Light Guide Plate Groove Length Variation for Backlight Uniformity
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Solution Overview
Problem
Conventional side incident type backlight modules with V-grooves on light guide plates are prone to collisions and friction during assembly or transport, leading to hot spots and increased production costs due to damage and the need for additional optical films to address these issues, compromising display quality.
Innovation Solution
A light source module with a light guide plate featuring grooves or protruding patterns of varying lengths shorter than the plate itself, positioned beside the light incident surface, reduces collision and friction areas with optical films and reflectors, enhancing planar light source quality and reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If V-grooves are disposed on the entire light incident surface or bottom surface of the light guide plate, then the front emitted luminance and light source efficiency are improved, but the V-grooves may collide or cause friction with the optical film set or reflector during assembly or transport, damaging the V-grooves and forming hot spots
Solution Approach 1:
The patent applies local quality by making the V-grooves non-uniform in length rather than extending across the entire light guide plate. Specifically, the V-grooves are designed with varying lengths where grooves near the light source have greater length and depth, while grooves farther away have reduced length and depth. This localized variation optimizes light extraction where needed while reducing collision risk in other areas, thus resolving the contradiction between improving luminance and maintaining reliability.
2Illumination intensity
If V-grooves are disposed on the entire light guide plate, then the brightness performance is improved, but the production costs are increased due to the need for extra optical films to solve the hot spot issue
Solution Approach 1:
The patent reduces device complexity and production costs by eliminating the need for additional optical films through localized V-groove design. By concentrating the light extraction function in specific areas where grooves are optimally positioned and sized, the design achieves uniform brightness without creating hot spots that would require compensatory optical films, thus reducing overall device complexity and production costs.
Solution Approach 2:
The patent converts the potential harm of V-groove collisions into a benefit by strategically designing the groove distribution pattern. The non-uniform groove lengths are intentionally arranged to direct light extraction away from edge regions where collisions occur, transforming the collision risk into an opportunity to improve light distribution uniformity and eliminate hot spots without requiring additional components.
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 design improves display quality and yield by minimizing collisions and friction, providing a more uniform planar light source while decreasing production costs by reducing the need for extra optical films to address hot spots.
Implementation Method 1
By using the V-grooves to refract the light, the front emitted luminance and the light source efficiency are improved
Implementation Method 2
the light is reflected by a reflector 140 on a bottom surface 110b of the light guide plate 110
Data Source
AI summary
A light source module including a light guide plate and a light source is provided. The light guide plate has a light incident surface and a light emitting region, and the light guide plate has a plurality of grooves or protruding patterns thereon. The length of the grooves or the protruding patterns is smaller than the length of the light guide plate. The light source is disposed on the light incident surface of the light guide plate, and the grooves or the protruding patterns of the light guide plate are disposed beside the light incident surface.