WO2007135805A1 - 表示パネル駆動回路、表示装置 - Google Patents
表示パネル駆動回路、表示装置 Download PDFInfo
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- WO2007135805A1 WO2007135805A1 PCT/JP2007/055647 JP2007055647W WO2007135805A1 WO 2007135805 A1 WO2007135805 A1 WO 2007135805A1 JP 2007055647 W JP2007055647 W JP 2007055647W WO 2007135805 A1 WO2007135805 A1 WO 2007135805A1
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- stage
- latch
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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
- 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
-
- 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
- G09G2310/0202—Addressing of scan or signal lines
- G09G2310/0218—Addressing of scan or signal lines with collection of electrodes in groups for n-dimensional addressing
-
- 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
- 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
- G09G2310/0294—Details of sampling or holding circuits arranged for use in a driver 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
- 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
- G09G2310/0297—Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns
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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
- G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
Definitions
- the present invention relates to a source driver (particularly, a digital dryer) provided in a display device.
- Patent Document 1 discloses a configuration example of a digital driver used in a display device.
- Figure 9 shows this configuration.
- the digital driver shown in FIG. 9 has a circuit block including a plurality of first (1st) latch circuits LAT1 and a plurality of second (2nd) latch circuits LAT2 for each data signal line (S1 ′) of the display panel. .
- each circuit block takes in D0 to D2 as 3-bit data to be supplied to a corresponding data signal line by a pulse from the DFF of the shift register (1st latch pulse).
- the 3-bit data is DA-converted by the pulse from the LP line (2nd latch pulse) and output to each data signal line (Sl, S2 '%) as an analog signal potential.
- Patent Document 1 discloses another configuration example of a digital driver.
- Figure 10 shows this configuration.
- the digital driver shown in FIG. 10 includes a circuit block including a plurality of first (1st) latch circuits L ATI and a plurality of second (2nd) latch circuits LAT2, and four data signal lines (S1 to S4) of the display panel. , S5 to S8.
- one horizontal period (first to fourth periods) is divided into four, and one circuit block is shared by four data signal lines.
- each circuit block uses 3-bit data to be supplied to the corresponding data signal line (Sl, S5 '%) by a pulse from the DFF of the shift register (1st latch pulse). Is taken from D0 to D2, and the above 3-bit data is DA converted by the pulse (2nd latch pulse) from the LPa'LPb line, and the analog signal potential is applied to each data signal line (Sl, S5 ' ⁇ ). Output as.
- each circuit block receives the corresponding data signal line (S2) by the pulse from the DFF of the shift register (1st latch pulse).
- Patent Document 1 Japanese Published Patent Publication “Japanese Unexamined Patent Publication No. 2003-58133 (Publication Date: February 28, 2003)”
- the present invention has been made in view of the above problems, and an object thereof is to realize downsizing of a driver without requiring an external memory or an arithmetic circuit.
- the display panel drive circuit of the present invention is a display panel drive circuit that includes a plurality of circuit blocks including a front-stage circuit and a rear-stage circuit, and in each circuit block, a signal from the front-stage circuit is transmitted to the rear-stage circuit.
- Procedural shared wiring that can be connected to each of the two adjacent circuit blocks is provided, and the signal power in each of the two adjacent circuit blocks is transmitted in a time-sharing manner via the shared wiring between the blocks. It is characterized by.
- each of two adjacent circuit blocks uses the same inter-block shared wiring and performs signal transmission in a time division manner.
- the number of wirings can be reduced, and the size of the display panel drive circuit can be reduced.
- the display panel drive circuit is monolithically formed on the display panel, the size reduction effect due to the reduction in the number of wires is significant.
- the signal includes a plurality of video signals
- the front circuit includes a front signal circuit corresponding to each video signal
- the rear circuit corresponds to each video signal. It has a post-stage signal circuit
- the inter-block shared wiring has signal-specific shared wiring corresponding to each video signal
- Each video signal may be input to the corresponding upstream signal circuit and transmitted to the corresponding downstream signal circuit via the corresponding signal-specific shared wiring.
- a switch circuit may be provided between each preceding-stage signal circuit and the corresponding signal-specific shared wiring.
