JP4935023B2 - Color filter for liquid crystal display - Google Patents

Description

  The present invention relates to a color filter for a liquid crystal display device, and in particular, in a color filter having a laminated photo spacer, even if the laminated photo spacer is provided in the colored pixels of each color, the difference in height of the laminated photo spacer. The present invention relates to a color filter for a liquid crystal display device.

FIG. 4 is a plan view schematically showing an example of a color filter used in the liquid crystal display device. FIG. 5 is a cross-sectional view taken along the line XX ′ of the color filter shown in FIG.
As shown in FIGS. 4 and 5, the color filter (4) used in the liquid crystal display device has a black matrix (41), a colored pixel (42), and a transparent conductive film (43) on a glass substrate (40). Are formed sequentially.
4 and 5 schematically show a color filter, and 12 colored pixels (42) are represented. In an actual color filter, for example, several hundreds are displayed on a 17-inch diagonal screen. A large number of colored pixels of about μm are arranged.

As a method for manufacturing a color filter having the above structure used in many liquid crystal display devices, a black matrix is first formed on a glass substrate to form a black matrix substrate, and then the black matrix on the black matrix substrate is used. A method is widely used in which a colored pixel is formed by aligning with the pattern, and a transparent conductive film is aligned and formed.
The black matrix (41) is a matrix having light shielding properties, the colored pixels (42) have, for example, red, green, and blue filter functions, and the transparent conductive film (43) is transparent. Provided as a simple electrode.

The black matrix (41) is composed of a matrix portion (41A) between the colored pixels (42) and a frame portion (41B) surrounding the peripheral portion of the region (display portion) where the colored pixels (42) are formed. Yes.
The black matrix determines the position of the colored pixels of the color filter, makes the size uniform, and shields unwanted light when used in a display device, making the image of the display device uniform and uniform. In addition, it has a function of making an image with improved contrast.

For the production of this black matrix substrate, a metal or a metal compound such as chromium (Cr) or chromium oxide (CrO _x ) as a black matrix material is formed into a thin film on a glass substrate (40). An etching resist pattern is formed on the formed thin film using, for example, a positive photoresist, and then an exposed portion of the formed metal thin film is etched and an etching resist pattern is stripped, and Cr, CrO _A method has been adopted in which a black matrix (41) made of a metal thin film such as _X is formed.
Alternatively, the black matrix (41) is formed on the glass substrate (40) by photolithography using a black photosensitive resin for forming a black matrix.

In addition, the colored pixels (42) are formed by providing a coating film on the black matrix substrate using, for example, a negative photoresist in which a pigment or other pigment is dispersed, and exposing and developing the coating film. A method of forming colored pixels is used.
The transparent conductive film (43) is formed on the black matrix substrate on which the colored pixels are formed by, for example, forming a transparent conductive film by sputtering using ITO (Indium Tin Oxide). .

The color filter (4) shown in FIGS. 4 and 5 has a basic function as a color filter used in a liquid crystal display device. The liquid crystal display device incorporates such a color filter to realize full color display, and its application range is dramatically expanded, and many products using liquid crystal display devices such as liquid crystal color TVs and notebook PCs are created. It was done.
With the development and practical use of various liquid crystal display devices, the following various functions have been added to the color filters used in the liquid crystal display devices in addition to the above basic functions.

For example, spacer function. In a conventional liquid crystal display device, transparent spherical particles (beads) of glass or synthetic resin called spacers are dispersed to form a gap between substrates.
Since these spacers are transparent particles, if a spacer is included with the liquid crystal in the pixel, light will leak through the spacer during black display, and the substrate in which the liquid crystal material is enclosed Due to the presence of the spacers between them, the alignment of the liquid crystal molecules in the vicinity of the spacers is disturbed, and light leakage occurs at this part, and the contrast is lowered and the display quality is adversely affected.

As a technique for solving such a problem, a method of forming a photo spacer (protrusion) having a spacer function at a position of a black matrix between pixels by using a photosensitive resin and by a photolithography method has been developed.
FIG. 7 is a partial cross-sectional view of such a color filter for a liquid crystal display device. As shown in FIG. 7, in the color filter (7) for a liquid crystal display device, a black matrix (41), a colored pixel (42), and a transparent conductive film (43) are sequentially formed on a glass substrate (40). A photospacer (44) as a protrusion having a spacer function is formed on the transparent conductive film (43) above the black matrix (41). In the liquid crystal display device using such a color filter (7) for the liquid crystal display device, the photo spacer (44) is formed at a position avoiding the inside of the pixel, and thus the contrast is improved.

Also, for example, an alignment division function. In conventional liquid crystal display devices, in order to uniformly align the liquid crystal molecules, polyimide is applied in advance on the transparent conductive film provided on both substrates sandwiching the liquid crystal, and the surface is uniformly rubbed. Process it.
However, in TN type liquid crystal used in many liquid crystal display devices, in principle, it is difficult to obtain a wide viewing angle. In a halftone display state, light leaks at an oblique viewing angle, and the contrast is lowered and displayed. Quality deteriorates. That is, there is a problem that the viewing angle with good contrast is narrow.

  As one technique for solving such a problem, the liquid crystal molecules in one pixel are controlled so that the alignment direction of the liquid crystal molecules is not a single direction but a plurality of directions, and uniform halftone display is performed in a plurality of directions. In other words, an MVA (Multi-domain Vertical Alignment) -LCD having a wide viewing angle has been developed.

  FIG. 8A is an explanatory diagram schematically showing a cross section of such an MVA-LCD. As shown in FIG. 8A, the MVA-LCD (80) includes a TFT side substrate (20) provided with alignment control protrusions (22a) and (22b) via liquid crystal molecules (21), and an alignment control. The color filter (8) provided with the protrusions (23) is arranged, but the alignment control protrusions (22a), (22b) and the alignment control protrusions (23) are provided at alternate positions in one pixel. ing.

As shown by the thick white arrow in FIG. 8A, in the state at the time of voltage application, the liquid crystal molecules between the alignment control protrusion (22a) to the alignment control protrusion (23) are inclined diagonally to the left in the figure. The liquid crystal molecules between the alignment control protrusion (23) and the alignment control protrusion (22b) are inclined obliquely to the right. That is, the alignment of the liquid crystal molecules is controlled by providing protrusions instead of the rubbing treatment.
In the example shown in FIG. 8A, one pixel is divided into two, and the tilt direction of the liquid crystal molecules is two in one pixel, and the liquid crystal display device has excellent viewing angle characteristics. 8B and 8C are an enlarged plan view and a cross-sectional view showing another pixel of another example of the color filter for MVA-LCD. This example is a color filter (9) on which an orientation control protrusion (93) having a circular planar shape is formed. The tilt direction of the liquid crystal molecules becomes multidirectional within one pixel.

Functions added to the color filter (4) shown in FIG. 4 include a high reliability function, a combined transmission / reflection function, a spectral characteristic adjustment function, and the like in addition to the spacer function and the alignment division function. Among these functions, one function or a plurality of functions are added to the color filter (4) shown in FIG. 4 based on the use and specification of the color filter.
Therefore, for example, when manufacturing a color filter having a specification in which a spacer function and an orientation division function are added to the color filter (4) shown in FIG. 4, after producing the color filter (4) shown in FIG. Then, the alignment control protrusion (93) shown in FIG. 8 is formed, and then the photo spacer (44) shown in FIG. 7 is formed.
That is, two steps of forming the alignment control protrusion and forming the photospacer are added to manufacture a color filter having a desired specification.

  On the other hand, FIG. 6 is a partial cross-sectional view of an example of a color filter in which an alignment control protrusion and a photo spacer are provided on a basic color filter. This color filter has a laminated structure of the photo spacer. Yes. The above-mentioned addition for forming a photo spacer by forming a plurality of intermediate layers constituting the photo spacer simultaneously with the formation of the colored pixels and forming an upper pattern constituting the photo spacer simultaneously with the formation of the alignment control protrusion. Therefore, the color filter including the alignment control protrusion and the photo spacer can be manufactured at low cost.

As shown in FIG. 6, this color filter has a light shielding portion (41P) within a pixel, a colored pixel (42), an alignment control protrusion (which is formed simultaneously with a black matrix (not shown) on a glass substrate (40). Mv), a laminated photospacer (Ps) is formed.
The laminated photo spacer (Ps) shown as an example includes an extension pattern (P1) of the first color pixel on the in-pixel light shielding portion (41P), a spacer pattern (P2) of the second color, and a third color spacer. The spacer pattern (P3) and the upper pattern (P4) are stacked. The height of the laminated photo spacer (Ps) is the height (H) from the upper surface of the first color pixel (42) to the upper surface of the upper pattern (P4) of the laminated photo spacer.

The extension pattern (P1) of the first color pixel is an extension of the first color pixel (42). The second color spacer pattern (P2) is formed simultaneously with the formation of the second color coloring pixels (not shown). The third-color spacer pattern (P3) is formed simultaneously with the formation of the third-color colored pixels (not shown). The upper pattern (P4) of the laminated photospacer is formed simultaneously with the formation of the alignment control protrusion (Mv). Therefore, the additional step for forming the photospacer is unnecessary.
In FIG. 6, the transparent conductive film provided on the colored pixel (42) is omitted.

  FIG. 9 is a plan view showing an arrangement of colored pixels in another example of a color filter used in a liquid crystal display device. As shown in FIG. 9, the colored pixel (42) is composed of a red colored pixel (42R), a green colored pixel (42G), and a blue colored pixel (42B). It is one unit as a color reproduction filter of the apparatus. The colored pixel units are arranged on the entire screen of the color filter.

This example is an example in which a laminated photospacer (Ps) is provided at a substantially central portion of the red colored pixel (42R). The laminated photospacer (Ps) has, for example, the laminated structure shown in FIG. FIG. 6 corresponds to an enlarged view taken along line XX ′ in FIG. In FIG. 9, the orientation control protrusion (Mv) is omitted. The size of one colored pixel is, for example, about a × b = 200 μm × 600 μm, and the size of the laminated photo spacer is, for example, about c × d = 55 μm × 55 μm.
In this color filter, for example, one colored photo spacer (Ps) is provided for every three pixels, with one red colored pixel (42R) as one pixel.

  In general, the height (H) of the laminated photospacer is influenced by variations in the height of each layer constituting the light shielding portion (41P) in the pixel and the underlying photospacer. Therefore, the conventional photospacer (44) shown in FIG. Compared to), the variation tends to be large, but manufacturing is performed under the careful management in each process.

FIG. 10 shows a colored pixel in which the size of one colored pixel is a ′ × b ′ = 200√3 μm × 600√3 μm≈350 μm × 1000 μm, that is, approximately three times the area of the colored pixel shown in FIG. It is an example of the arrangement | sequence of. The size of the colored pixels is substantially proportional to the viewing distance when the liquid crystal display device is used, and the example shown in FIG. 10 is applied to a color filter in a liquid crystal TV having a diagonal size of about 50 inches, for example. It is.
As shown in FIG. 10, one laminated photospacer is provided for each color pixel. The size of the laminated photospacer is the same as that of the laminated photospacer shown in FIG. 9, and is about c × d = 55 μm × 55 μm.

