Screen dot processing technology for improving brightness of light guide plate
By adopting secondary dot processing technology on the light guide plate, small-diameter dots are embedded between normal-diameter dots, increasing the dot density, solving the problem of low brightness of the light guide plate and achieving higher light utilization efficiency and brightness.
Patent Information
- Application Number
- CN202311552921.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-20
- Publication Date
- 2025-05-20
AI Technical Summary
The density of existing light guide plates is too small, resulting in a large proportion of light transmitted by the light source being projected to the tail and losing, resulting in a low brightness of the light guide plate.
The secondary dot processing technology is adopted, and small-diameter dots are embedded between normal diameter dots to increase the dot density, allowing the light emitted by the LED to pass through the dot surface, and most of the light is scattered and reflected, improving the light utilization efficiency.
By increasing the dot density, the brightness and light utilization efficiency of the light guide plate are improved, and the brightness of the LGP front surface of the backlight and the uniformity of the light guide plate are improved.
Smart Images
Figure CN120019942A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of light guide plate processing, and specifically to a dot processing technology for improving the brightness of a light guide plate. Background Art
[0002] With the development of electronic technology, the market for flat panel displays has expanded rapidly. Among them, liquid crystal displays are required to have characteristics such as thin thickness, light weight, and low power consumption. The backlight module provides light sources for liquid crystal displays, and the performance of the backlight source directly affects the quality of liquid crystal displays. Improving the performance of the backlight module has a profound impact on the liquid crystal display industry. According to the different positions of the light source distribution, the backlight module can be divided into direct-lit type and edge-lit type. The commonly used type in the industry is the edge-lit backlight source. The edge-lit backlight source is that the light source is placed on the side of the backlight mold. After the LED emits light, the light is transmitted through the light guide plate to change the direction of light transmission and evenly distribute the light. After passing through the diffusion film and the brightness enhancement film, the light is converged in the light-emitting area and reaches a certain brightness standard.
[0003] The effect of the light guide plate directly determines the visual effect and brightness of the backlight liquid crystal module. The light guide plate is a high-tech product that converts a point light source or a line light source into a surface light source, mainly used for the backlight source in the display industry. With the market demand, the backlight source is required to be ultra-thin, ultra-bright, evenly light-guided, energy-saving and environmentally friendly, and have a perfect visual effect. The industry adopts the edge-lit backlight module. The LED light source of the edge-lit backlight module is located on one side of the light guide plate. The light emitted by the LED propagates in the light guide plate, and the propagation path will undergo reflection and total reflection on different surfaces. There are three surfaces that affect the optical performance of the light guide plate: the light incident surface, the light exit surface, and the dot surface. The structure of the dot surface directly affects the intensity of the light emitted by the LED entering the light guide plate. The higher the dot density, the higher the light utilization efficiency on the premise of ensuring uniformity.
[0004] At present, the light-reflecting surface of the light guide plate is provided with a common dot structure. When the sawtooth structure of the light incident surface and the micro-card structure of the light exit surface are selected, according to the actual thickness of the light guide plate, the length of the light guide plate, the designed dot size, and the processed dot depth, the dot density grading parameter can be obtained. To improve the light utilization rate, usually the dot density of the light source is sparse, and the dot density of the tail is dense. The dot density of the tail is 30%-35%, and the minimum actual distance between the dots at the tail is about 0.02 mm. If the dot density is increased further, there will be a problem of poor dot connection. When the density of the traditional light guide plate reaches a certain value, the brightness cannot be further improved, which cannot meet the social needs. Therefore, a dot processing technology for improving the brightness of the light guide plate is proposed to solve the above-mentioned technical problems. Summary of the Invention
[0005] (I) Technical Problems to be Solved
[0006] In view of the deficiencies of the prior art, the present invention provides a dot processing technology for improving the brightness of a light guide plate, which has the advantages of high light utilization efficiency, etc., and solves the problem that the dot density of the existing light guide plate is too small, and a large proportion of the light transmitted by the light source is projected to the tail and lost, resulting in low brightness of the light guide plate.
