WO2007111044A1 - 液晶表示装置 - Google Patents
液晶表示装置 Download PDFInfo
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- WO2007111044A1 WO2007111044A1 PCT/JP2007/051983 JP2007051983W WO2007111044A1 WO 2007111044 A1 WO2007111044 A1 WO 2007111044A1 JP 2007051983 W JP2007051983 W JP 2007051983W WO 2007111044 A1 WO2007111044 A1 WO 2007111044A1
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- Prior art keywords
- electrode
- liquid crystal
- auxiliary
- auxiliary capacitance
- insulating film
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Classifications
-
- 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
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136213—Storage capacitors associated with the pixel electrode
-
- 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 at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- 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 at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—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 at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1255—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 at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs integrated with passive devices, e.g. auxiliary capacitors
-
- 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
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136227—Through-hole connection of the pixel electrode to the active element through an insulation layer
-
- 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
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
- G02F1/13685—Top gates
Definitions
- the present invention relates to a liquid crystal display device, and more particularly to an active matrix type liquid crystal display device in which an auxiliary capacitor is provided for each pixel.
- Liquid crystal display devices are characterized by being thin and have low power consumption, and are widely used in various fields.
- an active matrix liquid crystal display device including a thin film transistor (referred to as “TFT”) for each pixel has a high contrast ratio, excellent response characteristics, and high performance. It is used for notebook computers, and the scale of the plant has been expanding in recent years.
- TFT thin film transistor
- a general active matrix liquid crystal display device an auxiliary capacitor is provided for each pixel in order to suitably hold a voltage applied to a liquid crystal layer for a predetermined time (for example, Patent Document 1). reference).
- Fig. 6 shows an example of a conventional active matrix liquid crystal display device having an auxiliary capacitor.
- a liquid crystal display device 500 shown in FIG. 6 has a plurality of pixels arranged in a matrix.
- Each pixel is provided with a liquid crystal capacitor Clc and an auxiliary capacitor Cs electrically connected in parallel to the liquid crystal capacitor Clc.
- the liquid crystal capacitance Clc includes a pixel electrode 512 switched by the thin film transistor 511, a counter electrode 513 facing the pixel electrode 512, and a liquid crystal layer 514 disposed between the pixel electrode 512 and the counter electrode 513. Is formed.
- the thin film transistor 511 is supplied with a scanning signal from the scanning wiring 515 and supplied with a display signal from the signal wiring 516.
- the auxiliary capacitance Cs includes an auxiliary capacitance electrode 517 that is electrically connected to the pixel electrode 512, an auxiliary capacitance counter electrode 518 that faces the auxiliary capacitance electrode 517, an auxiliary capacitance electrode 517, and an auxiliary capacitance counter electrode 518. And a dielectric layer 519 disposed therebetween.
- the auxiliary capacity counter electrode 518 is electrically connected to the auxiliary capacity wiring 529 and supplied with a predetermined voltage from the auxiliary capacity wiring 529.
- 7 and 8 show the structure of the active matrix substrate 500a included in the liquid crystal display device 500.
- FIG. FIG. 7 is a plan view schematically showing the active matrix substrate 500a
- FIG. 8 is a cross-sectional view taken along line 8A-8A ′ in FIG. 7 and 8 illustrate a top gate type thin film transistor 511 as an example.
- the active matrix substrate 500a has a structure in which a plurality of conductive layers and insulating layers are stacked on a transparent insulating substrate (for example, a glass substrate) 510.
- a transparent insulating substrate for example, a glass substrate
- the semiconductor layer 522 and the auxiliary capacitor electrode 517 of the thin film transistor 511 are provided over the insulating substrate 510, and the gate insulating film 519 is provided so as to cover them.
- a portion of the gate insulating film 519 located on the auxiliary capacitance electrode 517 functions as a dielectric layer for the auxiliary capacitance Cs.
- a scanning wiring 515, a gate electrode 515a extending from the scanning wiring 515, an auxiliary capacitance wiring 529, and an auxiliary capacitance counter electrode 518 are provided on the gate insulating film 519.
- a portion of the auxiliary capacitance wiring 529 located in the pixel functions as the auxiliary capacitance counter electrode 518.
