US4040193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display device
Assignee: Panasonic Holdings Corp
•
Filing: 1976-06-09
•
Granted: 1977-08-09
•
Expires: 1996-06-09
Abstract
Abstract A display element is rotatably mounted and has a surface portion which includes a nontransparent area and a transparent area, and these two areas are different colors than each other. Such element is mounted behind a front panel having an opening facing the element. By controlling the rotational position of the display element, one of above described areas is selectively displayed. The transparent area can be positioned partly inside and partly outside the front panel, and light from a light source provided inside the front panel can be scattered through the display element.
Inventors
- 👤 Isamu Matsuda
- 👤 Taizo Ono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:03
CPC Classifications
G; G09; G09F; G09F9/00; G09F9/30; G09F9/37; G09F9/375
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
184 words
In a display device of the type having a display element with a surface including different colored areas, which display element is rotatably mounted opposite an opening of a front panel, and including means for controlling the rotational position of said display element to selectively expose a specified colored area through the opening of the front panel, the improvement comprising: the surface portion of said display element having a non-transparent area, a transparent area having a color different from the color of said non-transparent area, and a light passing portion which is positioned inside the front panel when said transparent area is exposed through the opening of the front panel, said light passing portion being optically connected to said transparent area and said non-transparent area having a size for completely covering said opening in the front panel when said non-transparent area is exposed to said opening; and a light source positioned behind said display element, whereby the light from the light source is scattered to the otuside of the front panel through the display element when the transparent area is exposed through the opening.
Claim 2
Dependent Claim
184 words
In a display device of the type having a display element with a surface including different colored areas, which display element is rotatably mounted opposite an opening of a front panel, and including means for controlling the rotational position of said display element to selectively expose a specified colored area through the opening of the front panel, the improvement comprising: the surface portion of said display element having a non-transparent area, a transparent area having a color different from the color of said non-transparent area, and a light passing portion which is positioned inside the front panel when said transparent area is exposed through the opening of the front panel, said light passing portion being optically connected to said transparent area and said non-transparent area having a size for completely covering said opening in the front panel when said non-transparent area is exposed to said opening; and a light source positioned behind said display element, whereby the light from the light source is scattered to the otuside of the front panel through the display element when the transparent area is exposed through the opening.
Claim 3
Dependent Claim
22 words
The improvement as claimed in claim 1 in which said transparent area extends around said element to form said light passing portion.
Claim 4
Dependent Claim
28 words
The improvement as claimed in claim 1 in which said display element is a hollow body having an opening in the wall thereof constituting said light passing portion.
Claim 5
Dependent Claim
38 words
The improvement as claimed in claim 1 in which said means for controlling the rotational position of said display element comprises a permanent magnet securely attached to the display element and an electromagent mounted adjacent said display element.
Claim 6
Dependent Claim
21 words
The improvement as claimed in claim 1 further comprising a light diffusing plate between said light source and said display element.
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) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |