Light Guide Member with Dual-Surface Grooves for Uniform Luminance
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Solution Overview
Problem
Conventional light guide members in backlight units for display devices fail to provide uniformly distributed light, leading to non-uniform luminance and image quality issues, and often require additional optical sheets that increase cost, weight, and size.
Innovation Solution
A light guide member with first grooves and projections on one side and second grooves with V-shaped cross-sections on the other side, arranged to change light distribution and enhance diffusion, using a metal layer with lower hardness to prevent damage and control groove depth, and employing only a prism sheet for optical enhancement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light guide members are used to guide light from the light source, then the light is transmitted through the light guide member, but the luminance distribution is non-uniform with bright lines and dark areas
Solution Approach 1:
The patent applies local quality by creating different surface structures at different locations on the light guide member. Specifically, a first surface has a first pattern while a second surface has a second pattern, allowing different regions to perform different optical functions - one surface primarily guides light while the other surface optimizes light extraction and diffusion, thereby achieving uniform luminance distribution across the display panel
Solution Approach 2:
The patent segments the light guide member into distinct surfaces with different patterns. The first surface and second surface are differentiated with separate patterning, enabling independent optimization of light guidance and light diffusion functions, which resolves the non-uniform luminance issue by distributing light more evenly across different regions
2Illumination intensity
If additional optical sheets are added to achieve uniform luminance distribution, then the luminance uniformity is improved, but the cost, weight, and size of the backlight unit increase
Solution Approach 1:
The patent merges multiple optical functions into a single light guide member by incorporating both light guidance and light diffusion capabilities. The first and second surfaces with their respective patterns are integrated into one component, eliminating the need for separate optical sheets and reducing overall device complexity while achieving uniform luminance distribution
Solution Approach 2:
The light guide member is designed with multi-functionality by providing both light guidance and uniform light distribution functions through its dual-surface structure. The first surface handles light guidance while the second surface manages light extraction and diffusion, allowing one component to perform multiple optical functions that previously required separate optical sheets
3Illumination intensity
If additional optical sheets are added to achieve uniform luminance distribution, then the luminance uniformity is improved, but the weight of the backlight unit increases
Solution Approach 1:
The patent combines multiple optical functions into a single light guide member, eliminating the need for additional optical sheets. This integration reduces the total material used and consequently decreases the weight of the backlight unit while maintaining uniform luminance distribution through the dual-patterned surfaces
4Illumination intensity
If additional optical sheets are added to achieve uniform luminance distribution, then the luminance uniformity is improved, but the size and thickness of the backlight unit increase
Solution Approach 1:
The patent integrates light guidance and light diffusion functions into a single light guide member with dual surfaces, eliminating the need for separate optical sheets. This consolidation reduces the overall thickness and size of the backlight unit while achieving uniform luminance distribution through the coordinated action of the first and second patterns on different surfaces
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 solution achieves a uniform luminance distribution and high brightness, reducing the need for additional optical sheets and resulting in a thinner, lighter backlight unit with improved image quality and appearance.
Implementation Method 1
a light guide member for guiding light traveling therein and providing uniformly distributed light
Implementation Method 2
The diffusion of light is also generally weak at a portion of a light guide member close to the light source
Data Source
AI summary
A light guide member for guiding light received from a light source unit, the light source unit illuminating light toward the light guide member, the light guide member may include a plurality of first grooves on a first side of the light guide member, the first grooves extending along a first direction, and a plurality of first projections projecting from surfaces of the first grooves.