Active discharge circuitry for display matrix
US11170698B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 27, 2018 |
| Grant date | Nov 9, 2021 |
| Priority date | — |
| Expiry date | Nov 27, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Active discharge circuitry for fast discharging of charge on an LED display matrix includes a mechanism to effectuate circuit path switching so as to electrically connect a charged node to a discharge circuit for controlled discharging of unwanted charge until it reaches a desired (e.g., programmable) value. The active discharge circuitry includes a control circuit generating appropriate timing and digital control signals for starting and stopping (e.g., actuating a switch) the discharge activities. The disclosed techniques accommodate variations in channel-to-channel start times for mitigating ghosting effects that would otherwise be presented from the LED display matrix due to residual (i.e., unwanted) charges remaining electrically loaded on display elements via, for example, charged parasitic capacitance or other such transients, after a current driver of a specific channel has stopped driving.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.