US5089810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stacked display panel construction and method of making same
Assignee: Computer Accessories Corp
•
Filing: 1990-04-09
•
Granted: 1992-02-18
•
Expires: 2010-04-09
Abstract
Abstract A new display panel system includes a stacked display panel and drive units therefor. The drive units include a computer for adjusting for the individual gamma characterics of each one of the display panels for color balancing purposes and for causing the luminance of each panel to be maximized, or at least greatly increased for each intensity level or shading of each color.
Inventors
- 👤 Leonid Shapiro
- 👤 William K. Bohannon
- 👤 Randall Farwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:15
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1347; G02F1/13471; G02F1/13473; G02F1/1335; G02F1/133528; G02F1/133533; G02F1/133531; G02F1/137; G02F1/139; G02F1/1396; G02F1/1397; G09; G09G; G09G2300/00; G09G2300/02; G09G2300/023; G09G2320/00; G09G2320/02; G09G2320/0247; G09G2320/0271; G09G2320/0276
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
179 words
A display system comprising: a plurality of liquid crystal display panels, each one of said panels having a plurality of electrically operable pixel elements for displaying color images; each liquid crystal panel being interposed between a pair of polarizers that cooperate with said panel for passing a portion of the visible light spectrum to form said color image; each one of said panels exhibiting substantially different relative luminance levels as a function of an applied direct current reference voltage level; direct current voltage level control means for biasing each one of said panels with a direct current reference voltage level to maximize substantially the luminance of said pixels when fully energized; said electrically operable pixels being electrically energized independently of said direct current voltage control means; contrast adjustment means for balancing color contrast between each of said panels; and said contrast adjustment means causing the direct current reference voltage level for each one of said panels to be adjusted by substantially different offset direct current voltage values to substantially optimize the color contrast between each one of said panels.
Claim 2
Dependent Claim
179 words
A display system comprising: a plurality of liquid crystal display panels, each one of said panels having a plurality of electrically operable pixel elements for displaying color images; each liquid crystal panel being interposed between a pair of polarizers that cooperate with said panel for passing a portion of the visible light spectrum to form said color image; each one of said panels exhibiting substantially different relative luminance levels as a function of an applied direct current reference voltage level; direct current voltage level control means for biasing each one of said panels with a direct current reference voltage level to maximize substantially the luminance of said pixels when fully energized; said electrically operable pixels being electrically energized independently of said direct current voltage control means; contrast adjustment means for balancing color contrast between each of said panels; and said contrast adjustment means causing the direct current reference voltage level for each one of said panels to be adjusted by substantially different offset direct current voltage values to substantially optimize the color contrast between each one of said panels.
Claim 3
Dependent Claim
70 words
A display system according to claim 1, wherein said contrast adjustment means includes: digital to analog converter means for generating analog signals indicative of the direct current voltages to be applied to each one of said panels to substantially optimize the color contrast between said panels; and a differential amplifier responsive to said analog signals for generating said direct current voltages for each one of said liquid crystal display panels.
Claim 4
Dependent Claim
23 words
A display system according to claim 1, wherein each one of said liquid crystal display panels is a nematic liquid crystal display panel.
Claim 5
Dependent Claim
22 words
A display system according to claim 3, wherein said nematic liquid crystal display panel is a twisted nematic liquid crystal display panel.
Claim 6
Dependent Claim
23 words
A display system according to claim 3, wherein said nematic liquid crystal display panel is a highly twisted nematic liquid crystal display panel.
Claim 7
Dependent Claim
22 words
A display system according to claim 3, wherein said nematic liquid crystal display panel is a supertwisted nematic liquid crystal display panel.
Claim 8
Dependent Claim
19 words
A display system according to claim 1, wherein said display panel construction includes three monochromatic liquid crystal display panels.
Claim 9
Dependent Claim
41 words
A display system according to claim 7, wherein one of said monochromatic liquid crystal display panels in cooperation with its associated polarizers passes non-colored light and colored light, said colored light being substantially in the yellow color spectrum of visible light.
Claim 10
Dependent Claim
42 words
A display system according to claim 8, wherein another one of said monochromatic liquid crystal display panels in cooperation with its associated polarizers passes non-colored light and colored light, said colored light being substantially in the magenta color spectrum of visible light.
Claim 11
Dependent Claim
42 words
A display system according to claim 9, wherein another one of said monochromatic liquid crystal display panels in cooperation with its associated polarizers passes non-colored light and colored light, said colored light being substantially in the cyan color spectrum of visible light.
Claim 12
Dependent Claim
38 words
A display system according to claim 7, wherein one of said monochromatic liquid crystal display panels in cooperation with its associated polarizers passes colored light, said colored light being substantially in the red color spectrum of visible light.
