WO2015046156A1 - 液晶表示素子 - Google Patents

液晶表示素子 Download PDF

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Publication number
WO2015046156A1
WO2015046156A1 PCT/JP2014/075111 JP2014075111W WO2015046156A1 WO 2015046156 A1 WO2015046156 A1 WO 2015046156A1 JP 2014075111 W JP2014075111 W JP 2014075111W WO 2015046156 A1 WO2015046156 A1 WO 2015046156A1
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Prior art keywords
slit
liquid crystal
electrode
axis
display element
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PCT/JP2014/075111
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English (en)
French (fr)
Japanese (ja)
Inventor
小林　和也
隆治 五十嵐
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日本精機株式会社
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Priority to CN201480052028.8A priority Critical patent/CN105612457B/zh
Publication of WO2015046156A1 publication Critical patent/WO2015046156A1/ja

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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
    • 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

Definitions

  • the present invention relates to a liquid crystal display element, and more particularly, to a vertical alignment (VA (Vertical Alignment) type) liquid crystal display element.
  • VA Vertical Alignment
  • Patent Document 1 discloses a liquid crystal display element in which a viewing angle dependency is reduced by providing a slit in a transparent electrode to control a direction in which liquid crystal molecules collapse.
  • the liquid crystal display element according to Patent Document 1 has a slit that is partially removed in a substantially rectangular shape in both transparent electrodes on a pair of substrates in a display region formed by the transparent electrodes on the pair of substrates.
  • the slits provided in one transparent electrode and the slits provided in the other transparent electrode are alternately arranged in the direction perpendicular to the longitudinal direction of the slit in the display area. .
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a liquid crystal display element having a good display appearance while reducing the viewing angle dependency.
  • the liquid crystal display element according to the present invention is A liquid crystal layer, a pair of substrates facing each other with the liquid crystal layer interposed therebetween, a first electrode provided on one of the pair of substrates, and a second electrode provided on the other of the pair of substrates.
  • a vertical alignment type liquid crystal display element, The first electrode has a first slit extending along a predetermined axis when viewed from the normal direction of the pair of substrates.
  • the second electrode has a second slit extending along the axis when viewed from the normal direction,
  • Each of the first slit and the second slit is one or more,
  • the first slit and the second slit along the axis Are arranged in a row with alternating positions, Among the first slit and the second slit arranged in a line along the axis in the pixel region, the slit located on the most end side and the slit located on the other end side in the direction along the axis.
  • FIG. 4 is a diagram corresponding to FIG. 3, where (a) is a plan view of a front side electrode and (b) is a plan view of a back side electrode.
  • FIG. 4 is a schematic cross-sectional view taken along the line BB shown in FIG.
  • FIG. (A) is the schematic sectional drawing which cut the liquid crystal display element which concerns on one Embodiment of this invention along the axis line shown in FIG.
  • (B) is the schematic sectional drawing which cut the liquid crystal display element which concerns on a prior art example along the axis line shown in FIG. (A)
  • (b) is a top view of the electrode which concerns on a modification. It is a figure showing the shape of the electrode which concerns on a prior art example. It is a figure which shows the microscope picture of the pixel edge part of the conventional liquid crystal display element, and is a figure for demonstrating the alignment nonuniformity which had generate
  • A)-(c) is a figure which shows the microscope picture of the pixel of a liquid crystal display element
  • (a) is a figure of the prior art example without an edge part slit
  • (b) is the width
  • (C) is a figure in case the width
  • the liquid crystal display element 100 includes a liquid crystal cell 10 and polarizing plates 20 and 30.
  • the liquid crystal display element 100 displays a predetermined image by appropriately switching a pixel to be described later to a transmissive / non-transmissive state.
  • a user (viewer of a displayed image) side from a predetermined member will be described as a front side, and the opposite side will be appropriately described as a back side.
  • the liquid crystal cell 10 is a vertical alignment type (VA type) liquid crystal cell. As shown in FIG. 1, a pair of front substrate 1F and back substrate 1R, electrodes 2F, 2R, alignment films 3F, 3R, and liquid crystal And a layer 4.
  • VA type vertical alignment type
  • the front side substrate 1F and the back side substrate 1R are each formed of, for example, glass, plastic or the like transparently.
  • the front substrate 1F and the back substrate 1R are arranged to face each other with the liquid crystal layer 4 interposed therebetween.
  • the front substrate 1 ⁇ / b> F is located on the front side of the liquid crystal cell 10
  • the back substrate 1 ⁇ / b> R is located on the back side of the liquid crystal cell 10.
