Classifications

• • G—PHYSICS
  • G05—CONTROLLING; REGULATING
  • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
  • G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
  • G05F3/02—Regulating voltage or current
  • G05F3/08—Regulating voltage or current wherein the variable is DC
  • G05F3/10—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics
  • G05F3/16—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics being semiconductor devices
  • G05F3/20—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
  • G05F3/26—Current mirrors
• • G—PHYSICS
  • G05—CONTROLLING; REGULATING
  • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
  • G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
  • G05F3/02—Regulating voltage or current
  • G05F3/08—Regulating voltage or current wherein the variable is DC
  • G05F3/10—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics
  • G05F3/16—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics being semiconductor devices
  • G05F3/20—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
  • G05F3/26—Current mirrors
  • G05F3/262—Current mirrors using field-effect transistors only
• • 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
  • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
  • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
  • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
  • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
  • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
  • G09G3/3275—Details of drivers for data electrodes
  • G09G3/3283—Details of drivers for data electrodes in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements
• • 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
  • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
  • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
  • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
  • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
• • 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
  • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
  • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
  • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
  • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
  • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
  • G09G3/3216—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using a passive matrix

Definitions

• the present invention is applied to drive a display device in which current driving elements such as organic electroluminescent elements (hereinafter referred to as organic EL elements) and light emitting diodes (hereinafter referred to as LEDs) are arranged in a matrix. And a constant current drive device.
• current driving elements such as organic electroluminescent elements (hereinafter referred to as organic EL elements) and light emitting diodes (hereinafter referred to as LEDs) are arranged in a matrix.
• LEDs light emitting diodes
• line sequential driving is performed to drive a display device in which current driving elements 1 are arranged in a matrix.
• current sources 2a, 2b and 2c are generally used as drive sources for the current drive element 1.
• connection switches 3 a, 3 b and 3 c are sequentially connected by connection switches 3 a, 3 b and 3 c to display an image. It is sufficient to select and flow current according to the brightness of the image in each vertical line. In this case, since it is line sequential, the current of each vertical line needs to flow simultaneously in synchronization with the horizontal lines.
• the current sources 2a, 2b and 2c are respectively set as constant currents, and a pulse width modulation signal (P WM (P u 1 se W idth) according to the brightness of the image. M odulation)) Turn on / off connection switch 4 a, 4 b, 4 c. That is, according to the brightness of the image, the horizontal lines of the connection switches 4a, 4b and 4c are connected within the time selected by the connection switches 3a, 3b and 3c. Just do it. If you want to make it brighter, increase the on-time, and if you want darker, shorten the on-time.
• P WM P u 1 se W idth
• reference numeral 5 denotes an operational amplifier circuit constituting a constant current generation unit, and the non-inverted input terminal + of this operational amplifier circuit 5 is used to determine the value of constant current I Reference voltage V Ground via a battery 6 to obtain ref, and ground the inverting input terminal 1 of this operational amplifier circuit 5 via a resistor 7.
• the gate of the field effect transistor 9 of this circuit is formed on the other side of the circuit of the memory circuit.
• connection switch 4 a Connect the source of the field effect transistor 1 1 connected to the gate 1 to the power supply terminal 10 and connect the drain of this field effect transistor 1 1 to the connection switch 4 a, for example.
• R is the resistance of resistor 7 o.
• This constant current I also flows through the field effect transistor 1 1 of the mirror side which constitutes the current effect transistor 9 and the current mirror circuit.
• I is supplied via the connection switch 4 a to the current drive element 1 that constitutes the display.
• the constant current circuit as shown in FIG. 5 When the constant current circuit as shown in FIG. 5 is used as the current sources 2a, 2b and 2c of the display as shown in FIG. 4, the constant current circuit as shown in FIG. 5 is used. For example, as many as 500 pieces are needed, the circuit scale is increased and the power consumption is increased.
• a constant current driver has been proposed.
• the parts corresponding to those in FIG. 5 will be assigned the same reference numerals as in FIG.
• the non-inverting input terminal + of the operational amplification circuit 5 constituting the constant current generation unit is grounded via the battery 6 to obtain the reference voltage V ref to determine the value of the constant current I.
• the number of output terminals of this operation width circuit 5 corresponds to the number of full-lent mirror circuits, for example 500 in FIG. 6, and in FIG. 6, three n-type field effect transistors 8a, 8b, The sources of the field effect transistors 8a, 8b and 8c are connected to one of the inverting input terminals of the operational amplifier circuit 5, respectively.
• diode-connected p-type field effect transistors 9a, 9a which respectively form the reference side of the force-lens mirror circuit, are connected to the drains of the field-effect transistors 8a 8b and 8c, respectively.
• 9 b
• each source of transistor 9 a, 9 b and 9 c Connect to the connection point of each gate and drain of 9 Connect each source of transistor 9 a, 9 b and 9 c to the power supply terminal 10 to which positive DC voltage is supplied.
• the respective gates of the field effect transistor 9a, 9b and 9c constitute the mirror side of the current mirror circuit!
• the field effect transistor 1 1 a, lib and 11 c are respectively connected to the respective gates, and the sources of the field effect transistor 1 1 a, l 1 b and 1 1 c are connected to a power supply terminal.
• the drains of the field effect transistors 1 1 a, 1 1 b and 1 1 c are connected to 10, for example, to connection switches 4 a, 4 b and 4 c, respectively.
• the constant current I is supplied from the field effect transistors 9a, 9b and 9c, respectively, and the field effect transistors 9a, 9b and
• the constant current I flows through the transistors 1 1 a, lib and 1 1 c, and this constant current I is, for example, a connection switch. It is supplied to the current drive element 1 which composes the display device through the channels 4a, 4b and 4c.
• Patent Document 1 As a constant current drive device of a display device in which current drive elements are arranged in a matrix, one disclosed in Patent Document 1 is also proposed.
• Patent Document 1 Japanese Patent Application Laid-Open Publication No. 11-183850 Disclosure of the Invention
• the constant current drive device comprises a plurality of force lenticular mirror circuits comprising a reference transistor and a mirror transistor, and respective mirror transistors of the plurality of force lenticular circuits.
• the current of mirror side transistor is fixed so that the current of mirror side transistor becomes constant according to the first switching means to connect with the transistor on the rear side and the cycle of selection of multiple current mirror circuits.
• the reference voltage switching means for switching the reference voltage of the current generator and the constant current generator match the cycle of this selection. And second switching means connected to the reference side transistor of the path.
• the reference voltage of the constant current generator is switched so that the current on the mirror side becomes constant in accordance with the selection cycle of a plurality of current mirror circuits. Therefore, for example, even if there are variations in the characteristics of the field effect transistor used, it is possible to eliminate the variation in the value of constant current I.
• the current mirror has a constant current only on the mirror side due to the current holding capacity, except for the selected current mirror circuit among the plurality of force lent mirror circuits. Power consumption is improved by almost half.
• FIG. 1 is a block diagram showing an example of the best mode for carrying out the constant current drive device of the present invention.
• FIG. 2 is a configuration diagram for explaining FIG.
• FIG. 3 is a diagram for explaining FIG. 1;
• FIG. 4 is a configuration diagram showing an example of a display device in which current drive elements are arranged in a matrix.
• FIG. 5 is a block diagram showing an example of a constant current circuit.
• FIG. 6 is a block diagram showing an example of a constant current drive device. BEST MODE FOR CARRYING OUT THE INVENTION
• the inverting input terminal 1 of the arithmetic wide band circuit 5 constituting the constant current generating unit is grounded via the resistor 7.
• the output terminal of the operational amplification circuit 5 is connected to the gate of the n-type field effect transistor 8, and the source of the field effect transistor 8 is connected to the inverting input terminal 1 of the operational width circuit 5.
• p-type field effect transistors 20 a, 20 b and 20 c respectively forming the connection of the drain of field effect transistor 8 constituting the constant current generating portion
• the source of each of the field effect transistors 2 0 a, 2 0 b and 2 0 c that make up this connection switch is connected to the drain of the 2nd channel, and each source is used to form the reference side of the current mirror circuit P
• Power source connected to the respective drains of the field effect transistors 9a, 9b and 9c, and the sources of the field effect transistors 9a, 9b and 9c are supplied with positive DC voltage. Connect to terminal 10.
• P-type field effect transistors constituting the mirror side of the force-lent mirror circuit of the field effect transistor 9a, 9b and the husband A of 9c are respectively formed by the P type field effect transistor 1 1 a, 1 1 b and Each field effect transistor 1 1 a, 1 1 and 1 1 c is connected to a power supply terminal 10, and each field effect transistor 1 is connected to each gate of 1 1 c.
• connection switches 4 a, 4 b and 4 c respectively.
• the current holding capacitors 21a, 21b and 21c for holding the gate voltage for holding the current of the field-effect transistors lla, lib and 11c on the mirror side respectively. Connect to power supply terminal 1 0.
• the drains of the field effect transistors 9a, 9b and 9c are connected to form a switch, respectively.
• the field effect transistor of the shape is connected to each drain of the transistors 2 2 a, 2 2 b and 2 2 c, and this field effect transistor 2 2 a, 2 2 b and 2 2 c respectively.
• the source of each is connected to each of the field effect transistors 9a, 9b and 9c, respectively.
• reference numeral 23 denotes a calendar mirror circuit selection which sequentially selects a power limiter mirror circuit configured by a microcomputer and the like, and sequentially reads out a reference voltage set in advance.
• the reference voltage readout circuit, and the clock signal as shown in FIG. 3A generated by the current mirror circuit selection and reference voltage readout circuit 2 3 is shown as a shift resister.
• the selected pulses are sequentially supplied to the shift registers 24a, 2d as shown in Figs. 3B, 3C, and 3D in synchronization with this clock signal.
• This shift register 24a is connected to each gate of the i field effect transistor 20a and 22a which form a connection switch. A selection pulse is applied to this shift register 24a.
• the field effect transistors 2 0 a and 2 2 a are designed to be connected, and the shift resistors 24 b are connected to each other 3 ⁇ 4:
• the field effect transistors 2 0 b and 2 A selection pulse is provided to this shift register 2 4 b in contact with each gate of 2 b.
• the field effect transistors 20 b and 22 b of the field effect transistors 20 c and 22 c form a connection switch so that the field effect transistors 20 b and 22 b are turned on and the shift register 24 c is connected. This field effect transistor is connected to each gate when the selection pulse is supplied to this shift register 24c.
• the field effect transistors 2 0 a and 2 2 a, 2 0 b, 2 2 b, 2 0 c, and 2 2 c, which constitute the connection switch, are sequentially shifted by the clock signal. Because they are turned on sequentially by the selected node, they do not turn on simultaneously.
• 25 represents the constant current I flowing through each of the mirror side field effect transistors 1 1 a, 1 1 b and 1 1 c of the plurality of current mirror circuits shown in FIG.
• the field effect that constitutes each current mirror circuit is constant, and it is supplied to the non-inverted input terminal + of the operational amplifier circuit 5 in advance in response to variations in transistor characteristics.
• 3 F measure the reference voltages V a, V b and V c respectively, and store a storage device such as a ROM stored in the specified address. Show.
• This storage device 25 is used for the selection of the calendar mirror circuit and for the mirror mirror circuit of the charge mirror circuit 2 3.
• a predetermined reference voltage for supplying a constant current I to the field effect transistor is read out at a read address as shown in FIG. 3E.
• the digital reference voltage read out from the storage device 2 5 is supplied to the digital / light conversion circuit 2 6, and the output side of the digital analog conversion circuit 2 6 is provided.
• the reference voltages V a V b and V c shown in Fig. 3F to be obtained are supplied to the non-inverted input terminal + of the operation width circuit 5 in synchronization with the selection of the current mirror circuit.
• the field effect transistor 20a which forms this connection switch
• the current mirror circuit is on the reference side
• Field effect transistor 9a is a field effect transistor of a constant current generating portion
• the constant current I flows in the field effect transistor 1 1 a of the laser side.
• the memory device is selected by the read signal from the current mirror circuit selection and reference voltage read circuit.
• the reference voltage V a of one of the No. 1 color mirror circuits is read out, and this reference voltage V a is supplied to the non-inverting input terminal 10 of the operational amplifier circuit 5.
• a constant current I flows taking into account the variations in the characteristics of the field effect transistors 9a and 11a.
• the current of the field-effect transistor 9 b 9 c on the reference side is “0”.
• the current of the field effect mirror 1 1 b and 1 1 c on the mirror side is “0” only at the very beginning, but after being selected by the selection pulse, the current holding capacity 21 b, 2
• the charge held at 1 c can keep the constant current I flowing o
• the problem is solved by turning on 2 2 a, 2 O b, and 2 2 b, 2 0 c, and 2 2 c periodically.
• the power range selection circuit and the reference voltage extraction circuit are selected.
• V b and V c are generated and supplied to the non-inverting input terminal 10 of the operation width circuit 5, the field effect on the mirror side is fixed to a fixed value for each of the transistors 1 1 b and 1 1 c.
• Current I can flow o
• the current of the mirror side field effect transistors 1 1 a, 1 1 b and 11 c is constant so as to be constant in accordance with the selection cycle of a plurality of force lenticular mirror circuits.
• the current mirror may have the current holding capacity 2 1 a, 2 1 b, 2 1 other than the selected current mirror circuit among the plurality of current mirror circuits. Since the constant current I is made to flow only to the field effect transistors lla, lib, 11 c on the mirror side by c, the power consumption is improved by about half.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Microelectronics & Electronic Packaging (AREA)
• General Physics & Mathematics (AREA)
• Nonlinear Science (AREA)
• Electromagnetism (AREA)
• Radar, Positioning & Navigation (AREA)
• Automation & Control Theory (AREA)
• Computer Hardware Design (AREA)
• Theoretical Computer Science (AREA)
• Control Of Indicators Other Than Cathode Ray Tubes (AREA)
• Control Of El Displays (AREA)
• Control Of Electrical Variables (AREA)
• Control Of Voltage And Current In General (AREA)
• Continuous-Control Power Sources That Use Transistors (AREA)
• Electroluminescent Light Sources (AREA)
• Amplifiers (AREA)

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• 2004
  • 2004-11-10 JP JP2004326794A patent/JP4311340B2/ja not_active Expired - Fee Related
• 2005
  • 2005-11-01 TW TW094138251A patent/TW200636654A/zh not_active IP Right Cessation
  • 2005-11-09 DE DE602005024292T patent/DE602005024292D1/de not_active Expired - Lifetime
  • 2005-11-09 US US10/585,338 patent/US7808284B2/en not_active Expired - Fee Related
  • 2005-11-09 EP EP05806605A patent/EP1811358B1/en not_active Expired - Lifetime
  • 2005-11-09 WO PCT/JP2005/020978 patent/WO2006051992A1/ja not_active Ceased
  • 2005-11-09 KR KR1020067013364A patent/KR101127494B1/ko not_active Expired - Fee Related

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