Optical Composite Structure Brightness Viewing Angle
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Solution Overview
Problem
Conventional backlight modules suffer from reduced overall brightness due to high haze in diffusers, which also fail to meet user needs for a narrow enough light viewing angle.
Innovation Solution
An optical composite structure comprising a first, second, and third prism sheet, where the third prism sheet has a higher haze than the second, combined with a light source assembly to enhance brightness and viewing angle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a lower diffuser with relatively greater haze is used to evenly disperse light, then light uniformity is improved, but overall brightness of the backlight module is reduced
Solution Approach 1:
The patent divides the optical composite structure into three separate prism sheets (first, second, and third prism sheets) with different haze values, replacing the conventional single diffuser layer. Each prism sheet has specific haze characteristics that contribute to different aspects of light control, allowing independent optimization of brightness and uniformity without the trade-off present in single-layer diffusers.
Solution Approach 2:
The patent applies the local quality principle by assigning different haze values to different prism sheets: the first prism sheet has a first haze value, the second prism sheet has a second haze value, and the third prism sheet has a third haze value. This allows each layer to perform its specific function optimally - some layers prioritize brightness transmission while others focus on light scattering and uniformity.
2Ease of manufacture
If conventional prism sheets are used, then manufacturing simplicity is maintained, but viewing angle control is insufficient to meet user needs
Solution Approach 1:
The patent segments the viewing angle control function across three separate prism sheets, each with different orientation and haze characteristics. This segmentation allows precise control of light distribution in different directions while maintaining a relatively simple manufacturing process that builds upon conventional prism sheet technology.
Solution Approach 2:
The patent uses a composite structure of three prism sheets with different optical properties (different haze values and orientations) to achieve superior viewing angle control. This composite approach combines the advantages of multiple materials/layers to create a system that provides both manufacturing feasibility and advanced optical performance.
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 optical composite structure increases average brightness by 1.6 to 1.7 times and narrows the viewing angle, improving overall optical quality and assembly yield while reducing assembly damage.
Implementation Method 1
a prism layer which is stacked on the haze layer and has the first light exit surface
Implementation Method 2
a haze layer having the second light incident surface and a prism layer which is stacked on the haze layer
Data Source
AI summary
An optical composite structure includes first, second and third prism sheets. The first prism sheet has a first light incident surface and a first light exit surface opposite to each other. The second prism sheet has a second light incident surface facing the first light exit surface and a second light exit surface opposite to the second light incident surface, and includes a haze layer having the second light incident surface and a prism layer which is stacked on the haze layer and which has the second light exit surface. The third prism sheet has a third light incident surface facing the second light exit surface, and includes a haze layer and a prism layer stacked on the haze layer of the third prism sheet. The haze layer of the third prism sheet has a haze greater than a haze of the haze layer of the second prism sheet.