Partitioned RGB Display Pixel Layout for Red LED Efficiency
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Solution Overview
Problem
Micro light emitting diode elements, particularly those emitting red light, experience decreased luminous efficiency with increasing current density, necessitating a solution to enhance efficiency without compromising performance.
Innovation Solution
The display device incorporates a substrate with partitioned light emitting areas, including a first light emitting area with a larger size than the light emitting element, and a common connection electrode partially exposed to improve luminous efficiency by reducing current density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the area of red light emitting diode element is increased to lower current density, then luminous efficiency is improved, but device area increases
Solution Approach 1:
The patent merges the red, green, and blue light emitting areas into a single integrated display device structure, allowing the red light emitting area to be enlarged for improved luminous efficiency while maintaining compact overall device dimensions through shared substrate and electrode structures
Solution Approach 2:
The patent applies different area sizes to different light emitting elements based on their specific requirements - the red light emitting area is made larger than the green and blue light emitting areas to compensate for the red LED's lower luminous efficiency at standard current densities, while maintaining appropriate sizes for the other colors
2Loss of energy
If the area of red light emitting diode element is increased to lower current density, then luminous efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the display device into distinct light emitting areas (red, green, blue) with different area sizes, allowing each color to be optimized independently for its luminous efficiency characteristics while using standardized manufacturing processes for the overall structure
Solution Approach 2:
The patent changes the physical parameter of area size specifically for the red light emitting element, making it larger than the green and blue elements, to adjust the current density and improve luminous efficiency without changing other manufacturing parameters
3Reliability
If common connection electrode is partially exposed to improve electrical connection, then electrical conductivity is improved, but device complexity increases
Solution Approach 1:
The patent extracts the common connection electrode from complete coverage and partially exposes it in specific regions to achieve reliable electrical connections where needed, while reducing unnecessary electrode material and simplifying the overall electrode structure in other regions
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 luminous efficiency by increasing the area of red light emitting areas, thereby improving the overall performance of the display device.
Implementation Method 1
a light emitting element on the pixel electrode... configured to emit first light
Data Source
AI summary
A display device includes: a substrate; a partition wall on the substrate; a plurality of light emitting areas on the substrate, the light emitting areas including a first light emitting area, a second light emitting area, and a third light emitting area partitioned by the partition wall; a first light emitting element in the first light emitting area and configured to emit first light; a second light emitting element in the second light emitting area and configured to emit second light; and a third light emitting element in the third light emitting area and configured to emit third light. An area of the first light emitting area is larger than an area of the first light emitting element and is larger than an area of the second light emitting area and an area of the third light emitting area.