JP4962411B2 - Method for manufacturing stereoscopic image display device - Google Patents

Description

  The present invention relates to a method for manufacturing a stereoscopic image display device. In particular, the present invention relates to a method for manufacturing a stereoscopic image display device in which a phase difference plate that polarizes the image light to form a right-eye image and a left-eye image is bonded to an image light exit surface of the image display device.

A three-dimensional image display device is known in which a phase difference plate that polarizes the image light to form a right-eye image and a left-eye image is bonded to an emission surface of the liquid crystal display from which the image light is emitted (for example, a patent Reference 1). The exit surface of the liquid crystal display and the retardation plate are bonded together by interposing an adhesive between them and pressing them by a laminating method using a roll, a diaphragm or the like.
Japanese Patent Laid-Open No. 10-253824

  Here, when air is interposed between the exit surface of the liquid crystal display and the phase difference plate, internal reflection of light occurs between them, and crosstalk between the image light for the right eye and the image light for the left eye Will occur. For this reason, it is required to adhere the emission surface of the liquid crystal display and the retardation plate in close contact so that air does not enter between them.

  In order to solve the above problems, a method of manufacturing a stereoscopic image display device according to the present invention includes an image forming apparatus that has a plurality of pixels arranged in two dimensions and forms image light having one polarization direction, and The image light emitted from the image forming apparatus is bonded to the exit surface from which the image light is emitted in the image forming apparatus, and the image light for the right eye and the image light for the left eye having polarization directions orthogonal to each other, or the polarization axis. Is a stereoscopic image display device comprising a phase difference plate that separates right eye image light and left eye image light whose directions of rotation are opposite to each other, wherein the phase difference plate extends from the center side to the edge side. In a state of being bent so that the distance from the emission surface is widened, the bonding is performed on the emission surface in order from the side closer to the emission surface.

  In the method for manufacturing a stereoscopic image display device described above, a spacer jig that protrudes toward the retardation plate side from an adhesive surface between the retardation plate and the emission surface between an edge of the retardation plate and the emission surface The phase difference plate may be adhered to the emission surface in the order farther from the side closer to the emission surface.

  Further, in the above method for manufacturing a stereoscopic image display device, the retardation plate is attached to and held on a sticking surface of a holding portion disposed to face the emission surface, and the sticking surface is moved from the center side to the edge side. It is good also as the above-mentioned. In the state where it curved so that the space with the above-mentioned outgoing surface may spread over, it may be characterized by press-contacting to the above-mentioned outgoing side in order from the side near to the outgoing side.

  In the method for manufacturing a stereoscopic image display device, the retardation plate may be bonded to the emission surface in a vacuum environment.

  It should be noted that the above summary of the invention does not enumerate all the necessary features of the present invention. In addition, a sub-combination of these feature groups can also be an invention.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

  FIG. 1 is an exploded perspective view showing a stereoscopic image display device 100 manufactured by the manufacturing method of the present embodiment. As shown in this figure, the stereoscopic image display apparatus 100 includes an image forming apparatus 120, a phase difference plate 180, and an antireflection layer 200. The image forming apparatus 120 has a plurality of pixels arranged two-dimensionally and forms image light having one polarization direction. The phase difference plate 180 is bonded to an emission surface from which image light is emitted from the image forming apparatus 120, and the image light emitted from the image forming apparatus 120 is converted into right-eye image light and left-eye image having polarization directions orthogonal to each other. Separated into light.

  The image forming apparatus 120 includes a light source 130 and an image display unit 140. The image display unit 140 includes a light source side polarizing plate 150, an image generation unit 160, an emission side polarizing plate 170, and an antireflection layer 200. It is not essential to provide the antireflection layer 200.

  The light source 130 is arranged on the innermost side of the stereoscopic image display device 100, and in a state where the stereoscopic image display device 100 is used (hereinafter, abbreviated as “usage state of the stereoscopic image display device 100”), the light source 130 is white. The polarized light is emitted toward one surface of the light source side polarizing plate 150. In the present embodiment, a surface light source is used as the light source 130. However, for example, a combination of a point light source and a condenser lens may be used instead of the surface light source. An example of this condensing lens is a Fresnel lens sheet.

  The light source side polarizing plate 150 is disposed on the light source 130 side in the image generation unit 160. Since the light source side polarizing plate 150 has a transmission axis and an absorption axis orthogonal to the transmission axis, when non-polarized light emitted from the light source 130 enters, light having a polarization axis parallel to the transmission axis direction of the non-polarized light is transmitted. In addition, light having a polarization axis parallel to the absorption axis direction is blocked. Here, the direction of the polarization axis refers to the vibration direction of the electric field in the light. The direction of the transmission axis in the light source side polarizing plate 150 is a direction inclined 45 degrees counterclockwise with respect to the horizontal direction as indicated by an arrow in the figure.

