Ultra-narrow frame bending light guide plate and manufacturing method thereof

Abstract

The invention relates to the technical field of light guide plates, in particular to a bent light guide plate with an ultra-narrow frame, which adopts a light guide plate piece and a shading film, the light guide plate piece comprises a light guide emergent part, a bent light guide part and a light guide incident part, and the shading film is attached to the outer surface of the light guide incident part, the outer surface of the bent light guide part and the side edge of the outer surface of the light guide emergent part. The bottom face of the light guide and incidence part is used for receiving light of the light-emitting light source. According to the bent light guide plate with the ultra-narrow frame, the bent light guide part is used for refracting light from the light guide incident part to the light guide emergent part for emitting light, and the shading film is used for shading the side edges of the outer surface of the light guide incident part, the outer surface of the bent light guide part and the outer surface of the light guide emergent part, so that the light efficiency utilization rate is improved; and the light guide and incidence part, the bent light guide part and the shading film are matched together to prevent a front explosion point of the lamp from being directly observed, so that the problem that the whole space structure is limited, particularly the problem that the structure in the width direction is limited, is solved, and the requirement of whole-surface light emitting of a deco area of an electronic product is met.

Description

Technical Field

[0001] This invention relates to the field of light guide plate technology, specifically to an ultra-narrow bezel bent light guide plate and its manufacturing method. Background Technology

[0002] Traditional light guide plates are typically flat, with light sources (such as GRB lamps) installed on their four sides. Light enters the light guide plate directly through its four sides, requiring a large space. Moreover, the light guide plate has obvious light spot in front of the lamp, and the lamp eye is not visible until it is at least 5mm away from the light-emitting area. Therefore, sufficient shielding distance is required, and a certain distance is needed between the light guide plate and the light source to reduce the light spot in front of the lamp. This results in poor light uniformity and low overall brightness of the light guide plate, which is not conducive to energy saving.

[0003] If you want the entire deco area of ​​an electronic product to be illuminated, such as the entire deco area of ​​a mobile phone back cover, and you also need to meet the requirement that the sides of the electronic product need to be covered with waterproof adhesive, then traditional planar light guide plates are limited in their overall spatial structure, especially in the width direction, because the side light source will inevitably occupy a certain amount of space, and the shielding distance and setting spacing required for the light burst point are also limited. Therefore, it is impossible to meet the requirement of the entire deco area of ​​electronic products being illuminated. Summary of the Invention

[0004] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this invention is to provide an ultra-narrow bezel bent light guide plate.

[0005] Another objective of this invention is to provide a method for preparing an ultra-narrow bezel bent light guide plate. This method is simple to operate, easy to control, has high production efficiency, low production cost, and can be used for large-scale production.

[0006] The objective of this invention is achieved through the following technical solution: an ultra-narrow bezel bent light guide plate, comprising a light guide plate and a light shielding film, wherein the light guide plate comprises a light emitting portion, a bent light guide portion extending to the side of the light emitting portion, and a light receiving portion extending to the bottom surface of the bent light guide portion, wherein the light shielding film is attached to the outer surface of the light receiving portion, the outer surface of the bent light guide portion, and the outer surface edge of the light emitting portion, and the bottom surface of the light receiving portion is used to receive light from a light source; The bent light guide section is rounded at the corners, and the outer rounded corner radius of the bent light guide section is more than twice the inner rounded corner radius of the bent light guide section; the center rounded corner radius of the bent light guide section is greater than the thickness of the light guiding and output section.

[0007] Preferably, the thickness of the light-guiding output portion is greater than the thickness of the light-guiding input portion.

[0008] Preferably, the thickness of the light-guiding output portion is 0.55-2 mm, and the thickness of the light-guiding input portion is 0.3-1 mm.

[0009] Preferably, the bottom surface of the light-guiding and light-emitting part is provided with light-guiding dots, and the distribution density of the light-guiding dots gradually increases from the periphery of the light-guiding and light-emitting part to the center of the light-guiding and light-emitting part.

[0010] Preferably, the inner surface of the light-shielding film is a reflective surface, and the outer surface of the light-shielding film is a light-shielding surface.

[0011] Preferably, a reflective film is attached to the bottom surface of the light-guiding and light-emitting part, and a diffusion film covering the light-guiding and light-emitting part is attached to the top surface of the light-shielding film.

[0012] Preferably, the light-guiding and light-emitting part and the reflective film are bonded together by a first film backing adhesive, and the light-shielding film and the diffuser film are bonded together by a second film backing adhesive.

[0013] Preferably, the bottom surface of the light guide portion extends with a plurality of spaced positioning ridges, and there is a slot for positioning the light source between two adjacent positioning ridges.

[0014] Another objective of the present invention is achieved through the following technical solution: The preparation method of the above-mentioned ultra-narrow bezel bent light guide plate includes the following steps: (S1) Take plastic light guide masterbatch, melt and inject it into the first injection molding machine, cool and demold it, or melt and inject it into the second injection molding machine, cool it, demold it, CNC shape processing and hot bending to obtain a light guide plate, wherein the light guide plate has a light guide emitting part, a bent light guide part extending to the side of the light guide emitting part, and a light guide entering part extending to the bottom surface of the bent light guide part; (S2) Take a light shielding film, and attach the light shielding film to the outer surface of the light guide entering part, the outer surface of the bent light guide part and the outer surface edge of the light guide emitting part; The injection mold of the first injection molding machine has a light-guiding output section, a bending light-guiding section, and a light-guiding input section, while the injection mold of the second injection molding machine has a planar light-guiding section.

[0015] Preferably, when the first injection molding machine performs molten injection molding, the inner top surface of the light guide section has a gradient dot protrusion structure, and the dot distribution density of the gradient dot protrusion structure gradually increases from the periphery of the light guide section to the center of the light guide section. After the second injection molding machine melts, injects, cools, and demolds, the light guide dots are first distributed on the bottom surface of the light guide part by the dot roller. Then, CNC shaping is performed, and the distribution density of the light guide dots gradually increases from the periphery of the light guide part to the center of the light guide part.

[0016] The beneficial effects of the present invention are as follows: The ultra-narrow bezel bent light guide plate of the present invention adopts a light guide plate and a light shielding film. The light guide plate includes a light emitting part, a bent light guide part extending to the side of the light emitting part, and a light receiving part extending to the bottom surface of the bent light guide part. The light shielding film is attached to the outer surface of the light receiving part, the outer surface of the bent light guide part, and the outer surface edge of the light emitting part. The bottom surface of the light receiving part is used to receive the light from the light source. When this ultra-narrow bezel bent light guide plate is actually installed in the deco area of ​​electronic products, it needs to be paired with a light source located on the bottom surface of the light guide input section. This ultra-narrow bezel bent light guide plate uses the bent light guide section to refract light from the light guide input section to the light guide output section. Furthermore, it uses a light-shielding film to shield the outer surfaces of the light guide input section, the bent light guide section, and the outer edge of the light guide output section, thereby improving the light efficiency. The light guide input section, the bent light guide section, and the light-shielding film work together to prevent the light spot in front of the lamp from being directly observed, overcoming the problem of limited overall spatial structure, especially the problem of limited structure in the width direction, and meeting the requirement of full-area light emission in the deco area of ​​electronic products.

[0017] In addition, the outer rounded corner radius of the bent light guide is more than twice the inner rounded corner radius of the bent light guide; the center rounded corner radius of the bent light guide is greater than the thickness of the light guide output part, which helps to avoid light from being blocked at the corner of the bent light guide. The bent light guide better conducts the refracted light to the light guide output part, resulting in higher refraction efficiency and better light utilization. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 2 This is a structural schematic diagram from another perspective of Embodiment 1 of the present invention; Figure 3 This is an exploded view of Embodiment 1 of the present invention; Figure 4 This is a partial structural schematic diagram of the light guide plate component described in Embodiment 1 of the present invention; Figure 5 This is a bottom view of the light guide plate component described in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 7 This is a structural schematic diagram from another perspective of Embodiment 2 of the present invention; Figure 8 This is a brightness test result diagram of the ultra-narrow bezel bent light guide plate of Example 1; Figure 9 This is a graph showing the brightness test results of the light guide plate in Comparative Example 1.

[0019] The attached figures are labeled as follows: 1. Light-shielding film; 2. Light guide plate; 21. Light-emitting part; 22. Bending light guide part; 23. Light-inlet part; 3. Light guide dots; 4. Reflective film; 5. Diffuser film; 6. First film backing adhesive; 7. Second film backing adhesive; 8. Positioning ridge; 9. Groove; 10. Light source. Detailed Implementation

[0020] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0021] Example 1 like Figure 1-5 As shown, an ultra-narrow bezel bent light guide plate includes a light guide plate 2 and a light-shielding film 1. The light guide plate 2 includes a light-emitting part 21, a bent light guide part 22 extending from the side of the light-emitting part 21, and a light-introducing part 23 extending from the bottom surface of the bent light guide part 22. The light-shielding film 1 is attached to the outer surface of the light-introducing part 23, the outer surface of the bent light guide part 22, and the outer surface edge of the light-emitting part 21. The bottom surface of the light-introducing part 23 is used to receive light from the light source 10.

[0022] When this ultra-narrow bezel bent light guide plate is actually installed in the deco area of ​​electronic products, it needs to be paired with a light source 10 located on the bottom surface of the light-inlet section 23 to emit light. This ultra-narrow bezel bent light guide plate uses the bent light guide section 22 to refract light from the light-inlet section 23 to the light-outlet section 21 for emission. Furthermore, the light-shielding film 1 shields the outer surfaces of the light-inlet section 23, the bent light guide section 22, and the outer edges of the light-outlet section 21, improving light efficiency. The light-inlet section 23, the bent light guide section 22, and the light-shielding film 1 work together to prevent the light spot from being directly observed, overcoming the problem of limited overall spatial structure, especially the limitation in the width direction, and meeting the requirement of full-area illumination in the deco area of ​​electronic products. Existing light sources 10 are GRB lamps or monochrome LED lamps, preferably GRB lamps. In this embodiment, the bent light guide section 22 extends around the light-outlet section 21, meaning that the light source 10 is located on the bottom surface of four light-inlet sections 23.

[0023] Furthermore, the bent light guide 22 is rounded at the corners, and the outer rounded corner radius R2 of the bent light guide 22 is more than twice the inner rounded corner radius R1 of the bent light guide 22; the center rounded corner radius R3 of the bent light guide 22 is greater than the thickness H1 of the light guide output part 21, which helps to avoid light from being blocked at the corner of the bent light guide 22. The bent light guide 22 better conducts the refracted light to the light guide output part 21, resulting in higher refraction efficiency and better light utilization.

[0024] Furthermore, the thickness H1 of the light-emitting portion 21 is greater than the thickness H2 of the light-incoming portion 23, so that the thickness of the bent light-guiding portion 22 gradually refracts the light, allowing the light to be refracted into the light-emitting portion 21 more efficiently, which is more conducive to avoiding the light from being blocked at the corner of the bent light-guiding portion 22.

[0025] Furthermore, the thickness H1 of the light-emitting portion 21 is 0.55-2 mm, and the thickness H2 of the light-incoming portion 23 is 0.3-1 mm, while still satisfying the prerequisite that the thickness H1 of the light-emitting portion 21 is greater than the thickness H2 of the light-incoming portion 23. Preferably, the thickness of the light-emitting portion 21 is 0.65-2 mm, and the thickness of the light-incoming portion 23 is 0.3-0.6 mm; in this embodiment, the thickness of the light-emitting portion 21 is 0.8 mm, the thickness of the light-incoming portion 23 is 0.55 mm, the outer rounded corner radius of the bent light guide portion 22 is 1.4 mm, the inner rounded corner radius of the bent light guide portion 22 is 0.6 mm, and the center rounded corner radius of the bent light guide portion 22 is 1.0 mm.

[0026] Furthermore, the bottom surface of the light-guiding and light-emitting part 21 is distributed with light-guiding dots 3, and the distribution density of the light-guiding dots 3 gradually increases from the periphery of the light-guiding and light-emitting part 21 to the center of the light-guiding and light-emitting part 21. Through the gradual arrangement of the light-guiding dots 3, uniform light emission is achieved on the top surface of the entire light-guiding and light-emitting part 21.

[0027] Furthermore, the inner surface of the light-shielding film 1 is a reflective surface, and the outer surface of the light-shielding film 1 is a light-shielding surface, which is more conducive to the reflection of light from the outer surface of the light-guiding light-inlet part 23, the outer surface of the bent light-guiding part 22, and the outer surface of the light-guiding light-out part 21 back to the light guide plate 2, thereby improving the refractive efficiency of the light guide plate 2 and improving the light utilization rate.

[0028] Furthermore, a reflective film 4 is attached to the bottom surface of the light-guiding and light-emitting part 21, and a diffusion film 5 covering the light-guiding and light-emitting part 21 is attached to the top surface of the light-shielding film 1. In this embodiment, the thickness of the reflective film 4 is 0.05 mm, and the thickness of the diffusion film 5 is 0.05 mm. The reflective film 4 reflects the light from the bottom surface of the light-guiding and light-emitting part 21 back to the light-guiding and light-emitting part 21, which helps to improve the brightness of the light-guiding and light-emitting part 21. The diffusion film 5 atomizes the optical texture of the light-guiding and light-emitting part 21, making the top surface of the light-emitting part 21 appear more uniform and softer. In addition, under the combined action of the reflective film 4, the light-shielding film 1, the bent light-guiding part 22, and the light-guiding dots 3, the light-emitting part 21 has higher brightness and more uniform and softer light emission. Compared with traditional planar light guide plates, this ultra-narrow bezel bent light guide plate can provide higher brightness with lower energy consumption, which is more conducive to energy saving.

