JP2004046123A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device which permits narrowing of the width of black matrices and has a high apparatus ratio. <P>SOLUTION: A first substrate of the liquid crystal display device is provided with gate wiring 1, source wiring 2 which intersects with the gate wiring 1, liquid crystal driving electrodes 5 which consist of a plurality of approximately parallel electrodes connected to switching elements connected to the source wiring 2 and comb-shaped common electrodes 6 which are arranged approximately parallel to the electrodes 5 and are arranged alternately and a second substrate is provided with colored layers 10 arranged in an array form and BMs 9 disposed between the colored layers. Spacers 8 between the substrates come into contact with the first substrate in regions where the gate wiring 1, the electrodes 5 and the electrodes 6 come into proximity with each other. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a liquid crystal display device, and more particularly to an improvement in luminance, a reduction in power consumption, and a reduction in cost due to a high aperture ratio.
[0002]
[Prior art]
In a liquid crystal display device, electrodes for driving a liquid crystal layer are formed of two substrates, a thin film transistor array substrate (hereinafter, referred to as a TFT substrate) and a color filter substrate (hereinafter, referred to as a CF substrate), and are opposed to each other. A transparent substrate is used. On the TFT substrate, switching elements and liquid crystal drive electrodes connected to the switching elements are formed in an array. In the CF substrate, pixels composed of RGB colored layers and a black matrix (hereinafter, referred to as BM) arranged between the colored layers are formed so as to correspond to each switching element. During this time, a liquid crystal material is injected, and display is performed by the polarization action of the liquid crystal material. The direction of the electric field applied to the liquid crystal is set to a direction substantially perpendicular to the substrate interface, and a twisted nematic display method (TN method), which operates by vertically orienting liquid crystal molecules that have been horizontally oriented by an electric field, is used. Conventionally, the liquid crystal driving method has been mainly adopted.
[0003]
However, this method has a problem in that when the liquid crystal molecules are vertically oriented by an electric field, they have a certain angle with respect to the substrate, so that the brightness varies depending on the viewing direction and the viewing angle cannot be widened.
[0004]
As a remedy, the direction of the electric field applied to the liquid crystal is set to a direction substantially parallel to the substrate interface, and a method of rotating the liquid crystal molecules in the horizontal direction by the electric field uses a comb-shaped electrode pair composed of a plurality of electrodes. 2. Description of the Related Art A liquid crystal display device of a lateral electric field method (In-Plane-Switching method, hereinafter referred to as an IPS method) has been used.
[0005]
Since the liquid crystal display device of the IPS mode has liquid crystal molecules always parallel to the substrate, it has a much wider viewing angle than that of the liquid crystal display device of the twisted nematic display mode, and is attracting attention as a liquid crystal display device for monitor use.
[0006]
In addition, in order to prevent leakage of liquid crystal, the liquid crystal panel is applied with an adhesive called a sealing material around the CF substrate and bonded to the TFT substrate. A certain gap for injecting a liquid crystal material is provided between the two opposing substrates. It is difficult to make the gap between the two substrates opposed to each other uniform, and there is some variation depending on the location, and luminance and chromaticity change, thereby causing display unevenness. In general, in the IPS system, since the change in luminance and chromaticity with respect to the gap is larger than that in the twisted nematic display system, in-plane uniformity of the gap is required.
[0007]
In order to keep this gap constant, a large number of spacers are usually provided between the substrates over the entire surface. This spacer is usually formed on a CF substrate in a structure as shown in FIG. Here, 8 is a spacer, 9 is a BM which is a light shielding layer, 10 is a colored layer which is an RGB pixel, and 13 is an overcoat film for flattening the CF surface.
[0008]
In the conventional liquid crystal display device, when the CF substrate and the TFT substrate are overlapped, the spacer 8 is arranged at the position shown in FIGS. 10 and 11 on the TFT substrate. Here, 1 is a gate wiring, 2 is a source wiring, 3 is a source electrode, and 4 is a drain electrode, and these constitute a switching element of the TFT. Further, 5 is a liquid crystal drive electrode connected to the drain electrode 4, 6 is a common electrode facing the liquid crystal drive electrode 5, and 7 is a common capacitance line connected to the common electrode 6. The liquid crystal material is oriented by the electric field between the liquid crystal drive electrode 5 and the common electrode 6. In the IPS system, since an electric field is applied in the horizontal direction, the liquid crystal driving electrode 5 and the common electrode 6 are in a comb shape. The BM 9 on the CF substrate is provided at a position shown by a thick line in FIG. 10 and FIG. 11 (a position corresponding to the gate wiring 1 and the source wiring 2) to shield light between pixels. Here, FIGS. 10 and 11 are enlarged views of one pixel, and the pixels are provided in an array.
[0009]
[Problems to be solved by the invention]
Assuming the arrangement shown in FIG. 10, the spacer 8 is in contact with the TFT substrate on the source wiring 3. Usually, the diameter of the spacer 8 is about 10 to 20 μm. Further, since the pixels are provided in an array, the line width e of the BM 9 at this position is the sum of c and d shown in FIG.
[0010]
In order to maintain a stable cell gap (gap between substrates), it is necessary to install the spacer 8 so that the height of the spacer 8 does not vary. Therefore, when the substrates are opposed to each other, it is necessary to arrange the spacers 8 and the colored layer 10 so that they do not overlap and do not protrude from the BM 9. Further, in order to prevent color omission and to improve panel display quality, it is necessary to overlap the BM 9 with the colored layer 10. However, it is necessary to secure a BM9 space of about 10 to 15 μm on one side based on the width accuracy of the spacer 8 and the position accuracy of the BM 9, the width accuracy of the BM 9, and the width accuracy of the colored layer 10 and the position accuracy of the BM 9. Therefore, the aperture ratio was reduced, and the luminance was reduced. Therefore, there is a problem that low power consumption and low cost of the backlight of the liquid crystal display device cannot be realized.
[0011]
Assuming the arrangement shown in FIG. 11, the spacer 8 is in contact with the TFT substrate on the gate wiring 1. The line width e of the BM 9 at this position is the sum of a and b shown in FIG. 11, and is about 30 μm.
[0012]
However, also in this case, it is necessary to further increase the BM width (about 35 to 45 μm) in order to provide the spacer 8 so that gap unevenness does not occur. Therefore, the aperture ratio was reduced, and the luminance was reduced. Therefore, there is a problem that low power consumption and low cost of the backlight of the liquid crystal display device cannot be realized.
[0013]
Further, in the conventional TFT substrate shown in FIGS. 10 and 11, when the width of the gate wiring 1, the source wiring 2, and the BM 9 is reduced to improve the aperture ratio, the BM around the spacer 8 cannot be reduced. There was a problem that it hindered the rate improvement.
[0014]
The present invention has been made to solve such a problem, and has as its object to provide a liquid crystal display device having a high aperture ratio and high luminance.
[0015]
[Means for Solving the Problems]
The liquid crystal display device according to the present invention includes a first substrate and a second substrate which are opposed to each other, a spacer (for example, a spacer 8 in the embodiment of the present invention) which keeps the distance between the substrates substantially constant, and A liquid crystal display device comprising a liquid crystal layer sandwiched between the first and second substrates, wherein the first substrate has a gate wiring (for example, the gate wiring 1 in the embodiment of the present invention) and the gate wiring and an insulating film interposed therebetween. Intersecting source wiring (for example, source wiring 2 in the embodiment of the present invention), a switching element connected to the source wiring, and a liquid crystal drive electrode connected to the switching element and including a plurality of substantially parallel electrodes (For example, a liquid crystal drive electrode 5 in the embodiment of the present invention) and a comb-like common electrode composed of a plurality of electrodes arranged substantially in parallel and alternately with the liquid crystal drive electrode, for example, The second substrate is provided between the coloring layer (for example, the coloring layer 10 in the embodiment of the present invention) and the coloring layer arranged in an array. A light-shielding layer (for example, BM9 in the embodiment of the present invention) provided, and when the first substrate and the second substrate are arranged to face each other, the spacer serves as the gate wiring and the liquid crystal drive electrode. And contacting the first substrate in a region where the common electrode is close to the first substrate. As a result, the aperture ratio can be improved, and the luminance can be improved.
[0016]
A liquid crystal display device according to the present invention includes a first substrate and a second substrate opposed to each other, a spacer for keeping the distance between the substrates substantially constant, and a liquid crystal layer sandwiched therebetween. Wherein the first substrate is connected to a gate wiring, a source wiring crossing the gate wiring via an insulating film, a switching element connected to the source wiring, and a plurality of switching elements connected to the switching element. A liquid crystal driving electrode comprising substantially parallel electrodes; and a comb-like common electrode comprising a plurality of electrodes arranged substantially in parallel and alternately with the liquid crystal driving electrodes, and the second substrate is arranged in an array. A colored layer, and a light shielding layer provided between the colored layers, and when the first substrate and the second substrate are arranged to face each other, the spacer includes the source wiring, the liquid crystal driving electrode, and The common electrode It is characterized in that the contact with the first substrate in proximity to the region. As a result, the aperture ratio can be improved, and the luminance can be improved.
[0017]
A liquid crystal display device according to the present invention includes a first substrate and a second substrate disposed to face each other, a spacer for keeping a distance between the substrates substantially constant, and a liquid crystal layer sandwiched therebetween. Wherein the first substrate includes a gate wiring, and a source wiring intersecting the gate wiring via an insulating film, and the second substrate includes a colored layer arranged in an array, A light-shielding layer provided between the first substrate and the second substrate. When the first substrate and the second substrate are arranged to face each other, the spacer comes into contact with one substrate near an intersection of the gate line and the source line. It is characterized by doing.
As a result, the aperture ratio can be improved, and the luminance can be improved.
[0018]
A liquid crystal display device according to the present invention includes a first substrate and a second substrate opposed to each other, a spacer for keeping the distance between the substrates substantially constant, and a liquid crystal layer sandwiched therebetween. Wherein the first substrate includes a gate wiring, a source wiring intersecting the gate wiring via an insulating film, a switching element connected to the source wiring, and a liquid crystal drive electrode connected to the switching element. A common electrode provided to face the liquid crystal drive electrode; and a common capacitor line provided substantially parallel to the gate line and connected to the common electrode (for example, common capacitor line 7 in the embodiment of the present invention). Wherein the second substrate comprises a colored layer arranged in an array and a light-shielding layer provided between the colored layers, wherein the first substrate and the second substrate are arranged to face each other. In addition, Sa is characterized in that in contact with the first substrate at the intersection near the common capacitor wiring and the source wiring. As a result, the aperture ratio can be improved, and the luminance can be improved.
[0019]
It is preferable that the spacer is provided on the light shielding layer. As a result, the aperture ratio can be improved, and the luminance can be improved.
[0020]
A liquid crystal display device according to the present invention includes a first substrate and a second substrate opposed to each other, a spacer for keeping the distance between the substrates substantially constant, and a liquid crystal layer sandwiched therebetween. Wherein the first substrate includes a gate wiring, a source wiring intersecting the gate wiring via an insulating film, a switching element connected to the source wiring, and a liquid crystal drive electrode connected to the switching element. A common electrode provided to face the liquid crystal drive electrode; and a common capacitance line provided substantially in parallel with the gate line and connected to the common electrode, wherein the second substrate is arranged in an array. A colored layer and a light-shielding layer provided between the colored layers, and when the first substrate and the second substrate are arranged to face each other, the spacer is disposed on the common capacitance wiring in a first position. Contacts the substrate, One is characterized in that said contact with the second substrate on the colored layer. As a result, the aperture ratio can be improved, and the luminance can be improved.
[0021]
Preferably, the spacer is provided on the coloring layer. As a result, the aperture ratio can be improved, and the luminance can be improved.
[0022]
Further, the spacer may be provided on the first substrate. As a result, the aperture ratio can be improved, and the luminance can be improved.
[0023]
The shape of the spacer may be columnar. As a result, the aperture ratio can be improved, and the luminance can be improved.
[0024]
The present invention is preferably used for a liquid crystal display device of a horizontal electric field system.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
First Embodiment of the Invention
In the liquid crystal display device according to the present invention, similarly to the conventional liquid crystal display device, a TFT substrate and a CF substrate are arranged to face each other, and a liquid crystal material is held between the substrates. FIG. 1 shows a structure of a pixel portion of the liquid crystal display device. FIG. 1 shows a configuration of one pixel on a TFT substrate. 1 is a gate wiring, 2 is a source wiring, 3 is a source electrode, 4 is a drain electrode, 5 is a liquid crystal drive electrode, 6 is a common electrode, 7 is a common capacitance wiring, 8 is a spacer, and 9 is a BM.
