In-cell Touch Display Parasitic Capacitance Compensation
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Solution Overview
Problem
Existing in-cell touch display apparatuses face challenges in achieving uniformity and brightness due to the limitations in the structure of touch sensor units and their connections to the display driving integrated chip.
Innovation Solution
The proposed solution involves a substrate structure with touch sensor units arranged in a matrix, connected by lines that form parasitic capacitors, and compensating portions that maintain a constant sum of capacitances, allowing for improved uniformity and brightness by adjusting the lengths and positions of these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch sensor units are connected to display driving IC through extended connecting lines, then electrical connection is achieved, but parasitic capacitance increases causing non-uniformity and reduced brightness
Solution Approach 1:
The patent converts the harmful parasitic capacitance formed by connecting lines into a beneficial compensation mechanism. By intentionally designing compensating portions with specific capacitance values that match the parasitic capacitance of connecting lines, the harmful effect is transformed into a useful compensation function that restores signal uniformity across the display.
Solution Approach 2:
The patent introduces compensating portions as intermediary elements between the touch sensor units and the display driving IC. These compensating portions act as mediators that offset the harmful effects of the connecting lines, enabling uniform signal transmission without requiring changes to the fundamental connection architecture.
2Reliability
If connecting lines are extended to connect touch sensor units, then electrical connectivity is established, but display uniformity deteriorates due to varying parasitic capacitance
Solution Approach 1:
The patent applies local quality by designing compensating portions with specific capacitance values tailored to the local requirements of different connecting lines. Each compensating portion is customized to match the parasitic capacitance of its corresponding connecting line, enabling precise compensation that restores display uniformity across the entire panel.
3Area of stationary object
If touch sensor units are arranged in matrix with extended connections, then coverage area is increased, but parasitic capacitance varies causing brightness non-uniformity
Solution Approach 1:
The patent employs parameter changes by adjusting the capacitance values of compensating portions to match the varying parasitic capacitance of connecting lines that extend across different areas of the display. This parameter matching enables uniform brightness compensation across the entire display area, allowing large-area coverage without sacrificing uniformity.
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 configuration enhances the uniformity and brightness of the display by compensating for parasitic capacitance, resulting in a more effective in-cell touch display apparatus.
Implementation Method 1
a plurality of touch sensor units 15 formed on the substrate structure 10, and a display driving integrated chip (IC) 20 positioned on the substrate structure 10... connecting lines 16... form parasitic capacitors
Data Source
AI summary
An in-cell touch display apparatus includes a substrate structure, a display driving integrated chip (IC), and a plurality of touch sensor units arranged in a matrix. Each of the touch sensor units includes a plurality of connecting lines of difference lengths and a plurality of compensating portions corresponding to the connecting lines in a one-to-one relationship. Each of the connecting lines establishes an electrical connection between the touch sensor unit and the display driving IC. The compensating portions are electrically connected to the display driving IC. The connecting lines and the compensating portions receive a common voltage from the display driving IC during the display period. A sum of the lengths of the connecting line and the compensating portion is constant throughout the plurality of connecting lines so as to compensate for different capacitances of the connecting lines.