Controlling transitions in optically switchable devices
First Claim
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1. A method of causing a change in optical state in a switchable optical device, the method comprising:
- (a) controlling the current to the switchable optical device during an initial portion of a transition from a first optical state to a second optical state, wherein controlling the current during the initial portion maintains the magnitude of the current substantially between an upper defined safe current level and a lower defined fast switch current level; and
(b) controlling the voltage applied to the switchable optical device during a later portion of the transition from the first optical state to the second optical state such that the magnitude of the voltage is held substantially at a preset level.
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Abstract
A controller or control method may be designed or configured to operate without information about the current temperature of the device and/or the device'"'"'s environment. Further, in some cases, the controller or control method is designed or configured to control transition of an optical device to an intermediated state between two end states. For example, the controller may be configured to control a transition to a state of transmissivity that is intermediate between two end states of transmissivity. In such case, the device has three or more stable states of transmissivity.
201 Citations
21 Claims
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1. A method of causing a change in optical state in a switchable optical device, the method comprising:
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(a) controlling the current to the switchable optical device during an initial portion of a transition from a first optical state to a second optical state, wherein controlling the current during the initial portion maintains the magnitude of the current substantially between an upper defined safe current level and a lower defined fast switch current level; and (b) controlling the voltage applied to the switchable optical device during a later portion of the transition from the first optical state to the second optical state such that the magnitude of the voltage is held substantially at a preset level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A controller for controlling a change in optical state in a switchable optical device, the controller comprising:
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(a) one or more interfaces for providing control instructions, a driving voltage, and/or a driving current to the switchable optical device; and (b) instructions for controlling the change in optical state, wherein the instructions comprise; (i) controlling the current to the switchable optical device during an initial portion of a transition from a first optical state to a second optical state, wherein controlling the current during the initial portion maintains the magnitude of the current substantially between an upper defined safe current level and a lower defined fast switch current level; and (ii) controlling the voltage applied to the switchable optical device during a later portion of the transition from the first optical state to the second optical state such that the magnitude of the voltage is held substantially at a preset level. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification