JP2011123092A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device, restraining an increase in an aperture ratio and mixed color. <P>SOLUTION: The liquid crystal display device 10 includes a first substrate and a second substrate disposed opposite to each other with a liquid crystal layer held between them. The first substrate includes a plurality of scanning lines and signal lines 14 formed to intersect each other in the mutually insulated state and sub-pixels partitioned by the scanning lines and the signal lines 14; and the second substrate includes a color filter layer 31 formed in each sub-pixel partitioned by the scanning line and the signal line 14 in a plan view. The first substrate includes a transparent electrode. The color filter layer 31 formed in each sub-pixel has a non-colored region 42, and the non-colored region 42 is formed in a position partly overlapping the transparent electrodes located on both sides across the signal line 14 in a plan view. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device that achieves a high aperture ratio and suppresses color mixing.

Since the liquid crystal display device has an advantage that can be reduced in thickness, weight and size,
It is widely used as a display device for various electronic devices such as televisions, personal computers, mobile phones, and other portable information terminals. This liquid crystal display device has a pair of array substrates and color filter substrates formed from glass plates, etc., and a frame seal material is disposed on the outer periphery between the pair of substrates to form a predetermined space between the substrates. The liquid crystal is sealed in this space.

The display by the liquid crystal display device is desired to be clear, and therefore various improvements have been made to the color filter provided on the color filter substrate. For example, Patent Document 1 below discloses a liquid crystal display panel with improved color reproducibility and color characteristics. According to the invention of the following Patent Document 1, by forming the color filters of the first color, the second color and the third color in the groove formed in the transparent substrate, the utilization factor of the material and the flatness of the color filter layer It is supposed to improve. In addition, the colored resin composition used for forming the color filter layer has a remarkably small use ratio of the photosensitizer and the binding resin to the pigment, so that color reproducibility and color characteristics are improved. Patent Document 2 below discloses an invention of a method for producing a color filter for the purpose of improving the formation efficiency of the color filter. According to the invention of the following Patent Document 2, protrusions caused by overlapping portions of the color filter layers can be easily removed, and thus the manufactured color filter has a smooth surface. When this color filter is incorporated into a liquid crystal display panel, the surface of the color filter is smooth, so that it is possible to suppress a decrease in manufacturing yield due to a short circuit between the pixel electrode and the common electrode, and display quality defects caused at the protrusions. It is said that there will be an effect that will disappear.

On the other hand, liquid crystal display devices are further required to have a high transmittance and high contrast display screen. However, in the inventions disclosed in Patent Documents 1 and 2 below, a black matrix formed of a metallic material or the like for suppressing color mixture is arranged between the color filters. Since the light is shielded, it has been difficult to sufficiently cope with the high transmittance and high contrast of the display screen. As a method for solving these problems, a technique for increasing the aperture ratio than the conventional one is known. As a method for increasing the aperture ratio, for example, Patent Document 3 below discloses a technique for forming a light shielding film by stacking color filters of different colors instead of using a metal film as the light shielding film. Yes. That is, according to the liquid crystal display device disclosed in Patent Document 3 below, when the red, green, and blue color filter material layers are sequentially formed at predetermined positions, the end portions of the color filter materials of different colors adjacent to each other are overlapped. In addition, a light shielding layer is formed. According to the invention disclosed in Patent Document 3 below, if the laminated color filter is a light shielding film, the width can be narrower than that of a conventional light shielding film formed of metal or the like, so that a high aperture ratio can be achieved. ing.

JP-A-9-171176 JP-A-8-095024 JP 2000-310791 A

However, if the laminated color filter is used as a light shielding film, the aperture ratio of the display screen can be increased. However, on the other hand, light that has passed through the color filter of the own pixel and the color filter of the adjacent pixel is mixed and a color mixing phenomenon occurs. . This color mixing phenomenon occurs due to a shift that occurs when the array substrate and the color filter substrate are bonded together. The decrease in chromaticity due to this color mixture is shown in FIG.
This will be described using the -y chromaticity coordinate system. In FIG. 8, when the design values of each color are R, G, and B, the triangles having the vertices of R, G, and B are NTSC (National Television System Committe).
The range of colors that can be reproduced in e) is shown, and when different colors are mixed with these design values,
The respective values are RG, RB, GR, GB, BG and BR, and the respective values of x and y
The value of decreases. As a result, since the portion surrounded by the triangle shown in FIG. 8 is reduced, the range of colors that can be reproduced by NTSC is also reduced. Also, as shown in FIG.
When color filters of different colors are mixed, the NTSC ratio decreases as the protrusion rate of the color and the decrease rate of the NTSC ratio increase, so that clear display becomes difficult.