[0029] Furthermore, the light-guiding and light-emitting part 21 and the reflective film 4 are bonded together by a first film backing adhesive 6, and the light-shielding film 1 and the diffuser film 5 are bonded together by a second film backing adhesive 7.

[0030] The above-mentioned method for preparing an ultra-narrow bezel bent light guide plate includes the following steps: (S1) Take plastic light guide masterbatch, melt and inject it into a single piece using a first injection molding machine, cool and demold to obtain a light guide plate 2. The light guide plate 2 has a light guide emitting part 21, a bent light guide part 22 extending to the side of the light guide emitting part 21, and a light guide entering part 23 extending to the bottom surface of the bent light guide part 22; (S2) Take a light shielding film 1, and attach the light shielding film 1 to the outer surface of the light guide entering part 23, the outer surface of the bent light guide part 22, and the outer surface edge of the light guide emitting part 21. The injection mold of the first injection molding machine has a light-guiding output section, a bending light-guiding section, and a light-guiding input section.

[0031] The inner top surface of the light-guiding and light-emitting section has a gradient dot protrusion structure. The dot distribution density of the gradient dot protrusion structure gradually increases from the periphery of the light-guiding and light-emitting section to the center of the light-guiding and light-emitting section, so that the bottom surface of the light-guiding and light-emitting section 21 is distributed with light-guiding dots 3.

[0032] The preparation method of the ultra-narrow bezel bent light guide plate also includes the following steps: (S3) Take the reflective film 4 and attach the reflective film 4 to the bottom surface of the light guide and light output part 21 through the first film backing adhesive 6; (S4) Take the diffuser film 5 and attach the diffuser film 5 to the top surface of the light shielding film 1 through the second film backing adhesive 7.

[0033] Example 2 The difference between this embodiment and Embodiment 1 is that: like Figure 6-7 As shown, the bottom surface of the light guiding and light-introducing part 23 extends with a plurality of spaced positioning ridges 8, and there is a slot 9 between two adjacent positioning ridges 8 for positioning the light source 10. The light-shielding film 1 extends and adheres to the outer surface of the positioning ridges 8, and the light-shielding film 1 covers the outer side of the slot 9.

[0034] The above-mentioned method for preparing an ultra-narrow bezel bent light guide plate includes the following steps: (S1) Take plastic light guide masterbatch, melt and inject it through a second injection molding machine, cool it, demold it, perform CNC shaping and hot bending treatment to obtain a light guide plate 2. The light guide plate 2 has a light guide emitting part 21, a bent light guide part 22 extending to the side of the light guide emitting part 21, and a light guide entering part 23 extending to the bottom surface of the bent light guide part 22; (S2) Take a light shielding film 1 and attach the light shielding film 1 to the outer surface of the light guide entering part 23, the outer surface of the bent light guide part 22 and the outer surface edge of the light guide emitting part 21. The injection mold of the second injection molding machine has a planar light guide section.

[0035] After the second injection molding machine melts, injects, cools, and demolds, the light guide dots 3 are distributed on the bottom surface of the light guide part 21 by the dot roller. Then, CNC machining is performed to make the four periphery of the light guide plate 2 have multiple spaced positioning ridges 8, and there are slots 9 between two adjacent positioning ridges 8 for positioning the light source 10. The distribution density of the light guide dots 3 gradually increases from the periphery of the light guide part 21 to the center of the light guide part 21.

[0036] The preparation method of the ultra-narrow bezel bent light guide plate also includes the following steps: (S3) Take the reflective film 4 and attach the reflective film 4 to the bottom surface of the light guide and light output part 21 through the first film backing adhesive 6; (S4) Take the diffuser film 5 and attach the diffuser film 5 to the top surface of the light shielding film 1 through the second film backing adhesive 7.

[0037] Comparative Example 1 A light guide plate is a planar light guide plate, wherein a reflective film is attached to the bottom surface of the light guide plate, a diffusion film is attached to the top surface of the light guide plate, and the four sides of the light guide plate are used to receive light from a light source.

