A liquid crystal cell bonding jig

Abstract

This invention provides a liquid crystal cell bonding fixture, comprising a base for support and a mounting groove in the center; a support rod detachably connected to the four corners of the base for guiding and supporting; a placement base plate with a support protrusion at the top, and a liquid crystal cell support plate in the center of the support protrusion, the placement base plate being slidably connected to the mounting groove; a pressure plate slidably connected to the support rod; a lifting screw assembly connected to the pressure plate at the bottom for providing downward pressure; and a support top cover detachably connected to the top of the support rod at the four corners and threadedly connected to the lifting screw assembly in the center. This invention addresses the technical problems of existing bonding fixtures, where manual placement of the pressure block on the liquid crystal cell to be bonded is required. Due to the large size and weight of the copper pressure block, issues such as placement misalignment, hand tremors during placement, damage to the liquid crystal cell by the pressure block, and scratches on the liquid crystal cell surface are common.

Description

Technical Field

[0001] This invention relates to the field of liquid crystal cell bonding technology, and specifically to a liquid crystal cell bonding fixture. Background Technology

[0002] Digital image sources are primarily installed in head-up display (HUD) and helmet-mounted display (HMD) systems. Their function is to project images onto the corresponding optical systems for pilot observation. Due to the unique nature of their optomechanical systems, the distance between the imaging surface of the digital image source and the outer surface of the protective glass (AR surface) requires extreme precision. This distance is determined by the thickness of various components on the LCD screen, including the glass substrate, polarizer, optical adhesive, and filters. These components are bonded together to form the LCD cell of the digital image source. Since the LCD screen is a single unit, the thickness of components such as the polarizer and upper glass substrate cannot be measured individually. Therefore, this distance can be controlled by adjusting the thickness of the adhesive layer on the LCD cell.

[0003] Since the thickness of components such as filters, polarizers, and LCD screens is fixed, the thickness of the LCD cell can only be controlled by adjusting the thickness of the encapsulating optical adhesive, thereby controlling the distance between the imaging surface and the AR surface. Currently, the bonding fixtures used in LCD cell manufacturing are spacers of specific thicknesses. Depending on the required LCD cell thickness and the thicknesses of components such as filters and LCD screens, a spacer of appropriate thickness is selected and placed between the filter and LCD screen to form a cavity. Optical adhesive is then filled into the cavity, and the LCD cell is compressed using a pressure block. The degree of compression is limited by a mold to control the thickness of the optical adhesive, and thus the LCD cell thickness. Because sufficient pressure is required to compress the LCD cell, and this pressure is provided by the weight of the pressure block, the pressure block must be sufficiently heavy. Copper is typically used for the pressure block, and its weight is generally over 1 kg, making it quite bulky. If different compression forces are required, pressure blocks of different weights must be used. This results in a large variety of pressure blocks, high costs, and inconvenience in use and management. The process that has the greatest impact on the bonding quality of LCD cells is the pressing of the LCD cell by the clamping block. Existing bonding fixtures rely on manual placement of the clamping block onto the LCD cell to be bonded. Because the copper clamping block is large and heavy, it is prone to problems such as placement misalignment, hand tremors during placement, damage to the LCD cell by the clamping block, and scratches on the LCD cell surface, resulting in a low bonding pass rate. After the LCD cell is filled with optical adhesive, it needs to be moved to an oven for heating and curing while still under the pressure of the clamping block. The heavy clamping block is inconvenient to move. The clamping block cannot be fixed firmly, and shaking during movement also increases thickness error and reduces the pass rate. Therefore, existing bonding fixtures are insufficient to meet the bonding requirements.

[0004] It should be noted that the above content falls within the scope of the inventor's technical knowledge. Due to the vast and complex nature of the technical content in this field, the above content of this application does not necessarily constitute prior art. Summary of the Invention

[0005] 1. The technical problem that the invention aims to solve

[0006] The present invention provides a liquid crystal cell bonding fixture to solve the technical problems existing in the background art.

[0007] 2. Technical Solution

[0008] To achieve the above objectives, the technical solution provided by the present invention is: a liquid crystal cell bonding fixture, comprising...

[0009] The base provides support and has a mounting groove in the middle.

[0010] The support rod is detachably connected to the four corners of the base at its bottom, serving as a guide and support.

