US3886724A - Liquid crystal display watch - Google Patents

Liquid crystal display watch Download PDF

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Publication number
US3886724A
US3886724A US443185A US44318574A US3886724A US 3886724 A US3886724 A US 3886724A US 443185 A US443185 A US 443185A US 44318574 A US44318574 A US 44318574A US 3886724 A US3886724 A US 3886724A
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US
United States
Prior art keywords
output
battery
oscillator
counter
driver
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US443185A
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English (en)
Inventor
Masaaki Kamiya
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DIANI SEIKOSHA KK
Original Assignee
DIANI SEIKOSHA KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DIANI SEIKOSHA KK filed Critical DIANI SEIKOSHA KK
Application granted granted Critical
Publication of US3886724A publication Critical patent/US3886724A/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/338—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement
    • H02M3/3381—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement using a single commutation path
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G19/00—Electric power supply circuits specially adapted for use in electronic time-pieces
    • G04G19/02—Conversion or regulation of current or voltage
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G9/00—Visual time or date indication means
    • G04G9/0023—Visual time or date indication means by light valves in general
    • G04G9/0029—Details
    • G04G9/0047—Details electrical, e.g. selection or application of the operating voltage

Definitions

  • This invention relates generally to a digital watch and more particularly to a watch having a liquid crystal display.
  • the electronic timepiece circuit comprises an oscillator having a given or standard frequency output.
  • the frequency is divided by a divider.
  • the output of the divider is counted by a 60- abic or divide-by-60 counter which counts modulo 60 in series with a l2-abic or divide-by-l2 counter which counts modulo l2
  • a first driver circuit is connected to receive the output of the second-mentioned counter and a second driver receives the output of the firstmentioned counter.
  • a liquid crystal display displays the outputs of the first driver as a digital output representative of time in hours and displays the output of the second driver as a digital representation oftime in minutes.
  • a battery energizes the oscillator and the frequency divider.
  • a voltage booster is connected to the battery for boosting the output of the battery and applying it to both of the counters and both drivers. This booster is an astable blocking oscillator.
  • FIG. I is a block diagram of an embodiment of a liquid crystal display watch according to the present invention.
  • FIG. 2 is a circuit diagram of a voltage booster circuit configured as an astable blocking oscillator used in the circuit illustrated in FIG. I;
  • FIGS. 3(a) and 3(b) are schematic illustrations of a pot-type core construction used in the voltage booster circuit according to the invention.
  • FIG. 1 a block diagram of an embodiment of a liquid crystal display watch circuit according to the invention as illustrated.
  • the circuitry comprises a quartz oscillator Ill generating a standard time signal or frequency corresponding to a standard time signal.
  • a divider 12 receives the output of the oscillator and divides the output frequency thereof.
  • the output of the divider is received by a dividc-by-oO counter 13 which counts modulo 60 in series with a di ⁇ 'idc-byl 2 counter 14 which counts modulo 12.
  • the divide-by-60 counter counts minute pulses from the divider 12 and the divide-by-l2 counter 14 counts carry pulses from the dividc-by-6O counter.
  • the counters are connected respectively to drivers 15 and 16 for respectively driving a liquid crystal display watch panel 17.
  • the driver 16 will effect the display of the digital representation of the hours and the other driver 15 of the digital output of the panel corresponding to the minutes of a time display on the panel 17.
  • the display panel is provided with liquid crystals as time display elcments.
  • the battery or power source 18 is connected to apply a l.3 voltage to the crystal oscillator Ill and to the divider 12.
  • the output of the battery is boosted by a booster 19 which raises the voltage to 7 volts and applies them to both counters and drivers as illustrated in the circuit.
  • the booster circuit 19 is an astable blocking oscillator illustrated in FIG. 2 and comprises three parallel coils L L and L
  • An RC circuit comprising a resistor R in parallel with a capacitor C is connected to a first coil L of the coils and in series with the base of a transistor Q having its collector connected to the coil L and its emitter connected to the negative side of the battery and to the third coil L
  • An anode of a diode D is connected to the positive terminal of the battery through a capacitor C It is assumed that a base current flows because the base potential of the transistor Q is kept high and hence a collector current flows with terminals 1 and 2 of the coil L being positive and negative respectively.
  • negative and positive voltages are induced at terminals 3 and 4 of the coil L respectively thereby increasing the base current of the transistor with the result that there is an increase of the collector current.
  • the transistor Q is cut off as soon as the capacitor C is charged so that the polarity of the coil L reverses. That is negative and positive voltages are respectively induced at the terminals 1 and 2 thereof and at the same time also at terminals 5 and 6 of the coil L Thus a voltage summing the voltage of the battery 18 of the voltage generator across the coil L appears across the capacitor C The battery voltage of 1.35 volts is accordingly boosted to 7 volts.
  • FIGS. 3(a), 3(b) A manner of constructing the coils is illustrated in FIGS. 3(a), 3(b) in which a pot-type core 31 has the coils wound thereon in parallel and made of copper wire.
  • the coil windings are such that the terminals 3, 4 are taken from the coil L, and terminals 1, 2 from the coil L and the terminals 5, 6 from the coil L
  • a high efficiency in boosting the voltage is obtained in the liquid crystal display watch according to the present invention because the voltage of the battery 18 is added to the voltage generated at both the terminals of the coil L What I claim and desire to secure by Letters Patent ll.
  • An electronic timepiece circuit comprising, an oscillator having a given frequency output, a frequency divider dividing the output of said oscillator, a divideby-60 counter which counts modulo 6O counting output pulses of said frequency divider corresponding to minutes, a divide-by-l 2 counter which counts modulo 12 in series with the first-mentioned counter counting pulses corresponding to hours, a first driver connected to receive the output of the second-mentioned counter, a second driver connected to receive the output of the first-mentioned counter, a display panel displaying the output of said first driver as a digital output representation of time in hours, and displaying the output of the second driver as a digital output representation of time in minutes, a battery energizing said oscillator and said frequency divider, and a voltage booster comprising an astable blocking oscillator connected to said battery for boosting the output of said battery and applying it to both of said counters and both of said drivers.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
US443185A 1973-02-23 1974-02-19 Liquid crystal display watch Expired - Lifetime US3886724A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1973023354U JPS49126068U (enrdf_load_stackoverflow) 1973-02-23 1973-02-23

Publications (1)

Publication Number Publication Date
US3886724A true US3886724A (en) 1975-06-03

Family

ID=12108227

Family Applications (1)

Application Number Title Priority Date Filing Date
US443185A Expired - Lifetime US3886724A (en) 1973-02-23 1974-02-19 Liquid crystal display watch

Country Status (3)

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US (1) US3886724A (enrdf_load_stackoverflow)
JP (1) JPS49126068U (enrdf_load_stackoverflow)
GB (1) GB1429737A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991416A (en) * 1975-09-18 1976-11-09 Hughes Aircraft Company AC biased and resonated liquid crystal display
US3999368A (en) * 1974-12-11 1976-12-28 Citizen Watch Co., Ltd. Circuit for an electronic timepiece
US4123671A (en) * 1976-04-21 1978-10-31 Tokyo Shibaura Electric Co., Ltd. Integrated driver circuit for display device
US4184318A (en) * 1977-11-22 1980-01-22 Copal Company Limited Time indicating device for electronic digital type car clocks
US4442870A (en) * 1980-11-07 1984-04-17 Sulzer Brothers Limited Brake for a gripper projectile of a weaving machine
US20050146109A1 (en) * 2002-03-01 2005-07-07 Textron Inc. Golf car suspension

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3715881A (en) * 1970-05-11 1973-02-13 Mfg Des Montres Rolex Sa Bienn Display control device for timepieces
US3750383A (en) * 1970-12-29 1973-08-07 Suwa Seikosha Kk Quartz-oscillator controlled timepiece using liquid crystal display device
US3797225A (en) * 1971-02-27 1974-03-19 Suwa Seikosha Kk Driving arrangement for passive time indication devices

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3668860A (en) * 1970-11-05 1972-06-13 Timex Corp High voltage watch power supply

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3715881A (en) * 1970-05-11 1973-02-13 Mfg Des Montres Rolex Sa Bienn Display control device for timepieces
US3750383A (en) * 1970-12-29 1973-08-07 Suwa Seikosha Kk Quartz-oscillator controlled timepiece using liquid crystal display device
US3797225A (en) * 1971-02-27 1974-03-19 Suwa Seikosha Kk Driving arrangement for passive time indication devices

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3999368A (en) * 1974-12-11 1976-12-28 Citizen Watch Co., Ltd. Circuit for an electronic timepiece
US3991416A (en) * 1975-09-18 1976-11-09 Hughes Aircraft Company AC biased and resonated liquid crystal display
US4123671A (en) * 1976-04-21 1978-10-31 Tokyo Shibaura Electric Co., Ltd. Integrated driver circuit for display device
US4184318A (en) * 1977-11-22 1980-01-22 Copal Company Limited Time indicating device for electronic digital type car clocks
US4442870A (en) * 1980-11-07 1984-04-17 Sulzer Brothers Limited Brake for a gripper projectile of a weaving machine
US20050146109A1 (en) * 2002-03-01 2005-07-07 Textron Inc. Golf car suspension

Also Published As

Publication number Publication date
JPS49126068U (enrdf_load_stackoverflow) 1974-10-29
GB1429737A (en) 1976-03-24

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