JP2008185870A - Electro-optical device, method for manufacturing the same, and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electro-optical device or the like excellent in reworkability, in which an optical member can be easily peeled from a glass substrate without degrading the display quality even when the glass substrate is made thinner. <P>SOLUTION: The electro-optical device is equipped with: a liquid crystal display panel having a liquid crystal layer held between first and second substrates essentially comprising glass; and polarizing plates (an optical member) stuck to the outer surfaces of the first and second substrates through pressure-sensitive adhesive layers. The pressure-sensitive adhesive layer shows weak adhesiveness to be peelable at peeling force of 0.001 to 0.16 (N/cm). Thereby, even when the thickness of each of the first and second substrates is as extremely thin as 0.3 mm or less, the polarizing plates can be easily peeled from the surfaces of the first and second substrates without inducing cracks or the like in the substrates. This increases the reworkability of the polarizing plates with respect to the first and second substrates and prevents decrease in the display quality. As the pressure-sensitive adhesive layer has photosetting or thermosetting characteristics, the polarizing plates can be reliably fixed at appropriate positions of the first and second substrates. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a structure of an electro-optical device suitable for use in displaying various information.

  Conventionally, various electro-optical devices represented by a liquid crystal device, an organic electroluminescence display device, a plasma display device, a field emission display device, and the like are known.

  A liquid crystal device as an example of such an electro-optical device usually includes a polarizing plate for transmitting light waves in a certain vibration direction. The polarizing plate is usually in the form of a film, and is used in a state where it is attached to a glass substrate constituting a liquid crystal device, for example.

  Here, the adhesion of the polarizing plate to the surface of the glass substrate is generally performed by sticking a polarizing plate, on which one side has been previously coated with an adhesive, to the surface of the glass substrate. However, in that case, foreign matter may be interposed between the polarizing plate and the glass substrate, and in that case, the display quality is caused by the occurrence of light leakage due to polarization disturbance due to the foreign matter or shielding of light by the foreign matter. Is greatly impaired.

  Therefore, conventionally, after attaching a polarizing plate to the surface of a glass substrate via an adhesive, the quality of the attached state is inspected, for example, a foreign object is interposed between the polarizing plate and the glass substrate. In such a case, the polarizing plate is peeled off from the surface of the glass substrate, the foreign matter is removed, and the polarizing plate is attached to the glass substrate again, thereby deteriorating the display quality. I try to deter that.

  By the way, such a liquid crystal device is suitably used as a display device in a portable device or the like. However, in recent years, such a portable device is required to be thin, and accordingly, the liquid crystal device is also highly demanded to be thin. Under such a background, in a recent liquid crystal device, a glass substrate to which a polarizing plate or the like is attached is becoming thinner. Thus, when the glass substrate is thinned, the strength of the glass substrate is reduced with the thinning.

  For this reason, when a sticking failure occurs due to the presence of foreign matter between the polarizing plate and the glass substrate as described above, the glass substrate having a thin thickness is used to remove the foreign matter. When the polarizing plate is peeled off from the surface, the peeling force at the time of peeling causes the glass substrate to crack, or the cell thickness (interval between the pair of glass substrates) changes to cause color unevenness. Inconveniences such as a significant decrease can occur.

  Patent Document 1 describes a display panel in which an optical filter having an antireflection function is attached to the front surface of a display substrate via a slightly adhesive layer. In this configuration, it is said that by using the slightly adhesive layer, a display panel having excellent repairability can be obtained even when the optical filter is bonded to the display substrate.

  Patent Document 2 discloses an optical pressure-sensitive adhesive used for pressure-sensitive adhesive optical films and the like, and is formed using an optical pressure-sensitive adhesive excellent in both durability and peelability, and the optical pressure-sensitive adhesive. A method is described in which an optical film bonded to an adherend such as a liquid crystal cell substrate is easily peeled from the adherend through the adhesive layer formed.

JP 2004-347655 A JP 2006-257221 A

  The present invention has been made in view of the above points, and by reducing the thickness of a glass substrate to which an optical member such as a polarizing plate is attached, the optical member can be easily removed from the glass substrate without impairing display quality. It is an object of the present invention to provide an electro-optical device and the like excellent in reworkability that can be peeled off.

  In one aspect of the present invention, an electro-optical device includes an electro-optical panel having a pair of substrates formed of a glass-based material, and an electro-optical material sandwiched between the pair of substrates. An optical member attached to at least one of the pair of substrates via an adhesive layer, the adhesive layer having a peel force of 0.001 to 0.16 (N / cm). In addition to having slight adhesiveness that can be peeled off, it has a curing property that is cured by light or heat.

