JP2010113109A - Method for manufacturing electrooptical device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing an electrooptical device reducing displacement between the optical axis of an electrooptical panel and the optical axis of an optical film and suppressing increase in the number of man-hours for aligning and bonding. <P>SOLUTION: The method for manufacturing a liquid crystal device 100 as the electrooptical device includes: a selection process for optically detecting an angle of a transmission axis 45t to a reference side 45a of a polarizing plate 45 and selecting the polarizing plate 45 depending on the angle of the transmission axis 45t; and a bonding process for deciding a relative position of the polarizing plate 45 to a reference side 30a of a counter substrate 30 of a liquid crystal cell 50 depending on the angle of the transmission axis 45t using the polarizing plate 45 selected in the selection process, and bonding the polarizing plate 45 onto the surface of the counter substrate 30 of the liquid crystal cell 50. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for manufacturing an electro-optical device.

  A liquid crystal device as an electro-optical device includes a liquid crystal cell in which a liquid crystal layer is sandwiched between a pair of opposed substrates and a polarizing plate disposed on at least one surface of the liquid crystal cell. Since the liquid crystal device performs display using polarized light, the alignment direction of liquid crystal molecules in the liquid crystal layer and the optical axis of the polarizing plate are set to have a predetermined positional relationship. Accordingly, in the step of attaching the polarizing plate to the liquid crystal cell, if the predetermined arrangement position between the liquid crystal cell and the polarizing plate is shifted, the display quality is deteriorated due to a decrease in contrast of the liquid crystal device.

  Thus, a method has been proposed in which a reference polarizer having a known optical axis angle is used to align the alignment direction of the liquid crystal cell and the optical axis of the polarizing plate (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 8-201801

  However, in the method described in Patent Document 1, since the alignment direction of the liquid crystal cell and the optical axis of each polarizing plate are individually aligned and pasted with the optical axis of the reference polarizer as a reference, the number of alignment increases. As the number of man-hours increases, the sticking device has a more complicated configuration than the conventional sticking device based on the external shape of the liquid crystal cell and the polarizing plate.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 An electro-optical device manufacturing method according to this application example is an electro-optical device manufacturing method including an electro-optical panel and an optical film disposed on at least one surface of the electro-optical panel. The optical film is optically detected with respect to the outer shape of the optical film, and the optical film is selected according to the optical axis, and the optical film selected in the screening process is used. A sticking step of determining a relative position of the optical film with respect to an outer shape of the electro-optical panel according to an angle of the optical axis, and attaching the optical film to the at least one surface. Features.

  According to this configuration, since the optical film is sorted according to the angle of the optical axis optically detected in the sorting process, the optical film relative to the outer shape of the electro-optic panel is matched according to the angle of the optical axis in the pasting process. The position can be corrected. As a result, the positional deviation between the optical axis of the electro-optical panel and the optical axis of the optical film can be suppressed, so that a decrease in contrast of the electro-optical device can be suppressed. In addition, since it is not necessary to individually align the optical axis of the optical film with respect to the optical axis of the electro-optic panel in the pasting step, it is possible to reduce the man-hour for the step of pasting the optical film in the manufacturing process of the electro-optical device.

  Application Example 2 In the electro-optical device manufacturing method according to the application example described above, in the sorting step, the optical film to be sorted is disposed opposite to a reference optical element whose angle of the optical axis with respect to the outer shape is known. The angle of the optical axis with respect to the outer shape of the optical film may be detected by measuring the intensity of light transmitted through the reference optical element and the optical film.

  According to this configuration, the angle of the optical axis of the optical film to be selected is optically detected based on the angle of the optical axis of the reference optical element. For this reason, by making the angle of the optical axis of the reference optical element correspond to the angle of the optical axis in the optical design of the optical film, an optical film having an optical axis angle substantially the same as that in the optical design can be selected. Thereby, the position shift with the optical axis of an electro-optical panel and the optical axis of an optical film is suppressed more.

  [Application Example 3] A method for manufacturing an electro-optical device according to the application example, wherein, in the selecting step, the optical to be selected individually for a plurality of the reference optical elements having different angles of the optical axis with respect to an outer shape. The optical film to be selected may be selected according to the group corresponding to the angle of the optical axis with respect to the outer shape of the reference optical element by measuring the intensity of the light with the films arranged opposite to each other.

  According to this configuration, the optical film to be selected is selected based on the angles of different optical axes in the plurality of reference optical elements. Thereby, the optical film to be selected can be divided into groups according to the deviation with respect to the angle of the optical axis in the optical design.

  Application Example 4 In the electro-optical device manufacturing method according to the application example, in the sorting step, the plurality of reference optical elements are arrayed along a certain direction, and the optical film to be sorted is placed on the constant film The optical films to be sorted may be individually arranged to face the plurality of the reference optical elements by relatively moving in the direction.

  According to this configuration, by moving the optical film to be sorted with respect to a plurality of reference optical elements having different optical axis angles, the optical film is individually opposed to the plurality of reference optical elements, so that the optical axis of the optical film is Can be detected optically.

  Application Example 5 A method for manufacturing an electro-optical device according to the application example described above, wherein in the sorting step, the plurality of reference optical elements are relatively aligned with respect to the optical film to be sorted along a certain direction. By moving the optical film, the optical films to be selected may be individually arranged to face the plurality of reference optical elements.

  According to this configuration, by moving the plurality of reference optical elements having different optical axis angles with respect to the optical film to be selected, the optical film is individually opposed to the plurality of reference optical elements so that the optical axis of the optical film is Can be detected optically.

  Application Example 6 A method for manufacturing an electro-optical device according to the application example described above, wherein, in the attaching step, a difference between an angle of the optical axis with respect to an outer shape of the optical film and an angle of a predetermined optical axis in optical design The optical film may be attached using the optical film within a predetermined range on the basis of the outer shape of the electro-optical panel and the outer shape of the optical film.

  According to this configuration, since the difference between the angle of the optical axis with respect to the outer shape and the angle of the predetermined optical axis in the optical design is within a predetermined range, the optical shape is determined based on the outer shape of the electro-optical panel and the outer shape of the optical film. By attaching the film, the positional deviation between the optical axis of the electro-optical panel and the optical axis of the optical film can be suppressed.

  Application Example 7 A method for manufacturing an electro-optical device according to the application example described above, wherein, in the attaching step, a difference between an angle of the optical axis with respect to an outer shape of the optical film and an angle of a predetermined optical axis in optical design The outer shape of the electro-optical panel is used so that there is no difference between the angle of the optical axis with respect to the outer shape of the optical film and the angle of the predetermined optical axis in the optical design. The optical film may be attached by shifting the relative position of the outer shape of the optical film.

  According to this configuration, even if the difference between the angle of the optical axis with respect to the outer shape and the angle of the predetermined optical axis on the optical design is out of the predetermined range, the difference between the angle of the predetermined optical axis on the optical design is met. The difference is corrected by attaching the optical film by shifting the relative position of the outer shape of the optical film with respect to the outer shape of the electro-optical panel. Thereby, the position shift with the optical axis of an electro-optical panel and the optical axis of an optical film is suppressed.

  [Application Example 8] A method for manufacturing an electro-optical device according to the application example, wherein the attaching step includes a difference between an angle of the optical axis with respect to an outer shape of the optical film and an angle of a predetermined optical axis in optical design. At least 1 in the optical film such that there is no difference between the angle of the optical axis with respect to the outer shape of the optical film and the angle of the predetermined optical axis in the optical design. A cutting step of cutting a side, and after the cutting step, the optical film may be attached based on the outer shape of the electro-optical panel and the at least one side of the optical film cut.

  According to this configuration, even if the difference between the angle of the optical axis with respect to the outer shape and the angle of the predetermined optical axis on the optical design is out of the predetermined range, the difference between the angle of the predetermined optical axis on the optical design is met. The difference is corrected by cutting at least one side of the optical film. For this reason, by sticking the optical film on the basis of the corrected outer shape, the positional deviation between the optical axis of the electro-optical panel and the optical axis of the optical film can be suppressed.

