Virtual display device drivers compatible with windows display driver model
US9058759B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 2013 |
| Grant date | Jun 16, 2015 |
| Priority date | — |
| Expiry date | Jan 31, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/4411
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A virtual display system, compatible with Windows Display Driver Model (WDDM), facilitates extending a display virtually, to any display target, such as a window on the primary display, a tablet, or another personal computer altogether. The virtual WDDM display system device has a PCI filter driver, a virtual device user mode driver and a virtual device kernel mode driver. The virtual WDDM display system interacts with a physical WDDM display device, which it uses as a surrogate renderer. The PCI filter driver is used to force enumeration of a virtual display device. The virtual device kernel mode driver uses chained callbacks at increasing IRQ levels for simulating an interrupt from a real hardware device. Continuous segments in memory are used to simulate video memory on a physical display device. DirectX extensions are used to facilitate expectations at the hardware level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.