  The image generation unit 160 includes a right-eye image generation area 162 and a left-eye image generation area 164. The right-eye image generation area 162 and the left-eye image generation area 164 are areas obtained by dividing the image generation section 160 in the horizontal direction, as shown in the figure, and a plurality of right-eye image generation areas 162 and left-eye image generation areas 164 are provided. Are arranged alternately in the vertical direction.

  In the usage state of the stereoscopic image display device 100, a right-eye image and a left-eye image are generated in the right-eye image generation region 162 and the left-eye image generation region 164 of the image generation unit 160, respectively. At this time, when the light transmitted through the light source side polarizing plate 150 enters the right eye image generation region 162 of the image generation unit 160, the transmitted light of the right eye image generation region 162 is the image light of the right eye image (hereinafter, “right eye image”). Abbreviated as “image light”). Similarly, when the light transmitted through the light source side polarizing plate 150 is incident on the left eye image generation region 164 of the image generation unit 160, the transmitted light of the left eye image generation region 164 is the image light of the left eye image (hereinafter referred to as “left eye image”). Abbreviated as “image light”).

  Note that the right-eye image light transmitted through the right-eye image generation region 162 and the left-eye image light transmitted through the left-eye image generation region 164 are each linearly polarized light having a polarization axis in a specific direction. Here, the polarization axes in specific directions may be the same as each other. In the illustrated example, the polarization axes are both set to the same direction as the transmission axis in the output-side polarizing plate 170 described later. Yes. In such an image generation unit 160, for example, an LCD (Liquid Crystal Display) in which a plurality of small cells are arranged two-dimensionally in the horizontal direction and the vertical direction and liquid crystal is sealed between alignment films in each cell is used. By electrically driving each cell in this LCD, each cell transmits a light passing therethrough without changing the direction of its polarization axis, and a state in which the direction of the polarization axis is rotated by 90 degrees and transmitted. Switch.

  The exit side polarizing plate 170 is disposed on the light exit side in the image generation unit 160. When the right-eye image light that has been transmitted through the right-eye image generation region 162 and the left-eye image light that has been transmitted through the left-eye image generation region 164 are incident on the output-side polarizing plate 170, the polarization axis is transmitted. Light that is parallel to the axis is transmitted and the light that is parallel to the absorption axis is blocked by the polarization axis. Here, the direction of the transmission axis in the output side polarizing plate 170 is a direction inclined 45 degrees clockwise relative to the horizontal direction as indicated by an arrow in the figure. That is, the image display unit 140 emits the right-eye image light and the left-eye image light as linear light whose polarization axes are parallel to each other. Note that the term “parallel” as long as the observer has such a degree of parallelism that the image displayed by the stereoscopic image display apparatus 100 can be recognized as a stereoscopic image, and includes an error range.

  The phase difference plate 180 includes a right-eye polarizing region 181 and a left-eye polarizing region 182. The positions and sizes of the right-eye polarization region 181 and the left-eye polarization region 182 on the phase difference plate 180 are the positions of the right-eye image generation region 162 and the left-eye image generation region 164 of the image generation unit 160, as shown in FIG. It corresponds to the size. Therefore, in the usage state of the stereoscopic image display apparatus 100, the right-eye image light transmitted through the right-eye image generation region 162 is incident on the right-eye polarization region 181 and the left-eye polarization region 182 is incident on the left-eye image region. Left-eye image light that has passed through the image generation region 164 enters.

  Further, a light shielding unit 190 is provided at the boundary between the right-eye polarizing region 181 and the left-eye polarizing region 182 on the surface of the retardation film 180 that faces the image display unit 140. The light shielding portion 190 is an image that enters the right-eye polarization region 181 across the boundary among the left-eye image light that should be incident on the left-eye polarization region 182 adjacent to the right-eye polarization region 181 of the phase difference plate 180. Absorbs and blocks light. Similarly, the light-shielding unit 190 includes the left-eye polarization region that exceeds the boundary of the right-eye image light to be incident on the right-eye polarization region 181 adjacent to the left-eye polarization region 182 of the phase difference plate 180. The image light incident on 182 is absorbed and blocked. Thus, by providing the light shielding portion 190 at the boundary of the phase difference plate 180, crosstalk is less likely to occur in the right-eye image light and the left-eye image light emitted from the stereoscopic image display device 100.

