WO2014112459A1 - 表示装置 - Google Patents
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- WO2014112459A1 WO2014112459A1 PCT/JP2014/050412 JP2014050412W WO2014112459A1 WO 2014112459 A1 WO2014112459 A1 WO 2014112459A1 JP 2014050412 W JP2014050412 W JP 2014050412W WO 2014112459 A1 WO2014112459 A1 WO 2014112459A1
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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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1345—Conductors connecting electrodes to cell terminals
- G02F1/13454—Drivers integrated on the active matrix substrate
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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
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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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
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0421—Structural details of the set of electrodes
- G09G2300/0426—Layout of electrodes and connections
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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
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0439—Pixel structures
- G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
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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
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0235—Field-sequential colour display
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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
- 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
Definitions
- the present invention relates to a display device.
- This application claims priority based on Japanese Patent Application No. 2013-007476 filed in Japan on January 18, 2013, the contents of which are incorporated herein by reference.
- a display device such as a liquid crystal display device that includes a data driver IC that supplies video signals to a plurality of data lines constituting a display unit is known.
- a demultiplexer circuit that distributes a video signal output from one terminal of the data driver IC to a plurality of data lines in a time division manner is used.
- Patent Documents 1 and 2 disclose a display device including a demultiplexer circuit.
- Patent Document 2 one input terminal, seven output terminals, connected between the input terminal and each output terminal, and controlled by control signals supplied to three control terminals 12.
- An example of a demultiplexer circuit including a plurality of transistors is disclosed.
- the twelve transistors include two to three transistors arranged in the vertical direction with respect to the same output terminal, or four transistors arranged in the horizontal direction with respect to the same control terminal.
- narrowing the frame portion of the display device is referred to as “narrowing the frame” in the present specification.
- One aspect of the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a display device that can reduce the area occupied by a demultiplexer circuit and reduce the frame.
- M (M: natural number) data lines and N (N: natural number) gate lines intersect each other, and the data lines
- a display unit provided with M ⁇ N dots in a matrix corresponding to the intersection of the gate lines, a data driver for outputting a video signal, and the M data lines from the data driver.
- the second sampling transistor is disposed on a control electrode extending linearly, an input electrode disposed on one of the control electrodes, and on the other of the control electrodes. And an output electrode.
- the first sampling transistor and the second sampling transistor may be arranged at different positions in the extending direction of the data line.
- the first sampling transistor is disposed at a position relatively close to the control line
- the second sampling transistor is disposed at a position relatively far from the control line.
- the output electrode may be disposed between the first branch portion and the second branch portion
- the input electrode may be disposed outside the first branch portion and the second branch portion.
- the second sampling transistor may be composed of a plurality of sampling transistors arranged in the extending direction of the control line.
- the sampling transistors adjacent in the extending direction of the control line may share the input electrode.
- the second sampling transistor may be composed of a plurality of sampling transistors arranged in the extending direction of the data line.
- the first sampling transistor is disposed at a position relatively far from the control line
- the second sampling transistor is disposed at a position relatively close to the control line.
- the input electrode may be disposed between the first branch portion and the second branch portion
- the output electrode may be disposed outside the first branch portion and the second branch portion.
- the second sampling transistor may be composed of a plurality of sampling transistors arranged in the extending direction of the control line.
- the k is 3, the k control lines are a red dot control line, a green dot control line, and a blue dot control line,
- One pixel may be composed of green dots and blue dots.
- the demultiplexer circuit it is possible to reduce the area occupied by the demultiplexer circuit and realize a display device capable of narrowing the frame.
- FIG. 1 is a plan view showing the overall configuration of the display device of the present embodiment.
- FIG. 2 is an equivalent circuit diagram of the demultiplexer circuit.
- FIG. 3 is a plan view showing a pattern of the demultiplexer circuit.
- the scale of the size may be varied depending on the component.
- the liquid crystal display device 1 of this embodiment includes an array substrate 2, a counter substrate 3, and a seal material (not shown) that bonds the array substrate 2 and the counter substrate 3 with a predetermined interval. And a liquid crystal layer (not shown) sealed in a space surrounded by the array substrate 2, the counter substrate 3, and the sealing material.
- the liquid crystal display device 1 includes a backlight, a pair of polarizing plates, and the like as long as it is a transmissive liquid crystal display device.
- the display area 4 includes a plurality of gate lines 5 and a plurality of data lines 6.
- the plurality of gate lines 5 are arranged in parallel to each other and extend in one direction (the x-axis direction in FIG. 1).
- the plurality of data lines 6 are arranged in parallel to each other and extend in a direction (y-axis direction in FIG. 1) orthogonal to the extending direction of the gate line 5.
- a region surrounded by the adjacent gate line 5 and the adjacent data line 6 constitutes a red (R) dot 7R, a green (G) dot 7G, and a blue (B) dot 7B, respectively.
- One pixel 8 is constituted by three dots 7R, 7G, and 7B of R, G, and B.
- TFT Thin Film Transistor
- M (M: natural number) data lines 6 and N (N: natural number) gate lines 5 intersect each other, and the data lines 6 and the gate lines 5 intersect.
- M ⁇ N dots are provided in a matrix. For example, if the number of pixels in the display area 4 is 640 in the horizontal direction and 480 in the vertical direction, the number of data lines 6 is 1920 (640 ⁇ 3), and the number of gate lines 5 is 480.
- the planar shapes of the array substrate 2 and the counter substrate 3 are both rectangular.
- the length of one side of the array substrate 2 (side extending in the y-axis direction) is longer than the length of the corresponding side of the counter substrate 3. Therefore, the upper end of the array substrate 2 protrudes outside the upper end of the counter substrate 3.
- the portion of the array substrate 2 that projects to the outside of the counter substrate 3 is hereinafter referred to as a projecting portion 2h.
- a data driver 10 is mounted on the protruding portion 2 h of the array substrate 2.
- the data driver 10 has a function of supplying a video signal to each data line 6 in the display area 4.
- the data driver 10 is mounted on the array substrate 2 in the form of an IC chip, for example.
- the data driver 10 has a plurality of functional blocks including a shift register and the like, but since this is a well-known configuration, description thereof is omitted.
- a scanning line driving circuit 11 (gate driver) is provided on each of the right side and the left side of the array substrate 2.
- the scanning line driving circuit 11 has a function of supplying a scanning signal to each gate line 5 in the display area 4.
- the odd-numbered gate lines 5 from the top are connected to the scanning line driving circuit 11 on the right side, and the even-numbered gate lines 5 from the top are the scanning line driving circuits on the left side. 11 is connected.
- the scanning line driving circuit 11 includes a plurality of stages of shift registers (not shown), and the shift registers include, for example, TFTs (not shown) formed monolithically on the array substrate.
- the demultiplexer circuit 12 is provided between the plurality of data lines 6 and the data driver 10.
- the demultiplexer circuit 12 has a function of distributing a video signal output from one output terminal of the data driver 10 to a plurality of data lines 6 in a time division manner.
- Video signals are input to the signal input lines Vn and Vn + 1.
- Control signals for controlling the on / off operation of the sampling transistors 13R, 13G, and 13B are input to the control lines BSW, GSW, and RSW.
- the sampling transistors 13R, 13G, and 13B are connected between the signal input lines Vn and Vn + 1 and the data lines SLRn, SLGn, SLBn, SLRn + 1, SLGn + 1, and SLBn + 1.
- FIG. 2 shows only the circuit portions related to the nth signal input line Vn and the (n + 1) th signal input line Vn + 1 out of the m signal input lines of the demultiplexer circuit 12. Further, in order to distinguish the data lines 6, hereinafter, the data lines 6 are denoted by symbols SLRn, SLGn, SLBn, SLRn + 1, SLGn + 1, and SLBn + 1.
- video signals S1, S2, and S3 to be supplied to each of the three data lines SLRn, SLGn, and SLBn are serially input to the signal input line Vn.
- control signals having pulses that rise at different timings and turn on the sampling transistors 13R, 13G, and 13B are input.
- the sampling transistor 13R, the sampling transistor 13G, and the sampling transistor 13B are sequentially turned on, and the video signals S1, S2, and S3 are distributed to the three data lines SLRn, SLGn, and SLBn in a time division manner.
- FIG. 3 shows an example in which the demultiplexer circuit 12 shown in the equivalent circuit diagram of FIG. 2 is realized with an actual pattern.
- the three control lines BSW, GSW, and RSW are arranged in parallel to each other and extend in the x direction.
- the signal input line Vn and the signal input line Vn + 1 are arranged so as to be orthogonal to the control lines BSW, GSW, and RSW. Since the circuit connected to the signal input line Vn and the circuit connected to the signal input line Vn + 1 are the same pattern, the following description will be made representatively using a circuit pattern connected to the signal input line Vn.
- One sampling transistor 13B1, 13R2, 13G2 is connected between each control line BSW, GSW, RSW and each data line SLRn, SLGn, SLBn.
- the “sampling transistor” is simply referred to as “transistor”.
- the transistor can be composed of a thin film transistor (Thin Film Transistor, hereinafter referred to as TFT) monolithically formed on the array substrate 2.
- TFT Thin Film Transistor
- the “control electrode” used in the following description corresponds to the “gate” of the TFT
- the “input electrode” corresponds to the “source” of the TFT
- the “output electrode” corresponds to the “drain” of the TFT.