Therefore, as a result of various studies on the configuration for suppressing color mixing, the present inventors have formed a non-colored region in which no color exists in the color filter layer, thereby causing a shift in bonding the substrates. However, it has been found that color mixing can be suppressed, and the present invention has been completed.

That is, an object of the present invention is to provide a liquid crystal display device that suppresses color mixing and has a high aperture ratio by forming a non-colored region in a color filter layer formed on a color filter substrate.

In order to achieve the above object, the liquid crystal display device of the present invention comprises:
A first substrate and a second substrate disposed opposite to each other with a liquid crystal layer interposed therebetween;
The first substrate includes
A plurality of scanning lines and signal lines formed so as to intersect with each other while being insulated from each other, and sub-pixels partitioned by the scanning lines and signal lines,
The second substrate includes a color filter layer formed for each sub-pixel defined by the scanning line and the signal line in a plan view.
In the liquid crystal display device provided with a transparent electrode on the first substrate,
The color filter layer formed for each sub-pixel has a non-colored region,
The non-colored region is formed at a position partially overlapping with the transparent electrodes located on both sides of the signal line in plan view.

In the liquid crystal display device of the present invention, a non-colored region is provided in each color filter layer formed in each sub-pixel of the second substrate. This non-colored region is provided on both sides of the signal line formed on the first substrate. For this reason, even when the first substrate and the second substrate are bonded to each other, the color filter layer does not shift to the adjacent pixel electrode side even if the first substrate and the second substrate are deviated from the design position. Therefore, according to the liquid crystal display device of the present invention, even when the first substrate and the second substrate are bonded to each other, the color mixture can be suppressed and a high aperture ratio of the display screen can be achieved even if the design substrate is displaced from the design position. be able to.

In the liquid crystal display device of the present invention, the thickness of the color filter layer is increased in proportion to the area of the non-colored region, and the increase amount is preferably different for different colors of the color filter layer. .

In the liquid crystal display device of the present invention, a non-colored region is provided in the color filter layer of the color filter substrate in order to suppress color mixing and the like. Is required. However, when the width of the non-colored region is widened, the color emitted from the color filter layer is thinned. Therefore, according to the liquid crystal display device of the present invention, the thickness of the color filter layer is increased in proportion to the area of the non-colored region of the color filter layer. can do. In addition, since the degree of color fading varies depending on each color, by adjusting the thickness of the color filter layer according to each color, it is possible to efficiently suppress the fading of each color and achieve a good white balance. Will be able to. In order to prevent the color from becoming thin, it is also possible to adjust the pigment concentration for forming the color filter layer in proportion to the area of the non-colored region instead of adjusting the thickness of the color filter layer. . Further, both the thickness of the color filter layer and the pigment concentration of the color filter material may be adjusted.

In the liquid crystal display device according to the aspect of the invention, the non-colored region may have an end portion of the colored region at a position equidistant from each end portion of the signal line, with both end portions of the signal line as base points. It is preferable to be formed as described above.

According to the liquid crystal display device of the present invention, the distance to each end of the non-colored region provided in the color filter layer of the second substrate is made equal to the signal line formed on the first substrate. As a result, color mixing when the first substrate and the second substrate are combined can be most suppressed.

In the liquid crystal display device of the present invention, when the non-colored region is X, the distance from each end of the signal line to the end of the non-colored region is defined from both ends of the signal line as a base point. It is preferable that the signal line is formed on both sides to a position separated by 0 <X ≦ 2.0 μm.

In the liquid crystal display device of the present invention, the non-colored region provided in the color filter layer is formed in a range in which the distance from each end of the signal line to the end of the non-colored region does not exceed 2.0 μm.
When this distance exceeds 2.0 μm, the non-colored region becomes wide. Then, it is necessary to considerably increase the thickness of the color filter layer. However, since the thickness of the resin material for forming the color filter layer is limited, if it is too thick, it may be difficult to manufacture. Also,
Even if it can be manufactured, if the color filter layer is too thick, the thick color filter layer is difficult to transmit light, which may make color display difficult. Therefore, according to the liquid crystal display device of the present invention, it is possible to form a non-colored region within a range that does not cause a problem in color display.

In the liquid crystal display device of the present invention, it is preferable that the distance X from each end of the signal line in the non-colored region is 0.5 ≦ X ≦ 2.0 μm.

