US5859683A
Expired / Lapsed
US
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Transmissive liquid crystal display apparatus and method for producing the same
Assignee: Sharp Corp
•
Filing: 1996-09-27
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Granted: 1999-01-12
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Expires: 2016-09-27
Abstract
Abstract A transmissive liquid crystal display apparatus includes a liquid crystal layer interposed between a first substrate and a second substrate. The first substrate includes gate lines, source lines and switching devices provided in a vicinity of intersectional portions of the gate lines and the source lines. The switching devices include gate electrodes connected to the gate lines, source electrodes connected to the source lines and drain electrodes connected to pixel electrodes for applying a voltage to the liquid crystal layer. An interlayer insulating film having high transparency is provided above the switching devices, the gate lines and the source lines. The interlayer insulating film has roughness on its surface. A height difference of the roughness is 50 nm or less. The pixel electrode formed of a transparent conductive material is provided on the interlayer insulating film.
Inventors
- 👤 Yasunobu Tagusa
- 👤 Takayuki Shimada
- 👤 Yuzuru Kanemori
- 👤 Mikio Katayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:45
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G02F1/1362; G02F1/136227; G02F1/1333; G02F1/133345; H; H10; H10D; H10D30/00; H10D30/60; H10D30/67; H10D86/00; H10D86/40; H10D86/481; H10D86/60
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
138 words
A transmissive liquid crystal display apparatus comprising: a liquid crystal layer interposed between a first substrate and a second substrate, the first substrate including gate lines, source lines and switching devices provided in a vicinity of intersectional portions of the gate lines and the source lines, the switching devices including gate electrodes connected to the gate lines, source electrodes connected to the source lines and drain electrodes connected to pixel electrodes for applying a voltage to the liquid crystal layer, wherein an interlayer insulating film having high transparency is provided above the switching devices, the gate lines and the source lines, the interlayer insulating film having roughness on its surface, a height difference of the roughness being 50 nm or less, and the pixel electrodes formed of a transparent conductive material are provided on the interlayer insulating film.
Claim 2
Dependent Claim
138 words
A transmissive liquid crystal display apparatus comprising: a liquid crystal layer interposed between a first substrate and a second substrate, the first substrate including gate lines, source lines and switching devices provided in a vicinity of intersectional portions of the gate lines and the source lines, the switching devices including gate electrodes connected to the gate lines, source electrodes connected to the source lines and drain electrodes connected to pixel electrodes for applying a voltage to the liquid crystal layer, wherein an interlayer insulating film having high transparency is provided above the switching devices, the gate lines and the source lines, the interlayer insulating film having roughness on its surface, a height difference of the roughness being 50 nm or less, and the pixel electrodes formed of a transparent conductive material are provided on the interlayer insulating film.
Claim 3
Dependent Claim
30 words
A transmissive liquid crystal display apparatus according to claim 1, wherein a thickness of the interlayer insulating film is in the range of about 1.5 μm to about 5 μm.
Claim 4
Dependent Claim
36 words
A transmissive liquid crystal display apparatus according to claim 1, wherein a transmittance of light with a wavelength of about 400 nm to about 800 nm of the interlayer insulating film is about 90% or more.
Claim 5
Dependent Claim
29 words
A transmissive liquid crystal display apparatus according to claim 1, wherein a dielectric constant of the interlayer insulating film is in the range of about 2 to about 5.
Claim 6
Dependent Claim
92 words
A transmissive liquid crystal display apparatus according to claim 1, further comprising interconnecting electrodes for connecting the pixel electrodes and the drain electrodes, wherein the interlayer insulating film is provided above the switching devices, the gate lines, the source lines and the interconnecting electrodes, the pixel electrodes are provided in the interlayer insulating film so as to at least partially overlap at least either the gate lines or the source lines, and the interconnecting electrodes and the pixel electrodes are connected to each other via contact holes penetrating the interlayer insulating film.
Claim 7
Dependent Claim
39 words
A transmissive liquid crystal display apparatus according to claim 5, further comprising capacitor lines formed substantially parallel to the gate lines in central portions of the pixel electrodes, and wherein the contact holes are formed over the capacitor lines.
Claim 8
Dependent Claim
39 words
A transmissive liquid crystal display apparatus according to claim 6, wherein a width of the contact hole in a direction lateral to the capacitor line does not exceed a width of the capacitor line by more than 2 μm.
Claim 9
Dependent Claim
21 words
A transmissive liquid crystal display apparatus according to claim 5, wherein the interconnecting electrodes are formed of a transparent conductive film.
