Bias Voltage Optimization for Display Flicker Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices experiencing flicker phenomena due to changes in transistor hysteresis characteristics when a constant voltage is applied at low refresh rates, necessitating a method to measure and calculate an optimal bias voltage to minimize flicker.
Innovation Solution
A system and method for setting a bias voltage that involves applying different levels of bias voltage to a display panel, measuring the corresponding flicker indices, calculating the change in flicker index, and selecting a pre-stored scenario to apply a third-level bias voltage, which is then fitted into a quadratic function to record the optimal bias voltage level that minimizes flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If a constant voltage is continuously applied to the transistor at low refresh rate, then power consumption is reduced, but the hysteresis characteristics of the transistor change causing flicker phenomenon
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the bias voltage level based on measured flicker indices. The system changes the voltage parameter from a fixed constant to an optimized variable value that minimizes flicker while maintaining low refresh rate operation, thus resolving the contradiction between power savings and image stability.
Solution Approach 2:
The patent implements feedback by measuring the flicker index at different bias voltage levels and using this information to determine the optimal bias voltage. The system continuously monitors the effect of bias voltage changes on flicker and adjusts accordingly, creating a closed-loop control that maintains image stability while consuming minimal power.
2Measurement precision
If multiple measurement points are used to determine optimal bias voltage, then measurement precision is improved, but the number of measurements required increases
Solution Approach 1:
The patent applies partial action by selecting only three specific bias voltage levels (first, second, and third levels) for measurement instead of requiring a comprehensive scan of all possible voltage levels. This partial sampling approach provides sufficient precision to determine the optimal bias voltage while significantly reducing the total number of measurements required, thus resolving the contradiction between measurement precision and time consumption.
Data Source
AI summary
Embodiments of the present disclosure provide a method for setting, by a computing device, a bias voltage of a driver integrated circuit that supplies voltage to a display panel. The method includes: selecting one of a plurality of pre-stored scenarios based on a change in a flicker index and applying a bias voltage to the display panel according to a level based on the selected scenario, and recording, to the driver integrated circuit, a level of the bias voltage which corresponds to a minimum value in a fitted quadratic function. According to a system and a method for setting the bias voltage according to embodiments of the present disclosure, the level of the bias voltage that minimizes the flicker phenomenon by minimizing a change in luminance of the display panel based on the bias voltage can be calculated through minimal measurements.