WO2010137359A1

WO2010137359A1 - Liquid crystal panel and display device

Info

Publication number: WO2010137359A1
Application number: PCT/JP2010/051781
Authority: WO
Inventors: 坂田徹; 中川朗
Original assignee: シャープ株式会社
Priority date: 2009-05-29
Filing date: 2010-02-08
Publication date: 2010-12-02

Abstract

Disclosed is a liquid crystal panel (2) which has: a liquid crystal layer (4); an active matrix substrate (5) and a color filter substrate (6) (a pair of substrates) which have the liquid crystal layer (4) therebetween; and a plurality of pixels (P) provided in an effective display region (A). The liquid crystal panel is provided with: color filter layers (Cr1, Cr2) provided on the color filter substrate (6) side; a black matrix (BM2) provided in the effective display region (A); and a black matrix section (BM1) formed in a frame shape outside of the effective display region (A). The film thickness of the black matrix (BM2) is smaller than that of the black matrix section (BM1).

Description

Liquid crystal panel and display device

The present invention relates to a liquid crystal panel and a display device using the same.

In recent years, for example, liquid crystal display devices have been widely used in liquid crystal televisions, monitors, mobile phones and the like as flat panel displays having features such as thinness and light weight compared to conventional cathode ray tubes. Such a liquid crystal display device includes an illumination device (backlight device) that emits light, and a liquid crystal panel that displays a desired image by serving as a shutter for light from a light source provided in the illumination device. It is included.

The liquid crystal panel as described above includes a liquid crystal layer containing liquid crystal molecules and a pair of substrates sandwiching the liquid crystal layer. In the liquid crystal panel, a plurality of pixels are provided in the effective display area. In the plurality of pixels, generally, a color filter layer of any one of red (R), green (G), and blue (B) formed on one side of a pair of substrates has a corresponding color. It is designed to display. In the liquid crystal panel, a black matrix (light-shielding film) is formed on one side of the pair of substrates so as to be disposed between two adjacent color filter layers. The display contrast is improved. Further, in the liquid crystal panel, the black matrix is formed in a frame shape so as to be along the outer peripheral portion of one substrate outside the effective display area, and light is transmitted from the outside of the effective display area to the outside by this frame-shaped black matrix. It is designed to prevent leakage.

Further, in a conventional liquid crystal panel, for example, as described in Patent Document 1 below, a part of a green color filter layer is laminated on a part of a black matrix, and a pigment is added to the black matrix. And at least one selected from metal particles and metal compound particles. Further, in this conventional liquid crystal panel, the ratio (B / A) of the pigment content B to the metal particle and metal compound particle content A in the black matrix is in the range of 0.2 to 10, and the color filter layer The thickness ratio (TG / BM) between the thickness TG of the black matrix and the thickness BM of the black matrix formed in a state where a part of the color filter layer is laminated is in the range of 1.2 to 10. As a result, this conventional liquid crystal panel has a high contrast in a bright room, no malfunction of TFT, no display unevenness, and it is possible to achieve both high color purity and high transmittance.

International Publication No. 2006/132240 Pamphlet

However, the conventional liquid crystal panel as described above has a problem in that the occurrence of light leakage cannot be prevented and the display quality is deteriorated.

Specifically, in the conventional liquid crystal panel, a part of the color filter layer is laminated on a part of the black matrix. Therefore, the color filter layer is not formed flat, but on the black matrix. Part of the shape protrudes toward the liquid crystal layer. For this reason, in the conventional liquid crystal panel, the alignment disorder | damage | failure generate | occur | produced in the liquid crystal molecule contained in the liquid-crystal layer, and the light leakage might be produced. In addition, in the conventional liquid crystal panel, it is conceivable to reduce the thickness of the black matrix in order to prevent the occurrence of light leakage due to the alignment disorder of the liquid crystal molecules as described above. The film thickness of the frame-shaped black matrix is also reduced, and light leakage from the outside of the effective display area (outer peripheral portion of the substrate) may occur. As described above, in the conventional liquid crystal panel, light leakage may occur from the inside or outside of the effective display area, which may cause deterioration in display quality.

