JP5886698B2 - Liquid crystal display for monochrome display - Google Patents

Description

  The present invention relates to a transmissive liquid crystal display device, and more particularly to a monochrome display liquid crystal display device used as an image display device in the medical field.

  As a medical image display device, a transmission-type monochrome display liquid crystal display device is used, and an observer of an image displayed on the liquid crystal display device, for example, displays an image in a blue base color tone. I want. Therefore, in such a liquid crystal display device for monochrome display, there is one that displays an image in a color tone desired by an observer by adjusting the color tone of the light source device to a predetermined color tone. An example of such a liquid crystal display device is disclosed in Patent Document 1.

JP 2002-72982 A

  However, in the liquid crystal display device disclosed in Patent Document 1, the color tone of the light source of the light source device is adjusted in order to display an image having a color tone desired by the observer of the displayed image. In order to adjust the color tone in this way, the light source of the light source device having a desired color tone has to be selected, and there is a problem that the degree of freedom in selecting the light source is small.

  The present invention has been made in view of the above problems, and an object of the present invention is to display an image having a color tone desired by an observer of a displayed image without adjusting the color tone of the light source of the light source device. An object of the present invention is to provide a liquid crystal display device for monochrome display.

  The liquid crystal display device for monochrome display according to the present invention includes a first substrate and a second substrate that are disposed with their main surfaces facing each other, and a liquid crystal disposed between the first substrate and the second substrate. A plurality of gate wirings provided on the main surface of the first substrate, and a plurality of source wirings provided via the first insulating layer so as to intersect the plurality of gate wirings; A second insulating layer provided to cover the plurality of source wirings, and provided for each pixel surrounded by the plurality of gate wirings and the plurality of source wirings provided on the second insulating layer. Liquid crystal display for monochrome display, comprising: a signal electrode formed on the second insulating layer adjacent to the signal electrode, and a common electrode for forming an electric field with the signal electrode In the apparatus, the main surface of the second substrate has a surface. A colored layer for adjusting the white balance of the image to be printed is provided, and the colored layer is located between the signal electrode and the common electrode in plan view. is there.

  According to the monochrome display liquid crystal display device of the present invention, it is possible to realize an image display of a color tone desired by an observer of a displayed image.

FIG. 1 is a plan view of a pixel portion of a monochrome display liquid crystal display device according to a first embodiment.
2 is a cross-sectional view taken along line AA of the liquid crystal display device for monochrome display shown in FIG.
3A is a plan view of the first substrate in the pixel portion of the liquid crystal display device for monochrome display shown in FIG. 1, and FIG. 3B is a second view in the pixel portion of the liquid crystal display device for monochrome display shown in FIG. FIG. 6 is a plan view of the substrate.
FIG. 4 is a plan view of a pixel portion of a liquid crystal display device for monochrome display according to Reference Example 1 of the present invention .
FIG. 5 is a cross-sectional view of the monochrome display liquid crystal display device shown in FIG. 4 cut along line BB.
6A is a plan view of the first substrate in the pixel portion of the liquid crystal display device for monochrome display shown in FIG. 4, and FIG. 6B is a second view in the pixel portion of the liquid crystal display device for monochrome display shown in FIG. FIG. 6 is a plan view of the substrate.
FIG. 7 is a cross-sectional view of a liquid crystal display device for monochrome display according to Reference Example 1 of the present invention .
8A is a plan view of the first substrate in the pixel portion of the liquid crystal display device for monochrome display shown in FIG. 7, and FIG. 8B is a second view in the pixel portion of the liquid crystal display device for monochrome display shown in FIG. FIG. 6 is a plan view of the substrate.
FIG. 9 is an explanatory diagram for explaining an arrangement state of a colored layer arranged on a second substrate.
FIG. 10 is an explanatory diagram for explaining another arrangement state of the colored layers arranged on the second substrate.
11A is a plan view of a first substrate in the pixel portion of another example of the monochrome liquid crystal display device shown in FIG. 1, and FIG. 11B is a second view in the pixel portion of the monochrome liquid crystal display device shown in FIG. FIG.
FIG. 12 is an explanatory diagram for explaining another arrangement state of the colored layers arranged on the second substrate.
FIG. 13 is a plan view of a pixel portion of a monochrome liquid crystal display device according to a second embodiment.
14 is a cross-sectional view taken along line CC of the monochrome liquid crystal display device shown in FIG.
FIG. 15 is a plan view of a pixel portion of a monochrome liquid crystal display device according to Reference Example 2 of the present invention .

