WO2011104956A1 - 液晶表示パネルおよび液晶表示装置 - Google Patents
液晶表示パネルおよび液晶表示装置 Download PDFInfo
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- WO2011104956A1 WO2011104956A1 PCT/JP2010/070732 JP2010070732W WO2011104956A1 WO 2011104956 A1 WO2011104956 A1 WO 2011104956A1 JP 2010070732 W JP2010070732 W JP 2010070732W WO 2011104956 A1 WO2011104956 A1 WO 2011104956A1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
- G02F1/134336—Matrix
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133707—Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
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- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133742—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers for homeotropic alignment
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1339—Gaskets; Spacers; Sealing of cells
- G02F1/13394—Gaskets; Spacers; Sealing of cells spacers regularly patterned on the cell subtrate, e.g. walls, pillars
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
- G02F1/134345—Subdivided pixels, e.g. for grey scale or redundancy
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136227—Through-hole connection of the pixel electrode to the active element through an insulation layer
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
- G02F1/1393—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells
Definitions
- the present invention relates to a liquid crystal display panel and a liquid crystal display device, and more particularly to a liquid crystal display panel and a liquid crystal display device that can divide one picture element into a plurality of domains and align liquid crystal molecules in multiple directions.
- liquid crystal display devices which are rapidly spreading in place of cathode ray tubes (CRT), are widely used in TVs, monitors, mobile phones, etc., taking advantage of their energy-saving, thin, and lightweight features.
- CTR cathode ray tubes
- a battery having a limited capacity is used as a driving power source. Therefore, in order to increase the continuous driving time of the mobile device, the power consumption of the liquid crystal display device is further reduced. It is becoming important.
- a TN (Twisted Nematic) mode method using liquid crystal molecules having a positive dielectric anisotropy has been most commonly used.
- the image quality such as contrast and color tone of the TN mode type liquid crystal display device is remarkably inferior when the liquid crystal display device is viewed from the upper, lower, left and right oblique directions as compared to the front direction. is there.
- the liquid crystal display device of the TN mode method has a large viewing angle dependency of image quality, and is not suitable for applications in which viewing from other than the front direction is assumed.
- an IPS (In-Plane Switching) mode liquid crystal display device As such a liquid crystal display device in which the viewing angle dependency of image quality is improved, an IPS (In-Plane Switching) mode liquid crystal display device, an MVA (Multi-domain Vertical Alignment) mode liquid crystal display device, and the like are known. .
- IPS In-Plane Switching
- MVA Multi-domain Vertical Alignment
- the orientation of the liquid crystal molecules changes in a plane parallel to the substrate surface in accordance with the applied voltage.
- the liquid crystal molecules cannot be controlled on the two electrodes provided for controlling the liquid crystal molecules in a plane parallel to the substrate surface for each picture element, and a substantial aperture ratio.
- it causes a decrease in
- the MVA mode liquid crystal display device at least one of the pair of substrates sandwiching the liquid crystal layer, on the surface in contact with the liquid crystal layer, either a transparent electrode having protrusions or notches as orientation dividing means, Alternatively, a combination of these is provided, and thereby, in each picture element, regions in which the liquid crystal molecules are aligned are formed in different directions, and a wide viewing angle characteristic is realized.
- liquid crystal display devices have become higher in definition and the size of one picture element tends to be reduced.
- Such picture elements are further patterned to have protrusions and notches as orientation dividing means. Therefore, the effective aperture ratio of one picture element tends to be small.
- the alignment of liquid crystal molecules is disturbed at the edge part of the picture element, the black matrix formation region, the step part such as the contact hole part, and the effective aperture ratio of one picture element as described above is particularly small.
- the ratio of the region where the alignment disorder of the liquid crystal molecules occurs becomes large.
- the difference in the alignment of the liquid crystal molecules due to the fine pattern finish variation causes a difference in luminance for each picture element, which is visually recognized as rough, leading to a decrease in display quality of the liquid crystal display device. End up.
- a transparent electrode patterned so that the alignment of the liquid crystal molecules in the region where the alignment disorder of the liquid crystal molecules is more stabilized can be used, or the area where the roughness occurs is shielded from light. It is possible to do.
- Patent Document 1 describes a vertical alignment type liquid crystal display device including a pixel electrode having a shape in which three polygonal transparent electrode portions are connected in series.
- FIG. 12 is a diagram showing a schematic configuration of a pixel electrode in the vertical alignment type liquid crystal display device.
- the picture element electrode 348 has a shape in which three polygonal transparent electrode portions (hereinafter referred to as “sub picture element electrodes 348 u”) are connected.
- the electrode 348 is formed in the corresponding sub-pixel region 349 (in the hatched region).
- Each sub-pixel electrode 348u is formed in a polygonal shape in which the outer edge or outer periphery of the electrode is substantially equidistant from the center point in order to align liquid crystal molecules in a substantially radial manner on the sub-pixel electrode 348u.
- the pixel electrodes 348 are arranged in a matrix on an overlayer formed on an active matrix substrate (not shown), and each of the pixel electrodes 348 includes R (red), G (green), and B (blue). Are arranged so as to face the color filters 205R, 205G, and 205B formed in a substantially rectangular shape on the opposite substrate arranged to face the active matrix substrate.
- the pixel electrode 348 includes a wiring connected to a TFD (Thin Film Diode) 320, that is, a connection portion 348c.
- the connection portion 348c is made of the same material as the pixel electrode 348. It is made of ITO (Indium Tin Oxide) or the like.
- the connecting portion 348c extends from the outer periphery of the lowermost sub pixel electrode 348u in the sub pixel region 349 to the position of the contact hole 346.
- the pixel electrodes 348 belonging to the same column are commonly connected to one data line 314 via the TFD 320 at the position of the corresponding contact hole 346.
- each of the pixel electrodes 348 belonging to the same row is opposed to one scanning line 214 (wave line portion).
- the scanning line 214 is provided on the counter substrate, and an opening 214a is formed in the scanning line 214 at a position corresponding to the approximate center of each subpixel electrode 348u, and is opposed to the active matrix substrate.
- a voltage is applied between the substrate and the opening 214a and the sub-pixel electrode 348u, an oblique electric field is generated in that portion, and the tilt direction of the liquid crystal molecules is defined.
- the alignment state of the liquid crystal molecules can be controlled radially according to the magnitude of the voltage applied between the two substrates, and a region in which the liquid crystal molecules are radially aligned can be formed.
