Light Guide Plate with Varying Light Control Patterns
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Solution Overview
Problem
The reduction in the number of LEDs in backlight assemblies for LCDs increases the distance between light sources, leading to larger dark regions and reduced brightness due to inefficient light distribution.
Innovation Solution
A light-guide plate with an incident surface featuring varying light-control patterns of different shapes and beam angles, and a reflective surface with increasing density, is used to optimize light distribution and reduce dark regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of LEDs is reduced to decrease device complexity and manufacturing cost, then the device complexity and manufacturing cost are reduced, but the distance between LEDs increases causing larger dark regions and reduced brightness
Solution Approach 1:
The incident surface is divided into multiple regions with different light control pattern densities. The first region (central area) has a first density of light control patterns, while the second region (peripheral area) has a second density that is different from the first density. This local variation in pattern density optimizes light distribution in different areas, reducing dark regions while maintaining fewer LEDs.
Solution Approach 2:
The patent changes the parameters of light control patterns by varying their density across different regions of the incident surface. By adjusting the density parameter (number of patterns per unit area) in different regions, the light distribution is optimized to eliminate dark regions even with reduced LED count.
2Volume of moving object
If the number of LEDs is reduced to reduce product size, then the product size is reduced, but the dark region area increases and brightness decreases
Solution Approach 1:
Different regions of the incident surface are assigned different light control pattern densities to address local lighting needs. The first region has a first density and the second region has a second density, creating localized optimization that reduces dark regions without requiring additional LEDs, thus maintaining compact product size.
Solution Approach 2:
The patent introduces a spatial dimension to the solution by varying light control pattern density across different regions rather than using a uniform approach. This regional differentiation in the spatial domain allows efficient light distribution with fewer LEDs, reducing both product size and dark region area.
3Ease of manufacture
If uniform light control patterns are used across the incident surface, then the manufacturing process is simplified, but light distribution efficiency is reduced causing dark regions
Solution Approach 1:
The incident surface is divided into regions with different light control pattern densities. The first region has a first density and the second region has a second density, allowing optimized light distribution in different areas. This regional differentiation improves light distribution efficiency while maintaining relatively simple manufacturing through standardized pattern formation processes.
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 effectively minimizes dark regions and enhances light efficiency by diffusing light at specific angles, maintaining brightness and display area even with fewer LEDs.
Implementation Method 1
Light passing through the first control patterns has a first beam angle and light passing through the second control patterns has a second beam angle larger than the first beam angle
Implementation Method 2
The light-control patterns have shapes different from one another according to the regions corresponding to a position of a light source
Implementation Method 3
The backlight assembly includes a reflective surface. The reflective surface has a reflective pattern
Data Source
AI summary
A light-guide plate includes an incident surface, a emissive surface and a reflective surface. The incident surface includes a plurality of light-control patterns formed in sectioned regions of the incident surface. The light-control patterns have shapes different from one another according to the regions corresponding to a position of a light source. The emissive surface is extended from a side of the incident surface. The reflective surface is opposite to the emissive surface.