  • the electrodes 2F and 2R are each composed of an ITO (Indium Tin Oxide) film or the like mainly composed of indium oxide, and are transparent electrodes that transmit light.
  • the electrode 2F is formed on the surface of the front substrate 1F on the liquid crystal layer 4 side, and the electrode 2R is formed on the surface of the back substrate 1R on the liquid crystal layer 4 side by a known method (sputtering, vapor deposition, etching, etc.).
  • the electrode 2F is configured as a common electrode, and the electrode 2R is configured as a segment electrode.
  • a voltage is applied to both electrodes by a passive drive system. That is, the liquid crystal display element 100 is a segment display type and configured as a passive drive type liquid crystal display element.
  • the electrode 2R may be configured as a segment electrode, and the electrode 2F may be configured as a common electrode. Further, the electrodes 2F and 2R are formed to have slits unique to the present embodiment. This will be described in detail later.
  • the electrodes 2F and 2R are each patterned in a predetermined shape.
  • the liquid crystal display element 100 has the predetermined shape in a region where the electrode 2F and the electrode 2R overlap as viewed from the normal direction of the opposing surfaces of the front substrate 1F and the back substrate 1R (hereinafter simply referred to as the substrate normal direction). Pixels corresponding to are displayed.
  • the pixel is an element of an image displayed by the liquid crystal display element 100, and includes not only a figure but also a single element representing a symbol such as a character, a number, or an icon.
  • the liquid crystal display element 100 transmits light in the region where the on-voltage is applied to the liquid crystal layer 4 through the electrodes 2F and 2R, thereby bringing the pixels corresponding to the region into a display state (displaying substantially white). .
  • the liquid crystal display element 100 is configured as a so-called negative display type (normally black mode) in which pixels are displayed substantially white on a substantially black background region.
  • the liquid crystal display element 100 is configured as a 7-segment display and displays an image indicating a numerical value (in the figure, “8” is displayed). In this example, there are seven pixels 5 (segments) representing a figure, and a numerical value is displayed by a combination thereof.
  • a region where the electrode 2F and the electrode 2R do not overlap and a region where no on-voltage is applied are substantially black background regions 6.
  • the routing electrode formed in the background region 6 is omitted.
  • the alignment films 3F and 3R are each a vertical alignment film in contact with the liquid crystal layer 4, and are formed from, for example, polyimide by a known method (for example, flexographic printing).
  • the alignment film 3F covers the electrode 2F from the liquid crystal layer 4 side
  • the alignment film 3R covers the electrode 2R from the liquid crystal layer 4 side.
  • the alignment films 3F and 3R are arranged such that liquid crystal molecules when no voltage is applied to the liquid crystal layer 4 from the electrodes 2F and 2R (when no voltage is applied) are used as main surfaces (on the liquid crystal layer 4 side) of the front substrate 1F and the back substrate 1R. Oriented substantially perpendicular to the surface facing the surface.
  • the liquid crystal layer 4 is sealed in a space formed by the front substrate 1F, the back substrate 1R, and a sealing material (not shown) that joins both substrates.
  • the liquid crystal layer 4 is made of a liquid crystal material having a negative dielectric anisotropy ⁇ ( ⁇ ⁇ 0). Further, the layer thickness (cell gap) of the liquid crystal layer 4 is kept constant by a spacer (not shown).
  • a voltage equal to or higher than the threshold voltage is applied to the liquid crystal layer 4
  • the liquid crystal molecules are substantially parallel to the main surfaces of both substrates (the front side substrate 1F and the back side substrate 1R).
  • the polarizing plates 20 and 30 emit light incident from one surface side as linearly polarized light along a transmission axis perpendicular to the absorption axis from the other surface side.
  • the polarizing plate 20 is located on the front side of the liquid crystal cell 10
  • the polarizing plate 30 is located on the back side of the liquid crystal cell 10.
  • the polarizing plate 20 and the polarizing plate 30 are arranged so that their absorption axes are orthogonal to each other when viewed from the normal direction of the substrate (orthogonal Nicol arrangement).
  • SHC-13U manufactured by Polatechno Co., Ltd.
  • a back light (not shown) is provided on the back side of the polarizing plate 30.
  • the liquid crystal display element 100 performs transmissive display with light from a backlight.
