Display screen point-line mura testing device
By designing a display dotted line mura test device containing positioning unit and smoothing unit, the problem of difficult to accurately control the unloading position and FPC warping in mobile phone display test is solved, and efficient and accurate test results and production processes are achieved.
Patent Information
- Application Number
- CN202510244441.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-03
- Publication Date
- 2025-05-23
AI Technical Summary
The existing mobile phone display dotted line mura testing technology has problems such as difficult to accurately control the cutting position, FPC warping leads to unstable test signal and low manual adjustment efficiency, which affects the accuracy and production efficiency of the test.
A display dotted line Mura test device is designed, including a chassis, image pickup unit, positioning unit, smoothing unit, test unit and console. Through the precise positioning function of the positioning unit and the FPC smoothing function of the smoothing unit, precise control of the position of the display screen and FPC leveling are achieved, reducing the error detection rate.
It improves the accuracy and production efficiency of display screen testing, reduces the need for manual adjustment, reduces the error detection rate, and ensures the stability of FPC during the testing process.
Smart Images
Figure CN120028022A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of display screen detection, in particular to a display screen dot line mura testing device. Background Art
[0002] In the manufacturing process of mobile phone displays, the dot-line mura test of the API test machine is a key link to ensure product quality. Accurate test results can effectively screen out defective products and ensure the consumer experience. However, the current mobile phone display dot-line mura test technology has many problems in practical applications, which seriously affects the accuracy of the test and production efficiency.
[0003] The traditional material cutting method has large errors: Most of the existing mobile phone display screen cutting relies on simple mechanical positioning devices, such as fixed baffles and guide rails. However, due to vibrations during the production process, wear of mechanical parts, and slight differences in the size of the display itself, it is difficult to accurately control the cutting position. This causes the display screen to have a large position deviation when entering the test station, and it is impossible to ensure that the probe of the test equipment accurately corresponds to the test point of the display screen. The fixed position block will also cause damage to the inspection piece during the test when the cutting is not accurate. There is a lack of automatic positioning and adjustment mechanism. The traditional material cutting equipment is not equipped with real-time monitoring and automatic adjustment functions. Once the cutting position deviates, it can only rely on manual adjustment, which not only increases labor costs and labor intensity, but also has low efficiency in manual adjustment, making it difficult to meet the needs of large-scale production. During peak production, manual adjustment may cause the production line to stagnate, resulting in huge economic losses.
[0004] In addition, the FPC of the mobile phone display is prone to warping during production, handling and testing. FPC warping will change the electrical connection status of the display, resulting in unstable test signal transmission, which will affect the accuracy of dot and line mura detection. For example, when the FPC warping exceeds a certain degree, the test signal may be interrupted or misjudged, causing some qualified displays to be misjudged as unqualified products, increasing production costs. Summary of the invention
[0005] The object of the present invention is to provide a display screen dot line mura testing device to solve the problems raised in the prior art.
[0006] To achieve the above object, the present invention provides the following technical solutions: A display screen dot line mura testing device comprises a chassis, an imaging unit, a positioning unit, a smoothing unit, a testing unit and a control console, wherein the chassis is placed on a horizontal ground, the imaging unit is fixedly mounted on the inner surface of one end of a horizontal base of the chassis, the positioning unit is fixedly mounted on the inner surface of one end of the chassis close to the ground, the positioning unit is fixedly connected to the smoothing unit, the positioning unit is electrically connected to the testing unit, the positioning unit has a function of adjusting the position of a spot inspection film, the smoothing unit is mounted on the surface of one end of the horizontal base of the positioning unit, the smoothing unit has a function of flattening a warped FPC, the testing unit is fixedly connected to the imaging unit, and the control console is fixedly mounted on the outer surface of the chassis.
[0007] The chassis is used to install and fix the imaging unit, positioning unit, smoothing unit, test unit and console. The imaging unit is used to take pictures of the display screen and project it on the console. The positioning unit is used to adjust the unloading position of the mobile phone display screen. The smoothing unit is used to smooth the warping of the FPC. The test unit is used to detect and test the dot and line mura of the display screen. The console is used to control the entire test process of the API machine. When the robotic arm unloads the inspection film to the test site, the positioning unit accurately positions the inspection film, and then the smoothing unit smoothes the FPC to avoid warping that may cause the test unit to be unable to test accurately and reduce the false detection rate. Finally, the imaging unit images the test process of the display screen on the console screen, which is convenient for the staff to observe and adjust in time.
[0008] Furthermore, the imaging unit includes a horizontal guide rail, a driving telescopic motor 1, a vertical guide rail, a driving telescopic motor 2, a large field of view camera and a small field of view camera, the horizontal guide rail is fixedly installed on the inner surface of one end of the horizontal base of the chassis, the fixed end of the driving telescopic motor 1 is fixedly installed inside the horizontal guide rail, the telescopic end of the driving telescopic motor 1 is fixedly connected to the vertical guide rail, the fixed end of the driving telescopic motor 2 is fixedly installed inside the vertical guide rail, the telescopic end of the driving telescopic motor 2 is fixedly connected to the large field of view camera, the small field of view camera is fixedly installed on the crossbeam of the vertical guide rail, and the vertical guide rail is fixedly connected to the test unit.
