Touch Signal Line Arrangement for Display Substrate Transmittance
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Solution Overview
Problem
In capacitive touch screens, the distance between touch signal lines and common electrodes is typically shorter than the distance between touch signal lines and pixel electrodes, leading to reduced electric field strength and decreased light transmittance in display apparatuses.
Innovation Solution
The display substrate is designed with a specific arrangement where the distance between orthographic projections of touch signal lines and pixel electrodes is less than the distance between touch signal lines and common electrodes, allowing for a stable planar electric field to be formed between the touch signal line and the pixel electrode, while preventing interference from the common electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the touch signal line is arranged closer to the common electrode to reduce the distance between them, then the electric field strength between the touch signal line and common electrode is improved, but the light transmittance of the display apparatus deteriorates due to interference from the common electrode
Solution Approach 1:
The patent applies local quality by creating different distance relationships in different regions: the touch signal line is positioned at a first distance from the pixel electrode and a second distance from the common electrode, where the first distance is less than the second distance. This localized differentiation optimizes the electric field strength near the pixel electrode while maintaining adequate spacing from the common electrode to preserve light transmittance, thereby resolving the contradiction between electric field strength and light transmittance in specific regions of the display.
2Measurement precision
If the touch signal line is arranged closer to the pixel electrode to improve electric field strength for touch detection, then the touch sensitivity is improved, but the distance to the common electrode increases reducing the overall electric field effectiveness
Solution Approach 1:
The patent applies parameter changes by precisely controlling the distance parameters between the touch signal line and the electrodes. Specifically, the first distance (between touch signal line and pixel electrode) is set to be less than the second distance (between touch signal line and common electrode). This parameter optimization ensures that the electric field strength is sufficiently strong for accurate touch detection while maintaining the proper balance with the common electrode, thus resolving the contradiction between touch detection precision and electric field strength.
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 arrangement improves the overall transmittance of the display apparatus by enabling effective deflection of liquid crystal molecules, thereby enhancing the light transmittance and display performance.
Implementation Method 1
a stable planar electric field to be formed between the touch signal line and the pixel electrode
Implementation Method 2
enabling effective deflection of liquid crystal molecules
Data Source
AI summary
A display substrate, including: a base substrate, a plurality of sub-pixels each including at least a pixel electrode and a common electrode; a first interlayer insulating layer between layers where the pixel electrode and the common electrode are respectively located; and a plurality of touch signal lines extending along a second direction and arranges side by side along a first direction, where a distance between orthographic projections of the touch signal line and the pixel electrode in the sub-pixel closest to the touch signal line in the first direction on the base substrate is a first distance; a distance between orthographic projections of the touch signal line and the common electrode in the sub-pixel closest to the touch signal line in the first direction on the base substrate is a second distance, and the first distance is less than the second distance.