Gamma Voltage Generator Dynamic Adjustment for LCD Power Savings
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Solution Overview
Problem
Liquid crystal display (LCD) devices consume significant power, especially when displaying frames with high contrast ratios, which is not necessary in everyday usage scenarios like web browsing or word processing, leading to inefficient power usage.
Innovation Solution
A gamma voltage generator that adjusts gamma voltages based on the difference in image properties of frames to be displayed, using a voltage divider circuit with a switch and resistors to control the connection between reference voltage generators, reducing power consumption by either retaining or reducing gamma voltages as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If gamma voltage is maintained at high level for high contrast ratio display, then display quality is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic adjustment of gamma voltage based on frame characteristics. The system analyzes whether the current frame requires high contrast ratio display and dynamically switches between high gamma voltage (for quality) and low gamma voltage (for power saving), making the display system adaptive rather than static
Solution Approach 2:
The patent changes the gamma voltage parameter according to frame properties. By detecting frame characteristics and adjusting the gamma voltage parameter accordingly, the system optimizes the balance between display quality and power consumption for different content types
2Use of energy by moving object
If gamma voltage is reduced to save power, then power consumption is reduced, but display quality deteriorates
Solution Approach 1:
The patent applies different gamma voltage levels to different frames based on their specific characteristics. Instead of uniformly reducing gamma voltage for all frames, the system selectively applies high voltage only when needed for specific frame types, maintaining local quality where necessary while saving power overall
Solution Approach 2:
The patent dynamically changes the gamma voltage parameter based on frame analysis results. The system adjusts this critical display parameter in real-time to match content requirements, ensuring quality is maintained when needed while enabling power savings when possible
3Use of energy by moving object
If gamma voltage is continuously adjusted, then power consumption is optimized, but device complexity increases
Solution Approach 1:
The patent segments the control approach by categorizing frames into different types based on their characteristics. This segmentation allows the system to apply simplified control rules for each category rather than continuous complex adjustment, reducing overall system complexity while maintaining optimization effectiveness
Solution Approach 2:
The system performs self-analysis of frame characteristics and automatically determines the appropriate gamma voltage level without requiring external intervention or complex external control mechanisms. This self-service capability simplifies the overall control architecture
Data Source
AI summary
The present invention discloses a gamma voltage generator of a display driving device. The gamma voltage generator comprises a first reference voltage generator; a switch coupled to the first reference voltage generator; and a plurality of resistors connected in serial and coupled to the switch; wherein the switch controls a connection between the first reference voltage generator and the plurality of resistors.