In the liquid crystal display device of the present invention, the non-colored region provided in the color filter layer is formed in a range where the distance from each end of the signal line to the end of the non-colored region exceeds 0.5 μm. When this distance is less than 0.5 μm, it is difficult to uniformly cope with the deviation at the time of bonding the substrates, and it is difficult to suppress color mixing. Therefore, according to the liquid crystal display device of the present invention,
It is possible to cope with a shift at the time of bonding the substrates, and to suppress color mixing. The distance X from each end of the best signal line to the end of the non-colored region is 1.25 μm.

In the liquid crystal display device of the present invention, it is preferable that the non-colored region is formed with different areas for different colors of the color filter layer.

In the liquid crystal display device of the present invention, the non-colored area is made different for each color in consideration of the extent to which the color is thinned by providing the color filter layer with the non-colored area. for that reason,
According to the liquid crystal display device of the present invention, it is not necessary to change the thickness of the color filter layer for each color, so that the color filter layer can be easily manufactured.

In the liquid crystal display device of the present invention, the transparent electrode formed for each sub-pixel defined by the scanning line and the signal line is a pixel electrode on the first substrate, and the pixel electrode is mutually connected. It is preferable to include a common electrode formed in an electrically insulated state.

According to the liquid crystal display device of the present invention, it is possible to provide a liquid crystal display device that can suppress color mixing even when the substrate is bonded and can operate in a horizontal electric field mode having a high aperture ratio of the display screen. Can do.

In the liquid crystal display device of the present invention, it is preferable that the signal line bends in a “<” shape.

In the liquid crystal display device of the present invention, since the signal lines are bent in a “<” shape, a wide viewing angle can be realized. However, it is necessary to form a light shielding layer in accordance with the bent signal lines. . Therefore, since the light shielding layer is bent and formed, a deviation from the design value is likely to occur, and as a result, a deviation at the time of bonding the substrates is likely to occur. However, according to the liquid crystal display device of the present invention, since the color filter layers on both sides of the signal line are provided with non-colored regions, even if a shift occurs when the substrates are bonded, the color mixture and the aperture ratio are reduced. It is possible to provide a wide viewing angle liquid crystal display device in which the above is suppressed.

In the liquid crystal display device of the present invention, the transparent electrode includes the first substrate and the second substrate.
It is preferable that one layer is formed on each of the substrates.

According to the liquid crystal display device of the present invention, it is possible to provide a vertical electric field type liquid crystal display device that can suppress color mixing even when a shift occurs when the substrates are bonded together and has a high aperture ratio of the display screen. .

In the liquid crystal display device of the present invention, it is preferable that a reflective layer is formed on a partial region of the sub-pixel on the first substrate.

According to the liquid crystal display device of the present invention, it is possible to provide a transflective liquid crystal display device having a high aperture ratio of a display screen that can suppress color mixing even when a shift occurs when the substrates are bonded. .

Further, in the liquid crystal display device of the present invention, the sub-pixel arrangement is formed in a delta arrangement or a mosaic arrangement, and the non-colored region is an end portion of the scanning line with the end portion of the scanning line as a base point. To the end of the non-colored region can be equidistant.

According to the liquid crystal display device of the present invention, even if the sub-pixels are formed in a delta arrangement (triangle) or a mosaic (diagonal) arrangement, the non-colored regions are provided on both sides of the scanning line. Even if a shift occurs when the first and second substrates are bonded, color mixing can be suppressed, and a liquid crystal display device having a display screen with a high aperture ratio can be provided.

It is a top view of the liquid crystal display device common to Embodiments 1-6 of this invention. FIG. 3 is an enlarged plan view of three pixels seen through a color filter substrate of the liquid crystal display device of Embodiment 1. It is sectional drawing cut | disconnected by the III-III line of FIG. 3 is a plan view of three pixels viewed from the color filter substrate side of Embodiment 1. FIG. It is sectional drawing in the VV line | wire of FIG. FIG. 5 is a plan view corresponding to FIG. 4 when a deviation occurs in the first embodiment. It is sectional drawing in the VII-VII line of FIG. It is an xy chromaticity coordinate system indicating chromaticity. It is a graph which shows the NTSC ratio decreasing rate with respect to a color protrusion rate. It is a graph which shows the relationship between the width | variety of a non-colored area | region, and the film thickness of a color filter layer. 6 is a plan view showing a liquid crystal display device of Embodiment 2. FIG. 12A is a plan view showing the liquid crystal display device of Embodiment 3, and FIG. 12B is a cross-sectional view taken along the line XIIB-XIIB of FIG. 12A. 6 is a plan view showing a liquid crystal display device of Embodiment 4. FIG. FIG. 14A is a plan view showing the liquid crystal display device of Embodiment 5, and FIG. 14B is a plan view showing the liquid crystal display device of Embodiment 6. 15A is a plan view showing a conventional liquid crystal display device, and FIG. 15B is a cross-sectional view taken along line XVB-XVB in FIG. 15A. FIG. 16A is a plan view showing a shift generated in the conventional liquid crystal display device, and FIG. 16B is a cross-sectional view taken along line XVIB-XVIB in FIG. 16A.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the embodiment and the drawings. However, the embodiment described below is described by taking a horizontal electric field type FFS mode liquid crystal display device as an example to embody the technical idea of the present invention, and the present invention is described in this embodiment. It is not intended to be specific to an FFS mode liquid crystal display, and the invention is equally applicable to other embodiments within the scope of the claims. In each drawing used for the description in this specification, each layer and each member are displayed in different scales so that each layer and each member can be recognized on the drawing. However, it is not necessarily displayed in proportion to the actual dimensions.

[Embodiment 1]
First, the configuration of the FFS mode liquid crystal display device 10 according to the first embodiment will be described with reference to FIG. As shown in FIG. 1, the liquid crystal display device 10 according to the first embodiment has a color on an array substrate 11 in which various wirings are formed on a first transparent substrate 12 made of glass or the like and a second transparent substrate 29 made of glass or the like. A color filter substrate 28 on which a filter or the like is formed is disposed to face the filter. The array substrate 11 and the color filter substrate 28 are formed by sealing a liquid crystal 35 in a space formed by the sealing material 36 and bonding the liquid crystal 35 to the sealing material 36. Further, a portion surrounded by the sealing material 36 and filled with the liquid crystal 35 is a display region 37, and the outside of the display region 37 is a non-display region 38 (also referred to as a frame region). The array substrate 11
Is used that has a slightly larger size than the color filter substrate 28 so that a protruding portion of a predetermined space is formed when the color filter substrate 28 is opposed to the color filter substrate 28.
This overhanging portion is a mounting region 12a in which a driver IC 41 for driving the liquid crystal 35 and the like are disposed. In the liquid crystal display device 10 according to the first embodiment, an example in which the liquid crystal injection port 39 is formed by the sealing material 36 and the liquid crystal injection port 39 is sealed by the sealing material 40 is shown.

Next, the configuration of each substrate will be described with reference to FIGS. First, the array substrate 1
2 and 3, a plurality of scanning lines 13 made of, for example, Mo / Al two-layer wiring are formed on the surface of the first transparent substrate 12 so as to be parallel to each other. A gate insulating film (first insulating film) 15 made of a transparent insulating material such as silicon nitride or silicon oxide is covered over the entire surface of the first transparent substrate 12 on which the scanning lines 13 are formed. Furthermore,
A thin film transistor (TFT: Th) as a switching element on the surface of the gate insulating film 15.
The region where the in-film transistor 20 is formed is, for example, amorphous silicon (hereinafter referred to as “a”).
-Si ". ) Layer of semiconductor layer 16 is formed. The region of the scanning line 13 where the semiconductor layer 16 is formed forms the gate electrode 19 of the TFT.

Further, on the surface of the gate insulating film 15, a signal line 14 and a drain electrode 18 including a source electrode 17 made of a conductive layer having a three-layer structure of, for example, Mo / Al / Mo are formed. Both the source electrode 17 portion and the drain electrode 18 portion of the signal line 14 partially overlap the surface of the semiconductor layer 16. Further, the entire surface of the array substrate 11 is covered with an interlayer film 21 made of a photosensitive material, and a contact hole 26 is formed in the interlayer film 21 at a position corresponding to the drain electrode 18.

Then, a transparent conductive material such as ITO (In) is formed on the interlayer film 21 in a region surrounded by the scanning lines 13 and the signal lines 14 (hereinafter referred to as a sub-pixel region 43) so that the pattern shown in FIG.
A lower electrode (first electrode) 22 is formed of a transparent conductive material made of dium thin oxide (Idium) or IZO (Indium Zinc Oxide). The lower electrode 22 is electrically connected to the drain electrode 18 through a contact hole 26. Therefore, the lower electrode 22 operates as a pixel electrode. Further, an interelectrode insulating film (second insulating film) 23 is formed on the lower electrode 22. For the interelectrode insulating film 23, a transparent insulating material having good insulating properties such as silicon nitride is used.

On the interelectrode insulating film 23, an upper electrode (second electrode) is formed of a transparent conductive material made of ITO or IZO having a plurality of comb-shaped slits 25 in a plan view, for example, in the subpixel region 43.
Electrode) 24 is formed. A predetermined alignment film (not shown) is formed over the entire surface of the substrate. The upper electrode 24 is formed over the entire display area 37 and is electrically connected to a common wiring (not shown) in the non-display area 38. for that reason,
The upper electrode 24 operates as a common electrode.

