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`JAPAN DISPLAY INC. - EX. 2013
`TIANMA MICROELECTRONICS CO. LTD. v. JAPAN DISPLAY INC
`IPR2021-01058
`
`

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`(6)
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`JP 2005-107535 A 2005.4.21
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`JAPAN DISPLAY INC. - EX. 2013
`TIANMA MICROELECTRONICS CO. LTD. v. JAPAN DISPLAY INC
`IPR2021-01058
`
`

`

`(7)
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`JP 2005-107535 A 2005.4.21
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`IPR2021-01058
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`2
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`JP 2005-107535 A 2005.4.21
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`JAPAN DISPLAY INC. - EX. 2013
`TIANMA MICROELECTRONICS CO. LTD. v. JAPAN DISPLAY INC
`IPR2021-01058
`
`

`

`(9)
`
`JP 2005-107535 A 2005.4.21
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`JAPAN DISPLAY INC. - EX. 2013
`TIANMA MICROELECTRONICS CO. LTD. v. JAPAN DISPLAY INC
`IPR2021-01058
`
`

`

`
`
`
`
`
`JP 2005-107535 A 4/21/2005
`
`(19) Japan Patent Office (JP)
`
`(12) Publication of Unexamined
`Japanese Patent Application (A)
`
`(11) Laid-Open Patent
`Application No. 2005-107535
`(P2005-107535A)
`
`(43) Published date: April 21, 2005
`
`Theme code (reference)
`
`Request for examination: not requested, Number of claims: 12 OL (total of 9 pages)
`
`(21) Application No.:
`
`Japanese Patent Application 2004-
`280294 (P2004-280294)
`September 28, 2004
`(22) Filing date:
`(31) Priority application No.: 2003-066965
`(32) Priority date:
`September 26, 2003
`(33) Priority country: Korea (KR)
`
`(71) Applicant:
`
`
`
`(74) Agent:
`
`(72) Inventor:
`
`
`(72) Inventor:
`
`
`
`
`303016487
`Boe-Hydis Technology Co Ltd.
`San 136-1, Ami-ri, Bubal-eup, Ichon-shi,
`Kyoungki-do, Korea
`110000051
`Kyosei International Patent Office
`Lee Kyung Ha
`301-1403, Ami3-ri, Bubal-eup, Ichon-shi,
`Kyoungki-do, Korea
`An Chi Wook
`#203, 304-1, Seongnam-daero, Yatap-dong,
`Bundang-gu, Seongnam-si, Gyeonggi-do,
`Korea
`
`Continuation to last page
`
`
`
`
`
`FRINGE-FIELD SWITCHING LIQUID CRYSTAL DISPLAY
`
`
`
`
`
`
`
`(54) [Title of the Invention]
`
`(57) [Abstract]
`[Subject] To provide a fringe-field switching
`liquid crystal display where strain of liquid-
`crystal molecular orientation can be improved
`and generation of a rubbing trace at an edge part
`a pixel electrode and generation of a boundary
`line can be prevented, by changing the edge part
`the pixel electrode from a curved shape into a
`linear shape.
`In a fringe-field
`[Resolution Means]
`switching liquid crystal display having a
`structure where a black matrix 31 on an upper
`substrate 30 and an edge 25a of a pixel electrode
`25 on a lower substrate 20 are overlapped in a
`predetermined region, and liquid crystals are
`interposed between the upper substrate and the
`lower substrate, the edge part the pixel electrode
`is characterized by having a linear shape.
`[Selected diagram]
`Fig. 6
`
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`

`
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`JP 2005-107535 A 4/21/2005
`
`[CLAIMS]
`1. A fringe-field switching liquid crystal display, comprising a structure where a black matrix on an
`upper substrate and an edge part of a pixel electrode on a lower substrate are overlapped in a
`predetermined region and liquid crystals are interposed between the upper substrate and the lower
`substrate, wherein
`
`the edge part the pixel electrode comprises a linear shape.
`2. The fringe-field switching liquid crystal display according to claim 1, wherein
`
`the linear shape includes a wedge shape.
`3. The fringe-field switching liquid crystal display according to claim 1, wherein
`the linear shape comprises a structure where two “U”-shaped protrusions project in an opposite
`
`manner from each other.
`4. The fringe-field switching liquid crystal display according to claim 1, wherein
`
`the edge part the pixel electrode is increased in width toward its tip section.
`5. The fringe-field switching liquid crystal display according to claim 1, wherein
` while the edge part of the pixel electrode is aligned in a parallel direction relative to a central part of
`the pixel electrode, a tip section of the edge part is aligned by inclining at a predetermined angle relative
`to the central part.
`6. The fringe-field switching liquid crystal display according to claim 5, wherein
`
`the edge part of the pixel electrode is aligned by inclining at 5 to 9 degrees relative to the central part
`of the pixel electrode.
`7. The fringe-field switching liquid crystal display according to claim 1, wherein
`
`a tip section of the edge part the pixel electrode comprises a structure being bent at 9 to 12 degrees
`relative to the pixel electrode.
`
`8. The fringe-field switching liquid crystal display according to claim 1, wherein
`
`the edge part the pixel electrode comprises a compound angle composed of an angle that is greater
`than an angle formed by a central part of the pixel electrode and a rubbing direction and another angle
`that is smaller than the angle formed the central part of the pixel electrode and the rubbing direction.
`9. A fringe-field switching liquid crystal display, comprising a structure where a black matrix on an
`upper substrate and an edge part of a pixel electrode on a lower substrate are overlapped in a
`predetermined region and liquid crystals are interposed between the upper substrate and the lower
`substrate, wherein
`
`the edge part of the pixel electrode is aligned by inclining at a predetermined angle relative to a center,
`and comprises a linear shape.
`10. The fringe-field switching liquid crystal display according to claim 9, wherein
`
`a tip section of the edge part of the pixel electrode comprises a structure being bent at an angle of 9 to
`12 degrees relative to the edge part of the pixel electrode.
`11. The fringe-field switching liquid crystal display according to claim 9, wherein
`
`the edge part of the pixel electrode is increased in width toward the direction of one side of the edge
`part.
`12. The fringe-field switching liquid crystal display according to claim 9, wherein
`
`the edge part the pixel electrode is aligned by inclining at 5 to 9 degrees relative to a central part of
`the pixel electrode.
`[DETAILED DESCRIPTION OF THE INVENTION]
`[Technical Field]
`
`JAPAN DISPLAY INC. - EX. 2013
`TIANMA MICROELECTRONICS CO. LTD. v. JAPAN DISPLAY INC
`IPR2021-01058
`
`

`

`(3)
`
`
`
`
` JP 2005-107535 A 4/21/2005
`
`
`[0001]
`
`The present invention relates to a fringe-field switching liquid crystal display (hereafter, referred to as
`FFS-LCD), and in more detail, relates to a fringe-field switching liquid crystal display that can prevent
`generation of a display defect caused by varying a liquid-crystal alignment due to pressure caused by
`rubbing within the FFS-LCD pixel structure.
`[Background Technology]
`[0002]
` As generally known, a conventional thin-film liquid display (LCD) is used for information displays,
`such as an information display window of a portable terminal, a screen display of a notebook computer or
`a monitor of a laptop computer. In particular, the liquid crystal display is a display unit that can be
`replaced from an existing cathode-ray tube (CRT) type monitor, and its usability is industrially very high.
`[0003]
`
`Fig. 1 is a plan view showing FFS-LCD relating to prior art (for example, see Patent Literature 1).
`
`Further, Fig. 2 shows a shape of a pixel electrode, and a liquid crystalline state when an electric field
`is applied to the pixel electrode in a conventional FFS-LCD.
`[0004]
`
`The FFS-LCD relating to the prior art, as shown in Fig. 1, is equipped with a pixel electrode 7 on an
`upper surface of a common electrode 4, and the pixel electrode 7 is produced to be in a slit type.
`Further, although an edge part of the pixel electrode 7 should be formed so as to have a certain angle of
`inclination, in actuality, as shown in Fig. 2, it has a curved shape due to a limitation in an exposure
`process.
`
`In Fig. 1, non-described symbols 2, 3 and 5 & 6 in the drawing represent a gate line, a data line, and
`source & drain electrodes, respectively.
`[0005]
`
`Fig. 3 shows liquid crystalline states, and (a) shows a state where no electric field is applied to a pixel
`electrode, (b) shows a state where a high electric field has been applied, and (c) shows a defective state
`where misalignment has occurred due to strain of liquid-crystal molecular orientation on the occasion of
`high pressure and/or pressure upon rubbing.
`
`In the meantime, Fig. 4 is a drawing for explaining an issue relating to the prior art.
`[0006]
`
`The FFS-LCD relating to the prior art having the configuration above operates as follows:
`
`If an electric field is not generated in a common electrode and a pixel electrode, as shown in Fig. 3 (a),
`liquid crystals 8 are aligned in a horizontal direction. In Fig. 3 (a), an arrow direction indicates a rubbing
`direction.
`
`In the meantime, when a low electric field is applied, the liquid crystals shall slightly twist from the
`horizontal direction, and when an intermediate electric field is applied, the degree of twist becomes
`greater than the case of applying the low electric field.
`[0007]
`
`Further, when a high electric field is applied, as shown in Fig. 2 and Fig. 3 (b), a twist angle of the
`liquid crystals 8 becomes approximately 90 degrees as toward a tip section of an edge part of the pixel
`electrode having a curved shape due to interference of an electric field between a black matrix (not
`shown) and the pixel electrode 7, and these will be aligned in a vertical direction.
`On that occasion, because pressure caused by rubbing is impacted, as shown in Fig. 3 (c), a circle
`phenomenon at the edge part of the pixel electrode complicates mobility of the liquid crystals
`
`JAPAN DISPLAY INC. - EX. 2013
`TIANMA MICROELECTRONICS CO. LTD. v. JAPAN DISPLAY INC
`IPR2021-01058
`
`

`

`(4)
`
`
`
`
` JP 2005-107535 A 4/21/2005
`
`
`corresponding to the applied voltage, and it causes a defect due to strain of liquid-crystal molecular
`orientation on the occasion of applying the pressure caused by rubbing in a white gradation.
`[0008]
`
`In other words, when the pressure caused by rubbing in the white gradation is applied, as shown in
`Fig. 3 (c) and Fig. 4, there is a problem where the liquid-crystal molecular orientation will not be restored
`to an initial state, and a trace of rubbing, i.e. a disclination line 9 will be generated.
`[0009]
`
`[Patent Literature] Publication of Unexamined Japanese Patent Application 2002-014363
`[DISCLOSURE OF THE INVENTION]
`[Problem to be Solved by the Invention]
`[0010]
`
`Then, the present invention has been accomplished in view of problem areas in the conventional
`fringe-field switching liquid crystal display, and the objective of the present invention is to provide a
`fringe-field switching liquid crystal display where strain of liquid-crystal molecular orientation can be
`improved and the generation of a rubbing trace at an edge part of a pixel electrode or generation of a
`boundary line can be prevented, by changing the edge part the pixel electrode from a curved shape into a
`linear shape.
`[Means for Solving the Problem]
`[0011]
`
`The fringe-field switching liquid crystal display according to the present invention invented in order
`to accomplish the objective is, in a fringe-field switching liquid crystal display having a structure where a
`black matrix of an upper substrate and an edge part a pixel electrode in a lower substrate are overlapped
`in a predetermined region and liquid crystals are interposed between the upper substrate and the lower
`substrate, is characterized such that the edge part the pixel electrode has a linear shape.
`[0012]
`
`The linear shape is characterized by including a wedge shape.
`The linear shape is characterized by including a structure where two “U”-shaped protrusions project
`
`in an opposite manner from each other.
`
`The edge part the pixel electrode is charactering by being increased in width toward its tip section.
`
`It is characterized such that while the edge part of the pixel electrode is aligned in a parallel direction
`relative to a central part of the pixel electrode, a tip section of the edge part is aligned by inclining at a
`predetermined angle relative to the central part.
`[0013]
`
`The edge part of the pixel electrode is characterized by being aligned by inclining at 5 to 9 degrees
`relative to the central part of the pixel electrode.
` A tip section of the edge part the pixel electrode is characterized by having a structure being bent at 9
`to 12 degrees with respect to the pixel electrode.
`
`The edge part the pixel electrode is characterized by having a compound angle composed of an angle
`that is greater than an angle formed by a central part of the pixel electrode and a rubbing direction and
`another angle that is smaller than the angle formed the central part of the pixel electrode and the rubbing
`direction.
`[0014]
`
`Further, the fringe-field switching liquid crystal display according to the present invention invented in
`order to accomplish the objective is, in a fringe-field switching liquid crystal display having a structure
`
`JAPAN DISPLAY INC. - EX. 2013
`TIANMA MICROELECTRONICS CO. LTD. v. JAPAN DISPLAY INC
`IPR2021-01058
`
`

`

`(5)
`
`
`
`
` JP 2005-107535 A 4/21/2005
`
`
`where a black matrix on an upper substrate and an edge part of a pixel electrode on a lower substrate are
`overlapped in a predetermined region and liquid crystals are interposed between the upper substrate and
`the lower substrate, is characterized such that the edge part of the pixel electrode is aligned by inclining at
`a predetermined angle with respect to a center, and has a linear shape.
`[0015]
` A tip section of the edge part of the pixel electrode is characterized by having a structure being bent at
`an angle of 9 to 12 degrees with respect to the edge part of the pixel electrode.
`
`The edge part of the pixel electrode is characterized by being increased in width toward the direction
`of one side of the edge part.
`
`The edge part the pixel electrode is characterized by being aligned by inclining at 5 to 9 degrees
`relative to a central part of the pixel electrode.
`[Effect of the Invention]
`[0016]
`
`The fringe-field switching liquid crystal display relating to the present invention has effects to enable
`stable driving of liquid crystals at an edge part of a pixel electrode, and, to enable early restoration of
`movement of the liquid crystals, on the occasion of application in the white gradation, by changing the
`structure of the edge part of the pixel electrode.
`
`In addition, when external physical force, such as rubbing, is applied, it has effects to reduce the
`strain of liquid-crystal molecular orientation, and not to generate a trace of rubbing nor a boundary line,
`and to improve response speed of the liquid crystals as a result.
`[Best Mode for Carrying Out the Invention]
`[0017]
` Next, a specific example of a best mode for carrying the fringe-field switching liquid crystal display
`relating to the present invention will be described with reference to drawings.
`[0018]
`
`Fig. 5 is a cross-sectional view of the fringe-field switching liquid crystal display relating to the
`present invention.
`
`The fringe-field switching liquid crystal display relating to the present invention, as shown in Fig. 5,
`has a structure that is equipped with a common electrode 21 on a lower substrate 20 and a pixel electrode
`25 on an upper surface of the common electrode 21, and that is equipped with a black matrix 31 on the
`upper substrate 30, and where the black matrix 31 on the upper substrate 30 and the edge part of the pixel
`electrode 25 on the lower substrate 20 are overlapped in a predetermined region, and liquid crystals (not
`shown) are interposed between both of these substrates.
`[0019]
`
`The edge part of the pixel electrode 25 has a linear shape. On that occasion, the material of the pixel
`electrode 25 includes transparent conducting oxide (TCO), metal, sol- or gel-state metal, and high-
`conductivity polymer.
`[0020]
`
`Fig. 6 is a plan view, in the FFS-LCD relating to the present invention, simply showing a shape of the
`edge part of the pixel electrode relating to First Embodiment.
` As First Embodiment of a linear shape of an edge 25a of the pixel electrode 25, as shown in Fig. 6, a
`wedge shape ‘a’ is cited. The edges of the pixel electrodes 25 having the wedge shape ‘a’, as shown in
`Fig. 6, can be aligned by placing in a line relative to a central part of the pixel electrodes 25, and can also
`be aligned by inclining at a predetermined angle relative to the central part of the pixel electrodes (not
`
`JAPAN DISPLAY INC. - EX. 2013
`TIANMA MICROELECTRONICS CO. LTD. v. JAPAN DISPLAY INC
`IPR2021-01058
`
`

`

`(6)
`
`
`
`
` JP 2005-107535 A 4/21/2005
`
`
`shown).
`[0021]
`
`Figs. 7 and 8 are plan views, in the FFS-LCD relating to the present invention, simply showing
`shapes of the edges of the pixel electrodes relating to Second Embodiment.
`
`Second Embodiment of the linear shape of the edge 25a of the pixel electrode 25, as shown in Fig. 7,
`includes a structure where “U”-shaped portions ‘b’ project in both side directions from each other. The
`structure where the “U”-shaped portion ‘b’ projects, as shown in Fig. 8, can be aligned so as to incline
`toward one side.
`[0022]
`
`Fig. 9 is a plan view, in the FFS-LCD relating to the present invention, simply showing a shape of the
`edge part the pixel electrode relating to Third Embodiment.
`
`Third Embodiment of the linear shape of the edge 25a of the pixel electrode 25, as shown in Fig. 9, is
`formed to be a structure ‘c’ where one side is inclined.
`[0023]
`
`Fig. 10 is a plan view, in the FFS-LCD relating to the present invention, simply showing a shape of
`the edge part the pixel electrode relating to Fourth Embodiment.
`
`Fourth Embodiment of the linear shape of the edge 25a of the pixel electrode 25, as shown in Fig. 10,
`includes a structure where an end is bent at an angle of 9 to 12 degrees while the edges 25a are aligned in
`a parallel direction relative to the central part of the pixel electrodes.
`
`[0024]
`
`Fig. 11 is a plan view, in the FFS-LCD relating to the present invention, simply showing a shape of
`the edge part the pixel electrode relating to Five Embodiment.
`
`Fifth Embodiment of the linear shape of the edge 25a of the pixel electrode 25, as shown in Fig. 11,
`includes a structure where its width (W) becomes wider as toward the end, and is formed to be an inclined
`structure at an angle of 5 to 9 degrees relative to the central part of the pixel electrode.
`[0025]
` Here, Fifth Embodiment of the edge part the pixel electrode demonstrates greater restoring force of
`liquid crystals than that of Forth Embodiment because of having the inclined structure at an angle of 5 to
`9 degrees. Therefore, in the white gradation, the liquid crystals in the vicinity of the edge part the pixel
`electrode are stabilized.
`[0026]
`
`The embodiments of the edges of the pixel electrodes relating to the present invention above fulfill
`roles to solve issues of twisting speed elastomeric force of the liquid crystals from the edge part the pixel
`electrode and to stabilize the liquid crystals, compared to the existing curved shape.
`[0027]
`
`The FFS-LCD relating to the present invention having the structures as described above operates as
`follows:
` When no electric field is applied, liquid crystal molecules are horizontally aligned; and when a high
`electric field is applied, a twist angle of the liquid crystal molecules becomes approximately 90 degrees as
`toward the center part from the end of the edge part of the pixel electrode due to interference of the
`electric field between the black matrix and the pixel electrode, and will be aligned in a vertical direction.
`In this case, since pressure caused by rubbing impacts on the alignment, restoring force of the liquid
`crystals and deflecting force of the liquid crystals at the edge part of the pixel electrode are increased by
`having a linear shape in the edge part the pixel electrode. Therefore, in the white gradation, on the
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`JAPAN DISPLAY INC. - EX. 2013
`TIANMA MICROELECTRONICS CO. LTD. v. JAPAN DISPLAY INC
`IPR2021-01058
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` JP 2005-107535 A 4/21/2005
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`occasion of generating pressure, the liquid-crystal molecular orientatio