WO2012161060A1

WO2012161060A1 - Display device

Info

Publication number: WO2012161060A1
Application number: PCT/JP2012/062574
Authority: WO
Inventors: 了基伊藤; 吉田　昌弘
Original assignee: シャープ株式会社
Priority date: 2011-05-24
Filing date: 2012-05-17
Publication date: 2012-11-29

Abstract

The present invention provides a display device wherein chroma adjustment pixels are formed with good precision, and differences arising from color filters are small. The present invention comprises: a substrate; a first pixel which is configured including a first color filter; a second pixel which is configured including a second color filter of a different color from the first color filter; a third pixel which is configured including a third color filter of a different color from the first and second color filters; and a fourth pixel which is configured including two or more color filters. The first, second, and third color filters, and the two or more color filters included in the fourth pixel, are formed upon the substrate. The first, second, third, and fourth pixels are pixels of mutually differing colors. The two or more color filters included in the fourth pixel are each the same colors as any of the first, second, or third color filters. The two or more color filters included in the fourth pixel are mutually different colors and positioned mutually in plane view.

Description

Display device

The present invention relates to a display device. More specifically, the present invention relates to a display device including four or more color pixels.

Display devices such as liquid crystal display devices are widely used in electronic devices such as monitors, projectors, mobile phones, and personal digital assistants (PDAs). These display devices usually include a color filter substrate for displaying an image or video in color.

The color filter substrate usually includes color filters of red (R), green (G) and blue (B) which are the three primary colors of light, and each color filter (color layer) is one pixel (sub-pixel). It is arranged to correspond to. The light is transmitted through these color filters, and the display device performs color display. In a display device, a wide chromaticity range is required to display a desired image or video. From such a viewpoint, various devices have been tried for the color filter substrate. For example, the color layer of the main color of the sub-pixel and the sub-pixel in a region facing the opening of at least one sub-pixel of the three sub-pixels so that the chromaticity range can be easily changed A liquid crystal display comprising a substrate on which three color layers are repeatedly arranged in a predetermined pattern with three subpixels as a unit so that adjacent color layers extending from adjacent subpixels are arranged An apparatus is known (for example, refer to Patent Document 1). In addition, a liquid crystal display having a color filter thin film provided with a chromaticity adjustment region is known (for example, see Patent Document 2). Furthermore, a color filter for liquid crystal display, etc., which constitutes a primary color filter by overlapping yellow (Y), cyan (C), and magenta (M) color filters in two layers is also known (for example, Patent Documents 3 and 4).

JP 2009-237484 A JP 2005-141180 A JP-A-10-307205 Japanese Patent Laid-Open No. 11-337725

However, as in the liquid crystal display device described in Patent Document 1, the color filter arranged in a certain subpixel (first subpixel) is replaced with another subpixel (second subpixel) adjacent to the first subpixel. ), The area of the extended color filter in the second subpixel is smaller than the areas of the other color filters mainly arranged in the second subpixel. When the pitch of the sub-pixels is narrow, the area becomes particularly small, so that it is difficult to extend the color filter with high accuracy. Similarly, when the chromaticity adjustment region is formed in the color filter thin film as in the liquid crystal display described in Patent Document 2, it is difficult to form a hole pattern serving as the chromaticity adjustment region when the pixel size is reduced. It becomes. Further, like the color filter for liquid crystal display described in

Patent Documents

3 and 4, when the color filter is adjusted by overlapping the color filter in two layers, the color filter layer and the color of the two layers are arranged. The cell thickness differs from the region where the filter is arranged, and the alignment of the liquid crystal is disturbed. Therefore, the color filter in the conventional display device has room for improvement in these respects.

An object of the present invention is to provide a display device in which pixels for chromaticity adjustment are formed with high accuracy and a step difference due to a color filter is small.

The inventors of the present invention have made various studies on a display device in which pixels for chromaticity adjustment are accurately formed and have a small step due to a color filter, and have focused attention on a configuration including pixels of four or more colors. Then, instead of adjusting the chromaticity in the pixels of the three main colors (for example, three primary colors of R, G, and B), a pixel for adjusting the chromaticity (fourth pixel) separately from these pixels. ) Was added. As a result, chromaticity adjustment can be performed by appropriately combining color filters in the fourth pixel, and it has been found that the difference in area for each color filter does not become extremely large in the fourth pixel. Furthermore, in the fourth pixel, a plurality of color filters of different colors are not overlapped and mixed, but are arranged so as to be aligned with each other when viewed in plan. As a result, it is possible to adjust the chromaticity by mixing the light that has passed through each color filter, and to find that the level difference caused by the color filter can be reduced in the fourth pixel, and to solve the above-mentioned problems in an excellent manner. The present inventors have arrived at the present invention by conceiving what can be done.

That is, one aspect of the present invention includes a substrate, a first pixel including a first color filter, and a second color filter having a color different from that of the first color filter. A second pixel, a third pixel configured to include a third color filter of a color different from the first and second color filters, and a second pixel configured to include two or more color filters. 4 pixels, and the first, second and third color filters, and the two or more color filters included in the fourth pixel are formed on the substrate, and the first, second, The second, third, and fourth pixels are pixels of different colors, and each of the two or more color filters included in the fourth pixel is any of the first, second, and third color filters. Is the same color as the above, and is included in the fourth pixel The two or more color filters are different colors, a display device are arranged alongside one another in a plan view.

In this specification, a picture element is a basic unit for display, and a pixel is an element constituting the picture element. That is, the picture element includes a plurality of color pixels. In the display device, the picture element is formed including the first to fourth pixels. According to the display device, by forming a picture element having four or more color pixels as a minimum repeating unit, a display with higher definition than a display device including a picture element having three color pixels as a minimum repeating unit. Is possible. For example, when an oblique line other than 45 ° is displayed, a smooth line with looseness can be displayed.

In addition, the color filter is usually a process in which an ultraviolet curable resist material is applied to a substrate, a mask is disposed so that only an area where the color filter is formed is irradiated with ultraviolet light, and the resist material is cured by ultraviolet irradiation or the like. It is formed through. This process is repeated for each color of the color filter. However, when the number of colors of the color filter to be used is increased, the process of forming the color filter is correspondingly increased and the cost of the mask and the like is also increased. On the other hand, in the display device, since the fourth pixel is used in combination with two or more color filters having the same color as any of the first, second, and third color filters, each of the first to fourth pixels is used. Compared with the case of using different color filters, the process of forming the color filter can be shortened, and the cost of masks and the like can be reduced. However, in the present invention, the method for forming the color filter is not particularly limited.

Note that the color of the fourth pixel means a color resulting from mixing light (lights of different colors) transmitted through each of the two or more color filters. Therefore, the first, second, third and fourth pixels are pixels having different colors from each other. The colors obtained by mixing the light emitted from the entire areas of the pixels are compared, and the colors are compared. It means different from each other.

Further, the number of color filters (number of colors) included in the fourth pixel is not particularly limited as long as it is 2 or more. For example, it may be 3 or more, but preferably 2 or 3. Thereby, the color of the fourth pixel can be easily set to a color complementary to the color of any of the first to third pixels, or white. Therefore, the chromaticity adjustment can be adjusted more easily.

Each of the first to third pixels may further include a color filter having a different color from the first to third color filters. For the following reason, the first to third pixels may be included. It is preferable not to include a color filter having a color different from that of the color filter. That is, among the first to third pixels, in a pixel configured to further include a color filter having a color different from that of the first to third color filters, a black matrix in a portion where the color filters of different colors are adjacent to each other. (BM), a metal member provided on the TFT substrate, and light shielding by overlapping the end portions of the color filter or the like is necessary, which may cause a decrease in luminance. In addition, when light shielding by a metal member provided on the TFT substrate, for example, light shielding by an auxiliary capacitor bus line, the position of the auxiliary capacitor bus line may vary depending on the pixel. As a result, it is necessary to change the TFT pattern for each pixel, which is troublesome. Furthermore, since the auxiliary capacity bus line cannot be formed in a straight line, the resistance increases. In the case where each of the first to third pixels further includes a color filter having a different color from the first to third color filters, these color filters, like the fourth pixel, It is preferable that they are arranged side by side in a plan view.

Further, each of the first to fourth pixels may be configured to include a colorless and transparent region, but it is preferably not included from the viewpoint of simplifying the manufacturing process and extending the color reproduction range. For example, a colorless and transparent resin layer may be formed in the colorless and transparent region.

In the display device, the number of pixel colors is not particularly limited to four colors, and may be five or more colors. For example, the display device may further include a fifth pixel, or may include fifth and sixth pixels. However, from the viewpoint of simplifying the manufacturing process, the number of colors of the pixels is preferably four colors. When the number of colors of the pixels is 5 or more, the pixels after the fifth pixel can be designed in the same manner as any of the first to fourth pixels.

The configuration of the display device is not particularly limited by other components as long as such components are formed as essential.

Hereinafter, preferred embodiments of the display device will be described in more detail. In addition, the various forms shown below can be combined suitably and the form which combined the following two or more preferable forms with each other is also one of the preferable forms.

The display device further includes a substrate having a pixel electrode, and a vertical alignment type liquid crystal layer sandwiched between the two substrates (more specifically, the substrate and the substrate having the pixel electrode). The pixel electrode includes a fishbone pattern, the fourth pixel has two or more domains, and the first, second, and third color filters are red, green, respectively. And the blue color filter, the first, second, and third pixels are red, green, and blue pixels, respectively, the fourth pixel is a yellow pixel, and the fourth pixel The two or more color filters included in the pixel include a red color filter and a green color filter, and the red color filter and the green color filter included in the fourth pixel are arranged at arbitrary lines or points. In contrast, It is preferred that. Viewing angle characteristics are improved by symmetrically arranging the green and red color filters included in the fourth pixel. In particular, a remarkable effect is obtained in a multi-domain liquid crystal display device.

The fishbone pattern is a pattern imitating the fish bone, preferably a first portion extending in the first direction, and a plurality of second portions branching from the first portion to one side, A plurality of third portions branched from the first portion to the other side, and an angle formed between each direction in which each of the plurality of second portions extends and the first direction is 40 to 50 ° (more preferably The angle formed between each direction in which each of the plurality of third portions extends and the first direction is set to 40 to 50 ° (more preferably 45 °).

The two or more domains are regions having different alignment characteristics (particularly orientation orientation) of liquid crystal molecules, and the number of domains is not particularly limited as long as the number of domains is two or more, but a wide viewing angle and a highly symmetric viewing field. From the viewpoint of realizing angular characteristics, 4 is preferable.

The display device includes a substrate having a pixel electrode and a TN (Twisted Nematic) type liquid crystal layer sandwiched between the two substrates (more specifically, the substrate and the substrate having the pixel electrode). The first, second and third color filters are red, green and blue color filters, respectively, and the first, second and third pixels are red, green and blue, respectively. The fourth pixel is a yellow pixel, and the two or more color filters included in the fourth pixel include a red color filter and a green color filter, It is preferable that the red color filter and the green color filter included in a pixel are arranged symmetrically with respect to an arbitrary line or point. Viewing angle characteristics are improved by symmetrically arranging the green and red color filters included in the fourth pixel. Even in a non-multi-domain TN mode liquid crystal display device, the effect of improving the viewing angle characteristics is exhibited.

In the present invention, red, green, blue, and yellow are defined as follows. That is, “red” means a color having a dominant wavelength of 595 nm to 650 nm, and preferably a color having a dominant wavelength of 600 nm to 640 nm. The red color purity is preferably 40% or more. Similarly, “green” refers to a color having a dominant wavelength of 490 nm to 555 nm, and preferably a color having a dominant wavelength of 510 nm to 550 nm. The green color purity is preferably 40% or more. “Blue” refers to a color having a dominant wavelength of 450 nm to 490 nm, and preferably a color having a dominant wavelength of 450 nm to 475 nm. The color purity of blue is preferably 40% or more. “Yellow” is a color formed by combining red and green wavelengths because it is made of red and green color filters in the present invention. At this time, the area ratio of the red and green color filters may be within a range in which each of the red and green color filters is formed with high accuracy within one pixel. That is, in the present invention, “yellow” A color obtained as a result of forming red and green color filters in one pixel within a range not exceeding the resolution limit. Specifically, as a high-definition pixel pitch, one pixel having a size of about 30 μm × 90 μm is currently known, and a width of about 8 μm is required to form a color filter with high accuracy. In the yellow pixel, the area ratio of the red and green color filters is preferably in the range of 1:10 to 10: 1, more preferably 1: 9 to 9: 1.

The fourth pixel may be a cyan pixel. At this time, the two or more color filters include a green color filter and a blue color filter. Further, the fourth pixel may be a magenta pixel, and the two or more color filters include a red color filter and a blue color filter. In the present invention, “cyan” is a color formed by combining green and blue wavelengths because it is made by a green and blue color filter, and “magenta” is made by a red and blue color filter. Therefore, it refers to a color formed by combining red and blue wavelengths. At this time, the area ratio of the green and blue color filters may be in a range in which each of the green and blue color filters is formed with high accuracy within one pixel. In other words, in the present invention, “cyan” A color obtained as a result of forming green and blue color filters in one pixel within a range not exceeding the resolution limit. Specifically, similarly to the area ratio of the red and green color filters in the above “yellow”, the area ratio of the green and blue color filters in the cyan pixel is preferably 1:10 to 10: 1. More preferably, it is in the range of 1: 9 to 9: 1. In addition, the area ratio of the red and blue color filters may be within a range in which each of the red and blue color filters is formed with high accuracy within one pixel. In other words, in the present invention, “magenta” A color obtained as a result of forming red and blue color filters in one pixel within a range not exceeding the image limit. Specifically, similarly to the area ratio of the red and green color filters in “yellow”, the area ratio of the red and blue color filters in the magenta pixel is preferably 1:10 to 10: 1. More preferably, it is in the range of 1: 9 to 9: 1.

The first, second, third and fourth pixels are arranged in a stripe pattern, and the two or more color filters included in the fourth pixel are arranged in a longitudinal direction of the fourth pixel. Are preferably arranged side by side in the orthogonal direction. At this time, in the fourth pixel, the boundary between the color filters can be reduced.

The first, second, third and fourth pixels are arranged in a stripe pattern, and the two or more color filters included in the fourth pixel are arranged in the longitudinal direction of the fourth pixel. Is preferably arranged. At this time, since the right-angled portion of the color filter (the portion where the contour line is bent at a right angle in plan view) can be reduced, the flatness of the color filters due to the rounding of the right-angled portion when the color filter is formed. Deterioration can be suppressed.

The two or more color filters included in the fourth pixel are preferably arranged symmetrically with respect to an arbitrary line or point. Thereby, viewing angle characteristics are improved.

Preferable specific examples of the arbitrary line or point include a center line or center of a pixel and a center line or center of a domain.

The first, second and third color filters are red, green and blue color filters, respectively, and the first, second and third pixels are red, green and blue pixels, respectively. Preferably, the fourth pixel is a white pixel, and the two or more color filters included in the fourth pixel include a red color filter, a green color filter, and a blue color filter. Thereby, pixels of four colors of red, green, blue and white can be obtained using the color filters of three colors of red, green and blue.

In the present invention, “white” is not formed by a dedicated color filter, but a color formed by combining red, green, and blue wavelengths. At this time, the area ratio of the red, green, and blue color filters may be in a range in which each of the red, green, and blue color filters is formed with high accuracy within one pixel. "Means a color obtained as a result of forming red, green and blue color filters in one pixel within a range not exceeding the resolution limit. Specifically, as a high-definition pixel pitch, one pixel having a size of about 30 μm × 90 μm is currently known, and a width of about 8 μm is required to form a color filter with high accuracy. In the white pixel, the areas of the red, green and blue color filters are each 9% or more of the total area of the red, green and blue color filters, and more preferably 10% or more.

Preferably, at least one of the first, second, third and fourth pixels has an area different from that of the other pixels. The present invention can also be applied to a conventionally known product in which the area of the pixel differs depending on the color.

Any one of the two or more color filters included in the fourth pixel is a fourth color filter, and the same color as the fourth color filter among the first, second, and third pixels. When the pixel including the color filter is a specific pixel, it is preferable that the specific pixel is not arranged next to the fourth pixel (hereinafter also referred to as a first mode). That is, the display device may have a pixel arrangement in which the specific pixel is not adjacent to the fourth pixel.

In the first embodiment, the color filter included in the specific pixel and having the same color as the fourth color filter may not be connected to the fourth color filter. Accordingly, the shapes of the fourth color filter and the color filter included in the specific pixel can be simplified.

In the first embodiment, the color filter included in the specific pixel and having the same color as the fourth color filter is connected to the fourth color filter outside the region of the fourth pixel and the specific pixel. May be. By connecting the fourth color filter to the color filter included in the specific pixel, it is possible to improve the finishing accuracy and prevent the deterioration of the pattern accuracy from being concentrated on the specific color.

At this time, the display device further includes a fifth color filter continuously connected to the fourth color filter, and a sixth color filter having a color different from that of the fourth and fifth color filters. The sixth color filter has a color different from that of the color filter disposed around the sixth color filter and is not connected to each other, and the fifth and sixth color filters are mutually connected. It is preferable that they are laminated. In order to stack the color filters with high accuracy, it is necessary that the area of the color filter serving as the base is sufficiently wide, but by connecting the fourth color filter and the fifth color filter, It can be used as a sufficiently wide base. This makes it possible to accurately form the stacked pillars based on the fourth and fifth color filters, and in the liquid crystal display device, the cell thickness can be made uniform.

A portion (connecting portion) included in the specific pixel and connected to the color filter of the same color as the fourth color filter and the fourth color filter is connected to the fifth color filter. It is more preferable that it is connected to. In this way, the fifth color filter is connected to the connection portion in addition to the fourth color filter, so that the fourth and fifth color filters and the connection portion are used as a base. be able to. Therefore, the base can be further widened.

The display device further includes a light shielding unit, and the light shielding unit shields (superimposes) a portion where the two or more (two or more colors) color filters included in the fourth pixel are adjacent to each other. Preferred (hereinafter also referred to as the second form). Thereby, it is possible to prevent a gap from being generated between the two or more color filters and a contrast ratio from being lowered.

In the second aspect, it is preferable that the display device further includes a substrate having metal wiring, and the light shielding portion includes the metal wiring. As a result, a step due to the light shielding member does not occur on the surface of the color filter substrate, so that liquid crystal alignment is hardly disturbed in the liquid crystal display device, and high contrast can be achieved.

In the second embodiment, the substrate on which the first, second, and third color filters and the two or more color filters included in the fourth pixel are formed further includes a black matrix, and the light shielding The part preferably includes at least a part of the black matrix. Thereby, it is possible to effectively shield light between the two or more color filters.

At this time, it is preferable that end portions of the two or more (two or more colors) color filters included in the fourth pixel overlap the at least part of the black matrix. Thereby, it is possible to prevent a gap from being generated between the black matrix and the color filter in the fourth pixel. At this time, since the area of the black matrix can be reduced as compared with a mode in which the color filter does not overlap with the black matrix, a high aperture ratio can be achieved. On the other hand, the end portions of the two or more (two or more colors) color filters included in the fourth pixel may not overlap the at least part of the black matrix. At this time, the step difference of the substrate on which the color filter is arranged can be further reduced, so that in the liquid crystal display device, alignment disorder can be suppressed and high contrast can be achieved.

Of the two or more (two or more colors) color filters included in the fourth pixel, it is preferable that ends of two color filters adjacent to each other overlap each other. Accordingly, it is possible to prevent a contrast ratio from being lowered due to a gap between the two or more color filters without newly forming a light shielding member.

The display device further includes a substrate having a pixel electrode, and a vertical alignment type liquid crystal layer sandwiched between the two substrates (more specifically, the substrate and the substrate having the pixel electrode). The liquid crystal layer includes liquid crystal molecules, and the substrates on which the first, second, and third color filters and the two or more color filters included in the fourth pixel are formed, Includes two or more structures that control the alignment of the liquid crystal molecules, each of the two or more structures is formed in a dot shape, and the pixel electrode is two or more electrodes facing the two or more structures It is preferable that the two or more (two or more colors) color filters included in the fourth pixel are provided to face the two or more electrode portions. The present invention is also suitable for a liquid crystal display device in a so-called CPA (ContinuousmentPinwheel Alignment) mode.

The display device includes a first pixel electrode, a second pixel electrode, a substrate having a capacitor and a switching element, the two substrates (more specifically, the substrate, the first pixel electrode, and the second pixel). A liquid crystal layer sandwiched between the pixel electrode and the capacitor and the substrate having the switching element), and the first pixel electrode is connected to the switching element, and the second pixel electrode Is preferably connected to the first pixel electrode through the capacitor (hereinafter also referred to as a third embodiment). The present invention is also suitably applied to a liquid crystal display device including a first pixel electrode directly connected to a switching element and a second pixel electrode not directly connected to the switching element but connected via a capacitor. it can. In general, one terminal of the capacitor is electrically connected to the first pixel electrode, the other terminal of the capacitor is electrically connected to the second pixel electrode, and the second pixel. The potential of the electrode changes according to the potential change of the first pixel electrode.

In the third embodiment, the first pixel electrode and the second pixel electrode are arranged side by side in a plan view, and the two or more (two or more colors) color filters included in the fourth pixel. At least one of them preferably covers a part of the first pixel electrode on the second pixel electrode side and a part of the second pixel electrode on the first pixel electrode side. Since the first pixel electrode side and the second pixel electrode side are multi-domained, color filters of the same color are arranged on a part on the first pixel electrode side and a part on the second pixel electrode side. Thus, the viewing angle characteristics can be improved.

Note that among the color filters described above, the color filters of the same color may be connected to each other or not connected to each other unless otherwise specified. However, from the viewpoint of reducing the right-angled portion of the color filter, the color filters that are the same color and are adjacent to each other among the above-described color filters are connected to each other in a continuous manner unless otherwise specified. In other words, it is preferably formed integrally.

According to the present invention, it is possible to obtain a display device in which pixels for chromaticity adjustment are formed with high accuracy and the level difference due to the color filter is small.