- An interlayer insulating film 523 is formed so as to cover the scanning wiring 515, the gate electrode 515a, the auxiliary capacitance wiring 529, and the auxiliary capacitance counter electrode 518, and the signal wiring 516 is formed on the interlayer insulating film 523. Is provided.
- the signal wiring 516 is connected to the semiconductor layer 522 through a contact hole 524 formed in the interlayer insulating film 523 and the gate insulating film 519.
- a transparent resin film 526 is formed so as to cover the signal wiring 516, and a pixel electrode 512 is provided on the resin film 526.
- the pixel electrode 512 is electrically connected to the semiconductor layer 522 through a connection electrode 530 formed of the same conductive film as the signal wiring 516.
- the connection electrode 530 is connected to the semiconductor layer 522 at the contact hole 525 formed in the interlayer insulating film 523 and the gate insulating film 519, and is connected to the pixel electrode 512 in the contact hole 527 formed in the interlayer insulating film 523. It is connected.
- the liquid crystal display device 500 has the auxiliary capacitor Cs electrically connected in parallel to the liquid crystal capacitor Clc as described above, the voltage applied to the liquid crystal layer 514 is preferably applied for a predetermined time. Can be held, and high-quality display can be performed. In order to maintain the applied voltage for a long time, the capacitance value of the auxiliary capacitor Cs is preferably large.
- Patent Document 1 Japanese Patent Laid-Open No. 2002-05565656
- the auxiliary capacitor Cs is a light shielding member (in the illustrated configuration, the auxiliary capacitor counter electrode).
- the aperture ratio decreases.
- the capacitance value of the auxiliary capacitor and the aperture ratio are in a trade-off relationship, and it is difficult to realize both a high aperture ratio and a large capacitance value.
- high definition of liquid crystal display devices has progressed, and a decrease in aperture ratio due to the area occupied by the auxiliary capacitor is a serious problem.
- the present invention has been made in view of the above problems, and an object thereof is to have a high aperture ratio.
- Another object of the present invention is to provide an active matrix liquid crystal display device provided with an auxiliary capacity having a sufficiently large capacity value.
- the liquid crystal display device is a liquid crystal display device having a plurality of pixels arranged in a matrix, and each of the plurality of pixels is a pixel electrode that is switched by a top-gate thin film transistor.
- a liquid crystal capacitor formed by a counter electrode facing the pixel electrode, a liquid crystal layer disposed between the pixel electrode and the counter electrode, and a first auxiliary capacitor electrically connected in parallel to the liquid crystal capacitor And the second auxiliary capacitance, wherein the first auxiliary capacitance is a first auxiliary capacitance electrode electrically connected to the pixel electrode, and a first auxiliary capacitance opposed to the first auxiliary capacitance electrode An electrode, and a first dielectric layer disposed between the first auxiliary capacitance electrode and the first auxiliary capacitance counter electrode, and the second auxiliary capacitance is electrically connected to the pixel electrode.
- the first auxiliary capacitor counter electrode and the second auxiliary capacitor counter electrode are a single electrode common to the first auxiliary capacitor and the second auxiliary capacitor, and
- the dielectric layer is a part of a gate insulating film that covers the semiconductor layer of the thin film transistor, and the second dielectric layer is an interlayer insulating film that covers a scanning wiring that supplies a scanning signal to the thin film transistor. A part of the film that is selectively thinned so as to be thinner than the other part of the interlayer insulating film, thereby achieving the above object.
- the first auxiliary capacitance electrode is formed of the same semiconductor film as the semiconductor layer of the thin film transistor.
- the second auxiliary capacitance electrode is formed of the same conductive film as a signal wiring that supplies a display signal to the thin film transistor.
- the liquid crystal display device further includes a resin film covering the signal line and the second auxiliary capacitance electrode, and the resin film is formed on the resin film.
- the pixel electrode is formed.
- the interlayer insulating film is a multilayer insulating film in which a first layer and a second layer having different insulating material forces are laminated, and the multilayer insulating film is
- the second dielectric layer of the second storage capacitor is the low lamination region of the multilayer insulating film, and has a low lamination region where the second layer is selectively removed.
- the liquid crystal display device is an active matrix type liquid crystal display device driven by a top gate type thin film transistor, and two auxiliary capacitors electrically connected to the liquid crystal capacitor in parallel for each pixel.
