A detecting device of gradient density grid of touch screen

Abstract

The application discloses a kind of detection device of gradient density grid of touch screen, belong to electric mathematical data processing technical field, the detection device and method of gradient density grid of this touch screen, including limiting frame, the limiting frame is detachably installed at plug-in frame, the limiting frame includes the top strip and bottom strip of all-enclosing structure, the top strip and bottom strip opposite side are provided with mounting groove, the mounting groove is used to clamp the substrate portion of touch screen.The application is arranged by rack, limiting frame, trigger component and indicator plate, the touch screen is centrally arranged in trigger component opposite position, the trigger component is touched indicator plate by moving, test contact is generated on touch screen, and the contact position coordinates provided by touch screen are compared with the actual position coordinates of trigger component, accurate touch test is realized, while using trigger component and indicator plate to test the brightness of different positions of touch screen, shorten test procedure, improve test efficiency.

Description

Technical Field

[0001] This invention belongs to the field of electrical mathematical data processing technology, specifically relating to a device for detecting the gradient density grid of a touch screen. Background Technology

[0002] Capacitive touchscreens are a type of touchscreen and are common digital converters that can convert received touch signals into electrical signals for interactive control of actuators. During the factory testing of capacitive touchscreens, error correction is required to ensure touch accuracy.

[0003] A Chinese invention patent with publication number CN112882879A discloses a method, apparatus, and storage medium for detecting a touchscreen. The method involves receiving a detection signal transmitted at a preset frequency; acquiring the current signal quantity generated by the touchscreen based on the detection signal; and generating a detection result based on the current signal quantity. The detection result indicates whether the touchscreen exhibits an anomaly under the detection signal. This method allows for automated testing by sending a detection signal to induce a change in the touchscreen's signal quantity, and then obtaining a detection result based on the current signal quantity. This reduces labor costs. However, in practical use, touch accuracy testing of touch screens does not involve uniformly touching the entire screen. Instead, it requires accuracy testing of the edges, especially the corners, because the corners are more prone to failure than the center due to mechanical stress during production, transportation, and installation. Therefore, existing testing methods cannot perform targeted testing on these vulnerable areas, leading to missed detections during touch screen error correction and affecting the success rate of testing. In view of this, a detection device and method for gradient density grids of touch screens are provided. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a device and method for detecting the gradient density grid of a touch screen.

[0005] The technical solution adopted to solve the above technical problems is: A device for detecting gradient density grids in a touchscreen, comprising: A frame, wherein an upward-opening insert frame is formed at the top of the frame; A limiting frame is detachably installed at the insertion frame. The limiting frame includes a top strip and a bottom strip with a fully enclosed structure. The top strip and the bottom strip have mounting grooves on opposite sides. The mounting grooves are used to hold the base plate portion of the touch screen. The vertical sidewalls of the top strip and the bottom strip at the screen portion of the touch screen have recessed grooves. An indicator plate is detachably installed in a slot. The indicator plate includes a backing film. A receiving slot is opened on the side of the backing film facing the touch screen. A conductive stepped density grid is installed on the bottom surface of the receiving slot. A stepped density test target is installed on the side of the backing film facing away from the touch screen. A triggering component is mounted in front of the indicator panel via a power arm. The triggering component includes a contact that can be driven to move vertically toward and away from the touch screen. The triggering component also includes a photosensitive module positioned facing the touch screen.

[0006] Furthermore, a support seat is fixedly installed on the vertical side wall of the insert frame, and the top strip and bottom strip are equipped with lugs opposite the support seat. An installation gap is left between the vertical side wall of the support seat and the vertical side wall of the insert frame.

[0007] The above technical solution discloses a specific detachable installation structure. The support ear extends horizontally away from the touch screen and is installed from top to bottom in the installation gap left between the vertical side wall of the support base and the vertical side wall of the insertion frame. After installation, the front and rear directions of the touch screen are not blocked by fixing, and the movement of the trigger component will not be hindered. When disassembling, the upper limit bracket can be lifted to separate it from the frame, making the operation of replacing the touch screen faster.

