US3812489A - Display device for use in a desk top calculator - Google Patents

Display device for use in a desk top calculator Download PDF

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Publication number
US3812489A
US3812489A US00287846A US28784672A US3812489A US 3812489 A US3812489 A US 3812489A US 00287846 A US00287846 A US 00287846A US 28784672 A US28784672 A US 28784672A US 3812489 A US3812489 A US 3812489A
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United States
Prior art keywords
display
display device
numerical information
specified
digit
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Expired - Lifetime
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US00287846A
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English (en)
Inventor
R Hirano
M Ito
J Ishiwata
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Canon Inc
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Canon Inc
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • G06F3/1407—General aspects irrespective of display type, e.g. determination of decimal point position, display with fixed or driving decimal point, suppression of non-significant zeros
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F15/00—Digital computers in general; Data processing equipment in general
    • G06F15/02—Digital computers in general; Data processing equipment in general manually operated with input through keyboard and computation using a built-in program, e.g. pocket calculators
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • G09G3/06—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources
    • G09G3/12—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources using electroluminescent elements
    • G09G3/14—Semiconductor devices, e.g. diodes

Definitions

  • a desk top calculator includes a display device which [30] Foreign Application Priority Data displays the numerical information. This display de- Sept. 17. 1971 Japan 46-84508 vice Consumes considerable POWER In Order to minimize the power consumption by the display device, 5 CL 340 324 R, 235 92 EA, 340 33 display of the numerical information is ceased with the 51 1 1111. C1.
  • the present invention relates generally to a display device, and more particularly a device for use in a dark top calculator whose power consumption may be made minimum.
  • one of the main features of the desk top calculator is portability so that they are very often used out of doors with dry cellsor storage batteries.
  • the service life of a dry cell or storage battery is limited so that it is a very important factor in design for the desk top calculator to minimize the power consumption.
  • a substantially large portion of the power is consumed by a display device so that the most effective method for attaining the economy of power consumption is to reduce the power consumption by the display device.
  • the display device for a desk top calculator generally displays the numerical information entered by a keyboard or the result of arithmetic operation.
  • the numerical information entered or the result of arithmetic operation is kept to be displayed unless an operator depresses a clear key or a next numerical information or result of arithmetic operation is displayed.
  • the most important role of the display of the numerical information or the like is to permit the operator to read the number entered into the desk top calculator or the result of arithmetic operation, and the operator may read the displayed numerical information or the like within a very short time. Therefore, the continued display means the waste of power, and it naturally follows that the most effective method for minimizing the power consumption is to display the numerical information or'the like only when the operator desires to read it and to suppress the display when not required.
  • the primary object of the present invention is to provide a display device which may display the numerical information or the like when an operator wants to read it, thereby attaining the economy of the power.
  • a power source is disconnected from a display device after the numerical information has been entered and displayed or the result of arthmetic operation has displayed for a predetermined time.
  • this method has a fatal defect that the content held in a register is completely destroyed in some of the desk top calculators. Even when the content in the register may be held in case the power source is disconnected, the display device displays nothing so that the operator cannot see immediately whether the arithmetic operation has been completed or not or whether the numerical information he entered is held in the computer or not. Therefore the content in the register may be completely destroyed by the erratic operation by the operator.
  • a method for providing an additional display device in order to display the condition of the calculator when the numerical information or the like is not displayed
  • Another, object of the present invention is therefore to provide a novel display device which is especially adapted for use with a desk top calculator and which may not only overcome the above and other defects and problems but also attain the economy of the power.
  • Another object of the present invention is to provide a novel display device which may stop the display or ordinary numerical information a predetermined time after a key signal is applied to a control unit, thereby minimizing the power consumtpion.
  • Another object of the present invention is to provide a novel display device which may display a specified pattern representing that the numerical information entered is still held or the arithmetic operation is still con tinued as soon as the display of the numerical information or the like has been stopped.
