Display methods and apparatus
The invention relates to methods and apparatus for forming images on a display utilizing a control matrix to control the movement of MEMs-based light modulators.
1. A display apparatus comprising:
a shutter assembly comprising a shutter and a drive electrode, configured such that in response to the generation of a potential difference between the shutter and the drive electrode, the shutter is electrostatically drawn towards the drive electrode; and
a control matrix including,
a first voltage interconnect for applying a first voltage to one of the shutter and the drive electrode, and
a second voltage interconnect for applying a second voltage to the other of the shutter and the drive electrode, thereby generating the potential difference between the shutter,
wherein the first voltage has a higher magnitude than the second voltage and the first voltage is applied to the one of the shutter and the drive electrode having a lower capacitance.
2. The display apparatus of claim 1 , wherein the second voltage is at or near ground.
3. The display apparatus of claim 1 , wherein the second voltage varies between ground and about one half the first voltage.
4. The display apparatus of claim 1 , wherein the second voltage interconnect is a global actuation interconnect.
5. The display apparatus of claim 1 , wherein the shutter assembly comprises a second drive electrode connected to a third voltage interconnect.
6. The display apparatus of claim 5 , wherein application of the first voltage to the drive electrode results in the opening of the shutter and application of a third voltage to the second drive electrode closes the shutter.
7. The display apparatus of claim 1 , wherein the application of the first voltage to the drive electrode opens the shutter.
8. The display apparatus of claim 1 , wherein the application of the first voltage to the drive electrode absent the application of the second voltage opens the shutter.
9. The display apparatus of claim 1 , wherein application of the second voltage to the shutter prevents movement of the shutter in response to the application of the first voltage.
10. The display apparatus of claim 1 , wherein the shutter assembly comprises a mechanical support for limiting the range of motion of the shutter substantially to a movement plane parallel to at which a light source is directed.
11. The display apparatus of claim 10 , wherein the shutter is electrostatically drawn substantially in the movement plane.
12. The display apparatus of claim 10 , wherein the shutter is electrostatically drawn substantially in the movement plane.
13. The display apparatus of claim 1 , wherein the application of the first voltage to the drive electrode opens the shutter.
14. The display apparatus of claim 1 , wherein the application of the first voltage to the drive electrode absent the application of the second voltage opens the shutter.
15. The display apparatus of claim 1 , wherein application of the second voltage to the shutter prevents movement of the shutter in response to the application of the first voltage.
16. The display apparatus of claim 1 , wherein the shutter assembly comprises a mechanical support for limiting the range of motion of the shutter substantially to a movement plane parallel to at which a light source is directed.
17. A method of forming an image, comprising:
providing a shutter assembly comprising a shutter and a drive electrode, configured such that in response to the generation of a potential difference between the shutter and the drive electrode, the shutter is electrostatically drawn towards the drive electrode; and
applying a first voltage to one of the shutter and the drive electrode;
applying a second voltage to the other of the shutter and the drive electrode, thereby generating the potential difference between the shutter,
wherein the first voltage has a higher magnitude than the second voltage and the first voltage is applied to the one of the shutter and the drive electrode having a lower capacitance.
18. The method of claim 17 , wherein the second voltage is at or near ground.
19. The method of claim 17 , comprising varying the second voltage between ground and about one half the first voltage.
20. The method of claim 19 , wherein the shutter assembly forms part of a pixel in an array of pixel, and varying the second voltage provides for global actuation of a plurality of pixels in the array of pixels.
21. The method of claim 17 , wherein the shutter assembly comprises a second drive electrode connected to a third voltage interconnect.
22. The method of claim 21 , applying the first voltage to the drive electrode opens the shutter and applying a third voltage to the second drive electrode closes the shutter.