- the circuit pattern connected to the signal input line Vn has a total of three transistors 13B1, 13R2, and 13G2.
- the three transistors 13B1, 13R2, and 13G2 include a first transistor 13B1 having a branched control electrode and a second transistor 13R2, 13G2 having a linear control electrode.
- the first transistor 13B1 is disposed at a position relatively close to the control lines BSW, GSW, RSW, and the second transistors 13R2, 13G2 are disposed at positions relatively far from the control lines BSW, GSW, RSW.
- the positions of the transistors will be described as the D1 stage and the D2 stage in order from the side closer to the control lines BSW, GSW, RSW to the side farther from them.
- the input electrode 15 is connected to the signal input line Vn through the contact 16.
- the input electrode 15 includes a first branch portion 15a, a second branch portion 15b, and a third branch portion 15c that extend in the formation regions of the transistors 13B1, 13R2, and 13G2, and includes three transistors 13B1, 13R2, and 13G2. Functions as a common input electrode.
- the first blue transistor 13B1 at the D1 stage is connected to a data line SLBn that supplies a video signal to a blue dot.
- the blue first transistor 13B1 includes a control electrode 17 branched into a first branch portion 17a and a second branch portion 17b, and an output electrode 18 disposed between the first branch portion 17a and the second branch portion 17b.
- the first branch portion 15a and the second branch portion 15b of the input electrode 15 disposed outside the first branch portion 17a and the second branch portion 17b, and the semiconductor layer 19 are provided.
- the control electrode 17 is connected to the blue dot control line BSW via the contact 20.
- the semiconductor layer 19 is provided so as to straddle the first branch portion 17 a and the second branch portion 17 b of the control electrode 17.
- the semiconductor layer 19 is connected to the first branch portion 15 a and the second branch portion 15 b of the input electrode 15 through a plurality of contacts 21.
- the semiconductor layer 19 is connected to the output electrode 18 through a plurality of contacts 22.
- the second green transistor 13G2 at the D2 stage is connected to a data line SLGn that supplies a video signal to the green dot.
- the second green transistor 13G2 includes a control electrode 24 extending linearly, an output electrode 25 disposed on one of the control electrodes 24, and a third branch of the input electrode 15 disposed on the other of the control electrodes 24. 15 c and a semiconductor layer 27.
- the control electrode 24 is connected to the green dot control line GSW via the contact 28.
- the semiconductor layer 27 is provided so as to straddle the control electrode 24 and a control electrode 32 of a red second transistor 13R2 described later.
- the semiconductor layer 27 is connected to the third branch portion 15 c of the input electrode 15 through a plurality of contacts 29.
- the semiconductor layer 27 is connected to the output electrode 25 through a plurality of contacts 30.
- the second red transistor 13R2 at the D2 stage is connected to a data line SLRn that supplies a video signal to the red dot.
- the second red transistor 13R2 includes a control electrode 32 extending linearly, an output electrode 33 disposed on one of the control electrodes 32, and a third branch of the input electrode 15 disposed on the other of the control electrodes 32. 15 c and a semiconductor layer 27.
- the control electrode 32 is connected to the red dot control line RSW via the contact 35.
- the semiconductor layer 27 is provided so as to straddle the control electrode 32 and the control electrode 24.
- the semiconductor layer 27 is connected to the output electrode 33 through a plurality of contacts 37.
- the green second transistor 13G2 and the red second transistor 13R2 in the D2 stage are arranged side by side in the extending direction (x direction) of the control lines BSW, GSW, and RSW.
- the second green transistor 13G2 and the second red transistor 13R2 share the input electrode 15 (third branch 15c) and the semiconductor layer 27.
- the second branch portion 15b of the input electrode 15 of the blue first transistor 13B1 and a part of the output electrode 25 of the green second transistor 13G2 extend in the data line extending direction (y direction). It is arranged on a straight line. Accordingly, the occupied portion PB in the x direction of the first blue transistor 13B1 and the occupied portion PG in the x direction of the second green transistor 13G2 partially overlap each other.
- the demultiplexer circuit 101 of the first comparative example has all the transistors 102R, 102G, 102B arranged in a straight line in the extending direction (x direction) of the control lines BSW, GSW, RSW. It is.
- the same components as those in FIG. 3 of this embodiment are denoted by the same reference numerals.
- this arrangement when the overall circuit dimension in the extending direction (x direction) of the control lines BSW, GSW, and RSW becomes extremely large and the pitch between dots (data line pitch) becomes narrow, this arrangement is adopted. It becomes difficult.
- the demultiplexer circuit 201 of the second comparative example is configured by arranging a plurality of transistors 202R, 202G, and 202B in two stages of D1 and D2.