- the overlayer has a substantially circular opening in plan view, that is, a contact hole 346, and the connection portion 348c of the pixel electrode 348, the TFD 320, and the data line 314 are connected via the contact hole 346. Electrically connected.
- the liquid crystal molecules are aligned in the vertical direction, but the liquid crystal molecules positioned above the contact holes are Due to the influence of the inclined surface of the contact hole having a step, the alignment disorder of the liquid crystal occurs in that portion.
- the contact hole 346 is formed at or near the effective display region of the pixel electrode 348, that is, the position corresponding to the sub-pixel electrode 348u, the liquid crystal molecules generated in the contact hole 346 portion.
- the alignment disorder affects the liquid crystal molecules in the effective display area, and causes image quality problems such as display unevenness.
- the contact hole 346 is at a position that does not overlap with the pixel electrode 348 in the sub-pixel region 349, as illustrated. At the same time, it is formed in the picture element region, that is, in the sub picture element region 349 at a position farthest from the picture element electrode 348 (a corner position of the sub picture element region 349).
- the distance between the contact hole 346 and the sub-pixel electrode 348u serving as an effective display region can be as far as possible, so that the effective pixel corresponding to the position of the sub-pixel electrode 348u and the display portion is effective.
- the liquid crystal molecules in the display region are not easily affected by the alignment disorder of the liquid crystal molecules generated in the contact hole 346 portion.
- Japanese Patent Publication Japanese Patent Laid-Open No. 2005-338762 (published on December 8, 2005)”
- the contact hole is generally formed in a forward tapered shape in consideration of a later process.
- the contact hole has a forward tapered portion, that is, an inclined region.
- the contact hole including such an inclined region causes the alignment disorder of the liquid crystal molecules, but when shielding the region where the alignment disorder has occurred so as not to be visually recognized, the aperture ratio of the liquid crystal display panel and the liquid crystal display device It will cause a drop in transmittance.
- the present invention has been made in view of the above-described problems, and can display a high quality, a liquid crystal display panel having a high aperture ratio and a high transmittance, and a low power consumption while performing a high quality display.
- An object of the present invention is to provide a liquid crystal display device capable of performing display.
- a liquid crystal display panel of the present invention is sandwiched between a first insulating substrate, a second insulating substrate, and the first insulating substrate and the second insulating substrate.
- a liquid crystal display panel comprising a liquid crystal layer exhibiting negative dielectric anisotropy and a plurality of picture elements, wherein each of the plurality of picture elements includes a plurality of liquid crystal molecules in the liquid crystal layer.
- Projections and / or as orientation dividing means are provided on the surface of either one of the first insulating substrate and the second insulating substrate that is in contact with the liquid crystal layer so as to be aligned in different directions.
- a common electrode having a notch is formed, and a scanning signal line is formed on a surface of the other of the first insulating substrate and the second insulating substrate in contact with the liquid crystal layer, A data signal line and a picture element electrode are formed.
- the pixel electrode includes a drain electrode of an active element provided for controlling the pixel electrode and a through hole formed in the insulating layer.
- the pixel electrode is formed on the liquid crystal layer side of the insulating layer, and at least a part of the convex portion of the pixel electrode is a flat surface. It is characterized by being formed so as to overlap with the through hole.
- the through hole is generally formed in a forward taper shape in consideration of a subsequent process.
- the through hole has an inclined region in the stepped portion.
- Such a through-hole including an inclined region causes a disorder of alignment of liquid crystal molecules.
- the formation region of the through-hole and the formation region of the pixel electrode that becomes the effective display region need to be separated from each other by the distance, or the above-described region at the substantially central portion of the pixel electrode that becomes the effective display region. Since the structure for forming the through-hole was used, the liquid crystal molecules in which the effective display area was ensured widely or the liquid crystal molecules in which the alignment disorder was caused by the through-hole were aligned in a predetermined direction serving as the effective display area It has been difficult to reduce the effect on the environment.
- liquid crystal molecules are disordered due to the shape of the inclined region, and the influence is exerted when the size of one pixel is small as in a high-definition liquid crystal display panel. Can no longer be ignored. Therefore, the difference in the alignment disorder of the liquid crystal molecules due to the variation in the fine pattern of the through hole and the slight difference in the shape of the inclined region caused by the manufacturing process causes display defects such as roughness.
- the region where the through-hole is formed that is, the region where the alignment disorder of the liquid crystal molecules occurs, also affects the alignment of the surrounding liquid crystal molecules, and display defects such as roughness are more easily recognized. Become.
- At least a part of the convex portion of the pixel electrode is formed so as to overlap the through hole in plan view.
- the through hole includes not only a substantial contact portion between the drain electrode and the pixel electrode of the active element but also a region of the inclined portion of the insulating layer (the inclined region).
- the liquid crystal display device of the present invention is characterized by including the liquid crystal display panel in order to solve the above-described problems.
- the liquid crystal display panel that can secure high aperture ratio and high transmittance while effectively suppressing deterioration of display quality such as roughness is provided.
- An excellent liquid crystal display device that consumes power can be realized.
- the first insulating substrate is arranged so that the liquid crystal molecules of the liquid crystal layer are similarly aligned in a plurality of different directions in each of the plurality of picture elements.
- a common electrode having a protrusion and / or a notch as an alignment dividing means is formed on the surface in contact with the liquid crystal layer in any one of the second insulating substrates.
- a scanning signal line, a data signal line, and a pixel electrode are formed on the surface of the other of the first insulating substrate and the second insulating substrate that is in contact with the liquid crystal layer.
- the pixel electrode is provided with a notch and a protrusion, and the pixel electrode is formed on an insulating layer and a drain electrode of an active element provided for controlling the pixel electrode. Are electrically connected through the through-holes.
- the pixel electrode is formed on the liquid crystal layer side from the insulating layer, and at least a part of the convex portion of the pixel electrode overlaps the through hole in plan view. It is the structure currently formed.
- the liquid crystal display device of the present invention has the above-described liquid crystal display panel.
- liquid crystal display panel having high aperture ratio and high transmittance as well as high quality display. Furthermore, since a liquid crystal display device including such a liquid crystal display panel can reduce backlight luminance, display with low power consumption can be realized.
