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Display device having diffraction grating
| Details |
Inventors: Suzuki, Toshihiro; Iigahama, Yukio; Yamaguchi, Hisashi; Gotoh, Takeshi; Hamada, Tetsuya; Hayashi, Keiji; Tomita, Junji; Aritake, Hirokazu; Kobayashi, Tetsuya; Sugawara, Mari; Fukuhara, Motohiko; Yoshioka, Koji; Takahara, Kazuhiro;
Assignee: Fujitsu Limited (Kawasaki, JP)
Primary Examiner: Sikes; William L.
Assistant Examiner: Ton; Toan
Attorney, Agent or Firm: Greer, Burns & Crain Ltd.
A display device including a diffraction grating from which a diffracted light of the zeroth order and a diffracted light of the first order having different color light components emerge to establish color separation. An array of micro-lenses is arranged on a liquid crystal panel. The liquid crystal panel has a plurality of picture elements and each picture element includes a plurality of color display dots. The color display dots in each picture element are arranged in the vertical relationship and in the order of wavelength of the light. A green light component of diffracted light of the first order is made incident normal to the liquid crystal panel, and the diffracted light of the zeroth order passes through the liquid crystal panel at a greater angle relative to the normal to the liquid crystal panel. |
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DETAILED DESCRIPTION The object of the present invention is to provide a display device having a diffraction grating which can realize a high definition display, by effectively treating a diffracted light of zeroth order and a diffracted light of first order passing through the diffraction grating.
Another object of the present invention is to provide a projection type display device having a diffraction grating and a light source which can supply light beams as parallel as possible to the diffraction grating.
A further object of the present invention is to provide a display device in which the disposition of display dots is improved to provide a high definition display.
According to one aspect of the present invention, there is provided a display device having a diffraction grating arranged such that a diffracted light of the zeroth order and a diffracted light of the first order having different color light components emerge from the diffraction grating, a condenser means, and a light valve arranged to receive the light passing through the diffraction grating and the condenser means to modulate the light to form an image.
The light valve has a plurality of minute unit regions, each unit region including a plurality of color display dots, the display dots in each unit region being arranged in a vertical relationship and in the order of wavelength of the light.
An incident angle of the diffracted light of zeroth order made incident to the light valve is greater than incident angles of the color light components of diffracted light of first order made incident to the light valve.
The diffracted light of first order diffracted at a certain area of the diffraction grating passes through the display dots in one unit region.
The diffracted light of the zeroth order passing through said certain area of the diffraction grating passes through a different unit region from said one unit region.
In this arrangement, the display dots in one unit region constitute one picture element.
The diffracted light of the zeroth order passes through the different unit region from the unit region through which the diffracted light of first order passes
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Optical Systems 