Further, as shown in FIG. 3, the color filter substrate 28 has a light shielding layer 30 so as to cover the surface of the second transparent substrate 29 made of a glass substrate or the like so as to cover the positions corresponding to the scanning lines 13 and the TFTs 20 of the array substrate 11. Is formed. And the 2nd transparent substrate 2 in which the light shielding layer 30 was formed.
A color filter layer 31 composed of a plurality of colors, for example, red 32R, green 32G, and blue 32B (see FIG. 4) is formed on the surface 9. In the conventional FFS mode liquid crystal display device, the light shielding layer is formed so as to cover the position corresponding to the signal line.
In the FS mode liquid crystal display device 10, the light shielding layer is not formed at a position corresponding to the signal line 14.

As shown in FIG. 4, the color filter layer 31 is formed so as to be separated from the signal line 14 formed on the array substrate 11 by a predetermined distance on both sides from the position where it is overlapped in plan view. The unfinished area is a non-colored area 42. In particular,
The non-colored region 42 refers to a portion separated from the end of the signal line 14 formed on the array substrate 11 to the end of the color filter layer 31. Further, the light shielding layer 30 and the color filter layer 31
An overcoat layer 33 made of a resin or the like is formed so as to cover the surface, and an alignment film (not shown) is formed over the entire surface of the color filter substrate 28. Note that polarizing plates 27 and 34 are provided on the outer surfaces of the array substrate 11 and the color filter substrate 28 having such a configuration, respectively.

Then, a sealing material is applied and bonded to one of the array substrate 11 and the color filter substrate 28, and the liquid crystal 35 is injected from the liquid crystal injection port 39 formed by the sealing material 36, and the liquid crystal injection port 39 is sealed. The liquid crystal display device 10 according to the first embodiment is obtained by sealing with the stopper 40 and installing the driver IC 41 and the like in the mounting region 12a.

Next, the effect obtained by providing the non-colored region 42 will be described with reference to FIGS. 4 to 9, 15 and 16 with reference to a comparative example as a conventional example.

As shown in FIGS. 4 and 5, the color filter substrate 2 of the liquid crystal display device 10 of the first embodiment.
Eight color filter layers 32R, 32G, and 32B (hereinafter collectively referred to as color filter layer 31) are provided with non-colored regions 42. The non-colored regions 42 are provided on both sides in plan view with the signal lines 14 formed on the array substrate 11 in between. In the liquid crystal display device 10 according to the first embodiment, the non-colored region 42 provided on the color filter substrate 28.
Where X is the distance from each end of the signal line 14 to the end of the color filter layer 31.
A case where the width X is provided up to a distance of 1.25 μm will be described.

Further, as shown in FIG. 5, the color filter layers 32R, 32G, and 32B for each color are formed slightly thicker than the conventional color filter layers. Liquid crystal display device 10 of Embodiment 1
Then, in order to compensate for the fact that the non-colored region 42 is provided in the color filter layer 31 to make the color transmitted through the color filter layer 31 lighter than before, the color filter layer 3
This is because the thickness of the color filter layer 31 is increased in proportion to the area of one non-colored region 42. A dotted line L1 shown in FIG. 5 is a reference line when the substrates 11 and 28 are bonded as designed.

In addition, since the extent to which a color becomes thin changes with each color, the color filter layer 3 at this time
When the thickness of 1 is formed to be different for each color, it is possible to efficiently compensate for the thinning of each color and achieve a good white balance. In the case of the liquid crystal display device 10 according to the first embodiment, the width X of the non-colored region 42 is set to 1. in correspondence with the graph showing the relationship between the film thickness of the non-colored region 42 and the color filter layer 31 shown in FIG. The film thickness of each color filter layer when provided up to 25 μm is about 1.8 μm for red 32R and about 1 for green 32G.
. The thickness of 64 μm and blue 32B is about 1.57 μm. This graph was obtained by the inventor through experiments.

In addition, since the width X for providing the non-colored region 42 is arbitrary, the width X corresponds to this graph.
Any film thickness corresponding to is obtained. However, if the non-colored region 42 is provided too wide, it is necessary to form the color filter layer 31 thicker, and the color filter layer 31 formed thicker does not transmit light, so that color display becomes difficult. There is a risk that. Therefore, it is preferable that the non-colored region 42 is located up to a position where the width X is 0 <X ≦ 2.0 μm apart. Furthermore, the width X of the non-colored region 42 should be large to some extent in order to suppress color mixing due to a shift during the bonding of the array substrate 11 and the color filter substrate 28. Therefore, the width X is 0.5 ≦ X. More preferably, ≦ 2.0 μm.

