Velocity compensated waveforms for non-flashy updates of electrophoretic displays
The described waveform method for electrophoretic displays addresses visual flicker and flashy transitions by synchronizing pixel transition velocities, ensuring smooth color changes suitable for rapid response applications.
WO2026147920A1PCT designated stage Publication Date: 2026-07-09E INK CORP
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- E INK CORP
- Filing Date
- 2025-12-30
- Publication Date
- 2026-07-09
AI Technical Summary
Technical Problem
Electrophoretic displays experience visual flicker and flashy transitions due to multiple positive and negative voltage pulses, which are not suitable for applications requiring instantaneous response and high contrast.
Method used
Implementing a black-to-white and white-to-black transition waveform with a combination of full-velocity and reduced-velocity voltage segments to match the transition velocities of adjacent pixels, reducing visible flicker and providing a smooth transition appearance.
Benefits of technology
The proposed waveform method minimizes visual flicker and achieves smooth color transitions, suitable for applications like page turning and stylus writing, by synchronizing the transition velocities of adjacent pixels.
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Smart Images
Figure US2025061544_09072026_PF_FP_ABST
Abstract
An electrophoretic display and a method for driving an electrophoretic display are disclosed for minimizing visible flicker during pixel transitions between black and white optical states. The method generates distinct transition waveforms for black-to-white and white-to-black transitions. Each waveform includes a plurality of full-velocity voltage segments followed by at least one reduced-velocity segment having a smaller voltage magnitude. For black-to-white transitions, the reduced-velocity segment occurs last; for white-to-black transitions, it occurs first. These tailored waveforms are applied to respective display pixels such that the transition velocity of a display pixel changing from black to white substantially matches that of a display pixel changing from white to black. This approach improves visual stability and reduces flicker artifacts during display updates.
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