A liquid crystal panel movement detection fixture

Abstract

This utility model discloses a liquid crystal panel moving testing fixture, belonging to the field of liquid crystal panel testing technology. The fixture includes a mounting platform, a guide rail fixed to the mounting platform, a probe holder slidably mounted on the guide rail, a removable elastic probe inserted into the probe holder, a clamping block that elastically presses a flexible circuit board against the rear end of the probe, and a mounting platform for supporting and fixing the liquid crystal panel. The front end of the probe is pressed against the detection point of the liquid crystal panel, and the other end of the flexible circuit board is connected to an external testing circuit via a piano cover, forming a quickly replaceable testing path. This utility model utilizes the cooperation between the elastic probe and the clamping block to achieve a highly reliable, low-contact-resistance electrical connection; the probe holder as a whole can move along the guide rail to adapt to different testing positions; the pluggable probe structure facilitates maintenance, significantly improving testing efficiency and reducing testing costs.

Description

Technical Field

[0001] This utility model relates to the field of liquid crystal panel testing technology, and in particular to a liquid crystal panel movement detection fixture. Background Technology

[0002] Existing LCD panel backlight testing devices mostly use flexible printed circuit boards (FPCs) to directly press onto the screen's gold fingers to complete the electrical connection. In actual production, it has been found that:

[0003] (1) FPC is prone to fatigue after repeated bending, which leads to deviation in the crimping position;

[0004] (2) The manufacturing precision and bonding error of FPC directly affect the test accuracy;

[0005] (3) Frequent replacement of FPC results in high testing costs and long cycles.

[0006] Therefore, there is a need for a testing fixture that is simple in structure, reliable in pressing, allows for quick replacement of parts, and can be moved as a whole. Utility Model Content

[0007] The purpose of this invention is to provide a liquid crystal panel movement detection fixture, thereby solving the aforementioned problems existing in the prior art.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] A liquid crystal panel movement detection fixture, comprising:

[0010] Installation platform;

[0011] Guide rails fixed to the mounting platform;

[0012] A probe holder that is slidably mounted on a guide rail;

[0013] The probe is inserted into the probe holder. The probe has a flexible rear end and a front end for pressing against the LCD panel.

[0014] The clamping block located on the rear side of the probe holder is used to elastically press the flexible circuit board against the rear end of the probe to form an electrical connection;

[0015] The mounting platform, located below the probe and fixed to the mounting platform, is used to support the LCD panel under test;

[0016] The probe, flexible circuit board, and clamping block are arranged sequentially along the same axis to form a replaceable elastic crimping detection path.

[0017] In some specific embodiments, an elastic long groove is formed on the rear end face of the probe holder, and the clamping block is placed in the elastic long groove and can move in a direction perpendicular to the probe axis to adjust the clamping force on the flexible circuit board.

[0018] In some specific embodiments, the probe includes a positioning probe and a detection probe. The positioning probe is located on the outermost side of the probe holder, and its tip is raised to abut against the edge of the liquid crystal panel to achieve positioning. The detection probe is located inside the positioning probe, and its tip is in direct contact with the detection point of the liquid crystal panel.

[0019] In some specific embodiments, the probe holder is provided with a through-hole interface, including an upper insertion interface and a lower insertion interface. The probe is inserted from the upper insertion interface, and the lower end passes through the lower insertion interface and protrudes from the bottom surface of the probe holder, thereby achieving front-to-back positioning and preventing left-to-right wobbling.

[0020] In some specific embodiments, each probe has a bent portion at its upper end, which snaps into the edge of the upper insertion interface to form a detachable fixed connection.

[0021] In some specific embodiments, one end of the flexible circuit board is sandwiched between the rear end of the probe and the clamping block, and the other end is fixedly connected to the piano cover, forming a complete signal path from probe → flexible circuit board → piano cover → external detection circuit.

[0022] In some specific embodiments, the clamping block has a flange on the side facing the probe, and the flange engages with the annular groove at the rear end of the probe to prevent the probe from moving axially during the detection process.

[0023] In some specific embodiments, the guide rail extends along a first direction, and the probe holder is slidably mounted on the guide rail by a slider, so that the probe can be adjusted in horizontal position relative to the liquid crystal panel.

[0024] In some specific embodiments, the mounting platform and the probe holder are arranged vertically in parallel.