- Each auxiliary capacitor includes an auxiliary capacitor electrode electrically connected to the pixel electrode, an auxiliary capacitor counter electrode opposed to the auxiliary capacitor electrode, and a dielectric disposed between the auxiliary capacitor electrode and the auxiliary capacitor counter electrode.
- the auxiliary capacitor counter electrodes of the two auxiliary capacitors are a single electrode common to both auxiliary capacitors.
- the two auxiliary capacitors are provided so as to overlap each other. For this reason, the value of the auxiliary capacity can be increased without increasing the area occupied by the auxiliary capacity.
- the dielectric layer of one auxiliary capacitor (the first dielectric layer of the first auxiliary capacitor) is a part of the gate insulating film covering the semiconductor layer of the thin film transistor, whereas the other auxiliary capacitor
- the dielectric layer (second dielectric layer of the second auxiliary capacitor) is a part of the interlayer insulating film covering the scanning wiring, and is selectively thinned so as to be thinner than other parts of the interlayer insulating film. The part The Therefore, in the liquid crystal display device according to the present invention, the capacitance value of the second auxiliary capacitor can be increased without increasing the parasitic capacitance formed between the wirings facing each other through the interlayer insulating film. High-definition display can be realized.
- FIG. 1 is an equivalent circuit diagram schematically showing a liquid crystal display device 100 in a preferred embodiment of the present invention.
- FIG. 2 is a plan view schematically showing an active matrix substrate 100a of the liquid crystal display device 100.
- FIG. 2 is a plan view schematically showing an active matrix substrate 100a of the liquid crystal display device 100.
- FIG. 3 (a) and (b) are cross-sectional views schematically showing the active matrix substrate 100a of the liquid crystal display device 100, and (a) is a cross-section taken along the line 3A-3A ′ in FIG. (B) shows a cross section along the line 3B-3B 'in Fig. 2! /.
- FIG. 4 is a diagram for explaining a method of selectively thinning a part of the interlayer insulating film 23 of the active matrix substrate 100a.
- FIG. 5 is a cross-sectional view schematically showing an active matrix substrate 100a having an interlayer insulating film 23 having a multilayer structure.
- FIG. 6 is an equivalent circuit diagram schematically showing a conventional liquid crystal display device 500 having an auxiliary capacity.
- FIG. 7 is a plan view schematically showing an active matrix substrate 500a of a liquid crystal display device 500.
- FIG. 8 is a cross-sectional view schematically showing an active matrix substrate 500a of the liquid crystal display device 500, and shows a cross section taken along the line 8A-8A ′ in FIG.
- Second dielectric layer (thinned part of interlayer insulating film)
- FIG. 1 schematically shows an equivalent circuit of the liquid crystal display device 100 according to the present embodiment.
- the liquid crystal display device 100 has a plurality of pixels arranged in a matrix. Each pixel is provided with a liquid crystal capacitor Clc, and a first auxiliary capacitor Csl and a second auxiliary capacitor Cs2 electrically connected in parallel to the liquid crystal capacitor Clc.
- the liquid crystal capacitance Clc includes a pixel electrode 12 that is switched by the thin film transistor 11, and a pixel.
- the counter electrode 13 is opposed to the element electrode 12 and the liquid crystal layer 14 is disposed between the pixel electrode 12 and the counter electrode 13.
- the thin film transistor 11 is supplied with a scanning signal from the scanning wiring 15 and supplied with a display signal from the signal wiring 16.
- the thin film transistor 11 is a top gate type as will be described in detail later.
- the first auxiliary capacitance Csl includes a first auxiliary capacitance electrode 17 electrically connected to the pixel electrode 12, a first auxiliary capacitance counter electrode 18a facing the first auxiliary capacitance electrode 17, and a first auxiliary capacitance
- the first dielectric layer 19 is disposed between the electrode 17 and the first auxiliary capacitance counter electrode 18a.
- the second auxiliary capacitance Cs2 includes a second auxiliary capacitance electrode 20 electrically connected to the pixel electrode 12, a second auxiliary capacitance counter electrode 18b facing the second auxiliary capacitance electrode 20, and a second auxiliary capacitance Cs2.
- the second dielectric layer 21 is disposed between the auxiliary capacitance electrode 20 and the second auxiliary capacitance counter electrode 18b.