Next, the effect of the liquid crystal display device 10 of Embodiment 1 is demonstrated with reference to a comparative example. Since the liquid crystal display device 10 ′ of the comparative example is different from the liquid crystal display device 10 of the first embodiment only in the way of forming the color filter layer, the other common parts are denoted by the same reference numerals and detailed description thereof is omitted. Description is omitted.

A conventional liquid crystal display device 10 ′ as a comparative example shown in FIG. 15 is a liquid crystal display device using a light shielding layer 30 ′ in which two color filter layers 31 ′ are stacked, and the color filter layer 31 ′. Between the light shielding layer 30 ′ and the non-colored region is not formed. In such a liquid crystal display device 10 ′, when the two substrates 11 and 28 ′ are bonded to each other in the step of bonding the substrates 11, the light shielding layer 30 ′ in the portion overlapping the signal line 14 as shown in FIG. The light shielding layer 30 ′ is positioned on the pixel electrode 22 in the sub-pixel region 43 as a result of being pasted in the lateral direction with reference to the line 14. Note that this shift is a distance moved from the dotted line L1 ′ to L2 ′ as shown in FIG. Therefore, when the entire display pixel is irradiated with light from a backlight light source (not shown) in order to display an image or the like, the light is transmitted through a portion overlapping with the pixel electrode of the light shielding layer 30 ′ in which the color filter layer is laminated. Then, the light transmitted through the portion of the light shielding layer 30 ′ and the light transmitted through the designed regular color filter layer 31 are mixed, resulting in a decrease in chromaticity and the like.

On the other hand, in the liquid crystal display device 10 of the first embodiment, as shown in FIGS. 4 and 5, the color filter substrate 31 is provided with a non-colored region 42. Therefore, in the liquid crystal display device 10 according to the first embodiment, in the step of bonding the substrates 11 and 28, the shift to the substrates 11 and 28 is caused.
6 and 7, even if the substrates 11 and 28 are attached with a deviation from the dotted lines L 1 to L 2, this deviation W occurs only in the non-colored region 42. For this reason, the color filter layer 31 is located at the portion indicated by the symbol C on the designed pixel electrode 22 in a plan view even when the shift W occurs, and therefore does not shift to the adjacent pixel electrode side. .

As a result, the designed normal color filter layer 31 is disposed in the sub-pixel region 43, and color mixing can be suppressed. Furthermore, the liquid crystal display device 1 of Embodiment 1
In 0, since a light shielding layer is not formed at a position overlapping the signal line 14 in plan view, a high aperture ratio can be obtained. The minimum necessary light shielding at this time can be supplemented by the signal line 14 formed on the array substrate 11.

In the liquid crystal display device according to the first embodiment, the FSS mode is taken as an example of the horizontal electric field type liquid crystal display device. However, the present invention is not limited to this, and the horizontal electric field type liquid crystal display device such as an IPS (In-Plane Switching) mode is used. It is applicable to. In the liquid crystal display device 10 according to the first embodiment, the case where the liquid crystal injection port 39 is formed has been described as an example. is there. In this case, the liquid crystal injection port is not formed.

[Embodiment 2]
In the liquid crystal display device 10 of the first embodiment, the signal lines 14 formed on the array substrate 11 are linear, but the signal lines 14A formed on the liquid crystal display device 10A of the second embodiment are so-called “ku”.
The case where it is bent in a letter shape will be described. The liquid crystal display device 10A according to the second embodiment is different from the liquid crystal display device 10 according to the first embodiment only in the shapes of the signal lines and the non-colored regions. Is omitted.

As shown in FIG. 11, the signal line 14 </ b> A of the liquid crystal display device 10 </ b> A according to the second embodiment is formed in a so-called “<” shape. With such a shape, a liquid crystal display device with a high viewing angle can be obtained. Thus, when the signal line 14A is formed to be bent in a "<" shape, conventionally, it has been necessary to form a light shielding layer in accordance with the bent signal line. For this reason, since the light shielding layer is bent and formed, a deviation from the design value is likely to occur, and as a result, a deviation at the time of bonding the substrates is likely to occur.

Therefore, in the liquid crystal display device 10A of Embodiment 2, the non-colored region 42A having the width X of the color filter layer 31A is provided in a shape that overlaps with the signal line 14A. By adopting such a structure, even when a shift W occurs when the two substrates are bonded, the shift W occurs when the both substrates are bonded to each other as in the liquid crystal display device of the first embodiment. Is the non-colored region 42
Since only A and the color filter layer 31 does not shift to the adjacent pixel electrode 22 side, color mixing can be suppressed, and a wide viewing angle liquid crystal display device in which a decrease in aperture ratio is suppressed can be provided. .

