Array Substrate Layout for Uniform Touch Display Brightness
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Solution Overview
Problem
In touch display panels with integrated touch and display driver technology, the asymmetrical placement of touch lines relative to data signal lines leads to inconsistent coupling capacitances, affecting the distribution of liquid crystal molecules and resulting in color and brightness differences across the display, thereby degrading the display quality.
Innovation Solution
The array substrate design includes specific configurations of pixel electrodes, data lines, and touch lines, where the distances between these elements are optimized to minimize differences in coupling capacitances, ensuring consistent voltage distribution across the display panel, thereby improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If touch lines are integrated in the same layer as data lines, then device complexity is reduced, but coupling capacitance inconsistency arises causing display non-uniformity
Solution Approach 1:
The patent applies local quality by differentiating the spacing relationships in different regions. Specifically, the distance from the first pixel electrode column to the first data line is made greater than the distance from the second pixel electrode column to the second data line, and greater than the distance from the third pixel electrode column to the third data line. This localized variation in spacing compensates for the asymmetrical placement of touch lines, ensuring that coupling capacitances remain consistent across different regions of the display panel.
2Adaptability or versatility
If touch lines are placed between pixel electrode columns and data lines, then routing flexibility is improved, but coupling capacitance differences increase affecting color and brightness
Solution Approach 1:
The patent applies parameter changes by precisely controlling the spacing parameters between electrodes and data lines. The key parameter adjustment is making the distance from the first pixel electrode column to the first data line (first distance) greater than the distances from the second and third pixel electrode columns to their respective data lines. This parameter modification compensates for the capacitive coupling effects introduced by the touch lines placed between pixel electrode columns and data lines, thereby maintaining color and brightness consistency.
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
The optimized array substrate configuration reduces voltage differences between pixel electrodes and data lines, neutralizing color and brightness differences, thereby enhancing the display quality and uniformity across the touch display panel.
Implementation Method 1
the asymmetrical placement of touch lines relative to data signal lines leads to inconsistent coupling capacitances, affecting the distribution of liquid crystal molecules
Data Source
AI summary
An array substrate includes multiple pixel electrodes constituting first pixel electrode columns, second pixel electrode columns and third pixel electrode columns, and data lines including first data lines, second data lines and third data lines. A first data line, a first pixel electrode column, a second data line, a second pixel electrode column, a third data line and a third pixel electrode column are arranged in sequence in a row direction. Distances between the first pixel electrode column and the first data line, between the second pixel electrode column and the second data line, between the third pixel electrode column and the third data line, and between the first pixel electrode column and the second data line are a first distance to a fourth distance, respectively. The first distance is less than the fourth distance and greater than the second distance and/or the third distance.