Numerical display system

Claim 2

A numerical display system, comprising a plurality of numerical indicators for effecting plural-digit numerical display, means for producing a shift pulse train, a register the number of digit portions of which is equal to that of said numerical indicators and in which numerical contents to be displayed are stored in said digit portions and digit sequentially taken out therefrom by way of right shift by means of said shift pulse train, indicator selecting means for sequentially selecting said plurality of numerical indicators in synchronism with the right shift of said register, numeral selecting means for selecting the successive digits to be displayed by the successively selected ones of said numerical indicators in accordance with the successive numerical contents taken out from said register, and invalid zero indication preventing means coupled to said register and controlling the display of zeros by said numerical indicators for preventing the display of an invalid zero or zeros, said invalid zero indication preventing means including means for memorizing the digit position or digit positions corresponding to the digit portion or portions of stored invalid zero content or contents of said register and means for preventing activation of said numerical indicators when said stored invalid zero content or contents are taken out from said register, thereby producing a plural-digit numerical display without indicating said invalid zero or zeros.

Claim 3

A numerical display system, comprising a plurality of numerical indicators for effecting plural-digit numerical display and each having respective terminals controlling display of respective numerals, shift pulse-producing means for producing a shift pulse train, a register the number of digit portions of which is equal to that of said numerical indicators and in which numerical contents to be displayed are stored in said digit portions and digit sequentially taken out therefrom by way of right shift under the control of said shift pulse train, said shift pulse-producing means being operable to successively actuate said register to successively shift out the contents thereof to a register output, indicator selecting means for sequentially selecting said plurality of numerical indicators from that representing the least significant digit position to that representing the most significant digit position in synchronism with the right shift of said register, numeral selecting means coupled to said register output and to said numerical indicators for selecting those terminals of said plurality of numerical indicators which control the display of an identical numeral in accordance with the numerical contents sequentially taken out from said register, and invalid zero indication preventing means coupled to the register output and to said indicator selecting means for preventing the display of an invalid zero or zeros, said invalid zero indication preventing means including means for memorizing the digit position or digit positions corresponding to the digit portion or portions of stored invalid zero content or zero contents of said register during a first actuation of said register to shift out the contents thereof and means for preventing selection of the plurality of numerical indicators by said indicator selecting means when said stored invalid zero content or contents are taken out from said register during subsequent actuations of said register by said shift pulse-producing means thereby producing a plural-digit numerical display without indicating said invalid zero or zeros.

Claim 4

A numerical display system, comprising a plurality of numerical indicators for effecting plural-digit numerical display and each having respective terminals controlling display of respective numerals, shift pulse-producing means for producing a shift pulse train, a register the number of digit portions of which is equal to that of said numerical indicators and in which numerical contents to be displayed are stored in said digit portions and digit sequentially taken out therefrom by way of right shift under the control of said shift pulse train, said shift pulse-producing means being operable to successively actuate said register to successively shift out the contents thereof to a register output, indicator selecting means for sequentially selecting said plurality of numerical indicators from that representing the least significant digit position to that representing the most significant digit position in synchronism with the right shift of said register, numeral selecting means coupled to said register output and to said numerical indicators for selecting those terminals of said plurality of numerical indicators which control the display of an identical numeral in accordance with the numerical contents sequentially taken out from said register, and invalid zero indication preventing means coupled to the register output and to said indicator selecting means for preventing the display of an invalid zero or zeros, said invalid zero indication preventing means including means for memorizing the digit position or digit positions corresponding to the digit portion or portions of stored invalid zero content or zero contents of said register during a first actuation of said register to shift out the contents thereof and means for preventing selection of the plurality of numerical indicators by said indicator selecting means when said stored invalid zero content or contents are taken out from said register during subsequent actuations of said register by said shift pulse-producing means thereby producing a plural-digit numerical display without indicating said invalid zero or zeros.

Claim 5

A numerical display system, comprising a plurality of numerical indicators for effecting plural-digit numerical display and each having respective numeral selection terminals for controlling display of respective numerals and a decimal point indicating terminal controlling display of a decimal point, shift pulse-producing means for producing a shift pulse train, a register the number of digit portions of which is equal to that of said numerical indicators and in which numerical contents to be displayed are stored in said digit portions and digit sequentially taken out therefrom by way of right shift under the control of said shift pulse train, said shift pulse-producing means being operable to successively actuate said register to successively shift out the contents thereof to a register output, a decimal-point counter driven in synchronism with the right shift of said register, indicator selecting means for sequentially selecting said plurality of numerical indicators from that representing the least significant digit position to that representing the most significant digit position in synchronism with the right shift of said register, numeral selected means for selecting those numeral selection terminals of said plurality of numerical indicators which control the display of an identical numeral in accordance with the numerical contents sequentially taken out from said register, decimal point drive means adapted to drive the decimal point indicating terminal of a selected one of said plurality of numerical indicators when the output contents of said decimal-point counter becomes a predetermined value, and invalid zero indication preventing means coupled to the register output and to said indicator selecting means for preventing the display of an invalid zero or zeros, said invalid zero indication preventing means including means for memorizing the digit position or digit positions corresponding to the digit portion or portions of stored invalid zero content or contents of said register during a first actuation of said register to shift out the contents thereof and means for preventing selection of the plurality of numerical indicators by said indicator selecting means when said stored invalid zero content or contents are taken out from said register during subsequent actuations of said register by said shift pulse producing means, thereby producing a plural-digit numerical display without said invalid zero or zeros but with the decimal point.

Claim 6

A numerical display system, comprising a plurality of numerical indicators for effecting plural-digit numerical display and each having respective numeral selection terminals for controlling display of respective numerals and a decimal point indicating terminal controlling display of a decimal point, shift pulse-producing means for producing a shift pulse train, a register the number of digit portions of which is equal to that of said numerical indicators and in which numerical contents to be displayed are stored in said digit portions and digit sequentially taken out therefrom by way of right shift under the control of said shift pulse train, said shift pulse-producing means being operable to successively actuate said register to successively shift out the contents thereof to a register output, a decimal-point counter driven in synchronism with the right shift of said register, indicator selecting means for sequentially selecting said plurality of numerical indicators from that representing the least significant digit position to that representing the most significant digit position in synchronism with the right shift of said register, numeral selected means for selecting those numeral selection terminals of said plurality of numerical indicators which control the display of an identical numeral in accordance with the numerical contents sequentially taken out from said register, decimal point drive means adapted to drive the decimal point indicating terminal of a selected one of said plurality of numerical indicators when the output contents of said decimal-point counter becomes a predetermined value, and invalid zero indication preventing means coupled to the register output and to said indicator selecting means for preventing the display of an invalid zero or zeros, said invalid zero indication preventing means including means for memorizing the digit position or digit positions corresponding to the digit portion or portions of stored invalid zero content or contents of said register during a first actuation of said register to shift out the contents thereof and means for preventing selection of the plurality of numerical indicators by said indicator selecting means when said stored invalid zero content or contents are taken out from said register during subsequent actuations of said register by said shift pulse producing means, thereby producing a plural-digit numerical display without said invalid zero or zeros but with the decimal point.

Claim 7

A numerical display system as set forth in claim 1, wherein: said plurality of numerical indicators are 1st, 2nd, nth numerical indicators each having respective numeral selection terminals for indicating the numerals 0, 1, 2, ...., 9 and a common terminal common to said numeral selection terminals; said indicator selecting means includes a counter which operates in synchronism with the right shift of said register, 1st, 2nd, ...., nth decoders for decoding the contents 1, 2 ...., n of said counter respectively, 1st, snd, ...., nth AND circuits to which are supplied the outputs of said 1st, 2nd ...., nth decoders respectively, and 1st, 2nd, ...., nth switching circuits adapted to drive the common terminals of said 1st, 2nd, ...., nth numerical indicators under the control of the outputs said 1st, 1nd, ...., nth and circuits respectively; said numeral selecting means includes 0, 1, 2, ...., 9 numeral decoders for decoding the output contents 0, 1, 2, ...., 9 of said register respectively, and 0, 1, 2, ...., 9 switching circuits for driving those numeral selection terminals of said 1st, 2nd, ...., nth numerical indicators which indicate the identical numerals 0, 1, 2, ...., 9 under the control of the outputs of said 0, 1, 2, .... 9 numeral decoders respecitvely; said invalid zero indication preventing means are supplied with the output of the 0 decoder of said numeral selecting means and the outputs of said 1st and nth decoders of said indicator selecting means to produce an output for preventing indication of invalid zero or zeros, and said invalid zero indication preventing output is supplied to the 1st, 2nd, ...., nth AND circuits of said indicator selecting means.

Claim 8

A numerical display system as set forth in claim 3, wherein: said plurality of numeral indicators are 1st, 2nd, ...., nth numerical indicators each having numeral selection terminals for indicating the numerals 0, 1, 2, ...., 9, a decimal point indicating terminal for indicating the decimal point and a common terminal common to said numeral selection and decimal point indicating terminals; said numerical indicator selecting means includes a counter which operates in synchronism with the right shift of said register, 1st, 2nd, ...., nth decoders for decoding the contents 1, 2, ...., n of said counter respectively, 1st, 2nd, ...., nth AND circuits to which are supplied the outputs of said 1st, 2nd, ...., nth decoders respectively, and 1st, 2nd, ...., nth switching circuits adapted to drive the common terminals of said 1st, 2nd, ...., nth numerical indicators under the control of the outputs of said 1st, 2nd, ...., nth AND circuits respectively; said numeral selecting means includes 0, 1, 2 ...., 9 numeral decoders for decoding the output contents 0, 1, 2, ...., 9 of said register respectively, and 0, 1, 2 ...., 9 switching circuits for driving those numeral selection terminals of said 1st, 2nd, ...., nth numerical indicators which indicate the identical numerals 0, 1, 2 ...., 9 under the control of the outputs of said , 1, 2, ...., 9 numeral decoders respectively; said decimal point driving means includes a decimal point decoder for decoding a predetermined one of the output contents of said decimal point counter, and a switching circuit for driving the decimal point indicating terminal of one of said 1st, 2nd, ...., nth numerical indicators under the control of the output of said decimal point decoder; said invalid zero-indication preventing means are supplied with the output of the 0 decoder of said numeral selecting means and the output of said nth decoder of said indicator selecting means to produce an output for preventing indication of invalid zero or zeros, and said invalid zero indication preventing output is supplied to the 1st, 2nd, ...., nth AND circuits of said indicator selecting means.