Active Matrix Display Common Voltage Adjustment for Feed-Through Compensation
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Solution Overview
Problem
In active matrix display panels, the mismatch in resistance values of scanning lines made from different metal materials leads to fluctuations in feed-through voltages, resulting in poor image quality and increased manufacturing complexity due to the need for precise resistance control.
Innovation Solution
Adjusting common voltages applied to common electrodes in response to voltage changes when scanning lines transition from an on to an off state, ensuring a target voltage difference between pixel and common electrodes, thereby compensating for feed-through voltages without altering the panel's structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If two different metal materials are used for manufacturing scanning lines to reduce resistance difference, then the resistance mismatch between scanning lines is reduced, but the manufacturing process complexity increases and production yield decreases due to precise resistance control requirements
Solution Approach 1:
The patent changes the control parameter from manufacturing process parameters (line width, film thickness) to electrical parameters (common voltage adjustment). By adjusting the common voltage applied to common electrodes in response to detected voltage changes, the system compensates for feed-through voltage differences without requiring precise control of metal wiring resistance during manufacturing.
Solution Approach 2:
The patent implements a feedback mechanism where voltage changes of pixel electrodes are detected, and common voltages are adjusted accordingly. The common electrode driving circuit receives feedback information about voltage changes and dynamically adjusts common voltages to compensate for feed-through voltage differences, creating a closed-loop control system that maintains display quality without complex manufacturing controls.
2Manufacturing precision
If via-hole connections are used to connect scanning lines made of different metal materials, then the resistance of each scanning line can be controlled, but the manufacturing process complexity increases and production yield is affected
Solution Approach 1:
The patent extracts the resistance control function from the physical structure (via-hole connections, metal material selection) and relocates it to the electrical control domain (common voltage adjustment). This separation allows standard manufacturing processes to be used while achieving precise electrical characteristics through software/control algorithm rather than complex physical construction.
3Reliability
If resistance of scanning lines is strictly controlled in manufacturing, then feed-through voltage uniformity is improved, but manufacturing complexity increases and production yield decreases
Solution Approach 1:
The patent transitions from static resistance control (fixed during manufacturing) to dynamic voltage compensation (adjusted during operation). The common voltage is dynamically adjusted in response to detected voltage changes, allowing the system to adapt to manufacturing variations without requiring strict manufacturing tolerances, thereby maintaining high production yield while ensuring display quality.
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 approach reduces the complexity of the manufacturing process, improves production yield, and optimizes image quality by maintaining consistent gray scale displays across the panel.
Implementation Method 1
The pixel electrodes are coupled to the scanning lines through capacitive coupling
Data Source
AI summary
A method and apparatus for driving an active matrix display panel includes a plurality of scanning lines, a plurality of data lies intersecting the scanning lines, and a plurality of pixel electrodes that are coupled to the scanning lines and the data lines. The method includes activating the scanning lines sequentially, and adjusting common voltages applied to a plurality of common electrodes that are disposed opposite to the pixel electrodes in response to differences in voltage changes generated among the pixel electrodes when the scanning lines changes from an on state to an off state. Therefore a voltage difference between each of the pixel electrodes and a common electrode arranged opposite to the pixel electrode is equal to a target voltage.