Curved-Surface Backlight Source for Uniform Illumination
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Solution Overview
Problem
Conventional planar backlight sources fail to provide uniform illumination for curved-surface liquid crystal display panels, resulting in low light energy utilization and luminance uniformity.
Innovation Solution
A curved-surface backlight source is designed with a frame, optical film, and light source assemblies that match the curvature of the display panel, featuring light guiding bars with semi-elliptical cross-section light emergent areas and semi-circular cross-section reflecting areas, equipped with LEDs or laser light sources, and incorporating light scattering particles and diffusion structures to enhance light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional planar backlight source is used to illuminate a curved-surface liquid crystal display panel, then the backlight source structure is simple and easy to manufacture, but the luminance uniformity deteriorates and light energy utilization rate decreases
Solution Approach 1:
The patent applies curvature to the backlight source by making the light guiding bars have an arc shape that matches the curvature of the curved-surface liquid crystal display panel. The light emergent surface is formed as an arc surface, and light scattering particles are arranged along the arc direction, enabling the backlight source to conform to the panel's curved geometry and achieve uniform illumination across the display surface.
2Device complexity
If a conventional planar backlight source is used to illuminate a curved-surface liquid crystal display panel, then the backlight source structure is simple, but the light energy utilization rate deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the cross-sectional shapes of light guiding bars at different locations. Bars closer to the center of curvature have smaller cross-sectional dimensions, while those farther away have larger dimensions. This non-uniform design compensates for the varying light path lengths and angles, optimizing light extraction efficiency across the entire curved surface and improving overall light energy utilization.
3Device complexity
If light rays having a planar distribution are emitted from the backlight source, then the backlight source is simple in structure, but the uniformity of the curved-surface display deteriorates
Solution Approach 1:
The patent transforms the planar light distribution into a curved distribution by making the light guiding bars arc-shaped. The light emergent surface follows the curvature of the panel, and light scattering particles are positioned along arc trajectories, ensuring that light rays are distributed uniformly across the curved display surface rather than in a planar pattern.
Solution Approach 2:
The patent varies the cross-sectional dimensions of light guiding bars based on their position relative to the center of curvature. Bars at different radial positions have different sizes, which locally adjusts the light output intensity to compensate for geometric effects, thereby maintaining uniform display brightness across the curved surface.
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 ensures high luminance uniformity and increased light energy utilization by matching the backlight source's curvature with the display panel, reducing thickness and costs while improving light diffusion angles.
Implementation Method 1
light guiding bars having a bent column shape, and illuminants disposed at both ends of the light guiding bars
Implementation Method 2
the reflecting area has a semi-circular cross section
Implementation Method 3
the light emergent area is provided with light scattering particles inside or outside a light emergent surface
Implementation Method 4
a light diffusion structure is arranged in the light emergent surface of the light emergent area
Data Source
AI summary
The present disclosure provides a curved-surface backlight source and a display device comprising the curved-surface backlight source. The curved-surface backlight source comprises: a frame, an optical film and a plurality of light source assemblies; the light source assemblies are disposed on the frame, the optical film is disposed on light emergent sides of the light source assemblies, and the light source assemblies and the optical film are in a curved shape.