  When assembling the color filter as a liquid crystal panel, a load is applied between both the color filter substrate and the counter substrate to appropriately deform the laminated photo spacer to obtain a desired gap. At this time, the product of the area and the number of the laminated photo spacers per unit area with respect to the load per unit area, that is, the total area of the laminated photo spacers per unit area is important for obtaining a desired gap. It has become.

From the viewpoint of the total area of the laminated photospacer, one of the laminated photospacers having an area approximately three times the area of the laminated photospacer shown in FIG. It is also conceivable to provide the colored pixels (not shown).
However, in order to keep the gap between the two substrates in-plane uniform, it is preferable to narrow the interval between the laminated photo spacers and the laminated photo spacers. Therefore, as shown in FIG. It is preferable that one is provided.

  As shown in FIG. 9, when the size of one colored pixel is about 200 μm × 600 μm, the relationship of the total area of the laminated photospacer with respect to the load is 3 pixels, that is, the size is 55 μm per area of 200 μm × 600 μm × 3. Since one laminated photo spacer having a size of about 55 μm is in a preferable relationship, as shown in FIG. 10, the size of the laminated photo spacer shown in FIG. It can be said that it is appropriate that one laminated photo spacer having the same size as 55 μm is provided for each color pixel.

  However, in the laminated photospacer shown in FIG. 10, the laminated photospacer (Ps-R) provided in the red colored pixel (42R) and the laminated photospacer provided in the green colored pixel (42G) ( Ps-G) and the laminated photo spacer (Ps-B) provided in the blue colored pixel (42B) have a problem that their heights are different from each other.

FIG. 11 is a cross-sectional view of a laminated photospacer showing an enlarged cross section taken along line XX ′ in FIG. As shown in FIG. 11, the height of the laminated photo spacers provided in the colored pixels of each color is equal to the height (H1−) of the laminated photo spacer (Ps-R) provided in the red colored pixels (42R). R), the height (H1-G) of the stacked photo spacer (Ps-G) provided in the green colored pixel (42G), and the stacked photo spacer (Ps-) provided in the blue colored pixel (42B). The height is lower in the order of the height of B) (H1-B) [(H1-R)>(H1-G)> (H1-B)].
In FIG. 11, the alignment control protrusion (Mv) and the upper pattern (P4) shown in FIG. 6 are omitted.

As described above, the height of the laminated photo spacer is generally different from the height of the coating film of the photoresist applied to form the next pattern on the pattern. The height is affected by the difference (step) between the height of the upper surface of the pattern and the height around the pattern. That is, as the level difference increases, the height of the coating applied on the pattern decreases.
The height of the coating film is influenced not only by the difference between the height of the upper surface of the pattern and the height of the periphery (step), but also by the difference in the size of the pattern or the difference in the fluidity of the photoresist used.

FIG. 12 is a cross-sectional view for explaining the behavior of the height of the laminated coating film.
FIG. 12A is an explanatory diagram of the influence of the height difference of the coating film. As shown in FIG. 12A, a pattern in which a high pattern (P11) having a height (T1) and a low pattern (P12) having a height (T2) are already formed on a glass substrate (40). (T1> T2). The width (W1) of the high pattern (P11) and the width (W2) of the low pattern (P12) are the same (W1 = W2).
When a coating film having a height (T0) is formed on the glass substrate (40) on which the high pattern (P11) and the low pattern (P12) have already been formed, the height of the coating film on the high pattern (P11) ( T3) is low, and the height (T4) of the coating film on the low pattern (P12) is high (T3 <T4). This is because the step (D1, D1 = T1) of the high pattern (P11) before application is larger than the step (D2, D2 = T2) of the low pattern (P12) before application (D1> D2).

Moreover, FIG.12 (b) is explanatory drawing of the influence by the difference in the size of the height of a coating film.
As shown in FIG. 12B, a wide pattern (P13) having a width (W3) and a narrow pattern (P14) having a width (W4) are provided on the glass substrate (40) as patterns already formed. (W3> W4). The height (T5) of the wide pattern (P13) and the height (T6) of the narrow pattern (P14) are the same (T5 = T6).
When a coating film having a height (T0) is formed on the glass substrate (40) on which the wide pattern (P13) and the narrow pattern (P14) have already been formed, the height of the coating film on the wide pattern (P13) ( T7) is high, and the height (T8) of the coating film on the narrow pattern (P4) is low (T7> T8). This is because the width (W3) of the wide pattern (P13) before application is larger than the width (W4) of the narrow pattern (P14) before application (W3> W4).

  13 and FIG. 14, as shown in FIG. 11, the height of the laminated photo spacers provided in the colored pixels of each color is the same as that of the laminated photo spacers (Ps-R) provided in the red colored pixels (42 </ b> R). ), The stacked photospacer (Ps-G) provided in the green colored pixel (42G), and the stacked photospacer (Ps-B) provided in the blue colored pixel (42B) in this order. FIG. In FIG. 13, a description is added from the viewpoint of the difference between the height of the existing pattern and the height of the periphery, that is, mainly from the viewpoint of the step.

FIG. 13A shows a state in which the in-pixel light shielding portion (41P) has already been provided on the glass substrate (40). The width (W11) and height (T11) of the in-pixel light shielding portion (41P) are the stacked photo spacer (Ps-R) in the red colored pixel, the stacked photo spacer (Ps-G) in the green colored pixel, The laminated photo spacers (Ps-B) in the blue colored pixels are both the same. The size of the in-pixel light shielding portion (41P) is, for example, about 55 μm × 55 μm (W11 = 55 μm).

  FIG. 13B shows a state in which a red coating film is formed as the first color. Since the step (D11) of the laminated photospacer (Ps-R) is the same as the steps of the laminated photospacer (Ps-G) and the laminated photospacer (Ps-B), the step on the light shielding portion (41P) in each pixel. The height of the red coating film is the same ((T12-R) = (T12-G) = (T12-B)).

In FIG. 13C, an extension pattern (P1-R) of red colored pixels is formed on the laminated photospacer (Ps-R), and a green spacer pattern (Ps-G) is formed on the laminated photospacer (Ps-G). P1-G) is formed, and a blue spacer pattern (P1-B) is formed on the laminated photospacer (Ps-B). The extension pattern (P1-R) has a size of about 55 μm × 55 μm, and the spacer pattern (P1-G) and the spacer pattern (P1-B) have the same size, for example, about 30 μm × 30 μm [( W12−R) = 55 μm, (W12−G) = (W12−B) = 30 μm].
The level difference at this stage is [the level difference (D12-R) of the multilayer photospacer (Ps-R)] <[the level difference (D12-G) of the multilayer photospacer (Ps-G)] = [layered photospacer (Ps− B) (D12-B)].

  FIG. 13D shows a state in which a green coating film is formed as the second color. Since the step (D12-R) of the laminated photo spacer (Ps-R) is low, the coating film (T13-R) is high, and the step (D12-G) and the laminated photo spacer (Ps) of the laminated photo spacer (Ps-G) are high. Since the step (D12-B) of -B) is the same and high, the coating film (T13-G) and the coating film (T13-B) are the same and low [(T13-R)> (T13-G) = (T13-B)].

In FIG. 14A, a green spacer pattern (P2-R) is formed on the laminated photospacer (Ps-R), and an extended pattern of green colored pixels (Ps-G) is formed on the laminated photospacer (Ps-G). P2-G) is formed, and a green spacer pattern (P2-B) is formed on the laminated photospacer (Ps-B). The size of the spacer pattern (P2-R) and the extension pattern (P2-G) is the same, about 30 μm × 30 μm, and the size of the spacer pattern (P2-B) is, for example, about 16 μm × 16 μm ( W13−R≈W13−G = 30 μm, W13−B = 16 μm).
The step at this stage is [step (D13-R) of laminated photospacer (Ps-R)] ≦ [step (D13-G) of laminated photospacer (Ps-G)] <[laminated photospacer (Ps− B) (D13-B)].

FIG. 14B shows a state in which a blue coating film is formed as the third color. Since the step (D13-R) of the laminated photospacer (Ps-R) is low, the coating film (T14-R) is high and the coating film height is the coating film (T14-G) and coating film (T13-B). And lower in order.
In FIG. 14C, a blue spacer pattern (P3-R) is formed on the laminated photo spacer (Ps-R), and a blue spacer pattern (P3-G) is formed on the laminated photo spacer (Ps-G). ) Is formed, and an extended pattern (P3-B) of blue colored pixels is formed on the laminated photospacer (Ps-B).

The height of the laminated photospacer obtained as described above is the height (H2-R) of the laminated photospacer (Ps-R) in the red colored pixel having a low level difference when forming a coating film through the above process. ) Is the highest (step (D14-R) = height (H2-R)).
Further, the height (H2-B) of the laminated photo spacer (Ps-B) in the blue colored pixel having a high step when forming the coating film through the above process is the lowest (step (D14-R)). = Height (H2-R)). [(H2-R)>(H2-G)> (H2-B)].

  Specifically, the size of the in-pixel light shielding portion (41P), the extension pattern of the colored pixels, and the size of the spacer pattern are respectively the above-mentioned sizes, and the height (T11) of the in-pixel light shielding portion (41P) is 1. When the height of the colored pixel of each color is 25 μm and 1.70 μm, the height (H2-R) of the laminated photo spacer (Ps-R) in the red colored pixel shown in FIG. The difference in the height (H2−B) of the laminated photo spacer (Ps−B) in the blue colored pixel is about 0.2 μm.

When the difference in the height of the laminated photo spacers becomes large, the gap between the substrates of the liquid crystal display device becomes non-uniform, which adversely affects the display quality of the liquid crystal display device.
JP 2005-3854 A Japanese Patent Laid-Open No. 11-344700 JP 2001-512266 A JP 2002-236371 A

  The present invention has been made in view of the above problems, and is a color filter for a liquid crystal display device in which at least a black matrix, an in-pixel light shielding portion, a colored pixel, an alignment control protrusion, and a laminated photospacer are sequentially formed on a glass substrate. In the above, each layer constituting the laminated photo spacer is an extended pattern or spacer pattern of the colored pixel formed simultaneously with the formation of the colored pixel, and an upper pattern formed simultaneously with the formation of the alignment control protrusion, and the laminated photo spacer However, it is an object of the present invention to provide a color filter for a liquid crystal display device in which there is no difference in the height of the laminated photospacer even if it is formed on the in-pixel light shielding portion provided in the colored pixels of each color.

The present invention relates to a color filter for a liquid crystal display device in which at least a black matrix, an in-pixel light shielding portion, a colored pixel, an alignment control protrusion, and a laminated photo spacer are sequentially formed on a glass substrate.
1) The laminated photo spacer is formed on an in-pixel light-shielding portion provided in a colored pixel of each color,
2) It is composed of at least an extended pattern or spacer pattern of colored pixels formed simultaneously with the formation of the colored pixels, and an upper pattern formed simultaneously with the formation of the alignment control protrusions,
3) The size of the intra-pixel light-shielding portion is the same as the intra-pixel light-shielding portion in the colored pixel formed in the first color, the intra-pixel light-shielding portion in the colored pixel formed in the second color, and the third color. A color filter for a liquid crystal display device, wherein the color filter is larger in the order of the in-pixel light shielding portion in the colored pixel.

