Patent US6002458A successfully refreshed from Google Patents.
US6002458A
Expired / Lapsed
US
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Liquid crystal display device
Assignee: Seiko Epson Corp
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Filing: 1997-04-24
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Granted: 1999-12-14
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Expires: 2017-04-24
Abstract
Abstract A liquid crystal display device has a light source and includes a two-dimensional light-emitting element array plate formed of a plurality of light-emitting elements arranged in a plane array, and a liquid crystal panel having a plurality of pixels. Each of the pixels corresponds to each of the light-emitting elements. A light-projecting portion of each of the light-emitting elements is disposed within a light-transmitting region of the corresponding pixel.
Inventors
- 👤 Takeo Kaneko
- 👤 Osamu Yokoyama
- 👤 Satoshi Nebashi
- 👤 Tatsuya Shimoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:25
CPC Classifications
G; G09; G09F; G09F9/00; G09F9/30; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/133621; G02F1/133602; G02F1/133603
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
267 words
A liquid crystal display device comprising: a two-dimensional light-emitting element array plate formed of a plurality of light-emitting elements, said light-emitting elements being arranged in a plane array, each of said light-emitting elements having a light-projecting portion; and a liquid crystal panel having a plurality of pixels, each of said pixels corresponding to one of said light-emitting elements, each of said light-emitting elements corresponding to one of said pixels, said light-projecting portion of each of said light-emitting elements being disposed within a light-transmitting region of each of said pixels; wherein each of said light-emitting elements is a semiconductor light-emitting element comprising at least three layers of a first, second and third light-emitting portions and four layers of a first, second, third and fourth reflective mirrors disposed in a depthwise direction, said first, second, and third light-emitting portions emitting light of first, second, and third different wavelengths respectively that satisfy a relationship: first wavelength<second wavelength<third wavelength, said first reflective mirror, said first light-emitting portion, said second reflective mirror, said second light-emitting portion, said third reflective mirror, said third light-emitting portion, and the fourth reflective mirror forming a multi-layer structure in that sequence, said first reflective mirror having a less reflectivity than said fourth reflective mirror to form said light-projecting portion, said second reflective mirror reflecting said light of said first wavelength, said second reflective mirror passing said light of said second and third wavelengths, said third reflective mirror reflecting said light of said second wavelength, said third reflective mirror passing said light of said third wavelength, and said fourth reflective mirror reflecting said light of said third wavelength.
Claim 2
Dependent Claim
267 words
A liquid crystal display device comprising: a two-dimensional light-emitting element array plate formed of a plurality of light-emitting elements, said light-emitting elements being arranged in a plane array, each of said light-emitting elements having a light-projecting portion; and a liquid crystal panel having a plurality of pixels, each of said pixels corresponding to one of said light-emitting elements, each of said light-emitting elements corresponding to one of said pixels, said light-projecting portion of each of said light-emitting elements being disposed within a light-transmitting region of each of said pixels; wherein each of said light-emitting elements is a semiconductor light-emitting element comprising at least three layers of a first, second and third light-emitting portions and four layers of a first, second, third and fourth reflective mirrors disposed in a depthwise direction, said first, second, and third light-emitting portions emitting light of first, second, and third different wavelengths respectively that satisfy a relationship: first wavelength<second wavelength<third wavelength, said first reflective mirror, said first light-emitting portion, said second reflective mirror, said second light-emitting portion, said third reflective mirror, said third light-emitting portion, and the fourth reflective mirror forming a multi-layer structure in that sequence, said first reflective mirror having a less reflectivity than said fourth reflective mirror to form said light-projecting portion, said second reflective mirror reflecting said light of said first wavelength, said second reflective mirror passing said light of said second and third wavelengths, said third reflective mirror reflecting said light of said second wavelength, said third reflective mirror passing said light of said third wavelength, and said fourth reflective mirror reflecting said light of said third wavelength.
Claim 3
Dependent Claim
73 words
The liquid crystal display of claim 1, wherein said light of said first, second and third wavelengths is emitted in a sequence at a predetermined period, said liquid crystal panel is driven in synchronization with said period, and a plurality of colors can be displayed by utilizing an after-image effect of human eyes in response to time ratio of light of each wavelength passing through said liquid crystal panel during a unit time.