[0007] (II) Technical solution
[0008] To achieve the above object, the present invention provides the following technical solution: A dot processing technology for improving the brightness of a light guide plate, comprising the following steps:
[0009] S1: Mold processing, processing the mold according to the requirements of the drawing;
[0010] S2: Processing normal diameter laser dots on the front mold core, secondary dot processing, and inlaying small diameter dots between the normal diameter dots;
[0011] S3: Injection molding, installing the mold on an injection molding machine for injection molding, and then cooling and forming to obtain a light guide plate.
[0012] By adopting the above technical solution, through secondary dot processing, small diameter dots are inlaid between the normal diameter dots, increasing the dot density, so that the light emitted by the LED passes through the dot surface, and most of the light undergoes scattering and reflection phenomena, improving the light utilization efficiency, thereby improving the front brightness of the backlight LGP.
[0013] Furthermore, the dot density at the tail of the light guide plate's light-returning surface is 30% - 35%, and through secondary dot processing, the dot density at the tail increases by 1% - 2%.
[0014] By adopting the above technical solution, the density of the light guide plate's light-returning surface reaches about 31% - 37%, the surface diffuse reflection ratio of the dots reaches the peak value, and the diffuse reflection effect is good. When the density is increased further, the dot brightness basically remains unchanged.
[0015] Furthermore, when using a laser machine to process the dots of the light guide plate, the processing power of the normal diameter dots is 45 watts - 60 watts, and the processing power of inlaying small dots is 20 watts - 30 watts.
[0016] By adopting the above technical solution, the power of inlaying small dots is half of the diameter of the normal dots, and the dots are not easily adhered together to form defective white dots.
[0017] Furthermore, the density of the small dots changes.
[0018] By adopting the above technical solution, through the processing method of dot inlaying, the changing trend of the dot density is adjusted, and the uniformity of the light guide plate is improved.
[0019] Furthermore, the entire surface of the light guide plate's light-emitting surface is inlaid with small dots.
[0020] By adopting the above technical solution, the haze of the light guide plate is improved, and the light-shielding effect of the light guide plate is increased.
[0021] Furthermore, the compensation method for the dark area of the light guide plate lamp.
[0022] By adopting the above technical solution, the optical effect of the light inlet is improved.
[0023] (III) Beneficial effects
[0024] Compared with the prior art, the present invention provides a dot processing technology for improving the brightness of a light guide plate, which has the following beneficial effects:
[0025] 1. For the dot processing technology for improving the brightness of the light guide plate, by using secondary dot processing, small-diameter dots are inlaid between dots with normal diameters, increasing the dot density. When the light emitted by the LED passes through the dot surface, most of the light undergoes scattering and reflection phenomena, improving the light utilization efficiency, and thus increasing the front brightness of the LGP.
[0026] 2. For the dot processing technology for improving the brightness of the light guide plate, by changing the small dot density, the changing trend of the dot density is adjusted to improve the uniformity of the light guide plate. Through the compensation method for the dark area of the light guide plate lamp, the optical effect of the light inlet is improved. Description of the drawings
[0027] Figure 1 is a flowchart of a dot processing technology for improving the brightness of a light guide plate according to the present invention;
[0028] Figure 2 is a schematic structural diagram of the inlaid dots of a dot processing technology for improving the brightness of a light guide plate according to the present invention.
[0029] 1. Light guide plate; 2. Normal dots; 3. Small-diameter dots. Specific implementation manners
[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings and embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0031] Please refer to Figure 1-2 , a dot processing technology for improving the brightness of a light guide plate in this embodiment includes the following steps:
[0032] S1: Mold processing, processing the mold according to the drawing requirements;
[0033] S2: Processing normal-diameter laser dots on the front mold core, and performing secondary dot processing to inlay small-diameter dots between the normal-diameter dots;
[0034] S3: Injection molding. Install the mold on an injection molding machine for injection molding, and then cool it to form a light guide plate.
[0035] By adopting the above technical solution, through secondary dot processing, small-diameter dots are inlaid between normal-diameter dots to increase the dot density. When the light emitted by the LED passes through the dot surface, most of the light undergoes scattering and reflection phenomena, improving the light utilization efficiency and thus enhancing the front brightness of the backlight LGP.
[0036] In this embodiment, the front mold core of the mold is polished into a mirror surface, and laser dots are processed on the mirror surface. Small dots are inlaid between large dots through secondary dot processing.