  The electro-optical device includes an electro-optical panel having a pair of substrates formed of a glass-based material, an electro-optical material sandwiched between the pair of substrates, and the pair of substrates. And an optical member attached to at least one of the substrates via an adhesive layer. Here, a polarizing plate etc. are mentioned as an optical member.

  In this electro-optical device, in particular, the adhesive layer has slight adhesiveness that can be peeled off with a peeling force of 0.001 to 0.16 (N / cm).

  Here, when the peeling force of the adhesive layer becomes smaller than 0.001 (N / cm), the adhesive layer does not function as an original adhesive layer, and the peeling force of the adhesive layer is 0.16 ( N / cm), when the thickness of the substrate is small, the substrate is cracked by the peeling force when the optical member is peeled from the surface of the substrate, or a part of the adhesive layer is formed on the surface of the substrate. Or the cell thickness (interval between a pair of substrates, the same applies hereinafter) changes to cause color unevenness, resulting in a significant reduction in display quality.

  Therefore, in the present embodiment, as a suitable example, the thickness of the substrate is as extremely thin as 0.3 mm or less, and even if the strength of the substrate is not so great, the substrate is not cracked. Further, the optical member can be easily peeled from the surface of the substrate without attaching a part of the adhesive layer to the surface of the substrate and without changing the cell thickness. As a result, after the optical member is peeled off, the optical member can be attached again to an appropriate position of the substrate, and the reworkability of the optical member with respect to the substrate can be improved. Therefore, it is possible to prevent the display quality from deteriorating.

In addition, the pressure-sensitive adhesive layer has a curing property that is cured by light or heat. In a preferred example, the pressure-sensitive adhesive layer 17 preferably has a curing property that is photocured by a light irradiation amount of 1000 mJ / cm ² or more, or heat-cured by a heating temperature of 80 ° C. or more and a heating time of 20 minutes or more. As a result, the optical member can be reliably fixed at an appropriate position on the substrate.

  In one aspect of the electro-optical device, another optical member is attached to the optical member via another adhesive layer having the same properties as the adhesive layer. Here, as another optical member, for example, a phase difference plate, a touch panel, or a cover film for protecting the surface of the electro-optical device may be used.

  Thereby, when the pasting failure of other optical members occurs with respect to the optical member, without causing the crack of the substrate, without peeling the optical member from the surface of the substrate, Other optical members can be easily peeled from the optical member without attaching a part of the adhesive layer to the surface of the optical member and without changing the cell thickness. As a result, after the other optical member is peeled off, the other optical member can be attached again to an appropriate position of the optical member, and the reworkability of the other optical member with respect to the optical member is improved. be able to. Therefore, it is possible to prevent the display quality from deteriorating.

  In another aspect of the present invention, an electronic apparatus including the electro-optical device as a display unit can be configured.

In still another aspect of the present invention, an electro-optical device manufacturing method includes a pair of substrates formed of a glass-based material and an electro-optic material sandwiched between the pair of substrates. Among the pair of substrates in the optical panel, at least one substrate has fine adhesiveness that can be peeled off with a peeling force of 0.001 to 0.16 (N / cm), and 1000 mJ / cm ² or more. An optical member provided on one surface with an adhesive layer having a curing property that is photocured according to the amount of light irradiation or heat cured at a heating temperature of 80 ° C. or higher and a heating time of 20 minutes or longer, via the adhesive layer A pasting step, an inspection step for inspecting whether the optical member is attached to the substrate, and a state in which the attaching state is defective in the inspection step. If the separation step of separating the optical member from the substrate by peeling force N / cm), said attachment state in the inspection process is good, the adhesive at 1000 mJ / cm ² or more light dose A pressure-sensitive adhesive layer curing step for curing the pressure-sensitive adhesive layer by irradiating the layer with light or heating the pressure-sensitive adhesive layer at a heating temperature of 80 ° C. or higher and a heating time of 20 minutes or longer. .

In the above-described method for manufacturing an electro-optical device, first, in the attaching step, an electric having a pair of substrates formed of a material mainly composed of glass and an electro-optical material sandwiched between the pair of substrates. Among the pair of substrates in the optical panel, at least one substrate has fine adhesiveness that can be peeled off with a peeling force of 0.001 to 0.16 (N / cm), and 1000 mJ / cm ² or more. An optical member (for example, a polarizing plate) provided with an adhesive layer having a curing property that is photocured depending on the amount of light irradiation, or cured at a heating temperature of 80 ° C. or higher and a heating time of 20 minutes or longer. Is pasted through the adhesive layer.

  Next, in the inspection step, the quality of the optical member attached to the substrate is inspected for quality. In this inspection process, an inspection is performed to determine whether or not the optical member is affixed to an appropriate position on the substrate, or whether or not foreign matter is present between the substrate and the optical member.

