Touch drawing display apparatus and operation method thereof, image display apparatus allowing touch-input, and controller for the display apparatus

Abstract

An electronic blackboard includes a display panel and a touch-panel, draws a line corresponding to a track formed by movement of the touched position on the displayed image, and erases an erroneously drawn line corresponding to a track specifying an operation other than drawing. In another aspect, an electronic blackboard includes a touch screen, a scroll unit for scrolling an image on the display screen when positions of multi-touch move in one same direction, and a page switching unit for detecting, after detection of multi-touch input, that a finger is moved away, and executing a process of returning the image on the display screen to a state before scrolling or a process of switching the image by one page in accordance with the moving direction of multi-touch positions, depending on whether the amount of movement of touch inputs is equal to or smaller than a threshold value.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This nonprovisional application claims priority under 35 U.S.C. §119(a) on Patent Applications No. 2011-027236 and No. 2011-027237 filed in Japan on Feb. 10, 2011, the entire contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an image display apparatus having a display device and an input device integrated together, allowing touch-input. More specifically, the present invention relates to a touch drawing display apparatus that has functions of drawing operation and other operation regarding touch operations, and operation method thereof, as well as to an image display apparatus switching images page by page by touching and sliding images with a plurality of fingers and the like and a controller for the display apparatus.[0004]2. Description of the Background Art[0005]As an image display apparatus allowing touch-input, a so-called electronic...

AI Technical Summary

Benefits of technology

[0016]In view of the problems described above, it is desired to provide a touch drawing display apparatus and operation method thereof that can maintain correct drawing of images even when a touch operation other than the image drawing is made in the drawing mode.

[0017]Further, it is desired to provide an image display apparatus allowing touch-input that allows the user to intuitively understand the method of page-by-page switching of screen images using multi-touch and that can prevent any trouble of display when an erroneous operation is made on such an occasion.

[0018]Further, it is desired to provide an image display apparatus allowing touch-input that allows the user to intuitively understand the method of page-by-page switching of screen images using multi-touch, and of which switching operation is easy.

Problems solved by technology

There is a problem that recognition of an original image becomes difficult when writing is repeated on the same screen image.

Any time lag is stressful for the user.

This problem is not limited to the electronic blackboard, and it occurs in display devices allowing display of images drawn by touching, such as tablet-type terminals.

In an electronic blackboard allowing display of a plurality of pages of images, how to switch pages easily is an issue.

This method, however, is problematic particularly when the screen image is large, as it becomes difficult for the user to press the button depending on the position of the user.

There is still a problem to be solved.

Specifically, pages may be turned erroneously while normal input is being done.

Particularly when input is being done using a finger, it is possible that a finger other than the finger used for input happens to touch the screen surface and is detected as the multi-touch slide input and, as a result, a page is turned unintentionally.

Images