§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US5117299A Expired / Lapsed US ⏱️ 0.0 years remaining

Liquid crystal display with a light blocking film of hard carbon

Assignee: Ricoh Co Ltd
•
Filing: 1991-09-30
•
Granted: 1992-05-26
•
Expires: 2011-09-30
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract Disclosed herein is a liquid crystal display comprising liquid crystal material sandwiched between two substrates, a plurality of picture element electrodes disposed on at least one of the substrates, a lead electrode connected with the picture element electrodes by means of at least one conductor-insulator-conductor device, and a light-shielding layer disposed in a region other than the display region on at least one of the substrates, the insulator being a hard carbon film. The insulator may simultaneously serve as a light-shielding layer, wherein a hard carbon film having a thickness of 1100 to 8000 Å, a specific resistivity (ρ) of 10 6 to 10 13 ohm cm, an optical band gap (Egopt) of 1.0 to 3.0 eV, a hydrogen amount in the film (C H ) of 10 to 50 atom %, an SP 3 /SP 2 ratio of 2-4, a Vickers hardness of 2500 to 9500 kg·mm -2 , a refractive index (n) of 1.9 to 2.4, a defect density of 10 17 to 10 19 cm -3 , a specific dielectric constant of 2 to 6, and an average optical density in the visible ray region of not less than 0.5 is used.

Inventors

  • 👤 Hitoshi Kondo
  • 👤 Yuji Kimura
  • 👤 Eiichi Ohta

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 20:59
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G02F1/1362; G02F1/136209; G02F1/1365; Y; Y10; Y10T; Y10T428/00; Y10T428/30

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 193 words
A liquid crystal display comprising liquid crystal material sandwiched between two substrates, a plurality of picture element electrodes disposed on at least one inner surface of said substrates, a lead electrode connected with said picture element electrodes by means of at least one conductor-insulator-conductor device, wherein said insulator is a hard carbon film disposed in all regions of said liquid crystal display other than display regions above said picture element electrodes as a light-shielding layer, said hard carbon film having a thickness of from 1100 to 8000 Å, a specific resistivity (ρ) of from 10 6 to 10 13 ohm·cm, an optical band gap (Egopt) of from 1.0 to 3.0 eV, a hydrogen amount in the film (C H ) of from 10 to 50 atom %, an SP 3 /SP 2 ratio of 2-4, a Vickers hardness of from 2500 to to 9500 kg·mm -2 , a refractive index (n) of from 1.9 to 2.4, a defect density of from 10 17 to 10 19 cm -3 , a specific dielectric constant of from 2 to 6, and an average optical density in the visible ray region of not less than 0.5.
Claim 2
Dependent Claim 193 words
A liquid crystal display comprising liquid crystal material sandwiched between two substrates, a plurality of picture element electrodes disposed on at least one inner surface of said substrates, a lead electrode connected with said picture element electrodes by means of at least one conductor-insulator-conductor device, wherein said insulator is a hard carbon film disposed in all regions of said liquid crystal display other than display regions above said picture element electrodes as a light-shielding layer, said hard carbon film having a thickness of from 1100 to 8000 Å, a specific resistivity (ρ) of from 10 6 to 10 13 ohm·cm, an optical band gap (Egopt) of from 1.0 to 3.0 eV, a hydrogen amount in the film (C H ) of from 10 to 50 atom %, an SP 3 /SP 2 ratio of 2-4, a Vickers hardness of from 2500 to to 9500 kg·mm -2 , a refractive index (n) of from 1.9 to 2.4, a defect density of from 10 17 to 10 19 cm -3 , a specific dielectric constant of from 2 to 6, and an average optical density in the visible ray region of not less than 0.5.
Claim 3
Dependent Claim 21 words
The liquid crystal display of claim 1, wherein said hard carbon film has a thickness of from 2000 to 6000 Å.
Claim 4
Dependent Claim 21 words
The liquid crystal display of claim 2, wherein said hard carbon film has a thickness of from 3000 to 6000 Å.
Claim 5
Dependent Claim 49 words
A liquid crystal display according to claim 1, wherein the hard carbon film is doped with a group III element, a group IV element other than carbon, a group V element, an alkali metal element, an alkaline earth metal element, nitrogen, oxygen, a chalcogen element or a halogen element.

References Cited (Backward Citations)

US4436797A Cited
US4486286A Cited
US4597844A Cited
US4904056A Cited
JPS6364023A Cited
JPS63175802A Cited
US4943143A Cited
US4932331A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1995-05-26 1995-11-25 1996-05-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1999-05-26 1999-11-25 2000-05-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2003-05-26 2003-11-25 2004-05-26 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag