Stacked Light Emitting Structure With Built-In Redundancy
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Solution Overview
Problem
Current light emitting devices face challenges in reducing manufacturing costs, minimizing space for redundancy devices, achieving high resolution and transmittance, easy repairability, and improving luminance and heat generation characteristics.
Innovation Solution
A light emitting device configuration with two emission units, where a main emission unit and a redundancy emission unit are laminated, sharing a common p-type electrode, allowing selective operation of either unit to maintain functionality and reduce space requirements, enabling high resolution and transmittance, and improving reliability and luminance modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a redundancy light emitting device is disposed separately, then reliability is improved, but device area increases and resolution decreases
Solution Approach 1:
The patent combines the main light emitting device and the redundancy light emitting device into a single integrated structure. The redundancy device is positioned adjacent to the main device and shares common electrodes (anode and cathode) and encapsulation layers, eliminating the need for separate disposal space while maintaining reliability through the backup functionality.
2Reliability
If two separate light emitting devices are manufactured, then functionality is ensured, but manufacturing cost increases and yield decreases
Solution Approach 1:
The main light emitting device and redundancy device are manufactured as an integrated unit on the same substrate, sharing common structural elements including the substrate, encapsulation layers, and electrode connections. This unified manufacturing approach reduces process complexity, material consumption, and overall manufacturing cost while ensuring functionality through the built-in redundancy.
Solution Approach 2:
The integrated structure serves dual functions: the main light emitting device provides primary illumination while the adjacent redundancy device provides backup functionality. Both devices share common structural components and manufacturing processes, achieving multi-functionality in a single manufacturing run that reduces costs and improves yield.
3Measurement precision
If display resolution is increased, then image quality improves, but the space for redundancy devices decreases
Solution Approach 1:
By integrating the redundancy device adjacent to the main device and sharing common electrodes and encapsulation structures, the patent minimizes the additional space required for redundancy. This compact integrated design allows high-resolution pixel arrangements without sacrificing the necessary space for backup functionality, thereby maintaining both high display resolution and reliability.
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
This configuration enhances yield, reduces manufacturing costs, minimizes space for redundancy devices, allows for easy repair, and improves heat generation and reliability, while enabling both low and high luminance modes.
Implementation Method 1
a first active layer disposed on the first n-type layer, a first p-type layer disposed on the first active layer... a second active layer disposed on the second p-type layer
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
According to an aspect of the present disclosure, a light emitting device and a display apparatus including the same are discussed. The light emitting device can include an n-type electrode, a first n-type layer disposed on the n-type electrode, a first active layer disposed on the first n-type layer, a first p-type layer disposed on the first active layer, a p-type electrode disposed on the first p-type layer, a second p-type layer disposed on a partial area of the p-type electrode, a second active layer disposed on the second p-type layer, and a second n-type layer disposed on the second active layer.