Abstract:
A keypad is configured for use with a portable unit having a display unit positioned in a first viewing orientation, such that the keypad&#39;s viewing orientation is rotably adjustable in cooperation with the orientation of the display, when the display unit is positioned in a second viewing orientation.

Description:
CROSS REFERENCE TO RELATED APPLICATION 
   Pursuant to 35 U.S.C. §119(a), this application claims the benefit of earlier filing date and right of priority to Korean Patent Application No. 2002-29986, filed on May 29, 2002, the contents of which is hereby incorporated by reference herein in its entirety. 
   BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a mobile handset and, more particularly, to a rotating-keypad for a mobile handset allowing a keypad to rotate relative to the body of the mobile handset. 
   2. Description of the Background Art 
   Mobile handsets continue to grow in popularity as they can be implemented to provide additional features and functionality. Mobile phones are being developed that provide various multimedia functions by executing numerous applications that provide services beyond the existing voice communication services. 
   The increase in the amount of information to be processed and viewed due to the addition of the multimedia functions into the mobile handset has required larger-scale display screens. In this respect, a liquid crystal display screen (LCD) of a folder-type mobile handset is being developed that has a vertically longer configuration. 
     FIG. 1  is an exemplary view showing a folder type mobile handset. 
   As shown in  FIG. 1 , in a state that the folder type mobile handset is unfolded, a display screen  30  is disposed on a cover  20 , and a main key pad  40  is disposed at a lower portion of a main body of the mobile handset and an auxiliary key pad  50  is disposed at the upper side of the main key pad  40 . As shown, the display screen&#39;s  30  height is larger than its width. 
   Though display screen  30  may be suited to display a portrait image or characters, it is not suitable for displaying a horizontally long landscape image or a video clip usually. 
   As a matter of course, the landscape image may be displayed in conformity to the width of the display screen. But in such a case, the image is reduced in size, failing to utilize the entire screen. And even if the landscape image is displayed on the entire screen, the original image would be positioned vertically, providing an unsuitable orientation for viewing purposes. 
   In such a case, the mobile handset itself need to rotated at an angle of 90° in order to view the image, which would cause the user to feel complexity for manipulating a 90°-rotated keypad arrangement. 
   SUMMARY OF THE INVENTION 
   In accordance with one aspect of the invention, a rotating-keypad for a mobile communication terminal having a user interface for manipulating display of a display screen, comprises: a keypad having a base for mounting the keypad into a recessed bay formed on a surface of a mobile communication terminal; wherein the base is rotatably mounted in the recessed bay. The rotating-keypad comprises: a disc-shaped keypad body; a rotation shaft approximately perpendicularly connected at an approximate center of bottom surface of the keypad body; and an anchor portion vertically extending from a bottom surface of the keypad body around the rotation shaft, the anchor portion having a smaller diameter than that of the keypad body. 
   The anchor portion comprises a stopper formed on a circumferential surface thereof and a first contact portion formed on a bottom surface thereof for electrical connection with the main body of the mobile communication terminal. In certain embodiments, the anchor portion is provided with first and second fixing holes formed on the circumferential surface thereof at respective approximate angles of 90° and 180° relative to the stopper. The recessed bay is provided with a shaft hole formed at an approximate center of bottom surface thereof for receiving the rotation shaft of the rotating-keypad and the recessed bay is preferably concaved in shape for receiving the anchor portion of the rotating-keypad around the shaft hole. 
   In the rotating-keypad, a second contact portion is formed on a bottom surface of the base so as to contact the first contact portion at an initial state and a third contact portion is formed at an approximate angle of 90° from the second contact portion. A guide groove is, preferably, formed along a circumferential wall of the base on the axis of the shaft hole between the second and third contact portions for receiving the stopper of the rotating-keypad. 
