Alarm detection device for preventing more pins and less pins in LCD (Liquid Crystal Display) upper pin test

Abstract

The utility model discloses an alarm detection device for preventing more pins and less pins in an LCD upper pin test. The alarm detection device comprises a test fixing plate and a test fixture. The test fixture is arranged on the test fixing plate and comprises a test main body, a connection PIN group, two groups of less-pin detection PINs, two groups of multi-pin detection PINs, two power supplies, a first alarm and a second alarm. The connecting PIN group is horizontally arranged, the two groups of less-pin detection PINs are located at two sides of the edge of the connecting PIN group, and the two groups of multi-pin detection PINs are located at one side, far away from the connecting PIN group, of the less-pin detection PINs; and the few-pin detection PIN and the multi-pin detection PIN are electrically connected with the corresponding power supply and the alarm respectively. According to the device, the problems of more pins and less pins on the LCD are automatically detected and an alarm is triggered through on-off of a circuit formed by contacting the pins with the PINs, the abnormal number of the pins can be efficiently and accurately identified, the product quality and the production efficiency are improved, and the labor cost is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of LCD production, and in particular to an alarm detection device for preventing excess or missing pins in LCD pin testing. Background Technology

[0002] In the LCD manufacturing industry, the mounting process is a crucial step. With the widespread application of LCD products, the quality requirements for them are becoming increasingly stringent.

[0003] Currently, issues such as missing or extra pins frequently occur during LCD pin assembly. The industry currently relies primarily on manual visual inspection and simple electrical tests for LCD pin inspection. Manual visual inspection is inefficient and prone to missed or false positives due to human error; while simple electrical tests can detect some electrical performance problems, they struggle to accurately identify pin count anomalies such as missing or extra pins. For example, some existing testing equipment can determine the presence of open circuits by detecting the connectivity between pins and the circuit board to form a display image, but it cannot identify extra pins or determine whether the problem is due to missing pins or an open circuit in the internal ITO circuit of the LCD. Therefore, existing technologies suffer from the problems of low efficiency and error-proneness of manual visual inspection, and the inability of simple electrical tests to accurately identify missing or extra pins. Utility Model Content

[0004] This utility model aims to at least partially solve one of the problems in related technologies. Therefore, one of the objectives of this utility model is to provide an alarm detection device for preventing excess or missing pins in LCD pin testing. This device enables efficient, practical, and low-cost detection, quickly and accurately detecting excess or missing pins on LCD pins, effectively improving product quality, reducing defect rates, lowering production costs, and increasing production efficiency.

[0005] An alarm detection device for preventing excess or missing pins during LCD pin testing, the device comprising:

[0006] Test mounting plate;

[0007] A test fixture is mounted on the test fixing plate. The test fixture includes a test body, a connecting pin group, two sets of missing pin detection pins, two sets of multi-pin detection pins, two power supplies, a first alarm, and a second alarm. The connecting pin group, the two sets of multi-pin detection pins, and the two sets of missing pin detection pins are all connected to the test body. The connecting pin group is horizontally arranged. The two sets of missing pin detection pins are located on opposite sides of the edge of the connecting pin group. The two sets of multi-pin detection pins are located on the side of the two sets of missing pin detection pins away from the connecting pin group. The two sets of missing pin detection pins are electrically connected to one of the power supplies and the first alarm, and the two sets of multi-pin detection pins are electrically connected to the other power supply and the second alarm.

[0008] Furthermore, both the few-pin detection PIN and the multi-pin detection PIN have a double-layer structure.

[0009] Furthermore, each set of missing pin detection pins includes two missing pin detection pins, which are connected in parallel and electrically connected to a power supply and the first alarm.

[0010] Furthermore, there are multiple missing pin detection pins, which are arranged in parallel with the connecting pin group and electrically connected to the power supply and the first alarm.

[0011] Furthermore, the test fixture also includes a micro switch, which is connected to the test body and located below the connecting PIN pin group. The micro switch is connected in series with the power supply and the first alarm.

[0012] Furthermore, the test fixing plate is provided with a mounting base, which is located on one side of the test body and the connecting PIN pin group. The mounting base is recessed with a mounting groove for installing the inspection product.

[0013] Furthermore, the test fixing plate has a positioning port located on one side of the mounting base, and the positioning port is used to check the positioning of the product.

[0014] Furthermore, the number of positioning ports is multiple, and the multiple positioning ports are arranged at intervals.

[0015] Furthermore, the material of the test subject is bakelite.

[0016] Furthermore, the test fixing plate is made of transparent plastic.

[0017] Compared with the prior art, the technical solution provided in this application has the following advantages: The pin fixing part of this application adopts a unique dual-PIN design on both sides. Two sets of missing pin detection PINs are located on both sides of the edge of the connecting PIN group. Both sets of missing pin detection PINs are electrically connected to a power supply and the first alarm to detect missing pins. When any corner of the LCD terminal is missing a pin, the metal pin cannot contact the missing pin detection PIN of the test pin fixing part, and a closed loop cannot be formed. At this time, the control module will recognize the state and trigger the alarm mechanism. The first alarm will issue a prompt to remind the operator that there is a missing pin problem on the current LCD. The two sets of multi-pin detection PINs are located on the side of the two sets of missing pin detection PINs away from the connecting PIN group. Both sets of multi-pin detection PINs are electrically connected to a power supply and the second alarm to detect multi-pins. When any corner of the LCD terminal is multi-pin, the extra metal pin contacts the multi-pin detection PIN, forming a closed loop and triggering the alarm mechanism. The second alarm will issue a prompt to remind the operator that there is a multi-pin problem on the current LCD.

[0018] This application presents an alarm detection device for preventing missing or extra pins on LCD leads. The entire detection system is ingeniously designed, requiring no complex operating procedures. The detection function can be simultaneously implemented within the existing lead testing process, eliminating the need for dedicated personnel to inspect for such defects. When missing or extra pins are detected, the alarm is automatically triggered, effectively preventing defective products from leaving the factory and significantly improving product quality and production efficiency. It accurately identifies missing or extra pin issues, greatly reducing false positives and false negatives, thus ensuring product quality. Compared to manual visual inspection, no additional manual intervention is required, allowing for rapid detection of LCD leads and significantly improving production efficiency. The automatic detection and alarm system reduces manual intervention, lowering labor costs and improving the consistency and stability of the detection process. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] In the attached image:

[0022] Figure 1This is a schematic diagram of an embodiment of the alarm detection device for preventing multiple or missing pins in LCD pin testing according to this application;

[0023] Figure 2 This is a schematic diagram of another perspective of an embodiment of the alarm detection device for preventing missing or excessive pins in LCD pin testing according to this application.

[0024] Figure 3 This is a front view of an embodiment of the alarm detection device for preventing missing or excessive pins in LCD pin testing according to this application;

[0025] Figure 4 This is a front view of another embodiment of the alarm detection device for preventing missing or excessive pins in LCD pin testing according to this application;

[0026] Figure 5 The circuit diagram of the LCD pin detection device for preventing missing or excessive pins in this application is for detecting and alarming missing pins.

[0027] Figure 6 The circuit diagram for the LCD pin detection and alarm device for preventing missing or extra pins in this application is a circuit diagram for pin detection and alarm.

