Light guide plate reinforcing assembly

Abstract

The invention discloses a light guide plate reinforcing assembly, and solves the problems that a device can only fix a light guide plate in a high-temperature state and cannot effectively solve the problems that in a low-temperature environment, due to the fact that the light guide plate (generally made of PMMA or PC materials) has a positive thermal expansion coefficient, the light guide plate can be subjected to cold contraction, and consequently pre-tightening force is lost and connection is loose. Under the condition of shaking, a gap is generated between the light guide plate and the LED light source due to loosening, so that the light coupling efficiency is reduced, and a dark area appears on the edge of the screen; meanwhile, the loosened light guide plate can generate abnormal sound, and even is damaged in small collision with a metal piece. Therefore, the light guide plate reinforcing assembly can provide continuous, stable and reliable constraint for the light guide plate in a full temperature range (especially high and low temperature alternation) and under a vibration condition.

Description

Technical Field

[0001] This invention relates to the field of light guide plates, and more specifically, to a light guide plate reinforcement assembly. Background Technology

[0002] With the development of science and technology, liquid crystal display (LCD) technology has become increasingly mature, and LCD modules are widely used in fields such as communication electronics, consumer electronics, automotive electronics, and aerospace. LCD modules operate under complex conditions, requiring compliance with high and low temperatures, vibration, and other environmental requirements. Therefore, the reinforcement method of the optical light guide plate is crucial for the LCD module to meet these complex operating conditions.

[0003] Chinese Patent No. CN102879856B discloses a light guide plate and its assembly for an airborne liquid crystal display. The metal structural component has two receiving grooves with shapes consistent with the shapes of two ear pieces. The light guide plate is engaged in the metal structural component, and each ear piece is received in the corresponding receiving groove. Except for each inclined surface and groove being in close contact, there are gaps between the light guide plate and the metal structural component.

[0004] The applicant discovered the following technical problems when implementing the above-mentioned technical solution: This device can only fix the light guide plate at high temperatures. It cannot effectively solve the problem of loss of preload and loosening of the connection in low-temperature environments due to the positive thermal expansion coefficient of the light guide plate (usually made of PMMA or PC material). Under shaking conditions, this loosening will create gaps between the light guide plate and the LED light source, resulting in reduced light coupling efficiency and dark areas at the edges of the screen. At the same time, the loose light guide plate will produce abnormal noises and may even break in minor collisions with metal parts.

[0005] Therefore, providing a light guide plate reinforcement component that can provide continuous, stable, and reliable constraint for the light guide plate across the entire temperature range (especially under alternating high and low temperatures) and vibration conditions is a problem that this invention urgently needs to solve. Summary of the Invention

[0006] To address the aforementioned technical problems, the purpose of this invention is to overcome the fact that the current device can only fix the light guide plate at high temperatures. It cannot effectively solve the problem of loss of pre-tightening force and loosening of the connection in low-temperature environments due to the positive thermal expansion coefficient of the light guide plate (usually made of PMMA or PC material), which causes contraction. Under shaking conditions, this loosening can create gaps between the light guide plate and the LED light source, resulting in reduced light coupling efficiency and dark areas at the screen edges. Simultaneously, a loose light guide plate can produce abnormal noises and even break in minor collisions with metal components. Therefore, this invention provides a light guide plate reinforcement component that can provide continuous, stable, and reliable constraint for the light guide plate across the entire temperature range (especially under alternating high and low temperatures) and vibration conditions.

[0007] To achieve the above objectives, the present invention provides a light guide plate reinforcement assembly, comprising: a screen frame, wherein a plurality of slots and mounting grooves are spaced apart on the periphery of the screen frame; an optical light guide plate, wherein a plurality of fixing ears corresponding one-to-one with each slot are spaced apart on the periphery of the optical light guide plate; a slider and a first elastic element, wherein the slider is reciprocally extended and retracted in the mounting groove toward the side wall of the optical light guide plate by means of the first elastic element.

[0008] Preferably, except for the two inclined walls of the fixing ear that are in contact with the inclined wall inside the slot, the other side walls of the optical light guide plate have gaps between them and the inner wall of the screen frame.

[0009] Preferably, the slider is provided with limit grooves on both sides, and the mounting groove is provided with limit rails corresponding to each limit groove.

