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A focus adjustable head mounted display system used in a head mounted display device for displaying digital contents comprising: a digital content storage unit for storing digital data including audio data and image data; an signal processing unit for receiving image signals from the digital content

A focus adjustable head mounted display system used in a head mounted display device for displaying digital contents comprising: a digital content storage unit for storing digital data including audio data and image data; an signal processing unit for receiving image signals from the digital content storage unit and processing the received image signals; a focus adjustment unit for adjusting an input image from the digital content storage unit according an input focus adjustment signal so that the adjusted display image responses the focus adjustment signal; an image display unit installed at a head mounted display device for displaying the adjusted display image; a focus input unit being a manually operation device for generating a focus adjustment signal to the signal processing unit; and the focus input unit providing a focus value to the focus adjustment software. A head mounted display device for realizing the focus adjustable head mounted display system is also disclosed.

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1. A focus adjustable head mounted display system used in a head mounted display device for displaying digital contents comprising:a digital content storage unit for storing digital data including audio data and image data;a signal processing unit connected to the digital content storage unit for re

1. A focus adjustable head mounted display system used in a head mounted display device for displaying digital contents comprising:a digital content storage unit for storing digital data including audio data and image data;a signal processing unit connected to the digital content storage unit for receiving image signals outputted from the digital content storage unit and processing the received image signals;a focus adjustment unit included in the signal processing unit for adjusting an input image from the digital content storage unit according an input focus adjustment signal to generate an adjusted display image so that the adjusted display image responses the focus adjustment signal;an image display unit connected to the signal processing unit; the image display unit being installed at a head mounted display device for displaying the adjusted display image which is directly viewed by at least one eye of a user wearing the head mounted display; anda focus input unit connected to the focus adjustment unit; focus input unit being a manually operation device for generating the focus adjustment signal to the signal processing unit; the focus input unit providing a focus value to the focus adjustment unit.2. The focus adjustable head mounted display system as claimed in claim 1, wherein the focus adjustment unit includes a focus adjustment software; the focus adjustment software operates the input image so as to get the adjusted display image mapping to the input image with a designated focus from the focus adjustment signal.3. The focus adjustable head mounted display system as claimed in claim 1, further comprising a sound playing unit for displaying sound from the signal processing unit.4. The focus adjustable head mounted display system as claimed in claim 3, wherein the sound playing unit is one of a microphone and at least one earphone.5. The focus adjustable head mounted display system as claimed in claim 1, wherein contents stored in the digital content storage unit include at least one of movies, songs, books, letters, short messages, web pages, notes, programs and recording data.6. The focus adjustable head mounted display system as claimed in claim 1, further comprising an image capturing device for capturing environmental images which are then processed through the signal processing unit and then displayed on display screens.7. The focus adjustable head mounted display system as claimed in claim 1, further comprising an input unit for inputted data into the focus adjustable head mounted display system by wired connections or wireless connections.8. The focus adjustable head mounted display system as claimed in claim 7, wherein the input unit is a wireless device for inputting air transmitted video and audio data so as to act as a television or an radio playing device.9. The focus adjustable head mounted display system as claimed in claim 7, wherein the input unit is one of a keyboard, a mouse, a compact disk drive, a floppy disk drive and a hard disk driver.10. The focus adjustable head mounted display system as claimed in claim 1, wherein the input unit is connected to the digital content storage unit for inputting data from the input unit to the signal processing unit for storage.11. The focus adjustable head mounted display system as claimed in claim 1, wherein the signal processing unit includes a data processing software.12. The focus adjustable head mounted display system as claimed in claim 1, wherein the signal processing unit include an image processing software.13. The focus adjustable head mounted display system as claimed in claim 1, wherein the signal processing unit includes a dynamic data processing software for calculating dynamic data of the objects in the input images, the dynamic data includes at least one of distances, speeds, accelerations.14. The focus adjustable head mounted display system as claimed in claim 1, wherein the signal processing unit includes an identification software for identifying desired objects in the inputted images.15. The focus adjustable head mounted display system as claimed in claim 1, wherein the signal processing unit includes control units having functions which are generally included in general video display device.16. The focus adjustable head mounted display system as claimed in claim 15, wherein the functions include at least one of fast display, slow display, returning of the display, searching, election of languages, and zoom selection.17. The focus adjustable head mounted display system as claimed in claim 1, further comprising an output device for outputting designated data from the signal processing unit by wired connection or wirelessly.18. A head mounted display device with a focus adjustable head mounted display system for displaying digital contents comprising:a casing for containing some elements of the head mounted display device;at least one temple piece;an digital content storage unit for storing digital data including audio data and image data;a signal processing unit connected to the digital content storage unit for receiving image signals from the digital content storage unit and processing the received image signals; signal processing unit comprising a focus adjustment unit; andan image display unit connected to the signal processing unit; the image display unit including at least one display screen corresponding to eyes of a user wearing the head mounted display device; anda focus input unit connected to the focus adjustment unit for generating a focus adjustment signal to the signal processing unit; andthe focus input unit providing a focus value to the focus adjustment software.19. The head mounted display device as claimed in claim 18, further comprising:a button for actuating the image focus adjustment signal which give different focus values according to an input from the button.20. The focus adjustable head mounted display device as claimed in claim 18, further comprising a sound playing unit for displaying sound from the signal processing unit.21. The focus adjustable head mounted display device as claimed in claim 18, further comprising an image capturing device for capturing environmental images which are then processed through the signal processing unit and then displayed on the displaying screens.22. The focus adjustable head mounted display device as claimed in claim 18, further comprising an input unit for inputted data into the focus adjustable head mounted display system by wired connections or wireless connections.23. The focus adjustable head mounted display device as claimed in claim 18, further comprising an output unit for outputting designated data from the signal processing unit by wired connection or wireless connection.24. The focus adjustable head mounted display device as claimed in claim 18, further comprising at least one buttons having functions selected from at least one of stopping display, adjusting sound quality, adjusting image quality, and turning on or off elements of the device.25. The focus adjustable head mounted display device as claimed in claim 18, wherein the at least one display screen is used both as a display and a lens.26. The head mounted display device as claimed in claim 18, wherein the image display unit is a projecting display unit, namely, the display image is generated and then is projected into the display screens so as to get a virtual image viewed by the user.27. The head mounted display device as claimed in claim 25, wherein the image display unit is a direct display unit; namely, the image is directly input to the lenses so as to present to the user.28. The head mounted display device as claimed in claim 18, further comprising a button for switching the focus adjustable head mounted display system; wherein as the button is turned on, the focus adjustable head mounted display system will be actuated and the display screen has the function of displaying image; and as the button is turned off, the focus adjustable head mounted display system is turned off so that the display screen is as a lens.29. The focus adjustable head mounted display device as claimed in claim 18, wherein a focus of each display screen is controlled individually.30. The focus adjustable head mounted display device as claimed in claim 18, wherein a button is used to generate the focus adjusting signal so as to generate a respective focus value.