Electrophoretic Display and Driving Method Thereof
The five-color particle system with hierarchical mobility and PWM driving addresses manufacturing complexity and brightness issues in electrophoretic displays, achieving high contrast, purity, and reduced power consumption.
KR102991492B1Active Publication Date: 2026-07-15NSPECTRA CO LTD
Patent Information
- Authority / Receiving Office
- KR · KR
- Patent Type
- Patents
- Current Assignee / Owner
- NSPECTRA CO LTD
- Filing Date
- 2025-10-29
- Publication Date
- 2026-07-15
AI Technical Summary
Technical Problem
Conventional electrophoretic display technologies face issues such as complex manufacturing processes, low contrast ratio, reduced brightness and resolution, and slow driving methods due to the use of multiple particle types and complex driving circuits.
Method used
A five-color particle system with independent black particles, hierarchical mobility, and a PWM driving method using particles of the same polarity to enhance contrast and simplify the driving circuit.
Benefits of technology
The solution achieves a contrast ratio of 10:1 or higher, color purity of 0.1 or less, and reduces power consumption by 40% while ensuring high reliability and durability against electrostatic aggregation.
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Smart Images
Figure 112025120599434-PAT00001 
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Abstract
The present invention provides an electrophoretic fluid comprising a fluid and five types of particles dispersed in the fluid, a display device comprising the same, and a driving method thereof. The electrophoretic fluid comprises (a) white light-scattering particles and black light-absorbing particles having a common charge of a first polarity, and (b) three types of colored particles having a common charge of a second polarity opposite to the first polarity and having subtractive primary colors of cyan, magenta, and yellow, respectively. Essentially, (c) all of the particles are substantially opaque (opacity index ≥ 0.95), and (d) the three types of colored particles have distinct hierarchical electrophoretic mobilities (mobility ratio ≥ 1.5). The display device of the present invention comprises the medium and has a contrast ratio of 10:1 or greater in the black state. The driving method of the present invention implements color by selectively driving the particles with different mobilities by adjusting a voltage pulse width of substantially constant amplitude. This enables the realization of a full-color electrophoretic display that is easy to manufacture, offers excellent contrast ratio through the realization of 'real black', and is simple to operate with high reliability.
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