WO2011086743A1 - 液晶表示装置 - Google Patents
液晶表示装置 Download PDFInfo
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- WO2011086743A1 WO2011086743A1 PCT/JP2010/068743 JP2010068743W WO2011086743A1 WO 2011086743 A1 WO2011086743 A1 WO 2011086743A1 JP 2010068743 W JP2010068743 W JP 2010068743W WO 2011086743 A1 WO2011086743 A1 WO 2011086743A1
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- liquid crystal
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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]
Definitions
- the present invention relates to a liquid crystal display device. More specifically, the present invention relates to an oblique electric field type liquid crystal display device.
- An active matrix liquid crystal display device using an active element typified by a thin film transistor (TFT) is widely used as a display device because it is thin and lightweight and has a high image quality comparable to a cathode ray tube.
- the display methods of this active matrix type liquid crystal display device are roughly divided into the following two display methods.
- One is a vertical electric field system.
- a liquid crystal layer is driven by an electric field in a direction substantially perpendicular to the substrate surface, and light incident on the liquid crystal layer is modulated and displayed.
- a TN (Twisted Nematic) mode, an MVA (Multi-domain Vertical Alignment) mode, and the like are known.
- the other is a horizontal electric field method.
- the liquid crystal layer is driven by an electric field in a direction substantially parallel to the substrate surface.
- An IPS (In-plane Switching) mode is known as a horizontal electric field type liquid crystal mode.
- p-type nematic liquid crystal is used as a liquid crystal material, and the liquid crystal is driven by a horizontal electric field using a pair of comb-like electrodes provided on one of a pair of substrates.
- a display method for defining the orientation direction of liquid crystal molecules for example, see Patent Documents 1 and 2).
- an oblique electric field method is also disclosed as a display method other than the above.
- the liquid crystal layer is driven by an electric field oblique to the substrate surface.
- a pair of substrates, a liquid crystal sealed between the pair of substrates, a plurality of stripe electrodes per pixel formed on one substrate, and the other substrate on the other substrate A transparent electrode formed so as to cover substantially the entire surface of the substrate, wherein the plurality of stripe-shaped electrodes have first and second groups of stripe-shaped electrodes parallel to each other;
- a liquid crystal display device is disclosed in which the striped electrodes in the first group receive a first voltage and the striped electrodes in the second group receive a second voltage different from the first voltage (for example, (See Patent Document 3).
- the present invention has been made in view of the above situation, and an object of the present invention is to provide a liquid crystal display device capable of improving transmittance and display quality.
- the present inventors have made various studies on a liquid crystal display device capable of improving transmittance and display quality.
- an electrode formed on the same substrate as the signal line and the scanning line and facing the pixel electrode (first electrode). Attention was paid to (second electrode).
- a part (trunk portion) of the second electrode is disposed on the liquid crystal layer side of the signal line and the scanning line via an insulating film, and is generated by the signal line and the scanning line by overlapping the signal line and the scanning line. It has been found that the influence of the electric field on the liquid crystal molecules can be suppressed, and therefore the disturbance of the alignment of the liquid crystal molecules in the vicinity of the signal lines and the scanning lines can be suppressed, and the above problem can be solved brilliantly. Has reached
- the present invention is a liquid crystal display device comprising a first substrate and a second substrate disposed to face each other, and a liquid crystal layer sandwiched between the first and second substrates, the liquid crystal layer comprising: Liquid crystal molecules having positive dielectric anisotropy, wherein the liquid crystal molecules are aligned perpendicular to the first substrate surface when no voltage is applied, and the first substrate includes a signal line, a scan line, An insulating film; a first electrode to which an image signal is supplied via the signal line; and a second electrode.
- the first electrode includes a first comb-tooth portion; and the second electrode includes: A second comb tooth portion and a trunk portion connected to the second comb tooth portion, wherein the first and second comb tooth portions are arranged to face each other in a plane, and the second substrate is A third electrode covering at least the display region, and the trunk portion is disposed on the liquid crystal layer side of the signal line and the scanning line via the insulating film. With the location is a liquid crystal display device overlapping the signal lines and the scanning lines.
