JP2005249863A - Liquid crystal display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reliably prevent light leakage in a pixel without unnecessarily reducing display luminance. <P>SOLUTION: A liquid crystal display panel is provided with: a first electrode substrate including a plurality of pixel electrodes, a light shielding layer and a color filter; a second electrode substrate; and a liquid crystal layer interposed between the first and the second electrode substrates. The light shielding layer includes a light shielding stripe 2 disposed along a pixel boundary BD and partially overlapping a pair of adjacent pixel electrodes on both sides of the pixel boundary BD, and a first end of the light shielding stripe 2 is disposed on one side where an alignment azimuth T of liquid crystal molecules forms >90° angle to a vector extending from the pixel boundary BD toward the first end in a pixel array direction and a second end of the light shielding stripe 2 is disposed on the other side where the the alignment azimuth T of the liquid crystal molecules forms <90° angle to a vector extending from the pixel boundary BD toward the second end in the pixel array direction. The average distance Wi between the first end and the pixel boundary BD is set to be shorter than the average distance Wo between the second end and the pixel boundary BD. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention generally relates to a liquid crystal display panel in which a non-display area such as a gap provided between a plurality of pixel electrodes is shielded by a light shielding layer, and in particular, a liquid crystal display having a color filter covering the light shielding layer as a base. Regarding panels.

  In recent years, liquid crystal display devices have features such as light weight, thinness, and low power consumption, so display information such as notebook computers, monitoring devices, car navigation systems, TVs, etc., from devices with a relatively small amount of display information such as scientific calculators. It is applied to a wide range of fields up to a large amount of equipment.

  The liquid crystal display device is a liquid crystal display panel having a structure in which a liquid crystal layer is sandwiched between first and second electrode substrates. Conventionally, a cathode ray tube has been used as a display in the field of equipment with a large amount of display information. However, recently, a dot matrix type color liquid crystal display panel has come to be used to take advantage of the above-described features. In this color liquid crystal display panel, a matrix array of a plurality of pixel electrodes is disposed on the first electrode substrate, and a common electrode is disposed on the second electrode substrate so as to face the matrix array of the plurality of pixel electrodes. Here, one pixel electrode, a common electrode, and a liquid crystal layer between the pixel electrode and the common electrode constitute a one-dot display pixel. This display pixel modulates light based on a voltage applied to the liquid crystal layer from the pixel electrode and the common electrode.

  In a color liquid crystal display panel, a liquid crystal display mode is appropriately selected from the viewpoint of obtaining good contrast characteristics, contrast viewing angle characteristics, and reliability. Currently, there are Twisted Nematic (TN), Super Twisted Nematic (STN), Homogeneous (HOMO), Optical Compensated Bend (OCB), Hybrid Aligned Nematic (HAN), Vertical Align (VA), etc. It has become mainstream. For example, in the TN mode, a liquid crystal layer made of a liquid crystal composition such as nematic liquid crystal is sandwiched between a pair of electrode substrates to which two polarizing plates are added. Here, at least one of the electrode substrates is subjected to alignment treatment using a rubbing method or the like in order to obtain a liquid crystal alignment state having a pretilt that specifies the alignment direction of the liquid crystal molecules in the substrate plane.

  In color liquid crystal display panels, measures for reducing undesired light leakage are employed to improve contrast characteristics, which are optical characteristics greatly related to display performance. Specifically, a grid-like light shielding layer such as a black matrix shields a non-display area such as a gap between display pixels and a non-modulation portion in a display pixel occupied by a pixel switching element such as a thin film transistor or a diode. To be formed.

  If the non-display area is surely shielded to obtain sufficient contrast characteristics, a margin in the manufacturing process that depends on the patterning accuracy of the light shielding layer using photolithography and the alignment accuracy of the first and second electrode substrates is reduced. It is necessary to consider. In addition, the above-described contrast characteristics and contrast viewing angle characteristics are also affected by the electric field distribution near the edge of the pixel electrode that is different from the vicinity of the center by being adjacent to the gap. It is necessary to shield the light. If the area ratio of the light shielding layer increases with respect to the display area of the liquid crystal display panel in order to satisfy these needs, this will decrease the aperture ratio of the liquid crystal display panel and reduce the overall brightness. Become.

By the way, in the above-described color liquid crystal display panel, a color filter may be formed as a base of a pixel electrode, for example (see, for example, Patent Document 1). This structure is the same in a simple matrix type color liquid crystal display panel in which a pixel switching element is omitted and a plurality of pixel electrodes are integrated as a stripe electrode, and a color filter is formed as a base of the stripe electrode. This color filter is formed of a plurality of colored layers that are colored in colors such as red, green, and blue and are assigned to the corresponding pixel electrodes. These colored layers are obtained by patterning a layer that covers the entire surface of the electrode substrate for each color. When a gap is generated between these colored layers as a result of patterning, the color filter cannot be the base of the pixel electrode at least in the gap portion, and it is difficult to secure the area ratio of the pixel electrode, that is, the aperture ratio. This problem can be easily solved by further providing an underlayer that covers these colored layers as a whole. However, this leads to an increase in the number of manufacturing steps and attenuation of the amount of transmitted light.
Japanese Patent Laid-Open No. 2001-281697

  As an alternative to solve the above-mentioned problem without using this underlayer, it is conceivable to form colored layers of different colors so as to overlap each other along the pixel boundary. In this case, the partial rise of the color filter is caused by the overlapping of these colored layers. This swell does not stop at the gap between the pixel electrodes but also reaches the end of the pixel electrode. For this reason, near the edge of the pixel electrode, the refractive index anisotropy Δnd has a different value from the vicinity of the center of the pixel electrode, or the electric field with respect to the liquid crystal layer becomes oblique. Omission occurs. In the conventional design, the above-described light-shielding layer, that is, the black matrix is set to an area corresponding to the entire raised range of the color filter to improve contrast characteristics and contrast viewing angle characteristics. However, this design does not recognize that the display brightness of the liquid crystal display panel is unnecessarily reduced.

  An object of the present invention is to provide a liquid crystal display panel that can reliably prevent light leakage in a pixel without unnecessarily reducing display luminance.

  According to the present invention, a plurality of pixel electrodes arranged in the pixel array direction that are adjacent to each other across the linear pixel boundary and orthogonal to the pixel boundary, a light shielding layer that shields at least a gap between the plurality of pixel electrodes, and a plurality of pixels A first electrode substrate including a color filter which serves as a base of the electrode and covers a light shielding layer; a second electrode substrate including a common electrode facing the plurality of pixel electrodes; and an orientation direction of liquid crystal molecules at a pixel boundary on the first electrode substrate A liquid crystal layer including a liquid crystal composition specified not to be parallel and sandwiched between the first and second electrode substrates, and the light shielding layer is disposed along the pixel boundary and is formed between the pair of adjacent pixel electrodes in the pixel array direction. The light-shielding stripe includes first and second ends on both sides of the pixel boundary, and the first end has a liquid crystal molecule orientation direction from the pixel boundary to the first end in the pixel array direction. It is arranged on one side with an angle larger than 90 ° with respect to the vector, and the second end has an orientation direction of liquid crystal molecules smaller than 90 ° with respect to the vector from the pixel boundary toward the second end in the pixel array direction. A liquid crystal display panel that is disposed on the other side that forms an angle, and in which an average distance between a first end and a pixel boundary is set shorter than an average distance between a second end and a pixel boundary.

  In this liquid crystal display panel, the average distance between the first end and the pixel boundary is set shorter than the average distance between the second end and the pixel boundary. When the color filter is thicker around the gap between a pair of adjacent pixel electrodes, the liquid crystal molecules near the end of the pixel electrode located on the second end side of the light-shielding stripe are near the center of the pixel electrode. Alignment in a direction opposite to that causes alignment failure. The inventors of the present application experimentally confirmed that the liquid crystal molecules near the edge of the pixel electrode located on the first end side of the light shielding stripe are not oriented in the opposite direction to the liquid crystal molecules near the center of the pixel electrode. did. Based on the experimental results, the average distance from the pixel boundary to the first end of the light shielding stripe is set shorter than the average distance from the pixel boundary to the second end of the light shielding stripe. Thereby, since the area of the light shielding layer is reduced as a whole, light leakage in the pixel can be surely prevented without unnecessarily lowering the display luminance.

  Hereinafter, a dot matrix type color liquid crystal display panel according to a first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows the appearance of the color liquid crystal display panel, and FIG. 2 schematically shows the circuit structure of the color liquid crystal display panel.