- the same components as those in FIG. 3 of the present embodiment are denoted by the same reference numerals except for the transistors 202R, 202G, and 202B.
- the blue transistor 202B is arranged at the D1 stage, and the green transistor 202G and the red transistor 202R are arranged at the D2 stage.
- the green transistor 202G and the red transistor 202R share the input electrode 203 and the semiconductor layer 204, the blue transistor 202B, the green transistor 202G, and the red transistor 202R all have the same shape and the same dimensions. It is. If the y-direction dimension of each transistor 202R, 202G, 202B is, for example, 100 ⁇ m, the y-direction dimension of the entire demultiplexer circuit 201 is about 200 ⁇ m.
- the control electrode 17 of the blue first transistor 13B1 is branched and arranged on both sides of the first branch portion 17a of the control electrode 17.
- the y-direction dimension of the D1 stage transistor portion is about 50 ⁇ m
- the y-direction dimension of the D2 stage transistor portion is about 100 ⁇ m
- the overall y-direction dimension of the demultiplexer circuit 12 is about 150 ⁇ m. That is, the y-direction dimension of the demultiplexer circuit 12 of this embodiment in FIG. 3 is about 50 ⁇ m shorter than the y-direction dimension of the demultiplexer circuit 201 of the second comparative example in FIG.
- the second red transistor 13R2 having the electrode 32 By combining the second red transistor 13R2 having the electrode 32, the area occupied by the demultiplexer circuit 12 can be reduced, and a narrow frame of the liquid crystal display device 1 can be realized.
- a transistor having a branched control electrode is assigned to a blue transistor, and a transistor having a linear control electrode is assigned to a green transistor and a red transistor.
- a transistor having a branched control electrode may be assigned to any of a blue transistor, a green transistor, and a red transistor. In that case, a transistor having a linear control electrode may be assigned to the remaining transistors.
- FIG. 4 is a plan view showing a pattern of the demultiplexer circuit of this embodiment.
- the same reference numerals are given to the same components as those in FIG. 3 of the first embodiment, and detailed description thereof will be omitted.
- the input electrode 43 is connected to the signal input line Vn through the contact 16.
- the input electrode 43 includes a first branch portion 43a, a second branch portion 43b, and a third branch portion 43c extending in the formation region of the transistors 44B2, 44R2, and 44G1, and includes three transistors 44B2, 44R2, and 44G1. Functions as a common input electrode.
- the transistor having the branched control electrode is arranged at the D1 stage, and the transistor having the linear control electrode is arranged at the D2 stage.
- this embodiment is different from the first embodiment in that a transistor having a linear control electrode is arranged in the D1 stage and a transistor having a branched control electrode is arranged in the D2 stage.
- the second blue transistor 44B2 at the D1 stage is connected to a data line SLBn that supplies a video signal to the blue dot.
- the blue second transistor 44B2 includes a control electrode 45 extending linearly, an output electrode 46 disposed on one side of the control electrode 45, and a first branch portion of the input electrode 43 disposed on the other side of the control electrode 45. 43a and a semiconductor layer 47.
- the control electrode 45 is connected to the blue dot control line BSW via the contact 48.
- the semiconductor layer 47 is connected to the first branch portion 43 a of the input electrode 43 through a plurality of contacts 49.
- the semiconductor layer 47 is connected to the output electrode 46 through a plurality of contacts 50.
- the second red transistor 44R2 at the D1 stage is connected to a data line SLRn that supplies a video signal to the red dot.
- the second red transistor 44R2 includes a control electrode 52 extending linearly, an output electrode 53 disposed on one of the control electrodes 52, and a third branch of the input electrode 43 disposed on the other of the control electrodes 52. 43c and a semiconductor layer 54.
- the control electrode 52 is connected to the red dot control line RSW via the contact 55.
- the semiconductor layer 54 is connected to the third branch portion 43 c of the input electrode 43 through a plurality of contacts 56.
- the semiconductor layer 54 is connected to the output electrode 53 via a plurality of contacts 57.
- the first green transistor 44G1 in the D2 stage is connected to a data line SLGn that supplies a video signal to the green dot.
- the first green transistor 44G1 includes a control electrode 59 branched into a first branch part 59a and a second branch part 59b, and an input electrode 43 disposed between the first branch part 59a and the second branch part 59b.
- a second branch part 43b, an output electrode 60 disposed outside the first branch part 59a and the second branch part 59b, and a semiconductor layer 61 are provided.
- the control electrode 59 is connected to the green dot control line GSW via the contact 62.
- the semiconductor layer 61 is provided so as to straddle the first branch portion 59a and the second branch portion 59b of the control electrode 59.
- the semiconductor layer 61 is connected to the second branch portion 43 b of the input electrode 43 through a plurality of contacts 63.
