Device, method, and system of providing extended display with head mounted display

A computer-implemented method, comprising:

• generating, with a Head Mounted Display (HMD), at least one virtual display;
• presenting the at least one virtual display on the HMD, wherein the HMD is configured to enable a user to view the at least one virtual display and a physical display in a real-world scene, wherein the at least one virtual display is presented on the HMD as an additional object in the real-world scene, and wherein the at least one virtual display is used in conjunction with the physical display to present a first computer-generated information in a first extended desktop from a visual perspective of the user, the first extended desktop comprising a first portion assigned to the physical display and a second portion assigned to the at least one virtual display;
• determining if the physical display is in a field of vision of the HMD;
• and
• presenting the first computer-generated information in a second extended desktop comprising a third portion assigned to the at least one virtual display that represents the first portion, if the physical display is not in the field of vision of the HMD to continue viewing the first computer-generated information after the removal of physical display from the field of vision.

A multi-display system, comprising:

• a physical display, wherein the physical display is used to present computer-generated information to a user;
• a generation logic to generate a virtual display;
• and
• a Head Mounted Display (HMD), the HMD comprising:
• a see-through display;
• and
• a presentation unit to present the at least one virtual display on the see-through display,
• wherein the see-through display is configured to enable the user to view the at least one virtual display and the physical display in a real-world scene,
• wherein the at least one virtual display is presented on the see-through display as an additional object in the real-world scene, and
• wherein the at least one virtual display is used in conjunction with the physical display to present a first computer-generated information in a first extended desktop from a visual perspective of the user, the first extended desktop comprising a first portion assigned to the physical display and a second portion assigned to the at least one virtual display, wherein the presentation unit is configured to determine if the physical display is in a field of vision of the HMD;
• and wherein the presentation unit is configured to present the first computer-generated information that has been previously stored in the memory in a second extended desktop comprising a third portion assigned to the at least one virtual display that represents the first portion, if the physical display is not in the field of vision of the HMD to continue viewing the first computer-generated information after the removal of physical display from the field of vision.