WO2011074175A1 - 表示装置及びその製造方法 - Google Patents
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- WO2011074175A1 WO2011074175A1 PCT/JP2010/006607 JP2010006607W WO2011074175A1 WO 2011074175 A1 WO2011074175 A1 WO 2011074175A1 JP 2010006607 W JP2010006607 W JP 2010006607W WO 2011074175 A1 WO2011074175 A1 WO 2011074175A1
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 37
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
- 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 potential barriers; including integrated passive circuit elements having potential barriers 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
- H01L27/1248—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition or shape of the interlayer dielectric specially adapted to the circuit arrangement
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
- 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 potential barriers; including integrated passive circuit elements having potential barriers 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
- H01L27/1259—Multistep manufacturing methods
- H01L27/1288—Multistep manufacturing methods employing particular masking sequences or specially adapted masks, e.g. half-tone mask
Definitions
- the present invention relates to a display device such as a liquid crystal display device and a manufacturing method thereof.
- active matrix display devices such as liquid crystal display devices have been in great demand, and are used in a wide range of fields such as so-called liquid crystal televisions and mobile phones. Along with this, there is a strong demand in the market for higher display quality.
- a liquid crystal display device includes a TFT substrate in which a plurality of TFTs (thin film transistors) are provided for each of a plurality of pixels, a counter substrate opposed to the TFT substrate, and a liquid crystal layer sealed between the TFT substrate and the counter substrate. is doing.
- a plurality of TFTs are formed on a glass substrate, and each TFT is covered with a passivation film (hereinafter referred to as a PAS film) as a protective film. Further, a planarizing film is formed on the surface of the PAS film. A pixel electrode made of ITO (Indium Tin Oxide) or the like is formed on the surface of the planarizing film. A contact hole is formed in the PAS film for conducting the TFT and the pixel electrode.
- a passivation film hereinafter referred to as a PAS film
- a planarizing film is formed on the surface of the PAS film.
- a pixel electrode made of ITO (Indium Tin Oxide) or the like is formed on the surface of the planarizing film.
- a contact hole is formed in the PAS film for conducting the TFT and the pixel electrode.
- the planarizing film is made of a photosensitive resin and the planarizing film is used as a resist (for example, Patent Document 1). And 2 etc.).
- the resist for forming the contact hole functions as a planarizing film, the resist removing step can be eliminated.
- the surface of the flattening film is not a little etched during the dry etching of the PAS film, and thus it is inevitable that the surface of the flattening film is formed in an uneven shape.
- the surface of the pixel electrode is also formed in an uneven shape, which causes a problem of a decrease in display contrast.
- the present invention has been made in view of such various points, and an object of the present invention is to improve display quality so that pixel electrodes can be formed flat.
- the present invention is directed to a method for manufacturing a display device.
- Forming the first planarizing film by exposing and developing the first planarizing film, and forming the first opening through the first planarizing film, and using the first planarizing film as a resist.
- the electrode is exposed As described above, the pixel electrode is formed on the surface of the second flattening film so as to cover the electrode exposed from the second flattening film and the step of forming the second opening through the second flattening film.
- a switching element is formed on a substrate.
- a protective film that covers the electrodes of the switching elements is formed on the substrate.
- a first planarizing film made of a photosensitive material is formed on the surface of the protective film. Thereafter, the first flattening film is exposed and developed, thereby forming a first opening through the first flattening film.
- the protective film exposed from the first opening is dry-etched to expose the electrode of the switching element from the protective film.
- the first planarizing film is slightly etched, so that the surface of the first planarizing film is formed in an uneven shape.
- a second planarizing film made of the same material as that of the first planarizing film is formed on the surface of the first planarizing film so as to cover the electrode exposed from the protective film.
- a second opening is formed through the second planarization film so that the electrode is exposed from the second planarization film.
- a pixel electrode is formed on the surface of the second planarization film so as to cover the electrode exposed from the second planarization film.
- the step of stripping the resist for forming the contact hole is not required, and the surface of the first planarization film formed in an uneven shape by dry etching is formed by the second planarization film. Since planarization is performed, it is possible to improve display quality by forming pixel electrodes flat.