- the first auxiliary capacitor counter electrode 18 a and the second auxiliary capacitor counter electrode 18 b are electrically connected to the auxiliary capacitor line 29 and supplied with a predetermined voltage from the auxiliary capacitor line 29.
- the first auxiliary capacitor counter electrode 18a and the second auxiliary capacitor counter electrode 18b are illustrated separately. However, in the liquid crystal display device 100 according to the present embodiment, the first auxiliary capacitor counter electrode 18a and the second auxiliary capacitor counter electrode 18b are illustrated.
- the auxiliary capacitance counter electrode 18a and the second auxiliary capacitance counter electrode 18b are a single electrode common to the first auxiliary capacitance Csl and the second auxiliary capacitance Cs2. Hereinafter, this common electrode is also referred to as “common auxiliary capacitor counter electrode”.
- the first dielectric layer 19 of the first auxiliary capacitor Csl is a part of the gate insulating film that covers the semiconductor layer of the thin film transistor 11.
- the second dielectric layer 21 of the second auxiliary capacitor Cs2 is specifically a part of an interlayer insulating film covering the scanning wiring 15, and more specifically so as to be thinner than other parts. This is a portion that is selectively thinned.
- FIG. 2 is a plan view schematically showing the structure of the active matrix substrate 100a of the liquid crystal display device 100.
- FIG. 3 (a) is a cross-sectional view taken along line 3A-3A 'in FIG. 2
- FIG. 3 (b) is a cross-sectional view taken along line 3B-3B' in FIG.
- the active matrix substrate 100a is formed on a transparent insulating substrate (for example, a glass substrate) 10. It has a structure in which a plurality of conductive layers and insulating layers are stacked. Specifically, first, the semiconductor layer (for example, n + -Si layer) 22 and the first auxiliary capacitance electrode 17 are provided on the insulating substrate 10, and the gate insulating film 19 is provided so as to cover them. It has been. A portion of the gate insulating film 19 located on the first auxiliary capacitance electrode 17 functions as the first dielectric layer 19 of the first auxiliary capacitance Csl.
- the first auxiliary capacitance electrode 17 is formed of the same semiconductor film as the semiconductor layer 22 of the thin film transistor 11. Further, the first auxiliary capacitance electrode 17 extends from the semiconductor layer 22 so as to be inferred from FIG. 2, and is electrically connected to the pixel electrode 12 through the semiconductor layer 22.
- a scanning wiring 15, a gate electrode 15a extending from the scanning wiring 15, an auxiliary capacitance wiring 29, and a common auxiliary capacitance counter electrode 18 are provided on the gate insulating film 19. These are formed from the same conductive film. As can be seen from FIG. 2, the portion of the auxiliary capacitance wiring 29 located in the pixel functions as the common auxiliary capacitance counter electrode 18.
- An interlayer insulating film 23 is formed so as to cover the scanning wiring 15, the gate electrode 15 a, the auxiliary capacitance wiring 29, and the common auxiliary capacitance counter electrode 18 described above. As shown in FIG. 3 (b), the interlayer insulating film 23 has a portion 21 which is selectively thinned so as to be thinner than other portions on the common auxiliary capacitance counter electrode 18, and this portion 21 functions as the second dielectric layer 21 of the second auxiliary capacitor Cs2.
- a signal wiring 16 is provided on the interlayer insulating film 23.
- the signal wiring 16 is connected to the semiconductor layer 22 through a contact hole 24 formed in the interlayer insulating film 23 and the gate insulating film 19.
- a second auxiliary capacitance electrode 20 is provided on the thin film portion (that is, the second dielectric layer constituting the second auxiliary capacitance Cs2) 21 of the interlayer insulating film 23.
- the second auxiliary capacitance electrode 20 is formed of the same conductive film as the signal wiring 16.
- the second auxiliary capacitance electrode 20 is connected to the semiconductor layer 22 through a contact hole 25 formed on the gate insulating film 19 and the interlayer insulating film 23 on the semiconductor layer 22.
- a transparent resin film 26 is formed so as to cover the signal wiring 16 and the second auxiliary capacitance electrode 20, and a pixel electrode (for example, an ITO film is formed) on the resin film 26. 12 is provided.
- the pixel electrode 12 is connected to the second auxiliary capacitance electrode 20 in a contact hole 27 formed in the interlayer insulating film 23.