In view of the above problems, an object of the present invention is to provide a liquid crystal panel excellent in display quality capable of preventing the occurrence of light leakage, and a display device using the same.

In order to achieve the above object, a liquid crystal panel according to the present invention is a liquid crystal panel having a liquid crystal layer, a pair of substrates sandwiching the liquid crystal layer, and a plurality of pixels provided in an effective display area. And
A color filter layer of a predetermined color provided for each pixel on one side of the pair of substrates;
Provided in the effective display area and formed on one side of the pair of substrates in a state where a part of each of the two color filter layers is laminated between two adjacent color filter layers Black matrix,
A black matrix portion formed in a frame shape along the outer peripheral portion of the substrate so as to be provided outside the effective display area on one side of the pair of substrates,
The thickness of the black matrix is smaller than the thickness of the black matrix portion.

In the liquid crystal panel configured as described above, the thickness of the black matrix formed in the effective display area is smaller than the thickness of the black matrix portion formed in a frame shape outside the effective display area. Has been. As a result, it is possible to prevent the occurrence of light leakage due to the disorder of the alignment of liquid crystal molecules in the effective display area, and it is possible to prevent the occurrence of light leakage from the outside of the effective display area. That is, unlike the conventional example, it is possible to prevent light leakage from the inside and outside of the effective display area. Therefore, a liquid crystal panel excellent in display quality that can prevent light leakage can be configured.

In the liquid crystal panel, it is preferable that the film thickness of the black matrix portion is set to a dimension that is 1.2 times or more the film thickness of the black matrix.

In this case, it is possible to reliably prevent light leakage from the outside of the effective display area.

In the liquid crystal panel, the color filter layer of the predetermined color may include a color filter layer of each color of red (R), green (G), and blue (B).

In this case, a pixel for displaying each color of RGB is configured, and a liquid crystal panel capable of full color display can be easily configured.

Further, the display device of the present invention is characterized by using any of the above liquid crystal panels.

In the display device configured as described above, since a liquid crystal panel excellent in display quality that can prevent light leakage is used, a high-performance display device having excellent display quality is easily configured. be able to.

According to the present invention, it is possible to provide a liquid crystal panel excellent in display quality that can prevent light leakage and a display device using the same.

FIG. 1 is a schematic cross-sectional view illustrating a liquid crystal display device according to an embodiment of the present invention. FIG. 2 is a diagram for explaining the configuration of the liquid crystal panel shown in FIG. FIG. 3A is an enlarged cross-sectional view showing the main configuration of the liquid crystal panel, and FIG. 3B is a plan view for explaining a frame-shaped black matrix portion. FIG. 4A is a diagram for explaining an operation example in the liquid crystal panel, and FIG. 4B is a diagram for explaining an operation example in the conventional product.

Hereinafter, preferred embodiments of the liquid crystal panel and the display device of the present invention will be described with reference to the drawings. In the following description, the case where the present invention is applied to a transmissive liquid crystal display device will be described as an example. Moreover, the dimension of the structural member in each figure does not faithfully represent the actual dimension of the structural member, the dimension ratio of each structural member, or the like.

FIG. 1 is a schematic cross-sectional view for explaining a liquid crystal display device according to an embodiment of the present invention. In the figure, the liquid crystal display device 1 of the present embodiment includes the liquid crystal panel 2 of the present invention as a display unit installed on the upper side of the figure as the viewing side (display surface side), and the non-display surface side of the liquid crystal panel 2 ( Arranged on the lower side of the figure is provided an illuminating device 3 for generating illumination light for illuminating the liquid crystal panel 2.

The liquid crystal panel 2 includes a liquid crystal layer 4, an active matrix substrate 5 and a color filter substrate 6 that sandwich the liquid crystal layer 4, and a polarizing plate 7 provided on each outer surface of the active matrix substrate 5 and the color filter substrate 6. , 8. Further, the liquid crystal panel 2 is provided with a driver device 9 for driving the liquid crystal panel 2 and a drive circuit device 10 connected to the driver device 9 via the flexible printed circuit board 11. The liquid crystal layer 4 can be driven pixel by pixel. In the liquid crystal panel 2, the polarization state of the illumination light incident through the polarizing plate 7 is modulated by the liquid crystal layer 4 and the amount of light passing through the polarizing plate 8 is controlled, so that a desired image is displayed. Is done.

