Array Substrate Via Hole Density Reduction for Touch Display Streaks
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Solution Overview
Problem
In-cell mutual capacitive touch technology in touch display devices faces issues with poor waterproof properties, low report rate, and high cost, along with visible streaks due to high density of via holes in the screen display caused by separate drive circuits for display and touch electrodes.
Innovation Solution
An array substrate design featuring a common electrode layer divided into self-capacitive electrodes connected to a drive circuit through touch leads, with at least one continuous touch lead passing through a column of electrodes and via holes spaced greater than or equal to two pixel units, reducing the number and density of via holes to alleviate streaks and improve waterproofing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If via holes are used to connect touch leads to touch electrodes, then electrical connection is achieved, but visible streaks appear in screen display due to high density of via holes
Solution Approach 1:
The patent extracts and removes the harmful via holes from the display area by designing touch leads that run along the edges of pixel units and connect to touch electrodes through fewer, strategically positioned via holes. This extraction approach eliminates the harmful visual streaks while preserving the necessary electrical connection function.
Solution Approach 2:
The touch lead is segmented into multiple sections that run along the edges of pixel units, with via holes positioned at specific intervals rather than densely distributed. This segmentation allows the touch lead to maintain electrical connectivity while spacing out the via holes to avoid visible streaks in the display.
2Adaptability or versatility
If separate drive circuits are used for display panel electrodes and touch panel electrodes, then functional independence is achieved, but device cost increases
Solution Approach 1:
The patent merges the drive circuit functionality by integrating the touch electrode drive circuit into the existing display panel drive circuit. The touch leads are connected to the same drive circuit that controls the display electrodes, eliminating the need for separate drive circuits and reducing device cost while maintaining functional independence through the layered structure of the display and touch panels.
Solution Approach 2:
The drive circuit is designed with multi-functionality to serve both the display electrodes and the touch electrodes. By making the drive circuit universal, it can control both types of electrodes without requiring separate dedicated circuits, thereby reducing overall device complexity and cost.
3Adaptability or versatility
If in-cell mutual capacitive touch technology is used, then touch functionality is integrated, but waterproof property deteriorates
Solution Approach 1:
The patent extracts the touch electrode structure from the internal mutual capacitive configuration and positions it on the outer surface of the display panel. This extraction allows the touch electrodes to be separated from the internal cavity, enabling better sealing and waterproofing while maintaining the integrated touch functionality.
Solution Approach 2:
The touch electrodes are positioned in a different spatial dimension (on the outer surface rather than within the internal cavity), which allows for improved sealing arrangements and waterproofing without compromising the integrated touch functionality.
4Adaptability or versatility
If in-cell mutual capacitive touch technology is used, then touch functionality is integrated, but report rate decreases
Solution Approach 1:
The patent extracts the touch sensing capability from the internal mutual capacitive structure and implements it through self-capacitive touch electrodes on the outer surface. This extraction enables better contact with the user's finger and improved signal detection, resulting in a higher report rate while maintaining integrated touch functionality.
Solution Approach 2:
The patent changes the capacitive sensing parameters by using self-capacitive electrodes instead of mutual capacitive electrodes. This parameter change improves the detection sensitivity and response speed, leading to a higher report rate for touch inputs.
Data Source
AI summary
One inventive aspect is an array substrate, which includes a plurality of touch leads, a common electrode layer, and a drive circuit. The common electrode layer is divided into a plurality of columns of self-capacitive electrodes, which are electronically connected to the drive circuit through the touch leads. The array substrate also includes a plurality of pixel units. Each touch lead is electronically connected to the self-capacitive electrode corresponding to the touch lead via a first via hole. At least one touch lead is parallel to and cross over one column of the self-capacitive electrodes. In a direction perpendicular to the array substrate, a projection of the self-capacitive electrode covers projections of a plurality of pixel units. In addition, along a direction of the touch leads, an interval between two adjacent first via holes is greater than or equal to a length of two pixel units.