Dual-Layer Diffusion Plate Assembly for Backlight Uniformity
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Solution Overview
Problem
Conventional liquid crystal display backlight modules require expensive brightness enhancement films to achieve uniform brightness, increasing overall costs due to the limitations of diffusion plates in addressing non-uniformity.
Innovation Solution
A diffusion plate assembly comprising a high-transmittance first diffusion plate with prism-shaped microstructures and a lower-transmittance second diffusion plate, both made from doped transparent materials, which together replace the need for a brightness enhancement film by diffusing light effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional diffusion plate is used to diffuse light, then brightness uniformity is improved, but transmittance is reduced to between 50% and 70%
Solution Approach 1:
The invention divides the single diffusion plate into two separate diffusion plates with different transmittance characteristics. The first diffusion plate has high transmittance (above 90%) and the second diffusion plate has lower transmittance (50%-90%), allowing each plate to perform its function optimally while maintaining overall system transmittance above 50%
Solution Approach 2:
The invention applies different optical properties to different parts of the system by using two diffusion plates with distinct transmittance values. The first diffusion plate uses high transmittance material for minimal light loss, while the second diffusion plate uses lower transmittance material for enhanced diffusion effect, creating local optimization of optical properties
2Illumination intensity
If diffusion particles are added to the diffusion plate to improve diffusion effect, then brightness uniformity is improved, but transmittance is reduced to between 50% and 70%
Solution Approach 1:
The invention segments the diffusion function across two plates, allowing the first plate to use minimal diffusion particles for high transmittance (above 90%) while the second plate uses more diffusion particles for lower transmittance (50%-90%), achieving both diffusion effectiveness and light efficiency
3Illumination intensity
If a brightness enhancement film is added to achieve uniform brightness, then brightness uniformity is improved, but manufacturing cost is increased
Solution Approach 1:
The invention merges the diffusion function into the diffusion plate assembly itself by using two diffusion plates with different transmittances, eliminating the need for a separate brightness enhancement film and thereby reducing manufacturing cost while maintaining brightness uniformity
Solution Approach 2:
The two diffusion plates perform multiple functions: they provide light diffusion, achieve brightness uniformity, and eliminate the need for additional brightness enhancement films, making the diffusion plate assembly a multi-functional component that reduces overall system complexity and cost
4Illumination intensity
If the thickness of the diffusion plate is increased to improve diffusion effect, then brightness uniformity is improved, but light transmittance is reduced
Solution Approach 1:
The invention segments the thickness function across two plates, allowing the first diffusion plate to be thinner for high transmittance (above 90%) and the second diffusion plate to be thicker for lower transmittance (50%-90%), achieving both diffusion effectiveness and light efficiency without requiring a single thick plate
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 diffusion plate assembly enhances light diffusion and reduces costs by eliminating the need for the brightness enhancement film, achieving similar brightness uniformity at a lower price point, potentially saving around 50% of the conventional system's cost.
Implementation Method 1
The first microstructures are prism-shaped structures. The height of the first microstructures is between 25 μm and 200 μm, and the distance between the peaks of each first microstructure is between 50 μm and 300 μm.
Implementation Method 2
since pluralities of diffusion particles are disposed in the diffusion plate 130, the transmittance of the diffusion plate 130 is lowered
Data Source
AI summary
A diffusion-plates assembly and a direct-type backlight module assembly are provided. The diffusion-plates assembly includes a first diffusion plate and a second diffusion plate. There are pluralities of first microstructures on the emergent surface of the first diffusion plate, the first microstructures is for condensing light. The thickness of the first diffusion plate is above 0.4 mm, and the transmittance of the first diffusion plate is above 90%. The second diffusion plate is placed over or under the first diffusion plate, The thickness of the second diffusion plate is above 0.4 mm, and the transmittance of the second diffusion plate is 50˜90. Said diffusion-plates assembly is used in the direct-type backlight module assembly.