<Embodiment 1>
A monochrome display liquid crystal display device 1 according to a first embodiment (referred to as a first embodiment) of the present invention will be described below with reference to FIGS.

The liquid crystal display device 1 for monochrome display according to the first embodiment has a configuration as shown in FIGS. 1 to 3, and includes a first substrate 2a and a second substrate 2b that are arranged with their main surfaces facing each other. The liquid crystal layer 3 disposed between the first substrate 2a and the second substrate 2b, the plurality of gate wirings 4 provided on the main surface of the first substrate 2a, and the plurality of gate wirings 4 A plurality of source lines 5 provided via the first insulating layer 6a, a second insulating layer 6b provided so as to cover the plurality of source lines 5, and the second insulating layer 6b. The provided signal electrode 7 provided for each pixel surrounded by the plurality of gate wirings 4 and the plurality of source wirings 5, and provided on the second insulating layer 6 b so as to be adjacent to the signal electrode 7, Mono having an electrode 8 for forming an electric field with the signal electrode 7 In the liquid crystal display device 1 for display, a colored layer 9 for adjusting the white balance of an image to be displayed is provided on the main surface of the second substrate 2b. And located between the signal electrode 7 and the common electrode 8.

  As shown in FIGS. 1 to 3, the monochrome display liquid crystal display device 1 includes a first substrate 2 a and a second substrate 2 b that are disposed with their main surfaces facing each other. A liquid crystal layer 3 is disposed between 2a and the second substrate 2b. The first substrate 2a and the second substrate 2b are made of a light-transmitting material such as a glass substrate or a plastic substrate.

  In the liquid crystal display device 1 for monochrome display, a plurality of gate wirings 4 are provided on the main surface of the first substrate 2a among the main surfaces facing the first substrate 2a and the second substrate 2b. Yes. A plurality of source lines 5 are provided via the first insulating layer 6 a so as to intersect the plurality of gate lines 4. A thin film transistor 2 c is provided in the vicinity of the intersection of the gate line 4 and the source line 5. The first insulating layer 6a is made of an insulating material such as silicon nitride or silicon oxide, for example. Note that the first insulating layer 6a is a gate insulating layer.

  The gate wiring 4 has a function of applying a voltage supplied from a driving semiconductor element (not shown) to the thin film transistor 2c. The source wiring 5 has a function of applying a signal voltage supplied from the driving semiconductor element to the signal electrode 7 through the thin film transistor 2c. The gate wiring 4 or the source wiring 5 is made of, for example, aluminum, molybdenum, titanium, neodymium, chromium, copper, or an alloy containing these.

  A second insulating layer 6 b is provided so as to cover the plurality of source lines 5. The second insulating layer 6b is made of, for example, an insulating material such as silicon nitride or silicon oxide, or an insulating material such as an acrylic resin or an epoxy resin. In addition, the second insulating layer 6b is, for example, a first layer made of an insulating material such as silicon nitride or silicon oxide, and a second layer made of an insulating material such as an acrylic resin or an epoxy resin. It may be composed of two layers.

  The signal electrode 7 is provided for each pixel surrounded by the plurality of gate lines 4 and the plurality of source lines 5 on the second insulating layer 6b. The signal electrode 7 is electrically connected to the thin film transistor 2c through a contact hole. The common electrode 8 is provided on the second insulating layer 6 b so as to be adjacent to the signal electrode 7.

  That is, the liquid crystal display device 1 for monochrome display generates a electric field between the signal electrode 7 and the common electrode 8 provided on the main surface of the first substrate 2a and controls the direction of liquid crystal molecules. It is. The signal electrode 7 and the common electrode 8 are provided so as to be parallel to each other in plan view. The signal electrode 7 and the common electrode 8 are made of a material having translucency and conductivity such as ITO. In the monochrome display liquid crystal display device 1, as shown in FIGS. 1 to 3, the common electrode 8 is provided on both sides of one signal electrode 7. However, the present invention is not limited to this. For example, two signal electrodes 7 may be provided, and the common electrode 8 may be provided on both sides of each signal electrode 7.