- the semiconductor layer 61 is connected to the output electrode 60 through a plurality of contacts 64.
- the D2-stage blue second transistor 44B2 and the red second transistor 44R2 are arranged side by side in the extending direction (x direction) of the control lines BSW, GSW, and RSW.
- the occupied portion PB in the x direction of the second blue transistor 44B2 and the occupied portion PG in the x direction of the first green transistor 44G1 partially overlap each other.
- the occupied portion PR in the x direction of the red second transistor 44R2 and the occupied portion PG in the x direction of the first transistor for green 44G1 partially overlap each other.
- the first green transistor 44G1 having the branched control electrode 59, the second blue transistor 44B2 having the linear control electrode 45, and the linear control electrode 52 are included.
- the second red transistor 44R2 the area occupied by the demultiplexer circuit 42 can be reduced, and a narrow frame of the liquid crystal display device can be realized.
- a transistor having a branched control electrode is assigned to a green transistor, and a transistor having a linear control electrode is assigned to a blue transistor and a red transistor.
- a transistor having a branched control electrode may be assigned to any of a blue transistor, a green transistor, and a red transistor. In that case, a transistor having a linear control electrode may be assigned to the remaining transistors.
- FIG. 5 is a plan view showing a pattern of the demultiplexer circuit of the present embodiment.
- symbol is attached
- the input electrode 73 is connected to the signal input line Vn via the contact 16.
- the input electrode 73 includes a first branch portion 73a and a second branch portion 73b extending in the formation region of the transistors 74B1, 74G2, and 74R2, and functions as an input electrode shared by the three transistors 74B1, 74G2, and 74R2. To do.
- the transistor having the branched control electrode and the transistor having the linear control electrode are arranged in the D1 stage and the D2 stage.
- this embodiment is different from the first and second embodiments in that three transistors 74B1, 74G2, and 74R2 are arranged in three stages.
- the positions of the transistors will be described as the D1 stage, the D2 stage, and the D3 stage in order from the side closer to the control lines BSW, GSW, and RSW to the side farther from the side.
- the first blue transistor 74B1 in the D1 stage is connected to a data line SLBn that supplies a video signal to a blue dot.
- the blue first transistor 74B1 includes a control electrode 75 branched into a first branch part 75a and a second branch part 75b, and an output electrode 76 disposed between the first branch part 75a and the second branch part 75b.
- An input electrode 73 disposed outside the first branch portion 75a and the second branch portion 75b, and a semiconductor layer 77.
- the control electrode 75 is connected to the blue dot control line BSW via a contact 78.
- the semiconductor layer 77 is provided so as to straddle the first branch portion 75a and the second branch portion 75b of the control electrode 75.
- the semiconductor layer 77 is connected to the first branch part 73 a and the second branch part 73 b of the input electrode 73 through a plurality of contacts 79.
- the semiconductor layer 77 is connected to the output electrode 76 via a plurality of contacts 80.
- the second green transistor 74G2 in the D2 stage is connected to a data line SLGn that supplies a video signal to the green dot.
- the second green transistor 74G2 includes a control electrode 82 extending linearly, an output electrode 83 disposed on one of the control electrodes 82, and a second branch portion of the input electrode 73 disposed on the other of the control electrodes 82. 73b and a semiconductor layer 84.
- the control electrode 82 is connected to the green dot control line GSW via the contact 85.
- the semiconductor layer 84 is connected to the second branch portion 73 b of the input electrode 73 through a plurality of contacts 86.
- the semiconductor layer 84 is connected to the output electrode 83 through a plurality of contacts 87.
- the second red transistor 74R2 at the D3 stage is connected to a data line SLRn that supplies a video signal to the red dot.
- the second red transistor 74R2 includes a control electrode 89 extending linearly, an output electrode 90 disposed on one of the control electrodes 89, and a second branch of the input electrode 73 disposed on the other of the control electrodes 89. 73b and a semiconductor layer 91.
- the control electrode 89 is connected to the red dot control line RSW via the contact 92.
- the semiconductor layer 91 is connected to the second branch portion 73 b of the input electrode 73 through a plurality of contacts 93.
- the semiconductor layer 91 is connected to the output electrode 90 through a plurality of contacts 94.
- the D2-stage green second transistor 74G2 and the D3-stage red second transistor 74R2 are arranged side by side in the data line extending direction (y direction).
- a second branch 73b serving as an input electrode common to the three transistors 74B1, 74G2, and 74R2 extends linearly.
- a part of the output electrode 76 of the blue first transistor 74B1, a part of the output electrode 83 of the green second transistor 74G2, and a part of the output electrode 90 of the red second transistor 74R2 are extending directions of the data lines. They are arranged on the same straight line extending in parallel with the (y direction). Therefore, the connection portion between each output electrode 76, 83, 90 and each data line has a shape bent so as not to contact each other.
