Video information display system and display apparatus applicable to the same

• US 7,304,629 B2
• Filed: 10/21/2003
• Issued: 12/04/2007
• Est. Priority Date: 03/15/1994
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Kochi, Tetsunobu, Miyawaki, Mamoru
• Primary Examiner(s): LEWIS, DAVID LEE
• Application Number:
  US10/688,959
• Publication Number:
  US 20040080616A1
• Time in Patent Office: 1,505 Days
• Field of Search: 345 55-100, 345204-214
• US Class Current: 345/99
• CPC Class Codes: G02F 1/133553 Reflecting elements associated to illuminating devices G02F1/133605
• CPC Class Codes: G02F 1/136277 formed on a semiconductor substrate, e.g. of silicon
• CPC Class Codes: G09G 2360/18 Use of a frame buffer in a display terminal, inclusive of the display panel
• 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 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: G09G 5/006 Details of the interface to the display terminal specific for a display terminal using a CRT G09G1/167; using a flat panel G09G3/2096; circuits for interfacing with colour displays G09G5/04
• CPC Class Codes: H04N 5/7441 the modulator being an array of liquid crystal cells
• CPC Class Codes: H04N 7/148 Interfacing a video terminal to a particular transmission medium, e.g. ISDN
• CPC Class Codes: H04N 9/3147 Multi-projection systems displays in general H04N9/12; video walls G06F3/1446, G09G2300/026

Abstract

A display apparatus includes a plurality of display systems each having a light source, a reflection type liquid crystal panel and an optical system, a screen displaying superimposingly the images obtained from the plurality of display systems, and a selector for selecting at least one display system for displaying from the plurality of display systems. The display apparatus also includes a switch for switching the selection of the display systems in the selector, an interface to at least one information terminal, and an image processing circuit section. An optical axis of the optical system is inclined relative to a surface of the screen for displaying projected images, where a maximum distance between the screen and an exit pupil is b2, and a minimum distance between the screen and the exit pupil is b1, a maximum distance between the liquid crystal panel and an entrance pupil of the optical system is a2, and a minimum distance between the liquid crystal panel and the entrance pupil of the optical system is a1. The inclination of the liquid crystal panel is adjusted to minimize the difference between b1/a1 and b2/a2.

Claims

1. An active matrix liquid crystal display apparatus, comprising:

a device substrate provided with pixel electrodes and switching devices arranged on respective sites defined by data signal wirings and scan signal wirings, and an opposite substrate provided with opposite electrodes arranged on the respective sites located directly opposite to the corresponding pixel electrodes, with

said scan signal wirings being grouped into alternately arranged first and second scan signal wirings,

first pixel electrodes selected by said first scan signal wirings and second pixel electrodes selected by said second scan signal wirings being spatially displayed from each other, and

said data signal wirings being grouped into alternately arranged first and second data signal wirings, and with

said first pixel electrodes being connected to said first data wirings by way of said switching devices, said second pixel electrodes being connected to said second data wirings by way of said switching devices; and

first and second transfer switches being driven by a same shift register, said first data wirings being connected to an image signal input terminal through said first transfer switch, said second data wirings being connected to said image signal input terminal through said second transfer switch and an image signal delay circuit, and said image signal delay circuit having means for delaying an image signal according to the spatial displacement between said first and second pixel electrodes.

2. An active matrix liquid crystal display apparatus according to claim 1, wherein said switching devices operate as three terminal type transistors and said opposite electrodes are a common electrode.

3. An active matrix liquid crystal display apparatus according to claim 1, wherein said switching devices operate as two terminal type diodes and said opposite electrodes operate for said scan signal wirings.

4. An active matrix liquid crystal display apparatus according to claim 1, wherein said first data signal wirings and said second signal wirings are formed in a same layer.

5. An active matrix liquid crystal display apparatus according to claim 1, wherein said first data signal wirings and said second data signal wirings are formed in different layers.

6. An active matrix liquid crystal display apparatus according to claim 1, wherein said pixel electrodes are formed on a front surface of an insulation layer, and said switching devices are formed on a rear surface of said insulation layer.

7. An active matrix liquid crystal display apparatus according to claim 1, wherein reflection electrodes are arranged on either of said device substrate or said opposite substrate.

8. An active matrix liquid crystal display apparatus according to claim 1, further comprising peripheral circuits for applying a voltage to said switching devices arranged on said device substrate, with said peripheral circuits made of monocrystalline Si and said switching devices made of polycrystalline Si.

9. An active matrix liquid crystal display apparatus according to claim 1, further comprising a thin film having a tensile stress for supporting said switching devices.