Electrophoretic Display Flickering Reduction via Segmented Voltage
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Solution Overview
Problem
Existing electrophoretic display devices experience discomfort 'flickering' during screen renewal due to rapid changes in luminance and color density, and struggle to display multiple gray scales and intermediate colors effectively.
Innovation Solution
An image display device with a memory property, featuring a configuration with pixel electrodes, a facing electrode, and an electrophoretic layer containing multiple charged particles of different colors, where specific voltage driving waveforms are applied to transition the display state from a previous screen to a next screen through intermediate transitions, ensuring desired color density and reducing flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional electrophoretic display devices apply voltage to renew the screen, then the screen is updated from previous state to next state, but rapid changes in luminance and color density cause discomfort flickering
Solution Approach 1:
The screen renewal process is segmented into multiple intermediate transitions instead of a single direct transition. The voltage driving waveform is divided into multiple stages, each producing a partial transition state, thereby breaking down the rapid luminance change into smaller, less perceptible steps that reduce flickering while maintaining renewal efficiency
Solution Approach 2:
The patent employs periodic voltage driving waveforms with multiple cycles to achieve screen renewal. By applying voltage in periodic pulses with intermediate states, the system allows electrophoretic particles to move gradually through intermediate positions, creating smooth transitions that minimize flickering while maintaining the overall renewal speed
2Adaptability or versatility
If conventional electrophoretic display devices use simple voltage driving, then the device configuration remains simple, but the ability to display multiple gray scales and intermediate colors is limited
Solution Approach 1:
The patent utilizes parameter changes in the voltage driving waveform, specifically varying voltage magnitude and duration across multiple driving cycles, to control the position of electrophoretic particles. By changing voltage parameters systematically, the system achieves multiple gray scales and intermediate colors without adding complex hardware, maintaining device simplicity while enhancing color display capability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables smooth transitions and reduced flickering during screen renewal, allowing for the display of single colors, intermediate colors, and multiple gray scales with a simplified configuration, effectively addressing the limitations of existing technologies.
Implementation Method 1
an electrophoretic layer interposed between the first substrate and second substrate and containing electrophoretic particles in a manner to allow an electrophoresis in the electrophoretic layer
Data Source
AI summary
An image display device is provided which suppresses discomfort “flickering” in a process of renewing a screen to realize multiple gray level displaying including an intermediate color. Electrophoretic particles are made up of n-kinds of charged particles C1, . . . , Ck, . . . , Cn having colors different from one another and threshold voltages to initiate an electrophoresis. Each of charged particles C1, . . . , Ck, . . . , Cn satisfies a relationship characteristic of threshold value voltage of charged particles> . . . >threshold value voltage of charged particle Ck> . . . >threshold value voltage of charged particle Cn. A voltage applying unit, at time of renewing a screen, renews a screen to a next screen having a desired density by a transition of a relative color density of each charged particle to a relative color density of a corresponding intermediate state in order of charged particle C1> . . . >Ck, . . . , Cn for a voltage driving waveform of each charged particle.