Electromechanical Shutter Light Modulator for MEMS Displays
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Solution Overview
Problem
Current liquid crystal displays (LCDs) face challenges in competing with electromechanical light modulators in terms of picture performance, light efficiency, and cost, as they struggle to achieve comparable results.
Innovation Solution
The development of electromechanical light modulators that utilize one or two electrostatic actuators with a light shutter supported by a substrate, featuring light transmitting and blocking regions, and a manufacturing method that includes cantilever beams and embedded light reflectors to enhance light recycling and absorption, allowing for efficient light modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If LCDs are used to achieve flat panel display, then display area is increased, but light efficiency and picture performance deteriorate compared to electromechanical light modulators
Solution Approach 1:
The patent replaces the liquid crystal optical modulation system with an electromechanical shutter system. The shutter physically blocks or transmits light through lateral movement, substituting the complex liquid crystal alignment and switching mechanism with a simpler mechanical occlusion approach, thereby achieving higher light efficiency while maintaining flat panel display area
Solution Approach 2:
The patent implements a light recycling mechanism where light blocked by the shutter in the OFF state is reflected back toward the light source or viewing direction, recovering otherwise wasted light. This increases overall light efficiency by ensuring that blocked light contributes to the display output rather than being completely lost
2Illumination intensity
If shutter is positioned close to substrate surface to reduce gaps, then light transmission efficiency is improved, but shutter movement freedom deteriorates due to physical contact constraints
Solution Approach 1:
The patent introduces an electrostatic field as an intermediary between the shutter and substrate. The electrostatic actuator generates attractive force across a small gap without physical contact, enabling the shutter to be positioned very close to the substrate for high light efficiency while maintaining movement freedom through field-based actuation rather than mechanical contact
Solution Approach 2:
The patent replaces traditional mechanical contact-based actuation with electrostatic field-based actuation. This substitution allows the shutter to move laterally with minimal friction and no physical contact constraints, enabling close positioning to the substrate while preserving full movement freedom for efficient light modulation
3Power
If electrostatic actuator uses two electrodes close to each other, then actuation efficiency is improved, but device complexity increases due to additional electrode structures
Solution Approach 1:
The patent makes the shutter serve multiple functions: it acts as both the moving occlusion element for light modulation and as one of the two electrodes of the electrostatic actuator. This eliminates the need for separate electrode structures, reducing device complexity while maintaining high actuation efficiency through the close-proximity electrode configuration
Solution Approach 2:
The patent merges the shutter structure with the electrode structure by making the shutter conductive and using it as one electrode of the electrostatic actuator. This consolidation reduces the total number of components and simplifies the overall device architecture while preserving the high efficiency benefits of close electrode spacing
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
These modulators achieve improved light efficiency and picture performance by allowing the shutter to move laterally between positions without physical contact, increasing light transmission while reducing gaps between display elements, thus enhancing overall display performance and cost-effectiveness.
Implementation Method 1
an electrostatic actuator that applies an electrostatic force to move the shutter laterally between a first and a second position
Implementation Method 2
a light reflecting surface facing the backlight for recycling the light emitted from the backlight
Implementation Method 3
light from the backlight impinging said light transmitting regions of the shutter transmit through the light transmitting regions of the light absorbing layer when the shutter is at a first position and are absorbed in the light absorbing layer when the shutter is at a second position
Data Source
AI summary
Electromechanical light modulators and backlight providing efficient, low cost and high performance displays.