Head-mounted display apparatus

1. A head-mounted display apparatus comprising:

a main frame having a surface adapted to face a user's face; and

a support part coupled to at least part of the main frame to fix the main frame to the user's face,

wherein the main frame comprises:

a front case adapted to receive an electronic device and a rear case adapted to enclose a lens fixing part, the lens fixing part adapted to integrally or detachably receive one or more lenses,

one or more lens moving rail fixing parts disposed within an interior of the rear case,

one or more lens moving rails corresponding to the one or more lens moving rail fixing parts, each lens moving rail having one end attached to the front case, and an other end adapted to be coupled to the corresponding lens moving rail fixing part,

one or more resilient members corresponding to the one or more lens moving rails, each lens moving rail disposed within an interior of the corresponding resilient member,

a position adjustment part that, when the position adjustment part is operated by the user, causes the front case to move along the one or more lens moving rails, so that a distance between the electronic device and the one or more lenses is changed,

a sensor module configured to measure a distance between the electronic device and the head-mounted display apparatus and detect an operation of the position adjustment part,

wherein a pattern is imprinted on a surface of the position adjustment part to allow for the sensor module to detect the operation of the position adjustment part.

2. The head-mounted display apparatus of claim 1 , wherein the surface of the main frame facing the user's face has a curved-surface structure of a facial shape such that the user is able to wear the head-mounted display apparatus.

3. The head-mounted display apparatus of claim 1 , wherein the main frame further comprises a cover coupled to the front case to support the electronic device.

4. The head-mounted display apparatus of claim 1 , wherein the resilient members are at least one of coil springs, plate springs, hydraulic springs, rubbers, and sponges.

5. The head-mounted display apparatus of claim 1 , wherein each lens moving rail fixing part includes a hook that supports the corresponding resilient member, and a recess adapted to receive the other end of the corresponding lens moving rails.

6. The head-mounted display apparatus of claim 5 , wherein threads are formed on the other end of each lens moving rail, the threads are adapted to fixedly couple to corresponding threads in the recess of the corresponding lens moving rail fixing part.

7. The head-mounted display apparatus of claim 1 , wherein the front case further comprises one or more coupling cylinders for coupling with the one or more lens moving rails, and wherein the one or more lens moving rails are disposed in an interior of the one or more coupling cylinders, and the one or more resilient members are disposed in an exterior of the one or more coupling cylinders.

8. The head-mounted display apparatus of claim 7 , wherein the front case further comprises bushes that are disposed in the interior of the one or more coupling cylinders.

9. The head-mounted display apparatus of claim 1 , wherein the main frame includes four lens moving rails and each lens moving rail is disposed at a different corner of the front case.

10. The head-mounted display apparatus of claim 1 , further comprising:

a touch panel on at least one side of the main frame, wherein the touch panel displays a graphical user interface (GUI) corresponding to a function of the electronic device and receives an input from the user,

wherein the main frame further comprises a nose recess on the surface facing the user's face, and wherein the support part is one of a goggle band, an eyeglass temple, a helmet, and a strap.

11. The head-mounted display apparatus of claim 1 , wherein the main frame further comprises:

a memory;

a communication module;

a user input module adapted to receive a user input; and

a controller configured to:

display a graphical user interface (GUI) corresponding to a function of the electronic device on the user input module, and

control the communication module to establish a communication connection with the electronic device and to transmit the user input to the electronic device.

12. The head-mounted display apparatus of claim 11 , wherein the controller is further configured to receive the detected operation of the position adjustment part from the sensor module and to display a user interface for identifying a tilt of the electronic device.

13. The head-mounted display apparatus of claim 12 , wherein the user interface for identifying the tilt provides a blurred or defocused image when the electronic device is tilted with respect to the head-mounted display apparatus and a focused or clear image when the electronic device is not tilted with respect to the head-mounted display apparatus.

14. The head-mounted display apparatus of claim 11 , wherein the controller is further configured to: display the measured distance; and

stop displaying the measured distance on the electronic device when the measured distance is in an error range.