  As shown in FIG. 1, the liquid crystal display panel includes an array substrate AR serving as a first electrode substrate, a counter substrate CT serving as a second electrode substrate facing the first electrode substrate, and a liquid crystal composition such as nematic liquid crystal. A liquid crystal layer LQ sandwiched between the array substrate AR and the counter substrate CT. The array substrate AR and the counter substrate CT are bonded together by an outer edge seal member provided so as to surround the liquid crystal composition of the liquid crystal layer LQ. In addition, a pair of polarizing plates PL are attached to the surfaces of the array substrate AR and the counter substrate CT on the side opposite to the liquid crystal layer LQ, respectively.

  In this liquid crystal display panel, m × n pixel electrodes PE in which array substrates AR are arranged adjacent to each other in a matrix, and m scanning lines Y (Y1 to Y1) arranged along the rows of these pixel electrodes PE. Ym), m × n arranged near the intersection of the n signal lines X (X1 to Xn), the scanning lines Y1 to Ym, and the signal lines X1 to Xn arranged along the column of the pixel electrodes PE. Pixel switching element 1, m auxiliary capacitance lines S arranged along the row of pixel electrodes PE, scanning line driving circuit YD for driving scanning lines Y1 to Ym, and signal line for driving signal lines X1 to Xn A drive circuit XD is provided. The scanning lines Y1 to Ym are substantially orthogonal to the signal lines X1 to Xn and are disposed substantially parallel to the storage capacitor line S. Each auxiliary capacitance line S is set to a predetermined potential obtained as a common potential VCOM from a common electrode driving circuit or the like, and capacitively couples with the pixel electrode PE in the corresponding row to constitute an auxiliary capacitance Cs. The scanning line driving circuit YD and the signal line driving circuit XD are arranged around the pixel electrode array. Each pixel switching element 1 is made of, for example, a polysilicon thin film transistor, and supplies a display signal from the signal line X to the corresponding pixel electrode PE when driven by a scanning signal from the corresponding scanning line Y. The pixel electrode PE is made of a transparent conductive member such as ITO, and the signal line X and the scanning line Y are made of a light-shielding conductive member such as metal. The pixel electrode PE is formed so as to spread over a region partitioned by the scanning line X and the signal line Y, and applies an electric field to the liquid crystal layer LQ corresponding to the display signal.

  Further, as shown in FIG. 3, the color liquid crystal display panel is a grid-like light shielding layer that shields a non-display area such as a gap between the non-modulation portion occupied by the pixel switching element 1 and the adjacent pixel electrode PE. A black matrix BM is further provided. In the present embodiment, the black matrix BM is configured using the signal lines X and the scanning lines Y as the light shielding stripes 2.

  4 schematically shows a cross-sectional structure of the color liquid crystal display panel taken along the line IV-IV shown in FIG. 3, and FIG. 5 shows a rubbing direction of the alignment treatment for the region REF shown in FIG. Although not shown in FIGS. 4 and 5, the pixel switching element 1 described above is formed on a light-transmissive insulating substrate 3 such as a glass substrate, and is covered with a color filter CF in the same manner as the light-shielding stripe 2. The plurality of pixel electrodes PE are formed using the color filter CF as a base, and are entirely covered with the alignment film 4. The alignment film 4 is aligned in the rubbing direction RB as shown in FIG. 5 so that the alignment direction of the liquid crystal molecules is not parallel to the linear pixel boundary BD orthogonal to the row direction of the pixel electrode array on the array substrate AR. Have been identified.

  On the other hand, in the counter substrate CT, the counter electrode CE is made of a transparent conductive member such as ITO formed on the light-transmissive insulating substrate 5 such as a glass substrate, and the alignment film 6 is formed so as to cover the counter electrode CE. The counter electrode CE is disposed so as to face the entire pixel electrode array which is m × n pixel electrodes PE disposed on the array substrate AR side. The alignment film 6 is rubbed in a rubbing direction that forms a predetermined angle with respect to the rubbing direction RB on the array substrate AR shown in FIG.

