Variable Frame Display Gamma Voltage Control
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Solution Overview
Problem
In display devices operating in variable frame mode, the increased duration of the blank period leads to leakage current and deterioration of luminance and image quality due to frame rate mismatch, which existing technologies fail to adequately address.
Innovation Solution
A display device with a controller that initializes and changes the gamma reference voltage based on threshold times during the blank period, ensuring the gamma reference voltage corresponds to the current frame rate, thereby reducing luminance deterioration and frame latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the blank period duration is increased to support variable frame mode, then frame rate synchronization is improved, but leakage current increases causing luminance deterioration
Solution Approach 1:
The patent applies dynamics by making the gamma reference voltage adjustable and time-dependent. Instead of using a fixed gamma reference voltage, the system dynamically adjusts the voltage level based on the actual blank period duration. When the blank period exceeds a threshold, the gamma reference voltage is modified to compensate for leakage current effects, thereby maintaining luminance quality while supporting variable frame rates.
Solution Approach 2:
The patent changes the parameter of gamma reference voltage based on blank period duration. By monitoring how long the blank period lasts and adjusting the gamma reference voltage accordingly, the system compensates for the increased leakage current that occurs during extended blank periods. This parameter change approach allows the display to maintain image quality across different frame rates.
2Adaptability or versatility
If the blank period duration is increased to support variable frame mode, then variable frame rate display is enabled, but image quality deteriorates
Solution Approach 1:
The system dynamically adjusts the gamma reference voltage based on the actual blank period duration. By making the voltage adjustment time-dependent, the system maintains precise control over pixel voltage levels even when the blank period varies, thereby preserving image quality across different frame rates.
Solution Approach 2:
The patent implements a feedback mechanism where the system monitors the blank period duration and uses this information to adjust the gamma reference voltage. This closed-loop approach ensures that the gamma reference voltage is optimized for the current blank period length, maintaining image quality while supporting variable frame rates.
3Illumination intensity
If the gamma reference voltage is changed during blank period, then luminance deterioration is reduced, but additional control complexity is introduced
Solution Approach 1:
The patent applies preliminary action by initializing the gamma reference voltage at the start of the blank period based on the expected frame rate. This pre-adjustment approach allows the system to prepare the appropriate voltage level before the active period begins, simplifying the control logic while maintaining luminance quality.
Solution Approach 2:
The system performs periodic adjustment of the gamma reference voltage at the beginning of each blank period. By resetting and adjusting the voltage periodically rather than continuously, the patent reduces control complexity while still addressing luminance deterioration caused by extended blank periods.
Data Source
AI summary
A display device includes a display panel comprising a plurality of pixels, a data driver configured to generate data voltages based on a gamma reference voltage, and to provide the data voltages to the plurality of pixels, a gate driver configured to provide gate signals to the plurality of pixels, and a controller configured to control the data driver and the gate driver. The controller is configured to initialize the gamma reference voltage when a blank period starts in a frame period comprising an active period and the blank period, and to change the gamma reference voltage when a duration of the blank period reaches at least one threshold time.