[0009] The console controls the drive telescopic motor 1 to start, and drives the vertical guide rail to move to a specified distance in the horizontal guide rail. The console controls the drive telescopic motor 2 to start, and drives the large field of view camera and the small field of view camera to move downward synchronously until the large field of view camera and the small field of view camera capture a clear picture.
[0010] Furthermore, the positioning unit includes a vertical plate, a support platform, a backlight panel, a clamp, a long rod, a shaping plate and a rotating column. The vertical plate is fixedly mounted on the inner surface of one end of the chassis close to the horizontal ground, the support platform is fixedly mounted on the inner surface of one end of the chassis close to the horizontal ground, the backlight panel is fixedly mounted on the support platform, and the clamp is fixedly mounted above the backlight panel. The clamp consists of a splint, a display screen placement slot, an FPC placement slot and a PCB board placement slot. A circular through hole is provided in the FPC placement slot for vacuum adsorption and fixation of the FPC. The long rod is fixedly connected to the shaping plate, the long rod is rotatably connected to the rotating column, the rotating column is fixedly mounted on the upper surface of the splint, a circular through hole is provided at one end of the long rod close to the vertical plate, a conductive ring is provided at the circular through hole, the long rod is slidably connected to the bending rod, the conductive ring of the long rod is electrically connected to the electric telescopic rod, and the end of the long rod away from the vertical plate is fixedly connected to the smoothing unit.
[0011] Furthermore, the positioning unit also includes a deformation spring, a fixed plate, a bent rod, an electric telescopic rod, a push plate and a buffer spring, both ends of the deformation spring are fixedly connected to the long rod, the deformation spring is electrically connected to the test unit, the fixed plate is fixedly mounted on the upper surface of the splint, the fixed plate is fixedly connected to the bent rod, a driving coil is wound around the surface of the bent rod, the driving coil on the surface of the bent rod is close to one end of the electric telescopic rod as a current input end, the fixed end of the electric telescopic rod is fixedly mounted on the vertical plate, the movable end of the electric telescopic rod is fixedly connected to the push plate, and the buffer spring is fixedly connected to one end of the long rod away from the vertical plate.
[0012] When the robotic arm places the inspection piece into the display screen placement slot on the fixture, the inspection piece blocks the light source of the backlight panel, causing the photoresistor to detect a weakening of the light intensity and an increase in the resistance, thereby causing the current passed through the deformation spring by the console to gradually decrease. After the current received by the deformation spring decreases, it gradually begins to shrink, thereby driving the long rod to rotate around the rotating column. On the one hand, the long rod slides along the curved rod. At this time, the effective number of turns of the driving coil on the curved rod gradually decreases, thereby gradually increasing the current delivered to the electric telescopic rod, pushing the electric telescopic rod to extend and drive the push plate forward to position the inspection piece. The other part of the current is delivered to the first memory spring and the second memory spring in the shaping plate. After receiving the current, the first memory spring and the second memory spring extend to different lengths, thereby pushing the side of the inspection piece to move until it is in the display screen placement slot, thereby jointly achieving precise positioning of the offset inspection piece in the horizontal and vertical directions.
[0013] Furthermore, the smoothing unit includes a pull rope, a fixed column, a slide plate, an electromagnet, a first conductive plate, a second conductive plate, a hydraulic push rod, a large blocking block and a small blocking block, one end of the pull rope is fixedly connected to the end of the long rod away from the vertical plate, the other end of the pull rope passes around the fixed column and is fixedly connected to the slide plate, the fixed column is fixedly mounted on the clamping plate, the slide plate is made of iron, the slide plate is slidably mounted in a groove opened in the large blocking block, the electromagnet is fixedly mounted in the groove opened in the large blocking block, the first conductive plate is fixedly mounted on the end of the large blocking block close to the long rod, the second conductive plate is fixedly mounted on the end of the large blocking block away from the long rod, the first conductive plate is electrically connected to the hydraulic push rod, the fixed end of the hydraulic push rod is slidably mounted in the groove opened in the large blocking block, the large blocking block is fixedly mounted on the clamping plate, an electric spring telescopic rod is arranged in the groove of the large blocking block, the fixed end of the hydraulic push rod is fixedly connected to the movable part of the electric spring telescopic rod, the second conductive plate is electrically connected to the electric spring telescopic rod, and the small blocking block is fixedly mounted on the clamping plate.
[0014] On the other hand, when the long rod rotates and the stretching buffer spring is extended, under the action of the pull rope, the pull rope is pulled around the fixed column to pull the slide plate to move along the groove of the large blocking block. When the slide plate moves, the slide plate pushes the offset inspection piece into the display screen placement groove to position the offset inspection piece. When the slide plate moves to contact the first conductive plate and the second conductive plate, on the one hand, the current of the slide plate is transmitted to the hydraulic push rod through the first conductive plate, thereby controlling the hydraulic push rod to start extending and pressing on the root of the FPC. On the other hand, the current of the slide plate is transmitted to the electric spring telescopic rod through the second conductive plate, thereby controlling the electric spring telescopic rod to pull the hydraulic push rod downward. In the process of the hydraulic push rod moving downward, the warped FPC is smoothed in the FPC placement groove between the large blocking block and the small blocking block. During the movement of the hydraulic push rod, the toggle switch is pushed to start, so that the console is vacuumed from the round hole in the FPC placement groove, and the FPC is firmly adsorbed in the FPC placement groove, reducing the situation of false detection of the display screen test process due to FPC warping, thereby improving the test accuracy of the display screen, and during the resetting process, the slide plate is reset under the action of the attraction of the electromagnet.