- the switch circuit between the preceding signal circuit belonging to the odd-numbered circuit block and the corresponding signal-specific shared wiring is connected to the first control signal line, and the preceding signal circuit belonging to the even-numbered circuit block.
- a switch circuit between the corresponding common wiring for each signal may be connected to the second control signal line.
- the display panel driving circuit includes one signal passing circuit for each circuit block, and each circuit block is provided with a signal-to-signal shared wiring to which all subsequent signal circuits belonging to the circuit block can be connected.
- a signal from the subsequent signal circuit may be transmitted to the signal via circuit in a time division manner via the inter-signal shared wiring.
- the signal passing circuit may be a DAC circuit. In this way, the number of DAC circuits can be reduced.
- each front-stage signal circuit includes the same number of first latch circuits as the number of bits of the corresponding video signal, and each rear-stage signal circuit has the number of bits of the corresponding video signal.
- An equal number of second latch circuits may be provided, and each signal shared wiring may include a number of wirings equal to the number of bits of the corresponding video signal.
- the latch pulse to the second latch circuit of the latter-stage signal circuit may be supplied by a wiring different from the signal-specific shared wiring. In this case, the latch pulse to the second latch circuit of the subsequent signal circuit belonging to the odd-numbered circuit block is supplied by the first control signal line, and to the second latch circuit of the subsequent signal circuit belonging to the even-numbered circuit block.
- the latch pulse force is preferably supplied by the second control signal line.
- the display panel driving circuit of the present invention includes a plurality of circuit blocks including a plurality of front-stage signal circuits and rear-stage signal circuits corresponding to the respective front-stage signal circuits, and signals from the respective front-stage signal circuits are received in each circuit block.
- a display panel drive circuit that is transmitted to the corresponding post-stage signal circuit, and each circuit block is provided with an intra-block shared wiring to which all the pre-stage signal circuits belonging to this circuit block can be connected and each pre-stage signal circuit power. Is transmitted in a time-sharing manner through the shared wiring in the block.
- the number of wires can be reduced by using time-division signal transmission from each front-stage signal circuit to the corresponding rear-stage signal circuit using the shared wiring in the block, and the size of the display panel drive circuit Can be reduced.
- the display panel driving circuit is monolithically formed on the display panel, the effect of reducing the size by reducing the number of wirings is large.
- the signal includes a plurality of video signals, the preceding signal circuit is provided corresponding to each video signal, and the above-described latter stage corresponding to each video signal.
- a signal circuit is provided, and each video signal may be input to the corresponding preceding signal circuit and transmitted to the corresponding succeeding signal circuit via the intra-block shared wiring.
- a switch circuit corresponding to the preceding signal circuit may be provided between each preceding signal circuit and the shared wiring in the block.
- each front-stage signal circuit includes a number of first latch circuits equal to the number of bits of the corresponding video signal, and each rear-stage signal circuit has the number of bits of the corresponding video signal.
- the number of second latch circuits may be provided, and the shared wiring in each block may include a number of wirings equal to the number of bits of the corresponding video signal.
- the latch pulse to the second latch circuit of the post-stage signal circuit may be supplied by a wiring different from the common wiring in the block.
- a control signal line equal to the number of video signals is provided, and the control signal of the switch circuit corresponding to each preceding signal circuit and the latch pulse to each second latch circuit of the succeeding signal circuit corresponding to the preceding signal circuit are provided. It is preferable to be supplied by the same control signal line.
- a display device of the present invention includes a display panel and the display panel driving circuit.
- the display panel and the display panel drive circuit are formed monolithically. May be.
- An example of the display device is a liquid crystal display device.
- two adjacent circuit blocks each perform signal transmission using the same inter-block shared wiring.
- the number of wirings can be reduced, and the size of the display panel driving circuit can be reduced.
- FIG. 1 is a circuit diagram showing one configuration of a digital driver according to the present embodiment.
- FIG. 2 is a circuit diagram specifically showing a partial configuration of the digital driver shown in FIG. 1.
- FIG. 2 is a circuit diagram specifically showing a partial configuration of the digital driver shown in FIG. 1.
- FIG. 3 is a circuit diagram specifically showing a partial configuration of the digital driver shown in FIG. 1.
