Electrophoretic Privacy Device with Adjustable Light Transmittance
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Solution Overview
Problem
Current privacy solutions for electronic displays, such as privacy screens on computer monitors, are not adjustable or tunable, making them ineffective in various applications where privacy control is necessary.
Innovation Solution
An electrophoretic privacy device is introduced, comprising an electrophoretic cell with semi-transparent positively-charged and negatively-charged particles dispersed in a dielectric fluid, which can be controlled by an electric field to adjust light transmittance, allowing for customizable privacy settings by accumulating particles towards electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed privacy screens are used on computer monitors, then privacy protection is provided, but adjustability and tunability are lost
Solution Approach 1:
The patent applies electrophoretic particles that can dynamically change their distribution state in response to electrical signals. The particles transition between accumulated states (blocking light) and dispersed states (allowing light transmission), enabling the privacy screen to adapt its transparency level dynamically rather than being fixed. This resolves the contradiction by making the privacy protection adjustable while maintaining reliability.
Solution Approach 2:
The patent changes the optical parameter (light transmittance) of the privacy screen by controlling the electrical charge state of electrophoretic particles. By applying different voltages, the particles accumulate or disperse, continuously varying the screen's transparency from opaque to transparent. This parameter change mechanism enables both reliable privacy protection and adjustable adaptability.
2Adaptability or versatility
If electrophoretic particles are used to control light transmittance, then adjustability is achieved, but energy consumption increases
Solution Approach 1:
The electrophoretic privacy device uses periodic or pulsed electrical signals to move particles into desired positions. Once particles are accumulated in a stable state, no continuous energy is required to maintain that state. The energy is consumed only during transitions when particles need to be moved, enabling adjustable privacy control with minimal ongoing energy consumption.
Solution Approach 2:
The electrophoretic particles possess inherent charge that allows them to maintain their accumulated position without continuous external energy input. The electrical field temporarily energizes the particles to move, but once positioned, electrostatic forces maintain the state passively. This self-service characteristic reduces energy consumption while preserving adjustability.
3Ease of operation
If particles are accumulated towards electrodes to control privacy, then light transmittance is controlled, but device complexity increases
Solution Approach 1:
The electrophoretic display layer serves multiple functions simultaneously: it acts as both the display medium and the privacy control mechanism. The same particles that form display content also provide privacy protection when accumulated. This multi-functionality reduces overall device complexity by eliminating the need for separate privacy screen components.
Solution Approach 2:
The patent merges the privacy control function with the existing electrophoretic display structure. The electrophoretic particles and electrodes that already exist for display purposes are also used for privacy control. By combining these functions into a single integrated system, device complexity is minimized while maintaining ease of operation for both display and privacy control.
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 electrophoretic privacy device effectively controls light transmittance, enabling adjustable privacy settings that can maintain display information visibility or obscurity based on particle distribution, even when power is turned off, thus providing efficient and energy-saving privacy management.
Implementation Method 1
Electrophoretic displays are non-emissive devices based on the electrophoresis of charged particles suspended in a fluid. When a voltage difference is imposed between the electrodes, the pigment particles may accumulate toward one of the electrodes
Implementation Method 2
the particles or the fluid may be seen through the transparent electrode according to the polarity of the voltage difference
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
An electrophoretic privacy device may include an electrophoretic cell coupled between a first electrode and a second electrode. The electrophoretic cell may comprise a plurality of semi-transparent positively-charged particles and a plurality of semi-transparent negatively-charged particles. The particles may be dispersed in a dielectric fluid in the electrophoretic cell. At least one of the first electrode and the second electrode may be transparent.