激光加工导光板网点形状对光学特性的影响研究

Study on the Influence of Laser Machining Screen Dot Shape of Light Guide Plate on Optical Properties

摘要: 导光板是液晶显示器的光源核心部件，其性能直接影响液晶显示器的成像质量。目前散射网点的研究多建立于球形网点形状基础之上。而实际生产中，为了提高加工效率，采用二维并联机构激光加工散射网点的形状为大小不一的半椭球形，因此现有研究结果不够精确。本文针对不同形状的散射网点进行了分析，基于Trace Pro软件建立了导光板的仿真模型，研究了不同网点形状对均匀性及光通量的影响。结果表明，当网点形状为棱柱、圆锥、半圆球和半椭球时，导光板的光通量依次增大，分别为1829.1W/m²、2799.6 W/m²、3120.4 W/m²和3505.5 W/m²。按照优化后的网点分布设计，散射网点为半椭球时均匀性最大，可以达到91%，能够很好地适应现有生产平台的使用。该研究结果对于实际生产具有一定的指导意义，有助于提高导光板产品良率，减少生产成本。

Abstract: Lightguide plate is the core component of the light source of liquid crystal display (LCD), and its performance directly affects the imaging quality of LCD. At present, the research of scattering dot is mostly based on the hemispherical dot. In actual production, the shapes of scattered dot machined by two-dimensional parallel mechanism laser are semi ellipsoid with different sizes in order to improve the processing efficiency. Therefore, the existing research results are not accurate enough. In this paper, optical properties of scattering dot with difference shapes were analyzed; the simulation model of light guide plate was established based on Trace Pro Software; and the influences of different dot shapes on the uniformity and luminous flux were researched. The results indicate that when the dot shape is prism, cone, hemisphere and semi-ellipsoid, the optical flux of the guide plate is 1829.1 W/m², 2799.6 W/m², 3120.4 W/m² and 3505.5 W/m², respectively, which increases successively. According to the optimized dot distribution design, the uniformity is the largest when the scattered dots are semi-ellipsoid, which can reach 91% and can be well adapted to the existing production platform. The results of this study have certain guiding significance for the actual production, which is helpful to improve the yield and reduce the production cost of guide plate.