Pulse width modulation for a head-mounted display device display illumination system
US10074299B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 28, 2015 |
| Grant date | Sep 11, 2018 |
| Priority date | — |
| Expiry date | May 24, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In various embodiments, methods and systems for controlling display illumination is provided. A display illumination system supports maintaining color stability and reducing perceived flicker while changing the brightness of a display. The display illumination system supports light emitting diode (LED) sequencing using a pulse width modulation (PWM) control circuit for controlling the brightness and dimness of LEDs. In operation, the PWM control circuit drives the plurality of LEDs based on generating control signals for two or more subframes of an image frame. Specifically, within each subframe, at least two control signals are generated therien. In one embodiment, the display illumination system supports a display of an optical see-through head mounted display (HMD) device. In particular, the HMD device includes LEDs that allow a user to observe their physical surroundings, while LEDs and other optical elements add light into a visual path of a user to provide an augmented reality image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.