Back-light Module Indentation Non-Parallel Sidewalls Hot Spot Reduction
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Solution Overview
Problem
Conventional back-light modules for LCDs experience hot spots due to a low A/P ratio, leading to non-uniform illumination, which is costly to resolve by increasing the number of LED components.
Innovation Solution
A back-light module design featuring a light guide plate with indentations and non-parallel sidewalls for different light-emitting devices, including optical micro-structures, to manage light beams and reduce hot spots without increasing the number of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the pitch between LED components is reduced to solve hot spots, then illumination uniformity is improved, but the number of LED components increases and manufacturing cost increases
Solution Approach 1:
The patent applies local quality by creating indentations at specific locations where hot spots occur, modifying the local optical properties of the light guide plate. The indentations have non-parallel sidewalls with different angles to control light reflection and scattering locally, thereby reducing hot spots without needing to reduce the pitch between LED components across the entire board.
Solution Approach 2:
The patent introduces a new dimensional feature - the depth and angular configuration of indentations - to control light distribution. By creating three-dimensional structural modifications (indentations with non-parallel sidewalls) on the light guide plate, the patent adds a vertical and angular dimension to light control, rather than only relying on the horizontal pitch between LEDs.
2Length of moving object
If the shortest distance A is reduced to meet narrow frame design requirements, then the frame width is reduced, but hot spots appear in the effective illumination area
Solution Approach 1:
The patent applies local quality by creating indentations at specific locations where hot spots occur, modifying the local optical properties of the light guide plate. The indentations have non-parallel sidewalls with different angles to control light reflection and scattering locally, thereby reducing hot spots without needing to reduce the pitch between LED components across the entire board.
Solution Approach 2:
The patent segments the light guide plate surface by creating localized indentations rather than uniformly modifying the entire surface. This segmentation allows targeted correction of hot spot areas while maintaining the overall narrow frame design, addressing illumination non-uniformity only where needed.
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 effectively minimizes hot spots and enhances illumination uniformity by optimizing the arrangement and angles of light-emitting devices on the light guide plate, maintaining cost-effectiveness.
Implementation Method 1
a light guide plate, a plurality of first light-emitting devices, and a plurality of second light-emitting devices. The light guide plate has a top-emitting surface, a bottom surface opposite to the top-emitting surface, and a side surface connecting the top-emitting surface and the bottom surface
Implementation Method 2
The first light-incident sidewall and the second light-incident sidewalls have a plurality of optical micro-structures
Implementation Method 3
The first light-incident sidewall and the second light-incident sidewalls have a plurality of optical micro-structures
Data Source
AI summary
A back-light module including a light guide plate (LGP), first light-emitting devices, and second light-emitting devices is provided. The LGP has a top-emitting surface, a bottom surface and a side surface. The LGP has at least one indentation. The indentation has a first light-incident sidewall and a pair of second light-incident sidewalls. The second light-incident sidewalls are located on two sides of the first light-incident sidewall and adjacent to the first light-incident sidewall. Normal vectors of the second light-incident sidewalls and the first light-incident sidewall are not parallel. The first light-emitting devices are located in the indentation, and a first light beam propagating toward the first light-incident sidewall is emitted from each of the first light-emitting devices. The second light-emitting devices are located in the indentation, and a second light beam propagating toward one of the second light-incident sidewalls is emitted from each of the second light-emitting devices.