[0015] Furthermore, the test unit includes a mounting table, a slide groove, an electric push rod, a pressure head and a photoresistor. The mounting table is fixedly connected to the vertical guide rail. A slide groove is provided on the mounting table. The fixed end of the electric push rod is fixedly installed on the inner wall of the slide groove away from the horizontal ground. The movable end of the electric push rod is fixedly connected to the pressure head. A photoresistor is fixedly installed on the end of the pressure head close to the horizontal ground. The photoresistor is electrically connected to the deformation spring.
[0016] After completing the positioning of the inspection piece and the warping smoothing of the FPC, the end of the FPC is at the PCB test area on the PCB placement slot. The console controls the electric push rod on the mounting table to start, thereby driving the pressure head to move down along the slide slot and perform a press test on the FPC. After the test is completed, the console analyzes whether the point and line mura problem of the inspection piece is accurate.
[0017] Furthermore, the length of the push plate is greater than the width of the display screen placement slot.
[0018] In order to achieve comprehensive push correction of the inaccurate display screen inspection piece, ensure that the display screen can be subjected to uniform thrust in the entire width direction, so as to accurately push it to the predetermined position of the placement slot, adapt to different deviation conditions, and prevent secondary offset of the inspection piece.
[0019] Furthermore, a plurality of groups of toggle switches are arranged on the side of one end of the small blocking block close to the large blocking block.
[0020] In order to make the hydraulic push rod move forward to smooth the warped FPC, the smoothed part is gradually moved with the help of the hydraulic push rod to push the toggle switch to start the vacuum adsorption of the FPC below, ensuring that the FPC will not shift during the test, resulting in damage caused by inaccurate measurement and inaccurate FPC pressing position.
[0021] Furthermore, the shaping plate is a hollow structure, and a first memory spring and a second memory spring are built into both ends of the shaping plate. The deformation of the first memory spring is smaller than that of the second memory spring. In the horizontal direction, the first memory spring and the second memory spring push the push plate to move and are always parallel to the display screen placement slot. The conductive rings of the long rod are electrically connected to the first memory spring and the second memory spring.
[0022] In order to ensure that the push plate always remains parallel to the side of the display screen placement slot during its movement, the push plate that moves in parallel can ensure comprehensive and uniform contact with the side of the display screen when it approaches the display screen. Because the push plate is parallel to the slot, the entire side of the display screen can be subjected to the same thrust during the pushing process, thus avoiding the large impact force generated when the push plate contacts the display screen at a non-parallel angle, which could damage the display screen and facilitates the positioning and calibration of the display screen.
[0023] Furthermore, the large blocking block and the small blocking block are provided with rounded corners.
[0024] In order to allow the warped FPC to smoothly enter the FPC placement slot from the rounded corners of the large and small blocking blocks during the positioning process, it is convenient for the subsequent smoothing unit to smooth the FPC, thereby effectively improving the accuracy of the test.
[0025] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention detects that the light intensity becomes weaker through a photoresistor, and the deformable spring gradually begins to shrink after the current received by it becomes smaller. The long rod slides around the bent rod, so that the effective number of turns of the driving coil on the bent rod gradually decreases, thereby gradually increasing the current delivered to the electric telescopic rod, pushing the push plate forward to position the inspection piece, and another part of the current is delivered to the first memory spring and the second memory spring in the shaping plate. After receiving the current, the first memory spring and the second memory spring are extended to different lengths, thereby pushing the side of the inspection piece to move until it is placed in the display screen placement slot, thereby jointly realizing the precise positioning of the offset inspection piece in the horizontal and vertical directions.
[0026] 2. The present invention, on the other hand, pulls the slide plate to move along the groove of the large blocking block under the action of the pull rope when the long rod rotates, so as to position the offset inspection piece. When the slide plate moves to contact the first conductive plate and the second conductive plate, on the one hand, the current of the slide plate is transmitted to the hydraulic push rod through the first conductive plate, thereby controlling the hydraulic push rod to start extending and pressing on the root of the FPC. On the other hand, the current of the slide plate is transmitted to the electric spring telescopic rod through the second conductive plate, thereby controlling the electric spring telescopic rod to pull the hydraulic push rod to move downward. In the process of the hydraulic push rod moving downward, the warped FPC is smoothed. During the movement of the hydraulic push rod, the toggle switch is pushed to start, so that the console is vacuumed from the round hole in the FPC placement groove, and the FPC is firmly adsorbed in the FPC placement groove, thereby reducing the situation of misdetection in the display screen test process due to FPC warping, thereby improving the test accuracy of the display screen.
