WO2012046442A1 - Dispositif d'affichage à cristaux liquides - Google Patents

Dispositif d'affichage à cristaux liquides Download PDF

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Publication number
WO2012046442A1
WO2012046442A1 PCT/JP2011/005606 JP2011005606W WO2012046442A1 WO 2012046442 A1 WO2012046442 A1 WO 2012046442A1 JP 2011005606 W JP2011005606 W JP 2011005606W WO 2012046442 A1 WO2012046442 A1 WO 2012046442A1
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Prior art keywords
substrate
liquid crystal
columnar spacer
crystal display
display device
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PCT/JP2011/005606
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English (en)
Japanese (ja)
Inventor
崇文 水卜
健司 御園
渡辺　典子
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シャープ株式会社
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Publication of WO2012046442A1 publication Critical patent/WO2012046442A1/fr

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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
    • G02F1/1339—Gaskets; Spacers; Sealing of cells
    • G02F1/13394—Gaskets; Spacers; Sealing of cells spacers regularly patterned on the cell subtrate, e.g. walls, pillars
    • 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
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134336—Matrix

Definitions

  • the present invention relates to a liquid crystal display device having columnar spacers for maintaining the thickness of a liquid crystal layer constant.
  • a liquid crystal display device includes a TFT substrate on which a plurality of thin film transistors (TFTs) are formed, a counter substrate facing the TFT substrate, and a liquid crystal layer provided between the TFT substrate and the counter substrate. is doing.
  • a plurality of columnar spacers are interposed between the TFT substrate and the counter substrate in order to keep the thickness of the liquid crystal layer constant.
  • a TFT substrate 101 has a glass substrate 102 on which the above-described TFT and the like (not shown) are formed.
  • An interlayer insulating film (not shown) that covers the TFT is formed on the glass substrate 102, and a transparent electrode 103 made of ITO (Indium Tin Oxide) or the like is formed on the surface thereof.
  • a plurality of columnar spacers 104 are formed on the surface of the transparent electrode 103.
  • the transparent electrode 103 is covered with an alignment film 105.
  • the counter substrate 107 also has a glass substrate 108, and a transparent electrode 109 such as ITO is formed on the surface of the glass substrate 108.
  • the transparent electrode 109 of the counter substrate 107 is also covered with the alignment film 110. Then, as shown in FIG. 21, the gap between the TFT substrate 101 and the counter substrate 107 (that is, the thickness of the liquid crystal layer) is kept constant by the tips of the columnar spacers 104 coming into contact with the surface of the counter substrate 107. Yes.
  • Patent Document 1 As shown in FIG. 22, for the columnar spacer 104 formed on the TFT substrate 101, the area of the tip 111 of the columnar spacer 104 is indicated at the base end portion 112 of the columnar spacer 104. It is disclosed that the area is smaller than the area of the end face. As a result, the stress applied to the columnar spacers 104 is dispersed on the base end side of the columnar spacers 104 to prevent destruction of the elements and the like.
  • the tip of the columnar spacer is formed in a convex shape, so that stress concentration is more likely to occur.
  • Such a crack in the transparent electrode causes light leakage on the viewer side, leading to deterioration in display quality.
  • the present invention has been made in view of such a point, and an object thereof is to suppress light leakage to the observer side in the vicinity of the columnar spacer.
  • a liquid crystal display device includes a first substrate, a second substrate disposed opposite to the first substrate, and the first substrate and the second substrate.
  • the present invention is intended for a liquid crystal display device including a liquid crystal layer provided and a plurality of columnar spacers formed on the first substrate or the second substrate and defining a thickness of the liquid crystal layer to be constant.
  • a first transparent electrode is formed on the liquid crystal layer side of the first substrate, a second transparent electrode is formed on the liquid crystal layer side of the second substrate, and the first transparent electrode and the first transparent electrode are formed.
  • an opening is formed in a region where the columnar spacer is disposed, and an end of the columnar spacer is disposed inside the opening.
  • At least one of the first transparent electrode and the second transparent electrode is formed with an opening in the arrangement region of the columnar spacers.
  • the edge part of the columnar spacer is arrange
  • the present invention it is possible to suppress the occurrence of cracks in the first transparent electrode or the second transparent electrode, and to suppress light leakage to the observer side in the vicinity of the columnar spacer.
  • FIG. 1 is an enlarged cross-sectional view showing the main structure of the liquid crystal display device according to the first embodiment.
