WO2011024495A1 - 液晶表示装置 - Google Patents
液晶表示装置 Download PDFInfo
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- WO2011024495A1 WO2011024495A1 PCT/JP2010/053814 JP2010053814W WO2011024495A1 WO 2011024495 A1 WO2011024495 A1 WO 2011024495A1 JP 2010053814 W JP2010053814 W JP 2010053814W WO 2011024495 A1 WO2011024495 A1 WO 2011024495A1
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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
- G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
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- the present invention relates to a liquid crystal display device. More specifically, the present invention relates to a liquid crystal display device in a mode in which the initial alignment of liquid crystal molecules is a vertical alignment and an electric field (for example, a horizontal electric field) is generated to control the liquid crystal molecules.
- an electric field for example, a horizontal electric field
- a liquid crystal display (LCD) is characterized by thinness, light weight, and low power consumption, and is widely used in various fields. And the display performance has progressed remarkably with the passage of time, and now it has surpassed CRT (Cathode Ray Tube).
- CRT Cathode Ray Tube
- the display method of the liquid crystal display device is determined by how the liquid crystals are arranged in the cell.
- a display method of a liquid crystal display device for example, a TN (Twisted Nematic) mode, an MVA (Multi-domain Vertical Alignment) mode, an IPS (In-Plane Switching) mode, an OCB (Optically self-conferencing mode), and the like.
- Various display methods are known.
- the IPS mode is a driving method in which the effective retardation is rotated in the plane and the transmittance is controlled by rotating the liquid crystal molecules in the in-plane direction.
- the IPS mode LCD can achieve a wide viewing angle because the change in retardation of the liquid crystal is small depending on the viewing angle.
- a general method for applying a lateral electric field is a method using a comb electrode (see, for example, Patent Document 1).
- a comb electrode has a two-layer structure with an interlayer insulating film interposed therebetween, and if one common electrode is arranged on the lower side, one pixel electrode is arranged on the upper side. On the other hand, if one pixel electrode is arranged on the lower side, one common electrode is arranged on the upper side, and the arrangement relationship between the pixel electrode and the common electrode is changed for each set. Further, in Patent Document 1, the width of the electrode disposed on the lower side of the two-layer structure is the width of the pixel electrode disposed on the liquid crystal layer side as W1 and the width of the common electrode disposed on the transparent substrate side.
- a nematic liquid crystal having a positive dielectric anisotropy is used as a liquid crystal material, and a pair of electrodes having comb teeth is formed while maintaining a high contrast by vertically aligning the nematic liquid crystal.
- a mode display method has been proposed in which a transverse electric field is generated to control the orientation of liquid crystal molecules.
- the background to the present invention will be described using the above mode as an example, but the present invention is not limited to the above mode.
- FIG. 14 and 15 show a liquid crystal of a type in which a transverse electric field is generated by using a pair of electrodes having comb teeth for a liquid crystal layer including a nematic liquid crystal having a positive dielectric anisotropy whose initial alignment is vertical alignment.
- FIG. 14 is a schematic plan view
- FIG. 15 is a schematic cross-sectional view.
- the liquid crystal display device of the reference example of the above mode has a pair of substrates 150 and 160, and the liquid crystal layer 140 is sealed between the pair of substrates 150 and 160.
- Each of the pair of substrates 150 and 160 is mainly composed of transparent substrates 151 and 161, and has an insulating film 154 on the transparent substrate 151.
- a pair of comb-shaped electrodes including a pixel electrode 121 and a common electrode 122 are disposed on the insulating film 154, and the vertical alignment films 152 and 162 are further disposed on the insulating film 154 and the comb-shaped electrodes 121 and 122. Is arranged.
- the liquid crystal molecules 104 both exhibit vertical alignment (homeotropic alignment) when no voltage is applied to the liquid crystal layer 140.
- the voltage can be applied to the liquid crystal layer 140 by the comb-shaped electrodes 121 and 122 formed on one of the pair of substrates 150 and 160. Then, light transmission or blocking is selected by the polarizing plates 153 and 163 disposed on the surface of the transparent substrates 151 and 161 opposite to the liquid crystal layer 140.
- the liquid crystal molecules 104 are applied with voltages by the comb electrodes 121 and 122 (for example, the potential of one comb electrode 121 is V and the potential of the other comb electrode 122 is 0).
- the director distribution Indicates a bend-like orientation in the horizontal direction, the director distribution forms an arch shape along the transverse electric field, and exhibits complementary orientation characteristics between the two adjacent electrodes 121, 122. Even when viewed from the direction, the same display quality as when viewed from the front direction can be visually recognized.
- the state of birefringence of light differs between the front direction and the oblique direction due to the liquid crystal molecules being rod-shaped, and the voltage-transmittance characteristics (V ⁇ The problem that the (T-characteristic) is changed is solved.
- the liquid crystal display device of the reference example of the above mode has a pair of comb-shaped electrodes 121 and 122 in which the comb-tooth portions are alternately meshed with each other at a predetermined interval.
- One of the pair of comb-shaped electrodes is a pixel electrode 121 and is connected to the source wiring 111 via a TFT 117 whose timing is controlled by the gate wiring 112.