[Embodiment 3]
In the liquid crystal display device 10 according to the first embodiment, the thickness of the color filter layer 31 is adjusted in order to prevent the emission color from being thinned by providing the non-colored region 42. On the other hand, in the liquid crystal display device 10B of the third embodiment, the color filter layer 31B is made uniform to some extent, and instead the width of the non-colored region of each color is adjusted for each color, so that the emitted color becomes lighter. The suppressed liquid crystal display device will be described. In addition, the liquid crystal display device 10 of Embodiment 3
B is different from the liquid crystal display device 10 of Embodiment 1 only in the formation state of the width X of the non-colored region 42B provided on the color filter substrate 28B. Is omitted.

In the liquid crystal display device 10 of the first embodiment, the non-colored region 42 has the thickness of each color filter layer when the width X is 1.25 μm apart. This was obtained by the inventors through experiments. It is derived based on the graph shown in FIG. Therefore, as shown in FIG. 12, with reference to the graph of FIG. 10, the separation width of the non-colored regions 42B1, 42B2, and 42B3 of the respective colors when the film thicknesses of the color filter layers 32RB, 32GB, and 32BB are made constant is derived. By forming the color filter substrate 28B with the widths XB1, XB2, and XB3, it is possible to obtain the liquid crystal display device 10B in which the thickness of the color filter layer 31B is constant.

For example, when the thickness of each color filter layer is 1.6 μm, the separation widths XB1, XB2, and XB3 of the non-colored region 42B provided in the color filter layer of each color are 0 in red 32BR.
. 5 μm, green 32 GB is 0.8 μm, and blue 32 BB is 1.7 μm. As described above, the spaced widths XB1, XB2, and XB3 are preferably in the range of 0 <X ≦ 2.0 μm. Therefore, according to the liquid crystal display device of the third embodiment, it is not necessary to change the thickness of the color filter layer for each color, and therefore the production of the color filter layer is facilitated. Furthermore, since it is possible to suppress the occurrence of steps in the layers formed in the color filter substrate, a liquid crystal display device with high formation accuracy can be provided.

[Embodiment 4]
The FFS mode liquid crystal display device has been described as an example of the horizontal electric field method in the liquid crystal display device of the first embodiment. However, in the liquid crystal display device of the second embodiment, VA (Vertical) is used as an example of the vertical electric field method.
An alignment mode liquid crystal display device will be described. The liquid crystal display device 10C according to the fourth embodiment is different from the liquid crystal display device 10 according to the first embodiment only in the driving method, and thus common portions are denoted by the same reference numerals and detailed description thereof is omitted.

In the conventional VA liquid crystal display device, since the non-colored region is not provided, there is a problem such as a shift at the time of bonding the substrates as described above. On the other hand, according to the liquid crystal display device 10C of Embodiment 4 as shown in FIG. 13, the color filter layer 32C of the color filter substrate 28C.
Since the non-colored region 42C is provided in the VA, color mixing can be suppressed even when the first substrate and the second substrate are bonded to each other even when the first substrate and the second substrate are bonded to each other. A liquid crystal display device of the type can be provided. Note that reference numeral 44 in FIG. 13 denotes a VA protrusion for arranging liquid crystals.

In the liquid crystal display device 10C of the fourth embodiment, the VA method is used as an example of the vertical electric field type liquid crystal display device. However, the liquid crystal display device is not limited to this, and the TN (Twisted Ne) is not limited to this.
The present invention is also applicable to liquid crystal display devices such as a (matic) mode, a VA mode, and an MVA (Multidomain Vertical Alignment) mode. However, in the non-colored area and the colored area, different parts are formed in the thickness of the color filter substrate depending on the presence or absence of the color filter layer. The horizontal electric field method is more suitable than the method.

[Embodiments 5 and 6]
The liquid crystal display device 10 of the first embodiment is provided with the non-colored regions 42 on both sides of the signal line 14, but the liquid crystal display devices 10D and 10E of the fifth and sixth embodiments sandwich the scanning line 13. A liquid crystal display device provided with non-colored regions 42D and 42E on both sides will be described. The liquid crystal display devices according to the fifth and sixth embodiments are different from the liquid crystal display device according to the first embodiment only in the arrangement of the sub-pixel regions, and thus common portions are denoted by the same reference numerals and detailed description thereof is omitted.