- FIG. 3 is a circuit diagram specifically showing a partial configuration of the digital driver shown in FIG. 1.
- FIG. 4 is a circuit diagram showing a modification of the digital driver shown in FIG. 1.
- FIG. 5 is a circuit diagram showing another configuration of the digital driver.
- FIG. 6 is a schematic diagram showing a configuration of the present liquid crystal display device.
- FIG. 7 is a timing chart showing the operation of the digital driver shown in FIG. 1.
- FIG. 8 is a timing chart showing the operation of the digital driver shown in FIG.
- FIG. 9 is a circuit diagram showing a configuration of a conventional digital driver.
- FIG. 10 is a circuit diagram showing a configuration of a conventional digital driver.
- iR-iG-iB (For transmission switching) switch circuit MR-MG-MB Transmission switching line (control signal line)
- FIG. 6 is a block diagram showing a configuration of a liquid crystal display device which is useful for the present embodiment.
- the liquid crystal display device 10 includes a display unit 30, a gate dryer 40, and a source driver 90.
- the display unit 30, the gate dryer O, and the source driver 90 are formed on the same substrate and constitute a so-called system-on-panel.
- the source driver 90 is supplied with input signals (video data) and various control signals.
- pixels are provided in the vicinity of intersections of a plurality of scanning signal lines extending in the row (horizontal) direction and a plurality of data signal lines extending in the column (vertical) direction.
- FIG. 1 is a circuit diagram showing a configuration of a source driver of the present liquid crystal display device.
- the source driver 90 is a digital driver that generates a digital input signal (for example, 6 bits) force analog signal potential input from outside the panel and supplies the signal potential to each data signal line of the display unit 30.
- the digital driver 90 includes a plurality of signal processing blocks (not shown), three input signal lines DR'DG'DB, and three switch control lines PR'PG '. PB and two latch pulse lines Yl-Y2 (first and second control signal lines) are provided.
- Each signal processing block includes one flip-flop F (in the shift register), one circuit block g, one DAC, and one time-division switch block W.
- the three data signal lines SR'SG'SB of the display unit are compatible.
- Each time-division switch block W has three analog switches ER ⁇ EG ⁇ EB.
- each circuit block g includes three front-stage latch blocks arranged in the column direction (pre-stage signal circuit), a front-stage circuit having BR, BG, and BB, and three rear-stage latch blocks arranged in the column direction (rear-stage signal blocks).
- a post-stage circuit having CR'CG'CB, one transmission switch block T, one selection switch block K, and one inter-signal shared wiring (6 bits) CL are provided.
- a plurality of circuit blocks are arranged in the row direction in the digital driver 90, and an inter-block shared wiring Q is formed between two adjacent circuit blocks (for example, the first and second, the third and the fourth). Establishment It is done.
- the inter-block shared wiring Q has three signal-specific shared wirings HR'HG'HB.
- the transmission switch block T includes three switch circuits iR'iG'iB.
- each of the switch circuits iR, iG, and iB has 6-bit switching elements corresponding to HR-HG-HB, and the transmission switch block T has 18-bit switching elements.
- the selection switch block K includes three switch circuits JR'JG'JB.
- the selection switch circuits JR • JG 'JB are each provided with 6-bit switching elements corresponding to the subsequent latch blocks CR, CG, and CB, and the selection switch block K is provided with 18-bit switching elements.
- the first signal processing block includes a flip-flop Fl, a circuit block gl, a DAC 1, and a time division switch block W1, and corresponds to three data signal lines SRl 'SGl' SBl.
- the time-division switch block W1 includes three analog switches ER1 ⁇ EGl 'EBl.
- the circuit block gl is composed of three preceding latch blocks BRl 'BG 1 ⁇ ⁇ 1, three succeeding latch blocks 0 ⁇ 1' 01 '81, transmission switch block Tl, selection switch block Kl, and signal sharing It has wiring CL1.
- the transmission switch block T1 includes three switch circuits iRl 'iGl' iBl, and the selection switch block K1 includes three switch circuits JRl 'JGl' JBl. Further, an inter-block shared wiring Q1 is provided between the circuit block gl and the adjacent circuit block g2, and the inter-block shared wiring Q1 includes a signal-specific shared wiring HR1′HG1 ⁇ ⁇ 1.
- each preceding-stage latch block is connected to a corresponding flip-flop and a corresponding input signal line, and further, a corresponding switch circuit and a corresponding signal-specific shared wiring It is connected to the corresponding latter latch block via (6 bits).
- each subsequent-stage latch block is connected to the DAC via the corresponding switch circuit and inter-signal shared wiring (6 bits), and is also connected to the latch noise line Y1 or ⁇ 2.
- the pre-stage latch block BR1 is connected to the flip-flop F1 and the input signal line DR, and further connected to the post-stage latch block CR1 via the switch circuit iRl and the signal-specific shared wiring HR1 (6 bits).
- the subsequent latch block CR1 is connected to the DAC1 through the switch circuit JR1 and the inter-signal shared wiring CL1 (6 bits) and also to the latch pulse line Y1.
- the preceding latch block BR2 is connected to the flip-flop F2. Is connected to the input signal line DR, and connected to the subsequent latch block CR2 through the switch circuit 1R2 and the signal-specific shared wiring HR 1 (6 bits).
- the latter latch block CR2 is connected to the DAC2 via the switch circuit JR2 and the inter-signal shared wiring CL2 (6 bits), and is also connected to the latch noise line Y2.
- Each front-stage latch block includes six 1st (first) latch circuits arranged in the column direction, and each rear-stage latch block includes six 2nd (second) latch circuits arranged in the column direction.
- the front latch block BR1 includes 1st latch circuits L R1 to LR6, and the rear latch block CR1 includes 2nd latch circuits Lrl to Lr6.
- the connection relationship between the preceding latch block BR1 and the succeeding latch block CR1 will be described in more detail as follows. That is, all of the six 1st latch circuits LR1 to LR6 belonging to the preceding latch block BR1 are connected to the corresponding flip-flop F1. Each of the 1st latch circuits LR1 to LR6 is connected to a corresponding wiring (1 bit wiring) in the input signal line DR (6 bit wiring). Furthermore, the 1st latch circuits LR1 to LR6 are connected to the corresponding 2nd latch circuit in the subsequent latch block CR1 via the corresponding wiring in the switch circuit iRl and the signal-specific shared wiring HR1 (6-bit wiring).
- the 1st latch circuit LR1 is connected to the 2nd latch circuit Lrl via the corresponding wiring (1-bit wiring) in the switch circuit iRl and signal-specific shared wiring HR1, and the 1st latch circuit LR6 is connected to the switch circuit 1R1 and the signal.
- Separate shared wiring Connected to the 2nd latch circuit Lr6 via the corresponding wiring (1-bit wiring) in HR1.
- the 2nd latch circuits Lrl to Lr6 are all connected to the latch pulse line Y1 and connected to the DAC1 via the corresponding switch circuit JR1 and the corresponding wiring (1-bit wiring) in the inter-signal shared wiring CL1.
- the switch circuit iRl is connected to the latch pulse line Y1.
- the 1st latch circuit LR1 is connected to the 2nd latch circuit Lrl via the corresponding wiring (1-bit wiring) in the switch circuit iR2 and the signal-specific shared wiring HR1
- the 1st latch circuit LR6 is connected to the switch circuit 1R2 and Shared wiring by signal Connected to the 2nd latch circuit Lr 6 via the corresponding wiring (1-bit wiring) in HR1.
- the second latch circuits Lrl to Lr6 are all connected to the latch pulse line Y2 and to the DAC2 via the corresponding switch circuit JR2 and the corresponding wiring (1-bit wiring) in the signal-to-signal shared wiring CL2. ing.
- the switch circuit iR2 is connected to the latch pulse line Y2.
- the transmission switch block belonging to the odd-numbered circuit block is turned ON, and a latch pulse enters the subsequent-stage latch block of the circuit block, and the odd-numbered circuit block
- the signal power latched in the previous latch block is output from the subsequent latch block via the shared wiring between blocks.
- the latch pulse line Y2 becomes active, the transmission switch block belonging to the even-numbered circuit block is turned ON, and a latch pulse is input to the subsequent-stage latch block of the circuit block, and the preceding-stage latch of the even-numbered circuit block.