  • Another object of the present invention is to provide a novel display device which may display a specified pattern H which means that the numerical information entered or the result of arithmetic operation is held in the calculator as soon as the display of the numerical information or the like is stopped.
  • Another object of the present invention is to provide a novel display device which may display the 'dots, that is, decimal points in the digit or digits in which the decimal points are as many as the numerical information if any were displayed and are to be displayed again as soon as the display of the numerical information has been topped so that it may be displayed for some useful purposes.
  • Another object of the present invention is to provide a novel display device which may display the pattern F representing the overflow in a display register when the overflow should occur, thereby preventing the meaningless display of overflown numerical infor- BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a block diagram of a first embodiment of a display device in accordance with the present inven-
  • FIG. 2 is a detailed circuit diagram of the first embodiment shown in FIG. 1;
  • FIG. 3 shows the waveforms of the signals used in the first embodiment
  • FIG. 4 is a view used for the explanation of the socalled 8 pattern or seven bar format used in the display device of the present invention for displaying the numerals and other patterns;
  • FIG. 5 illustrates the pattern H" displayed by the first embodiment
  • FIG. 6 is a circuit diagram of a second embodiment in accordance with the present invention.
  • FIG. 7 illustrates four points or decimal points displayed by the second embodiment
  • FIG. 8 is a circuit diagram of a third embodiment in accordance with the present invention.
  • FIG. 9 illustrates the points or decimal points dis played by the third embodiment
  • FIG. 10 is a circuit diagram of a fourth embodiment, in accordance with the'present invention.
  • FIG. 11 illustrates the pattern F displayed by the fourth embodiment.
  • reference numeral 1 denotes a keyboard with entry keys and function keys which give the numerical entry signals l(l l,,-KN and the arithmetic operation command signals KF -KF 2 denotes an arithmetic unit in which the arithmetic operations, the arithmetic operation control and the input-output control are effected and which gives the output key signal KST in response to the numerical and command signals KN and KP.
  • 3 denotes a cathode drive .unit which gives the digit signals TDTDn in order to drive the cathodes to select the digits in the dynamic display operation.
  • 4 denotes an anode driver unit which gives the output signals A,B, and G for driving the anodes to display the numerals ,or characters by the selective combinations of optelectronicelements such as photo-diodes constituting the segments of the seven bar format, the signal P being delivered to display the decimal point.
  • 5 denotes a display device comprising a plurality of display elements each consisting of seven photo-diodes constituting the segment of the seven bar format and one photo-diode constituting the decimal point.
  • 6 denotes a timer circuit for measuring a predetermined time after the key signal KST disappears.
  • a switching circuit which controls the operation of the display device 5 in response to the output signal from the timer circuit 6, the signal lNI-I inhibiting the display of the numerals and signs entered or the result of arithmetic operation and causing the display device 5 to display a specified pattern H.
  • 8 denotes a clock pulse generator for generating the clock pulses in order to synchronize the various operations in the arithmetic unit 2.
  • the cathode and anode driver untis 3 and 4, the display device 5, timer circuit 6 and the switching circuit 7 are illustrated in detail in FIG. 2.
  • Reference numeral 9 denotes a display register. 10 denotes a buffer register, and 11 denotes a decoder which not only decodes the binary coded signals into the decimal codes but also serves to select the minus sign and H pattern representing that the numerals entered or the result of arithmetic operation are held. It is seen that each of the cross-points of the row lines 0-9, and H and column lines constitutes an AND gate and gives the output signal only when the input signals are applied to all the cross-points in a row.
  • a segment converter 12 selects the segments of the seven bar format required to display a disired numeral. In response to the output signals from the decoder 11, for example, the output signal from the row line 0, the output signals appear at the cross-points, for example from the lines A,B,C,D,E and F.
  • a switching circuit connected to a time-constant cir-, cuit 13 includes a timer circuit TC.
