Sub-Pixel Emission Timing for Flicker-Free Ultra-Low-Frequency Displays
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Solution Overview
Problem
Display devices face a trade-off between display performance and endurance performance, with high display performance increasing power consumption and compromising endurance, and ultra-low frequency causing flicker issues.
Innovation Solution
A display device with a gate driver and emission driver that includes multiple sub-pixels, utilizing a first and second gate driving unit and a light-emitting control signal to manage display periods with a ratio of light-emitting control signal periods exceeding the critical flicker frequency, and synchronized scan signals to switch sub-pixels between display and non-display states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high display performance is enabled, then display quality is improved, but power consumption increases and endurance is reduced
Solution Approach 1:
The patent applies periodic action by implementing a display refresh mechanism that periodically updates sub-pixel states at frequencies above the critical flicker frequency (typically 60Hz or higher). The emission driver controller alternates between writing new frame data and holding/refreshing existing data, creating periodic light emission cycles that maintain perceived display quality while enabling power management strategies such as lowering refresh rate during static content display or reducing emission intensity in non-critical areas.
2Object-affected harmful factors
If display refresh rate is increased, then flicker perception is reduced, but power consumption increases
Solution Approach 1:
The patent employs parameter changes by dynamically adjusting the light-emitting control signal frequency and duty cycle based on display content characteristics and viewer conditions. The system can modify the ratio of writing frames to holding frames, change the duration of light emission versus non-emission periods, and adjust the intensity levels during different phases of the refresh cycle. This allows maintaining flicker-free display at lower average power consumption by reducing emission intensity or duration when full brightness is not required.
Data Source
AI summary
The present application provides a display device, which includes a display panel, a gate driver, and an emission driver. In a first duration corresponding to a writing frame and each holding frame, a ratio of number of periods of a light-emitting control signal to a first duration is greater than a critical flicker frequency. A valid pulse of the first scan signal corresponds to an invalid pulse of the light-emitting control signal, and a valid pulse of the second scan signal is located within a duration of the invalid pulse in the first period of the light-emitting control signal corresponding to the writing frame.