Appeal No. 1999-0864 Page 9
Application No. 08/757,550
darkens the illumination according to such detected
conditions, we are not persuaded that Yamanaka teaches the
limitations of “a circumstance detector for detecting
conditions external to the image display device under which a
user uses the image display device; and environmental image-
changing means for varying the environmental image according
to external conditions detected by said circumstance
detector[;]” “a circumstance detector for detecting a quantity
or brightness of light of the main image external to the
environmental image under which a user uses the image display
device; and environmental image-changing means for varying the
environmental image according to detected light quantity or
brightness of the main image detected by said circumstance
detector[;]” “a circumstance detector for detecting a sound
volume or sound of the display device under which a user uses
the image display device; and environmental image-changing
means for varying the environmental image according to the
sound volume or sound of the display device detected by said
circumstance detector[;]” or “detecting conditions under which
a user uses the image display device, said conditions being
external to the environmental image; and varying the
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