3 is a schematic plan view of the first display device according to Embodiment 1. FIG. 3 is a schematic plan view of a second display device according to Embodiment 1. FIG. FIG. 6 is a schematic plan view of a display device in which RGBY pixels are arranged in stripes. 6 is a schematic plan view of a TFT substrate of a liquid crystal display device according to Embodiment 2. FIG. 6 is a schematic plan view of a color filter substrate of a liquid crystal display device according to Embodiment 2. FIG. In the liquid crystal display device which concerns on Embodiment 2, it is a plane schematic diagram after bonding a TFT substrate and a color filter substrate together. 6 is a schematic plan view of a TFT substrate of a liquid crystal display device according to Embodiment 3. FIG. 6 is a schematic plan view of a color filter substrate of a liquid crystal display device according to Embodiment 3. FIG. In the liquid crystal display device which concerns on Embodiment 3, it is a plane schematic diagram after bonding a TFT substrate and a color filter substrate together. 10 is a schematic plan view of a color filter substrate of a liquid crystal display device according to Embodiment 4. FIG. In the liquid crystal display device which concerns on Embodiment 4, it is a plane schematic diagram after bonding a TFT substrate and a color filter substrate together. 6 is a schematic plan view of a TFT substrate of a liquid crystal display device according to Embodiment 5. FIG. 10 is a schematic plan view of a color filter substrate of a liquid crystal display device according to Embodiment 5. FIG. In the liquid crystal display device which concerns on Embodiment 5, it is a plane schematic diagram after bonding a TFT substrate and a color filter substrate together. 10 is a schematic plan view of a display device according to Embodiment 6. FIG. 10 is a schematic plan view of a TFT substrate of a liquid crystal display device according to Embodiment 7. FIG. 10 is a schematic plan view of a color filter substrate of a liquid crystal display device according to Embodiment 7. FIG. In the liquid crystal display device which concerns on Embodiment 7, it is a plane schematic diagram after bonding a TFT substrate and a color filter substrate together. FIG. 10 is a schematic plan view of a TFT substrate of a liquid crystal display device according to an eighth embodiment. 10 is a schematic plan view of a color filter substrate of a liquid crystal display device according to Embodiment 8. FIG. In the liquid crystal display device which concerns on Embodiment 8, it is a plane schematic diagram after bonding a TFT substrate and a color filter substrate together. 10 is a schematic plan view of a TFT substrate of a liquid crystal display device according to Embodiment 9. FIG. 10 is a schematic plan view of a color filter substrate of a liquid crystal display device according to Embodiment 9. FIG. In the liquid crystal display device according to Embodiment 9, it is a schematic plan view after a TFT substrate and a color filter substrate are bonded together. FIG. 10 is a schematic plan view of a first display device according to Embodiment 10. FIG. 12 is a schematic plan view of a second display device according to Embodiment 10. FIG. 10 is a schematic plan view of a third display device according to Embodiment 10. FIG. 12 is a schematic plan view of a fourth display device according to Embodiment 10. FIG. 6 is a schematic plan view of a display device in which RGBW pixels are arranged in a stripe pattern. 14 is a schematic plan view of a TFT substrate of a liquid crystal display device according to Embodiment 11. FIG. 14 is a schematic plan view of a color filter substrate of a liquid crystal display device according to Embodiment 11. FIG. In the liquid crystal display device which concerns on Embodiment 11, it is a plane schematic diagram after bonding a TFT substrate and a color filter substrate together. 14 is a schematic plan view of a TFT substrate of a liquid crystal display device according to Embodiment 12. FIG. 14 is a schematic plan view of a color filter substrate of a liquid crystal display device according to Embodiment 12. FIG. In the liquid crystal display device which concerns on Embodiment 12, it is a plane schematic diagram after bonding a TFT substrate and a color filter substrate together. FIG. 22 is a schematic plan view of a first display device according to Embodiment 13. FIG. 22 is a schematic plan view of a second display device according to Embodiment 13. FIG. 34 is a schematic plan view of a third display device according to Embodiment 13. FIG. 34 is a schematic plan view of a fourth display device according to Embodiment 13. FIG. 34 is a schematic plan view of a fifth display device according to Embodiment 13. FIG. 34 is a schematic plan view of a sixth display device according to Embodiment 13. FIG. 34 is a schematic plan view of a seventh display device according to Embodiment 13. FIG. 18 is a schematic plan view of a color filter substrate of a liquid crystal display device according to Embodiment 14. In the liquid crystal display device which concerns on Embodiment 14, it is a plane schematic diagram after bonding a TFT substrate and a color filter substrate together. FIG. 18 is a schematic plan view of a color filter substrate of a liquid crystal display device according to Embodiment 15. In the liquid crystal display device according to Embodiment 15, it is a schematic plan view after a TFT substrate and a color filter substrate are bonded together. 18 is a schematic plan view of a TFT substrate of a liquid crystal display device according to Embodiment 16. FIG. 18 is a schematic plan view of a color filter substrate of a liquid crystal display device according to Embodiment 16. FIG. In the liquid crystal display device according to Embodiment 16, it is a schematic plan view after a TFT substrate and a color filter substrate are bonded together. 18 is an MVA liquid crystal display device according to Embodiments 1 to 16. FIG. 2 is a schematic cross-sectional view taken along the line AB in FIG. 1. FIG. 2 is a schematic cross-sectional view taken along the line AB in FIG. 1. FIG. 2 is a schematic cross-sectional view taken along the line AB in FIG. 1. FIG. 7 is a schematic cross-sectional view taken along the line CD in FIG. 6. FIG. 10 is a schematic sectional view taken along line EF in FIG. 9. It is a cross-sectional schematic diagram in the GH line | wire of FIG. FIG. 25 is a schematic cross-sectional view taken along line JK in FIG. 24. FIG. 18 is a schematic plan view of a color filter substrate of a liquid crystal display device according to Embodiment 15. FIG. 59 is a schematic sectional view taken along line MN in FIG. 58.

In this specification, red or red is R, green or green is G, blue or blue is B, yellow or yellow is Y, white or white is W, cyan is C, magenta is M, Each may be abbreviated.

Embodiments will be described below, and the present invention will be described in more detail with reference to the drawings. However, the present invention is not limited to these embodiments. In addition, in each embodiment, the same code | symbol is attached | subjected to the member and part which exhibit the same function.

Embodiment 1
Hereinafter, the display device according to the first embodiment will be described in detail.

The display device of Embodiment 1 is a display device having a display medium sandwiched between a TFT substrate and a color filter substrate. When the display medium is a liquid crystal, the display device of Embodiment 1 is a liquid crystal display device. The alignment mode and driving method of the liquid crystal display device are not particularly limited. For example, TN mode, MVA (Multi-domain Vertical Alignment) mode, IPS (In Plane Switching) mode, FFS (Fringe Field Switching) mode, TBA (Transverse Bend (Alignment) mode. In addition, for example, PSA (Polymer Sustained Alignment) technology may be employed, or alignment processing (for example, alignment division) may be performed by a photo-alignment technology. It may be divided into areas and applied with multi-pixels that vary the transmittance for each area. When the display medium is a microcapsule enclosing black and white charged particles, the display device according to the first embodiment is an electronic paper.

The display device according to the first embodiment has a structure in which a pixel composed of pixels of four or more colors is used as a minimum repeating unit, and red (R), green (G), and blue (B) color filters (first, Second and third color filters). Of four or more pixels, three pixels correspond to the primary colors R, G, and B (first, second, and third pixels). The remaining pixels are pixels that perform chromaticity adjustment, and are formed by a combination of two or more primary colors (fourth pixel). 1 and 2 are schematic plan views of the display device according to the first embodiment. As shown in FIG. 1, the display device includes a red pixel 11a having a red color filter 10R, a green pixel 11c having a green color filter 10G, and a blue pixel 11d having a blue color filter 10B. Further, a pixel 11b having

color filters

10R and 10G is provided. In the pixel 11b, the

color filters

10R and 10G are arranged side by side in plan view. The pixel 11b functions as a yellow (Y) pixel by mixing red light that has passed through the color filter 10R and green light that has passed through the color filter 10G. The

pixels

11a, 11b, 11c, and 11d constitute a picture element 12. That is, the

pixels

110a, 110b, 110c, and 110d each having four

color filters

100R, 100G, 100B, and 100Y of R, G, B, and Y as shown in FIG. This is the same as the display device including the element 120. Note that the color of the pixel for which chromaticity adjustment is performed is not limited to Y, and may be cyan (C), magenta (M), white (W), or the like. 1 and 2, the

color filters

10R, 10G, and 10B are described so as to be arranged side by side without overlapping each other on the same plane, but each color filter overlaps at the end. It may be met. In FIG. 1 and FIG. 2, the portion in the pixel 11 a and the portion in the pixel 11 b of the color filter 10 </ b> R are shown connected to each other, but both portions may be disposed separately. Similarly, the part in the pixel 11c and the part in the pixel 11b of the color filter 10G are described as being connected to each other, but both parts may be arranged separately.

The color filter is formed by applying a UV curable resist material containing a conventionally known pigment-based or dye-based coloring material to the substrate, and arranging a mask so that only the region where the color filter is formed is irradiated with UV. It is formed through a step of curing the resist material by irradiation or the like. This process is repeated for each color of the color filter. However, when the number of colors of the color filter to be used is increased, the process of forming the color filter is correspondingly increased and the cost of the mask and the like is also increased. On the other hand, in this embodiment, since the color filter 10R and the color filter 10G are used in combination with the pixel 11b, the process of forming the color filter is shortened, masks, etc., compared with the case where the Y color filter is used for the pixel 11b. The cost can be reduced. In addition, in the pixel 11b, it can be suppressed that the color filter of a specific primary color becomes extremely small and the accuracy of forming the color filter is deteriorated.

In FIG. 1, the

pixels

11a, 11b, 11c, and 11d are formed in a rectangular shape and are arranged side by side in a direction orthogonal to the longitudinal direction of the pixels. In addition, pixels of the same color are arranged in stripes in the vertical direction. The pixels may have a horizontally long pixel structure. At this time, the pixels are arranged in stripes in the horizontal direction. Further, the pixel may have a structure bent in a dogleg shape (V shape).

In FIG. 1, in the pixel 11b, the

color filters

10R and 10G are arranged in the longitudinal direction of the pixel 11b. However, as shown in FIG. 2, in the pixel 11b, the

color filters

10R and 10G are replaced by the pixel 11b. They may be arranged side by side in a direction orthogonal to the longitudinal direction. When aligned in the longitudinal direction, the boundary between the color filter 10R and the color filter 10G can be reduced. On the other hand, when arranged in a direction perpendicular to the longitudinal direction, as shown in FIG. 2, the right-angle portions of the

color filters

10R and 10G can be reduced as compared with FIG. It is possible to suppress the deterioration of flatness between the color filters due to the occurrence. In the pixel 11b, the extending direction of the boundary line between the color filter 10R and the color filter 10G may be parallel to or perpendicular to the short side of the pixel 11b.

Furthermore, in FIG. 1, the area ratios of the

pixels

11a, 11b, 11c, and 11d are equal, but at least one pixel may have an area different from that of the other pixels. For example, in the four color pixels of R, G, B, and Y, the areas of the G and Y pixels (

pixels

11c and 11b) may be smaller than the areas of the R and B pixels (

pixels

11a and 11d).

1 and 2, in the pixel 11b, the boundary line between the

color filters

10R and 10G (the extending direction of the boundary) passes through the center of the pixel 11b. That is, in the pixel 11b, the boundary between the

color filters

10R and 10G. The areas are equal. However, the boundary line (the extending direction of the boundary) between the

color filters

10R and 10G may not pass through the center of the pixel 11b, that is, the areas of the

color filters

10R and 10G may not be equal. By appropriately adjusting the areas of the

color filters

10R and 10G in the pixel 11b, the transmission efficiency and chromaticity can be adjusted. The transmission efficiency indicates a change in transmittance. The transmittance is an absolute value (for example, 5.0%) indicating the ratio of incident light having a specific wavelength passing through the sample. For example, it can be said that the transmission efficiency is improved by 1% when the transmittance is changed from 5.0% to 5.05% by changing the area ratio of the

color filters

10R and 10G.

As described above, instead of changing the color material or film thickness of the color filter, the area ratio of the color filters of a plurality of colors arranged side by side in the chromaticity adjustment pixel (fourth pixel) is changed. Thus, chromaticity adjustment can be realized. More specifically, in the pixel for chromaticity adjustment, the number of overlapping portions of color filters of different colors, the boundary between color filters of different colors, or the positions of gaps existing between color filters of different colors By changing μm, the area ratio of the color filters of a plurality of colors changes, and chromaticity adjustment can be performed. Further, as will be described in detail later in Embodiment 16, signal control can be performed and chromaticity adjustment can be performed in the same manner as a known RGBY display device. Furthermore, the level difference caused by the color filter can be reduced in the chromaticity adjustment pixel.

The display device according to the first embodiment may include a light-shielding portion that shields the portions where the

color filters

10R and 10G are adjacent to each other in the pixel 11b. The light shielding portion may be a black matrix (BM) provided on the color filter substrate or a metal member (for example, an auxiliary capacitor bus line) provided on the TFT substrate. When the light is shielded by the BM provided on the color filter substrate, it is not necessary to consider a bonding shift (= 5 μm, for example) as compared with the case where the light is shielded by the pattern on the TFT substrate side. Can do. On the other hand, when the light is shielded by the metal member on the TFT substrate side, there is no step on the surface of the color filter substrate, so liquid crystal alignment is less disturbed than when the light is shielded by the BM provided on the TFT substrate, and the contrast should be high. Can do. The material of BM is not limited, For example, a metal material may be sufficient and a black resin material may be sufficient. 51 is a schematic cross-sectional view taken along the line AB in FIG. As shown in FIG. 51, the end portions of the

adjacent color filters

10R and 10G on the insulating substrate 21 are overlapped with each other by about 2 μm, for example, to form a light shielding portion, and the light shielding is not performed with the pattern of the BM or TFT substrate. Also good. Thereby, it becomes possible to form a light shielding part without preparing a new material.

52 and 53 are schematic cross-sectional views taken along the line AB of FIG. As shown in FIG. 52, when the BM 20 is provided on the insulating substrate 21 of the color filter substrate, the

color filters

10R and 10G may be arranged on a part of the BM 20 so as to overlap each other. On the other hand, as shown in FIG. 53, the end portions of the

color filters

10R and 10G may be arranged so as not to overlap the BM 20. In the former form, since the area of the BM 20 can be reduced compared to the latter form, a high aperture ratio can be obtained. On the other hand, since the latter form can reduce the level | step difference of a color filter board | substrate, in a liquid crystal display device, alignment disorder can be suppressed and it can be set as high contrast. When BM20 is formed from a black resin material, alignment disorder can be particularly suppressed in the latter form.

The

color filters

10R, 10G, and 10B may be divided for each pixel or may be continuously formed in a stripe shape.

Embodiment 2
As a display device according to Embodiment 2, a TN mode liquid crystal display device (a liquid crystal display device having a TN structure) is shown below. FIG. 4 is a schematic plan view of a TFT substrate of the liquid crystal display device according to the second embodiment. FIG. 5 is a schematic plan view of the color filter substrate of the liquid crystal display device according to the second embodiment. FIG. 6 is a schematic plan view after the TFT substrate and the color filter substrate are bonded together in the liquid crystal display device according to the second embodiment. 54 is a schematic cross-sectional view taken along line CD of FIG. In FIG. 54, illustration of each configuration of the TFT substrate is omitted.

As shown in FIG. 4, the TFT substrate 1 has a transparent insulating substrate, and on the insulating substrate, a first wiring layer, a gate insulating film, a semiconductor layer, a contact layer, a second wiring layer, an insulating layer, a pixel The electrode 40 and the alignment film are formed in this order.

On the insulating substrate, a plurality of data bus lines 32 extending in the vertical direction (vertical direction in FIG. 4) and a plurality of gate bus lines 31 extending in the horizontal direction (horizontal direction in FIG. 4) intersect each other. The region surrounded by the data bus line 32 and the gate bus line 31 is a pixel. A TFT 30 having a source electrode, a drain electrode, and a gate electrode is disposed in the vicinity of each intersection, and the pixel electrode 40 is electrically connected to the drain electrode of the TFT 30 through a contact hole 34. The TFT 30 functions as a switching element. The pixel electrode 40 is formed from a transparent conductive film such as ITO, and is formed in a rectangular shape in accordance with the shape of the pixel. The size of the pixel is not particularly limited. For example, the pixel is formed with a size of 75 μm × 300 μm. The data bus line 32 is connected to the source driver, and the gate bus line 31 is connected to the gate driver. A region defined by the data bus line 32 and the gate bus line 31 corresponds to a pixel. Both the data bus line 32 and the gate bus line 31 are formed in a straight line. On the insulating substrate, an auxiliary capacity bus line 33 extending in the horizontal direction (left-right direction in FIG. 4) is provided. The storage capacitor bus line 33 extends linearly in parallel with the gate bus line 31 so as to pass through the center of the pixel. The auxiliary capacity bus line 33 is a metal wiring and is formed of a metal material such as aluminum. Therefore, the auxiliary capacity bus line 33 also functions as a light shielding part. The gate bus line 31, the gate electrode and the auxiliary capacitance bus line 33 are formed in the first wiring layer, and the data bus line 32, the source electrode and the drain electrode are formed in the second wiring layer. The pixel electrode 40 is an electrode to which an image signal is applied, and is electrically connected to the drain electrode through a contact hole 34 formed in the insulating layer. The alignment film is provided at the interface between the TFT substrate and the liquid crystal layer 3. The surface of the alignment film is rubbed and defines the alignment direction of the nearby liquid crystal molecules.

The source electrode of the TFT 30 is electrically connected to the data bus line 32. The data bus line 32, the source electrode and the drain electrode, and the gate bus line 31 and the gate electrode are electrically insulated by a gate insulating film. The semiconductor layer is formed on the gate bus line 31 via a gate insulating film.

As shown in FIGS. 5 and 54, the color filter substrate 2 includes a transparent insulating substrate 21, and a black matrix (BM) 20 that functions as a light-shielding portion is provided on the insulating substrate 21. The black matrix 20 is formed so as to shield light from the data bus line 32, the TFT 30, the gate bus line 31 and the peripheral area of the TFT substrate 1. Furthermore, a color filter 10R, a color filter 10G, and a color filter 10B are provided on the insulating substrate 21. As shown in FIG. 5, the color filter 10R is arranged on the upper half of the pixel 11a and the pixel 11b, and the color filter 10G is arranged on the lower half of the pixel 11b and the pixel 11c. Further, a color filter 10B is disposed on the pixel 11d. A common electrode 22 is formed on the

color filters

10R, 10G, and 10B. The common electrode 22 is formed of a transparent conductive film such as ITO and is formed in a planar shape. A planarizing film may be provided between the

color filters

10R, 10G, and 10B and the common electrode 22. An alignment film is provided at the interface between the color filter substrate 2 and the liquid crystal layer 3. The surface of the alignment film is rubbed and defines the alignment direction of the nearby liquid crystal molecules. Further, columnar spacers 55 are formed on the color filter substrate 2 so as to extend toward the opposing TFT substrate 1.

As shown in FIG. 54, the TFT substrate 1 and the color filter substrate 2 sandwich the liquid crystal layer 3. In the liquid crystal display device having the TN structure, the liquid crystal layer 3 contains nematic liquid crystal molecules having positive dielectric anisotropy. As shown in FIGS. 6 and 54, a red pixel 11a, a green pixel 11c, and a blue pixel 11d are formed by bonding two substrates together. Further, a yellow pixel 11b having the color filter 10R and the color filter 10G is formed. The yellow pixel 11b has a vertically symmetrical structure. As shown in FIG. 6, when viewed in a plan view, in the pixel 11b, the boundary between the color filter 10R and the color filter 10G overlaps with the auxiliary capacitance bus line 33 provided on the TFT substrate. The boundary portion is shielded from light by the auxiliary capacitance bus line 33. Therefore, the black matrix does not have to be formed at this boundary portion. In the pixel 11b, the color filter 10R and the color filter 10G may not be overlapped. In this manner, a TN mode liquid crystal display device having R, G, B, and Y pixels can be obtained by using R, G, and B color filters.

Embodiment 3
As a display device according to Embodiment 3, a liquid crystal display device having a CPA structure is shown below. FIG. 7 is a schematic plan view of a TFT substrate of the liquid crystal display device according to the third embodiment. FIG. 8 is a schematic plan view of the color filter substrate of the liquid crystal display device according to the third embodiment. FIG. 9 is a schematic plan view after the TFT substrate and the color filter substrate are bonded to each other in the liquid crystal display device according to the third embodiment. 55 is a schematic cross-sectional view taken along the line EF of FIG. In FIG. 55, illustration of each configuration of the TFT substrate is omitted.

As shown in FIG. 7, on the TFT substrate 1, a first electrode portion 41 formed in accordance with approximately the upper half of the pixel, and a second electrode portion 42 formed in alignment with approximately the lower half of the pixel. And are formed. The first electrode portion 41 and the second electrode portion 42 are connected to each other at the center of the pixel, and constitute a pixel electrode 40. The pixel electrode 40 is electrically connected to the drain electrode of the TFT 30 through a contact hole 34 formed in the insulating layer at the center of the pixel. Further, the drain electrode is formed in a rectangular shape at the center of the pixel. The storage capacitor bus line 33 extends linearly in parallel with the gate bus line 31 so as to pass through the center of the pixel, and overlaps with a portion of the drain electrode formed in a rectangular shape. Other configurations of the TFT substrate are the same as those of the second embodiment.

As shown in FIGS. 8, 9, and 55, in the liquid crystal display device according to the third embodiment, resin protrusions 50 are provided on the color filter substrate 2. The resin protrusion 50 is provided at a position facing the central portion of each of the first electrode portion 41 and the second electrode portion 42. The resin protrusion 50 is a structure for controlling the alignment of the liquid crystal radially with the center of the resin protrusion 50. Examples of the structure include a hole formed in the common electrode 22 in addition to the resin protrusion 50. Other configurations of the color filter substrate 2 are almost the same as those of the second embodiment. However, in the present embodiment, the black matrix 20 is not formed at a position facing the gate bus line 31 of the TFT substrate 1.