  • FIG. 2 is a cross-sectional view showing the TFT substrate and the counter substrate before being bonded to each other in the first embodiment.
  • FIG. 3 is an enlarged cross-sectional view showing the vicinity of the columnar spacer in the first embodiment.
  • FIG. 4 is an enlarged cross-sectional view showing the main structure of the liquid crystal display device according to the second embodiment.
  • FIG. 5 is a cross-sectional view showing the TFT substrate and the counter substrate before being bonded to each other in the second embodiment.
  • FIG. 6 is an enlarged sectional view showing the vicinity of the columnar spacer in the second embodiment.
  • FIG. 7 is an enlarged cross-sectional view showing the main structure of the liquid crystal display device according to the third embodiment.
  • FIG. 8 is an enlarged cross-sectional view showing the main structure of the liquid crystal display device according to the fourth embodiment.
  • FIG. 9 is a cross-sectional view showing the TFT substrate and the counter substrate before being bonded to each other in the fourth embodiment.
  • FIG. 10 is an enlarged sectional view showing the vicinity of the columnar spacer in the fourth embodiment.
  • FIG. 11 is an enlarged cross-sectional view showing the main structure of the liquid crystal display device according to the fifth embodiment.
  • FIG. 12 is a cross-sectional view showing the TFT substrate and the counter substrate before being bonded to each other in the fifth embodiment.
  • FIG. 13 is an enlarged sectional view showing the vicinity of the columnar spacer in the fifth embodiment.
  • FIG. 14 is an enlarged cross-sectional view showing the main structure of the liquid crystal display device according to the sixth embodiment.
  • FIG. 15 is a cross-sectional view showing the TFT substrate and the counter substrate before being bonded to each other in the sixth embodiment.
  • FIG. 16 is an enlarged sectional view showing the vicinity of the columnar spacer in the sixth embodiment.
  • FIG. 17 is an enlarged cross-sectional view showing the main structure of the liquid crystal display device according to the seventh embodiment.
  • FIG. 18 is a cross-sectional view showing the TFT substrate and the counter substrate before being bonded to each other in the seventh embodiment.
  • FIG. 19 is an enlarged sectional view showing the vicinity of the columnar spacer in the seventh embodiment.
  • FIG. 20 is a cross-sectional view showing a conventional TFT substrate and a counter substrate before being bonded to each other.
  • FIG. 21 is an enlarged cross-sectional view showing a main part structure of a conventional liquid crystal display device.
  • FIG. 22 is an enlarged sectional view showing the vicinity of a conventional columnar spacer.
  • Embodiment 1 of the Invention 1 to 3 show Embodiment 1 of the present invention.
  • FIG. 1 is an enlarged cross-sectional view showing the main structure of the liquid crystal display device 1 according to the first embodiment.
  • FIG. 2 is a cross-sectional view showing the TFT substrate 11 and the counter substrate 12 before being bonded to each other in the first embodiment.
  • FIG. 3 is an enlarged cross-sectional view showing the vicinity of the columnar spacer 20 in the first embodiment.
  • the liquid crystal display device 1 includes a liquid crystal display panel 10 and a backlight unit (not shown) that is an illumination device disposed to face the liquid crystal display panel 10 and is configured to perform at least transmissive display. Yes.
  • the liquid crystal display panel 10 includes a TFT substrate 11 that is a first substrate configured as an active matrix substrate, and a counter substrate 12 that is a second substrate disposed to face the TFT substrate 11. And a liquid crystal layer 13 provided between the TFT substrate 11 and the counter substrate 12.
  • the counter substrate 12 has a transparent plastic substrate 22 as a flexible substrate.
  • a common electrode 15 as a second transparent electrode is formed on the liquid crystal layer 13 side of the counter substrate 12.
  • the common electrode 15 is made of, for example, a transparent conductive film such as ITO, and is formed over substantially the entire display area (not shown).
  • the display area is an area in which an image is displayed, and a plurality of pixels (not shown) arranged in a matrix are formed.
  • An alignment film 16 made of polyimide or the like is formed on the surface of the common electrode 15 on the liquid crystal layer 13 side.
  • the counter substrate 12 is provided with a color filter and a black matrix (light shielding film) (not shown).
  • the TFT substrate 11 has a transparent plastic substrate 21 as a flexible substrate.
  • a TFT (not shown) is formed for each pixel on the liquid crystal layer 13 side of the TFT substrate 11.
  • the TFT is covered with an interlayer insulating film (not shown).
  • a pixel electrode 17 as a first transparent electrode is formed on the surface of the interlayer insulating film on the liquid crystal layer 13 side of the plastic substrate 21.
  • the pixel electrode 17 is made of, for example, a transparent conductive film such as ITO, and is provided for each pixel. In each pixel, the pixel electrode 17 is connected to the TFT.