[0038] Performance testing: The ultra-narrow bezel bent light guide plate from Example 1 was used with a PCB light board containing RGB lights, and the light was emitted from the bottom surface of the light guide section. A CCD brightness meter was used to test the brightness, and the test results are as follows: Figure 8 As shown in the figure, its maximum brightness is 443 cd / m². 2 The minimum brightness is 355 cd / m². 2 The average brightness is 412 cd / m². 2 The uniformity (minimum / maximum value) is 80.2%; Take the light guide plate of Comparative Example 1, and pair it with a PCB light board with RGB lights, similar to that in Example 1, to emit light from the four sides of the light guide plate. A CCD brightness meter is used to test the brightness, and the test results are as follows: Figure 9 As shown in the figure, its maximum brightness is 468 cd / m². 2 The minimum brightness is 229 cd / m². 2 The average brightness is 360 cd / m². 2 The uniformity (minimum / maximum) is 49.1%. The test results show that, compared with the light guide plate of Comparative Example 1, the uniformity of the ultra-narrow bezel bent light guide plate of Example 1 is improved by about 63.3%.

[0039] The above embodiments are preferred implementations of the present invention. In addition, the present invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the present invention are within the protection scope of the present invention.

Claims

1. An ultra-narrow bezel bent light guide plate, characterized in that: The device includes a light guide plate and a light shielding film. The light guide plate includes a light emitting part, a bent light guide part extending to the side of the light emitting part, and a light receiving part extending to the bottom surface of the bent light guide part. The light shielding film is attached to the outer surface of the light receiving part, the outer surface of the bent light guide part, and the side edge of the outer surface of the light emitting part. The bottom surface of the light receiving part is used to receive light from the light source. The bent light guide section is rounded at the corners, and the outer rounded corner radius of the bent light guide section is more than twice the inner rounded corner radius of the bent light guide section; the center rounded corner radius of the bent light guide section is greater than the thickness of the light guiding and output section.

2. The ultra-narrow bezel bent light guide plate according to claim 1, characterized in that: The thickness of the light-guiding output section is greater than the thickness of the light-guiding input section.

3. The ultra-narrow bezel bent light guide plate according to claim 2, characterized in that: The thickness of the light-guiding output section is 0.55-2mm, and the thickness of the light-guiding input section is 0.3-1mm.

4. The ultra-narrow bezel bent light guide plate according to claim 1, characterized in that: The bottom surface of the light-guiding and light-emitting part is distributed with light-guiding dots, and the distribution density of the light-guiding dots gradually increases from the periphery of the light-guiding and light-emitting part to the center of the light-guiding and light-emitting part.

5. The ultra-narrow bezel bent light guide plate according to claim 1, characterized in that: The inner surface of the light-shielding film is a reflective surface, and the outer surface of the light-shielding film is a light-shielding surface.

6. The ultra-narrow bezel bent light guide plate according to claim 1, characterized in that: A reflective film is attached to the bottom surface of the light-guiding and light-emitting part, and a diffusion film covering the light-guiding and light-emitting part is attached to the top surface of the light-shielding film.

7. The ultra-narrow bezel bent light guide plate according to claim 6, characterized in that: The light-guiding and light-emitting part and the reflective film are bonded together by a first film adhesive, and the light-shielding film and the diffuser film are bonded together by a second film adhesive.

8. The ultra-narrow bezel bent light guide plate according to claim 1, characterized in that: The bottom surface of the light guide section extends with multiple spaced positioning ridges, and there are slots between two adjacent positioning ridges for positioning the light source.

9. A method for preparing an ultra-narrow bezel bent light guide plate as described in any one of claims 1-8, characterized in that, The process includes the following steps: (S1) Take plastic light guide masterbatch, melt and inject it into the first injection molding machine, cool and demold it, or melt and inject it into the second injection molding machine, cool it, demold it, CNC shape processing and hot bending process to obtain a light guide plate. The light guide plate has a light guide emitting part, a bent light guide part extending to the side of the light guide emitting part, and a light guide entering part extending to the bottom surface of the bent light guide part; (S2) Take a light shielding film and attach the light shielding film to the outer surface of the light guide entering part, the outer surface of the bent light guide part and the outer surface side edge of the light guide emitting part. The injection mold of the first injection molding machine has a light-guiding output section, a bending light-guiding section, and a light-guiding input section, while the injection mold of the second injection molding machine has a planar light-guiding section.

10. The method for preparing an ultra-narrow bezel bent light guide plate according to claim 9, characterized in that: When the first injection molding machine melts and injects the light into the whole, the inner top surface of the light guide section has a gradient dot protrusion structure. The dot distribution density of the gradient dot protrusion structure gradually increases from the periphery of the light guide section to the center of the light guide section. After the second injection molding machine melts, injects, cools, and demolds, the light guide dots are first distributed on the bottom surface of the light guide part by the dot roller. Then, CNC shaping is performed, and the distribution density of the light guide dots gradually increases from the periphery of the light guide part to the center of the light guide part.

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