Optical Path Control Member with Pattern Electrodes
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Solution Overview
Problem
The existing switchable light blocking films face issues with precipitation of light conversion particles due to gravity, leading to reduced driving characteristics and increased light transmittance in the privacy mode.
Innovation Solution
An optical path control member is designed with a structure that includes a first substrate, a first electrode, a second substrate, a second electrode, and a light conversion part with pattern electrodes extending in a direction different from the longitudinal direction of the receiving part, allowing for the application of voltages with different polarities to prevent particle precipitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a switchable light blocking film is attached to a display screen, then the viewing angle can be controlled and privacy can be protected, but light conversion particles precipitate due to gravity causing reduced driving characteristics
Solution Approach 1:
The patent applies an electric field through pattern electrodes to counteract the gravitational force acting on light conversion particles. By generating an upward electric force that balances gravity, the particles are prevented from precipitating, thereby maintaining uniform distribution and consistent driving characteristics throughout the device's operation.
Solution Approach 2:
The pattern electrodes are designed to create an equipotential field distribution that counteracts gravitational effects. By establishing specific voltage patterns across the electrode structures, the system creates regions where the electric potential gradient generates forces that balance gravitational pull on the particles, preventing sedimentation.
2Reliability
If light conversion particles are used in the receiving part, then the light blocking function can be achieved, but light transmittance increases in the privacy mode due to particle precipitation
Solution Approach 1:
The electric field generated by the pattern electrodes creates an upward force on the light conversion particles that counteracts gravity. This prevents particle precipitation toward the bottom of the receiving part, ensuring that particles remain uniformly distributed and continue to effectively block light in the privacy mode without increasing unwanted light transmittance.
Solution Approach 2:
The system changes the physical state and position of light conversion particles by applying electrical parameters (voltage) through the pattern electrodes. By controlling the electric field strength and distribution, the particles can be maintained in a suspended state rather than precipitating, thus maintaining optimal optical properties for light blocking performance.
3Adaptability or versatility
If particles are allowed to move by voltage application, then switching between light transmitting and blocking modes is enabled, but gravity causes particle precipitation during operation
Solution Approach 1:
The pattern electrodes generate an electric field that creates an upward force on charged or polarizable particles to counteract gravitational pull. This allows particles to be moved vertically for mode switching while preventing unwanted precipitation, enabling reliable switching between light transmitting and blocking states without loss of particle position stability.
Solution Approach 2:
The system uses dynamic control of electric fields through pattern electrodes to manage particle behavior. By adjusting voltage patterns, particles can be dynamically positioned for mode switching while the electric field continuously counteracts gravity to prevent precipitation, providing both adaptability and stability.
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 optical path control member effectively controls the precipitation of light conversion particles, maintaining consistent driving characteristics and preventing unwanted increases in light transmittance in the privacy mode.
Implementation Method 1
voltages having different polarities are applied to the first pattern electrode and the second pattern electrode
Implementation Method 2
the pattern electrodes are disposed to be spaced apart from each other between a first end and a second end of the receiving part in the longitudinal direction
Implementation Method 3
The particles can move by application of voltage. The receiving part may be converted into a light transmitting part and a light blocking part by dispersion and aggregation of the particles
Data Source
AI summary
An optical path control member according to an embodiment includes a first substrate; a first electrode disposed on the first substrate; a second substrate disposed on the first substrate; a second electrode disposed under the second substrate; and a light conversion part disposed between the first electrode and the second electrode and including a receiving part in which a light conversion material is disposed, wherein at least one of the first electrode and the second electrode includes a plurality of pattern electrodes, wherein the pattern electrodes extend in a direction different from a longitudinal direction of the receiving part, wherein the pattern electrodes are disposed to be spaced apart from each other between a first end and a second end of the receiving part in the longitudinal direction, wherein the pattern electrode includes a first pattern electrode disposed adjacent to the first end and a second pattern electrode disposed farther from the first end than the first pattern electrode, and wherein voltages having different polarities are applied to the first pattern electrode and the second pattern electrode.