Data Driver Flicker Compensation for Electroluminescent Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Variable refresh rate (VRR) technology in electroluminescent display apparatuses can cause luminance deviations and flickers when the refresh rate changes, leading to reduced display quality due to differences in data refresh periods.
Innovation Solution
The electroluminescent display apparatus adjusts the level of flicker compensation data voltage based on the data refresh period, using a data driver to output specific voltages in refresh and anode reset frames, ensuring consistent luminance by varying the weight of the data voltage across different refresh rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If variable refresh rate technology is used to decrease power consumption, then power consumption is reduced, but luminance deviation and flicker occur at refresh rate changes
Solution Approach 1:
The patent applies preliminary action by introducing an anode reset frame between the first and second refresh frames. This intermediate frame performs a preliminary reset of the anode voltage to a reference level before the actual data refresh, ensuring that the pixel circuit is in a known state. This prevents luminance deviation and flicker by eliminating accumulated charge effects that would otherwise occur during variable refresh rate transitions, while still maintaining the power savings benefits of VRR.
2Use of energy by stationary object
If data refresh period is lengthened to decrease power consumption, then power consumption is reduced, but flicker is recognized and display quality is reduced
Solution Approach 1:
The anode reset frame serves as an intermediary between the first refresh frame and the second refresh frame. It acts as a mediator that bridges the gap created by the extended refresh period, providing a controlled transition state where the anode voltage is reset to a reference level. This intermediary frame eliminates the harmful flicker effect by ensuring smooth voltage transitions, while allowing the overall refresh period to remain extended for power consumption reduction.
3Reliability
If flicker compensation data voltage is output in second refresh frame, then flicker is compensated, but additional voltage output and control complexity are required
Solution Approach 1:
The patent segments the refresh process into distinct temporal phases: the first refresh frame, the anode reset frame, and the second refresh frame. By dividing the refresh operation into these separate segments, the system can independently control and optimize each phase. The anode reset frame is dedicated solely to voltage reset, while the refresh frames handle data updates, simplifying the control logic for flicker compensation compared to a monolithic refresh approach.
Data Source
AI summary
An electroluminescent display apparatus can include a display panel including at least one pixel; and a data driver configured to output a data voltage of a first gray level to the at least one pixel in a first refresh frame, output a flicker compensation data voltage to the at least one pixel in a second refresh frame, and output an anode reset voltage to the at least one pixel in at least one anode reset frame arranged between the first refresh frame and the second refresh frame, in which the anode reset voltage is a voltage for turning off a light emitting device included in the at least one pixel, and the flicker compensation data voltage is generated based on applying a weight to a data voltage of a second gray level.