Field sequential color display apparatus

• US 7,505,015 B2
• Filed: 12/02/2005
• Issued: 03/17/2009
• Est. Priority Date: 03/16/2001
• Status: Expired due to Fees

• Current Assignee: Olympus Optical Corporation Limited (Olympus Corporation)
• Original Assignee: Olympus Optical Corporation Limited (Olympus Corporation)
• Inventors: Shimada, Naoto
• Primary Examiner(s): Dinh; Duc Q
• Application Number:
  US11/293,557
• Publication Number:
  US 20060082603A1
• Time in Patent Office: 1,201 Days
• Field of Search: 345/87, 345/88, 345/89, 345 98-102, 345/690, 345/694, 345/698
• US Class Current: 345/87
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133622 Colour sequential illumination
• CPC Class Codes: G02F 1/13363 Birefringent elements, e.g. for optical compensation
• CPC Class Codes: G02F 1/13471 in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells G02F1/13475 takes precedence
• CPC Class Codes: G02F 2203/02 reflective
• CPC Class Codes: G09G 2310/0235 Field-sequential colour display
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2340/0407 Resolution change, inclusive of the use of different resolutions for different screen areas
• CPC Class Codes: G09G 3/001 using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background slide projectors per se G03B23/00 = 42 HP
• CPC Class Codes: G09G 3/007 Use of pixel shift techniques, e.g. by mechanical shift of the physical pixels or by optical shift of the perceived pixels
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/36 using liquid crystals
• CPC Class Codes: H04N 9/22 using the same beam for more than one primary colour information H04N9/27 takes precedence
• CPC Class Codes: H04N 9/30 using solid-state colour display devices
• CPC Class Codes: H04N 9/3114 by using a sequential colour filter producing one colour at a time

Abstract

A field sequential color display apparatus for sequentially displaying RGB field images so that a color frame image can be observed, comprising: an LCD display device for displaying RGB field images; a timing generation/control circuit for controlling the order of RGB field images to be displayed on the LCD display device; a pixel shifting unit for causing the beam of each pixel displayed on the LCD display device to be shifted by each frame image so as to enhance the resolution of image observed by a viewer; and an optical system for making it possible to display an image before shifted at the pixel shifting unit and an image after the shift. Among the RGB field images, the G field image having highest spectral luminous efficiency is displayed at an intermediate order within the frame images so that leakage thereof is not caused by the pixel shifting operation.

Claims

1. A field sequential color display apparatus for sequentially displaying field images corresponding to a plurality of colors to display a plurality of color frame images, wherein each of the field images is a single-color image and each of said color frame images is formed from a plurality of the field images, said field sequential color display apparatus comprising:

display means for sequentially displaying the single-color field images one-by-one;

display control means for controlling a display order in which the field images are displayed by the display means;

pixel shifting means, including a liquid crystal cell, for shifting alternating ones of the color frame images, by shifting a beam from each pixel displayed on the display means for a shifted one of the color frame images; and

optical means for transmitting to a viewer both shifted color frame images and unshifted color frame images;

wherein the display control means controls display of the field images so as to minimize, to a greatest possible extent, an overlap amount of a transition period of the pixel shifting means during which the beam of said each pixel is shifted with display periods of each of the field images.

2. A field sequential color display apparatus for sequentially displaying field images corresponding to a plurality of colors to display a plurality of color frame images, wherein each of the field images is a single-color image and each of said color frame images is formed from a plurality of the field images, said field sequential color display apparatus comprising:

display means for sequentially displaying the single-color field images one-by-one;

display control means for controlling a display order in which the field images are displayed by the display means;

pixel shifting means, including a liquid crystal cell, for shifting alternating ones of the color frame images, by shifting a beam from each pixel displayed on the display means for a shifted one of the color frame images; and

optical means for transmitting to a viewer both shifted color frame images and unshifted color frame images;

wherein display periods of a plurality of the field images overlap with a transition period of the pixel shifting means during which the beam of said each pixel is shifted, and the display control means controls display of the field images so as to minimize an amount of overlap of the transition period with one of the display periods corresponding to a color having a higher spectral luminous efficiency than the color of any other of the display periods overlapping the transition period.

3. A field sequential color display apparatus for sequentially displaying field images corresponding to a plurality of colors to display a plurality of color frame images, wherein each of the field images is a single-color image and each of said color frame images is formed from a plurality of the field images, said field sequential color display apparatus comprising:

display means for sequentially displaying the single-color field images one-by-one;

display control means for controlling a display order in which the field images are displayed by the display means;

pixel shifting means, including a liquid crystal cell, for shifting alternating ones of the color frame images, by shifting a beam from each pixel displayed on the display means for a shifted one of the color frame images; and

optical means for transmitting to a viewer both shifted color frame images and unshifted color frame images;

wherein the display control means controls display of the field images such that each said color frame image includes an undisplayed period, during which nothing is displayed for one field period, at a beginning or an end of the plurality of field images making up the color frame image, so as to prevent color mixture of the field images due to delay in response by the pixel shifting means.