  The present embodiment will be described below with reference to the drawings. In each drawing to be referred to, in order to show the configuration in an easy-to-understand manner, the layer thickness, dimensional ratio, angle, and the like of each component are appropriately changed and sometimes exaggerated.

<Liquid crystal device>
First, an example of a liquid crystal device as an electro-optical device manufactured using the method of manufacturing an electro-optical device according to the present embodiment will be described with reference to the drawings. FIG. 1 is a diagram illustrating a schematic configuration of an example of a liquid crystal device. Specifically, FIG. 1A is a plan view, and FIG. 1B is a cross-sectional view taken along line AA ′ in FIG. FIG. 2 is a diagram illustrating a pixel configuration of an example of a liquid crystal device. Specifically, FIG. 2A is a plan view showing the configuration of the pixel when viewed from the observation side (opposite substrate side), and FIG. 2B shows the alignment direction of the liquid crystal cell when viewed from the observation side. FIG. FIG. 3 is a cross-sectional view taken along line BB ′ in FIG. FIG. 4 is a diagram showing optical design conditions of an example of the liquid crystal device. Note that the counter substrate is not shown in FIG.

  A liquid crystal device 100 as an example of a liquid crystal device is, for example, an active matrix type liquid crystal device including a TFT (Thin Film Transistor) element as a switching element, and an FFS (Fringe-Field Switching) type transmission type liquid crystal device. It is a liquid crystal device.

  As shown in FIGS. 1A and 1B, the liquid crystal device 100 includes a liquid crystal cell 50 as an electro-optical panel. The liquid crystal cell 50 includes an element substrate 10, a counter substrate 30 disposed to face the element substrate 10, and a liquid crystal layer 40 sandwiched between the element substrate 10 and the counter substrate 30. The element substrate 10 and the counter substrate 30 are bonded to each other with a frame-shaped sealing agent 41 therebetween. The liquid crystal layer 40 is sealed in a space surrounded by the element substrate 10, the counter substrate 30, and the sealing agent 41.

  A polarizing plate 44 as an optical film is disposed on the surface of the element substrate 10 opposite to the liquid crystal layer 40. A polarizing plate 45 as an optical film is disposed on the surface of the counter substrate 30 opposite to the liquid crystal layer 40. Although not shown, an illumination device such as a backlight is disposed on the polarizing plate 44 side so as to face the polarizing plate 44.

  The element substrate 10 is larger than the counter substrate 30 and is bonded in a state where a part of the element substrate 10 protrudes from the counter substrate 30. A driver IC 42 for driving the liquid crystal layer 40 is mounted on the protruding portion. The liquid crystal device 100 performs display in the display area 2 in which the liquid crystal layer 40 is enclosed.

  As shown in FIG. 2A, the display area 2 is formed so that the scanning line 12 and the signal line 14 intersect, and the pixel 4 is provided corresponding to the intersection of the scanning line 12 and the signal line 14. It has been. The pixels 4 are arranged in a matrix so that there is a space between adjacent pixels 4. The pixel 4 contributes to display of any one of red (R), green (G), and blue (B), and one pixel group is configured from the three pixels 4 that contribute to each display of R, G, and B. ing. In the liquid crystal device 100, various colors can be displayed by appropriately changing the brightness of each of the three pixels 4 in each pixel group.

  The pixel 4 is provided with a pixel electrode 16, a common electrode 18 for generating a horizontal electric field between the pixel electrode 16, and a TFT element 20 for controlling the pixel electrode 16.

  The pixel electrode 16 is formed in a rectangular shape and has a plurality of slit-shaped openings 16a. The slit-shaped openings 16a are formed in parallel to each other in a direction along the extending direction of the signal line 14, for example. The pixel electrode 16 is electrically connected to the drain electrode 20d of the TFT element 20 through a contact hole 24a that penetrates the insulating layer 24 (see FIG. 3). The pixel electrode 16 is made of a light-transmitting conductive material, for example, ITO (Indium Tin Oxide).

  The common electrode 18 is formed in a rectangular shape and is provided so as to overlap the pixel electrode 16 in a planar manner. The common electrode 18 overlaps the common wiring 17 on one side, and is electrically connected to the common wiring 17 at this portion. The common electrode 18 is made of a light-transmitting conductive material, for example, ITO.

  The TFT element 20 includes a gate electrode 20g, a semiconductor layer 20a, a source electrode 20s, and a drain electrode 20d. The gate electrode 20g is a part of the scanning line 12. The semiconductor layer 20a is formed at a position overlapping the gate electrode 20g in a planar manner. The source electrode 20s is a portion branched from the signal line 14, and a part thereof is formed so as to cover a part (source side) of the semiconductor layer 20a. The drain electrode 20d is formed so as to partially cover the semiconductor layer 20a (drain side).

  As shown in FIG. 3, the element substrate 10 is configured by using the substrate 11 as a base, and the TFT element 20, the common wiring 17, the common electrode 18, the gate insulating layer 22, and the insulating layer are formed on the substrate 11. 24, the pixel electrode 16, and the alignment film 28. The substrate 11 is made of a light-transmitting material, for example, glass, quartz, resin, or the like.

  On the liquid crystal layer 40 side of the substrate 11, a gate electrode 20g, a common wiring 17 and a common electrode 18 are formed. The gate insulating layer 22 is formed so as to cover the substrate 11, the gate electrode 20 g, the common wiring 17, and the common electrode 18. On the gate insulating layer 22, a semiconductor layer 20a, a source electrode 20s, and a drain electrode 20d are formed.

  The insulating layer 24 is formed so as to cover the gate insulating layer 22, the semiconductor layer 20a, the source electrode 20s, and the drain electrode 20d. The pixel electrode 16 is formed on the insulating layer 24. The pixel electrode 16 and the common electrode 18 are opposed to each other via the gate insulating layer 22 and the insulating layer 24, and the gate insulating layer 22 and the insulating layer 24 sandwiched between the pixel electrode 16 and the common electrode 18 are provided. A storage capacitor serving as a dielectric film is formed.

  In the element substrate 10, when a voltage is applied between the pixel electrode 16 and the common electrode 18, a lateral electric field is generated in the slit-shaped opening 16 a and its periphery. The orientation of the liquid crystal molecules in the liquid crystal layer 40 is controlled by this lateral electric field. The arrangement of the pixel electrode 16 and the common electrode 18 is not limited to this form. The common electrode 18 may be disposed closer to the liquid crystal layer 40 than the pixel electrode 16. In the case of such a configuration, the common electrode 18 has a slit-shaped opening.

  An alignment film 28 is formed on the element substrate 10 on the side in contact with the liquid crystal layer 40. The alignment film 28 is made of, for example, a polyimide resin. On the surface of the alignment film 28, for example, an alignment such as a rubbing process is performed with a direction that forms an angle of 5 degrees clockwise with respect to the extending direction of the signal line 14 as an alignment direction (see FIG. 2B). Processing has been applied.

  Next, the counter substrate 30 is located on the observation side of the liquid crystal device 100. The counter substrate 30 includes a substrate 31 as a base, and includes a light shielding layer 32, a color filter layer 34, an overcoat layer 35, and an alignment film 36 on the substrate 31.

  The substrate 31 is made of a light-transmitting material, and is made of glass, quartz, resin, or the like, for example. The light shielding layer 32 and the color filter layer 34 are formed on the substrate 31. The light shielding layer 32 is disposed in a region between adjacent pixels 4 on the substrate 31. The color filter layer 34 is disposed corresponding to the region of the pixel 4. The color filter layer 34 is made of, for example, an acrylic resin and contains color materials corresponding to R, G, and B colors. The overcoat layer 35 is formed so as to cover the light shielding layer 32 and the color filter layer 34.

  An alignment film 36 is formed on the side of the counter substrate 30 that contacts the liquid crystal layer 40. The alignment film 36 is made of, for example, a polyimide resin. On the surface of the alignment film 36, for example, a direction that forms an angle of 5 degrees in the clockwise direction with respect to the extending direction of the signal line 14 when viewed from the observation side is defined as an alignment direction (see FIG. 2B). An orientation process such as a rubbing process is performed in a direction different from the rubbing direction of the alignment film 28 by 180 degrees.