Claim 10
Dependent Claim
30 words
A transmissive liquid crystal display apparatus according to claim 5, wherein a metal nitride layer for connecting the interconnecting electrodes and the pixel electrodes is provided below the contact holes.
Claim 11
Dependent Claim
31 words
A transmissive liquid crystal display apparatus according to claim 1, further comprising a micro prism sheet on a substrate side opposite to another substrate side that faces the liquid crystal layer.
Claim 12
Dependent Claim
55 words
A transmissive liquid crystal display apparatus according to claim 1, wherein a line-like patterned light-shielding layer for defining a size of a pixel is provided on at least one of the first substrate and the second substrate, the light-shielding layer being provided so as not to extend beyond the gate lines and the source lines.
Claim 13
Dependent Claim
37 words
A transmissive liquid crystal display apparatus according to claim 1, being a direct sight type, wherein a ratio of a shorter side of the display apparatus to a longer side of the display apparatus is substantially 9:16.
Claim 14
Independent Claim
132 words
A method for producing a transmissive liquid crystal display apparatus comprising the steps of: on the first substrate including gate lines, source lines and switching devices provided in a vicinity of intersectional portions of the gate lines and the source lines, the switching devices including gate electrodes connected to the gate lines, source electrodes connected to the source lines and drain electrodes connected to pixel electrodes for applying a voltage to a liquid crystal layer, forming an interlayer insulating film having roughness of a height difference of about 50 nm or less by applying a material of an initial viscosity of about 100 cps or less onto the switching devices, the gate lines and the source lines; and forming pixel electrodes formed of a transparent conductive material on the interlayer insulating film.
Claim 15
Independent Claim
132 words
A method for producing a transmissive liquid crystal display apparatus comprising the steps of: on the first substrate including gate lines, source lines and switching devices provided in a vicinity of intersectional portions of the gate lines and the source lines, the switching devices including gate electrodes connected to the gate lines, source electrodes connected to the source lines and drain electrodes connected to pixel electrodes for applying a voltage to a liquid crystal layer, forming an interlayer insulating film having roughness of a height difference of about 50 nm or less by applying a material of an initial viscosity of about 100 cps or less onto the switching devices, the gate lines and the source lines; and forming pixel electrodes formed of a transparent conductive material on the interlayer insulating film.
Claim 16
Dependent Claim
33 words
A method for producing a transmissive liquid crystal display apparatus according to claim 13, wherein a thickness of the interlayer insulating film is in a range of about 1.5 μm to 5 μm.
Claim 17
Dependent Claim
40 words
A method for producing a transmissive liquid crystal display apparatus according to claim 13, wherein a transmittance of light with a wavelength of about 400 nm to about 800 nm of the interlayer insulating film is about 90% or more.
Claim 18
Dependent Claim
33 words
A method for producing a transmissive liquid crystal display apparatus according to claim 13, wherein a dielectric constant of the interlayer insulating film is in the range of about 2 to about 5.
Claim 19
Dependent Claim
126 words
A method for producing a transmissive liquid crystal display apparatus according to claim 13, the first substrate further including interconnecting electrodes for connecting the pixel electrodes and the drain electrodes, the interlayer insulating film forming step being a step of forming the interlayer insulating film above the switching devices, the gate lines, the source lines and the interconnecting electrodes, further comprising the step of forming contact holes penetrating the interlayer insulating film, the pixel electrode forming step being a step wherein the pixel electrodes are provided in the interlayer insulating film so as to at least partially overlap at least either the gate lines or the source lines, and the interconnection electrodes and the pixel electrodes are electrically connected to each other via the contact holes.
Claim 20
Dependent Claim
33 words
A method for producing a transmissive liquid crystal display apparatus according to claim 13, wherein the interlayer insulating film is formed of a photosensitive material and is patterned by exposure and alkali development.
Claim 21
Dependent Claim
43 words
A method for producing a transmissive liquid crystal display apparatus according to claim 13, wherein the step of applying the material formed into the interlayer insulating film is performed by a spin coating method, a roll coating method or a slot coating method.
Claim 22
Dependent Claim
35 words
A method for producing a transmissive liquid crystal display apparatus according to claim 19, wherein a rotation rate in the spin coating method is in a range of about 800 rpm to about 1500 rpm.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-01-11 | 2002-07-13 | 2003-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-01-11 | 2006-07-13 | 2007-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-01-11 | 2010-07-13 | 2011-01-12 | $7700.00 | Window Closed / Lapsed |