- aligning vertically does not necessarily mean that the pretilt angle is strictly 90 °, and it may be aligned substantially vertically.
- the display area includes a light shielding area formed between and / or within each pixel.
- the pixel may be a picture element.
- the insulating film may be an interlayer insulating film.
- 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 essential.
- a preferred embodiment of the liquid crystal display device of the present invention will be described in detail below. Various forms shown below may be combined as appropriate.
- a mode in which the trunk portion covers the signal line and the scanning line (hereinafter also referred to as a first mode) is preferable. Thereby, the electric field generated by the signal line and the scanning line can be hardly affected on the liquid crystal molecules.
- the first electrode and the second electrode can be effectively and efficiently arranged in the pixel.
- the second electrode and the third electrode may be grounded, or voltages having the same magnitude and polarity (the same magnitude and the same polarity) may be applied to the second electrode and the third electrode. Alternatively, voltages having different magnitudes and polarities (different magnitudes and different polarities) may be applied. In any case, the effect of the present invention can be achieved while realizing display by liquid crystal.
- the second substrate further includes a color filter layer and a dielectric layer disposed on the liquid crystal layer side of the color filter layer, and the third electrode is interposed between the color filter layer and the dielectric layer. It is preferable to be provided. Thus, by providing the dielectric layer on the liquid crystal layer side of the third electrode, the transmittance of the entire pixel can be improved. Further, by providing the third electrode and the dielectric layer on the liquid crystal layer side (between the color filter layer and the liquid crystal layer) of the color filter layer, it is possible to suppress the elution of impurities from the color filter layer to the liquid crystal layer. . As a result, reliability can be improved.
- the transmittance can be improved.
- display quality can be improved.
- FIG. 1 is a schematic plan view showing a liquid crystal display device of Embodiment 1.
- FIG. FIG. 2 is a schematic cross-sectional view taken along the line AB in FIG. 1.
- FIG. 2 is a schematic sectional view taken along line CD in FIG. 1.
- It is a cross-sectional schematic diagram which shows the liquid crystal display device of Embodiment 1, and shows the model used for simulation. The transmittance
- the 3 o'clock direction, 12 o'clock direction, 9 o'clock direction, and 6 o'clock direction when the liquid crystal display device is viewed from the front that is, when the active matrix substrate and the counter substrate surface are viewed from the front, respectively.
- 0 ° direction (azimuth) 90 ° direction (azimuth), 180 ° direction (azimuth) and 270 ° direction (azimuth)
- the direction is the vertical direction.
- each picture element is shown, but a plurality of pixels are arranged in a matrix in the display area (area for displaying an image) of the liquid crystal display device of each embodiment. Is provided. Each pixel is composed of a plurality of (usually three) picture elements.
- the liquid crystal display device of this embodiment generates an electric field in an oblique direction with respect to the substrate surface, and performs image display by controlling the alignment of liquid crystal molecules by the electric field.
- the liquid crystal display device includes a liquid crystal display panel, and the liquid crystal display panel includes a pair of substrates, an active matrix substrate (TFT array substrate) 1 and a counter substrate, as shown in FIGS. 2 and a liquid crystal layer 3 sandwiched between them.
- the substrate 1 is provided on the back side of the liquid crystal display device, and the substrate 2 is provided on the observation surface side.
- a pair of linearly polarizing plates (not shown) are provided on the opposite side of the substrates 1 and 2 from the liquid crystal layer 3.
- the pair of linearly polarizing plates are arranged in a crossed Nicols manner.
- One absorption axis of the pair of linearly polarizing plates is arranged in the 45 ° direction, and the other absorption axis is arranged in the 135 ° direction.
- An optical film such as a retardation plate may be provided between at least one of the substrate 1 and one polarizing plate and between the substrate 2 and the other polarizing plate.
- the substrates 1 and 2 are bonded together by a sealing material provided so as to surround the display area.