[0026]
Next, a manufacturing process of the TFT substrate will be described. First, a conductive film of Al, Cr, Mo, Ti, W, or the like is formed on an insulating substrate by a sputtering apparatus. Then, the gate wiring 1 and the common capacitance wiring 7 are formed by a photolithography process, an etching process, and a resist removing process.
[0027]
Next, SiN is formed on the insulating substrate on which the gate wiring 1 and the common capacitance wiring 7 are formed. _x And the like and an a-Si semiconductor film are formed by a plasma CVD apparatus. Here, the surface of the semiconductor film is doped with impurities such as P and As to form an ohmic layer of n. ⁺ An a-Si layer is formed. Then, a semiconductor layer is formed by a photolithography process, an etching process, and a resist removal process.
[0028]
Further, in order to form the drain electrode 2, the source electrode 3, and the source wiring 5 thereon, a conductive film such as Al, Cr, Mo, Ti, and W is formed by a sputtering apparatus. Then, a drain electrode 2, a source electrode 3, and a source wiring 2 are formed by a photolithography process, an etching process, and a resist removal process.
[0029]
After this, SiN which is an interlayer insulating film is formed. _x A film is formed, and a contact hole is formed by a photolithography process, a resist removal process, and an etching process. Then, a transparent conductive film such as an ITO film is formed. The photolithography process, the etching process, and the resist removal process result in a structure in which the liquid crystal drive electrode 4 and the common electrode 6 face in a comb shape. Further, the structure is such that the drain electrode 4 and the liquid crystal driving electrode 5 and the common electrode 6 and the common capacitance wiring 7 are in contact with each other through the contact hole. TFTs are formed by the above-described steps, and a TFT substrate provided with the TFTs in an array is used for a liquid crystal display device.
[0030]
In the lateral electric field type TFT substrate, the liquid crystal drive electrode 4 and the common electrode 6 may be formed of a metal film such as Cr, Al, Mo, Ti, W, or the like. Is also good. Further, the liquid crystal drive electrode 4 or the common electrode 6 may be formed in the same step as the drain electrode 3.
[0031]
Further, the TFT substrate is washed and an alignment film is applied. Thereafter, firing and rubbing are performed. Here, a rubbing process was performed in a direction substantially parallel to the source wiring 2. Thus, when the TFT is in the OFF state, the liquid crystal molecules are oriented in a direction substantially parallel to the source wiring 2.
[0032]
Next, a manufacturing process of the CF will be described with reference to FIG. First, a Cr film is formed on an insulating substrate by a sputtering device. Then, BM9 which is a light shielding layer is formed by a photoengraving process or the like. Here, the Cr film is formed by a sputtering method, but may be a two-layer film of metal Cr and Cr oxide, or may be another film type such as Ni or Al. The film formation method is not limited to the sputtering method, but may be another film formation method such as an evaporation method. Further, a resin black matrix in which a light shielding agent is dispersed in a resin may be used.
[0033]
From above, the R pigment is applied on the substrate. After that, the pigment is patterned by a resist application, exposure and development process to form an R colored layer 10a between the BMs 9. This is repeated for the G colored layer 10b and the B colored layer 10c to form the three primary color layers 10. Here, the colored layer 10 and the BM 9 are overlapped so that light does not leak. In this embodiment, the pigment method is used. However, the present invention is not limited thereto, and any of a dyeing method, an electrodeposition method, and a printing method may be used.
[0034]
A transparent overcoat film 13 is applied from above and flattened. Further, an alignment film 11 is formed thereon. Then, baking and rubbing are performed in the same manner as the alignment film of the TFT substrate. Here, rubbing was performed in a direction substantially parallel to the source wiring 2. Therefore, when the TFT is in the OFF state, the liquid crystal molecules are aligned in a direction substantially parallel to the source wiring 2. The overcoat film 13 has heat resistance and chemical resistance, and also has a role of protecting the coloring layer 10. Here, the overcoat film 13 and the alignment film 11 are different films, but the overcoat film 13 and the alignment film 11 may be formed of the same film.
[0035]
Then, a spacer 8 for forming a gap for injecting a liquid crystal material between the TFT substrate and the CF substrate is formed. The spacer 8 is formed by a photo process after applying a resin layer. Here, the spacer 8 is formed in a tapered columnar shape as shown in FIG. 8, and has a substantially circular cross section. The diameter of the root (contact surface on the CF substrate side) is about 15 μm. Normally, the larger the area is, the more advantageous the in-plane uniformity of the gap is, but the overlap with the colored layer 10 and the protrusion from the BM 9 impairs the in-plane uniformity of the gap between the substrates, so that it is necessary to secure the BM width. This leads to a decrease in aperture ratio.
[0036]
The TFT substrate and the CF substrate formed in this way are bonded with a sealant, and a liquid crystal material is injected. A liquid crystal panel is formed by the steps described above. Here, the BM 9 is arranged in a region surrounded by a thick line in FIG.
[0037]
Next, the state of liquid crystal molecules in a region on the TFT substrate where the gate wiring 1, the liquid crystal driving electrode 5, and the common electrode 6 are close to each other will be described with reference to FIG. FIG. 2 is an enlarged view of a region A indicated by a dotted line in FIG. 1 are the same as those shown in FIG. 1 and will not be described. Here, reference numeral 12 denotes liquid crystal molecules held between the TFT substrate and the CF substrate, and the dotted lines indicate lines of electric force when voltage is applied only to the gate wiring 1.
[0038]
Here, as shown in FIG. 2, the alignment film 11 was rubbed in a direction substantially perpendicular to the gate wiring 1. Since no voltage is applied to the liquid crystal drive electrode 5 when the TFT is off, the potential difference between the liquid crystal drive electrode 5 and the common electrode 6 approaches zero. Therefore, the liquid crystal molecules 12 are aligned in the same direction as the rubbing direction, and block the backlight. Accordingly, a normally black mode IPS liquid crystal display device is obtained.
[0039]
At the time of driving the liquid crystal, the gate voltage fluctuates and a potential difference is generated in the vicinity of the gate wiring 1, and the electric lines of force are in the same direction as the rubbing direction as indicated by the dotted line. In regions other than the light leakage region C near the gate line 1, the liquid crystal drive electrode 5 and the gate line 1 and the common electrode 6 and the gate line 1 are substantially parallel. Therefore, the lines of electric force during this period are substantially perpendicular to the gate wiring 1. Therefore, the liquid crystal molecules 12 are oriented in the rubbing direction, and the backlight is blocked.
[0040]
However, in the light leakage region C surrounded by the dotted line in FIG. 2, the direction of the electric force line is different from the rubbing direction as shown in FIG. Accordingly, the liquid crystal molecules 12 tilt, causing light leakage. To maintain the contrast, the BM 9 for shielding light in the light leakage area C is required. In this region, light leakage occurs at the time of black display, and becomes an abnormal alignment region requiring light shielding.
[0041]
In the present embodiment, the spacer 8 is arranged at this position. The line width e of the BM 9 on the gate wiring 1 outside this region is the sum of a and b shown in FIG. 1 and is about 30 μm. Therefore, the spacer 8 protrudes from the BM 9 or overlaps with the colored layer 10 due to the width accuracy of the spacer 8 and the positional accuracy with respect to the BM 9 during the formation of the CF substrate, the width accuracy of the BM 9, and the width accuracy of the colored layer 10 and the positional accuracy with respect to the BM 9. Therefore, the in-plane uniformity of the cell gap is impaired.
[0042]
In a region where the gate line 1, the liquid crystal drive electrode 5, and the common electrode 6 are close to each other, the light leakage region C is shielded from light, and therefore, the BM 9 has a width larger than that. Therefore, by disposing the spacer 8 here, it is possible to prevent the spacer 8 from protruding from the BM 9 and overlapping with the colored layer 10. Further, the wiring width and the BM width other than the abnormal alignment region can be reduced, and the BM area can be reduced. As a result, a high aperture ratio can be realized, and improvement in luminance can be expected. Further, power saving and cost reduction of the backlight can be achieved.
[0043]
As described above, in the first embodiment, a spacer is provided in a region where the gate wiring 1, the liquid crystal drive electrode 5, and the common electrode 6 are in proximity to each other due to light leakage, and in which the liquid crystal driving electrode 5 and the common electrode 6 are close to each other. The purpose is to improve the aperture ratio.
[0044]
Embodiment 2 of the present invention
A liquid crystal display device according to the present invention will be described with reference to FIGS. 1 and 2 are the same as those in FIGS. 1 and 2 and will not be described.
[0045]
FIG. 3 shows a configuration of a pixel portion of the liquid crystal display device according to the second embodiment. FIG. 4 is an enlarged view of a region B indicated by a dotted line in FIG. Also in the second embodiment, the method of manufacturing the TFT substrate and the CF substrate is the same as in the first embodiment. The rubbing direction is the same direction.
[0046]
As shown in FIG. 3, the position of the spacer 8 in the second embodiment is different from that in the first embodiment. Here, the spacer 8 is arranged in a region where the source wiring 2, the liquid crystal driving electrode 5, and the common capacitance wiring 6 are close to each other.
[0047]
The state of the liquid crystal molecules in this region will be described with reference to FIG. As described above, the rubbing process is performed on the alignment film 11 in a direction perpendicular to the gate line 1, that is, substantially parallel to the source line 2. Here, the source voltage fluctuates during liquid crystal driving. Therefore, when a voltage is applied only to the source line 2, electric lines of force near the source line 2 are as shown in FIG. Therefore, similarly to the first embodiment, the liquid crystal molecules 12 tilt, and light leakage occurs. Further, the lines of electric force between the liquid crystal drive electrode 5 and the source wiring 2 are substantially perpendicular to the rubbing direction. Therefore, as shown in FIG. 4, the liquid crystal molecules 12 are aligned perpendicular to the rubbing direction. Light leakage also occurs here. In this region, light leakage occurs at the time of black display, and becomes an abnormal alignment region requiring light shielding.
[0048]
For the above reason, light leakage occurs in the light leakage region D indicated by the dotted line in FIG. Therefore, in order to maintain the contrast, a BM 9 for shielding light is required in this area, and it is necessary to increase the BM width in this area D. Therefore, by disposing the spacer 8 here, it is possible to prevent the spacer 8 from protruding from the BM 9 and overlapping with the colored layer 10. Then, the wiring width and the BM width other than the abnormal alignment region can be reduced, and the BM area can be reduced. As a result, a high aperture ratio can be realized, and improvement in luminance can be expected. Further, power saving and cost reduction of the backlight can be achieved. In this case, it is necessary to increase the BM area around the region B.
[0049]
As described above, in the second embodiment, the spacer 8 is provided in the alignment abnormal region where the source wiring 2, the liquid crystal driving electrode 5, and the common capacitance wiring 6 in the pixel portion are close to each other, and the aperture ratio is improved.
[0050]
Embodiment 3 of the present invention.
Similar effects can be obtained by providing the spacers 8 in the abnormal alignment region where the width of the BM 9 other than the first and second embodiments needs to be increased. For example, the spacer 8 may be arranged near the intersection of the gate wiring 1 and the source wiring 2 shown in FIG. Here, the gate wiring 1, the source wiring 2, the common electrode 6, and the liquid crystal driving electrode 5 are close to each other. The electric field generated by these potential differences disrupts the alignment of the liquid crystal molecules and causes light leakage. Therefore, this region becomes an abnormal alignment region requiring light shielding, and the width of the BM 9 needs to be increased. By providing the spacer 8 in this region, the BM area can be reduced and a high aperture ratio can be realized. In this case, it is necessary to provide a wide BM around the TFT as shown in FIG.
[0051]
Further, the liquid crystal panel having the above arrangement can be used not only in the IPS mode but also in a conventional TN mode or other liquid crystal display device. As a result, the BM width can be reduced, and a higher aperture ratio can be expected.
[0052]
Embodiment 4 of the present invention.
Further, as shown in FIG. 6, the spacer 8 may be arranged near the intersection of the source wiring 2 and the common capacitance wiring 6. Here, since the source line 2 and the common capacitance line 6 intersect, the liquid crystal alignment is disturbed by lines of electric force generated by the potential difference between the two lines, and light leakage occurs. Therefore, the BM width in an area other than this area can be reduced. Thereby, the BM area can be reduced, and a high aperture ratio can be realized.
[0053]
Further, the liquid crystal panel having the above arrangement can be used not only in the IPS mode but also in a conventional TN mode or other liquid crystal display device. Thus, a higher aperture ratio can be expected by reducing the BM area.
[0054]
In the above-described first to fourth embodiments, the spacer 8 is disposed in an abnormal alignment region where light leakage occurs and the width of the BM needs to be increased. Thus, the BM width at a location other than the abnormal alignment region can be reduced, and the BM area can be reduced. Therefore, the luminance of the liquid crystal display device can be improved, and power saving and cost reduction of the backlight can be realized.
[0055]
Other embodiments.
Further, as shown in FIG. 7, a spacer 8 may be arranged on the common capacitance wiring 7. Here, the spacer 8 is provided not on the BM 9 but on the coloring layer 10 on the CF substrate. Since the common capacitance wiring 7 is formed of a metal film as described in Embodiment 1, the backlight is shielded. Therefore, the BM 9 as the light shielding layer is not required, and the spacer 8 can be arranged without deteriorating the display characteristics. Therefore, the BM area can be reduced without disposing the spacer 8 on the BM 9. In this case, it is desirable that the liquid crystal drive electrode 5 and the common electrode 6 be formed of a non-transparent conductive film such as a metal film. In this embodiment, as shown in FIG. 7, the area of the BM 9 near the gate wiring 1 can be reduced.
[0056]
Further, the liquid crystal panel having the above arrangement can be used not only in the IPS mode but also in a conventional TN mode or other liquid crystal display device. Similarly, a higher aperture ratio can be expected, and the luminance of the liquid crystal display device can be improved.
[0057]
The shape of the spacer 8 described above is not limited to a columnar shape, and may be a dome shape, a spherical shape, a columnar shape, or the like. Further, when the spacer 8 is provided in the abnormal orientation region, the diameter of the spacer 8 may be 15 μm or more according to the area of the abnormal orientation region. Thereby, the in-plane uniformity of the gap between the substrates is improved, and the display unevenness of luminance and chromaticity in the substrate surface can be suppressed. The cross section of the spacer 8 is not limited to a circle, but may be a polygon such as a triangle and a quadrangle. Further, the spacer 8 may be formed on the TFT substrate.
[0058]
The TFT array substrate according to the present invention is not limited to the film types and forming methods described in the manufacturing method described in Embodiment 1, but may be applied to other film types and forming methods as long as the arrangement of the spacers on the TFT is the same. Similar effects can be obtained. For example, in addition to Al, Cr, Mo, Ti, and W, the conductive film may be a metal such as Ni, Ag, Ta, or Cu, or an alloy containing these as a main component. Furthermore, the insulating film is SiN _x Not limited to SiO ₂ May be. The semiconductor layer 1 is not limited to the a-Si film (amorphous silicon) but may be a p-Si film (polysilicon). P and As doping to form an ohmic layer and n ⁺ An a-Si layer was formed. ⁺ An a-Si layer may be formed. The film formation method is not limited to the sputtering method and the plasma CVD method, but may be an evaporation method, a reduced pressure CVD method, or a normal pressure CVD method. The same effect can be obtained by these.
[0059]
【The invention's effect】
According to the present invention, the width of the black matrix can be reduced, and a liquid crystal display device having a high aperture ratio can be provided.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a pixel portion of a liquid crystal display device according to a first embodiment of the present invention.
FIG. 2 is an enlarged view of a region A in FIG.
FIG. 3 is a configuration diagram of a pixel unit of a liquid crystal display device according to a second embodiment of the present invention.
FIG. 4 is an enlarged view of a region B in FIG. 2;
FIG. 5 is a configuration diagram of a pixel unit of a liquid crystal display device according to a third embodiment of the present invention.
FIG. 6 is a configuration diagram of a pixel unit of a liquid crystal display device according to a fourth embodiment of the present invention.
FIG. 7 is a configuration diagram of a pixel portion of a liquid crystal display device according to another embodiment of the present invention.
FIG. 8 is a configuration diagram of a CF substrate of the liquid crystal display device according to the present invention.
FIG. 9 is a configuration diagram of a CF substrate.
FIG. 10 is a configuration diagram of a pixel portion of a conventional liquid crystal display device.
FIG. 11 is a configuration diagram of a pixel portion of a conventional liquid crystal display device.
[Explanation of symbols]
1 Gate wiring
2 Source wiring
3 Source electrode
4 Drain electrode
5 LCD drive electrode
6 Common electrode
7 Common capacitance wiring
8 Spacer
9 BM (black matrix)
10 Colored layer
10a R colored layer
10b G colored layer
10c B colored layer
11 Alignment film
12 Liquid crystal molecules
13 Overcoat film

Claims (10)

What is claimed is: 1. A liquid crystal display device comprising: a first substrate and a second substrate disposed opposite to each other; and a spacer that keeps a distance between the substrates substantially constant, and a liquid crystal layer sandwiched therebetween.
