(19)
(11) EP 1 385 044 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION

(48) Corrigendum issued on:
12.05.2004 Bulletin 2004/20

(43) Date of publication:
28.01.2004 Bulletin 2004/05

(21) Application number: 03254628.5

(22) Date of filing: 23.07.2003
(51) International Patent Classification (IPC)7G02F 1/137, G09G 3/36
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
Designated Extension States:
AL LT LV MK

(30) Priority: 26.07.2002 GB 0217384
01.08.2002 GB 0217917

(71) Applicants:
  • VARINTELLIGENT (BVI) LIMITED
    Tortola, British Virgin Islands (VG)
  • Johnson, Terence Leslie
    London EC4A 1BZ (GB)

(72) Inventors:
  • Tsang, Fu On
    Tseung Kwan O Hong Kong (CN)
  • Lee, Richard C. H.
    Tseung Kwan O Hong Kong (CN)

(74) Representative: Johnson, Terence Leslie 
Edward Evans Barker, Clifford's Inn, Fetter Lane
London EC4A 1BZ
London EC4A 1BZ (GB)

   


(54) High contrast black-and-white cholesteric liquid crystal display


(57) The invention relates to a chiral nematic display configuration, typically in liquid crystal displays, comprising a chiral nematic display (1) of controllable planar structure and focal conic structure, characterised by the chiral nematic liquid crystal material (6) being between two transparent substrates (4,5) having conductive electrodes, the material (6) being between two elliptical polarisers (2,3;7,8) and there being an optical reflector (9). The invention achieves a high contrast black-and-white display. The displays in the embodiment are first and second optical mode configurations of the black-and-white chiral nematic displays.