WO2008004358A1 - Composant optique, panneau d'affichage, dispositif d'affichage et procédé pour placer un repère d'identification sur un composant optique - Google Patents

Composant optique, panneau d'affichage, dispositif d'affichage et procédé pour placer un repère d'identification sur un composant optique Download PDF

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Publication number
WO2008004358A1
WO2008004358A1 PCT/JP2007/055024 JP2007055024W WO2008004358A1 WO 2008004358 A1 WO2008004358 A1 WO 2008004358A1 JP 2007055024 W JP2007055024 W JP 2007055024W WO 2008004358 A1 WO2008004358 A1 WO 2008004358A1
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WO
WIPO (PCT)
Prior art keywords
optical member
liquid crystal
crystal display
polarizing sheet
display device
Prior art date
Application number
PCT/JP2007/055024
Other languages
English (en)
Japanese (ja)
Inventor
Kouji Kusuda
Original Assignee
Sharp Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Kabushiki Kaisha filed Critical Sharp Kabushiki Kaisha
Publication of WO2008004358A1 publication Critical patent/WO2008004358A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3016—Polarising elements involving passive liquid crystal elements
    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • 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
    • G02F1/133374—Constructional arrangements; Manufacturing methods for displaying permanent signs or marks

Definitions

  • the present invention relates to an optical member such as a polarizing sheet or a diffusion sheet used in a display device such as a liquid crystal display device.
  • FIG. 7 shows an exploded perspective view of a general liquid crystal display device.
  • a polarizing sheet 94a which is a kind of the optical member described above, is provided on the front and back surfaces of a liquid crystal display panel 92 disposed between an outer frame 91 and an inner frame 93 of a liquid crystal display device 90. , 94b is attached. Further, between the liquid crystal display panel 92 and the light source 96 that irradiates it from the back side, a diffusion sheet as an optical member and an optical sheet 98 such as a lens sheet are overlapped and arranged.
  • such an optical member is selected according to the function, grade, and the like of the liquid crystal display device to be manufactured, and various kinds of optical members are used in combination in accordance with desired characteristics.
  • the optical materials are almost the same regardless of the type of material, and if the screen size of the liquid crystal display device is the same, the size is almost the same, so the appearance is completely indistinguishable. Many Therefore, in an assembly line of a liquid crystal display device on which various types of optical members are placed, there is a problem that an operator mistakenly uses an optical member for another liquid crystal display device.
  • the optical members are generally cut into a corner of the optical member within a range that does not affect the image display unit of the liquid crystal display device. And was identified by the presence or absence of the cut.
  • the types of optical members used in the liquid crystal display device assembly line are also increasing. Cutting corners
  • Japanese Patent Application Laid-Open No. 2000-321422 discloses a protective film for a separator that protects the surface of an optical member and an adhesive layer and is peeled off when incorporated in a liquid crystal display device.
  • ink By applying ink as information to identify the optical member on the surface, it was possible to visually identify them even in the assembly line of liquid crystal display devices with a wide variety of optical members. The technology is disclosed.
  • the problem to be solved by the present invention is to make it possible to always recognize the type of optical member such as a polarizing sheet and a diffusion sheet used in a display device or a display panel.
  • the purpose is to improve the accuracy of work and the reliability of quality when assembling to equipment and display panels.
  • an optical member according to the present invention is a sheet-like or plate-like optical member, and an identification display relating to type information is locally or entirely attached to a side surface of the optical member. It is a summary.
  • the identification display may be provided at a position shifted from the central axis of the surface of the optical member.
  • the identification display may be made by applying a paint or ink to the side surface of the optical member.
  • the paint or ink may be a fluorescent paint or fluorescent ink.
  • the identification display may be provided by deformation or modification of a side surface of the optical member.
  • a display panel or a display device including such an optical member is configured. And good. In addition, it is good to configure as a display device provided with a plurality of such optical members, and the position of the identification display of each of these optical members is substantially near.
  • a plurality of the same type of sheet-like or plate-like optical members are stacked in a laminated state, and the optical member is placed on the side surface thereof. It is preferable that the group type information is added.
  • the optical member of the present invention by attaching an identification display to the side surface of the optical member, it is possible to visually identify a large number of types of optical members by changing the color and size, for example. it can. Further, even after the protective film of the optical member is peeled off and assembled to a predetermined place, the optical member still has an identification display, so that the type of the optical member can be easily determined. In addition, since the identification display is attached to the side surface of the optical member, there is no adverse effect on the video display displayed on the display panel, and it can be used without being influenced by the size of the frame of the display device.
  • the identification display is attached at a position shifted from the center axis of the surface of the optical member, it is impossible to visually determine the top and bottom or the front and back. Even so, the position of the identification display can be used as a guide, and the top, bottom, left, and back of the optical member can be distinguished. Further, if the identification display is given by application of paint or ink, it is possible to easily give the identification display to the optical member. In addition, if the paint or ink is fluorescent paint or fluorescent ink, the type of optical member can be easily identified even when inspection after assembly is performed in a dark room, and the cause of defects in the inspection process can be identified. It leads to quick ⁇ . Furthermore, if the identification display is provided by deformation or modification of the side surface of the optical member, there is no problem that the identification display disappears for some reason, as in the case where the identification display is applied with paint.
  • each optical member is normally used in the display device assembly process. When the members are stacked, the identification indications are arranged in a line almost vertically, so that the operator can assemble the identification indication positions of other optical members as a guideline, and easily find mistakes. .
  • FIG. 1 is a perspective view showing three types of polarizing sheets according to an embodiment of the present invention.
  • FIG. 2 is a diagram schematically showing a cross section of a general polarizing sheet used in a liquid crystal display device.
  • FIG. 3 shows a state of sticking of the polarizing sheet according to one embodiment of the present invention, wherein (a) shows a case where the sticking direction of the polarizing sheet according to one embodiment of the present invention is correct, and (b) shows a sticking direction of the polarizing sheet. It shows the case where it is pasted upside down. (c) shows the case where the identification display is attached on the central axis of the surface of the polarizing sheet.
  • FIG. 4 is a perspective view showing a method for producing a polarizing sheet according to an embodiment of the present invention.
  • FIG. 5 is an exploded perspective view showing a schematic configuration of a liquid crystal display device including an optical member according to the present invention.
  • FIG. 6 is a perspective view showing a method for giving an identification display by thermally deforming a polarizing sheet according to an embodiment of the present invention.
  • FIG. 7 is an exploded perspective view showing a schematic configuration of a liquid crystal display device generally used conventionally.
  • the polarizing sheets 94a and 94b which are examples of the optical member according to the embodiment of the present invention, are used for the liquid crystal display panel 92 in which liquid crystal is filled between a pair of glass substrates. Used by being affixed to the front and back surfaces and irradiated from the light source 96 through the optical sheet 98. It has the function of extracting only the light that vibrates in a certain direction from the light that vibrates in the direction.
  • FIG. 1 shows, as an example, three types of polarizing sheets having identification indications on side surfaces according to an embodiment of the present invention.
  • the polarizing sheets 10a to 10c according to the present invention are marked with identification marks with fluorescent paints at a plurality of positions on the side surfaces, and the fluorescent paints are used for the types and applications of the polarizing sheets.
  • the colors are different accordingly.
  • the polarizing sheet 10a shown in FIG. 1 (a) is marked with a mark A indicating the model name of the liquid crystal display device in which the polarizing sheet 10a is used and a mark B indicating the manufacturer of the polarizing sheet.
  • the polarizing sheet 10b shown in FIG. 1 (b) is provided with a mark A indicating the model name of the liquid crystal display device used and a mark indicating the name of the polarizing sheet manufacturer.
  • the polarizing sheet 10c shown in FIG. 1 (c) is marked with a mark indicating the model name of the liquid crystal display device used and a mark indicating the manufacturer name of the polarizing sheet.
  • the polarizing sheets 10a and 10b shown in FIGS. 1 (a) and 1 (b) are given the same mark A as the model name identification display of the liquid crystal display device used. Although it is used for display devices, it is used for the same liquid crystal display device because the identification mark of the manufacturer of the polarizing sheet manufacturer is marked with a different mark. It turns out that it is a made polarizing sheet.
  • the polarizing sheet 10c shown in FIG. 1 (c) is marked with a mark A 'different from the polarizing sheets 10a and 10b and the same mark as the polarizing sheet 10b, the polarizing sheet 10a , 1 Ob shows that the liquid crystal display device used is different, but it is a polarizing sheet made by the same manufacturer as the polarizing sheet 10b.
  • the mark C attached to the polarizing sheets 10b and 10c indicates that the polarizing sheet is attached to the front side (image display surface) of the liquid crystal display panel.
  • the liquid crystal display panel of the liquid crystal display device in which the polarizing sheets 10a and 10b are used has a mark C attached!
  • the polarizing sheet 10a has a mark C attached to the back side of the liquid crystal display panel. This indicates that the polarizing sheets 10b and 10c are attached to the front side of the liquid crystal display panel, and prevents the wrong attachment of the polarizing sheet in the liquid crystal display panel assembly process.
  • the type of the polarizing sheet can be identified.
  • the manufacturing sheet name information is given to the polarizing sheet, if a defective polarizing sheet is found, it is immediately divided into which manufacturer's polarizing sheet. It is effective for investigations.
  • information on the model name of the liquid crystal display device to be used is given, it is possible to produce many types of products in small quantities, so even if many models are made on the same assembly line, it is difficult to make a mistake in attaching the polarizing sheet. .
  • FIG. 2 showing a schematic diagram of a cross section of a general polarizing sheet will be described.
  • the polarizing sheet 10 has a configuration in which a polarizing film 22 that polarizes light from a light source such as a knocklight is sandwiched between a pair of substrate films 24a and 24b.
  • An adhesive 26 for attaching the polarizing sheet 10 to the liquid crystal display panel is applied to the lower surface of the substrate film 24b, and the adhesive 26 is protected by a separator 28.
  • the upper surface of the substrate film 24a is protected by a protective film 29.
  • These separator 28 and protective film 29 are affixed as protective sheets and are peeled off during the product assembly process.
  • the separator 28 and the protective film 29 that are peeled off are attached to both surfaces of a general polarizing sheet. Therefore, even if an identification display is attached to the surface of the polarizing sheet before assembly, if the separator 28 or the protective film 29 is peeled off during the assembly process, the identification display is also removed together with the separator 28 or the protective film 29. This makes it impossible to determine the type of polarizing sheet.
  • the identification display is also provided on a portion excluding the separator 28 and the protective film 29 that are peeled off. Therefore, even after the separator 28 and the protective film 29 are peeled off, the identification display remains on the polarizing sheet. For example, when a defect is detected in the lighting inspection of the liquid crystal display panel after the polarizing sheet is attached, the attached polarizing sheet is properly You can also check the identification when you confirm that it is.
  • the identification display is attached with fluorescent paint, even if this inspection process is performed in a dark room, the color of the mark and the presence or absence of the mark will not be mistaken or overlooked. In other words, defects occur during the inspection process. In such a case, it is difficult to judge visually, and there is an advantage that it is not necessary to judge the display quality of the liquid crystal display panel with a special device.
  • the identification method by providing the identification display is not limited to this. Absent. For example, the size, position, number, etc. of the marks may be changed according to the type of the polarizing sheet, or these may be combined.
  • the information given to the polarizing sheet is not limited to the manufacturer name and the model used.
  • an identification display may be given for each type of liquid crystal display panel. It is also possible to provide an identification display indicating the characteristics of each polarizing sheet.
  • fluorescent ink, ordinary paint (dye, pigment) or ink may be used instead of fluorescent paint.
  • the above-described identification display is uniformly attached to a position shifted from the central axial force on the surface of the polarizing sheet in consideration of the attaching direction of the polarizing sheet.
  • Fig. 3 (a) when the polarizing sheet 10b is attached to the liquid crystal display panel 32 in a specific direction and the polarizing sheet 10b is attached in the normal direction, the mark is displayed. Unify the places where the identification mark is attached so that the position is a specific position (A in the figure). With such a configuration, when the polarizing sheet 10b is attached upside down, the mark is not located at the position A as shown in FIG. 3 (b).
  • the mark position for identification display can be used as a guide, and it is possible to prevent the polarizing sheet from being affixed to the liquid crystal display panel in the reverse direction or upside down. it can.
  • the mark position can be used as a guide to set the polarizing sheet. Also, even if a sticking error as shown in Fig. 3 (b) occurs, the difference from the non-defective product is clear, so it is easy to find a defective product simply by confirming the mark position in the inspection process. it can.
  • this method cannot be used when the mark position of the identification display is symmetric with respect to the central axis of the surface of the polarizing sheet. For example, as shown in FIG. 3 (c), when the mark M is attached on the central axis X of the polarizing sheet 30, even when the polarizing sheet 30 is attached to the liquid crystal display panel 32 with the front and back reversed. Since the position of the mark M does not change from the case where it is correctly pasted, it cannot be judged from the mark position whether it is pasted in the correct direction.
  • FIG. 4 shows a schematic diagram of a method for producing a polarizing sheet according to the present embodiment.
  • the polarizing sheet according to the present embodiment has a configuration in which an identification display is attached to the side surface thereof, so that the state of the polarizing sheet laminate 40 in which the same kind of polarizing sheets 41 are laminated as shown in the drawing. Therefore, it can be created by applying paint or ink to the side surface at a time.
  • a brush 42 soaked with paint as shown in the figure may be used.
  • transfer using a plate soaked with ink or printing using an ink jet method is also acceptable.
  • the polarizing sheet is used as a specific example of the optical member according to the present invention.
  • the configuration of the present invention can be applied to various optical members. Yes. For example, in order to increase the brightness when the liquid crystal display panel is viewed from the front by condensing the light emitted from a diffusion plate, diffusion sheet, diffusion sheet, etc. that diffuses light with a light source power and makes the luminance distribution uniform.
