CN201909917U - Test fixture - Google Patents

Abstract

The embodiment of the utility model discloses a test fixture, which relates to the field of LCD test and is used for improving the test efficiency of the liquid crystal display panel. A test fixture, including a base, a carrier, a mounting frame and a signal input module; the base is used to carry the carrier and the signal input module; the carrier is used to carry the Test the liquid crystal display panel; the signal input module is used to contact the liquid crystal display panel to be tested through a probe and provide a test signal for the liquid crystal display panel to be tested; moreover, guide rails are arranged on the stage , the guide rails are located on two opposite sides of the platform, and the installation frame is slidably arranged on the guide rails. The scheme provided by the utility model is suitable for small-size LCD testing.

Description

Test Fixture

technical field

The utility model relates to the field of LCD (liquid crystal display) testing, in particular to a testing fixture.

Background technique

Liquid Crystal Display (LCD) has the characteristics of small size, low power consumption, no radiation, relatively low manufacturing cost, etc., and occupies a dominant position in the current flat panel display market.

In the production process of liquid crystal displays, it is necessary to test the liquid crystal display panels after the cutting steps to sort out defective products; at this time, it is necessary to provide some auxiliary tools for the liquid crystal display panels to be tested, such as test fixtures, to The above liquid crystal display panel provides a test platform and a test signal transfer channel.

FIG. 1 is a schematic diagram of a simplified model of an existing LCD test fixture. Commonly used LCD test fixtures at least include a pedestal 1, a carrier 2 arranged on the pedestal 1, an upper polarizer mounting frame 4 that can rotate around a rotating shaft 3 arranged on the carrier 2, and A signal input module 5 that provides test signals for the liquid crystal display panel. Wherein, the stage 2 is used to carry the liquid crystal display panel to be tested, and the backlight drive module, the backlight module and the lower polarizer are accommodated in the stage 2; the upper polarizer is installed on the upper polarizer mounting frame 4 .

Like this, when carrying out lighting test to liquid crystal display panel, rotate upper polarizer mounting frame 4 and make it parallel with platform 2, thereby make the upper polarizer on described upper polarizer mounting frame 4 and described carrier 2 The liquid crystal display panel to be tested is kept parallel, and then the alignment of the liquid crystal display panel to be tested is adjusted, and then the assembled liquid crystal display can be simulated to complete the test of the liquid crystal display panel.

In the process of using the above-mentioned LCD test fixture to realize the lighting test, the inventor found that at least the following problems existed in the prior art:

In the process of rotating the upper polarizer mount 4 and driving the upper polarizer to rotate to a state parallel to the liquid crystal display panel to be tested, the space span of the upper polarizer mount 4 is relatively large, and its position The adjustment process takes a long time, which further affects the efficiency of the liquid crystal display panel testing process.

Utility model content

The embodiment of the utility model provides a test fixture for improving the test efficiency of the liquid crystal display panel.

In order to achieve the above object, the embodiments of the present utility model adopt the following technical solutions:

A test fixture, including a base, a carrier, a mounting frame and a signal input module;

The base is used to carry the carrier and the signal input module;

The carrier is used to carry the liquid crystal display panel to be tested;

The signal input module is used to contact the liquid crystal display panel to be tested through a probe and provide a test signal for the liquid crystal display panel to be tested;

Moreover, guide rails are arranged on the carrier platform, and the guide rails are located on two opposite sides of the carrier platform, and the installation frame is slidably arranged on the guide rails.

The test fixture provided by the embodiment of the utility model utilizes the guiding function of the guide rail on the carrier platform, so that the installation frame arranged on the guide rail can slide along the guide rail in the horizontal direction. In the solution provided by the embodiment of the present invention, the installation frame only needs to do push-pull reciprocating motion in the horizontal direction, and since the linear motion speed of the installation frame is greater than the speed of the rotation around the axis, the installation frame The time for position adjustment is also shortened correspondingly, which helps to improve the test efficiency of the liquid crystal display panel.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only the present invention For some novel embodiments, those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative work.

