Arc Silicone Film Backlight Module for Full-Screen Display
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Solution Overview
Problem
The existing display devices face a challenge in reducing the width of the lower border due to the presence of the drive component, backlight, and mixed light area, which limits the development of full-screen displays, as further compression leads to a sharp decrease in backlight efficiency and the occurrence of low beam hotspot phenomena.
Innovation Solution
A backlight module with a substrate and a silicone film coated on the light emitting surface of the backlight source, where the cross-section of the silicone film is arc-shaped to diffuse light, increasing the light angle and reducing the mixing light distance, thereby reducing the thickness of the backlight module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the mixing light distance is reduced to compress the lower border, then the full-screen display is achieved, but the backlight efficiency sharply decreases and low beam hotspot phenomenon occurs
Solution Approach 1:
The patent applies curvature by designing the light guide plate with an astigmatism structure, where the refractive indices along the first and second main stress directions are different. This creates asymmetric light diffusion paths that effectively mix light over a shorter distance, enabling the lower border to be compressed to about 2mm while maintaining backlight efficiency and avoiding hotspot phenomena.
2Area of stationary object
If the mixing light distance is reduced to compress the lower border, then the full-screen display is achieved, but low beam hotspot phenomenon occurs
Solution Approach 1:
The astigmatism structure of the light guide plate creates different refractive indices along orthogonal directions, producing asymmetric light diffusion that uniformly mixes light over a short distance. This prevents low beam hotspot phenomena while enabling the lower border to be compressed to about 2mm, achieving uniform light distribution across the full-screen display.
3Length of moving object
If the backlight source thickness is reduced to improve flexibility, then the flexible display performance is improved, but the light mixing distance becomes insufficient causing hotspot issues
Solution Approach 1:
The patent designs the light guide plate with astigmatism structure, creating asymmetric light diffusion paths that effectively mix light within a thin backlight module. The different refractive indices along principal stress directions ensure uniform light distribution even with reduced thickness, preventing hotspot phenomena while maintaining flexibility.
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
This solution allows for a more efficient mixing of light with a smaller mixing distance, reducing the thickness of the backlight module and enabling the compression of the lower border to match the top and side borders, achieving a full-screen display without hotspot issues.
Implementation Method 1
a cross-section of the silicone film along a direction substantially perpendicular to the substrate may be an arc to diffuse light emitted by the backlight source
Data Source
AI summary
A display device, a backlight module and a manufacturing method of a backlight module are provided. The backlight module may include a substrate, a backlight source arranged on the substrate, and a silicone film coated on a light emitting surface of the backlight source. A cross-section of the silicone film along a direction substantially perpendicular to the substrate is an arc to diffuse light emitted by the backlight source. By coating the surface of the backlight source with an arc silicone film, the light angle of the backlight source could be increased, so as to achieve the goal of mixing light with a smaller mixing light distance, which could reduce the thickness of backlight module.