   In certain embodiments, the stopper slides along the guide groove so as to limit rotation of the rotating-keypad at an approximate angle of 90°. The recessed bay may be provided with a holder passage through which a keypad holder may be inserted so as to allow a user to rotatably manipulated the orientation of the keypad. The keypad holder may also include a knob that extends from outer circumference of the communication mobile terminal toward the base and is biased in one direction by an elastic member so that an end of the keypad holder is engaged with the concave portion. 
   In one or more embodiments, the keypad-mounting bay is provided with at least one opening formed on a circumferential wall thereof and the circumferential portion of the keypad body is partially exposed through said at least one opening. Said outer circumferential portion of the keypad body has ridges to facilitate manipulation of the keypad in clockwise or counter-clockwise directions. 
   Depending on implementation, the display screen can display information in a first orientation different from the initial display orientation. When the information is displayed in the first orientation, the rotating-keypad can be manually or automatically rotated to match the first orientation. 
   In accordance with another aspect of the invention, a keypad is configured for use with a portable unit having a display unit positioned in a first viewing orientation, such that the keypad&#39;s viewing orientation is rotatably adjustable in cooperation with the orientation of the display, when the display unit is positioned in a second viewing orientation. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. 
       FIG. 1  is a front view showing a mobile handset in accordance with conventional art; 
       FIG. 2  is a front view showing a rotating-keypad mobile handset in accordance with one embodiment of the present invention; 
       FIG. 3  is another view of the mobile handset of  FIG. 2  showing the rotating-keypad rotated at an angle of 90° in a clockwise direction relative to handset body; 
       FIG. 4  is a side view of the rotating-keypad mobile handset of  FIG. 2 ; 
       FIG. 5A  is a top planar view illustrating the rotating-keypad of the mobile handset of  FIG. 2 ; 
       FIG. 5B  is a side planar view of the rotating-keypad of  FIG. 5A ; 
       FIG. 6  illustrates a keypad-mounting bay of the mobile handset of  FIG. 2  in accordance with one or more embodiments; 
       FIG. 7  is a front view of a rotating-keypad mobile handset in accordance with another embodiment of the present invention; 
       FIG. 8  is a view showing a rotating-keypad of the mobile handset of  FIG. 7  rotated at an angle of 90° in a clockwise direction relative to a handset body; and 
       FIG. 9  is a side view of the rotating-keypad mobile handset of  FIG. 7 . 
   

   Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. 
   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   Referring to  FIG. 2 , in accordance with one aspect of the invention, a folder type rotating-keypad mobile handset comprises a main body  100  and a cover  200  one end of which is pivotally connected by a hinge mechanism  300 . 
   A microphone  130  is disposed at a lower portion of the main body  100  and a navigation keypad  120  for a function manipulation is disposed at a front upper portion. A disc type rotating-keypad  110  is rotatably mounted between the microphone  130  and the navigation keypad  120 , for example. 
   A speakerphone  230  is disposed at an inner upper portion of the cover  200 , and a longitudinally oriented display screen  210  is installed at a lower side of the speaker phone  230 . 
   In the portrait image mode, the rotating-keypad  110  is arranged in a first direction so that information displayed on the display screen  210  has an orientation that is compatible with the orientation of the rotating-keypad  110 . 
     FIG. 3  is a drawing illustrating the rotating-keypad mobile handset repositioned into a landscape image mode. 
   With reference to  FIG. 3 , the rotating-keypad  110  is rotated at an angle of approximately 90° in the clockwise direction from a portrait image mode to match the display orientation of an image displayed on the display screen  210  has been rotated at the angle of approximately 90° in the clockwise direction. 
   In such a case, the up, down, left, and right direction keys  121 ,  122 ,  123  and  124  of the navigation keypad  120  respectively become left, right, down, and up direction keys in relation to the new orientation of the image. 
     FIG. 4  is a side view of the folder type rotating-keypad mobile handset of  FIG. 3 . 
   As shown in  FIG. 4 , the main body  100  comprises a base for mounting the keypad into a mounting bay  150  that is recessed into the face of the mobile terminal correspondingly to the rotating-keypad  110 , so that the rotating-keypad  110  is rotatably mounted in the mounting bay  150 . 
   The mounting bay  150  is provided with a pair of openings  160  formed on two opposite sides of the wall formed around the mounting bay  150  such that the circumferential surface of the rotating-keypad  110  is partially exposed through the openings  160 . This allows a user to rotate the rotating-keypad  110  by manipulating the exposed portions of the rotating-keypad  110 . 
     FIG. 5A  and  FIG. 5B  are perspective planar and a side views illustrating the rotating-keypad  110  of the mobile handset of  FIG. 2 . 
   As shown in  FIG. 5A  and  FIG. 5B , in one embodiment, the rotating-keypad  110  comprises a disc-shaped keypad body, a rotation shaft  113  approximately perpendicularly connected at a center of the bottom surface of keypad body, and a preferably disc-shaped anchor  115  downwardly protruding from the bottom surface of keypad body around the rotation shaft  113 , the anchor  115  preferably having smaller diameter than that of the keypad body  110 . It should be noted that the keypad body and anchor  115  may be shaped in other geometric configurations. 
   In one embodiment, the keypad body  110  is provided with a circumferential ridged surface  111  so as to facilitate a better grip for a user to rotate the rotating-keypad  110  by applying pressure on the ridged surface exposed through the openings  160 . 
   The anchor  115  of the rotating-keypad includes a stopper  117  formed at one side of the circumferential surface of the anchor  115 , and a first contact portion  119  formed on the bottom surface for electrical connection with the main body  100  of the mobile handset. 
   In some embodiments, the anchor  115  is provided with first and second fixing holes  112   a  and  112   b  formed on the circumferential surface thereof at respective angles of approximately 90° and 180° relative to the position of the stopper  117  in a counterclockwise direction, for example. The rotating-keypad  110 , may rotate in either clockwise or counter-clockwise directions, depending on design and implementation. 
     FIG. 6  is a top planar view showing a keypad-mounting bay  150  of the rotating-keypad mobile handset of the present invention, in accordance with one embodiment. 
   As shown in  FIG. 6 , the mounting bay  150  is provided with a shaft hole  153  centrally formed for receiving the rotation shaft  113  of the rotating-keypad  110 . A preferably concaved portion  155  is formed on the surface of the mounting bay  150  for receiving the anchor  115  of the rotating-keypad around the shaft hole  153 . Alternatively, concaved portion  155  may be a cavity formed in any shape suitable for housing that anchor  115 . 
   The concave portion  155  is provided with a second contact portion  156   a  formed on the bottom surface thereof so as to contact the first contact portion  119  in the portrait image mode and a third contact portion  156   b  formed at an approximate angle of 90° in the clockwise direction, for example, from the second contact portion  156   a.  The third contact portion  156   b  contacts first contact portion  119  in the landscape image mode. 
   Also, the concave portion  155  is provided with a guide groove  158  formed along the circumferential wall thereof as much as 90° on the axis of the shaft hole  113  between the second and third contact portions  156   a  and  156   b  for receiving the stopper  117  of the rotating-keypad  110  such that the stopper  117  slides along the guide groove  158  to limit rotation of the rotating-keypad at the angle of 90°. 
   The keypad-mounting bay  150  is provided with a holder passage  157  communicating outside the main body  100  through which a keypad holder  159  is inserted so as to be manipulated outside. 
   The keypad holder  159  is downwardly biased by an elastic member (not shown) so that a head  159   a  of the keypad holder  159  is engaged with the first and second fixing holes  112   a  or  112   b  through the holder fixing hole  157   a.    
   When the rotating-keypad  110  is mounted in the keypad mounting bay  150 , the first contact portion  119  of the rotating-keypad  110  contacts the second contact portion of the keypad mounting bay  150  and the stopper  117  of the rotating-keypad  110  is positioned in the guide groove  158  of the keypad mounting bay  150 . 
