Hand-held device having three-dimensional viewing function with tilt sensor and display system using the same

An image display system comprising:

• a management server in which an image file database is established, wherein said image file database is comprised of a plurality of image files and image index data mapped to the plurality of image files and each of said plurality of image files contains an image of goods or thing seen in view of a given position on a sphere, the goods or thing being located at a center of the sphere;
• a hand-held device having an image viewing means for carrying out 3-dimensional viewing function in cooperation with said image file database and a display part for displaying an image of a given image file among said plurality of image files according to output of said image viewing means;
• and
• a communication network for communication between said management server and said hand-held device with said image viewing means, wherein said image viewing means includes a memory for storing said plurality of image files and image index data mapped to the plurality of image files, wherein said image files and image index data are downloaded from said management server;
• a tilt sensor for producing data representing a posture of said hand-held device;
• a tilt angle conversion module for receiving said posture data from said tilt sensor and thus producing a tilt value of said hand-held device;
• a viewing position decision module for receiving said tilt value from said tilt angle conversion module, setting a reference tilt value of said hand-held device, producing a relative tilt value of said hand-held device with respect to said reference tilt value thereof and producing said image index data transformed from said relative tilt value, and;
• a controller for sensing the operation of said viewing position decision module and accessing said first memory to extract an image index data identical with the image index data produced from said viewing position decision module and an image file mapped to said identical image index data.