  • a control device (not shown) is connected to the electrode 2F and the electrode 2R. This control device applies an on-voltage / off-voltage to the electrodes 2F, 2R as appropriate by a passive drive method, and switches the pixel to a transmission / non-transmission state, thereby allowing the liquid crystal display element 100 to be a single pixel or a group of pixels.
  • a predetermined image represented by is displayed.
  • the off voltage is set to a value lower than the threshold voltage at which the liquid crystal molecules start to fall. Therefore, even when an off voltage is applied to the liquid crystal layer 4, the liquid crystal molecules remain substantially vertically aligned. In this case, the polarization direction of the light emitted from the backlight and passing through the polarizing plate 30 is hardly changed by the liquid crystal layer 4. Therefore, most of the light transmitted through the liquid crystal cell 10 from the back side cannot pass through the polarizing plate 20 arranged in a relationship of crossed Nicols with the polarizing plate 30. Therefore, the display of the region to which the off voltage is applied is visually recognized as black (normally black mode).
  • the liquid crystal molecules in the region to which the on-voltage is applied behaves so as to be substantially parallel to the substrate main surface of the liquid crystal cell 10.
  • birefringence occurs in the light transmitted through the liquid crystal layer 4
  • the polarization direction of the light changes, and the light transmitted through the liquid crystal cell 10 from the back side is transmitted through the polarizing plate 20. Therefore, the region where the on-voltage is applied is in the transmissive display state.
  • FIG. 3 is a front view of the electrodes 2F and 2R in a region corresponding to the A portion of the pixel shown in FIG. 4A shows the electrode 2F located on the front side of the electrodes shown in FIG. 3, and FIG. 4B shows the electrode 2R located on the back side among the electrodes shown in FIG. FIG.
  • the electrode 2F is represented by a solid line
  • the electrode 2R is represented by a dotted line.
  • the electrode 2F provided on the front substrate 1F has a slit 7 extending along a predetermined axis when viewed from the normal direction of the substrate.
  • the electrode 2R provided on the back substrate 1R has a slit 8 extending along a predetermined axis when viewed from the normal direction of the substrate.
  • the slit 7 is a hole that penetrates the electrode 2F in the substrate normal direction
  • the slit 8 is a hole that penetrates the electrode 2R in the substrate normal direction, and each is formed in a substantially rectangular shape when viewed from the substrate normal direction. Has been.
  • one of the slit 7 and the slit 8 is one on the predetermined one axis, and the other is two. Then, when viewed from the normal direction of the substrate, in the region of the predetermined pixel 5 formed in the region where the electrodes 2F and 2R overlap, the slits 7 and the slits 8 are alternately positioned along the predetermined one axis. And lined up in a row.
  • the slit located on the most end side in the direction along the axis and the position on the most other side reaches the end of the electrode in which each slit is formed. More specific description will be given below.
  • the slits 7 and 8 are alternately arranged along the axis S1 and arranged in a line, and the slit 7 located on the most end side (for example, the upper end side in the figure) along the axis S1 is shown in FIG.
  • Fig.4 (a) it has reached to the edge part (lower end part in a figure) of the electrode 2F of the front side.
  • a notch-shaped slit 7 is formed at one end and the other end along the axis S1 of the front electrode 2F.
  • an open slit 8 is formed at the center of the width in the direction of the axis S1 of the electrode 2R on the back side.
  • FIG. 3 when attention is paid to the axis S2, there are two slits 8 and one slit 7 on the axis S2.
  • the slits 7 and 8 are alternately arranged along the axis S2 and arranged in a line, and the slit 8 located on the most end side (for example, the upper end side in the figure) along the axis S2 is shown in FIG.
  • the slit 8 that reaches the end (upper end in the figure) of the electrode 2R on the back side and is located on the other end side in the direction along the axis S2 (for example, the lower end side in the figure) As shown in FIG.4 (b), it has reached to the edge part (lower end part in a figure) of the electrode 2R on the back side.
  • a notch-shaped slit 8 is formed at one end and the other end along the axis S2 of the back electrode 2R.
  • the slit 7 which opened was formed in the center part of the width
  • the slit 7, slit 8, and slit 7 are formed on the axis S3 in order from the upper side in the figure, and the slit 8, slit 7, and slit 8 are formed on the axis S4.
  • the slit 7, slit 8, and slit 7 are formed on the axis S5.
  • the slits 7 and the slits 8 which are adjacent to each other along a predetermined one axis are arranged without being spaced from each other.
  • the lower end of the slit 7 located on the upper side in the drawing on the axis S ⁇ b> 1 comes into contact with the upper end of the slit 8 when viewed from the substrate normal direction.