  Further, an alignment film (not shown) subjected to an alignment process is provided on each of the opposing surfaces of the first substrate 2a and the second substrate 2b, and a liquid crystal is disposed between the alignment films. Has been. The alignment film is made of a material such as polyimide resin, for example. Moreover, the film thickness of the alignment film is, for example, 0.04 (μm) to 0.1 (μm).

  In the monochrome display liquid crystal display device 1, a polarizing plate (not shown) is disposed on the outer surface opposite to the facing surfaces of the first substrate 2a and the second substrate 2b. The light source device 11 is disposed outside the polarizing plate on the first substrate 2a side. The light source device 11 uses, for example, a cold cathode tube or an LED element as a light source.

  Here, the colored layer 9 is provided on the main surface of the second substrate 2b in order to adjust the white balance of the image displayed on the monochrome display liquid crystal display device 1. The colored layer 9 is located between the signal electrode 7 and the common electrode 8 in plan view. The colored layer 9 has a function of transmitting only a specific wavelength of visible light, and is provided in parallel to the signal electrode 7 or the common electrode 8, but is not limited thereto. The colored layer 9 only needs to be positioned between the signal electrode 7 and the common electrode 8.

  Further, due to the influence of the light source device 11 and the like, the region between the signal electrode 7 and the common electrode 8 is an area that is easily colored yellow, for example. Therefore, by disposing the colored layer 9 between the signal electrode 7 and the common electrode 8, the monochrome display liquid crystal display device 1 can effectively adjust the color tone.

  Light that has entered the liquid crystal display device 1 for monochrome display from the light source device 11 is colored by being transmitted through the colored layer 9. Therefore, the color tone of the image display of the monochrome display liquid crystal display device 1 is determined by the colored layer 9. The colored layer 9 is, for example, a colored resist used for a color filter of a liquid crystal display device, and is a resin to which a dye or pigment is added. The colored layer 9 is provided, for example, on the main surface of the second substrate 2b by photolithography.

  In order to display an image having a color tone desired by the observer of the displayed image, the monochrome display liquid crystal display device 1 has, for example, a blue-based color layer appropriately provided with a colored layer 9 that becomes a blue base. It is selected and provided between the signal electrode 7 and the common electrode 8 on the main surface of the second substrate 2b. In the case of a green-based color tone, a colored layer 9 that can be a green base is appropriately selected and provided between the signal electrode 7 and the common electrode 8 on the main surface of the second substrate 2b. That is, the liquid crystal display device 1 for monochrome display can adjust the white balance of the displayed image by providing the colored layer 9 on the main surface of the second substrate 2b.

  For example, when the monochrome display liquid crystal display device 1 displays an image in a blue-based color tone, the chromaticity coordinates for white display in which the image is displayed are the coordinate points (x, y) on the CIE chromaticity diagram. , 0.26 <x <0.3 and 0.265 <y <0.305.

  Therefore, by adjusting the colored layer 9 having a blue-based color tone, the liquid crystal display device 1 for monochrome display can have a blue-based color tone that falls within the above-described range. The chromaticity at the time of white display is adjusted by, for example, the content of a blue dye or pigment added to the colored layer 9, the film thickness of the colored layer 9, the area occupied by the colored layer 9 in the pixel, or the like. be able to.

  For example, the thickness of the colored layer 9 is 0.8 (μm) to 1.2 (μm), and the coordinate point (x, y) on the CIE chromaticity diagram is 0.16 <x <0.18, In the case of 0.165 <y <0.185, in order to make white display within the above-described range, the area occupied by the colored layer 9 provided in the pixel is the aperture area (light source) of the pixel. The range of 15% to 45% is set with respect to the light transmission region of the device 11. In this case, the chromaticity of the light source device 11 is (0.31, 0.32) at the coordinate point (x, y) on the CIE chromaticity diagram.

  In the monochrome display liquid crystal display device 1, the colored layer 9 is provided in a quadrangular shape on the main surface of the second substrate 2b, but the shape of the colored layer 9 is not limited thereto. For example, as shown in FIG. 11, the colored layer 9 can be provided in a circular shape on the main surface of the second substrate 2b. Thus, by providing the colored layer 9 in a circular shape, a region where the colored layer 9 is not provided can be reduced, and the flatness can be improved by the third insulating layer 6c.