Further, the present invention is the color filter for a liquid crystal display device according to the above invention, when the height of the in-pixel light shielding portion provided in the colored pixels of each color and the height of the colored pixels of each color are set.
1) A relationship 1 between the height of the laminated photo spacer in the colored pixel formed in the first color and the size of the in-pixel light shielding portion in the colored pixel formed in the first color is obtained in advance. The size of the in-pixel light-shielding portion in the formed colored pixel is the size of the in-pixel light-shielding portion corresponding to the desired height of the laminated photo spacer in the relation 1.
2) A relationship 2 between the height of the laminated photo spacer in the colored pixel formed in the second color and the size of the in-pixel light shielding portion in the colored pixel formed in the second color is obtained in advance. The size of the in-pixel light-shielding portion in the formed colored pixel is the size of the in-pixel light-shielding portion corresponding to the desired height of the laminated photo spacer in the relationship 2.
3) A relationship 3 between the height of the laminated photo spacer in the colored pixel formed in the third color and the size of the in-pixel light shielding portion in the colored pixel formed in the third color is obtained in advance. The size of the in-pixel light-shielding portion in the formed colored pixel is the size of the in-pixel light-shielding portion corresponding to the desired height of the laminated photo spacer in the relation 3. It is a color filter.

Further, the present invention provides a color filter for a liquid crystal display device in which at least a black matrix, an in-pixel light shielding portion, a colored pixel, an alignment control protrusion, and a laminated photo spacer are sequentially formed on a glass substrate.
1) The laminated photo spacer is formed on an in-pixel light-shielding portion provided in a colored pixel of each color,
2) it is composed of at least scan pacer pattern of colored pixels formed simultaneously with the formation of colored pixels, and the upper pattern formed simultaneously with the formation of the alignment control projection,
3) the size of the pixel in the light blocking portion provided in the colored pixels of the respective colors are the same, the size of the scan pacer pattern of colored pixels formed on the pixel shading unit may contain coloring formed on the first color scan pacer pattern of colored pixels of the first color formed on the pixel light blocking part in the pixel, the first color of the colored pixels formed on the second color to the formed colored pixel shading portion on the pixel scan pacer pattern is the color filter for a liquid crystal display device, characterized in that descending order of the scan pacer pattern of the first color of the colored pixels formed on the pixel light-shielding portion in the color pixel formed in the third color .

  According to the present invention, the laminated photo spacer is formed on the in-pixel light shielding portion provided in the colored pixels of each color, and at least the extension pattern or spacer pattern of the colored pixels formed simultaneously with the formation of the colored pixels, and the alignment control protrusion The size of the in-pixel light-shielding portion is the same as that of the first-color colored pixel, the in-pixel light-shielding portion in the second-colored pixel, and the third-color light-shielding portion. In the color filter for the liquid crystal display device in which the black matrix, the in-pixel light-shielding portion, the colored pixel, the alignment control protrusion, and the laminated photo-spacer are sequentially formed, the laminated photo-spacer Even if it is provided in the colored pixels of each color, it becomes a color filter for a liquid crystal display device with no difference in the height of the laminated photo spacer.

Further, according to the present invention, the laminated photo spacer is formed on the in-pixel light-shielding portion provided in the colored pixels of each color, and at least the extended pattern or spacer pattern of the colored pixels formed simultaneously with the formation of the colored pixels, and the orientation The size of the extension pattern or spacer pattern of the colored pixel formed on the light shielding part in the pixel, which is composed of the upper pattern formed simultaneously with the formation of the control protrusion, is the light shielding in the pixel in the colored pixel formed in the first color. Extension pattern or spacer pattern of colored pixels of the first color formed on the part, extended pattern or spacer of colored pixels of the first color formed on the intra-pixel light shielding part in the colored pixels formed on the second color Pattern, extended pattern or spacer pattern of colored pixels of the first color formed on the in-pixel light shielding portion in the colored pixels formed of the third color Therefore, in the color filter for a liquid crystal display device in which the black matrix, the light shielding portion in the pixel, the colored pixel, the alignment control protrusion, and the laminated photospacer are sequentially formed, the laminated photospacer is provided in the colored pixel of each color. However, it becomes a color filter for liquid crystal display devices with no difference in the height of the laminated photo spacer.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a partial cross-sectional view for explaining one embodiment of a laminated photospacer in a color filter for a liquid crystal display device according to the present invention. The color filter for a liquid crystal display device according to the present invention is obtained by sequentially forming at least a black matrix, an in-pixel light shielding portion, a colored pixel, an alignment control protrusion, and a laminated photo spacer on a glass substrate. The laminated photospacer is formed on the in-pixel light shielding portion provided in the colored pixels of each color. Further, the laminated photospacer includes at least a color pixel extension pattern or spacer pattern formed simultaneously with the formation of the color pixel, and an upper pattern formed simultaneously with the formation of the alignment control protrusion.

FIG. 1A shows a stage in which a pixel light-shielding portion is provided on a glass substrate (40). The in-pixel light shielding portion (41P-1) of the laminated photo spacer (Ps-1) provided in the colored pixel of the first color on the glass substrate (40) and the laminated photo spacer provided in the colored pixel of the second color. The (Ps-2) in-pixel light shielding portion (41P-2) and the in-pixel light shielding portion (41P-3) of the laminated photo spacer (Ps-3) provided in the colored pixel of the third color are shown. Yes.
The sizes of the light shielding portions in the pixels are the light shielding portions in the pixels (41P-1) in the colored pixels of the first color, the light shielding portions in the pixels (41P-2) in the colored pixels of the second color, and the coloring of the third color. It is characterized by the order of the in-pixel shading part (41P-3) in the pixel being larger [(W21-1) <(W21-2) <(W21-3)]. Further, the heights of these in-pixel light-shielding portions are the same [(T21-1) = (T21-2) = (T21-3)].

