Appeal No. 1999-0864 Page 16
Application No. 08/757,550
regarding the anticipation rejection, it is uncertain whether
Yamanaka darkens illumination according to any conditions
external to an environmental image. Although Sawachika
brightens or darkens an image according to detected
conditions external to a detected brightness, the brightness
is not that of the main image. To the contrary, the
brightness is that of outside light. As noted regarding
claims 5, 26, and 33, “the image viewed by the user will
brighten in response to bright outside ambient light,
conversely, if a low level of ambient light is present, the
image will darken accordingly.” Col. 5, ll. 35-38.
Because Sawachika changes an image according to
brightness of outside ambient light, we are not persuaded that
the teachings from the prior art would appear to have
suggested the limitations of "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
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