Claim 13
Dependent Claim
39 words
A display system according to claim 11, wherein another one of said monochromatic liquid crystal display panels in cooperation with its associated polarizers passes colored light, said colored light being substantially in the green color spectrum of visible light.
Claim 14
Dependent Claim
33 words
A display system according to claim 12, wherein another one of said monochromatic liquid crystal display panels passes colored light, said colored light being substantially in the blue color spectrum of visible light.
Claim 15
Dependent Claim
20 words
A display system according to claim 1, wherein said liquid crystal panel is an active matrix liquid crystal display panel.
Claim 16
Dependent Claim
22 words
A display system according to claim 1, wherein said display panel construction includes a set of active matrix liquid crystal display panels.
Claim 17
Dependent Claim
44 words
A display system according to claim 1, wherein said direct current voltage level control means is manually adjustable between a substantially maximum amount of relative luminance when said panel is energized and a substantially minimum amount of relative luminance when said panel is de-energized.
Claim 18
Dependent Claim
35 words
A display system according to claim 16, wherein said liquid crystal display panel has two controllable modes of operation in response to said video means, at least one of said modes being a non-white mode.
Claim 19
Dependent Claim
33 words
A display system according to claim 1, further including processor means for generating a plurality of displayable test pattern images, each one of said displayable test pattern images having different shades of color.
Claim 20
Independent Claim
163 words
A method for displaying color images comprising; using a plurality of liquid crystal display panels, each one of said panels having a plurality of electrically operable pixel elements for displaying color images; interposing each one of said panels between a pair of polarizers that cooperate with said panel for passing a portion of the visible light spectrum to form said color images; using direct current voltage level control means for biasing each of said panels with a direct current reference voltage; biasing each of said panels with a direct current reference voltage level to maximize substantially the luminance of pixels when fully energized; energizing selectively said pixel elements independently of said direct current voltage level control means; balancing color contrast between each one of said panels by causing the direct current reference voltage level for each one of said panels to be adjusted by substantially different offset direct current voltage values to substantially optimize the color contrast between each one of said panels.
Claim 21
Independent Claim
163 words
A method for displaying color images comprising; using a plurality of liquid crystal display panels, each one of said panels having a plurality of electrically operable pixel elements for displaying color images; interposing each one of said panels between a pair of polarizers that cooperate with said panel for passing a portion of the visible light spectrum to form said color images; using direct current voltage level control means for biasing each of said panels with a direct current reference voltage; biasing each of said panels with a direct current reference voltage level to maximize substantially the luminance of pixels when fully energized; energizing selectively said pixel elements independently of said direct current voltage level control means; balancing color contrast between each one of said panels by causing the direct current reference voltage level for each one of said panels to be adjusted by substantially different offset direct current voltage values to substantially optimize the color contrast between each one of said panels.
References Cited (Backward Citations)
US3703329A
Cited
US3785721A
Cited
US3811751A
Cited
US3863246A
Cited
US4232948A
Cited
JPS50110296A
Cited
US4068926A
Cited
US4171874A
Cited
US4097128A
Cited
US4006968A
Cited
US4044546A
Cited
US4127322A
Cited
US4411496A
Cited
US4241339A
Cited
US4097130A
Cited
US4257682A
Cited
US4251137A
Cited
JPS55159415A
Cited
US4394069A
Cited
US4299447A
Cited
US4349817A
Cited
JPS56121076A
Cited
US4487481A
Cited
US4659183A
Cited
JPS56140320A
Cited
US4547043A
Cited
US4366440A
Cited
US4416514A
Cited
US4443065A
Cited
JPS58224376A
Cited
US4608558A
Cited
US4597636A
Cited
JPS59189317A
Cited
JPS59219719A
Cited
US4634229A
Cited
US4697884B1
Cited
US4697884A
Cited
US4651148A
Cited
US4758818A
Cited
US4652101A
Cited
US4613207A
Cited
US4745406A
Cited
JPS61100725A
Cited
US4812034A
Cited
US4671634A
Cited
US4734692A
Cited
US4723840A
Cited
US4722593A
Cited
US4759612A
Cited
US4663667A
Cited
JPS62125328A
Cited
JPS62164024A
Cited
US4813770A
Cited
US4770525A
Cited
US4850681A
Cited
US4770500A
Cited
US4756604A
Cited
US4796978A
Cited
US4832461A
Cited
JPS6349736A
Cited
US4726663A
Cited
JPS63144326A
Cited
US4838655A
Cited
JPS63195624A
Cited
JPS63234225A
Cited
JPS63264731A
Cited
JPS6444417A
Cited
US4921334A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-17 | 1995-08-19 | 1996-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-17 | 1999-08-19 | 2000-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-17 | 2003-08-19 | 2004-02-18 | $7700.00 | Window Closed / Lapsed |