LED Sub-Pixel Partition Structure for Uniform Display Emission
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Solution Overview
Problem
Display apparatuses using semiconductor LEDs face challenges in achieving uniform light emission across their entire region, leading to inconsistencies in brightness and color representation.
Innovation Solution
A display apparatus design featuring a pixel array with a semiconductor stack, conductive partition structure, wavelength conversion portions, and a common electrode, which includes a circuit board with a driving circuit and a pixel array comprising sub-pixels with LED cells, textured surfaces, and a transparent insulating layer to enhance light emission uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If semiconductor LEDs are used as light sources in display apparatuses, then compact size and high luminance are achieved, but uniform light emission across the entire region deteriorates
Solution Approach 1:
The patent applies local quality by introducing textured surfaces at specific locations (on the lower surface of the first conductivity-type semiconductor layer and inner surfaces of the conductive partition structure) to selectively enhance light extraction in regions where it is needed, rather than uniformly modifying the entire semiconductor structure. This localized texturing improves light emission uniformity across the display region while maintaining the compact LED structure.
Solution Approach 2:
The patent introduces textured surfaces that create micro-scale three-dimensional structures on two-dimensional surfaces. This dimensional transformation from flat surfaces to textured surfaces increases the effective surface area and creates multiple light extraction pathways, thereby improving light emission uniformity across the display region without increasing the overall device footprint.
2Ease of manufacture
If conventional LED structures are used, then manufacturing is simpler, but light leakage between sub-pixels occurs
Solution Approach 1:
The patent applies segmentation by dividing the semiconductor structure into distinct regions separated by conductive partition structures. These partitions create isolated sub-pixel regions that prevent light from leaking between adjacent sub-pixels, while still allowing each sub-pixel to be manufactured using standard LED fabrication processes.
Solution Approach 2:
The conductive partition structures serve as intermediary elements between adjacent LED cells and sub-pixels. These partitions act as physical barriers that block light propagation between sub-pixels while maintaining electrical connectivity through the conductive material, thus eliminating light leakage without requiring complete structural isolation.
3Loss of energy
If light extraction is enhanced, then optical efficiency improves, but light emission uniformity across the region deteriorates
Solution Approach 1:
The patent applies local quality by introducing textured surfaces at specific locations (on the lower surface of the first conductivity-type semiconductor layer and inner surfaces of the conductive partition structure) to selectively enhance light extraction in regions where it is needed, rather than uniformly modifying the entire semiconductor structure. This localized texturing improves light emission uniformity across the display region while maintaining the compact LED structure.
Solution Approach 2:
The patent introduces textured surfaces that create micro-scale three-dimensional structures on two-dimensional surfaces. This dimensional transformation from flat surfaces to textured surfaces increases the effective surface area and creates multiple light extraction pathways, thereby improving light emission uniformity across the display region without increasing the overall device footprint.
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 solution ensures improved uniform light emission and reduced light leakage between sub-pixels, resulting in a more consistent and efficient display with enhanced optical efficiency and miniaturization capabilities.
Implementation Method 1
textured regions of the first conductivity-type semiconductor layer, respectively exposed by the sub-pixel spaces, have textured surfaces
Implementation Method 2
wavelength conversion portions, respectively provided in the sub-pixel spaces
Data Source
AI summary
A display apparatus includes: a circuit board including a driving circuit; and a pixel array disposed on the circuit board and including pixels, each of the pixels having a plurality of sub-pixels. The pixel array includes: a semiconductor stack, a conductive partition structure and wavelength conversion portions. The semiconductor stack includes LED cells respectively constituting the plurality of sub-pixels. Each of the LED cells includes at least an active layer and a second conductivity-type semiconductor layer. The conductive partition structure is provided between sub-pixel spaces, respectively overlaps the LED cells on the semiconductor stack, and is provided as a first electrode. The wavelength conversion portions are respectively disposed on the sub-pixel spaces.