LED Display Rib Structure for Higher Light Extraction
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Solution Overview
Problem
Existing display devices face challenges in efficiently extracting light from LEDs, leading to reduced light emission efficiency and increased power consumption.
Innovation Solution
The display device incorporates a substrate, a plurality of pixels with LEDs, a counter substrate, and at least one rib. The rib is sandwiched by the substrate and counter substrate, with a height greater than the LED, and is arranged between the LEDs to enhance light extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light-emitting diodes are used in display devices, then high visibility and reliability are achieved, but light extraction efficiency is reduced
Solution Approach 1:
The patent introduces a rib structure with height dimension extending from the substrate toward the counter substrate, creating a three-dimensional light management architecture. This vertical dimension allows light to interact with the rib structure at multiple heights, enabling enhanced extraction efficiency without compromising LED reliability.
Solution Approach 2:
The rib structure acts as an intermediary element between the LED and the counter substrate. It mediates light propagation by providing reflection surfaces and modifying light paths, thereby improving light extraction efficiency while allowing the LED to maintain its reliable operation.
2Ease of manufacture
If conventional flat structure is used between LEDs, then manufacturing is simple, but light extraction efficiency is low
Solution Approach 1:
The space between LEDs is segmented into multiple functional zones using the rib structure. The rib divides the flat region into distinct areas with different optical functions, creating a segmented architecture that enhances light extraction while remaining manufacturable through standard semiconductor fabrication processes.
Solution Approach 2:
The rib structure introduces local quality variations in the flat region between LEDs. By creating localized three-dimensional features with specific reflectivity and geometric properties, the structure enhances light extraction efficiency at critical locations without requiring complete restructuring of the entire display device.
3Loss of energy
If rib structure with height greater than LED is introduced, then light extraction efficiency is improved, but device complexity increases
Solution Approach 1:
The rib structure extends partially beyond the LED height rather than requiring complete enclosure or complex multi-layer structures. This partial extension provides sufficient light extraction enhancement while avoiding excessive structural complexity that would arise from more aggressive three-dimensional configurations.
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 rib structure effectively reflects and directs light from the LEDs towards the counter substrate, increasing the apparent light-extraction efficiency and allowing for the display of high-luminance images with reduced power consumption.
Implementation Method 1
The rib structure effectively reflects and directs light from the LEDs towards the counter substrate
Data Source
AI summary
Disclosed is a display device including a substrate, a plurality of pixels, a counter substrate, and at least one rib. The plurality of pixels is located over the substrate and each includes a light-emitting diode. The counter substrate is located over the plurality of pixels. The at least one rib is formed over the counter substrate, located over a region between the plurality of light-emitting diodes included in the plurality of pixels, and has a height larger than a height of the light-emitting diode.