  • the upper end of the slit 7 positioned on the lower side in the drawing on the axis S1 is in contact with the lower end of the slit 8 when viewed from the normal direction of the substrate.
  • the slits 7 and the slits 8 arranged alternately in a line along a predetermined one axis are as if they were one slit when viewed from the normal direction of the substrate. If this is the slit group 9, as shown in FIG. 3, the adjacent slit groups 9 are arranged at a predetermined interval in a direction perpendicular to the direction of the axis along which they are adjacent. For example, the slit group 9 along the axis S1 is disposed at a predetermined interval in the direction perpendicular to the axis S1 and the axis S2 from the slit group 9 along the axis S2.
  • the slits located on the most end side and the other end side in the direction along the predetermined one axis are formed to have the same length.
  • the two slits 7 along the axis S1 have the same length in the direction of the axis S1
  • the two slits 8 along the axis S2 are also formed to have the same length as the slit 7 along the axis S1.
  • the effect of the liquid crystal display element 100 having the electrode in which the slit is formed as described above will be described in comparison with the conventional example.
  • the shape of the electrode of the liquid crystal display element which concerns on a prior art example is shown in FIG.
  • the same reference numerals as those of the liquid crystal display element 100 are assigned to the portions of the liquid crystal display element according to the conventional example shown in FIG. did.
  • FIG. 5 is a schematic cross-sectional view taken along the line BB of FIG. 3 of the liquid crystal display element 100, and schematically shows the electric field E generated between the electrode 2F and the electrode 2R and the liquid crystal molecules 4A of the liquid crystal layer 4. is there.
  • appropriate members are omitted (the same applies to FIGS. 6A and 6B described later).
  • an oblique electric field E as shown in FIG. 5 is generated.
  • the liquid crystal molecules 4A that are aligned substantially vertically are tilted counterclockwise in the drawing (so that the long axis of the liquid crystal molecules 4A is orthogonal to the oblique electric field E). Behave).
  • the best viewing direction is from the upper right direction in the figure, and the direction with poor visibility is from the upper left direction in the opposite figure.
  • the liquid crystal molecules 4A that are aligned substantially vertically are tilted clockwise in the drawing.
  • the best viewing direction is from the upper left direction in the figure, and the direction with poor visibility is from the upper right direction in the opposite figure.
  • the direction in which the visibility of the region D1 is poor matches the best viewing direction of the region D2
  • the direction in which the visibility of the region D2 is poor matches the best viewing direction of the region D1, so the regions D1 and D2 And complement the viewing angle dependency.
  • the slit group 9 is continuously arranged at a predetermined interval in a direction orthogonal to the direction in which the slit group 9 extends, and thus is similar to the relationship between the region D1 and the region D2. Adjacent areas that have the same relationship appear continuously. With this configuration, a so-called multi-domain structure is obtained, and as a result, the viewing angle dependency of the entire pixel region is reduced. This also applies to the conventional example shown in FIG.
  • FIG. 6A is a schematic cross-sectional view of the liquid crystal display element 100 according to the present embodiment taken along the axis S1 shown in FIG.
  • FIG. 6B is a schematic cross-sectional view of the liquid crystal display element according to the conventional example cut along the axis S1 shown in FIG.
  • the electric field E is oblique at the left and right ends (corresponding to the upper end and the lower end along the axis S1 in FIG. 8) of the electrodes 2F and 2R in the conventional example. do not become.
  • the tilt direction of the liquid crystal molecules 4A at the pixel end cannot be controlled by the oblique electric field.
  • the liquid crystal molecules 4A at the pixel end part collapse in an orderly manner in both the clockwise direction and the counterclockwise direction in FIG. 6B when a voltage is applied.
  • the alignment unevenness L as shown in FIG. 9 occurs, and the end of the pixel 5A is visually recognized.
  • FIG. 6A in the drawing, at the left and right ends (corresponding to the upper end and the lower end along the axis S1 in FIG. 3), An oblique electric field E is generated.
  • the liquid crystal molecules 4A at the end of the pixel behave so that the oblique electric field E and the major axis thereof are orthogonal to each other when a voltage is applied, and the direction in which the liquid crystal molecule 4A falls is controlled.
  • the liquid crystal molecules 4A at the left end in FIG. 6A which are aligned substantially vertically, are inclined almost uniformly counterclockwise in the figure when a voltage is applied.
