Backlight Assembly Light Guide Plate Prism Pattern Concave Portions
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Solution Overview
Problem
Conventional backlight assemblies for liquid crystal display devices often result in non-uniform light distribution, leading to the formation of dark and bright areas, which affects the quality of the display.
Innovation Solution
A backlight assembly is designed with a light guide plate featuring a prism pattern on its upper surface and concave portions on its lower surface, along with an optical sheet, to ensure uniform light distribution. The light guide plate includes a diffusing pattern on either its surface or the optical sheet to scatter light and prevent the formation of dark and bright areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional backlight assembly uses a simple light guide plate structure, then the device complexity is reduced, but non-uniform light distribution occurs leading to dark and bright areas
Solution Approach 1:
The light guide plate incorporates a prism pattern on its upper surface and concave portions on its lower surface, creating localized optical structures that differentially redirect and diffuse light. This local quality variation ensures uniform light distribution across the display panel by compensating for inherent non-uniformities in the light source output.
Solution Approach 2:
An optical sheet is introduced as an intermediary component between the light guide plate and the liquid crystal panel. This optical sheet acts as a mediator that further diffuses and homogenizes the light before it reaches the display panel, effectively eliminating dark and bright areas while maintaining overall system simplicity.
2Manufacturing precision
If no diffusing pattern is used, then the manufacturing precision requirements are reduced, but dark and bright areas are generated affecting display quality
Solution Approach 1:
The diffusing pattern is selectively applied to specific regions of the optical sheet or light guide plate where light non-uniformity is most pronounced. This localized approach achieves effective light diffusion and uniformity improvement without requiring high-precision manufacturing across the entire component, thereby reducing overall manufacturing precision requirements.
3Illumination intensity
If the light guide plate has complex surface patterns, then light uniformity is improved, but the ease of manufacture decreases
Solution Approach 1:
The concave portions on the lower surface of the light guide plate utilize curved geometric shapes that can be efficiently manufactured using standard molding techniques. These curved structures effectively redirect light paths to achieve uniform distribution while remaining compatible with conventional manufacturing processes, thus balancing optical performance with ease of fabrication.
Solution Approach 2:
The complex surface patterns are segmented into modular elements - the prism pattern on the upper surface and concave portions on the lower surface - that can be independently designed and manufactured. This segmentation allows each pattern element to be optimized separately and assembled into the complete light guide plate, simplifying the overall manufacturing process while maintaining the optical benefits of complex patterns.
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 prevents the generation of dark and bright areas, ensuring uniform light supply to the liquid crystal panel, thereby enhancing the display quality by optimizing light distribution and reducing light interference.
Implementation Method 1
an upper surface joined to the incident light surface and that includes a prism pattern
Implementation Method 2
A diffusing pattern is formed on one of the upper surface and the lower surface
Data Source
AI summary
Provided are a backlight assembly and a display device having the same. The backlight assembly includes a light source unit which generates light; and a light guide plate which comprises an incident light surface through which the light from the light source unit enters the light guide plate, an upper surface joined to the incident light surface and that includes a prism pattern, and a lower surface opposing the upper surface and formed with a plurality of concave portions. A diffusing pattern is formed on one of the upper surface and the lower surface.