Electrophoretic Light Beam Direction Control Device for Viewing Angle Switching
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Solution Overview
Problem
Existing light beam direction control devices with electrophoretic elements struggle to quickly switch between wide and narrow viewing angle states while maintaining low power consumption, as they require voltage application in both states and lack efficient transition methods.
Innovation Solution
A light beam direction control device comprising a pair of transparent substrates with conductive films and electrophoretic particles, where a control circuit adjusts the potential difference to change the light beam's direction, allowing for quick switching between viewing angles by short-circuiting or open-circuiting the electrodes, thereby optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If voltage is applied to maintain electrophoretic particles in a dispersed state for narrow viewing angle, then viewing angle control is achieved, but power consumption increases
Solution Approach 1:
The patent applies alternating voltage with a specific frequency range (50 Hz to 20 kHz) to the electrophoretic elements. This periodic action causes the charged particles to oscillate and disperse without requiring continuous high voltage, thereby achieving narrow viewing angle control with reduced power consumption compared to DC voltage application.
Solution Approach 2:
The patent changes the voltage parameter from DC to alternating voltage and optimizes the frequency parameter within 50 Hz to 20 kHz. This parameter change enables the electrophoretic particles to achieve a dispersed state for narrow viewing angle while consuming less power, as the alternating voltage creates an oscillating electric field that prevents particle settling without requiring sustained high energy input.
2Adaptability or versatility
If alternating voltage is applied to disperse electrophoretic particles for narrow viewing angle state, then viewing angle control is achieved, but transition time between states increases
Solution Approach 1:
The patent applies a high-voltage pulse before switching to the alternating voltage for narrow viewing angle state. This preliminary action quickly disperses the electrophoretic particles, significantly reducing the transition time. The high-voltage pulse prepares the particle distribution in advance, allowing faster state switching compared to applying alternating voltage alone.
3Adaptability or versatility
If DC voltage is applied to move electrophoretic particles for wide viewing angle state, then particle positioning is achieved, but power consumption increases
Solution Approach 1:
The patent uses alternating voltage instead of DC voltage to achieve the wide viewing angle state. The periodic oscillation of the electric field keeps particles in a controlled state without requiring continuous particle movement, thereby reducing power consumption while maintaining the wide viewing angle effect.
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
Enables rapid and efficient switching between wide and narrow viewing angle states with reduced power consumption by controlling the distribution of electrophoretic particles, ensuring smooth transitions and effective peeking protection.
Implementation Method 1
a plurality of light beam transmissive regions disposed on the first transparent substrate and the second transparent substrate; light beam absorbing regions each disposed between light beam transmissive regions adjacent to each other and including light beam blocking electrophoretic particles and transmissive dispersion medium, the electrophoretic particles having charges of a specific polarity
Implementation Method 2
a control circuit configured to control potential difference between the first transparent conductive film and the second transparent conductive film
Data Source
AI summary
A light beam direction control device is provided with a transparent substrates in which main surfaces of the transparent substrate are opposed to each other, transparent conductive films respectively disposed on the main surface side of the transparent substrate, electrodes electrically connected to the transparent conductive films, a control circuit for controlling a potential difference between the transparent conductive films and a plurality of light beam transmitting regions arranged on the transparent substrates, light beam absorbing regions disposed between the adjacent light beam transmitting regions, and the transparent conductive films. When shifting the range of outgoing direction of light beam to a narrow state, the control circuit applies the electrodes electrically open and holds the open state.