Roll-Up Actuator Light Screening for High-Speed Camera Modules
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Solution Overview
Problem
Existing light screening devices, particularly mechanical optical shutters, face challenges in achieving small size, low thickness, high response speed, complete light blocking, and uninterrupted light transmission, especially in high-definition camera modules with increasing pixel density, where moving object distortion and quick shuttering speed are critical.
Innovation Solution
A light screening apparatus comprising a substrate with a light-transmitting region, a transparent electrode, and roll-up actuators that are opaque and fixed on the circumference or edge of the substrate, with light screening patterns formed between the actuators, allowing for complete light blocking when driven and uninterrupted light transmission when rolled up, utilizing differences in residual stress and electrostatic or piezo-electric driving forces for rapid operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If mechanical optical shutter is made small-sized and thin, then device size is reduced, but light blocking completeness and response speed are compromised
Solution Approach 1:
The shutter is divided into multiple independent roll-up actuators arranged in parallel, each capable of independently covering its respective region. This segmentation allows the shutter to maintain small size while achieving complete light blocking through coordinated operation of multiple actuators with light screening patterns in the gaps.
Solution Approach 2:
The actuators are arranged radially from the center to the circumference of the light-transmitting region, utilizing radial dimensionality. This arrangement allows compact packaging of multiple actuators within a small circular aperture while maintaining sufficient light blocking coverage through the radial extension of each actuator.
2Speed
If mechanical optical shutter response speed is increased, then shuttering speed is improved, but structural complexity and manufacturing difficulty increase
Solution Approach 1:
The actuators utilize residual stress differences in their thin-film structures (such as between ITO and ITO layers) to achieve automatic rolling up and down without complex driving mechanisms. This parameter-based approach enables high response speed while keeping the structural complexity low.
Solution Approach 2:
The roll-up actuators are designed to automatically perform their shielding function through inherent residual stress differences, eliminating the need for complex external driving mechanisms. The structure itself provides the driving force through material stress characteristics.
3Reliability
If roll-up actuators are arranged closely to reduce gaps, then light blocking is improved, but manufacturing precision requirements increase
Solution Approach 1:
Light screening patterns are selectively formed only in the gap regions between actuators rather than requiring perfect sealing throughout. This local approach addresses light blocking needs precisely where gaps exist, reducing the overall manufacturing precision requirements while maintaining effective light blocking.
Solution Approach 2:
Light screening patterns serve as intermediary elements that fill the gaps between roll-up actuators. These patterns mediate the light blocking function in the gap regions, allowing the actuators to be arranged closely without requiring extremely high positioning precision.
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 a compact, high-speed light screening device that completely blocks light when closed and allows sufficient light transmission when open, addressing the need for quick response times and minimizing image distortion in high-definition camera modules.
Implementation Method 1
utilizing differences in residual stress and electrostatic or piezo-electric driving forces for rapid operation
Implementation Method 2
utilizing differences in residual stress and electrostatic or piezo-electric driving forces for rapid operation
Implementation Method 3
utilizing differences in residual stress and electrostatic or piezo-electric driving forces for rapid operation
Data Source
AI summary
There are provided a light screening apparatus and a manufacturing method thereof. The light screening apparatus includes a substrate, a transparent electrode, a plurality of roll-up actuators and a plurality of light screening patterns. The substrate includes a light-transmitting region and the transparent electrode is formed on one surface of the substrate. Each roll-up actuator, which has opaque characteristics, is fixed on the circumference portion of the light-transmitting region and includes a fixing end and a moving part which extends from the fixing end. Gaps are formed between adjacent roll-up actuators, and the light screening patterns are formed on the substrate at locations corresponding to the gaps. The light-screening patterns prevent light incident through the gaps from being transmitted to the light-transmitting region.