Touch Electrode Column Segmentation for Display Brightness Uniformity
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Solution Overview
Problem
Existing display substrates experience uneven brightness due to differences in common voltages across touch electrodes, leading to inconsistent display performance.
Innovation Solution
The display substrate incorporates multiple touch electrodes arranged in columns, connected via switching units and common electrode lines, which are disconnected during touch detection and connected during display stages to reduce resistance and voltage drop, ensuring uniform voltage distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If touch electrodes in all columns are connected together and serve as common electrodes, then the manufacturing process is simplified and thickness is reduced, but uneven brightness occurs due to different common voltages
Solution Approach 1:
The patent divides the touch electrode connections into multiple independent columns, with each column having its own switching unit and common electrode line. This segmentation allows independent voltage control for each column, preventing the brightness uniformity issue that would occur with a single unified connection while still maintaining manufacturing simplicity.
Solution Approach 2:
The patent introduces switching units that can dynamically change the connection state of touch electrodes between different operating modes (touch detection and display stages). This dynamic switching capability allows the system to adapt the electrical connections based on operational requirements, resolving the contradiction between simplified manufacturing and brightness uniformity.
2Measurement precision
If touch electrodes in each column are disconnected from other columns during touch detection, then touch detection precision is improved, but device complexity increases due to switching units
Solution Approach 1:
The switching units serve multiple functions: they enable column isolation during touch detection for precise measurement, and simultaneously enable column connection during display operation for uniform common voltage. This multi-functionality reduces the need for separate dedicated components for each function, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent merges the functions of touch detection and display operation into a single integrated structure with shared components. The switching units and common electrode lines serve both touch detection and display functions, reducing overall device complexity compared to having separate independent systems for each function.
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 effectively reduces resistance and voltage drop across touch electrode lines, preventing uneven brightness and ensuring consistent display performance.
Implementation Method 1
reduces resistance and voltage drop across touch electrode lines
Data Source
AI summary
The present disclosure provides a display substrate, a driving method thereof and a display device. The display substrate includes a touch region. Multiple touch electrodes are arranged in columns at the touch region, and the touch electrodes in each column are connected together. At a touch detection stage, the 5 touch electrodes in each column at the touch region are disconnected from the touch electrodes in the other columns, and at a display stage, the touch electrodes in the columns at the touch region are connected together and serve as common electrodes.