Liquid Crystal Display Dynamic Refresh Rate Power Reduction
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Solution Overview
Problem
Current liquid crystal display (LCD) apparatuses consume excessive power due to fixed refresh rates, leading to unnecessary energy consumption, especially in portable devices, despite efforts like polarity inversion driving methods and area scanning backlight techniques, which have limited effectiveness.
Innovation Solution
A liquid crystal display apparatus with a dynamic adjustable refresh rate, utilizing a dual-TFT driving circuit and storage capacitors, adjusts display refresh rates based on image characteristics, such as dynamic or static content, to reduce power consumption, and incorporates a dynamic frequency adjustment unit to generate display mode control signals, ensuring low refresh rates without compromising display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed refresh rate of 50-70 Hz is used, then the display can maintain stable image quality, but the power consumption increases due to unnecessary periodic refreshing even when the display content does not change
Solution Approach 1:
The patent implements dynamic refresh rate adjustment by detecting whether the display content has changed between frames. When content remains static, the refresh rate is reduced or suspended; when content changes, the refresh rate increases accordingly. This dynamic adaptation resolves the contradiction by making the refresh rate flexible rather than fixed, maintaining display stability only when necessary while reducing power consumption during static periods.
Solution Approach 2:
The system changes the operational parameter (refresh rate) based on display content characteristics. By monitoring content changes and adjusting the refresh rate parameter dynamically, the system achieves both low power consumption during static content and stable display quality during content transitions, effectively resolving the trade-off between reliability and energy usage.
2Use of energy by moving object
If the refresh rate is reduced to save power, then energy consumption decreases, but the storage capacitor potential changes over time causing transmittance variations and display uniformity issues
Solution Approach 1:
The patent employs dynamic refresh rate adjustment that adapts to content characteristics. By intelligently determining when content has changed and only refreshing at necessary intervals, the system minimizes the duration of low refresh rate operation, thereby limiting capacitor potential drift while still achieving significant power savings during extended static periods.
Solution Approach 2:
The system incorporates content change detection as a feedback mechanism. By continuously monitoring whether display content has changed and using this information to adjust the refresh rate, the system creates a closed-loop control that prevents excessive capacitor potential variation while maximizing power savings, thus resolving the contradiction between energy efficiency and display uniformity.
3Use of energy by moving object
If a low refresh rate is used, then power consumption is reduced, but phenomena of scintillation and screen flicker occur due to transmittance changes over time
Solution Approach 1:
The patent implements dynamic refresh rate adjustment that responds to content changes. By maintaining higher refresh rates during content transitions and reducing them only during static periods, the system minimizes the occurrence of flicker and scintillation while achieving power savings during stable display periods, effectively resolving the contradiction between energy consumption and visual quality.
Solution Approach 2:
The system dynamically changes the refresh rate parameter based on detected content characteristics. This parameter adaptation ensures that low refresh rates (which cause flicker) are applied only when necessary for power savings, while maintaining higher rates during content changes to prevent visible artifacts, thus resolving the trade-off between power consumption and harmful visual effects.
Data Source
AI summary
The invention discloses a liquid crystal display apparatus and a pixel element design thereof. The liquid crystal display apparatus includes a register, a liquid crystal display panel, a driving circuit, a dynamic frequency adjustment unit and a control circuit. The liquid crystal display panel includes a plurality of liquid crystal capacitors and a plurality of pixel units. The driving circuit includes a plurality of storage capacitors corresponding to the liquid crystal capacitors. A capacitance of the storage capacitors far exceeds a capacitance of the liquid crystal capacitors. The driving circuit casts the image information on the liquid crystal display panel. The dynamic frequency adjustment unit computes and judges based on an image characteristic classification of the image information, so as to generate a display mode control signal dynamically.