[0027] 3. The push plate of the present invention always keeps parallel with the side of the display screen placement groove during its movement. When the push plate moves in parallel, it can ensure full and uniform contact with the side of the display screen. Because the push plate is parallel to the groove, the entire side of the display screen can be subjected to the same thrust during the pushing process, thereby avoiding a large impact force generated when the push plate contacts the display screen at a non-parallel angle, thereby causing damage to the display screen, and facilitating the positioning and calibration of the display screen. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 This is a schematic diagram of the overall appearance structure of a display screen point line mura testing device of the present invention; Figure 2 A schematic diagram of the internal structure of a chassis of a display screen point line mura testing device according to the present invention; Figure 3 A display screen point line mura testing device according to the present invention Figure 2 Another perspective structural diagram; Figure 4 A display screen point line mura testing device according to the present invention Figure 3 A schematic diagram of the structure of the partial enlarged view at center A; Figure 5 This is a schematic diagram of the overall appearance structure of an imaging unit of a display screen point line mura testing device according to the present invention; Figure 6 A schematic diagram of the photoresistor installation position structure of a display screen point line mura testing device according to the present invention; Figure 7 This is a schematic diagram of the installation position structure of a positioning unit and a smoothing unit of a display screen point line mura testing device of the present invention; Figure 8 A display screen point line mura testing device according to the present invention Figure 7 The structural schematic diagram of the partial enlarged view at B in the middle; Fig. 9 A display screen point line mura testing device according to the present invention Figure 8 The structural schematic diagram of the partial enlarged view at C in the middle; Fig.10 A display screen point line mura testing device according to the present invention Figure 7 Another perspective structural diagram; Fig.11 A display screen point line mura testing device according to the present invention Fig.10 The structural schematic diagram of the local enlarged view at D in the middle; Fig.12 A display screen point line mura testing device according to the present invention Fig.10 Schematic diagram of the structure of the partial enlarged view at point E in the middle.
[0029] In the figure: 1, chassis; 2, image acquisition unit; 21, horizontal guide rail; 22, drive telescopic motor 1; 23, vertical guide rail; 24, drive telescopic motor 2; 25, large field of view camera; 26, small field of view camera; 3, positioning unit; 31, vertical plate; 32, support table; 33, backlight plate; 34, fixture; 341, clamp; 342, display screen placement slot; 343, FPC placement slot; 344, PCB board placement slot; 35, long rod; 36, shaping plate; 37, rotating column; 38, Deformation spring; 39, fixed plate; 310, bending rod; 311, electric telescopic rod; 312, push plate; 313, buffer spring; 4, smoothing unit; 41, pull rope; 42, fixed column; 43, slide plate; 44, electromagnet; 45, first conductive plate; 46, second conductive plate; 47, hydraulic push rod; 48, large blocking block; 49, small blocking block; 5, test unit; 51, mounting table; 52, slide trough; 53, electric push rod; 54, pressure head; 55, photoresistor; 6, control console. DETAILED DESCRIPTION
[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0031] Example: Figure 1-Figure 12 As shown, the present invention provides a technical solution: like Figure 1 , Figure 2 As shown, a display screen dot line mura testing device includes a chassis 1, an imaging unit 2, a positioning unit 3, a smoothing unit 4, a testing unit 5 and a control console 6. The chassis 1 is placed on a horizontal ground, the imaging unit 2 is fixedly mounted on the inner surface of one end of a horizontal base of the chassis 1, the positioning unit 3 is fixedly mounted on the inner surface of one end of the chassis 1 close to the ground, the positioning unit 3 is fixedly connected to the smoothing unit 4, the positioning unit 3 is electrically connected to the testing unit 5, the positioning unit 3 has a function of adjusting the position of the spot inspection film, the smoothing unit 4 is mounted on the surface of one end of the horizontal base of the positioning unit 3, the smoothing unit 4 has the function of flattening the warped FPC, the testing unit 5 is fixedly connected to the imaging unit 2, and the control console 6 is fixedly mounted on the outer surface of the chassis 1.
[0032] The chassis 1 is used to install and fix the imaging unit 2, the positioning unit 3, the smoothing unit 4, the testing unit 5 and the control console 6. The imaging unit 2 is used to take a photo of the display screen projected on the control console 6. The positioning unit 3 is used to adjust the unloading position of the mobile phone display screen. The smoothing unit 4 is used to smooth the warping of the FPC. The testing unit 5 is used for the detection and testing of the dot-line mura of the display screen. The control console 6 is used to control the entire testing process of the API machine. When the robotic arm unloads the inspection film to the testing location, the positioning unit 3 accurately positions the inspection film, and then the smoothing unit 4 smoothes the FPC to avoid warping that causes the testing unit 5 to be unable to test accurately, thereby reducing the false detection rate. Finally, the testing process of the display screen is imaged on the display screen of the control console 6 through the imaging unit 2, which is convenient for the staff to observe and adjust in real time.
[0033] like Figure 5As shown, the imaging unit 2 includes a horizontal guide rail 21, a driving telescopic motor 1 22, a vertical guide rail 23, a driving telescopic motor 24, a large field of view camera 25 and a small field of view camera 26. The horizontal guide rail 21 is fixedly mounted on the inner surface of one end of the horizontal base of the chassis 1, the fixed end of the driving telescopic motor 1 22 is fixedly mounted inside the horizontal guide rail 21, the telescopic end of the driving telescopic motor 1 22 is fixedly connected to the vertical guide rail 23, the fixed end of the driving telescopic motor 24 is fixedly mounted inside the vertical guide rail 23, the telescopic end of the driving telescopic motor 24 is fixedly connected to the large field of view camera 25, the small field of view camera 26 is fixedly mounted on the crossbeam of the vertical guide rail 23, and the vertical guide rail 23 is fixedly connected to the test unit 5.
