Color Filter Substrate Spacer Segmentation for Touch Panel Yield
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Solution Overview
Problem
Conventional touch panels face production yield and operational efficiency issues due to short circuits caused by the overlap of transparent electrodes and conductive layers, resulting in line and dot defects.
Innovation Solution
A color filter substrate is fabricated with a planarization layer that exposes sensing spacers and forms a step height between main spacers and the electrode layer, preventing short circuits and simplifying the fabrication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the transparent electrode layer is formed to cover the main spacers simultaneously with the sensing spacers, then the fabrication process is simplified, but short circuits occur between the transparent electrode and the conductive layer resulting in line and dot defects
Solution Approach 1:
The invention segments the spacer formation process into two distinct stages: first forming sensing spacers on the color filter layer, then forming main spacers on the transparent electrode layer after it is deposited. This segmentation prevents the electrode from covering both spacer types simultaneously, eliminating the short circuit issue while maintaining process efficiency.
Solution Approach 2:
The transparent electrode layer is deposited in advance before the main spacers are formed. This preliminary action allows the electrode to be fully established on the substrate, providing a stable base for subsequent spacer formation and ensuring proper electrical isolation between the electrode and main spacers.
2Productivity
If the main spacers and sensing spacers are formed at the same time, then the fabrication steps are reduced, but the uniformity of main spacers deteriorates due to electrode layer interference
Solution Approach 1:
The spacer formation is divided into sequential steps: sensing spacers are formed first on the color filter layer, then the transparent electrode is deposited, and finally main spacers are formed on the electrode surface. This segmentation ensures that each spacer type is formed under optimal conditions, guaranteeing uniformity while maintaining reasonable fabrication efficiency.
3Ease of manufacture
If the electrode layer covers the main spacers, then the fabrication process is simplified, but production yield decreases due to short circuit defects
Solution Approach 1:
The transparent electrode layer is deposited completely before any main spacers are formed. This preliminary deposition ensures that the electrode layer is continuous and uniform across the entire substrate, eliminating gaps or defects that could cause short circuits and thereby improving production yield.
Solution Approach 2:
The fabrication process is segmented to form main spacers after electrode deposition rather than simultaneously. This segmentation eliminates the short circuit defect mechanism while adding only one additional process step, thus maintaining high production yield with minimal impact on manufacturing simplicity.
Data Source
AI summary
A method for fabricating a color filter substrate including the following procedures is provided. First, a substrate is provided and a color filter layer is formed thereon. Next, a plurality of sensing spacers is formed on a part of the color filter layer. Then, a planarization layer is formed to cover the color filter layer and expose the sensing spacers. Next, an electrode layer is formed to cover the planarization layer and the sensing spacers. After that, a plurality of main spacers is formed on a part of the electrode layer excluding disposing regions of the sensing spacers, wherein a step height is formed between the main spacers and the electrode layer above sensing spacers.