In-Cell Touch Display Electrode Fabrication Process
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Solution Overview
Problem
The existing manufacturing processes for display devices integrated with touch screen panels are complex and costly, particularly for the in-cell type, which requires additional processes to form touch sensing electrodes, making them uncompetitive.
Innovation Solution
A simplified manufacturing process for display devices with a touch screen panel is achieved by positioning the second touch connection pattern on the touch signal line through a second contact hole in the first electrode protective layer, where the width of the touch signal line is narrower than the first touch connection pattern, and the second contact hole exposes the touch signal line, allowing for reduced mask usage and streamlined fabrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the in-cell type touch sensing electrode is formed using additional processes, then the touch sensing function is achieved, but the manufacturing cost and production time increase significantly
Solution Approach 1:
The patent merges the touch signal line formation with the existing electrode structure by positioning the touch signal line on top of the first electrode within the same manufacturing sequence. This integration eliminates the need for separate touch sensing electrode formation processes, thereby achieving touch sensing functionality while avoiding additional manufacturing steps and reducing overall process complexity
Solution Approach 2:
The first electrode serves dual functions: it acts as both the display electrode and the touch signal transmission line. By making the first electrode serve multiple purposes, the patent eliminates the need for dedicated additional touch sensing electrodes, thereby reducing manufacturing process complexity while maintaining touch sensing capability
2Reliability
If additional processes are used to form touch sensing electrodes, then the touch screen functionality is achieved, but the production time and cost increase
Solution Approach 1:
The touch signal line is formed during the same manufacturing step as the first electrode, before subsequent processing steps. By performing the touch signal line formation in advance as part of the electrode fabrication process, the patent eliminates the need for later additional processes, thereby improving production efficiency while ensuring touch screen functionality
Solution Approach 2:
The patent combines the formation of the first electrode and the touch signal line into a single manufacturing operation. This merging of operations reduces the total number of production steps required, thereby increasing productivity while maintaining both display and touch screen functionalities
3Manufacturing precision
If the touch signal line width is narrower than the first touch connection pattern, then the manufacturing precision is improved, but the alignment requirements become more stringent
Solution Approach 1:
The patent applies different width specifications to different regions: the touch signal line has a narrower width for precision, while the first touch connection pattern has a wider width for ease of connection. This local differentiation allows the narrow touch signal line to be precisely formed within the broader, more easily manufactured connection pattern area, thereby achieving high manufacturing precision without excessively stringent alignment requirements across the entire structure
Data Source
AI summary
Disclosed is a display device (100) integrated with a touch screen panel and a method for fabricating the same. The display includes: a TFT positioned at each pixel region; a first electrode (840a) spaced from one of a source electrode (824) or a drain electrode (826) of the TFT; a second electrode (870a) facing the first electrode (840a); a TFT protective layer positioned on the TFT and has a first contact hole; a touch signal line positioned between a first touch connection pattern (840b), which is made of the same material as the first electrode (840a), and a second touch connection pattern (870b) made of the same material as the second electrode (870a), and transfers a touch driving signal to the second touch connection pattern (870b); a first connection pattern made of the same material as the second electrode (870a); and a first electrode protective layer (860) positioned on the first electrode (840a) and the touch signal line.