Flexible test probe and test fixture for mini led backlight module

Abstract

The application discloses a flexible test probe and test fixture for a MINI LED backlight module, which comprises a test base, the upper end face of the test base is fixed with a support body, a positioning groove is arranged directly below the support body on the test base, a loading plate is fixed in the positioning groove and used for horizontally placing the LED backlight module to be detected, a pressure sensor is arranged below the loading plate, real-time monitoring can be conveniently conducted during the pressure connection process, and the change of the pressure value is observed, auxiliary clamping jaws are arranged on the test base at the positions on the two sides of the loading plate, the auxiliary clamping jaws are used for fine positioning of the LED backlight module, a test fixture assembly is installed on the support body, and a plurality of test probes are arranged below the test fixture assembly.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of screen module detection equipment, and specifically relates to a flexible test probe for a MINI LED backlight module and a test fixture. BACKGROUND

[0002] At present, with the rapid development of display-related electronic products such as smart phones, tablet computers, notebooks, high-definition televisions and smart watches, the market demand for display screen modules in the DISPLAY industry is also increasing. This puts forward higher requirements on the production rate, yield rate and the like of the display screen manufacturers. In the production process of the display screen, the detection link is directly related to the production speed, yield rate and quality of the display screen. The main function is to press the display screen with a flexible circuit board pressure plate to perform a function test, thereby directly identifying whether the product is a good product. However, at present, most detection fixtures adopt a hard pressure connection form of shaft pressure hydraulic (or pneumatic) to detect the screen module, which is easy to cause damage to the product by pressure connection, and under this influence, the service life of the test probe is low, and the production cost of the enterprise is increased.

[0003] Therefore, the skilled in the art provides a flexible test probe for a MINI LED backlight module and a test fixture to solve the problems raised in the background. SUMMARY

[0004] To achieve the above-mentioned purpose, the application provides the following technical scheme: a flexible test probe for a MINI LED backlight module and a test fixture, comprising: a test base, the upper end face of the test base is fixed with a support body, a positioning groove is arranged below the support body on the test base, a loading plate is fixed in the positioning groove, and the LED backlight module to be detected is horizontally placed; a pressure sensor is arranged below the loading plate, so as to facilitate real-time monitoring during the pressure connection process and observe the change of the pressure value, auxiliary clamping jaws are arranged on both sides of the loading plate on the test base, the auxiliary clamping jaws are used for fine positioning of the LED backlight module, a test fixture assembly is installed on the support body, and a plurality of test probes arranged in an array are arranged below the test fixture assembly.

[0005] Further, as preferred, the test fixture assembly comprises: an axle pressing plate horizontally arranged in the support body, limit rods vertically and symmetrically fixed at both sides of the support body, the axle pressing plate slidingly sleeved on the limit rods, guide rails symmetrically and obliquely fixed in the support body, a transmission hole body opened in the axle pressing plate, the axle pressing plate slidingly arranged in the transmission hole body, a pressing piece laterally slidingly arranged in the transmission hole body, one end surface of the pressing piece parallel to the guide rail and abutting against the guide rail through a roller, and a supporting spring connected between the pressing piece and the inner wall of the transmission hole body; the test probe is mounted in the middle of the lower end surface of the axle pressing plate, a base is fixed to the upper end surface of the support body, air pressure boosters are symmetrically arranged on the base, and an airflow bin is fixed to the lower end surface of the base and in communication with the air pressure boosters, a discharge port is arranged directly below the airflow bin; a flow resistance device is further arranged on the lower end surface of the axle pressing plate, and visual positioning devices are arranged at both sides of the lower end surface of the axle pressing plate.

[0006] Further, as preferred, the flow resistance device comprises: a flow resistance plate made of soft elastoplastic material, a plurality of telescopic cylinders vertically connected above the axle pressing plate, a connecting column slidingly arranged in each of the telescopic cylinders, one end of the connecting column hingedly connected to the flow resistance plate, and a telescopic guide frame further arranged in the support body, the telescopic guide frame cover-connected outside the airflow bin and fixed with the axle pressing plate, and the telescopic guide frame arranged as a two-section telescopic structure, a plurality of air outlets arranged on the telescopic guide frame.

