JP2009229485A - Display element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal panel in which the reduction in numerical aperture is suppressed while securing a color mixing margin on the occurrence of misalignment in assembling a substrate by a black matrix layer. <P>SOLUTION: In the respective colored part groups 56a, 56b corresponding to mutually adjoining pixels 24, colored parts 52r, 52r corresponding to red and colored parts 52g, 52g corresponding to green are continuously formed over the spaces 24, respectively. A black matrix layer 61 is formed in the space between the colored parts 52r and 52b, and 52b and 52g, respectively. The reduction in numerical aperture can be suppressed while securing a color mixing margin on the occurrence of misalignment in assembling a substrate by the black matrix layer 61. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a display element including a light-shielding portion formed at a position corresponding to a colored portion having a different color.

  Conventionally, a liquid crystal panel, which is a liquid crystal display element as a display element, is configured by disposing an array substrate and a counter substrate so as to face each other and interposing a liquid crystal layer as a light modulation layer between the substrates. ) Are formed in a matrix.

In such a liquid crystal panel, for example, when a colored portion group having colored portions corresponding to each of red (R), green (G), and blue (B) is formed for each pixel on a counter substrate, color display is performed. Are arranged regularly regularly in the horizontal direction (row direction) along the scanning line in the order of red, green, and blue. In addition, a black matrix (BM) layer is formed at the boundary of each colored portion as a light shielding portion for preventing color mixing when a color gap and a positional shift occurs when the array substrate and the counter substrate are assembled. (For example, refer to Patent Document 1).
JP-A-11-84365

  However, in the liquid crystal panel, when a horizontal displacement (assembly misalignment) occurs between the array substrate and the counter substrate, the black matrix layer formed in the signal line light shielding portion is opened from the signal line light shielding portion to the opening portion. There is a problem in that the aperture ratio (transmittance) is lowered by advancing to. Further, in the structure in which the regular color layer and the black matrix layer are disposed between the color layers, the aperture ratio is reduced in all the pixels, and there is a problem that the luminance is significantly reduced in the high-definition pixels.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a display element in which a decrease in aperture ratio is suppressed while ensuring a color mixture margin when a substrate assembly error occurs.

  The present invention includes a pair of substrates arranged to face each other and a light modulation layer interposed between the substrates, and a plurality of pixels having a plurality of subpixels are adjacent to each other in one direction and the other direction. A display element that is formed in a matrix, and includes three or more colored portions of different colors corresponding to each of the sub-pixels, and a colored portion group that is formed corresponding to each of the pixels A colored layer and a light-shielding portion formed at a position corresponding to between the colored portions of different colors, and the colored layer is adjacent to the other direction while the colored portions of the same color are continuous in one direction. Among the colored portions of the colored portion groups corresponding to the pixels, the colored portions of the same color corresponding to at least one color are continuously formed across the pixels.

  Then, each colored portion corresponding to at least one color of each colored portion group corresponding to adjacent pixels is formed continuously between the pixels, and a light shielding portion is formed only between the colored portions of different colors. To do.

  According to the present invention, it is possible to suppress a decrease in the aperture ratio while securing a color mixture margin when the assembly deviation of the substrate occurs by the light shielding portion.

  Hereinafter, the configuration of the display element according to the first embodiment of the present invention will be described with reference to FIGS.

  1 to 4, reference numeral 11 denotes a liquid crystal display device as a display device. The liquid crystal display device 11 is disposed on a liquid crystal panel 12 which is a liquid crystal display element as a display element, and on the back side of the liquid crystal panel 12. And a backlight 13 as a planar light source device that emits white light, and is a so-called transmission type that transmits and uses light from the backlight 13.

  The liquid crystal panel 12 is an active matrix type liquid crystal panel capable of color display, in which an array substrate 15 as a first substrate as a substrate and a counter substrate 16 as a second substrate as a substrate are arranged to face each other. A liquid crystal layer 17 as a light modulation layer and a spacer that keeps a gap between them are interposed between 15 and 16, and a peripheral portion thereof is bonded by an adhesive layer 18 to form a rectangular display region 22 located in the center. In addition, a plurality of, for example, a plurality of, for example, three sub-pixels 23 each having three sub-pixels 23 are arranged in a matrix along one vertical direction (column direction) and the other horizontal direction (row direction). A non-display area 25 as a light shielding portion is formed in a frame shape surrounding the periphery of the display area 22. In addition, polarizing plates (not shown) are attached to the liquid crystal panel 12 on the display side of the array substrate 15 and the back surface (back surface) side of the counter substrate 16, respectively.

  As shown in FIG. 2, the array substrate 15 includes, for example, a glass substrate 30 that is an insulating substrate having translucency. On the main surface of the glass substrate 30 on the liquid crystal layer 17 side (upper side in FIG. 4). As shown in FIG. 3, scanning lines (gate wirings) 31 that are a plurality of wirings and signal lines (source wirings) 32 that are a plurality of wirings are arranged in a lattice shape so as to be substantially orthogonal to each other. A thin film transistor (TFT) 33, which is a switching element, is provided at each crossing position of the scanning line 31 and the signal line 32, and an alignment film 35 for aligning liquid crystal molecules of the liquid crystal layer 17 is formed so as to cover them. ing.

  The scanning line 31 and the signal line 32 are each formed of a member such as a conductive metal. For this reason, the scanning line 31 and the signal line 32 do not transmit light. In other words, the scanning lines 31 and the signal lines 32 have a light shielding property (reflectivity), are located between the pixels 24, and function as a wiring black matrix (BM). The scanning line 31 is formed along the horizontal direction, and the signal line 32 is formed along the vertical direction.

  The thin film transistor 33 has a gate electrode connected to the scanning line 31, a source electrode connected to the signal line 32, and a drain electrode connected to a pixel electrode that forms the pixel 24. Switching is controlled by applying a signal from the driver 36 to the gate electrode via the scanning line 31, and the pixel electrode corresponding to the signal input via the signal line 32 from the source driver 37 which is a signal line driving circuit. By applying a voltage to the pixel 24, the pixels 24 are turned on / off independently.

  Each pixel electrode is formed in a substantially square shape by a transparent conductive material such as ITO (Indium Tin Oxide), for example, and the scanning line 31 and the signal line 32 are formed so that their peripheral portions overlap.

  On the other hand, as shown in FIG. 2, the counter substrate 16 has a glass substrate 51 as a second substrate body having translucency. On the glass substrate 51, a color filter layer 52 that is a colored layer, a counter electrode, 53, an alignment film 54 for aligning liquid crystal molecules of the liquid crystal layer 17, and the like are sequentially stacked.

  As shown in FIGS. 1 and 2, the color filter layer 52 is colored corresponding to each of a plurality of primary colors capable of forming white or black by color mixture, for example, red (R), green (G), and blue (B). A plurality of colored portion groups 56 each having portions 52r, 52g, and 52b are provided, and these colored portions 52r, 52g, and 52b are formed in stripes at portions corresponding to the display region 22.

  Here, in the color filter layer 52, the colored portions 52r, 52g, and 52b having the same color are continuously formed in the vertical direction, and the colored portion 52r, the colored portion 52b, and the colored portion 52g are arranged in this order in the horizontal direction. A first colored portion group 56a arranged in a reverse direction with respect to the first colored portion group 56a in the horizontal direction, that is, a second colored portion group 56b arranged in the order of the colored portion 52g, the colored portion 52b, and the colored portion 52r. Are formed adjacent to each other in the horizontal direction. In other words, the color filter layer 52 is periodically formed in the horizontal direction with each coloring portion group 56a, 56b as one unit, that is, with six subpixels 23 as one unit. Accordingly, the colored portions 52r, 52g, and 52b are arranged in the same horizontal direction in all rows.

  Further, in the first coloring portion group 56a and the second coloring portion group 56b, any one of the coloring portions 52r, 52g, and 52b, in the present embodiment, the coloring portions 52r corresponding to red, and green The colored portions 52g corresponding to are continuously formed across the pixels 24. In other words, the coloring portion 52r located at the left end in the drawing, which is one end in the horizontal direction of the first coloring portion group 56a, is the other end in the horizontal direction of the second coloring portion group 56b adjacent to the left side in the drawing. The colored portion 52g located at the right end in the drawing which is continuous with the colored portion 52r located at the right end in the drawing and is the other horizontal end of the second colored portion group 56b is adjacent to the right side in the drawing. The first colored portion group 56a is continuous with the colored portion 52g located at the left end in the figure, which is one end in the horizontal direction. For this reason, the colored portions 52r and 52g each have a width dimension approximately twice that of the colored portion 52b, and are continuous between the adjacent sub-pixels 23 in the adjacent pixels 24.

  Further, a black matrix (BM) layer 61 is formed as a light-shielding part having a light-shielding property (reflectivity) between the colored parts 52r and 52b and between the colored parts 52b and 52g. The black matrix layer 61 is for preventing color mixture (light leakage) at the time of occurrence of color gap and horizontal displacement of the substrates 15 and 16, that is, assembly displacement, and is formed of, for example, synthetic resin, The center position in the horizontal direction is formed so as to be an intermediate position between the colored portions 52r and 52b or an intermediate position between the colored portions 52b and 52g. Further, in the black matrix layer 61, the substrates 15 and 16 are aligned so that the center position in the horizontal direction ideally matches the center position in the width direction of the signal line 32. The black matrix layer 61 is continuously formed in a straight line in the vertical direction between the colored portions 52r and 52b and between the colored portions 52b and 52g. Therefore, the black matrix layer 61 is formed only between the sub-pixels 23 in each pixel 24, and is not formed at a position corresponding to between each pixel 24,24. Further, the black matrix layer 61 is set to have a width dimension narrower than that of the signal line 32.

  The periphery of the color filter layer 52 is surrounded by a rectangular frame-shaped peripheral light shielding layer (not shown). This peripheral light shielding layer is for preventing light leakage from the periphery of the display region 22, and has the same process as the black matrix layer 61 by using the same material as the black matrix layer 61 having light shielding properties (reflectivity). It is formed with.

  The counter electrode 53 is formed of a transparent conductive material such as ITO, for example, by a sputtering method or the like at a position corresponding to the pixel electrode in the display region 22.

  The liquid crystal layer 17 is a light modulation layer formed of a predetermined liquid crystal material.

  Next, the manufacturing method of the first embodiment will be described.

  First, when manufacturing the array substrate 15, the scanning lines 31, the signal lines 32, the thin film transistors 33, etc. are formed on a large glass substrate (not shown) for the array substrate 15 (conductive portion forming step), and an alignment film material made of polyimide is used. The coating is applied in a range that covers a portion corresponding to the display area 22 of the large-sized glass substrate, and an alignment process is performed to form an alignment film (array substrate alignment film forming step).

  On the other hand, in manufacturing the counter substrate 16, a red resist solution is applied onto a large-sized glass substrate (not shown) for the counter substrate 16, and prebaked at a predetermined temperature for a predetermined time, for example, using a predetermined mask pattern and a predetermined strength. Exposure with UV light. Next, for example, development is performed for a predetermined time using a TMAH (tetramethylammonium hydride) aqueous solution having a predetermined concentration, followed by washing with water, followed by post-baking at a predetermined temperature for a predetermined time, thereby forming the colored portion 52r. Thereafter, using the green resist solution and the blue resist solution, the colored portions 52g and 52b are also formed in the same process (color filter layer forming process).

  At this time, the colored portion 52r and the colored portion 52g are formed to have a width approximately twice that of the colored portion 52b and are periodically formed in the order of the colored portions 52r, 52b, 52g, 52b, 52r in the horizontal direction.

  Further, the black matrix layer 61 is formed using a black resin by the same process as the formation of the colored portions 52r, 52g, and 52b (black matrix layer forming process).