[0011] The storage base plate has a support protrusion at the top, and a liquid crystal cell support plate is provided in the middle of the support protrusion. The storage base plate is slidably connected to the mounting groove.

[0012] A pressure plate, which is slidably connected to the support rod;

[0013] The lifting screw assembly, connected to the pressure plate at the bottom, can provide downward pressure on the pressure plate;

[0014] The top cover is detachably connected to the top of the support rod at the four corners, and the lifting screw assembly is threadedly connected to the middle.

[0015] This device uses extrusion to create a precisely dimensional space in the thickness direction of the liquid crystal cell to control its overall thickness. The axial force generated by the rotation of the lifting screw assembly provides the extrusion force, and the rotating screw ensures the pressure plate stably presses the liquid crystal cell. Simultaneously, the self-locking characteristic of the lifting screw assembly prevents the pressure block from wobbling. The working process is as follows: First, a type of adhesive with a certain degree of elasticity is coated on three sides of the substrate glass on the liquid crystal screen to act as a support. Then, the filter is attached for pre-bonding. The initial thickness of the pre-bonded liquid crystal cell is slightly larger than the required thickness. The pre-bonded liquid crystal cell is placed on the liquid crystal cell support plate of the placement base. Optical adhesive is filled into the center of the liquid crystal cell using a syringe. The lifting screw assembly is rotated, and the pressure plate is pressed down vertically and uniformly under the action of the threaded rod until the touch screen touches the liquid crystal cell. The pressure continues until the internal optical adhesive overflows until the pressure plate contacts the pressure plate support protrusion. Finally, the bonding fixture clamping the liquid crystal cell is placed in an oven for heating and curing of the optical adhesive, completing the bonding of the liquid crystal cell. This device allows for the selection of a suitable placement base plate according to different liquid crystal cell thicknesses.

[0016] Furthermore, an adhesive groove is provided on one side of the base, and the adhesive groove is connected to the mounting groove.

[0017] Furthermore, the lifting screw assembly includes a rotating handle, a threaded rod detachably connected to the bottom of the rotating handle, a bushing threadedly connected to the threaded rod, the bushing detachably connected to the middle of the support top cover, a ball joint detachably connected to the bottom of the threaded rod, and a concave cover plate connected to the top of the pressure plate that matches the ball joint.

[0018] Furthermore, the top of the threaded rod is provided with a ratchet, and the two ends of the rotating handle are provided with first threaded grooves. A limiting screw is connected in the first threaded groove, and an elastic element is provided inside the limiting screw. The elastic element is connected to a push pin, and the push pin abuts against the ratchet.

[0019] Furthermore, the tail end of the limiting screw is provided with a rotating groove.

[0020] Furthermore, the ball joint is detachably connected to the bottom of the threaded rod via an R-pin.

[0021] 3. Beneficial effects

[0022] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0023] 1. High bonding pass rate: The screw rod rotates to drive the pressure plate to press down, avoiding damage or scratches to the LCD cell caused by the pressure block, and avoiding the adverse effects of tilting or shaking caused by manually placing the pressure block; the clamp has a self-locking function to avoid adverse effects such as shaking during bonding and transportation.

[0024] 2. High adaptability and stable bonding quality: It is not affected by the dimensional tolerances of parts such as filters and LCD screens.

[0025] 3. Adjustable extrusion pressure: The extrusion pressure of the pressure plate can be adjusted by the limit screw to meet the bonding requirements of different extrusion pressures.

[0026] 4. Good versatility: By changing the base plate, it can be used for bonding digital image source LCD cells of other sizes.

[0027] It should be noted that the structures not described in this invention are not related to the design points and improvement directions of this invention, and are the same as or can be implemented using existing technologies, so they will not be elaborated here. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention;

[0029] Figure 2 This is a partial structural diagram of the present invention;

[0030] Figure 3 This is a schematic diagram of the lifting screw assembly structure of the present invention.

[0031] Figure Labels

[0032] 1. Base; 11. Glue tank; 2. Mounting slot; 3. Support rod; 4. Storage base plate; 5. Pressure plate; 6. Lifting screw assembly; 61. Rotating handle; 62. Threaded rod; 621. Ratchet; 622. First threaded groove; 623. Limit screw; 624. Elastic element; 625. Ejector pin; 626. R-pin; 63. Bushing; 64. Ball joint; 65. Concave cover plate; 7. Support top cover; 8. Support protrusion; 9. LCD cell support plate. Detailed Implementation

[0033] To facilitate understanding of the present invention, a more complete description of the invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the invention will be more thorough and complete.

