Display Substrate Common Electrode Voltage Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In TFT-LCD display devices, voltage attenuation at different regions of the TFT array substrate leads to varying pixel voltages and common voltages, resulting in non-uniform grayscale differences and display effects.
Innovation Solution
A display substrate with sub-regions, each containing subpixel units, common electrode voltage input lines, and control TFTs, where the gate electrode of the control TFT is coupled to the common electrode voltage control line, and the source and drain electrodes are coupled to the common electrode, allowing for controlled voltage application to ensure identical voltage differences between pixel and common voltages across regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an identical common voltage is applied to all regions, then the manufacturing and control are simplified, but voltage attenuation causes different voltage differences between pixel and common voltages at different regions, resulting in non-uniform display effect
Solution Approach 1:
The display substrate is divided into multiple sub-regions, with each sub-region having its own control TFT and common electrode voltage control line. This segmentation allows independent voltage control for each sub-region, enabling compensation for voltage attenuation differences across different regions while maintaining uniform display effect.
Solution Approach 2:
Different common electrode voltages are applied to different sub-regions based on their specific voltage attenuation characteristics. The control TFTs adjust the common electrode voltages locally in each sub-region to compensate for regional differences, achieving uniform voltage differences between pixel and common voltages across the entire display.
2Manufacturing precision
If control TFTs and control lines are added to each sub-region, then uniform voltage differences can be achieved across regions, but the device complexity increases
Solution Approach 1:
The control TFTs use the same structural configuration as the switching TFTs in the display substrate, allowing them to be fabricated using identical processes and materials. This multi-functionality approach reduces manufacturing complexity while achieving the desired voltage control capability.
Solution Approach 2:
The common electrode voltage control lines are integrated with the existing gate line structure, and the control TFTs are positioned to share process steps with the switching TFTs. This merging of control functions with existing structures minimizes the increase in device complexity.
Data Source
AI summary
A display substrate, a display device and a method for driving the same are provided. The display substrate includes a plurality of sub-regions. At least one subpixel unit, a common electrode voltage input line, a common electrode voltage control line and at least one control TFT are arranged at each sub-region. At each sub-region, a gate electrode of the control TFT is coupled to the common electrode voltage control line, a source electrode of the control TFT is coupled to the common electrode voltage input line, and a drain electrode of the control TFT is coupled to a common electrode of the subpixel unit.