Patent US2229053A successfully refreshed from Google Patents.
US4945348A
Expired / Lapsed
US
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Liquid crystal display combined with signal input tablet
Assignee: Hitachi Ltd
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Filing: 1988-04-19
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Granted: 1990-07-31
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Expires: 2008-04-19
Abstract
Abstract In a liquid crystal display combined with a signal input tablet of the type which includes a light source, a liquid crystal display disposed on the light source and a transparent tablet for detecting a planar write position by a hand-writing pen which tablet is disposed on the liquid crystal display, the present invention is characterized in that a two-dimensional lens array is disposed as one-to-one erect imaging optical system between the liquid crystal display and the transparent tablet so that the display image of the liquid crystal display is projected as the same size erect image on the surface of the transparent tablet having a light diffusion operation.
Inventors
- 👤 Masahiko Ibamoto
- 👤 Satoshi Shimada
- 👤 Shinji Ohyama
- 👤 Manabu Sato
- 👤 Soshiro Kuzunuki
- 👤 Mitsunari Kano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:08
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/041; G06F3/0416; G06F3/0418; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/13338
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
110 words
In a liquid crystal display combined with a signal imput tablet comprising a tablet for detecting a planar write position by a hand-writing input pen, a liquid crystal display disposed on said table and a transparent protective plate disposed on said liquid crystal display and having a light diffusion operation, the improvement comprising a two-dimensional lens array disposed as one-to-one erect imaging optical system between said liquid crystal display and said transparent protective plate so that the display image can be projected as the same size erect image on the surface of said transparent protective plate thereby elementating parallax otherwise existing between the liquid crystal display and the input panel.
Claim 2
Dependent Claim
110 words
In a liquid crystal display combined with a signal imput tablet comprising a tablet for detecting a planar write position by a hand-writing input pen, a liquid crystal display disposed on said table and a transparent protective plate disposed on said liquid crystal display and having a light diffusion operation, the improvement comprising a two-dimensional lens array disposed as one-to-one erect imaging optical system between said liquid crystal display and said transparent protective plate so that the display image can be projected as the same size erect image on the surface of said transparent protective plate thereby elementating parallax otherwise existing between the liquid crystal display and the input panel.
Claim 3
Dependent Claim
30 words
A liquid crystal display combined with a signal input tablet according to claim 1, wherein two stages of two-dimensional microlens arrays are used as said one-to-one erect imaging optical system.
Claim 4
Dependent Claim
34 words
A liquid crystal display combined with a signal input tablet according to claim 1, wherein said two stages of microlens arrays are formed integrally on the front and reverse of said transparent protective plate.
Claim 5
Dependent Claim
50 words
A liquid crystal display combined with a signal input tablet according to claim 2, wherein one stage of said two stages of microlens arrays is formed integrally on the reverse of said transparent protective plate while the other is formed integrally on the front surface of said liquid crystal display.
Claim 6
Dependent Claim
30 words
A liquid crystal display combined with a signal input tablet according to claim 1, wherein three stages of two-dimensional microlens arrays are used as said one-to-one erect imaging optical system.
Claim 7
Dependent Claim
37 words
A liquid crystal display combined with a signal input tablet according to claim 5, wherein two stages of said three stages of two-dimensional microlens arrays are formed integrally on the front and reverse- of one transparent plate.
Claim 8
Dependent Claim
109 words
In a liquid crystal display combined with a signal imput tablet comprising a light source, a crystsl display disposed on said light source and a transparent tablet for detecting a planar write position by a hand-writing pen, disposed on said liquid crystal display, the improvement comprising a two-dimensional lens array dispoded as one-to-one erect imaging optical system between said liquid crystal display and said transparent tablet so that the display image of said liquid crystal display is projected as the same size erect image on the surface of said transparent tablet having a light diffusion operation thereby eliminating parallax otherwise existing between the liquid crystal and the input panel.
Claim 9
Dependent Claim
109 words
In a liquid crystal display combined with a signal imput tablet comprising a light source, a crystsl display disposed on said light source and a transparent tablet for detecting a planar write position by a hand-writing pen, disposed on said liquid crystal display, the improvement comprising a two-dimensional lens array dispoded as one-to-one erect imaging optical system between said liquid crystal display and said transparent tablet so that the display image of said liquid crystal display is projected as the same size erect image on the surface of said transparent tablet having a light diffusion operation thereby eliminating parallax otherwise existing between the liquid crystal and the input panel.
Claim 10
Dependent Claim
30 words
A liquid crystal display combined with a signal input tablet according to claim 7, wherein two stages of two-dimensional microlens arrays are used as said one-to-one erect imaging optical system.
Claim 11
Dependent Claim
34 words
A liquid crystal display combined with a signal input tablet according to claim 8, wherein said two stages of two-dimensional microlens arrays are formed integrally on the front and reverse of a transparent plate.
Claim 12
Dependent Claim
50 words
A liquid crystal display combined with a signal input tablet according to claim 8, wherein one stage of said two stages of two-dimensional microlens arrays is formed integrally on the reverse of said transparent tablet while the other is formed integrally on the front surface of said liquid crystal display.
Claim 13
Dependent Claim
30 words
A liquid crystal display combined with a signal input tablet according to claim 7, wherein three stages of two-dimensional microlens arrays are used as said one-to-one erect imaging optical system.
Claim 14
Dependent Claim
37 words
A liquid crystal display combined with a signal input tablet according to claim 11, wherein two stages of said three stages of two-dimensional microlens arrays are formed integrally on the front and reverse of one transparent plate.
Claim 15
Dependent Claim
29 words
A liquid crystal display combined with a signal input tablet according to claim 7, wherein a two-dimensional rod lens array is used as said one-to-one erect imaging optical system.
Claim 16
Dependent Claim
63 words
A liquid crystal display combined with a signal input tablet according to claim 11, wherein the focal length and diameter of each lens of the intermediate two-dimensional microlens array among said three stages of two-dimensional microlens arrays are smaller than those of the lenses of the other two-dimensional microlens arrays and the spacing between the individual lenses is buried by a shading mask.
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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) | 1993-07-30 | 1994-01-29 | 1994-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-30 | 1998-01-29 | 1998-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-30 | 2002-01-29 | 2002-07-31 | $7700.00 | Window Closed / Lapsed |