Projection-type display device and software program

• US 7,889,153 B2
• Filed: 09/14/2006
• Issued: 02/15/2011
• Est. Priority Date: 03/02/2001
• Status: Active Grant

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Kitazawa, Tomofumi, Sasaki, Saburo, Kitaguchi, Takashi
• Primary Examiner(s): Abdulselam; Abbas I
• Application Number:
  US11/520,703
• Publication Number:
  US 20070008303A1
• Time in Patent Office: 1,615 Days
• Field of Search: 345/156, 345/173, 345/180, 345/7, 345/8, 345/9, 345/158, 348/218.1, 348/239, 348/744, 353 28- 30, 353 34- 35, 353/74, 349/11
• US Class Current: 345/7
• CPC Class Codes: G06F 1/1601 Constructional details related to the housing of computer displays, e.g. of CRT monitors, of flat displays constructional details related to flat displays integrated in a portable computer, e.g. laptop, handheld computer G06F1/1637; constructional details related to television receivers H04N5/64
• CPC Class Codes: G06F 3/033 Pointing devices displaced or positioned by the user , e.g. mice, trackballs, pens or joysticks; Accessories therefor digitisers characterised by the transducing means G06F3/041
• CPC Class Codes: G06F 3/0425 using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected tracking a projected light spot to determine a position on a display surface G06F3/0386
• CPC Class Codes: H04N 1/00283 with a television apparatus
• CPC Class Codes: H04N 1/195 the array comprising a two-dimensional array or a combination of two-dimensional arrays
• CPC Class Codes: H04N 2201/001 Sharing resources, e.g. processing power or memory, with a connected apparatus or enhancing the capability of the still picture apparatus
• CPC Class Codes: H04N 2201/0438 Scanning displays; Scanning large surfaces, e.g. projection screens, writing boards
• CPC Class Codes: H04N 9/3141 Constructional details thereof details not peculiar to the presence of an electronic spatial light modulator G03B21/14

Abstract

A projection surface on which a predetermined projection image is projected is provided; a writing surface on which an image can be drawn directly in a superimposing manner with a projection image displayed on the projection surface is provided; and a photography part photographing an image drawn on the writing surface by means of an image-pickup part comprising two-dimensionally-disposed pixels is provided.

Claims

1. A projection-type display device comprising:

a projection part;

a projection screen allowing an image from said projection part to transmit therethrough to display the same;

a writing sheet on which writing is carried out by using ink, and distinctly formed from the projection screen;

a photography part photographing a written image written on said writing sheet by using the ink, wherein;

said photography part takes a picture of an image written on the writing sheet from an opposite side of the writing sheet than on which the image is written; and

said writing sheet is in contact with one surface of said projection screen.

2. The projection-type display device as claimed in claim 1, wherein:

said ink comprises alcohol.

3. The projection-type display device as claimed in claim 2, wherein:

said writing sheet is located on the same side as that on which a user who draws an image onto said writing sheet exists; and

said display device further comprises an extracting part extracting a user-drawn image from an image photographed by said photography part.

4. The projection-type display device as claimed in claim 3, further comprising a combining part combining at least a part of the projection image projected onto said projection screen with the user-drawn image extracted by said extracting part.

5. The projection-type display device as claimed in claim 1, wherein the optical axis of said photography part is perpendicular to said writing sheet.

6. The projection-type display device as claimed in claim 1, further comprising a part making a correspondence between the projection image and drawn image.

7. The projection-type display device as claimed in claim 1, further comprising:

an input part inputting the projection image externally;

a recording part recording at least one of the projection image, user-drawn image and combined image; and

an output part outputting the user-drawn image externally.

8. The projection-type display device as claimed in claim 1, further comprising a blocking part blocking a light beam emitted from a projecting part projecting the light beam onto said projection screen so as to display the projection image thereon.

9. The projection-type display device as claimed in claim 1, wherein:

said writing sheet is divided into a plurality of areas;

said photography part takes a plurality of photographs of respective ones of the plurality of areas; and

a combining part is provided, and, thereby, a thus-obtained plurality of photographed images are combined.

10. The projection-type display device as claimed in claim 9, further comprising an input part through which instructions of at least one of whether or not a dividing photography is performed in which a part or all of said writing sheet is divided and each division is photographed, and the number of divisions in the dividing photography, are input.

11. The projection-type display device as claimed in claim 1, wherein:

a moving part moving a photography area of said photography part on said writing sheet is provided;

said photography part takes a photograph plural times in a manner such that the photography area thereof each time corresponds to a different division of said writing sheet; and

a combining part is provided, and, thereby, photographed images obtained through the plural times of photography are combined.

12. The projection-type display device as claimed in claim 11, further comprising a part displaying the photography area onto said projection screen.

13. The projection-type display device as claimed in claim 11, further comprising an input part through which instructions of at least one of whether or not a dividing photography is performed in which a part or all of said writing sheet is divided and each division is photographed, and the number of divisions in the dividing photography, are input.

14. The projection-type display device as claimed in claim 1, further comprising a lighting part illuminating said writing sheet from a side opposite to a side on which said photography part is provided.

15. The projection-type display device as claimed in claim 1, further comprising at least one lighting part illuminating said writing sheet from the first side on which said photography part is provided.

16. The projection-type display device as clamed in claim 1, further comprising a dispersion surface removably provided on a surface of said writing sheet opposite to a user who draws an image on said writing surface.

17. The projection-type display device as claimed in claim 1, further comprising:

a dispersion sheet comprising a dispersion area which covers all or a part of said writing part and a transparent area which transmits, to said writing sheet at least a part of a light beam emitted by a part which projects the projection image onto said projection screen; and

a moving part moving said dispersion sheet.

18. The projection-type display device as claimed in claim 1, operating based on instructions from a computer via a communication network.