As shown in the liquid crystal display device 10 of Embodiment 1, in the case where the sub-pixel region is formed in a so-called stripe shape, even when the substrates are bonded, even if they are shifted in the front-rear direction with reference to the scanning line, color mixing is performed. Therefore, it was not necessary to provide non-colored areas on both sides of the scanning line 13. However, when the sub-pixel region 43 is formed in a so-called delta shape as in the liquid crystal display device 10D of the fifth embodiment shown in FIG. 14A, or so-called as in the liquid crystal display device 10E of the sixth embodiment shown in FIG. 14B. In the case where the sub-pixel regions 43 are formed in a mosaic shape, if there is a shift in the front-rear direction, the upper color and the lower color may be mixed.

Thus, by providing the non-colored regions 42D and 42E on both sides of the scanning line 13 as in the liquid crystal display devices 10D and 10E of the fifth and sixth embodiments, the sub-pixel region 43 is formed in a delta shape or a mosaic shape. Even a liquid layer display device can suppress color mixing and provide a liquid crystal display device having a display screen with a high aperture ratio.

Note that the horizontal electric field type and vertical electric field type liquid crystal display devices have been described above, but the present invention is not limited to this, and a transflective liquid crystal display device or Also in the case of a reflective liquid crystal display device, a liquid crystal display device having the same effects as described above can be provided.

10, 10A to 10E: Liquid crystal display device 11: Array substrate 12: First transparent substrate 12a
: Mounting area 13, 13D, 13E: Scanning line 14, 14A, 14D, 14E: Signal line
15: Gate insulating film 16: Semiconductor layer 17: Source electrode 18: Drain electrode 19:
Gate electrode 20: TFT 21: Interlayer film 22: Lower electrode 23: Interelectrode insulating film 24:
Upper electrode 25: Slit 26: Contact hole 27: Polarizing plate 28, 28 ', 28
A, 28B: Color filter substrate 29, 29 ′, 29A, 29B: Second transparent substrate 3
0, 30 ′: Light shielding layer 31, 31A to 31E: Color filter layer 32R, 32RA—
32RE: Red 32G, 32GA to 32GE: Green 32B, 32BA to 32BE: Blue 3
3: Overcoat layer 34: Polarizing plate 35: Liquid crystal 36: Sealing material 37: Display area
38: Non-display area 39: Liquid crystal injection port 40: Sealing material 41: Driver 42, 42A
To 42E: non-colored area 43: sub-pixel area 44: VA protrusion

Claims (11)

A first substrate and a second substrate disposed opposite to each other with a liquid crystal layer interposed therebetween;
The first substrate includes
A plurality of scanning lines and signal lines formed so as to intersect with each other while being insulated from each other, and sub-pixels partitioned by the scanning lines and signal lines,
The second substrate includes a color filter layer formed for each sub-pixel defined by the scanning line and the signal line in a plan view.
In the liquid crystal display device provided with a transparent electrode on the first substrate,
The color filter layer formed for each sub-pixel has a non-colored region,
The liquid crystal display device, wherein the non-colored region is formed at a position partially overlapping with the transparent electrodes located on both sides of the signal line in plan view. 2. The liquid crystal display device according to claim 1, wherein the thickness of the color filter layer is increased in proportion to the area of the non-colored region, and the increase amount is different for different colors of the color filter layer. . The non-colored region is formed so as to have an end portion of the colored region at a position equidistant from each end portion of the signal line, with both end portions of the signal line as base points. Item 2. A liquid crystal display device according to item 1. The non-colored region has 0 <X on both sides from the signal line, where X is the distance from each end of the signal line to the end of the non-colored region, with both ends of the signal line as base points. ≦ 2.
The liquid crystal display device according to claim 3, wherein the liquid crystal display device is formed up to a position separated by 0 μm. 5. The liquid crystal display device according to claim 4, wherein a distance X from each end of the signal line of the non-colored region is 0.5 ≦ X ≦ 2.0 μm. 2. The liquid crystal display device according to claim 1, wherein the non-colored region is formed with a different area for each different color of the color filter layer. In the first substrate, the transparent electrode formed for each sub-pixel defined by the scanning line and the signal line is a pixel electrode, and is formed in a state of being electrically insulated from the pixel electrode. The liquid crystal display device according to claim 1, further comprising a common electrode. The liquid crystal display device according to claim 7, wherein the signal line is bent in a “<” shape. The liquid crystal display device according to claim 1, wherein the transparent electrode is formed on each of the first substrate and the second substrate. The liquid crystal display device according to claim 1, wherein a reflective layer is formed in a partial region of the sub-pixel on the first substrate. The sub-pixel array is formed of a delta array or a mosaic array,
The non-colored region is configured such that the distance from the end of the scanning line to the end of the non-colored region is equidistant from the end of the scanning line as a base point. Item 2. A liquid crystal display device according to item 1.

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