[0008] Furthermore, both the top strip and the bottom strip adopt a segmented structure in the middle. The top strip and the bottom strip are provided with pins at the segmentation points. The top strip and the bottom strip extend perpendicularly to each other at the ends away from the pins. The mounting groove completely covers the entire top strip and the bottom strip.

[0009] The above technical solution enables faster centering of touchscreens. A special tooling is designed specifically for the size of the touchscreen. Structurally, the top and bottom strips are split into two sections, each with a 90-degree bend that corresponds to the four corners of the touchscreen. They are connected by pins. During installation, the strip is first installed on one corner of the touchscreen, and then the other section is swung towards the higher side of the touchscreen to form a fully enclosed structure. With the use of brackets of different lengths, it can ensure the fully enclosed and centered installation of touchscreens of different sizes.

[0010] Furthermore, a buckle is installed on the top strip near the top surface of the bottom strip, and a locking rod is installed on the bottom strip near the bottom surface of the top strip. The buckle and locking rod are installed on the side away from the mounting groove, and the buckle and locking rod engage accordingly.

[0011] With the above technical solution, in order to ensure the integrity of the limiting frame, the buckles and levers are arranged one above the other at the bottom of the top strip and the other at the top of the bottom strip. After the touch screen is installed, the buckles and levers can be engaged to clamp the touch screen in the limiting frame. The engaging installation method allows for quick disassembly and does not increase preparation time.

[0012] Furthermore, the top and bottom strips are fitted with support rods at the grooves, an outer frame is fixedly installed at the edge of the stepped density grid, the edge of the liner is fixedly connected to the outer frame, and the outer frame has a locking hole facing the support rod.

[0013] With the above technical solution, in order to detachably install the indicator plate, a support rod perpendicular to the touch screen is installed in the groove position of the limiting frame. The outer frame can attach the stepped density grid and the stepped density test target to the screen part of the touch screen from front to back, making the operation quick.

[0014] Furthermore, the thickness of the stepped density grid is less than the depth of the receiving groove, the opening of the receiving groove is perpendicular to the touch screen, there is a frame space gap between the stepped density grid and the touch screen, and an elastic column is installed on the side wall of the receiving groove located at the frame space gap.

[0015] Through the above technical solution, the stepped density grid adopts a conductive structure and is installed in a deep receiving groove. Before being pressed, the stepped density grid is suspended in front of the touch screen. When the triggered component presses from front to back, the stepped density grid contacts the screen part of the touch screen. At the same time, the touch test will not be affected by setting up a stepped density test target for brightness testing.

[0016] Furthermore, a partition is provided between the stepped density test targets, the partition being positioned at the same height as the stepped density grid and facing each other, and a protective film is installed on the side of the stepped density test target away from the liner.

[0017] Through the above technical solutions, the partition can be left empty, allowing the protective film to deform more easily, thereby ensuring that the stepped density grid can more sensitively receive the pressure of the trigger component. Alternatively, it can be filled with flexible colloid to ensure that the multiple split structures of the stepped density test target form a stable whole. The colloid can be made into a semi-transparent state with the same gray level as the surrounding stepped density test targets, reducing the detection error caused by light scattering between stepped density test targets.

[0018] Furthermore, a slider is installed on the side of the contact away from the touch screen, and a horizontally arranged guide sleeve is fitted on the outside of the slider. A limiting component that cooperates with the slider is installed on the inner wall of the guide sleeve. A screw motor is installed on one end of the guide sleeve directly opposite the slider. The photosensitive module is located above the guide sleeve. The photosensitive module is connected to a conversion module through a wire. A housing is fitted on the outside of the photosensitive module and the guide sleeve.

[0019] Through the above technical solution, a horizontal movement drive structure for the contact is designed. The slide bar can slide horizontally along the limiting member when the screw motor rotates. By rotating the screw motor in both directions, the contact can move closer to and away from the touch screen. Furthermore, the photosensitive module is arranged close to the contact and performs synchronous brightness detection with the touch detection, and will not be blocked by the contact and its drive structure.

