Display Device Bias Voltage Tuning for VRR Flicker
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Solution Overview
Problem
Display devices operating in Variable Refresh Rate (VRR) mode experience flicker phenomena during low-speed operations, which affect image quality and power consumption.
Innovation Solution
The display device adjusts at least one of the level and application time of the bias voltage based on the refresh rate in the anode reset frame to reduce flicker, optimizing the bias voltage for the characteristics of the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display device operates in VRR mode with low refresh rates, then power consumption is reduced, but flicker phenomenon occurs affecting image quality
Solution Approach 1:
The bias voltage is dynamically adjusted based on the refresh rate in VRR mode. When operating at low refresh rates (e.g., 1Hz or 3Hz), the bias voltage level and/or application time is increased to compensate for the reduced refresh frequency, thereby suppressing flicker while maintaining power efficiency. This dynamic adaptation allows the system to optimize both power consumption and image quality across different operating conditions.
Solution Approach 2:
The patent changes the parameters of the bias voltage (level and application time) according to the refresh rate. By adjusting these parameters, the system能够有效 suppress flicker at low refresh rates without sacrificing power consumption benefits. Specifically, when the refresh rate is below a threshold, the bias voltage parameters are modified to prevent flicker, while at higher refresh rates, standard parameters are used to maintain power efficiency.
2Object-affected harmful factors
If the bias voltage is increased to reduce flicker, then image quality improves, but power consumption increases
Solution Approach 1:
Rather than continuously applying high bias voltage, the system dynamically adjusts the bias voltage application time and level based on the current refresh rate. At low refresh rates where flicker occurs, the bias voltage is applied for longer durations or at higher levels. At normal refresh rates, the bias voltage is reduced or applied less frequently, thereby maintaining image quality while minimizing power consumption.
Solution Approach 2:
The bias voltage is applied periodically with varying duration and intensity based on the refresh rate. In VRR mode at low refresh rates, the bias voltage application is synchronized with the refresh cycle, applying higher voltage or longer duration only when needed to suppress flicker, rather than maintaining constant high voltage levels.
3Object-affected harmful factors
If the refresh rate is increased to eliminate flicker, then image quality improves, but power consumption increases
Solution Approach 1:
Instead of increasing the refresh rate to eliminate flicker, the patent changes the bias voltage parameters (level and application time) to suppress flicker at the existing low refresh rate. This approach maintains the power consumption benefits of low refresh rates while effectively eliminating flicker through optimized bias voltage application.
Data Source
AI summary
Disclosed is a display device that reduces a flicker phenomenon that occurs in a low-speed operation in a Variable Refresh Rate (VRR) mode by tuning a bias voltage based on a refresh rate and supplying the tuned bias voltage to a display panel. The display device includes a display panel including a plurality of pixels; and a power supply for supplying a bias voltage and an anode reset voltage to the plurality of pixels, wherein when the display device operates in a VRR mode, the display device is configured to adjust at least one of a level and an application time of the bias voltage based on a refresh rate in an anode reset frame.