Projection type display device

• US 6,939,013 B2
• Filed: 10/20/2003
• Issued: 09/06/2005
• Est. Priority Date: 10/21/2002
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Asao, Yasufumi
• Primary Examiner(s): Mathews, Alan A.
• Assistant Examiner(s): SEVER, ANDREW T
• Application Number:
  US10/690,493
• Publication Number:
  US 20040136204A1
• Time in Patent Office: 687 Days
• Field of Search: 349/62, 349/202, 349/197, 349/196, 349/5, 349/10, 349/61, 359/197, 359201-203, 359212-214, 359216-221, 353/34, 353/31, 353/37, 353/81, 353/85, 353/89, 353/97, 353/98, 353/99, 353/101, 353/122
• US Class Current: 353/98
• CPC Class Codes: G09G 2310/024 Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2320/02 Improving the quality of display appearance
• CPC Class Codes: G09G 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• CPC Class Codes: G09G 2320/0271 Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/002 to project the image of a two-dimensional display, such as an array of light emitting or modulating elements or a CRT
• CPC Class Codes: G09G 3/025 with scanning or deflecting the beams in two directions or dimensions
• CPC Class Codes: G09G 3/342 using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix
• CPC Class Codes: H04N 5/7408 Direct viewing projectors, e.g. an image displayed on a video CRT or LCD display being projected on a screen

Abstract

A projection type display device includes a light source, a picture information display element, and a light deflection device that deflects light from the light source and irradiates the deflected light on one region of the picture information display element. The light deflection device scans the deflected light over an entire area of the picture information display element and an area outside of an effective display area of the picture information display element.

Claims

1. A projection type display device comprising:

a light source;

a picture information display element; and

a light deflection device that deflects light from the light source and irradiates the deflected light on one region of the picture information display element,

wherein the light deflection device scans the deflected light over an entire area of the picture information display element and an area outside of an effective display area of the picture information display element.

2. A projection type display device according to claim 1, wherein a scanning speed of the light deflection device is changed according to picture information and a period in which the area outside of the effective display area is irradiated with the light is controlled according to a luminance level of the picture information.