- FIG. 1 It is a figure which shows the schematic shape of the pixel electrode with which the array board
- a liquid crystal display device (hereinafter referred to as an MVA liquid crystal display device) including an MVA (Multidomain Vertical Alignment) liquid crystal display panel in which one picture element region is divided into a plurality of domains will be described.
- MVA liquid crystal display device Multidomain Vertical Alignment
- the one pixel region does not only indicate a region corresponding to a pixel electrode directly connected to a TFT element (active element), but a TFT element or a pixel electrode connected to the TFT element; It also includes a region of sub-pixel electrodes connected via a coupling capacitor. Furthermore, the area
- FIG. 2 is a diagram showing a schematic configuration of the liquid crystal display device 13 according to the embodiment of the present invention.
- the liquid crystal display panel 12 includes an array substrate 1 as a first substrate (first insulating substrate) and a counter substrate 5 as a second substrate (second insulating substrate).
- a liquid crystal layer 9 made of a liquid crystal material having a negative dielectric anisotropy is sandwiched.
- the array substrate 1 includes a glass substrate 2 as an insulating substrate, a TFT element forming layer including a TFT element (not shown) formed on the glass substrate 2 and a wiring electrically connected to the TFT element. Electrically connected to the drain electrode of the TFT element through an interlayer insulating film 3 (insulating layer) formed on the TFT element forming layer and a contact hole (not shown) formed in the interlayer insulating film 3
- the pixel electrode 4 is provided, and a vertical alignment film (not shown) is formed on the surface of the pixel electrode 4 on the side in contact with the liquid crystal layer 9.
- the pixel electrode 4 includes a convex part and a notch, and FIG. 2 shows a part 4c of the notch. The details of the protrusions and cutouts of the pixel electrode 4 will be described later.
- the counter substrate 5 includes a glass substrate 6 as an insulating substrate, a counter electrode 7 (common electrode) formed on the glass substrate 6, and a protrusion as an alignment dividing means formed on the counter electrode 7. 8, and a vertical alignment film (not shown) is formed on the surface of the counter electrode 7 and the protrusion 8 on the side in contact with the liquid crystal layer 9.
- the array substrate 1 includes a polarizing plate 10 on the surface opposite to the side in contact with the liquid crystal layer 9, and the counter substrate 5 includes a polarizing plate 11 on the surface opposite to the side in contact with the liquid crystal layer 9. It has been.
- the opposing substrate 5 is provided with the protruding portion 8 which is a protruding structure as the orientation dividing means, but the present invention is not limited to this, and an incision in which the opposing electrode 7 is incised.
- the part (notch part) can also be used as the orientation dividing means.
- the cross-sectional shape of the protrusion part 8 is not limited to the shape shown in FIG. 2, The cross-sectional shape may be triangular shape or trapezoid shape, for example.
- the protrusion 8 is formed in a predetermined shape using a photosensitive resist having a high transmittance in the visible light region, but is not limited thereto.
- red, green, and blue color filter layers are connected to the glass substrate 6 with respect to the pixel electrodes 4 provided for each pixel of the array substrate 1.
- the present invention is not limited to this, and a COA (Color Filter On Array) structure in which the color filter layer is provided on the array substrate 1 side may be employed.
- FIG. 3 is a diagram showing a schematic configuration of the array substrate 1 provided in the liquid crystal display device 13 according to the embodiment of the present invention.
- the array substrate 1 has a display area R1 in which the picture elements PIX are arranged in a matrix, and a data signal line for supplying a signal necessary for displaying an image in the display area R1.
- a drive circuit 19 and a scanning signal line drive circuit 20 are provided.
- the data signal line driving circuit 19 and the scanning signal line driving circuit 20 are arranged in the peripheral area of the display area R1, and each picture of the display area R1.
- the TFT element 16 provided in the element PIX
- the data signal line driving circuit 19 and the scanning signal line driving circuit 20 may be provided externally via a flexible printed circuit board or the like.
- the semiconductor layer of the TFT element 16 is an amorphous semiconductor layer, it is preferable that only the scanning signal line drive circuit 20 is formed monolithically with the TFT element 16.
- the display region R1 of the array substrate 1 is provided with a plurality of data signal lines SL1, SL2,... And a plurality of scanning signal lines GL1, GL2,. .. And the scanning signal lines GL1, GL2,... Are provided with TFT elements 16.
- the image signal input from the data signal line driving circuit 19 is sequentially supplied with a high level scanning signal from the scanning signal line driving circuit 20 to the scanning signal lines GL1, GL2,..., And the scanning signal lines GL1, GL2,.
- the TFT element 16 connected to is turned ON, it is connected to the drain electrode of the TFT element 16 via the source electrode of the TFT element 16 connected to the data signal lines SL1, SL2,. It is supplied to the pixel electrode.
- a liquid crystal capacitor CL indicates a capacitor composed of a pixel electrode connected to the drain electrode of the TFT element 16, a liquid crystal layer, and a counter electrode
- a storage capacitor Cs indicates a drain electrode of the TFT element 16.
- a plurality of storage capacitor lines formed in parallel with the scanning signal lines GL1, GL2,.
- each pixel has a storage capacitor Cs.
- the present invention is not limited to this, and the storage capacitor Cs can be omitted as appropriate.
- FIG. 1 is a diagram showing a schematic shape of a pixel electrode 4 provided on the array substrate 1 of the liquid crystal display device 13 of the present embodiment.
- the three picture elements of the red picture element, the green picture element, and the blue picture element form one set to form one pixel having a substantially square shape.
- Each picture element is formed in a substantially rectangular shape as shown in the figure.
- the picture element electrode 4 formed for each picture element has a convex part 4a, a concave part 4b, and storage capacitor lines CSn-2, CSn-1, CSn,... In one picture element. And a cutout portion 4c in which two corners on the side are cut out.
- the pixel electrode 4 is electrically connected to the drain electrode of the TFT element 16 through the contact hole 17 (through hole) formed in the interlayer insulating film at the convex portion 4 a of the pixel electrode 4. That is, the contact hole 17 is formed on the storage capacitor counter electrode 15 described later.
- the contact hole 17 is generally formed in a forward tapered shape in consideration of a later process. In such a case, the contact hole 17 has an inclined region in the step portion.
- the contact hole 17 shown in FIG. 1 includes not only the substantial contact portion between the drain electrode of the TFT element 16 and the pixel electrode 4, but also the region of the inclined portion of the interlayer insulating film (the inclined region).