[0007] Further, as preferred, each of the air outlets is independently opened or closed.

[0008] Further, as preferred, air flow pipes are vertically fixed at both sides of the support frame, one end of each of the air flow pipes fixedly connected to the telescopic guide frame, and the other end of each of the air flow pipes sealingly communicated with a gas supply tank.

[0009] Further, as preferred, an exhaust pipe is further arranged on the air flow pipe through a three-way valve.

[0010] Further, as preferred, the test probe comprises: a detection head, a conductive sheet arranged below the inside of the detection head, clamping pieces symmetrically and rotatably arranged in the detection head for clamping and holding both ends of the conductive sheet, a pressure boosting capsule embedded above the conductive sheet in the detection head, an air inlet pipe vertically and in communication with the upper end of the pressure boosting capsule, a flow reversing cavity fixed to one side of the detection head, the flow reversing cavity connected with the pressure boosting capsule, an inner plug slidingly arranged in the flow reversing cavity, and a hydraulic telescopic piece fixed outside the flow reversing cavity and connected with the inner plug.

[0011] Furthermore, as a preferred embodiment, an isolation liner is slidably disposed inside the transfer chamber, the isolation liner is fixed to the hydraulic telescopic component, and an inner spring connects the isolation liner and the inner plug.

[0012] Furthermore, as a preferred embodiment, a flow-retarding chamber can be formed between the isolation liner and the inner plug, and an auxiliary annular cavity is sleeved over the flow-transfer chamber. The flow-retarding chamber is connected to the auxiliary annular cavity, and a sealing plug is slidably disposed in the auxiliary annular cavity.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The flexible pressing action used in this invention drives the test probe to contact the LED backlight module to be tested. The test probe is pressed down by the air pressure booster under continuous exhaust and the flow obstruction device. In particular, the wind force driving intensity can be adjusted by changing the frame shape of the flow obstruction plate in the flow obstruction device, and each exhaust port can discharge the generated airflow in a timely manner.

[0015] 2. The symmetrically arranged airflow pipes in this invention can not only assist in air supply and pressurization to improve the wind driving strength, but also discharge the obstructed airflow of the baffle plate, thereby achieving precise control of the pressing pressure.

[0016] 3. The test probe in this invention can contact the LED backlight module through the elastic deformation of the conductive sheet, and the pressure bladder can expand and contract freely to achieve a flexible contact effect and avoid pressure damage to the LED backlight module. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the test fixture assembly in this invention;

[0019] Figure 3 This is a schematic diagram of the flow-blocking device in this invention;

[0020] Figure 4 This is a schematic diagram of the structure of the test probe in this invention;

[0021] In the diagram: 1. Test base; 11. Support body; 12. Loading plate; 13. Auxiliary claw; 2. Test fixture assembly; 21. Shaft pressure plate; 22. Limit bar; 23. Guide rail; 24. Support spring; 25. Air booster; 26. Base; 27. Airflow chamber; 3. Test probe; 31. Probe head; 32. Conductive sheet; 33. Clamp; 34. Inlet pipe; 35. Pressure bladder; 36. Flow transfer chamber; 37. Inner plug; 38. Isolation liner; 39. Hydraulic telescopic component; 310. Auxiliary annular cavity; 4. Flow obstruction device; 41. Flow obstruction plate; 42. Telescopic cylinder; 43. Connecting column; 44. Exhaust port; 45. Telescopic guide frame; 46. Airflow pipe; 47. Exhaust pipe; 48. Air supply tank. Detailed Implementation