Fig. 1 is the simplified model sketch map of existing LCD test fixture;

Fig. 2 is the three-dimensional schematic view of the test fixture in the utility model embodiment;

Fig. 3 is a schematic plan view of the test fixture in Fig. 2;

Fig. 4 is the structural representation of the longitudinal section of the test fixture along the A-A line in Fig. 2;

Fig. 5 is a three-dimensional schematic diagram of the upper polarizer mounting frame in Fig. 2;

Fig. 6 is a schematic plan view of the upper polarizer mounting frame in Fig. 5;

Fig. 7 is a side view of the upper polarizer mounting frame in Fig. 5;

Fig. 8 is a side sectional view of the signal input module and the eccentric mechanism in Fig. 2;

Fig. 9 is a schematic plan view of the probe base in Fig. 8;

Fig. 10 is a side view of the probe holder in Fig. 8;

Fig. 11 is a schematic plan view of the carrier platform in Fig. 2;

Fig. 12 is a schematic structural view of the Y-direction adjustment carrier in Fig. 11;

Fig. 13 is a schematic structural view of the operation platform in Fig. 11;

Reference signs: 1-base; 2-carrying platform; 3-rotating shaft; 4-upper polarizer mounting frame; 5-signal input module;

10-base; 11-side plate; 12-positioning block; 13-guiding shaft; 14-return spring; 20-carrier; 21-main carrier; 22-mobile carrier; Direction adjustment platform; 25-Y direction adjustment platform; 26-operation platform; 27-magnet; 28-location pin; 29-location pin hole; 30-up polarizer mounting frame; 31-slider; 32-pad 33-upper polarizer mounting plate; 34-upper polarizer cover; 35-magnet; 36-push-pull part; 40-signal input module; 41-probe; 42-probe seat; 43-bearing plate; 44-flange bearing; 45-location pin; 46-spring; 47-signal transfer circuit board; 51-rotating shaft; 52-eccentric block; 53-eccentric rolling bearing; 54-handle; 55-eccentric positioning block.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In order to improve the test efficiency of the liquid crystal display panel, the test fixture provided in the embodiment of the present invention includes a base, a stage, a mounting frame and a signal input module;

The base is used to carry the carrier and the signal input module;

The carrier is used to carry the liquid crystal display panel to be tested;

The signal input module is used to contact the liquid crystal display panel to be tested through a probe and provide a test signal for the liquid crystal display panel to be tested;

Moreover, guide rails are arranged on the carrier platform, and the guide rails are located on two opposite sides of the carrier platform, and the installation frame is slidably arranged on the guide rails.

In the embodiment of the present invention, taking the LCD test fixture as an example, the mounting frame is a polarizer mounting frame, preferably an upper polarizer mounting frame.

The upper polarizers appearing in the embodiments of the present invention all refer to the polarizers on the color filter substrate side, while the lower polarizers appearing later refer to the polarizers on the array substrate side.

Utilize the guiding effect of the guide rail on the main carrier in the above-mentioned test fixture, the upper polarizer mounting frame that is arranged on this guide rail can slide along the described guide rail in the horizontal direction; like this, the described upper polarizer mounting frame only Push-pull reciprocating motion is required in the horizontal direction, and the linear motion speed of the upper polarizer mounting frame is greater than the speed of rotation around the axis, so the time for adjusting the position of the upper polarizer mounting frame will be correspondingly shortened. It helps to improve the test efficiency of the liquid crystal display panel.

The following will take the mounting frame as the upper polarizer mounting frame as an example and further introduce the above test fixture in detail in combination with a series of drawings.

As shown in Figure 2, Figure 3 and Figure 4, the test fixture provided in the embodiment of the utility model mainly includes: a base 10, a carrier 20, an upper polarizer mounting frame 30 and a signal input module 40;

The base 10 is used to carry the carrier 20 and the signal input module 40;

Carrier 20 includes a main carrier 21 and a mobile carrier 22 arranged on the main carrier 21, said mobile carrier 22 is used to carry a liquid crystal display panel to be tested;

The signal input module 40 includes a probe 41, a probe holder 42 and a bearing plate 43 that can drive the probe holder 42 to move up and down; the signal input module 40 is used to connect the probe 41 with the liquid crystal display panel to be tested. contact and provide a test signal for the liquid crystal display panel to be tested;

Compared with the LCD test fixture shown in Fig. 1, the utility model mainly adjusts the structure of the upper polarizer mounting frame; as shown in Fig. Located on two opposite sides of the moving platform 22 , the upper polarizer mounting frame 30 in this embodiment is slidably disposed on the guide rail 23 .

