Optical Sheet Protrusions Brightness View Angle Trade-off
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Solution Overview
Problem
Current optical sheets for LCD devices face challenges in achieving desirable brightness and view angle characteristics, as existing designs struggle to optimize light distribution and efficiency effectively.
Innovation Solution
The proposed optical sheet features a body with protrusions and convex portions, where the convex portions can increase in thickness from the edge to the center, improving light concentration and diffusion efficiency, and can be arranged in various patterns on the surface of the protrusions to enhance light propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional prism sheets are used to condense light, then brightness is improved, but view angle characteristics deteriorate
Solution Approach 1:
The optical sheet is segmented into multiple functional regions: flat portions for light diffusion and棱镜 portions for light condensation. Each region performs a specific optical function, allowing the sheet to simultaneously achieve broad view angles from flat portions and enhanced brightness from棱镜 portions, resolving the contradiction between brightness and view angle characteristics.
Solution Approach 2:
Different regions of the optical sheet have different local optical properties. The flat portions provide omnidirectional light diffusion for wide view angles, while the棱镜 portions provide directional light condensation for brightness enhancement. This local differentiation allows the sheet to optimize both brightness and view angle characteristics in different areas simultaneously.
2Adaptability or versatility
If diffusion sheets are used to spread light, then view angle characteristics are improved, but brightness is reduced
Solution Approach 1:
The optical sheet combines diffusion functionality in flat portions with condensation functionality in棱镜 portions. The segmented design allows light to be diffused broadly across the viewing area while simultaneously being condensed in specific directions to maintain brightness, resolving the contradiction between view angle and brightness.
Solution Approach 2:
The optical sheet merges the functions of separate diffusion sheets and prism sheets into a single integrated structure. The flat portions perform diffusion while the棱镜 portions perform condensation, combining both functions in one component to achieve both wide view angles and high brightness simultaneously.
3Illumination intensity
If multiple optical sheets are stacked to enhance optical performance, then brightness and view angle are improved, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple separate optical sheets (diffusion sheet and prism sheet) into a single integrated optical sheet with both flat and棱镜 portions. This consolidation maintains the optical performance benefits of stacked sheets while reducing device complexity by eliminating the need for multiple separate components and their associated alignment and assembly requirements.
Solution Approach 2:
The single optical sheet performs multiple optical functions simultaneously: diffusion in flat portions and condensation in棱镜 portions. This multi-functionality replaces what would traditionally require multiple separate sheets, reducing device complexity while maintaining enhanced brightness and view angle characteristics.
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 significantly improves both brightness and view angle characteristics, offering better optical performance compared to traditional prism and diffusion sheets by optimizing light concentration and diffusion efficiency.
Implementation Method 1
a plurality of convex portions disposed on the protrusions, each of the convex portions having a thickness that increases from edge to center
Data Source
AI summary
Provided are embodiments of an optical sheet and a backlight assembly having the optical sheet. The optical sheet can include a body, a plurality of protrusions, and a plurality of embossed portions. The body can form a substrate. One surface of the body can be provided in a planar shape, and the other surface of the body can include the plurality of protrusions, where the protrusions have a triangular shaped cross-section. Each of the protrusions can be configured with the plurality of embossed, which may be formed by a microlens pattern.