[0010] Preferably, a pressure block is provided on the side of the mounting groove away from the slider, a telescopic rod is provided on the pressure block along the moving direction of the slider, and a telescopic groove is provided on the side of the slider near the pressure block, coaxial with the telescopic rod.

[0011] Preferably, the mounting groove is further provided with a constant force component to ensure that the slider applies a constant force to the sidewall of the optical light guide plate; wherein, the constant force component includes: a fixed cylinder, wherein a plurality of fixed cylinders are spaced apart on the side of the pressure block near the slider; a telescopic cover, wherein the telescopic cover is adapted to the fixed cylinder and is coaxially and reciprocally disposed in the fixed cylinder in the direction of slider movement, wherein one end of the first elastic element is fixed to the telescopic cover and the other end is fixed to the slider; and a negative thermal expansion coefficient mixture, wherein the space between the inner side of the telescopic cover and the inner cavity of the fixed cylinder is filled with a negative thermal expansion coefficient mixture.

[0012] Preferably, the negative thermal expansion coefficient mixture is a mixture of materials with negative thermal expansion coefficients and materials with low thermal expansion coefficients.

[0013] Preferably, a first guide rod is horizontally arranged on the outer side of the telescopic cover facing the direction of slider movement, and a second guide rod is arranged on the side of the slider near the pressure block in a one-to-one correspondence with each of the first guide rods. The two ends of the first elastic member are respectively sleeved on the first guide rod and the second guide rod.

[0014] Preferably, a plurality of third guide rods are coaxially arranged around the telescopic cover inside the fixed cylinder, and a stop block is also arranged around its opening to prevent the telescopic cover from detaching. A second elastic element is sleeved on the third guide rod, one end of the second elastic element abutting or fixed to the outside of the telescopic cover, and the other end abutting or fixed to the inside of the stop block.

[0015] According to the above technical solution, the beneficial effects of the present invention compared with the prior art are as follows: The present application realizes the installation of the optical light guide plate by inserting the fixing ear into the corresponding slot and compressing the first elastic element by the slider; Under high temperature conditions, the side of the optical light guide plate will expand, and the negative thermal expansion coefficient mixture will contract. At this time, the first elastic element pushes the telescopic cover to the side of the contracted negative thermal expansion coefficient mixture, and the side of the optical light guide plate pushes the slider to move a certain distance. Since the distance the slider moves is almost the same as the distance the telescopic cover moves, the elastic force applied by the first elastic element to the slider is also almost unchanged, thereby avoiding damage to the optical light guide plate by the slider; At low temperatures, the sides of the optical light guide plate will shrink, while the mixture with a negative coefficient of thermal expansion will expand. At this time, the telescopic cover will push the slider to one side of the optical light guide plate through the first elastic element to clamp it. Since the distance the slider moves is almost the same as the distance the telescopic cover moves, the elastic force applied by the first elastic element to the slider is also almost unchanged, thereby preventing the optical light guide plate from loosening. This application selects materials with a positive coefficient of thermal expansion similar to that of the optical light guide plate and mixes them with materials with a low coefficient of thermal expansion in a certain proportion to form a mixture with a negative coefficient of thermal expansion, so as to ensure that the distance the slider moves is almost the same as the distance the telescopic cover moves, thereby providing a continuous, stable and reliable constraint force for the light guide plate.

[0016] Other features and advantages of the present invention will be described in detail in the following detailed description section; and all parts not covered in the present invention are the same as or can be implemented using the prior art. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a perspective view of a light guide plate reinforcement assembly provided in a preferred embodiment of the present invention; Figure 2 This is a cross-sectional view of a light guide plate reinforcement assembly provided in a preferred embodiment of the present invention; Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 This is a partial perspective view of a light guide plate reinforcement assembly provided in a preferred embodiment of the present invention; Figure 5 yes Figure 4 Exploded view; Figure 6 yes Figure 4 Cross-sectional view at the dashed line.

