Micro-Mirror Grayscale via Aperture Light Control
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Solution Overview
Problem
Micro-mirror display systems currently lack the ability to produce multiple brightness levels for grayscale images, limiting their image quality.
Innovation Solution
A micro-mirror device with a hinge-supported mirror plate that can be tilted to various positions using electrostatic forces, combined with an opaque aperture structure to control light transmission, allowing for multiple brightness levels by directing different portions of the reflected light beam to the display surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical stops are used to define mirror plate tilt positions, then the mirror plate can be held at specific angles, but the hinge experiences increased strain and the device lifetime is reduced
Solution Approach 1:
The patent replaces mechanical stops with an opaque aperture structure that optically defines the tilt positions. The aperture structure blocks light at specific angles, eliminating the need for mechanical contact stops. This substitution removes mechanical wear and strain from the hinge while maintaining precise tilt position definition, thereby increasing device lifetime and reliability.
2Manufacturing precision
If mechanical stops are used to control mirror plate tilt, then specific tilt angles are achieved, but the device complexity increases and manufacturing becomes more difficult
Solution Approach 1:
The patent eliminates mechanical stop structures and replaces them with an opaque aperture structure. This aperture structure is simpler to manufacture and integrate into the display device while achieving the same function of defining precise tilt angles through optical blocking rather than mechanical contact.
Solution Approach 2:
The opaque aperture structure acts as an intermediary between the mirror plate and the light path. It mediates the light transmission to define tilt positions without requiring direct mechanical interaction with the mirror plate, thereby simplifying the overall device structure while maintaining manufacturing precision.
3Adaptability or versatility
If larger mirror plate tilt angles are used to achieve multiple brightness levels, then more grayscale levels can be displayed, but the hinge experiences greater strain and operational frequency is limited
Solution Approach 1:
The patent changes the parameter of light transmission by using an opaque aperture structure that blocks light at specific angles. This allows multiple brightness levels to be achieved through different aperture blocking configurations rather than relying solely on large tilt angle changes. Smaller tilt angles can thus achieve the same grayscale display capability, increasing operational frequency while maintaining versatility.
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 the production of grayscale images with higher quality by eliminating the need for mechanical stops, reducing strain on the hinge, increasing device lifetime, and allowing for higher operational frequencies while using less power.
Implementation Method 1
the hinge can produce an elastic restoring force on the mirror plate when the mirror plate is tilted away from an un-tilted position
Implementation Method 2
a controller that can produce an electrostatic force to overcome the elastic restoring force to tilt the mirror plate from an un-tilted position to an 'off' position, a first 'on' position, or a second 'on' position
Implementation Method 3
a mirror plate tiltable around the hinge and having a reflective surface that can reflect incident light to form a reflected light beam
Implementation Method 4
an opaque aperture structure that can block substantially all of a reflected light beam from reaching the display surface when the mirror plate is tilted to the 'off' position
Data Source
AI summary
A micro mirror device is described. The device has a tiltable mirror plate with a reflective surface configured to reflect incident light to form a reflected light beam. A controller is configured to cause the mirror plate to tilt from an un-tilted position to an “off” position, a first “on” position, or a second “on” position. An opaque aperture structure is configured to block substantially all of a reflected light beam from reaching a display surface when the mirror plate is tilted to the “off” position, allow a first portion of a reflected light beam to pass through when the mirror plate is tilted to the first “on” position and allow a second portion of a reflected light beam to pass through when the mirror plate is tilted to the second “on” position. The tilting positions determine a brightness of display pixels.