  In this color liquid crystal display panel, each of a plurality of display pixels is composed of one pixel electrode PE, a common electrode CE, and a part of the liquid crystal layer LQ between the pixel electrode PE and the common electrode CE. Light modulation is performed in accordance with the voltage between the pixel electrode PE and the common electrode CE. The pixel pitch, that is, the interval between the pixel boundaries BD, is set to 100 μm in the row direction of the pixel electrode array, and is set to 300 μm in the column direction of the pixel electrode array. Accordingly, each display pixel has an area of 100 μm × 300 μm divided by two pixel boundaries BD in the row direction and the column direction of the pixel electrode array. Each pixel boundary BD is sandwiched between a pair of adjacent pixel electrodes PE arranged in the row direction and the column direction of the pixel electrode array.

  The color filter CF includes a plurality of red coloring layers R, a plurality of green coloring layers G, and a plurality of blue coloring layers B. The red colored layer R, the green colored layer G, and the blue colored layer B have a stripe shape extending in the column direction of the pixel electrode array, and are repeatedly arranged in the row direction of the pixel electrode array. Thus, one color display pixel is configured using three adjacent pixel electrodes PE each having a red colored layer R, a green colored layer G, and a blue colored layer B arranged in the row direction of the pixel electrode array as bases. The overall area is 300 μm × 300 μm.

  Further, in the row direction of the pixel electrode array, the adjacent colored layers R and G, the adjacent colored layers G and B, and the adjacent colored layers B and R having different colors are overlapped on the basis of the pixel boundary BD. Here, the pixel boundary BD is a center line that bisects a section in which the adjacent colored layers R and G, the adjacent colored layers G and B, and the adjacent colored layers B and R overlap in the row direction.

  In the color liquid crystal display panel described above, the color filter CF rises due to the overlapping of the striped colored layers R, G, and B arranged in the row direction of the pixel electrode array. Incidentally, the signal line X has a thickness of 1500 mm, and the color filter CF is obtained by forming the colored layers R, G, and B entirely and patterning them by photolithography. When the colored layer G is formed first and then the colored layer B is formed on the colored layer G, the edge of the colored layer B covers the edge of the colored layer G, and as shown in FIG. A climax occurs.

  In order to cope with such a swell, the light shielding stripe 2 as the signal line X is formed asymmetrically with respect to the pixel boundary BD as shown in FIG. The light shielding stripe 2 partially overlaps a pair of adjacent pixel electrodes PE in the row direction of the pixel electrode array, and has first and second ends on both sides of the pixel boundary BD. The first end has an orientation direction of liquid crystal molecules (that is, a pretilt direction T equal to the rubbing direction RB shown in FIG. 4) with respect to a vector from the pixel boundary BD toward the first end in the row direction of the pixel electrode array, more than 90 °. The second end is arranged on one side having a large angle, and the second end is the other side in which the orientation direction of the liquid crystal molecules is smaller than 90 ° with respect to a vector from the pixel boundary BD toward the second end in the row direction of the pixel electrode array. The average distance Wi between the first end and the pixel boundary BD is set shorter than the average distance Wo between the second end and the pixel boundary BD.

  In FIG. 6, the angle θ formed by the pretilt azimuth T and the pixel boundary BD is, for example, 45 °, the average distance Wi is 6 μm, and the average distance Wo is 12 μm. φ1 is the angle formed by the pretilt azimuth with respect to the vector from the pixel boundary BD toward the second end in the row direction of the pixel electrode array, and φ2 is the pretilt azimuth from the pixel boundary BD to the first end in the row direction of the pixel electrode array. This is the angle that is made with respect to the vector that heads. These have a relationship of angle φ1 <90 ° <angle φ2. The average distances Wi and Wo are determined depending on the shape of each pixel electrode PE depending on the area occupied by the pixel switching element 1 and the wiring, and the distance from the pixel boundary BD to the adjacent pixel electrode PE is not uniform. It is a thing.

