Multi-Stack Light-Emitting Structure for Thin Color Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices, particularly flexible and stretchable ones, face challenges in achieving efficient light emission across various emission areas while maintaining thinness, light weight, and low power consumption.
Innovation Solution
A display device comprising a plurality of first electrode pads corresponding to emission areas, a second electrode pad on the same layer, and a light-emitting element connected to these electrodes. The light-emitting element includes multiple stacks with semiconductor layers and active layers, and a conductor connects the n-type semiconductor layers across stacks, allowing for efficient light emission across different areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple separate light-emitting elements are used for different emission areas, then color accuracy and brightness are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent combines multiple light-emitting elements into a single integrated structure where a first light-emitting element and a second light-emitting element share common electrode pads and are formed in an integrated manner. The first light-emitting element corresponds to a first emission area and the second light-emitting element corresponds to a second emission area, allowing multiple emission functions to be achieved within one unified device structure rather than using separate independent elements.
Solution Approach 2:
The patent implements multi-functionality by designing a single light-emitting element structure that can emit light across multiple emission areas with different colors. The first active layer can emit light in the first emission area while the second active layer emits light in the second emission area, enabling one integrated device to perform multiple light emission functions simultaneously.
2Weight of moving object
If thin and lightweight materials are used to maintain flexibility, then thinness and light weight are improved, but manufacturing precision and reliability deteriorate
Solution Approach 1:
The patent segments the light-emitting element into distinct functional layers including first and second semiconductor layers, first and second active layers, and first and second electrode pads. Each layer is formed separately with specific thicknesses and compositions, allowing precise control over each segment's properties while maintaining overall device thinness and flexibility.
Solution Approach 2:
The patent applies local quality by using different materials and structures in different regions of the device. The first active layer and second active layer have different compositions optimized for their respective emission areas, and the semiconductor layers are doped with different dopants in different regions to achieve specific electrical properties locally while maintaining overall device integrity.
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 proposed solution enables efficient light emission across multiple emission areas, improving the display device's performance in terms of brightness and color accuracy while maintaining the desired thinness and low power consumption.
Implementation Method 1
a first active layer between the first n-type semiconductor layer and the first p-type semiconductor layer, a second stack overlapping the first stack in a first emission area among the emission areas, and including a second n-type semiconductor layer, a second p-type semiconductor layer, and a second active layer between the second n-type semiconductor layer and the second p-type semiconductor layer
Implementation Method 2
the quantum dots may convert light emitted from the second first active portion into light of a different color
Data Source
AI summary
A display device includes a plurality of first electrode pads respectively corresponding to emission areas which emit light of different colors, a second electrode pad disposed on a same layer as the plurality of first electrode pads, and a light-emitting element electrically connected to the plurality of first electrode pads and the second electrode pad, where the light-emitting element includes a first stack including a first n-type semiconductor layer, a first p-type semiconductor layer, and a first active layer therebetween, a second stack overlapping the first stack in a first emission area among the emission areas, and including a second n-type semiconductor layer, a second p-type semiconductor layer, and a second active layer therebetween, and a conductor electrically connecting the first n-type semiconductor layer of the first stack to the second n-type semiconductor layer of the second stack.