[0020] Furthermore, the power arm includes a first vertical shaft fixedly connected to the frame, a first horizontal shaft rotatably mounted on the top of the first vertical shaft, a second vertical shaft rotatably mounted on the end of the first horizontal shaft away from the first vertical shaft, a second horizontal shaft rotatably mounted on the top of the second vertical shaft, a third vertical shaft rotatably mounted on the end of the second horizontal shaft away from the second vertical shaft, a third horizontal shaft rotatably mounted on the top of the third vertical shaft, a fourth vertical shaft rotatably mounted on the end of the third horizontal shaft away from the third vertical shaft, a fourth horizontal shaft rotatably mounted on the top of the fourth vertical shaft, and a trigger assembly fixedly mounted on the rotating end of the fourth horizontal shaft.

[0021] Through the above technical solution, the power arm is an eight-degree-of-freedom robotic arm, and each joint position can rotate 360 ​​degrees, so that the contact can completely cover the entire touch screen area, and perform touch and brightness tests of the touch screen without blind spots. In addition, the position of the power arm can be recorded by digital signals as comparative data of touch screen accuracy, so as to achieve high-precision touch accuracy testing.

[0022] A method for detecting gradient density grids on a touchscreen includes the following steps: The frame is arranged on a horizontal plane. The lower edge of the substrate of the touch screen to be tested is vertically installed in the mounting groove in the middle of the bottom strip. The top strip is installed from top to bottom on the upper edge of the substrate. The top strip and the bottom strip are inserted into the insertion frame from top to bottom, and the touch screen is vertically fixed on the frame. The indicator panel's backing film is installed in the slot facing the screen, forming a stepped density grid parallel to the screen surface. The stepped density grid gradually narrows in width from the center of the screen to the surrounding area. The stepped density test target is set facing the hollow part of the stepped density grid, and the gray level of the stepped density grid gradually increases from the center of the screen to the surrounding area. The power arm drives the trigger component to move up and down and left and right while keeping the distance from the screen unchanged. The contact moves to the position of the stepped density grid and extends towards the screen. The stepped density grid is squeezed and deformed to contact the screen. The touch position data sensed by the touch screen is collected and compared with the actual position data of the power arm to determine the touch accuracy of the touch screen. The photosensitive module collects the brightness data of the screen at different density levels of the stepped density test target and records the light transmittance of the touch screen at each density level.

[0023] The beneficial effects of this invention are as follows: (1) By setting up a frame, a limiting frame, a trigger component and an indicator plate, the present invention arranges the touch screen in the center at the position directly opposite the trigger component. The moving trigger component touches the indicator plate to generate a test touch point on the touch screen. The position coordinates of the touch point provided by the touch screen are compared with the actual position coordinates of the trigger component to achieve accurate touch testing. At the same time, the trigger component and the indicator plate are used to test the brightness of different positions of the touch screen, shortening the testing process and improving testing efficiency. (2) By optimizing the indicator plate, the present invention arranges the stepped density grid and the stepped density test target facing each other, and places the stepped density test target in the hollow part of the stepped density grid, making full use of the area of ​​the touch screen and avoiding mutual occlusion between the stepped density grid and the stepped density test target. This ensures that the accuracy will not be reduced due to interference between the stepped density grid and the stepped density test target when performing brightness test and touch test at the same time. Attached Figure Description

[0024] Figure 1 This is a first-view structural diagram of the present invention; Figure 2 This is a second-view structural diagram of the present invention; Figure 3 This is a schematic diagram showing the position between the triggering component and the power arm of the present invention; Figure 4 This is a cross-sectional schematic diagram of the triggering component of the present invention; Figure 5 This is a schematic diagram showing the disassembly of the insert frame, touch screen, limiting frame and indicator plate of the present invention; Figure 6 This is a schematic diagram showing the separation between the limiting frame and the indicator plate of the present invention; Figure 7 This is a schematic diagram of the structure of the limiting frame of the present invention; Figure 8 This is a cross-sectional schematic diagram of the indicator plate of the present invention.