[0025] In some specific embodiments, each of the four corners of the mounting platform is provided with a fixing screw, which abuts against the bottom surface of the guide rail, and is used to adjust the overall level of the guide rail and probe relative to the liquid crystal panel.

[0026] The beneficial effects of this utility model are:

[0027] (1) High reliability: The elastic probe rear end forms a constant pressure contact with the clamping block, resulting in low contact resistance, stable signal, and significantly reduced false detection rate;

[0028] (2) Easy maintenance: The probe adopts a plug-in structure, which can be quickly replaced without disassembling the fixture, reducing downtime;

[0029] (3) Flexible movement: The probe holder slides along the guide rail and can be quickly aligned in the X direction to adapt to various sizes and multi-point detection needs;

[0030] (4) Cost reduction: The standardized design of probes and clamping blocks and the strong versatility of spare parts reduce FPC losses and inventory pressure;

[0031] (5) High efficiency in debugging: The installation platform is equipped with height adjustment screws at the four corners, which can quickly adjust the overall level and shorten the line change time;

[0032] (6) Compact structure: All functional components are integrated on the installation platform, which is small in size and easy to be arranged in online and automated equipment. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the probe mounting position according to the present invention;

[0034] Figure 2 This is a schematic diagram of the shape of the positioning probe of the present invention;

[0035] Figure 3 This is a schematic diagram of the shape of the detection probe of the present invention;

[0036] Figure 4 This is a schematic diagram of the probe holder structure of the present invention;

[0037] Figure 5 This is a schematic diagram of the probe insertion of the present invention;

[0038] Figure 6 This is a cross-sectional view of the circuit connection effect of the present invention;

[0039] Figure 7 This is a schematic diagram of the fixture of the present invention without the flexible circuit board installed;

[0040] Figure 8 This is a schematic diagram of the fixture mounting the flexible circuit board of the present invention.

[0041] In the attached diagram, 1 is the probe holder; 2 is the probe; 2a is the positioning probe; 2b is the detection probe; 3 is the elastic long groove; 4 is the mounting platform; 5 is the upper insertion interface; 6 is the lower insertion interface; 7 is the clamping block; 8 is the flexible circuit board; 9 is the piano cover; 10 is the guide rail; and 12 is the mounting platform. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0043] Reference Figures 1 to 8 The liquid crystal panel movement detection fixture shown includes:

[0044] Install platform 12;

[0045] Guide rail 10 fixed on mounting platform 12;

[0046] The probe holder 1 is slidably mounted on the guide rail 10;

[0047] The probe 2 is inserted into the probe holder 1. The probe 2 has a flexible rear end and a front end for pressing against the LCD panel.

[0048] The clamping block 7, located on the rear side of the probe holder 1, is used to elastically press the flexible circuit board 8 against the rear end of the probe 2 to form an electrical connection.

[0049] The mounting platform 4, located below the probe 2 and fixed on the mounting platform 12, is used to support the LCD panel to be tested.

[0050] The probe 2, flexible circuit board 8 and clamping block 7 are arranged sequentially along the same axis to form a replaceable elastic crimping detection path.

[0051] In this embodiment, the mounting platform 12 serves as the reference surface for the entire fixture and is simultaneously locked to the downstream automated production line via a T-slot or threaded hole.

[0052] The guide rail 10 is 7mm wide and 200mm long, with a rated dynamic load of 1.9kN. It is fixed by using an M4×12 cylindrical head socket head cap screw, which passes through the countersunk hole of the mounting platform 12 from below and locks into the threaded bottom hole of the guide rail 10. After assembly, the straightness is ≤0.01mm / 100mm.

[0053] Slider: A low-profile slider that matches the guide rail, with an M4 threaded hole tapped on the upper surface for connecting the probe holder 1.

[0054] Top surface of probe holder 1: 100 equally spaced upper insertion interfaces 5 in total, with aperture... Used for snapping together the bent part of probe 2;

[0055] Bottom surface: A bottom insertion interface 6 is provided at the corresponding position, with a diameter of... Used for guiding the lower end of probe 2;

[0056] Back side: A longitudinally milled elastic groove 3, 0.3 mm wide and 2.8 mm deep, is used to accommodate the clamping block 7 and allow it to float by ±2 mm.

