Data Driving Circuit Reset Voltage for Low-Speed Display Flicker
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Solution Overview
Problem
Display devices driven in low-speed mode experience visible flickers due to increased luminance differences between frames, which degrade image quality and increase power consumption.
Innovation Solution
A data driving circuit that periodically supplies a reset voltage in the holding interval, matching the luminance waveform of the refresh interval, and adjusts the reset voltage based on the driving voltage level to maintain consistent luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display device is driven at a lower frequency in low-speed mode, then power consumption is reduced, but luminance decreases over time within a frame period causing visible flicker
Solution Approach 1:
The patent applies periodic action by introducing a reset voltage signal that is periodically applied to the data line during the holding interval. This periodic reset action replenishes the voltage level that has decreased due to the long frame period in low-speed mode, thereby maintaining consistent luminance while allowing the display to operate at lower frequencies for reduced power consumption.
Solution Approach 2:
The patent changes the voltage parameter by applying a reset voltage with a specific level (higher than the data voltage level) during the holding interval. This parameter change compensates for the voltage decay that occurs over the extended frame period, ensuring that the luminance remains consistent throughout the display refresh cycle in low-speed mode.
2Productivity
If the frame period is extended in low-speed mode, then refresh rate is reduced lowering power consumption, but the width of luminance decrease increases causing flicker
Solution Approach 1:
The patent implements preliminary anti-action by applying the reset voltage during the holding interval before the next data voltage is applied. This preemptive voltage replenishment counteracts the luminance decrease that would otherwise occur during the extended holding interval, preventing flicker before it becomes visible.
Solution Approach 2:
The reset voltage is applied in advance during the holding interval to prepare the data line voltage level for the next refresh cycle. This preliminary action ensures that when the next frame begins, the voltage has already been replenished, maintaining stable luminance throughout the extended frame period characteristic of low-speed mode.
3Illumination intensity
If reset voltage is applied frequently to maintain luminance, then flicker is reduced, but power consumption increases
Solution Approach 1:
The reset voltage is applied periodically rather than continuously, specifically during the holding interval when luminance would naturally decrease. This periodic application maintains luminance consistency only when necessary, avoiding unnecessary power consumption during intervals when the display is already displaying stable images.
Solution Approach 2:
The reset voltage is applied with excessive level (higher than the data voltage level) during the holding interval to ensure complete compensation for voltage decay. This partial action during a specific time window achieves the desired luminance consistency without requiring continuous voltage adjustment, thereby optimizing power consumption.
Data Source
AI summary
The present disclosure relates to data driving circuits, display panels and display devices. In accordance with embodiments of the present disclosure, by periodically supplying a reset voltage to the subpixel SP in a holding interval of a period in which the display device is driven in a low-speed drive mode, it is possible to enable a waveform of luminance in a refresh interval to be identical to a waveform of luminance in the holding interval, and to prevent occurrence of flickers in the low-speed drive mode. In addition, by setting an optimal reset voltage in accordance with a driving voltage supplied to the display panel and changing the reset voltage for matching a changed driving voltage, it is possible to prevent flickers from being visible and to reduce power consumption through low-speed driving.