Light Guide Plate Prism Angle Compensation for Display Uniformity
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Solution Overview
Problem
Conventional light guide plates in liquid crystal displays suffer from light distortion and non-uniform intensity distribution due to defective portions, leading to issues like horizontal dark lines and reduced display quality.
Innovation Solution
A light guide plate design featuring a wedge-shaped body with reflective prisms on one surface and a protruding portion at the edge, which compensates for light distortions by adjusting the angles of the prisms to ensure uniform light distribution and minimize defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional light guide plates are used, then the structure is simple, but light distortion and non-uniform intensity distribution occur due to defective portions
Solution Approach 1:
The patent applies local quality by positioning a protruding portion at a specific location (edge of the light guide plate adjacent to the opposite surface) to compensate for light distortion in the defective area. This localized structural modification targets the specific region where light uniformity issues occur, rather than requiring global structural changes throughout the entire light guide plate.
Solution Approach 2:
The protruding portion creates an asymmetric structure on the light guide plate edge, which compensates for the asymmetric light distortion caused by defective portions. The asymmetric geometry of the protruding portion is designed to redirect light paths in a way that balances the non-uniform light distribution, converting the asymmetric defect into a compensatory asymmetric feature.
2Reliability
If the light guide plate structure is modified to compensate for defects, then display quality improves, but manufacturing complexity increases
Solution Approach 1:
The light guide plate is segmented into distinct functional regions: the main body, the opposite surface with prisms, and the edge region with the protruding portion. This segmentation allows each region to be optimized independently for its specific function while maintaining overall manufacturing feasibility through standardized production processes.
Solution Approach 2:
The patent modifies geometric parameters of the light guide plate by adding a protruding portion with specific dimensions and positioning. This parameter change (adding the protrusion) is designed to compensate for light distortion while remaining compatible with existing manufacturing capabilities, avoiding the need for completely new manufacturing processes.
3Illumination intensity
If prisms are added to the light guide plate, then light distribution uniformity improves, but the device complexity increases
Solution Approach 1:
The patent merges multiple optical functions into a single integrated structure: the light guide plate body, the prism array on the opposite surface, and the protruding portion at the edge work together as a unified optical system. This merging eliminates the need for separate components to address light distribution and distortion compensation, reducing overall device complexity while maintaining improved light uniformity.
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 enhances light uniformity and reduces the occurrence of dark lines, resulting in improved display quality and consistent illumination across the display panel.
Implementation Method 1
a plurality of prisms disposed on an opposite surface
Implementation Method 2
a protruding portion disposed at an edge of an upper surface of the body, adjacent to the opposite surface and protruded upwardly from the upper surface
Data Source
AI summary
In a light guide plate and a display apparatus having the light guide plate, a light guide plate includes reflective prisms, in which at least one of the reflective prisms includes an inclined angle adjustable according to an inclined surface of a defective portion thereof and compensates for a distortion of light caused by the defective portion.