- the signal power latched in the block is output from the subsequent latch block via the inter-block shared wiring.
- each of the three switch circuits CiR'JG-JB) included in each selected switch block is connected to a corresponding switch control line (PR'PG'PB). That is, the switch circuit JR1 of the selection switch block K1 is connected to the switch control line PR, the switch circuit JG1 is connected to the switch control line PG, and the switch circuit JB1 is connected to the switch control line PB.
- Each DAC is connected to three data signal lines via the corresponding time-division switch block W. Connected. For example, DAC1 is connected to the data signal line SRl 'SGl' SBl via the time division switch block W1.
- each of the three analog switches (ER'EG'EB) included in each time-division switch block W is connected to a corresponding switch control line (PR'PG'PB) and a corresponding data signal line. (SR 'SG' SB) is connected.
- the analog switch ER1 of the time-division switch block W1 is connected to the switch control line PR and connected to the data signal line SR1, and the analog switch EG 1 is connected to the switch control line PG and the data signal line SG1.
- the analog switch EB 1 is connected to the switch control line PB and to the data signal line SB 1.
- the processing of the red (R) signal is performed by the front stage latch block BR, the switch circuit iR, the signal-specific shared wiring HR, the rear stage latch block CR1, and the switch connected to the red input signal line DR.
- the circuit JR, DAC, and analog switch ER are in charge, and the processed analog signal is output to the red data signal line SR.
- Each DAC is responsible for processing the three color signals in a time-sharing manner.
- a signal processing flow in the digital driver 90 is shown in a timing chart of FIG.
- R1 to R640 are 6-bit input signal data corresponding to the data signal lines SR1 to SR640
- G1 to G640 are 6-bit input signal data corresponding to the data signal lines SG1 to SG640
- B1 to B640 are 6-bit input signal data corresponding to data signal lines SB1 to SB640.
- the output signal of the front latch block is Bo and the output of the rear latch block is Co.
- Qol to Qo320 represent the signals of the inter-block shared wiring
- CLol to CLo 640 represent the signals of the inter-signal shared wiring.
- the previous latch block BR1 receives the input signal R1
- the previous latch block BG1 receives the input signal G1
- the previous latch block BB1 receives the input signal B1, Latch.
- (R2, G2, B2)... (R640, G640, B640) are sequentially latched as the output pulses of F2 ' ⁇ ' F640 are sequentially changed from High to Low.
- switch control All switch circuits connected to line PB (JB1 ⁇ ⁇ ⁇ are simultaneously turned ON, and the input signal (B1 ⁇ ⁇ ⁇ ) is input to the corresponding DAC (1 ⁇ ⁇ ⁇ ).
- B640) is converted to an analog signal potential (Bal ' ⁇ -Ba640), where the switch control line PB is also connected to the corresponding analog switch, and the output pulse of the switch control line PB is Since all the analog switches (EB1 ••) connected to the switch control line PB are turned ON at the same time when the signal goes High, the corresponding data via the analog switches where the signal potential (Bal •• -Ba640) is turned ON respectively. Supplied to the signal line (SB 1 ⁇ --SB640).
- the digital driver 90 can also be configured as shown in FIG. In other words, the configuration shown in Fig. 1 excludes the selected switch block K, the time-division switch block W, and the three switch control lines PR, PG, and PB, while providing three DACs for each signal processing block. It is a configuration. Other configurations are the same as those in FIG.
- each signal processing block includes one flip-flop F, one circuit block g, and three DACs.
- the three data signal lines SR 'SG ⁇ SB on the display unit correspond to the signal processing block!
- the circuit block g includes three front-stage latch blocks BR′B G′BB arranged in the column direction, and three rear-stage latch blocks CR′CG′CB arranged in the column direction.
- One transmission switch block T One transmission switch block
- Each post-stage latch block is connected to one data signal line via one DAC.
- the rear stage latch block CR1 is connected to the data signal line SR1 via DAClr
- the rear stage latch block CG1 is connected to the data signal line SG1 via DAClg
- the rear stage latch block CB1 is connected to the data signal line SB1 via DAClb. Connected to.
- two adjacent circuit blocks each use the same inter-block shared wiring Q and perform signal transmission in a time division manner in the driver.
- the number of wires can be reduced.
- each rear latch block (CR'CG'CB) performs signal transmission to the DAC in time division via the same inter-signal shared wiring CL, so the number of wiring between the latter latch block and the DAC can be reduced. .
- a digital driver is monolithically formed on a liquid crystal panel, the effect of reducing the driver size by reducing the number of wirings is significant.
- the digital driver can also be configured as shown in FIG.
- the digital driver 95 includes a plurality of signal processing blocks (not shown), three input signal lines DR'DG • DB, and three switch control lines PR'PG'PB. 3 (number of video signals) transmission switching line (control signal line) MR-MG-MB.
- Each signal processing block includes one flip-flop F (in the shift register), one circuit block g, one DAC, and one time-division switch block W.
- the three data signal lines SR'SG'SB of the display unit are compatible.
- Each time-division switch block W has three analog switches ER ⁇ EG ⁇ EB.
- each circuit block g includes three pre-stage latch blocks (pre-stage signal circuits) arranged in the column direction, a pre-stage circuit having BR, BG, and BB, and three post-stage latch blocks (post-stage signals) arranged in the column direction.
- the transmission switch block T includes three switch circuits iR'iG'iB.
- the switch circuits iR, iG, and iB each have a 6-bit switching element corresponding to HR-HG-HB, and the transmission switch block T has an 18-bit switching element.
- the selected switch block K includes three switch circuits JR'JG'JB.
- each of the selection switch circuits JR-JG 'JB includes a 6-bit switching element corresponding to the subsequent latch block CR' CG ⁇ CB, and the selection switch block K includes an 18-bit switching element.
- the first signal processing block includes a flip-flop Fl, a circuit block gl, a DAC 1, and a time division switch block Wl, and corresponds to three data signal lines SRl 'SGl' SBl.
- the time-division switch block W1 includes three analog switches ER1 ⁇ EGl 'EBl.
- the circuit block gl is composed of three front-stage latch blocks BRl 'BG 1 ⁇ ⁇ 1, three rear-stage latch blocks CR1' CG1 'CB1, in-block shared wiring Nl, transmission switch block Tl, selection switch block Kl, and between signals Has shared wiring CL1.
- the transmission switch block T1 is equipped with three switch circuits iRl 'iGl' iBl.
- the selection switch block Kl has three switch circuits JR1 -JG1 'JB1.
- each preceding-stage latch block is connected to a corresponding flip-flop and a corresponding input signal line, and further, a corresponding switch circuit of the transmission switch block and intra-block sharing It is connected to the corresponding subsequent latch block via wiring (6 bits).
- each subsequent-stage latch block is connected to the DAC via the corresponding switch circuit of the selected switch block and the inter-signal shared wiring (6 bits), and is also connected to the corresponding transmission switching line.
- the switch circuit of the transmission switch block is connected to the transmission switching line.
- the front-stage latch block BR1 is connected to the flip-flop F1 and the input signal line DR, and further connected to the rear-stage latch block CR1 via the switch circuit iRl and the in-block shared wiring N1 (6 bits). ing. Further, the latter latch block CR1 is connected to the DAC1 via the switch circuit JR1 and the inter-signal shared wiring CL1 (6 bits), and is also connected to the transmission switching line MR. A switch circuit 1R1 (of the transmission switch block T1) is connected to the transmission switching line MR.
- the latter latch block CR is connected to the transmission switching line MR
- the latter latch block CG is connected to the transmission switching line MG
- the latter latch block CB is connected to the transmission switching line MB.
- the switch circuit iR of the transmission switch block is connected to the transmission switching line MR
- the switch circuit iG is connected to the transmission switching line MG
- the switch circuit iB is connected to the transmission switching line MB.
- each of the three switch circuits included in each selected switch block is connected to a corresponding switch control line. That is, the switch circuit JR1 of the selected switch block K1 is connected to the switch control line PR, the switch circuit JG1 is connected to the switch control line PG, and the switch circuit JB1 is connected to the switch control line PB.
- Each DAC is connected to three data signal lines via corresponding time division switch blocks.
- DAC1 is connected to the data signal line SR1 ′ via the time division switch block W1.
- analog switch ER1 of time-division switch block W1 is connected to switch control line PR and connected to data signal line SR1
- analog switch EG 1 is connected to switch control line PG and connected to data signal line SG1.
- the analog switch EB1 is connected to the switch control line PB and to the data signal line SB1.
- the processing of the red (R) signal is performed by the front-stage latch block BR1 connected to the red input signal line DR, and the corresponding switch circuit iRl, intra-block shared wiring Nl, and rear-stage latch block.
- CR1, switch circuit JR1, and analog switch ER1 are in charge.
- G green
- B blue
- DAC1 is responsible for the three color signals in a time-sharing manner.
- a signal processing flow in the digital driver 95 is shown in the timing chart of FIG.
- R1 to R640 are 6-bit input signal data corresponding to the data signal lines SR1 to SR640
- G1 to G640 are 6-bit input signal data corresponding to the data signal lines SG1 to SG640
- B1 to B640 are 6-bit input signal data corresponding to data signal lines SB1 to SB640.
- Nol to No640 represent signals in the block shared wiring
- CLol to CL 640 represent signals in the inter-signal shared wiring.
- the previous latch block BR1 receives the input signal R1
- the previous latch block BG1 receives the input signal G1
- the previous latch block BB1 receives the input signal B1, Latch.
- F2 'and' F640 output pulses are sequentially H (R2, G2, B2)... (R640, G640, B640) are sequentially latched as igh ⁇ Low.
- the output pulse of the transmission switching line MR becomes High.
- all the switch circuits iR connected to MR are turned ON, and all input signals (R1 to R640) latched in the preceding latch block BR are output to the succeeding latch block CR via the intra-block shared wiring N.
- the output pulse of the transmission switching line MG becomes High.
- all the switch circuits iG connected to MG are turned ON, and all the input signals (G1 to G640) latched in the preceding latch block GR are output to the succeeding latch block CG via the intra-block shared wiring N.
- the output pulse of the transmission switching line MB becomes High.
- all switch circuits iB connected to MB are turned ON, and all the input signals (G1 to G640) latched in the preceding latch block BG are output to the subsequent latch block CB through the shared wiring N in the block. Is done.
- signal transmission (BR ⁇ CR, BG ⁇ CG, BB ⁇ CB) to the subsequent latch block corresponding to each preceding latch block force is performed in a time-sharing manner using the same shared wiring N in the block.
- each rear latch block (CR'CG'CB) performs time-sharing signal transmission to the DAC via the same inter-signal shared wiring CL, reducing the number of wiring between the latter latch block and the DAC. it can.
- the display panel drive circuit of the present invention is suitable for a source driver (particularly, a digital dryer) such as a liquid crystal display device.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
- Liquid Crystal (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200780017449.7A CN101443838B (zh) | 2006-05-24 | 2007-03-20 | 显示面板驱动电路、显示装置 |
EP07739090.4A EP2026321B1 (en) | 2006-05-24 | 2007-03-20 | Display panel drive circuit and display |
JP2008516576A JP5154413B2 (ja) | 2006-05-24 | 2007-03-20 | 表示パネル駆動回路、表示装置 |
US12/227,491 US8471806B2 (en) | 2006-05-24 | 2007-03-20 | Display panel drive circuit and display |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006144713 | 2006-05-24 | ||
