Backlight Assembly Curved Diffusion Edges Uniform Luminance
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Solution Overview
Problem
Conventional backlight assemblies using light emitting diodes as point light sources face irregular luminance due to the mismatch between the optical properties developed for line light sources, leading to suboptimal display quality.
Innovation Solution
A backlight assembly incorporating a first optical member with a diffusion member featuring inclined surfaces and curved edges, which effectively diffuses light from point light sources, reducing the distance between the optical member and light sources to minimize volume and ensure uniform light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional optical sheets designed for line light sources are used with point light sources (LEDs), then the backlight assembly structure can be simplified, but the luminance uniformity deteriorates
Solution Approach 1:
The patent applies local quality by designing the diffusion member with different surface characteristics in different regions. The incident surface has a first diffusion member with specific curvature radius (R1) while the exit surface has a second diffusion member with different curvature radius (R2), where R1 ≠ R2. This allows each surface to be optimized for its specific function: the incident surface effectively receives point light sources, and the exit surface provides uniform light distribution, thereby resolving the contradiction between structural simplicity and luminance uniformity.
Solution Approach 2:
The patent utilizes parameter changes by varying the curvature radius of the diffusion members on different surfaces. The first diffusion member has a curvature radius R1 and the second diffusion member has a curvature radius R2, with specific relationships between these parameters (e.g., 0.5 < R2/R1 < 2.0). By changing these geometric parameters, the optical path of light from point sources is controlled to achieve uniform luminance while maintaining a simplified backlight assembly structure.
2Illumination intensity
If the distance between the optical member and light sources is increased to improve light diffusion, then the luminance uniformity improves, but the volume of the backlight assembly increases
Solution Approach 1:
The patent applies spheroidality by designing both the incident surface and exit surface of the diffusion member with curved surfaces having specific curvature radii. The first diffusion member has curvature radius R1 and the second diffusion member has curvature radius R2. These curved surfaces effectively diffuse light from point sources in a compact configuration, achieving uniform luminance without increasing the distance between the optical member and light sources, thus preventing backlight assembly volume increase.
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 provides substantially uniform light to the display panel, enhancing image display quality by reducing luminance differences and minimizing the thickness of the backlight assembly.
Implementation Method 1
The first diffusion member includes a plurality of inclined surfaces that meet at a vertex, and the edges of the inclined surfaces extend between the exit surface and the vertex spaced apart form the exit surface and have curved shape
Data Source
AI summary
A backlight assembly includes a light source generating light and a first optical member diffusing the light. The first optical member includes a first diffusion member provided on an exit surface of the first optical member, from which the light exits, to diffuse the light. The first diffusion member includes a plurality of edges each having a curved shape and extending between the exit surface and a vertex of the first diffusion member. Accordingly, the light exiting through the exit surface is effectively diffused by the edges of the first diffusion member.