  Further, by providing the colored layer 9 in a circular shape, the colored layer 9 can be uniformly arranged in the pixel. Therefore, it can be suppressed that the colored layer 9 is visually recognized in the pixel in the white display, that is, the image display looks rough. The colored layer 9 may have any shape as long as it can be disposed between the signal electrode 7 and the common electrode 8. The number of the circular colored layers 9 is appropriately selected and provided.

  On the main surface of the second substrate 2b, as shown in FIG. 3B, the light shielding layer 10 is provided in a lattice shape along the outer periphery of the pixel. The material of the light shielding layer 10 is made of, for example, a resin material to which a dye or pigment having high light shielding properties is added, or a metal material such as chromium or chromium oxide.

  The colored layer 9 and the light shielding layer 10 provided on the main surface of the second substrate 2b are covered with a third insulating layer 6c. The third insulating layer 6c is, for example, an acrylic resin, an epoxy resin, a polyimide resin, or the like, and a planarizing film for planarizing the second substrate 2b on which the colored layer 9 and the light shielding layer 10 are provided. It is. The film thickness of the third insulating layer 6c is set in the range of 1 (μm) to 3 (μm), for example, in order to planarize the second substrate 2b on which the colored layer 9 and the light shielding layer 10 are provided. The

  In order to improve the flatness of the second substrate 2b, the colored layer 9 and the light shielding layer 10 are preferably provided with the same thickness. The same film thickness means that the thickness of the colored layer 9 is within a range of ± 20% with respect to the thickness of the light shielding layer 10.

  In the monochrome display liquid crystal display device 1, as shown in FIGS. 1 to 3, the colored layer 9 of the same color is provided in the pixel, but the colored layer 9 is formed as shown in FIG. The first colored layer 9a and the first colored layer 9a can be composed of different colored second layers 9b. The first colored layer 9a and the second colored layer 9b are provided independently between the signal electrode 7 and the common electrode 8, respectively.

  Therefore, even when it is difficult to adjust the color tone of the image display with one color, the color layer 9 is composed of the first color layer 9a and the second color layer 9b having different colors, so that the color tone of the image display is adjusted in a wide range. can do. Moreover, although the 1st colored layer 9a and the 2nd colored layer 9b are provided in square shape, not only this but circular shape etc. may be sufficient.

  That is, in the liquid crystal display device 1 for monochrome display, the colored layer 9 includes the first colored layer 9a and the second colored layer 9b between the signal electrode 7 and the common electrode 8, as shown in FIG. May be provided independently of each other. In this case, the colored layer 9 is, for example, a colored resist in which the first colored layer 9a has a blue-based color tone, and the second colored layer 9b is a colored resist having a green-based color tone. The color tone of the colored resists of the first colored layer 9a and the second colored layer 9b is appropriately selected depending on the desired color tone of image display. The position where the first colored layer 9a and the second colored layer 9b are provided or the area occupied in the pixel of the first colored layer 9a and the second colored layer 9b is not limited to this, and the liquid crystal for monochrome display The display device 1 is appropriately selected and provided so as to have a desired color tone.

For example, in the liquid crystal display device 1 for monochrome display, when the first colored layer 9a is a colored resist having a blue-based color tone, and further, the second colored layer 9b is a colored resist having a green-based color tone. Is a coordinate point (x, y) on the CIE chromaticity diagram, and the chromaticity coordinates at the time of white display are 0.24 <x <0.26 and 0.295 <y <0.315. Set to be within range.

  For example, the thickness of the first colored layer 9a is 0.8 (μm) to 1.2 (μm), and the thickness of the second colored layer 9b is 0.8 (μm) to 1.2 (μm). And at the coordinate point (x, y) on the CIE chromaticity diagram, the first coloring layer 9a has 0.16 <x <0.18, 0.165 <y <0.185, and the second coloring. When the layer 9b is in the range of 0.33 <X <0.35 and 0.535 <y <0.555, it is provided in the pixel in order to make the white display in the above range. The area of the colored layer 9 is 40% to 60% for the first colored layer 9a and 25% to 45% for the second colored layer 9b with respect to the opening area of the pixel (area through which light from the light source device 11 is transmitted). % Range is set. In this case, the chromaticity of the light source device 11 is (0.31, 0.32) at the coordinate point (x, y) on the CIE chromaticity diagram.