JP2006-144713 | 2006-05-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007135805A1 true WO2007135805A1 (ja) | 2007-11-29 |
Family
ID=38723118
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/055647 WO2007135805A1 (ja) | 2006-05-24 | 2007-03-20 | 表示パネル駆動回路、表示装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US8471806B2 (ja) |
EP (1) | EP2026321B1 (ja) |
JP (1) | JP5154413B2 (ja) |
CN (1) | CN101443838B (ja) |
WO (1) | WO2007135805A1 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5439913B2 (ja) | 2009-04-01 | 2014-03-12 | セイコーエプソン株式会社 | 電気光学装置及びその駆動方法、並びに電子機器 |
JP6662402B2 (ja) * | 2018-03-19 | 2020-03-11 | セイコーエプソン株式会社 | 表示ドライバー、電気光学装置及び電子機器 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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EP0606785A1 (fr) | 1992-11-19 | 1994-07-20 | France Telecom | Circuit de commande des colonnes d'un écran d'affichage |
JPH11175042A (ja) * | 1997-10-14 | 1999-07-02 | Lg Semicon Co Ltd | 液晶表示装置の駆動装置 |
JPH11202290A (ja) * | 1998-01-12 | 1999-07-30 | Hitachi Ltd | 液晶表示装置および計算機システム |
US20020167504A1 (en) | 2001-05-09 | 2002-11-14 | Sanyo Electric Co., Ltd. | Driving circuit and display including the driving circuit |
JP2003131625A (ja) * | 2001-10-23 | 2003-05-09 | Sharp Corp | 表示装置の駆動装置及びそれを用いた表示装置モジュール |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US289886A (en) * | 1883-12-11 | Door-hanger | ||
JP2827867B2 (ja) * | 1993-12-27 | 1998-11-25 | 日本電気株式会社 | マトリックス表示装置のデータドライバ |
CN1136529C (zh) * | 1994-05-31 | 2004-01-28 | 夏普株式会社 | 信号放大器和图像显示装置 |
GB2333174A (en) * | 1998-01-09 | 1999-07-14 | Sharp Kk | Data line driver for an active matrix display |
JP3627536B2 (ja) | 1998-10-16 | 2005-03-09 | セイコーエプソン株式会社 | 電気光学装置の駆動回路、電気光学装置およびこれを用いた電子機器 |
US7301520B2 (en) * | 2000-02-22 | 2007-11-27 | Semiconductor Energy Laboratory Co., Ltd. | Image display device and driver circuit therefor |
TW540020B (en) * | 2001-06-06 | 2003-07-01 | Semiconductor Energy Lab | Image display device and driving method thereof |
JP4176385B2 (ja) * | 2001-06-06 | 2008-11-05 | 株式会社半導体エネルギー研究所 | 画像表示装置 |
JP3982249B2 (ja) * | 2001-12-11 | 2007-09-26 | 株式会社日立製作所 | 表示装置 |
JP4550696B2 (ja) * | 2005-08-31 | 2010-09-22 | 株式会社東芝 | 液晶表示制御装置および液晶表示制御方法 |
WO2007135792A1 (ja) | 2006-05-24 | 2007-11-29 | Sharp Kabushiki Kaisha | 表示パネル駆動回路、表示装置 |
-
2007
- 2007-03-20 JP JP2008516576A patent/JP5154413B2/ja not_active Expired - Fee Related
- 2007-03-20 CN CN200780017449.7A patent/CN101443838B/zh not_active Expired - Fee Related
- 2007-03-20 WO PCT/JP2007/055647 patent/WO2007135805A1/ja active Application Filing
- 2007-03-20 EP EP07739090.4A patent/EP2026321B1/en not_active Not-in-force
- 2007-03-20 US US12/227,491 patent/US8471806B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0606785A1 (fr) | 1992-11-19 | 1994-07-20 | France Telecom | Circuit de commande des colonnes d'un écran d'affichage |
JPH11175042A (ja) * | 1997-10-14 | 1999-07-02 | Lg Semicon Co Ltd | 液晶表示装置の駆動装置 |
JPH11202290A (ja) * | 1998-01-12 | 1999-07-30 | Hitachi Ltd | 液晶表示装置および計算機システム |
US20020167504A1 (en) | 2001-05-09 | 2002-11-14 | Sanyo Electric Co., Ltd. | Driving circuit and display including the driving circuit |
JP2003131625A (ja) * | 2001-10-23 | 2003-05-09 | Sharp Corp | 表示装置の駆動装置及びそれを用いた表示装置モジュール |
Also Published As
Publication number | Publication date |
---|---|
EP2026321B1 (en) | 2013-05-15 |
US8471806B2 (en) | 2013-06-25 |
US20090207320A1 (en) | 2009-08-20 |
EP2026321A1 (en) | 2009-02-18 |
CN101443838B (zh) | 2012-11-28 |
JP5154413B2 (ja) | 2013-02-27 |
CN101443838A (zh) | 2009-05-27 |
JPWO2007135805A1 (ja) | 2009-10-01 |
EP2026321A4 (en) | 2009-08-05 |
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