  The liquid crystal layer 40 is disposed between the element substrate 10 and the counter substrate 30. The liquid crystal molecules of the liquid crystal layer 40 are regulated by the alignment treatment applied to the alignment film 28 and the alignment film 36 in a state where no electric field is generated between the pixel electrode 16 and the common electrode 18 (off state). Orient along the direction. Further, the liquid crystal molecules of the liquid crystal layer 40 generate an electric field generated in a direction orthogonal to the extending direction of the opening 16a in a state where the electric field is generated between the pixel electrode 16 and the common electrode 18 (on state). Orient along. Thus, in the liquid crystal layer 40, the alignment state is controlled by twisting the liquid crystal molecules between the off state and the on state.

  Next, the optical design conditions of the liquid crystal device 100 will be described with reference to FIG. The polarizing plates 44 and 45 have a transmission axis and an absorption axis as optical axes. FIG. 4A shows a transmission axis 44 t of the polarizing plate 44 and a transmission axis 45 t of the polarizing plate 45. The transmission shaft 44t and the transmission shaft 45t are disposed so as to be orthogonal to each other.

  As shown in FIG. 4B, the slit-like opening 16 a of the pixel electrode 16 extends along the extending direction of the signal line 14. The direction of the electric field generated between the pixel electrode 16 and the common electrode 18 in the on state is a direction orthogonal to the extending direction of the signal line 14, that is, a direction along the extending direction of the scanning line 12.

  For example, the alignment film 28 on the element substrate 10 side is subjected to a rubbing process in a direction that forms an angle of 5 degrees in the clockwise direction with respect to the extending direction of the signal line 14. The alignment film 36 on the counter substrate 30 side is in a direction that forms an angle of 5 degrees clockwise with respect to the extending direction of the signal line 14, and in a direction that is 180 degrees different from the rubbing direction of the alignment film 28. The rubbing process is given. Therefore, the rubbing direction of the alignment films 28 and 36, that is, the alignment direction in the off state of the liquid crystal layer 40 is a direction that forms an angle of 5 degrees clockwise with respect to the extending direction of the opening 16a.

  The transmission axis 44t of the polarizing plate 44 is parallel to the rubbing direction of the alignment films 28 and 36, and the transmission axis 45t of the polarizing plate 45 is orthogonal to the rubbing direction of the alignment films 28 and 36. When the transmission axes 44t and 45t and the rubbing direction of the alignment films 28 and 36 are disposed at such predetermined positions, the liquid crystal device 100 is darkly displayed by blocking light incident from the illumination device in the off state. . Therefore, the liquid crystal device 100 is in a normally black mode. The transmission axis 44t may be orthogonal to the rubbing direction of the alignment films 28 and 36, and the transmission axis 45t may be parallel to the rubbing direction of the alignment films 28 and 36.

  By the way, if the relative positional relationship between the transmission axes 44t and 45t of the polarizing plates 44 and 45 with respect to the rubbing direction of the alignment films 28 and 36 is shifted, a small amount of incident light is transmitted in the off state. This leads to a decrease in display contrast. For example, when the angles of the transmission axes 44t and 45t of the polarizing plates 44 and 45 are shifted from a predetermined angle in the optical design, the angles of the transmission axes 44t and 45t and the predetermined transmission axes 44t and 45t in the optical design are set. The greater the difference from the 45t angle (hereinafter referred to as the shift angle), the greater the reduction in contrast and the lower the display quality of the liquid crystal device 100.

  FIG. 5 is a diagram illustrating an example of the relationship between the deviation angle of the transmission axis of the polarizing plate and the contrast in the liquid crystal device. In FIG. 5, the vertical axis and the horizontal axis are the deviation angle of the transmission axis 44 t of the polarizing plate 44 and the deviation angle of the transmission axis 45 t of the polarizing plate 45, respectively. In addition, a shift in the clockwise direction when viewed from the observation side with respect to a predetermined position in the optical design is defined as a positive shift, and a shift in the counterclockwise direction is defined as a negative shift.

  In FIG. 5, hatched areas 51, 52, 53, 54, and 55 indicate areas in which the contrast ratio is the same. The contrast ratio is a ratio between the minimum value and the maximum value of the light transmittance in a VT curve (a curve indicating the dependency of the transmittance on the applied voltage). In the regions 51, 52, 53, 54, and 55, the contrast ratio becomes 1: 1400 or more (up to about 1: 1500) in order, 1: 1300 or more, 1: 1200 or more, 1: 1100 or more, and less than 1: 1100. Yes. A range 56 indicated by a one-dot chain line indicates a range in which the deviation angle of the transmission axis 44t of the polarizing plate 44 and the deviation angle of the transmission axis 45t of the polarizing plate 45 are ± 0.25 °. Note that the contrast ratio of the liquid crystal device 100 is desirably 1: 1300 or more.

  As shown in FIG. 5, when the deviation angle of one of the transmission axes 44t and 45t of the polarizing plates 44 and 45 is 1.0 ° or −1.0 °, the contrast ratio is lower than 1: 1100. . Further, even when the deviation angle between both the transmission axes 44t and 45t is within ± 0.5 °, the contrast ratio may be lower than 1: 1200. On the other hand, if the deviation angle of both the transmission axes 44t and 45t is within the range 56 indicated by the one-dot chain line, that is, within 0 ° ± 0.25 °, the contrast ratio is at least 1: 1300 or more. Accordingly, if the deviation angle of the transmission axes 44t and 45t with respect to a predetermined position in the optical design is suppressed within a range of about 0 ° ± 0.25 °, a contrast ratio of 1: 1300 or more can be obtained. The range of about 0 ° ± 0.25 ° is set as a predetermined range of the deviation angle.

  As described above, in the manufacturing process of the liquid crystal device 100, the transmission axes 44 t and 45 t of the polarizing plates 44 and 45 with respect to the rubbing direction of the alignment films 28 and 36 can be suppressed and accurately adjusted to a predetermined position in the optical design. This is important in ensuring the display quality of the liquid crystal device 100.

  In the liquid crystal device 100, the optical design conditions such as the extending direction of the opening 16a of the pixel electrode 16 and the rubbing direction of the alignment films 28 and 36 are not limited to the above-described embodiments. In addition, the liquid crystal device 100 may be in a normally white mode in which light incident from the illumination device is transmitted in an off state and a bright display is obtained. When the liquid crystal device 100 is in the normally white mode, the transmission axis 44t of the polarizing plate 44 and the transmission axis 45t of the polarizing plate 45 are arranged in parallel to each other.

<Method for manufacturing liquid crystal device>
(First embodiment)
Next, a manufacturing method of a liquid crystal device as a manufacturing method of the electro-optical device according to the first embodiment will be described with reference to the drawings. FIG. 6 is a flowchart illustrating the method for manufacturing the liquid crystal device according to the first embodiment. Hereinafter, the case where the liquid crystal device 100 is manufactured will be described as an example.

  In FIG. 6, process P <b> 11 and process P <b> 12 are processes for manufacturing the element substrate 10, and process P <b> 21 and process P <b> 22 are processes for manufacturing the counter substrate 30. Process P11 and process P12 and process P21 and process P22 are performed independently, respectively. Process P31 and process P32 are processes in which the liquid crystal cell 50 is prepared by combining the element substrate 10 and the counter substrate 30. Step P33 is a step of attaching the polarizing plates 44 and 45 to the liquid crystal cell 50. In addition, although the process P11, the process P12, the process P21, the process P22, the process P31, and the process P32 are not described in detail, a known technique can be applied in these processes.

  First, the process for manufacturing the element substrate 10 and the process for manufacturing the counter substrate 30 will be described. In step P11, the TFT element 20, the common wiring 17, the common electrode 18, the gate insulating layer 22, the insulating layer 24, the pixel electrode 16, and the like are formed on the substrate 11. Subsequently, in step P12, the alignment film 28 is formed on the surface of the element substrate 10 on which these elements, electrodes, and the like are formed, and the surface of the alignment film 28 is rubbed in the direction shown in FIG.