[0034] The console 6 controls the telescopic motor 1 22 to start, and drives the vertical guide rail 23 to move to a specified distance in the horizontal guide rail 21. Then, the console 6 controls the telescopic motor 24 to start, and drives the large field of view camera 25 and the small field of view camera 26 to move downward synchronously until the large field of view camera 25 and the small field of view camera 26 capture a clear picture.
[0035] like Figure 3 , Figure 7 , Figure 8 , Fig.11 As shown, the positioning unit 3 includes a vertical plate 31, a support platform 32, a backlight panel 33, a clamp 34, a long rod 35, a shaping plate 36 and a rotating column 37. The vertical plate 31 is fixedly mounted on the inner surface of the chassis 1 at one end close to the horizontal ground, the support platform 32 is fixedly mounted on the inner surface of the chassis 1 at one end close to the horizontal ground, the backlight panel 33 is fixedly mounted on the support platform 32, and the clamp 34 is fixedly mounted above the backlight panel 33. The clamp 34 consists of a clamp 341, a display placement slot 342, an FPC placement slot 343 and a PCB board placement slot 344. The composition is as follows: a circular through hole is provided in the FPC placement groove 343 for vacuum adsorption and fixation of the FPC, the long rod 35 is fixedly connected to the shaping plate 36, the long rod 35 is rotatably connected to the rotating column 37, the rotating column 37 is fixedly installed on the upper surface of the clamping plate 341, a circular through hole is provided at one end of the long rod 35 close to the vertical plate 31, a conductive ring is provided at the circular through hole, the long rod 35 is slidably connected to the bending rod 310, the conductive ring of the long rod 35 is electrically connected to the electric telescopic rod 311, and the end of the long rod 35 away from the vertical plate 31 is fixedly connected to the smoothing unit 4.
[0036] like Figure 8 , Fig.11As shown, the positioning unit 3 also includes a deformation spring 38, a fixed plate 39, a bent rod 310, an electric telescopic rod 311, a push plate 312 and a buffer spring 313. Both ends of the deformation spring 38 are fixedly connected to the long rod 35, and the deformation spring 38 is electrically connected to the test unit 5. The fixed plate 39 is fixedly installed on the upper surface of the clamping plate 341, and the fixed plate 39 is fixedly connected to the bent rod 310. A driving coil is wound around the surface of the bent rod 310, and the driving coil on the surface of the bent rod 310 is close to the electric telescopic rod 311. One end is the current input end, and the fixed end of the electric telescopic rod 311 is fixedly installed on the vertical plate 31. The movable end of the electric telescopic rod 311 is fixedly connected to the push plate 312, and the buffer spring 313 is fixedly connected to the end of the long rod 35 away from the vertical plate 31.
[0037] When the robot arm puts the inspection sheet into the display screen placement slot 342 on the clamp 34, the inspection sheet blocks the light source of the backlight panel 33, causing the photoresistor 55 to detect that the light intensity becomes weaker and the resistance becomes larger, thereby causing the current passed into the deformation spring 38 by the console 6 to gradually decrease. After the current received by the deformation spring 38 becomes smaller, it gradually begins to shrink, thereby driving the long rod 35 to rotate around the rotating column 37. On the one hand, the long rod 35 slides along the curved rod 310. At this time, the effective number of turns of the driving coil on the curved rod 310 gradually decreases, thereby gradually increasing the current delivered to the electric telescopic rod 311, pushing the electric telescopic rod 311 to extend and drive the push plate 312 to push forward to position the inspection sheet. Another part of the current is delivered to the first memory spring and the second memory spring in the shaping plate 36. After receiving the current, the first memory spring and the second memory spring are extended to different lengths, thereby pushing the side of the inspection sheet to move until it is in the display screen placement slot 342, thereby jointly achieving precise positioning of the offset inspection sheet in the horizontal and vertical directions.
[0038] like Figure 8 , Fig. 9 , Fig.12As shown, the smoothing unit 4 includes a pull rope 41, a fixed column 42, a slide plate 43, an electromagnet 44, a first conductive plate 45, a second conductive plate 46, a hydraulic push rod 47, a large blocking block 48 and a small blocking block 49. One end of the pull rope 41 is fixedly connected to the end of the long rod 35 away from the vertical plate 31, and the other end of the pull rope 41 passes around the fixed column 42 and is fixedly connected to the slide plate 43. The fixed column 42 is fixedly installed on the clamping plate 341. The slide plate 43 is made of iron. The slide plate 43 is slidably installed in the groove opened in the large blocking block 48. The electromagnet 44 is fixedly installed in the groove opened in the large blocking block 48. The first conductive plate 45 is fixedly installed in the groove opened in the large blocking block 48. The first conductive plate 45 is electrically connected to the hydraulic push rod 47, and the fixed end of the hydraulic push rod 47 is slidably installed in the groove formed in the large blocking block 48. The large blocking block 48 is fixedly installed on the clamping plate 341. An electric spring telescopic rod is arranged in the groove of the large blocking block 48. The fixed end of the hydraulic push rod 47 is fixedly connected to the movable part of the electric spring telescopic rod. The second conductive plate 46 is electrically connected to the electric spring telescopic rod. The small blocking block 49 is fixedly installed on the clamping plate 341.
