Display Pixel Layout for Wave Deviation Compensation
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Solution Overview
Problem
The challenge in manufacturing display devices is the occurrence of wave deviation in semiconductor light emitting devices due to wafer warpage during the semiconductor deposition process, leading to the mura phenomenon where images are displayed with different colors in each pixel.
Innovation Solution
The solution involves compensating for wave deviations in semiconductor light emitting devices by adjusting the areas of their light emitting regions, such as the transparent conductive layer, active layer, contact electrode, and current blocking layer, to ensure uniform main wave emission across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple semiconductor layers are grown on a wafer under different temperature conditions with different material properties, then each semiconductor layer can be formed with its required properties, but stress is generated in the wafer causing warpage and wave deviation
Solution Approach 1:
The patent introduces a compensation layer with specifically controlled thickness and material properties to counterbalance the stress generated by multiple semiconductor layers. By adjusting the compensation layer parameters (thickness, material composition), the net stress in the wafer is reduced, preventing warpage and wave deviation while allowing multiple semiconductor layers to be grown with their required properties
2Manufacturing precision
If the area of light emitting regions is adjusted to compensate for wave deviation, then uniform main wave emission can be achieved, but the structure becomes more complex
Solution Approach 1:
The patent extracts the wave deviation compensation function from the light emitting device structure itself and transfers it to a separate compensation layer in the wafer structure. This separation allows the light emitting devices to maintain their original simple structure while the compensation layer handles the wave deviation correction through its stress-balancing properties
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 approach effectively minimizes wave deviations and prevents the mura phenomenon, resulting in a display device with uniform pixel color and improved image quality without the need for costly hardware or software corrections.
Implementation Method 1
different semiconductor materials are deposited on the wafer under high temperature conditions to grow each semiconductor layer
Implementation Method 2
the temperature conditions for forming each semiconductor layer are different, and the material type of each semiconductor layer is different. In particular, material properties such as a lattice constant of each semiconductor layer can be different from each other. Therefore, when each semiconductor layer is grown, if the temperature conditions are different and material properties such as the lattice constant of each semiconductor layer are different, stress can be generated in the wafer, and the stress can cause the wafer to warp in a specific direction
Data Source
AI summary
A display device can include a substrate including a plurality of first sub-pixels, a plurality of second sub-pixels, a plurality of third sub-pixels; a plurality of first semiconductor light emitting devices disposed in the plurality of first sub-pixels, and configured to generate first color light of a first main wave; a plurality of second semiconductor light emitting devices disposed in the plurality of second sub-pixels, and configured to generate second color light of a second main wave; and a plurality of third semiconductor light emitting devices disposed in the plurality of third sub-pixels, and configured to generate third color light of a third main wave, in which at least some of the plurality of first semiconductor light emitting devices have different light emitting regions to compensate for a wave deviation of the first main wave.