  • Anodes 14 includes. switching transistor Tra -Trg which are turned on in response to the output signals of the segment converter 12 and a switching transistor Trp which is turned on in response to the decimal point signal P.
  • Cathodes 15 comprises switching transistors Trl-Tr8 which are turned on in response to the digit selection pulses TD -TD7 for selecting a desired digit.
  • Each of the group 'so of elements 16 comprises photo-diodes DA -D6 and Da -DG and photo-diodes DP -DP for displaying the decimal points.
  • the photodiodes DA-DG constitute the segments of the seven bar format each digit.
  • the decimal point signal is applied from the input terminal P whereas the minus-sign signal is applied at the input terrninals. 7
  • Reference numeral 17 denotes a plurality of inverters; 18, a capacitor; 19, a diode for preventing the reverse current when the capacitor 18 is discharged; 20, a resistor; 21, a switching transistor; 22 and 23, switching MOS transistors; and V AND V the terminals connected to a power source.
  • KST shows the waveform of the key signal
  • S the waveform of the signal at the point S in the timer circuit shown in FIG. 2
  • ST the waveform of the output signal of the switching transistor 21
  • MOST and MOST the waveforms of the output signals of the MOS transistors 22 and 23 respectively.
  • the seven bar format used in the present invention Y for displaying the numerals and numeric signs is shown MODE OF OPERATION
  • the desired entry and function keys on the keyboard 1 are depressed to input the desired numerical and arithmetic command information.
  • the numerical information is displayed in the display device 5 by the conventional dynamic drive system comprising the cathode and anode driving units 3 and 4. It should be noted that the numerical information is displayed only when the display signal is delivered from the switching circuit 7 in response to the output signal of the timer circuit 6 which in turns is actuated in response to the key signal KST delivered when the entry and function keys in the keyboard are depressed.
  • the special pattern H is displayed in the instant embodiment. More particularly, the numerical information is not displayed with the lapse of a predetermined interval after the last entry or function key is depressed or after the completion of arithmetic operation, and the pattern H is displayed representing that the computer is in operation.
  • the H pattern I may be displayed in any digit, but preferably in the least other words, the MOS transistor gives the signal 0.
  • the input voltage to the MOS transistor 23 becomes negative so that the latter is turned on to give the signal 1.
  • the numerical information is fed into the decoder l 1 through the display register 9 and the buffer register 10 and is converted into the signal required for displaying the same.
  • the selected AND gate in the decoder 11 is opened to deliver the converted signal into the segment converter 12 so that the segments required for displaying the numerical information may be selected.
  • the corresponding switching transistors Tra-Trg in the anodes 14 are turned on.
  • the digit pulses TD -TD- turns on the switching transistors Trl and Tr8 in the cathodes 15 in the order named and repeat the same operation.
  • the selected diodes in the selected digit 16 are turned on to display the numerical information.
  • the decimal point may be displayed when the switching transistor Trp is tumed on in response to the decimal point signal P.
  • the dynamic drive system used in the instant embodiment is of course controlled by the conventional method by a control unit (not shown).
  • the capacitor 18 starts to discharge for a predetermined time which is dependent upon the time constant of the capacitor 18 and the resistance of the resistor 20.
  • the input voltage to the switching transistor 21 becomes lower than its threshold level, the latter is turned off so that the MOS transistor 22 is turned on to give the signal l whereas the MOS transistor 23 is turned off to give the signal 0.
  • the AND gates in the de coder are closed so that all of the photo-diodes are turned off.
  • the numerical information is now not displayed. But the H gate in the decorder 11 is opened in response to the signal 1 from the MOS transistor 22 so that the H output signal is fed into the segment conveter 12.
  • the photo-diodes corresponding to the segments B,C,E,F, and G in the least significant digit are turned on when the switching transistor Trl is turned on in response to the digit pulse TDo.
  • the pattern H is displayed.
  • the key signal KST is generated upon depression of a function key and is applied to the capacitor 18 so that the switching transistor 21 is turned on again. Therefore, the photo-diodes are turned on again in the manner described above to display the numerical information again.