  Next, when the pasting state is poor in the inspection step, a peeling step is performed. On the other hand, when the pasting state is good in the inspection step, an adhesive layer curing step is performed.

  Here, in the peeling step, the optical member is peeled from the substrate with a peeling force of 0.001 to 0.16 (N / cm). As a result, even if the thickness of the substrate is extremely thin, for example, 0.3 mm or less, and the strength of the substrate is not so great, the substrate is not cracked and is not adhered to the surface of the substrate. The optical member can be easily peeled from the substrate without attaching a part of the layer and without changing the cell thickness. As a result, after the optical member is peeled off, it becomes possible to carry out the above-described attaching step of attaching the optical member to an appropriate position of the substrate again, thereby improving the reworkability of the optical member with respect to the substrate. be able to. Therefore, it is possible to prevent the display quality from deteriorating.

In the adhesive layer curing step, the adhesive layer is irradiated by irradiating the adhesive layer with a light irradiation amount of 1000 mJ / cm ² or more, or at a heating temperature of 80 ° C. or more and a heating time of 20 minutes or more. The adhesive layer is cured by heating. As a result, the optical member can be reliably fixed at an appropriate position on the substrate.

  In a preferred example of the method for manufacturing the electro-optical device, in response to a request for thinning the electro-optical device, each of the pair of substrates is formed to a thickness of 0.3 mm or less as a pre-process of the attaching step. It is preferable to further include a substrate manufacturing step to be formed on the substrate. Moreover, it is preferable to further include a foreign matter removing step for removing the foreign matter when the foreign matter is interposed between the one surface of the substrate and the adhesive layer as the next step of the peeling step.

  Hereinafter, various preferred embodiments of the present invention will be described with reference to the drawings. Various embodiments described below apply the present invention to a liquid crystal device as an example of an electro-optical device.

[Configuration of liquid crystal device]
First, the configuration of the liquid crystal device 100 according to the present embodiment will be described with reference to FIGS. 1 and 2.

  FIG. 1 is a plan view schematically showing a planar configuration of a liquid crystal device 100 according to the present embodiment as viewed from an observation side visually recognized by an observer. In FIG. 1, a color filter substrate 92 is disposed on the front side (observation side) of the paper, and an element substrate 91 is disposed on the back side of the paper. In FIG. 1, regions corresponding to R (red), G (green), and B (blue) colors represent one sub-pixel region SG, and 1 row × 3 columns corresponding to R, G, B The sub-pixel region SG indicates one display region G that is a minimum unit for color display. An area in which one display area G is arranged in a matrix is an effective display area V (area surrounded by a two-dot chain line). In the effective display area V, images such as letters, numbers, and figures are displayed. FIG. 2 is a cross-sectional view illustrating a cross-sectional configuration of the liquid crystal device 100 taken along the cutting line A-A ′ of FIG. 1.

  The liquid crystal device 100 has a role of transmitting light waves in a certain vibration direction with a liquid crystal display panel (electro-optical panel) 50, and a pair of polarizing plates (optical members) provided at positions sandwiching the liquid crystal display panel 50 ) 10 and 11, and a backlight 13 as an illuminating device disposed outside the polarizing plate 11. Here, the liquid crystal device 100 according to the present embodiment is a transmissive liquid crystal device for color display configured using colored layers of three colors of R, G, and B, and α− as an example of a switching element. This is an active matrix driving type liquid crystal device using Si type TFT elements. However, in the present invention, there is no limitation on the display method and driving method of the liquid crystal device.

  In the liquid crystal display panel 50, an element substrate 91 and a color filter substrate 92 disposed so as to face the element substrate 91 are bonded together via a frame-shaped sealing material 5, and liquid crystal is formed in a region partitioned by the sealing material 5. The liquid crystal layer 4 is formed by being sealed.

  First, the configuration of the element substrate 91 is as follows.

  The element substrate 91 mainly includes a first substrate 1 made of a material mainly composed of glass, a plurality of source lines 32 formed on or mounted on the inner surface of the first substrate 1, and a plurality of source lines 32. It has a gate line 33, a plurality of α-Si TFT elements 21, a plurality of pixel electrodes 10, a driver IC 40, and an external connection wiring 35. In this specification, the term “inner surface” means a surface located on the liquid crystal layer 4 side, and the term “outer surface” means a surface located on the opposite side of the liquid crystal layer 4. And

  The thickness d1 of the first substrate 1 is set to 0.3 mm or less, more preferably 0.2 mm or less, in accordance with a request for thinning the liquid crystal device 100. The first substrate 1 has a projecting portion 36 that projects outward from one side of the second substrate 2 that is an element of the color filter substrate 92, and the projecting portion 36 is used for driving the liquid crystal. A driver IC 40 is mounted. A terminal (not shown) on the input side of the driver IC 40 is electrically connected to one end side of the plurality of external connection wirings 35 and the other end side of the plurality of external connection wirings 35 is an FPC (Flexible Printed Circuit). ) It is electrically connected to a wiring board represented by 41 or the like.

