Method and apparatus for driving a liquid lens
US7897899B2 · kind B2 · utility
4Cited by
1References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 18, 2008 |
| Grant date | Mar 1, 2011 |
| Priority date | — |
| Expiry date | Mar 26, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/08
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A liquid lens driver 10 has DC-DC converter 12, oscillator 14, pulse width modulator 16, and control logic circuit 18. The output buffer circuit 30 divides converter output voltage Vs of a prescribed amplitude (voltage level), input as the power source voltage, into bipolar, that is, positive/negative, output voltages Out-A, Out-B for output, and, corresponding to the H/L level of PWM signal CPWM, it turns ON/OFF the two output voltages Out-A, Out-B. In this way, from liquid lens driver 10, pulse width modulation (PWM) output voltages Out-A, Out-B are applied as driving voltage VL on electrodes 104, 108 of liquid lens 100.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.