[0025] Reference numerals: 1. Frame; 11. Insert frame; 12. Bearing seat; 2. Limiting frame; 21. Top strip; 22. Bottom strip; 23. Support lug; 24. Mounting slot; 25. Support rod; 26. Insert groove; 27. Pin; 28. Buckle; 29. ​​Locking rod; 3. Indicator plate; 31. Stepped density grid; 32. Outer frame; 33. Liner; 34. Stepped density test target; 35. Partition; 36. Protective film; 37. Receiving groove; 38. Elastic column; 39. 4. Card hole; 4. Trigger assembly; 41. Housing; 42. Contact; 43. Photosensitive module; 44. Slide rod; 45. Guide sleeve; 46. Screw motor; 47. Conversion module; 48. Limiting component; 5. Power arm; 51. First vertical axis; 52. First horizontal axis; 53. Second vertical axis; 54. Second horizontal axis; 55. Third vertical axis; 56. Third horizontal axis; 57. Fourth vertical axis; 58. Fourth horizontal axis; 6. Touch screen; 61. Substrate part; 62. Screen part. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0027] like Figure 1 - Figure 8 As shown, this embodiment provides a device for detecting the gradient density grid of a touch screen, including: The frame 1 has an upward-opening insert frame 11 formed on its top; The limiting frame 2 is detachably installed at the insertion frame 11. The limiting frame 2 includes a top strip 21 and a bottom strip 22. The top strip 21 is a downward-opening "U"-shaped structure, and the bottom strip 22 is an upward-opening "U"-shaped structure. The ends of the top strip 21 and the bottom strip 22 can be connected to each other to form a closed square frame. The top strip 21 and the bottom strip 22 have a mounting groove 24 on opposite sides. The mounting groove 24 is used to mount the base plate part 61 of the touch screen 6. The base plate part 61 belongs to the circuit board and its protective shell of the touch screen 6. It is located on the rear side of the screen part 62 and provides installation space and power supply control for the screen part 62. The screen part 62 is used to display images and collect touch points for human-computer interaction. The inner edge of the side wall on the same side of the top strip 21 and the bottom strip 22 is provided with a recess 26. The front end of the recess 26 is open to install the indicator plate 3. Indicator plate 3 is detachably installed in slot 26. Indicator plate 3 includes a backing film 33. A receiving slot 37 is opened on the side of the backing film 33 facing the touch screen 6. A conductive stepped density grid 31 is installed on the bottom surface of the receiving slot 37. The density of the stepped density grid (31) gradually increases from the center to the periphery. At the same time, a stepped density test target 34 is installed on the side of the backing film 33 facing away from the touch screen 6. The stepped density test target 34 is filled with different gray levels in each grid of the stepped density grid 31. The gray level gradually increases from the center of the screen part 62 to the periphery. Trigger component 4 is mounted on the side of indicator plate 3 facing away from touch screen 6 via power arm 5. Trigger component 4 includes contact 42, which moves vertically towards and away from touch screen 6 under the drive of power arm 5. Trigger component 4 also includes photosensitive module 43 facing touch screen 6. Photosensitive module 43 is connected to conversion module 47 via wire. Photosensitive module 43 is arranged close to contact 42. Photosensitive module 43 is an existing photosensitive sensor, which is electrically connected to conversion module 47 with wire. Conversion module 47 is then connected to an external processing module. Conversion module 47 converts the detected light signal into an electrical signal to detect the brightness uniformity of different positions on touch screen 6.

[0028] In a further embodiment, the specific detachable mounting structure between the limiting frame 2 and the frame 1 is disclosed, referring to... Figure 2 and Figure 5 A support seat 12 is fixedly installed on the vertical side wall of the insertion frame 11. An installation gap is left between the vertical side wall of the support seat 12 and the vertical side wall of the insertion frame 11. The upper part of the installation gap and the side near the limit frame 2 are open. The top strip 21 and the bottom strip 22 are equipped with ears 23 at the corresponding positions of the support seat 12. The ears 23 extend horizontally away from the touch screen 6 and are snapped into the installation gap left between the vertical side wall of the support seat 12 and the vertical side wall of the insertion frame 11 from top to bottom. After installation, the front and back directions of the touch screen 6 are not blocked by fixing, and the movement of the trigger component 4 will not be hindered. When disassembling, the limit frame 2 can be lifted to separate it from the frame 1, making the operation of replacing the touch screen 6 faster.

