Dot matrix-type display device with optical low-pass filter fixed to a member via an adhesive bonding

• US 6,147,732 A
• Filed: 08/24/1995
• Issued: 11/14/2000
• Est. Priority Date: 08/26/1994
• Status: Expired due to Fees

• Current Assignee: Omron Corporation
• Original Assignee: Omron Corporation
• Inventors: Nishizaki, Osamu, Aoyama, Shigeru
• Primary Examiner(s): Parker, Kenneth
• Application Number:
  US08/519,805
• Time in Patent Office: 1,909 Days
• Field of Search: 349/112, 349/117, 349/137, 349/162, 348/833, 354/599, 354/525, 354/626
• US Class Current: 349/112
• CPC Class Codes: G02B 27/46 Systems using spatial filters
• CPC Class Codes: G02B 5/3083 Birefringent or phase retarding elements G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001
• CPC Class Codes: G02F 1/133504 Diffusing, scattering, diffracting elements associated to illuminating devices G02F1/133606
• CPC Class Codes: G02F 1/133526 Lenses, e.g. microlenses or Fresnel lenses

Abstract

In a liquid crystal display device having an optical low-pass filter provided on a display screen, the optical low-pass filter is fixed to a liquid-crystal panel or a polarizing plate through a bonding layer having a refractive index different from the refractive index of the optical low-pass filter in a state where a surface having an optical function of the optical low-pass filter is directed toward a liquid-crystal panel or the polarizing plate. Further, in a liquid crystal display device having a phase plate, an optical low-pass filter is integrally formed on a phase plate. The occurrence of rainbow-shaped interference fringes is prevented. A liquid crystal display device is miniaturized and the number of components thereof is reduced. The fabrication precision of an optical low-pass filter is improved.

Claims

1. A dot matrix-type display device in which an optical low-pass filter is provided on a display screen, wherein

said optical low-pass filter is fixed to a member included in said display device through an adhesive bonding layer having a refractive index different from the refractive index of said optical low-pass filter in a state where a surface having an optical function of said optical low-pass filter is directed to said member, and

wherein a groove is formed on the outer periphery of the surface having an optical function of said optical low-pass filter, said groove preventing said adhesive bonding layer from sticking out with respect to sides of the surface.

2. A dot matrix-type display device in which an optical low-pass filter is provided on a display screen, wherein

said optical low-pass filter is fixed to a member included in said display device through an adhesive bonding layer having a refractive index different from the refractive index of said optical low-pass filter in a state where a surface having an optical function of said optical low-pass filter is directed to said member, and

wherein a sidewall is formed on the outer periphery of the surface having an optical function of said optical low-pass filter, said wall keeping a spacing between said optical low-pass filter and said member constant.

3. The dot matrix display device according to claim 2, wherein the sidewall has a same height at all locations.

4. A dot matrix-type display device in which an optical low-pass filter is provided on a display screen, wherein

said optical low-pass filter is fixed to a member included in said display device through an adhesive bonding layer having a refractive index different from the refractive index of said optical low-pass filter in a state where a surface having an optical function of said optical low-pass filter is directed to said member, and

wherein a spacer composed of a material having a refractive index substantially equal to that of said adhesive bonding layer is provided between the surface having an optical function of said optical low-pass filter and said member of said display device.

5. An optical device, comprising:

an optical low-pass filter; and

a liquid crystal panel coupled to the optical low-pass filter by way of a bonding resin,

wherein a groove is formed on the outer periphery portion of a surface of the optical low-pass filter having an optical function of the optical low-pass filter, said groove preventing said bonding resin from sticking out with respect to sides of the surface.

6. An optical device, comprising:

an optical low-pass filter; and

a liquid crystal panel coupled to the optical low-pass filter by way of a bonding resin,

wherein a wall is formed on the outer periphery portion of a surface of the optical low-pass filter having an optical function of the optical low-pass filter, said wall keeping a spacing between said optical low-pass filter and said liquid crystal panel constant.

7. A liquid-crystal display device, comprising:

a liquid-crystal panel;

two polarizing plates, whose polarization directions are perpendicular to each other, arranged with said liquid-crystal panel interposed therebetween;

a phase plate arranged between said polarizing plate on the side of a display screen and said liquid-crystal panel; and

an optical low-pass filter integrally molded within said phase plate.