  • the configuration of the present invention can also be applied to a lens sheet, a brightness increasing sheet for increasing the overall brightness including the brightness when the liquid crystal display panel is viewed from an oblique side, and the like.
  • the liquid crystal display device 50 mainly includes a liquid crystal display panel section 60 and a backlight unit 70 that irradiates the liquid crystal display panel section 60 from the back side.
  • the liquid crystal display panel 60 is attached with the polarizing sheets 64a and 64b according to the present invention having identification indications on the side surfaces on both sides of a liquid crystal display panel 62 filled with liquid crystal between a pair of glass substrates. It is arranged above the knock light unit 70 in a state of being sandwiched between a frame-shaped outer frame 52 and an inner frame 54.
  • the knocklight unit 70 includes a box-shaped metal base tray 56 having an open top surface, a plurality of tubular lamps 82 arranged in parallel in the base tray 56, and the tubular lamps 82. It is composed of a diffusion plate 72 laid to make the luminance distribution of the tubular lamp 82 uniform, and optical sheets 74, 76, 78 such as a diffusion sheet and a lens sheet disposed on the diffusion plate 72. ing.
  • the diffusion plate 72 is formed in a substantially rectangular shape that is substantially the same as the optical sheets 74, 76, 78.
  • the diffusing plate 72 has a slightly thick transparent plate shape and is less prone to stagnation when placed, and the optical sheets 74, 76, and 78 placed thereon are almost flat. It can be supported flat.
  • the base tray 56 has an interior 80 for accommodating a plurality of tubular lamps 82, 82.
  • a peripheral edge 84 serving as a mounting allowance for mounting the diffusion plate 72 and the optical sheets 74, 76, 78 is formed with a predetermined thickness on the peripheral edge of the interior 80.
  • an upright part 86 is erected along the outer periphery to form a place on which the diffusion plate 72 and the optical sheets 74, 76, 78 are placed.
  • marks as identification indications are attached on the side surfaces of the optical members of the polarizing sheets 64a and 64b, the diffusing plate 72, and the optical sheets 74, 76, and 78.
  • the mark located at A in the figure indicates the model name of the liquid crystal display device used, and therefore the same mark is attached to all sheets.
  • the mark located at B in the figure is an identification display that indicates the name of the manufacturer of each optical member.
  • the presence / absence of the marks on the polarizing sheets 64a and 64b is an identification display indicating whether the polarizing sheets 64a and 64b are attached to the front surface or the back surface of the liquid crystal display panel 62.
  • the marks at the position C in the drawings of the optical sheets 74, 76, and 78 have different sizes. In other words, when correctly assembled into the liquid crystal display device as shown in the figure, they are arranged in the order of the ones with the largest mark C from the liquid crystal display panel 62 side, which is a guideline for the installation of the knock light unit 70! .
  • the identification display is given by applying paint or ink.
  • the identification unit or the identification unit is modified so that the property is visually different between the identification unit and the identification unit.
  • An indication can be formed.
  • the denaturation treatment include methods using heat, chemicals, high energy lasers, and the like.
  • a method for providing an identification display by heat treatment will be described with reference to FIG. Since an optical sheet is often composed of a resin, a method by heat treatment in which the heat distortion temperature is relatively low is simple.
  • the iron sheet 100 having an electric heating mechanism connected to the power source 104 via the power cord 102 on the side surface of the polarizing sheet laminate 40 in which the polarizing sheets 41 are laminated as shown in the figure The side surface of the polarizing sheet laminate 40 is locally modified. At this time, it is desirable that the temperature of the iron 100 is equal to or higher than the heat deformation temperature of the polarizing sheet 41.
  • the contact time of the iron 100 is adjusted so that the heat denaturation does not reach the display area inside the polarizing sheet 41.
  • the tip of the iron 100 may be formed in a concave-convex shape, and the side surface of the polarizing sheet 41 may be deformed in a concave-convex shape to give an identification display.
  • the identification display it is easy to change the identification display for each type of the polarizing sheet 41 if a plurality of tips 100 having different irregularities are prepared in advance.
  • the optical member according to the present invention described above identification of the model name to be used and an identification display that serves as a guide for the mounting position are attached. Type and installation position can be confirmed. Therefore, it is possible to reduce the mounting error of the optical member in the assembly process, improve the production efficiency of the liquid crystal display device, and improve the quality.
  • the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention.
  • the optical member used in the liquid crystal display device, and the liquid crystal display device using the optical member are used in the display device such as the force-elect's luminescence display or the plasma display.
  • the present invention can also be applied to a sheet-like or plate-like optical member. Further, the technical idea of the present invention can be applied to optical members other than those used in display devices, display panels, and the like.