[0018] Explanation of reference numerals in the attached drawings: 1. Screen frame; 11. Slot; 12. Mounting slot; 13. Limiting slide rail; 2. Optical light guide plate; 21. Fixing ear; 3. Slider; 31. Telescopic groove; 32. Limiting slide groove; 33. Second guide rod; 4. First elastic element; 5. Pressure block; 51. Telescopic rod; 6. Constant force component; 61. Fixing cylinder; 611. Third guide rod; 612. Stop block; 613. Second elastic element; 62. Telescopic cover; 621. First guide rod; 63. Negative thermal expansion coefficient mixture. Detailed Implementation

[0019] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0020] In the description of the embodiments of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These are merely for the convenience of describing the 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 the invention. Furthermore, the terms "first," "second," and "third," etc., are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance. Additionally, the terms "horizontal," "vertical," and "suspended," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0021] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 the present invention according to the specific circumstances.

[0022] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0023] Reference Figures 1-3A light guide plate reinforcement assembly includes: a screen frame 1, wherein a plurality of slots 11 and mounting slots 12 are spaced apart around the screen frame 1; an optical light guide plate 2, wherein a plurality of fixing ears 21 corresponding one-to-one with each slot 11 are spaced apart around the optical light guide plate 2; a slider 3 and a first elastic element 4, wherein the slider 3 is reciprocally extended and retracted in the mounting slot 12 toward the side wall of the optical light guide plate 2 by means of the first elastic element 4.

[0024] This application perfectly solves the problems of high-temperature expansion and low-temperature contraction simultaneously through the extension and retraction of springs. It achieves continuous, adaptive, and flexible clamping of the light guide plate across the entire operating temperature range, from low to high. Because the light guide plate is always stably fixed, its relative position to the LED light source will not change due to temperature variations or vibrations. This ensures stable light coupling efficiency, avoids optical defects such as dark edges, flickering, or uneven brightness on the screen, and improves the reliability of display quality. The first elastic element 4 is made of a material with a low coefficient of thermal expansion, such as the low coefficient of thermal expansion alloy Invar.

[0025] Reference Figure 1 and Figure 2 Except for the fixing ears 21, which are in contact with the inner inclined wall of the slot 11, the other side walls of the optical light guide plate 2 have gaps between them and the inner wall of the screen frame 1.

[0026] The planar positioning of the light guide plate within the screen frame 1 is ensured solely by the mating surfaces of a few specific, dispersed "fixed ears 21" and "slots 11". These contact points are rigid, ensuring the positional accuracy of the light guide plate in the XY plane, preventing its overall movement, and ensuring consistent gap distance between the remaining sidewalls of the optical light guide plate 2 and the inner wall of the screen frame 1.

[0027] Reference Figure 3 and Figure 4 The slider 3 is provided with limiting grooves 32 on both sides, and the mounting groove 12 is provided with limiting rails 13 corresponding to each limiting groove 32.

[0028] The slider 3 of this application is mounted in the limiting slide rail 13 and can reciprocate toward the side wall of the optical light guide plate 2 via the limiting slide groove 32, ensuring that no deviation occurs.

[0029] Reference Figures 3-5 The mounting groove 12 is provided with a pressure block 5 on the side away from the slider 3. A telescopic rod 51 is provided on the pressure block 5 along the moving direction of the slider 3. A telescopic groove 31 is provided on the side of the slider 3 near the pressure block 5 and coaxially with the telescopic rod 51.

[0030] The slider 3 of this application is further guaranteed not to deviate during movement by the cooperation of the telescopic rod 51 and the telescopic groove 31, and the telescopic rod 51 is fixedly set in the telescopic groove 31, which also prevents the slider 3 from detaching.

[0031] Reference Figures 4-6 The mounting groove 12 is also provided with a constant force component 6 to ensure that the slider 3 applies a constant force to the side wall of the optical light guide plate 2; wherein, the constant force component 6 includes: a fixed cylinder 61, wherein a plurality of fixed cylinders 61 are spaced apart on the side of the pressure block 5 near the slider 3; a telescopic cover 62, wherein the telescopic cover 62 is adapted to the fixed cylinder 61 and is coaxially and reciprocally disposed in the fixed cylinder 61 in the direction of movement of the slider 3, wherein one end of the first elastic element 4 is fixed on the telescopic cover 62 and the other end is fixed on the slider 3; and a negative thermal expansion coefficient mixture 63, wherein the inner side of the telescopic cover 62 and the inner cavity of the fixed cylinder 61 are filled with a negative thermal expansion coefficient mixture 63.