- the substrates 1 and 2 are arranged to face each other through a spacer such as plastic beads.
- the liquid crystal layer 3 is formed by sealing a liquid crystal material as a display medium constituting the optical modulation layer in the gap between the substrates 1 and 2. Further, vertical alignment films 19 and 44 are provided on the surfaces of the substrates 1 and 2 on the liquid crystal layer 3 side.
- the liquid crystal layer 3 includes a nematic liquid crystal material having positive dielectric anisotropy.
- the liquid crystal molecules of this material (hereinafter also simply referred to as nematic liquid crystal) are homeostatic when no voltage is applied (when an electric field is not generated by three electrodes described later) due to the alignment regulating force of the vertical alignment films 19 and 44. Indicates tropic orientation.
- the liquid crystal display panel of the present embodiment has a pair of polarizing plates arranged in a crossed Nicol manner and the vertical alignment type liquid crystal layer 3, and thus becomes a normally black mode liquid crystal display panel.
- the vertical alignment films 19 and 44 are formed by coating from a known alignment film material such as polyimide.
- the vertical alignment films 19 and 44 are not usually rubbed, but can align nematic liquid crystal substantially perpendicular to the film surface when no voltage is applied.
- the panel retardation d ⁇ n (product of the cell thickness d and the birefringence ⁇ n of the liquid crystal material) is 280 to 450 nm (preferably 300 to 360 nm). If it exceeds 450 nm, the transmittance may decrease. If it is less than 280 nm, the viewing angle characteristics may deteriorate.
- the counter substrate 2 includes a colorless and transparent insulating substrate 40 made of glass, plastic or the like. On the main surface of the insulating substrate 40 on the liquid crystal layer 3 side, a color filter layer 41, a solid electrode (the counter electrode, the third electrode) 42), a dielectric layer (insulating layer) 43, and a vertical alignment film 44 are laminated in this order.
- the color filter layer 41 includes a plurality of color layers (color filters) provided corresponding to each picture element.
- the color layer is used for color display, and is formed of a transparent organic insulating film such as an acrylic resin containing a pigment, and is mainly formed in the pixel region. As a result, color display is possible.
- Each pixel is composed of, for example, three picture elements that output light of each color of R (red), G (green), and B (blue).
- the kind and number of the color of the picture element which comprises each pixel are not specifically limited, It can set suitably. That is, each pixel may be composed of, for example, three color picture elements of cyan, magenta, and yellow, or may be composed of four or more color picture elements.
- the color filter layer 41 may further include a black matrix (BM) layer that shields light between the pixels.
- BM black matrix
- the BM layer can be formed from an opaque metal film such as chromium, an opaque organic film such as an acrylic resin containing carbon, and the like, and is formed in a region corresponding to a boundary region between adjacent picture elements.
- the solid electrode 42 is formed from a transparent conductive film such as ITO or IZO.
- the solid electrode 42, the dielectric layer 43, and the vertical alignment film 44 are formed without a break so as to cover at least the entire display region.
- a predetermined potential common to the picture elements is applied to the solid electrode 42.
- the dielectric layer 43 is formed from a transparent insulating material. More 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 film thickness of the dielectric layer 43 is about 1.0 to 3.0 ⁇ m when an organic material is used.
- the solid electrode 42 and the dielectric layer 43 By providing the solid electrode 42 and the dielectric layer 43 closer to the liquid crystal layer 3 than the color filter layer 41, it is possible to prevent impurities from eluting from the color filter layer 41 to the liquid crystal layer 3, thereby improving reliability. can do. In addition, a display with little roughness and high contrast can be obtained. This is because if there are irregularities at the interface between the counter substrate 2 and the liquid crystal layer 3, the electric field is disturbed at the irregularities, and the alignment of the nematic liquid crystal is disturbed to generate unnecessary domains. In addition, if there is an uneven portion, the nematic liquid crystal is not vertically aligned at the uneven portion when no voltage is applied (during black display), and the contrast is lowered.
