Liquid crystal display device

• US 7,583,335 B2
• Filed: 01/23/2003
• Issued: 09/01/2009
• Est. Priority Date: 06/27/2000
• Status: Expired due to Fees

• Current Assignee: Citizen Watch Co Limited (Citizen Electronics Company Limited)
• Original Assignee: Citizen Holdings Co., Ltd. (Citizen Electronics Company Limited)
• Inventors: Sekiguchi, Kanetaka
• Primary Examiner(s): RUDE, TIMOTHY L
• Application Number:
  US10/349,019
• Publication Number:
  US 20030107692A1
• Time in Patent Office: 2,413 Days
• Field of Search: 349 56-155
• US Class Current: 349/112
• CPC Class Codes: G02F 1/133504 Diffusing, scattering, diffracting elements associated to illuminating devices G02F1/133606

Abstract

A liquid crystal display device comprising: a first substrate (1) made of a transparent material, provided with signal electrodes and/or display electrodes (9) formed on one face thereof; a second substrate (2) made of a transparent material, provided with opposed electrodes (12) formed thereon; and liquid crystal sealed in-between the first substrate (1) and the second substrate (2) oppositely disposed opposite to each other with a predetermined gap interposed therebetween such that each of the signal electrodes or the display electrodes (9) face each of the opposed electrodes (12) so as to form a pixel. Further, a white diffusing film (22) and a reflector (25) are disposed in that order from of the first substrate (1) side on the second substrate (2). The white diffusing film (22) having the characteristics of allowing circularly polarized light to pass therethrough substantially as the circularly polarized light, and having a substantially equal transmittance for light components at respective wavelengths in the wavelength range of visible light, effecting improving whiteness of a reflection-type liquid crystal display device.

Claims

1. The liquid crystal display device comprising:

a first substrate provided with signal electrodes or display electrodes formed on one surface thereof, a second substrate provided with opposed electrodes formed thereon; and

liquid crystal sealed in-between the first substrate and the second substrate, oppositely disposed to each other with a predetermined gap interposed therebetween, characterized in that

a reflector is disposed on the second substrate,

one white diffusing film is disposed on a liquid crystal side of the second substrate,

a polarizing film is disposed on a visible side of the first substrate, and

another white diffusing film is disposed between the first substrate and the polarizing film,

wherein a plurality of pixel portions are provided, and regions of said one white diffusing film, corresponding to respective pixel portions, have a transmittance higher than that for regions other than the respective pixel portions.

2. The liquid crystal display device comprising:

a first substrate provided with signal electrodes or display electrodes formed on one surface thereof, a second substrate provided with opposed electrodes formed thereon; and

liquid crystal sealed in-between the first substrate and the second substrate, oppositely disposed to each other with a predetermined gap interposed therebetween, characterized in that

a reflector is disposed on the second substrate,

one white diffusing film is disposed on a liquid crystal side of the second substrate,

a polarizing film is disposed on a visible side of the first substrate, and

another white diffusing film is disposed between the first substrate and the polarizing film,

wherein

a plurality of pixel portions are provided, and

said one white diffusing film is provided in regions corresponding to regions other than respective pixel portions, and not provided in regions corresponding to the respective pixel portions.