Head wearable display with adjustable transparency
US9389423B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 2014 |
| Grant date | Jul 12, 2016 |
| Priority date | — |
| Expiry date | May 15, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0143
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An apparatus for providing adjustable transparency to an optical element of a head wearable display includes an electro-chromic film disposed across the optical element to adjust a transparency of the optical element to ambient light and a transparency controller coupled to control the electro-chromic film with a drive signal to decrease the transparency of the optical element as the brightness of the ambient light increases. The transparency controller includes a scaling circuit coupled to receive a power signal from a power source and coupled to output the driving signal to the electro-chromic film to control the transparency of the optical element. The scaling circuit scales the power signal to generate the driving signal. The transparency controller further includes a control circuit coupled to the scaling circuit to control the scaling applied by the scaling circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.