[0022] Please see Figure 1 In this embodiment of the invention, a flexible test probe and test fixture for a MINI LED backlight module are provided, comprising: a test base 1, a support body 11 fixed on the upper surface of the test base 1, a positioning groove provided on the test base 1 directly below the support body 11, a mounting plate 12 fixed in the positioning groove for horizontal placement of the LED backlight module to be tested; a pressure sensor provided below the mounting plate 12 for real-time monitoring and observation of pressure value changes during the pressing process; auxiliary claws 13 provided on both sides of the mounting plate 12 on the test base 1 for fine-tuning and positioning of the LED backlight module; a test fixture assembly 2 mounted on the support body 11, and a plurality of test probes 3 arranged below the test fixture assembly 2, wherein flexible testing of various LED backlight modules can be performed by replacing test probes of different specifications.

[0023] In this embodiment, the test fixture assembly 2 includes: a axial pressure plate 21, horizontally disposed within the support body 11; limit bars 22 vertically and symmetrically fixed on both sides of the support body 11; the axial pressure plate 21 slidably sleeved on the limit bars 22; guide rails 23 symmetrically and obliquely fixed within the support body 11; a transmission hole is formed within the axial pressure plate 21; the axial pressure plate 21 is slidably disposed within the transmission hole; a pressing member is laterally slidably disposed within the transmission hole; one end face of the pressing member is parallel to the guide rail 23 and abuts against the guide rail via rollers; a support spring 24 is connected between the pressing member and the inner wall of the transmission hole; the two guide rails are V-shaped; and the support spring can prevent the axial pressure plate from being subjected to external force through its elastic force. The test probe 3 is installed in the middle of the lower end face of the axial pressure plate 21. The upper end face of the support body 11 is fixed with a base 26. Air boosters 25 are symmetrically arranged on the base 26. An airflow chamber 27 is fixed on the lower end face of the base 26. The airflow chamber 27 is connected to the air boosters 25. An exhaust port is provided directly below the airflow chamber 27. A flow obstruction device 4 is also provided on the lower end face of the axial pressure plate 21. Visual positioning devices (not shown in the figure) are provided on both sides of the flow obstruction device 4 on the lower end face of the axial pressure plate 21. That is to say, when the air boosters work independently or synchronously, the vertical wind force is provided through the airflow chamber. At this time, the flow obstruction device can form a pushing force on the axial pressure plate, thereby realizing flexible pressing test.

[0024] In a preferred embodiment, the flow-blocking device 4 includes: a flow-blocking plate 41 made of a soft, elastic, and plastic material; multiple telescopic cylinders 42 vertically connected above the axial pressure plate 21; a connecting column 43 slidably disposed within each telescopic cylinder 42; one end of the connecting column 43 hinged to the flow-blocking plate 41; and a telescopic guide frame 45 disposed within the support body 11. The telescopic guide frame 45 covers the airflow chamber 27 and is fixed to the axial pressure plate 21. The telescopic guide frame 45 is configured as a two-section telescopic structure, and multiple exhaust ports 44 are arranged on the telescopic guide frame 45. The flow-blocking plate can be in an arc-shaped concave state or an arc-shaped convex state through the sliding cooperation of the connecting columns in each telescopic cylinder, and can also be in a corrugated or horizontal state, thus having a good elastic deformation effect.

[0025] In this embodiment, each of the exhaust vents 44 is opened or closed independently to control the exhaust speed of the wind-driven airflow, thereby effectively controlling the wind-driven intensity.

[0026] In this embodiment, airflow pipes 46 are also vertically fixed on both sides of the main support frame 11. One end of the airflow pipe 46 is fixedly connected to the telescopic guide frame 45, and the other end of the airflow pipe 46 is sealed and connected to the air supply tank 48.

[0027] In this embodiment, the airflow pipe 46 is also equipped with an exhaust pipe 47 via a three-way valve. That is, on the one hand, the airflow pipe can supply air laterally through the air supply tank, so that the vertical wind direction formed by the airflow chamber can converge at the baffle plate, thereby increasing the wind driving strength. On the other hand, the airflow pipe can exhaust the internal airflow through the exhaust pipe, so that the vertical wind direction formed by the airflow chamber can be fully dispersed at the baffle plate, thereby reducing the wind driving strength.

[0028] In a preferred embodiment, the test probe 3 includes: a probe head 31, a conductive sheet 32 ​​disposed at the lower part of the probe head 31, and a clamp 33 symmetrically rotated inside the probe head 31 for fixing and clamping both ends of the conductive sheet 32. The conductive sheet is made of an elastic conductive material, meaning that the conductive sheet can be horizontally retracted by adjusting the direction of the clamp without external force. A pressure-increasing bladder 35 is embedded in the probe head 31 at the upper side of the conductive sheet 32. The upper end of the pressure-increasing bladder 35 is vertically connected to an air inlet pipe 34. A flow-through cavity 36 is also fixed on one side of the head 31. The flow-through cavity 36 is connected to the pressure-increasing bladder 35. An inner plug 37 is slidably disposed in the flow-through cavity 36. A hydraulic telescopic component 39 is also fixed outside the flow-through cavity 36. One end of the hydraulic telescopic component 39 is connected to the inner plug 37. The pressure-increasing bladder is mainly supplied with air by the air intake pipe, which causes it to expand gradually. During the pressing test, when the conductive sheet is gradually pressed against the LED backlight module, the air intake pipe is closed, and the flow-through cavity can discharge the airflow in the pressure-increasing bladder into the flow-through cavity while communicating with the pressure-increasing bladder.

[0029] In this embodiment, an isolation liner 38 is slidably disposed inside the transfer chamber 36. The isolation liner 38 is fixed to the hydraulic telescopic member 39, and an inner spring is connected between the isolation liner 38 and the inner plug 37 to achieve flexible pressing.

[0030] In this embodiment, a flow buffer can be formed between the isolation liner 38 and the inner plug, and an auxiliary ring cavity 310 is sleeved on the flow transfer cavity. The flow buffer is connected to the auxiliary ring cavity 310, and a sealing plug is slidably disposed in the auxiliary ring cavity 310. In particular, under continuous pressing of the conductive sheet, the inner plug discharges the airflow in the flow buffer into the auxiliary ring cavity during relative displacement. At this time, the sealing plug in the auxiliary ring cavity can slide accordingly, thereby realizing the flexible testing of the test probe.

[0031] Specifically, the LED backlight module to be tested is placed horizontally on the carrier plate, and the auxiliary claws finely adjust its positioning. The axial pressure plate can be vertically displaced and pressed by the vertical wind force provided by the independent or synchronous operation of the air booster. During the pressing, the wind force can be changed by adjusting the connection shape of the flow obstruction device to achieve flexible pressing test. During the contact of the test probe, the conductive sheet is deformed by the expansion of the pressure bladder. During the pressing, the pressure bladder can discharge the internal gas into the transfer chamber, which facilitates the deformation recovery of the conductive sheet.

[0032] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A flexible test probe and test fixture for a MINI LED backlight module, characterized in that: It includes: Test base (1), the upper surface of the test base (1) is fixed with a support body (11), the test base (1) is provided with a positioning groove located directly below the support body (11), the positioning groove is fixed with a carrier plate (12) for horizontal placement of the LED backlight module to be tested; a pressure sensor is provided below the carrier plate (12) for real-time monitoring and observation of pressure value changes during the pressing process; auxiliary claws (13) are provided on both sides of the carrier plate (12) on the test base (1), the auxiliary claws (13) are used for fine-tuning and positioning of the LED backlight module; a test fixture assembly (2) is installed on the support body (11), and multiple test probes (3) are arranged below the test fixture assembly (2); The test fixture assembly (2) includes a axial pressure plate (21), which is horizontally disposed within the support body (11). Limit bars (22) are vertically and symmetrically fixed on both sides of the support body (11). The axial pressure plate (21) is slidably sleeved on the limit bars (22). A guide rail (23) is also symmetrically and obliquely fixed within the support body (11). A transmission hole is formed within the axial pressure plate (21), which is slidably disposed within the transmission hole. A pressing member is laterally slidably disposed within the transmission hole. One end face of the pressing member is parallel to the guide rail (23) and abuts against the guide rail via rollers. A support spring (24) is also connected between the pressure member and the inner wall of the transmission hole; the test probe (3) is installed in the middle of the lower end face of the axial pressure plate (21); the upper end face of the bracket body (11) is fixed with a base (26); air boosters (25) are symmetrically arranged on the base (26); and an airflow chamber (27) is fixed on the lower end face of the base (26); the airflow chamber (27) is connected to each of the air boosters (25); and an exhaust port is provided directly below the airflow chamber (27); a flow-blocking device (4) is also provided on the lower end face of the axial pressure plate (21); and visual positioning devices are provided on both sides of the flow-blocking device (4) on the lower end face of the axial pressure plate (21).