  Next, in process P21, a light shielding layer 32, a color filter layer 34, an overcoat layer 35, and the like are formed on the substrate 31. Subsequently, in step P22, an alignment film 36 is formed on the surface of the counter substrate 30, and a rubbing process is performed on the surface of the alignment film 36 in the direction shown in FIG.

  Next, in process P31, the element substrate 10 and the counter substrate 30 are bonded together. The bonding is performed by applying the sealing agent 41 to the element substrate 10 or the counter substrate 30 and performing alignment (positioning), and then bringing the element substrate 10 and the counter substrate 30 into contact with each other and pressing them. Subsequently, in step P32, liquid crystal is injected between the element substrate 10 and the counter substrate 30 from the opening (injection port) of the sealant 41, and the injection port is sealed. Thus, the liquid crystal cell 50 is prepared.

  Step P33 is a step of attaching the polarizing plates 44 and 45 to the liquid crystal cell 50. The polarizing plates 44 and 45 are prepared by cutting a large polarizing plate into a predetermined size in advance. At the time of the cutting, the cutting is performed so that the angle of the transmission shafts 44t and 45t with respect to the outer shape becomes a predetermined design angle. Here, for example, in the case of the polarizing plate 45, the outer shape refers to the reference side 45a (see FIG. 1B). The reference side 45 a is a side facing the reference side 30 a (see FIG. 1B) of the counter substrate 30 among the four sides of the polarizing plate 45.

  If the angle of the transmission axis 45t with respect to the reference side 45a is the same as the predetermined angle in the optical design, the transmission axis 45t is obtained by attaching the polarizing plate 45 to the liquid crystal cell 50 with the reference side 30a and the reference side 45a as a reference. Is arranged so as to be orthogonal to the rubbing direction of the alignment films 28 and 36. However, the angle of the transmission axis 45t with respect to the reference side 45a may deviate from a predetermined angle in optical design due to variations or the like.

  Therefore, the process P33 optically detects the angle of the transmission axis 45t with respect to the reference side 45a of the polarizing plate 45, and selects the polarizing plate 45 according to the angle of the transmission axis 45t and the selection process. A sticking step of using the polarizing plate 45 to determine the relative position of the polarizing plate 45 with respect to the outer shape of the liquid crystal cell 50 according to the angle of the transmission axis 45t, and attaching the polarizing plate 45 to the surface of the liquid crystal cell 50; I have.

  Next, with reference to FIG. 7, FIG. 8, and FIG. 9, the polarizing plate selection step and the pasting step according to the first embodiment will be described. 7, 8 and 9 are diagrams for explaining a method of attaching a polarizing plate according to the first embodiment. Specifically, FIG. 7 is a diagram for explaining a polarizing plate selection method. FIG. 8 is a diagram illustrating the reference polarizer. FIG. 9A is a diagram illustrating the transmission axis of the polarizing plate, and FIG. 9B is a diagram illustrating the positional relationship when the polarizing plate is attached. Here, the selection process and the sticking process of the polarizing plate 45 will be described. Since the polarizing plate 44 is the same as the polarizing plate 45, description thereof is omitted.

  First, the selection process of the polarizing plate 45 will be described. As shown in FIG. 7, reference polarizers 61, 62, 63, 64, 65 as reference optical elements are prepared. The reference polarizers 61, 62, 63, 64, 65 are, for example, polarizing plates with known optical axis angles with respect to the outer shape, and have a higher degree of polarization than ordinary polarizing plates. Here, the outer shape refers to reference sides 61a, 62a, 63a, 64a, 65a, which are one side of each of the reference polarizers 61, 62, 63, 64, 65. The reference polarizers 61, 62, 63, 64, 65 may be wire grid polarizers or transparent substrates having Brewster angles.

  The reference polarizers 61, 62, 63, 64, and 65 have transmission axes 61t, 62t, 63t, 64t, and 65t (see FIG. 8B) as optical axes. The angles of the transmission axes 61t, 62t, 63t, 64t, and 65t with respect to the reference sides 61a, 62a, 63a, 64a, and 65a of the reference polarizers 61, 62, 63, 64, and 65 are different from each other.

  As shown in FIG. 8A, the angle of the transmission axis 63t with respect to the reference side 63a of the reference polarizer 63 coincides with a predetermined angle in the optical design of the transmission axis 44t of the polarizing plate 44. Therefore, when the polarizing plate 45 to be selected is arranged so that the reference side 45 a is parallel to the reference side 63 a of the reference polarizer 63, the transmission axis 45 t of the polarizing plate 45 is orthogonal to the transmission axis 63 t of the reference polarizer 63. In this case, the transmission axis 45t of the polarizing plate 45 coincides with a predetermined angle in optical design.

  As shown in FIG. 8B, the angle of the transmission axis 64t with respect to the reference side 64a of the reference polarizer 64 is clockwise, that is, on the plus side with respect to the angle of the transmission axis 63t with respect to the reference side 63a of the reference polarizer 63. For example, the angle of the transmission axis 65t with respect to the reference side 65a of the reference polarizer 65 is shifted by, for example, 1.0 ° to the plus side. Further, the angle of the transmission axis 62t with respect to the reference side 62a of the reference polarizer 62 is deviated counterclockwise, that is, minus side, for example, by 0.5 ° with respect to the angle of the transmission axis 63t with respect to the reference side 63a. The angle of the transmission shaft 61t with respect to the reference side 61a of the child 61 is shifted by, for example, 1.0 ° to the minus side.

  Therefore, when the polarizing plate 45 to be selected is arranged so that the reference side 45a is parallel to the reference side 64a of the reference polarizer 64 and the transmission axis 45t is orthogonal to the transmission axis 64t, the transmission axis 45t of the polarizing plate 45 is obtained. Is shifted by 0.5 ° to the plus side with respect to a predetermined angle in the optical design. Similarly, when the transmission axis 45t is orthogonal to the transmission axis 65t, the transmission axis 45t is 1.0 ° on the plus side of the predetermined optical design, and when the transmission axis 45t is orthogonal to the transmission axis 62t, the transmission axis 45t is optical. When the design angle is 0.5 ° on the minus side and the transmission axis 45t is orthogonal to the transmission axis 61t, the transmission axis 45t is offset by 1.0 ° on the optical design angle minus side. Become. In the present embodiment, the transmission axes 61t, 62t, 63t, 64t, and 65t are set to have different angles at intervals of 0.5 °, but the present invention is not limited to this configuration.

  Returning to FIG. 7, the reference polarizers 61, 62, 63, 64 and 65 are arranged in a fixed direction so that the surfaces are parallel to each other and the reference sides 61 a, 62 a, 63 a, 64 a and 65 a are parallel to each other. Are arranged in a line along The reference polarizers 61, 62, 63, 64, and 65 are made of, for example, a translucent member and are held by a holding portion (not shown) that can be fixed by suction. In FIG. 7, the reference polarizers 61, 62, 63, 64, and 65 are arranged in this order from the left side in the drawing, but the order is not limited to this form.

  Next, the polarizing plate 45 to be selected is disposed so as to face the reference polarizers 61, 62, 63, 64, 65. The polarizing plate 45 is arranged so that the surface thereof is parallel to the surfaces of the reference polarizers 61, 62, 63, 64, and 65, and the reference side 45a is parallel to the reference sides 61a, 62a, 63a, 64a, and 65a. Is done. The polarizing plate 45 is made of, for example, a translucent member and is held by a holding portion (not shown) that can be fixed by suction. The polarizing plate 45 can be moved from the left side to the right side as indicated by an arrow C in the drawing relative to the reference polarizers 61, 62, 63, 64, 65 by the holding unit.

