Gamma Voltage Control for Low-Power Display Image Quality
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Solution Overview
Problem
Display devices consume significant power due to the use of gamma voltages, which when lowered for power conservation, adversely impact image quality and user experience.
Innovation Solution
A display device that varies the magnitude of the gamma power voltage based on image luminance, using a power control signal to adjust gamma voltages and data voltages, incorporating a storage device for black and white data voltage information, and a timing controller to generate power and gamma control signals, ensuring consistent data voltage selection across varying luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gamma voltages are used to generate data voltages for driving pixels, then image quality and display performance are maintained, but power consumption increases significantly
Solution Approach 1:
The patent implements dynamic voltage adjustment by varying the gamma power voltage level according to the luminance characteristics of the input image. The timing controller analyzes image luminance and dynamically selects appropriate gamma power voltage levels, making the system adaptive rather than static. This resolves the contradiction by allowing the system to use higher voltages only when necessary for high-luminance images while using lower voltages for low-luminance images, maintaining image quality when needed while reducing power consumption when possible.
Solution Approach 2:
The patent changes the voltage parameter dynamically based on image luminance characteristics. Multiple gamma power voltage levels are prepared, and the appropriate level is selected based on the input image's luminance. This parameter change approach allows the system to optimize the balance between power consumption and image quality by matching voltage levels to actual display requirements rather than using a fixed high voltage level.
2Use of energy by moving object
If gamma power voltage level is reduced to conserve power, then power consumption decreases, but image quality and user experience are significantly impacted
Solution Approach 1:
The patent prepares multiple gamma power voltage levels and dynamically selects the appropriate level based on image luminance characteristics. When the input image has low luminance requirements, a lower gamma power voltage level is selected to reduce power consumption. When high luminance is required, a higher voltage level is selected to maintain image quality. This parameter selection strategy resolves the contradiction by adapting the voltage level to actual display needs rather than using a fixed low voltage level.
Solution Approach 2:
The timing controller dynamically adjusts the gamma power voltage level based on real-time analysis of image luminance characteristics. This dynamic adjustment ensures that the voltage level is optimized for each specific image rather than using a static low voltage setting, thereby maintaining image quality when necessary while reducing power consumption when possible.
3Reliability
If a fixed high gamma power voltage is used, then image quality is consistently maintained, but power consumption is high even for low-luminance images
Solution Approach 1:
The patent replaces the fixed high voltage approach with a dynamic voltage selection mechanism. The timing controller analyzes the luminance characteristics of each input image and selects the appropriate gamma power voltage level from multiple available levels. This dynamic approach maintains high image quality when high-luminance images are displayed while reducing power consumption when low-luminance images are displayed, resolving the contradiction between consistent quality and variable power requirements.
Solution Approach 2:
Instead of always applying the full high voltage level, the patent applies only the necessary voltage level required for the specific image luminance requirements. This partial action approach uses the minimum necessary voltage to achieve the desired image quality, avoiding the excessive power consumption that would result from always using the highest voltage level.
Data Source
AI summary
A display device includes a display unit including pixels, a power supply for generating a gamma power voltage, based on a power control signal, a gamma voltage generator for generating gamma voltages, based on a gamma control signal, and a data driver for generating a data voltage corresponding to a grayscale value included in image data, using the gamma voltages, and providing the data voltage to the pixels. A voltage level of the gamma power voltage varies according to a luminance of an input image corresponding to the image data.