Gamma Reference Voltage Control for Low-Power Display Driving
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Solution Overview
Problem
Existing display technologies face challenges in balancing display quality and power consumption due to the fixed bias current settings of gamma amplifiers, leading to either insufficient pixel charge or increased power consumption.
Innovation Solution
A display apparatus with multiple gamma amplifiers having different bias currents, adjusted based on the gamma voltage range and luminance levels, allowing for dynamic adjustment of bias currents on a frame-by-frame basis to optimize power consumption without compromising display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the bias current of the gamma amplifier is set low, then power consumption is reduced, but display quality deteriorates due to insufficient pixel charge
Solution Approach 1:
The patent applies dynamics by making the bias current adjustable rather than fixed. The gamma amplifier's bias current is dynamically changed based on the gamma voltage range and luminance requirements of different frames, allowing the system to adapt between low power consumption and sufficient pixel charge generation as needed.
Solution Approach 2:
The patent changes the parameter of bias current based on different operating conditions. By selecting different bias currents (first, second, or third bias currents) corresponding to different gamma voltage ranges and luminance levels, the system optimizes both power consumption and display quality for each specific frame.
2Reliability
If the bias current of the gamma amplifier is set high, then display quality is maintained with sufficient pixel charge, but power consumption increases
Solution Approach 1:
The system dynamically adjusts the bias current based on the actual display requirements of each frame. Instead of maintaining a high bias current continuously, the system switches between different bias current levels depending on the gamma voltage range and luminance needs, thereby reducing overall power consumption while maintaining display quality when necessary.
Solution Approach 2:
The patent implements parameter changes by selecting appropriate bias currents based on the gamma voltage range and luminance level. The system changes the bias current parameter from high to low or intermediate levels depending on whether sufficient pixel charge is required, thus optimizing the trade-off between display quality and power consumption.
3Device complexity
If a fixed bias current is used for all frames, then the circuit design is simple, but the system cannot adapt to different gamma voltage ranges and luminance requirements
Solution Approach 1:
The patent introduces dynamics to the bias current control by enabling frame-by-frame adjustment based on gamma voltage range and luminance requirements. This dynamic adjustment mechanism, while adding some control complexity, significantly improves the system's adaptability to different display conditions without requiring complete circuit redesign.
Solution Approach 2:
The system implements parameter changes by allowing the bias current to vary based on the gamma voltage range and luminance level of each frame. This approach maintains relatively simple circuit design while achieving high adaptability through controlled parameter adjustment rather than structural complexity.
Data Source
AI summary
A display apparatus includes: a display panel including a pixel and configured to display an image based on input image data; a gate driver configured to output a gate signal to the pixel; a data driver configured to output a data voltage to the pixel; and a gamma reference voltage generator including a gamma bias circuit configured to generate a bias current based on a gamma voltage range which is from a voltage level corresponding to a zero grayscale to a voltage level corresponding to a setting luminance and a gamma amplifying circuit configured to receive the bias current, the gamma reference voltage generator being configured to generate gamma reference voltages and to output the gamma reference voltages to the data driver.