Prism Sheet Variable Microstructure Density for Luminance and Viewing Angle Balance
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Solution Overview
Problem
Conventional backlight modules improve luminous intensity but restrict viewing angles, adversely affecting display apparatus performance.
Innovation Solution
A prism sheet with microstructure members having a variable distribution density, where the density is higher in the central region and lower in the side regions, allowing for increased luminance in the central area while maintaining broad viewing angles by refracting and converging light effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional backlight module uses prism plates with uniform microstructure members to improve luminous intensity, then the luminance is enhanced, but the viewing angles are restricted
Solution Approach 1:
The patent applies local quality by varying the distribution density of microstructure members across different regions of the prism sheet. The central region has a first distribution density while the side regions have a second distribution density that is lower than the first. This non-uniform distribution allows the central region to provide strong light convergence for high luminance, while the side regions maintain broader viewing angles by having fewer microstructure members that would otherwise restrict light escape.
2Illumination intensity
If the distribution density of microstructure members is increased to enhance light convergence, then luminance improves, but viewing angle performance deteriorates
Solution Approach 1:
The patent implements local quality by creating region-specific optical characteristics through different microstructure member distribution densities. The central region employs a higher density for maximum light convergence and luminance enhancement, while side regions use a lower density to preserve wide viewing angles. This spatially varying density distribution resolves the contradiction between light convergence efficiency and viewing angle performance.
Solution Approach 2:
The patent segments the prism sheet into distinct regions (central region and side regions) with different optical functions. The central region is optimized for light convergence and luminance, while side regions are optimized for viewing angle performance. This segmentation allows each region to independently optimize its function without compromising the other, effectively resolving the contradiction between luminance and viewing angle 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 design enhances luminance without sacrificing viewing angles, achieving a balance between luminance and viewing angle performance.
Implementation Method 1
a first prism plate 14 disposed on the first diffuser plate 13 and opposite to the light guide plate 12... so as to refract the light entering the first prism plate 14 to be converged in the direction perpendicular to the lateral surface 122
Data Source
AI summary
A prism sheet includes a sheet body that includes opposite light exiting and incident surfaces, and a lateral side transversely connected between the light incident and exiting surfaces. The light exiting surface includes two side regions disposed on two opposite sides of a reference line on the light exiting surface, which is perpendicular to the lateral side. The sheet body further includes a plurality of parallel microstructure members protruding from the light exiting surface and extending perpendicularly to the lateral side. The microstructure members have a distribution density decreased in a density-decreasing direction parallel to the lateral side and pointing toward either of the side regions from the reference line.