As shown in FIG. 5, FIG. 6 and FIG. 7, the upper polarizer mounting frame 30 specifically includes: a slider 31 that can slide along the guide rail 23, an upper polarizer mounting plate 33 for placing the upper polarizer, and a A spacer 32 between the block 31 and the upper polarizer mounting plate 33 for adjusting the height between the slider 31 and the upper polarizer mounting plate 33 . When the height between the slider 31 and the upper polarizer mounting plate 33 needs to be adjusted, a spacer 32 with a suitable height can be selected and fixed between the slider 31 and the upper polarizer mounting plate 33 with screws.

As shown in Figures 5 and 6, an upper polarizer cover plate 34 is also provided on the upper polarizer mounting frame 30, the upper polarizer cover plate 34 is U-shaped, and is adsorbed to the upper polarizer mounting plate 33 by a magnetic material, It is used to fix the upper polarizer; the magnetic material can preferably adopt a magnet, such as the magnet 35 shown in FIG. 5 and FIG. 6 . In this way, the upper polarizer can be clamped between the upper polarizer mounting plate 33 and the upper polarizer cover plate 34 by utilizing the adsorption force of the magnet 35 when the upper polarizer is installed. The upper polarizer cover plate 34 can be made of cast iron, and further, a magnet opposite to the magnet 35 on the upper polarizer mounting plate 33 can be arranged on the upper polarizer cover plate 34 to enhance the adsorption force.

In addition, a push-pull portion 36 is provided on one side of the upper polarizer mounting plate 34 , and the push-pull portion 36 is used to push the upper polarizer mounting frame 30 to slide on the guide rail 23 conveniently.

The above-mentioned upper polarizer movement mechanism is installed with guide rails, sliders, pads, upper polarizer mounting plates and upper polarizer cover plates. Using the guiding function of the guide rails and sliders, the upper polarizer can be placed on the horizontal plane during the test process. Internal reciprocating motion. The use of guide rails and sliders makes it easy to pick and place the liquid crystal display panel to be tested during the operation; and the push-pull movement mode makes the movement of the upper polarizer mounting frame faster and more stable during the operation , improve work efficiency. In addition, the fixing method of the upper polarizer uses the upper polarizer mounting plate to install the magnetic material and the upper polarizer cover to form a suction fixation, which improves the original tape fixing method, enhances the aesthetics and maintenance convenience of the fixture, and is easy to disassemble Furthermore, the cleaning of the test fixture is facilitated.

It can be seen from FIG. 2 that the base 10 includes two side plates 11 arranged in parallel, and an eccentric mechanism is arranged between the two side plates 11, and the eccentric mechanism is used to control the up and down movement of the bearing plate. Specifically, the eccentric mechanism includes: a rotating shaft 51 located between the two side plates and perpendicular to the side plates, an eccentric block 52 that is connected in series on the rotating shaft 51 and can rotate with the rotating shaft 51, and the eccentric block 52 An eccentric rolling bearing 53 is provided at an end away from the rotating shaft 51 , and the eccentric rolling bearing 53 contacts and abuts against the bearing plate 43 .

One end of the rotating shaft 51 extends to the outside of the side plate 11 and is bent to form a handle 54 which can be manipulated by technicians. The other end is provided with an eccentric positioning block 55 . Corresponding to the eccentric positioning block 55 , a positioning block 12 is provided on the side plate 11 . As shown in Figure 8, the eccentric block 55 is used in conjunction with the positioning block 12 to position the eccentric block 52, that is, to position the eccentric mechanism, so that the bearing plate 43 is positioned by the eccentric rolling bearing 53 in the eccentric structure. position is fixed.