[0057] The probe holder 1 is connected to the slider: the bottom of the holder has an M4×8 threaded hole, which is locked to the guide rail slider by screws to achieve overall movement.

[0058] The rear end of probe 2 mates with the flange of clamping block 7;

[0059] Bending section: 90° bend, 2mm in length, used to hook onto the edge of the upper insertion interface 5.

[0060] The probes include: Positioning probes 2a: only the outermost two, with the tips pointing upwards at 30°. The positioning probes work in conjunction with the camera for positioning, with minimal error, ensuring precise positioning.

[0061] Detection probe 2b: The remaining 100 probes are horizontal and directly pressed into the panel PAD.

[0062] Insertion and removal life ≥ 500,000 times.

[0063] Clamping block 7 is made of AL6061 aluminum with nickel plating to prevent oxidation.

[0064] Shape: Rectangular prism 34*10.1*2.9, with a 1mm high flange integrally formed at the front end, which engages with the annular groove at the rear end of the probe 2; the rear end is tapped with an M3 threaded hole and connected to the side wall of the elastic long groove 3 of the probe holder 1 through a headless screw, so as to achieve adjustable pressure.

[0065] Elastic source: Built-in at the bottom of the long groove Silicone gaskets provide a continuous clamping force of 0.3-0.5N.

[0066] Flexible circuit board 8 structure: double-layer glue-free electrolytic copper FPC, thickness 0.12mm, line width / spacing 0.1mm / 0.1mm; one end corresponds one-to-one with the rear end of probe 2; the other end: soldered connector, which is plugged into the inner row of females of piano cover 9 to form a complete signal link of "probe → FPC → piano cover → external machine".

[0067] The mounting platform 4 has a plane size of 34*0.77mm, with a 0.5mm wide vacuum adsorption groove machined on the upper surface by CNC machining, and the groove array spacing is 10mm; it is connected to the mounting platform 12 by fixing with M4 screws to ensure that the parallelism with the probe holder 1 is ≤0.02mm.

[0068] The center of the flange of the clamping block 7 also falls on the Z-axis, ensuring that the clamping force is transmitted along the axis and avoiding poor contact caused by lateral force.

[0069] The aforementioned coaxial design eliminates the need to readjust the XYZ three-dimensional coordinates when inserting or removing probes or replacing FPCs, achieving true "plug and play".

[0070] Through the synergy of the above eight modules, this fixture forms a testing pathway that is "movable as a whole, allows for quick needle replacement, and enables flexible crimping," meeting the requirements for high-speed, high-precision, and low-maintenance online LCD panel lighting tests.

[0071] In some specific embodiments, the rear end face of the probe holder 1 is provided with an elastic long groove 3, and the clamping block 7 is placed in the elastic long groove 3 and can move in a direction perpendicular to the axis of the probe 2 to adjust the clamping force on the flexible circuit board 8.

[0072] In some specific embodiments, the probe 2 includes a positioning probe 2a and a detection probe 2b. The positioning probe 2a is located on the outermost side of the probe holder 1, and its tip is raised to abut against the edge of the liquid crystal panel to achieve positioning. The detection probe 2b is located inside the positioning probe 2a, and its tip is in direct contact with the detection point of the liquid crystal panel.

[0073] In some specific embodiments, the probe holder 1 is provided with a through-hole interface, including an upper insertion interface 5 and a lower insertion interface 6. The probe 2 is inserted from the upper insertion interface 5, and its lower end passes through the lower insertion interface 6 and protrudes from the bottom surface of the probe holder 1, so as to achieve front-to-back positioning and prevent left-to-right shaking.

[0074] In some specific embodiments, each probe 2 has a bent portion at its upper end, which is snapped into the edge of the upper insertion interface 5 to form a detachable fixed connection.

[0075] In some specific embodiments, one end of the flexible circuit board 8 is sandwiched between the rear end of the probe 2 and the clamping block 7, and the other end is fixedly connected to the piano cover 9, forming a complete signal path from probe 2 → flexible circuit board 8 → piano cover 9 → external detection circuit.

[0076] In some specific embodiments, the clamping block 7 has a flange on the side facing the probe 2, and the flange cooperates with the annular groove at the rear end of the probe 2 to prevent the probe 2 from moving axially during the detection process.