  Further, ITO is deposited on each colored portion 52r, 52g, 52b by sputtering, and the counter electrode 53 is formed by patterning (counter electrode forming step), and then an alignment film material made of polyimide is arrayed on a large glass substrate. Application is performed so as to cover a range corresponding to the display region 22 on the substrate 15 side, and an alignment process is performed to form an alignment film 54 (opposing substrate alignment film forming step).

  Next, with a spacer interposed between the large-sized glass substrates, the adhesive layer 18 is applied to the periphery of the outer periphery of the large-sized glass substrate, and these large-sized glass substrates are bonded together (bonding process), for example, a single wafer type sealing treatment After baked for a predetermined time at a predetermined curing temperature (firing step), the large-sized glass substrate thus bonded is divided at a predetermined position to complete an empty liquid crystal panel 12 (firing step). ).

  Further, after the liquid crystal material to which the chiral material is added is vacuum-injected from a liquid crystal injection port (not shown) into the empty liquid crystal panel 12 (injection step), the liquid crystal injection port is sealed with an ultraviolet curable resin as a sealing material. The liquid crystal panel 12 is completed by attaching a polarizing plate (not shown) to each (sealing step) (polarizing plate attaching step).

  Here, when the width dimension of the signal line 32 is a and the width dimension of the black matrix layer 61 is b, for example, when the counter substrate 16 is shifted in the horizontal direction with respect to the array substrate 15, the colored portions 52r, 52b, 52g It is when (a + b) / 2 shifts that the colored portions 52b, 52r (52g), 52g adjoin each other are mixed in color. That is, in the absence of the black matrix layer 61, color mixing occurs when the boundary between different colored portions is arranged at the center position (center) in the width direction of the signal line 32. Therefore, although the mixed color margin can be increased by b / 2 by forming the black matrix layer 61 having the width dimension b, the assembly of the substrates 15 and 16 is shifted. In this case, the black matrix layer 61 advances into the opening, and the area through which light from the backlight 13 is transmitted decreases (opening ratio (transmittance) decreases).

  In the conventional case in which the black matrix layer is formed at all the boundaries of the sub-pixels 23, the aperture area is reduced in all the sub-pixels 23 regardless of the assembly displacement in the horizontal direction. For example, if the horizontal length of the opening of the sub-pixel 23 is α, the length of the vertical direction is β, and the amount of the black matrix layer protruding from the opening due to assembly displacement is γ, then the sub-pixel 23 when there is no assembly displacement. The opening area of the opening portion of the pixel 23 is α · β, and the opening area when the black matrix layer protrudes into the opening portion is α · β−γ · β in all the subpixels 23, and γ · β minutes. The aperture ratio decreases.

  Therefore, in the present embodiment, the colored portions 52r, 52r and the colored portions 52g, 52g of the colored portion groups 56a, 56b corresponding to the adjacent pixels 24, 24 are continuously formed between the pixels 24. Specifically, the colored portions 52r and 52r and the colored portions 52g and 52g corresponding to the same color are formed by periodically forming the colored portion groups 56a and 56b in which the colored portions are provided in the reverse order in the horizontal direction as one unit. Since the problem of color mixing does not occur in adjacent areas, it is not necessary to form the black matrix layer 61. Therefore, if the black matrix layer 61 is formed only between the colored parts 52r and 52b and between the colored parts 52b and 52g, When the assembly error of the substrates 15 and 16 occurs such that the substrate 16 is shifted to the left side in FIG. 1 with respect to the array substrate 15, the left side of the left side in FIG. The opening area at the sub-pixel 23 corresponding to the colored portion 52r is α · β γ · β, the opening area at the sub-pixel 23 corresponding to the right colored portion 52r is α · β, the opening area at the sub-pixel 23 corresponding to each colored portion 52b is α · β-γ · β, the left-side coloring The aperture area at the sub-pixel 23 corresponding to the portion 52g is α · β, and the aperture area at the sub-pixel 23 corresponding to the right colored portion 52g is α · β−γ · β.

  Accordingly, when the six sub-pixels 23 are considered as one cycle, the average opening area decrease in the sub-pixels 23 corresponding to the coloring portions 52r, 52b, and 52g is the sub-pixels corresponding to the coloring portions 52r and 52g. The pixel 23 becomes α · β-γ · β / 2, and the subpixel 23 corresponding to the coloring portion 52b becomes α · β-γ · β. Compared to the above-described conventional configuration, the sub-pixels corresponding to the coloring portions 52r and 52g, respectively. The decrease of the opening area in the pixel 23 is improved by γ · β / 2.

  As a result, it is possible to suppress a decrease in aperture ratio (decrease in luminance) while securing a color mixture margin when the assembly error of the substrates 15 and 16 occurs by the black matrix layer 61.

  Further, the black matrix layer 61 is formed on both sides of the colored portion 52b corresponding to the blue color having low visibility, that is, relatively dark, and the colored portions 52r and 52r corresponding to the red color and the colored portion 52g corresponding to the green color , 52g are continuous between the pixels 24, 24, so that the influence of the decrease in luminance can be further reduced.

  Next, a second embodiment will be described with reference to FIG. In addition, about the structure and effect | action similar to the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the second embodiment, in the first embodiment, the colored portion group 56 includes a third colored portion group 56c arranged in the order of the colored portion 52r, the colored portion 52g, and the colored portion 52b in the horizontal direction. The third colored portion group 56c and the fourth colored portion group 56d arranged in the reverse order in the horizontal direction, that is, in the order of the colored portion 52b, the colored portion 52g, and the colored portion 52r, are sequentially formed adjacent to each other in the horizontal direction. These two colored portion groups 56c and 56d are periodically formed in the horizontal direction as one unit.

  Therefore, the colored portions 52r and 52r corresponding to red and the colored portions 52b and 52b corresponding to blue are continuously formed between the adjacent pixels 24 and 24, respectively.

  As a result, when the six sub-pixels 23 (two pixels 24) are considered as one cycle, the average aperture area decrease in the sub-pixels 23 corresponding to the colored portions 52r and 52b is suppressed, and the substrate 15, The same effects as those of the first embodiment can be achieved, such as a reduction in aperture ratio (decrease in luminance) while securing a mixed color margin when 16 assembly deviations occur by the black matrix layer 61.

  Next, a third embodiment will be described with reference to FIG. In addition, about the structure and effect | action similar to said each embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the third embodiment, in each of the above embodiments, the colored portion group 56 includes a fifth colored portion group 56e arranged in the order of the colored portion 52b, the colored portion 52r, and the colored portion 52g in the horizontal direction. The fifth colored portion group 56e and the sixth colored portion group 56f arranged in the reverse order in the horizontal direction, that is, the colored portion 52g, the colored portion 52r, and the colored portion 52b are sequentially formed adjacent to each other in the horizontal direction. The two colored portion groups 56e and 56f are periodically formed in the horizontal direction as one unit.

  Accordingly, the colored portions 52b and 52b corresponding to blue and the colored portions 52g and 52g corresponding to green are continuously formed between the adjacent pixels 24 and 24, respectively.

  As a result, when the six sub-pixels 23 (two pixels 24) are considered as one cycle, the average aperture area decrease in the sub-pixels 23 corresponding to the colored portions 52b and 52g is suppressed, and the substrate 15, The same effects as those of the above-described embodiments can be achieved, for example, the black matrix layer 61 can secure a color mixture margin at the time of occurrence of 16 assembly deviations while suppressing a decrease in aperture ratio (decrease in luminance).

  Next, a fourth embodiment will be described with reference to FIG. In addition, about the structure and effect | action similar to said each embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the fourth embodiment, in each of the above-described embodiments, the colored portion group 56 includes a seventh colored portion group 56g arranged in the order of the colored portion 52r, the colored portion 52g, and the colored portion 52b in the horizontal direction. A colored portion 52b, a colored portion 52r, and a colored portion 52g arranged in this order, and a ninth colored portion group arranged in the order of the colored portion 52g, colored portion 52b, and colored portion 52r in the horizontal direction. 56i are sequentially formed adjacent to each other in the horizontal direction, and these three colored portion groups 56g, 56h, and 56i (9 sub-pixels 23) are periodically formed in the horizontal direction as one unit.

