Display Device Gamma Voltage Ripple Compensation
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Solution Overview
Problem
Display devices experience deterioration in image quality due to ripples in the power voltage, which affect the output of buffer amplifiers and result in distorted gamma values, leading to inconsistent image grayscale.
Innovation Solution
A display device and driving method that include a gamma reference voltage generator, a gamma selection signal generator, and a gamma data supply unit, which calculate a representative power voltage value, compare it to gamma reference voltages, and adjust gamma data sets to maintain uniform image quality by differentially applying gamma voltages based on power voltage ripples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a power voltage is used as a source voltage for driving buffer amplifiers, then the display device can operate with simplified power supply, but power voltage ripples cause image quality deterioration and gamma value distortion
Solution Approach 1:
The patent introduces a gamma selection signal generator as an intermediary component that monitors power voltage ripples and selectively outputs appropriate gamma reference voltages to compensate for the ripples' harmful effects, thereby maintaining image quality while using a simplified power supply structure
Solution Approach 2:
The patent dynamically changes gamma reference voltage parameters based on detected power voltage ripple conditions. The gamma selection signal generator adjusts which gamma reference voltage is selected and output based on the magnitude and characteristics of power voltage ripples, thereby compensating for image quality deterioration
2Device complexity
If gamma reference voltages are generated using power voltage, then the circuit can be integrated, but power voltage fluctuations directly affect gamma value stability
Solution Approach 1:
The patent implements a feedback mechanism where the gamma selection signal generator continuously monitors the power voltage and its ripples, then uses this feedback information to selectively output gamma reference voltages that compensate for the detected fluctuations, maintaining gamma value stability despite power voltage variations
Solution Approach 2:
The patent prepares multiple gamma reference voltages in advance and stores them for selective output. By having pre-prepared gamma reference voltages corresponding to different power voltage ripple conditions, the system can quickly switch to the appropriate reference voltage without real-time calculation delays
3Device complexity
If a single gamma data set is used, then the data processing is simplified, but image quality varies under different power voltage conditions
Solution Approach 1:
The patent transitions from a static single gamma data set to a dynamic multi-gamma data set system. The gamma selection signal generator dynamically selects which gamma data set to output based on real-time power voltage ripple detection, enabling the system to adapt to varying power conditions while maintaining consistent image quality
Data Source
AI summary
A display device and a driving method thereof can reduce or prevent deterioration of image quality caused by ripples of a power voltage. A display device includes a gamma reference voltage generator generating a plurality of gamma reference voltages using a power voltage. A gamma selection signal generator generates a gamma selection signal corresponding to at least one gamma reference voltage among the gamma reference voltages and the power voltage. A gamma data supply unit stores a plurality of gamma data sets and outputs a gamma data set corresponding to the gamma selection signal from among the gamma data sets. A data driver generates a data signal using the gamma data set supplied from the gamma data supply unit and the gamma reference voltages. A display unit includes data lines transmitting the data signal.