2. The flexible test probe and test fixture for a MINI LED backlight module according to claim 1, characterized in that: The flow obstruction device (4) includes a flow obstruction plate (41) made of soft elastic plastic material. Multiple telescopic cylinders (42) are vertically connected above the axial pressure plate (21). Each telescopic cylinder (42) has a connecting column (43) slidably installed inside it. One end of the connecting column (43) is hinged to the flow obstruction plate (41). A telescopic guide frame (45) is also installed inside the main body (11) of the support. The telescopic guide frame (45) covers the airflow chamber (27) and is fixed to the axial pressure plate (21). The telescopic guide frame (45) is configured as a two-section telescopic structure. Multiple exhaust ports (44) are arranged on the telescopic guide frame (45).

3. The flexible test probe and test fixture for a MINI LED backlight module according to claim 2, characterized in that: Each of the exhaust vents (44) can be opened or closed independently.

4. The flexible test probe and test fixture for a MINI LED backlight module according to claim 2, characterized in that: The two sides of the support body (11) are also vertically fixed with airflow pipes (46), one end of the airflow pipe (46) is fixedly connected to the telescopic guide frame (45), and the other end of the airflow pipe (46) is sealed and connected to the air supply tank (48).

5. The flexible test probe and test fixture for a MINI LED backlight module according to claim 4, characterized in that: An exhaust pipe (47) is also provided on the airflow pipe (46) via a three-way valve.

6. The flexible test probe and test fixture for a MINI LED backlight module according to claim 1, characterized in that: The test probe (3) includes a probe head (31), a conductive sheet (32) is disposed inside the lower part of the probe head (31), and a clamp (33) is symmetrically rotated inside the probe head (31) for fixing and clamping the two ends of the conductive sheet (32). A pressure bladder (35) is embedded in the probe head (31) at the upper side of the conductive sheet (32). An air inlet pipe (34) is vertically connected to the upper end of the pressure bladder (35). A flow transfer chamber (36) is also fixed on one side of the probe head (31). The flow transfer chamber (36) is connected to the pressure bladder (35). An inner plug (37) is slidably disposed in the flow transfer chamber (36). A hydraulic telescopic component (39) is also fixed outside the flow transfer chamber (36). One end of the hydraulic telescopic component (39) is connected to the inner plug (37).

7. The flexible test probe and test fixture for a MINI LED backlight module according to claim 6, characterized in that: An isolation liner (38) is slidably disposed inside the transfer cavity (36). The isolation liner (38) is fixed to the hydraulic telescopic component (39), and an inner spring is connected between the isolation liner (38) and the inner plug (37).

8. The flexible test probe and test fixture for a MINI LED backlight module according to claim 7, characterized in that: A flow buffer chamber can be formed between the isolation liner (38) and the inner plug, and an auxiliary annular cavity (310) is connected to the outer sleeve of the flow transfer cavity. The flow buffer chamber is connected to the auxiliary annular cavity (310), and a sealing plug is slidably disposed in the auxiliary annular cavity (310).

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