Display Panel Compensation Voltage During Blanking for VRR
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Solution Overview
Problem
Existing display panels experience leakage current during the vertical blanking stage, which affects display quality when the refresh frequency is low, especially with Variable Refresh Rate (VRR) functions.
Innovation Solution
A display panel design that outputs compensation voltage during the vertical blanking stage, where the voltage value of the compensation voltage is adjusted relative to the display voltage to counteract leakage current, thereby maintaining image brightness and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Variable Refresh Rate (VRR) function is implemented to dynamically adjust refresh rate, then image smoothness and tearing issues are improved, but leakage current during vertical blanking stage increases affecting display quality
Solution Approach 1:
The patent converts the harmful leakage current during vertical blanking stage into a beneficial effect by applying a compensation voltage that has the same polarity as the display voltage. This compensation voltage, applied during the vertical blanking period, actually utilizes the otherwise wasted time to counteract the leakage current's negative effects, thereby maintaining pixel electrode voltage and improving display quality while preserving VRR benefits
Solution Approach 2:
The patent changes the voltage parameter during vertical blanking stage by applying a compensation voltage with the same polarity as the display voltage, rather than maintaining zero or opposite polarity. This parameter change compensates for the voltage drop caused by leakage current, ensuring stable pixel electrode voltage across different refresh rates
2Use of energy by stationary object
If vertical blanking stage duration is extended to support lower refresh rates, then power consumption is reduced, but leakage current accumulation increases degrading display quality
Solution Approach 1:
The patent transforms the extended vertical blanking stage, which normally causes harmful leakage current accumulation, into a beneficial period for compensation. By applying compensation voltage with the same polarity as display voltage during this extended period, the system maintains pixel electrode voltage stability while enjoying lower power consumption from reduced refresh rates
Solution Approach 2:
The patent applies compensation voltage during the vertical blanking stage before the next display period begins, preliminarily counteracting the leakage current effects. This preliminary action ensures that when the next frame's display voltage is applied, the pixel electrode is already compensated, maintaining display quality without requiring longer compensation periods
Data Source
AI summary
A display panel and an electronic device are provided by the present application. In the image display period of at least one frames under the first preset refresh mode, during the display period, the data line is configured to output display voltage to the pixel unit, during the vertical blanking stage, the data line is configured to output compensation voltage to the pixel unit. When the display voltage is a positive polarity voltage, a voltage value of the display voltage is less than a voltage value of the compensation voltage, when the display voltage is a negative polarity voltage, the voltage value of the display voltage is greater than the voltage value of the compensation voltage.