[0032] Because the first elastic element 4 is made of an alloy with a low coefficient of thermal expansion, its length is almost unaffected by temperature. At high temperatures, the mixture 63 with a negative coefficient of thermal expansion will contract to a certain extent, causing the first elastic element 4 to compress the telescopic cover 62 and move. At the same time, the optical light guide plate 2 will expand to a certain extent, correspondingly offsetting the movement distance of the compression cover, thereby ensuring that the elastic force of the first elastic element 4 is basically constant and the slider 3 will not damage the optical light guide plate 2. At low temperatures, the mixture 63 with a negative coefficient of thermal expansion will expand to a certain extent, causing the telescopic cover 62 to move and compress the first elastic element 4. At the same time, the optical light guide plate 2 will contract to a certain extent, correspondingly offsetting the movement distance of the compression cover, thereby ensuring that the elastic force of the first elastic element 4 is basically constant and the optical light guide plate 2 will not loosen.

[0033] The negative thermal expansion coefficient mixture 63 is specifically a mixture of materials with negative thermal expansion coefficients and materials with low thermal expansion coefficients.

[0034] This application adjusts the ratio of low thermal expansion coefficient material particles and negative thermal expansion coefficient material to ensure that the expansion or contraction distance of the telescopic cover 62 is basically consistent with the expansion and contraction distance of the optical light guide plate 2 under high and low temperature conditions. This ensures that the first elastic element 4 hardly deforms, thus ensuring that the fixing force of the slider 3 on the side wall of the optical light guide plate 2 remains almost unchanged and can always provide a stable clamping force. It will not cause the clamping force to weaken when the optical light guide plate 2 contracts at low temperatures, or cause the clamping force to be too large when the optical light guide plate 2 expands at high temperatures, thus preventing damage to internal parts. The low thermal expansion coefficient material particles can be low thermal expansion alloys, microcrystalline glass, etc., and the negative thermal expansion coefficient material can be anti-perovskite manganese nitrogen mixed compound particles, etc., which are similar to the absolute value of the positive thermal expansion coefficient range of the optical light guide plate 2.

[0035] Reference Figure 5 The telescopic cover 62 has a first guide rod 621 horizontally arranged on the outer side facing the moving direction of the slider 3. The slider 3 is provided with a second guide rod 33 corresponding to each first guide rod 621 on the side near the pressure block 5. The first elastic member 4 is sleeved on the first guide rod 621 and the second guide rod 33 at opposite ends.

[0036] The guide rod of this application prevents the spring from bending laterally, prevents irregular lateral swaying, effectively prevents premature fatigue failure of the spring, extends the mechanical life of the entire reinforcement assembly, and also ensures a constant and effective clamping force.

[0037] Reference Figure 5 and Figure 6 The fixed cylinder 61 is provided with several third guide rods 611 that are coaxially arranged around the telescopic cover 62, and a stop block 612 is also arranged around its opening to prevent the telescopic cover 62 from falling off. A second elastic element 613 is sleeved on the third guide rod 611. One end of the second elastic element 613 abuts or is fixed to the outside of the telescopic cover 62, and the other end abuts or is fixed to the inside of the stop block 612.

[0038] The telescopic cover 62 of this application moves smoothly along the third guide rod 611 under the push / pull of the negative thermal expansion mixture. The second elastic element 613 assists the first elastic element 4 in resetting the telescopic cover 62. The second elastic element 613 is selected from springs with large damping or used in conjunction with dampers to absorb and buffer vibrations.