The illuminating device 3 is provided with a bottomed chassis 12 opened on the upper side (liquid crystal panel 2 side) in the figure, and a frame-like frame 13 installed on the liquid crystal panel 2 side of the chassis 12. The chassis 12 and the frame 13 are made of metal or synthetic resin and are sandwiched by a bezel 14 having an L-shaped cross section in a state where the liquid crystal panel 2 is installed above the frame 13. Thereby, the illuminating device 3 is assembled to the liquid crystal panel 2 and integrated as a transmissive liquid crystal display device 1 in which illumination light from the illuminating device 3 enters the liquid crystal panel 2.

The illumination device 3 is provided on the inner surface of the chassis 12, the diffusion plate 15 installed so as to cover the opening of the chassis 12, the optical sheet 17 installed on the liquid crystal panel 2 side above the diffusion plate 15. The reflection sheet 21 is provided. In the lighting device 3, a plurality of, for example, six cold cathode fluorescent tubes 20 are provided inside the chassis 12 on the lower side of the liquid crystal panel 2 to constitute a direct-type lighting device 3. And in the illuminating device 3, the light from each cold cathode fluorescent tube 20 is radiate | emitted as the said illumination light from the light emission surface of the illuminating device 3 arrange | positioned facing the liquid crystal panel 2. FIG.

In the above description, the configuration using the direct illumination device 3 has been described. However, the present embodiment is not limited to this, and an edge light illumination device having a light guide plate may be used. . Moreover, the illuminating device which has other light sources, such as hot cathode fluorescent tubes other than a cold cathode fluorescent tube, and LED, can also be used.

The diffusion plate 15 is made of, for example, a rectangular synthetic resin or glass material having a thickness of about 2 mm, and diffuses light from the cold cathode fluorescent tube 20 and emits the light to the optical sheet 17 side. The diffusion plate 15 is mounted on a frame-like surface provided on the upper side of the chassis 12 on the four sides, and the surface of the chassis 12 and the surface of the frame 13 are interposed with an elastically deformable pressing member 16 interposed therebetween. It is incorporated in the lighting device 3 in a state of being held between the inner surface and the inner surface. Further, the diffusion plate 15 is supported at its substantially central portion by a transparent support member (not shown) installed inside the chassis 12, and is prevented from bending inside the chassis 12.

Further, the diffusion plate 15 is movably held between the chassis 12 and the pressing member 16, and the diffusion plate is affected by heat such as heat generation of the cold cathode fluorescent tube 20 and temperature rise inside the chassis 12. 15, even when expansion (plastic) deformation occurs, the pressing member 16 is elastically deformed so that the plastic deformation is absorbed and the diffusibility of light from the cold cathode fluorescent tube 20 is not reduced as much as possible. Yes. Further, the use of the diffusion plate 15 made of a glass material that is more resistant to heat than the synthetic resin is preferable in that warpage, yellowing, thermal deformation, and the like due to the influence of the heat are less likely to occur.

The optical sheet 17 includes a light collecting sheet made of, for example, a synthetic resin film having a thickness of about 0.5 mm, and is configured to increase the luminance of the illumination light to the liquid crystal panel 2. The optical sheet 17 may be appropriately laminated with known optical sheet materials such as a prism sheet, a diffusion sheet, and a polarizing sheet for improving display quality on the display surface of the liquid crystal panel 2 as necessary. It has become. Then, the optical sheet 17 converts the light emitted from the diffusion plate 15 into planar light having a predetermined luminance (for example, 5000 cd / m ² ) or more and uniform luminance, and is used as illumination light for the liquid crystal panel 2. It is comprised so that it may inject into the side. In addition to the above description, for example, an optical member such as a diffusion sheet for adjusting the viewing angle of the liquid crystal panel 2 may be appropriately stacked above the liquid crystal panel 2 (display surface side).