- the shape of the contact hole 17 is formed in a rectangular shape in plan view as shown in FIG. 1, but is not limited to this, for example, an elliptical shape It can also be formed in a circular shape or the like.
- the region where the contact hole 17 is formed that is, the region where the alignment disorder of the liquid crystal molecules is generated affects the alignment of the liquid crystal molecules around the region, and display defects such as roughness are more easily recognized. Become.
- the projection 4a of the picture element electrode 4 is formed so as to overlap the contact hole 17 in plan view.
- the pixel electrode 4 can be formed of a conductive material such as ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide).
- the pixel electrode 4 is patterned by forming a resist film having a predetermined pattern on the ITO film or the IZO film and etching the ITO film or the IZO film using the resist film as a mask. be able to.
- the projection 4 a of the pixel electrode 4 is formed so as to overlap with the contact hole 17 including the inclined region in plan view.
- the pixel electrode 4 of the liquid crystal display device 13 has a pixel electrode that is substantially the same as the inclination of the protrusion 8 that is the orientation dividing means provided on the counter substrate 5 side.
- a recess 4b obtained by cutting out 4 into a substantially triangular shape is provided.
- the concave portion 4b of the pixel electrode 4 is formed in a shape in which the concave portion 4b and the convex portion 4a of the pixel electrode 4 of the nearest neighboring pixel can be disposed (partially accommodated).
- the concave portion 4b of the pixel electrode 4 is an orientation dividing unit, and the concave portion 4b and the convex portion 4a of the pixel electrode 4 of the nearest neighboring pixel can be arranged.
- the convex part 4a and the recessed part 4b of the pixel electrode 4 are all formed in the substantially triangular shape, it is not limited to this,
- the convex part 4a is provided in the recessed part 4b. If it is the shape which can be arrange
- At least a part of the recess 4b of the pixel electrode 4 is formed substantially in parallel with the protrusion 8 that is the orientation dividing means provided on the counter substrate 5 side in plan view.
- the convex portion 4a can be disposed in the concave portion 4b.
- the contact hole 17 formed so as to overlap the convex portion 4a of the picture element electrode 4 in plan view is also a storage capacitor Cs forming portion described later. In plan view, they are formed so as to overlap.
- the storage capacitor Cs forming part is formed in the same layer as the scanning signal lines GLn ⁇ 1, GLn... And is connected to the storage capacitor lines CSn-2, CSn-1, CSn.
- the storage capacitor electrode 14 formed up to the recess 4b of the elementary picture element electrode 4, the insulating layer (not shown), and the data signal lines SLm-1, SLm,.
- the storage capacitor counter electrode 15 is connected to the drain electrode of the element 16, is opposed to the storage capacitor electrode 14, and is formed so as to sandwich the insulating layer.
- the contact hole 17 in which the alignment disorder of the liquid crystal molecules occurs and the storage capacitor Cs forming portion that has a metal layer and cannot transmit light are formed so as to overlap at least partially in plan view. Therefore, the liquid crystal display device 13 having a high aperture ratio and a high transmittance can be realized.
- the electrode 15 can be formed using an element selected from Mo, Ta, W, Ti, Al, Cu, Cr, Nd, or the like, or an alloy material or a compound material containing the element as a main component. It is not limited to.
- the pixel electrode 4 is accumulated in one pixel so that the inclination of the protrusion 8 which is the orientation dividing means provided on the counter substrate 5 side is substantially the same.
- a cutout portion 4c is provided in which two corners on the side where the capacitor wirings CSn-2, CSn-1, CSn... Are formed are cut out.
- the notch 4c functions as an orientation dividing means.
- the scanning signal lines GLn ⁇ 1, GLn... And the projections 8 which are orientation dividing means provided on the counter substrate 5 side are planar. It is formed so as to partially overlap in view.
- the pixel electrode 4 does not overlap with the scanning signal lines GLn ⁇ 1, GLn... For supplying a scanning signal to the TFT element 16 electrically connected to the pixel electrode 4 in a plan view. It overlaps with other adjacent scanning signal lines.
- the notch 4c of the pixel electrode 4 is formed substantially in parallel with the protrusion 8 that is the orientation dividing means provided on the counter substrate 5 side in plan view.
- the protrusion 8 that is the orientation dividing means provided on the counter substrate 5 side in plan view.
- it is not limited to this.
- FIG. 4 shows a conventional array substrate in which the pixel electrode is not provided with a convex portion and a concave portion where the convex portion can be arranged, and a concave portion where the convex portion and the convex portion can be arranged on the pixel electrode. It is a figure for demonstrating the difference of the area ratio of an effective opening part with an array board
- FIG. 4A is a diagram showing a schematic shape of the pixel electrode 104 provided on the conventional array substrate 100
- FIG. 4B is a detailed configuration of the fourth embodiment. It is a figure which shows the schematic shape of the pixel electrode 4 with which the array board
- the pixel electrode 104 provided in the conventional array substrate 100 shown in FIG. 4A is not provided with a convex portion and a concave portion in which the convex portion can be arranged on the pixel electrode.
- each picture element provided in the conventional array substrate 100 is 63.5 ⁇ m in width and 190.5 ⁇ m in width
- the area of the light non-transmissive part forming region such as a metal member and the forming region of the alignment dividing means
- the effective aperture area ratio indicating the ratio of the area of each pixel excluding the area and the total area of each picture element is 31.6%
- the pixel electrode 4 is provided with a convex portion 4a and a concave portion 4b in which the convex portion 4a can be arranged.
- the area ratio is 34.9%.
- the shield electrode 21 that shields the electric field of the scanning signal lines GLn-1, GLn,... Is provided on the scanning signal lines GLn-1, GLn,. 1 and other configurations are the same as described in the first embodiment.
- members having the same functions as those shown in the drawings of the first embodiment are given the same reference numerals, and descriptions thereof are omitted.
- FIG. 5 is a diagram showing a schematic shape of the picture element electrode 4 provided on the array substrate 1a of the liquid crystal display device of the present embodiment.
- the convex portion 4a of the picture element electrode 4 is arranged adjacent to the concave portion 4b of the picture element electrode 4 in the adjacent picture element.
- the positions where the concave portions 4b of the pixel electrodes 4 serving as the orientation dividing means are arranged are limited, and as shown in the drawing, the scanning signal lines GLn ⁇ 1.
- a concave portion 4b of the pixel electrode 4 is formed on GLn... And a part of the scanning signal lines GLn ⁇ 1, GLn.
- the shield electrode 21 in the vicinity of the scanning signal lines GLn ⁇ 1, GLn.
- the shield electrode 21 is preferably formed in the same layer as the pixel electrode 4 of the adjacent picture element or the data signal lines SLm-1, SLm.
- the configuration including the shield electrode 21 can shield the electric field of the scanning signal lines GLn ⁇ 1, GLn..., Thereby suppressing the display defect of the liquid crystal display device described above. Can do.
- FIG. 6 shows the schematic shape of the pixel electrode 4 provided on the array substrate 1a of the liquid crystal display device of the present embodiment and the protrusions 8 provided as orientation dividing means on the counter electrode 7 of the counter substrate 5. It is a figure which shows the pattern of 8a.
- the upper region of the contact hole 17 provided in the array substrate 1 a that is, the shield electrode 21 side in the contact hole 17 provided in the array substrate 1 a is oriented on the counter electrode 7 of the counter substrate 5. It is provided so as to overlap with the protrusion 8a provided as the dividing means in plan view.
- the alignment of the liquid crystal molecules is achieved by arranging the protrusions 8a as the alignment dividing means on the upper region of the contact hole 17, that is, on the shield electrode 21 side in the contact hole 17 provided in the array substrate 1a. It can be controlled to be continuously arranged along the protrusions 8 and 8a which are orientation dividing means provided on the counter substrate 5.
- the alignment disorder of the liquid crystal molecules around the contact hole 17 can be suppressed, and the occurrence of a difference in alignment disorder of the liquid crystal molecules due to manufacturing variations of the array substrate 1a and the counter substrate 5 can be suppressed. Therefore, according to the said structure, the liquid crystal display device which can suppress effectively deterioration of display quality, such as a roughness, is realizable.
- the protrusion 8a provided as the orientation dividing means on the counter electrode 7 of the counter substrate 5 is an auxiliary one and a sufficient effect can be obtained.
- the protrusion 8 and the protrusion 8a are formed in a predetermined shape using a photosensitive resist having a high transmittance in the visible light region.
- the present invention is not limited to this. .
- the protrusion 8a is provided on the counter substrate 5 side, but is not limited to this, and may be provided on the array substrate 1a side.
- auxiliary orientation dividing means 4d (second notch portion) is provided at the tip of the V-shaped recess 4b of the pixel electrode 4.
- Other configurations are the same as those described in the first to third embodiments.
- members having the same functions as those shown in the drawings of Embodiments 1 to 3 are given the same reference numerals, and descriptions thereof are omitted.
- FIG. 7 shows the schematic shape of the pixel electrode 4 provided on the array substrate 1b of the liquid crystal display device of the present embodiment and the protrusions 8 provided as orientation dividing means on the counter electrode 7 of the counter substrate 5. It is a figure which shows the pattern of 8a.
- auxiliary orientation dividing means 4d is provided at the tip of the V-shaped recess 4b of the pixel electrode 4.
- the scanning signal line GLn ⁇ is provided.
- the shield electrode 21 described in the second embodiment covers a part of the scanning signal lines GLn ⁇ 1, GLn,. It is preferable to provide as described above.
- the alignment regulating force of the liquid crystal molecules in the vicinity of the tip of the V-shaped recess 4b of the pixel electrode 4 provided with the auxiliary alignment dividing means 4d can be improved, and the liquid crystal molecules can be more effectively used.
- the photo spacer 22 provided on the counter substrate 5 side that serves to keep the cell thickness between the array substrate 1 and the counter substrate 5 constant is between adjacent picture elements. It differs from Embodiments 1 to 4 in that it is provided so as to be arranged in the middle region of the notch 4c of one picture element electrode 4, and the other configurations are the same as in Embodiments 1 to 4. As explained. For convenience of explanation, members having the same functions as those shown in the drawings of Embodiments 1 to 4 are given the same reference numerals, and descriptions thereof are omitted.
- FIG. 8 is a diagram showing a schematic shape of the pixel electrode 4 provided on the array substrate 1a of the liquid crystal display device according to the present embodiment and a pattern of the photo spacer 22 formed on the counter electrode 7 of the counter substrate 5. It is.
- the photo spacer 22 provided on the counter substrate 5 side that serves to keep the cell thickness between the array substrate 1 and the counter substrate 5 constant is adjacent to the picture. It is provided so as to be arranged in an intermediate region between the notches 4c of the two adjacent pixel electrodes 4 between, but not limited to, formed in the notches 4c of the pixel electrodes 4 It only has to be done.
- the number of photo spacers 22 is not particularly limited as long as the cell thickness between the array substrate 1 and the counter substrate 5 can be kept constant.
- the photo spacers 22 are arranged between adjacent pixels of a specific color. You may do it.
- the photospacer 22 is formed in a predetermined shape using a photosensitive resist having a high transmittance in the visible light region, but is not limited to this.
- the photo spacer 22 in the array substrate 1a, the photo spacer 22 can be placed on a flat portion without the picture element electrode 4, and the holding accuracy of the cell thickness can be increased.
- the alignment disorder of the liquid crystal molecules is likely to occur in the vicinity of the formation region of the photo spacer 22, but by arranging the photo spacer 22 in the notch 4 c of the pixel electrode 4, the liquid crystal molecules aligned in a predetermined direction. It is possible to suppress the disturbance of the alignment disorder of the liquid crystal molecules to the effective display region having
- Embodiment 6 Next, a sixth embodiment of the present invention will be described with reference to FIG. This embodiment is different from Embodiments 1 to 5 in that each picture element is formed in a vertically long shape, and the other configuration is as described in Embodiments 1 to 5.
- members having the same functions as those shown in the drawings of Embodiments 1 to 5 are given the same reference numerals, and descriptions thereof are omitted.
- FIG. 9 shows the schematic shape of the pixel electrode 4 provided on the array substrate 1c of the liquid crystal display device of the present embodiment and the protrusions 8 provided as orientation dividing means on the counter electrode 7 of the counter substrate 5. It is a figure which shows the pattern of 8a.
- each picture element is formed in a horizontally long shape (the longitudinal direction of each picture element is the horizontal direction in the drawing) has been described.
- Each picture element provided on the array substrate 1c of the liquid crystal display device of the embodiment is formed in a vertically long shape (the longitudinal direction of each picture element is the vertical direction in the figure).
- the shield electrode 21 described above in the second embodiment is formed using the storage capacitor counter electrode 15.
- the shield electrode 21 described in the second embodiment is replaced with the data signal lines SLm-1, SLm. Except for the point that it can be easily formed by use, even if each picture element is formed in a vertically long shape, the same effect as in the case where each picture element is formed in a horizontally long shape can be obtained.
- the number of protrusions 8b, 8c, and 8d provided as the alignment division means on the counter electrode 7 of the counter substrate 5 is increased, and the pixel electrode 4 of the array substrate 1d has an alignment division means.
- the incised portions 4e and 4f are provided, and the other configurations are as described in the first to sixth embodiments.
- members having the same functions as those shown in the drawings of Embodiments 1 to 6 are given the same reference numerals, and descriptions thereof are omitted.
- FIG. 10 shows a schematic shape of the picture element electrode 4 provided on the array substrate 1d of the liquid crystal display device according to the present embodiment and a pattern of protrusions provided as the orientation dividing means on the counter electrode 7 of the counter substrate 5.
- protrusions 8b, 8c and 8d are formed on the counter electrode 7 of the counter substrate 5 as orientation dividing means, while the pixel electrodes 4 have protrusions 8b, 8c and 8d. Incisions 4e and 4f extending in the same direction as 8d are formed.
- the convex part 4a of the picture element electrode 4 is arranged so as to overlap the contact hole 17 in plan view, and adjacent picture elements are arranged.
- the pixel electrode 4 By disposing the pixel electrode 4 so as to be adjacent to the concave portion 4b of the orientation dividing means, it is possible to realize a high-quality liquid crystal display device that can effectively suppress display quality deterioration such as roughness. .
- a protrusion 8d (second protrusion) is further provided on the counter electrode 7 of the counter substrate 5 as an alignment dividing means on the peripheral region of the contact hole 17 (end of the contact hole 17).
- FIG. 8 an eighth embodiment of the present invention will be described with reference to FIG.
- the present embodiment is different from the first to seventh embodiments in that a black matrix 23 is formed as a light shield on at least a part of the counter substrate 5 that overlaps the convex portion 4a of the pixel electrode 4 in plan view.
- the other configurations are the same as those described in the first to seventh embodiments.
- members having the same functions as those shown in the drawings of Embodiments 1 to 7 are given the same reference numerals, and descriptions thereof are omitted.
- FIG. 11 is a diagram showing a schematic shape of the pixel electrode 4 provided on the array substrate 1a of the liquid crystal display device of the present embodiment and a pattern of the black matrix 23 provided on the counter substrate 5.
- the black matrix 23 is preferably formed on at least a part of the counter substrate 5 that overlaps the convex portions 4a of the picture element electrodes 4 in plan view.
- the liquid crystal molecules in the region where the contact holes 17 are formed are more effectively shielded from alignment disorder, light leakage, and reflected light leakage, and mixed color of adjacent pixels is suppressed. Therefore, in a plan view so as to surround each picture element, the projection 4a of the picture element electrode 4, the formation area of the TFT element 16, and the formation of the storage capacitor lines CSn-2, CSn-1, CSn,.
- the black matrix 23 is formed in the region of the counter substrate 5 that overlaps the region and the formation region of the data signal lines SLm ⁇ 1, SLm...
- the present invention is not limited to this.
- a photosensitive resin containing carbon black is used as the black matrix 23, but the present invention is not limited to this.
- a part of the pixel electrode is notched in the pixel electrode so that at least a part of the convex part of the other pixel electrode adjacent to the one pixel electrode can be accommodated. It is preferable that a concave portion is provided.
- the concave portion of the pixel electrode is formed in a shape in which the convex portion of the pixel electrode of the nearest neighboring pixel can be arranged.
- the concave portion of the pixel electrode is a protrusion and / or a common electrode formed as an alignment dividing unit on the surface of the one substrate in contact with the liquid crystal layer. It is preferable that the cutout portion is formed substantially parallel to the plan view.
- the recessed part of the said pixel electrode is formed in the shape which can arrange
- the recessed portion of the pixel electrode that could not be used as an effective display area can be used more efficiently, suppressing the influence of the alignment disorder caused by the through-hole, A liquid crystal display panel having an aperture ratio and a high transmittance can be realized.
- the wiring provided on the surface of the other substrate in contact with the liquid crystal layer is formed on the substrate side from the shield electrode. It is preferable that at least a part of a portion where a part of the wiring is exposed is formed so as to overlap the shield electrode in a plan view.
- the shield electrode When the shield electrode is not provided at a portion where a part of the wiring for controlling the active element is exposed, the orientation of the liquid crystal is disturbed by the influence of the potential change of the wiring, Impurity ions are trapped at the location, and the trapped location becomes a singular point, resulting in poor alignment of the liquid crystal, leading to display failure of the liquid crystal display panel.
- the electric field of the wiring can be shielded, so that the display defect of the liquid crystal display panel described above can be suppressed.
- a second notch is formed in the recess of the pixel electrode as an alignment dividing means in which a part of the recess is notched.
- the alignment regulating force of the liquid crystal molecules can be improved in the concave portion of the pixel electrode provided with the second notch, and the liquid crystal molecules can be aligned more effectively.
- the protrusions of the pixel electrode is connected to the storage capacitor counter electrode, the insulating layer, and the storage capacitor wiring connected to the drain electrode of the active element in plan view. It is preferably formed so as to overlap with a storage capacitor forming region constituted by the storage capacitor electrode.
- At least a part of the projections of the pixel electrode is provided with a metal layer or the like so that it overlaps at least a part in a plan view with a storage capacitor formation region that cannot transmit light. Therefore, a liquid crystal display panel having a high aperture ratio and a high transmittance can be realized.
- the wiring partially exposed is the scanning signal line, and the shield electrode is formed of the same layer as the pixel electrode or the data signal line. preferable.
- the shield electrode is not provided at the location where the scanning signal line is exposed, impurity ions are trapped at the location during a period when a low level potential is applied to the scanning signal line.
- the trapped portion becomes a singular point, resulting in poor alignment of the liquid crystal, resulting in display failure of the liquid crystal display panel.
- the shield electrode can be easily formed, and the above-described display failure of the liquid crystal display panel can be suppressed.
- a second protrusion is formed on the surface of either one of the first insulating substrate and the second insulating substrate on the side in contact with the liquid crystal layer. It is preferable that it is formed so as to overlap with at least a part of the portion in plan view.
- a photospacer for maintaining the thickness of the liquid crystal layer is formed in a notch portion of the pixel electrode.
- the photo spacer can be placed on a flat portion without the pixel electrode, and the holding accuracy of the thickness of the liquid crystal layer can be increased.
- the effective display region having the liquid crystal molecules aligned in a predetermined direction can be obtained by arranging the photospacer in the notch portion of the pixel electrode. It is possible to suppress the spillover of the alignment disorder of the liquid crystal molecules.
- the liquid crystal display panel of the present invention is in contact with the liquid crystal layer on one of the first insulating substrate and the second insulating substrate that overlaps the through hole in the convex portion of the pixel electrode in plan view. It is preferable that at least a part of the light shielding layer is formed on the side surface.
- the one of the first insulating substrate and the second insulating substrate that overlaps the through hole in the convex portion of the pixel electrode on the side in contact with the liquid crystal layer. Since at least a part of the light shielding layer is formed on the surface, the alignment disorder of the liquid crystal molecules, light leakage, and light leakage of reflected light can be more effectively shielded in the region where the through hole is formed. .
- the present invention is effective as a technique for improving the display quality of an MVA type liquid crystal display device and reducing the mounting cost, and in particular, a mobile medium class product such as a vehicle, a photo frame, an IA (Industrial Appliance), or a PC (Personal Computer). It is particularly useful for a liquid crystal display device mounted on the LCD.
- a mobile medium class product such as a vehicle, a photo frame, an IA (Industrial Appliance), or a PC (Personal Computer). It is particularly useful for a liquid crystal display device mounted on the LCD.
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Abstract
Description
以下、図1~図4に基づいて、本発明の第1の実施形態について説明する。
次に、図5に基づいて、本発明の第2の実施形態について説明する。本実施の形態は、走査信号線GLn-1・GLn・・・上に、走査信号線GLn-1・GLn・・・の電界をシールドするシールド電極21が設けられている点において、実施の形態1とは異なっており、その他の構成については実施の形態1において説明したとおりである。説明の便宜上、上記の実施の形態1の図面に示した部材と同じ機能を有する部材については、同じ符号を付し、その説明を省略する。
次に、図6に基づいて、本発明の第3の実施形態について説明する。本実施の形態は、対向基板5の対向電極7上に配向分割手段として突起部8とともに、さらに他の突起部8a(第2の突起)が、アレイ基板1aに備えられたコンタクトホール17の上側領域(コンタクトホール17の端部)と平面視において重なるように設けられている点において、実施の形態2とは異なっており、その他の構成については実施の形態1および2において説明したとおりである。説明の便宜上、上記の実施の形態1および2の図面に示した部材と同じ機能を有する部材については、同じ符号を付し、その説明を省略する。
次に、図7に基づいて、本発明の第4の実施形態について説明する。本実施の形態は、絵素電極4のV字型の凹部4bの先端に、補助配向分割手段4d(第2の切欠き部)が設けられている点において、実施の形態3とは異なっており、その他の構成については実施の形態1~3において説明したとおりである。説明の便宜上、上記の実施の形態1~3の図面に示した部材と同じ機能を有する部材については、同じ符号を付し、その説明を省略する。
次に、図8に基づいて、本発明の第5の実施形態について説明する。本実施の形態は、アレイ基板1と対向基板5との間のセル厚を一定に保つ役割をする対向基板5側に設けられたフォトスペーサー22が、隣接する絵素間であり、隣接する2つの絵素電極4の切欠き部4cの中間領域に配置されるように設けられている点において、実施の形態1~4とは異なっており、その他の構成については実施の形態1~4において説明したとおりである。説明の便宜上、上記の実施の形態1~4の図面に示した部材と同じ機能を有する部材については、同じ符号を付し、その説明を省略する。
次に、図9に基づいて、本発明の第6の実施形態について説明する。本実施の形態は、各絵素が縦長形状に形成されている点において、実施の形態1~5とは異なっており、その他の構成については実施の形態1~5において説明したとおりである。説明の便宜上、上記の実施の形態1~5の図面に示した部材と同じ機能を有する部材については、同じ符号を付し、その説明を省略する。
次に、図10に基づいて、本発明の第7の実施形態について説明する。本実施の形態は、対向基板5の対向電極7上に配向分割手段として設けられた突起部8b・8c・8dの数を増加させるともに、アレイ基板1dの絵素電極4には、配向分割手段として切開部4e・4fを設けた場合を示している点において、実施の形態1~6とは異なっており、その他の構成については実施の形態1~6において説明したとおりである。説明の便宜上、上記の実施の形態1~6の図面に示した部材と同じ機能を有する部材については、同じ符号を付し、その説明を省略する。
次に、図11に基づいて、本発明の第8の実施形態について説明する。本実施の形態は、平面視において、絵素電極4の凸部4aと重なる対向基板5の少なくとも一部に、遮光体としてブラックマトリクス23が形成されている点において、実施の形態1~7とは異なっており、その他の構成については実施の形態1~7において説明したとおりである。説明の便宜上、上記の実施の形態1~7の図面に示した部材と同じ機能を有する部材については、同じ符号を付し、その説明を省略する。