  Each source line 32 is formed on the inner surface of the first substrate 1 at an appropriate interval in the longitudinal direction of the driver IC 40, and further formed so as to extend from the projecting portion 36 to the effective display region V side. ing. One end side of each source line 32 is electrically connected to a terminal (not shown) on the output side of the driver IC 40, and a source signal corresponding to the display content is supplied to each source line 32 through the driver IC 40.

  Each gate line 33 is formed on the inner surface of the first substrate 1 and extends from the projecting portion 36 side to the frame region 38 between the effective display region V and the seal material 5. And a second wiring 33b formed on the inner surface of the first substrate 1 and extending from the terminal portion of the first wiring 33a to the effective display region V side. One end side of each first wiring 33 a is electrically connected to a terminal (not shown) on the output side of the driver IC 40, and a gate signal is supplied to each gate line 33 through the driver IC 40.

  Each α-Si type TFT element 21 is a switching element and is provided on the inner surface of the first substrate 1 and corresponding to the intersection position of each source line 32 and each gate line 33 of the second wiring 33b. ing.

  Each pixel electrode 10 is formed of a transparent conductive material such as ITO (Indium-Tin Oxide), and is formed on the inner surface of the first substrate 1 corresponding to each sub-pixel region SG. Each pixel electrode 10 is electrically connected to each source line 32 and each gate line 33 through each α-Si TFT element 21.

  An alignment film (not shown) is formed on the inner surfaces of the source lines 32, the gate lines 33, the α-Si TFT elements 21, the pixel electrodes 10, and the like.

  Next, the configuration of the color filter substrate 92 is as follows.

  The color filter substrate 92 is mainly composed of a second substrate 2 formed of a material mainly composed of glass, a light-shielding BM (black matrix), R (red), G (green), and B (blue). 3) of colored layers 6R, 6G, and 6B, a protective layer 7, and a common electrode 8 to which a predetermined common potential is supplied.

  The second substrate 2 is set to have a thickness d2 of 0.3 mm or less, more preferably 0.2 mm or less, in accordance with a request for thinning the liquid crystal device 100.

  The BM is formed on the inner surface of the second substrate at a position that divides each sub-pixel region SG. The colored layers 6R, 6G, and 6B are formed on the inner surface of the second substrate at positions corresponding to the R, G, and B sub-pixel regions SG. On the inner surfaces of the BM and the colored layers 6R, 6G, 6B, a protective layer 7 having insulating properties and translucency is formed. A common electrode 8 made of a transparent conductive material such as ITO is formed on the inner surface of the protective layer 7. The common electrode 8 is electrically connected to one end side of the wiring 15 formed on the inner surface of the first substrate 1 in the corner area E1 of the sealing material 5, and the other end side of the wiring 15 is The driver IC 40 is electrically connected to the COM terminal (grounding terminal). An alignment film (not shown) is formed on the inner surface of the common electrode 8 or the like.

In the liquid crystal device 100 having the above configuration, based on the signal and power, etc. from the FPC41 side which is an electronic apparatus electrically connected to be described later, the driver _{IC40, G 1, G 2,} ···, G m-1 , G _m (where m is a natural number), the gate lines 33 are selected one by one in order, and the selected gate line 33 is supplied with a gate signal of the selected voltage, while the other non-selected The gate line 33 is supplied with a gate signal having a non-selection voltage. Then, the driver IC 40 applies source signals corresponding to display contents to the pixel electrodes 10 located at positions corresponding to the selected gate lines 33, respectively, corresponding to S ₁ , S _{2 ,. 1} , S _n (n is a natural number) source line 32 and α-Si type TFT element 21. As a result, the alignment state of the liquid crystal layer 4 is controlled, and the display state of the liquid crystal device 100 is switched to the non-display state or the intermediate display state. Thereby, a desired image can be displayed in the effective display area V. Here, when transmissive display is performed in the liquid crystal device 100, the illumination light T emitted from the illumination device 13 travels along the arrow direction in FIG. 2, and the pixel electrode 10 and three colors of R, G, and B Through the colored layers 6R, 6G, 6B, etc. to the observation side. Thus, a desired color display image is visually recognized by the observer.

(Attaching structure of polarizing plate to first or second substrate)
Next, a structure for attaching a polarizing plate to the first substrate 1 or the second substrate 2 that characterizes the present invention will be described. Hereinafter, when it is not necessary to distinguish between the polarizing plates 10 and 11, they are simply referred to as “polarizing plates”.

