Liquid Crystal Display Frame Rate Control for Power Saving
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Solution Overview
Problem
Liquid Crystal Displays (LCDs) face high power consumption during normal operation due to constant frame rates, which are unnecessary in situations where video content is static or user interaction is low, leading to inefficiencies in power usage.
Innovation Solution
Implement a method where the frame rate is dynamically adjusted based on the video content and user interaction, decreasing the frame rate when a significant percentage of data voltages remain unchanged over time or when an idle event is detected, and reverting to the initial frame rate when activity resumes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Liquid Crystal Display operates at a constant high frame rate (60 Hz or 180 Hz) to ensure smooth display quality, then the display quality and responsiveness are maintained, but the power consumption increases due to frequent charging of liquid crystal capacitors
Solution Approach 1:
The patent applies dynamics by making the frame rate variable rather than constant. The system dynamically adjusts the frame rate based on detected idle events or manipulation events, switching between a first frame rate (lower) during idle periods and a second frame rate (higher) during active periods. This resolves the contradiction by allowing the display to maintain high quality when needed while reducing power consumption during static content display.
Solution Approach 2:
The patent changes the operational parameter of frame rate based on display conditions. When idle events are detected (indicating static content), the system switches to a lower frame rate to reduce capacitor charging frequency and power consumption. When manipulation events occur (indicating user interaction or content changes), the system switches to a higher frame rate to maintain display quality. This parameter adaptation resolves the contradiction between power consumption and display quality.
2Use of energy by moving object
If the frame rate is reduced to lower power consumption during idle periods, then power consumption decreases, but the display may exhibit flicker or reduced responsiveness
Solution Approach 1:
The patent employs feedback mechanisms through idle event detectors and manipulation event detectors that continuously monitor display conditions. When idle events are detected, the system feedbacks to reduce the frame rate for power savings. When manipulation events are detected (indicating potential flicker or user interaction), the system feedbacks to increase the frame rate, thereby preventing display instability while maintaining power efficiency during appropriate periods.
3Stability of the object's composition
If the Liquid Crystal Display maintains a constant frame rate to ensure consistent display performance, then the display performance is stable, but the charging frequency of liquid crystal capacitors remains high leading to unnecessary power consumption
Solution Approach 1:
The patent implements periodic action by alternating between different frame rates based on detected events. During idle periods, the system uses a lower frame rate with less frequent capacitor charging. When manipulation events occur, the system switches to a higher frame rate with more frequent charging. This periodic switching between operational states resolves the contradiction by matching the charging frequency to the actual display needs rather than maintaining constant high-frequency charging.
Data Source
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AI summary
The embodiments of the present invention disclose Liquid Crystal Display having low power consumption. Under the normal operation, a plurality of data voltages are inputted to a display panel having a constant frame rate, and an idle detecting step is performed to determine whether changes occur in the frame data voltages. When a percentage of the plurality of data voltages are unvaried after a specific period of time, the frame rate is reduced.