- the active matrix substrate 1 includes a colorless and transparent insulating substrate 10 made of glass, plastic or the like. As shown in FIG. 1, a plurality of signal lines (source buses) are formed on the main surface of the insulating substrate 10 on the liquid crystal layer 3 side. Line) 11, a plurality of scanning lines (gate bus lines) 12, a plurality of capacitance holding wirings (not shown), a plurality of thin film transistors (TFTs) 14, and a plurality of pixels provided separately for each pixel. An electrode 20 (corresponding to the first electrode) and a common electrode 30 (corresponding to the second electrode) provided in common to a plurality of picture elements (for example, all picture elements) are provided.
- the TFT 14 is a switching element (active element), and one TFT is provided for each pixel.
- the scanning lines 12 and the capacitor holding wirings are provided on the insulating substrate 10
- the gate insulating film 17 is provided on the scanning lines 12 and the capacitor holding wirings
- the signal lines 11 are gates.
- an interlayer insulating film 18 is provided on the signal line 11
- the electrodes 20 and 30 are provided on the interlayer insulating film 18, and a vertical alignment film 19 is provided on the electrodes 20 and 30. ing.
- the scanning line 12 and the capacitor holding wiring are formed from a high melting point metal film such as molybdenum or tantalum.
- the gate insulating film 17 is formed from a transparent inorganic insulating film such as silicon oxide or silicon nitride.
- the signal line 11 is formed from a low resistance metal film such as aluminum.
- the interlayer insulating film 18 is formed from a transparent insulating material. More specifically, it is formed of an inorganic insulating film such as silicon oxide or silicon nitride, a transparent organic insulating film such as acrylic resin, or the like.
- the interlayer insulating film 18 may be a stack of a plurality of layers formed of different materials, or may be a stacked body of an inorganic insulating film and an organic insulating film.
- the electrodes 20 and 30 are formed of a transparent conductive film such as ITO or IZO, a metal film such as aluminum or chromium, and the like.
- the signal lines 11 are provided in a straight line parallel to each other, and extend between adjacent picture elements in the vertical direction.
- the scanning lines 12 are provided in a straight line parallel to each other, and extend between adjacent picture elements in the left-right direction.
- the signal line 11 and the scanning line 12 are orthogonal to each other, and a region defined by the signal line 11 and the scanning line 12 is approximately one picture element region.
- the signal line 11 is connected to the source driver outside the display area.
- the scanning line 12 is connected to a gate driver outside the display area, and also functions as a gate of the TFT 14 within the display area.
- a scanning signal is supplied to the scanning line 12 in a pulsed manner from the gate driver at a predetermined timing, and the scanning signal is applied to each TFT 14 by a line sequential method.
- the TFT 14 is provided in the vicinity of the intersection of the signal line 11 and the scanning line 12, and includes a semiconductor layer 15 formed in an island shape on the scanning line 12.
- the TFT 14 includes a source electrode 11a that functions as a source and a drain electrode 13 that functions as a drain.
- the source electrode 11 a connects the TFT 14 and the signal line 11, and the drain electrode 13 connects the TFT 14 and the pixel electrode 20.
- the source electrode 11a and the signal line 11 are connected to each other by forming a pattern from the same film.
- the drain electrode 13 is provided on the gate insulating film 17 and is connected to the pixel electrode 20 through a contact hole 16 provided in the interlayer insulating film 18.
- the TFT 14 is turned on for a predetermined period by the input of the scanning signal, and an image signal is supplied from the signal line 11 to the pixel electrode 20 at a predetermined timing while the TFT 14 is on. As a result, an image signal is written in the liquid crystal layer 3. On the other hand, a predetermined potential common to each picture element is applied to the common electrode 30.
- the image signal is held for a certain period between the pixel electrode 20 to which the image signal is applied and the common electrode 30 and the solid electrode 42 facing the pixel electrode 20. That is, a capacitance (liquid crystal capacitance) is formed between these electrodes for a certain period.
- a holding capacitor is formed in parallel with the liquid crystal capacitor.
