Micro-LED Pixel Layout for Red Luminous 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 maintain high efficiency.
Innovation Solution
The display device incorporates a substrate with partitioned light emitting areas of varying sizes, including larger areas for red light emitting elements to reduce current density and enhance luminous efficiency, and a common connection electrode design to facilitate efficient voltage distribution.
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 applies different area sizes to different color light emitting elements within the same pixel. Specifically, red light emitting elements are given a larger area compared to green and blue elements, allowing each color to operate at its optimal current density for maximum luminous efficiency while maintaining overall pixel compactness.
Solution Approach 2:
The patent changes the physical parameter of area specifically for red light emitting elements. By increasing the area of red LEDs while keeping green and blue LED areas smaller, the system optimizes current density distribution across different colors, thereby improving overall luminous efficiency without proportionally increasing total pixel area.
2Measurement precision
If micro light emitting diode elements are used for high resolution, then display resolution is improved, but current density increases causing reduced luminous efficiency
Solution Approach 1:
The patent implements local quality optimization by assigning larger areas specifically to red light emitting elements within the micro-LED array. This allows red LEDs to maintain lower current density despite the overall small pixel size required for high resolution, while green and blue LEDs use smaller areas appropriate for their higher efficiency at higher current densities.
Solution Approach 2:
The patent modifies the area parameter of light emitting elements based on color-specific characteristics. By changing the area of red LEDs to be larger than green and blue LEDs in the micro-LED structure, the system resolves the conflict between high resolution (small overall size) and luminous efficiency (optimal current density).
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 achieves higher luminous efficiency and enables high-resolution color expression with reduced power consumption, suitable for applications in head-mounted displays and other devices.
Implementation Method 1
a light emitting element on the pixel electrode
Implementation Method 2
configured to emit first light, a second light emitting element in the second light emitting area and configured to emit second 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.