As shown in FIG. 55, the TFT substrate 1 and the color filter substrate 2 sandwich the liquid crystal layer 3 in the vertical alignment mode. In the liquid crystal display device having a CPA structure, the liquid crystal layer 3 contains nematic liquid crystal molecules having negative dielectric anisotropy. As shown in FIG. 9, in the same manner as in the second embodiment, in addition to the

primary color pixels

11a, 11c, and 11d of R, G, and B, a Y pixel 11b can be formed. The yellow pixel 11b has a vertically symmetrical structure. Further, when viewed in plan, in the pixel 11b, the boundary between the color filter 10R and the color filter 10G overlaps with the storage capacitor bus line 33 provided on the TFT substrate 1. The boundary portion is shielded from light by the auxiliary capacitance bus line 33. Therefore, the black matrix 20 does not have to be formed at this boundary portion. In this manner, a liquid crystal display device having a CPA structure having R, G, B, and Y pixels can be obtained by using R, G, and B color filters.

Embodiment 4
As a display device according to Embodiment 4, a liquid crystal display device having a TN structure is shown below. Since the configuration of the TFT substrate according to the liquid crystal display device of the fourth embodiment is the same as that of the second embodiment, description thereof is omitted here.

FIG. 10 is a schematic plan view of the color filter substrate of the liquid crystal display device according to the fourth embodiment. As shown in FIG. 10, a color filter 10R is arranged in the upper half of the pixel 11a and the pixel 11b, and a color filter 10G is arranged in the lower half of the pixel 11b and the pixel 11d, respectively. Further, a color filter 10B is disposed on the pixel 11c. That is, in the second embodiment, the pixels are formed in the order of RYGB, but in the fourth embodiment, the pixels are formed in the order of RYBG. In the second embodiment, the Y pixel 11b and the G pixel 11c are adjacent to each other, and the color filter 10G included in the pixel 11b and the color filter 10G included in the pixel 11c are connected, but in the fourth embodiment, The Y pixel 11b and the G pixel 11d are not adjacent to each other, and the color filter 10G included in the pixel 11b and the color filter 10G included in the pixel 11d are not connected. Thus, in the present embodiment, there is a floating island (island) color filter (for example, the color filter 10G included in the pixel 11b). In the fourth embodiment, the color filter 10G included in the pixel 11b corresponds to the fourth color filter. On the other hand, the color filter 10G included in the pixel 11d is formed in a stripe shape rather than a floating island shape. Other configurations of the color filter substrate are the same as those of the second embodiment.

FIG. 11 is a schematic plan view after the TFT substrate and the color filter substrate are bonded together in the liquid crystal display device according to the fourth embodiment. The TFT substrate and the color filter substrate sandwich the liquid crystal layer. As shown in FIG. 11, in addition to R, B, and G

primary color pixels

11a, 11c, and 11d, a Y pixel 11b can be formed. That is, the second embodiment is a liquid crystal display device in which pixels are arranged in the order of RYGB. However, in the fourth embodiment, a liquid crystal display device in which pixels are arranged in the order of RYBG can be obtained in the same manner. Can be increased. Similarly, a display device in which pixels are arranged in the order of RGBY or RGYB can be obtained. Furthermore, also in this embodiment, the yellow pixel 11b has a vertically symmetrical structure. In the present embodiment, the G pixel 11d corresponds to the specific pixel.

Embodiment 5
As a display device according to Embodiment 5, a liquid crystal display device having a CPA structure is described below. FIG. 12 is a schematic plan view of the TFT substrate of the liquid crystal display device according to the fifth embodiment.

In the third embodiment, the first electrode portion 41 and the second electrode portion 42 are formed to have the same area, and the storage capacitor bus line 33 passes through the center portion of the pixel so as to pass through the gate bus line. It was stretched linearly in parallel with 31. On the other hand, in the fifth embodiment, the position divided by the first electrode portion 41 and the second electrode portion 42 is not the center of the pixel. For example, as shown in FIG. The area is set larger than the area of the second electrode portion 42. Specifically, compared with the third embodiment, the first electrode portion 41 is formed to be longer by 15 μm. Accordingly, the storage capacitor bus line 33 extends linearly in parallel with the gate bus line 31 so as to pass below the center of the pixel. Other configurations of the TFT substrate are the same as those of the third embodiment.

FIG. 13 is a schematic plan view of the color filter substrate of the liquid crystal display device according to the fifth embodiment. As shown in FIG. 13, the color filter 10R is disposed at a position facing the first electrode portion 41 in the pixel 11b, and the color filter 10G is disposed at a position facing the second electrode portion 42. That is, in the pixel 11b, the area of the color filter 10R is larger than the area of the color filter 10G. Other configurations of the color filter substrate are the same as those of the third embodiment.

FIG. 14 is a schematic plan view after the TFT substrate and the color filter substrate are bonded together in the liquid crystal display device according to the fifth embodiment. As in the third embodiment, the TFT substrate and the color filter substrate sandwich a liquid crystal layer in a vertical alignment mode. As shown in FIG. 14, in addition to the

primary color pixels

11a, 11c and 11d of R, G and B, a Y pixel 11b can be formed. In the Y pixel, the area of the color filter 10R is formed to be larger than the area of the color filter 10G. In this way, in the Y pixel 11b, it is possible to change the transmission efficiency and chromaticity by adjusting the amounts of red light and green light.

The effects of the first to fifth embodiments are summarized as follows.

Since the fourth color pixel (fourth pixel) is provided for chromaticity adjustment, the color filter for which chromaticity adjustment is performed does not become extremely small.

In the fourth color pixel, a plurality of color filters of different colors are arranged so as to be aligned with each other when viewed in plan, rather than being overlaid and mixed. Therefore, in the fourth color pixel, light passing through each color filter can be mixed to adjust the chromaticity, and in the fourth color pixel, the step caused by the color filter can be reduced.

Since it is not necessary to prepare a new color filter for the pixel of the fourth color, the mask cost for the color filter of the fourth color is unnecessary.

Since the four color pixels are formed by the three color filters, the manufacturing process does not become long. On the other hand, when a fourth color filter is prepared for chromaticity adjustment, the manufacturing process becomes long.

Compared to the three-color pixel, the picture element configuration in which the four-color pixel is the minimum repeating unit enables high-definition display. For example, rattling when a diagonal white line other than 45 ° is displayed on a black screen is alleviated.

Further, in the form of FIG. 2 shown in Embodiment 1, since the rectangular portion of the color filter is wide (the right-angle portion is small), the flatness of the color filter and the overlapping accuracy of the color filter can be further improved. Display quality is better. When the flatness is good, the liquid crystal alignment is improved, and as a result, the response and the afterimage are strong. Further, when the overlapping accuracy is good, no gap is generated between the color filters, and as a result, the contrast is improved.

In the fourth embodiment, the number of possible pixel arrangement patterns can be increased. When there is no floating island-like color filter, only RYGB arrangement is possible, but when there is a floating island-like color filter, RGBY and RGYB arrangement is possible.

In the fifth embodiment, since the position divided by the first electrode portion 41 and the second electrode portion 42 is not the center of the pixel, the range of chromaticity adjustment can be made wider.

Embodiment 6
The display device of Embodiment 6 will be described in detail below.

FIG. 15 is a schematic plan view of a display device according to the sixth embodiment. In the sixth embodiment, similarly to the first embodiment, the color filter 10R and the color filter 10G are arranged on the pixel 11b, and the pixel 11b is a Y pixel. In the first embodiment, the color filter 10R is arranged in the upper half area of the pixel 11b and the color filter 10G is arranged in the lower half area. However, in the sixth embodiment, as shown in FIG. Is divided into four in the long side direction, the color filter 10R is arranged in the uppermost region and the lowermost region, and the color filter 10G is arranged in the remaining region. In other words, the color filter is symmetrically arranged with respect to a line (dotted line in FIG. 15) parallel to the short side of the pixel passing through the center of the pixel. Thereby, the viewing angle characteristics of the display device can be improved. On the other hand, in the display device according to the first embodiment, particularly in a multi-domain and wide viewing angle display device, since the color filters are not symmetrically arranged, coloring when observed from an oblique direction may vary depending on the direction. There is. Other configurations in the sixth embodiment are the same as those in the first embodiment. In FIG. 15, the

color filters

10R, 10G, and 10B are described so as to be arranged side by side without overlapping each other on the same plane, but each color filter overlaps at the end. Also good. In FIG. 15, the portion in the pixel 11a and the portion in the pixel 11b of the color filter 10R are described as being connected to each other, but both portions may be disposed separately. Similarly, the part in the pixel 11c and the part in the pixel 11b of the color filter 10G are described as being connected to each other, but both parts may be arranged separately.

Embodiment 7
As a display device according to Embodiment 7, a liquid crystal display device in a vertical alignment mode (hereinafter also referred to as ASV-FH) including a multi-domain using a fishbone (fishbone type) electrode structure is shown below. FIG. 16 is a schematic plan view of a TFT substrate of the liquid crystal display device according to the seventh embodiment. FIG. 17 is a schematic plan view of the color filter substrate of the liquid crystal display device according to the seventh embodiment. FIG. 18 is a schematic plan view after the TFT substrate and the color filter substrate are bonded together in the liquid crystal display device according to the seventh embodiment. 56 is a schematic cross-sectional view taken along the line GH of FIG. In FIG. 56, illustration of each configuration of the TFT substrate is omitted.

As shown in FIG. 16, the pixel electrode 40 is formed on the TFT substrate 1. The pixel electrode 40 has a fishbone structure including a trunk and a plurality of branches branched from the trunk. The branch part extends in four directions and constitutes four domains D1 to D4. The pixel electrode 40 is electrically connected to the drain electrode of the TFT 30 through a contact hole 34 formed in the insulating layer at the center of the pixel. The drain electrode extends in the long side direction of the pixel and is formed in a rectangular shape in the center of the pixel (extends in the short side direction of the pixel). The storage capacitor bus line 33 extends linearly in parallel with the gate bus line 31 so as to pass through the center of the pixel, and overlaps with a portion of the drain electrode formed in a rectangular shape. Other configurations of the TFT substrate 1 are almost the same as those of the second embodiment.

As shown in FIGS. 17 and 18, when the pixel 11b is divided into four in the long side direction, the color filter 10R is arranged in the uppermost region and the lowermost region, and the color filter 10G is provided in the remaining region. Arranged. The color filter 10R arranged in the uppermost area of the pixel 11b and the color filter 10R arranged in the lowermost area of another pixel 11b provided on the pixel 11b are connected to each other. . In the pixel 11b, a BM portion 60 that is a part of the BM 20 is provided between the color filter 10R and the color filter 10G (region (I) in FIG. 17). A portion where the color filter 10R and the color filter 10G are adjacent to each other is shielded by the BM portion 60. Other configurations of the color filter substrate 2 are almost the same as those of the second embodiment. However, in the present embodiment, the black matrix 20 is not formed at a position facing the gate bus line 31 of the TFT substrate 1.