FIG. 1B shows a stacked photo spacer (PS-1) provided in the colored pixel of the first color, a stacked photo spacer (Ps-2) provided in the colored pixel of the second color, and the third color. It is sectional drawing explaining the structure of the lamination | stacking photospacer (Ps-3) provided in the coloring pixel.
An extension pattern or spacer pattern (P1-1, P1-2, P1-3) of colored pixels of the first color on the glass substrate (40) on which the in-pixel light-shielding portion shown in FIG. The second color coloring pixel extension pattern or spacer pattern (P2-1, P2-2, P2-3), followed by the third color coloring pixel extension pattern or spacer pattern (P3-1, P3-2, P3-3) is obtained by sequentially forming. In FIG. 1B, the upper pattern formed simultaneously with the formation of the alignment control protrusion is omitted.

  The extension pattern or spacer pattern (P1-1, P1-2, P1-3) of the colored pixel of the first color is an in-pixel light shielding portion (41P-1), an in-pixel light shielding portion ( 41P-2) and a size smaller than the size of each lower layer pattern in accordance with the size of the in-pixel light shielding portion (41P-3). Extension pattern or spacer pattern (P2-1, P2-2, P2-3) of the second color pixel and extension pattern or spacer pattern (P3-1, P3-2, P3-) of the third color pixel Similarly, in 3), each is formed in a small size in accordance with the size of the underlying lower layer pattern.

As described above, in the color filter for the liquid crystal display device according to the present invention, the size of the in-pixel light shielding portion of the laminated photo spacer is the in-pixel light shielding portion (41P-1) in the first color pixel and the second color pixel. In this order, the in-pixel shading part (41P-2) in this order and the in-pixel shading part (41P-3) in the colored pixel of the third color are in this order, so the difference between the height of the upper surface of the pattern and the surrounding height ( The height of the coating film due to the level difference is corrected, and the laminated photo spacer (PS-1) provided in the first color pixel is provided in the second color pixel. The heights of the stacked photospacer (Ps-2) and the stacked photospacer (Ps-3) provided in the colored pixel of the third color can be substantially the same height [(H3 -1) = (H3-2) = (H3-3)].

  FIG. 2 is an explanatory diagram of relation 1, relation 2, and relation 3 in the present invention according to claim 2. In the laminated photospacer shown in FIG. 1, that is, the size of the in-pixel light shielding portion that is the lower layer of the laminated photospacer is the in-pixel light shielding portion (41P-1) in the colored pixel formed in the first color, and the second color In the laminated photospacer characterized in that the in-pixel light-shielding portion (41P-2) in the colored pixel formed in the first order and the in-pixel light-shielding portion (41P-3) in the colored pixel formed in the third color are in this order. When the height of the in-pixel light-shielding portion provided in the colored pixels of each color and the height of the colored pixel of each color are set, specifically, the height of the in-pixel light-shielding portion is set to 1.25 μm, each color When the height of the colored pixel is set to 1.70 μm, the height (H3-1) of the laminated photo spacer (Ps-1) in the colored pixel formed in the first color and the first color are formed. In-pixel light shielding portion (41P-1) The relationship 1 shown in FIG. 2 is obtained in advance for the relationship 1 of the size (W21-1).

Similarly, the height (H3-2) of the laminated photo spacer (Ps-2) in the colored pixel formed in the second color and the in-pixel light shielding portion (41P-) in the colored pixel formed in the second color. The relationship 2 obtained in advance for the relationship 2 of the size (W21-2) of 2) is the relationship 2 shown in FIG.
Similarly, the height (H3-3) of the laminated photo spacer (Ps-3) in the colored pixel formed in the third color and the in-pixel light shielding portion (in the colored pixel formed in the third color) The relationship 3 obtained in advance for the relationship 3 of the size (W21-3) of 41P-3) is the relationship 3 shown in FIG.

In FIG. 2, the horizontal axis represents the size (S) of the in-pixel light shielding portion, and the vertical axis represents the height (H) of the laminated photo spacer. The height of the laminated photo spacer obtained by providing the in-pixel light shielding portion having the size (S) shown on the horizontal axis and forming the laminated photo spacer thereon becomes the height (H) shown on the vertical axis. Therefore, in a certain color filter, when the desired height of the laminated photo spacer is 3.7 μm, for example, as shown by the arrow in FIG. 2, the height (H) = 3.7 μm in relation 1 A size (S) of approximately 3 × 10 ³ μm ² corresponding to is appropriate as the size (W21-1) of the in-pixel light-shielding portion (41P-1) in the colored pixel formed in the first color.

In the second color, the desired stacked photospacer has the same height of 3.7 μm. Similarly, as shown by the arrow in FIG. 2, the height (H) = 3. A size (S) of approximately 8 × 10 ³ μm ² corresponding to 7 μm is appropriate as the size (W21-2) of the in-pixel light-shielding portion (41P-2) in the colored pixel formed in the second color.
In the third color, the desired laminated photo spacer has the same height of 3.7 μm. Similarly, as shown by the arrow in FIG. 2, the height (H) = A size corresponding to 3.7 μm (S) of about 10 × 10 ³ μm ² is appropriate as the size (W21-3) of the in-pixel light shielding portion (41P-3) in the colored pixel formed in the third color. Become.