- a storage capacitor is formed between an electrode (not shown) connected to the drain electrode 13 and a capacitor storage wiring. Note that the capacitor holding wiring is provided in parallel with the scanning line 12.
- the voltage applied to the pixel electrode 20 is different from both the voltage applied to the common electrode 30 and the voltage applied to the solid electrode 42 except during black display.
- the planar shape of the pixel electrode 20 is comb-shaped, and the pixel electrode 20 has a linear trunk (pixel trunk 21) and a plurality of linear comb teeth (pixel comb-tooth 22).
- the pixel trunk portion 21 is provided along the short side (lower side) of the picture element.
- the pixel comb-tooth portions 22 are connected to each other by being connected to the pixel trunk portion 21. Further, each pixel comb-tooth portion 22 extends from the pixel trunk portion 21 toward the opposing short side (upper side), that is, in the direction of approximately 90 °.
- the pixel trunk 21 and the pixel comb portion 22 are connected to each other by being patterned from the same film.
- the common electrode 30 includes a comb-tooth shape in plan view, and includes a trunk portion (common trunk portion 31) in a plan view lattice shape and a plurality of linear comb-tooth portions (common comb tooth portion 32).
- the common trunk portion 31 is provided in the vertical and horizontal directions so as to overlap the scanning line 12 and the signal line 11.
- the common trunk 31 completely covers the scanning line 12 and the signal line 11.
- the common comb-tooth part 32 is extended from the part located in the upper side of the picture element of the common trunk part 31 toward the lower side which opposes, ie, a substantially 270 degree direction.
- the common trunk portion 31 and the common comb tooth portion 32 are connected to each other by being patterned from the same film.
- the pixel electrode 20 and the common electrode 30 are disposed to face each other so that the comb teeth (the pixel comb tooth portion 22 and the common comb tooth portion 32) are engaged with each other. Further, the pixel comb-tooth portions 22 and the common comb-tooth portions 32 are arranged in parallel with each other and are alternately arranged with an interval. Further, the pixel comb-tooth portion 22 is disposed in parallel with a portion of the common trunk portion 31 that overlaps the signal line 11.
- the widths (minimum widths) of the pixel comb-tooth portion 22 and the common comb-tooth portion 32 are not particularly limited, and can be set as appropriate.
- the size of the interval between the pixel electrode 20 and the common electrode 30 is not particularly limited, and can be set as appropriate.
- the interval between the pixel electrode 20 and the common electrode 30 refers to the interval between the pixel electrode 20 and the common electrode 30 in the short direction (direction perpendicular to the longitudinal direction) of the pixel comb portion 22 and the common comb portion 32 ( Hereinafter, it is also simply referred to as an electrode interval S).
- an oblique electric field (an oblique electric field with respect to the main surfaces of the substrates 1 and 2) is formed from the pixel electrode 20 toward the solid electrode. Further, a horizontal electric field (electric field substantially parallel to the main surfaces of the substrates 1 and 2) is formed from the pixel electrode 20 toward the common electrode 30.
- This transverse electric field serves to help form an oblique electric field. For this reason, the oblique electric field is not weakened even if it is away from the pixel electrode 20 due to the presence of the lateral electric field. Therefore, the nematic liquid crystal that is vertically aligned when no voltage is applied is aligned parallel to the oblique electric field when the voltage is applied.
- the solid electrode 42 When the solid electrode 42 is adjacent to the vertical alignment film 44, equipotential lines are concentrated near the interface between the counter substrate 2 and the liquid crystal layer 3. For this reason, the component in the normal direction of the oblique electric field becomes strong in the liquid crystal layer 3, and the nematic liquid crystal may not fall sufficiently sideways.
- the dielectric layer 43 is provided on the liquid crystal layer 3 side of the solid electrode 42. Therefore, concentration of equipotential lines near the interface between the counter substrate 2 and the liquid crystal layer 3 can be suppressed. Therefore, the component in the normal direction of the oblique electric field in the liquid crystal layer 3 can be weakened. As a result, the nematic liquid crystal can be tilted sideways sufficiently, and the transmittance of the entire picture element can be improved.
