Photonic MEMS and structures
View Patent ↗An interference modulator (Imod) incorporates anti-reflection coatings and/or micro-fabricated supplemental lighting sources. An efficient drive scheme is provided for matrix addressed arrays of IMods or other micromechanical devices. An improved color scheme provides greater flexibility. Electronic hardware can be field reconfigured to accommodate different display formats and/or application functions. An IMod's electromechanical behavior can be decoupled from its optical behavior. An improved actuation means is provided, some one of which may be hidden from view. An IMod or IMod array is fabricated and used in conjunction with a MEMS switch or switch array. An IMod can be used for optical switching and modulation. Some IMods incorporate 2-D and 3-D photonic structures. A variety of applications for the modulation of light are discussed. A MEMS manufacturing and packaging approach is provided based on a continuous web fed process. IMods can be used as test structures for the evaluation of residual stress in deposited materials.
1. A line-at-a-time electronic driving method comprising
applying a bias voltage to rows or columns of a device,
applying data voltages to the columns, in the case when the bias voltage is applied to the rows, or the rows, in the case when the bias voltage is applied to the columns, the data voltages being applied alternately about a value of the bias voltage,
actuation of the device occurring when a difference between the values of the data voltage and a select voltage is above a first predetermined level,
release of the device occurring when the difference between the values of the data voltage and the select voltage is below a second predetermined level lowest, and
the device maintaining its state when the select voltage is at the bias level.
2. The method of claim 1 in which the device comprises multiple MEMS devices.
3. The method of claim 1 in which the bias voltage is within a hysteresis window of the device.
4. The method of claim 3 in which the bias voltage is in the middle of the hysteresis window.
5. The method of claim 1 in which the data voltages include two possible values and the select voltages include two possible values that are applied to the rows or columns of the device such that the difference between one of the select voltages and one of the data voltages is above the first predetermined level, the difference between the other of the select voltages and the one of the data voltages is below the second predetermined level, and the difference between the other of the select voltages and the other of the data voltages is below the second predetermined level.
6. The method of claim 5 in which the difference between the other of the select voltages and one of the data voltages is above the first predetermined threshold.
7. The method of claim 1 in which the select voltages are applied in alternating frames such that voltages of alternate polarity are applied to a selected row in successive frames.
8. The method of claim 1 in which the select voltages are applied in frames, the select voltages being applied to successive rows in separate portions of each frame.
9. The method of claim 1 in which the select voltages are applied in repetitive passes to at least portions of each one of successive frames.
10. The method of claim 1 in which the select voltages are applied to different portions of a frame at different rates.
11. The method of claim 1 in which the first predetermined threshold is about 9 volts adn the second predetermined threshold is about 0 volts.