Curved Light Emission Surface for LCD Backlight Collimation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current LCD technologies face challenges in achieving accurate light collimation for backlight sources, leading to reduced color saturation and energy efficiency due to the large divergence angle of incident light, which is not adequately addressed by general LED packaging techniques.
Innovation Solution
A directional light distributing optical element with a light incident surface and a light emission curved surface, featuring a central axis and intersecting first curves with multiple tangent points, is designed to receive and redirect light within specific angle ranges, ensuring efficient collimation and reducing energy wastage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If general LED packaging technique is used, then device complexity is reduced, but light collimation precision is insufficient
Solution Approach 1:
The patent employs a curved light emission surface with precisely controlled radius of curvature to achieve light collimation. The curved surface geometry is designed such that light rays from the LED source are redirected at specific angles to form a collimated beam, resolving the contradiction by using geometric curvature rather than complex optical components.
Solution Approach 2:
The patent modifies the emission characteristics by changing the geometric parameters of the light emission surface, specifically the radius of curvature and the angular distribution of emitted light. By adjusting these parameters, the system achieves precise collimation control without requiring complex optical assemblies.
2Ease of operation
If light divergence angle is large, then ease of operation is improved, but color saturation decreases due to cross-talk
Solution Approach 1:
The patent applies different emission characteristics to different regions of the light emission surface. The curved surface is designed with varying local angles that redirect light from different source positions to specific target regions, ensuring that each subpixel receives light primarily from its corresponding LED while minimizing cross-talk to adjacent subpixels.
3Use of energy by stationary object
If color filter absorption method is used, then device complexity is reduced, but energy efficiency decreases
Solution Approach 1:
The patent replaces the conventional color filter absorption mechanism with a geometric optics-based light redirection system. Instead of using absorptive color filters that waste energy, the system uses the curved light emission surface to spatially separate and direct different wavelengths to their respective subpixels, significantly improving energy efficiency by eliminating unnecessary absorption.
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 enhances light collimation, improving color saturation and energy efficiency by directing light within precise angles, effectively addressing the limitations of existing technologies and enabling more efficient backlight modules.
Implementation Method 1
The included angle formed between the first axis and the optic axis is greater than −15° and smaller than 15°, and each first tangent point satisfies (formula involving refractive indices n1 and n2)
Data Source
AI summary
The collimating optical element includes a light incident surface and a light emission curved surface. The light incident surface receives a light emitted by a light source. The light emission curved surface and a first plane are intersected to form a first curve. The first curve has a plurality of first curve segments, and each first curve segment includes at least three first tangent points. After passing each first tangent point along a connecting line of the light source and each first tangent point, the light exits along a first collimation axis, and an included angle formed between the first collimation axis and an optic axis is greater than −15° and smaller than −15°. Thus, the light after passing the collimating optical element forms a one-dimensional collimating light.