As shown in FIG. 56, the TFT substrate 1 and the color filter substrate 2 sandwich the liquid crystal layer 3 in the vertical alignment mode. In the ASV-FH mode liquid crystal display device, the liquid crystal layer 3 contains nematic liquid crystal molecules having negative dielectric anisotropy. The liquid crystal display device of this embodiment uses the PSA technique, and the TFT substrate 1 and the color filter substrate 2 each include a polymer film that stores the direction in which the liquid crystal molecules are tilted. The polymer films are formed on the alignment films of the TFT substrate 1 and the color filter substrate 2, respectively. As shown in FIG. 18, in the same manner as in the second embodiment, in addition to the

primary color pixels

11a, 11c, and 11d of R, G, and B, a Y pixel 11b can be formed. Thereby, in all the pixels, the color filter is symmetrically arranged with respect to a line parallel to the short side of the pixel passing through the center of the pixel. Thereby, the viewing angle characteristics of the multi-domain display device can be particularly improved.

Embodiment 8
As a display device according to the eighth embodiment, a TN mode liquid crystal display device is described below. FIG. 19 is a schematic plan view of a TFT substrate of the liquid crystal display device according to the eighth embodiment.

In the second embodiment, the storage capacitor bus line 33 extends linearly in parallel with the gate bus line 31 so as to pass through the center of the pixel. On the other hand, in the eighth embodiment, the storage capacitor bus line 33 passes between the line parallel to the short side of the pixel passing through the center of the pixel and the gate bus line 31 constituting the short side above the pixel. Stretched. Other configurations of the TFT substrate are the same as those of the second embodiment.

FIG. 20 is a schematic plan view of the color filter substrate of the liquid crystal display device according to the eighth embodiment. As shown in FIG. 20, when the pixel 11b is divided into four in the short side direction, the color filter 10G is disposed in the uppermost region and the lowermost region, and the color filter 10R is disposed in the remaining region. . The color filter 10G disposed in the uppermost area of the pixel 11b and the color filter 10G disposed in the lowermost area of another pixel 11b provided on the pixel 11b are connected to each other. . In the region (I) of FIG. 20, a BM portion 60 is provided between the color filter 10R and the color filter 10G. On the other hand, in the region (II) of FIG. 20, the BM portion 60 is not provided between the color filter 10R and the color filter 10G. Other configurations of the color filter substrate are the same as those of the second embodiment.

FIG. 21 is a schematic plan view after the TFT substrate and the color filter substrate are bonded together in the liquid crystal display device according to the eighth embodiment. The TFT substrate and the color filter substrate sandwich the liquid crystal layer. As shown in FIG. 21, similarly to the seventh embodiment, in addition to the

primary color pixels

11 a, 11 c, and 11 d of R, G, and B, a Y pixel 11 b can be formed. In all the pixels, the color filter is symmetrically arranged with respect to a line parallel to the short side of the pixel passing through the center of the pixel. Thereby, the viewing angle characteristics of the display device can be improved. In the region (II) of FIG. 20, since the space between the color filter 10R and the color filter 10G overlaps with the storage capacitor bus line 33, it is necessary to provide the BM portion 60 between the color filter 10R and the color filter 10G. There is no.

Embodiment 9
As a display device according to the ninth embodiment, an ASV-FH liquid crystal display device is described below. FIG. 22 is a schematic plan view of a TFT substrate of the liquid crystal display device according to the ninth embodiment. FIG. 23 is a schematic plan view of the color filter substrate of the liquid crystal display device according to the ninth embodiment. FIG. 24 is a schematic plan view after the TFT substrate and the color filter substrate are bonded together in the liquid crystal display device according to the ninth embodiment. FIG. 57 is a schematic sectional view taken along line JK of FIG. In FIG. 57, illustration of each configuration of the TFT substrate is omitted.

As shown in FIG. 22, the first pixel electrode 43 and the second pixel electrode 44 are formed on the TFT substrate 1. The first pixel electrode 43 and the second pixel electrode 44 constitute a pixel electrode 40. Each of the first pixel electrode 43 and the second pixel electrode 44 has a fishbone structure including a trunk portion and a plurality of branch portions branched from the trunk portion. The trunk portion divides the pixel area into four, and a plurality of branch portions branched from the trunk portion each extend in a 45 ° direction. As a result, four domains D1 to D4 are configured. The first pixel electrode 43 is electrically connected to the drain electrode of the TFT 30 through a contact hole 34 formed in the insulating layer. The drain electrode extends in the long side direction of the pixel and is formed in a rectangular shape (extends in the short side direction of the pixel) at a position facing the center of the first pixel electrode 43. Further, the drain electrode is formed in a rectangular shape at a position facing the center of the second pixel electrode 44 (extends also in the short side direction of the pixel). The drain electrode extended in the long side direction and the short side direction of the pixel at a position facing the second pixel electrode 44 forms a coupling capacitor portion 65. In other words, a capacitor is formed by the trunk portion of the second pixel electrode 44, the drain electrode portion facing the trunk portion, and the insulating layer portion sandwiched between these portions. The second pixel electrode 44 is coupled to the first pixel electrode 43 through the capacitance of the coupling capacitor unit 65. In other words, the second pixel electrode 44 is connected to one terminal of the capacitor, and the first pixel electrode 43 is connected to the other terminal of the capacitor. Therefore, the liquid crystal display device of this embodiment has a capacitively coupled multi-pixel structure. The region where the first pixel electrode 43 is provided functions as a main pixel, and the region where the second pixel electrode 44 is provided functions as a subpixel. The sub-pixel is not directly connected to the TFT 30, but is a pixel that indirectly receives the influence of the potential change of the main pixel through the coupling capacitance. Other configurations of the TFT substrate 1 are the same as those of the seventh embodiment.

As shown in FIG. 23, in the pixel 11b, when the region facing the first pixel electrode 43 is divided into four in the long side direction, the color filter 10R is arranged in the uppermost region and the lowermost region. The color filter 10G is disposed in the remaining area. In the pixel 11b, when the region facing the second pixel electrode 44 is divided into four in the long side direction, the color filter 10R is arranged in the uppermost region and the lowermost region, and the remaining region is A color filter 10G is arranged. The color filter 10R arranged in the uppermost area of the pixel 11b and the color filter 10R arranged in the lowermost area of another pixel 11b provided on the pixel 11b are connected to each other. . In the pixel 11b, a BM portion 60 is provided between the color filter 10R and the color filter 10G (region (I) in FIG. 23). Other configurations of the color filter substrate 2 are the same as those of the seventh embodiment.

As shown in FIG. 57, the TFT substrate 1 and the color filter substrate 2 sandwich the liquid crystal layer 3 in the vertical alignment mode. As shown in FIG. 24, similarly to the seventh embodiment, in addition to the

primary color pixels

11a, 11c, and 11d of R, G, and B, a Y pixel 11b can be formed. The color filter 10R disposed in the pixel 11b includes a part of the first pixel electrode 43 on the second pixel electrode 44 side and a part of the second pixel electrode 44 on the first pixel electrode 43 side. Covering. Therefore, viewing angle characteristics can be improved. Further, in a region (main pixel) including the first pixel electrode 43 of the pixel 11b, a color filter is symmetrically arranged with respect to a line parallel to the short side of the pixel passing through the center of the first pixel electrode 43. The Similarly, also in the region (subpixel) including the second pixel electrode 44 of the pixel 11b, the color filter is symmetrical with respect to a line parallel to the short side of the pixel passing through the center of the second pixel electrode 44. Arranged. As a result, the viewing angle characteristics of a multi-domain and multi-pixel display device can be particularly improved.

As described above, in Embodiments 6 to 9, the arrangement of the color filter is symmetric with respect to the center of the pixel, so that the viewing angle characteristics are not deteriorated.

On the other hand, in the first to fifth embodiments, the viewing angle characteristics may deteriorate. In particular, when an asymmetric color filter is applied to a multi-domain wide viewing angle display device, coloring when observed from an oblique direction may differ depending on the observation direction.

Embodiment 10
The display device of Embodiment 10 will be described in detail below.

25 to 28 are schematic plan views of the display device according to the tenth embodiment. In the tenth embodiment, the pixel 11b functions as a white (W) pixel by mixing red light that has passed through the color filter 10R, green light that has passed through the color filter 10G, and blue light that has passed through the color filter 10B. To do. The

pixels

11a, 11b, 11c, and 11d constitute a picture element 12. That is, the

pixels

110a, 110b, 110c, and 110d each having four

color filters

100R, 100G, 100B, and 100W of R, G, B, and W as shown in FIG. This is the same as the display device including the element 120. Specifically, as shown in FIG. 25, when the pixel 11b is divided into six in the long side direction, the color filter 10R is arranged in the uppermost region and the lowermost region, and the second region from the top. The color filter 10G is disposed in the second region from the bottom, and the color filter 10B is disposed in the remaining region. In other words, the color filter is symmetrically arranged with respect to a line parallel to the short side of the pixel passing through the center of the pixel (a chain line in FIG. 25). Thereby, the viewing angle characteristics of the display device can be improved. Further, as shown in FIG. 26, when the pixel 11b is divided into six in the long side direction, the color filter 10B is arranged in the uppermost region and the lowermost region, and the second region from the top and the bottom region The color filter 10G may be disposed in the second area, and the color filter 10R may be disposed in the remaining area. At this time, as in FIG. 25, the color filter is symmetrically arranged with respect to a line parallel to the short side of the pixel passing through the center of the pixel (a chain line in FIG. 26). As shown in FIGS. 27 and 28, when the pixel 11b is divided into three in the long side direction, the color filter 10R, the color filter 10G, and the color filter 10B may be arranged in this order, or the color filter 10R, the color filter 10B, The filter 10B and the color filter 10G may be arranged in this order. Other configurations in the tenth embodiment are the same as those in the first embodiment. In the present embodiment, the B pixel 11d corresponds to the specific pixel. 25 to 28, the

color filters

10R, 10G, and 10B are not overlapped at the ends in the pixel 11b, but the color filters may overlap at the ends. . In FIG. 25 to FIG. 28, the portion in the pixel 11a and the portion in the pixel 11b of the color filter 10R are shown connected to each other, but both portions may be arranged separately. Similarly, the part in the pixel 11c and the part in the pixel 11b of the color filter 10G are described as being connected to each other, but both parts may be arranged separately.

Embodiment 11
As a display device according to the eleventh embodiment, an ASV-FH liquid crystal display device is described below. FIG. 30 is a schematic plan view of the TFT substrate of the liquid crystal display device according to the eleventh embodiment.

The configuration of the TFT substrate is the same as that of the seventh embodiment as shown in FIG.

FIG. 31 is a schematic plan view of the color filter substrate of the liquid crystal display device according to the eleventh embodiment. As shown in FIG. 31, when the pixel 11b is divided into six in the long side direction, the color filter 10R is arranged in the top region and the bottom region, the second region from the top and the second region from the bottom. The color filter 10G is arranged in the area, and the color filter 10B is arranged in the remaining area. The color filter 10R arranged in the uppermost area of the pixel 11b and the color filter 10R arranged in the lowermost area of another pixel 11b provided on the pixel 11b are connected to each other. . In the pixel 11b, BM portions 60 are provided between the color filter 10R and the color filter 10G and between the color filter 10G and the color filter 10B, respectively. Other configurations of the color filter substrate are the same as those of the seventh embodiment.

