Curved Reflective Middle Mold for Display Backlight Uniformity
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Solution Overview
Problem
Display apparatuses with backlight units often experience dark areas around the edges due to non-uniform light reflection on the diffuser plate, affecting picture quality.
Innovation Solution
A display apparatus design featuring a middle mold with a curved reflective surface that is concave towards the diffuser plate, integrated with a reflector and diffuser plate supporter, ensures uniform light reflection from the light source to the diffuser plate, preventing dark areas and enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a planar reflector is used in the backlight unit, then the structure is simple and easy to manufacture, but non-uniform light reflection occurs causing dark areas on the screen
Solution Approach 1:
The reflector surface is designed with a specific curvature radius (R1) in the first direction and (R2) in the second direction, transforming the planar surface into a curved surface. This curvature enables uniform light reflection across the diffuser plate, preventing dark areas while maintaining manufacturing feasibility through injection molding processes.
2Adaptability or versatility
If multiple separate components are used for the middle mold, frame, and reflector, then each component can be optimized independently, but the assembly process becomes complex and component count increases
Solution Approach 1:
The middle mold, frame, and reflector are integrated into a single unified component. This merger reduces the total component count, simplifies the assembly process, and eliminates the need for multiple separate optimizations while maintaining the functional advantages of each original component through careful design of the integrated structure.
3Illumination intensity
If a curved reflective surface with specific radii is used, then uniform light reflection is achieved preventing dark areas, but the manufacturing precision requirements increase
Solution Approach 1:
Specific parameter ranges are defined for the curvature radii (R1: 5-50mm, R2: 5-50mm) to optimize the balance between light uniformity and manufacturing precision. These parameter specifications enable manufacturers to achieve the desired optical performance within standard manufacturing tolerances, avoiding excessive precision requirements while ensuring effective dark area prevention.
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 effectively prevents dark areas on the screen by uniformly reflecting light from the light source to the diffuser plate, thereby improving picture quality and simplifying assembly while reducing component count and costs.
Implementation Method 1
a middle mold provided with a curved reflective surface positioned at a lateral side of the light source
Data Source
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AI summary
A display apparatus includes a rear chassis, a light source installed in the rear chassis to emit light, a diffuser plate that diffuses light emitted from the light source, a liquid crystal panel positioned in front of the diffuser plate to display an image, a front chassis that supports the liquid crystal panel, and a middle mold coupled between the front chassis and the rear chassis to support the diffuser plate, and is provided with a curved reflective surface formed in a curved shape to reflect the light, which is emitted from the light source module, to the diffuser plate.