  • the timer circuit is used in such a manner that when the number or numerial information is not displayed, the decimal point or points are displayed in the digit or digits at whichthe number or numbers have been displayed. For example when the display of the number XXXX1234 by the display device capable of displaying eight digits disappears, the decimal points are displayed in the four digits from the right, that is XXXX
  • the second embodidment is substantially similar in construction to the first embodiment except that instead of the H in the decoder two matrix row lines DP and DP are provided.
  • the matrix row line DP is used in conjuction with the display of the numerical information whereas the row line DP in conjunction with the display of a special pattern. Only one common line may be used instead of the row lines DP, and DP but the circuitry becomes complex so that the two individual lines are used in the second embodiment.
  • the second embodiment further comprises'a zero supressor circuit 24 which may be of the conventional type so that no detailed description thereof will be made in this specification.
  • 'llie zero suppressor circuit 24 gives the output signal ZS to the decoder 11 only when the latter gives the output signal of the number to be displayed.
  • the matrix line 26 is selected in response to the output l of the MOS transistor 22 so that the output signal of the MOS transistor 22 may be delivered into t he segment converter 12 only when the output signal ZS of the zero suppressor circuit 24 is also applied to the matrix line 26.
  • the matrix line 26 is connected to the P line for displaying the decimal points in the segment converter 12, the decimal points are displayed.
  • the output signal ZS of the zero suppressor circuit 24 is delivered to the matrix line 26 so that the decimal points are displayed not in the all digits but only in the digits in which the numbers are displayed. Therefore when the display by the display device capable of displaying 8 digits was XXXX1234, the decimal points are displayed in the four digits from the right position as shown by XXX in FIG. 7 as soon as the display of the numerical information has been suspended after a predetermined time sufficient to permit an operator to read the displayed number which time is determined by the timer circuit TC.
  • FIGS. 8 AND 9 In the third -embodiment, the radix points are displayed every two digits as shown by XXXXXX.XX. in FIG. 9.
  • the third embodiment is substantially similar in con struction and operation to the second embodiment described with reference to FIG. 6 except that an AND gate and its terminal are added in the decoder 11 in order to feed the digit selection pulses TDo, TD TD.,, and TD
  • the switching transistor 21 is turned on in response to the key signal KST so that the MOS transistor 21 gives the signal 0
  • the AND gates generally indicated by 25 in FIG. 8 are all opened so that the numerical information is displayed in the same manner described above.
  • The, timer circuit TC turns off the switching transistor 21 after the numerical information has been displayed for a predetermined time so that the MOS transistors 21 and 22 give the signals l and 0 respectively, the gates 25 are closed, but the matrix line 26 is opened whenever the digit selection pulses TDo, TD TD, and TD are repetitively applied so that the decimal points are displayed every two digits. that is in the digits corresponding to the digit selection pulses TDo, TD TD, and TD as shown by XXXXX.X. in FIG. 8 when the number XXX1234' was displayed.
  • FIGS. 10 AND 11 In the fourth embodiment, when the display register 9 overflows, thedisplay of the numerical information is suspended, and the overflow pattern F is displayed as shown in FIG. 11.
  • the fourth embodiment is similar in construction to the first embodiment except that the F matrix line is added in the decoder 11 and a flipflop FF and two AND gates 27 and 28 are added.
  • the output signals are delivered from the set and reset elements S and R of the flip-flop FF.
  • no over signal is applied to the flipflop FF so that the reset signal 1 is applied to the AND gates 27 and 28.
  • both AND gates 27 and 28 are opened so that the fourth embodiment functions in the same manner described with reference to the first embodiment.
  • the overflow signal OF is generated and applied to the flipflop FF so that the latter is set to give the reset signal
  • the AND gates 27 and 28 are closed so that the display of the numerical information and the pattern H" are stopped.