FIG. 32 is a schematic plan view after the TFT substrate and the color filter substrate are bonded to each other in the liquid crystal display device according to the eleventh embodiment. The TFT substrate and the color filter substrate sandwich a liquid crystal layer in a vertical alignment mode. As shown in FIG. 32, in the same manner as in the tenth embodiment, in addition to the

primary color pixels

11a, 11c, and 11d of R, G, and B, a W pixel 11b can be formed. In all pixels, the color filter is symmetrically arranged with respect to a line parallel to the short side of the pixel passing through the center of the pixel. Thereby, the viewing angle characteristics of the multi-domain display device can be particularly improved. In the present embodiment, the B pixel 11d corresponds to the specific pixel.

Embodiment 12
As a display device according to Embodiment 12, a TN mode liquid crystal display device is described below. FIG. 33 is a schematic plan view of the TFT substrate of the liquid crystal display device according to the twelfth embodiment.

In the second embodiment, the storage capacitor bus line 33 extends linearly in parallel with the gate bus line 31 so as to pass through the center of the pixel. On the other hand, in the twelfth embodiment, the storage capacitor bus line 33 is extended so as to divide the pixel into three and overlap one of two straight lines parallel to the short side of the pixel. Other configurations of the TFT substrate are the same as those of the second embodiment.

FIG. 34 is a schematic plan view of the color filter substrate of the liquid crystal display device according to the twelfth embodiment. As shown in FIG. 34, when the pixel 11b is divided into three in the long side direction, the color filter 10R, the color filter 10G, and the color filter 10B are arranged in this order. Further, in each of the different pixels 11b arranged above and below the pixel 11b, the color filter 10B, the color filter 10G, and the color filter 10R are arranged in this order. The color filter 10G disposed in the uppermost region of the pixel 11b and the color filter 10G disposed in the lowermost region of another pixel 11b provided on the pixel 11b are connected to each other. . Similarly, the color filter 10B arranged in the lowermost area of the pixel 11b and the color filter 10B arranged in the uppermost area of another pixel 11b provided below the pixel 11b are connected to each other. Yes. In the pixel 11b, in the region (I) of FIG. 34, a BM portion 60 is provided between the color filter 10B and the color filter 10G. On the other hand, in the region (II), the BM portion 60 is not provided between the color filter 10G and the color filter 10B.

FIG. 35 is a schematic plan view after the TFT substrate and the color filter substrate are bonded together in the liquid crystal display device according to the twelfth embodiment. The TFT substrate and the color filter substrate sandwich the liquid crystal layer. As shown in FIG. 35, similarly to Embodiment 11, in addition to R, G, and B

primary color pixels

11a, 11c, and 11d, a W pixel 11b can be formed. In addition, a color filter is symmetrically arranged between the two pixels 11b with respect to the gate bus line 31 (the one-dot chain line in FIG. 35) that separates the two pixels 11b. That is, the color arrangement of the color filter is symmetric in units of two pixels. Thereby, the viewing angle characteristics of the display device can be improved. In the present embodiment, the B pixel 11d corresponds to the specific pixel.

As described above, in the eleventh and twelfth embodiments, since the arrangement of the color filters is symmetric with respect to the center of the pixel or the center of two adjacent pixels, the viewing angle characteristics are not deteriorated. That is, the color filters are arranged symmetrically in units of one pixel or two pixels.

On the other hand, in the first to fifth embodiments, the viewing angle characteristics may deteriorate as described above. Moreover, coloring when observed from an oblique direction may differ depending on the observation direction.

Embodiment 13
The display device of Embodiment 13 will be described in detail below.

In the thirteenth embodiment, the color filter arranged in one pixel extends in the short side direction of the pixel outside the pixel region. A portion extending outside the pixel region of the color filter is also referred to as a horizontal cross section below. 36 to 42 are schematic plan views of the display device according to the thirteenth embodiment. As shown in FIG. 36, when the color filter 10G is arranged on the pixel 11b, even if the pixel 11d on which the color filter 10G is arranged is not adjacent to the pixel 11b, the pixel 11b is arranged on the pixel 11b. The color filter 10G and the color filter 10G arranged in the pixel 11d can be connected to each other. That is, the G pixel 11d corresponds to the specific pixel, and the crosspiece 13 corresponds to the connection portion. As described above, the color filter 10G arranged in the pixel 11d is connected to the color filter 10G arranged in the pixel 11b outside the area of the pixel 11b and the pixel 11d. Thereby, it can prevent that the deterioration of pattern accuracy concentrates on a specific color. As shown in FIGS. 37 and 38, when three color filters are arranged on the pixel 11b, the horizontal cross section 13 connects the color filters of the same color between the pixels of different colors.

In the thirteenth embodiment, when the color filter 10G arranged in the pixel 11b is sandwiched between other color filters, the color filter other than the color filter 10G (red or blue) has a horizontal cross section. In particular, as shown in FIG. 39 and FIG. 40, it is more preferable that the color filter of the color (blue) having a lower color transmittance among red and blue has the crosspiece 13. 39 and 40, when the color filter 10G has a horizontal cross section, the color filter 10G disposed in the picture element 11b, the color filter 10G disposed in the picture element 11c, and the horizontal cross section. Thus, the color filter 10G has a concave shape including many right-angle portions. The right-angled part has a poor color filter finish and is rounded. In a portion where the color filters are formed in a round shape, it is necessary to widen a region where the color filters of different colors overlap with each other. Therefore, the total film thickness of the color filter increases in the region, and the alignment of the liquid crystal is disturbed. Conversely, if the area where the color filters of different colors overlap is reduced considering that the right-angled parts of the color filters are rounded, if the reading is lost, these color filters will not overlap each other and the backlight Light leakage occurs. As described above, it is difficult to predict the finish of the right-angled portion, and the color filter may not be finished in the shape as designed. Further, in the thirteenth embodiment, when the pixel 11b includes the floating island-shaped color filter 10B, it is preferable that a color filter of a color (red or green) other than the color filter 10B has a horizontal cross section, and particularly, as shown in FIG. As described above, it is more preferable that the color filter having a lower color transmittance (red) among red and green has the crosspiece 13. As shown in FIG. 42, when the color filter 10B has the horizontal rail portion 13, the color filter of the same color as shown by the double arrow in FIG. 42 is spaced between the floating island-shaped color filter 10B and the horizontal rail portion 13. A narrow region (hereinafter, also referred to as “extraction”) occurs. If the punching is narrow, the floating island portion and the horizontal rail portion 13 are difficult to be formed as designed, and the right-angled portion of the floating island portion is formed round, so that the punching is further narrowed near the center of the punching. As a result, the removal becomes narrower than the design value, and in some cases, the crosspiece 13 is connected to the floating island, and the removal itself may not be formed. In this way, a color filter is formed (or remaining) at an unintended location, and chromaticity adjustment may not be possible in the pixel 11b. Other configurations in the thirteenth embodiment are the same as those in the first embodiment. In FIG. 40 to FIG. 42, the B pixel 11d corresponds to the specific pixel. 36 to 42, the

color filters

10R, 10G, and 10B are described so as to be arranged side by side without overlapping each other on the same plane, but each color filter overlaps at the end. It may be met. In FIG. 36 to FIG. 42, the color filter portions of the same color arranged in the adjacent pixels are described as being connected to each other. However, these portions may be arranged separately.

Embodiment 14
As a display device according to the fourteenth embodiment, a liquid crystal display device having a TN structure is shown below. Since the configuration of the TFT substrate according to the liquid crystal display device of the fourteenth embodiment is the same as that of the fourth embodiment, the description thereof is omitted here.

FIG. 43 is a schematic plan view of the color filter substrate of the liquid crystal display device according to the fourteenth embodiment. As shown in FIG. 43, a color filter 10R is arranged in the upper half of the pixel 11a and the pixel 11b, and a color filter 10G is arranged in each of the lower half of the pixel 11b and the pixel 11d. Further, a color filter 10B is disposed on the pixel 11c. That is, in Embodiment 14, pixels are formed in the order of RYBG. As described above, in the present embodiment, the G pixel 11d corresponds to the specific pixel, and there is a color filter (a color filter 10G included in the pixel 11b) that can have a floating island shape (island shape). In the fourth embodiment, the Y pixel 11b and the G pixel 11d are not adjacent to each other, and the color filter 10G included in the pixel 11b and the color filter 10G included in the pixel 11c are not connected to each other. On the other hand, in the fourteenth embodiment, the color filter 10G disposed in the pixel 11b and the pixel 11d are disposed by the horizontal cross section 13 of the color filter 10G formed by extending in the short side direction of the pixel outside the pixel region. The color filters 10G are connected to each other. Other configurations of the color filter substrate are the same as those of the second embodiment.

FIG. 44 is a schematic plan view of the liquid crystal display device according to the fourteenth embodiment after the TFT substrate and the color filter substrate are bonded together. The TFT substrate and the color filter substrate sandwich the liquid crystal layer. As in the fourth embodiment, as shown in FIG. 44, in addition to R, B, and G

primary color pixels

11a, 11c, and 11d, a Y pixel 11b can be formed. That is, a liquid crystal display device in which pixels are arranged in the order of RYBG can be obtained. Further, in the present embodiment, the color filters of different colors are not overlapped except at the end portions. However, when the color filter pattern accuracy is poor, a gap is generated between the color filters, light leakage occurs, and the contrast is increased. May decrease. However, the horizontal crosspiece 13 can prevent the deterioration of the pattern accuracy from concentrating on the specific color, so that the reduction in contrast can be suppressed.

Further, by connecting the color filter that can be floating island shape to the horizontal rail portion, the floating island color filter is reduced. In the floating island-shaped color filter, the corner of the pattern is formed in a round shape, so that the finishing accuracy is worse than that of the stripe-shaped pattern. This is remarkable when the area of the floating island-shaped color filter is small. On the other hand, according to the present embodiment, it is possible to prevent the deterioration of pattern accuracy from concentrating on a specific color.

Note that the present embodiment is not limited to the Y pixel, and can also be applied to a form having the W pixel. In this case, it is difficult to prevent the generation of floating island-shaped color filters in all color filters, that is, it is difficult to prevent the generation of floating island-shaped color filters, but the number of floating island-shaped color filters is reduced. It is possible to do.

Embodiment 15
As a display device according to the fifteenth embodiment, a liquid crystal display device having a TN structure is shown below. Since the configuration of the TFT substrate according to the liquid crystal display device of the fifteenth embodiment is the same as that of the fourteenth embodiment, description thereof is omitted here.

45 and 58 are schematic plan views of the color filter substrate of the liquid crystal display device according to the fifteenth embodiment. FIG. 46 is a schematic plan view of the liquid crystal display device according to the fifteenth embodiment after the TFT substrate and the color filter substrate are bonded together. 59 is a schematic sectional view taken along line MN in FIG. The configuration of the color filter substrate according to the liquid crystal display device of Embodiment 15 is the same as that of the color filter substrate according to Embodiment 14 except for the following points.

In the liquid crystal display device according to the fourteenth embodiment, columnar spacers 55 formed so as to extend toward the opposing TFT substrate are formed on the color filter substrate. On the other hand, in the fifteenth embodiment, as shown in FIGS. 45, 58 and 59, the color filter 10B is disposed on the region of the BM 20 facing the TFT 30, and the color filter 10G disposed on the pixel 11b thereon. A color filter 10G (fifth color filter 10g) connected to (fourth color filter) is formed. Further, a color filter 10R (sixth color filter 10r) is formed on the color filter 10G (fifth color filter 10g) in a region facing the TFT 30. In this manner, the

color filters

10B, 10G, and 10R are stacked in this order on the BM 20, and the stacked column 51 is formed. In addition, the sixth color filter 10r has a color different from that of the color filters arranged therearound and is not connected.

