US4556877A
Expired / Lapsed
US
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Digital display device having a controlling apparatus responsive to low temperatures
Assignee: Mitsubishi Motors Corp
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Filing: 1982-09-15
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Granted: 1985-12-03
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Expires: 2002-09-15
Abstract
Abstract A digital display device which has a delay circuit for operating a segment on-off driver so that when the ambient temperature at the time of renewing display is lower than a predetermined value, an OFF signal is sent to an ON segment and then, after the lapse of a predetermined time, an ON signal is sent to an OFF segment. Consequently, the overlap time between the segment to which an OFF signal was newly transmitted and the segment to which an ON signal was newly transmitted, can be made very short or eliminated whereby the discriminatability is improved to prevent misunderstanding of the display.
Inventors
- 👤 Naotake Kumagai
- 👤 Ikuo Saga
- 👤 Minoru Tatemoto
- 👤 Tetsuya Tada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:44
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/04; G09G3/16; G09G3/18
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
147 words
A digital display device comprising, a plurality of segments having means for performing a digital display, a driver for turning said segment on and off, delay apparatus, a controlling apparatus for supplying through said delay apparatus to said driver an activating signal for activating a segment which has been off and an OFF signal for turning off a segment which has been activated, temperature detecting means for detecting the ambient temperature in the environment of said segments, and said delay apparatus having means for delaying the activating signal received from said controlling apparatus during a predetermined time after the OFF signal is supplied from said controlling apparatus to said driver when ambient temperature detected by said temperature detecting means is lower than a predetermined value, whereby at each renewal of display all renewed segments are brought to a similar off state and thus are renewed substantially synchronously.
Claim 2
Dependent Claim
147 words
A digital display device comprising, a plurality of segments having means for performing a digital display, a driver for turning said segment on and off, delay apparatus, a controlling apparatus for supplying through said delay apparatus to said driver an activating signal for activating a segment which has been off and an OFF signal for turning off a segment which has been activated, temperature detecting means for detecting the ambient temperature in the environment of said segments, and said delay apparatus having means for delaying the activating signal received from said controlling apparatus during a predetermined time after the OFF signal is supplied from said controlling apparatus to said driver when ambient temperature detected by said temperature detecting means is lower than a predetermined value, whereby at each renewal of display all renewed segments are brought to a similar off state and thus are renewed substantially synchronously.
Claim 3
Dependent Claim
16 words
A digital display device according to claim 1, wherein said segments are formed of liquid crystal.
Claim 4
Dependent Claim
16 words
A digital display device according to claim 1, wherein said segments are formed of electrochromic material.
Claim 5
Dependent Claim
18 words
A digital display device according to claim 1, wherein said predetermined value of ambient temperature is 10° C.
Claim 6
Dependent Claim
23 words
A digital display device according to claim 1, wherein the time interval from one display renewal to the next display renewal is constant.
Claim 7
Dependent Claim
46 words
A digital display device according to claim 1, wherein said controlling apparatus comprises means for maintaining constant a duration time from the output of an ON signal for turning on a segment to the output of the following OFF signal for turning off the same segment.
Claim 8
Dependent Claim
40 words
A digital display device according to claim 1, wherein said controlling apparatus supplies through said delay apparatus to said driver OFF signals for turning off all the segments which have been activated till the time of renewal of digital display.
Claim 9
Dependent Claim
94 words
A digital display device according to claim 7, wherein said delay apparatus comprises means for suspending during a first predetermined time activating signals to be sent for activating segments which have been off till the time of renewal, said controlling apparatus having means for supplying through said delay apparatus OFF signals once for turning off segments which have been activated at the time of renewal and will be activated again after that, and said delay apparatus comprises means for delaying during a second predetermined time following activating signals after said OFF signals are supplied.
Claim 10
Dependent Claim
20 words
A digital display device according to claim 8, wherein said first predetermined time is shorter than said second predetermined time.
Claim 11
Dependent Claim
97 words
A digital display device according to claim 8, wherein said first and second predetermined times are set so that the brightness at the time of elapse of said second predetermined time of the segments to which ON signals are sent after the lapse of said first predetermined time, and the brightness of the segments which were ON when the renewal of display is about to be made and to which OFF signals are sent upon renewal of display and then ON signals are sent after the lapse of said second predetermined time, are equal to each other.
Claim 12
Dependent Claim
45 words
A digital display device according to claim 1, wherein said delay apparatus responds to said temperature detecting means so that when the ambient temperature in renewing display is lower than said predetermined value, said predetermined time is increased according to the lowering of the temperature.
Claim 13
Dependent Claim
36 words
A digital display device according to claim 8, wherein said delay apparatus responds to said temperature detecting means so that said first and second predetermined times are increased according to the lowering of the ambient temperature.
Claim 14
Dependent Claim
126 words
A digital display device comprising, a multiplicity of segments for performing a digital display, a driver for turning said segments on and off, delay apparatus, a controlling apparatus having means for supplying through said delay apparatus to said driver an activating signal for activating a segment which has been turned off and an OFF signal for turning off a segment which has been activated, said delay apparatus having means for delaying the activating signal received from said controlling apparatus during a predetermined time after the OFF signal is supplied from said controlling apparatus to said driver, and a manual switch for actuating said delay apparatus, whereby at each renewal display all renewed segments are brought to a similar off state and thus are renewed substantially synchronously.
Claim 15
Dependent Claim
126 words
A digital display device comprising, a multiplicity of segments for performing a digital display, a driver for turning said segments on and off, delay apparatus, a controlling apparatus having means for supplying through said delay apparatus to said driver an activating signal for activating a segment which has been turned off and an OFF signal for turning off a segment which has been activated, said delay apparatus having means for delaying the activating signal received from said controlling apparatus during a predetermined time after the OFF signal is supplied from said controlling apparatus to said driver, and a manual switch for actuating said delay apparatus, whereby at each renewal display all renewed segments are brought to a similar off state and thus are renewed substantially synchronously.
References Cited (Backward Citations)
US3973254A
Cited
US4236150A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-02 | 1989-06-03 | 1989-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-02 | 1993-06-03 | 1993-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-02 | 1997-06-03 | 1997-12-03 | $7700.00 | Window Closed / Lapsed |