Display Driver Blank-Period Waveforms for Flicker-Free Variable Refresh
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Solution Overview
Problem
Display panels experience flicker due to differences in luminance when the driving frequency changes, which is not effectively addressed by existing technologies.
Innovation Solution
A display device and method that includes supplying data drop waveforms during the blank period of a frame period, where the waveforms rise in a step shape and then fall vertically, with varying maximum voltage values and intervals based on the blank period length and grayscale, to stabilize luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the driving frequency of the display panel is changed to enable variable frame modes, then the display device can synchronize with variable frame rates, but luminance differences occur between different driving frequencies causing flicker
Solution Approach 1:
The display driver applies a data drop waveform during the blank period of a frame to preemptively adjust the luminance of the display panel before the next display period begins. This preliminary action ensures that when the driving frequency changes, the luminance is already stabilized, preventing flicker during frequency transitions while maintaining variable frame rate synchronization capability
2Stability of the object's composition
If data signals are supplied during the blank period to stabilize luminance, then flicker is reduced, but the complexity of the display driver increases
Solution Approach 1:
The display driver applies the data drop waveform only during the blank period of the frame, rather than continuously adjusting data signals throughout the entire frame period. This localized approach stabilizes luminance changes without adding complexity to the main display period operation, maintaining simple data signal supply during the display period while adding minimal complexity only where needed during the blank period
Data Source
AI summary
A display device includes: a display panel including a plurality of pixels; and a display driver configured to display an image on the display panel in units of frame periods, to supply data signals corresponding to the image to the display panel during a display period of the frame period to display the image, and to not display the image during a blank period of the frame period, wherein during a blank period of one of the frame periods, the display driver is configured to supply data signals including at least one data drop waveform to the display panel.