Inverted-Pyramid Diffusion Sheet Recess Angles for Uniform Luminance
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Solution Overview
Problem
Traditional light diffusion sheets in liquid crystal displays fail to achieve sufficient luminance uniformity.
Innovation Solution
A light diffusion sheet with recesses having a substantially inverted quadrangular pyramid shape arranged in a two-dimensional matrix, with an intersecting angle between the recess and light source arrangement direction of 30° to 60°, enhancing light intensity in diagonal directions where luminance is typically low.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional light diffusion sheets with inverted pyramid recesses are used, then light diffusion is achieved, but luminance uniformity is insufficient
Solution Approach 1:
The patent changes the arrangement angle parameter of the recesses relative to the light source direction. By setting the intersecting angle between the recess arrangement direction and light source arrangement direction to 30°-60°, the light diffusion characteristics are optimized to achieve both uniform luminance and reliable diffusion performance
Solution Approach 2:
The patent creates local variation in the recess structure by arranging them at specific angles (30°-60°) relative to the light source direction. This local angular arrangement optimizes the light scattering properties in different directions, particularly enhancing diagonal direction light intensity where luminance is typically lowest
2Area of stationary object
If light sources are arranged in a two-dimensional matrix, then coverage is improved, but luminance uniformity in diagonal directions decreases
Solution Approach 1:
The patent introduces asymmetric angular arrangement of the recesses (30°-60° relative to light source direction) to compensate for the symmetric two-dimensional matrix light source arrangement. This asymmetric recess orientation creates complementary light scattering patterns that fill the luminance deficiencies in diagonal directions while maintaining overall coverage
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
Improves luminance uniformity by increasing light intensity in diagonal directions, leading to enhanced display quality.
Implementation Method 1
a light diffusion sheet having surfaces, on at least one of which a plurality of recesses having a substantially inverted quadrangular pyramid shape are arranged in a two-dimensional matrix
Implementation Method 2
diffuse light emitted from a light source such as a light emitting diode (LED) to improve uniformity of luminance and chromaticity over the entire screen
Data Source
AI summary
A light diffusion sheet is incorporated in a backlight unit using a plurality of light sources arranged in a two-dimensional matrix. The light diffusion sheet has surfaces, on at least one of which a plurality of recesses having a substantially inverted quadrangular pyramid shape are arranged in a two-dimensional matrix. An intersecting angle between an arrangement direction of the plurality of recesses and an arrangement direction of the plurality of light sources is 30° or more and 60° or less.