Claim 4
Dependent Claim
66 words
The liquid crystal display of claim 2, wherein each of said light-emitting elements is a surface-emitting type of semiconductor laser, said semiconductor laser having a pair of cladding layers and an active layer, said cladding layers sandwiching said active layer, at least one of said cladding layers having a columnar shape, said columnar shape having a cross-sectional surface, said cross-sectional surface being short in one direction.
Claim 5
Dependent Claim
22 words
The liquid crystal display of claim 3, further comprising a lens and a screen to compose a projection type of display device.
Claim 6
Dependent Claim
25 words
The liquid crystal display of claim 4, wherein an image is projected onto a front surface of said screen to compose a front projection display.
Claim 7
Dependent Claim
25 words
The liquid crystal display of claim 4, wherein an image is projected onto a rear surface of said screen to compose a rear projection display.
Claim 8
Dependent Claim
66 words
The liquid crystal display of claim 1, wherein each of said light-emitting elements is a surface-emitting type of semiconductor laser, said semiconductor laser having a pair of cladding layers and an active layer, said cladding layers sandwiching said active layer, at least one of said cladding layers having a columnar shape, said columnar shape having a cross-sectional surface, said cross-sectional surface being short in one direction.
Claim 9
Dependent Claim
22 words
The liquid crystal display of claim 7, further comprising a lens and a screen to compose a projection type of display device.
Claim 10
Dependent Claim
22 words
The liquid crystal display of claim 1, further comprising a lens and a screen to compose a projection type of display device.
Claim 11
Dependent Claim
25 words
The liquid crystal display of claim 9, wherein an image is projected onto a front surface of said screen to compose a front projection display.
Claim 12
Dependent Claim
25 words
The liquid crystal display of claim 9, wherein an image is projected onto a rear surface of said screen to compose a rear projection display.
Claim 13
Dependent Claim
148 words
A liquid crystal display device comprising: a two-dimensional light-emitting element array plate formed of a plurality of light-emitting elements, said light-emitting elements being arranged in a plane array, each of said light-emitting elements having a light-projecting portion; and a liquid crystal panel having a plurality of pixels, each of said pixels corresponding to one of said light-emitting elements, each of said light-emitting elements corresponding to one of said pixels, said light-projecting portion of each of said light-emitting elements being disposed within a light-transmitting region of each of said pixels; wherein each of said light-emitting elements is a surface-emitting type of semiconductor laser, said semiconductor laser having an active layer and a pair of cladding layers, said cladding layers sandwiching said active layer, at least one of said cladding layers having a columnar shape, said columnar shape having a cross-sectional surface, said cross-sectional surface being short in one direction.
Claim 14
Dependent Claim
148 words
A liquid crystal display device comprising: a two-dimensional light-emitting element array plate formed of a plurality of light-emitting elements, said light-emitting elements being arranged in a plane array, each of said light-emitting elements having a light-projecting portion; and a liquid crystal panel having a plurality of pixels, each of said pixels corresponding to one of said light-emitting elements, each of said light-emitting elements corresponding to one of said pixels, said light-projecting portion of each of said light-emitting elements being disposed within a light-transmitting region of each of said pixels; wherein each of said light-emitting elements is a surface-emitting type of semiconductor laser, said semiconductor laser having an active layer and a pair of cladding layers, said cladding layers sandwiching said active layer, at least one of said cladding layers having a columnar shape, said columnar shape having a cross-sectional surface, said cross-sectional surface being short in one direction.
Claim 15
Dependent Claim
22 words
The liquid crystal display of claim 12, further comprising a lens and a screen to compose a projection type of display device.
References Cited (Backward Citations)
JPS6233664A
Cited
JPS6236640A
Cited
US4799050A
Cited
US5132839A
Cited
JPH01158417A
Cited
JPH04263244A
Cited
US5504597A
Cited
US5359345A
Cited
WO1994006249A1
Cited
JPH06283818A
Cited
US5666226A
Cited
JPH08211361A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-12-13 | 2003-06-14 | 2003-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-12-13 | 2007-06-14 | 2007-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-12-13 | 2011-06-14 | 2011-12-14 | $7700.00 | Window Closed / Lapsed |