- the occupied portion PG in the x direction of the second green transistor 74G2 and the occupied portion PR in the x direction of the second red transistor 74R2 are almost completely overlapped.
- the occupied portion PB of the blue first transistor 74B1 in the x direction partially overlaps the occupied portion PG of the green second transistor 74G2 in the x direction and the occupied portion PR of the red second transistor 74R2 in the x direction. .
- the first blue transistor 74B1 having the branched control electrode 75, the second green transistor 74G2 having the linear control electrode 82, and the linear control electrode 89 are included.
- the second red transistor 74R2 the area occupied by the demultiplexer circuit 72 can be reduced, and a narrow frame of the liquid crystal display device can be realized.
- the demultiplexer circuit 72 of this embodiment since the three transistors 74B1, 74G2, and 74R2 are arranged in three stages, the dimension in the y direction is larger than that of the demultiplexer circuits of the first and second embodiments. However, since the overlapping of the occupied portions PB, PG, and PR in the x direction of the transistors 74B1, 74G2, and 74R2 is larger than in the first and second embodiments, the overall x direction dimension of the demultiplexer circuit 72 is the first, Compared to the second embodiment. Therefore, the demultiplexer circuit 72 of the present embodiment can be suitably applied to a liquid crystal display device in which the pitch of data lines is narrow.
- the transistor having the branched control electrode is assigned to the D1 blue transistor, and the transistor having the linear control electrode is assigned to the D2 green transistor and the D3 red transistor.
- the shape and arrangement of the transistors are not limited to this, and can be changed as appropriate.
- FIG. 6 is a plan view showing a pattern of the demultiplexer circuit of the present embodiment.
- the same components as those in FIG. 3 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
- each of the second green transistor and the second red transistor is composed of one transistor having a long dimension in the y direction.
- each of the second green transistor and the second red transistor is composed of two transistors divided in the y direction.
- the second green transistor at the D2 stage includes a transistor 13G2-1 having a semiconductor layer 27A, a transistor 13G2-2 having a semiconductor layer 27B, Are arranged in the y direction.
- the second red transistor at the D2 stage has a configuration in which a transistor 13R2-1 having a semiconductor layer 27A and a transistor 13R2-2 having a semiconductor layer 27B are arranged in the y direction.
- the transistor 13G2-1 and the transistor 13R2-1 share one semiconductor layer 27A.
- the transistor 13G2-2 and the transistor 13R2-2 share one semiconductor layer 27B.
- the configuration of the control electrode, output electrode, input electrode, and the like of each transistor is the same as in the first embodiment.
- the second transistors 13R2-1 and 13R2-2 for red having the control electrode 32 the area occupied by the demultiplexer circuit 66 is reduced and the frame of the liquid crystal display device is reduced as in the first embodiment. can do.
- the green second transistor and the red second transistor in the D2 stage are configured by two divided transistors, but the number of divided transistors is not limited to two.
- the transistor is designed in such a manner that the input electrode or the output electrode and the semiconductor layer are connected using six contacts.
- the design is not limited to this form, and the design can be changed as appropriate.
- the wiring can be appropriately changed.
- one pixel is composed of four color dots without being limited to a configuration in which a video signal is distributed from one signal input line to three data lines, four data lines are formed from one signal input line.
- the video signal may be distributed to each other.
- the first transistor the example in which the front end side of the control electrode branches into two and has the first branch part and the second branch part is shown, but the number of the control electrode branch parts is limited to two. Instead, the control electrode may have three or more branches.
- the display device of the present invention is not limited to a liquid crystal display device, and can be applied to various display devices including a demultiplexer circuit.
- the display device of the present invention may be an electronic paper using microcapsules enclosing white charged particles and black charged particles.
- the display device of the present invention may be an organic electroluminescence display device that uses an organic light-emitting layer that emits light by charge injection as a display medium.
- the present invention can be used for various display devices such as liquid crystal display devices, electronic paper, and organic electroluminescence display devices.
- SYMBOLS 1 Liquid crystal display device (display apparatus), 4 ... Display area
- first branch 17b, 59b, 75b ... second Branch, 18, 25, 33, 46, 53, 60, 76, 83, 90 ... output electrode, Vn, Vn + 1 ... signal input line, BSW, GSW, RSW ... control , SLRn, SLGn, SLBn, SLRn + 1, SLGn + 1, SLBn + 1 ... data line.