In addition, in the embodiment of the present utility model, the length of the eccentric block 52 is also adjusted; specifically, the length of the eccentric block 52 along the axial direction of the rotating shaft 51 is improved from the original 10mm to 30mm-80mm, that is, the eccentric The length of the area where the block 52 is in contact with the rotating shaft 51 is 30 mm to 80 mm, so that the eccentric block 52 and the rotating shaft 51 are more fully engaged and the stability of the eccentric mechanism is enhanced. Preferably, the length of the eccentric block 52 along the axial direction of the rotating shaft 51 is improved to 50 mm, which is not only convenient for installation, but also can fully engage the eccentric block 52 with the rotating shaft 51 . In addition, the contact between the eccentric mechanism and the bearing plate 43 is realized by rolling bearings. Since the movement process of the bearing plate 43 utilizes rolling transmission, the friction coefficient between the bearing plate 43 and the eccentric mechanism can be reduced, and the resistance of the contact surface can be increased. Abrasive.

Further, it can also be seen from FIG. 2 that four guide holes are provided on the bearing plate 43, corresponding to these four guide holes, four vertically arranged guide shafts 13 are provided on the base 10 ( Only one of the guide shafts is schematically drawn in Fig. 2, and the other three guide shafts are not shown); the cooperation of the guide hole and the guide shaft 13 can control the vertical movement of the bearing plate 43 in the vertical direction.

Compared with the existing LCD test fixture, the utility model embodiment also improves the number of guide holes in the test fixture: from the original 2 to an even number greater than 2, preferably the number of guide holes The number can be four, so as to avoid the shaking of the bearing plate 43 during the up and down movement and improve the stability of the bearing plate 43 .

As shown in Fig. 8, in the embodiment of the present utility model, a flange bearing 44 is provided on the bearing plate 43, and the flange bearing 44 is located below the bearing plate 43 and at a position corresponding to the guide hole; Use flange bearing on the bearing plate 43, can overcome the defective that common bearing comes off from guide hole easily after long time use. The use of flanged bearings simplifies the mounting method while enhancing the stability of the guided movement.

The guide shaft 13 is sleeved with a return elastic object, which can be the return spring 14 shown in Figure 8; one end of the return spring 14 is fixed on the base 10, and the other end is connected to the flange bearing 44 connected.

In the embodiment of the present invention, by installing the flange bearing on the bearing plate and cooperating with the guide shaft, the downward movement force generated by the eccentric mechanism is transmitted to the bearing plate, and then the bearing plate drives the test probe to move downward; Moreover, a return spring is installed below the bearing plate, so that when the eccentric mechanism returns to the initial position after the test, the elastic force of the return spring is used to push the bearing plate to move upward.

Using the cooperation of eccentric block, eccentric rolling bearing, handle and return spring, the rotation of the handle is transformed into the vertical up and down motion of the bearing plate, so as to form the probe seat required for the test process to move down with the bearing plate and probe after the test is completed. The reciprocating process in which the needle holder moves upward with the bearing plate.

Further, in the embodiment of the present utility model, improvements are also made to the probes in the above-mentioned test fixture and the probe holders for fixing the probes. Specifically, as shown in FIG. 8 , FIG. 9 and FIG. 10 , the probe base 42 is fixed under the bearing plate 43 by fasteners, and the fasteners may be screws; positioning pins are provided on the probe base 42 45, the bearing plate 43 is provided with a positioning hole correspondingly. During the installation process of the probe base, the positioning hole and the positioning pin 45 are used together to position the probe base to ensure its verticality.

In addition, an elastic object, such as a spring 46 in FIG. 10 , is provided between the probe base 42 and the bearing plate 43 . The two ends of the spring 46 respectively abut against the upper surface of the probe base 42 and the lower surface of the bearing plate 43 to generate a downward thrust to the probe base 42; The degree of tightness means that the height of the position of the probe base 42 can be fine-tuned, so as to realize the fine adjustment of the distance between the probe base 42 or the probe 41 and the liquid crystal panel to be tested.