Further, in the optical sheet 17, for example, a protruding portion that protrudes to the left in FIG. 1 is formed at the central portion on the left end side in FIG. 1 that is on the upper side when the liquid crystal display device 1 is actually used. In the optical sheet 17, only the protruding portion is sandwiched between the inner surface of the frame 13 and the pressing member 16 with the elastic material 18 interposed therebetween. The optical sheet 17 can be expanded and contracted inside the lighting device 3. Built in state. Thereby, in the optical sheet 17, even when expansion / contraction (plastic) deformation occurs due to the influence of the heat such as the heat generation of the cold cathode fluorescent tube 20, free expansion / contraction deformation based on the protruding portion becomes possible. The optical sheet 17 is configured to prevent wrinkles and deflections from occurring as much as possible. As a result, in the liquid crystal display device 1, it is possible to prevent the display quality of the liquid crystal panel 2 from being deteriorated as much as possible due to the bending of the optical sheet 17 or the like on the display surface of the liquid crystal panel 2.

Each cold cathode fluorescent tube 20 is a straight tube, and electrode portions (not shown) provided at both ends thereof are supported outside the chassis 12. In addition, each cold cathode fluorescent tube 20 is a thin tube having a diameter of about 3.0 to 4.0 mm and excellent in luminous efficiency. Each cold cathode fluorescent tube 20 includes a light source holder (not shown). Thus, the distance between each of the diffusion plate 15 and the reflection sheet 21 is held in the chassis 12 in a state where the distance is maintained at a predetermined distance. Further, the cold cathode fluorescent tube 20 is arranged so that its longitudinal direction is parallel to a direction orthogonal to the direction of gravity action. As a result, in the cold cathode fluorescent tube 20, mercury (vapor) enclosed therein is prevented from gathering on one end side in the longitudinal direction due to the action of gravity, and the lamp life is greatly improved. Yes.

The reflection sheet 21 is made of a metal thin film having a high light reflectance such as aluminum or silver having a thickness of about 0.2 to 0.5 mm, for example, and reflects light from the cold cathode fluorescent tube 20 toward the diffusion plate 15. To function as a reflector. Thereby, in the illuminating device 3, the light emitted from the cold cathode fluorescent tube 20 can be efficiently reflected to the diffusion plate 15 side, and the use efficiency of the light and the luminance at the diffusion plate 15 can be increased. In addition to this description, a reflective sheet material made of synthetic resin is used in place of the metal thin film, or the inner surface of the chassis 12 is reflected by applying a paint having a high light reflectance such as white. It can also function as a plate.

Next, the liquid crystal panel 2 of the present embodiment will be specifically described with reference to FIG.

FIG. 2 is a diagram for explaining the configuration of the liquid crystal panel shown in FIG.

2, the liquid crystal display device 1 (FIG. 1) includes a panel control unit 22 that controls driving of the liquid crystal panel 2 (FIG. 1) as the display unit that displays information such as characters and images, and the panel control. A source driver 23 and a gate driver 24 that operate based on an instruction signal from the unit 22 are provided.

The panel control unit 22 is provided in the drive circuit device 10 (FIG. 1), and receives a video signal from the outside of the liquid crystal display device 1. The panel control unit 22 performs predetermined image processing on the input video signal to generate instruction signals to the source driver 23 and the gate driver 24, and the input video signal. A frame buffer 22b capable of storing display data for one frame included. The panel control unit 22 performs drive control of the source driver 23 and the gate driver 24 in accordance with the input video signal, so that information corresponding to the video signal is displayed on the liquid crystal panel 2.

The source driver 23 and the gate driver 24 are provided in the drive device 9 (FIG. 1), and are installed on the active matrix substrate 5 of the present embodiment that constitutes the array substrate. Specifically, the source driver 23 is installed on the surface of the active matrix substrate 5 so as to be along the lateral direction of the liquid crystal panel 2 in the outer area of the effective display area A of the liquid crystal panel 2 as a display panel. . Further, the gate driver 24 is installed on the surface of the active matrix substrate 5 along the vertical direction of the liquid crystal panel 2 in the outer region of the effective display region A.