The TFT substrate and the color filter substrate sandwich the liquid crystal layer. As shown in FIG. 46, similarly to Embodiment 14, in addition to R, B, and G

primary color pixels

11a, 11c, and 11d, a Y pixel 11b can be formed. That is, a liquid crystal display device in which pixels are arranged in the order of RYBG can be obtained. Since the stacked pillars are formed by overlapping color filters (color layers), a wider base area is required than a single-layer pillar (single-layer pillar). In the present embodiment, a horizontal beam portion 13 that connects the color filter 10G arranged in the pixel 11b and the color filter 10G arranged in the pixel 11d to each other is provided, and the color filter 10G arranged in the pixel 11b and the horizontal beam portion are provided. Since the 13th and 5th color filters 10g serve as a wide base, the 6th color filter 10r is formed with high accuracy. As a result, the height of the stacked pillars 51 is constant between the picture elements, and the cell thickness is stabilized, so that it is possible to suppress the occurrence of luminance unevenness due to the uneven cell thickness. In the present embodiment, the G pixel 11d corresponds to the specific pixel.

Embodiment 16
As a display device according to Embodiment 16, a liquid crystal display device having a TN structure is shown below. FIG. 47 is a schematic plan view showing a TFT substrate according to the liquid crystal display device of Embodiment 16. FIG. 48 is a schematic plan view of the color filter substrate of the liquid crystal display device according to the sixteenth embodiment. FIG. 49 is a schematic plan view of the liquid crystal display device according to the sixteenth embodiment after the TFT substrate and the color filter substrate are bonded together.

In the second embodiment, the

pixels

11a, 11b, 11c, and 11d are all formed in the same area, and all the pixels are arranged at an equal pitch. On the other hand, in the sixteenth embodiment, the pitch of specific pixels is different from the pitch of other pixels. More specifically, as shown in FIGS. 48 and 49, the

pixels

11a, 11b, 11c, and 11d function as R, Y, B, and G pixels, respectively, and the Y pixel 11b and the G pixel 11d. The short sides are formed shorter than the short sides of the R pixel 11a and the B pixel 11c (for example, the short sides of the

pixels

11b and 11d are 65 μm, and the

pixels

11a and 11c have a short side length). The length of the short side is 85 μm). As shown in FIG. 47, other configurations of the TFT substrate are the same as those of the second embodiment.

As shown in FIG. 48,

color filters

10R, 10G, and 10B are formed in accordance with the area of the pixel. Other configurations of the color filter substrate are the same as those of the second embodiment.

The TFT substrate and the color filter substrate sandwich the liquid crystal layer. As shown in FIG. 49, in addition to R, B, and G

primary color pixels

11a, 11c, and 11d, a Y pixel 11b can be formed. Further, the pitch of the R pixel 11a and the B pixel 11c can be made larger than that of the Y pixel 11b and the G pixel 11d. As a product using general multi-primary picture elements (for example, RGBY), a liquid crystal television (for example, a liquid crystal television manufactured by Sharp Corporation) in which the pitch of pixels of a specific color is different from the pitch of pixels of other colors is known. However, in the present embodiment, such a general RGBY television drive circuit can be used to produce a pseudo RGBY compatible display device. That is, chromaticity adjustment can be performed by performing signal control in the same manner as a general RGBY display device. At this time, since the color purity of Y is generally not the same between the general case where the Y color filter is used exclusively and the case where Y is formed by R and G as in the present embodiment, the source signal It is preferable to adjust the voltage for the display device of this embodiment. According to the present embodiment, although the color reproducibility is not as good as that of a display device using four color filters of RGBY, a higher-definition image can be displayed than a display device having normal RGB three-color pixels. Can be obtained without increasing the number of masks. In the present embodiment, the G pixel 11d corresponds to the specific pixel.

In the first to sixteenth embodiments, a TN mode liquid crystal display device, a CPA liquid crystal display device, or an ASV-FH liquid crystal display device is illustrated, but the display devices according to the first to sixteenth embodiments are shown in FIG. Such an MVA liquid crystal display device may be used.

The MVA liquid crystal display device includes a pixel electrode 40 formed on a TFT substrate in a rectangular shape in accordance with the shape of the pixel. A slit 52 (shown by a broken line in FIG. 50) is formed in the pixel electrode 40. Further, ribs 53 (indicated by a one-dot chain line in FIG. 50) are formed on the color filter substrate. Both the slit 52 and the rib 53 are linear structures for controlling the alignment of the liquid crystal. As shown in FIG. 50, when the liquid crystal display device is viewed in plan, a V-shaped rib (hereinafter also referred to as “center rib”) is formed in the vicinity of the center of the pixel, and on the left side of the center rib. A V-shaped slit is formed, and a V-shaped rib smaller than the central rib is formed on the left side of the V-shaped slit. Further, a straight slit is formed on the right side of the central rib, and a straight rib is formed on the right side of the straight slit. When viewed in a plan view, the arrangement of the slits 52 and the ribs 53 in FIG. 50 may be reversed. That is, in FIG. 50, ribs may be provided in regions indicated by broken lines, and slits may be provided in regions indicated by alternate long and short dash lines. Other configurations related to the MVA liquid crystal display device are the same as those of the TN mode liquid crystal display device according to the second embodiment. Even the MVA liquid crystal display device can achieve the same effects as those of the first to sixteenth embodiments.

The above-described embodiments may be combined as appropriate without departing from the scope of the present invention.

This application claims priority based on the Paris Convention or the laws and regulations in the country of transition based on Japanese Patent Application No. 2011-116226 filed on May 24, 2011. The contents of the application are hereby incorporated by reference in their entirety.

1: TFT substrate 2: Color filter substrate 3: Liquid crystal layers 10R, 10r, 10G, 10g, 10B, 100R, 100G, 100B, 100Y, 100W:

Color filters

11a, 11b, 11c, 11d, 110a, 110b, 110c, 110d : Pixel 12, 120: Picture element 13: Horizontal cross section 20: Black matrix (BM)
21: Insulating substrate 22: Common electrode 30: TFT
31: gate bus line 32: data bus line 33: auxiliary capacitance bus line 34: contact hole 40: pixel electrode 41: first electrode portion 42: second electrode portion 43: first pixel electrode 44: second Pixel electrode 50: Resin protrusion 51: Stacked column 52: Slit 53: Rib 55: Columnar spacer 60: BM portion 65: Coupling capacitance portion D1 to D4: Domain

Claims

A substrate,
A first pixel comprising a first color filter;
A second pixel configured to include a second color filter having a color different from that of the first color filter;
A third pixel configured to include a third color filter having a different color from the first and second color filters;
A fourth pixel including two or more color filters,
The first, second and third color filters and the two or more color filters included in the fourth pixel are formed on the substrate;
The first, second, third and fourth pixels are different color pixels,
Each of the two or more color filters included in the fourth pixel has the same color as any of the first, second, and third color filters;
The display device in which the two or more color filters included in the fourth pixel have different colors and are arranged side by side in a plan view.
The display device further includes a substrate having a pixel electrode, and a vertical alignment type liquid crystal layer sandwiched between the two substrates,
The planar shape of the pixel electrode includes a fishbone pattern,
The fourth pixel has two or more domains;
The first, second and third color filters are red, green and blue color filters, respectively.
The first, second and third pixels are red, green and blue pixels, respectively;
The fourth pixel is a yellow pixel,
The two or more color filters included in the fourth pixel include a red color filter and a green color filter,
The display device according to claim 1, wherein the red color filter and the green color filter included in the fourth pixel are arranged symmetrically with respect to an arbitrary line or point.
The display device further includes a substrate having a pixel electrode, and a TN liquid crystal layer sandwiched between the two substrates,
The first, second and third color filters are red, green and blue color filters, respectively.
The first, second and third pixels are red, green and blue pixels, respectively;
The fourth pixel is a yellow pixel,
The two or more color filters included in the fourth pixel include a red color filter and a green color filter,
The display device according to claim 1, wherein the red color filter and the green color filter included in the fourth pixel are arranged symmetrically with respect to an arbitrary line or point.
The display device further includes a substrate having a pixel electrode, and a vertical alignment type liquid crystal layer sandwiched between the two substrates,
The liquid crystal layer includes liquid crystal molecules,
The substrate on which the first, second, and third color filters and the two or more color filters included in the fourth pixel are formed includes two or more substrates each controlling the alignment of the liquid crystal molecules. Including structures,
Each of the two or more structures is formed in a dot shape,
The pixel electrode has two or more electrode portions facing the two or more structures,
The display device according to claim 1, wherein the two or more color filters included in the fourth pixel are provided to face the two or more electrode portions.
The display device further includes a substrate having a first pixel electrode, a second pixel electrode, a capacitor, and a switching element, and a liquid crystal layer sandwiched between the two substrates,
The first pixel electrode is connected to the switching element,
The display device according to claim 1, wherein the second pixel electrode is connected to the first pixel electrode through the capacitor.
The first pixel electrode and the second pixel electrode are arranged side by side in a plan view,
At least one of the two or more color filters included in the fourth pixel includes a part of the first pixel electrode on the second pixel electrode side and the second pixel electrode of the second pixel electrode. The display device according to claim 5, wherein the display device covers a part of one pixel electrode side.
The first, second and third color filters are red, green and blue color filters, respectively.
The first, second and third pixels are red, green and blue pixels, respectively;
The fourth pixel is a white pixel;
The display device according to claim 1, wherein the two or more color filters included in the fourth pixel include a red color filter, a green color filter, and a blue color filter. .
The first, second, third and fourth pixels are arranged in stripes,
The two or more color filters included in the fourth pixel are arranged side by side in a direction orthogonal to the longitudinal direction of the fourth pixel. The display device described in 1.
9. The display device according to claim 1, wherein the two or more color filters included in the fourth pixel are arranged symmetrically with respect to an arbitrary line or point. .
10. The display device according to claim 1, wherein at least one of the first, second, third, and fourth pixels has an area different from that of other pixels.
Any one of the two or more color filters included in the fourth pixel is a fourth color filter;
Among the first, second and third pixels, a pixel including a color filter having the same color as the fourth color filter is a specific pixel.
The display device according to claim 1, wherein the specific pixel is not arranged next to the fourth pixel.
The display device according to claim 11, wherein the color filter included in the specific pixel and having the same color as the fourth color filter is not connected to the fourth color filter.
The color filter included in the specific pixel and having the same color as the fourth color filter is connected to the fourth color filter outside a region of the fourth pixel and the specific pixel. The display device according to claim 11.
The display device further includes a light shielding portion,
The display device according to any one of claims 1 to 13, wherein the light shielding portion shields light from a portion where the two or more color filters included in the fourth pixel are adjacent to each other.
The display device according to any one of claims 1 to 14, wherein, among the two or more color filters included in the fourth pixel, ends of two color filters adjacent to each other overlap each other.