US4641925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display assembly with phosphorescent backlighting
Assignee: Motorola Solutions Inc
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Filing: 1986-03-20
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Granted: 1987-02-10
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Expires: 2006-03-20
Abstract
Abstract A backlighted liquid crystal display (LCD) assembly has a thin phosphorescent layer positioned between the display and the light source to provide an even distribution of light intensity across the viewing surface of the display. The phosphorescent layer includes a phosphor powder mixed into a resin. The mixture is molded into a thin sheet and then cut to size. The phosphorescent layer and an optional disiccant layer may be encapsulated between sheets of acrylic film. The phosphorescent layer may also include a phosphorescent coating that is applied to the rear surface of the LCD or to the front surface of the light source.
Inventors
- 👤 Bernard V. Gasparaitis
- 👤 C. Patrick Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:23
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/133617; G02F1/133615
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
55 words
A display assembly, for use with a supplemental light source, said display assembly comprising in combination: a display; and thin phosphorescent layer having front and rear surfaces, said front surface positioned adjacent said display, whereby light is emitted into said display from said front surface when said rear surface is illuminated by said light source.
Claim 2
Dependent Claim
55 words
A display assembly, for use with a supplemental light source, said display assembly comprising in combination: a display; and thin phosphorescent layer having front and rear surfaces, said front surface positioned adjacent said display, whereby light is emitted into said display from said front surface when said rear surface is illuminated by said light source.
Claim 3
Dependent Claim
50 words
The display assembly of claim 1, further comprising a phosphorescent assembly having front and rear clear protective layers respectively adjacent said front and rear surfaces of said thin phosphorescent layer, wherein the bordering surfaces of said front and rear protective layers are joined together, thereby encapsulating said thin phosphorescent layer.
Claim 4
Dependent Claim
22 words
The display assembly of claim 2, further comprising a thin transparent desiccant layer located between said front and rear clear protective layers.
Claim 5
Dependent Claim
21 words
The display assembly of claim 2, wherein the joined bordering surfaces of said front and rear protective layers are flange shaped.
Claim 6
Dependent Claim
27 words
The display assembly of claim 2, further comprising a clear adhesive between said display and said front protective layer to attach said display to said phosphorescent assembly.
Claim 7
Dependent Claim
26 words
The display assembly of claim 2, further comprising a clear adhesive attached to said rear protective layer for attaching said phosphorescent assembly to said light source.
Claim 8
Dependent Claim
20 words
The display assembly of claim 1, wherein said thin phosphorescent layer includes a mixture of silicone rubber and phosphorescent material.
Claim 9
Dependent Claim
19 words
The display assembly of claim 1, wherein said thin phosphorescent layer includes a mixture of plastic and phosphorescent material.
Claim 10
Dependent Claim
15 words
The display assembly of claim 1, wherein said thin phosphorescent layer includes a phosphorescent coating.
Claim 11
Dependent Claim
82 words
A liquid crystal display assembly, comprising in combination: a liquid crystal display; a thin phosphorescent layer having front and rear surfaces, said front surface positioned adjacent said display; and a light guide adjacent said rear surface of said thin phosphorescent layer for backlighting said display, said light guide having at least one light source; whereby, light is emitted from said front surface of said thin phosphorescent layer into said display when said rear surface is illuminated by light from said light guide.
Claim 12
Dependent Claim
82 words
A liquid crystal display assembly, comprising in combination: a liquid crystal display; a thin phosphorescent layer having front and rear surfaces, said front surface positioned adjacent said display; and a light guide adjacent said rear surface of said thin phosphorescent layer for backlighting said display, said light guide having at least one light source; whereby, light is emitted from said front surface of said thin phosphorescent layer into said display when said rear surface is illuminated by light from said light guide.
Claim 13
Dependent Claim
52 words
The liquid crystal display assembly of claim 10, further comprising front and rear sheets of film respectively adjacent said front and rear surfaces of said thin phosphorescent layer, wherein the edges of said front and rear protective films are joined together, thereby encapsulating said thin phosphorescent layer and forming a phosphorescent assembly.
Claim 14
Dependent Claim
23 words
The liquid crystal display assembly of claim 11, further comprising a thin transparent desiccant layer located between said front and rear protective films.
Claim 15
Dependent Claim
22 words
The liquid crystal display assembly of claim 11, wherein the joined edges of said front and rear protective films are flange shaped.
Claim 16
Dependent Claim
29 words
The liquid crystal display assembly of claim 11, further comprising a clear adhesive between said display and said front film and between said rear film and said light guide.
Claim 17
Dependent Claim
24 words
The liquid crystal display assembly of claim 10, wherein said thin phosphorescent layer includes a molded mixture of silicone rubber and a phosphorescent powder.
Claim 18
Dependent Claim
24 words
The liquid crystal display assembly of claim 10, wherein said thin phosphorescent layer includes a molded mixture of clear thermoplastic and a phosphorescent powder.
Claim 19
Dependent Claim
17 words
The liquid crystal display assembly of claim 10, wherein said thin phosphorescent layer includes a phosphorescent coating.
Claim 20
Dependent Claim
121 words
A liquid crystal display assembly, comprising in combination: a transflective liquid crystal display; a clear front protective film positioned behind said display; a thin phosphorescent layer having front and rear surfaces, said front surface positioned behind said front film; a clear rear protective film positioned behind said thin phosphorescent layer, the edges of said front and rear films being joined so that said thin phosphorescent layer is encapsulated between said front and rear films; and a light guide positioned behind said rear protective film, said light guide having at least one light source; whereby, light is emitted from said front surface of said thin phosphorescent layer into said display when said rear surface is illuminated by light from said light guide.
Claim 21
Dependent Claim
121 words
A liquid crystal display assembly, comprising in combination: a transflective liquid crystal display; a clear front protective film positioned behind said display; a thin phosphorescent layer having front and rear surfaces, said front surface positioned behind said front film; a clear rear protective film positioned behind said thin phosphorescent layer, the edges of said front and rear films being joined so that said thin phosphorescent layer is encapsulated between said front and rear films; and a light guide positioned behind said rear protective film, said light guide having at least one light source; whereby, light is emitted from said front surface of said thin phosphorescent layer into said display when said rear surface is illuminated by light from said light guide.
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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) | 1990-02-09 | 1990-08-11 | 1991-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-09 | 1994-08-11 | 1995-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-09 | 1998-08-11 | 1999-02-10 | $7700.00 | Window Closed / Lapsed |