- the TFT 117 includes a semiconductor layer 134, a gate electrode 132, a source electrode 131, and a drain electrode 133, and the source electrode 131 connected to the source wiring 111 is connected to the drain electrode 133 through the semiconductor layer 134. Connected with. Then, by applying a gate voltage to the gate electrode 132 connected to the gate wiring 112, the source electrode 131 and the drain electrode 133 are electrically connected through the semiconductor layer 134.
- the drain electrode 133 extends in the row direction along the gate wiring 112 and further extends toward the center of the picture element, and is connected to the Cs electrode 135 having a wide area at the center of the picture element. .
- the Cs electrode 135 is connected to the pixel electrode 121 through a contact portion 141 provided in an insulating film disposed on the drain electrode 133 and the Cs electrode 135.
- the pixel electrode 121 has a portion parallel to the gate wiring 112 and a comb tooth portion protruding in a plane from the portion parallel to the gate wiring 112 and parallel to the source wiring 111.
- a common electrode 122 is disposed along these wirings.
- the gate wiring 112, the source wiring 111, and the common electrode 122 are disposed in different layers with an insulating film interposed therebetween.
- the common electrode 122 includes a portion parallel to the gate wiring 112 and the source wiring 111 and a comb tooth portion protruding in a plane from the portion parallel to the gate wiring 112 and the source wiring 111 and parallel to the source wiring 111. ing.
- the liquid crystal display device of the reference example of the above mode has a Cs wiring 113 that overlaps with the Cs electrode 135.
- the Cs electrode 135 and the Cs wiring 113 are arranged in different layers via an insulating film, and a certain amount of auxiliary capacitance can be formed between them, so that the voltage of the pixel electrode 121 can be stabilized. Can be held.
- the present invention has been made in view of the above situation, and an object thereof is to provide a liquid crystal display device having an improved aperture ratio.
- the inventors of the present invention have made various studies on means for forming an auxiliary capacitor for the voltage held in the electrode for driving the liquid crystal without forming the Cs wiring and the Cs electrode.
- the auxiliary capacitance of the pixel electrode is not formed using the Cs electrode connected to the drain electrode, but the auxiliary capacitance is formed between the pixel electrode and the common electrode.
- the present inventors have found that part or all of the drain electrode, the Cs electrode, and the Cs wiring extended to the central portion of the picture element can be reduced.
- the extending portion extended from the common electrode via the insulating film is overlapped and / or at the position overlapping with the comb tooth portion of the common electrode.
- the auxiliary capacity of the pixel electrode can be sufficiently formed, and separately from the region where the pixel electrode and the common electrode are located.
- the present invention is a liquid crystal display device comprising a pair of substrates disposed opposite to each other and a liquid crystal layer sandwiched between the pair of substrates, wherein the liquid crystal layer has a positive dielectric anisotropy.
- the liquid crystal molecules are aligned in a direction perpendicular to the surfaces of the pair of substrates in a state where no voltage is applied, and one of the pair of substrates is mutually spaced apart from each other by a predetermined interval.
- the first electrode and the second electrode are alternately meshed with each other, and the first electrode is different from the layer formed with the portion meshed with the comb tooth of the second electrode through an insulating film.
- the first electrode has an extension portion, and the extension portion of the first electrode is farther from the liquid crystal layer than the comb teeth portion of the second electrode, and along the comb teeth portion of the second electrode. It is the liquid crystal display device arrange
- liquid crystal display device of the present invention will be described in detail.
- a liquid crystal display device of the present invention includes a pair of substrates disposed to face each other and a liquid crystal layer sandwiched between the pair of substrates.
- the liquid crystal layer is filled with liquid crystal molecules whose orientation is controlled by application of a constant voltage.
- a voltage can be applied to the liquid crystal layer and the orientation of liquid crystal molecules can be controlled.
- the liquid crystal layer contains liquid crystal molecules having positive dielectric anisotropy. Therefore, when a voltage is applied to the liquid crystal layer, the liquid crystal molecules are aligned along the direction of the electric field, and as a result, the liquid crystal molecule group draws an arch shape, for example.
- the liquid crystal molecules are aligned in a direction perpendicular to the surfaces of the pair of substrates when no voltage is applied. By adjusting the initial alignment of the liquid crystal molecules in this way, light can be effectively blocked during black display.
- Examples of a method for vertically aligning liquid crystal molecules without applying voltage include a method in which a vertical alignment film is disposed on a surface in contact with one or both liquid crystal layers of the pair of substrates.
- the term “vertical” includes not only completely vertical but also substantially vertical. The vertical here is preferably in the range of 90 ⁇ 2 °.
- One of the pair of substrates has a first electrode and a second electrode in which the comb teeth portions are alternately meshed with each other at a predetermined interval.
- the electric field generated when a potential difference is applied between a pair of electrodes having such comb teeth is, for example, an arch-shaped lateral electric field. Since liquid crystal molecules exhibit orientation according to the direction of such an electric field, the same display is exhibited regardless of the front direction and the oblique direction with respect to the substrate surface, and good viewing angle characteristics are obtained. .
- the first electrode has an extension portion in a different layer through an insulating film and a layer formed with a portion meshed with the comb tooth portion of the second electrode, and the extension portion of the first electrode is the second electrode
- the electrode is disposed at a position farther from the liquid crystal layer than the comb tooth portion of the electrode and along the comb tooth portion of the second electrode so as to overlap the comb tooth portion of the second electrode. That is, the first electrode has a structure of at least two layers with an insulating film interposed therebetween.
- the first electrodes located in different layers are connected to each other through, for example, contact holes.
- the extension of the first electrode is the comb teeth of the first electrode. And by arrange
- the configuration of the liquid crystal display device of the present invention is not particularly limited by other components as long as such components are formed as essential.
- the width of the extending portion of the first electrode is preferably narrower than the width of the comb-tooth portion of the second electrode.
- the width of the comb tooth portion is the length of the comb tooth portion in the short axis direction.
- the second electrode has an extension portion in a different layer through an insulating film and a layer formed with a portion meshed with the comb tooth portion of the first electrode, and the extension portion of the second electrode is the first electrode It is preferable that the electrode is disposed at a position farther from the liquid crystal layer than the comb tooth portion of the electrode and along the comb tooth portion of the first electrode so as to overlap the comb tooth portion of the first electrode.
- the second electrode also has the above relationship, whereby the auxiliary capacity can be further increased.
- the extending portion of the first electrode and the extending portion of the second electrode may be meshed alternately with a predetermined interval or may not be meshed.
- the width of the extending portion of the second electrode is preferably narrower than the width of the comb tooth portion of the first electrode.
- the first electrode is a pixel electrode
- the second electrode is a common electrode
- the first electrode is a common electrode.
- the form whose said 2nd electrode is a pixel electrode is mentioned.
- an electric field (for example, a transverse electric field) is generated by using a pair of electrodes having comb teeth for a liquid crystal layer including a nematic liquid crystal having a positive dielectric anisotropy whose initial alignment is vertical alignment
- the aperture ratio can be improved in the type of liquid crystal display device.
- FIG. 2 is a schematic plan view of a pixel unit of a TFT substrate provided in the liquid crystal display device of Embodiment 1.
- FIG. FIG. 3 is a schematic cross-sectional view of the liquid crystal display device of Embodiment 1 and shows alignment of liquid crystal molecules in a state where no voltage is applied in the liquid crystal layer.
- FIG. 3 is a schematic cross-sectional view of the liquid crystal display device of Embodiment 1 and shows the alignment of liquid crystal molecules in a state where a voltage is applied in the liquid crystal layer.
- it is the cross-sectional schematic diagram which showed the electrode structure in detail. It is a graph which shows the fluctuation
- FIG. 3 is a schematic plan view showing each manufacturing stage of electrodes and wirings on the TFT substrate of the liquid crystal display device of Embodiment 1.
- FIG. 3 is a schematic plan view showing each manufacturing stage of electrodes and wirings on the TFT substrate of the liquid crystal display device of Embodiment 1.
- FIG. 3 is a schematic plan view showing each manufacturing stage of electrodes and wirings on the TFT substrate of the liquid crystal display device of Embodiment 1.
- FIG. 3 is a schematic plan view showing each manufacturing stage of electrodes and wirings on the TFT substrate of the liquid crystal display device of Embodiment 1.
- FIG. 3 is a schematic plan view showing each manufacturing stage of electrodes and wirings on the TFT substrate of the liquid crystal display device of Embodiment 1.
- FIG. 6 is a schematic plan view illustrating a first modification of the liquid crystal display device according to the first embodiment.
- FIG. 10 is a schematic plan view illustrating a second modification of the liquid crystal display device according to the first embodiment.
- FIG. 10 is a schematic plan view illustrating a third modification of the liquid crystal display device according to the first embodiment. It is a plane schematic diagram of the liquid crystal display device of a reference example. It is a cross-sectional schematic diagram of the liquid crystal display device of a reference example. 6 is a schematic cross-sectional view illustrating a configuration of a liquid crystal display device of Embodiment 2.
- FIG. 10 is a schematic plan view illustrating a first modification of the liquid crystal display device according to the first embodiment.
- FIG. 10 is a schematic plan view illustrating a second modification of the liquid crystal display device according to the first embodiment.
- FIG. 10 is a schematic plan view illustrating a third modification of the liquid crystal display device according to the first embodiment. It is a plane schematic diagram of the liquid crystal display device
- Embodiment 1 The liquid crystal display device according to the first embodiment generates an arch-shaped lateral electric field with respect to a liquid crystal layer by a pair of electrodes formed on the same substrate, and controls the alignment of liquid crystal molecules whose initial alignment is vertical alignment.
- This is a liquid crystal display device of a type that controls display.
- the liquid crystal display device of Embodiment 1 includes a liquid crystal display panel having a pair of substrates disposed to face each other and a liquid crystal layer sandwiched between the pair of substrates. More specifically, the liquid crystal display device of Embodiment 1 includes these members in the order of the TFT substrate, the liquid crystal layer, and the counter substrate from the back side toward the observation surface side.
- the liquid crystal layer contains nematic liquid crystal having positive dielectric anisotropy ( ⁇ > 0).
- the liquid crystal display device of Embodiment 1 includes a backlight unit on the back side of the liquid crystal display panel, and light emitted from the backlight unit passes through these members in the order of the TFT substrate, the liquid crystal layer, and the counter substrate. .
- the display region is configured by a plurality of picture elements (sub-pixels) formed in a matrix, and the driving can be controlled for each picture element. Further, a plurality of these picture elements (for example, three of red, green and blue) constitute one pixel. Note that a pixel in this specification refers to a range surrounded by adjacent gate wirings and source wirings.