Abstract

L'invention concerne un procédé d'identification simple de composants optiques dont le type ne peut pas être déterminé par une inspection visuelle. Celui-ci emploie un repère (A, A') indiquant un type d'afficheur à cristaux liquides pour lequel est utilisé le film polarisant, un repère (B, B') indiquant le fabricant du film polarisant, un repère (C) indiquant que le film polarisant est fixé sur la surface d'affichage vidéo (surface frontale) et similaires, les répères étant placés sur une surface latérale du film (10a, 10b, 10c) polarisant disposé sur un panneau de l'afficheur à cristaux liquides de sorte que le type de film polarisant peut être identifié même après avoir retiré un film protecteur et un séparateur.
PCT/JP2007/055024 2006-07-04 2007-03-14 Composant optique, panneau d'affichage, dispositif d'affichage et procédé pour placer un repère d'identification sur un composant optique WO2008004358A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006-184286 2006-07-04
JP2006184286 2006-07-04

Publications (1)

Publication Number Publication Date
WO2008004358A1 true WO2008004358A1 (fr) 2008-01-10

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013145845A (ja) * 2012-01-16 2013-07-25 Mitsubishi Electric Corp 太陽電池モジュールの製造方法
GB2569863A (en) * 2017-10-31 2019-07-03 Lg Display Co Ltd Display device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62109680A (ja) * 1985-10-31 1987-05-20 フエラク　ア−ゲ− シ−ト状紙製品へのマ−キング方法
JPH10221685A (ja) * 1997-02-05 1998-08-21 Toshiba Electron Eng Corp 液晶用光学フィルム及び液晶表示素子
JP2003322832A (ja) * 2002-05-08 2003-11-14 Matsushita Electric Ind Co Ltd 液晶パネルおよびその製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62109680A (ja) * 1985-10-31 1987-05-20 フエラク　ア−ゲ− シ−ト状紙製品へのマ−キング方法
JPH10221685A (ja) * 1997-02-05 1998-08-21 Toshiba Electron Eng Corp 液晶用光学フィルム及び液晶表示素子
JP2003322832A (ja) * 2002-05-08 2003-11-14 Matsushita Electric Ind Co Ltd 液晶パネルおよびその製造方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013145845A (ja) * 2012-01-16 2013-07-25 Mitsubishi Electric Corp 太陽電池モジュールの製造方法
GB2569863A (en) * 2017-10-31 2019-07-03 Lg Display Co Ltd Display device
US11217537B2 (en) 2017-10-31 2022-01-04 Lg Display Co., Ltd. Display device including identification number pattern
GB2569863B (en) * 2017-10-31 2022-01-19 Lg Display Co Ltd Display device

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