The source driver 23 and the gate driver 24 are drive circuits that drive a plurality of pixels P provided on the liquid crystal panel 2 side in units of pixels. The source driver 23 and the gate driver 24 include a plurality of source lines S1 to S1. SM (M is an integer of 2 or more, hereinafter collectively referred to as “S”) and a plurality of gate wirings G1 to GN (N is an integer of 2 or more, hereinafter collectively referred to as “G”). Each is connected. These source wiring S and gate wiring G constitute a data wiring and a scanning wiring, respectively, on a transparent glass material or a transparent synthetic resin substrate (not shown) included in the active matrix substrate 5. Are arranged in a matrix so as to cross each other. That is, the source wiring S is provided on the substrate so as to be parallel to the matrix-like column direction (vertical direction of the liquid crystal panel 2), and the gate wiring G is arranged in the matrix-like row direction (horizontal of the liquid crystal panel 2). Is provided on the substrate so as to be parallel to (direction).

Further, in the vicinity of the intersection of the source line S and the gate line G, the pixel P having a thin film transistor (Thin Film） Transistor) 25 as a switching element and a pixel electrode 26 connected to the thin film transistor 25 is provided. Yes. That is, in the active matrix substrate 5, regions of a plurality of pixels P are formed in each region partitioned in a matrix by the source wiring S and the gate wiring G. The plurality of pixels P include red (R), green (G), and blue (B) pixels. These RGB pixels are sequentially arranged in this order, for example, in parallel with the gate wirings G1 to GN. Further, these RGB pixels can display corresponding colors by a color filter layer (described later) provided on the color filter substrate 6 side.

Further, each gate wiring G1 to GN is provided for each pixel P, and the gate electrode of the thin film transistor 25 is connected thereto. On the other hand, the source electrode of the thin film transistor 25 is connected to each of the source lines S1 to SM. Further, the pixel electrode 26 provided for each pixel P is connected to the drain electrode of each thin film transistor 25. In each pixel P, the common electrode 27 is configured to face the pixel electrode 26 with the liquid crystal layer 4 provided on the liquid crystal panel 2 interposed therebetween.

Next, the color filter substrate 6 of the present embodiment will be specifically described with reference to FIG.

FIG. 3A is an enlarged cross-sectional view showing the configuration of the main part of the liquid crystal panel, and FIG. 3B is a plan view for explaining a frame-shaped black matrix portion.

As shown in FIG. 3A, in the liquid crystal panel 2, the liquid crystal layer 4 is provided in a frame shape along the outer peripheral portion of the liquid crystal panel 2 while being sandwiched between the active matrix substrate 5 and the color filter substrate 6. The sealing member 28 is sealed. In FIG. 3A, for simplification of the drawing, the source wiring S, the gate wiring G, the thin film transistor 25, the pixel electrode 26 provided on the active matrix substrate 5 side, and the color filter substrate 6 side are provided. Illustration of the common electrode 27 is omitted. Further, illustration of alignment films provided on the active matrix substrate 5 side and the color filter substrate 6 side so as to come into contact with the liquid crystal layer 4 is also omitted (FIGS. 4A and 4B described later). The same applies to the above).

Further, on the color filter substrate 6 side, as shown in FIG. 3B, black formed in a frame shape along the outer peripheral portion of the color filter substrate 6 so as to be provided outside the effective display area A. The matrix portion BM1 is installed on the surface of the color filter substrate 6. That is, the black matrix portion BM1 includes a linear portion BM1a provided in parallel with the X direction (vertical direction of the liquid crystal panel 2) in FIG. 3B and the Y direction (liquid crystal panel 2 of the liquid crystal panel 2). The black matrix portion BM1 is provided so that a part of the black matrix portion BM1 engages with the seal member 28 as shown in FIG. 3 (a). ing. Further, in the black matrix portion BM1, as shown in FIG. 3A, the black matrix portion BM1 includes a color filter in a state where a part of the color filter layer Cr1 provided outside the effective display area A is laminated. It is formed on the surface of the substrate 6. In the liquid crystal panel 2, the frame-shaped black matrix portion BM1 prevents light from leaking outside from the effective display area A.