As shown in FIG. 2, the polarizing plate 11 includes an adhesive layer 17 on one surface, and is attached to the outer surface of the first substrate 1 via the adhesive layer 17. Is provided with an adhesive layer 17 on one surface, and is stuck on the outer surface of the second substrate 2 via the adhesive layer 17. In particular, the pressure-sensitive adhesive layer 17 has fine adhesiveness that can be peeled off with a peeling force of 0.001 to 0.16 (N / cm), and has curing characteristics that are cured by light or heat. In a preferred example, the adhesive layer 17 is preferably formed of a material such as a thermosetting resin such as an epoxy resin or a polyurethane resin, or a photocurable resin such as a silicone resin or an acrylic resin. Moreover, it is preferable that the adhesion layer 17 has the hardening characteristic which carries out photocuring by the light irradiation amount of 1000 mJ / cm < ² > or more, or thermosetting by the heating temperature of 80 degreeC or more and the heating time of 20 minutes or more.

  According to such a structure for attaching a polarizing plate to the first substrate 1 or the second substrate 2, the following specific effects can be obtained as compared with the comparative example assumed below.

  First, the comparative example is different from the above-described embodiment in that the peeling force of the adhesive layer provided on one surface of the polarizing plate is larger than 0.16 (N / cm) and does not have fine adhesiveness. The configuration of is the same as that of the present embodiment.

  In the comparative example, in the step of attaching the polarizing plate to the first substrate 1 or the second substrate 2, between the first substrate 1 and the polarizing plate 11 and / or the second substrate 2 and the polarizing plate 10. If a foreign object is interposed between them, as described in [Background Art] of this specification, the display quality is greatly impaired due to the foreign object. For this reason, when the sticking failure of the polarizing plate with respect to the 1st board | substrate 1 or the 2nd board | substrate 2 arises in order to suppress the fall of a display quality, the polarizing plate 11 from the 1st board | substrate 1 is suppressed. It is necessary to peel off the polarizing plate 10 from the second substrate 2 to remove the foreign matter, and to attach the polarizing plate to an appropriate position of the first substrate 1 or the second substrate 2 again.

  However, in the comparative example, each of the first substrate 1 and the second substrate 2 has an extremely thin thickness of 0.3 mm or less in response to a request for thinning the liquid crystal device 100. Mainly, each strength of the second substrate 2 is not so strong, and the peeling force of the adhesive layer provided on one surface of the polarizing plate is extremely large as described above and does not have a slight adhesiveness. As a factor, when the polarizing plate is peeled from the surface of the first substrate 1 or the second substrate 2 having a thin thickness in order to remove the foreign matter, the first substrate 1 or The crack of the second substrate 2 occurs, or a part of the adhesive layer adheres to the surface of the first substrate 1 or the second substrate 2, or the cell thickness (with the first substrate 1). The display substrate may have a color unevenness due to a change in the distance between the second substrates 2 (the same applies hereinafter). It may occur inconvenience significantly lowered. Here, when the thickness of each of the first substrate 1 and / or the second substrate 2 is thin, such a problem occurs when the peeling force of the adhesive layer becomes larger than 0.16 (N / cm). Experience has shown that it is easier.

  On the other hand, in this embodiment, the adhesive layer 17 provided on one surface of the polarizing plate has slight adhesiveness that can be peeled off with a peeling force of 0.001 to 0.16 (N / cm). . Here, when the peeling force of the adhesive layer 17 becomes smaller than 0.001 (N / cm), the adhesive layer 17 does not function as an original adhesive layer, and the first substrate 1 and / or When each thickness of the second substrate 2 is thin, the above-described problem may occur when the peeling force of the adhesive layer becomes larger than 0.16 (N / cm). Therefore, in this embodiment, each thickness of the 1st board | substrate 1 and the 2nd board | substrate 2 is as very thin as 0.3 mm or less, and each intensity | strength of the 1st board | substrate 1 or the 2nd board | substrate 2 is accompanied by this. Even if it is not so large, the first substrate 1 or the second substrate 2 is not cracked, and a part of the adhesive layer 17 is formed on the surface of the first substrate 1 or the second substrate 2. The polarizing plate can be easily peeled off from the surface of the first substrate 1 or the second substrate 2 without adhering and without changing the cell thickness. As a result, after the polarizing plate is peeled off, the polarizing plate can be attached again to an appropriate position on the first substrate 1 or the second substrate 2, and the first substrate 1 or the second substrate 2. The reworkability of the polarizing plate can be improved. Therefore, it is possible to prevent the display quality from deteriorating.

In addition, the pressure-sensitive adhesive layer 17 has a curing property that is cured by light or heat. In a preferred example, the pressure-sensitive adhesive layer 17 preferably has a curing property that is photocured by a light irradiation amount of 1000 mJ / cm ² or more, or heat-cured by a heating temperature of 80 ° C. or more and a heating time of 20 minutes or more. Thereby, the polarizing plate can be reliably fixed to an appropriate position of the first substrate 1 or the second substrate 2.

[Modification]
In the above embodiment, the pressure-sensitive adhesive layer 17 is provided in advance on one surface of the polarizing plate 10 or 11. However, the present invention is not limited thereto, and in the present invention, the pressure-sensitive adhesive layer 17 is one of the polarizing plates 10 or 11. It may be provided in advance on the outer surface of the first substrate 1 or the second substrate 2 instead of the surface.

  In the above embodiment, an example in which the polarizing plate 10 or 11 is applied as an example of the optical member has been described. However, in the present invention, the optical member is not limited to the polarizing plate.

[Application example]
In the above-described embodiment, the polarizing plate including the adhesive layer 17 on one surface is attached to the outer surface of the first substrate 1 or the second substrate 2. In addition to this, in the present invention, as shown in FIG. 3, the liquid crystal device 100 is further provided with another optical member 70 or 71 other than the polarizing plates 10 and 11, and the other optical member 70 is Affixed on the outer surface of the polarizing plate 10 via the adhesive layer 17 provided on one surface thereof, and / or the other optical member 71 via the adhesive layer 17 provided on the one surface thereof. You may make it affix on the outer surface of the polarizing plate 11. FIG.

  Here, examples of the other optical member include a retardation plate, a touch panel, or a cover film that protects the surface of the liquid crystal device 100.

  As a result, the first substrate 1 or the second substrate 2 is not cracked when the other optical member 70 or 71 is stuck to the polarizing plate. Without removing the polarizing plate from the surface of the substrate 1 or the second substrate, without attaching a part of the adhesive layer 17 to the surface of the polarizing plate, and without changing the cell thickness. The optical member 70 or 71 can be easily peeled off. As a result, after the other optical member 70 or 71 is peeled off, the other optical member 70 or 71 can be attached again to an appropriate position of the polarizing plate, and the other optical member 70 with respect to the polarizing plate can be attached. Or the rework property of 71 can be improved. Therefore, it is possible to prevent the display quality from deteriorating.

[Method of manufacturing liquid crystal device]
Next, a method for manufacturing the liquid crystal device 100 according to the embodiment of the present invention will be described with reference to FIGS. FIG. 4 shows a flowchart of a manufacturing method of the liquid crystal device 100 according to the embodiment of the present invention.

  The manufacturing method of the liquid crystal device 100 according to the embodiment of the present invention mainly includes a liquid crystal display panel manufacturing step S1 for manufacturing the liquid crystal display panel 50, and a polarizing plate attaching step for attaching the polarizing plates 10 and 11. S2, inspection step S3 for inspecting whether the polarizing plates 10 and 11 are attached, inspection step S3 for removing the polarizing plate 10 or 11 performed when the inspection in the inspection step S3 is defective, and as necessary The foreign matter removing step S7 performed, the curing step S4 of the adhesive layer 17 performed when the inspection in the inspection step S3 is satisfactory, and the step S5 of attaching other elements.

  First, in the liquid crystal display panel manufacturing step S1, the liquid crystal display panel 50 having the above-described configuration is manufactured. In the liquid crystal display panel manufacturing step S1, the first substrate 1 and the second substrate 2 are manufactured using a material containing glass as a main component, and each of the first substrate 1 and the second substrate 2 is set to 0.00. A substrate manufacturing process (not shown) for forming a thickness of 3 mm or less is provided. Thereby, each thickness of the 1st board | substrate 1 and the 2nd board | substrate 2 which were formed with the material which has glass as a main component is set to 0.3 mm or less. In the liquid crystal display panel manufacturing step S1, the liquid crystal display panel 50 shown in FIGS. 1 and 2 is manufactured by a known method using the first substrate 1, the second substrate 2, and the like.

Next, the polarizing plate is attached to the outer surfaces of the first substrate 1 and the second substrate 2 in the polarizing plate attaching step S2. Specifically, the polarizing plate attaching step S2 has slight adhesiveness that can be peeled off with a peeling force of 0.001 to 0.16 (N / cm) and a light irradiation amount of 1000 mJ / cm ² or more. Prepare polarizing plates (optical members) 10 and 11 each having an adhesive layer 17 having a curing property that is photocured or cured by a heating temperature of 80 ° C. or more and a heating time of 20 minutes or more. 2, the polarizing plate 10 is attached on the outer surface of the second substrate 2 through the adhesive layer 17, and the polarizing plate 11 is applied on the outer surface of the first substrate 1 through the adhesive layer 17. paste.