In the embodiment of the present invention, the probe 41 installed on the probe base 42 is a double-ended probe, and the main part of the double-ended probe (indicated by a dotted line in FIG. 10 ) is fixed in the probe base 42; The probe head at one end of the double-headed probe is pressed against the signal transfer circuit board 47 in the signal input module, and the probe head at the other end exposes the lower surface of the probe holder 42, which can be connected with the liquid crystal display panel to be tested. touch.

The combination of the above-mentioned probes and probe holders is installed with double-ended probes and signal transfer PCBs. The probe heads at both ends of the double-ended probes are flexible, and the short probe heads are in contact with the signal transfer PCB for compression. , the long probe head is used to contact the signal test point on the liquid crystal display panel to be tested during the test process. The use of double-ended probes has better stability and strong durability; since there is no need to connect the probes to the signal transfer PCB through leads, the production of the probe base is also more convenient, and it is easy to replace during use. Easy maintenance.

Furthermore, in order to increase the versatility of the above-mentioned test fixture so that it can be applied to the test process of different types of LCDs, the carrier part is also improved in the embodiment of the present utility model.

As shown in FIG. 11 , the stage 20 includes: a main stage 21 and a movable stage 22 , and the movable stage 22 further includes: an X-direction adjustment stage 24 , a Y-direction adjustment stage 25 and an operation stage 26 . in,

The X-direction adjustment platform 24 can drive the Y-direction adjustment platform 25 and the operation platform 26 located above it to adjust the position in the X direction;

The Y direction adjustment platform 25 can drive the operation platform 26 above it to adjust its position in the Y direction perpendicular to the X direction; Group and lower polarizer and other structures;

The operation platform 26 is used to carry the liquid crystal display panel to be tested.

The main material of the above-mentioned carrier is made of bakelite, which can effectively prevent the damage of static electricity to electronic products.

As shown in FIG. 12 and FIG. 13 , magnetic materials are arranged on the Y-direction adjustment platform 25 and the operation platform 26, and the magnetic material preferably adopts a magnet 27, and the Y-direction adjustment platform 25 and the operation platform Positioning pins 28 and positioning pin holes 29 are set correspondingly on the 26. The cooperation of the positioning pin 28 and the positioning pin hole 29 can fix the position of the work platform during the test. Moreover, the magnet 27 on the Y-direction adjustment stage 25 is also corresponding in position to the magnet 27 on the operation stage 26, so that the operation stage 26 can be attached to the Y-direction adjustment stage by the adsorption force between the magnets. On stage 25.

The above platform structure adopts a structure in which the X and Y direction adjustment platforms are separated from the operation platform, and positioning pins and magnets are set on the Y direction adjustment platform to cooperate with the positioning pin holes and magnets on the operation platform; The positioning pins are positioned, and the magnets attract each other to generate suction to fix the work stage. In the embodiment of the present utility model, the matching structure of the magnet and the positioning pin is used to improve the fixing method between the original Y-direction adjustment platform and the operation platform through screws, which facilitates the installation and replacement of the operation platform; moreover, the platform The unique modular separation structure also makes the daily maintenance process, after cleaning or maintaining the internal backlight polarizer, etc., there is no need to perform secondary alignment adjustments on the Y-direction adjustment stage, which simplifies the maintenance method and facilitates maintenance.

In addition, since the operation platform and the probe base are independent structural units, when testing different types of LCDs, it is only necessary to replace the corresponding type of operation platform and probe base, which enhances the above test process. With the versatility.

The test fixture described in the embodiment of the present invention is suitable for but not limited to the lighting test of small-sized LCDs; the test fixture is preferably suitable for the test process of the LCD display panel below 3.5 inches.

Compared with the existing LCD test fixture, the test fixture provided in the embodiment of the utility model adopts a modular standardized design, which improves the stability and ease of operation of the auxiliary fixture; reduces the number of assemblies and simplifies the manufacturing steps; Standardization of daily maintenance items and modular installation are adopted to reduce the difficulty and cost of daily maintenance, and enhance the versatility of test fixtures for different types of LCDs.