[0028] Figure label:

[0029] 1. An alarm detection device for preventing missing or extra pins during LCD pin testing; 10. Test fixing plate; 11. Mounting base; 111. Mounting slot; 13. Positioning port; 20. Test fixture; 21. Test body; 22. Connecting PIN pin group; 23. Missing pin detection PIN pin; 24. Extra pin detection PIN pin; 25. Power supply; 26. First alarm; 27. Second alarm; 28. Micro switch. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0031] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] like Figures 1 to 6 As shown, the present application provides an alarm detection device 1 for preventing excess or missing pins in LCD pin testing, comprising:

[0033] Test fixing plate 10;

[0034] Test fixture 20 is mounted on test fixing plate 10. Test fixture 20 includes test body 21, connecting pin group 22, two sets of missing pin detection pins 23, two sets of multi-pin detection pins 24, two power supplies 25, first alarm 26 and second alarm 27. Connecting pin group 22, two sets of multi-pin detection pins 24 and two sets of missing pin detection pins 23 are all connected to test body 21. Connecting pin group 22 is horizontally arranged. The two sets of missing pin detection pins 23 are located on both sides of the edge of connecting pin group 22. The two sets of multi-pin detection pins 24 are located on the side of the two sets of missing pin detection pins 23 away from connecting pin group 22. The two sets of missing pin detection pins 23 are electrically connected to one power supply 25 and the first alarm 26. The two sets of multi-pin detection pins 24 are electrically connected to the other power supply 25 and the second alarm 27.

[0035] The test fixture 10 serves as the basic support structure for the entire testing device, used to mount the test jig 20 and other accessories. It provides a reference plane for product positioning and installation, ensuring the positional accuracy of the LCD product during testing.

[0036] The test fixture 20 integrates core testing components, and through the physical contact and circuit switching between the PIN pin group and the LCD pins, it realizes automatic detection and alarm for problems such as too many pins or too few pins.

[0037] The test body 21 serves as a mounting carrier for components such as the PIN pin group, power supply 25, and alarm, providing structural support.

[0038] The connecting pin group 22 contacts the normal pins on the LCD to form a basic electrical connection, serving as the reference pin group for detection. The connecting pin group 22 is horizontally positioned and is usually arranged parallel to the LCD pin array to ensure one-to-one contact. As a reference position for detecting fewer and more pins, fewer-pin detection pins 23 and more-pin detection pins 24 are respectively arranged on both sides of its edge.

[0039] Two sets of missing pin detection pins 23 are used to detect whether there is a missing pin problem on the LCD. They are located on both sides of the edge of the connecting pin group 22 (such as the four corners of the upper left, upper right, lower left, and lower right), or arranged side by side with the connecting pin group 22 (covering the middle pin). Each set of missing pin detection pins 23 is electrically connected to a power supply 25 and a first alarm 26 (such as a buzzer or LED indicator). When a missing pin detection pin 23 is not in contact with a pin (open circuit), the circuit is broken, triggering the first alarm 26.

[0040] Two sets of multi-pin detection pins 24 are used to detect whether there are extra pins (excess pins) on the LCD. They are located on the side of the two sets of few-pin detection pins 23 away from the connecting pin group 22, that is, outside the normal pin range. Each set of multi-pin detection pins 24 is electrically connected to a power supply 25 and a second alarm 27 (such as a buzzer or LED indicator). When the multi-pin detection pin 24 contacts the extra pin (conducts), the circuit closes, triggering the second alarm 27.

[0041] Two power supplies 25 provide power to the missing pin and extra pin detection circuits, driving the alarm to operate. The missing pin detection and extra pin detection circuits are connected to power supplies 25 independently to ensure that the two detection paths do not interfere with each other.

[0042] The first alarm 26 and the second alarm 27 are used to indicate missing and extra pin abnormalities, respectively. A buzzer (auditory warning) or an LED indicator (visual warning), or a combination of both, can be used to achieve dual warning. The two alarm systems are separate to avoid confusion between missing and extra pin issues, ensuring operators can quickly identify the type of abnormality.

[0043] like Figure 5 As shown, when the fixture is clamped, the micro switch 28 is in the conducting state due to the position change. When testing is performed, in a normal product without missing pins, there are metal pins at positions 2 and 4, so positions 2 and 4 are short-circuited, and the first alarm 26 does not activate; when it is detected that there are no metal pins at positions 2 and 4, positions 2 and 4 are open-circuited, and the first alarm 26 alarms for missing pins.

