Television – Image signal processing circuitry specific to television – Gray scale transformation
Reexamination Certificate
2006-04-25
2006-04-25
Hsia, Sherrie (Department: 2614)
Television
Image signal processing circuitry specific to television
Gray scale transformation
C348S674000, C348S687000, C348S777000
Reexamination Certificate
active
07034895
ABSTRACT:
A light quantity control by a user can be synchronized to an automatic light quantity control depending on a luminance level of an input video signal. An image display apparatus partially passes or reflects a light from a light source which can control light quantity and displays an image based on a video signal externally input, and has a predetermined scope of an output level corresponding to a scope of control of light quantity of the light source, and includes: a light quantity control unit having a predetermined scope of an output level corresponding to the scope of control of the light quantity of the light source, and for outputting a reference signal at a level arbitrarily set by a user; an APL detection circuit for detecting the average luminance level for one frame (or one field) of the video signal, and outputting an amplification coefficient depending on the detected average luminance level; a multiplier circuit for multiplying the amplification coefficient by a reference signal, and outputting a control signal which is the multiplication result; and a power circuit for controlling the light quantity of the light source according to the control signal.
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Kuroda Atsushi
Okunuki Junichi
Hsia Sherrie
NEC Viewtechnology Ltd.
Sughrue & Mion, PLLC
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