- the common trunk portion 31 is disposed on the liquid crystal layer 3 side of the scanning line 12 via the interlayer insulating film 18, and the gate insulating film 17 and the interlayer insulating film are disposed on the liquid crystal layer 3 side of the signal line 11. 18 is arranged. Further, the common trunk 31 overlaps the signal line 11 and the scanning line 12. Therefore, the electric field generated by the signal line 11 and the scanning line 12 can be shielded by the common trunk 31. That is, since this electric field can be suppressed from affecting the nematic liquid crystal, the alignment of the nematic liquid crystal in the vicinity of the signal line 11 and the scanning line 12 can be suppressed. As a result, it can suppress that the transmittance
- the common electrode 30 and the solid electrode 42 may be grounded, or the common electrode 30 and the solid electrode 42 may be applied with voltages having the same magnitude and polarity, or may have different magnitudes and polarities. A voltage may be applied. In any case, it is possible to improve the transmittance and display quality while realizing display by the display method of the present embodiment.
- the common trunk portion 31 covers the signal line 11 and the scanning line 12, the electric field generated by the signal line 11 and the scanning line 12 can be hardly affected on the nematic liquid crystal.
- a region between the common trunk portion 31 and the pixel comb tooth portion 22, that is, an edge portion of the picture element can be used for display. Therefore, the pixel electrode 20 and the common electrode 30 can be effectively and efficiently arranged in the picture element, and the transmittance can be further improved.
- the common trunk portion 31 when the common trunk portion 31 is formed of an opaque material, the common trunk portion 31 can effectively shield light between the picture elements, so that a black matrix (BM) layer is formed on the counter substrate 2. There is no need to do it.
- BM black matrix
- the pixel electrode 20 and the common electrode 30 are patterned using the same film through the same process by the photolithography method, and are arranged on the same layer (the same insulating film).
- the number of pixel comb-tooth portions 22 and common comb-tooth portions 32 in one picture element is not particularly limited as long as both comb-tooth portions are alternately arranged in the picture element, and each is appropriately set. can do.
- two domains in which the tilt direction of the nematic liquid crystal is opposite are formed in one picture element.
- the number of domains is not particularly limited and can be set as appropriate. From the viewpoint of obtaining good viewing angle characteristics, four domains may be formed in one picture element.
- two or more regions having different electrode intervals S may be formed in one picture element.
- a region with a relatively narrow electrode interval (region of Sn) and a region with a relatively wide electrode interval (region of Sw) may be formed in each picture element.
- the threshold value of the VT characteristic in each region can be made different, so that the slope of the VT characteristic (VT curve) of the entire picture element can be made smooth especially at a low gradation.
- the occurrence of whitening can be suppressed and the viewing angle characteristics can be improved.
- whitening is a phenomenon in which a display that should appear dark appears to be whitish when the viewing direction is tilted obliquely from the front in a state where a relatively dark display with low gradation is performed.
- interval Sn and Sw is not specifically limited, Each can be set suitably.
- the model of FIG. 4 includes a pair of substrates and a liquid crystal layer 3 sandwiched between the pair of substrates.
- One substrate includes a wiring 4 provided on the insulating substrate 10, an insulating film 5 provided on the wiring 4, a pixel electrode 20 and a common electrode 30 (pixel comb tooth portion 22 provided on the insulating film 5). , Common trunk portion 31 and common comb tooth portion 32), and vertical alignment 19 provided on electrodes 20 and 30.
- the wiring 4 corresponds to a signal line and a scanning line.
- the wiring 4, the pixel comb tooth portion 22, the common trunk portion 31 and the common comb tooth portion 32 are arranged in parallel to each other.
- the other substrate includes a color filter layer 41 provided on the insulating substrate 40, a solid electrode 42 provided on the color filter layer 41, a dielectric layer 43 provided on the solid electrode 42, and a dielectric layer. And a vertical alignment film 44 provided on 43.
- FIG. 5 shows the result of the comparison mode in which the common trunk portion 31 is not provided on the wiring 4 (W C : none), and the portion between the pixel comb tooth portion 22 and the common comb tooth portion 32, that is, the pixel center portion. Results are also described.
- the horizontal axis in FIG. 5 indicates the position between the electrodes, and the pixel comb tooth portion 22 is on the right side of the scale 1 and the common trunk portion 31 or the wiring 4 is on the left side of the scale 8.
Abstract
Description
本発明の液晶表示装置における好ましい形態について以下に詳しく説明する。以下に示す各種形態は、適宜組み合わされてもよい。
本実施形態の液晶表示装置は、基板面に対して斜め方向の電界を発生させ、該電界により液晶分子の配向を制御することにより画像表示を行う。
・画素櫛歯部22と共通櫛歯部32の間隔S1:8μm
・共通幹部31と画素櫛歯部22の間隔S2:8μm
・画素電極20の電圧:AC(交流)電圧印加(振幅5.5V)
ただし、振幅の中心電位Vcは、共通電極30の電位と同電位に設定
・共通電極30の電圧:DC(直流)電圧0V印加
・ベタ電極42の電圧:DC(直流)電圧0V印加
・配線4の電圧:AC(交流)電圧印加(振幅5.5V)
・配線4の幅W:12μm
・dΔn:340nm
・Δε:22
・絶縁膜5の膜厚:3μm
・絶縁膜5の誘電率ε:3.3
なお、共通幹部31の配線4から両側にはみ出した部分の幅ΔWR及びΔWLは同じ値に設定した。また、共通幹部31の幅をWCとする。
比較形態1の液晶表示装置においては、図6に示すように、信号線11及び走査線12の液晶層3側に共通電極が設けられていない。したがって、信号線11及び走査線12に印加される電圧によって生じる電界の影響により、信号線11及び走査線12近傍の液晶分子の配向が乱れることがある。この場合、該液晶分子は、画素の中心部分の液晶分子とは異なって配向することとなるため、画素全体で均一な配向が得られず、結果的に、透過率が低下することがある。更に、不均一な配向に起因して、焼き付き、残像等の表示不良が発生することがある。
2:対向基板
3:液晶層
4:配線
5:絶縁膜
10、40:絶縁基板
11:信号線
11a:ソース電極
12:走査線
13:ドレイン電極
14:TFT
15:半導体層
16:コンタクトホール
17:ゲート絶縁膜
18:層間絶縁膜
19、44:垂直配向膜
20:画素電極
21:画素幹部
22:画素櫛歯部
30:共通電極
31:共通幹部
32:共通櫛歯部
41:カラーフィルタ層
42:ベタ電極
43:誘電体層
Claims (7)
- 互いに対向配置された第1基板及び第2基板と、前記第1及び第2基板の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、
前記液晶層は、正の誘電率異方性を有する液晶分子を含み、
前記液晶分子は、電圧無印加時に前記第1基板面に対して垂直に配向し、
前記第1基板は、信号線と、走査線と、絶縁膜と、前記信号線を介して画像信号が供給される第1電極と、第2電極とを有し、
前記第1電極は、第1櫛歯部を有し、
前記第2電極は、第2櫛歯部と、前記第2櫛歯部に接続された幹部とを有し、
前記第1及び第2櫛歯部は、画素内において互いに平面的に対向配置され、
前記第2基板は、少なくとも表示領域を覆う第3電極を有し、
前記幹部は、前記信号線及び走査線の前記液晶層側に前記絶縁膜を介して配置されるとともに、前記信号線及び走査線に重なることを特徴とする液晶表示装置。 - 前記幹部は、前記信号線及び走査線を覆うことを特徴とする請求項1記載の液晶表示装置。
- 前記幹部の、前記信号線及び走査線からはみ出した部分の幅は、2μm以上であることを特徴とする請求項2記載の液晶表示装置。
- 前記第2及び第3電極は、接地されることを特徴とする請求項1~3のいずれかに記載の液晶表示装置。
- 前記第2及び第3電極には、同じ大きさかつ極性の電圧が印加されることを特徴とする請求項1~3のいずれかに記載の液晶表示装置。
- 前記第2及び第3電極には、互いに異なる大きさかつ極性の電圧が印加されることを特徴とする請求項1~3のいずれかに記載の液晶表示装置。
- 前記第2基板は、カラーフィルタ層と、前記カラーフィルタ層の前記液晶層側に配置された誘電体層とを更に有し、
前記第3電極は、前記カラーフィルタ層及び誘電体層の間に設けられることを特徴とする請求項1~6のいずれかに記載の液晶表示装置。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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US13/522,402 US20120293756A1 (en) | 2010-01-14 | 2010-10-22 | Liquid crystal display device |