On the color filter substrate 6 side, as shown in FIG. 3A, the black matrix BM2 is within the effective display area A and between the two adjacent color filter layers Cr1 and Cr2. The color filter layers Cr1 and Cr2 are formed on the surface of the color filter substrate 6 in a state where a part of them is laminated. Specifically, the black matrix BM2 is formed on the surface of the color filter substrate 6 so as to be parallel to the X direction. The color filter layers Cr1 and Cr2 are composed of color filter layers of two different colors among red (R), green (G), and blue (B), and are parallel to the X direction. Thus, it is formed on the color filter substrate 6 side. In the liquid crystal panel 2, the RGB pixel P is divided by the black matrix BM 2 to improve display contrast on the liquid crystal panel 2.

Since the color filter layers Cr1 and Cr2 are formed with the same film thickness, for example, in the color filter layer Cr1, the black matrix portion BM1 is compared with the portion Cr1a formed on the surface of the color filter substrate 6. The portions Cr1b and Cr1c respectively laminated on the upper and black matrixes BM2 protrude toward the liquid crystal layer 4 side. Further, in these portions Cr1b and Cr1c, the protruding dimension from the portion Cr1a is equal to the film thickness of the corresponding black matrix portion BM1 and black matrix BM2. The portion Cr1b is located outside the effective display area A.

In the color filter substrate 6, on the inner side of the liquid crystal panel 2 surrounded by the seal member 28, the common electrode 27 and the alignment film are respectively formed on the black matrix portion BM1, the black matrix BM2, and the color filter layers Cr1 and Cr2. They are formed sequentially with the same film thickness.

In the above description, as shown in FIG. 3A, the case where the color filter layers Cr1 and Cr2 are stacked on the left and right ends of the black matrix BM has been described. However, the color filter layers Cr1 and Cr2 may be formed so as to cover, for example, the left half portion and the right half portion of the black matrix BM, respectively.

In the color filter substrate 6 of the present embodiment, as shown in FIG. 3A, the film thickness Hb of the black matrix BM2 formed in the effective display area A is the film thickness of the frame-shaped black matrix portion BM1. It is set smaller than Ha.

Specifically, the film thickness Hb of the black matrix BM2 is set to a predetermined dimension (for example, 1.0 μm) or less. On the other hand, the film thickness Ha of the black matrix portion BM1 is set to a dimension (for example, 1.2 μm) that is 1.2 times or more the film thickness Hb of the black matrix BM2. Thereby, in the liquid crystal panel 2 of this embodiment, generation | occurrence | production of the light leakage from the inner side and the outer side of the effective display area A can be prevented.

Further, in the black matrix portion BM1 and the black matrix BM2, when the black matrix portion BM1 is formed on the surface of the color filter substrate 6 by using, for example, a sputtering method, the black matrix portion BM1 is formed as a two-layer structure of the black matrix BM2. May be. That is, on the surface of the color filter substrate 6, after the black matrix portions BM2 and the black matrix BM2 inside and outside the effective display area A are formed with the film thickness Hb of the black matrix BM2, the black outside the effective display area A is formed. The black matrix portion BM1 having the double thickness Ha may be formed by forming a film with the thickness Hb of the black matrix BM2 again on the matrix portion.

In addition to this description, for example, in the exposure process of the black matrix portion BM1 and the black matrix BM2, by using a halftone mask gray tone mask or the like, the resist exposure amount is different between the black matrix portion BM1 and the black matrix BM2. Thus, the black matrix portion BM1 and the black matrix BM2 may be formed.

Here, with reference to FIG. 4, an example of the operation in the liquid crystal panel 2 configured as described above will be specifically described. In the following description, actions and effects obtained by reducing the thickness of the black matrix BM2 relative to the thickness of the black matrix portion BM1 will be mainly described.