[0029] In a further embodiment, to ensure the accuracy of the test, the touchscreen 6 needs to be installed in the center. Specifically, refer to... Figure 7Both the top strip 21 and the bottom strip 22 adopt a segmented structure in the middle. The top strip 21 and the bottom strip 22 are provided with pins 27 at the segmentation points. The ends of the top strip 21 and the bottom strip 22 away from the pins 27 are bent vertically towards each other. In order to achieve faster centering installation of the touch screen 6, a special tooling is designed for the size of the touch screen 6. Structurally, the top strip 21 and the bottom strip 22 are split into two segments in the middle. Each segment has a 90-degree bend, which corresponds to the four corners of the touch screen 6 respectively, and is connected by pins 27. The mounting groove 24 completely covers the entire top strip 21 and the bottom strip 22. During installation, it is first installed on one corner of the touch screen 6, and then the other segment is swung towards the touch screen 6 to form a fully enclosed structure. With the support ears 23 of different lengths, it can ensure the fully enclosed centering installation of touch screens 6 of different sizes. To ensure the integrity of the limit frame 2, refer to Figure 7 A buckle 28 is installed on the top surface of the top strip 21 near the top surface of the bottom strip 22, and a locking rod 29 is installed on the bottom surface of the bottom strip 22 near the bottom surface of the top strip 21. The buckle 28 and the locking rod 29 are arranged one above the other at the bottom of the top strip 21 and the top of the bottom strip 22, respectively. The buckle 28 and the locking rod 29 are installed on the side away from the mounting groove 24. The front and rear extension of the locking rod 29 is greater than the thickness of the bottom strip 22. There is an arc-shaped groove at the lower part of the buckle 28, which is directly opposite the flat rod of the locking rod 29. Pressing down the buckle 28 can make the buckle 28 and the locking rod 29 engage. After the touch screen 6 is installed, the buckle 28 and the locking rod 29 can be engaged to clamp the touch screen 6 in the limiting frame 2. The engaging installation method is quick to install and remove without increasing preparation time.

[0030] In a further embodiment, a specific configuration is disclosed for the detachable installation of the indicator plate 3, referring to... Figure 5 and Figure 7 The top strip 21 and bottom strip 22 are equipped with support rods 25 at the groove 26. Multiple support rods 25 are provided perpendicular to the touch screen 6. An outer frame 32 is fixedly installed at the edge of the stepped density grid 31. The outer frame 32 has a locking hole 39 opposite to the support rod 25. The support rod 25 can be inserted vertically into the locking hole 39. The indicator plate 3 can be quickly installed by using the friction of the contact surface. When disassembling, the indicator plate 3 can be separated by pulling it forward. The edge of the backing film 33 is fixedly connected to the outer frame 32. The outer frame 32 can attach the stepped density grid 31 and the stepped density test target 34 from front to back to the screen part 62 of the touch screen 6, which is quick and easy to operate.

[0031] In a further embodiment, to avoid accidental touches affecting the accuracy of touch testing, refer to Figure 8The thickness of the stepped density grid 31 is less than the depth of the receiving groove 37. The opening of the receiving groove 37 is perpendicular to the touch screen 6. There is a support space gap between the stepped density grid 31 and the touch screen 6. The stepped density grid 31 adopts a conductive structure and is installed in the deeper receiving groove 37. Before being pressed, the stepped density grid 31 is suspended in front of the touch screen 6. When the trigger component 4 presses from front to back, the stepped density grid 31 contacts the screen portion 62 of the touch screen 6. At the same time, the side wall of the receiving groove 37 located at the support space gap is equipped with an elastic material. The elastic column 38, such as a cylinder made of elastic rubber, is compressed when pressed. After the trigger component 4 is disengaged and the pressing pressure is lost, the elastic column 38 will rebound, allowing the stepped density grid 31 to return to its original position. This prevents accidental touches caused by the stepped density grid 31 detaching from the bottom surface of the receiving groove 37. At the same time, using the stepped density grid 31 as a touch medium allows the contact 42 to generate an electric shock on the touch screen 6 through the stepped density test target 34, without affecting the touch test due to the brightness test performed by setting the stepped density test target 34.

