Apparatus and method for displaying document

Abstract

Provided are an apparatus and method for displaying a document, the document display apparatus including an image processor which displays a document including a plurality of pages; a memory unit which stores individual unit elements constituting the document and image data including the individual unit elements; and a controller which controls the image processor to generate the image data corresponding to at least one page estimated to be turned to among the plurality of pages, store the image data in the memory unit, and display the image data corresponding to a requested page among the stored image data when a user requests a page transition. With this, the page transition speed may be improved through image caching.

What is claimed is: 
     
         1 . A document display apparatus comprising:
 an image processor which displays a document comprising a plurality of pages;   a memory unit which stores unit elements of the document and a plurality of image data comprising the unit elements; and   a controller which controls the image processor to generate a first image data corresponding to at least one page estimated to be selected from among the plurality of pages of the document, store the generated first image data in the memory unit, and when a page transition is requested by user and selects the estimated page of the document, controls the image processor to display the selected page of the document using the first image data stored in the memory unit,   wherein the controller controls the image processor to sequentially generate the first image data in order of neighboring a currently displayed page,   wherein the first image data is alternately generated in directions of a subsequent page and a previous page with respect to the currently displayed page; and   wherein the controller controls the image processor to prioritize the unit elements based on a user's selection.   
     
     
         2 . The document display apparatus according to  claim 1 ,
 wherein the controller controls the image processor to generate and display a second image data corresponding to the requested page if a first image data corresponding to the requested page is not stored in the memory unit.   
     
     
         3 . The document display apparatus of  claim 2 ,
 wherein the memory unit additionally stores a memory map, the memory map comprising a plurality of addresses corresponding to the plurality of second image data.   
     
     
         4 . The document display apparatus of  claim 3 ,
 wherein a number of the plurality of second image data corresponds to neighboring pages of the current page, in accordance with an estimated page turn of the current page and the number of the plurality of addresses of stored image data.   
     
     
         5 . The document display apparatus of  claim 4 ,
 wherein the controller controls the image processor to sequentially generate a predetermined number of second image data corresponding to neighboring pages of the current page, in accordance with said estimated page turn and a predetermined number of the plurality of addresses of second image data, said sequence based on a page distance from the current page.   
     
     
         6 . The document display apparatus of  claim 4 ,
 wherein the controller controls the image processor to sequentially generate second image data corresponding to additional subsequent pages, in accordance with said estimated page turn and a remaining number of the plurality of addresses of second image data, said sequence based on a page distance from the current page.   
     
     
         7 . The document display apparatus of  claim 4 ,
 wherein if the requested page turn does not correspond to the estimated page turn of the current page, the controller controls the image processor to compare the plurality of second image data to an updated estimated page turn.   
     
     
         8 . The document display apparatus of  claim 7 ,
 wherein the image processor, based on the comparison, generates updated image data in accordance with the updated estimated page turn, and selectively deletes second image data that is not in accordance with the updated estimated page turn.   
     
     
         9 . The document display apparatus of  claim 7 ,
 wherein, based on the comparison, the image processor updates the addresses of said memory map to correspond to the updated image data and the updated estimated page turn.   
     
     
         10 . The document display apparatus of  claim 1 , further comprising:
 a transition speed setting unit,   wherein each of the plurality of pages of the document comprises a plurality of image elements, and   wherein, in accordance with a transition speed, the controller controls the image processor to generate the plurality of second image data by selectively abstracting or excluding at least one image element.   
     
     
         11 . The document display apparatus of  claim 10 ,
 wherein the selective abstracting or excluding of at least one image element is in accordance with a priority based on the effect of said image element on delivering meaning of the corresponding page of said image element.   
     
     
         12 . The document display apparatus of  claim 4 ,
 wherein the controller controls the image processor to sequentially generate said second image data, in accordance with said estimated page turn and a number of the plurality of addresses of second image data,   wherein said sequence is based on a page distance from the current page.   
     
     
         13 . The document display apparatus according to  claim 1 ,
 wherein the controller controls the image processor to generate at least one of the first image data by stepwise excluding unit elements with a low priority, based on a page transition speed increase.   
     
     
         14 . The document display apparatus according to  claim 1 ,
 wherein the first image data is alternately generated in directions of a subsequent page and a previous page with respect to the currently displayed page, within a predetermined range, and the first image data is sequentially generated in the direction of the subsequent page, with respect to the current displayed page, beyond the predetermined range.   
     
     
         15 . The document display apparatus according to  claim 1 ,
 wherein the controller generates the first image data and a memory map for mapping a location where the first image data is stored, and stores the first image data and the memory map in the memory unit.   
     
     
         16 . The document display apparatus according to  claim 15 ,
 wherein the controller controls the image processor to generate the first image data while excluding a previously stored image data corresponding to the first image data, by referring to the memory map.   
     
     
         17 . The document display apparatus of  claim 1 ,
 wherein said generation of the first image data corresponding to the current page comprises abstracting RGB data for a screen output.