  • the behavior of the liquid crystal molecules 4A at the electrode ends along the axis S1 has been described, but the same applies to the electrode ends along the other axes S2, S3, and the like.
  • the structure of the electrodes 2F and 2R having the slits 7 and 8 according to the present embodiment it is possible to satisfactorily reduce the alignment unevenness generated at the end of the pixel. That is, according to the liquid crystal display element 100 according to the present embodiment, it is possible to reduce the alignment unevenness at the end of the pixel while reducing the viewing angle dependency, and the display quality is good.
  • slits 7 and 8 a preferred embodiment of forming the slits 7 and 8 will be described with reference to FIGS. 10 and 11A to 11C.
  • end slits slits positioned at both ends in the direction along the axis.
  • the end slit 7A, the slit 8, and the end slit 7B are positioned in order from the upper side in the figure. To do.
  • the end slit 7A is located on the most end side in the direction along the axis, and the end slit 7B is located on the other end side in the direction along the axis.
  • the end slits 7A and 7B are formed in the front electrode 2F. Further, in the adjacent slit group 9 (corresponding to the slit group 9 on the axis S4 in FIG.
  • an end slit 8A, a slit 7, and an end slit 8B are located in order from the upper side in the drawing.
  • the end slit 8A is located on the most end side in the direction along the axis, and the end slit 8B is located on the other end side in the direction along the axis.
  • the end slits 8A and 8B are formed in the back electrode 2R. The same applies to the other slit groups 9.
  • the width W of the end slit in the direction orthogonal to the electrode end from the electrode end where the end slit is formed (hereinafter simply referred to as “the width W of the end slit”). Is preferably 10 ⁇ m or more and 50 ⁇ m or less (10 ⁇ m ⁇ W ⁇ 50 ⁇ m). That is, the end slit 7A preferably satisfies the condition that the width W from the end of the electrode 2F in the direction orthogonal to the end of the electrode 2F is 10 ⁇ m or more and 50 ⁇ m or less.
  • the end slit 7B preferably satisfies the condition that the width W from the end of the electrode 2R in the direction orthogonal to the end of the electrode 2R is 10 ⁇ m or more and 50 ⁇ m or less.
  • the present inventor found this condition will be described.
  • FIGS. 11 (a) to 11 (c) show photographs at the time of applying an on-voltage of three types of liquid crystal display elements in which the conditions of slits formed in the electrodes are changed. These are enlarged photographs of predetermined pixels (segments).
  • FIG. 11A shows a liquid crystal display element having electrodes (electrodes without end slits) according to the conventional example shown in FIG.
  • FIG. 11B shows the liquid crystal display element 100 in which the width W of the end slit is set to 50 ⁇ m.
  • FIG. 11C shows the liquid crystal display element 100 in which the width W of the end slit is set to 20 ⁇ m.
  • the interval between adjacent slits in the horizontal direction of FIGS. 8 and 10 is set to 40 ⁇ m, and the width of each slit (the above-mentioned “end slit width W”). ”,
  • the width of each slit in the horizontal direction of FIG. 8 and FIG. 10 is 15 ⁇ m
  • the retardation ( ⁇ nd) of the liquid crystal layer 4 is 350 nm
  • the viewing angle compensation plate is between the liquid crystal cell 10 and the polarizing plates 20 and 30. Inserted.
  • the end slits 7A and 7B formed in the electrode 2F and the end slits 8A and 8B formed in the electrode 2R are all fixed width W. It is formed with.
  • a vertically extending streak visually recognized inside the pixel is a slit formed in the electrode.
  • a substantially rectangular shape (substantially elliptical shape) that is visually recognized at the pixel end (electrode end) and extends vertically is the alignment unevenness (alignment defect) L.
  • each of the alignment unevenness L generated at the pixel end is smaller than in the conventional example. You can see that Thereby, it can suppress that the pixel end is visually recognized. Furthermore, referring to FIG. 11C, when an end slit is formed in the electrode and the width W is set to 20 ⁇ m, each of the alignment unevenness L generated at the pixel end is further reduced, and the pixel It can be seen that they are distributed evenly along the edges. Thereby, it can suppress more favorably that the pixel end is visually recognized.
  • the smaller the width W of the end slit the better from the viewpoint of the appearance of display.
  • the width W of the end slit is too small, it is difficult to pattern ITO, and the possibility that the electrode is divided increases.
  • the slit group 9 located on the rightmost side in FIG. 10
  • the smaller the width W of the end slits 7A and 7B of the electrode 2F is, the smaller the slit 8 of the electrode 2R formed between them.
