Array Substrate Signal Inversion for LCD Power Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal displays with DC common voltage signals require a large output voltage swing for data voltage signals, leading to increased power consumption during charging and discharging of storage capacitors.
Innovation Solution
An array substrate with a common voltage generation unit, data voltage generation unit, timing control unit, and switch control units that switch signals between data lines and common voltage lines to reduce the output voltage swing while maintaining polarity reversion of liquid crystal molecules, using metal oxide semiconductor field effect transistors for efficient switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a DC common voltage signal is used, then the polarity reversion requirements of liquid crystal molecules can be met, but the output voltage swing of data voltage signal increases and power consumption increases
Solution Approach 1:
The patent applies inversion by switching the connection roles of data lines and common voltage lines between frames. In even frames, data lines connect to pixel electrodes while common voltage lines connect to storage capacitors. In odd frames, this connection is reversed. This inversion strategy allows the use of DC common voltage signals while maintaining polarity reversion of liquid crystal molecules, thereby reducing power consumption without sacrificing display reliability.
2Reliability
If the output voltage swing of data voltage signal is increased, then polarity reversion requirements can be met with DC common voltage signal, but power consumption during charging and discharging of storage capacitor increases
Solution Approach 1:
The patent implements inversion by alternating the functional connections between data lines and common voltage lines for different frames. This allows the system to use DC common voltage signals with reduced voltage swing while still achieving the necessary polarity reversion effect, thereby minimizing energy loss during capacitor charging and discharging cycles.
Solution Approach 2:
The patent changes the parameter of common voltage signal from AC to DC, and reduces the voltage swing range. By using DC common voltage with smaller amplitude and alternating the connection configuration between frames, the system achieves polarity reversion with lower energy consumption compared to using AC signals or DC signals with large voltage swing.
3Use of energy by moving object
If AC common voltage signal is used, then polarity reversion can be achieved with smaller voltage swing, but the system loses flexibility in handling DC signal requirements
Solution Approach 1:
The patent implements multi-functionality by enabling the common voltage line to serve dual purposes: it can provide DC voltage with reduced swing for power efficiency, while through the switching mechanism, it can also effectively provide AC-like polarity reversal functionality. This universal approach allows the system to adapt to different signal requirements and optimize for low power consumption while maintaining versatility.
Data Source
AI summary
The invention discloses an array substrate and a driving method thereof, and a display device, and the array substrate includes: a common voltage generation unit, a timing control unit, a data voltage generation unit, a switch control unit and pixel units, wherein the switch control unit is connected to the common voltage generation unit, the timing control unit, the data voltage generation unit, the common voltage line and the data line, and the switch control unit is used to load a common voltage signal on the common voltage line and load a data voltage signal on the data line when a current frame of image is displayed, and load the common voltage signal on the data line and load the data voltage signal on the common voltage line when a next frame of image is displayed.