[0032] In a further embodiment, a specific installation method for a stepped density test target 34 is disclosed, referring to... Figure 6 and Figure 8 A partition 35 is provided between the stepped density test targets 34. The partition 35 is set at the same height as the stepped density grid 31 and is directly opposite to it. The partition 35 can be left empty, so that the protective film 36 can deform more easily, thereby ensuring that the stepped density grid 31 can receive the pressure of the trigger component 4 more sensitively. Alternatively, it can be filled with a flexible colloid to ensure that the multiple split structures of the stepped density test target 34 form a stable whole. The colloid can be made into a semi-transparent state with the same gray level as the surrounding stepped density test targets 34 to reduce the detection error caused by light scattering between the stepped density test targets 34. The protective film 36 is installed on the side of the stepped density test target 34 away from the liner 33 to prevent the contact 42 or other objects that directly contact the stepped density test target 34 from wearing down the stepped density test target 34, thereby ensuring the accuracy of brightness measurement. Therefore, the protective film 36 can be designed as a detachable single film with electrostatic adsorption, which is more convenient for later maintenance.

[0033] In a further embodiment, refer to Figure 4A horizontal movement drive structure for a contact 42 is designed. A slide rod 44 is mounted on the side of the contact 42 away from the touchscreen 6, and the slide rod 44 is perpendicular to the touchscreen 6. A horizontally arranged guide sleeve 45 is fitted around the outside of the slide rod 44. A screw motor 46 is mounted on the end of the guide sleeve 45 away from the contact 42. A limiting member 48 that cooperates with the slide rod 44 is installed on the inner wall of the guide sleeve 45. The slide rod 44 can slide horizontally along the limiting member 48 when the screw motor 46 rotates. By rotating the screw motor 46 in both directions, the contact 42 can move closer to or away from the touchscreen 6. Specifically, the limiting member 48 can be a rectangular strip parallel to the axis of the guide sleeve 45 and located on the inner wall of the guide sleeve 45. The slide rod 44 is positioned corresponding to the rectangular strip. The notch allows for horizontal sliding limit. The photosensitive module 43 is located above the guide sleeve 45. The photosensitive module 43 is connected to the conversion module 47 via wires. The photosensitive module 43 is arranged close to the contact 42. The photosensitive module 43 is an existing photosensitive sensor, which is electrically connected to the conversion module 47 via wires. The conversion module 47 is then connected to an external processing module. The conversion module 47 converts the detected light signal into an electrical signal, making it easier to perform subsequent processing. The brightness is detected synchronously with the touch detection and will not be blocked by the contact 42 and its driving structure. The photosensitive module 43 and the guide sleeve 45 are fitted with a housing 41 to fix their positions and ensure positional stability during long-term use.

[0034] In a further embodiment, a specific power arm 5 is disclosed, referring to... Figure 3 The power arm 5 includes a first vertical shaft 51 fixedly connected to the frame 1. A first horizontal shaft 52 is rotatably mounted on the top of the first vertical shaft 51. A second vertical shaft 53 is rotatably mounted on the end of the first horizontal shaft 52 away from the first vertical shaft 51. A second horizontal shaft 54 ​​is rotatably mounted on the top of the second vertical shaft 53. A third vertical shaft 55 is rotatably mounted on the end of the second horizontal shaft 54 ​​away from the second vertical shaft 53. A third horizontal shaft 56 is rotatably mounted on the top of the third vertical shaft 55. A fourth vertical shaft 57 is rotatably mounted on the end of the third horizontal shaft 56 away from the third vertical shaft 55. A horizontally positioned fourth axis 58 is rotatably mounted at the top of the vertical axis 57. The trigger component 4 is fixedly mounted on the rotating end of the fourth axis 58. Each horizontal and vertical axis has a joint motor. The power arm 5 is an eight-degree-of-freedom robotic arm, and each joint position can rotate 360 ​​degrees, so that the contact 42 can completely cover the entire area of ​​the touch screen 6, allowing for touch and brightness testing of the touch screen 6 without blind spots. Furthermore, the position of the power arm 5 can be recorded by digital signals as comparative data for the touch accuracy of the touch screen 6, achieving high-precision touch accuracy testing.

