Integrated LED Lens for Backlight Luminance Uniformity
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Solution Overview
Problem
Current direct LED backlights face challenges in achieving sufficient luminance and color variability due to the spacing and heat issues of LEDs, leading to luminance and color variability problems, especially in thinner designs.
Innovation Solution
A lens with a concave light-incident surface and a light guide portion that scatters and diffuses light, combined with a light-emitting surface, is used to efficiently mix light from a light source, reducing luminance and color variability while allowing for heat dissipation through a heat flow path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If power-type LEDs are used to increase light amount, then luminance is improved, but the number and size of LEDs increase making it difficult to dispose them close to each other, causing color variability
Solution Approach 1:
Multiple LED elements (red, green, blue) are combined into a single integrated LED element that emits composite light containing multiple colors. This merging approach eliminates the need to dispose multiple separate LED elements close to each other, solving the spacing and heat issues while maintaining high luminance and color uniformity.
Solution Approach 2:
A single LED element is designed to perform multiple functions: emitting high luminance light while simultaneously providing color mixing functionality. The integrated LED element serves as both a light source and a color mixing unit, eliminating the need for separate color mixing optical members.
2Device complexity
If normal low-power LEDs are used to shorten distances among RGB elements, then device complexity is reduced, but luminance is insufficient and color variability cannot be avoided
Solution Approach 1:
Multiple low-power LED elements are merged into a single integrated LED element that provides sufficient luminance. This integration allows the use of lower power LEDs while maintaining adequate brightness levels and improving color uniformity through the internal mixing structure.
3Length of stationary object
If side-emitting-type power LEDs are used to reduce thickness, then length in vertical direction is reduced, but color variability limit is reached
Solution Approach 1:
The integrated LED element combines multiple color-emitting diodes into a single unit with internal light mixing capability. This allows the elimination of separate color mixing optical members, enabling thinner backlight designs while maintaining color uniformity and avoiding the color variability issues associated with side-emitting LEDs.
4Manufacturing precision
If multiple separate optical members are added to suppress luminance and color variability, then luminance uniformity is improved, but device complexity and thickness increase
Solution Approach 1:
The integrated LED element is designed to provide multiple functions simultaneously: high luminance emission, color mixing, and luminance uniformity control. This multi-functional design eliminates the need for separate optical members such as diffusers and reflectors, reducing device complexity and enabling thinner backlight assemblies.
Solution Approach 2:
The functions of multiple separate optical members (diffusers, reflectors, color mixing elements) are merged into a single integrated LED element structure. This consolidation achieves the same luminance uniformity and color mixing effects while significantly reducing the number of components and overall thickness.
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 effectively suppresses luminance and color variability, enhances light distribution characteristics, and reduces the thickness of the display panel, achieving improved color mixing and luminance uniformity without the need for additional optical members.
Implementation Method 1
a light guide portion and a light-emitting surface. The concave light-incident surface includes a plane portion opposed to the light source and an optical function portion that is formed on the plane portion and one of scatters and diffuses the light
Data Source
AI summary
A lens diffusing light emitted from a light source includes a concave light-incident surface, a light guide portion, and a light-emitting surface. The light-incident surface includes a plane portion opposed to the light source and an optical function portion that is formed on the plane portion and one of scatters and diffuses the light. The light emitted from the light source enters the light-incident surface. The light that has entered the light-incident surface passes through the light guide portion. The light-emitting surface emits the light passed through the light guide portion.