  Thus, by forming the in-pixel light-shielding portion having the size using the relation 1, the relation 2, and the relation 3, the laminated photo spacer (Ps-1) provided in the colored pixel of the first color, the second The stacked photo spacers (Ps-2) provided in the colored pixels and the stacked photo spacers (Ps-3) provided in the third colored pixels have substantially the same height. [(H3-1) = (H3-2) = (H3-3)].

FIG. 3 is a cross-sectional view for explaining an example of the laminated photospacer according to the third aspect of the present invention. FIG. 3A shows the stage where the in-pixel light-shielding portion is provided on the glass substrate (40). The in-pixel light shielding portion (41P-11) of the laminated photo spacer (Ps-11) provided in the colored pixel of the first color on the glass substrate (40) and the laminated photo spacer provided in the colored pixel of the second color. The (Ps-12) intra-pixel light shielding part (41P-12) and the intra-pixel light shielding part (41P-13) of the laminated photo spacer (Ps-13) provided in the colored pixel of the third color are shown. Yes.

  The sizes of the in-pixel light shielding portions are the in-pixel light shielding portion (41P-11) in the colored pixel of the first color, the in-pixel light shielding portion (41P-12) in the colored pixel of the second color, and the coloring of the third color. All of the intra-pixel shading portions (41P-13) in the pixel have the same size and the same height [(W31-11) = (W31-12) = (W31-13), (T21-11) = (T21-12) = (T21-13)].

FIG. 3B shows a stacked photo spacer (Ps-11) provided in the first color pixel, a stacked photo spacer (Ps-12) provided in the second color pixel, and the third color. It is sectional drawing explaining the structure of the lamination | stacking photospacer (Ps-13) provided in the coloring pixel.
The first color spacer pattern (P1-11, P1-12, P1-13) and then the second color spacer are formed on the glass substrate (40) on which the in-pixel light shielding portion shown in FIG. A pattern (P2-11, P2-12, P2-13) and then a third color spacer pattern (P3-11, P3-12, P3-13) are sequentially formed. In FIG. 3B, the upper pattern formed simultaneously with the formation of the alignment control protrusion is omitted.

  In the present invention, the size of the spacer pattern formed on the in-pixel light shielding portion is the first color spacer formed on the in-pixel light shielding portion (41P-11) in the colored pixel formed in the first color. The pattern (P1-11), the first color spacer pattern (P1-12) formed on the in-pixel light shielding portion (41P-12) in the colored pixel formed in the second color, and formed in the third color Further, the first color spacer pattern (P1-13) formed on the in-pixel light-shielding portion (41P-13) in the colored pixels is larger in order. [(W32-11) <(W32-12) <(W32-13)].

  The second color spacer pattern (P2-11, P2-12, P2-13) is in accordance with the size of the spacer pattern (P1-11, P1-12, P1-13), which is the lower layer pattern of each. It is formed in a size smaller than the size of each lower layer pattern. Similarly, the third color spacer patterns (P3-11, P3-12, P3-13) are each formed in a small size in accordance with the size of the lower layer pattern immediately below.

  As described above, the size of the spacer pattern of the laminated photo spacer in the color filter for the liquid crystal display device according to the present invention is the first one formed on the in-pixel light shielding portion (41P-11) in the colored pixel formed in the first color. The first color spacer pattern (P1-11), the first color spacer pattern (P1-12) formed on the in-pixel light shielding portion (41P-12) in the colored pixels formed in the second color, the third color Since the first-color spacer pattern (P1-13) formed on the in-pixel light-shielding portion (41P-13) in the colored pixels formed in the color is larger in order, the height of the upper surface of the pattern and the surrounding area The height of the coating film due to the height difference (step) is corrected, and the laminated photo spacer (Ps-11) provided in the first color pixel and the second color pixel The stacked photo spacer (Ps-12) provided in the third color pixel and the stacked photo spacer (Ps-13) provided in the colored pixel of the third color should have substantially the same height. [(H3-11) = (H3-12) = (H3-13)].

(A), (b) is a fragmentary sectional view explaining one Example of the lamination | stacking photospacer in the color filter for liquid crystal display devices by this invention. It is explanatory drawing of the relationship 1, the relationship 2, and the relationship 3 of this invention concerning Claim 2. (A), (b) is sectional drawing explaining an example of the lamination | stacking photospacer in this invention concerning Claim 3. FIG. It is the top view which showed typically an example of the color filter used for a liquid crystal display device. FIG. 5 is a cross-sectional view taken along line X-X ′ of the color filter illustrated in FIG. 4. It is a fragmentary sectional view of an example of the color filter provided with the protrusion for orientation control and the photo spacer. It is a fragmentary sectional view of the color filter for liquid crystal display devices in which the photo spacer was formed. (A) is explanatory drawing which showed the cross section of MVA-LCD typically. (B) is an enlarged plan view showing one pixel of another example of the color filter for MVA-LCD. (C) is sectional drawing which expands and shows one pixel of the other example of the color filter for MVA-LCD. It is a top view which shows the arrangement | sequence of the colored pixel in the other example of the color filter used for a liquid crystal display device. It is explanatory drawing of the arrangement | sequence of the colored pixel which has an area of about 3 times the area of a colored pixel. It is sectional drawing of the lamination | stacking photospacer which expands and shows the cross section in the X-X 'line in FIG. (A) is explanatory drawing of the influence by the level | step difference of the height of a coating film. (B) is explanatory drawing of the influence by the difference in the size of the height of a coating film. (A)-(d) is sectional drawing explaining the process in which a lamination | stacking photospacer becomes low in order. (A)-(c) is sectional drawing explaining the process in which a lamination | stacking photospacer becomes low in order.