The above is only a specific embodiment of the present utility model, but the scope of protection of the present utility model is not limited thereto. Any skilled person familiar with the technical field can easily think of changes within the technical scope disclosed by the utility model Or replacement, all should be covered within the scope of protection of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (21)

1. A test fixture, including a base, a carrier, a mounting frame and a signal input module; The base is used to carry the carrier and the signal input module; The carrier is used to carry the liquid crystal display panel to be tested; The signal input module is used to contact the liquid crystal display panel to be tested through a probe and provide a test signal for the liquid crystal display panel to be tested; It is characterized in that guide rails are arranged on the carrier platform, the guide rails are located on two opposite sides of the carrier platform, and the installation frame is slidably arranged on the guide rails. 2. The test fixture according to claim 1, wherein the mounting frame is a polarizer mounting frame. 3. The test fixture according to claim 2, wherein the polarizer mounting frame comprises: a slider that can slide along the guide rail, a polarizer mounting plate for placing the polarizer, and a polarizer mounting plate for adjusting A spacer at a height between the slider and the polarizer mounting plate. 4. The test fixture according to claim 3, wherein the polarizer mounting frame is also provided with a polarizer cover plate, and the polarizer cover plate is adsorbed to the polarizer mounting plate by a magnetic material, Used to fix the polarizer. 5. The test fixture according to claim 4, wherein the magnetic material is a magnet. 6. The test fixture according to claim 3, wherein a push-pull part is provided on one side of the polarizer mounting plate, and the push-pull part is used to push the polarizer mounting frame to slide on the guide rail . 7. The test fixture according to any one of claims 2 to 6, wherein the polarizer mounting frame is an upper polarizer mounting frame. 8 . The test fixture according to claim 1 , wherein the signal input module comprises a probe, a probe base, and a bearing plate that can drive the probe base to move up and down. 9. The test fixture according to claim 8, wherein the probe is a double-ended probe, and one end of the double-ended probe is in contact with the signal transfer circuit board in the signal input module , and the other end is in contact with the liquid crystal display panel to be tested. 10. The test fixture according to claim 8, wherein the probe base is fixed below the bearing plate by a fastener, and the probe base and the bearing plate are correspondingly arranged There are locating pins and locating pin holes. 11 . The test fixture according to claim 10 , wherein an elastic object is further arranged between the probe base and the bearing plate. 12 . 12. The test fixture according to claim 8, wherein a guide hole is provided on the bearing plate, and a flange bearing is provided below the bearing plate and corresponding to the position of the guide hole; The guide hole cooperates with the guide shaft arranged vertically on the base to control the movement direction of the bearing plate; A restoring elastic object is sheathed on the guide shaft, one end of the restoring elastic object is fixed on the base, and the other end is connected with the flange bearing. 13. The test fixture according to claim 12, wherein the number of the guide holes is an even number greater than two. 14. The test fixture according to claim 13, wherein the number of the guide holes is four. 15. The test fixture according to claim 8, wherein the base comprises two parallel side plates, an eccentric mechanism is arranged between the two side plates, and the eccentric mechanism is used to control the The bearing plate moves up and down; A positioning block is arranged on one of the two side plates for positioning the eccentric mechanism. 16. The test fixture according to claim 15, wherein the eccentric mechanism comprises a rotating shaft located between the two side plates and perpendicular to the side plates, and an eccentric shaft connected in series on the rotating shaft Block; the length of the eccentric block in the axial direction of the rotating shaft is 30mm-80mm. 17. The test fixture according to claim 16, wherein the length of the eccentric mass in the axial direction of the rotating shaft is 50 mm. 18. The test fixture according to claim 16 or 17, wherein the eccentric mechanism is provided with an eccentric rolling bearing at the end of the eccentric block away from the rotating shaft, and the eccentric rolling bearing contacts and abuts against the bearing plate superior. 19. The test fixture according to claim 1, wherein the stage includes a main stage and a mobile stage arranged on the main stage, and the mobile stage is used to carry a liquid crystal display to be tested. panel. 20. The test fixture according to claim 19, wherein the mobile stage comprises an X-direction adjustment stage, a Y-direction adjustment stage, and an operation stage; the operation stage is adsorbed on the Adjust the stage in the Y direction. 21. The test fixture according to claim 20, wherein the magnetic material is a magnet.

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