Array Substrate Touch Electrode Segmentation for Flicker Reduction
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Solution Overview
Problem
In-cell structured touch displays experience issues with display quality due to capacitive coupling effects, leading to flickers or stripes caused by shared common electrodes across multiple pixel lines, which affect the potential difference between pixel and common electrodes.
Innovation Solution
The array substrate design features touch control electrodes with projections that cover multiple gate lines, where each line of pixel cells corresponds to a unique sub common electrode, ensuring independent potential control and eliminating shared electrode effects, thereby maintaining consistent potential differences between pixel and common electrodes across lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a shared common electrode is used across multiple pixel lines to reduce device complexity, then the number of electrodes is reduced, but capacitive coupling effects cause potential fluctuations that lead to flickers and stripes
Solution Approach 1:
The common electrode layer is segmented into multiple independent common electrodes, where each common electrode corresponds to one pixel line. This segmentation isolates the capacitive coupling effects to individual lines, preventing potential fluctuations from affecting other lines and eliminating flickers and stripes caused by shared electrodes.
2Speed
If gate drive signals are overlapped to improve driving efficiency, then the driving speed is enhanced, but potential fluctuations on shared common electrodes cause interference between adjacent lines
Solution Approach 1:
By segmenting the common electrode layer into line-specific common electrodes, the patent isolates potential fluctuations to individual lines. This allows gate drive signals to be overlapped for improved driving efficiency without causing interference between adjacent lines, as each line's common electrode independently handles its own potential variations.
3Volume of moving object
If the common electrode layer is integrated with the touch control electrode layer to reduce substrate usage, then the display panel can be thinner, but display quality deteriorates due to capacitive coupling effects
Solution Approach 1:
The patent integrates the common electrode layer with the touch control electrode layer while segmenting the common electrodes into line-specific units. This allows the display panel to maintain reduced thickness through integration while eliminating display quality issues by preventing capacitive coupling effects from affecting multiple lines simultaneously.
Solution Approach 2:
Each common electrode is designed to correspond to a specific pixel line, creating local independence in the electrode structure. This local quality differentiation ensures that capacitive coupling effects are confined to individual lines, maintaining display quality while preserving the space-saving benefits of electrode layer integration.
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 effectively alleviates flickers and stripes, improving display quality by ensuring consistent potential differences between pixel and common electrodes, even when gate drive signals overlap, thus enhancing the overall display effect.
Implementation Method 1
a gate line layer configured with a plurality of gate lines, and a common electrode layer configured with a plurality of common electrodes
Implementation Method 2
the touch control electrodes have a projection on the array substrate along a direction perpendicular to the array substrate, and the projection covers n gate lines
Data Source
AI summary
An array substrate and a drive method thereof, a touch control display and a display apparatus are provided. An array substrate includes, in part, a gate line layer configured with a multitude of gate lines, and a common electrode layer configured with a multitude of common electrodes. The common electrodes further operate as touch control electrodes with a projection on the array substrate along a direction substantially perpendicular to the array substrate. The projection covers n gate lines, where n is a positive integral number. At least one of the touch control electrodes comprises n sub common electrodes each having a projection on the array substrate along the direction substantially perpendicular to the array substrate covering one of the gate lines. Accordingly, less flicks or stripes appear on the display.