[0044] like Figure 6 The diagram shown is a schematic of a multi-pin detection alarm. When the fixture is clamped for testing, there are no metal pins at positions 1 and 3 under normal circumstances, so positions 1 and 3 are open circuits and the second alarm 27 does not activate. When metal pins are detected at positions 1 and 3, positions 1 and 3 are connected, and the second alarm 27 triggers a multi-pin alarm.

[0045] By using two sets of independent pins and an alarm system, the detection paths for excess and missing pin issues are separated to avoid confusion. For example, the missing pin detection pin 23 only triggers an alarm when an edge pin is missing, while the excess pin detection pin 24 only conducts when the pin is outside the normal pin range, ensuring accurate identification of both types of anomalies.

[0046] Manual visual inspection is required, but the alarm is automatically triggered by circuit continuity, reducing human error in detecting certain components. As stated in the technical manual, traditional manual visual inspection is inefficient and prone to misjudgment, while this device uses physical contact detection to directly convert pin count abnormalities into electrical signals, improving detection reliability.

[0047] The testing function is integrated into the existing foot testing process, eliminating the need for additional steps and improving efficiency through simultaneous testing.

[0048] Furthermore, both the few-pin detection PIN 23 and the multi-pin detection PIN 24 have a double-layer structure.

[0049] The dual-layer structure allows for contact with pins from different heights or angles, reducing missed detections caused by pin installation deviations (such as tilting or bending). For example, if a single-layer PIN can only detect horizontal contact, the dual-layer structure can cover vertical contact, ensuring that detection is triggered even if the pin is slightly offset.

[0050] The dual-layer design can create redundant detection paths. If one layer of PIN pins fails due to contamination or wear, the other layer can still function normally, improving the durability of the device.

[0051] Furthermore, such as Figures 1 to 3 As shown, each set of missing pin detection pins 23 includes two missing pin detection pins 23, which are connected in parallel and electrically connected to a power supply 25 and a first alarm 26.

[0052] In this embodiment, each set of missing pin detection PIN pins 23 includes two missing pin detection PIN pins 23, and two sets of missing pin detection PIN pins 23 include four missing pin detection PIN pins 23. The four PIN pins correspond to the four corners of the LCD (top left, top right, bottom left, and bottom right). Each corner independently detects missing pin problems, avoiding single-point missed detection at the edge. For example, if only one edge is detected, missing pin problems at the opposite corner may be missed, while the four-corner parallel design ensures that missing pins at any corner will trigger an alarm.

[0053] Parallel circuits do not require complex logic judgments; an alarm is triggered as soon as any part of the circuit is broken, reducing the complexity of the control module and avoiding the problem of overall failure due to a fault in a node of a series circuit.

[0054] Furthermore, such as Figure 4 As shown, there are multiple missing pin detection PINs 23. These multiple missing pin detection PINs 23 are arranged in parallel with the connecting PIN group 22 and are electrically connected to a power supply 25 and a first alarm 26.

[0055] In this embodiment, if the missing pin problem occurs on a middle pin (not at one of the four corners), the aforementioned four-corner detection may fail to identify it. However, this embodiment utilizes multiple pins arranged in parallel to detect the absence of any pin. For example, if a middle pin is missing, its corresponding missing pin detection pin 23 will trigger an alarm due to lack of contact, thus overcoming the limitations of four-corner detection. Different LCD products may have different pin counts and distributions; the parallel design of multiple pins allows for flexible adaptation to various specifications, improving the device's versatility.

[0056] Furthermore, the test fixture 20 also includes a micro switch 28, which is connected to the test body 21 and located below the connecting PIN pin group 22. The micro switch 28 is connected in series with the power supply 25 and the first alarm 26.