  Next, the inspection process S3 is performed to check whether the polarizing plates 10 and 11 are attached. Specifically, in this inspection step S3, whether or not a polarizing plate is attached to appropriate positions on the outer surfaces of the first substrate 1 and the second substrate 2, or whether the first substrate 1 and / or Alternatively, it is inspected whether foreign matter is not present between the second substrate 2 and the polarizing plate.

  Next, when the inspection result is poor in this inspection step S3, that is, when the pasting state is bad, a polarizing plate peeling step S6 and, if necessary, a foreign matter removing step S7 are performed. In addition, the example of the form of the defect of a sticking state is as above-mentioned, The description is abbreviate | omitted. In the polarizing plate peeling step S <b> 6, the polarizing plate is peeled from the first substrate 1 and / or the second substrate 10 with a peeling force of 0.001 to 0.16 (N / cm).

  Thereby, each thickness of the 1st board | substrate 1 and the 2nd board | substrate 2 is very thin with 0.3 mm or less, and each intensity | strength of the 1st board | substrate 1 or the 2nd board | substrate 2 is not so large in connection with this Even so, the first substrate 1 or the second substrate 2 is not cracked, and a part of the adhesive layer 17 is attached to the surface of the first substrate 1 or the second substrate 2. Furthermore, the polarizing plate can be easily peeled from the first substrate 1 or the second substrate 2 without changing the cell thickness. As a result, after peeling off the polarizing plate, if necessary, the foreign matter removing step S7 is performed, and the polarizing plate is attached to an appropriate position of the first substrate 1 or the second substrate 2 again. Step S2 can be performed, and the reworkability of the polarizing plate with respect to the first substrate 1 or the second substrate 2 can be improved. Therefore, it is possible to prevent the display quality from deteriorating.

  In the foreign matter removing step S7, the foreign matter is removed when a foreign matter is present between the first substrate 1 and / or the second substrate 2 and the polarizing plate as a defect in the attached state.

On the other hand, when the inspection result is good in the inspection step S3, that is, when the pasting state is good, the curing step S4 is performed. In this curing step S4, at a light irradiation amount of 1000 mJ / cm ² or more, for example, by irradiating the adhesive layer 17 with light through a polarizing plate, or using a thermostat, a heating temperature of 80 ° C. or higher and 20 The pressure-sensitive adhesive layer 17 is cured by heating the pressure-sensitive adhesive layer 17 for a heating time of at least minutes. Thereby, the polarizing plate can be reliably fixed to an appropriate position of the first substrate 1 or the second substrate 2.

  Next, by attaching other elements constituting the liquid crystal device 100 (step S5), the liquid crystal device 100 according to the present embodiment is manufactured. Here, examples of the other element attaching step S <b> 5 include a step of arranging the backlight 13 on the outer surface of the polarizing plate 11.

  Moreover, in the manufacturing method of this invention, the other optical member 70 which has the adhesion layer 17 on one surface is provided on the outer surface of the polarizing plate 10 through the said adhesion layer 17 between hardening process S4 and process S5. Pasting and / or other pasting process (not shown) for pasting another optical member 71 having the adhesive layer 17 on one surface onto the outer surface of the polarizing plate 11 via the adhesive layer 17 When the inspection process for performing pass / fail inspection of other optical members 70 and / or 71 (process for performing the same inspection as the inspection process S3; not shown) and the inspection in the inspection process are defective The other optical member 70 and / or 71 peeling step (step for carrying out a peeling operation similar to that in the peeling step S6; not shown) and a foreign matter removing step (polarizing plate and other opticals) performed as necessary. Foreign matter between the member 70 and / or 71 Of the other optical members 70 and / or 71 performed when the inspection in the inspection step is good, and the step of performing the same foreign matter removal operation as the foreign matter removal step S7 (not shown). A step of curing the adhesive layer 17 (a step of performing a curing operation similar to the curing step S4; not shown). Through these manufacturing processes, the liquid crystal device according to the application example shown in FIG. 3 is manufactured. Examples of other optical members include a retardation plate, a touch panel, or a cover film that protects the surface of the liquid crystal device 100.

  In the inspection step, when a failure in attaching the other optical member 70 or 71 to the polarizing plate occurs, the first substrate 1 or the second substrate 2 is cracked in the separation step. Without causing the polarizing plate to peel off from the surface of the first substrate 1 or the second substrate, without attaching a part of the adhesive layer 17 to the surface of the polarizing plate, The other optical members 70 and / or 71 can be easily peeled from the polarizing plate without changing the cell thickness. As a result, after the other optical members 70 and / or 71 are peeled off, the other optical member 70 or 71 can be pasted again at an appropriate position of the polarizing plate. The reworkability of the member 70 or 71 can be improved. Therefore, it is possible to prevent the display quality from deteriorating.