FIG. 4A is a diagram for explaining an operation example in the liquid crystal panel, and FIG. 4B is a diagram for explaining an operation example in the conventional product.

As shown in FIG. 4A, in the liquid crystal panel 2 of the present embodiment, the thickness of the black matrix BM2 is configured to be smaller than the thickness of the black matrix portion BM1. For this reason, in the color filter layer Cr1, as shown in FIG. 4A, the protruding dimension from the portion Cr1a formed on the surface of the color filter substrate 6 to the liquid crystal layer 4 side is the effective display area A. Compared with the portion Cr1b of the color filter layer Cr1 existing outside, the portion Cr1c of the color filter layer Cr1 existing inside the effective display area A is smaller. As a result, in the liquid crystal layer 4, the inclination of the liquid crystal molecules LC existing above the portion Cr1c can be made smaller than the liquid crystal molecules LC existing above the portion Cr1b, and the liquid crystal existing above the portion Cr1c. The molecules LC can be in substantially the same alignment state as the liquid crystal molecules LC existing above the portion Cr1a. Thereby, in the liquid crystal panel 2 of this embodiment, even when the illumination light L from the illuminating device 3 is irradiated, the occurrence of light leakage due to the alignment disorder of the liquid crystal molecules LC in the effective display region A is prevented. Can do.

On the other hand, in the conventional liquid crystal panel 50, as shown in FIG. 4B, when the illumination light L from the illumination device is irradiated, the alignment of the liquid crystal molecules 57 in the effective display region is disturbed. Occurrence of light leakage due to this could not be prevented. Specifically, the liquid crystal panel 50 includes an active matrix substrate 51 and a color filter substrate 52, and a liquid crystal layer 53 that is sandwiched between the active matrix substrate 51 and the color filter substrate 52 and sealed by a seal member 54. It has.

The color filter substrate 52 is provided with color filter layers 55a and 55b, and a black matrix portion 56a and a black matrix 56b provided outside and inside the effective display area, respectively. The color filter layer 55a is provided with a portion 55a1 provided on the surface of the color filter substrate 52 and portions 55a2 and 55a3 stacked on the surfaces of the black matrix portion 56a and the black matrix 56b, respectively. Similarly, the color filter layer 55b is provided with a portion 55b1 provided on the surface of the color filter substrate 52 and a portion 55b2 stacked on the surface of the black matrix 56b.

In the conventional liquid crystal panel 50, unlike the liquid crystal panel 2 of the present embodiment, the black matrix portion 56a and the black matrix 56b are formed to have the same thickness, and therefore, as shown in FIG. As described above, in the color filter layer 55a, the protruding dimension toward the liquid crystal layer 53 from the portion 55a1 formed on the surface of the color filter substrate 6 is the portion 55a2 of the color filter layer 55a that exists outside the effective display area A. And the portion 55a3 of the color filter layer 55a existing inside the effective display area A is the same. As a result, in the conventional liquid crystal layer 53, the inclination of the liquid crystal molecules 57 existing above the portion 55a3 is larger than the liquid crystal molecules 57 existing above the portion 55a1, and the liquid crystal existing above the portion 55a3. In the molecule 57, disorder of orientation occurs. Thereby, in the liquid crystal panel 50 of the conventional product, when the illumination light L from the illumination device is irradiated, light leakage L ′ caused by the alignment disorder of the liquid crystal molecules 57 in the effective display area occurs.

In the liquid crystal panel 2 of the present embodiment configured as described above, the black matrix portion in which the film thickness Hb of the black matrix BM2 formed in the effective display area A is formed in a frame shape outside the effective display area A. It is configured to be smaller than the film thickness Ha of BM1. Thereby, in the liquid crystal panel 2 of the present embodiment, as shown in FIG. 4A, it is possible to prevent the occurrence of light leakage due to the alignment disorder of the liquid crystal molecules LC in the effective display area A. Further, in the liquid crystal panel 2 of the present embodiment, the black matrix portion BM1 can prevent light leakage from the outside of the effective display area A. As a result, in this embodiment, unlike the conventional example, a liquid crystal panel excellent in display quality that can prevent light leakage from the inside and outside of the effective display area A and can prevent light leakage. 2 can be configured.

