Rounded Light Guide Plate Edges for Uniform Backlight Illumination
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Solution Overview
Problem
Edge-type backlight assemblies for LCDs face issues with non-uniform light distribution, leading to shadows and brightness inconsistencies, which degrade image quality and make it difficult to display images in dark environments.
Innovation Solution
Incorporating rounded portions at the edges of the light guide plate in the backlight assembly to scatter light uniformly, ensuring that light from the lamp is evenly distributed across the liquid crystal panel, thereby eliminating shadows and bright/dark bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a straight-edge light guide plate is used in edge-type backlight assembly, then the structure is simple and manufacturing is easy, but non-uniform light distribution occurs causing shadows and brightness inconsistencies
Solution Approach 1:
The patent applies curvature by rounding the edges of the light guide plate instead of using straight edges. This curvature modification causes light to scatter more uniformly across the plate, eliminating the shadow and brightness inconsistency problems while maintaining manufacturing simplicity. The rounded edges redirect light paths to achieve uniform illumination across the entire display area.
2Use of energy by moving object
If edge-type backlight assembly is used, then power consumption is reduced compared to direct-type, but light distribution uniformity deteriorates causing image quality degradation
Solution Approach 1:
The curved edge design of the light guide plate optimizes light scattering in the edge-type backlight assembly, ensuring uniform brightness distribution across the display while maintaining the low power consumption advantage of edge-type configurations.
3Illumination intensity
If rounded portions are added to light guide plate edges, then light distribution uniformity is improved eliminating shadows and banding, but device complexity increases
Solution Approach 1:
The patent implements rounded portions at the edges of the light guide plate to improve light distribution uniformity. This curvature modification eliminates shadows and banding effects while adding minimal structural complexity, as the rounding can be integrated into the existing light guide plate manufacturing process.
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 uniform brightness and improved image quality by ensuring consistent light distribution, eliminating shadows and banding issues, and enhancing the overall display performance of LCDs.
Implementation Method 1
Incorporating rounded portions at the edges of the light guide plate in the backlight assembly to scatter light uniformly
Data Source
AI summary
A backlight assembly is suitable for emitting uniform flat light. The backlight assembly causes light from a lamp to travel in the form of flat light using a light guide plate disposed to have one plane facing the lamp. The light guide plate includes one or more rounded portions at one or more edges of an incident plane thereof onto which the light from the lamp is incident, and the one or more rounded portions cause the light from the lamp to travel into the light guide plate.