[0077] In some specific embodiments, the guide rail 10 extends along a first direction, and the probe holder 1 is slidably mounted on the guide rail 10 by a slider, so that the probe 2 can be adjusted horizontally relative to the liquid crystal panel.

[0078] In some specific embodiments, the mounting platform 4 and the probe holder 1 are arranged vertically in parallel.

[0079] In some specific embodiments, each of the four corners of the mounting platform 12 is provided with a height adjustment screw, which abuts against the bottom surface of the guide rail 10 to adjust the overall level of the guide rail 10 and the probe 2 relative to the liquid crystal panel.

[0080] I. Working Principle of this Utility Model

[0081] Mechanical-Electrical Integration Path

[0082] The installation platform 12 → guide rail 10 → probe holder 1 → probe 2 → flexible circuit board 8 → piano cover 9 → external test host forms a movable and quickly replaceable flexible crimping test link.

[0083] Three-point positioning - crimping principle

[0084] Coarse positioning: The positioning probe 2a is tilted up 30° and touches the edge of the LCD panel glass to achieve coarse positioning of ±0.05mm.

[0085] Precise positioning: The detection probe 2b is horizontal and relies on its own 1mm elastic stroke to form a stable contact with the panel PAD.

[0086] Constant pressure maintenance: The clamping block 7 adjusts the clamping force in the elastic long groove 3 by using a headless screw, so that the flexible circuit board 8 and the probe rear end maintain a constant pressure of 0.3-0.8N, and the contact resistance is <20mΩ.

[0087] Overall movement compensation

[0088] The probe holder 1 slides laterally on the guide rail 10 via a slider, allowing for quick alignment with different detection points without the need to disassemble and reassemble the fixture.

[0089] Level closed-loop adjustment

[0090] The height adjustment screws at the four corners of the mounting platform 12 abut against the spherical surface of the bottom of the guide rail 10, forming a four-point support fine-tuning mechanism; with the help of a dial indicator, the overall levelness can be calibrated within 30 seconds, ensuring that the parallelism between all probes and the panel is ≤0.03mm.

[0091] II. Working Method of this Utility Model

[0092] (Taking online lighting test as an example)

[0093] Step 1: Loading materials

[0094] a) Place the LCD panel to be tested on platform 4;

[0095] b) Turn on the vacuum pump, vacuum groove adsorbs and fixes the panel, and confirm that the adsorption indicator light is on.

[0096] Step 2: Coarse Positioning

[0097] a) Manual or servo motor drive probe holder 1 to move along guide rail 10 to the edge of panel;

[0098] b) The positioning probe 2a lifts its tip to touch the edge of the panel glass first, completing the coarse positioning in the X / Y direction.

[0099] Step 3: Precise Positioning

[0100] a) Continue to fine-tune the guide rail slider so that the probe 2b is facing the panel PAD;

[0101] b) Observe the CCD alignment system and confirm that the deviation between all probes and the center of the PAD is <0.02mm.

[0102] Step 4: Crimp and connect to power

[0103] a) Tighten the headless screw of the clamping block 7, and the flexible circuit board 8 is pressed against the rear end of the probe to form an electrical connection;

[0104] b) The external test host outputs a lighting signal to the panel through the piano cover 9 to start the lighting test.

[0105] Step 5: Detection and Judgment

[0106] a) The host collects brightness, chromaticity, and dead pixel data in real time;

[0107] b) If an anomaly is detected, the system will automatically mark it as NG and record its coordinates; qualified products will be marked as OK.

[0108] Step 6: Quick cable replacement

[0109] a) Loosen the clamping block 7 and pull out the probe 2 that needs to be replaced (insertion and removal life ≥ 500,000 times);

[0110] b) Insert a new probe and repeat steps 2-5. The total time for changing the wires should be less than 1 minute.

[0111] Step 7: Levelness Recheck

[0112] Each time the panel size is changed, use a dial indicator to check the parallelism between the probe and the panel. If necessary, turn the four corner height adjustment screws to complete the compensation within 30 seconds.

[0113] Based on the above working principles and methods, this fixture achieves a high-speed, high-precision, and low-maintenance LCD panel lighting detection process that is "easy to use with a single plug, easy to adjust with a single slide, and easy to lock with a single turn".