  FIG. 7 conceptually shows a liquid crystal molecular arrangement generated in the liquid crystal layer LQ when a voltage is applied. When a sufficient voltage is applied to the liquid crystal layer LQ from each pixel electrode PE and common electrode CE, the oblique electric field shown in FIG. 4 is applied to the vicinity of the ends of the pair of adjacent pixel electrodes PE due to the rise of the color filter CF. . At this time, as shown in FIG. 7, the liquid crystal molecules 12 are not affected by this oblique electric field except for a part, and tilt substantially vertically. In FIG. 7, LD is the light traveling direction, and 12a to 12e are the liquid crystal molecules 12 near the end of the adjacent pixel electrode PE. The liquid crystal molecules 12 a and 12 b are controlled by an electric field applied obliquely with the inclination of the alignment film 4 due to the protrusion of the pixel electrode PE on the first end side of the light shielding stripe 2. On the first end side, the orientation of the alignment film 4 does not cause the liquid crystal molecules 12 to be oriented in the direction opposite to the pretilt azimuth T at the interface, and the liquid crystal molecules 12a and 12b are excluded from the end portions when a voltage is applied. Like the liquid crystal molecules in the vicinity of the region of the pixel electrode PE, it tilts substantially vertically. On the other hand, the liquid crystal molecules 12c, 12d, and 12e are controlled by the electric field applied obliquely with the inclination of the surface of the alignment film 4 due to the protrusion of the pixel electrode PE on the second end side of the light shielding stripe 2. On the second end side, the tilt of the alignment film 4 causes the liquid crystal molecules 12 to be oriented in the direction opposite to the pretilt azimuth T at the interface, and the liquid crystal molecules 12c, 12d, and 12e are subjected to the application of voltage. Like the liquid crystal molecules 12 in the vicinity of the excluded pixel electrode PE, the liquid crystal molecules 12 are not vertical or tilted in the opposite direction. The average distance Wo (= 12 μm) is approximately equal to the range of light leakage caused by the alignment failure of the liquid crystal molecules 12 due to the electric field distribution at the end of the pixel electrode PE adjacent to the gap and the protrusion. On the other hand, the average distance Wi (= 6 μm) is substantially equal to the range of light leakage caused by the alignment failure of the liquid crystal molecules due to the electric field distribution at the end of the pixel electrode PE adjacent to the gap.

  In the present embodiment, the light shielding stripes 2 are formed asymmetrically with respect to the pixel boundary BD so as to partially overlap the adjacent pixel electrodes PE arranged on both sides of the pixel boundary BD. That is, even when the color filter CF bulges the end portion of the adjacent pixel electrode PE along the pixel boundary BD, the alignment defect of the liquid crystal molecules 12 occurs on the first end side of the light shielding stripe 2 depending on the pretilt direction. The average distance Wi between the first end of the light-shielding stripe 2 and the pixel boundary BD is equal to the average distance Wo between the second end of the light-shielding stripe 2 and the pixel boundary BD because it does not occur due to the protrusion at the end of the pixel electrode PE. Is set shorter. Accordingly, the overall width of the light shielding stripe 2 is reduced while reliably preventing light leakage caused by the alignment failure of the liquid crystal molecules 12 due to the protrusion of the end of the pixel electrode PE on the second end side of the light shielding stripe 2. It becomes possible. In order to prevent light leakage caused by poor alignment of the liquid crystal molecules 12 corresponding to the rise of the color filter CF as in the prior art, the light shielding stripe 2 is symmetrical with respect to the pixel boundary BD with an average distance Wi = average distance Wo = 12 μm. When formed, the average total width of the light shielding stripes 2 is 24 μm. However, if the average distance Wi = 6 μm and the average distance Wo = 12 μm as described above, the average total width can be set to 18 μm and the area of the light shielding stripe 2 can be reduced as a whole. Accordingly, it is possible to surely prevent light leakage in the pixel without unnecessarily lowering the aperture ratio of the pixel, that is, display luminance.

  Next, a dot matrix type color liquid crystal display panel according to a second embodiment of the present invention will be described with reference to FIG. The structure of this color liquid crystal display panel is the same as that of the first embodiment except for the pixel electrode pattern. In FIG. 8, the same parts as those in the above-described embodiment are denoted by the same reference numerals.

  FIG. 8 conceptually shows a liquid crystal molecular arrangement generated in the liquid crystal layer LQ of the color liquid crystal display panel when a voltage is applied. In this color liquid crystal display panel, the average distance wi between the pixel electrode PE on the first end side of the light shielding stripe 2 that is the signal line X of the pair of adjacent pixel electrodes PE and the pixel boundary BD is set to 3 μm. The average distance wo between the pixel electrode PE on the second end side of the stripe 2 and the pixel boundary BD is set to 9 μm. Here, the overlapping width between the pair of adjacent pixel electrodes PE and the light shielding stripes 2 is 3 μm.