  For each of the reference polarizers 61, 62, 63, 64, 65, a light source 46 is disposed on the opposite side of the polarizing plate 45, and the reference polarizers 61, 62, 63, 64, 65 and the polarized light are placed between the light source 46. The light receiving unit 48 is disposed so as to face the light source 46 with the plate 45 interposed therebetween. Then, the polarizing plate 45 to be selected is sequentially moved from the left side in the drawing along the direction in which the reference polarizers 61, 62, 63, 64, 65 are arranged, and the reference polarizers 61, 62, 63, 64 are moved. , 65 are arranged to face each other individually.

  As the light source 46, for example, a lamp that emits light having a wavelength in the visible light region may be used, or a light emitting diode (LED) or a laser diode may be used. Further, as the light receiving unit 48, an optical sensor may be used, or the intensity of the light 47 may be converted into an electrical signal and measured using a photomultimeter or the like. Alternatively, the luminance of the light 47 may be measured using a luminance meter or the like as the light receiving unit 48. It is desirable that the light source 46 be disposed relative to the reference polarizer so that light emitted from the light source 46 enters from the normal direction of the surface of the reference polarizer. Further, the positional relationship between the light source 46 and the light receiving unit 48 may be upside down in the drawing.

  Of the reference polarizers 61, 62, 63, 64, 65, for example, the light from the light source 46 is transmitted to the reference polarizer 61 and the polarizer 45 in a state where the polarizing plate 45 to be selected is opposed to the reference polarizer 61. Enter sequentially. The light 47 transmitted through the reference polarizer 61 and the polarizing plate 45 is received by the light receiving unit 48 and the intensity of the light 47 is measured. At this time, when the angle of the transmission axis 45t with respect to the reference side 45a of the polarizing plate 45 is orthogonal to the angle of the transmission axis 61t with respect to the reference side 61a of the reference polarizer 61, the intensity of the light 47 is minimized.

  For each of the reference polarizers 61, 62, 63, 64, and 65, if the intensity of the light 47 transmitted through the reference polarizer and the polarizing plate 45 is measured with the polarizing plate 45 facing each other as described above, The transmission axis 45t of the polarizing plate 45 is substantially orthogonal to the transmission axis of the reference polarizer of the combination that minimizes the intensity of the light 47, and the deviation angle of the transmission axis 45t of the polarizing plate 45 is substantially the same. become. Therefore, by measuring the intensity of the light 47 with reference to the reference polarizers 61, 62, 63, 64, 65, the angle of the transmission axis 45t with respect to the reference side 45a of the polarizing plate 45 is detected, and the deviation angle of the transmission axis 45t. The polarizing plate 45 can be selected according to the above.

  Here, the angles of the transmission axes 61t, 62t, 63t, 64t, and 65t of the reference polarizers 61, 62, 63, 64, and 65 are set at intervals of 0.5 °. Therefore, a width of about ± 0.25 ° is provided for the deviation angle of the transmission axis 45t of the polarizing plate 45 corresponding to each of the transmission axes 61t, 62t, 63t, 64t, and 65t, and the upper limit of the intensity of the light 47 within this range. A value is set, and the polarizing plate 45 whose measurement result of the intensity of the light 47 is less than or equal to this upper limit value is selected. The light receiving unit 48 may detect the light 47 when the intensity of the light 47 is less than or equal to the upper limit value.

  First, the polarizing plate 45 is made to face the reference polarizer 61 and the intensity of the light 47 is measured. When the measurement result of the intensity of the light 47 is equal to or less than a predetermined upper limit value, the polarizing plate 45 to be selected is placed on the reference polarizer 61. It is divided into groups (hereinafter referred to as “−1.0 ° group”) having the same deviation of −1.0 ° as the transmission axis 61t. The deviation angle of the transmission axis 45t of the polarizing plate 45 divided into “−1.0 ° group” is in the range of about −1.0 ° ± 0.25 °.

  Next, the polarizing plate 45 in which the intensity of the light 47 exceeds the predetermined value and is not classified into the “−1.0 ° group” as described above moves in the right direction indicated by an arrow in the drawing and moves to the reference polarizer 62. Are arranged opposite to each other. Then, the light 47 transmitted through the reference polarizer 62 and the polarizing plate 45 is received by the light receiving unit 48 and the intensity of the light 47 is measured. When the measurement result of the intensity of the light 47 is equal to or less than a predetermined upper limit value, the group “−0.5 ° having the same deviation of −0.5 ° as the transmission axis 62 t of the reference polarizer 62 is placed on the polarizing plate 45 to be selected. Grouped into “groups”. The deviation angle of the transmission axis 45t of the polarizing plate 45 divided into “−0.5 ° group” is in the range of about −0.5 ° ± 0.25 °.

  Next, the polarizing plate 45 in which the intensity of the light 47 exceeds the predetermined value and is not classified into the “−0.5 ° group” as described above moves in the right direction indicated by the arrow in the drawing, and the reference polarizer 63. Are arranged opposite to each other. Similarly, based on the measurement result of the intensity of the light 47, the “0 ° group” polarizing plates 45 in which the deviation angle of the transmission axis 45t is in the range of about 0 ° ± 0.25 ° are selected. Thereafter, similarly, the “0.5 ° group” in which the deviation angle is in the range of about 0.5 ° ± 0.25 °, and the deviation angle is in the range of about 1.0 ° ± 0.25 °. The “1.0 ° group” polarizing plate 45 is selected.

  In this way, the polarizing plates 45 to be selected are “−1.0 ° group”, “−0.5 ° group”, “0 ° group”, “0.5 ° group”, and “1.0”. It is divided into ° groups. Among these, the deviation angle is within a predetermined range (about 0 ° ± 0.25 °) in the “0 ° group”, and other deviation angles are outside the predetermined range. As described above, the polarizing plates 45 to be sorted are sorted.

  Next, with reference to FIG. 9 (a), (b), the sticking process of the polarizing plate 45 is demonstrated. In FIGS. 9A and 9B, the polarizing plate 45 is indicated by hatching. In FIG. 9A, θ is the difference between the angle of the transmission axis 45t relative to the reference side 45a of the polarizing plate 45 and the angle of the predetermined transmission axis 45t in the optical design, that is, the deviation angle. In the pasting step, the polarizing plate 45 sorted by group in the sorting step is used, and the relative position of the polarizing plate 45 with respect to the outer shape of the counter substrate 30 (liquid crystal cell 50) is determined according to the deviation angle θ of the transmission axis 45t. Then, the polarizing plate 45 is attached to the surface of the counter substrate 30.

  More specifically, the polarizing plate 45 is shown in FIG. 9B in the plane facing the counter substrate 30 so that the deviation angle θ shown in FIG. In this way, it is rotated by the shift angle θ. That is, the relative position of the reference side 45a of the polarizing plate 45 with respect to the reference side 30a of the counter substrate 30 is shifted in the rotation direction by the shift angle θ, and the polarizing plate 45 is attached. The direction in which the polarizing plate 45 is rotated is the minus side (counterclockwise direction) indicated by the arrow D in FIG. 9B when the deviation angle θ is the plus side (clockwise direction), and the deviation angle θ is the minus side. Is the plus side opposite to the arrow D.

  First, a sticking method in the case of using the “0 ° group” polarizing plate 45 in which the deviation angle θ is in a predetermined range, that is, in the range of about 0 ° ± 0.25 ° will be described. For the “0 ° group” polarizing plate 45, the reference angle 30a of the counter substrate 30 and the reference side 45a of the polarizing plate 45 are not rotated in FIG. The polarizing plate 45 is attached to the counter substrate 30 so that the reference side 30a and the reference side 45a are parallel to each other.

  In the “0 ° group” polarizing plate 45, the deviation angle θ of the transmission axis 45t with respect to the reference side 45a is in the range of about 0 ° ± 0.25 ° with respect to a predetermined angle in the optical design of the transmission axis 45t. . Therefore, by attaching the polarizing plate 45 with reference to the reference side 30a of the counter substrate 30 and the reference side 45a of the polarizing plate 45, the deviation of the transmission axis 45t of the polarizing plate 45 with respect to the rubbing direction of the alignment film 36 is 0 ° ±. It is suppressed to a range of about 0.25 °.

