Liquid Crystal Display Panel Common Electrode Voltage Control
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Solution Overview
Problem
Conventional liquid crystal display panels face high power consumption and signal interference due to the need for significant voltage variations and parasitic capacitive coupling between rows, especially in portable devices.
Innovation Solution
The implementation of a liquid crystal display panel with common electrode controller units that manage voltage levels and voltage buffer circuits to reduce data voltage variation amplitude and prevent signal interference between rows during non-writing periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DC common voltage driving is used with constant voltage on common electrode, then polarity inversion can be realized, but data voltage requires large variation range between positive and negative levels causing high power consumption and slow charging conversion speed
Solution Approach 1:
The patent changes the voltage parameter of the common electrode from constant DC voltage to AC voltage that alternates between positive and negative levels. This parameter change enables polarity inversion driving while reducing the voltage variation range required for data signals, thereby reducing power consumption and improving charging speed.
2Use of energy by moving object
If AC common voltage driving is used to reduce data voltage variation range, then power consumption is reduced, but signal interference between rows still occurs through parasitic capacitors
Solution Approach 1:
The patent introduces common electrode controller units as intermediary components between the common electrode lines and voltage sources. These controllers independently manage the voltage signals on each common electrode line, enabling precise control that prevents signal interference between rows while maintaining AC voltage driving benefits.
Solution Approach 2:
The patent segments the common electrode control system into multiple independent common electrode controller units, each managing a specific common electrode line. This segmentation allows independent voltage control for each row, preventing parasitic capacitor coupling from causing interference between adjacent rows.
3Object-affected harmful factors
If multiple common electrode lines are used for different rows, then signal interference between rows is prevented, but device complexity increases
Solution Approach 1:
The patent segments the display panel into multiple independent row units, each with its own common electrode line and controller unit. This segmentation isolates electrical signals between rows, preventing interference through parasitic capacitors while maintaining manageable complexity through modular design.
Data Source
AI summary
A liquid crystal display panel and a display driving method are disclosed. The liquid crystal display panel includes data lines, scan lines, common electrode lines, pixel units, voltage buffer circuits and common electrode controller units. The pixel units are coupled to corresponding data lines and scan lines. Each pixel unit includes a storage capacitor. The pixel units on the same row are coupled to the same common electrode line. The common electrode controller units drive the common electrode lines to re-charge each pixel unit via the storage capacitor. The voltage buffer circuits are coupled between the common electrode controller units and the common electrode lines. The voltage buffer circuits are used for maintaining the voltage levels on each of the common electrode lines when each of the pixel units is not in their data writing period.