  In the present embodiment, similarly to the first embodiment, a region where the liquid crystal molecules 12 are oriented in the direction opposite to the pretilt azimuth T at the interface of the alignment film 4 and is not tilted sufficiently perpendicularly can be shielded from light. Further, since the total width of the light shielding stripes 2, that is, the signal lines X is 18 μm as in the above-described embodiment, there is no difference in the aperture ratio of the display pixels. In the present embodiment, the overlap width between the signal line X and the pixel electrode PE is small as can be seen from the comparison with FIG. Accordingly, the parasitic capacitance between the signal line X and the pixel electrode PE is smaller than that in the first embodiment, and the crosstalk phenomenon can be reduced.

[Production Example 1]
The color liquid crystal display panel of the first embodiment was actually manufactured as Manufacturing Example 1. In this manufacturing, the color display panel is set to the number of pixels with XGA resolution, and the thin film transistor and the electrode wiring are formed on the light-transmissive insulating substrate 3 by repeating film formation and patterning in a normal process. Next, an ultraviolet curable acrylic resin resist (CG-2000, manufactured by Fuji Film Ohlin Co., Ltd.) in which a green pigment is dispersed is applied to the entire surface of the light-transmitting insulating substrate 3 with a spinner so as to cover the thin film transistor and the electrode wiring. The film is selectively exposed to light having a wavelength of 365 nm irradiated through a photomask at an energy density of 100 mJ / cm ² . After this exposure, the acrylic resin resist is developed with a 1% aqueous solution of KOH for 20 seconds. At this time, the exposed portion of the acrylic resin resist is left as a colored layer G having a thickness of 3.2 μm. In the colored layer G, a through hole for wiring is formed. Subsequently, an ultraviolet curable acrylic resin resist (CR-2000: manufactured by Fuji Film Orin Co., Ltd.) in which a red pigment is dispersed similarly covers the thin film transistor and the electrode wiring, and the entire surface of the light transmissive insulating substrate 3 with a spinner. The film is selectively exposed to light having a wavelength of 365 nm that is applied and irradiated through a photomask at an energy density of 100 mJ / cm ² . After this exposure, the acrylic resin resist is developed with a 1% aqueous solution of KOH for 20 seconds. At this time, the exposed portion of the acrylic resin resist is left as a colored layer R having a thickness of 3.2 μm that partially overlaps the colored layer G. A through hole for wiring is formed in the colored layer R. Subsequently, an ultraviolet curable acrylic resin resist (CB-2000: manufactured by Fuji Film Orin Co., Ltd.) in which a blue pigment is dispersed similarly covers the thin film transistor and the electrode wiring, and the entire surface of the light transmissive insulating substrate 3 with a spinner. The film is selectively exposed to light having a wavelength of 365 nm that is applied and irradiated through a photomask at an energy density of 100 mJ / cm ² . After this exposure, the acrylic resin resist is developed with a 1% aqueous solution of KOH for 20 seconds. At this time, the exposed portion of the acrylic resin resist is left as a colored layer B having a thickness of 3.2 μm that partially overlaps the colored layers G and R. A through hole for wiring is formed in the colored layer B. Thereafter, an ITO film is formed as a pixel electrode PE with a thickness of 1500 mm by sputtering and patterned by photolithography. Further, a resin film is formed to cover the pixel electrode array, and is patterned as a photolithography method so as to remain as a frame disposed outside the pixel electrode array and a spacer disposed in the non-modulation part in the pixel electrode array. It is. The array substrate AR is formed as described above.

  When the array substrate AR and the counter substrate CT are formed, an alignment film material (AI-3046: manufactured by JSR Corporation) is applied as an alignment film 4 and 6 on the entire surface of these substrates AR and CT with a thickness of 600 mm. . Thereafter, in the counter substrate CT, the outer edge seal member, that is, the adhesive of the substrates AR and CT is printed along the periphery of the alignment film 6 so as to leave the liquid crystal injection port, and the electrode transfer material is shared from the array substrate AR side. In order to apply the potential VCOM, it is formed on the common electrode CE exposed as an electrode transition electrode outside the outer edge seal member. Next, the array substrate AR and the counter substrate CT are brought into close contact with the alignment films 4 and 6 inside, and are bonded together by heating in this state to cure the adhesive. Next, a liquid crystal composition (ZLI-1565: manufactured by MERCK) is injected from the liquid crystal injection port by an ordinary method, and then the liquid crystal injection port is sealed with an ultraviolet curable resin.