- FIG. 1 is a schematic plan view of a pixel unit of a TFT substrate included in the liquid crystal display device according to the first embodiment.
- the TFT substrate is provided with a plurality of columns of source wirings 11 for transmitting image signals, a plurality of rows of gate wirings 12 for transmitting scanning signals, and switching elements, one for each picture element.
- the substrate is an active matrix substrate having a plurality of thin film transistors (TFTs) 17.
- the TFT 17 is provided in the vicinity of the intersection of the source line 11 and the gate line 12.
- the TFT 17 is connected to the source electrode 31 connected to the source line 11, the gate electrode 32 connected to the gate line 12, and the semiconductor layer 34.
- a drain electrode 33 connected to the source electrode 31 is provided.
- the TFT substrate has a pair of comb-shaped electrodes (first electrode and second electrode) including a pixel electrode 21 and a common electrode 22 for applying a constant voltage to the liquid crystal layer in a pixel unit.
- the drain electrode 33 extends in the row direction along the gate wiring 12 and further extends toward the center of the picture element, and is connected to the Cs electrode 35 having a wide area at the center of the picture element. .
- the drain electrode 33 is connected to the pixel electrode 21 through a contact portion 41 provided in an insulating film disposed on the drain electrode 33 and the Cs electrode 35.
- the TFT substrate has a Cs wiring 13 that extends parallel to the gate wiring 12 and overlaps the Cs electrode 35 along the Cs electrode 35.
- the Cs electrode 35 and the Cs wiring 13 are arranged in different layers via an insulating film.
- the source wiring 11 is connected to a source driver, and applies a source voltage, which is an image signal supplied from the source driver, to the pixel electrode 21 via the TFT 17.
- the gate wiring 12 is connected to a gate driver, and a gate voltage serving as a scanning signal supplied in a pulse manner from the gate driver at a predetermined timing is applied to the TFT 17.
- a common voltage maintained at a constant voltage is applied to the common electrode 22.
- FIGS. 2 and 3 are schematic cross-sectional views of the liquid crystal display device of Embodiment 1.
- FIG. FIG. 2 shows the alignment of liquid crystal molecules when no voltage is applied to the liquid crystal layer
- FIG. 3 shows the alignment of liquid crystal molecules when a voltage is applied to the liquid crystal layer.
- the liquid crystal display device of Embodiment 1 has a pair of substrates including a TFT substrate 50 and a counter substrate 60, and the liquid crystal layer 40 is interposed between the TFT substrate 50 and the counter substrate 60.
- the TFT substrate 50 is mainly composed of a transparent substrate 51 having translucency such as glass and resin. On the surface of the transparent substrate 51 on the liquid crystal layer 40 side, the pixel electrode 21 and the common electrode 22 are spaced apart from each other. The structures arranged alternately are provided in different layers with the insulating film 54 interposed therebetween. A first polarizing plate 53 is provided on the surface of the transparent substrate 51 opposite to the liquid crystal layer 40.
- the combination of the pixel electrode 21 and the common electrode 22 closer to the liquid crystal layer 40 is a combination of the comb-tooth portion 21a of the pixel electrode and the comb-tooth portion 22a of the common electrode, and the comb-tooth portions are spaced apart from each other. Are alternately arranged.
- the orientation of the liquid crystal molecules 4 in the liquid crystal layer 40 is controlled by the electric field formed between the comb teeth 21a of the pixel electrode and the comb teeth 22a of the common electrode.
- a vertical alignment film 52 is formed on the surface of the TFT substrate 50 in contact with the liquid crystal layer 40. With the vertical alignment film 52, the initial alignment of the liquid crystal molecules 4 can be aligned perpendicular to the surface of the TFT substrate 50.
- the material of the vertical alignment film 52 include resins such as polyimide.
- the liquid crystal molecules 4 in the liquid crystal layer 40 exhibit homeotropic alignment, that is, alignment perpendicular to the surface of the TFT substrate 50 when no voltage is applied at which the potential of each electrode is 0. ing. More specifically, each major axis of the rod-like liquid crystal molecules 4 is oriented in a direction perpendicular to the substrate surface.
- This combination is a combination of the extending portion 21b of the pixel electrode and the extending portion 22b of the common electrode, and the extending portions 21b and 22b are alternately arranged with a predetermined interval.
- the pixel electrode comb-tooth portion 21 a and the pixel electrode extension portion 21 b are connected to each other through a contact hole formed in the insulating film 54.
- the common electrode comb-tooth portion 22 a and the common electrode extending portion 22 b are connected to each other through a contact hole formed in the insulating film 54.
- the comb-tooth portion 21a of the picture element electrode and the extension portion 21b of the pixel electrode have the same potential (V), and the comb-tooth portion 22a of the common electrode and the extension portion 22b of the common electrode have the same potential (0). is there.
- the extended portion 22b of the common electrode is arranged so as to overlap the comb tooth portion 21a of the pixel electrode along the comb tooth portion 21a of the pixel electrode. Further, since the comb-tooth portion 21a of the pixel electrode and the extending portion 22b of the common electrode are arranged in different layers through the insulating film 54 and have different potentials, the pixel electrode A certain amount of capacitance is formed between the comb tooth portion 21a and the extended portion 22b of the common electrode.