- the pixel electrode 1 can be obtained by providing the oil film 26. 2 can be superimposed on the thin film transistor 11 and the wiring, and the aperture ratio is improved.
- the liquid crystal display device 100 includes the first auxiliary capacitor Csl and the second auxiliary capacitor Cs2 that are electrically connected in parallel to the liquid crystal capacitor Clc.
- the first auxiliary capacitance counter electrode 18a of the first auxiliary capacitance Csl and the second auxiliary capacitance counter electrode 18b of the second auxiliary capacitance Cs2 are a single common electrode 18, and the first auxiliary capacitance Csl and the second auxiliary capacitance Cs2 is provided so as to overlap vertically. Therefore, in the liquid crystal display device 100 according to the present embodiment, the value of the auxiliary capacity can be increased without significantly increasing the area occupied by the auxiliary capacity. As a result, a high aperture ratio and a sufficiently large auxiliary capacitance value can be realized.
- the second dielectric layer 21 of the second auxiliary capacitor Cs2 is a selectively thinned portion of the interlayer insulating film 23. Therefore, the interlayer insulating film 2 3 (referred to as “parasitic capacitance”) that is adversely affected by the display formed between the wirings facing each other via 3 (for example, between the scanning wiring 15 and the signal wiring 16 and between the auxiliary capacitance wiring 29 and the signal wiring 16).
- the capacity value of the second auxiliary capacity Cs2 can be increased without increasing the amount of calorie. Therefore, a bright and high-quality display is realized.
- etching can be used as a method for selectively thinning a part of the interlayer insulating film 23, for example, etching can be used. As shown in FIG. 4, a resist film 28 having an opening 28a provided in a portion overlapping the common storage capacitor counter electrode 18 is formed on the interlayer insulating film 23, and a part of the interlayer insulating film 23 is formed using the resist film 28 as a mask. By etching the portion, the thinned second dielectric layer 21 can be formed.
- a part of the pixel electrode may be used as the auxiliary capacitance electrode constituting the auxiliary capacitance.
- the auxiliary capacitance is constituted.
- the pixel electrode 12 is used as an auxiliary capacitance electrode.
- the first auxiliary capacitance electrode 17 of the first auxiliary capacitance Csl is a layer formed from the same semiconductor film as the semiconductor layer 22, and the second auxiliary capacitance electrode 20 of the second auxiliary capacitance Cs2 is a signal.
- These are layers formed of the same conductive film as the wiring 16, and all are electrodes formed separately from the pixel electrode 12.
- the pixel electrode When a part of the pixel electrode is used as the auxiliary capacitance electrode, the pixel electrode is formed on the thickness and the resin film. A pole cannot be provided. For this reason, the flatness of the active matrix substrate is impaired and it is difficult to control the cell thickness immediately. In addition, since the pixel electrode cannot be overlapped with the thin film transistor or the wiring, the aperture ratio is lowered.
- the pixel electrode 12 is not used as the auxiliary capacitance electrode, so that the pixel electrode is formed on the thick (specifically, 2.0 m or more) resin film 26.
- a pole 12 can be provided. Therefore, the flatness of the active matrix substrate 100a is ensured and the cell thickness can be easily controlled. Further, the pixel electrode 12 can be overlapped with the thin film transistor 11 and the wiring, so that a higher aperture ratio can be obtained.
- FIG. 3 shows a single-layer interlayer insulating film 23.
- the interlayer insulating film 23 is a multilayer insulating film in which a plurality of layers 23a and 23b are stacked. It may be 23.
- the multilayer insulating film 23 shown in FIG. 5 has a first layer 23a and a second layer 23b in which different insulating material forces are also formed.
- the first layer 23a is, for example, a SiNx layer (relative permittivity is 6.8)
- the second layer 23b formed on the first layer 23a is, for example, an SiO layer (relative permittivity is 3.8). .
- No. 2 No. 2
- the layer 23b is removed on the common auxiliary capacitor counter electrode 18, and this low stacked region 21 from which the second layer 23b is selectively removed functions as the second dielectric layer 21 of the second auxiliary capacitor Cs2.
- the first layer 23a and the second layer 23 can be selectively thinned (thinned) by etching.
