High resolution LCD display system

• US 4,952,036 A
• Filed: 07/12/1989
• Issued: 08/28/1990
• Est. Priority Date: 06/07/1989
• Status: Expired due to Fees

• Current Assignee: InFocus Corporation (Lap-Shun Hui, MBA)
• Original Assignee: InFocus Corporation (Lap-Shun Hui, MBA)
• Inventors: Conner, Arlie R., Gulick, Paul E.
• Primary Examiner(s): Miller, Stanley D.
• Assistant Examiner(s): Mai, Huy K.
• Application Number:
  US07/378,997
• Time in Patent Office: 412 Days
• Field of Search: 350/335, 350/333, 350/336, 350/345, 350/334, 350/331 R, 350/347 E
• US Class Current: 349/82
• CPC Class Codes: G02F 1/133526 Lenses, e.g. microlenses or Fresnel lenses
• CPC Class Codes: G02F 1/133533 Colour selective polarisers G02F1/1347 takes precedence
• CPC Class Codes: G02F 1/134336 Matrix
• 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 1/13473 for wavelength filtering or for colour display without the use of colour mosaic filters
• 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 1/1613 for portable computers cooling arrangements therefor G06F1/203; constructional details or arrangements for pocket calculators, electronic agendas or books G06F15/0216; constructional details of portable telephone sets: with several bodies H04M1/0202
• CPC Class Codes: G06F 1/203 for portable computers, e.g. for laptops
• CPC Class Codes: G06F 2200/1612 Flat panel monitor

Abstract

A high resolution LDC display is fabricated with a plurality of panels. Each panel has active rows and inactive rows. The panels are stacked and aligned so that each active row is in alignment with inactive rows in all the other panels of the stack. The parallax problem inherent with this stacked cell approach is eliminated by a lens system that collimates light illuminating the stacked assembly.

Claims

1. A method of providing a high resolution display comprising the steps:

providing a first liquid crystal cell of the supertwisted nematic type;

operating the first liquid crystal cell to define a first display row;

compensating wavelength-dependent optical effects exhibited by the first display row by providing a second liquid-crystal cell of the supertwisted nematic type in an optical assembly with said first cell, said second cell having opposite twist sense from the first cell and presenting a passive area in superimposed relationship with the first display row, said passive area in the second cell providing an opposite twist counterpart to the first display row, thereby compensating for the first display row'"'"'s wavelength dependent effects;

operating said second liquid crystal cell to define a second display row;

compensating wavelength-dependent optical effects exhibited by the second display row by providing in the first liquid crystal cell a passive area in superimposed relationship with the second display row, said passive area providing an opposite twist counterpart to the second display row, thereby compensating for its wavelength dependent effects.

2. The method of claim 1 which further includes:

providing a source of illumination;

collimating the illumination;

passing the collimated light through the first and second cells; and

dispersing the collimated light after passing through the first and second cells.