Appeal 2007-0996
Application 09/949,721
A. INVENTION
The invention at issue on appeal displays images. X-ray apparatuses,
computed radiography ("CR") apparatuses, computed tomography ("CT")
apparatuses, and magnetic resonance imaging ("MRI") apparatuses are used
in medical fields. (Specification 1.) In many cases, a limiter narrows a
radiation field so that only necessary parts of a subject are exposed thereto.
(Id. 4.) When the limiter is used, an image of the subject is recorded in a
"radiation field area" of a recording medium such as an X-ray film or a
phosphor sheet. The radiation field area refers to an area of the recording
medium within the outline of an opening in the limiter. Conversely,
radiation does not reach the area of the recording medium outside the
outline; this "extra-radiation field area" remains unexposed. (Id. 5.) If X-
ray films are placed on a viewer, or if images are electrically displayed on a
screen, however, the extra-radiation field area allows unnecessary light to
enter into the eyes of an observer, which hinders observation of the images.
(Id. 7.)
In contrast, the Appellant's invention includes a flat display and a
backlight. Based on data concerning the image to be displayed, a controller
turns off the part of the backlight corresponding to a non-image area. (Id. 8.)
B. ILLUSTRATIVE CLAIM
Claim 1, which further illustrates the invention, follows:
1. An image display apparatus comprising:
a flat-shaped transmission display device for displaying
on a display screen thereof an image based on image signal data
supplied from an image data supplying source;
2
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