[0057] In this embodiment, the micro switch 28 is connected to the first alarm 26. The micro switch 28 is activated only when the PIN pin is clamped (test begins), at which point the missing pin detection circuit starts working, avoiding false alarms when the pin is not clamped. The micro switch 28 achieves "test state locking," enabling detection only when the PIN pin is in normal contact with the pin. For example, if the device is not fully clamped, the micro switch 28 is not activated, and even if the missing pin detection PIN pin 23 is not in contact, no alarm will be triggered, avoiding misjudgments due to improper installation. The micro switch 28 binds the "clamping action" and the "detection action," ensuring that the detection result only reflects the number of pins under normal test conditions.

[0058] Alternatively, the micro switch 28 can be a normally closed type (open when not clamped, and open when clamped) or a normally open type (reverse logic), which can be flexibly selected according to the circuit design.

[0059] Furthermore, the test fixing plate 10 is provided with a mounting base 11, which is located on one side of the test body 21 and the connecting PIN pin group 22. The mounting base 11 is recessed with a mounting groove 111, which is used to install the inspection product.

[0060] In this embodiment, the dimensions of the mounting slot 111 are slightly looser than the glass but with strictly controlled deviations. This design accommodates the product while restricting its lateral movement, ensuring a one-to-one correspondence between pins and PINs. For example, if the product is installed at an angle, the missing pin detection PIN 23 may accidentally touch other pins. The mounting slot 111 avoids this problem through physical limiting. The design of the mounting slot 111 facilitates quick product placement by operators, reduces alignment time, and improves testing efficiency.

[0061] Furthermore, the test fixing plate 10 has a positioning port 13, which is located on one side of the mounting base 11 and is used for product positioning.

[0062] Specifically, the positioning port 13, in conjunction with the mounting slot 111, achieves two-dimensional positioning (e.g., in the X / Y axis direction), ensuring that the product has no offset in both the horizontal and vertical directions, further improving pin alignment accuracy. The mounting slot 111 mainly restricts the planar movement of the product, while the positioning port 13 (e.g., pin hole, slot) can restrict rotational or vertical offset. For example, through the cooperation of the positioning port 13 and the positioning pin, it can be ensured that the pin array of the LCD is completely parallel to the connecting PIN pin group 22, avoiding detection failure due to angular deviation. The positioning port 13 provides a positioning reference for the robotic arm or tooling fixture, facilitating integration into automated production lines.

[0063] Alternatively, the positioning port 13 can be a circular positioning hole with a cylindrical pin to achieve X / Y axis positioning; or it can be a U-shaped groove or dovetail groove with a positioning block to restrict horizontal movement and rotation.

[0064] Furthermore, there are multiple positioning ports 13, which are spaced apart.

[0065] In this embodiment, the spaced positioning ports 13 can form multiple positioning points around the mounting base 11, avoiding product tilting that may occur with single-point positioning. Multiple positioning points form a "three-point positioning" or "multi-point constraint," ensuring the product remains stable during testing, which is particularly suitable for large-size LCDs or multi-pin products. By adjusting the number and spacing of the positioning ports 13, different sized LCDs can be accommodated, enhancing the device's versatility.

[0066] Specifically, when the positioning port 13 is a dual positioning port 13, the dual positioning ports 13 are diagonally arranged (such as the upper left corner and the lower right corner) to restrict translation and rotation; when the positioning port 13 is a triple positioning port 13, the triple positioning ports 13 are triangularly distributed to provide more stable three-point positioning. Metal bushings (such as copper alloy) are embedded at the edges of the positioning ports 13 to prevent long-term insertion and removal wear from causing a decrease in positioning accuracy. Furthermore, magnets (such as neodymium iron boron magnets) are embedded within the positioning ports 13, working in conjunction with the metal positioning plates on the LCD glass to achieve automatic alignment and pre-fixation.

[0067] Furthermore, the material of the test subject 21 is bakelite.