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Abstract
Description
本願は、2013年1月18日に、日本に出願された特願2013-007476号に基づき優先権を主張し、その内容をここに援用する。
以下、本発明の第1実施形態について、図1~図3を用いて説明する。
本実施形態では、表示装置として液晶表示装置の一例を挙げて説明する。
図1は、本実施形態の表示装置の全体構成を示す平面図である。図2は、デマルチプレクサ回路の等価回路図である。図3は、デマルチプレクサ回路のパターンを示す平面図である。
なお、以下の各図面においては各構成要素を見やすくするため、構成要素によって寸法の縮尺を異ならせて示すことがある。
R,G,Bの3つのドット7R,7G,7Bで1つの画素8が構成される。ゲート5線とデータ線6との交差点の近傍に、画素スイッチング用の薄膜トランジスタ(Thin Film Transistor, 以下、TFTと略記する、図示略)が備えられている。画素電極(図示略)は、TFTを介してゲート線5およびデータ線6に接続されている。表示領域4は、特許請求の範囲の「表示部」に相当する。
図3に示すように、3本の制御線BSW,GSW,RSWは、互いに平行に配置され、x方向に延在している。信号入力線Vn、信号入力線Vn+1は、制御線BSW,GSW,RSWと直交するように配置されている。
信号入力線Vnに接続される回路と信号入力線Vn+1に接続される回路とは同じパターンの繰り返しであるため、以下、信号入力線Vnに接続される回路パターンで代表して説明する。各制御線BSW,GSW,RSWと各データ線SLRn、SLGn、SLBnとの間には1個のサンプリング用トランジスタ13B1,13R2,13G2が接続されている。
図7に示すように、第1比較例のデマルチプレクサ回路101は、全てのトランジスタ102R,102G,102Bを制御線BSW,GSW,RSWの延在方向(x方向)に直線状に並べて配置したものである。図7において、トランジスタ102R,102G,102Bを除いて、本実施形態の図3と共通の構成要素には同一の符号を付す。この配置では、制御線BSW,GSW,RSWの延在方向(x方向)の回路全体の寸法が極めて大きくなり、ドット間のピッチ(データ線のピッチ)が狭くなった場合、この配置を採用することが難しくなる。
図8に示すように、第2比較例のデマルチプレクサ回路201は、複数のトランジスタ202R,202G,202BをD1段目、D2段目の2段に分けて配置したものである。図8において、トランジスタ202R,202G,202Bを除いて、本実施形態の図3と共通の構成要素には同一の符号を付す。この例では、青色用トランジスタ202BがD1段目に配置され、緑色用トランジスタ202Gおよび赤色用トランジスタ202RはD2段目に配置されている。緑色用トランジスタ202Gと赤色用トランジスタ202Rとは入力電極203と半導体層204とを共用しているものの、青色用トランジスタ202B、緑色用トランジスタ202Gおよび赤色用トランジスタ202Rは、全て同じ形状であり、同じ寸法である。各トランジスタ202R,202G,202Bのy方向寸法を例えば100μmとすると、デマルチプレクサ回路201全体のy方向寸法は200μm程度となる。
以下、本発明の第2実施形態について、図4を参照して説明する。
本実施形態の液晶表示装置の基本構成は第1実施形態と同様であり、デマルチプレクサ回路のトランジスタ構成が第1実施形態と異なる。
図4は、本実施形態のデマルチプレクサ回路のパターンを示す平面図である。
図4において、第1実施形態の図3と共通の構成要素には同一の符号を付し、詳細な説明を省略する。
以下、本発明の第3実施形態について、図5を参照して説明する。
本実施形態の液晶表示装置の基本構成は第1実施形態と同様であり、デマルチプレクサ回路のトランジスタ構成が第1実施形態と異なる。
図5は、本実施形態のデマルチプレクサ回路のパターンを示す平面図である。
図5において、第1実施形態の図3と共通の構成要素には同一の符号を付し、詳細な説明を省略する。
したがって、各出力電極76,83,90と各データ線との接続部分は、互いに接触しないように折り曲げられた形状を有している。
以下、本発明の第4実施形態について、図6を参照して説明する。
本実施形態の液晶表示装置の基本構成は第1実施形態と同様であり、デマルチプレクサ回路のトランジスタ構成が第1実施形態と異なる。
図6は、本実施形態のデマルチプレクサ回路のパターンを示す平面図である。
図6において、第1実施形態の図3と共通の構成要素には同一の符号を付し、詳細な説明を省略する。
本実施形態では、D2段目の緑色用第2トランジスタおよび赤色用第2トランジスタを、分割された2個のトランジスタで構成したが、トランジスタの分割数は2個に限るものではない。
例えば上記実施形態では、6個のコンタクトを用いて入力電極もしくは出力電極と半導体層とを接続する形態でトランジスタを設計したが、特にこの形態に限ることなく、設計変更は適宜可能である。また、各配線の引き回しについても適宜変更が可能である。1本の信号入力線から3本のデータ線にビデオ信号を分配する構成に限ることなく、例えば4色のドットで一つの画素を構成する場合、1本の信号入力線から4本のデータ線にビデオ信号を分配する構成としてもよい。