[0039] On the other hand, when the long rod 35 rotates and the tension buffer spring 313 is extended, under the action of the pull rope 41, the pull rope 41 pulls the slide plate 43 around the fixed column 42 to move along the groove of the large blocking block 48. When the slide plate 43 moves, the slide plate 43 pushes the offset inspection piece into the display screen placement groove 342 to position the offset inspection piece. When the slide plate 43 moves to contact the first conductive plate 45 and the second conductive plate 46, on the one hand, the current of the slide plate 43 is transmitted to the hydraulic push rod 47 through the first conductive plate 45, thereby controlling the hydraulic push rod 47 to start extending and press on the root of the FPC. On the other hand, the current of the slide plate 43 is transmitted to the second conductive plate 46 through the second conductive plate The electric spring telescopic rod controls the electric spring telescopic rod to pull the hydraulic push rod 47 to move downward. During the downward movement of the hydraulic push rod 47, the warped FPC is smoothed in the FPC placement groove 343 between the large blocking block 48 and the small blocking block 49. During the movement of the hydraulic push rod 47, the toggle switch is pushed to start, so that the console 6 is vacuumed from the round hole in the FPC placement groove 343, and the FPC is firmly adsorbed in the FPC placement groove 343, reducing the situation of misdetection in the display screen test process due to FPC warping, thereby improving the test accuracy of the display screen, and during the resetting process, the slide plate 43 is reset under the action of the attraction of the electromagnet 44.
[0040] like Figure 4 , Figure 6As shown, the test unit 5 includes a mounting platform 51, a slide groove 52, an electric push rod 53, a pressure head 54 and a photoresistor 55. The mounting platform 51 is fixedly connected to the vertical guide rail 23. A slide groove 52 is provided on the mounting platform 51. The fixed end of the electric push rod 53 is fixedly installed on the inner wall of the slide groove 52 away from the horizontal ground. The movable end of the electric push rod 53 is fixedly connected to the pressure head 54. A photoresistor 55 is fixedly installed on the end of the pressure head 54 close to the horizontal ground. The photoresistor 55 is electrically connected to the deformation spring 38.
[0041] After completing the positioning of the inspection piece and the warping smoothing of the FPC, the end of the FPC is at the PCB board test area on the PCB board placement slot 344, and the console 6 controls the electric push rod 53 on the mounting table 51 to start, thereby driving the pressure head 54 to move downward along the slide slot 52 and perform a press test on the FPC. After the test is completed, the console 6 analyzes whether the point and line mura problem of the inspection piece is accurate.
[0042] like Figure 7 , Figure 8 As shown, the length of the push plate 312 is greater than the width of the display screen placement slot 342 .
[0043] In order to achieve comprehensive push correction of the inaccurate display screen inspection piece, ensure that the display screen can be subjected to uniform thrust in the entire width direction, so as to accurately push it to the predetermined position of the placement slot, adapt to different deviation conditions, and prevent secondary offset of the inspection piece.
[0044] like Fig.12 As shown, a plurality of groups of toggle switches are arranged on the side of the small blocking block 49 close to one end of the large blocking block 48 .
[0045] In order to make the hydraulic push rod 47 move forward to smooth the warped FPC, the smoothed part is gradually smoothed by cooperating with the hydraulic push rod 47 to push the toggle switch to start controlling the vacuum adsorption of the FPC below, ensuring that the FPC will not shift during the test, resulting in damage caused by inaccurate measurement and inaccurate FPC pressing position.
[0046] like Figure 7 , Figure 8 As shown, the shaping plate 36 is a hollow structure, and the first memory spring and the second memory spring are built into both ends of the shaping plate 36. The deformation of the first memory spring is smaller than that of the second memory spring. In the horizontal direction, the first memory spring and the second memory spring push the push plate 312 to move and are always parallel to the display screen placement groove 342. The conductive rings of the long rod 35 are electrically connected to the first memory spring and the second memory spring.
[0047] In order to ensure that the push plate 312 always remains parallel to the side of the display screen placement groove 342 during its movement, the parallel moving push plate 312 can ensure comprehensive and uniform contact with the side of the display screen when approaching the display screen. Because the push plate 312 is parallel to the groove, the entire side of the display screen can be subjected to the same thrust during the pushing process, thereby avoiding the push plate 312 from generating a large impact force when the angle of contact with the display screen is not parallel, thereby causing damage to the display screen, and facilitating the positioning and calibration of the display screen.
[0048] like Fig. 9 , Fig.12 As shown, the large blocking block 48 and the small blocking block 49 are provided with rounded corners.
[0049] In order to allow the warped FPC to smoothly enter the FPC placement groove 343 from the rounded corners of the large blocking block 48 and the small blocking block 49 during the positioning process, it is convenient for the subsequent smoothing unit 4 to smooth the FPC, thereby effectively improving the accuracy of the test.
[0050] Working principle of the present invention: The console 6 controls the telescopic motor 1 22 to start, and drives the vertical guide rail 23 to move to a specified distance in the horizontal guide rail 21. Then, the console 6 controls the telescopic motor 24 to start, and drives the large field of view camera 25 and the small field of view camera 26 to move downward synchronously until the large field of view camera 25 and the small field of view camera 26 capture a clear picture.
