Dynamic Gamma Voltage Adjustment in Display Data Drivers
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Solution Overview
Problem
Display devices, particularly LCD and OLED devices, face issues with unnecessary power consumption and heat generation due to constantly fixed gamma voltages used in data drivers, which are inefficient and lead to increased energy expenditure.
Innovation Solution
A display device and driving method that incorporate a timing controller, data driver, gamma IC chip, power supply IC chip, and digital-to-analog converter (DAC) to dynamically adjust gamma voltages and most significant voltage based on histogram information from data signals, reducing power consumption and heat generation by optimizing voltage levels for each color component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If gamma voltages are constantly fixed in the data driver, then the data driver can simply convert digital data signals to analog data voltages, but unnecessary power is consumed and heat is generated
Solution Approach 1:
The patent implements dynamic voltage adjustment by replacing fixed gamma voltages with dynamically generated voltages based on histogram analysis of image data. The system analyzes the distribution of pixel values and adjusts gamma voltages in real-time to match actual image content, transforming the static voltage supply into a dynamic adaptive system that reduces power consumption while maintaining display quality
Solution Approach 2:
The patent changes the voltage parameters dynamically by adjusting gamma voltages according to histogram information. Instead of using constant voltage levels, the system modifies voltage parameters based on the statistical distribution of image data, allowing optimal voltage selection that minimizes power consumption for the actual displayed content
2Reliability
If gamma voltages are constantly fixed, then the gamma voltage generator and data driver operate continuously, but this causes heat generation
Solution Approach 1:
The patent implements periodic histogram analysis and voltage adjustment cycles. Instead of continuous operation, the system periodically analyzes image data distribution and updates gamma voltages accordingly, allowing the voltage generator and data driver to enter low-power states between adjustment cycles, thereby reducing heat generation while maintaining stable voltage supply
Solution Approach 2:
The patent introduces feedback mechanisms where histogram information from the displayed image is analyzed and used to adjust gamma voltages. This closed-loop system monitors the actual image content and dynamically optimizes voltage levels, reducing unnecessary power consumption and heat generation while maintaining display stability
Data Source
AI summary
A display device is disclosed. The device includes: a timing controller configured to derive data signals for a display panel from external signals; a date driver configured to derive data voltages from the data signals and apply the data voltage to data lines on the display panel; a gamma IC (integrated circuit) chip configured to apply gamma voltages to the data driver; a power supply IC chip configured to apply a most significant voltage to the data driver; a DAC (digital-to-analog converter) configured to receive the gamma voltages and the most significant voltage from the gamma IC chip and the power supply IC chip and generate the data voltages opposite to the data signals; and a power supply unit configured to convert the gamma voltages and the most significant voltage using the data signals and apply the converted voltages to the DAC.