The first substrate has a gate wiring;
Source wiring crossing the gate wiring via an insulating film;
A switching element connected to the source wiring,
A liquid crystal drive electrode connected to the switching element and comprising a plurality of substantially parallel electrodes;
A common electrode consisting of a plurality of electrodes substantially parallel and alternately arranged with the liquid crystal drive electrode,
The second substrate includes a coloring layer arranged in an array and a light-blocking layer provided between the coloring layers,
When the first substrate and the second substrate are arranged to face each other, the spacer is in contact with the first substrate in a region where the gate wiring, the liquid crystal driving electrode, and the common electrode are close to each other. Liquid crystal display. A first substrate and a second substrate which are arranged to face each other;
A spacer for keeping the distance between the substrates substantially constant,
A liquid crystal display device comprising a liquid crystal layer sandwiched therebetween.
The first substrate has a gate wiring;
Source wiring crossing the gate wiring via an insulating film;
A switching element connected to the source wiring,
A liquid crystal drive electrode connected to the switching element and comprising a plurality of substantially parallel electrodes;
A common electrode consisting of a plurality of electrodes substantially parallel and alternately arranged with the liquid crystal drive electrode,
The second substrate includes a coloring layer arranged in an array,
A light-shielding layer provided between the coloring layers,
When the first substrate and the second substrate are arranged to face each other, the spacer is in contact with the first substrate in a region where the source wiring, the liquid crystal driving electrode, and the common electrode are close to each other. Liquid crystal display. A first substrate and a second substrate which are arranged to face each other;
A spacer for keeping the distance between the substrates substantially constant,
A liquid crystal display device comprising a liquid crystal layer sandwiched therebetween.
The first substrate has a gate wiring;
A source wiring crossing the gate wiring via an insulating film,
The second substrate includes a coloring layer arranged in an array,
A light-shielding layer provided between the coloring layers,
The liquid crystal display device, wherein when the first substrate and the second substrate are arranged to face each other, the spacer comes into contact with the first substrate near an intersection of the gate wiring and the source wiring. A first substrate and a second substrate which are arranged to face each other;
A spacer for keeping the distance between the substrates substantially constant,
A liquid crystal display device comprising a liquid crystal layer sandwiched therebetween.
The first substrate has a gate wiring;
Source wiring crossing the gate wiring via an insulating film;
A switching element connected to the source wiring,
A liquid crystal drive electrode connected to the switching element;
A common electrode provided to face the liquid crystal drive electrode,
A common capacitance line provided substantially parallel to the gate line and connected to the common electrode,
The second substrate includes a coloring layer arranged in an array,
A light-shielding layer provided between the coloring layers,
The liquid crystal display device, wherein when the first substrate and the second substrate are arranged to face each other, the spacer comes into contact with the first substrate near an intersection of the source wiring and the common capacitance wiring. The liquid crystal display device according to claim 1, wherein
The liquid crystal display device, wherein the spacer is provided on the light shielding layer. A first substrate and a second substrate which are arranged to face each other;
A spacer for keeping the distance between the substrates substantially constant,
A liquid crystal display device comprising a liquid crystal layer sandwiched therebetween.
The first substrate has a gate wiring;
Source wiring crossing the gate wiring via an insulating film;
A switching element connected to the source wiring,
A liquid crystal drive electrode connected to the switching element;
A common electrode provided to face the liquid crystal drive electrode,
A common capacitance line provided substantially parallel to the gate line and connected to the common electrode,
The second substrate includes a coloring layer arranged in an array,
A light-shielding layer provided between the coloring layers,
When the first substrate and the second substrate are arranged to face each other, the spacer contacts the first substrate on the common capacitance wiring and contacts the second substrate on the coloring layer. A liquid crystal display device characterized by the above-mentioned. The liquid crystal display device according to claim 6, wherein the spacer is provided on the coloring layer. 7. The liquid crystal display device according to claim 1, wherein the spacer is provided on the first substrate. 9. The liquid crystal display device according to claim 1, wherein the spacer has a columnar shape. 12. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is of a lateral electric field type.

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