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "page," "bottom," "inner," "outer," "clockwise," and "counterclockwise," 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.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "fixed," "provided with," and "located in" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Example

[0037] See attached document Figure 1-3A liquid crystal cell bonding fixture, comprising

[0038] The base 1 provides support and has a mounting groove 2 in the middle.

[0039] Support rod 3 is detachably connected to the four corners of the base 1 at the bottom, serving as a guide and support;

[0040] The storage base plate 4 has a support protrusion 8 on the top, and a liquid crystal cell support plate 9 is provided in the middle of the support protrusion 8. The storage base plate 4 is slidably connected to the mounting groove 2.

[0041] Pressure plate 5, which is slidably connected to support rod 3;

[0042] The lifting screw assembly 6 is connected to the pressure plate 5 at the bottom and can provide downward pressure to the pressure plate 5;

[0043] The top cover 7 is detachably connected to the top of the support rod 3 at the four corners, and the lifting screw assembly 6 is threadedly connected to the middle.

[0044] This device controls the overall thickness of the liquid crystal cell by forming a precisely dimensional space in the thickness direction of the cell through extrusion. The axial force generated by the rotation of the lifting screw assembly 6 provides the extrusion force, and the rotating screw ensures that the pressure plate 5 stably extrudes the liquid crystal cell. Simultaneously, the self-locking characteristic of the lifting screw assembly 6 prevents the pressure block from wobbling. The working process of this device is as follows: First, a type of adhesive with a certain degree of elasticity is coated on three sides of the substrate glass on the liquid crystal screen to act as a support. Then, the filter is attached for pre-bonding. The initial thickness of the pre-bonded liquid crystal cell is slightly greater than the required thickness. The process involves placing the pre-bonded LCD cell on the LCD cell support plate 9 of the base plate 4, filling the center of the LCD cell with optical adhesive using a syringe, rotating the lifting screw assembly 6, and pressing the pressure plate 5 vertically and uniformly under the action of the threaded rod 62 until the touch screen touches the LCD cell. The pressure continues to be applied until the internal optical adhesive overflows and the pressure plate 5 contacts the pressure plate 5 support protrusion 8. Then, the bonding fixture that clamps the LCD cell is placed in an oven for heating to cure the optical adhesive, thus completing the bonding of the LCD cell. This device can select a suitable base plate 4 according to different LCD cell thicknesses.

[0045] The base 1 has an adhesive groove 11 on one side, which is connected to the mounting groove 2. The adhesive groove 11 corresponds to the side of the substrate glass on the LCD screen that is not coated with adhesive. When the pressure plate 5 is pressed down, excess optical adhesive overflows and flows into the adhesive groove 11. The function of the adhesive groove 11 is to collect the overflowing adhesive for easy cleaning later.

[0046] The lifting screw assembly 6 includes a rotating handle 61, with a threaded rod 62 detachably connected to the bottom of the rotating handle 61. The threaded rod 62 is threadedly connected to a bushing 63, which is detachably connected to the middle of the support top cover 7. A ball joint 64 is detachably connected to the bottom of the threaded rod 62. A concave cover plate 65 is connected to the top of the pressure plate 5 and matches the ball joint 64. The lifting screw assembly 6 can move up and down by rotating within the bushing 63 in the middle of the support top cover 7. Due to the tolerances in the machining of the parts, it is impossible to guarantee that the pressure plate 5 and the pressure plate 5 support protrusion 8 are absolutely parallel, nor can it be guaranteed that the four pressure plate 5 support protrusions 8 are completely without height difference. Therefore, the pressure plate 5 is connected to the screw through a ball joint and can rotate around the center of the ball joint 64, further improving the accuracy of the device. The threaded rod 62 connected to the pressure plate 5 has a self-locking function, and tightening it can ensure the firmness of the clamping.

