Mobile terminal and corresponding display device with associated zooming features

A display device, comprising:

• an interface unit configured to be connected to a mobile terminal including a first display unit configured to display a first screen image within a first content boundary, wherein the first display unit is a touchscreen;
• and
• a controller configured to:
• interface with the external display device and display a monitor window including a second screen image corresponding to the first screen image on the second display unit of the external display device, wherein the second screen image is displayed within a second content boundary and the first and second screen images are identical;
• in response to receiving a first touch input on the touchscreen of the mobile terminal, simultaneously:
• displaying a smaller range of the first screen image within the first content boundary displayed on the touchscreen of the mobile terminal by zooming in the first screen image;
• enlarging the monitor window displayed on the second display unit;
• enlarging the second content boundary of the second screen image;
• enlarging the second screen image displayed within the second content boundary while maintaining the range of the second screen image displayed within the second content boundary;
• and
• displaying a third content boundary within the second content boundary, wherein the third content boundary corresponds to the first content boundary of the zoomed in first screen image displayed on the touchscreen of the mobile terminal.

A method of controlling a mobile terminal, the method comprising:

• displaying, via a first display unit on the mobile terminal, a first screen image within a first content boundary, wherein the first display unit is a touchscreen;
• connecting, via an interface unit on the mobile terminal, the mobile terminal to an external display device having a second display unit;
• interfacing, via a controller on the mobile terminal, the mobile terminal with the external display device to display a monitor window including a second screen image corresponding to the first screen image on the second display unit of the external display device, wherein the second screen image is displayed within a second content boundary and the first and second screen images are identical;
• and
• in response to receiving a first touch input on the touchscreen of the mobile terminal, simultaneously:
• displaying a smaller range of the first screen image within the first content boundary displayed on the touchscreen of the mobile terminal by zooming in the first screen image;
• enlarging the monitor window displayed on the second display unit;
• enlarging the second content boundary of the second screen image;
• enlarging the second screen image displayed within the second content boundary while maintaining the range of the second screen image displayed within the second content boundary;
• and
• displaying a third content boundary within the second content boundary, wherein the third content boundary corresponds to the first content boundary of the zoomed in first screen image displayed on the touchscreen of the mobile terminal.

A method of controlling a display device, the method comprising:

• interfacing, via an interface unit on the display device, with a mobile terminal including a first display unit configured to display a first screen image within a first content boundary, wherein the first display unit is a touchscreen;
• displaying, via a second display unit of the display device, a monitor window including a second screen image corresponding to the first screen image on the second display unit of the display device, wherein the second screen image is displayed within a second content boundary and the first and second screen images are identical;
• and
• in response to receiving a first touch input on the touchscreen of the mobile terminal, simultaneously:
• displaying a smaller range of the first screen image within the first content boundary displayed on the touchscreen of the mobile terminal by zooming in the first screen image;
• enlarging the monitor window displayed on the second display unit;
• enlarging the second content boundary of the second screen image;
• enlarging the second screen image displayed within the second content boundary while maintaining the range of the second screen image displayed within the second content boundary;
• and
• displaying a third content boundary within the second content boundary, wherein the third content boundary corresponds to the first content boundary of the zoomed in first screen image displayed on the touchscreen of the mobile terminal.