has a receiving cavity, the weight portion is received in the receiving cavity, and the contact sensing unit is disposed between the weight portion and the support. The pressure application member abuts against or separates from the liquid crystal panel under the drive of the drive mechanism. The camera is suspended above the LCD panel; The host computer is electrically connected to the drive mechanism, the contact sensing unit, and the camera. The pressure application assembly also includes a mounting base, through which the support member is mounted on the drive mechanism.

2. The liquid crystal panel testing device according to claim 1, characterized in that: The drive mechanism includes a first horizontal drive component and a vertical drive component. The vertical drive component is installed at the power output end of the first horizontal drive component, and the support is fixedly installed at the power output end of the vertical drive component.

3. The liquid crystal panel testing device according to claim 2, characterized in that: The first horizontal drive assembly includes a first bracket, a first motor mounted on the first bracket and electrically connected to the upper electromechanical unit, a first screw rotatably mounted on the first bracket and connected to the power output end of the first motor, and a first ball nut cooperating with the first screw. The vertical drive assembly includes a second bracket mounted on the first ball nut, a second motor mounted on the second bracket and electrically connected to the upper electromechanical unit, a second screw rotatably mounted on the second bracket and connected to the power output end of the second motor, and a second ball nut cooperating with the second screw. The support component is mounted on the second ball nut.

4. The liquid crystal panel testing device according to claim 2, characterized in that: The drive mechanism further includes a second horizontal drive component electrically connected to the upper electromechanical unit. The first horizontal drive component is installed at the power output end of the second horizontal drive component, and the drive direction of the first horizontal drive component forms an angle with the drive direction of the second horizontal drive component.

5. The liquid crystal panel testing device according to claim 4, characterized in that: The second horizontal drive assembly includes a third bracket, a third motor mounted on the third bracket and electrically connected to the upper electromechanical unit, a third screw rotatably mounted on the third bracket and connected to the power output end of the third motor, and a third ball nut cooperating with the third screw. The first horizontal drive assembly is mounted on the third ball nut.

6. The liquid crystal panel testing device according to claim 1, characterized in that: The support member includes a cylindrical body and a support plate covering an open end of the cylindrical body near the liquid crystal panel, the support plate having the through hole.

7. The liquid crystal panel testing device according to claim 1, characterized in that: The pressure-applying component also includes a flexible sleeve, which is fitted onto the pressure-applying head.

8. The liquid crystal panel testing device according to claim 7, characterized in that: The pressure head is provided with a bayonet, and the flexible sleeve is provided with a locking part that engages with the bayonet.

9. The liquid crystal panel testing apparatus according to any one of claims 1-5, characterized in that: The support member has a displacement port for connecting the accommodating cavity to the outside.

10. The liquid crystal panel testing apparatus according to any one of claims 1-5, characterized in that: The liquid crystal panel testing device also includes a clamp mounted on the worktable, which is used to fix the liquid crystal panel.

11. A liquid crystal panel testing method of a liquid crystal panel testing apparatus as described in any one of claims 1-10, characterized in that: Includes the following steps: Set the standard pressure recovery time T in the host computer; The LCD panel is powered on and lit up. The host computer controls the camera to take the first picture of the LCD panel and obtain image A. The host computer controls the operation of the drive mechanism, which drives the pressure component to move to the detection position of the LCD panel and makes the pressure component of the pressure component contact the LCD panel. At the same time, the contact sensing unit transmits a first electrical signal to the host computer. After receiving the first electrical signal, the host computer controls the drive mechanism to stop operating and starts calculating the set time t1. After the set time t1, the host computer controls the drive mechanism to operate, and the drive mechanism drives the pressure component to leave the area where the liquid crystal panel is located. At the instant when the pressure component separates from the liquid crystal panel, the contact sensing unit sends a second electrical signal to the host computer. After receiving the second electrical signal, the host computer starts to calculate the standard pressure recovery time T. After the standard pressure recovery time T, the host computer controls the camera to take a second picture of the LCD panel to obtain image B; The host computer performs a difference comparison analysis between image B and image A to determine whether the pressure recovery of the liquid crystal panel meets the standard requirements. If so, the liquid crystal panel is qualified; otherwise, the liquid crystal panel is unqualified.

12. The liquid crystal panel testing method according to claim 11, characterized in that: The difference comparison analysis between image B and image A includes the following steps: Obtain the first gray value K1 of each pixel in the detection range of image B, and obtain the second gray value K2 of each pixel in the detection range of image A, and compare the gray values ​​of each first gray value K1 and each second gray value K2 in a one-to-one correspondence. The number of pixels in image B whose difference between the first grayscale value K1 and the second grayscale value K2 is greater than the pixel grayscale threshold K0 is counted to obtain the number of unqualified pixels n. If the number of unqualified pixels n is less than or equal to the standard number of qualified pixels N, then the quality of the liquid crystal panel is qualified; otherwise, the quality of the liquid crystal panel is unqualified.

13. A liquid crystal panel testing method using a liquid crystal panel testing apparatus as described in any one of claims 1-10, characterized in that: Includes the following steps: Set the standard pressure recovery time T′ in the host computer; The LCD panel is powered on and lit up. The host computer controls the camera to take the first picture of the LCD panel and obtain image A′. The host computer controls the operation of the drive mechanism, which drives the pressure application component to move to the detection position of the LCD panel and makes the pressure application component of the pressure application component abut against the LCD panel. At the same time, the contact sensing unit transmits a third electrical signal to the host computer. After receiving the third electrical signal, the host computer controls the drive mechanism to stop operating and starts calculating the set time t′1. After the set time t′1, the host computer controls the drive mechanism to operate, and the drive mechanism drives the pressure component to leave the area where the liquid crystal panel is located. At the instant when the pressure component separates from the liquid crystal panel, the contact sensing unit sends a fourth electrical signal to the host computer. After receiving the fourth electrical signal, the host computer records the separation time of the pressure component from the liquid crystal panel as t′3. The host computer controls the camera to take multiple consecutive pictures of the LCD panel. The shooting duration is t′4, which is greater than the standard pressure recovery time T′, to obtain images B′1, B′2, ..., B′n. At the same time, the host computer records the shooting time of each shot as Tb1, Tb2, Tb3, ..., Tbn. The host computer performs difference comparison analysis between the image B′1, the image B′2, ..., the image B′n and the image A′, until an image B′ that meets the standard requirements for pressure recovery is obtained. The shooting time corresponding to the image B′ is Tb′. Then, the pressure recovery time T′0 of the liquid crystal panel is equal to the shooting time Tb′ - separation time t′3 + communication delay time td. If the pressure recovery time T′0 of the liquid crystal panel is less than or equal to the standard pressure recovery time T′, then the liquid crystal panel is of qualified quality; otherwise, the liquid crystal panel is of unqualified quality.

14. The liquid crystal panel testing method according to claim 13, characterized in that: When performing difference comparison analysis between image B′1, image B′2, ..., image B′n and image A′, the following steps are included: Obtain the first gray value K′1 of each pixel in the image B′n within the detection range, and obtain the second gray value K′2 of each pixel in the image A′ within the detection range. Compare the gray values ​​of each first gray value K′1 and each second gray value K′2 in a one-to-one correspondence. The number of pixels in the image B′n whose difference between the first gray value K′1 and the second gray value K′2 is greater than the pixel gray value threshold K′0 is counted to obtain the number of unqualified pixels n′. If the number of unqualified pixels n′ is less than or equal to the standard number of qualified pixels N′, the image B′n is recorded as image B′, and the shooting time corresponding to image B′ is Tb′.

Images