Back Cover Reflection Surface Curvature for LCD Light Uniformity
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Solution Overview
Problem
Current backlight sources for LCDs rely on high-cost light guide plates, which are prone to defects, and require low power consumption, high brightness, and slimness, making them costly and inefficient.
Innovation Solution
A back cover with a reflection surface featuring concave arc-shaped regions of varying curvatures and central angles is used to replace the light guide plate, ensuring uniform light distribution to the display panel, reducing manufacturing costs and eliminating defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light guide plate is used to uniformly guide light, then light uniformity is improved, but manufacturing cost increases and defects occur more frequently
Solution Approach 1:
The invention extracts and removes the light guide plate component from the backlight system, replacing it with a reflection plate that has specific reflection structures directly formed on the back cover. This eliminates the need for the separate light guide plate while maintaining light uniformity through the reflection structures.
Solution Approach 2:
The back cover is given multiple functions: it serves as both the structural housing and the light reflection surface. By forming reflection structures directly on the back cover, the system combines the functions of the back cover and reflection plate into a single component, reducing part count and manufacturing complexity.
2Illumination intensity
If a light guide plate is used to guide light, then light distribution is improved, but device complexity and defect occurrence increase
Solution Approach 1:
The invention merges the back cover and reflection plate into a single integrated structure. The reflection structures are formed directly on the back cover surface, combining what were previously separate components into one, thereby reducing device complexity and potential defect points.
Solution Approach 2:
Instead of using a light guide plate to actively guide and redirect light through refraction and total internal reflection, the invention inverts the approach by using a reflection plate with concave arc-shaped structures that passively reflect light onto the back cover, achieving uniform light distribution through a simpler mechanism.
3Ease of manufacture
If conventional reflection surfaces are used, then manufacturing is simpler, but light uniformity and brightness are insufficient
Solution Approach 1:
The invention introduces concave arc-shaped reflection structures with specific curvature radii on the reflection plate. These curved surfaces are positioned at different locations with different curvature radii to optimize light reflection angles and achieve uniform light distribution across the back cover, improving brightness uniformity while maintaining manufacturability.
Solution Approach 2:
The reflection plate features locally optimized reflection structures with different curvature radii at different positions. The first, second, and third reflection regions each have specific concave arc-shaped structures with tailored curvature radii to address local light distribution requirements, achieving overall uniformity through local optimization.
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 back cover effectively distributes light uniformly, reducing manufacturing costs and improving the brightness and efficiency of the backlight source, achieving high brightness uniformity and reducing the need for a light guide plate.
Implementation Method 1
a reflection surface, which includes a plurality of concave arc-shaped regions, reflects light to the display panel
Data Source
AI summary
The present invention provides a back cover for a backlight source, a backlight source and a display apparatus. The back cover includes at least one reflection surface arranged on one surface of the back cover. The reflection surface includes a first reflection region and a second reflection region, each of which includes a plurality of concave arc-shaped regions. The concave arc-shaped regions of the first reflection region have curvature increasing toward the second reflection region, and the concave arc-shaped regions of the second reflection region have curvatures decreasing in a direction away from the first reflection region. The concave arc-shaped region having a maximum curvature in the first reflection region is connected with the concave arc-shaped region having a maximum curvature in the second reflection region.