  After the array substrate AR and the counter substrate CT are integrated so as to sandwich the liquid crystal layer LQ in this way, a pair of polarizing plates PL are arranged so as to be crossed Nicols on the surface opposite to the liquid crystal layer LQ. The contrast characteristics were measured in a state where a drive voltage of 4 V was applied to the liquid crystal layer LQ via the pixel switching element 1. As a result, a high value of 500: 1 was obtained. Further, when the contrast viewing angle characteristics were measured, a visual field having a contrast ratio of 10: 1 or more obtained a wide value of ± 30 ° in the left and right directions, 15 ° in the upper direction, and 40 ° in the lower direction. Further, when the transmittance was measured in a state where no voltage was applied, a high value of 10% was obtained.

[Production Example 2]
The color liquid crystal display panel of the second embodiment was actually manufactured as Manufacturing Example 2 using the same manufacturing process as in Manufacturing Example 1. After the array substrate AR and the counter substrate CT are integrated, the pair of polarizing plates PL are similarly arranged so as to be crossed Nicols, and the contrast is applied with the driving voltage of 4V applied to the liquid crystal layer LQ via the pixel switching element 1. Characteristics were measured. As a result, a high value of 500: 1 was obtained. Further, when the contrast viewing angle characteristics were measured, a visual field having a contrast ratio of 10: 1 or more obtained a wide value of ± 30 ° in the left and right directions, 15 ° in the upper direction, and 40 ° in the lower direction. Further, when the transmittance was measured in a state where no voltage was applied, a high value of 10% was obtained. Further, as a result of observing a display image such as a block pattern, crosstalk was improved as compared with Production Example 1.

[Comparative Example 1]
As a comparative example 1, the conventional color liquid crystal display panel shown in FIGS. 9 and 10 was actually manufactured using the same manufacturing process as in manufacturing example 1. In Comparative Example 1, the light shielding stripes 2 are formed symmetrically with respect to the pixel boundary BD at an average distance Wi = 6 μm and an average distance Wo = 6 μm. After the array substrate AR and the counter substrate CT are integrated, the pair of polarizing plates PL are similarly arranged so as to be crossed Nicols, and the contrast is applied with the driving voltage of 4V applied to the liquid crystal layer LQ via the pixel switching element 1. Characteristics were measured. As a result, the value was 50: 1, which was much lower than Production Example 1. This is because light leakage occurs in the misalignment region F shown in FIG. Here, the traveling direction of light is indicated by an arrow. Further, when the contrast viewing angle characteristic was measured, the field of view with a contrast ratio of 10: 1 or more had only ± 5 ° in the left and right directions. This is also for the reason described above.

[Comparative Example 2]
As Comparative Example 2, the conventional color liquid crystal display panel shown in FIGS. 11 and 12 was actually manufactured using the same manufacturing process as in Manufacturing Example 1. In Comparative Example 2, the light shielding stripes 2 are formed symmetrically with respect to the pixel boundary BD at an average distance Wi = 12 μm and an average distance Wo = 12 μm. After the array substrate AR and the counter substrate CT are integrated, the pair of polarizing plates PL are similarly arranged so as to be crossed Nicols, and the contrast is applied with the driving voltage of 4V applied to the liquid crystal layer LQ via the pixel switching element 1. Characteristics were measured. As a result, a high value of 500: 1 was obtained. When the contrast viewing angle characteristics were measured, a visual field with a contrast ratio of 10: 1 or more obtained a wide range of ± 30 ° in the left and right directions, 15 ° in the upper direction, and 40 ° in the lower direction. When the transmittance was measured in the added state, it was 8%, which was lower than Production Example 1 and Production Example 2. This is because the width of the signal line X is larger than those in Manufacturing Example 1 and Manufacturing Example 2.

  In addition, this invention is not limited to the above-mentioned embodiment, It can deform | transform variously in the range which does not deviate from the summary.

  In the first embodiment, the colored layers R, G, and B of the color filter CF are formed in a stripe shape. If the delta arrangement is adopted as the pixel electrode array, the colored layers R, G, and B are formed so as to overlap each other in a shape that is divided so as to be the base of three adjacent pixel electrodes PE arranged in the delta arrangement. Will be. In this case, it is preferable that not only the signal line X but also the scanning line Y or the auxiliary capacitance line S are light-shielding stripes asymmetric with respect to the pixel boundary.

