Pixel Circuit Static Display Power Reduction
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Solution Overview
Problem
Liquid crystal display apparatuses have high overall power consumption while displaying static pictures due to maintaining a relatively high charging frequency of gate lines, which is similar to that of dynamic pictures.
Innovation Solution
A pixel circuit with a data write device, liquid crystal capacitor, and power supply device, where the data write device writes data voltage under gate scanning signals in normal display stages, and the power supply device charges the liquid crystal capacitor with a charge control signal in static display stages, reducing the need for gate line scanning and thus lowering power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gate lines are scanned at high frequency to display static pictures, then picture update is maintained, but overall power consumption increases
Solution Approach 1:
The patent applies dynamics by transitioning from static high-frequency gate scanning to dynamic low-frequency scanning combined with automatic capacitor charging. The system adapts its operating mode based on whether the display shows static or dynamic content, using a lower scanning frequency for static pictures while compensating through automated capacitor charging to maintain picture quality.
Solution Approach 2:
The patent changes the operating parameters by reducing the gate line scanning frequency from high frequency (used for dynamic pictures) to low frequency (used for static pictures). This parameter change is enabled by the automatic charging mechanism that compensates for the reduced scanning frequency, thereby reducing power consumption while maintaining display stability.
2Use of energy by moving object
If gate line scanning frequency is reduced for static pictures, then power consumption decreases, but capacitor voltage may not be maintained
Solution Approach 1:
The patent implements self-service through the automatic charging mechanism that monitors and maintains the liquid crystal capacitor voltage without requiring continuous high-frequency gate scanning. The system self-regulates by charging the capacitor through the power supply device when in static display mode, eliminating the need for external intervention to maintain voltage stability.
Solution Approach 2:
The patent employs feedback through the control signal output device that monitors the display state and automatically triggers the power supply device to charge the liquid crystal capacitor. This feedback mechanism ensures that the capacitor voltage is maintained at appropriate levels even when gate line scanning frequency is reduced, thereby preventing voltage instability.
3Use of energy by moving object
If low frequency scanning is used for static pictures, then power consumption is reduced, but picture refresh rate decreases
Solution Approach 1:
The patent applies preliminary action by charging the liquid crystal capacitor in advance during static display periods. The power supply device charges the capacitor before the next scanning cycle, ensuring that the capacitor is fully charged and ready for the next picture display. This preliminary charging action allows the system to use lower scanning frequencies while maintaining picture quality.
Solution Approach 2:
The patent uses periodic action through the cyclic charging of the liquid crystal capacitor by the power supply device. The capacitor is charged periodically at intervals determined by the low-frequency scanning schedule, maintaining sufficient voltage levels for picture display. This periodic charging enables the system to operate at lower frequencies while still providing adequate picture refresh.
Data Source
AI summary
The present invention provides a pixel circuit and a driving method therefor, a display panel and a display apparatus, the pixel circuit comprises a data write device, a liquid crystal capacitor, a power supply device and a control signal output device, the data write device writes a data voltage of a data line to a first terminal of the liquid crystal capacitor in a normal display stage; the control signal output device acquires the data voltage and generates a corresponding charge control signal in accordance with the acquired data voltage in the normal display stage, and transmits the charge control signal to the power supply device in a static display stage; the power supply device charges the liquid crystal capacitor in accordance with the charge control signal, till the voltage difference between the first terminal and the second terminal of the liquid crystal capacitor becomes Vdata−Vcom.