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US5381255A Expired / Lapsed US ⏱️ 0.0 years remaining

Ferroelectric liquid crystal display with seal larger than cell gap plus half color filter thickness and 1.2-5mm from filter edge

Assignee: Canon Inc
•
Filing: 1993-12-29
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Granted: 1995-01-10
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Expires: 2013-12-29
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Abstract

Abstract There is disclosed a ferroelectric liquid crystal color-display panel capable of preventing defects in liquid crystal orientation, resulting from the glass substrate bending, particularly in the end portion of effective display area, by the use of a gap-retaining material, such as silica or alumina beads, in the sealant of the panel, wherein the diameter T of the gap retaining material satisfies a relation: t.sub.1 +(t.sub.2 /2)≦t in which t 1 is the cell gap in the display area and t 2 is the thickness of color filter provided in the display area.

Inventors

  • 👤 Kenji Ohnuma
  • 👤 Masaaki Suzuki
  • 👤 Keishi Danjoh

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 02:19
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1339; G02F1/1335; G02F1/133509; G02F1/133514

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 187 words
A liquid crystal color-display panel, comprising: a substrate which bears thereon a color filter having thereon a passivation layer, said passivation layer having thereon a first electrode: another substrate which bears thereon a second electrode intersecting the first electrode so as to form a pixel area at the intersecting area; and a liquid crystal being disposed between said substrates at a film thickness of 1-2 μm in said pixel area, wherein: said substrates are mutually adhered so as to form different cell gaps in said pixel area and in the peripheral area, the diameter T of a first gap-retaining material contained in sealant provided in the peripheral area satisfies a relationship: t.sub.1 +(t.sub.2 /2)≦T in which t 1 is the cell gap of the pixel area and t 2 is the thickness of said color filter, a second gap-retaining material is provided in a space between said pixel area and a sealed portion of the peripheral area, and an edge portion of the color filter is extended to a position of a distance of 1.2-5 mm from a position at the sealed portion of the peripheral area.
Claim 2
Dependent Claim 187 words
A liquid crystal color-display panel, comprising: a substrate which bears thereon a color filter having thereon a passivation layer, said passivation layer having thereon a first electrode: another substrate which bears thereon a second electrode intersecting the first electrode so as to form a pixel area at the intersecting area; and a liquid crystal being disposed between said substrates at a film thickness of 1-2 μm in said pixel area, wherein: said substrates are mutually adhered so as to form different cell gaps in said pixel area and in the peripheral area, the diameter T of a first gap-retaining material contained in sealant provided in the peripheral area satisfies a relationship: t.sub.1 +(t.sub.2 /2)≦T in which t 1 is the cell gap of the pixel area and t 2 is the thickness of said color filter, a second gap-retaining material is provided in a space between said pixel area and a sealed portion of the peripheral area, and an edge portion of the color filter is extended to a position of a distance of 1.2-5 mm from a position at the sealed portion of the peripheral area.
Claim 3
Dependent Claim 23 words
A liquid crystal color-display panel according to claim 1, wherein a diameter of said second gap-retaining material is equal to the diameter T.
Claim 4
Dependent Claim 34 words
A liquid crystal color-display panel according to claim 1, wherein said T, t 1 and t 2 and the thickness t 3 of said passivation layer satisfy a relationship: t.sub.1 +(t.sub.2 /2)≦T≦T.sub.1 +t.sub.2 +t.sub.3.
Claim 5
Dependent Claim 23 words
A liquid crystal color-display panel according to claim 1, wherein T, t 1 and t 2 satisfy a relationship: t.sub.1 +(t.sub.2 /2)≦T≦t.sub.1 +t.sub.2.
Claim 6
Dependent Claim 19 words
A liquid crystal color-display panel according to claim 1, wherein said liquid crystal is a chiral smectic liquid crystal.
Claim 7
Dependent Claim 26 words
A liquid crystal color-display panel according to claim 1, comprising a plurality of said color filter and a mask in an area between adjoining color filters.
Claim 8
Dependent Claim 16 words
A liquid crystal color-display panel according to claim 6, wherein said mask is a metal film.

References Cited (Backward Citations)

EP0288304A2 Cited
JPH01106016A Cited
JPH02170131A Cited
JPH0362019A Cited
US5079214A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1998-01-09 1998-07-11 1999-01-10 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2002-01-09 2002-07-11 2003-01-10 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2006-01-09 2006-07-11 2007-01-10 $7700.00 Window Closed / Lapsed

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