[0051] When the robot arm puts the inspection sheet into the display screen placement slot 342 on the fixture 34, the inspection sheet blocks the light source of the backlight panel 33, causing the photoresistor 55 to detect that the light intensity is getting weaker and the resistance is getting larger, so that the current passed into the deformation spring 38 by the console 6 gradually decreases. After the current received by the deformation spring 38 decreases, it gradually begins to shrink, thereby driving the long rod 35 to rotate around the rotating column 37. On the one hand, the long rod 35 slides along the curved rod 310. At this time, the effective number of turns of the driving coil on the curved rod 310 gradually decreases, so that the current delivered to the electric telescopic rod 311 gradually increases, driving the electric telescopic rod 311 to rotate. The extension of the rod 311 drives the push plate 312 to push forward to position the inspection piece, and another part of the current is transmitted to the first memory spring and the second memory spring in the shaping plate 36. After receiving the current, the first memory spring and the second memory spring extend to different lengths, thereby pushing the side of the inspection piece to move until it is placed in the display screen placement slot 342, thereby jointly achieving accurate positioning of the offset inspection piece in the horizontal and vertical directions. On the other hand, when the long rod 35 rotates to stretch the buffer spring 313 to extend, under the action of the pull rope 41, the pull rope 41 pulls the slide plate 43 along the fixed column 42 The slide plate 43 moves along the groove of the large blocking block 48. When the slide plate 43 moves, the slide plate 43 pushes the offset spot inspection piece into the display screen placement groove 342 to position the offset spot inspection piece. When the slide plate 43 moves to contact the first conductive plate 45 and the second conductive plate 46, on the one hand, the current of the slide plate 43 is transmitted to the hydraulic push rod 47 through the first conductive plate 45, thereby controlling the hydraulic push rod 47 to start extending and press on the root of the FPC. On the other hand, the current of the slide plate 43 is transmitted to the electric spring telescopic rod through the second conductive plate 46, thereby controlling the electric spring telescopic rod to pull the hydraulic push rod 47. When the hydraulic push rod 47 moves downward, the warped FPC is flattened in the FPC placement groove 343 between the large blocking block 48 and the small blocking block 49. When the hydraulic push rod 47 moves, the toggle switch is pushed to start, so that the console 6 is vacuumed from the round hole in the FPC placement groove 343, and the FPC is firmly adsorbed in the FPC placement groove 343, thereby reducing the misdetection of the display screen test process due to the warping of the FPC, thereby improving the test accuracy of the display screen. During the resetting process, the slide plate 43 is reset under the action of the attraction of the electromagnet 44.
[0052] After completing the positioning of the inspection piece and the warping smoothing of the FPC, the end of the FPC is at the PCB board test area on the PCB board placement slot 344, and the console 6 controls the electric push rod 53 on the mounting table 51 to start, thereby driving the pressure head 54 to move downward along the slide slot 52 and perform a press test on the FPC. After the test is completed, the console 6 analyzes whether the point and line mura problem of the inspection piece is accurate.
[0053] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.
Claims
1. A display screen dot line mura testing device, characterized by: A display screen dot line mura testing device comprises a chassis (1), an imaging unit (2), a positioning unit (3), a smoothing unit (4), a testing unit (5) and a control console (6); the chassis (1) is placed on a horizontal ground; the imaging unit (2) is fixedly mounted on the inner surface of one end of a horizontal base of the chassis (1); the positioning unit (3) is fixedly mounted on the inner surface of one end of the chassis (1) close to the ground; the positioning unit (3) is fixedly connected to the smoothing unit (4); the positioning unit (3) is electrically connected to the testing unit (5); the positioning unit (3) has a function of adjusting the position of a spot inspection film; the smoothing unit (4) is mounted on the surface of one end of the horizontal base of the positioning unit (3); the smoothing unit (4) has a function of flattening a warped FPC; the testing unit (5) is fixedly connected to the imaging unit (2); and the control console (6) is fixedly mounted on the outer surface of the chassis (1).
2. A display screen dot line mura testing device according to claim 1, characterized in that: The imaging unit (2) comprises a horizontal guide rail (21), a first drive telescopic motor (22), a vertical guide rail (23), a second drive telescopic motor (24), a large field of view camera (25) and a small field of view camera (26); the horizontal guide rail (21) is fixedly mounted on the inner surface of one end of a horizontal base of the chassis (1); the first drive telescopic motor (22) has a fixed end fixedly mounted inside the horizontal guide rail (21); the first drive telescopic motor (22) has a telescopic end fixedly connected to the vertical guide rail (23); the second drive telescopic motor (24) has a fixed end fixedly mounted inside the vertical guide rail (23); the second drive telescopic motor (24) has a telescopic end fixedly connected to the large field of view camera (25); the small field of view camera (26) is fixedly mounted on a crossbeam of the vertical guide rail (23); and the vertical guide rail (23) is fixedly connected to the test unit (5).
