MEMS shutter assemblies for high-resolution displays
This disclosure provides systems, methods and apparatus for providing compact shutter assemblies. Shutter assemblies can be formed in a more compact fashion, allowing for higher pixel-per-inch displays, by incorporating shutters that during actuation pass over or under portions of the actuators that control those shutters.
1. An apparatus, comprising:
a substrate; and
an electromechanical systems (EMS) display element supported over the substrate, the EMS display element including:
an electrostatic actuator including:
a first beam electrode coupled to a first anchor;
a second beam electrode coupled to a second anchor,
wherein, the first and second anchors support the first and second beam electrodes over the substrate such that at least one of the first and second beam electrodes deforms towards the other in response to the application of a voltage across the first and second beam electrodes; and
a shutter, including a conductive sidewall, and having a proximal level substantially parallel to the substrate and a distal level substantially parallel to the substrate, the distal level spaced from the substrate by a greater distance than the proximal level is spaced from the substrate, wherein the conductive sidewall comprises a majority of the second beam electrode and connects the proximal and distal levels, and wherein each of the proximal and distal levels couples to, and extends away from, the conductive sidewall, and wherein the shutter includes a perimeter edge and the conductive sidewall of the shutter is positioned within a projection of the perimeter edge of the shutter onto the substrate such that upon actuation of the electrostatic actuator, the perimeter edge of the shutter passes over or under at least a portion of the first beam electrode.
2. The apparatus of claim 1 , wherein a shortest distance between the first anchor and an edge of the proximal level closest to the first anchor is less than a shortest distance between the first anchor and an edge of the distal level closest to the first anchor, and wherein the second beam electrode connects to the shutter at the distal level.
3. The apparatus of claim 1 , wherein a shortest distance between the first anchor and an edge of the proximal level closest to the first anchor is less than a shortest distance between the first anchor and an edge of the distal level closest to the first anchor, and wherein the second beam electrode connects to the shutter at the proximal level.
4. The apparatus of claim 1 , further comprising a second shutter coupled to a second electrostatic actuator, and configured to actuate in a direction opposite to that of the shutter, and wherein together, the shutter and the second shutter, are configured to selectively obstruct a common light transmissive region defined in a light blocking layer on the substrate.
5. The apparatus of claim 1 , comprising:
a display including the EMS display element;
a processor that is configured to communicate with the display, the processor being configured to process image data; and
a memory device that is configured to communicate with the processor.
6. The apparatus of claim 4 , wherein each of the shutter and the second shutter include distal and proximal levels which are substantially parallel to the substrate, and wherein the shutter and the second shutter are configured such that when the shutter and the second shutter are in a light obstructing state, the distal levels of the shutter and the second shutter are closest to one another at a location that is laterally offset from a location where the proximal levels of the shutter and the second shutter are closest to each other.
7. The apparatus of claim 4 , wherein portions of the shutter and the second shutter are configured to serve as opposing electrodes of a third electrostatic actuator such that when a potential difference is applied across the shutter and the second shutter, the shutter and the second shutter are drawn together into a light obstructing state.
8. The apparatus of claim 4 , further comprising a central electrostatic actuator positioned between the shutter and the second shutter and configured to exert a common electrostatic force on the shutter and the second shutter.
9. The apparatus of claim 5 , further comprising:
a driver circuit configured to send at least one signal to the display; and wherein
the processor is further configured to send at least a portion of the image data to the driver circuit.
10. The apparatus of claim 5 , further comprising:
an image source module configured to send the image data to the processor, wherein the image source module comprises at least one of a receiver, transceiver, and transmitter.
11. The apparatus of claim 5 , further comprising:
an input device configured to receive input data and to communicate the input data to the processor.