[Electronics]
Next, a specific example of an electronic device including the liquid crystal device 100 of the present invention will be described with reference to FIG.

  First, an example in which the liquid crystal device 100 of the present invention is applied to a display unit of a portable personal computer (so-called notebook personal computer) will be described. FIG. 5A is a perspective view showing the configuration of this personal computer. As shown in the figure, the personal computer 710 includes a main body 712 having a keyboard 711 and a display 713 to which the liquid crystal device 100 according to the present invention is applied.

  Next, an example in which the liquid crystal device 100 of the present invention is applied to a display unit of a mobile phone will be described. FIG. 5B is a perspective view showing the configuration of the mobile phone. As shown in the figure, a cellular phone 720 includes a plurality of operation buttons 721, a receiving port 722, a transmitting port 723, and a display unit 724 to which the liquid crystal device 100 according to the present invention is applied.

  Note that examples of the electronic apparatus to which the liquid crystal device 100 of the present invention can be applied include a liquid crystal television and a viewfinder type in addition to the personal computer shown in FIG. 5A and the mobile phone shown in FIG. Monitor direct-view video tape recorders, car navigation devices, pagers, electronic notebooks, calculators, word processors, workstations, videophones, POS terminals, digital still cameras, etc.

FIG. 3 is a plan view illustrating a planar configuration of the liquid crystal device according to the embodiment of the invention. FIG. 3 is a cross-sectional view illustrating a cross-sectional configuration of the liquid crystal device according to the embodiment. The top view which shows the planar structure of the liquid crystal device which concerns on the application example of this invention. 4 is a flowchart showing a method for manufacturing a liquid crystal device of the present invention. The example of an electronic device provided with the liquid crystal device which concerns on various embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 1st board | substrate, 2 2nd board | substrate, 10, 11 Polarizing plate (optical member), 17 Adhesive layer, 50 Liquid crystal display panel, 70, 71 Other optical members, 91 Element board | substrate, 92 Color filter board | substrate, 100 Liquid crystal device

Claims (9)

An electro-optical panel having a pair of substrates formed of a material containing glass as a main component and an electro-optical material sandwiched between the pair of substrates, and adheres to at least one of the pair of substrates An optical member pasted through a layer,
The electro-optical device is characterized in that the adhesive layer has fine adhesiveness that can be peeled off with a peeling force of 0.001 to 0.16 (N / cm), and has curing characteristics that are cured by light or heat. . The electro-optical device according to claim 1, wherein the adhesive layer is photo-cured by a light irradiation amount of 1000 mJ / cm ² or more.   The electro-optical device according to claim 1, wherein the adhesive layer is thermally cured by a heating temperature of 80 ° C. or more and a heating time of 20 minutes or more.   The electro-optical device according to claim 1, wherein a thickness of the substrate is 0.3 mm or less.   4. The optical member is attached with another optical member via another adhesive layer having the same properties as the adhesive layer. 5. The electro-optical device described.   An electronic apparatus comprising the electro-optical device according to claim 1 as a display unit. At least one of the pair of substrates in the electro-optical panel having a pair of substrates formed of a glass-based material and an electro-optical material sandwiched between the pair of substrates. , Having a slight adhesive property that can be peeled off with a peeling force of 0.001 to 0.16 (N / cm), photocuring with a light irradiation amount of 1000 mJ / cm ² or more, or a heating temperature of 80 ° C. or more and An attaching step of attaching an optical member provided on one surface with an adhesive layer having a curing property that is thermally cured by a heating time of 20 minutes or more, through the adhesive layer;
An inspection process for inspecting whether the optical member is attached to the substrate.
A peeling step of peeling the optical member from the substrate with a peeling force of 0.001 to 0.16 (N / cm) when the pasting state is poor in the inspection step;
When the pasting state is good in the inspection step, by irradiating light to the adhesive layer with a light irradiation amount of 1000 mJ / cm ² or more, or a heating temperature of 80 ° C. or more and 20 minutes or more And a pressure-sensitive adhesive layer curing step for curing the pressure-sensitive adhesive layer by heating the pressure-sensitive adhesive layer during the heating time.   8. The method of manufacturing an electro-optical device according to claim 7, further comprising a substrate manufacturing step of forming each of the pair of substrates to a thickness of 0.3 mm or less as a pre-step of the attaching step.   The foreign matter removing step of removing the foreign matter when the foreign matter is present between the one surface of the substrate and the adhesive layer as the next step of the peeling step. A method for manufacturing the electro-optical device according to 7 or 8.

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