  Subsequently, when the deviation angle θ is outside the predetermined range, that is, “0.5 ° group”, “1.0 ° group”, “−0.5 ° group”, and “−1.0 ° group”. The sticking method when using the polarizing plate 45 will be described.

  In the case where the “0.5 ° group” polarizing plate 45 is used, the offset angle θ is set to 0.5 °, and the polarizing plate 45 is in the plane facing the counter substrate 30, and is minus as shown by an arrow D in FIG. Rotate to the side by 0.5 ° corresponding to the shift angle θ. Then, the polarizing plate 45 is attached to the surface of the counter substrate 30 in a state where the relative position of the reference side 45a with respect to the reference side 30a is shifted by 0.5 ° to the minus side.

  As a result, the transmission axis 45t shifted by 0.5 ° ± 0.25 ° to the plus side with respect to the reference side 45a is corrected by 0.5 ° to the minus side. The deviation of the transmission axis 45t of the polarizing plate 45 is suppressed to a range of about 0 ° ± 0.25 °. In addition, when the polarizing plate 45 protrudes from the opposing substrate 30, the part may be cut | disconnected suitably.

  When the polarizing plate 45 of “1.0 ° group” is used, the polarizing plate 45 is attached by rotating the polarizing plate 45 to the minus side by 1.0 °, with the shift angle θ being 1.0 °. As a result, the transmission axis 45t shifted in the range of 1.0 ° ± 0.25 ° to the plus side with respect to the reference side 45a is corrected by 1.0 ° to the minus side.

  In the case of using the “−0.5 ° group” polarizing plate 45, the shift angle θ is set to −0.5 °, and the polarizing plate 45 is moved to the positive side in the direction opposite to the arrow D in FIG. Rotate 5 ° and paste. As a result, the transmission axis 45t shifted to the minus side in the range of 0.5 ° ± 0.25 ° is corrected by 0.5 ° to the plus side.

  In the case of using the “−1.0 ° group” polarizing plate 45, the polarizing angle is set to −1.0 °, and the polarizing plate 45 is rotated by 1.0 ° to the plus side and attached. As a result, the transmission axis 45t shifted to the minus side in the range of 1.0 ° ± 0.25 ° is corrected by 1.0 ° to the plus side.

  As described above, even when the shift angle θ is outside the predetermined range, the relative position of the reference side 45a of the polarizing plate 45 with respect to the reference side 30a of the counter substrate 30 is shifted according to the shift angle θ to shift the polarizing plate 45. By sticking, the deviation of the transmission axis 45t of the polarizing plate 45 with respect to the rubbing direction of the alignment film 36 can be suppressed to a range of about 0 ° ± 0.25 °.

  Next, as for the polarizing plate 44, the selection process and the pasting process are performed in the same manner as the polarizing plate 45. However, in the selection process of the polarizing plate 44, the angle of the transmission axis 63t with respect to the reference side 63a of the reference polarizer 63 is matched with a predetermined angle in the optical design of the transmission axis 45t of the polarizing plate 45. The deviation angle of the transmission axes 61t, 62t, 64t, 65t of the reference polarizers 61, 62, 64, 65 with respect to the transmission axis 63t of the reference polarizer 63 is set in the same manner as the polarizing plate 45 selection process.

  Thereby, also in the sticking process of the polarizing plate 44, the shift | offset | difference of the transmission axis 44t of the polarizing plate 44 with respect to the rubbing direction of the alignment film 28 is suppressed to the range of about 0 degree +/- 0.25 degree. Therefore, since the deviation of the transmission axes 44t and 45t of the polarizing plates 44 and 45 can be suppressed within a range of about 0 ° ± 0.25 °, the contrast ratio of the liquid crystal device 100 is 1: 1300 or more. Thus, the liquid crystal device 100 is completed.

  According to the first embodiment, the following effects can be obtained.

  (1) Since the polarizing plates 44 and 45 having a deviation angle θ with respect to a predetermined angle in the optical design of the transmission axes 44t and 45t are selected and used, the outer shape of the liquid crystal cell 50 and the polarizing plates 44 and 45 are used. By sticking the polarizing plates 44 and 45 to the liquid crystal cell 50 based on the outer shape, the displacement of the transmission axes 44t and 45t with respect to the rubbing direction of the alignment films 28 and 36 can be suppressed within a predetermined range. Thereby, since the contrast fall of the liquid crystal device 100 is suppressed, the liquid crystal device 100 which has the outstanding display quality can be provided.

  (2) Even if the deviation angle θ between the transmission axes 44t and 45t is outside the predetermined range, the polarizing plates 44 and 45 are divided into a plurality of groups according to the deviation angle θ between the transmission axes 44t and 45t, and the deviation angle θ The polarizing plate 44, 45 is attached with the relative position of the outer shape of the polarizing plates 44, 45 shifted from the outer shape of the liquid crystal cell 50 so that the transmission axis 44t with respect to the rubbing direction of the alignment films 28, 36 is eliminated. , 45t can be kept within a predetermined range.

  (3) Polarizing plates 44 and 45 to be selected are individually arranged opposite to reference polarizers 61, 62, 63, 64, and 65 having different transmission axes 61t, 62t, 63t, 64t, and 65t, and transmitted light 47 Is divided into a plurality of groups according to the deviation angle θ, so that the polarizing plates 44 and 45 can be easily selected.

  (4) When attaching the polarizing plates 44 and 45, it is not necessary to individually align the rubbing direction of the alignment films 28 and 36 of the liquid crystal cell 50 and the transmission axes 44t and 45t. Man-hours in the process can be reduced. Moreover, since it can affix on the basis of an external shape, it can affix even if it does not use the sticking apparatus of a complicated structure.

  In the present embodiment, the case where the liquid crystal device 100 is in the normally black mode is taken as an example. However, the method for manufacturing the liquid crystal device according to the present embodiment is also applied to the case where the liquid crystal device 100 is in the normally white mode. be able to.

  In this embodiment, the polarizing plate 45 is first selected and pasted, and then the polarizing plate 44 is selected and pasted. The polarizing plate 44 is first selected and pasted. Alternatively, the step of selecting the polarizing plate 44 and the polarizing plate 45 may be performed first, and then the step of attaching the polarizing plate 44 and the polarizing plate 45 may be performed.

(Second Embodiment)
Next, a manufacturing method of the liquid crystal device according to the second embodiment will be described with reference to the drawings. 10 and 11 are diagrams for explaining a method of manufacturing the liquid crystal device according to the second embodiment.

  The manufacturing method of the liquid crystal device according to the second embodiment is different from the manufacturing method of the liquid crystal device according to the first embodiment in that the reference polarizers 61, 62, 63 in the selection process of the polarizing plates 44, 45 in the process P33. 64, 65 and the polarizing plates 44, 45 to be selected are different in arrangement method, but the other steps are the same. Constituent elements common to the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 10, the reference polarizers 61, 62, 63, 64, 65 are arranged in a line along a certain direction, and the polarizing plate 45 to be selected is placed on the reference polarizers 61, 62, 63, 64, 65. It arrange | positions so that it may oppose with respect to either. A light receiving portion 48 is disposed on the opposite side of the polarizing plate 45 from the reference polarizers 61, 62, 63, 64, 65, and between the light receiving portion 48 and the polarizing plate 45 and the reference polarizers 61, 62, 63, 64, The light source 46 is arranged so as to face the light receiving unit 48 with either one of 65 interposed therebetween.

  The reference polarizers 61, 62, 63, 64, 65 are moved relative to the polarizing plate 45 to be selected along the direction in which the reference polarizers 61, 62, 63, 64, 65 are arranged. For example, it is sequentially moved from the left side to the right side in the figure indicated by the arrow C. In this way, light that is incident from the light source 46 and transmitted through the reference polarizer and the polarizing plate 45 in a state where the polarizing plate 45 is individually arranged to face the reference polarizers 61, 62, 63, 64, 65. 47 is received by the light receiving unit 48, and the polarizing plate 45 is selected based on the measurement result of the intensity of the light 47.