[0047] The top of the threaded rod 62 is provided with a ratchet 621. The rotating handle 61 has first threaded grooves 622 at both ends. A limiting screw 623 is connected in the first threaded groove 622. An elastic element 624 is provided inside the limiting screw 623. The elastic element 624 is connected to a push pin 625. The push pin 625 abuts against the ratchet 621. The elastic element 624 can be a spring. When the spring is in a compressed state, it pushes the push pin 625 to contact the ratchet 621. When rotated clockwise, the handle drives the screw to rotate clockwise through the cooperation between the push pin 625 and the ratchet 621. The pressure plate 5 moves downward. When the pressure plate 5 contacts the bottom plate and squeezes... To a certain extent, the screw cannot rotate. When the handle 61 is rotated further, the spring can be compressed, and the ejector pin 625 is lifted by the serrations on the ratchet 621. After rotating 45°, the ejector pin 625 jumps over the serrations. This process is repeated, and the handle slips. At this time, the pressure plate 5 is already pressed. When rotating counterclockwise, the ejector pin 625 will be stuck with the serrations, so the handle will not slip and can drive the screw to rotate counterclockwise. The pressure plate 5 moves upward, and at this time the pressure plate 5 is released. When the pressure plate 5 contacts the pressure plate 5 support protrusion 8 and is parallel, it is pressed. Continuing to rotate the handle 61 will cause slippage, preventing the pressure plate 5 from bending due to only the force in the middle during the pressing process.

[0048] The limiting screw 623 has a rotating groove at its tail end. The rotating groove can be in the shape of a straight line, a star shape, or a star shape. The position of the screw can be adjusted by rotating the handle, thereby adjusting the pressure of the pressure plate 5. When the limiting screw 623 is turned clockwise with a matching screwdriver, the screw moves towards the center, the spring preload increases, and the force required for the ejector pin 625 to jump over the saw teeth is greater. That is, the torque transmitted from the handle to the screw is greater, and the pressure of the pressure plate 5 on the base plate is also greater when tightened. Similarly, when the limiting screw 623 is turned counterclockwise, the screw moves outward, the spring preload decreases, and the force required for the ejector pin 625 to jump over the saw teeth is less. That is, the torque transmitted from the handle to the screw is less, and the pressure of the pressure plate 5 on the base plate is also less when tightened. Different lengths of limiting screws 623 and springs can also be selected according to actual conditions.

[0049] The ball joint 64 is detachably connected to the bottom of the threaded rod 62 via an R-shaped pin 626, which facilitates the replacement and maintenance of the ball joint 64.

[0050] The above-described embodiments are merely illustrative of certain implementations of the present invention, and are described in a relatively specific and detailed manner. However, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements are all within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A liquid crystal cell bonding fixture, characterized by: include The base (1) provides support and has a mounting groove (2) in the middle. The support rod (3) is detachably connected to the four corners of the base (1) at the bottom, serving as a guide and support; The storage base plate (4) has a support protrusion (8) on the top, and a liquid crystal cell support plate (9) is provided in the middle of the support protrusion (8). The storage base plate (4) is slidably connected to the mounting groove (2). Pressure plate (5), the pressure plate (5) is slidably connected to the support rod (3); The lifting screw assembly (6) is connected to the pressure plate (5) at the bottom and can provide downward pressure to the pressure plate (5); The top cover (7) is detachably connected to the top of the support rod (3) at the four corners, and the lifting screw assembly (6) is threadedly connected to the middle part. The lifting screw assembly (6) includes a rotating handle (61), the bottom of which is detachably connected to a threaded rod (62), the threaded rod (62) is threadedly connected to a bushing (63), the bushing (63) is detachably connected to the middle of the support top cover (7), the bottom of which is detachably connected to a ball joint (64), and the top of the pressure plate (5) is connected to a concave cover plate (65) that matches the ball joint (64). The top of the threaded rod (62) is provided with a ratchet (621), and the two ends of the rotating handle (61) are provided with first threaded grooves (622). The first threaded grooves (622) are connected to a limiting screw (623). The limiting screw (623) is provided with an elastic element (624). The elastic element (624) is connected to a push pin (625). The push pin (625) abuts against the ratchet (621).

2. A liquid crystal cell bonding fixture according to claim 1, wherein: The base (1) has an adhesive groove (11) on one side, and the adhesive groove (11) is connected to the mounting groove (2).

3. A liquid crystal cell bonding fixture according to claim 1, wherein: The tail end of the limiting screw (623) is provided with a rotating groove.

4. A liquid crystal cell bonding fixture according to claim 1, wherein: The ball joint (64) is detachably connected to the bottom of the threaded rod (62) via an R-pin (626).

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