Diffusion Lens Curvature for Uniform Direct Backlight Luminance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Direct type backlight panels with point light sources like LEDs experience luminance unevenness due to light bounce phenomena, leading to suboptimal image quality and increased manufacturing costs from additional light emitting elements required for compensation.
Innovation Solution
A diffusion lens with a concave first surface and convex second surface, featuring side and bottom surfaces with irregular or regular patterns to diffuse light, ensuring uniform light distribution without inflection points, thus reducing the need for additional light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If point light sources (LEDs) are used as light emitting elements to ensure high luminance, then luminance intensity is improved, but luminance uniformity deteriorates due to light bounce phenomenon
Solution Approach 1:
The diffusion lens employs a concave first lens surface and a convex second lens surface with specifically designed curvatures. The curved surfaces refract light from point LED sources to distribute it uniformly across the diffusion plate, eliminating the light bounce phenomenon that causes luminance unevenness while maintaining high luminance intensity.
Solution Approach 2:
The patent optimizes optical parameters including the curvature radii of the first and second lens surfaces, the thickness of the diffusion lens, and the refractive index to achieve uniform light distribution. By carefully controlling these parameters, the lens transforms concentrated light from point sources into uniformly distributed light without requiring additional light emitting elements.
2Manufacturing precision
If additional light emitting elements are installed to compensate for luminance unevenness, then luminance uniformity is improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts the light redistribution function from the system architecture by implementing it within a single diffusion lens component. This eliminates the need for additional light emitting elements, reducing component count, assembly complexity, and manufacturing costs while achieving uniform luminance distribution.
Solution Approach 2:
The diffusion lens performs multiple functions simultaneously: it refracts light to achieve uniform distribution, maintains high luminance intensity, and eliminates the need for additional compensation elements. This multi-functionality reduces overall system complexity and manufacturing cost.
3Manufacturing precision
If complex patterns are formed on side and bottom surfaces to diffuse light, then luminance uniformity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent forms regular curved patterns (concave first surface and convex second surface) rather than irregular complex patterns. These smooth curved surfaces are easier to manufacture using conventional molding techniques while still achieving effective light diffusion and uniform luminance distribution.
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 diffusion lens achieves high production yield and assembly tolerance, maintaining luminance uniformity across the diffusion plate with fewer light emitting elements, thereby reducing manufacturing costs and enhancing image quality.
Implementation Method 1
a first lens surface having a concave curved shape such that light generated from a light source is incident on the first lens surface, a second lens surface having a convex curved shape such that part of the light incident on the first lens surface is output from the second lens surface
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A diffusion lens includes a first lens surface having a concave curved shape such that light generated from a light source is incident on the first lens surface, a second lens surface having a convex curved shape such that part of the light incident on the first lens surface is output from the second lens surface, a side surface extending from a periphery of the second lens surface in a vertical direction of the diffusion lens such that part of the rest of the light incident on the first lens surface is output from the side surface, and a bottom surface extending from a periphery of the first lens surface in a horizontal direction of the diffusion lens to meet a periphery of the side surface. Rates of change of the first lens surface and the second lens surface have the same sign, and a pattern in which arbitrary shapes are irregularly disposed or a pattern in which specified shapes are regularly or irregularly disposed is formed on the side surface and the bottom surface to diffuse the light passing through the side surface and diffuse the light reflected by the bottom surface. Besides, it may be permissible to prepare various other embodiments speculated through the specification.