Display Substrate Bridge Electrode Contact Hole Formation
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Solution Overview
Problem
The formation of contact holes through a color filter layer, wavelength converting layer, and planarizing layer during the manufacturing of display substrates often results in defects, particularly during the etching process, affecting the electrical connections between electrodes.
Innovation Solution
A display substrate design that includes a base substrate with a switching device, a wavelength converting layer with quantum dots, a bridge electrode connected to the drain electrode through a first contact hole, and a pixel electrode connected to the bridge electrode through a second contact hole, with a planarizing layer and polarizing layer, allowing for separate formation of contact holes to reduce defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact holes are formed through color filter layer, wavelength converting layer, and planarizing layer using conventional etching process, then electrical connections between electrodes are achieved, but defects are generated during the etching process
Solution Approach 1:
The patent divides the contact hole formation process into multiple separate etching steps, each targeting a specific layer (color filter layer, wavelength converting layer, planarizing layer). This segmentation allows for optimized etching parameters for each layer, reducing defects while achieving the required electrical connections through the stacked structure.
2Adaptability or versatility
If multiple layers (color filter layer, wavelength converting layer, planarizing layer) are stacked to achieve display functionality, then display performance is improved, but the complexity of forming contact holes through all layers increases
Solution Approach 1:
The patent segments the contact hole formation into multiple sequential etching processes, each tailored to specific layer characteristics. This approach manages the complexity of penetrating through multiple functional layers by treating each layer independently with optimized etching conditions.
Solution Approach 2:
The patent performs preliminary patterning and etching steps on upper layers before forming the complete contact hole through all layers. This preliminary action simplifies the overall process by preparing each layer in advance with appropriate openings, making the final through-hole formation more manageable.
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 design reduces defects in the display substrate by allowing for precise and separate formation of contact holes, improving the electrical connections and overall manufacturing process efficiency.
Implementation Method 1
a wavelength converting layer disposed on the switching device, the wavelength converting layer including a quantum dot
Data Source
AI summary
A display substrate includes: a base substrate; a switching device disposed on the base substrate, the switching device including a gate electrode, a source electrode, and a drain electrode overlapping at least a part of the gate electrode; a wavelength converting layer disposed on the switching device, the wavelength converting layer including a quantum dot; a bridge electrode disposed on the wavelength converting layer, the bridge electrode electrically connected to the drain electrode through a first contact hole formed through the wavelength converting layer; a planarizing layer disposed on the wavelength converting layer; and a pixel electrode disposed on the planarizing layer, the pixel electrode electrically connected to the bridge electrode through a second contact hole formed through the planarizing layer.