  Therefore, by adjusting the first colored layer 9a and the second colored layer 9b, the monochrome display liquid crystal display device 1 can set the color tone within the above-described range. The chromaticity at the time of white display is, for example, the content of blue or green dyes or pigments added to the first colored layer 9 and the second colored layer 9b, the first colored layer 9a and the first colored layer 9b. The thickness of the second colored layer 9b or the occupied area in the pixel of the first colored layer 9a and the second colored layer 9b can be adjusted.

  In order to improve the flatness of the second substrate 2b, it is preferable that the first colored layer 9a and the second colored layer 9b have the same thickness. The same film thickness means that the film thickness of the second colored layer 9b is within a range of ± 20% with respect to the film thickness of the first colored layer 9a.

  In order to improve the flatness of the second substrate 2b, it is preferable that the first colored layer 9a, the second colored layer 9b, and the light shielding layer 10 have the same thickness. The same film thickness means that the film thickness of the first colored layer 9a and the second colored layer 9b is within a range of ± 20% with respect to the film thickness of the light shielding layer 10.

  For example, in the monochrome display liquid crystal display device 1, when the above-described colored layer 9 is not provided, the color display of the light source of the light source device 11 is easily reflected in the image display of the monochrome display liquid crystal display device 1. Therefore, in order to adjust the color tone of the image display of the liquid crystal display device 1 for monochrome display, for example, it is necessary to adjust the color tone of the light source of the light source device 11, and there is a degree of freedom in adjusting the color tone of the image display. not high.

  However, in the liquid crystal display device 1 for monochrome display, in order to adjust the white balance of the image displayed on the main surface of the second substrate 2b, the colored layer 9 has the signal electrode 7 and the common electrode 8 in plan view. The color tone of the image display can be adjusted by the colored layer 9.

  As a result, the monochrome display liquid crystal display device 1 is provided with the colored layer 9 on the main surface of the second substrate 2b, and the formation conditions of the colored layer 9, for example, the chromaticity of the colored layer 9, the film of the colored layer 9 The color tone of the image display can be adjusted to the color tone desired by the viewer of the image by adjusting the thickness or the area occupied by the colored layer 9 within the pixel. Therefore, the liquid crystal display device 1 for monochrome display has a high degree of freedom for adjusting the color tone of image display.

  The present invention is not limited to the first embodiment described above, and various modifications and improvements can be made without departing from the scope of the present invention. Hereinafter, other embodiments will be described. Note that, among the liquid crystal display devices according to other embodiments, the same portions as those of the liquid crystal display device 1 for monochrome display according to the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

< Reference Example 1 of the Present Invention >
Hereinafter, a liquid crystal display device 1A for monochrome display according to Reference Example 1 of the present invention will be described with reference to FIGS.

A liquid crystal display device 1A for monochrome display according to Reference Example 1 is configured as shown in FIGS. 4 to 6, and includes a first substrate 2a and a second substrate 2b arranged with their main surfaces facing each other, Crosses the liquid crystal layer 3 disposed between the first substrate 2a and the second substrate 2b, the plurality of gate wirings 4 provided on the main surface of the first substrate 2a, and the plurality of gate wirings 4. The plurality of source lines 5 provided via the first insulating layer 6a, the second insulating layer 6b provided so as to cover the plurality of source lines 5, and the second insulating layer 6b. The signal electrode 7 provided for each pixel surrounded by the plurality of gate wirings 4 and the plurality of source wirings 5, and the signal provided on the second insulating layer 6b so as to be adjacent to the signal electrode 7 Monochrome provided with a common electrode 8 for forming an electric field with the electrode 7 In the display liquid crystal display device 1, a colored layer 9 for adjusting the white balance of the displayed image is provided on the main surface of the second substrate 2 a, and the colored layer 9 is viewed in plan view. Part of it overlaps with the signal electrode 7.

  In the monochrome display liquid crystal display device 1 </ b> A, as shown in FIG. 4, the colored layer 9 partially overlaps the signal electrode 7 in plan view. Thereby, the color tone of the image display can be adjusted by the colored layer 9. Further, although the colored layer 9 is provided so as to overlap the signal electrode 7 in parallel, the color layer 9 is not limited thereto. The colored layer 9 may be provided so as to overlap the signal electrode 7 with an angle. The colored layer 9 may partially overlap the signal electrode 7 and partially overlap the common electrode 8 in plan view.