  Note that the polarizing plate 45 to be selected is different from the direction in which the reference polarizers 61, 62, 63, 64, 65 are arranged, for example, the direction in which the reference polarizers 61, 62, 63, 64, 65 are arranged. May be sequentially moved at the time of selection in a direction orthogonal to the.

  According to the second embodiment, the polarizing plates 44 and 45 can be selected similarly to the first embodiment by disposing at least a pair of the light source 46 and the light receiving unit 48.

  The arrangement method of the reference polarizers 61, 62, 63, 64, 65 is not limited to the above-described form. As shown in FIG. 11, the reference polarizers 61, 62, 63, 64, and 65 are arranged along the circumference, sequentially moved so as to rotate along the circumference, and individually applied to the polarizing plate 45. You may arrange it facing.

  Although not shown, by rotating the center of the reference polarizer 63 around the rotation axis with the reference polarizer 63 facing the polarizing plate 45 to be selected, the transmission axis 63t is set to 0. 0, for example. It may be changed at intervals of 5 °. In this way, the single reference polarizer 63 can serve as the reference polarizers 61, 62, 63, 64, 65.

(Third embodiment)
Next, a manufacturing method of the liquid crystal device according to the third embodiment will be described with reference to the drawings. 12 and 13 are diagrams for explaining a method of manufacturing the liquid crystal device according to the third embodiment. Specifically, FIGS. 12 (a) and 13 (a) are diagrams showing a method of cutting a polarizing plate, and FIGS. 12 (b) and 13 (b) explain the positional relationship when the polarizing plate is attached. FIG. In FIGS. 12A and 12B and FIGS. 13A and 13B, the polarizing plate is indicated by hatching.

  The manufacturing method of the liquid crystal device according to the third embodiment is different from the manufacturing method of the liquid crystal device according to the first embodiment in that the attaching step of the polarizing plates 44 and 45 in step P33 is one side of the polarizing plates 44 and 45. The difference is that it includes a cutting step for cutting the sides, but the other steps are the same. Constituent elements common to the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The selection process of the polarizing plates 44 and 45 in the process P33 in this embodiment is the same as that in the first embodiment. In the attaching step of the polarizing plates 44 and 45 in the process P33, the attaching method when using the “0 ° group” polarizing plates 44 and 45 whose deviation angle θ is within a predetermined range is the same as that in the first embodiment. However, when the polarizing plates 44 and 45 having the deviation angle θ outside the predetermined range are used, the cutting step is performed first.

  The sticking process including the cutting process of the polarizing plate 45 will be described with reference to FIGS. 12 (a) and 12 (b) and FIGS. 13 (a) and 13 (b). Since the polarizing plate 44 is the same as the polarizing plate 45, description thereof is omitted.

  In the cutting process in the present embodiment, the difference between the angle of the transmission axis 45t with respect to the reference side 45a of the polarizing plate 45 and the angle of the predetermined transmission axis 45t on the optical design, that is, the deviation angle θ is eliminated. Cut at least one side.

  First, in the case of the “0.5 ° group” polarizing plate 45, the transmission axis 45t is 0.5 ° ± 0.00 mm on the plus side (clockwise direction) with respect to the optical design angle with respect to the reference side 45a. It is shifted by about 25 °. Looking at the reference side 45a with the transmission axis 45t as a reference, the reference side 45a is relatively 0.5 ° ± on the minus side relative to the position where the transmission axis 45t coincides with the optical design angle. It is shifted by about 0.25 °.

  Therefore, the deviation angle θ is set to 0.5 °, and as shown in FIG. 12A, the reference side 45a is rotated to the plus side with the one end 45d of the reference side 45a as the rotation axis. The polarizing plate 45 is cut along a line 45c at a position shifted by 0.5 °. As a result, a portion 45b of the polarizing plate 45 that is closer to the reference side 45a than the line 45c is removed. In the polarizing plate 45 from which the portion 45b has been removed, when the side along the line 45c (hereinafter referred to as the reference side 45c) is used as a reference, the angle of the transmission axis 45t is corrected to the minus side by 0.5 ° by the shift angle θ. It will be done. The position where the polarizing plate 45 is cut may be a position that intersects the reference side 45a as long as it is parallel to the line 45c. Moreover, when the polarizing plate 45 protrudes from the opposing substrate 30, the part may be cut | disconnected suitably.

  After the cutting step, as shown in FIG. 12B, the reference side 30a and the reference side 45c are parallel to each other with reference to the reference side 30a of the counter substrate 30 and the reference side 45c of the polarizing plate 45. Then, the polarizing plate 45 is attached to the counter substrate 30. At this time, since the angle of the transmission axis 45t is in a range of about 0 ° ± 0.25 ° with respect to the reference side 45c, the deviation of the transmission axis 45t of the polarizing plate 45 with respect to the rubbing direction of the alignment film 36 is 0 ° ±. It is suppressed to a range of about 0.25 °.

  In the case of the “1.0 ° group” polarizing plate 45, the deviation angle θ is set to 1.0 °, and as shown in FIG. 12A, the reference side 45a is set with the end 45d of the reference side 45a as the rotation axis. The polarizing plate 45 is cut along a line 45c at a position shifted by 1.0 ° corresponding to the shift angle θ so as to rotate toward the plus side. The method of attaching the polarizing plate 45 is the same as that of the “0.5 ° group” polarizing plate 45. Accordingly, the deviation of the transmission axis 45t of the polarizing plate 45 with respect to the rubbing direction of the alignment film 36 is suppressed to a range of about 0 ° ± 0.25 °.

  Next, in the case of the “−0.5 ° group” and “−1.0 ° group” polarizing plates 45, as shown in FIG. 13A, the transmission axis 45t is on the negative side (counterclockwise direction). Therefore, the polarizing plate 45 is cut at a position shifted by the shift angle θ so as to rotate the reference side 45a to the minus side with the end 45e opposite to the end 45d of the reference side 45a as the rotation axis. .

  As shown in FIG. 13B, the polarizing plate 45 is attached in the same manner as the polarizing plate 45 in the “0.5 ° group”, the reference side 30 a of the counter substrate 30 and the reference side of the polarizing plate 45. With reference to 45c, the polarizing plate 45 is attached to the counter substrate 30 so that the reference side 30a and the reference side 45c are parallel to each other. Thereby, the deviation of the transmission axis 45t of the polarizing plate 45 with respect to the rubbing direction of the alignment film 36 is suppressed to a range of about 0 ° ± 0.25 °.

  Also in the sticking step of the polarizing plate 44, the sticking step including the cutting step is performed in the same manner as the polarizing plate 45, so that the deviation of the transmission axis 44t of the polarizing plate 44 with respect to the rubbing direction of the alignment film 28 is 0 ° ± 0.25 °. It is suppressed to the extent of the degree. Therefore, since the deviation of the transmission axes 44t and 45t of the polarizing plates 44 and 45 can be suppressed within a range of about 0 ° ± 0.25 °, the contrast ratio of the liquid crystal device 100 is 1: 1300 or more.

  According to the third embodiment, even when the deviation angle θ between the transmission axes 44t and 45t is outside the predetermined range, the polarizing plates 44 and 45 are divided into a plurality of groups according to the deviation angle θ between the transmission axes 44t and 45t. By cutting one side of the polarizing plates 44 and 45 and attaching the polarizing plates 44 and 45 so that the shift angle θ is eliminated, the transmission axes 44t and 44t with respect to the rubbing direction of the alignment films 28 and 36 are obtained. The shift of 45 t can be suppressed within a predetermined range.

  As mentioned above, although embodiment of this invention was described, various deformation | transformation can be added with respect to the said embodiment in the range which does not deviate from the meaning of this invention. As modifications, for example, the following can be considered.

(Modification 1)
In the above embodiment, the liquid crystal device 100 has the configuration including the polarizing plates 44 and 45 as the optical film, but the configuration of the optical film is not limited to this configuration. Optical film compensates for liquid crystal cells and polarizing plates in addition to polarizing plates, thereby expanding the viewing angle in liquid crystal device displays, compensating for coloring of the background color, etc. A film may be provided. Even with such an optical film, the optical film can be selected and pasted by applying the manufacturing method of the liquid crystal device of the above embodiment.