Explanation of symbols

4, 7, 8, 9 ... Color filter 21 ... Liquid crystal molecules 22a, 22b, 23, 93, Mv ... Alignment control protrusion 40 ... Glass substrate 41 ... Black matrix 41P ... Pixel Inner light-shielding portions 41P-1, 41P-2, 41P-3 ... In-pixel light-shielding portions 42 ... colored pixels 42R ... red colored pixels 42G ... green colored pixels 42B ... Blue colored pixel 43 ... Transparent conductive film 44 ... Photo spacer 80 ... MVA-LCD
D1, D2... Steps D12-R, D13-R, D14-R... Steps D12-G, D13-G, D14-G in red colored pixels D12 in green colored pixels -B, D13-B, D14-B ... Step H in the blue colored pixel ... Height of the laminated photo spacer H1-R, H2-R ... of the laminated photo spacer in the red colored pixel Height H1-G, H2-G: Height H1-B of the laminated photo spacer in the green colored pixel, H2-B: Height H3-1 of the laminated photo spacer in the blue colored pixel, H3-11... Height of the laminated photo spacer in the colored pixel of the first color in the present invention H3-1, H3-11... Height of the laminated photo spacer in the colored pixel of the second color in the present invention H3-1, H3-11... Third color in the present invention The height Mv of the laminated photo spacers in the colored pixels of ... The alignment control projections Ps ... The laminated photo spacer P1 ... The extension pattern P2 of the colored pixels of the first color ... The spacer pattern P3 of the second color. ... third-color spacer pattern P4 ... upper patterns P1-R, P2-R, P3-R ... extension patterns in red colored pixels or spacer patterns P1-G, P2-G, P3- G: Extension pattern or spacer pattern P1-B, P2-B, P3-B in green colored pixel Extension pattern or spacer pattern P1-1, P2-1, P3- in blue colored pixel 1... Extension pattern or spacer pattern P1-2, P2-2, P3-2 in the first color pixel. Extension pattern or spacer in the second color pixel. Turn P1-3, P2-3, P3-3 ... Extension pattern or spacer pattern P11 ... High pattern P12 ... Low pattern P13 ... Wide pattern P14 ... Narrow pattern Ps-R ... Stacked photo spacer Ps-G in red colored pixel Stacked photo spacer Ps-B in green colored pixel Stacked photo spacer Ps-1 in blue colored pixel , Ps-11... Laminated photo spacers Ps-2, Ps-12 in the first color pixel, Ps-3, Ps-13 in the second color pixel. Stacked photo spacers W21-1, W21-2, W21-3 in the third color pixel. Sizes W32-11, W32-12, W32-13 of the light shielding portion in the pixel in the present invention. Size of spacer pattern of the first color in the invention

Claims (3)

In a color filter for a liquid crystal display device in which at least a black matrix and an in-pixel light shielding portion, a colored pixel, an alignment control protrusion, and a laminated photo spacer are sequentially formed on a glass substrate,
1) The laminated photo spacer is formed on an in-pixel light-shielding portion provided in a colored pixel of each color,
2) It is composed of at least an extended pattern or spacer pattern of colored pixels formed simultaneously with the formation of the colored pixels, and an upper pattern formed simultaneously with the formation of the alignment control protrusions,
3) The size of the intra-pixel light-shielding portion is the same as the intra-pixel light-shielding portion in the colored pixel formed in the first color, the intra-pixel light-shielding portion in the colored pixel formed in the second color, and the third color. A color filter for a liquid crystal display device, wherein the color filter is larger in order of a light shielding portion in a pixel in a colored pixel. When the height of the in-pixel light-shielding portion provided in the colored pixels of each color and the height of the colored pixels of each color are set,
1) A relationship 1 between the height of the laminated photo spacer in the colored pixel formed in the first color and the size of the in-pixel light shielding portion in the colored pixel formed in the first color is obtained in advance. The size of the in-pixel light-shielding portion in the formed colored pixel is the size of the in-pixel light-shielding portion corresponding to the desired height of the laminated photo spacer in the relation 1.
2) A relationship 2 between the height of the laminated photo spacer in the colored pixel formed in the second color and the size of the in-pixel light shielding portion in the colored pixel formed in the second color is obtained in advance. The size of the in-pixel light-shielding portion in the formed colored pixel is the size of the in-pixel light-shielding portion corresponding to the desired height of the laminated photo spacer in the relationship 2.
3) A relationship 3 between the height of the laminated photo spacer in the colored pixel formed in the third color and the size of the in-pixel light shielding portion in the colored pixel formed in the third color is obtained in advance. 2. The size of the in-pixel light-shielding portion in the formed colored pixel is the size of the in-pixel light-shielding portion corresponding to the desired height of the laminated photo spacer in the relation 3. Color filters for liquid crystal display devices. In a color filter for a liquid crystal display device in which at least a black matrix and an in-pixel light shielding portion, a colored pixel, an alignment control protrusion, and a laminated photo spacer are sequentially formed on a glass substrate,
1) The laminated photo spacer is formed on an in-pixel light-shielding portion provided in a colored pixel of each color,
2) it is composed of at least scan pacer pattern of colored pixels formed simultaneously with the formation of colored pixels, and the upper pattern formed simultaneously with the formation of the alignment control projection,
3) the size of the pixel in the light blocking portion provided in the colored pixels of the respective colors are the same, the size of the scan pacer pattern of colored pixels formed on the pixel shading unit may contain coloring formed on the first color scan pacer pattern of colored pixels of the first color formed on the pixel light blocking part in the pixel, the first color of the colored pixels formed on the second color to the formed colored pixel shading portion on the pixel scan pacer pattern, a liquid crystal display device for color filters, wherein the descending order of the scan pacer pattern of the first color of the colored pixels formed on the pixel light-shielding portion in the colored pixels formed in a third color.

Images