[0114] By adopting the above-disclosed technical solution of this utility model, the following beneficial effects are obtained:

[0115] (1) High reliability: The elastic probe rear end forms a constant pressure contact with the clamping block, resulting in low contact resistance, stable signal, and significantly reduced false detection rate;

[0116] (2) Easy maintenance: The probe adopts a plug-in structure, which can be quickly replaced without disassembling the fixture, reducing downtime;

[0117] (3) Flexible movement: The probe holder slides along the guide rail and can be quickly aligned in the X direction to adapt to various sizes and multi-point detection needs;

[0118] (4) Cost reduction: The standardized design of probes and clamping blocks and the strong versatility of spare parts reduce FPC losses and inventory pressure;

[0119] (5) High efficiency in debugging: The installation platform is equipped with height adjustment screws at the four corners, which can quickly adjust the overall level and shorten the line change time;

[0120] (6) Compact structure: All functional components are integrated on the installation platform, which is small in size and easy to be arranged in online and automated equipment.

[0121] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A liquid crystal panel movement detection jig, characterized by comprising: include: Installation platform (12); Guide rails (10) are fixed on the mounting platform (12); The probe holder (1) is slidably mounted on the guide rail (10); The probe (2) is inserted into the probe holder (1), and the probe (2) has an elastic rear end and a front end for pressing with the liquid crystal panel; The clamping block (7) located on the rear side of the probe holder (1) is used to elastically press the flexible circuit board (8) against the rear end of the probe (2) to form an electrical connection; The mounting platform (4), located below the probe (2) and fixed on the mounting platform (12), is used to support the LCD panel to be tested; The probe (2), flexible circuit board (8) and clamping block (7) are arranged along the same axis in sequence to form a replaceable elastic crimping detection path.

2. The liquid crystal panel movement detection tool of claim 1, wherein: The probe holder (1) has an elastic long groove (3) on its rear end face. The clamping block (7) is placed in the elastic long groove (3) and can move in a direction perpendicular to the axis of the probe (2) to adjust the clamping force on the flexible circuit board (8).

3. The liquid crystal panel movement detection tool of claim 2, wherein: The probe (2) includes a positioning probe (2a) and a detection probe (2b). The positioning probe (2a) is located on the outermost side of the probe holder (1), and its tip is raised to abut against the edge of the liquid crystal panel to achieve positioning. The detection probe (2b) is located inside the positioning probe (2a), and its tip is in direct contact with the detection point of the liquid crystal panel.

4. The liquid crystal panel movement detection tool of claim 3, wherein: The probe holder (1) is provided with an upper and lower through insertion interface, including an upper insertion interface (5) and a lower insertion interface (6). The probe (2) is inserted from the upper insertion interface (5), and the lower end passes through the lower insertion interface (6) and protrudes from the bottom surface of the probe holder (1) to achieve front and back positioning and prevent left and right shaking.

5. The liquid crystal panel movement detection fixture according to claim 4, characterized in that: Each probe (2) has a bent portion at its upper end, which is snapped into the edge of the upper insertion interface (5) to form a detachable fixed connection.

6. The liquid crystal panel movement detection tool of claim 1, wherein: One end of the flexible circuit board (8) is clamped between the rear end of the probe (2) and the clamping block (7), and the other end is fixedly connected to the piano cover (9), forming a complete signal path from probe (2) → flexible circuit board (8) → piano cover (9) → external detection circuit.

7. The liquid crystal panel movement detection tool of claim 6, wherein: The clamping block (7) has a flange on the side facing the probe (2), and the flange cooperates with the annular groove at the rear end of the probe (2) to prevent the probe (2) from moving axially during the detection process.

8. The liquid crystal panel movement detection tool of claim 1, wherein: The guide rail (10) extends along the first direction, and the probe holder (1) is slidably mounted on the guide rail (10) by a slider, so that the probe (2) can be adjusted horizontally relative to the liquid crystal panel.

9. The liquid crystal panel movement detection tool of claim 1, wherein: The mounting platform (4) and the probe holder (1) are arranged in parallel vertically.

10. The liquid crystal panel movement detection tool of any one of claims 1-9, wherein: The mounting platform (12) is provided with fixing screws at each of its four corners. The fixing screws abut against the bottom surface of the guide rail (10) and are used to adjust the level of the guide rail (10) and the probe (2) relative to the liquid crystal panel.

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