  In the monochrome display liquid crystal display device 1 </ b> A, the colored layer 9 partially overlaps the signal electrode 7 in a plan view, and therefore the region where the colored layer 9 is not provided between the signal electrode 7 and the common electrode 8. Becomes larger. Thus, the monochrome display liquid crystal display device 1A can suppress a decrease in luminance.

  The colored layer 9 partially overlaps with the signal electrode 7 in plan view, and the other part is provided between the signal electrode 7 and the common electrode 8. Since the signal electrode 7 has a lower transmittance than the region between the signal electrode 7 and the common electrode 8, the colored layer 9 includes the colored layer 9 and the signal electrode 8 in order to obtain a desired color tone of image display. The area provided between the signal electrode 7 and the common electrode 8 can be made larger than the overlapping area. Thereby, the space between the colored layer 9 and the common electrode 8 becomes narrow, and the flatness of the second substrate 2b can be improved.

  In the monochrome display liquid crystal display device 1A, the colored layer 9 is provided in a quadrangular shape on the main surface of the second substrate 2b. However, the shape of the colored layer 9 is not limited thereto. For example, as shown in FIG. 12A, the colored layer 9 can be provided in a circular shape on the main surface of the second substrate 2b. Thus, by providing the colored layer 9 in a circular shape, a region where the colored layer 9 is not provided can be reduced, and the flatness can be improved by the third insulating layer 6c.

  Further, by providing the colored layer 9 in a circular shape, the colored layer 9 can be uniformly arranged in the pixel. Therefore, it can be suppressed that the colored layer 9 is visually recognized in the pixel in the white display, that is, the image display looks rough.

In the monochrome display liquid crystal display device 1A, as shown in FIG. 4 to FIG. 6, the colored layer 9 of the same color is provided in the pixel, but the colored layer 9 is the first layer as shown in FIG. The colored layer 9a and the first colored layer 9a can be composed of different second colored layers 9b. And first
The colored layer 9 a and the second colored layer 9 b are provided independently between the signal electrode 7 and the common electrode 8. Even if it is difficult to adjust the color tone of the image display with one color, the color layer 9 is composed of the first color layer 9a and the second color layer 9b having different colors, so that the color tone of the image display is adjusted in a wide range. be able to.

  In other words, in the monochrome display liquid crystal device 1A, the colored layer 9 may be provided with the first colored layer 9a and the second colored layer 9b independently as shown in FIG. In this case, the colored layer 9 is, for example, a colored resist in which the first colored layer 9a has a blue-based color tone, and the second colored layer 9b is a colored resist having a green-based color tone. The color tone of the colored resists of the first colored layer 9a and the second colored layer 9b is appropriately selected depending on the desired color tone of image display. Further, the position where the first colored layer 9a and the second colored layer 9b are provided or the occupied area of the first colored layer 9a and the second colored layer 9b is not limited thereto. The monochrome display liquid crystal display device 1A is appropriately selected and provided so as to have a desired color tone.

  Further, as shown in FIGS. 7 and 8, the monochrome display liquid crystal display device 1B can be applied together with the first embodiment added to the monochrome display liquid crystal display device 1A. That is, the colored layer 9 is provided so as to overlap the signal electrode 7, and can also be disposed between the signal electrode 7 and the common electrode 8. Thereby, the colored layer 9 can be provided in a large area in the pixel. In this case, in the monochrome display liquid crystal display device 1B, as shown in FIG. 12B, the colored layer 9 can be provided in a circular shape on the main surface of the second substrate 2b.

  Further, as shown in FIG. 9B, the liquid crystal display device 1B for monochrome display includes the colored layer 9 with the second colored layer 9b having a different color from the first colored layer 9a and the first colored layer 9a. Can be configured. And the 1st colored layer 9a and the 2nd colored layer 9b can be provided independently, respectively. Even when it is difficult to adjust the color tone of the image display with one color, the color layer 9 is composed of the first color layer 9a and the second color layer 9b having different colors, so that the color tone of the image display is adjusted in a wide range. can do.