  • the set output signal of the flip-flop FF is applied to the segment eonverter 12 through the F matrix line in the decoder 11 so that the segments A,E,F, and G are selected.
  • the pattern F indicating the overflow may be displayed in the most significant digit in the display device.
  • the special patterns such as H, F and the decimal points every two digit are displayed, but it is understood that the present invention is not limited to the above three special patterns, but any pattern formed by the segments of the seven bar format may be displayed.
  • no zero suppressor circuit is added, but it may be added as shown in the secondand third embodiments.
  • the foregoing description is merely an illustration of the embodiments of the present invention and is not intended to limit the present invention to these illustrative embodiments.
  • the display device for use with a desk top calculator the display of the entered numerical information or the result of the arithmetic operation is stopped after a predetermined time sufficient enough to permit an operator to read the display so that the power consumption is minimized.
  • a specified pattern such as H the display of which consumes less power than that of the full numerical information, is displayed indicating that the entered information or the result of arithmetic operation'is held so that the operator may not erroneously depress the entery or command keys.
  • the pattern H displayed in the first embodiment means HOLD so that the operator may immediately see that the calculator holds the entered numerical information or the result of arithmetic operation.
  • the decimal points are displayed only in the significant digits so that the number of digits displayed may be immediately seen and that the number of digits of the result of the next arithmetic operation such as multiplication or an operator such as a multiplier to be used may be judged.
  • the number of the decimal points displayed is reduced so that the power consumption may be further minimized.
  • the fourth embodiment displays the F pattern in the most significant digit opposed to the H pattern in the least significant digit so that the power consumption may be minimized because the overflown number will not be displayed for no purpose and that the overflow pattern F may be distinctively distinguished from the hold pattern H.
  • a display device for use in a desk top calculator including a. display means capable of displaying the numerical information and other patterns in a plurality of digits;
  • switching means comprising a plurality of switching elements through which said power supply means is connected to said display means;
  • a display device as defined in claim I further ineluding means for causing some specified switching elements of said switching means to close for displaying at least one specified pattern other than the numerical information in response to said specified signal.
  • a display device for use in a desk top calculator including i a. display means capable of displaying the numerical information and other patterns in a plurality of digits;
  • switehing means comprising a plurality of switching elements through which said power supply means is connected to said display means;
  • d. means for measuring a predetermined time after a key signal is applied and giving an output signal
  • a display device as defined in claim 3 further ineluding means for causing some specified switching elements of said switching means to close for displaying at least one specified pattern other than the numerical information in response to said output signal from said predetermined time measuring means.
  • a display device as defined in claim 4 further ineluding means for selecting at least one specified digit, whereby to display at least one specified pattern in said specified digit.
  • a display device as defined in claim 4 further ineluding means for selecting a least significant digit, whereby to display pattern H in said digit.
  • a display device as defined in claim 4 further ineluding means for selecting at least one digit in which numerical information was displayed whereby to display at least one specified pattern in said digit.
  • a display device as defined in claim 4 further including means for selecting at least one digit in which numerical information was displayed, whereby to display at least one decimal point in said digit.
  • a display device for use in a desk top calculator including a. display means capable of displaying the numerical information and other specified patterns in a plurality of digits;
  • switching means comprising a plurality of switching elements through which said power supply means is connected to said display means;
  • a display device as defined in claim 9 further inv cluding 12.
  • a display device as defined in claim 10 further including means for selecting a most significant digit, whereby to display pattern F in said digit.
  • a display device for use in a desk top calculator including a. display means capable of displaying the numerical information and other specified patterns in a plurality of digits;
  • switching means comprising a plurality of switch ing elements through which said power supply means is connected to said display means;
  • a display device as defined in claim 13 further including means for causing some specified switching elements of said switching means to close for displaying specified patterns other than the numerical information respectively in response to said output signals.
  • a display device as defined in claim 14 further including means for selecting different digits, whereby to display said patterns in said different digits respectively in response to said output signals.