2 ガラス基板(第1の絶縁基板)
3 層間絶縁膜(絶縁層)
4 絵素電極
4a 凸部
4b 凹部
4c 切欠き部
4d 補助配向分割手段(第2の切欠き部)
5 対向基板
6 ガラス基板(第2の絶縁基板)
7 対向電極(共通電極)
8 突起部(突起)
8a・8d 突起部(第2の突起)
9 液晶層
12 液晶表示パネル
13 液晶表示装置
14 蓄積容量電極
15 蓄積容量対向電極
16 TFT素子(アクティブ素子)
17 コンタクトホール(貫通孔)
18 半導体層
21 シールド電極
22 フォトスペーサー
23 ブラックマトリクス(遮光層)
SLm データ信号線
GLn 走査信号線
PIX 絵素
CS 蓄積容量
R1 表示領域
Claims (11)
- 第1の絶縁基板と、
第2の絶縁基板と、
上記第1の絶縁基板と上記第2の絶縁基板との間に挟持された負の誘電異方性を示す液晶層と、
複数の絵素とを備えた液晶表示パネルであって、
上記複数の絵素の各絵素において、同様に上記液晶層の液晶分子が複数の異なる方向に配向されるように、
上記第1の絶縁基板および上記第2の絶縁基板の内の何れか一方の基板における上記液晶層と接する側の面には、配向分割手段として突起および/または、切欠き部を有する共通電極が形成されており、
上記第1の絶縁基板および上記第2の絶縁基板の内の他方の基板における上記液晶層と接する側の面には、走査信号線と、データ信号線と、絵素電極とが形成されており、
上記絵素電極には、切欠き部と、凸部とが備えられており、
上記絵素電極は、上記絵素電極を制御するために備えられたアクティブ素子のドレイン電極と、絶縁層に形成された貫通孔を介して電気的に接続されており、
上記他方の基板において、上記絵素電極は、上記絶縁層より上記液晶層側に形成されており、
上記絵素電極の凸部の少なくとも一部は、平面視において、上記貫通孔と重なるように形成されていることを特徴とする液晶表示パネル。 - 上記絵素電極には、一方の絵素電極に隣接する他方の絵素電極の凸部を少なくとも一部収容できるように、上記絵素電極の一部が切欠かれた凹部が備えられていることを特徴とする請求項1に記載の液晶表示パネル。
- 上記絵素電極の凹部の少なくとも一部は、上記一方の基板における上記液晶層と接する側の面に、配向分割手段として形成された突起および/または、共通電極の切欠き部と、平面視において略平行に形成されていることを特徴とする請求項2に記載の液晶表示パネル。
- 上記他方の基板における上記液晶層と接する側の面に備えられた配線は、シールド電極より上記基板側に形成されており、
上記絵素電極の凹部において、上記配線の一部が露出されている箇所の少なくとも一部は、平面視において、上記シールド電極と重なるように形成されていることを特徴とする請求項2または3に記載の液晶表示パネル。 - 上記絵素電極の凹部には、上記凹部の一部が切欠かれた配向分割手段として第2の切欠き部が形成されていることを特徴とする請求項2から4の何れか1項に記載の液晶表示パネル。
- 上記絵素電極の凸部の少なくとも一部は、平面視において、上記アクティブ素子のドレイン電極に接続された蓄積容量対向電極と絶縁層と蓄積容量配線に接続された蓄積容量電極とで構成される蓄積容量の形成領域と重なるように形成されていることを特徴とする請求項1から5の何れか1項に記載の液晶表示パネル。
- 一部が露出された上記配線は、上記走査信号線であり、
上記シールド電極は、上記絵素電極または、上記データ信号線と同一層によって形成されていることを特徴とする請求項4に記載の液晶表示パネル。 - 上記第1の絶縁基板および上記第2の絶縁基板の何れか一方の基板における上記液晶層と接する側の面には、
第2の突起が、上記貫通孔の端部の少なくとも一部と、平面視において重なるように形成されていることを特徴とする請求項1から7の何れか1項に記載の液晶表示パネル。 - 上記液晶層の厚さを保持するためのフォトスペーサーは、
上記絵素電極の切欠き部に形成されていることを特徴とする請求項1から8の何れか1項に記載の液晶表示パネル。 - 平面視において、上記絵素電極の凸部における上記貫通孔と重なる上記第1の絶縁基板および上記第2の絶縁基板の何れか一方の基板における上記液晶層と接する側の面には、少なくとも一部遮光層が形成されていることを特徴とする請求項1から9の何れか1項に記載の液晶表示パネル。
- 請求項1から10に記載の液晶表示パネルを備えていることを特徴とする液晶表示装置。
Priority Applications (7)
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JP2012501641A JP5373182B2 (ja) | 2010-02-24 | 2010-11-19 | 液晶表示パネルおよび液晶表示装置 |
RU2012137268/28A RU2511647C1 (ru) | 2010-02-24 | 2010-11-19 | Жидкокристаллическая панель отображения и жидкокристаллическое устройство отображения |
KR1020127022365A KR101363781B1 (ko) | 2010-02-24 | 2010-11-19 | 액정 표시 패널 및 액정 표시 장치 |
BR112012020985A BR112012020985A2 (pt) | 2010-02-24 | 2010-11-19 | painel de exibição de cristal líquido, e dispositivo de exibição de cristal líquido |
CN201080064137.3A CN102763030B (zh) | 2010-02-24 | 2010-11-19 | 液晶显示面板和液晶显示装置 |
EP10846619.4A EP2541315B1 (en) | 2010-02-24 | 2010-11-19 | Liquid crystal display panel, and liquid crystal display device |
US13/578,368 US8681297B2 (en) | 2010-02-24 | 2010-11-19 | Liquid crystal display panel, and liquid crystal display device |
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JP (1) | JP5373182B2 (ja) |
KR (1) | KR101363781B1 (ja) |
CN (1) | CN102763030B (ja) |
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TWI470495B (zh) * | 2012-07-20 | 2015-01-21 | Unidisplay Inc | 觸控基板、顯示面板以及圖案化遮光層 |
US20140268273A1 (en) * | 2013-03-15 | 2014-09-18 | Pixtronix, Inc. | Integrated elevated aperture layer and display apparatus |
KR102144432B1 (ko) * | 2013-11-06 | 2020-08-13 | 엘지디스플레이 주식회사 | 플렉서블 표시 장치 및 커브드 표시 장치 |
JP6776060B2 (ja) * | 2016-08-29 | 2020-10-28 | 株式会社ジャパンディスプレイ | 表示装置 |
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EP2541315A1 (en) | 2013-01-02 |
US20120314170A1 (en) | 2012-12-13 |
RU2511647C1 (ru) | 2014-04-10 |
CN102763030A (zh) | 2012-10-31 |
RU2012137268A (ru) | 2014-03-27 |
JPWO2011104956A1 (ja) | 2013-06-17 |
JP5373182B2 (ja) | 2013-12-18 |
BR112012020985A2 (pt) | 2016-05-03 |
KR20120116498A (ko) | 2012-10-22 |
EP2541315A4 (en) | 2013-08-21 |
EP2541315B1 (en) | 2014-09-24 |
CN102763030B (zh) | 2014-12-17 |
US8681297B2 (en) | 2014-03-25 |
KR101363781B1 (ko) | 2014-02-14 |
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