JP2013054391A - Liquid crystal display device - Google Patents

Abstract

An object of the present invention is to prevent peeling of an alignment film.
A liquid crystal display device includes a first alignment film formed on a surface of a first substrate facing the second substrate and a spacer, and a first alignment of the second substrate. A pedestal 142 provided on the surface facing the substrate 118 and a second alignment film 120 formed on the surface of the second substrate 120 facing the first substrate 118 and on the pedestal 142 are included. The pedestal 142 has an island shape and includes at least one thin portion 76 and a plurality of thick portions 78. The spacer 134 faces at least one thin portion 76 and two or more thick portions 78. A portion on the thick portion 78 of the second alignment film 148 contacts a portion on the spacer 134 of the first alignment film 136. The portion on the thin portion 76 of the second alignment film 148 is not in contact with the portion on the spacer 134 of the first alignment film 136.
[Selection] Figure 4

Description

  The present invention relates to a liquid crystal display device.

  The liquid crystal panel has a pair of substrates, and a spacer is provided on one of the substrates in order to maintain a gap (liquid crystal sealing space) between them (see Patent Documents 1 to 3).

JP 2005-345819 A JP 2005-107494 A JP 2007-156221 A

  An alignment film is formed on the surfaces of each substrate facing each other, and the alignment film on the spacer contacts the alignment film on the other substrate. Contact may cause peeling of the alignment film. When the alignment film peels off and floats in the liquid crystal, minute bright spots are generated due to light reflection. An object of the present invention is to reduce the peeling area of the alignment film.

  (1) The liquid crystal display device according to the present invention includes first and second substrates facing each other, a spacer provided on a surface of the first substrate facing the second substrate, and the first substrate. A first alignment film formed on the surface facing the second substrate and the spacer, a pedestal provided on a surface of the second substrate facing the first substrate, and A second alignment film formed on the surface of the second substrate facing the first substrate and on the pedestal; and a liquid crystal disposed between the first and second alignment films. The pedestal is island-shaped, and includes at least one thin portion and a plurality of thick portions, and the spacer includes the at least one thin portion and two or more thick portions. Opposite, the part on the thick part of the second alignment film is the part on the spacer of the first alignment film. Touch to the portions on the thin portion of the second alignment film, characterized in that it is a non-contact with the part on the spacer of the first alignment layer. According to the present invention, since the first and second alignment films are in contact with only a part of the pedestal (thick portion) and the spacer, the contact area can be reduced, and the first or second alignment film can be reduced. The alignment film can be prevented from peeling off. Since a plurality of thick portions are provided, even if the spacer is dropped from any one of the thick portions, it is supported by the other thick portions, so the gap between the first and second substrates is reduced. Can be secured.

  (2) In the liquid crystal display device, the pedestal includes a plurality of first layers and at least one second layer having a portion that overlaps each of the plurality of first layers, and the thin portion includes: A portion of the plurality of first layers excluding an overlapping portion with the at least one second layer, and a portion of the at least one second layer excluding an overlapping portion with the plurality of first layers; The thick portion may be an overlapping portion of the plurality of first layers and the at least one second layer.

  (3) In the liquid crystal display device, the at least one second layer has a strip shape, and each of the plurality of first layers has a strip shape and intersects the at least one second layer. It may be characterized by extending along.

  (4) In the liquid crystal display device, the pedestal includes a plurality of the second layers, and the plurality of first layers and the plurality of second layers are arranged in a lattice shape. Good.

  (5) The liquid crystal display device according to the present invention is provided on the first and second substrates facing each other and on the surface of the first substrate facing the second substrate, and each of the top surfaces is a first surface. A first alignment film formed on the surface of the first substrate facing the second substrate and on the plurality of spacers, and the first substrate of the second substrate. And a plurality of pedestals each having a second surface on the top, and formed on the surface of the second substrate facing the first substrate and on the plurality of pedestals. A second alignment film, a liquid crystal disposed between the first and second alignment films, and a seal that fixes the end of the first substrate and the end of the second substrate to each other Each of the plurality of pedestals is island-shaped, and the second surface is smaller than the first surface, The first surface and the second surface oppose each other, the first alignment film has a first portion located on the first surface, and the second alignment film includes the first surface and the second surface. A plurality of spacers and a plurality of pedestals facing each other, wherein the plurality of spacers and the plurality of bases are opposed to each other. A first group of spacers and pedestals comprising a spacer and a pedestal; and a second group of spacers and pedestals comprising at least one other set of the spacer and the pedestal facing each other; The spacer and the base of the second group are located farther from the end portions of the first and second substrates than the spacer and the base of the first group, and the second group The first surface of the spacer of It is larger than serial the first surface of the spacer of the first group. According to the present invention, since the second surface of the pedestal is smaller than the first surface of the spacer, the contact area between the first and second alignment films can be reduced, and the first or second alignment film Can be prevented. In addition, since the first and second substrates are fixed at the end portions, the deviation between the two is small at the end portions and large at the center. In the present invention, the first spacers in the second group apart from the end portions are used. Since the surface is larger than the first surface of the spacer in the first group close to the end, the spacer is less likely to fall off the pedestal.

  (6) In the liquid crystal display device according to the present invention, the second surface of the pedestal of the second group is larger than the second surface of the pedestal of the first group. Good.

It is a disassembled perspective view which shows the liquid crystal display device which concerns on a reference example. It is sectional drawing which shows a part of liquid crystal display device. It is a top view explaining the relative position of a spacer and a base. 4A is a plan view for explaining the spacer and the pedestal of the liquid crystal display device according to the first embodiment of the present invention, and FIG. 4B is the spacer and the pedestal shown in FIG. FIG. 4 is a sectional view taken along line IVB-IVB. It is a figure which shows the state which the spacer shifted | deviated. It is a top view explaining the liquid crystal display device which concerns on the modification of the 1st Embodiment of this invention. It is a top view explaining the liquid crystal display device which concerns on the 2nd Embodiment of this invention. It is a partially expanded plan view explaining the liquid crystal display device which concerns on the 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[Reference example]
FIG. 1 is an exploded perspective view showing a liquid crystal display device according to a reference example. The liquid crystal display device includes a liquid crystal panel 10. Polarizing plates 12 are disposed on both surfaces of the liquid crystal panel 10. The liquid crystal display device has a backlight 14. One polarizing plate 12 is interposed between the liquid crystal panel 10 and the backlight 14. A flexible wiring board 16 is attached to the liquid crystal panel 10.

  FIG. 2 is a cross-sectional view showing a part of the liquid crystal display device. The liquid crystal display device has first and second substrates 18 and 20 facing each other. The first and second substrates 18 and 20 are part of the liquid crystal panel 10.

  One of the first and second substrates 18 and 20 (the first substrate 18 in FIG. 2) has a black matrix 22 and a plurality of colors (for example, three colors of red (R), green (G), and blue (B)). The color filter substrate including the colored layers 24, 26, and 28). One pixel includes a plurality of subpixels composed of colored layers 24, 26, and 28 of a plurality of colors. The colored layers 24, 26, and 28 are covered with an overcoat layer 30.

  The other of the first and second substrates 18 and 20 (second substrate 20 in FIG. 2) is a TFT substrate (or array substrate) including TFTs (Thin Film Transistors) and pixel electrodes (not shown).

  A plurality of spacers (columnar spacers) 34 each having a first surface 32 on the top are provided on the surface of the first substrate 18 facing the second substrate 20. The shape of the spacer 34 is a truncated cone in the reference example, but may be a truncated pyramid or a column (such as a cylinder or a prism). The plurality of spacers 34 may be disposed so as to face each of the colored layers 24, 26, and 28 of the plurality of colors. However, in the example of FIG. It is. Further, although the plurality of spacers 34 are arranged to face all the blue colored layers 28, they may be arranged to avoid some colored layers 28. The spacer 34 can be formed of resin, and photolithography can be applied to the formation process.

  A first alignment film 36 is formed on the surface of the first substrate 18 facing the second substrate 20 (for example, the surface of the overcoat layer 30) and the plurality of spacers 34. The first alignment film 36 has a first portion 38 located on the first surface 32 of the spacer 34.

  On the surface of the second substrate 20 facing the first substrate 18, a plurality of pedestals 42 each having a second surface 40 are provided on the top. The pedestal 42 is formed of a plurality of layers. For example, the base 42 may be configured by forming a second layer 46 having a band shape on the first layer 44 having a band shape so as to intersect (for example, orthogonally cross) the first layer 44. According to this structure, the overlapping portion of the first layer 44 and the second layer 46 has the same size even if they are slightly shifted. For example, the first layer 44 may be formed from silicon and the second layer 46 may be formed from aluminum by CVD.

  A second alignment film 48 is formed on the surface of the second substrate 20 facing the first substrate 18 and on the plurality of pedestals 42. The second alignment film 48 has a second portion 50 located on the second surface 40 of the pedestal 42. The second surface 40 of the pedestal 42 is smaller than the first surface 32 of the spacer 34. The first surface 32 of the spacer 34 and the second surface 40 of the pedestal 42 are positioned so as to face each other. The first and second portions 38 and 50 of the first and second alignment films 36 and 48 are in contact with each other. The spacer 34 is compressed between the first and second substrates 18 and 20 in a direction in which both approach each other. Thereby, the contact state of the first and second portions 38 and 50 of the first and second alignment films 36 and 48 is ensured. A liquid crystal 52 is sealed between the first and second alignment films 36 and 48.

  According to the reference example, since the second surface 40 of the pedestal 42 is smaller than the first surface 32 of the spacer 34, the contact area between the first and second alignment films 36 and 48 can be reduced. The peeling area of the first or second alignment film 36, 48 can be reduced.

FIG. 3 is a plan view for explaining the relative positions of the spacer and the pedestal. The plurality of spacers 34 and the plurality of pedestals 42 include a first group of spacers 61 and a pedestal 71 including at least one set of spacers 34 and pedestals 42 facing each other, and at least one other set of spacers 34 facing each other. And a second group of spacers 62 and a pedestal 72 comprising the pedestal 42. The spacer 61 and the pedestal 71 of the first group, and the spacer 62 and the pedestal 72 of the second group, in different directions (for example opposite directions along the first straight line L _1), the center of the first surface 32 And the center of the second surface 40 are arranged so as to be offset.

  According to the reference example, the first group and the second group 18 are different in the direction in which the spacer 34 and the pedestal 42 (the first surface 32 and the second surface 40) are shifted from each other in the first group and the second group. 20, even if one of the spacers 34 is displaced from the pedestal 42, the other spacers 34 remain on the pedestal 42, and the gap between the first and second substrates 18, 20 is reduced. Can be secured.

The plurality of spacers 34 and the plurality of pedestals 42 include a third group of spacers 63 and a pedestal 73 including at least one other pair of spacers 34 and the pedestal 42 facing each other, and at least one other set of the other facing each other. And a fourth group of spacers 64 and pedestals 74 comprising spacers 34 and pedestals 42. The third spacer 63 and the pedestal 73 of the group, the spacer 64 and the pedestal 74 of the fourth group, different directions (e.g., first cross the straight line L ₁ at 75 degrees or more and 90 degrees or less angle (e.g., perpendicular ) to the second straight line L ₂ opposite directions along a) to, are arranged so that the center and the center of the second surface 40 of the first surface 32 is deviated.

  According to the reference example, in the first to fourth groups, the direction in which the spacer 34 and the pedestal 42 (the first surface 32 and the second surface 40) are shifted differs in four directions, so the first and second substrates 18 are different. , 20 is displaced in any direction, any one of the spacers 34 remains on the pedestal 42, and a gap between the first and second substrates 18, 20 can be secured.

[First embodiment]
4A is a plan view for explaining the spacer and the pedestal of the liquid crystal display device according to the first embodiment of the present invention, and FIG. 4B is the spacer and the pedestal shown in FIG. FIG. 4 is a sectional view taken along line IVB-IVB. In the present embodiment, the shape of the base 142 is different from the base 42 of the reference example.

  The pedestal 142 has at least one thin portion 76 and a plurality of thick portions 78. The pedestal 142 includes a plurality of first layers 144 and at least one second layer 146 having a portion overlapping the first layer 144. Any of the first and second layers 144 and 146 may be on, but in this embodiment, the first layer 144 is formed over the second substrate 120, and the second substrate 120 and the second layer 120 are formed. A second layer 146 is formed on the first layer 144.

  The thin portion 76 includes a portion of the first layer 144 excluding an overlapping portion with the second layer 146 and a portion of the second layer 146 excluding an overlapping portion with the first layer 144. The thick portion 78 includes an overlapping portion of the first layer 144 and the second layer 146. The first and second layers 144 and 146 have a band shape and extend along directions intersecting each other.

  The spacer 134 formed on the first substrate 118 is opposed to at least one thin portion 76 and two or more thick portions 78. A portion on the thick portion 78 of the second alignment film 148 contacts a portion on the spacer 134 of the first alignment film 136. The portion on the thin portion 76 of the second alignment film 148 is not in contact with the portion on the spacer 134 of the first alignment film 136.

  According to the present embodiment, since the first and second alignment films 136 and 148 are in contact with only a part of the pedestal 142 (thick portion 78) and the spacer 134, the contact area can be reduced. In addition, the peeling area of the first or second alignment film 136, 148 can be reduced.

  And since the some thick part 78 is provided, even if the spacer 134 drops | omits from any one thick part 78 (refer to the spacer 134 shown with the dashed-two dotted line of FIG. 4 (A)), other Since it is supported by the thick portion 78, a gap between the first and second substrates 118 and 120 can be secured. FIG. 5 is a diagram illustrating a state in which the spacer 134 is displaced.

  About the other structure and manufacturing method of this Embodiment, the content demonstrated by the reference example is applicable.

[Modification]
FIG. 6 is a plan view for explaining a liquid crystal display device according to a modification of the first embodiment of the present invention. In this modification, the shape of the base 242 is different from that of the first embodiment.

  The pedestal 242 includes a plurality of second layers 246. The plurality of first layers 244 and the plurality of second layers 246 are arranged in a lattice pattern. According to this, more thick portions 278 can be formed, so that even if the spacer 234 is largely displaced as shown by a two-dot chain line, it does not fall off from the base 242. About the other structure, the content demonstrated in the column of the said 1st Embodiment corresponds.

[Second Embodiment]
FIG. 7 is a plan view for explaining a liquid crystal display device according to the second embodiment of the present invention. FIG. 8 is a partially enlarged plan view for explaining a liquid crystal display device according to the second embodiment of the present invention.

  The end portion of the first substrate 318 and the end portion of the second substrate 320 are fixed to each other by a seal 80. This also applies to the first embodiment.

  The liquid crystal display device has a plurality of spacers and a plurality of pedestals. The plurality of spacers and the plurality of pedestals include a first group of spacers 81 and pedestals 91 including at least one pair of spacers and pedestals facing each other, and a first group of at least one pair of spacers and pedestals facing each other. And two groups of spacers 82 and pedestals 92. The region 316 where the second group of spacers 82 and the pedestal 92 are formed is larger than the region 314 where the first group of spacers 81 and the pedestal 91 are formed in the first and second substrates 318 and 320. Located away from the edge (near the center).

  As shown in FIG. 8, the first surface of the second group of spacers 82 is larger than the first surface of the first group of spacers 81. The second surface of the second group of pedestals 92 is larger than the second surface of the first group of pedestals 91. Since the island-shaped pedestal 92 is smaller than the spacer 82, the area where the alignment film is peeled can be reduced. Since the island-shaped base 91 is smaller than the spacer 81, the area where the alignment film is peeled can be reduced.

  According to the present embodiment, since the first and second substrates 318 and 320 are fixed at the end portions, the deviation between them is small at the end portions and large at the center, but in this embodiment, they are separated from the end portions. In addition, since the first surface of the spacer 82 in the second group is larger than the first surface of the spacer 81 in the first group close to the end portion, the spacer 81 is unlikely to fall off the pedestal 92. About the other structure and manufacturing method of this Embodiment, the content demonstrated by the reference example is applicable.

  The present invention is not limited to the embodiment described above, and various modifications are possible. For example, the configuration described in the embodiment can be replaced with a substantially the same configuration, a configuration that exhibits the same operational effects, or a configuration that can achieve the same purpose. It is also possible to use a combination of the first and second embodiments.

L ₁ first straight line, L ₂ second straight line, 10 liquid crystal panel, 12 polarizing plate, 14 backlight, 16 flexible wiring board, 18 first board, 20 second board, 22 black matrix, 24, 26 , 28 Colored layer, 30 Overcoat layer, 32 First surface, 34 Spacer, 36 First alignment film, 38 First portion, 40 Second surface, 42 Base, 44 First layer, 46 Second 48, second alignment film, 50 second portion, 52 liquid crystal, 61 first group spacer, 62 second group spacer, 63 third group spacer, 64 fourth group spacer , 71 1st group pedestal, 72 2nd group pedestal, 73 3rd group pedestal, 74 4th group pedestal, 76 Thin part, 78 Thick part, 80 seal, 81 1st group of Spacer, 82 second group spacer, 91 first group pedestal, 92 second group pedestal, 118 first substrate, 120 second substrate, 134 spacer, 136 first alignment film, 142 pedestal , 144 first layer, 146 second layer, 148 second alignment film, 234 spacer, 242 pedestal, 244 first layer, 246 second layer, 278 thick part, 314 region, 316 region, 318 First substrate, 320 second substrate.

Claims (6)

Opposing first and second substrates;
A spacer provided on a surface of the first substrate facing the second substrate;
A first alignment film formed on the surface of the first substrate facing the second substrate and on the spacer;
A pedestal provided on a surface of the second substrate facing the first substrate;
A second alignment film formed on the surface of the second substrate facing the first substrate and on the pedestal;
A liquid crystal disposed between the first and second alignment layers;
Including
The pedestal is island-shaped and has at least one thin part and a plurality of thick parts,
The spacer is opposed to the at least one thin portion and the two or more thick portions,
A portion on the thick portion of the second alignment film is in contact with a portion on the spacer of the first alignment film;
The liquid crystal display device, wherein a portion of the second alignment film on the thin portion is not in contact with a portion of the first alignment film on the spacer. The liquid crystal display device according to claim 1,
The pedestal includes a plurality of first layers, and at least one second layer having a portion overlapping each of the plurality of first layers,
The thin portion is an overlapping portion of the plurality of first layers excluding an overlapping portion with the at least one second layer and an overlapping portion of the at least one second layer with the plurality of first layers. And a part excluding
The liquid crystal display device, wherein the thick portion includes an overlapping portion of the plurality of first layers and the at least one second layer. The liquid crystal display device according to claim 2,
The at least one second layer is strip-shaped;
The plurality of first layers each have a strip shape and extend along a direction intersecting the at least one second layer. The liquid crystal display device according to claim 3,
The pedestal includes a plurality of the second layers,
The liquid crystal display device, wherein the plurality of first layers and the plurality of second layers are arranged in a lattice pattern. Opposing first and second substrates;
A plurality of spacers provided on a surface of the first substrate facing the second substrate, each having a first surface on the top;
A first alignment film formed on the surface of the first substrate facing the second substrate and on the plurality of spacers;
A plurality of pedestals provided on a surface of the second substrate facing the first substrate, each having a second surface on the top;
A second alignment film formed on the surface of the second substrate facing the first substrate and on the plurality of pedestals;
A liquid crystal disposed between the first and second alignment layers;
A seal that fixes an end of the first substrate and an end of the second substrate to each other;
Including
Each of the plurality of pedestals is island-shaped,
The second surface is smaller than the first surface;
The first surface and the second surface are opposed to each other;
The first alignment film has a first portion located on the first surface,
The second alignment film has a second portion located on the second surface,
The first portion and the second portion are in contact;
The plurality of spacers and the plurality of pedestals include at least one set of the spacers and the pedestal facing each other, and the first group of the spacers and the pedestals, and at least one other set of the spacers facing each other. And a second group of the spacer and the pedestal comprising the pedestal,
The spacer and the pedestal of the second group are located farther from the end portions of the first and second substrates than the spacer and the pedestal of the first group;
The liquid crystal display device, wherein the first surface of the spacer of the second group is larger than the first surface of the spacer of the first group. The liquid crystal display device according to claim 5,
The liquid crystal display device, wherein the second surface of the pedestal of the second group is larger than the second surface of the pedestal of the first group.

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