Processing method of light guide plate dot side mold core, light guide plate mold core and light guide plate

Abstract

The application discloses a processing method of a light guide plate net point side mold core, a light guide plate mold core and a light guide plate. The processing method of the light guide plate net point side mold core comprises the following steps: taking a mold core body, grinding one surface of the mold core body, and processing a net point on the ground surface of the mold core body. The grinding direction of the mold core body is parallel to the light incidence direction of the light guide plate processed by the mold core. The surface roughness of the ground surface of the mold core body is Ra, wherein 0.3um<=Ra<=0.5um. The net point is processed by using a laser processing and / or a point impact process. The light guide plate mold core processed by the method has good shielding performance, and the haze effect of the light guide plate manufactured by injection molding is good when the light guide plate is used on a liquid crystal display.

Description

Technical Field

[0001] This invention relates to a processing method for a dot-side mold core of a light guide plate, a light guide plate mold core, and a light guide plate, belonging to the technical field of light guide plates for liquid crystal displays. Background Technology

[0002] Light guide plates are an important component of LCDs, possessing advantages such as ultra-thinness, ultra-brightness, and uniform light guidance. They are mainly used in the backlight of LCDs. The function of a light guide plate is to transform a line light source into a surface light source. Currently, commonly used mass-produced light guide plates include ordinary flat light guide plates, V-cut light guide plates, lenti light guide plates, and high-brightness light guide plates. Among them, ordinary flat light guide plates are less expensive, but their shielding effect is also lower, and their brightness is generally average. V-cut light guide plates and lenti light guide plates both have high brightness, but both are more expensive, and their shielding effect is also generally average. High-brightness light guide plates have high brightness, but their shielding effect is lower, and their price is higher than other light guide plates.

[0003] The manufacturing of light guide plates involves using a mold core to create a mold, which is then injection molded into a light guide plate. The processing of the mold core typically involves the mold core body itself undergoing rough grinding and fine grinding processes to uniformly grind the surface of the mold core, giving the surface with the processed dots a mirror effect. After grinding, the surface roughness Ra of the mold core body is <0.02um. The purpose of the dots is to improve the opacity of the light guide plate. Because the surface of the mold core is smooth, the opacity on the dot side of the manufactured light guide plate is relatively poor, resulting in a poor haze effect on the LCD display during use. Summary of the Invention

[0004] The first objective of this invention is to provide a method for processing a dot-side mold core for a light guide plate, thereby solving the technical defects of poor haze effect and poor occlusion of the light guide plate image produced by processing the light guide plate mold core in the prior art.

[0005] To solve the above problems, the technical solution adopted by this invention is as follows: A method for processing the dot-side mold core of a light guide plate involves first taking a mold core body, grinding one surface of the mold core body, and then processing dots on the ground surface of the mold core body. The grinding direction of the mold core body is parallel to the light incident direction of the light guide plate processed by the mold core. The surface roughness of the ground surface of the mold core body after grinding is Ra, where 0.3um≤Ra≤0.5um. The dot processing employs laser processing and / or dot-mapping technology. Before processing dots on the mold core body, this invention limits the grinding direction and the roughness of the surface of the mold core body, making the surface texture of the mold core body fine and dense, thereby improving the haze effect and masking properties of the light guide plate manufactured from this mold core. In this invention, the surface roughness of the mold core body is 0.3um≤Ra≤0.5um and remains consistent, ensuring that the manufactured light guide plate will not exhibit uneven lighting or noticeable bright and dark stripes.

[0006] As a further improvement of the present invention, the diameter of the dots is D, where 40um ≤ D ≤ 60um, and the depth of the dots is h, where 4um ≤ h ≤ 6um. The dot diameter and depth of the present invention correspond to the best shielding performance of the manufactured light guide plate.

[0007] As a further improvement of the present invention, a tungsten carbide grinding wheel with a mesh size of 1200 is used for grinding the mold core body, and the grinding speed of the tungsten carbide grinding wheel is 1100 r / min. By limiting the mesh size of the tungsten carbide grinding wheel and the grinding speed, the present invention can effectively ensure that the surface roughness of the mold core body is between 0.3 μm and 0.5 μm.

