LED Trench Structure for Side-Light Extraction in Displays
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Solution Overview
Problem
Existing light emitting diode (LED) display apparatuses face challenges in efficiently extracting light due to lateral light diffusion from the sides of the light emitting layer, limiting hole-electron recombination paths, and reducing emission efficiency.
Innovation Solution
The LED display apparatus incorporates a trench structure between emission and non-emission areas to reflect side light emitted from the light emitting layer in the display direction, enhancing light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a general light emitting diode structure is used, then the device is simple and easy to manufacture, but light extraction efficiency is reduced due to lateral light diffusion and limited hole-electron recombination paths
Solution Approach 1:
The light emitting diode is divided into multiple segments including a first emission area, first non-emission area, second emission area, and second non-emission area. The non-emission areas act as separate functional zones that redirect lateral light, while emission areas generate light. This segmentation allows lateral light from one emission area to be redirected by an adjacent non-emission area, improving overall light extraction efficiency without complicating the manufacturing process
Solution Approach 2:
Different areas of the light emitting diode are assigned different functional qualities: emission areas are optimized for light generation while non-emission areas are optimized for light redirection. This local differentiation allows each zone to perform its specific function efficiently, with non-emission areas specifically designed to redirect lateral light toward the display direction, thereby improving light extraction efficiency
2Loss of energy
If the light emitting diode structure is modified to improve light extraction efficiency, then light extraction efficiency increases, but device complexity increases
Solution Approach 1:
The patent merges light emission and light redirection functions into a single integrated device structure. The non-emission areas are not separate components but are integrated zones within the light emitting diode itself that perform redirection. This merging approach improves light extraction efficiency while avoiding the complexity of adding separate external redirection components
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 trench structure enhances light extraction efficiency and power consumption efficiency by reflecting side light in the display direction, improving overall LED performance.
Implementation Method 1
the trench part is configured such that a side light emitted from the emitting layer in the emission area is reflected in a display direction of the light emitting diode display apparatus
Data Source
AI summary
A light emitting diode display apparatus includes a display substrate having a plurality of subpixel areas; and a light emitting diode disposed on the display substrate to correspond to a corresponding subpixel area of the plurality of subpixel areas, wherein the light emitting diode includes an emission area and a non-emission area adjacent to the emission area, wherein the light emitting diode includes a trench part provided to overlap a boundary between the emission area and the non-emission area, and wherein the trench part is configured such that a side light emitted from the emission area is reflected in a display direction of the light emitting diode display apparatus.