3. A display screen dot line mura testing device according to claim 1, characterized in that: The positioning unit (3) comprises a vertical plate (31), a support platform (32), a backlight panel (33), a clamp (34), a long rod (35), a shaping plate (36) and a rotating column (37); the vertical plate (31) is fixedly mounted on the inner surface of one end of the chassis (1) close to the horizontal ground; the support platform (32) is fixedly mounted on the inner surface of one end of the chassis (1) close to the horizontal ground; the backlight panel (33) is fixedly mounted on the support platform (32); the clamp (34) is fixedly mounted above the backlight panel (33); the clamp (34) comprises a clamp (341), a display screen placement slot (342), an FPC placement slot (343) and a PCB board placement slot (344). 4), the FPC placement groove (343) is provided with a circular through hole for vacuum adsorption and fixation of the FPC, the long rod (35) is fixedly connected to the shaping plate (36), the long rod (35) is rotatably connected to the rotating column (37), the rotating column (37) is fixedly installed on the upper surface of the clamping plate (341), the long rod (35) is provided with a circular through hole at one end close to the vertical plate (31), a conductive ring is provided at the circular through hole, the long rod (35) is slidably connected to the bending rod (310), the conductive ring of the long rod (35) is electrically connected to the electric telescopic rod (311), and the long rod (35) is fixedly connected to the smoothing unit (4) at one end away from the vertical plate (31).
4. A display screen dot line mura testing device according to claim 3, characterized in that: The positioning unit (3) further comprises a deformation spring (38), a fixed plate (39), a bent rod (310), an electric telescopic rod (311), a push plate (312) and a buffer spring (313); both ends of the deformation spring (38) are fixedly connected to the long rod (35); the deformation spring (38) is electrically connected to the test unit (5); the fixed plate (39) is fixedly mounted on the upper surface of the clamping plate (341); the fixed plate (39) is fixedly connected to the bent rod (310); a driving coil is wound around the surface of the bent rod (310); the end of the driving coil on the surface of the bent rod (310) close to the electric telescopic rod (311) is a current input end; the fixed end of the electric telescopic rod (311) is fixedly mounted on the vertical plate (31); the movable end of the electric telescopic rod (311) is fixedly connected to the push plate (312); and the buffer spring (313) is fixedly connected to the end of the long rod (35) away from the vertical plate (31).
5. A display screen dot line mura testing device according to claim 3, characterized in that: The smoothing unit (4) comprises a pull rope (41), a fixed column (42), a slide plate (43), an electromagnet (44), a first conductive plate (45), a second conductive plate (46), a hydraulic push rod (47), a large blocking block (48) and a small blocking block (49); one end of the pull rope (41) is fixedly connected to an end of the long rod (35) away from the vertical plate (31); the other end of the pull rope (41) bypasses the fixed column (42) and is fixedly connected to the slide plate (43); the fixed column (42) is fixedly mounted on the clamping plate (341); the slide plate (43) is made of iron; the slide plate (43) is slidably mounted in a groove opened in the large blocking block (48); the electromagnet (44) is fixedly mounted in a groove opened in the large blocking block (48); the first conductive plate (45) is fixedly mounted in a groove opened in the large blocking block (48); The electric plate (45) is fixedly mounted on an end of the large blocking block (48) close to the long rod (35); the second conductive plate (46) is fixedly mounted on an end of the large blocking block (48) away from the long rod (35); the first conductive plate (45) is electrically connected to a hydraulic push rod (47); a fixed end of the hydraulic push rod (47) is slidably mounted in a groove formed in the large blocking block (48); the large blocking block (48) is fixedly mounted on a clamping plate (341); an electric spring telescopic rod is arranged in the groove of the large blocking block (48); the fixed end of the hydraulic push rod (47) is fixedly connected to a movable portion of the electric spring telescopic rod; the second conductive plate (46) is electrically connected to the electric spring telescopic rod; and the small blocking block (49) is fixedly mounted on the clamping plate (341).
6. A display screen dot line mura testing device according to claim 2, characterized in that: The test unit (5) comprises a mounting platform (51), a slide groove (52), an electric push rod (53), a pressure head (54) and a photoresistor (55). The mounting platform (51) is fixedly connected to the vertical guide rail (23). The mounting platform (51) is provided with a slide groove (52). The fixed end of the electric push rod (53) is fixedly mounted on the inner wall of the slide groove (52) away from the horizontal ground. The movable end of the electric push rod (53) is fixedly connected to the pressure head (54). The photoresistor (55) is fixedly mounted on the end of the pressure head (54) close to the horizontal ground. The photoresistor (55) is electrically connected to the deformation spring (38).
7. A display screen dot line mura testing device according to claim 4, characterized in that: The length of the push plate (312) is greater than the width of the display screen placement slot (342).
8. A display screen dot line mura testing device according to claim 5, characterized in that: A plurality of groups of toggle switches are arranged on the side of one end of the small blocking block (49) close to the large blocking block (48).
9. A display screen dot line mura testing device according to claim 3, characterized in that: The shaping plate (36) is a hollow structure, and a first memory spring and a second memory spring are built into the two ends of the shaping plate (36). The deformation of the first memory spring is smaller than that of the second memory spring. In the horizontal direction, the first memory spring and the second memory spring push the push plate (312) to move so as to always be parallel to the display screen placement groove (342), and the conductive rings of the long rod (35) are electrically connected to the first memory spring and the second memory spring.
10. A display screen dot line mura testing device according to claim 5, characterized in that: The large blocking block (48) and the small blocking block (49) are provided with rounded corners.