Optical Sheet with Segmented Functional Layer for LCD Light Control
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Solution Overview
Problem
Existing image source units for liquid crystal displays face challenges in maximizing light usage efficiency due to absorption by optical functional layers and potential moire interference fringes caused by stripe patterns, which affect image quality.
Innovation Solution
An image source unit comprising a liquid crystal panel with polarizing plates and an optical sheet that includes a base material layer, an optical functional layer with transmissive and absorbing portions, and an adhesive layer, where the optical sheet is designed to direct light efficiently and minimize moire interference by controlling light angles and refractive indices, enhancing light transmission and absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If an optical functional layer with light absorbing portions is used to improve light direction control, then light direction control is improved, but light usage efficiency decreases due to absorption of effective light
Solution Approach 1:
The optical functional layer is segmented into alternating light transmissive portions and light absorbing portions. This segmentation allows different regions to perform different functions: transmissive portions maintain light transmission while absorbing portions control light direction, thereby resolving the contradiction between direction control and light efficiency
Solution Approach 2:
Different portions of the optical functional layer have different optical properties. The light transmissive portions have high transmission quality while the light absorbing portions have high absorption quality. This local differentiation allows the layer to simultaneously achieve good light direction control and maintain overall light usage efficiency
2Difficulty of detecting and measuring
If an optical functional layer with stripe patterns is used to control light, then light direction control is improved, but moire interference fringes occur due to relationship with liquid crystal panel pixels
Solution Approach 1:
The optical functional layer uses asymmetric positioning of light transmissive portions relative to the liquid crystal panel pixels. The transmissive portions are positioned at specific locations that do not align with the pixel grid, thereby controlling light direction while avoiding the formation of moire interference fringes
Solution Approach 2:
The optical functional layer acts as an intermediary between the light source and the liquid crystal panel. By strategically positioning its transmissive portions, it mediates the light path to achieve direction control while preventing the direct interaction between regular patterns that causes moire fringes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution improves light usage efficiency and reduces defects like contrast degradation and color inversion, resulting in enhanced image quality and reduced moire interference fringes.
Implementation Method 1
the lower polarizing plate of the liquid crystal panel and the optical sheet are adhered to each other by the adhesive layer
Implementation Method 2
the optical functional layer includes a plurality of light transmissive portions having one extending direction along a face of the base material layer and having a predetermined cross section
Implementation Method 3
an in-between portion(s) formed in each of the intervals of the adjacent light transmissive portions
Data Source
AI summary
Provided is an image source unit including a layer including a light transmissive portion and an in-between portion, which can improve the use efficiency of light from a light source and improve the quality of display, including a liquid crystal panel and an optical sheet arranged on a lower polarizing plate side from the liquid crystal panel, wherein: the optical sheet includes a base material layer, an optical functional layer, and an adhesive layer; the optical functional layer includes a plurality of light transmissive portions having one extending direction along a face of the base material layer having a predetermined cross section, arranged in a different direction from the extending direction at predetermined intervals, and a plurality of in-between portions formed in the intervals of the adjacent light transmissive portions; and the lower polarizing plate and the optical sheet are adhered to each other by the adhesive layer.