Luminance-Equalizing Sheet Through-Hole Patterns for Edge Illumination
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Solution Overview
Problem
Conventional image display apparatuses, such as liquid crystal televisions, suffer from luminance unevenness due to the shape of the display module, which is thinner at the edges, leading to reduced light exposure and uneven illumination, making it difficult to achieve uniform image quality across the screen.
Innovation Solution
The implementation of a luminance-equalizing sheet with strategically arranged through holes of varying sizes and patterns to adjust light transmittance, combined with a diffuser panel and reflective sheet, ensures uniform light distribution and reduces luminance unevenness by optimizing light transmission and reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the display module is made thinner at the edges to achieve a thinner overall profile, then the aesthetic appearance and space-saving design are improved, but luminance uniformity deteriorates due to reduced light exposure at peripheral blocks
Solution Approach 1:
The patent applies different through-hole patterns to different regions of the luminance-equalizing sheet. Outer blocks (peripheral regions) have through-hole patterns that allow more light transmission, while inner blocks (central regions) have different patterns. This local differentiation compensates for the reduced light exposure at edges caused by the thinner display module profile, thereby maintaining luminance uniformity across the screen.
Solution Approach 2:
The patent changes the optical parameters (through-hole size, shape, and distribution) of the luminance-equalizing sheet to compensate for the non-uniform light distribution caused by the varying thickness profile. By adjusting these parameters in different regions, the system achieves uniform luminance output despite the asymmetric physical structure.
2Device complexity
If a direct-lit backlight system is used to simplify the lighting structure, then device complexity is reduced, but luminance unevenness occurs at the ends of the display panel due to insufficient light from outermost light sources
Solution Approach 1:
The luminance-equalizing sheet acts as an intermediary component between the direct-lit backlight and the display panel. It receives non-uniform light from the LED sources and redistributes it through strategically designed through-hole patterns, converting the asymmetric light distribution into uniform luminance across the screen while maintaining the simplicity of the direct-lit backlight structure.
Solution Approach 2:
The through-hole patterns in the luminance-equalizing sheet are designed with local quality variations - outer blocks have patterns optimized for edge illumination, while inner blocks have patterns for central illumination. This allows the simple direct-lit backlight to achieve uniform luminance output without requiring complex light guiding structures.
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 configuration effectively enhances luminance uniformity across the screen, reducing the visual impact of edge thinness and improving overall image quality by smoothing light distribution characteristics.
Implementation Method 1
a luminance-equalizing sheet with strategically arranged through holes of varying sizes and patterns to adjust light transmittance
Implementation Method 2
combined with a diffuser panel and reflective sheet, ensures uniform light distribution
Implementation Method 3
combined with a diffuser panel and reflective sheet, ensures uniform light distribution
Implementation Method 4
combined with a diffuser panel and reflective sheet, ensures uniform light distribution and reduces luminance unevenness by optimizing light transmission and reflection
Data Source
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AI summary
An image display apparatus (10) includes: a display panel (102); a back frame (111) that includes a flat portion (111A) having a substantially flat surface; light sources (113) that are spaced substantially evenly apart in the flat portion (111A); and a luminance-equalizing sheet (107) that is supported at a distance from the light sources (113) by support pins (112). The luminance-equalizing sheet (107) includes through holes that transmit light from the light sources (113) toward the display panel (102). The through holes are arranged in a predetermined pattern that is applied to blocks that are arranged in an array in the luminance-equalizing sheet (107) and each of which faces a different one of the light sources (113). The predetermined pattern includes a first pattern and a second pattern, the first pattern being applied to at least some of outer blocks, among the blocks, that are in contact with a periphery of the array, the second pattern being different from the first pattern and applied to at least some of the blocks to which the first pattern is not applied.