US00287846A 1971-09-17 1972-09-11 Display device for use in a desk top calculator Expired - Lifetime US3812489A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3941989A (en) * 1974-12-13 1976-03-02 Mos Technology, Inc. Reducing power consumption in calculators
US3953719A (en) * 1974-11-26 1976-04-27 Texas Instruments Incorporated Latched decoder for digit outputs to an electronic digital calculator display
US3956744A (en) * 1973-01-10 1976-05-11 Canon Kabushiki Kaisha Numeral output system for circulating register
US3962571A (en) * 1974-11-26 1976-06-08 Texas Instruments Incorporated Low power digit blanking circuit
US4086473A (en) * 1976-02-10 1978-04-25 Tokyo Shibaura Electric Co., Ltd. Display device for electronic apparatus
US4099247A (en) * 1974-02-04 1978-07-04 Canon Kabushiki Kaisha Electronic instrument with non-volatile display
US4291412A (en) * 1980-06-25 1981-09-22 General Research Of Electronics, Inc. Portable radio frequency/channel display system
EP0236899A1 (de) * 1986-03-06 1987-09-16 Honeywell Regelsysteme GmbH Geschossspitze mit einem Zeitzünder
US5065357A (en) * 1985-07-22 1991-11-12 Sharp Kabushiki Kaisha Data processing machine with liquid crystal display and control means for regulating backlighting to the display
US7030838B1 (en) * 1996-12-10 2006-04-18 Minolta Co., Ltd. Image observation apparatus

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938138A (en) * 1973-06-19 1976-02-10 Sony Corporation Time switching power saver system for electronic indicators
JPS541408B2 (de) * 1973-09-11 1979-01-24
JPS5368912A (en) * 1976-12-02 1978-06-19 Casio Comput Co Ltd Initial value set system
DE2736465C2 (de) * 1977-08-12 1981-09-24 Bayerische Motoren Werke AG, 8000 München Digitale Anzeigevorrichtung für Fahrzeuge

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3956744A (en) * 1973-01-10 1976-05-11 Canon Kabushiki Kaisha Numeral output system for circulating register
US4099247A (en) * 1974-02-04 1978-07-04 Canon Kabushiki Kaisha Electronic instrument with non-volatile display
US3953719A (en) * 1974-11-26 1976-04-27 Texas Instruments Incorporated Latched decoder for digit outputs to an electronic digital calculator display
US3962571A (en) * 1974-11-26 1976-06-08 Texas Instruments Incorporated Low power digit blanking circuit
US3941989A (en) * 1974-12-13 1976-03-02 Mos Technology, Inc. Reducing power consumption in calculators
US4086473A (en) * 1976-02-10 1978-04-25 Tokyo Shibaura Electric Co., Ltd. Display device for electronic apparatus
US4291412A (en) * 1980-06-25 1981-09-22 General Research Of Electronics, Inc. Portable radio frequency/channel display system
FR2485833A1 (fr) * 1980-06-25 1981-12-31 Gen Res Electronics Inc Dispositif de commande d'affichage de frequence ou de canal pour un appareil radiophonique portatif
US5065357A (en) * 1985-07-22 1991-11-12 Sharp Kabushiki Kaisha Data processing machine with liquid crystal display and control means for regulating backlighting to the display
EP0236899A1 (de) * 1986-03-06 1987-09-16 Honeywell Regelsysteme GmbH Geschossspitze mit einem Zeitzünder
US7030838B1 (en) * 1996-12-10 2006-04-18 Minolta Co., Ltd. Image observation apparatus

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Publication number Publication date
DE2264769C3 (de) 1979-10-31
JPS4841126U (de) 1973-05-25
DE2245470A1 (de) 1973-04-12
DE2245470B2 (de) 1974-08-08
DE2264769A1 (de) 1975-01-02
DE2245470C3 (de) 1975-03-27
DE2264769B2 (de) 1979-03-08

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