[0039] In use, the device provided by this invention installs the optical light guide plate 2 by inserting the fixing ear 21 into the corresponding slot 11, while simultaneously compressing the first elastic element 4 via the slider 3. At high temperatures, the side of the optical light guide plate 2 expands while the negative thermal expansion coefficient mixture 63 contracts. At this time, the first elastic element 4 pushes the telescopic cover 62 to the side of the contracted negative thermal expansion coefficient mixture 63, and the side of the optical light guide plate 2 pushes the slider 3 to move a certain distance. Since the distance the slider 3 moves is almost the same as the distance the telescopic cover 62 moves, the elastic force applied by the first elastic element 4 to the slider 3 remains almost unchanged, thus preventing damage to the optical light guide plate 2 by the slider 3. At low temperatures, the optical light guide plate 2... The side of the light guide plate 2 will contract, while the negative thermal expansion coefficient mixture 63 will expand. At this time, the telescopic cover 62 will push the slider 3 to one side of the optical light guide plate 2 through the first elastic element 4 to clamp it. Since the distance the slider 3 moves is almost the same as the distance the telescopic cover 62 moves, the elastic force applied by the first elastic element 4 to the slider 3 is also almost unchanged, thereby preventing the optical light guide plate 2 from loosening. This application selects a material with a negative thermal expansion coefficient that is close to the absolute value of the positive thermal expansion coefficient of the optical light guide plate 2 and mixes it with a material with a low thermal expansion coefficient in a certain proportion to form a negative thermal expansion coefficient mixture 63, so as to ensure that the distance the slider 3 moves is almost the same as the distance the telescopic cover 62 moves, thereby providing a continuous, stable and reliable constraint force for the light guide plate.

[0040] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0041] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0042] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A light guide plate reinforcement assembly, characterized in that, Include: Screen frame (1), the screen frame (1) is provided with a plurality of clamping slots (11) and mounting slots (12) on the side; Optical light guide plate (2), the optical light guide plate (2) is provided with a plurality of fixed ears (21) corresponding to each clamping slot (11) on the side; Sliding block (3) and first elastic member (4), the sliding block (3) is provided in the mounting slot (12) by the first elastic member (4) and can be reciprocatingly arranged on the side wall of the optical light guide plate (2).

2. The light guide plate reinforcing assembly according to claim 1, wherein The optical light guide plate (2) has a gap between the remaining side wall and the inner wall of the screen frame (1) except that the opposite two inclined walls of the fixed ear (21) are in contact with the inner inclined wall of the clamping slot (11).

3. The light guide plate reinforcing assembly of claim 1, wherein, The sliding block (3) is provided with a limiting sliding groove (32) on the opposite side, and the mounting slot (12) is provided with a limiting sliding rail (13) corresponding to each limiting sliding groove (32).

4. The light guide plate reinforcing assembly of claim 3, wherein, The mounting slot (12) is provided with a pressing block (5) away from the sliding block (3), the pressing block (5) is provided with a telescopic rod (51) along the moving direction of the sliding block (3), and the sliding block (3) is coaxially provided with a telescopic slot (31) on the side close to the pressing block (5).

5. The LGP reinforcement assembly of claim 4, wherein, The mounting slot (12) is further provided with a constant force assembly (6) for ensuring that the sliding block (3) applies a constant force to the side wall of the optical light guide plate (2); wherein the constant force assembly (6) comprises: a plurality of fixed cylinders (61) are arranged on the side close to the sliding block (3) of the pressing block (5); Telescopic cover (62), the telescopic cover (62) is matched with the fixed cylinder (61), and is coaxially movably arranged in the fixed cylinder (61) along the moving direction of the sliding block (3), one end of the first elastic member (4) is fixed on the telescopic cover (62), and the other end is fixed on the sliding block (3); Negative thermal expansion coefficient mixture (63), the inside of the telescopic cover (62) and the inner cavity of the fixed cylinder (61) are filled with negative thermal expansion coefficient mixture (63).

6. The light guide plate reinforcing assembly of claim 5, wherein, The negative thermal expansion coefficient mixture (63) is a mixture of negative thermal expansion coefficient material and low thermal expansion coefficient material.

7. The light guide plate reinforcing assembly of claim 5, wherein, The outer side of the telescopic cover (62) is provided with a first guide rod (621) horizontally towards the moving direction of the sliding block (3), and the sliding block (3) is provided with a second guide rod (33) corresponding to each first guide rod (621) on the side close to the pressing block (5), and the first elastic member (4) is respectively sleeved on the first guide rod (621) and the second guide rod (33).

8. The light guide plate reinforcing assembly of claim 5, wherein, A plurality of third guide rods (611) are coaxially arranged in the fixed cylinder (61) and pass through the telescopic cover (62), and a stop block (612) is further arranged around the opening of the fixed cylinder (61) to prevent the telescopic cover (62) from being separated, a second elastic member (613) is sleeved on the third guide rod (611), one end of the second elastic member (613) abuts or is fixed on the outer side of the telescopic cover (62), and the other end abuts or is fixed on the inner side of the stop block (612).

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