CN2010800598015A CN102695983A (zh) | 2010-01-14 | 2010-10-22 | 液晶显示装置 |
EP10843098A EP2525254A1 (en) | 2010-01-14 | 2010-10-22 | Liquid crystal display device |
BR112012017400A BR112012017400A2 (pt) | 2010-01-14 | 2010-10-22 | dispositivo de tela de cristal líquido |
JP2011549853A JPWO2011086743A1 (ja) | 2010-01-14 | 2010-10-22 | 液晶表示装置 |
RU2012134549/28A RU2509326C1 (ru) | 2010-01-14 | 2010-10-22 | Жидкокристаллическое устройство отображения |
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JP2010006211 | 2010-01-14 | ||
JP2010-006211 | 2010-01-14 |
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PCT/JP2010/068743 WO2011086743A1 (ja) | 2010-01-14 | 2010-10-22 | 液晶表示装置 |
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US (1) | US20120293756A1 (ja) |
EP (1) | EP2525254A1 (ja) |
JP (1) | JPWO2011086743A1 (ja) |
CN (1) | CN102695983A (ja) |
BR (1) | BR112012017400A2 (ja) |
RU (1) | RU2509326C1 (ja) |
WO (1) | WO2011086743A1 (ja) |
Cited By (2)
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WO2014015621A1 (zh) * | 2012-07-27 | 2014-01-30 | 京东方科技集团股份有限公司 | 阵列基板、液晶显示面板和液晶显示器 |
WO2014023046A1 (zh) * | 2012-08-10 | 2014-02-13 | 深圳市华星光电技术有限公司 | 增快液晶反应速度的画素结构 |
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JP2014186121A (ja) * | 2013-03-22 | 2014-10-02 | Panasonic Liquid Crystal Display Co Ltd | 液晶表示装置及びその駆動方法 |
WO2014181494A1 (ja) | 2013-05-09 | 2014-11-13 | パナソニック液晶ディスプレイ株式会社 | 液晶表示装置及びその製造方法 |
JP6548015B2 (ja) * | 2015-08-07 | 2019-07-24 | Tianma Japan株式会社 | 液晶表示装置 |
CN105158993B (zh) * | 2015-08-21 | 2018-06-15 | 京东方科技集团股份有限公司 | 一种显示面板及显示装置 |
CN105047175B (zh) * | 2015-09-17 | 2018-03-30 | 深圳市华星光电技术有限公司 | 显示装置及其驱动方法 |
TWI569426B (zh) * | 2015-12-24 | 2017-02-01 | 財團法人工業技術研究院 | 畫素陣列結構、顯示面板以及畫素陣列結構的製作方法 |
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- 2010-10-22 JP JP2011549853A patent/JPWO2011086743A1/ja not_active Withdrawn
- 2010-10-22 BR BR112012017400A patent/BR112012017400A2/pt not_active Application Discontinuation
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Also Published As
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EP2525254A1 (en) | 2012-11-21 |
JPWO2011086743A1 (ja) | 2013-05-16 |
CN102695983A (zh) | 2012-09-26 |
US20120293756A1 (en) | 2012-11-22 |
BR112012017400A2 (pt) | 2016-04-19 |
RU2509326C1 (ru) | 2014-03-10 |
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