It is a figure which shows the external appearance of the color liquid crystal display panel which concerns on 1st Embodiment of this invention. It is a figure which shows the circuit structure of the color liquid crystal display panel shown in FIG. It is a figure which shows the black matrix of the color liquid crystal display panel shown in FIG. It is a figure which shows the cross-section of a color display panel along the IV-IV line | wire shown in FIG. It is a figure which shows the rubbing direction of the alignment film shown in FIG. It is a figure which shows the plane pattern of the light shielding stripe shown in FIG. It is a figure which shows the relationship between the light shielding stripe shown in FIG. 4, and the orientation state of the liquid crystal molecule obtained at the time of a voltage application. It is a figure which shows the relationship between the light-shielding stripe of the color liquid crystal display panel which concerns on 2nd Embodiment of this invention, and the orientation state of the liquid crystal molecule obtained at the time of a voltage application. It is a figure which shows the cross-section of the comparative example 1 which is a conventional color liquid crystal display panel. It is a figure which shows the relationship between the light shielding stripe of the comparative example 1 shown in FIG. 9, and the orientation state of the liquid crystal molecule obtained at the time of a voltage application. It is a figure which shows the cross-section of the comparative example 2 which is the conventional color liquid crystal display panel. It is a figure which shows the relationship between the light shielding stripe of the comparative example 2 shown in FIG. 11, and the orientation state of the liquid crystal molecule obtained at the time of a voltage application.

Explanation of symbols

  AR ... array substrate, BD ... pixel boundary, BM ... black matrix, CT ... counter substrate, LQ ... liquid crystal layer, CE ... common electrode, CF ... color filter, PE ... pixel electrode, RB ... rubbing orientation, S ... auxiliary capacitance line , T ... pretilt azimuth, X ... signal line, Y ... scanning line, R ... red colored layer, G ... green colored layer, B ... blue colored layer, 2 ... light shielding stripe, 4, 6 ... alignment film, 12, 12a- 12e: Liquid crystal molecules.

Claims (6)

A plurality of pixel electrodes that are adjacent to each other across a linear pixel boundary and are arranged in the pixel array direction orthogonal to the pixel boundary, a light shielding layer that shields at least the gap between the pixel electrodes, and a base of the pixel electrodes A first electrode substrate including a color filter covering the light shielding layer, a second electrode substrate including a common electrode facing the plurality of pixel electrodes, and an orientation direction of liquid crystal molecules on the first electrode substrate A liquid crystal layer including a liquid crystal composition specified not to be parallel to the first and second electrode substrates, and the light-shielding layer is disposed along the pixel boundary and is paired in the pixel array direction. A light-shielding stripe that partially overlaps the adjacent pixel electrode, and the light-shielding stripe has first and second ends on both sides of the pixel boundary, and the first end has an orientation direction of the liquid crystal molecules. In the pixel array direction, it is disposed on one side having an angle larger than 90 ° with respect to a vector from the pixel boundary toward the first end, and the second end has an orientation direction of the liquid crystal molecules in the pixel array direction. It is arranged on the other side having an angle smaller than 90 ° with respect to the vector from the pixel boundary toward the second end, and an average distance between the first end and the pixel boundary is the second end and the pixel boundary. A liquid crystal display panel, characterized in that it is set shorter than the average distance. Among the pair of adjacent pixel electrodes, the average distance between the pixel electrode overlapping the first end and the pixel boundary is the average of the pixel electrode overlapping the second end of the pair of adjacent pixel electrodes and the pixel boundary. The liquid crystal display panel according to claim 1, wherein the liquid crystal display panel is set shorter than the distance. 2. The liquid crystal display panel according to claim 1, wherein the color filter includes a plurality of colored layers colored in a predetermined type of color, and the two types of colored layers overlap each other along the pixel boundary. The liquid crystal display panel according to claim 1, wherein the liquid crystal composition is a nematic liquid crystal in which liquid crystal molecules are twisted and arranged between the electrode substrates. The liquid crystal display panel according to claim 1, wherein the plurality of pixel electrodes are also arranged in a direction orthogonal to the pixel array direction. The liquid crystal display panel according to claim 1, wherein the light shielding stripe is made of a light shielding conductive member formed as a wiring for the plurality of pixel electrodes.

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