Method for determining a refresh frequency for a matrix of OLED active pixels and corresponding device
US9865197B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 13, 2015 |
| Grant date | Jan 9, 2018 |
| Priority date | — |
| Expiry date | Nov 26, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2360/147
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A device includes an OLED pixel and a control circuit controlled at a refresh rate thereof. The device includes first and second dummy control circuits having similar operating characteristics to the control circuit. A controller and logic circuit switch on the first and second dummy control circuits and apply an input voltage so the first and second dummy control circuits output first and second output voltages. At a first time, the controller and logic circuit switch off the second dummy control circuit so a leakage current flows through the second dummy control circuit to ground, causing the second output voltage to reduce. Comparison circuitry determines a second time at which, due to the reduction of the second output voltage, a difference between the first and second output voltages is greater than a threshold. Determination circuitry determines the refresh frequency based upon elapsed time between the first and second times.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.