Further, in the liquid crystal panel 2 of the present embodiment, since the film thickness Hb of the black matrix BM2 is set to a predetermined dimension or less, the occurrence of light leakage due to the alignment disorder of the liquid crystal molecules LC in the effective display area A. Can be surely prevented.

Further, in the liquid crystal panel 2 of the present embodiment, since the film thickness Ha of the black matrix portion BM1 is set to a dimension that is 1.2 times or more the film thickness Hb of the black matrix BM2, from the outside of the effective display area A. It is possible to reliably prevent the occurrence of light leakage.

In this embodiment, since the liquid crystal panel 2 having excellent display quality that can prevent light leakage is used, a high-performance liquid crystal display device (display device) 1 having excellent display quality can be easily obtained. Can be configured.

It should be noted that all of the above embodiments are illustrative and not restrictive. The technical scope of the present invention is defined by the claims, and all modifications within the scope equivalent to the configurations described therein are also included in the technical scope of the present invention.

For example, in the above description, the case where the present invention is applied to a transmissive liquid crystal display device has been described. However, the liquid crystal panel of the present invention is not limited to this, for example, a transflective liquid crystal display device, or The liquid crystal panel of the present invention can be suitably used for a projection display device using the liquid crystal panel as a light valve.

In the above description, the black matrix portion BM1 is provided so that a part of the color filter layer Cr1 is laminated, and the black matrix portion BM1 is provided so as to engage with the seal member 28. Explained the case. However, the black matrix portion BM1 of the present invention is arranged along the outer peripheral portion of the color filter substrate 6 so as to be provided outside the effective display area A on the color filter substrate 6 side (one side of the pair of substrates). The black matrix portion BM1 may be configured to be separated from the color filter layer Cr1 and / or the seal member 28.

In the above description, the configuration in which the color filter layers for each color of RGB are provided is described. However, the color filter layer of the present invention is provided in units of pixels on the color filter substrate 6 side (one side of the pair of substrates). If it is a thing, it will not be limited at all. Specifically, for example, other four color filter layers such as RGB + Y (yellow), five color filter layers such as RGB + Y + C (cyan), and six color filter layers such as RGB + Y + C + W may be used.

However, as in the above-described embodiment, when the RGB color filter layer is used, pixels for displaying each color of RGB are configured, and a liquid crystal panel capable of full color display can be easily configured. Is preferable.

The present invention is useful for a liquid crystal panel excellent in display quality capable of preventing the occurrence of light leakage and a display device using the same.

1 Liquid crystal display device (display device)
2 Liquid crystal panel 4 Liquid crystal layer 5 Active matrix substrate (a pair of substrates)
6 Color filter substrates (a pair of substrates)
Cr1, Cr2 Color filter layer BM1 Black matrix part BM2 Black matrix P Pixel A Effective display area

Claims

A liquid crystal panel having a liquid crystal layer, a pair of substrates sandwiching the liquid crystal layer, and a plurality of pixels provided in an effective display area,
A color filter layer of a predetermined color provided for each pixel on one side of the pair of substrates;
Provided in the effective display area and formed on one side of the pair of substrates in a state where a part of each of the two color filter layers is laminated between two adjacent color filter layers Black matrix,
A black matrix portion formed in a frame shape along the outer peripheral portion of the substrate so as to be provided outside the effective display area on one side of the pair of substrates,
Compared to the film thickness of the black matrix portion, the film thickness of the black matrix was reduced.
A liquid crystal panel characterized by that.
The liquid crystal panel according to claim 1, wherein a film thickness of the black matrix portion is set to a dimension that is 1.2 times or more of a film thickness of the black matrix.
3. The liquid crystal panel according to claim 1, wherein the color filter layer of the predetermined color includes a color filter layer of each color of red (R), green (G), and blue (B).
A display device comprising the liquid crystal panel according to any one of claims 1 to 3.