[0008] As a further improvement of the present invention, after grinding the mold core body, the surface roughness of the ground surface of the mold core body is first tested, and then dot matrix processing is performed on the ground surface of the mold core body. By testing the surface roughness of the mold core body after grinding, the present invention can ensure that the surface roughness of different mold cores remains consistent when repeatedly processing different mold cores.

[0009] As a further improvement of the present invention, the roughness detection of the grinding surface of the mold core body includes determining the number of sampling points on the grinding surface of the mold core body based on the area of ​​the ground surface of the mold core body, then sampling points on the grinding surface of the mold core body and measuring their roughness. The present invention determines the points for roughness measurement based on the area of ​​the mold core body, which can effectively ensure that the surface roughness of the mold core remains consistent.

[0010] As a further improvement of the present invention, the number of points taken on the polished surface of the mold core body is 3 points randomly selected within a 3.5-inch range for measurement. The number of points selected for roughness measurement in the present invention is optimal, which effectively maintains the consistency of roughness throughout without selecting an excessive number of points for measurement.

[0011] The second objective of this invention is to provide a light guide plate mold core, which is manufactured using a processing method for a light guide plate dot-side mold core. The light guide plate produced by the light guide plate mold core of this invention not only has a good image haze effect but also stronger shielding properties.

[0012] A third objective of this invention is to provide a light guide plate, comprising a light guide plate V-Cut side mold core and a light guide plate mold core as described in claim 7, forming a light guide plate injection mold. Material required for making the light guide plate is injected into the light guide plate injection mold for injection molding, wherein the V-Cut side of the light guide plate V-Cut side mold core in the light guide plate injection mold is opposite to the dot side of the light guide plate mold core. The light guide plate of this invention has better image haze effect, stronger shielding properties, and superior brightness gain compared to existing technologies.

[0013] In summary, the beneficial effects of the present invention are: the light guide plate mold core processed by the method of the present invention has good shielding properties and good haze effect when used in liquid crystal displays. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the mold core body after grinding in this invention.

[0015] Figure 2 This is a schematic diagram of the light guide plate in this invention.

[0016] The components include: 1. Mold core body; 2. Texture; 3. Light guide plate; 4. V-Cut structure; 5. Dots. Detailed Implementation

[0017] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Example 1

[0018] This embodiment describes a processing method for a dot-side mold core of a light guide plate. First, a mold core body 1 is taken, which is a rectangular plate. One surface of the mold core body 1 is ground. After grinding, dots are processed on the ground surface of the mold core body 1.

[0019] In this embodiment, the grinding direction of the mold core body 1 is parallel to the light injection direction of the light guide plate processed from the mold core. For example, grinding is performed on the upper surface of the mold core body 1 along the front-back direction, creating several parallel textures 2 on the upper surface of the mold core body 1 along the front-back direction. Figure 1 As shown, the surface roughness of one surface of the mold core body 1 after grinding is Ra, where 0.3um≤Ra≤0.5um.

[0020] In this embodiment, the halftone dots are processed using laser machining and / or dotting technology. Optimally, laser machining or dotting technology is used alone to process the halftone dots on the mold core body 1. The halftone dots are spherical grooves on the surface of the mold core body 1. In this embodiment, the diameter of the halftone dots is D, where 40µm ≤ D ≤ 60µm, and the depth of the halftone dots is h, where 4µm ≤ h ≤ 6µm.

[0021] In this embodiment, the grinding of the mold core body 1 is carried out using a tungsten carbide grinding wheel. The specific grinding parameters are as follows: the tungsten carbide grinding wheel has a mesh size of 1200 and the grinding speed of the tungsten carbide grinding wheel is 1100 r / min.

[0022] In this embodiment, after grinding the mold core body 1, the surface roughness of the ground surface of the mold core body 1 is measured first, and then the ground surface of the mold core body 1 is processed with dot matrix to ensure that the surface roughness of the ground surface of the mold core body 1 is between 0.3um and 0.5um.

[0023] In this embodiment, the roughness measurement of the grinding surface of the mold core body 1 includes determining the number of sampling points on the grinding surface of the mold core body 1 based on the area of ​​the grinding surface of the mold core body 1, then sampling points on the grinding surface of the mold core body 1 and measuring its roughness.