[0035] A method for detecting gradient density grids on a touchscreen includes the following steps: The frame 1 is arranged on a horizontal plane. The lower edge of the substrate 61 of the touch screen 6 to be tested is vertically installed in the mounting groove 24 in the middle of the bottom strip 22. The top strip 21 is installed from top to bottom along the upper edge of the substrate 61. Specifically, both the top strip 21 and the bottom strip 22 are segmented designs. The two segments of the top strip 21 and the bottom strip 22 are rotatably connected by a pin 27. The top strip 21 and the bottom strip 22 are engaged by corresponding clips 28 and clips 29, thus fully enclosing and installing the touch screen 6. The top strip 21 and bottom strip 22 are inserted into the insert frame 11 from top to bottom. The support ears 23 are arranged on the left and right sides of the touch screen 6 and can be inserted into the carrier 12 from top to bottom. To accommodate touch screens 6 of different sizes, the limiting frame 2 of different sizes can be designed. For smaller touch screens 6 and limiting frames 2, the support ears 23 can be lengthened to accommodate the spacing of the carrier 12 that cannot be reduced, so that the touch screen 6 can be fixed vertically and centrally on the frame 1. The backing film 33 of the indicator plate 3 is installed in the groove 26 facing the screen part 62. The backing film 33 adopts a fully transparent structure and will not affect the brightness detection. A stepped density grid 31 parallel to the surface of the screen part 62 is formed on the surface of the screen part 62. The stepped density grid 31 gradually narrows in width from the center of the screen part 62 to the surrounding area. The stepped density grid 31 is sparse in the middle and dense at the edges, and is densest at the corners. It can detect the touch accuracy at the edges of the screen, especially the dead corners. Because different sizes of touch screens 6 are cut from a whole screen during manufacturing, poor touch accuracy is prone to occur at the corners due to mechanical stress. Therefore, targeted and concentrated testing is required. The power arm 5 drives the trigger component 4. While maintaining a constant distance from the screen 62, the contact 42 moves vertically and horizontally, extending towards the screen 62 at the position of the stepped density grid 31. The stepped density grid 31 is compressed and deformed to contact the screen 62. The conductive stepped density grid 31 will cause a touch point to appear at the corresponding position on the screen 62. The touch position data sensed by the touch screen 6 is collected using a data cable via an external terminal, and the polar coordinate data of the height and horizontal position of the touch point is obtained through signal conversion. At this time, the actual position data of the power arm 5 is collected as comparison data. This comparison data is the actual height and horizontal position polar coordinate data of the contact 42. By comparing the two data, the touch accuracy of the touch screen 6 is determined. The stepped density test target 34 is positioned directly opposite the hollow part of the stepped density grid 31, utilizing the unused space of the stepped density grid 31. Furthermore, the stepped density grid 31 is designed as a thin metal wire, so that the brightness test error of the stepped density test target 34 will not be caused by the step density grid 31 blocking the light. It can simultaneously test touch accuracy and screen brightness. The gray level of the stepped density grid 31 gradually increases from the center of the screen part 62 to the periphery. The change in density level can help detect the transparency and uniformity of the touch screen 6 under different lighting conditions. The photosensitive module 43 collects the brightness data of the screen part 62 at different density levels of the stepped density test target 34 and records the light transmittance of the touch screen 6 at each density level. That is, it checks whether the light transmittance or reflectance of the touch screen 6 is within the predetermined specification range and evaluates the optical uniformity of the entire screen.

[0036] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention.

