Light Guide Substrate Triangular Prisms Backlight Absorption
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Solution Overview
Problem
Conventional backlight modules experience a reduction in lighting quality due to absorption phenomena between the reverse prism sheet and the light guide plate, leading to decreased brightness and the formation of white haze areas.
Innovation Solution
A light guide substrate with a light exit face featuring first and second triangular prisms, a light reflection face, and light guide microstructures, which are designed to reduce absorption by directing light rays more collimated and preventing haze formation, while protecting the polycarbonate material from scratches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional light guide plate with microstructures is used, then the backlight module can provide a uniform surface light source, but absorption phenomenon occurs between the reverse prism sheet and light guide plate, decreasing lighting quality
Solution Approach 1:
The light guide substrate is segmented into two distinct types of triangular prisms (first and second triangular prisms) with different heights and orientations. This segmentation allows different regions to perform different functions: the first triangular prisms primarily guide light, while the second triangular prisms with rounded vertices reduce absorption and prevent white haze formation, thereby resolving the contradiction between providing uniform light and reducing absorption losses.
Solution Approach 2:
Different regions of the light guide substrate are given different local properties through the two types of triangular prisms. The first triangular prisms have specific height and orientation for optimal light guidance, while the second triangular prisms have reduced height and rounded vertices specifically designed to minimize absorption and prevent haze. This local differentiation allows the system to simultaneously achieve uniform illumination and reduce energy loss.
2Illumination intensity
If the light guide plate uses standard microstructures, then light can be distributed uniformly, but white haze areas form due to absorption
Solution Approach 1:
The second triangular prisms incorporate rounded vertices instead of sharp corners. This curvature modification at the prism tips reduces light scattering and absorption that would otherwise create white haze areas. The rounded geometry allows light to pass through more smoothly while maintaining the uniform brightness distribution across the display surface.
3Ease of manufacture
If the light guide substrate uses conventional structures, then manufacturing is simple, but the polycarbonate material is vulnerable to scratches
Solution Approach 1:
The triangular prism structures with rounded vertices are pre-formed during the injection molding process of the light guide substrate. This preliminary formation of protective geometric features integrates the protection function into the manufacturing process itself, rather than requiring separate post-processing steps. The rounded vertices inherently protect the polycarbonate material from scratch initiation while maintaining manufacturing efficiency.
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 the collimation of light beams and reduces absorption issues, resulting in improved brightness and prevention of white haze areas, while maintaining the integrity of the light guide substrate material.
Implementation Method 1
The first and second triangular prisms have rounded vertices extending away from the light exit face, designed to enhance collimation of light beams and reduce absorption phenomena
Implementation Method 2
The light reflection face is opposite to the light exit face in the Z-axis direction, with light guide microstructures disposed on it to redirect light
Data Source
AI summary
A light guide substrate includes first and second triangular prisms juxtaposed to each other on a light exit face thereof. Each of the first and second triangular prisms has a rounded vertex. The number of the first triangular prisms is smaller than the number of the second triangular prisms. Each first triangular prism has a first height from the light exit face. Each second triangular prisms has a second height from the light exit face. The second height is between 20 and 90 percent of the first height. A backlight module includes the aforesaid light guide substrate, a reverse prism sheet disposed on the light guide substrate, and a light emitting unit to emit light rays into the light substrate.