  • An alignment film 18 made of polyimide or the like is formed on the surface of the pixel electrode 17 on the liquid crystal layer 13 side.
  • a plurality of columnar spacers 20 having the same height are formed on the TFT substrate 11.
  • the columnar spacer 20 is made of a photosensitive resin material and is formed by photolithography.
  • Each columnar spacer 20 is for defining the thickness of the liquid crystal layer 13 to be constant, and is formed to protrude from the surface of the TFT substrate 11 toward the counter substrate 12.
  • the columnar spacer 20 has an end surface area on the TFT substrate 11 side larger than an end surface area on the counter substrate 12 side, and is formed in a trapezoidal cross section.
  • the common electrode 15 has an opening 25 in a region where the columnar spacer 20 is disposed (that is, a region facing the tip of the columnar spacer 20). In other words, a part of the common electrode 15 is removed in a region facing the tip of the columnar spacer 20.
  • the edge part of the columnar spacer 20 is arrange
  • a portion of the alignment film 18 is interposed between the tip of the columnar spacer 20 and the plastic substrate 22 of the counter substrate 12.
  • the liquid crystal display device 1 is manufactured by bonding a TFT substrate 11 and a counter substrate 12 that are manufactured in advance to each other via a liquid crystal layer 13 and a seal member (not shown).
  • the sealing member is drawn on the counter substrate 12 in a rectangular frame shape, and a liquid crystal material is dropped and supplied into the frame of the sealing member.
  • the counter substrate 12 is aligned and attached to the TFT substrate 11.
  • the sealing member is cured by irradiating the sealing member with ultraviolet rays.
  • the sealing member may be drawn not on the counter substrate 12 but on the TFT substrate 11.
  • a TFT (not shown) is formed on the plastic substrate 21 by photolithography.
  • an interlayer insulating film (not shown) covering the TFT, an ITO film as a transparent conductive film material is formed on the surface of the interlayer insulating film.
  • a plurality of pixel electrodes 17 are formed by etching this ITO film.
  • a photosensitive resin film (not shown) is formed on the surface of the pixel electrode 17, and a plurality of columnar spacers 20 are formed by performing photolithography and etching on the photosensitive resin film. Thereafter, the alignment film 18 is formed on the surface of the pixel electrode 17 to manufacture the TFT substrate 11.
  • the common electrode 15 is formed by forming an ITO film on at least the entire display region on the surface of the plastic substrate 22. Next, the common electrode 15 is etched to form a plurality of openings 25 so as to open in a region facing the tip of the columnar spacer 20. Thereafter, the alignment film 16 is formed on the surface of the common electrode 15 to manufacture the counter substrate 12.
  • the TFT substrate 11 and the counter substrate 12 are bonded to each other.
  • the tip of the columnar spacer 20 is inserted into the opening 25 in the common electrode 15.
  • the liquid crystal display device 1 is manufactured.
  • the column spacer 20 supports the counter substrate 12.
  • no stress concentration occurs in the common electrode 15 due to the end of the columnar spacer 20 in the opening 25. That is, the stress applied to the counter substrate 12 from the tip of the columnar spacer 20 is applied to the plastic substrate 22 through the alignment film 16 in the opening 25 as shown in FIG. No stress is applied. Therefore, as a result of suppressing the occurrence of cracks in the common electrode 15, it is possible to suppress light leakage to the observer side in the vicinity of the columnar spacer 20.
  • the pixel electrode 17 is formed at the base end of the columnar spacer 20. Since the generated stress can be dispersed, the occurrence of cracks can be suppressed not only in the common electrode 15 provided with the opening 25 but also in the pixel electrode 17.
  • Embodiment 2 of the Invention >> 4 to 6 show Embodiment 2 of the present invention.
  • FIG. 4 is an enlarged cross-sectional view showing the main structure of the liquid crystal display device 1 of the second embodiment.
  • FIG. 5 is a cross-sectional view showing the TFT substrate 11 and the counter substrate 12 before being bonded to each other in the second embodiment.
  • FIG. 6 is an enlarged sectional view showing the vicinity of the columnar spacer 20 in the second embodiment.
  • the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof will be omitted.
  • the opening 26 is formed not only in the common electrode 15 but also in the pixel electrode 17 in the first embodiment.
  • the pixel electrode 17 in the present embodiment has an opening 26 in a region where the columnar spacer 20 is disposed.
  • the base end of the columnar spacer 20 is formed on the plastic substrate 21 in the opening 26 of the pixel electrode 17.
  • the end of the columnar spacer 20 is disposed in the opening 25 of the common electrode 15 and supports the plastic substrate 22 via the alignment film 16.
  • the TFT substrate 11 in the present embodiment As in the first embodiment, after forming an ITO film on the surface of the interlayer insulating film, by performing photolithography and etching on the ITO film, An opening 26 is formed in the pixel electrode 17. Thereafter, a photosensitive resin film is formed on the pixel electrode 17, and a plurality of columnar spacers 20 are formed in the opening 26 by performing photolithography and etching on the photosensitive resin film. Thereafter, the alignment film 18 is formed on the surface of the pixel electrode 17 to manufacture the TFT substrate 11.
  • the common electrode 15 of the counter substrate 12 is formed with the opening 25 in the region facing the tip of the columnar spacer 20.
  • no stress concentration occurs on the common electrode 15 due to the end of the columnar spacer 20 in the opening 25. That is, the stress applied to the counter substrate 12 from the tip of the columnar spacer 20 is applied to the plastic substrate 22 through the alignment film 16 in the opening 25 as shown in FIG. No stress is applied.
  • the columnar spacer 20 is formed on the plastic substrate 21 so that the base end of the columnar spacer 20 is disposed in the opening 26 formed in the pixel electrode 17, the columnar spacer 20 In a state where the counter substrate 12 is supported, stress concentration on the pixel electrode 17 due to the base end of the columnar spacer 20 can be prevented. As a result, the occurrence of cracks in the common electrode 15 and the pixel electrode 17 can be suppressed, so that light leakage to the viewer side in the vicinity of the columnar spacer 20 can be suppressed.
  • FIG. 7 shows Embodiment 3 of the present invention.
  • FIG. 7 is an enlarged cross-sectional view showing the main structure of the liquid crystal display device 1 according to the third embodiment.
  • the opening 25 is formed in the common electrode 15, whereas in the third embodiment, the opening 26 is formed in the pixel electrode 17 instead of the common electrode 15.
  • the pixel electrode 17 has an opening 26 in a region where the columnar spacer 20 is disposed. As shown in FIG. 7, the base end of the columnar spacer 20 is formed on the plastic substrate 21 in the opening 26 of the pixel electrode 17.
  • the columnar spacer 20 is formed on the plastic substrate 21 so that the base end of the columnar spacer 20 is disposed in the opening 26 formed in the pixel electrode 17.
  • stress concentration on the pixel electrode 17 by the base end of the columnar spacer 20 can be prevented.
  • the occurrence of cracks in the pixel electrode 17 can be suppressed, so that light leakage to the viewer side in the vicinity of the columnar spacer 20 can be suppressed.
  • Embodiment 4 of the Invention >> 8 to 10 show Embodiment 4 of the present invention.
  • FIG. 8 is an enlarged cross-sectional view showing the main structure of the liquid crystal display device 1 according to the fourth embodiment.
  • FIG. 9 is a cross-sectional view showing the TFT substrate 11 and the counter substrate 12 before being bonded to each other in the fourth embodiment.
  • FIG. 10 is an enlarged sectional view showing the vicinity of the columnar spacer 20 in the fourth embodiment.
  • a light shielding film 28 is provided in a region corresponding to the columnar spacer 20 in the counter substrate 12 in the third embodiment.
  • the pixel electrode 17 in the present embodiment has an opening 26 in a region where the columnar spacer 20 is disposed.
  • the base end of the columnar spacer 20 is formed on the plastic substrate 21 in the opening 26 of the pixel electrode 17.
  • the tip of the columnar spacer 20 is in contact with the surface of the alignment film 16 in the counter substrate 12.
  • a plurality of light-shielding films 28 are formed on the plastic substrate 22 of the counter substrate 12 so as to face the tips of the plurality of columnar spacers 20, respectively.
  • the light shielding film 28 can be made of, for example, a light-shielding metal material or resin material.
  • a common electrode 15 is formed on the plastic substrate 22 so as to cover the light shielding film 28.
  • An alignment film 16 is formed so as to cover the common electrode 15.
  • the TFT substrate 11 can be manufactured in the same manner as in the second embodiment.
  • the counter substrate 12 is formed with a plurality of shapes that cover the tip of the columnar spacer 20 by forming a light shielding material layer on the surface of the plastic substrate 22 and then performing photolithography and etching on the light shielding material layer.
  • a light shielding film 28 is formed.
  • the common electrode 15 is formed by forming a transparent conductive film such as an ITO film on the plastic substrate 22 so as to cover each light shielding film 28.
  • the alignment film 16 is formed on the surface of the common electrode 15 to manufacture the counter substrate 12.
  • the liquid crystal display device 1 is manufactured by bonding the counter substrate 12 and the TFT substrate 11 together through the liquid crystal layer 13 and a seal member (not shown).
  • the common electrode 15 since the light shielding film 28 is formed in the region facing the tip of the columnar spacer 20, the common electrode 15 receives stress concentration from the tip of the columnar spacer 20 and cracks in the common electrode 15. 10, since light that is about to pass through the cracks to the viewer side can be blocked by the light shielding film 28 as shown in FIG. 10, the viewer side in the vicinity of the columnar spacer 20 also in this embodiment. Light leakage to the can be suppressed.
  • Embodiment 5 of the Invention >> 11 to 13 show Embodiment 5 of the present invention.
  • FIG. 11 is an enlarged cross-sectional view showing the main structure of the liquid crystal display device 1 according to the fifth embodiment.
  • FIG. 12 is a cross-sectional view showing the TFT substrate 11 and the counter substrate 12 before being bonded to each other in the fifth embodiment.
  • FIG. 13 is an enlarged sectional view showing the vicinity of the columnar spacer 20 in the fifth embodiment.
  • the light shielding film 29 is formed not only on the counter substrate 12 but also on the TFT substrate 11 in the fourth embodiment.
  • a light shielding film 29 is formed on the plastic substrate 21 of the TFT substrate 11 in the present embodiment in a region where the columnar spacer 20 is formed.
  • the light shielding film 29 can be made of, for example, a metal material or a resin material having a light shielding property.
  • the pixel electrode 17 is formed on the plastic substrate 21 so as to cover the light shielding film 29.
  • An alignment film 18 is formed so as to cover the pixel electrode 17.
  • a region where the columnar spacer 20 is formed by forming a light shielding material layer on the surface of the plastic substrate 21 and then performing photolithography and etching on the light shielding material layer.
  • a plurality of light shielding films 29 are formed.
  • a TFT (not shown) is formed on the plastic substrate 21 by photolithography.
  • an interlayer insulating film (not shown) covering the TFT, an ITO film as a transparent conductive film material is formed on the surface of the interlayer insulating film.
  • a plurality of pixel electrodes 17 are formed by etching this ITO film.
  • a photosensitive resin film (not shown) is formed on the surface of the pixel electrode 17, and a plurality of columnar spacers 20 are formed by performing photolithography and etching on the photosensitive resin film.
  • the base ends of the plurality of columnar spacers 20 thus formed are opposed to the light shielding film 29, respectively.
  • the alignment film 18 is formed on the surface of the pixel electrode 17 to manufacture the TFT substrate 11.
  • the common electrode 15 since the light shielding film 28 is formed in the region facing the tip of the columnar spacer 20, the common electrode 15 receives stress concentration from the tip of the columnar spacer 20, and the common electrode 15 is cracked. Even if this occurs, the light to be transmitted from the crack to the viewer side can be blocked by the light shielding film 28 as shown in FIG. Further, since the light shielding film 29 is formed in the region facing the base end of the columnar spacer 20, even if the pixel electrode 17 receives stress concentration from the base end of the columnar spacer 20 and a crack occurs in the pixel electrode 17, As shown in FIG. 13, the light to be transmitted from the crack to the viewer side can be blocked by the light shielding film 28. Therefore, according to this embodiment, light leakage to the observer side in the vicinity of the columnar spacer 20 can be suppressed.
  • Embodiment 6 of the Invention 14 to 16 show Embodiment 6 of the present invention.
  • FIG. 14 is an enlarged cross-sectional view showing the main structure of the liquid crystal display device 1 according to the sixth embodiment.
  • FIG. 15 is a cross-sectional view showing the TFT substrate 11 and the counter substrate 12 before being bonded to each other in the sixth embodiment.
  • FIG. 16 is an enlarged sectional view showing the vicinity of the columnar spacer 20 in the sixth embodiment.
  • the columnar spacer 20 in the present embodiment is formed so that the cross section in the direction parallel to the plastic substrates 21 and 22 gradually increases from the substantially central portion toward both ends.
  • the columnar spacer 20 has a first spacer 20a formed on the TFT substrate 11 and a second spacer 20b formed on the counter substrate 12, as shown in FIGS.
  • the first spacer 20a the area of the front end surface on the counter substrate 12 side is smaller than the area of the base end surface on the TFT substrate 11 side.
  • the second spacer 20b the area of the front end surface on the TFT substrate 11 side is smaller than the area of the base end surface on the counter substrate 12 side.
  • the first spacer 20a and the second spacer 20b are arranged to face each other, and the tip end surfaces are formed in the same size and abut against each other, whereby the columnar spacer 20 is formed as a whole.
  • a TFT (not shown) is formed on the plastic substrate 21 by photolithography.
  • an interlayer insulating film (not shown) covering the TFT, an ITO film as a transparent conductive film material is formed on the surface of the interlayer insulating film.
  • a plurality of pixel electrodes 17 are formed by etching this ITO film.
  • a photosensitive resin film (not shown) is formed on the surface of the pixel electrode 17, and a plurality of first spacers 20a are formed by performing photolithography and etching on the photosensitive resin film. Thereafter, the alignment film 18 is formed on the surface of the pixel electrode 17 to manufacture the TFT substrate 11.
  • the common electrode 15 is formed by forming an ITO film on at least the entire display region on the surface of the plastic substrate 22.
  • a photosensitive resin film (not shown) is formed on the surface of the alignment film 16, and the photosensitive resin film is subjected to photolithography and etching.
  • a plurality of second spacers 20b are formed, and the counter substrate 12 is manufactured.
  • the area of both end surfaces of the columnar spacer 20 (that is, the end surface on the TFT substrate 11 side and the end surface on the counter substrate 12 side) is made larger than the cross section of the central portion of the columnar spacer 20. Therefore, as shown in FIG. 16, the stress applied to the common electrode 15 and the pixel electrode 17 from both ends of the columnar spacer 20 can be dispersed. Therefore, generation of cracks in the common electrode 15 and the pixel electrode 17 can be suppressed, and light leakage to the viewer side in the vicinity of the columnar spacer 20 can be suppressed.
  • Embodiment 7 of the Invention >> 17 to 19 show Embodiment 7 of the present invention.
  • FIG. 17 is an enlarged cross-sectional view showing the main structure of the liquid crystal display device 1 according to the seventh embodiment.
  • FIG. 18 is a cross-sectional view showing the TFT substrate 11 and the counter substrate 12 before being bonded to each other in the seventh embodiment.
  • FIG. 19 is an enlarged sectional view showing the vicinity of the columnar spacer 20 in the seventh embodiment.
  • the columnar spacer 20 in the present embodiment is made of a material having the same hardness as the constituent material of the plastic substrates 21 and 22, or a material having a lower hardness than the constituent material of the plastic substrates 21 and 22.
  • the columnar spacer 20 is formed, for example, on the surface of the pixel electrode 17 in the TFT substrate 11, and the tip thereof is in contact with the alignment film 16 of the counter substrate 12.
  • the material of the columnar spacer 20 for example, “Optomer NN series” (a product of JSR Corporation), which is a photosensitive material having a Young's modulus of about 11 GPa, is applied.
  • a plastic substrate obtained by adding about 50% glass cloth to an alicyclic epoxy resin having a rate of about 13 GPa can be applied.
  • plastic substrates 21 and 22 it is also possible to increase the hardness of the plastic substrates 21 and 22 to be the same as or larger than that of the columnar spacer 20 by vacuum-depositing a silicone hard coat such as SiO 2 on the plastic substrate.
  • the stress applied to the common electrode 15 and the pixel electrode 17 from both ends of the columnar spacer 20 spreads in the direction in which the columnar spacer 20 is parallel to the plastic substrates 21 and 22.
  • it can be made smaller by deforming. That is, according to the present embodiment as well, the occurrence of cracks in the common electrode 15 and the pixel electrode 17 due to the stress received from the columnar spacer 20 can be suppressed, so that light leakage to the viewer side in the vicinity of the columnar spacer 20 can be suppressed.
  • the first substrate is an active matrix substrate.
  • the present invention is not limited to this, and other materials such as a passive matrix substrate having a plurality of strip-shaped first transparent electrodes may be used as long as a transparent substrate and columnar spacers are formed. You may comprise by the board
  • both the TFT substrate 11 and the opposing substrate 12 consist of a flexible substrate
  • this invention is not limited to this,
  • at least one of the TFT substrate 11 and the opposing substrate 12 may be a flexible substrate
  • both the TFT substrate 11 and the counter substrate 12 may be configured by a non-flexible substrate such as a glass substrate.
  • the common electrode (second transparent electrode) 15 and the pixel electrode (first transparent electrode) 17 are not limited to ITO, and may be formed of other transparent conductive films such as IZO (Indium Zinc Oxide), for example.
  • IZO Indium Zinc Oxide
  • the columnar spacer 20 is formed on the TFT substrate 11 in each of the above embodiments.
  • the present invention is not limited to this, and the columnar spacer 20 may be formed on the counter substrate 12.
  • the present invention is not limited to Embodiments 1 to 7 described above, and the present invention includes a configuration in which these Embodiments 1 to 7 are appropriately combined.
  • the configuration of the columnar spacer 20 in the sixth and seventh embodiments may be applied as the columnar spacer 20 in the first to fifth embodiments.
  • liquid crystal display device 1 is a liquid crystal display device that performs a transmissive display having a backlight unit. Applicable to.
  • the present invention is useful for a liquid crystal display device having columnar spacers for maintaining the thickness of the liquid crystal layer constant.
  • Liquid crystal display device 11 TFT substrate (first substrate) 12 Counter substrate (second substrate) 13 Liquid crystal layer 15 Common electrode (second transparent electrode) 16 Alignment film 17 Pixel electrode (first transparent electrode) 18 Alignment film 20 Columnar spacer 21, 22 Plastic substrate 25, 26 opening

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  • Liquid Crystal (AREA)

Abstract

La présente invention concerne un dispositif d'affichage à cristaux liquides comprenant une pluralité d'espaceurs colonnaires qui sont formés sur un premier ou un second substrat et qui confèrent une valeur constante à l'épaisseur d'une couche de cristaux liquides. Une première électrode transparente est formée sur le premier substrat, du côté de la couche de cristaux liquides. Une seconde électrode transparente est formée sur le second substrat, également du côté de la couche de cristaux liquides. La première et/ou la seconde électrode transparente est pourvue d'ouvertures dans des régions dans lesquelles sont agencés les espaceurs colonnaires. Les parties d'extrémité des espaceurs colonnaires sont respectivement disposées à l'intérieur des ouvertures.
PCT/JP2011/005606 2010-10-08 2011-10-04 Dispositif d'affichage à cristaux liquides WO2012046442A1 (fr)

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JP2010-228862 2010-10-08
JP2010228862 2010-10-08

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WO2012046442A1 true WO2012046442A1 (fr) 2012-04-12

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114280852A (zh) * 2021-12-31 2022-04-05 惠科股份有限公司 显示面板及显示装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003302640A (ja) * 2002-04-09 2003-10-24 Rohm Co Ltd 液晶パネル
JP2006338011A (ja) * 2005-06-01 2006-12-14 Samsung Electronics Co Ltd 液晶表示パネルとその製造方法
JP2007233059A (ja) * 2006-03-01 2007-09-13 Epson Imaging Devices Corp 液晶表示装置及びその製造方法
JP2009122644A (ja) * 2007-10-23 2009-06-04 Toshiba Matsushita Display Technology Co Ltd 液晶表示パネル

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003302640A (ja) * 2002-04-09 2003-10-24 Rohm Co Ltd 液晶パネル
JP2006338011A (ja) * 2005-06-01 2006-12-14 Samsung Electronics Co Ltd 液晶表示パネルとその製造方法
JP2007233059A (ja) * 2006-03-01 2007-09-13 Epson Imaging Devices Corp 液晶表示装置及びその製造方法
JP2009122644A (ja) * 2007-10-23 2009-06-04 Toshiba Matsushita Display Technology Co Ltd 液晶表示パネル

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114280852A (zh) * 2021-12-31 2022-04-05 惠科股份有限公司 显示面板及显示装置

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