LED Display Pixel Structure With Overlapping RGB Emission Areas
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Solution Overview
Problem
Existing light emitting diode (LED) display devices face challenges in achieving high resolution due to the limited size of individual LEDs, particularly for red-colored LEDs, which also have lower emission efficiency compared to green and blue LEDs.
Innovation Solution
The proposed LED display device incorporates a substrate with overlapping emission areas for LEDs, each with a specific active layer for red, green, and blue colors. This design includes a first semiconductor layer, a first active layer, and a second semiconductor layer for the red emission area, and similar layers for the green and blue emission areas, all driven by respective transistors. The active layers are doped with europium for red emission and indium for green and blue emissions, and the semiconductor layers are made of gallium nitride materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the area of red LED is enlarged to improve emission efficiency, then the emission efficiency of red LED is improved, but the pixel density and resolution decrease
Solution Approach 1:
The patent combines multiple active layers (red, green, blue) within a single pixel structure, allowing them to share common electrodes and substrate area. This merging approach enables each color to have sufficient emission area while maintaining high pixel density, as the layers occupy overlapping spatial volumes rather than requiring separate lateral space.
Solution Approach 2:
The patent transitions from a two-dimensional lateral arrangement of separate red, green, and blue subpixels to a three-dimensional stacked structure where multiple active layers are vertically positioned. This dimensional change allows the emission areas to overlap in the lateral plane while being separated in the vertical dimension, thereby increasing pixel density without sacrificing individual LED emission area.
2Loss of energy
If different substrates are used for red and green/blue LEDs, then the emission efficiency of each color is optimized, but the fabrication process becomes complicated and cost increases
Solution Approach 1:
The patent employs a universal sapphire substrate that serves as the common foundation for growing all active layers (red, green, and blue LEDs). This single substrate performs multiple functions: providing mechanical support, enabling epitaxial growth of different semiconductor materials, and facilitating integrated fabrication. The universality of the substrate simplifies the fabrication process by eliminating the need for multiple substrate handling steps while still allowing optimization of each color's emission characteristics through material composition control.
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 allows for a higher pixel density, achieving resolutions greater than 300 ppi and ultra-high resolutions greater than 500 ppi, while also improving the emission efficiency of each active layer, resulting in a high luminance image. Additionally, the simplified fabrication process and shared substrate for all active layers reduce fabrication costs and time.
Implementation Method 1
a first active layer corresponding to a first emission area, a second active layer on the second semiconductor layer and corresponding to a second emission area overlapping a portion of the first emission area, a third active layer on the second semiconductor layer and corresponding to a third emission area overlapping another portion of the first emission area
Data Source
AI summary
The present disclosure relates to an LED display device, and more particularly, to an LED display device including a repair structure for a deteriorated pixel. In the present disclosure, a subLED electrically connected to first and second connecting electrodes for applying a voltage to a LED is disposed on a deteriorated LED. Thus, deterioration of a display quality due to a deteriorated pixel is prevented. Since it is not required to remove a deteriorated LED, a fabrication cost is reduced and a process efficiency is improved.