   The head  159   a  of the holder  159  is inserted into the first fixing hole  112   a  of the anchor  115  mounted inside the concave portion  155  by the elastic member. 
   The operation of the rotating-keypad mobile handset constructed as above will now be explained. 
   With reference to  FIG. 2 , in a state that the rotating-keypad mobile handset of the present invention is set in a portrait image mode, the display screen  210  displays information in a vertical orientation in relation to the body of the mobile handset. 
   When a program requiring a landscape image mode is executed by a key manipulation on the rotating-keypad  110  in the portrait image mode, the display screen  210  displays information rotated at the approximate angle of 90° in a clockwise direction, for example. 
   Referring to  FIG. 6 , in such a case, a user pushes up a knob  159   b  of the holder  159 , for example, away from the main body, and rotates the rotating-keypad  110  in a clockwise direction, for example. 
   At this time, the rotation angle of the rotating-keypad  110  is limited at the angle of, for example, 90° by a guide groove  158 , so that the second fixing hole  112   b  is positioned facing the fixing hole  157   a.    
   In this state, the holder  159  is biased downwardly by the elastic force of the elastic member, and accordingly, the holder  159   a  is engaged with the second fixing hole  112   b  through the holder fixing hole  157   a,  so that the keypad is completely rotated to be easily manipulated in the landscape image mode. 
   In the landscape image mode, the first contact portion  119  of the rotating-keypad  110  is positioned rotated at the approximate angle of 90° with respect to the position of the portrait image mode and is in contact with a third contact portion  156   b  of the keypad mounting bay  150 . 
   Accordingly, the operation mode of the mobile handset is converted from the portrait image mode to the landscape image mode or vice versa, and the electric connection between the rotating-keypad and the main body is maintained in so that a signal provided by the keypad is transmitted to the main body. 
   In a case that the mobile handset is converted from the landscape image mode to the portrait image mode, the rotating-keypad  110  can be rotated at the approximate angle of 90° in the counterclockwise direction and fixed in the same manner as described above. 
   The rotating-keypad  110  can be implemented in such a manner that the rotating-keypad  110  automatically rotates in a required direction in a predetermined time if the display mode is converted from the portrait image mode to the landscape image mode and vice versa. 
   The display mode conversion of the display screen  210  can be performed according to the rotational movement of the rotating-keypad such that the display mode is converted by rotating the rotating-keypad  110 . 
   In some embodiments, the rotating-keypad  110  may also be used as a dial for adjusting brightness of the display screen  210 . 
     FIG. 7  is a front view of a rotating-keypad mobile handset in accordance with a second embodiment of the present invention.  FIG. 8  is a view showing that the rotating-keypad of the mobile handset of  FIG. 7  is rotated in the counterclockwise direction, and  FIG. 9  is a side view of the rotating-keypad mobile handset of  FIG. 7 . 
   As shown in  FIG. 7 , a flip type rotating-keypad mobile handset according to the second embodiment of the present invention is similar to the folder type mobile handset in structure and function of elements, except that a display screen  650 , a rotating-keypad  610 , and a navigation keypad  620  are arranged at a main body  600 , and a flip  700  is pivotally attached at a lower end portion of the main body  600 . 
   As described above, the rotating-keypad mobile handset of the present invention can be adaptively applied to utilize the entire screen by displaying information rotated at the approximate angle of 90° when a landscape image display is needed. 
   Also, in case that a landscape image is displayed on the screen rotated at the approximate angle of 90°, the rotating-keypad of the mobile handset may be rotated to have the same orientation, so that the user can manipulate the keypad while viewing the information of the landscape image without confusion. 
   Moreover, since the up, down, left, and right direction keys on the navigation keypad respectively function to move the image in accordance with the respective direction and orientation, the user can intuitively manipulate the direction keys. 
   As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalence of such meets and bounds are therefore intended to be embraced by the appended claims.