Light Guide Plate Protrusion Ridge Structure for Defect Shielding
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Solution Overview
Problem
Backlight modules with edge-type light guide plates often suffer from non-uniformity due to local bright or dark spots caused by production defects or scratching, which cannot be effectively mitigated without degrading overall luminance, necessitating the use of additional diffusion sheets.
Innovation Solution
A light guiding structure featuring protrusion ridge portions with varying heights and vertex angles along the longitudinal direction, which disorder light paths to shield defects, eliminating the need for additional diffusion sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a lower diffusion sheet is added to mitigate bright spots or dark spots, then the uniformity of surface light source is improved, but the overall luminance is degraded
Solution Approach 1:
The light guide plate incorporates local structural variations through protrusion ridge portions with different heights and vertex angles at different positions. This local quality variation disorders light paths specifically at defect locations to mitigate bright spots and dark spots without requiring a diffusion sheet that would reduce overall luminance.
Solution Approach 2:
The invention changes the geometric parameters (height and vertex angle) of the protrusion ridge portions along the longitudinal direction to create height variation between 2% and 15%. This parameter variation disorders light paths to eliminate defects while preserving overall luminance, avoiding the need for additional diffusion sheets.
2Device complexity
If the structure of light guide plate is simplified to eliminate additional diffusion sheet, then the device complexity is reduced, but the ability to mitigate bright spots or dark spots is lost
Solution Approach 1:
The invention merges the defect-mitigation function into the light guide plate itself by incorporating protrusion ridge portions with varying heights and angles directly into its structure. This integration eliminates the need for separate diffusion sheets while maintaining the ability to mitigate bright spots and dark spots.
Solution Approach 2:
The light guide plate structure is designed to perform multiple functions: guiding light from the edge source and simultaneously mitigating defects through its varied protrusion ridge structure. This multi-functionality eliminates the need for additional components while maintaining uniformity of surface light source.
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 light guiding structure effectively mitigates bright and dark spots, maintaining high luminance and uniformity without the need for additional diffusion sheets, thereby enhancing the overall performance of the light guide plate.
Implementation Method 1
disorder light paths through the structural variations of the light guiding structure
Data Source
AI summary
A light guiding structure of a light guide plate is provided. The light guiding structure comprises a plurality of protrusion ridge portions extending along a longitudinal direction. The height or the vertex angle of each protrusion ridge portion periodically or randomly varies along the longitudinal direction.