- the extension part 21b of the pixel electrode is arranged so as to overlap the comb tooth part 22a of the common electrode along the comb tooth part 22a of the common electrode. Further, the comb-tooth portion 22a of the common electrode and the extending portion 21b of the pixel electrode are arranged in different layers through the insulating film 54 and have different electric potentials. A certain amount of capacitance is formed between the comb-tooth portion 22a and the extending portion 21b of the pixel electrode.
- the extended portion of the drain electrode 33, the Cs wiring 13, and the Cs electrode 35 are illustrated.
- FIG. 4 is a schematic cross-sectional view showing the electrode configuration in more detail in the liquid crystal display device of the first embodiment.
- the comb-tooth portion 21a of the pixel electrode is wider, and the comb-tooth portion 22a of the common electrode and the pixel element
- the common electrode comb portion 22a is wider than the electrode extension portion 21b. That is, the width of the electrode closer to the liquid crystal layer 40 is larger than the width of the electrode farther from the liquid crystal layer 40.
- W1> W2 is satisfied.
- FIG. 5 is a graph showing the variation in transmittance when the ratio between W1 and W2 is varied.
- the width of the comb teeth 21a of the pixel electrode and the comb teeth 22a of the common electrode is L
- an LCD master manufactured by Shintech Co., Ltd.
- FIG. 6 is a graph showing the change in the auxiliary capacity when the ratio between W1 and W2 is varied.
- the auxiliary capacitance (pF / m) tends to increase as the value of W2 becomes larger than W1.
- a certain capacity or more is required.
- W2 / W1 exceeds 0.5, that is, the value of W2 is larger than half of the value of W1.
- W1 and W2 preferably satisfy the relationship of W1 / 2 ⁇ W2 ⁇ W1.
- the counter substrate 60 mainly includes a transparent substrate 61 having translucency such as glass and resin, and has a second polarizing plate 63 on the surface of the transparent substrate 61 opposite to the liquid crystal layer 40.
- the transmission axis of the first polarizing plate 53 and the transmission axis of the second polarizing plate 63 have a so-called crossed Nicols relationship. Further, the transmission axis of the first polarizing plate 53 and the transmission axis of the second polarizing plate 63 are at an angle of approximately 45 ° with respect to the extending direction of the comb-tooth portion 21a of the pixel electrode and the comb-tooth portion 22a of the common electrode. It has.
- color display can be performed by providing a color filter on the TFT substrate 50 or the counter substrate 60.
- the color filter is composed of, for example, three colors of red, green, and blue, and each color can be driven individually by making one color filter correspond to one picture element.
- a desired color can be obtained in a set of pixel units.
- the color of the color filter is not necessarily limited to these colors, and a set of pixels may be composed of four or more color filters.
- a black black matrix (BM) may be disposed between the color filters of each color, thereby preventing color mixing and light leakage.
- a vertical alignment film 62 is formed on the surface of the counter substrate 60 in contact with the liquid crystal layer 40. With the vertical alignment film 62, the initial alignment of the liquid crystal molecules 4 can be aligned perpendicular to the surface of the counter substrate 60.
- the TFT substrate 50 and the counter substrate 60 are bonded to each other by a sealant applied along the outer periphery of the display region via a columnar spacer such as a resin.
- FIG. 7 to 10 are schematic plan views showing respective stages of manufacturing electrodes and wirings on the TFT substrate of the liquid crystal display device according to the first embodiment.
- a plurality of wirings are provided as the gate wiring 12 so that each of them is extended linearly in the row direction and is parallel to each other.
- the Cs wiring 13 for forming the storage capacitor a wiring is provided at a position that becomes a gap between the gate wirings 12 so as to extend linearly in the row direction and to be parallel to the gate wiring 12.
- a part of the gate wiring 12 is extended with a wiring that becomes the gate electrode 32 of the TFT.
- a semiconductor layer 34 is provided at a position overlapping with the gate electrode 32 via the gate insulating film.
- each source line 11 is each extended in the column direction, and in a pixel shape (half-turned V shape) in units of picture elements, so that they are parallel to each other. A plurality of wirings are provided. Thus, each source line 11 has a zigzag shape when viewed as the entire display area. Each source line 11 is provided so as to cross the gate line 12 and the Cs line 13 with an insulating film interposed therebetween.
- the source electrode 31 and the drain electrode 33 of the TFT are formed, the drain electrode 33 is extended along the gate wiring 12, and the drain electrode 33 is further extended to the center of the picture element. Further, the drain electrode 33 is further extended along the Cs wiring 13 at a position overlapping with the Cs wiring 13 through the insulating film, thereby providing a linear portion (hereinafter also referred to as a Cs electrode 35). As a result, a certain amount of storage capacitance is formed between the Cs wiring 13 and the Cs electrode 35, and the potential of the pixel electrode is stably held. Further, the drain electrode 33 is extended from the Cs electrode 35 toward the gate line 11 in the adjacent row to the vicinity of the gate line 11 in the adjacent row.
- the drain electrode 33 is connected to the pixel electrode, a portion extending from the drain electrode 33 to the center of the pixel, and the vicinity of the gate wiring 12 in the next row from the Cs electrode 35.
- the part extended to 2 constitutes the extension part 21b of the pixel electrode.
- an electrode parallel to the source line 11 and the pixel electrode extension portion 21b is formed between the source line 11 and the pixel electrode extension portion 12b.
- the electrode parallel to the source line 11 and the pixel electrode extension 12b is connected to the common electrode in a later step, and constitutes the extension of the common electrode 22b.
- the extending portions 21b of the pixel electrodes and the extending portions 22b of the common electrode are formed in the same layer, and are alternately arranged with a predetermined interval therebetween.
- the extension part 21b of the pixel electrode and the extension part 22b of the common electrode are connected to the comb tooth part 21a of the pixel electrode or the comb tooth part 22a of the common electrode formed in a later step.
- the lengths of the pixel electrode extending portion 21b and the common electrode extending portion 22b can be appropriately adjusted according to the required auxiliary capacity.
- an insulating film is provided on the whole including the pixel electrode extending portion 21b and the common electrode extending portion 22b.
- two contact portions are provided near the tip of the pixel electrode extending portion 21b.
- (First contact portion) 41 is provided. Both of these two contact portions 41 are portions provided in an insulating film formed between the drain electrode 33 and the pixel electrode 21 so that the TFT 17 can be connected to the drain electrode.
- the pixel electrode 21 is connected to the pixel electrode 21 through the contact 33 and the contact portion 41, and the image signal is supplied from the source wiring 11 to the pixel electrode 21 through the TFT 17 which is turned on for a certain period by the input of the scanning signal. Are supplied at a predetermined timing.
- two contact portions (second contact portions) 42 are also provided in the vicinity of the tip of the extended portion 22b of the common electrode.
- Each of these two contact portions 42 is a portion provided in an insulating film formed between them in order to connect the extended portion 22b of the common electrode and the common electrode formed in a later process.
- the material for the insulating film examples include inorganic materials such as silicon nitride and silicon oxide, and organic materials such as acrylic resin, and the thickness is preferably 0.1 to 3 ⁇ m from the viewpoint of forming the auxiliary capacitance.
- the comb-tooth portion 21a of the pixel electrode and the comb-tooth portion 22a of the common electrode are provided on the insulating film.
- the comb-tooth portion 21a of the picture element electrode is composed of two comb-tooth-shaped portions extending from the position overlapping the first contact portion 41 toward the gate wiring 12 in the adjacent row.
- the common electrode 22 is provided in a layer different from the source wiring 11 and the gate wiring 12 through an insulating film so as to overlap with the source wiring 11 and the gate wiring 12 respectively.
- the common electrode 22 forms a matrix shape corresponding to a shape in which the source line 11 and the gate line 12 are combined when viewed as the entire display region.
- the comb-tooth part 22a of the common electrode formed by extending
- the comb-tooth portion 22a of the common electrode is electrically connected to the extended portion 22b of the common electrode through the second contact portion.
- the comb-tooth portion 21a of the picture element electrode and the comb-tooth portion 22a of the common electrode are both formed in a square shape (half-turned V-shape) in units of picture elements, and are provided so as to be parallel to each other. Further, the comb-teeth portion 21a of the pixel electrode and the comb-teeth portion 22a of the common electrode are arranged so as to be alternately meshed with each other with a certain interval. Further, the comb-tooth portion 21a of the pixel electrode and the comb-tooth portion 22a of the common electrode are provided so as to be parallel to the source wiring 11.
- the width W1 of the comb-tooth portion 21a of the pixel electrode and the comb-tooth portion 22a of the common electrode is preferably set to 1 to 6 ⁇ m, more preferably 2.5 to 4.0 ⁇ m.
- the width W2 of the extended portion 21b of the pixel electrode and the extended portion 22b of the common electrode is smaller than the width of the comb-tooth portion 21a of the pixel electrode and the comb-tooth portion 22a of the common electrode, and is 1.0 to 5.5 ⁇ m. It is preferable to set. More preferably, it is 1.5 to 3.5 ⁇ m.
- the distance between the comb tooth portion 21a of the pixel electrode and the comb tooth portion 22a of the common electrode is preferably 2.5 to 20.0 ⁇ m, more preferably 4.0 to 12.0 ⁇ m. is there.
- Examples of the material of the pixel electrode 21 and the common electrode 22 include metal oxides such as ITO (Indium Tin Oxide) and indium zinc oxide (IZO), or metals such as aluminum and chromium.
- ITO Indium Tin Oxide
- IZO indium zinc oxide
- the metal oxide which has translucency is preferable from a viewpoint of the transmittance
- the source wiring 11, the Cs wiring 13, the Cs electrode 35, and the gate electrode 32, the source electrode 31, and the drain electrode 33 constituting the TFT 17, tantalum, tungsten, titanium, aluminum, chromium, copper, etc. These metals are mentioned.
- the manufacturing process is simplified by using the same material.
- the comb-tooth portion 21 a of the pixel electrode and the comb-tooth portion 22 a of the common electrode each have a dogleg shape (half-turned V-shape) having a symmetric structure with the Cs wiring 13 as the axis of symmetry.
- the comb-tooth portion 21a of the pixel electrode and the comb-tooth portion 22a of the common electrode are linear in an oblique direction with respect to the extending direction of the gate wiring 12, as shown in FIGS.
- the source wiring 11 also extends obliquely with respect to the extending direction of the gate wiring 12 in accordance with the shapes of the comb teeth 21a of the pixel electrode and the comb teeth 22a of the common electrode.
- the extension part 21b of the pixel electrode and the extension part 22b of the common electrode are also formed with respect to the extension direction of the gate wiring 12 in accordance with the shapes of the comb tooth part 21a of the pixel electrode and the comb tooth part 22a of the common electrode. It is necessary to stretch in an oblique direction.
- the comb teeth 21a of the pixel electrode and the comb teeth 22a of the common electrode are linear in the direction orthogonal to the extending direction of the gate wiring 12, as shown in FIG.
- the source wiring 11 also needs to be extended in a direction orthogonal to the extending direction of the gate wiring 12 in accordance with the shapes of the comb teeth 21a of the pixel electrode and the comb teeth 22a of the common electrode.
- the extension part 21b of the pixel electrode and the extension part 22b of the common electrode are also formed with respect to the extension direction of the gate wiring 12 in accordance with the shapes of the comb tooth part 21a of the pixel electrode and the comb tooth part 22a of the common electrode. It is necessary to stretch in a direction perpendicular to the direction.
- FIG. 11 is a schematic plan view illustrating Modification Example 1 of the liquid crystal display device of Embodiment 1
- FIG. 12 is a schematic plan view of Modification Example 2 of the liquid crystal display device of Embodiment 1.
- FIG. 13 is a schematic plan view illustrating a third modification of the liquid crystal display device according to the first embodiment.
- FIG. 16 is a schematic cross-sectional view illustrating the configuration of the liquid crystal display device according to the second embodiment.
- the liquid crystal display device of Embodiment 2 includes a liquid crystal display panel having a liquid crystal layer 40 and a pair of substrates 50 and 60 that sandwich the liquid crystal layer 40, and one of the pair of substrates is a TFT substrate 50. And the other is the counter substrate 60.
- the liquid crystal display device of Embodiment 2 is different from Embodiment 1 in the following points.
- the liquid crystal display device of this embodiment has a counter electrode 71 on the counter substrate 60 side.
- the counter substrate 60 includes a transparent substrate 61.
- a counter electrode 71, a dielectric layer (insulating layer) 72, and a vertical alignment film 62. are stacked in this order.
- a black matrix (BM) and / or a color filter may be provided between the counter electrode 71 and the transparent substrate 61.
- the counter electrode 71 is formed from a transparent conductive film such as ITO or IZO. Each of the counter electrode 71 and the dielectric layer 72 is formed without a break so as to cover at least the entire display area. A predetermined potential common to the picture elements is applied to the counter electrode 71.
- the dielectric layer 72 is formed from a transparent insulating material. Specifically, it is formed from an inorganic insulating film such as silicon nitride, an organic insulating film such as acrylic resin, or the like.
- the TFT substrate 50 includes a transparent substrate 51, and the pixel substrate 21, the common electrode 22, the insulating film 54, and the vertical alignment film 52 are provided on the TFT substrate 50 as in the first embodiment.
- a first polarizing plate 53 and a second polarizing plate 63 are disposed on the outer main surfaces of the TFT substrate 50 and the counter substrate 60.
- the common electrode 22 and the counter electrode 71 may be grounded, and the common electrode 22 and the counter electrode 71 may be applied with voltages having the same magnitude and polarity, or voltages having different magnitudes and polarities may be applied to each other. It may be applied.
