Light Guide Plate Microstructures for Backlight Luminance and Scratch Resistance
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Solution Overview
Problem
Conventional light guide plates in side-type backlight modules face challenges in reducing horizontal viewing angles while maintaining luminance and preventing scratches from contact friction with reflective sheets.
Innovation Solution
The design incorporates first and second microstructures on the light guide plate, where first microstructures protrude from the bottom surface and extend away from the light-incident surface, and second microstructures have light-adjusting blocks that control light-emitting angles, reducing horizontal viewing angles and improving luminance, while also minimizing contact area with reflective sheets to prevent scratches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If microstructures are formed on the light guide plate to guide light rays, then light-emitting efficiency and optical quality are improved, but horizontal viewing angle becomes too wide and luminance is not maintained
Solution Approach 1:
The patent applies local quality by creating different microstructure types in different regions of the light guide plate. First microstructures (protrusions) are located in a first region, while second microstructures (grooves) are located in a second region. Each microstructure type has different geometric characteristics that locally adjust light emission properties, enabling the plate to reduce horizontal viewing angle while maintaining luminance in specific directions.
Solution Approach 2:
The light guide plate is segmented into multiple functional regions with different microstructure types. The first microstructures and second microstructures are arranged in different regions, allowing independent optimization of light guidance in different areas. This segmentation enables precise control over light emission angles and luminance distribution across the display surface.
2Device complexity
If the light guide plate contacts the reflective sheet directly, then structural simplicity is maintained, but scratches occur due to contact friction
Solution Approach 1:
The patent introduces a protective film as a thin layer between the light guide plate and reflective sheet. This film acts as a protective barrier that prevents direct contact and friction between the two components, thereby preventing scratches on the reflective sheet while maintaining the overall structural simplicity of the backlight module.
Solution Approach 2:
The protective film serves as an intermediary element between the light guide plate and reflective sheet. It mediates the interaction between these two components by providing a low-friction interface that prevents direct mechanical contact, thus protecting the reflective sheet from scratches while allowing the light guide plate to maintain its structural integrity.
3Object-affected harmful factors
If dust particles are present between the light guide plate and reflective sheet, then contamination is minor, but scratches occur due to contact friction with microstructures
Solution Approach 1:
The protective film provides beforehand cushioning by creating a protective barrier before dust particles can cause damage. This film prevents dust particles from being compressed between the light guide plate and reflective sheet during assembly and operation, thereby preventing scratches that would otherwise be caused by dust particles under contact friction.
Solution Approach 2:
The protective film acts as an intermediary that isolates dust particles from the critical interface between the light guide plate and reflective sheet. By providing this intermediate layer, dust particles cannot directly contact and scratch the microstructures or the reflective sheet, even when present in the assembly environment.
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
This design effectively reduces horizontal viewing angles and maintains luminance, while preventing scratches through the strategic arrangement of microstructures and reduced contact area with reflective sheets, enhancing the optical performance and durability of the backlight module.
Implementation Method 1
The light guide plate is used to guide the light rays emitted from the point light source or the linear light source disposed beside a light-incident surface of the light guide plate to a light-emitting surface of the light guide plate
Implementation Method 2
each of the plurality of second microstructures comprises a plurality of light-adjusting blocks protruding from the bottom surface and arranged along the predetermined direction
Data Source
AI summary
A light guide plate has a light-incident surface, a bottom surface, a light-emitting surface, first microstructures and second microstructures. The bottom surface is opposite to the light-emitting surface, the light-incident surface is connected between the bottom surface and the light-emitting surface. The first microstructures protrude from the bottom surface and are arranged at intervals along a direction parallel to the light-incident surface and extend from the light-incident surface in a predetermined direction. The second microstructures are disposed between the first microstructures away from the light-incident surface, and each them includes light-adjusting blocks protruding from the bottom surface and arranged along the predetermined direction. Each first microstructure has a first height, and each light-adjusting block has a second height smaller than the first height. The light guide plate has a reduced horizontal viewing angle and a maintained luminance. A backlight module including the light guide plate is of scratch resistance.