Optics: measuring and testing – Surface roughness
Reexamination Certificate
2006-05-18
2008-10-21
Pham, Hoa Q (Department: 2886)
Optics: measuring and testing
Surface roughness
C356S239200
Reexamination Certificate
active
07440118
ABSTRACT:
The present invention provides an apparatus and method for detecting flatness and/or unevenness of a surface of an overcoat layer on a colored pixel layer of a color filter with a high degree of accuracy. The apparatus includes: a light source34, placed almost directly above the surface of a plate30, for emitting an emission-line spectrum corresponding to at least one color of coloring particles in a color filter32; a photo-receiver36, placed obliquely upward with respect to the surface of the plate30and having a spectral sensitivity corresponding to the emission-line spectrum of the light source, for receiving reflected light from the color filter32on the plate30during inspection; and a detection means42for creating a brightness distribution for a color using a color signal output from the photo-receiver36as corresponding to its spectral sensitivity to detect the flatness (unevenness) of the surface of an overcoat layer16.
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Kohayase Atsushi
Uda Mitsuru
Yamashita Hiroshi
Cai Yuanmin
International Business Machines - Corporation
Pham Hoa Q
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