- the aperture ratio can be improved as in the first embodiment. Further, the response speed can be improved by forming the counter electrode 71.
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Abstract
Description
実施形態1の液晶表示装置は、同一基板に形成された一対の電極によって液晶層に対してアーチ状の横電界を発生させ、初期配向が垂直配向である液晶分子の配向を制御させることにより画像表示を制御するタイプの液晶表示装置である。
図16は、実施形態2の液晶表示装置の構成を示す断面模式図である。図16に示すように、実施形態2の液晶表示装置は、液晶層40及び液晶層40を挟持する一対の基板50,60を有する液晶表示パネルを備え、一対の基板の一方はTFT基板50であり、他方が対向基板60である。
11:ソース配線
12:ゲート配線
13:Cs配線
17:TFT(薄膜トランジスタ)
21:絵素電極
21a:絵素電極の櫛歯部
21b:絵素電極の延伸部
22:共通電極
22a:共通電極の櫛歯部
22b:共通電極の延伸部
31:ソース電極
32:ゲート電極
33:ドレイン電極
34:半導体層
35:Cs電極
40:液晶層
41:第一のコンタクト部
42:第二のコンタクト部
50:TFT基板
51:透明基板(TFT基板側)
52:垂直配向膜(TFT基板側)
53:第一の偏光板(TFT基板側)
54:絶縁膜
60:対向基板
61:透明基板(対向基板側)
62:垂直配向膜(対向基板側)
63:第二の偏光板(対向基板側)
71:対向電極
72:誘電体層
104:液晶分子
140:液晶層
150,160:基板
121:絵素電極
122:共通電極
141:コンタクト部
151,161:透明基板
152,162:垂直配向膜
153,163:偏光板
Claims (7)
- 互いに対向配置された一対の基板と、該一対の基板間に挟持された液晶層とを備える液晶表示装置であって、
該液晶層は、正の誘電率異方性をもつ液晶分子を含有し、
該液晶分子は、電圧無印加状態で該一対の基板の表面に対して垂直の方向に配向し、
該一対の基板のどちらか一方には、一定間隔を空けて互いの櫛歯部が交互に噛み合わさった第一電極及び第二電極を有し、
該第一電極は、該第二電極の櫛歯部と噛み合わさった部位が形成された層と絶縁膜を介して異なる層に延伸部を有し、
該第一電極の延伸部は、該第二電極の櫛歯部よりも液晶層から遠い位置に、かつ該第二電極の櫛歯部に沿って該第二電極の櫛歯部と重畳して配置されている
ことを特徴とする液晶表示装置。 - 前記第一電極の延伸部の幅は、前記第二電極の櫛歯部の幅よりも細いことを特徴とする請求項1記載の液晶表示装置。
- 前記第二電極は、前記第一電極の櫛歯部と噛み合わさった部位が形成された層と絶縁膜を介して異なる層に延伸部を有し、
前記第二電極の延伸部は、前記第一電極の櫛歯部よりも液晶層から遠い位置に、かつ前記第一電極の櫛歯部に沿って前記第一電極の櫛歯部と重畳して配置されている
ことを特徴とする請求項1又は2記載の液晶表示装置。 - 前記第二電極の延伸部の幅は、前記第一電極の櫛歯部の幅よりも細いことを特徴とする請求項3記載の液晶表示装置。
- 前記第一電極の延伸部と、前記第二電極の延伸部とは、一定間隔を空けて交互に噛み合わさっていることを特徴とする請求項3又は4記載の液晶表示装置。
- 前記第一電極は、絵素電極であり、前記第二電極は、共通電極であることを特徴とする請求項1~5のいずれかに記載の液晶表示装置。
- 前記第一電極は、共通電極であり、前記第二電極は、絵素電極であることを特徴とする請求項1~5のいずれかに記載の液晶表示装置。
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US13/389,882 US20120154730A1 (en) | 2009-08-24 | 2010-03-08 | Liquid crystal display device |
CN201080034569XA CN102472936A (zh) | 2009-08-24 | 2010-03-08 | 液晶显示装置 |
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Cited By (2)
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WO2013001980A1 (ja) * | 2011-06-27 | 2013-01-03 | シャープ株式会社 | 液晶表示パネル及び液晶表示装置 |
WO2013075518A1 (zh) * | 2011-11-25 | 2013-05-30 | 北京京东方光电科技有限公司 | 阵列基板及液晶面板 |
Families Citing this family (8)
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JP5707273B2 (ja) * | 2011-08-12 | 2015-04-22 | 株式会社ジャパンディスプレイ | 液晶表示装置 |
KR20130032743A (ko) * | 2011-09-23 | 2013-04-02 | 삼성디스플레이 주식회사 | 액정 표시 장치 |
CN104330933B (zh) * | 2012-09-05 | 2017-07-18 | 京东方科技集团股份有限公司 | 阵列基板及显示器件 |
CN102830557A (zh) | 2012-09-05 | 2012-12-19 | 京东方科技集团股份有限公司 | 阵列基板及显示器件 |
KR20140046818A (ko) * | 2012-10-11 | 2014-04-21 | 삼성디스플레이 주식회사 | 표시 패널 및 이를 포함하는 표시 장치 |
CN103713438A (zh) * | 2013-12-18 | 2014-04-09 | 合肥京东方光电科技有限公司 | 阵列基板及其制作方法、显示装置 |
US20160216575A1 (en) * | 2015-01-28 | 2016-07-28 | Innolux Corporation | Liquid crystal display panel having three conductive layers |
US11487168B2 (en) * | 2020-01-13 | 2022-11-01 | Beijing Boe Technology Development Co., Ltd. | Liquid crystal panel and display device |
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- 2010-03-08 CN CN201080034569XA patent/CN102472936A/zh active Pending
- 2010-03-08 WO PCT/JP2010/053814 patent/WO2011024495A1/ja active Application Filing
- 2010-03-08 US US13/389,882 patent/US20120154730A1/en not_active Abandoned
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WO1999032924A1 (fr) * | 1997-12-19 | 1999-07-01 | Hitachi, Ltd. | Afficheur a cristaux liquides |
JP2009181091A (ja) * | 2008-02-01 | 2009-08-13 | Epson Imaging Devices Corp | 液晶表示装置 |
Cited By (6)
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WO2013001980A1 (ja) * | 2011-06-27 | 2013-01-03 | シャープ株式会社 | 液晶表示パネル及び液晶表示装置 |
CN103620489A (zh) * | 2011-06-27 | 2014-03-05 | 夏普株式会社 | 液晶显示面板和液晶显示装置 |
JP5654677B2 (ja) * | 2011-06-27 | 2015-01-14 | シャープ株式会社 | 液晶表示パネル及び液晶表示装置 |
JPWO2013001980A1 (ja) * | 2011-06-27 | 2015-02-23 | シャープ株式会社 | 液晶表示パネル及び液晶表示装置 |
US9372371B2 (en) | 2011-06-27 | 2016-06-21 | Sharp Kabushiki Kaisha | Liquid crystal display panel, and liquid crystal display device |
WO2013075518A1 (zh) * | 2011-11-25 | 2013-05-30 | 北京京东方光电科技有限公司 | 阵列基板及液晶面板 |
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