(Modification 2)
In the above-described embodiment, the polarizing plate has a configuration that does not include a release film or the like in the polarizing plate selection step, but is not limited to this configuration. The polarizing plate may have a release film that protects the adhesive layer to be attached to the liquid crystal cell, and a protective film that prevents damage and contamination of the surface of the polarizing plate. Even when the polarizing plate has a release film or a protective film, the polarizing plate can be selected by applying the manufacturing method of the liquid crystal device of the above embodiment.

  In addition, these release films and protective films themselves may be optically anisotropic. In such a case, a part that is optically isotropic, such as an opening or a notch, may be selectively provided in the release film or the protective film. According to such a structure, in the selection process of the polarizing plates 44 and 45, the light from the light source 46 is incident on the optically isotropic portion of the release film or the protective film, so that the release film or the protection film is protected. Since the optical influence of the film is eliminated, the polarizing plates can be selected without reducing the measurement accuracy of the intensity of the light 47 transmitted through the reference polarizer and the polarizing plate.

(Modification 3)
In the above embodiment, the liquid crystal device 100 is an FFS transmissive liquid crystal device, but is not limited to this mode. The liquid crystal device 100 may be an IPS (In-Plane Switching) type liquid crystal device that controls the alignment of liquid crystal molecules by a lateral electric field in a direction parallel to the element substrate, as in the FFS method. The liquid crystal device 100 controls the alignment of liquid crystal molecules by a vertical electric field generated between the element substrate and the counter substrate, such as a TN (Twisted Nematic) method, a VA (Vertical Alignment) method, an ECB (Electrically Controlled Birefringence) method, and the like. The liquid crystal device may be used. Further, the liquid crystal device 100 may be a transflective liquid crystal device having a transmissive display region and a reflective display region, or a total reflection liquid crystal device in which a polarizing plate is disposed on one surface. Even in these liquid crystal devices, the manufacturing method of the liquid crystal device of the above embodiment can be applied.

(Modification 4)
In the above embodiment, the electro-optical device is the liquid crystal device 100, but is not limited to this form. The electro-optical device may be an organic electroluminescence device (organic EL device), a plasma display, an electrophoresis device, or the like. If these electro-optical devices are configured to include an optical film, the method for manufacturing the liquid crystal device of the above embodiment can be applied as a method for manufacturing the electro-optical device.

1 is a diagram illustrating a schematic configuration of an example of a liquid crystal device. 3A and 3B each illustrate a structure of a pixel of an example of a liquid crystal device. FIG. 3 is a cross-sectional view taken along line B-B ′ in FIG. The figure which shows the optical design conditions of an example of a liquid crystal device. FIG. 10 is a diagram illustrating an example of a relationship between a transmission axis shift angle of a polarizing plate and a contrast in a liquid crystal device. 6 is a flowchart for explaining a manufacturing method of the liquid crystal device according to the first embodiment. The figure explaining the selection method of a polarizing plate. The figure explaining a reference | standard polarizer. The figure explaining the sticking method of the polarizing plate which concerns on 1st Embodiment. 8A and 8B illustrate a method for manufacturing a liquid crystal device according to a second embodiment. 8A and 8B illustrate a method for manufacturing a liquid crystal device according to a second embodiment. FIG. 6 is a view for explaining a method for manufacturing a liquid crystal device according to a third embodiment. FIG. 6 is a view for explaining a method for manufacturing a liquid crystal device according to a third embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Display area, 4 ... Pixel, 10 ... Element substrate, 11 ... Substrate, 12 ... Scan line, 14 ... Signal line, 16 ... Pixel electrode, 16a ... Opening, 17 ... Common wiring, 18 ... Common electrode, 20 ... TFT element, 20a ... semiconductor layer, 20d ... drain electrode, 20g ... gate electrode, 20s ... source electrode, 22 ... gate insulating layer, 24 ... insulating layer, 24a ... contact hole, 28, 36 ... alignment film, 30 ... counter substrate 30a ... reference side, 31 ... substrate, 32 ... light-shielding layer, 34 ... color filter layer, 35 ... overcoat layer, 40 ... liquid crystal layer, 41 ... sealing agent, 42 ... driver IC, 44, 45 ... polarizing plate, 44t 45t ... transmission axis, 45a ... reference side, 45b ... part, 45c ... reference side, 45d, 45e ... end, 46 ... light source, 47 ... light, 48 ... light receiving part, 50 ... liquid crystal cell, 61, 62, 63 , 64, 5 ... reference polarizer, 61a, 62a, 63a, 64a, 65a ... reference edge, 61t, 62t, 63t, 64t, 65t ... transmission axis 100 ... liquid crystal device.

Claims (8)

An electro-optical device comprising: an electro-optical panel; and an optical film disposed on at least one surface of the electro-optical panel,
Optically detecting the angle of the optical axis with respect to the outer shape of the optical film, and selecting the optical film according to the angle of the optical axis; and
Using the optical film selected in the selection step, the relative position of the optical film with respect to the outer shape of the electro-optical panel is determined according to the angle of the optical axis, and the optical film is formed on the at least one surface. A pasting process for pasting,
A method for manufacturing an electro-optical device. A method of manufacturing the electro-optical device according to claim 1,
In the sorting step, the optical film to be sorted is disposed opposite to a reference optical element having a known optical axis angle with respect to the outer shape, and the intensity of light transmitted through the reference optical element and the optical film is measured. The method of manufacturing an electro-optical device, comprising detecting an angle of the optical axis with respect to an outer shape of the optical film. A method of manufacturing the electro-optical device according to claim 2,
In the sorting step, the optical film to be sorted is individually arranged to face the plurality of reference optical elements having different optical axis angles with respect to the outer shape, and the light intensity is measured, and the outer shape of the reference optical element is measured. A method for manufacturing an electro-optical device, wherein the optical films to be selected are sorted by group corresponding to the angle of the optical axis with respect to. A method for manufacturing the electro-optical device according to claim 3,
In the sorting step, the plurality of reference optical elements are arranged along a certain direction, and the optical film to be sorted is relatively moved along the certain direction, whereby the plurality of reference optical elements are arranged on the plurality of reference optical elements. On the other hand, a method for manufacturing an electro-optical device, wherein the optical films to be selected are individually arranged to face each other. A method for manufacturing the electro-optical device according to claim 3,
In the sorting step, the plurality of reference optical elements are moved relative to the optical film to be sorted along a certain direction, thereby individually sorting the plurality of reference optical elements. A method of manufacturing an electro-optical device, wherein the optical films are arranged opposite to each other. A method for manufacturing an electro-optical device according to any one of claims 1 to 5,
In the attaching step, the optical film having a difference between an angle of the optical axis with respect to the outer shape of the optical film and an angle of a predetermined optical axis on an optical design within a predetermined range, the outer shape of the electro-optical panel and the A method for manufacturing an electro-optical device, comprising sticking the optical film on the basis of the outer shape of the optical film. A method for manufacturing an electro-optical device according to any one of claims 1 to 5,
In the affixing step, the optical film with respect to the outer shape of the optical film is used by using the optical film in which the difference between the angle of the optical axis with respect to the outer shape of the optical film and the angle of the predetermined optical axis in optical design is outside a predetermined range. The optical film is pasted by shifting the relative position of the outer shape of the optical film with respect to the outer shape of the electro-optical panel so that there is no difference between the angle of the shaft and the angle of the predetermined optical axis in the optical design. A method for manufacturing an electro-optical device. A method for manufacturing an electro-optical device according to any one of claims 1 to 5,
The affixing step uses the optical film in which a difference between an angle of the optical axis with respect to the outer shape of the optical film and a predetermined optical axis in optical design is outside a predetermined range, and the optical with respect to the outer shape of the optical film. A cutting step of cutting at least one side of the optical film so that there is no difference between the angle of the axis and the angle of the predetermined optical axis on the optical design;
The method of manufacturing an electro-optical device, wherein the optical film is attached after the cutting step with reference to the outer shape of the electro-optical panel and the at least one side of the optical film cut.

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