  Further, as shown in FIG. 9B, the colored layer 9 is provided with the first colored layer 9a and the second colored layer 9b independently, but the first colored layer 9a and the second colored layer 9b are provided independently. The position where the colored layer 9b is provided or the area occupied by the first colored layer 9a and the second colored layer 9b in the pixel is not limited thereto. The first colored layer 9a and the second colored layer 9b are appropriately selected and provided so that the monochrome display liquid crystal display device 1B has a desired color tone.

<Embodiment 2 >
Hereinafter, a monochrome display liquid crystal display device 1 </ b > C according to a second embodiment (referred to as a second embodiment) of the present invention will be described with reference to FIGS. 13 and 14.

Monochrome display liquid crystal display device 1C according to the second embodiment has a configuration as shown in FIGS. 13 and 14, unlike Embodiment 1 and Reference Example 1 embodiment, the light blocking layer 10 on the first substrate 2a Is provided.

  In this way, by providing the light shielding layer 10 on the first substrate 2a, the light shielding layer 10 can effectively shield the edge of the metal wiring such as the gate wiring 4 or the source wiring 5 and thus light scattering. Is generated at the end of a metal wiring such as the gate wiring 4 or the source wiring 5, it is possible to suppress a decrease in contrast. Further, external light and incident light from the light source device 11 are not easily incident on the thin film transistor 2c, and light leakage of the thin film transistor 2c can be suppressed.

< Reference Example 2 of the Present Invention >
Hereinafter, a liquid crystal display device 1D for monochrome display according to Reference Example 2 of the present invention will be described with reference to FIG. FIG. 15 shows an arrangement state of the signal electrode 7 and the common electrode 8 of one pixel.

The liquid crystal display device 1D for monochrome display according to Reference Example 2 has a configuration as shown in FIG. In the monochrome display liquid crystal display device 1A of Reference Example 1 , the colored layer 9 partially overlaps the signal electrode 7 in plan view. However, in the monochrome display liquid crystal display device 1D, the colored layer 9 is formed as shown in FIG. As shown in FIG. 3, a part of the electrode overlaps the common electrode 8 in plan view. In this configuration, a colored layer 9 that overlaps the signal electrode 7 may be further provided.

  Therefore, in the monochrome display liquid crystal display device 1D, the colored layer 9 is provided so as to overlap the common electrode 8 in a plan view, so that the color tone of the image display can be adjusted by the colored layer 9.

  In the monochrome display liquid crystal display device 1D, the common electrodes 8 are provided on both sides of the three signal electrodes, but the present invention is not limited thereto. For example, two signal electrodes 7 may be provided, and the common electrode 8 may be provided on both sides of each signal electrode 7.

The present invention is not particularly limited to the first embodiment or the second embodiment described above, and various modifications and improvements can be made within the scope of the present invention.

1, 1A, 1B, 1C, 1D Monochrome display liquid crystal display device 2a First substrate 2b Second substrate 2c Thin film transistor 3 Liquid crystal layer 4 Gate wiring 5 Source wiring 6a First insulating layer 6b Second insulating layer 6c First 3 insulating layer 7 signal electrode 8 common electrode 9 colored layer 9a first colored layer 9b second colored layer 10 light shielding layer 11 light source device

Claims (2)

A first substrate and a second substrate arranged with their main surfaces facing each other; a liquid crystal layer arranged between the first substrate and the second substrate; and the main substrate of the first substrate A plurality of gate wirings provided on the surface, a plurality of source wirings provided via a first insulating layer so as to cross the plurality of gate wirings, and a plurality of source wirings provided to cover the plurality of source wirings A second insulating layer, a signal electrode provided on the second insulating layer, provided for each pixel surrounded by the plurality of gate wirings and the plurality of source wirings, and adjacent to the signal electrode A monochrome display liquid crystal display device including a common electrode provided on the second insulating layer to form an electric field with the signal electrode,
On the main surface of the second substrate, a colored layer for adjusting the white balance of an image to be displayed is provided, and the colored layer includes the signal electrode and the common electrode in a plan view. A liquid crystal display device for monochrome display, which is located between the two. The liquid crystal display device for monochrome display according to claim 1 ,
The colored layer includes a first colored layer and a second colored layer having a color different from that of the first colored layer, and the first colored layer and the second colored layer are independent of each other. A liquid crystal display device for monochrome display, which is provided.

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