US4801844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Full color hybrid TFEL display screen
Assignee: Planar Systems Inc
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Filing: 1987-11-04
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Granted: 1989-01-31
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Expires: 2007-11-04
Abstract
Abstract A hybrid full color TFEL display device includes a pair of independently addressable matrix arrays on stacked substrates wherein the front substrate includes patterned phosphors arranged as alternating stripes, and the rear substrate includes a single phosphor layer. The rear phosphor layer may be either a red or blue emitter and the front phosphor stripes are either red-green or blue-green. The space between the stacked substrates may be filled with a dyed filler material to improve the chromaticity of the rear substrate phosphor. To achieve a full color spectrum the fill factors of the various phosphors are adjusted to be inversely proportional to respective luminance of each at the driving frequency of the panels.
Inventors
- 👤 William A. Barrow
- 👤 Richard T. Tuenge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:48
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145; G; G09; G09G; G09G3/00; G09G3/20; G09G3/22; G09G3/30; H05B33/02; H05B33/04; H05B33/26; H05B33/28; G09G2300/00; G09G2300/02; G09G2300/023
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
116 words
A full color TFEL display device comprising: (a) a rear subpanel comprising an independently addressable TFEL matrix array including a solid phosphor layer emitting light of one of the primary colors; (b) a front subpanel comprising an independently addressable TFEL matrix array including phosphor stripes arranged in side-by-side alternating color sequence and each emitting one of the two primary colors not used in the rear matrix array, respectively; (c) spacer means separating said rear and front subpanels to maintain said subpanels in uniformly spaced apart stacked relationship; and (d) a filler material interposed between the front and rear subpanels having a dye for enhancing the color emitting properties of the phosphor layer of the rear subpanel.
Claim 2
Dependent Claim
116 words
A full color TFEL display device comprising: (a) a rear subpanel comprising an independently addressable TFEL matrix array including a solid phosphor layer emitting light of one of the primary colors; (b) a front subpanel comprising an independently addressable TFEL matrix array including phosphor stripes arranged in side-by-side alternating color sequence and each emitting one of the two primary colors not used in the rear matrix array, respectively; (c) spacer means separating said rear and front subpanels to maintain said subpanels in uniformly spaced apart stacked relationship; and (d) a filler material interposed between the front and rear subpanels having a dye for enhancing the color emitting properties of the phosphor layer of the rear subpanel.
Claim 3
Dependent Claim
33 words
The full color TFEL device of claim 1 wherein the phosphor layor of the rear subpanel emits blue light and the phosphor stripes of the front subpanel emit red and green light, respectively.
Claim 4
Dependent Claim
27 words
The full color TFEL device of claim 2 wherein the fill factors of the respective phosphors are inversely proportional to their luminance at a given driving frequency.
Claim 5
Dependent Claim
30 words
The full color TFEL device of claim 3 wherein the phosphor stripes on the front subpanel have differing widths, the red emitting stripes being wider than the green emitting stripes.
Claim 6
Dependent Claim
52 words
The full color TFEL device of claim 4 wherein the blue emitting phosphor layer has a fill factor of between 0.80 and 0.90, the red emitting phosphor stripes have a fill factor of between 0.46 and 0.56 and the green emitting phosphor stripes have a fill factor of between 0.21 and 0.31.
Claim 7
Dependent Claim
46 words
The full color TFEL panel of claim 5 wherein the blue emitting phosphor layer has a fill factor of approximately 0.85, the red emitting phosphor stripes have a fill factor of approximately 0.51 and the green emitting phosphor stripes have a fill factor of approximately 0.26.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |