WO2006035711A1 - D/a変換回路、表示パネル駆動回路および表示装置 - Google Patents
D/a変換回路、表示パネル駆動回路および表示装置 Download PDFInfo
- Publication number
- WO2006035711A1 WO2006035711A1 PCT/JP2005/017627 JP2005017627W WO2006035711A1 WO 2006035711 A1 WO2006035711 A1 WO 2006035711A1 JP 2005017627 W JP2005017627 W JP 2005017627W WO 2006035711 A1 WO2006035711 A1 WO 2006035711A1
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- Prior art keywords
- circuit
- dza
- conversion circuit
- switch
- region
- Prior art date
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 39
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims 1
- 210000004027 cell Anatomy 0.000 description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 19
- 229910052782 aluminium Inorganic materials 0.000 description 19
- 238000010586 diagram Methods 0.000 description 18
- 239000004973 liquid crystal related substance Substances 0.000 description 14
- 239000011159 matrix material Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 1
- 210000002858 crystal cell Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
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- 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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
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- 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
-
- 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
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
- H03M1/74—Simultaneous conversion
- H03M1/76—Simultaneous conversion using switching tree
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
-
- 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
-
- 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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3685—Details of drivers for data electrodes
- G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
- H03M1/662—Multiplexed conversion systems
Definitions
- the present invention relates to a DZA conversion circuit, a display panel drive circuit, and a display device. More specifically, the present invention is provided corresponding to a column pin of a display panel, and display data is DZA converted to drive a column-direction drive voltage or drive current.
- DZA conversion circuit DZA
- the occupied area can be greatly reduced, and the number of drive pins relative to the display panel is increased. It relates to the improvement of DZA that can be easily realized.
- the applicant's application is well known in which DZA is provided for column pins (Patent Documents 1 and 2).
- the DZA provided for the column pin receives the display data and the reference current, and the DZA converts the display data according to the reference current to correspond to the column pin of the OLED panel.
- Drive current or a current that is the source of this drive current is well known in which DZA is provided for column pins.
- the number of column line and row line terminal pins is larger than the above.
- Patent Document 1 Japanese Patent Laid-Open No. 2003-234655
- Patent Document 2 Japanese Patent Application Laid-Open No. 2003-308043
- the full-color QVGA of the organic EL display device that is currently being developed has 360 pins of 120 pins for each of R, G, and B, so three drivers are currently required.
- the voltage output type DZA is usually an EZD-MOS switch circuit that has a high withstand voltage (power supply voltage of about 20V) and a depletion MOS transistor (D-MOS) and an enhancement MOS transistor (E-MOS) connected in series. Is being used.
- the DZA 10 is powered by the reference current generation circuit 1, the selection circuit 2, and the buffer amplifier (bonorage follower) 3.
- the reference current generating circuit 1 uses 16 resistors R1 to R16 connected in series, and the DZA10 is generated between the resistors of the resistor dividing circuit of the reference current generating circuit 1.
- Selection circuit 2 receives the divided voltage. Then, display data of 4 bits D0 to D3 is added to the selection circuit 2, and the transistor group consisting of a large number of EZD-MOS switch circuits of the selection circuit 2 is selectively driven ONZOFF, and the reference voltage generation circuit 1 One of the divided voltages is selected and sent to the buffer amplifier 3, and the DZA conversion output voltage Vo is generated at the output terminal 3 a of the buffer amplifier 3.
- the white circle ( ⁇ ) is the E-MOS switch transistor TrE
- the black circle ( ⁇ ) is the D-MOS switch transistor TrD.
- Vin is an external reference input voltage applied to the reference voltage generation circuit 1.
- a source region and a drain region are formed at predetermined intervals below the gate regions of these transistors to which the control signal lines 8a to 8h are selectively connected, respectively.
- 9a to 9d are inverters, which are connected to the control signal lines 8a, 8c, 8e and 8g, respectively, and the gates to which the control signal lines 8a, 8c, 8e and 8g are connected by inverting the 4 bits D0 to D3. Add to each area.
- This resistance-divided DZA10 is arranged in the horizontal direction for one of the voltage dividing points of the resistors connected to the control signal lines 8a to 8h according to the display data "H" and "L” of the 4 bits D0 to D3. Select one row of switch transistor TrE and switch transistor TrD and turn on these transistors at the same time.
- One of the voltage at each voltage dividing point of each resistor corresponds to the value of the display data of 4 bits D0 to D3.
- the voltage at the selected voltage dividing point is the (+) of the amplifier 3 Added to the input.
- DZA conversion is performed and the analog voltage V is applied to the output terminal 3a. Will occur.
- the range C of the horizontally long rectangular frame indicated by the dotted line is usually one unit area (cell) formed as one of the circuit elements in the IC.
- a total of 8 switch transistor groups with 4 MOSs are provided in one unit area (cell) C.
- a guard ring is provided for each unit area C to divide the area, and the unit area C is arranged vertically or horizontally to constitute the DZA selection circuit 2.
- Contact pads 6 for wiring are provided at both ends of the unit area C, respectively.
- FIG. 7 is a layout explanatory diagram of a single-unit region (cell) C in which the switch transistors constituting the selection circuit 2 of the DZA in FIG. 6 are formed.
- reference numeral 4 denotes a source / drain formation region, in which a source or drain of each transistor or these elements is provided between the contact pads 6 at both ends with a predetermined interval corresponding to the gate interval. Both are formed.
- enhancement MOSTrE hereinafter referred to as E-MOSTrE
- D-MOSTrD depletion MOST rD
- E-MOSTrE and D-MOSTrD enhancement MOSTrE and depletion MOST rD are arranged in such a manner that the source, gate and drain are arranged in order, and the source of E-MOS TrE and the drain of the next D-MOSTrD are shared. It is formed as. In some cases, the drain of E-MOSTrE and the source of the next D-MOSTrD are formed as a common region.
- each gate region 5e is a gate region of the switch transistor TrE
- 5d is a gate region of the switch transistor TrD
- the gate regions 5e and 5d are formed in a strip shape over a predetermined interval for forming the source and drain regions. Since each transistor is a switch MOS, each gate region has a short gate length and a long gate width.
- the source / drain formation region 4 is formed as a set of source / drains in a region provided at a predetermined interval between contact pads 6 provided at both ends.
- Reference numeral 7 denotes a vertically-long rectangular guard ring provided inside the IC.
- the contact pad 6 and each of the switch transistors described above are formed inside the guard ring, forming one unit region (cell) C.
- guard ring 7 Provided in contact pad 6, guard ring 7, and gate regions 5e and 5d, respectively.
- the given square points are contacts.
- the DZA is provided corresponding to the terminal pins of a liquid crystal display panel or an organic EL panel
- an increase in the number of terminal pins of the liquid crystal display panel or the organic EL panel leads to an increase in driver ICs.
- the number of DZA bits in OLED displays has increased from 6 bits to 6 to 8 bits, and the area occupied by DZA in the driver tends to increase.
- the power supply voltage has dropped to around 15V due to the demand for lower power consumption. Therefore, in order to reduce the area occupied by DZA, it is conceivable to construct a switch circuit with a single point of breakdown voltage E-MOS.
- E-MOS breakdown voltage
- the contact pad 6 in one unit region, the contact pad 6 usually occupies an area of about four switch transistors in the DZA. Therefore, the percentage of contact pads 6 and guard rings 7 in a single IC is relatively large with respect to the number of switch transistors. Therefore, the reduction in the number of MOS transistors does not reduce the occupied area by the DZA occupied area in one IC.
- An object of the present invention is to solve such problems of the prior art, and to provide a DZA that can greatly reduce the occupied area when an IC is formed.
- Another object is to provide a display panel driving circuit and a display device that can easily realize a driver having a large number of drive pins for the display panel.
- the configuration of the DZA, display panel drive circuit or display device of the present invention includes a reference voltage for generating a plurality of analog voltages for DZA conversion at each of a plurality of terminals.
- a reference voltage for generating a plurality of analog voltages for DZA conversion at each of a plurality of terminals.
- a plurality of MOS switch transistors are arranged between each contact pad to form a unit region as a circuit element in the IC, and each contact pad at both ends of the unit region has a plurality of contact pads.
- Each one of the analog voltages is received, the center contact pad is connected to a predetermined output, and each switch transistor in the unit area is used as a switch circuit.
- the analog conversion voltage is obtained by selecting ONZOFF of several switch transistors.
- two analog voltages are received from the reference voltage generating circuit in one unit region. Since two analog voltages (voltage at the voltage dividing point) can be output with one contact pad, the conventional two unit areas become one area. In addition, since one mute area only requires three contact pads, one unit area for two units adds one contact pad to the total of two unit areas. Since it is the size obtained by subtracting one unit area, the area is smaller than two unit areas, and the total force of the unit area can be reduced to about half.
- One increased contact pad occupies an area of about 4 switch transistors in DZA, and the DZA conversion circuit uses multiple mute areas according to the number of conversion bits. As the number of bits is increased, the present invention can significantly reduce the occupied area.
- the present invention can reduce the occupied area of the DZA when it is integrated into an IC.
- the number of drive pins relative to the display panel is large, and the effect of reducing the occupied area of the driver DZA is significant.
- FIG. 1 is a circuit diagram of a 4-bit configuration DZA of one embodiment to which the DZA of the present invention is applied.
- FIG. 2 is an explanatory diagram of a layout of a region (cell) of one unit.
- FIG. 4 is an explanatory diagram of aluminum wiring for the unit area (cell) of FIG. 2
- FIG. 4 is a circuit diagram of a DZA of an embodiment for driving an active matrix type liquid crystal display panel
- FIG. 5 is an active matrix type organic EL panel.
- It is a circuit diagram of DZA of the Example which drives a channel.
- the same components as those shown in FIGS. 6 and 7 are denoted by the same reference numerals, and the description thereof is omitted.
- reference numeral 20 denotes a DZA, which includes a reference current generation circuit 1, a selection circuit 11, and a buffer amplifier 3.
- the selection circuit 11 is composed of the unit area CE, which is the upper and lower two-stage switch circuit group by E MOS, and selectively turns on and off E MOSTrE of the switch operation in response to the display data of 4 bits D0 to D3.
- unit region (cell) CE formed as one of the circuit elements in the IC, three contact pads 6 are provided (see FIG. 2).
- control signal lines 8a to 8h are selectively connected to one row of MOS operation E MOSTrE arranged in the horizontal direction of one of the voltage dividing points of the resistors according to the display data "H" and "L” of the 4 bits D0 to D3.
- each MOS transistor is selectively connected to each gate region of E MOSTrE at a cross connection point (). This is selected and input to the (+) input of buffer amplifier 3, and analog conversion voltage Vo is obtained at output terminal 3a.
- FIG. 2 is a layout diagram of one unit region (cell) CE.
- three contact pads 6 are provided at the upper and lower end portions and the central portion. Between the contact pads 6, that is, one of the contact pads 6 at the both ends and the center contact pad 6, and the other contact pad 6 at both ends and the center contact pad 6 respectively. In between, four rectangular gate regions 12 are provided as gate regions for switch MOS transistors. The length of the gate is short, but the width is long.
- the source and drain formation regions are provided as 4a and 4b, respectively, between the contact pads 6 provided at both ends and the center, and the source gate and drain of the E MOSTrE and the next E MOSTrE are arranged in order, and the source of the E MOSTrE And the drain of the next E MOSTr are formed as a common region.
- a gate region 12 of each E MOSTrE is formed between the source and the train at a predetermined interval as described above.
- the source and drain regions 4a and the source and drain regions 4b are respectively formed with four source and drain regions and a gate region of the EMOSTrE of switching operation.
- Each gate region 12 and contact pad 6 are each provided with a contact 13.
- Contact 13 is connected to one aluminum wiring in the upper aluminum wiring layer.
- FIG. 3 is a connection diagram of the aluminum wiring.
- the upper-layer aluminum wiring 14 is allocated so that two strips are arranged in the length direction (vertical direction) of each gate region 12.
- the two aluminum wirings 14 in each gate region 12 receive signals at the same digit position in the 4-bit display data (D0 to D3), respectively. As shown in FIG. When one of the two aluminum wires 14 receives a signal at one digit position with display data (one of D0 to D3), the other one receives the signal at the same digit position (D0 to D0 through the inverter). D1). Therefore, here, two aluminum wirings 14 are provided in each gate region 12.
- the contact 13 is arranged between the two aluminum wirings 14 in each gate region 12, the upper and lower aluminum wirings 14 and / or the shifted wiring lines can be located at the position of the contact 13 as well. By extending the area over the contact 13 and extending it, it can be easily and selectively connected to one aluminum wiring 14 at any time. Of course, it may not be connected to a certain gate region 12.
- connection with the aluminum wiring 14 is made so that a part of the contact 13 overlaps with a part of each of the two aluminum wirings 14, and the wiring of the aluminum wiring 14 on the wiring side is the same.
- ⁇ It is also possible to make contact with one of the aluminum wirings 14 at the overlap portion without providing an insulating layer under the wrap.
- the aluminum wiring 14 and the contact 13 are not connected because they are connected to the E-MOSTrE gate region of the region CE of the adjacent unit. Therefore, the connection part is shown.
- two aluminum wirings 14 are provided for each gate region 12 and selectively connected to the gate region 12. Then, by reducing the contact pad 6 by 1 and making the 2 X unit area (cell) C in FIG. 6 a 1 unit area (cell) CE, the area of 4 switch transistors is increased. Unit area (cell) The occupied area of C can be reduced.
- the unit area (cell) CE plays the role of two conventional units, the density of the unit area (cell) is higher if the area for forming two guard rings, etc. is included. This is equivalent to the fact that they are adjacently arranged in the above, and the occupied area is further reduced.
- the area (cell) CE of one unit is required to be accumulated times the number of conversion bits of “2” according to the number of digits of conversion data, so that a large occupied area is reduced.
- the number of terminal pins of the organic EL panel is doubled, so the effect of reducing the occupied area is even greater.
- FIG. 4 is an explanatory diagram of the DZA corresponding to FIG. 1 in the case of 6 bits, and relates to a voltage driving circuit for driving an active matrix type liquid crystal display panel.
- Reference numeral 21 denotes a DZA, which includes a reference current generation circuit 1, a selection circuit 15, and a buffer amplifier 3.
- the reference current generating circuit 1 is a circuit using a resistor voltage dividing circuit of 64 resistors R1 to R64 connected in series.
- the display data input to the selection circuit 15 is 6 bits D0 to D5.
- 16 is a driver IC for driving a liquid crystal display panel
- 17 is its output terminal pin
- 18 is a pixel circuit in the active matrix liquid crystal display panel
- 18a is a liquid crystal that receives the output voltage of D ZA21 This is the terminal pin of the display panel 18.
- the pixel circuit 18 outputs the output of the driver IC 16 as a source driver when the N-channel MOS transistor TM is turned ON / OFF by a signal (Y line side input) from a gate driver (not shown) and this transistor is turned ON.
- the voltage generated at terminal pin 17 is the terminal pin 18 It is applied to the liquid crystal cell CL as a load via a (X line side input).
- FIG. 5 is an explanatory diagram corresponding to FIG. 1 in the case of 6 bits, and relates to a voltage driving circuit for driving an active matrix organic EL panel.
- the active matrix liquid crystal display panel 18 shown in FIG. 4 is replaced with an active organic EL panel 180.
- 16 is a driver IC that drives the organic EL panel
- 17 is its output terminal pin
- 180 is a pixel circuit in the active organic EL panel
- 18a is an active that receives the output voltage of ⁇ / A21. This is the terminal pin of the type OLED panel 18.
- Reference numeral 19 denotes an organic EL element provided in the pixel circuit.
- the driving operation of this is a difference between the liquid crystal panel power and the organic EL panel, and the operation as a force voltage driving is not substantially different.
- the reference current generating circuit 1 of the embodiment is of a resistance voltage dividing type. 1S
- the reference current generating circuit 1 has an analog for DZA conversion at a number of terminals. Any circuit configuration may be used as long as voltage is generated at each terminal.
- the DZA of the embodiment may be used as a current output DZA by converting the converted output voltage into a current, for example, by providing a voltage-current conversion circuit on the output side.
- a current output DZA by converting the converted output voltage into a current, for example, by providing a voltage-current conversion circuit on the output side.
- This also makes it possible to drive organic EL panels.
- the DZA of the present invention is not limited to those applied to an organic EL drive circuit or an organic EL display device.
- FIG. 1 is a circuit diagram of DZA having a 4-bit configuration according to an embodiment to which the DZA of the present invention is applied.
- FIG. 2 is an explanatory diagram of a layout of one unit region (cell).
- FIG. 3 is an explanatory diagram of aluminum wiring for the unit area (cell) in FIG. 2.
- Fig. 4 shows the DZA of an embodiment for driving an active matrix liquid crystal display panel. It is a circuit diagram.
- FIG. 5 is a circuit diagram of a DZA of an embodiment for driving an active matrix organic EL panel.
- FIG. 6 is an explanatory diagram of a DZA transistor configuration in a conventional organic EL drive circuit.
- FIG. 7 is a layout explanatory diagram of one unit region (cell) in which the switch transistor constituting the DZA of FIG. 5 is formed.
- Reference voltage generation circuit resistance voltage divider
- Enhancement MOS transistor (E-MOS) gate region 5e ... Enhancement MOS transistor (E-MOS) gate region
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- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Analogue/Digital Conversion (AREA)
- Metal-Oxide And Bipolar Metal-Oxide Semiconductor Integrated Circuits (AREA)
- Semiconductor Integrated Circuits (AREA)
- Liquid Crystal Display Device Control (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US11/575,692 US7482963B2 (en) | 2004-09-29 | 2005-09-26 | D/A conversion circuit, display panel drive circuit, and display |
JP2006537720A JP4538003B2 (ja) | 2004-09-29 | 2005-09-26 | D/a変換回路、表示パネル駆動回路および表示装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004284468 | 2004-09-29 | ||
JP2004-284468 | 2004-09-29 |
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WO2006035711A1 true WO2006035711A1 (ja) | 2006-04-06 |
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PCT/JP2005/017627 WO2006035711A1 (ja) | 2004-09-29 | 2005-09-26 | D/a変換回路、表示パネル駆動回路および表示装置 |
Country Status (6)
Country | Link |
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US (1) | US7482963B2 (ja) |
JP (1) | JP4538003B2 (ja) |
KR (1) | KR100862111B1 (ja) |
CN (1) | CN101027841A (ja) |
TW (1) | TW200625226A (ja) |
WO (1) | WO2006035711A1 (ja) |
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JP5581261B2 (ja) * | 2011-04-27 | 2014-08-27 | 株式会社ジャパンディスプレイ | 半導体装置、表示装置および電子機器 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04358418A (ja) * | 1991-06-05 | 1992-12-11 | Asahi Kasei Micro Syst Kk | 多チャンネルd/a変換器 |
JPH0621332A (ja) * | 1992-07-03 | 1994-01-28 | Nec Corp | 多チャンネルd/a変換装置 |
JP2003323161A (ja) * | 2002-04-30 | 2003-11-14 | Himax Optoelectronics Corp | デコーダの回路配置およびその方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW521223B (en) * | 1999-05-17 | 2003-02-21 | Semiconductor Energy Lab | D/A conversion circuit and semiconductor device |
TW531971B (en) * | 2000-11-24 | 2003-05-11 | Semiconductor Energy Lab | D/A converter circuit and semiconductor device |
JP3647846B2 (ja) | 2002-02-12 | 2005-05-18 | ローム株式会社 | 有機el駆動回路および有機el表示装置 |
JP3924179B2 (ja) | 2002-02-12 | 2007-06-06 | ローム株式会社 | D/a変換回路およびこれを用いる有機el駆動回路 |
KR100671648B1 (ko) * | 2005-12-08 | 2007-01-19 | 삼성에스디아이 주식회사 | 데이터 구동부 및 이를 이용한 유기 발광 표시장치와 그의구동방법 |
-
2005
- 2005-09-26 JP JP2006537720A patent/JP4538003B2/ja not_active Expired - Fee Related
- 2005-09-26 CN CNA2005800324813A patent/CN101027841A/zh active Pending
- 2005-09-26 KR KR1020077007058A patent/KR100862111B1/ko not_active IP Right Cessation
- 2005-09-26 US US11/575,692 patent/US7482963B2/en active Active
- 2005-09-26 TW TW094133308A patent/TW200625226A/zh unknown
- 2005-09-26 WO PCT/JP2005/017627 patent/WO2006035711A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04358418A (ja) * | 1991-06-05 | 1992-12-11 | Asahi Kasei Micro Syst Kk | 多チャンネルd/a変換器 |
JPH0621332A (ja) * | 1992-07-03 | 1994-01-28 | Nec Corp | 多チャンネルd/a変換装置 |
JP2003323161A (ja) * | 2002-04-30 | 2003-11-14 | Himax Optoelectronics Corp | デコーダの回路配置およびその方法 |
Also Published As
Publication number | Publication date |
---|---|
US20080117089A1 (en) | 2008-05-22 |
JP4538003B2 (ja) | 2010-09-08 |
KR20070058544A (ko) | 2007-06-08 |
JPWO2006035711A1 (ja) | 2008-05-15 |
US7482963B2 (en) | 2009-01-27 |
TW200625226A (en) | 2006-07-16 |
CN101027841A (zh) | 2007-08-29 |
KR100862111B1 (ko) | 2008-10-09 |
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