Light Guide Plate Reflective Structures for LCD Brightness
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Solution Overview
Problem
Conventional light guide plates in LCDs require multiple optical films to achieve desired brightness and viewing angles, increasing material and assembly costs without effectively addressing light uniformity and efficiency.
Innovation Solution
A light guide plate design featuring a main reflective structure and an auxiliary reflective structure with specific inclined surfaces and height differences, along with controlled intervals and widths, to optimize light emission and reduce light leakage, thereby enhancing brightness and utilization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple optical films are used to achieve desired brightness and viewing angles, then the LCD can have required brightness, but the material and assembly costs increase
Solution Approach 1:
The patent combines multiple optical functions (light reflection, diffusion, and viewing angle control) into a single integrated light guide plate structure. The reflective structures with specific geometric configurations perform multiple optical functions simultaneously, eliminating the need for separate optical films and reducing overall device complexity while maintaining required brightness levels
Solution Approach 2:
The light guide plate is designed to perform multiple functions: it guides light from the edge, reflects light at controlled angles through geometric structures, diffuses light for uniformity, and controls viewing angles - all within a single component. This multi-functional design replaces what would traditionally require multiple specialized optical films
2Ease of manufacture
If conventional light guide plate structures are used, then manufacturing is simpler, but light distribution uniformity and efficiency are insufficient
Solution Approach 1:
The light guide plate incorporates reflective structures with locally varied geometric configurations - including different inclined surface angles, curvature radii, and spacing distributions - to optimize light reflection and diffusion at different locations. This local variation in structure quality achieves superior light distribution uniformity while remaining compatible with conventional manufacturing processes
3Ease of manufacture
If the interval between reflective structures is increased, then manufacturing is easier, but light leakage increases and utilization efficiency decreases
Solution Approach 1:
The patent optimizes the interval parameter between adjacent reflective structures to a specific range that balances manufacturing ease with light control performance. By carefully selecting and controlling this geometric parameter, the design achieves sufficient light reflection efficiency and minimizes light leakage while maintaining manufacturability through standard 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 design improves light distribution and reduces light leakage, increasing the utilization efficiency of the light source and potentially reducing the need for additional optical films, thus lowering costs and enhancing LCD brightness.
Implementation Method 1
a main reflective structure and an auxiliary reflective structure... to optimize light emission and reduce light leakage
Data Source
AI summary
A light guide plate includes an incident face, a bottom surface, a main reflective structure and an auxiliary reflective structure. The bottom surface is connected to the incident face. The main reflective structure is disposed on the bottom surface and has a first and a second inclined surface. The auxiliary reflective structure is disposed on the bottom surface and has a third and a fourth inclined surface. The auxiliary reflective structure and the main reflective structure have an interval therebetween, in which the interval ranges between 0.2 micrometer and 0.5 micrometer, and a bottom width of the auxiliary reflective structure on the bottom surface is smaller than a bottom width of the main reflective structure on the bottom surface. A liquid crystal display is also disclosed herein.