[0068] In this embodiment, bakelite (phenolic plastic) has the characteristics of good insulation, high mechanical strength, and high temperature resistance, making it suitable as the main material of the test fixture 20. The test body 21 is made of bakelite to prevent short circuits caused by conductivity, ensuring that the detection circuit is only connected through the PIN pins, thus improving safety. Furthermore, bakelite has high mechanical strength and can withstand the pressure when the PIN pins are clamped, preventing deformation of the test body 21 that could lead to pin misalignment.

[0069] Furthermore, the test fixing plate 10 is made of transparent plastic.

[0070] In this embodiment, the test fixing plate 10 is made of transparent plastic, which facilitates the operator's observation of the testing process, such as confirming whether the product is installed correctly and whether the PIN pins are making good contact. The transparent material allows the operator to visually check the product position without disassembling the device, reducing repeated testing due to improper installation. If an abnormality occurs during the testing process, the transparent fixing plate can be used to quickly determine whether it is a mechanical fault (such as a stuck PIN pin or a tilted product), shortening downtime for troubleshooting and improving production efficiency.

[0071] Specifically, the transparent plastic can be PVC sheet, acrylic sheet, or PC sheet. PVC sheet is low in cost and suitable for normal environments; acrylic sheet has better impact resistance than PVC and is suitable for high-cleanliness workshops; PC sheet has strong impact resistance and high temperature resistance, making it suitable for complex production environments.

[0072] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. An alarm detection device for preventing multiple pin and missing pin test on LCD, characterized in that, include: Test mounting plate; A test fixture is mounted on the test fixing plate. The test fixture includes a test body, a connecting pin group, two sets of missing pin detection pins, two sets of multi-pin detection pins, two power supplies, a first alarm, and a second alarm. The connecting pin group, the two sets of multi-pin detection pins, and the two sets of missing pin detection pins are all connected to the test body. The connecting pin group is horizontally arranged. The two sets of missing pin detection pins are located on opposite sides of the edge of the connecting pin group. The two sets of multi-pin detection pins are located on the side of the two sets of missing pin detection pins away from the connecting pin group. The two sets of missing pin detection pins are electrically connected to one of the power supplies and the first alarm, and the two sets of multi-pin detection pins are electrically connected to the other power supply and the second alarm.

2. The LCD feet-up test alarm detection device according to claim 1, wherein, Both the few-pin detection PIN and the many-pin detection PIN have a double-layer structure.

3. The LCD feet-up test alarm detection device according to claim 2, wherein, Each set of missing pin detection pins includes two missing pin detection pins connected in parallel and electrically connected to a power supply and the first alarm.

4. The LCD feet-up test alarm detection device according to claim 1, wherein, The number of missing pin detection pins is multiple, and the multiple missing pin detection pins are arranged in parallel with the connecting pin group, and are electrically connected to the power supply and the first alarm.

5. The LCD feet-up test alarm detection device according to claim 1, wherein, The test fixture also includes a micro switch, which is connected to the test body and located below the connecting PIN pin group. The micro switch is connected in series with the power supply and the first alarm.

6. The LCD feet-up test alarm detection device according to claim 1, wherein, The test mounting plate is provided with a mounting base, which is located on one side of the test body and the connecting PIN pin group. The mounting base is recessed with a mounting groove for installing the inspection product.

7. The LCD feet-up test alarm detection device according to claim 6, wherein, The test mounting plate has a positioning port located on one side of the mounting base. The positioning port is used to check the positioning of the product.

8. The LCD feet-up test alarm detection device according to claim 7, wherein, The number of positioning ports is multiple, and the multiple positioning ports are arranged at intervals.

9. The LCD feet-up test alarm detection device according to claim 1, wherein, The material of the test subject is bakelite.

10. The LCD feet-up test alarm detection device according to claim 1, wherein, The test mounting plate is made of transparent plastic.

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