Invention Grant
- Patent Title: Image projection apparatus
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Application No.: US13308924Application Date: 2011-12-01
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Publication No.: US08217874B2Publication Date: 2012-07-10
- Inventor: Masayuki Abe
- Applicant: Masayuki Abe
- Applicant Address: JP
- Assignee: Canon Kabushiki Kaisha
- Current Assignee: Canon Kabushiki Kaisha
- Current Assignee Address: JP
- Agency: Rossi, Kimms & McDowell LLP
- Priority: JP2006-126572 20060428
- Main IPC: G09G3/36
- IPC: G09G3/36 ; G09G5/10 ; G09G5/02 ; G09G5/00

Abstract:
An image projection apparatus is disclosed which projects an image having a good color by reducing the influence of a lateral electric field in a liquid crystal display element (LCD). The apparatus includes three LCDs, each including two opposite electrodes. As the voltage applied to a liquid crystal layer is increased, retardation provided for light in each color band is increased. A controller controls an electrode application voltage in the first LCD such that, in a white display state, a liquid crystal application voltage (LCAV) in the first LCD is lower than the LCAVs in the second and third LCDs, and such that, in a black display state, the LCAV in the first LCD is higher than the LCAVs in the second and third LCDs and has a value from 1% to 30% of the LCAV in the first LCD in the white display state.
Public/Granted literature
- US20120139889A1 IMAGE PROJECTION APPARATUS Public/Granted day:2012-06-07
Information query
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