また、第1トランジスタとして、制御電極の先端側が2本に分岐し、第1枝部と第2枝部とを有するトランジスタの例を示したが、制御電極の枝部の本数は2本に限ることなく、制御電極は3本以上の枝部を有していてもよい。
Claims (10)
- M(M:自然数)本のデータ線とN(N:自然数)本のゲート線とが互いに交差し、前記データ線と前記ゲート線との交差に対応してM×N個のドットがマトリクス状に設けられた表示部と、
ビデオ信号を出力するデータドライバと、
前記M本のデータ線に対して前記データドライバから出力されたビデオ信号を時分割で分配するデマルチプレクサ回路と、
前記N本のゲート線に走査信号を出力するゲートドライバと、を備え、
前記デマルチプレクサ回路は、前記ビデオ信号が入力されるm(m:自然数、m<M)本の信号入力線と、制御信号が入力されるk(k:自然数、k=M/m)本の制御線と、前記信号入力線と前記データ線との間に接続されたM個のサンプリング用トランジスタと、を備え、
1本の前記信号入力線に接続されたk個の前記サンプリング用トランジスタが、第1サンプリング用トランジスタと第2サンプリング用トランジスタとを含み、
前記第1サンプリング用トランジスタは、第1枝部と第2枝部とを有する制御電極と、前記第1枝部と前記第2枝部との間に配置された入力電極、出力電極のいずれか一方と、前記第1枝部と前記第2枝部との外側に配置された入力電極、出力電極のいずれか他方と、を備え、
前記入力電極が前記信号入力線に接続され、前記出力電極が前記データ線に接続される表示装置。 - 前記第2サンプリング用トランジスタは、直線状に延在する制御電極と、前記制御電極の一方に配置された入力電極と、前記ゲートの他方に配置された出力電極と、を備える請求項1に記載の表示装置。
- 前記第1サンプリング用トランジスタと前記第2サンプリング用トランジスタとが、前記データ線の延在方向において異なる位置に配置される請求項2に記載の表示装置。
- 前記第1サンプリング用トランジスタが前記制御線に相対的に近い位置に配置され、前記第2サンプリング用トランジスタが前記制御線から相対的に遠い位置に配置され、
前記出力電極が前記第1枝部と前記第2枝部との間に配置され、前記入力電極が前記第1枝部と前記第2枝部との外側に配置される請求項3に記載の表示装置。 - 前記第2サンプリング用トランジスタが、前記制御線の延在方向に配置された複数のサンプリング用トランジスタで構成される請求項4に記載の表示装置。
- 前記制御線の延在方向に隣り合うサンプリング用トランジスタが、前記入力電極を共有する請求項5に記載の表示装置。
- 前記第2サンプリング用トランジスタが、前記データ線の延在方向に配置された複数のサンプリング用トランジスタで構成される請求項4に記載の表示装置。
- 前記第1サンプリング用トランジスタが前記制御線から相対的に遠い位置に配置され、前記第2サンプリング用トランジスタが前記制御線に相対的に近い位置に配置され、
前記入力電極が前記第1枝部と前記第2枝部との間に配置され、前記出力電極が前記第1枝部と前記第2枝部との外側に配置される請求項3に記載の表示装置。 - 前記第2サンプリング用トランジスタが、前記制御線の延在方向に配置された複数のサンプリング用トランジスタで構成される請求項8に記載の表示装置。
- 前記kが3であり、
前記k本の制御線が、赤色ドット用制御線、緑色ドット用制御線、および青色ドット用制御線であり、
赤色ドットと緑色ドットと青色ドットとにより一つの画素が構成される請求項1から請求項9までのいずれか一項に記載の表示装置。
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JP2019008150A (ja) * | 2017-06-26 | 2019-01-17 | セイコーエプソン株式会社 | 電気光学装置及び電子機器 |
US11355525B2 (en) | 2020-07-10 | 2022-06-07 | Sharp Kabushiki Kaisha | Active matrix substrate and display device including the same |
US11532647B2 (en) | 2020-07-10 | 2022-12-20 | Sharp Kabushiki Kaisha | Active matrix substrate and display device including the same |
JP7438044B2 (ja) | 2020-07-10 | 2024-02-26 | シャープ株式会社 | アクティブマトリクス基板およびこれを備える表示装置 |
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CN104956427B (zh) | 2017-07-07 |
JPWO2014112459A1 (ja) | 2017-01-19 |
US9842559B2 (en) | 2017-12-12 |
CN104956427A (zh) | 2015-09-30 |
US20150356940A1 (en) | 2015-12-10 |
JP6005184B2 (ja) | 2016-10-12 |
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