Back-Side Light-Condensing LED Unit for Compact High-Luminance Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing LED light-emission units face challenges in enhancing the forward beam bundle while minimizing the package height, as conventional methods require larger reflectors or lenses, which increase the package height and limit the miniaturization of LED displays.
Innovation Solution
A light-emission unit design featuring a light-emission section with a light extraction surface and a light-condensing section on the opposite side, which includes projections with sloping surfaces to reflect light emitted in non-extraction directions towards the extraction direction, enhancing forward beam bundling without increasing package height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflector or lens is enlarged to increase the bundle of outgoing beams in the frontward direction, then the forward beam bundling is improved, but the height of back of package increases
Solution Approach 1:
Instead of placing the light-condensing section in the light extraction direction (front side), the patent places it on the side opposite to the light extraction direction (back side). This inverted arrangement allows light emitted in non-extraction directions to be reflected toward the extraction direction without increasing package height, resolving the contradiction between beam bundling and compact size
Solution Approach 2:
The light-condensing section acts as an intermediary element that redirects light paths. By positioning it on the back side with the light-emission section interposed, it mediates the light distribution by reflecting oblique light toward the front, achieving beam bundling without requiring large front-side optical elements
2Length of stationary object
If a Fresnel lens or microlens array is disposed in the light extraction direction to decrease package height, then the height of back of package is reduced, but the bundle of outgoing beams in the frontward direction is insufficient
Solution Approach 1:
The patent inverts the conventional approach by placing the light-condensing section on the back side rather than the front side. This allows the use of a compact structure without sacrificing beam bundling capability, as the light redirection occurs from the opposite direction
Solution Approach 2:
The patent converts light emitted in non-extraction directions (which would normally be wasted or dispersed) into beneficial forward-directed light through reflection. This transforms potentially harmful light loss into useful beam bundling, achieving both compact size and strong forward illumination
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 design effectively increases the forward beam bundling while maintaining a compact package height, offering improved luminance and cost-effective fabrication by eliminating the need for precise alignment and large reflectors or lenses.
Implementation Method 1
the light-condensing section that is provided on side opposite the light extraction surface, with the light-emission section interposed therebetween... reflect the light emitted in a direction other than a light extraction direction toward the light extraction direction
Data Source
AI summary
A light-emission unit includes a light-emission section, a light extraction surface that extracts light outputted from the light-emission section, and a light-condensing section that is provided on side opposite the light extraction surface, with the light-emission section provided therebetween.