[0024] In this embodiment, the optimal number of points to be taken on the grinding surface of the mold core body 1 is as follows: within each 3.5-inch diagonal square area, 3 points are randomly selected for measurement; within each 7-inch diagonal square area, 12 points are randomly selected for measurement; and within each 15.6-inch diagonal square area, 54 points are randomly selected for measurement. The average value of all measurements must be between 0.3 μm and 0.5 μm. If the measured roughness is not within this range, grinding is performed again along the previous grinding direction until the measured roughness is within the range of 0.3 μm to 0.5 μm. Through the above measurements, this embodiment can determine whether the state of the mold core processed in this embodiment meets the design requirements. Example 2

[0025] This embodiment is a light guide plate mold core, which is processed using the processing method of the light guide plate dot side mold core of embodiment 1. The light guide plate made using this light guide plate mold core has dots on one side coexisting with grinding texture 2. Because the grinding texture 2 is fine, the haze effect of the image is good and the shielding is stronger than other light guide plates. Example 3

[0026] This embodiment is a light guide plate 3, which is made into a light guide plate injection mold by a V-Cut side mold core and a light guide plate mold core of embodiment 2. The material required to make the light guide plate is injected into the light guide plate injection mold to form the light guide plate. The V-Cut side of the V-Cut side mold core in the light guide plate injection mold is opposite to the dot side of the light guide plate mold core. The light guide plate formed has a V-Cut structure 4 on one surface of the V-Cut side mold core, and dots 5 are formed on the dot side surface of the light guide plate mold core. The texture on the light guide plate 3 is a protrusion corresponding to the shape of the dots on the light guide plate mold core in embodiment 2. In this embodiment, one side of the light guide plate dot structure has dots 5 and grinding texture 2 coexisting, and the other side has a V-Cut structure 4, as shown. Figure 2 As shown, this embodiment is superior to the prior art in terms of overall brightness gain, and the image has a better haze effect and stronger occlusion.

[0027] Unless otherwise specified in the above description, all parts are prior art, or can be implemented using existing technology. Furthermore, the specific embodiments described in this invention are merely preferred embodiments and are not intended to limit the scope of this invention. That is, all equivalent changes and modifications made within the scope of this invention should be considered within the technical scope of this invention.

Claims

1. A method for processing a dot-side mold core for a light guide plate, comprising: first, taking a mold core body, grinding one surface of the mold core body, and then processing dots on the ground surface of the mold core body, characterized in that: The grinding direction of the mold core body is parallel to the light incident direction of the light guide plate processed by the mold core. The surface roughness of one surface of the mold core body after grinding is Ra, where 0.3um≤Ra≤0.5um. The dot processing adopts laser processing and / or dot collision process. After grinding the mold core body, the surface roughness of the ground surface of the mold core body is first tested, and then the surface of the ground mold core body is processed with dots. The roughness detection of the grinding surface of the mold core body includes determining the number of sampling points on the grinding surface of the mold core body according to the area of ​​the grinding surface of the mold core body, then sampling points on the grinding surface of the mold core body and measuring its roughness. The number of points to be measured on the polished surface of the mold core body is as follows: within each square area with a diagonal of 3.5 inches, 3 points are randomly selected for measurement; within each square area with a diagonal of 7 inches, 12 points are randomly selected for measurement; and within each square area with a diagonal of 15.6 inches, 54 points are randomly selected for measurement. The average value of all measurements must be within the range of 0.3 μm to 0.5 μm. If the measured roughness is not within this range, polishing is performed again along the previous polishing direction until the measured roughness is within the range of 0.3 μm to 0.5 μm.

2. The processing method of the dot-side mold core of the light guide plate according to claim 1, characterized in that: The diameter of the dots is D, where 40um ≤ D ≤ 60um, and the depth of the dots is h, where 4um ≤ h ≤ 6um.

3. The processing method of the dot-side mold core of the light guide plate according to claim 1, characterized in that: The grinding of the mold core body is carried out using a tungsten carbide grinding wheel with a mesh size of 1200 and a grinding speed of 1100 r / min.

4. A light guide plate mold core processed using the processing method of any one of claims 1 to 3.

5. A light guide plate, characterized in that: A light guide plate injection mold is made from a light guide plate V-Cut side mold core and a light guide plate mold core as described in claim 4. The light guide plate injection mold is formed by injecting the material required to make the light guide plate into the light guide plate injection mold, wherein the V-Cut side of the light guide plate V-Cut side mold core in the light guide plate injection mold is opposite to the dot side of the light guide plate mold core.

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