Emission Control Driver Circuit Prevents Display Flickering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic EL display devices face flickering issues when changing the number of light emissions per frame period, leading to perceived luminance differences that cause display screen flickering, despite efforts to maintain consistent power consumption and display luminance.
Innovation Solution
A display device configuration with scanning lines, data lines, emission control lines, and pixel circuits, where an emission control line driver circuit adds sequential delays to control signals, allowing for transition frame periods with different emission proportions to adjust luminance and prevent flickering during changes in the number of light emissions per frame period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the number of light emissions per frame period is changed to prevent flickering, then power consumption can be maintained, but display screen flickering occurs due to perceived luminance differences
Solution Approach 1:
The patent applies preliminary action by introducing transition frame periods before changing the number of light emissions. These transition frames gradually adjust the emission proportion to prepare the observer's visual system for the upcoming change, preventing the perception of flicker when the emission count changes between leading and trailing frame periods
Solution Approach 2:
The patent employs periodic action by using a cyclic pattern of leading frame periods, transition frame periods, and trailing frame periods. This periodic structure with different emission proportions creates a rhythm that masks the flickering effect, allowing the display to change emission counts while maintaining perceived luminance stability
2Reliability
If a frame rate higher than 60 Hz is employed to reduce afterimages and prevent flickering, then display quality improves, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the number of light emissions per frame period variable rather than fixed. The display can dynamically adjust between different emission counts (e.g., 1, 2, or 3 emissions per frame) depending on the content being displayed, allowing optimization of both display quality and power consumption for different usage scenarios
Data Source
AI summary
In a display device that changes the number of light emissions per frame period, a display control circuit outputs a control signal specifying an emission period included in a frame period to an emission control line driver circuit. The emission control line driver circuit adds sequential delays to the control signal and thereby generates signals to be applied to the emission control lines. When leading and trailing frame periods have the same proportion of emission periods but include different numbers of emission periods, the leading and trailing frame periods are intervened by a transition frame period having a different proportion of emission periods from the leading frame period. This configuration prevents flickering caused by the changing of the number of light emissions per frame period.