Display Panel Driving Voltage Mapping for Flicker Reduction
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Solution Overview
Problem
Seamless Dynamic Refresh Rate Switching (SDRRS) technology in notebook computers causes significant brightness differences when switching between refresh rates, leading to flicker perception due to varying charging and discharging times, which is more noticeable in low grayscale states.
Innovation Solution
A method and device for a display panel that involves presetting a mapping database of voltage-refresh rate correlations, adjusting the refresh rate and voltage to match the new refresh rate, and adjusting the pixel driving voltage to reduce operating current, thereby minimizing brightness changes and flicker. This includes sending refresh rate and voltage adjustment instructions from the graphics processor to the timing controller and power driving chip, and using a specific formula to calculate the pixel driving voltage based on the Gamma voltage and color depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the image refresh rate is switched from 60 Hz to 40 Hz to reduce power consumption, then power consumption is reduced, but brightness increases and causes flicker perception
Solution Approach 1:
The patent changes the Gamma voltage parameter dynamically based on the refresh rate. When switching from 60Hz to 40Hz, the Gamma voltage is adjusted to modify the pixel driving voltage, thereby controlling the brightness output to compensate for the longer charging time at lower refresh rates and prevent flicker perception.
Solution Approach 2:
The patent preemptively adjusts the Gamma voltage before or during the refresh rate switch to counteract the expected brightness change. By pre-calculating the appropriate Gamma voltage from a mapping database and applying it to the pixel driving circuit, the system prevents flicker rather than correcting it after occurrence.
2Use of energy by moving object
If the image refresh rate is switched between 60 Hz and 40 Hz, then power consumption is optimized, but brightness difference causes flicker perception
Solution Approach 1:
The patent implements a feedback mechanism where the refresh rate adjustment triggers a corresponding Gamma voltage adjustment based on pre-established mapping relationships. The timing controller receives refresh rate change signals and automatically selects the appropriate Gamma voltage from the mapping database, creating a closed-loop control system that maintains brightness stability across different refresh rates.
Solution Approach 2:
The patent pre-establishes a mapping database containing optimal Gamma voltage values for different refresh rates before operation. This preliminary preparation allows the system to instantly retrieve and apply the correct Gamma voltage when refresh rate changes occur, without requiring real-time calculation or complex adjustments during the switching event.
3Illumination intensity
If the charging time is increased at 40 Hz refresh rate, then brightness increases, but flicker becomes more noticeable in low grayscale states
Solution Approach 1:
The patent applies different Gamma voltage adjustments depending on the specific operating conditions, particularly the grayscale level. The mapping database contains differentiated Gamma voltage values for various refresh rates and grayscale combinations, allowing the system to apply localized brightness compensation that is tailored to the current display state, making the adjustment more precise and effective.
Data Source
AI summary
The present disclosure provides a method and device for driving a display panel. The method includes steps of: presetting a mapping database of correspondence between each of first voltages and a respective one of image refresh rates; sending a refresh rate adjustment instruction to a timing controller; switching the image refresh rate from the first image refresh rate to the second image refresh rate according to the refresh rate adjustment instruction, and sending a voltage adjustment instruction to a power driving chip; obtaining the first voltage according to the voltage adjustment instruction and the mapping database; obtaining the pixel driving voltage according to the preset correspondence between the first voltage and the pixel driving voltage; and adjusting the display panel according to the pixel driving voltage to change the operating current of each pixel.