Claims

1. A device for detecting gradient density grids in a touchscreen, characterized in that, include: The limiting frame (2) includes a top strip (21) and a bottom strip (22) that are detachably connected. The inner sidewalls of the top strip (21) and the bottom strip (22) are respectively provided with mounting grooves (24). The mounting grooves (24) are used to mount the touch screen (6), so that the top strip (21) and the bottom strip (22) surround and fix the touch screen (6) from opposite sides. The inner sidewalls of the top strip (21) and the bottom strip (22) on the same side are respectively provided with recessed grooves (26). The indicator plate (3) is detachably embedded in the space enclosed by the groove (26) of the top strip (21) and the bottom strip (22) and is stacked with the touch screen (6). The indicator plate (3) includes a backing film (33). The backing film (33) has multiple crisscrossing receiving grooves (37) on the side facing the touch screen (6). A conductive wire is installed on the bottom surface of each receiving groove (37). All the conductive wires are crisscrossed to form a stepped density grid (31). The density of the stepped density grid (31) gradually increases from the center to the periphery. A stepped density test target (34) is installed on the side of the backing film (33) facing away from the touch screen (6). The trigger component (4) is mounted on the side of the indicator plate (3) facing away from the touch screen (6) via a power arm (5). The trigger component (4) includes a contact (42) and a photosensitive module (43) arranged side by side. The contact (42) presses the indicator plate (3) vertically or moves away from the indicator plate (3) under the drive of the power arm.

2. The apparatus of claim 1, wherein, The stepped density test target (34) consists of multiple test targets spaced apart. A partition (35) is provided between each pair of adjacent test targets. The partition (35) is an empty slot or a flexible colloid filled with it. The partition (35) is set at the same height as the receiving slot (37) and faces each other.

3. The apparatus of claim 1, wherein, The thickness of the conductive wire in the receiving groove (37) is less than the depth of the receiving groove (37), and the receiving groove (37) has a plurality of spaced elastic columns (38) attached to its inner sidewall.

4. The apparatus of claim 1, wherein, The top strip (21) and bottom strip (22) are both formed by two L-shaped fixing brackets rotatably connected by a pin shaft. The top strip (21) and bottom strip (22) are joined together to form a rectangle that can surround the touch screen.

5. The apparatus of claim 4, wherein, Both ends of the top strip (21) are equipped with buckles (28), and both ends of the bottom strip (22) are equipped with levers (29). The buckles (28) and levers (29) engage with each other so that the top strip (21) and the bottom strip (22) are joined together to form a rectangle.

6. The apparatus of claim 1, wherein, The top strip (21) and bottom strip (22) each have multiple support rods (25) installed at intervals and vertically on the bottom wall of their respective grooves (26). An outer frame (32) is fixedly installed at the edge of the whole formed by the liner (33) and the stepped density test target (34). The outer frame (32) has a locking hole (39) facing each support rod (25), and the support rods (25) are inserted into the locking holes (39) one by one.

7. The apparatus of claim 1, wherein, The stepped density test target (34) has a protective film (36) attached to the side away from the liner (33).

8. The device for detecting the gradient density grid of a touch screen according to claim 1, characterized in that, A slide rod (44) is installed on the side of the contact (42) away from the indicator plate (3). A guide sleeve (45) is sleeved on the outside of the slide rod (44). A limiting member (48) that cooperates with the slide rod (44) is installed on the inner wall of the guide sleeve (45). A screw motor (46) is installed on the end of the guide sleeve (45) away from the contact (42). The photosensitive module (43) is located next to the guide sleeve (45). The photosensitive module (43) is connected to the conversion module (47) through a wire. A housing (41) is installed on the outer side of the photosensitive module (43) and the guide sleeve (45).

9. The device for detecting the gradient density grid of a touch screen according to claim 1, characterized in that, The power arm (5) includes a first vertical shaft (51) fixedly connected to the frame (1), a first horizontal shaft (52) rotatably mounted on the top of the first vertical shaft (51), a second vertical shaft (53) rotatably mounted on the end of the first horizontal shaft (52) away from the first vertical shaft (51), a second horizontal shaft (54) rotatably mounted on the top of the second vertical shaft (53), a third vertical shaft (55) rotatably mounted on the end of the second horizontal shaft (54) away from the second vertical shaft (53), a third horizontal shaft (56) rotatably mounted on the top of the third vertical shaft (55), a fourth vertical shaft (57) rotatably mounted on the end of the third horizontal shaft (56) away from the third vertical shaft (55), a fourth horizontal shaft (58) rotatably mounted on the top of the fourth vertical shaft (57), and a trigger assembly (4) fixedly mounted on the rotating end of the fourth horizontal shaft (58).

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