Wearable Display Subpixel Trench and Heating Wire Patterning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wearable display devices, such as head-mounted displays, face challenges in preventing leakage current between adjacent pixels due to the close spacing of pixels, which leads to color crosstalk.
Innovation Solution
The method involves depositing and patterning an organic material for each subpixel using a heating wire, and improving the encapsulation performance using a trench. This process includes forming a semiconductor backplane and a light emitting element backplane on a substrate, depositing pixel electrodes and forming a trench between subpixels, and using heating wires to remove excess organic material and encapsulation layers in specific areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the distance between pixels is reduced to increase resolution, then display resolution is improved, but leakage current between adjacent pixels is generated causing color crosstalk
Solution Approach 1:
The patent divides the pixel defining layer into separate regions by forming trenches between adjacent subpixels. This segmentation physically separates the conductive paths of neighboring pixels, preventing leakage current from traveling between them while maintaining high pixel density for improved resolution.
Solution Approach 2:
The patent introduces an intermediate layer between adjacent pixels that includes a trench structure. This intermediate region acts as a barrier that blocks leakage current paths while allowing the pixel electrodes to maintain close spacing for high resolution display.
2Object-generated harmful factors
If organic material is deposited for each subpixel to prevent leakage current, then color crosstalk is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent performs preliminary patterning of the pixel defining layer to form trenches before depositing organic materials. This preliminary structure preparation creates defined regions that guide subsequent material deposition, ensuring organic material is deposited only in appropriate areas while simplifying the overall manufacturing sequence.
Solution Approach 2:
The patent applies different treatments to different regions: trenches are formed between subpixels to block leakage, while organic materials are deposited selectively in specific areas. This local differentiation prevents color crosstalk in critical regions while maintaining manufacturing efficiency.
3Manufacturing precision
If heating wires are used to pattern organic material precisely, then leakage current is prevented, but additional manufacturing steps are required
Solution Approach 1:
The patent replaces traditional mechanical or chemical etching methods with a heating wire-based approach for patterning organic materials. The heating wire locally heats and removes organic material through thermal decomposition, achieving precise patterning without requiring complex chemical processing steps.
Solution Approach 2:
The patent uses temperature as a control parameter to selectively remove organic material. By controlling the heating wire temperature and exposure time, precise patterning is achieved where organic material is removed only in contact areas with the heating wire, creating defined boundaries that prevent leakage current.
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 prevents leakage current and reduces color crosstalk between subpixels, enhancing the display quality and resolution of wearable devices.
Implementation Method 1
removing a portion of the first organic material deposited around the heating wires and the trench by heating the heating wires
Implementation Method 2
removing the first organic material, the first common electrode, and the first encapsulation layer deposited in a second subpixel and a third subpixel by using a first photo-patterning process
Data Source
AI summary
A display device may include a pixel defining layer defining subpixels, a pixel electrode of each subpixel disposed in an opening of the pixel defining layer, a trench formed by etching a portion of the pixel defining layer and surrounding a portion of each of the subpixels, heating wires disposed on the pixel defining layer and spaced apart from each other with the trench between the heating wires, a first organic material covering a first pixel electrode of a first subpixel and a portion of the pixel defining layer surrounding the first pixel electrode, a second organic material covering a second pixel electrode of a second subpixel and a portion of the pixel defining layer surrounding the second pixel electrode, and a third organic material covering a third pixel electrode of a third subpixel and a portion of the pixel defining layer surrounding the third pixel electrode.