[0037] In this embodiment, laser dots with normal diameter are processed on the front mold core, and through secondary dot processing, small-diameter dots are inlaid between normal-diameter dots. The diameter of the small dots is about half of the normal diameter, and the density at the tail is increased by 5%, obtaining a light guide plate with improved actual brightness.
[0038] It should be noted that the dots in this embodiment are all laser micro-crater dots, and the dot density at the tail of the light guide plate in this embodiment is greater than the dot density of the light source.
[0039] Specifically, the dot density at the tail of the light-reflecting surface of the light guide plate is 30% - 35%. Through secondary dot processing, the density of the dots at the tail is increased by 1% - 2%. By adopting the above technical solution, the density of the light-reflecting surface of the light guide plate reaches about 31% - 37%. The surface diffuse reflection ratio of the dots reaches the peak value, and the diffuse reflection effect is good. When the density is further increased, the dot brightness basically remains unchanged.
[0040] Specifically, when the laser machine processes the dots of the light guide plate, the processing power of the normal-diameter dots is 45 watts - 60 watts, and the processing power of the inlaid small dots is 20 watts - 30 watts. By adopting the above technical solution, the power of the inlaid small dots is half of the diameter of the normal dots, and the dots are not easily adhered together to form defective white dots.
[0041] Specifically, the density of the small dots changes. By adopting the above technical solution, through the processing method of dot inlay, the changing trend of the dot density is adjusted to improve the uniformity of the light guide plate.
[0042] Specifically, the entire surface of the light guide plate's light-emitting surface is inlaid with small dots. By adopting the above technical solution, the haze of the light guide plate is increased, enhancing the light guide plate's effect of covering defects.
[0043] Specifically, the compensation method for the dark area of the light guide plate's lamp. By adopting the above technical solution, the optical effect of the light inlet is improved.
[0044] The beneficial effects of the present invention are:
[0045] The dot processing technology for improving the brightness of the light guide plate uses secondary dot processing. Small-diameter dots are inlaid between normal-diameter dots to increase the dot density. When the light emitted by the LED passes through the dot surface, most of the light undergoes scattering and reflection phenomena, improving the light utilization efficiency and thus increasing the front brightness of the LGP.
[0046] The dot processing technology for improving the brightness of the light guide plate adjusts the trend of dot density change by varying the small dot density, improving the uniformity of the light guide plate. Through the light guide plate light and dark area compensation method, the optical effect of the light inlet is improved.
[0047] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A dot processing process for improving the brightness of a light guide plate, characterized in that: The following steps are involved: S1: Mould processing, mould processing according to drawing requirements; S2: Process normal diameter laser dots on the front mold core, perform secondary dot processing, and inlay small diameter dots between normal diameter dots; S3: Injection molding: installing the mold on an injection molding machine for injection molding, and then molding and cooling to obtain a light guide plate.
2. The dot processing technology for improving the brightness of a light guide plate according to claim 1, characterized in that: The dot density at the tail of the light guide plate's return surface is 30%-35%. Through secondary processing of the dots, the density of the tail dots increases by 1%-2%.
3. The dot processing technology for improving the brightness of a light guide plate according to claim 2, characterized in that: The laser machine processes the dots of the light guide plate. The processing power of the dots with normal diameter is 45 watts to 60 watts, and the processing power of the inlaid small dots is 20 watts to 30 watts.
4. The dot processing technology for improving the brightness of a light guide plate according to claim 3, characterized in that: All the dots are laser micro-crater dots.
5. The dot processing technology for improving the brightness of a light guide plate according to claim 4, characterized in that: The front mold core of the mold is polished into a mirror surface, and the laser dots are processed with the mirror surface. The dots are processed twice to make small dots embedded between the large dots.
6. The dot processing process for improving the brightness of a light guide plate according to claim 5, characterized in that: The dot density at the tail of the light guide plate is greater than the dot density of the light source.
7. The dot processing technology for improving the brightness of a light guide plate according to claim 6, characterized in that: In S2, normal diameter laser dots are processed on the front mold core, and secondary dot processing is performed. Small diameter dots are embedded between normal diameter dots. The diameter of the small dots is about half of the normal diameter, and the tail density is increased by 5%, resulting in a light guide plate with improved actual brightness.