Gamma Reference Voltage Generator Adaptive Bias Current Control
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Solution Overview
Problem
Display apparatuses face challenges in reducing power consumption while maintaining display quality, as increasing bias currents to improve display quality leads to higher power usage.
Innovation Solution
The display apparatus adaptively sets bias currents for gamma amplifiers based on preset luminance and grayscale values of input image data, using a configuration with minimum, middle, and maximum gamma amplifiers to generate gamma reference voltages, allowing for varied bias currents to optimize power usage without compromising display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bias currents of gamma amplifiers are increased to improve display quality, then display quality is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the bias currents of gamma amplifiers adjustable rather than fixed. The driving controller dynamically sets different bias current levels based on image characteristics (grayscale range, luminance requirements), allowing the system to adapt between high-quality mode (higher bias currents) and power-saving mode (lower bias currents) depending on actual display needs.
Solution Approach 2:
The patent changes the parameter of bias current levels across different gamma amplifiers. Specifically, it sets minimum, middle, and maximum bias current levels for different gamma amplifiers based on grayscale value ranges, enabling fine-grained control over power consumption while maintaining display quality where needed.
2Use of energy by moving object
If bias currents are reduced to save power, then power consumption is reduced, but charging rates become insufficient and display quality deteriorates
Solution Approach 1:
The patent applies local quality by differentiating bias current settings across different gamma amplifiers and different grayscale ranges. Instead of uniformly reducing all bias currents, it selectively applies lower bias currents only to gamma amplifiers handling specific grayscale ranges (e.g., middle grayscale values), while maintaining higher bias currents for critical ranges, thus preserving display quality locally where needed.
Solution Approach 2:
The patent uses partial action by applying reduced bias currents only to certain gamma amplifiers handling non-critical grayscale ranges, rather than reducing all bias currents uniformly. This partial reduction achieves power savings while maintaining sufficient charging rates for critical display quality requirements.
3Device complexity
If uniform bias currents are used for all gamma amplifiers, then circuit design is simplified, but power efficiency is reduced
Solution Approach 1:
The patent segments the gamma amplifiers into different groups (minimum, middle, maximum gamma amplifiers) with different bias current settings based on grayscale ranges. This segmentation allows differentiated power management across the gamma correction function, improving power efficiency while maintaining manageable circuit complexity through systematic organization.
Solution Approach 2:
The patent makes the driving controller universal by giving it the additional function of adaptively setting bias currents for multiple gamma amplifiers based on image characteristics. This multi-functionality enables the controller to optimize power consumption across different display scenarios without requiring separate dedicated circuits for each gamma amplifier.
Data Source
AI summary
A display apparatus includes a display panel, a gate driver, a data driver and a gamma reference voltage generator. The display panel is configured to display an image based on input image data. The gate driver is configured to output a gate signal to the display panel. The data driver is configured to output a data voltage to the display panel. The gamma reference voltage generator includes a plurality of gamma amplifiers having varied bias currents. The gamma reference voltage generator is configured to generate gamma reference voltages and to output the gamma reference voltages to the data driver.