  Accordingly, the colored portions 52b and 52b corresponding to blue, the colored portions 52g and 52g corresponding to green, and the colored portions 52r and 52r corresponding to red are continuous between adjacent pixels 24, respectively. Is formed.

  As a result, when nine sub-pixels 23 (three pixels 24) are considered as one cycle, an average opening area decrease in the sub-pixels 23 corresponding to the coloring portions 52r, 52b, and 52g is suppressed. The same effects as those of the above-described embodiments can be achieved, for example, by reducing the aperture ratio (decrease in luminance) while securing a color mixture margin when the assembly deviation of the substrates 15 and 16 occurs by the black matrix layer 61.

  In addition, when nine sub-pixels 23 are considered as one cycle, it is possible to uniformly suppress a decrease in aperture ratio in each of the colored portions 52r, 52g, and 52b.

  In the fourth embodiment, the colored portions 52r, 52g, and 52b in each colored portion group 56 are arranged so that each of the colored portions 52r, 52b, and 52g is a pixel sequentially with nine subpixels 23 as one period. If it forms so that it may continue over 24, it can set arbitrarily.

  In each of the above embodiments, the color filter layer 52 may be periodically formed in the horizontal direction with four or more colored portion groups 56 as one unit.

  Furthermore, the color filter layer 52 may not be periodic in the horizontal direction as long as the colored portions of the colored portion group 56 adjacent to each other in the horizontal direction have the same color.

  The colored portion may be, for example, one corresponding to three colors of cyan (C), magenta (M), and yellow (Y), or one corresponding to four or more colors.

  The details of the liquid crystal panel 12 are not limited to the above configuration.

It is a top view which shows the positional relationship of the colored layer and light-shielding part of the display element of the 1st Embodiment of this invention. It is explanatory sectional drawing which shows a display element same as the above. It is a circuit diagram which shows a display element same as the above. It is explanatory drawing which shows the display apparatus provided with the display element same as the above. It is a figure which shows the positional relationship of the colored layer and light-shielding part of the display element of the 2nd Embodiment of this invention. It is a figure which shows the positional relationship of the colored layer and light-shielding part of the display element of the 3rd Embodiment of this invention. It is a figure which shows the positional relationship of the colored layer and light-shielding part of the display element of the 4th Embodiment of this invention.

Explanation of symbols

12 Liquid crystal panel as a display element
Array substrate which is 15 substrate
16 counter substrate
17 Liquid crystal layer as light modulation layer
23 Sub-pixel
24 pixels
52 Color filter layer as a colored layer
52b, 52g, 52r coloring part
56 Coloring group
61 Black matrix layer, which is a shading part

Claims (3)

A pair of substrates arranged opposite to each other and a light modulation layer interposed between the substrates, and a plurality of pixels having a plurality of subpixels are formed in a matrix adjacent to each other in one direction and the other direction. A display element,
A colored layer having a colored portion group formed corresponding to each of the pixels, having three or more colored portions of different colors corresponding to each of the subpixels;
A light-shielding portion formed at a position corresponding to between the colored portions of different colors,
In the colored layer, the colored portions of the same color are continuous in one direction, and the colored portions of the colored portions of the colored portion groups corresponding to the pixels adjacent in the other direction have the same color corresponding to at least one of the colors. The display element, wherein the colored portions are continuously formed between the pixels. Each colored part group has three colored parts corresponding to three different colors,
2. The display element according to claim 1, wherein the colored layer is periodically formed with two colored portion groups in which the three colored portions are provided in the opposite order in the other direction as one unit. The colored portion group has colored portions corresponding to red, green and blue, respectively.
Each colored portion group corresponding to the pixel adjacent in the other direction is formed such that the colored portions of red and the colored portions of green are continuously formed between the pixels,
The light shielding portion is formed between the colored portion corresponding to blue and the colored portion corresponding to red, and between the colored portion corresponding to blue and the colored portion corresponding to green. The display element according to claim 1, wherein:

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