Stacked Light Emitting Structure for Redundant Display Pixels
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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, and improving repairability and reliability, particularly in display apparatus applications.
Innovation Solution
A light emitting device configuration with two emission units, where a main emission unit and a redundancy emission unit are laminated, allowing for selective light emission and shared use of components to minimize space and enhance reliability, with a structure that includes a first and second n-type electrode, active layers, and p-type layers, and a passivation layer to protect and expose necessary areas for voltage application.
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
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 formed in the same pixel area as the main device, sharing common electrodes and substrate space, thereby improving reliability without increasing the overall device area.
Solution Approach 2:
The patent utilizes vertical stacking to arrange the main and redundancy light emitting devices in different layers within the same planar footprint. By forming the redundancy device above or below the main device with shared electrodes, the solution transitions from horizontal space occupation to vertical layering, maintaining high pixel density while ensuring reliability.
2Productivity
If two emission units are laminated in one light emitting device, then usage yield is improved, but device complexity increases
Solution Approach 1:
The patent merges two emission units into a single light emitting device structure, allowing both units to be manufactured in the same process batch. This combining approach improves usage yield by reducing the number of separate devices needed while managing complexity through shared structural elements like common electrodes and substrate integration.
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 improves yield, reduces manufacturing costs, minimizes space for redundancy devices, enables high resolution and transmittance, facilitates easy repair, and enhances heat generation and lifespan reliability by allowing selective luminance modes and shared transistor operation.
Implementation Method 1
a light emitting device in which two emission units manufactured by separate processes are laminated is configured to improve a usage yield of a light emitting device by a mixture effect of wavelengths of light emitted from two emission units
Data Source
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.