  • the electrode 2R becomes closer to the end of the electrode 2R, and the possibility that the electrode 2R is divided by the slit 8 is increased. Therefore, the inventor of the present application sets the lower limit of the width W of the end slit to 10 ⁇ m in consideration of the range in which the electrode patterning can be realized and the range in which the electrode is not easily divided.
  • the alignment unevenness L does not occur so much on the upper and lower sides of the pixel, the upper and lower sides of the pixel are on the left and right sides of the pixel where the angle formed with the direction in which the slit extends is more acute. It can also be inferred from the fact that the alignment unevenness L is likely to occur as compared with FIG. Therefore, the inventors set the upper limit of the width W of the end slit to 50 ⁇ m in consideration of the range in which the effect of reducing the alignment unevenness L can be confirmed by visual recognition.
  • the end slits 7A and 7B formed on the front electrode 2F and the end slits 8A and 8B formed on the back electrode 2R are all the same width. It is also possible to vary the width. However, as shown in FIG. 10, when the widths of the end slits are all the same, the end slits for reducing the alignment unevenness L can be formed uniformly along the pixel ends. It is considered that it is possible to more effectively suppress the pixel end from being visually recognized.
  • FIG. 3 an example in which one of the slit 7 and the slit 8 is one and the other is two on a predetermined axis is shown.
  • FIG. 7A there may be one slit 7 and one slit 8 on a predetermined one axis. Even in such a case, it can be said that the slits 7 and the slits 8 are alternately arranged along a predetermined one axis line.
  • the slit 8 located on the axis S2 can also be considered as end slits as described above.
  • the end slits are formed. It is preferable that the width of the end slit in the direction orthogonal to the electrode end from the electrode end being 10 to 50 ⁇ m.
  • the slits 7 and 8 adjacent to each other are aligned so as to be in contact with each other along a predetermined axis when viewed from the normal direction of the substrate.
  • the present invention is not limited to this.
  • the slits 7 and the slits 8 adjacent to each other along a predetermined one axis may be partially overlapped when viewed from the normal direction of the substrate. In such a mode as well, it can be said that the slits 7 and the slits 8 adjacent to each other along the predetermined one axis line are arranged without a space when viewed from the normal direction of the substrate.
  • the slits adjacent to each other along the predetermined one axis as viewed from the substrate normal direction. 7 and the slit 8 may be spaced apart slightly. However, if the interval is too large, the tilting electric field cannot satisfactorily control the direction in which the liquid crystal molecules 4A are tilted, resulting in a location. Therefore, the slits 7 and 8 adjacent to each other along the predetermined one axis line. The smaller the interval, the better.
  • the present invention is suitable for a liquid crystal display element, and more specifically, for a vertical alignment type (VA (Vertical Alignment) type) liquid crystal display element.
  • VA Vertical Alignment
  • DESCRIPTION OF SYMBOLS 100 Liquid crystal display element 10 ... Liquid crystal cell 1F ... Front side board

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PCT/JP2014/075111 2013-09-24 2014-09-22 液晶表示素子 WO2015046156A1 (ja)

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CN201480052028.8A CN105612457B (zh) 2013-09-24 2014-09-22 液晶显示元件

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JP2013-196870 2013-09-24
JP2013196870 2013-09-24
JP2014184177A JP6451162B2 (ja) 2013-09-24 2014-09-10 液晶表示素子
JP2014-184177 2014-09-10

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09325339A (ja) * 1996-06-04 1997-12-16 Stanley Electric Co Ltd 液晶表示素子およびその製造方法
JP2007187826A (ja) * 2006-01-12 2007-07-26 Stanley Electric Co Ltd 液晶表示素子
JP2011215480A (ja) * 2010-04-01 2011-10-27 Stanley Electric Co Ltd 液晶表示装置
JP2013104958A (ja) * 2011-11-11 2013-05-30 Stanley Electric Co Ltd 液晶表示装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09325339A (ja) * 1996-06-04 1997-12-16 Stanley Electric Co Ltd 液晶表示素子およびその製造方法
JP2007187826A (ja) * 2006-01-12 2007-07-26 Stanley Electric Co Ltd 液晶表示素子
JP2011215480A (ja) * 2010-04-01 2011-10-27 Stanley Electric Co Ltd 液晶表示装置
JP2013104958A (ja) * 2011-11-11 2013-05-30 Stanley Electric Co Ltd 液晶表示装置

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