- the step of stripping the resist for forming the contact hole is not required, and the surface of the first planarization film formed in an uneven shape by dry etching is planarized by the second planarization film. Accordingly, the display quality can be improved by forming the pixel electrode flat.
- FIG. 1 is an enlarged plan view showing a part of the liquid crystal display device according to the first embodiment.
- 2 is a cross-sectional view taken along line II-II in FIG.
- FIG. 3 is an enlarged plan view showing a part of FIG.
- FIG. 4 is a cross-sectional view taken along the line IV-IV in FIGS.
- FIG. 5 shows the gate electrode formed on the insulating substrate in the manufacturing process of the liquid crystal display device, and is a cross-sectional view corresponding to the line XI-XI in FIG.
- FIG. 6 shows the TFT island-like semiconductor layer formed on the insulating substrate in the manufacturing process of the liquid crystal display device, and is a cross-sectional view corresponding to the line XI-XI in FIG.
- FIG. 7 shows a TFT formed on an insulating substrate in the manufacturing process of the liquid crystal display device, and is a cross-sectional view corresponding to the line XI-XI in FIG.
- FIG. 8 shows the first planarization film formed on the insulating substrate in the manufacturing process of the liquid crystal display device, and is a cross-sectional view corresponding to the line XI-XI in FIG.
- FIG. 9 shows the first planarization film after dry etching in the manufacturing process of the liquid crystal display device, and is a cross-sectional view corresponding to the line XI-XI in FIG. FIG.
- FIG. 10 shows the second planarizing film laminated on the first planarizing film in the manufacturing process of the liquid crystal display device, and is a cross-sectional view corresponding to the line XI-XI in FIG.
- FIG. 11 is a cross-sectional view taken along line XI-XI in FIG. 1, showing the pixel electrode formed on the second planarizing film in the manufacturing process of the liquid crystal display device.
- FIG. 12 shows auxiliary capacitance electrodes formed on the insulating substrate in the manufacturing process of the liquid crystal display device, and is a cross-sectional view taken along the line IV-IV in FIG. FIG.
- FIG. 13 shows the hole island semiconductor layer formed on the insulating substrate in the manufacturing process of the liquid crystal display device, and is a cross-sectional view taken along the line IV-IV in FIG.
- FIG. 14 shows the drain electrode formed on the insulating substrate in the manufacturing process of the liquid crystal display device, and is a cross-sectional view taken along the line IV-IV in FIG.
- FIG. 15 shows the first opening formed in the first planarization film 21 in the manufacturing process of the liquid crystal display device, and is a cross-sectional view taken along the line IV-IV in FIG.
- FIG. 16 shows a PAS film that has been dry-etched in the manufacturing process of the liquid crystal display device, and is a cross-sectional view taken along the line IV-IV in FIG. FIG.
- FIG. 17 shows a second planarization film that covers the exposed drain electrode in the manufacturing process of the liquid crystal display device, and is a cross-sectional view taken along line IV-IV in FIG.
- FIG. 18 shows the second opening formed in the second planarization film in the manufacturing process of the liquid crystal display device, and is a cross-sectional view taken along the line IV-IV in FIG.
- FIG. 19 shows the pixel electrode formed on the second planarizing film in the manufacturing process of the liquid crystal display device, and is a cross-sectional view taken along the line IV-IV in FIG.
- FIG. 20 is a cross-sectional view illustrating a schematic configuration of the liquid crystal display device according to the first embodiment.
- FIG. 21 shows the second opening formed in the second planarization film in the manufacturing process of the liquid crystal display device, and is equivalent to FIG.
- FIG. 22 shows the pixel electrode formed on the second planarization film in the manufacturing process of the liquid crystal display device, and is a view corresponding to FIG.
- Embodiment 1 of the Invention 1 to 20 show Embodiment 1 of the present invention.
- FIG. 1 is an enlarged plan view showing a part of the liquid crystal display device according to the first embodiment.
- 2 is a cross-sectional view taken along line II-II in FIG.
- FIG. 3 is an enlarged plan view showing a part of FIG.
- FIG. 4 is a cross-sectional view taken along the line IV-IV in FIGS.
- FIG. 20 is a cross-sectional view illustrating a schematic configuration of the liquid crystal display device according to the first embodiment.
- the liquid crystal display device S will be described as an example.
- the liquid crystal display device S is provided between a TFT substrate 31 as an active matrix substrate, a counter substrate 32 arranged to face the TFT substrate 31, and the TFT substrate 31 and the counter substrate 32. And a liquid crystal layer 33 which is a display medium layer.
- the liquid crystal display device S has a display area (not shown) and a frame-like non-display area (not shown) provided around the display area. In the display area, a plurality of pixels (not shown) arranged in a matrix are formed.
- the counter substrate 32 is provided with a color filter, a common electrode, etc. (not shown).
- the liquid crystal layer 33 is sealed by a sealing member 34 provided between the TFT substrate 31 and the counter substrate 32.
- a plurality of source wirings 9 extending in parallel to each other and a plurality of gate wirings 2 extending orthogonally to these are formed on the TFT substrate 31. That is, the wiring group including the gate wiring 2 and the source wiring 9 is formed in a lattice shape as a whole. For example, the pixels are formed in the lattice area.
- a TFT (Thin-Film Transistor) 11 as a switching element and a pixel electrode 14 connected thereto are formed.
- the TFT 11 is connected to the gate line 2 and the source line 9. Further, an auxiliary capacitance line 4 is formed between the adjacent gate lines 2.
- the TFT substrate 31 has a transparent insulating substrate 1 such as a glass substrate, and the gate wiring 2, the gate electrode 2b, the auxiliary capacitance wiring 4, and the auxiliary capacitance electrode are formed on the surface thereof. 4b is formed.
- a gate signal input terminal 2 a is formed at the end of the gate wiring 2.
- an auxiliary capacitance signal input terminal 4 a is formed at the end of the auxiliary capacitance wiring 4.
- a gate insulating film 7 is formed to cover the gate wiring 2, the gate electrode 2b, the auxiliary capacitance wiring 4, and the auxiliary capacitance electrode 4b.
- the gate insulating film 7 is made of, for example, SiNx.
- a TFT portion island-like semiconductor layer 8 is formed so as to overlap the gate electrode 2b, and a hole portion island-like semiconductor layer 20 is formed so as to overlap the auxiliary capacitance electrode 4b.
- Each of the TFT part island-like semiconductor layer 8 and the hole part island-like semiconductor layer 20 has an ia-Si film 8a made of intrinsic amorphous silicon and an n + a-Si film 8b which is an ohmic contact layer laminated thereon. ing.
- a source electrode 9 b and a source wiring 9 are formed so as to cover a part of the TFT part island-like semiconductor layer 8.
- a source signal input terminal 9 c is formed at the end of the source wiring 9.
- a drain electrode 10 is formed on the surface of the gate insulating film 7 so as to cover a part of the TFT island-like semiconductor layer 8 and a part of the hole island-like semiconductor layer 20.
- the TFT 11 having the gate electrode 2b, the TFT part island-like semiconductor layer 8, the source electrode 9b, and the drain electrode 10 is formed on the insulating substrate 1.
- a passivation film (hereinafter referred to as a PAS film) 12 is formed as a protective film covering the source electrode 9b, the drain electrode 10 and the like.
- the PAS film 12 is made of an inorganic film such as SiNx.
- the surface of the PAS film 12 is formed in an uneven shape reflecting the shape of the source electrode 9b, the drain electrode 10 and the like.
- a first planarizing film 21 as a resin insulating film is formed on the surface of the PAS film 12.
- the first planarization film 21 is made of, for example, an acrylic resin containing a photosensitive agent as a photosensitive material.
- the first planarizing film 21 is also used as a resist when the PAS film 12 is etched.
- the surface of the first planarizing film 21 on the second planarizing film 22 side is formed in a slightly uneven shape in the etching process of the PAS film 12.
- a second planarizing film 22 is formed on the surface of the first planarizing film 21.
- the second planarizing film 22 is made of the same material as the first planarizing film 21 and has a surface that is flatter than the first planarizing film 21.
- a contact hole 15 is formed as an opening that penetrates the second planarizing film 22, the first planarizing film 21, and the PAS film 12.
- the inner peripheral surface of the contact hole 15 is constituted by the side surfaces of the second planarizing film 22, the first planarizing film 21, and the PAS film 12.
- a pixel electrode 14 is formed inside the contact hole 15 and on the surface of the second planarization film 22.
- the pixel electrode 14 is made of, for example, a transparent conductive film such as ITO, and is electrically connected to the drain electrode 10 of the TFT 11.
- Switching element formation process First, as shown in FIGS. 5 to 7 and FIGS. 12 to 14, a step of forming a switching element is performed.
- FIG. 5 shows the gate electrode 2b formed on the insulating substrate 1, and is a cross-sectional view corresponding to the line XI-XI in FIG. 6 shows the TFT part island-like semiconductor layer 8 formed on the insulating substrate 1, and is a cross-sectional view corresponding to the line XI-XI in FIG.
- FIG. 7 shows the TFT 11 formed on the insulating substrate 1, and is a cross-sectional view corresponding to the line XI-XI in FIG.
- FIG. 12 shows the auxiliary capacitance electrode 4b formed on the insulating substrate 1, and is a cross-sectional view corresponding to the line IV-IV in FIG.
- FIG. 13 shows the hole portion island-shaped semiconductor layer 20 formed on the insulating substrate 1, and is a cross-sectional view taken along the line IV-IV in FIG.
- FIG. 14 shows the drain electrode 10 formed on the insulating substrate 1, and is a cross-sectional view corresponding to the line IV-IV in FIG.
- a metal thin film such as Ti, Al, Cr or the like is formed on the cleaned insulating substrate 1 such as a glass substrate by a sputtering method or the like.
- a resist pattern through a resist coating process, an exposure process, and a development process, dry etching or wet etching is performed.
- the gate electrode 2b, the gate wiring 2, the gate signal input terminal 2a, the auxiliary capacitance electrode 4b, the auxiliary capacitance wiring 4, and the auxiliary capacitance signal input terminal 4a are formed on the insulating substrate 1.
- a gate insulating film 7 made of SiNx is formed on the entire surface of the insulating substrate 1 using SiH 4 , NH 3 , and N 2 gas by P-CVD.
- an ia-Si film 8a as an ia-Si layer made of intrinsic amorphous silicon and an n + a-Si layer doped with phosphorus (P) as an ohmic contact layer are formed on the surface of the gate insulating film 7 by P-CVD.
- an n + a-Si film 8b is formed.
- the n + a-Si film 8b uses SiH 4 or H 2 gas in which 0.5% of PH 3 gas is mixed.
- the ia-Si film 8a and the n + a-Si film 8b formed as described above are formed by the first island including the ia-Si film 8a and the n + a-Si film 8b so as to overlap the gate electrode 2b by photolithography or the like.
- the TFT island-like semiconductor layer 8 as a semiconductor layer is patterned.
- a hole island semiconductor as a second island semiconductor layer made of amorphous silicon so as to partially overlap the auxiliary capacitance electrode 4b via the gate insulating film 7 Layer 20 is formed.
- a thin metal film such as Ti, Al, Cr, etc. is formed on the entire surface of the substrate by sputtering or the like, and one end of the TFT portion island-like semiconductor layer 8 is formed by photolithography.
- the drain electrode 10 is overlapped with the hole island semiconductor layer 20 on the auxiliary capacitance electrode 4b at the other end, and at a portion overlapping with the hole island semiconductor layer 20 as shown in FIGS. A pattern is formed so as to have the notch 16. Then, a part of the hole portion island-shaped semiconductor layer 20 is exposed from the drain electrode 10 inside the notch 16.
- the n + a-Si film 8b portion of the hole island-like semiconductor layer 20 exposed from the notch 16 on the auxiliary capacitance electrode 4b is removed by etching.
- the TFT part island-like semiconductor layer 8 overlapping the gate electrode 2b is etched using the source electrode 9b and the drain electrode 10 overlapping the mask as a mask, so that the n + a-Si film 8b of the TFT part island-like semiconductor layer 8 is etched. Are separated from each other. In this way, the TFT 11 is formed.
- PAS film formation process Next, as shown in FIGS. 8 and 15, a process of forming a PAS film 12 that is a protective film covering the drain electrode 10 of the TFT 11 on the insulating substrate 1 is performed.
- FIG. 8 shows the first planarization film 21 formed on the insulating substrate 1, and is a cross-sectional view corresponding to the line XI-XI in FIG.
- FIG. 15 shows the first opening 23 formed in the first planarizing film 21, and is a cross-sectional view taken along the line IV-IV in FIG.
- a PAS film 12 as a first protective film made of SiNx is formed on the entire surface of the substrate by using SiH 4 , NH 3 , and N 2 gas by P-CVD.
- the surface of the PAS film 12 is formed in a concavo-convex shape reflecting the stepped surfaces such as the drain electrode 10, the source electrode 9 b, and the hole portion island-shaped semiconductor layer 20.
- a first planarization film 21 that is a resin insulating film is formed on the surface of the PAS film 12. That is, the first planarizing film 21 made of an acrylic resin containing an insulating photosensitive agent is applied to the entire surface of the PAS film 12 by a spin coat method or the like.
- an area corresponding to a predetermined pattern of the mask is exposed to the first planarizing film 21 using an exposure apparatus, and the exposed area of the first planarizing film 21 is removed in the developing process.
- the exposure amount at this time is, for example, 130 mJ to 140 mJ.
- a first opening 23 is formed in the first planarization film 21 above the drain electrode 10 overlapping the hole island-like semiconductor layer 20. Further, the notch 16 of the drain electrode 10 described above is disposed inside the first opening 23. Next, the first planarizing film 21 is cured by performing a heat treatment or the like.
- FIG. 9 shows the first planarization film 21 after dry etching, and is a cross-sectional view corresponding to the line XI-XI in FIG.
- FIG. 16 shows the dry-etched PAS film 12 and is a cross-sectional view corresponding to the line IV-IV in FIG.
- a mixed gas of CF 4 and O 2 is used in a dry etcher in RIE mode, and the PAS film 12 exposed from the first opening 23 is dry-etched using the first planarization film 21 as a resist. As a result, the drain electrode 10 is exposed from the PAS film 12.
- the drain electrode 10 exposed from the PAS film 12 serves as a mask, and the hole portion island-shaped semiconductor layer 20 overlapping the drain electrode 10 remains without being etched.
- the hole portion island-shaped semiconductor layer 20 overlapping the drain electrode 10 remains without being etched.
- a part of the region that does not overlap with the drain electrode 10 in the hole part island-like semiconductor layer 20 is etched.
- the third opening 26 serving as an opening exposing the drain electrode 10 from the PAS film 12 becomes the first planarization film 21 and the PAS. Formed on the film 12. Further, as shown in FIGS. 9 and 16, the surface of the first planarizing film 21 is damaged by etching and is formed in an uneven shape.
- FIG. 10 shows the second planarizing film 22 laminated on the first planarizing film 21, and is a cross-sectional view corresponding to the line XI-XI in FIG.
- FIG. 17 shows the second planarization film 22 that covers the exposed drain electrode 10, and is a cross-sectional view taken along the line IV-IV in FIG.
- the second planarizing film 22 made of the same material as the first planarizing film 21 is covered with the drain electrode 10 exposed from the PAS film 12 and a part of the hole portion island-shaped semiconductor layer 20. It is formed on the surface of the first planarizing film 21.
- the second planarizing film 22 is formed by applying an acrylic resin containing an insulating photosensitive agent to the inside of the third opening 26 and the entire surface of the first planarizing film 21 by a spin coating method or the like. . Thereby, the uneven surface of the first planarizing film 21 is planarized.
- the thickness of the second planarizing film 22 formed in this way is, for example, about 1000 nm to 3000 nm.
- the thickness of the first planarizing film 21 is, for example, about 1000 nm to 2000 nm
- the total thickness of the first planarizing film 21 and the second planarizing film 22 is about 3000 nm to 4000 nm.
- a second opening 24 is formed through the second planarization film 22 so that the drain electrode 10 is exposed from the second planarization film 22.
- FIG. 18 shows the second opening 24 formed in the second planarizing film 22 and is a cross-sectional view corresponding to the line IV-IV in FIG.
- the second planarizing film 22 on the hole island-like semiconductor layer 20 is passed through the same mask as that used for forming the first opening 23 using the exposure apparatus. To expose.
- the amount of exposure at this time is larger than that in the case of the first opening 23, for example, 150 mJ to 170 mJ.
- the second planarizing film 22 in the third opening 26 is removed and the drain electrode 10 overlapping the hole-portion island-like semiconductor layer 20.
- a second opening 24 is formed above the first opening 24.
- the second opening 24 is formed larger than the third opening 26, and the inner peripheral surface of the second opening 24 is disposed outside the outer edge of the third opening 26.
- a contact hole 15 is formed as a recess including the second opening 24 and the third opening 26.
- the second planarizing film 22 is cured by performing a heat treatment or the like.
- the pixel electrode 14 is formed on the surface of the second planarization film 22 so as to cover the drain electrode 10 exposed from the second planarization film 22.
- FIG. 11 shows the pixel electrode 14 formed on the second planarizing film 22, and is a cross-sectional view taken along the line XI-XI in FIG.
- FIG. 19 shows the pixel electrode 14 formed on the second planarizing film 22, and is a cross-sectional view corresponding to the line IV-IV in FIG.
- a transparent conductive film made of, for example, ITO (Indium Tin Oxide) or the like to be the pixel electrode 14 is formed by sputtering or the like on the surface of the second planarizing film 22 and inside the contact hole 15. Subsequently, the pixel electrode 14 connected to the drain electrode 10 is formed by patterning this into a predetermined shape by a photolithography method or the like.
- ITO Indium Tin Oxide
- the conductive film constituting the pixel electrode 14 is not necessarily limited to ITO, and may be a reflective display electrode by using, for example, a non-light-transmitting conductive film such as Al or Ag.
- the TFT substrate 31 is manufactured.
- the counter substrate 32 is manufactured by forming a counter electrode, a color filter, or the like on another insulating substrate. Then, the TFT substrate 31 and the counter substrate 32 are bonded together via the liquid crystal layer 33 and the seal member 34, whereby the liquid crystal display device S is manufactured.
- the PAS film 12 is first dry-etched using the first planarizing film 21 as a resist, and then the surface of the first planarizing film 21 is made of the same material as the first planarizing film 21. Since the second planarizing film 22 to be formed is formed, the step of stripping the resist for forming the contact hole 15 can be eliminated.
- the surface of the first planarizing film 21 is formed in an uneven shape.
- the surface of the first planarization film 21 formed in an uneven shape by this dry etching can be planarized by the second planarization film 22.
- the pixel electrode 14 can be formed flat on the surface of the second flattening film 22 made of the same material as the first flattening film 21, so that the display quality can be improved.
- the second opening 24 formed in the second planarizing film 22 is formed larger than the third opening 26, a part of the second planarizing film 22 is located inside the third opening 26. Since it is not formed, the drain electrode 10 and the pixel electrode 14 can be reliably conducted even if the third opening 26 is formed to be relatively small.
- Embodiment 2 of the Invention >> 21 and 22 show Embodiment 2 of the present invention.
- FIG. 21 shows the second opening 24 formed in the second planarizing film 22 in the manufacturing process of the liquid crystal display device S, and is equivalent to FIG.
- FIG. 22 shows the pixel electrode 14 formed on the second planarizing film 22 in the manufacturing process of the liquid crystal display device S, which corresponds to FIG.
- the same parts as those in FIGS. 1 to 20 are denoted by the same reference numerals, and detailed description thereof is omitted.
- the second opening 24 formed in the second planarization film is formed larger than the third opening 26, whereas in the second embodiment, the second opening 24 is the third opening.
- the difference is that it is smaller than 26. That is, as shown in FIG. 21, the second opening 24 is smaller than the third opening 26, so that the inner surface of the third opening 26 is covered with the second planarization film 22.
- the second opening 24 in the first embodiment in the step of forming the second opening 24 in the first embodiment, while using the same mask as the mask used for forming the first opening 23, The exposure amount is made smaller than in the case of the first embodiment.
- the second opening 24 can be formed smaller than the third opening 26, and the inner surface of the third opening 26 can be covered with the second planarization film 22.
- the pixel electrode 14 is formed in the same manner as in the first embodiment.
- a transparent conductive film such as ITO which becomes the pixel electrode 14 is formed by sputtering or the like on the surface of the second planarizing film 22 and inside the contact hole 15.
- the pixel electrode 14 is formed by patterning into a predetermined shape by a photolithography method or the like.
- the second opening 24 formed in the second planarizing film 22 is formed to be smaller than the third opening 26 so that the inner surface of the third opening 26 is covered by the second planarizing film 22. Therefore, the inner peripheral surface of the contact hole in which the pixel electrode 14 is formed can be a gentle surface. As a result, disconnection of the pixel electrode 14 on the inner peripheral surface of the contact hole can be prevented.
- the liquid crystal display device has been described as an example.
- the present invention is not limited to this, and is widely applied to other display devices such as an organic EL display device having a TFT and other switching elements. Can do.
- the present invention is useful for a display device such as a liquid crystal display device and a method for manufacturing the same.
- S Liquid crystal display device 1 Insulating substrate 10 Drain electrode (electrode of switching element) 11 TFT (switching element) 12 PAS film (protective film) 14 Pixel electrode 15 Contact hole (opening) 21 First planarization film 22 Second planarization film 23 First opening 24 Second opening 26 Third opening
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Abstract
Description
次に、本発明の作用について説明する。
図1~図20は、本発明の実施形態1を示している。
次に、上記液晶表示装置Sの製造方法について説明する。
まず、図5~図7、及び図12~図14に示すように、スイッチング素子を形成する工程を行う。
次に、図8及び図15に示すように、絶縁性基板1上に上記TFT11のドレイン電極10を覆う保護膜であるPAS膜12を形成する工程を行う。
次に、図8及び図15に示すように、PAS膜12の表面に、樹脂絶縁膜である第1平坦化膜21を形成する。すなわち、PAS膜12表面の全体に、絶縁性を有する感光剤を含むアクリル樹脂からなる第1平坦化膜21をスピンコート法等によって塗布する。
次に、図15に示すように、第1平坦化膜21を露光及び現像することにより、この第1平坦化膜21に第1開口部23を間津形成する工程を行う。
次に、図9及び図16に示すように、PAS膜12をエッチングする工程を行う。
次に、図10及び図17に示すように、第2平坦化膜22の形成工程を行う。
次に、図18に示すように、第2平坦化膜22からドレイン電極10が露出するように、第2平坦化膜22に第2開口部24を貫通形成する。
次に、図11及び図19に示すように、第2平坦化膜22から露出しているドレイン電極10を覆うように、この第2平坦化膜22の表面に画素電極14を形成する。
したがって、この実施形態1によると、まず、第1平坦化膜21をレジストとしてPAS膜12をドライエッチングした後、その第1平坦化膜21の表面に、第1平坦化膜21と同じ材料からなる第2平坦化膜22を形成するようにしたので、コンタクトホール15を形成するためのレジストを剥離する工程を不要にすることができる。
図21及び図22は、本発明の実施形態2を示している。
上記実施形態では、液晶表示装置を例に挙げて説明したが、本発明はこれに限らず、TFTや、その他のスイッチング素子を有する有機EL表示装置等の他の表示装置について、広く適用することができる。
1 絶縁性基板
10 ドレイン電極(スイッチング素子の電極)
11 TFT(スイッチング素子)
12 PAS膜(保護膜)
14 画素電極
15 コンタクトホール(開口部)
21 第1平坦化膜
22 第2平坦化膜
23 第1開口部
24 第2開口部
26 第3開口部
Claims (9)
- 基板上にスイッチング素子を形成する工程と、
上記基板上に上記スイッチング素子の電極を覆う保護膜を形成する工程と、
上記保護膜の表面に、感光性材料からなる第1平坦化膜を形成する工程と、
上記第1平坦化膜を露光及び現像することにより、該第1平坦化膜に第1開口部を貫通形成する工程と、
上記第1平坦化膜をレジストとして、上記第1開口部から露出している上記保護膜をドライエッチングすることにより、当該保護膜から上記スイッチング素子の電極を露出させる工程と、
上記第1平坦化膜と同じ材料からなる第2平坦化膜を、上記保護膜から露出している電極を覆うように、上記第1平坦化膜の表面に形成する工程と、
上記第2平坦化膜を露光及び現像することにより、該第2平坦化膜から上記電極が露出するように、該第2平坦化膜に第2開口部を貫通形成する工程と、
上記第2平坦化膜から露出している電極を覆うように、該第2平坦化膜の表面に画素電極を形成する工程とを有する
ことを特徴とする表示装置の製造方法。 - 請求項1に記載された表示装置の製造方法において、
上記ドライエッチングする工程では、上記保護膜から上記電極を露出させる開口部としての第3開口部が、上記第1平坦化膜及び上記保護膜に形成され、
上記第2開口部を形成する工程では、上記第2開口部を上記第3開口部よりも大きく形成する
ことを特徴とする表示装置の製造方法。 - 請求項1に記載された表示装置の製造方法において、
上記ドライエッチングする工程では、上記保護膜から上記電極を露出させる開口部としての第3開口部が、上記第1平坦化膜及び上記保護膜に形成され、
上記第2開口部を形成する工程では、上記第2開口部を上記第3開口部よりも小さく形成することにより、該第2平坦化膜によって上記第3開口部の内側表面を覆う
ことを特徴とする表示装置の製造方法。 - 請求項1乃至3の何れか1つに記載された表示装置の製造方法において、
上記保護膜は無機膜によって構成されている
ことを特徴とする表示装置の製造方法。 - 請求項1乃至4の何れか1つに記載された表示装置の製造方法において、
上記第1平坦化膜及び上記第2平坦化膜は、感光剤を含むアクリル樹脂によって構成されている
ことを特徴とする表示装置の製造方法。 - 基板上に形成されたスイッチング素子と、
上記スイッチング素子の電極を覆うように、上記基板上に形成された保護膜と、
上記保護膜の表面に形成されると共に感光性材料からなる第1平坦化膜と、
上記第1平坦化膜の表面に形成され、該第1平坦化膜と同じ材料からなる第2平坦化膜と、
上記スイッチング素子の電極上に形成され、上記第1平坦化膜、上記第2平坦化膜及び上記保護膜を貫通する開口部と、
上記開口部の内側及び上記第2平坦化膜の表面に形成され、上記スイッチング素子の電極に接続された画素電極とを備えている
ことを特徴とする表示装置。 - 請求項6に記載された表示装置において、
上記第1平坦化膜の上記第2平坦化膜側の表面は、凹凸状に形成されている
ことを特徴とする表示装置。 - 請求項6又は7に記載された表示装置において、
上記保護膜は無機膜によって構成されている
ことを特徴とする表示装置。 - 請求項6乃至8の何れか1つに記載された表示装置において、
上記第1平坦化膜及び上記第2平坦化膜は、感光剤を含むアクリル樹脂によって構成されている
ことを特徴とする表示装置。
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JP2000299377A (ja) * | 1999-04-14 | 2000-10-24 | Sony Corp | 多層配線およびその形成方法 |
JP2004145024A (ja) * | 2002-10-24 | 2004-05-20 | Advanced Display Inc | Tftアレイ基板およびこれを用いた半透過型または反射型液晶表示装置並びにtftアレイ基板の製造方法 |
JP2004303645A (ja) * | 2003-03-31 | 2004-10-28 | Seiko Epson Corp | 電気光学装置の製造方法、及び電気光学装置、並びに電子機器 |
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JP2004145024A (ja) * | 2002-10-24 | 2004-05-20 | Advanced Display Inc | Tftアレイ基板およびこれを用いた半透過型または反射型液晶表示装置並びにtftアレイ基板の製造方法 |
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