Light Guide Member V-Grooves for Uniform Luminance
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Solution Overview
Problem
Conventional light guide members in backlight units fail to provide uniformly distributed light, leading to non-uniform luminance and image quality issues in display devices, and the addition of optical sheets to address this problem increases cost, weight, and size.
Innovation Solution
A light guide member with V-shaped or triangular-shaped grooves and projections is employed, which concentrates light and reduces spreading, ensuring uniform luminance distribution by adjusting exit angles and pitch, and incorporating dot-like patterns near the light source to eliminate bright lines or areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light guide members are used, then the structure is simple, but the luminance distribution is non-uniform with bright lines and dark areas
Solution Approach 1:
The light guide member incorporates V-shaped or triangular-shaped grooves at specific locations (portions not overlapping with light sources) to locally modify light diffusion characteristics. This local structural modification creates additional light extraction points that compensate for dark areas and reduce bright lines, achieving uniform luminance distribution without complicating the overall device structure
Solution Approach 2:
The light guide member is divided into multiple portions with different structures: portions overlapping with light sources maintain a flat upper surface for efficient light coupling, while portions not overlapping with light sources incorporate V-shaped or triangular grooves for enhanced light diffusion. This segmentation allows each portion to perform its specific function optimally, resolving the luminance uniformity issue
2Illumination intensity
If additional optical sheets are added to improve luminance uniformity, then the luminance distribution improves, but the cost, weight, and size increase
Solution Approach 1:
The light guide member integrates multiple functions into a single component: light guiding, light diffusion, and luminance uniformity control. The V-shaped or triangular grooves are directly formed on the light guide member itself, eliminating the need for separate optical sheets and reducing the overall weight of the backlight unit
Solution Approach 2:
The light guide member serves multiple purposes: it guides light from the light source, diffuses light to cover the display area, and the V-shaped or triangular grooves provide additional light extraction functionality. This multi-functionality replaces what would traditionally require multiple separate optical components, reducing weight and cost
3Illumination intensity
If additional optical sheets are added to improve luminance uniformity, then the luminance distribution improves, but the size increases
Solution Approach 1:
The light guide member integrates multiple functions into a single component: light guiding, light diffusion, and luminance uniformity control. The V-shaped or triangular grooves are directly formed on the light guide member itself, eliminating the need for separate optical sheets and reducing the overall volume of the backlight unit
Solution Approach 2:
Instead of adding optical sheets in the vertical dimension (increasing thickness), the invention modifies the light guide member in the horizontal dimension by incorporating V-shaped or triangular grooves on its upper surface. This approach achieves luminance uniformity without increasing the backlight unit's overall size
4Illumination intensity
If light is guided at larger radiation angles, then more light reaches distant portions, but the light intensity decreases and diffusion is weak
Solution Approach 1:
V-shaped or triangular grooves are strategically placed on portions of the light guide member that are not overlapping with light sources. These grooves create localized light extraction points that compensate for the natural attenuation of light intensity over distance, ensuring uniform luminance distribution along the entire length of the light guide member
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 improved uniformity in light distribution, reducing the bright line/area effect and enhancing image quality without the need for additional optical sheets, thus reducing cost and size while maintaining performance.
Implementation Method 1
A light guide member with V-shaped or triangular-shaped grooves and projections is employed, which concentrates light and reduces spreading, ensuring uniform luminance distribution by adjusting exit angles and pitch
Implementation Method 2
incorporating dot-like patterns near the light source to eliminate bright lines or areas
Data Source
Figure 1A~1C
Figure 2A~2C
Figure 3A~3C
AI summary
A light guide member (100) for guiding light may include a first pattern on a first side (101) of the light guide member (100), the first pattern may include a plurality of first features (110) extending along a first direction, and a plurality of second features (120) extending along a second direction, wherein the first direction crosses the second direction, the first feature (110) has a first feature size, the second feature (120) has a second feature size, and the first feature size may be less than the second feature size.