- the first layer 23a which is the lower layer, can be used as an etch stop layer by utilizing the etching rate difference from 23b. Therefore, the variation in the thickness of the second dielectric layer 21 can be reduced, and the variation in the auxiliary capacitance value can be reduced.
- the materials of the first layer 23a and the second layer 23b constituting the multilayer insulating film 23 are not limited to those exemplified here, but the viewpoint power to increase the capacitance value of the second auxiliary capacitor Cs2 is As the material of the first layer 23a, it is preferable to use a material having a relative dielectric constant larger than that of the material of the second layer 23b as the upper layer.
- an active matrix liquid crystal display device provided with an auxiliary capacitor having a high aperture ratio and a sufficiently large capacitance value.
- the present invention provides various functions. It is suitably used for an active matrix liquid crystal display device, and when the present invention is used for a high-definition liquid crystal display device, a particularly high effect is obtained.
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US12/294,058 US20090207329A1 (en) | 2006-03-24 | 2007-02-06 | Liquid crystal display |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2006082603 | 2006-03-24 | ||
JP2006-082603 | 2006-03-24 |
Publications (1)
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WO2007111044A1 true WO2007111044A1 (ja) | 2007-10-04 |
Family
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PCT/JP2007/051983 WO2007111044A1 (ja) | 2006-03-24 | 2007-02-06 | 液晶表示装置 |
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US (1) | US20090207329A1 (ja) |
CN (1) | CN101401031A (ja) |
WO (1) | WO2007111044A1 (ja) |
Cited By (2)
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CN101452176B (zh) * | 2007-12-05 | 2012-06-20 | 株式会社半导体能源研究所 | 显示装置及其制造方法 |
JP2022084595A (ja) * | 2008-12-05 | 2022-06-07 | 株式会社半導体エネルギー研究所 | 発光装置 |
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CN102290413B (zh) * | 2010-06-17 | 2013-04-10 | 北京京东方光电科技有限公司 | 阵列基板及其制造方法和液晶显示器 |
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US5917563A (en) * | 1995-10-16 | 1999-06-29 | Sharp Kabushiki Kaisha | Liquid crystal display device having an insulation film made of organic material between an additional capacity and a bus line |
CN1148600C (zh) * | 1996-11-26 | 2004-05-05 | 三星电子株式会社 | 薄膜晶体管基片及其制造方法 |
JP3826618B2 (ja) * | 1999-05-18 | 2006-09-27 | ソニー株式会社 | 液晶表示装置 |
TWI301915B (ja) * | 2000-03-17 | 2008-10-11 | Seiko Epson Corp | |
KR100892945B1 (ko) * | 2002-02-22 | 2009-04-09 | 삼성전자주식회사 | 액티브 매트릭스형 유기전계발광 표시장치 및 그 제조방법 |
CN1621923A (zh) * | 2003-11-29 | 2005-06-01 | 鸿富锦精密工业(深圳)有限公司 | 存储电容 |
US7554619B2 (en) * | 2005-12-05 | 2009-06-30 | Tpo Displays Corp. | Stacked storage capacitor structure for a LTPS TFT-LCD |
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2007
- 2007-02-06 CN CNA2007800088186A patent/CN101401031A/zh active Pending
- 2007-02-06 US US12/294,058 patent/US20090207329A1/en not_active Abandoned
- 2007-02-06 WO PCT/JP2007/051983 patent/WO2007111044A1/ja active Application Filing
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JPH04333828A (ja) * | 1991-05-09 | 1992-11-20 | Sony Corp | 液晶表示装置 |
JPH09292626A (ja) * | 1996-04-24 | 1997-11-11 | Sharp Corp | 液晶表示装置及びその製造方法 |
JP2001144301A (ja) * | 1999-08-31 | 2001-05-25 | Semiconductor Energy Lab Co Ltd | 半導体装置およびその作製方法 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN101452176B (zh) * | 2007-12-05 | 2012-06-20 | 株式会社半导体能源研究所 | 显示装置及其制造方法 |
JP2022084595A (ja) * | 2008-12-05 | 2022-06-07 | 株式会社半導体エネルギー研究所 | 発光装置 |
JP7362804B2 (ja) | 2008-12-05 | 2023-10-17 | 株式会社半導体エネルギー研究所 | 発光装置 |
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US20090207329A1 (en) | 2009-08-20 |
CN101401031A (zh) | 2009-04-01 |
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