  The right-eye polarization region 181 transmits the incident right-eye image light as it is without rotating the polarization axis thereof. The left-eye polarization region 182 rotates the polarization axis of the incident left-eye image light in a direction orthogonal to the polarization axis of the right-eye image light incident on the right-eye polarization region 181. Therefore, the polarization axis of the right-eye image light that has passed through the right-eye polarization region 181 and the polarization axis of the left-eye image light that has passed through the left-eye polarization region 182 are mutually oriented, as indicated by the arrows in the figure. Orthogonal. The term “orthogonal” as used herein is sufficient if the observer intersects with a right angle such that the image displayed by the stereoscopic image display apparatus 100 can be recognized as a stereoscopic image, and includes an error range.

  In addition, the arrow in the phase difference plate 180 in the drawing indicates the polarization axis of the polarized light that has passed through the phase difference plate 180. The right-eye polarizing region 181 is made of, for example, transparent glass or resin, and the left-eye polarizing region 182 is, for example, an optical axis having an angle of 45 degrees with respect to the direction of the polarization axis of the incident left-eye image light. A half-wave plate is used. In the example shown in the drawing, the direction of the optical axis of the left-eye polarizing region 182 is a horizontal direction or a vertical direction. Here, the optical axis refers to either the fast axis or the slow axis when light passes through the left-eye polarizing region 182. In place of the retardation plate 180, half-wave plates are used for the right-eye polarizing region 181 and the left-eye polarizing region 182, respectively, and the polarization axes of the incident right-eye image light and left-eye image light are orthogonal to each other. The light may be emitted as linearly polarized light.

  FIG. 2 is a schematic diagram showing the usage state of the stereoscopic image display apparatus 100. When observing a stereoscopic image with the stereoscopic image display device 100, the observer 500 observes the right eye image light and the left eye image light projected from the stereoscopic image display device 100 through the polarizing glasses 220. The polarizing glasses 220 are provided with a right-eye image transmission unit 232 at a position corresponding to the right eye 512 side of the observer 500 when the observer 500 puts on the polarizing glasses 220, and a left-eye image transmission at a position corresponding to the left eye 514 side. A part 234 is arranged. The right-eye image transmission unit 232 and the left-eye image transmission unit 234 are polarization lenses having specific transmission axis directions different from each other, and are fixed to the frame of the polarizing glasses 220.

  The right-eye image transmission unit 232 is a polarizing plate having the same transmission axis direction as that of the right-eye image light transmitted through the right-eye polarization region 181 and the absorption axis direction orthogonal to the transmission axis direction. Yes. The left-eye image transmission unit 234 is a polarizing plate having the same transmission axis direction as the left-eye image light transmitted through the left-eye polarization region 182 and the absorption axis direction orthogonal to the transmission axis direction. Yes. For the right-eye image transmission part 232 and the left-eye image transmission part 234, for example, a polarizing lens to which a polarizing film obtained by uniaxially stretching a film impregnated with a dichroic dye is attached is used.

  When an observer 500 observes a stereoscopic image displayed by the stereoscopic image display device 100, the right-eye image light and the left-eye image light transmitted through the right-eye polarization region 181 and the left-eye polarization region 182 of the retardation plate 180 are displayed. As described above, the stereoscopic image display apparatus 100 is observed with the polarizing glasses 220 within the range where the light is emitted. Accordingly, the observer 500 can observe only the right eye image light with the right eye 512 and only the left eye image light with the left eye 514, and recognizes the image displayed by the stereoscopic image display apparatus 100 as a stereoscopic image. it can.

  FIG. 3 shows a schematic cross-sectional view of the stereoscopic image display device 100 housed in the housing 110. As shown in this figure, the image display unit 140 is supported by the outer frame 165. Further, the phase difference plate 180 and the antireflection layer 200 are attached to the emission side of the image display unit 140. The housing 110 accommodates the light source 130 and the image display unit 140.

  The phase difference plate 180 is bonded to a surface on the output side of the image display unit 140 (hereinafter referred to as an output surface 141) by an adhesive layer 300. The phase difference plate 180 has a structure in which a right-eye polarizing region 181 and a left-eye polarizing region 182 are formed on a transparent and flexible base material 183 such as glass, and applies a load in the thickness direction. Or by its own weight.

  The thickness of the adhesive layer 300 is preferably the same as that of the light shielding portion 190. Here, the same thickness includes the case where the adhesive layer 300 is about 1.5 times thicker than the light shielding portion 190 in addition to the case where the thickness is completely the same. For example, when the thickness of the light shielding part 190 is 10 μm to 15 μm, the thickness of the adhesive layer 300 is preferably 10 μm to 20 μm, and when the thickness of the light shielding part 190 is 2 μm to 3 μm, The thickness of is preferably 2 μm to 5 μm. Here, the thickness of the adhesive layer 300 refers to the thickness of the exit-side polarizing plate 170 from the incident-side surface in the right-eye polarizing region 181 and the left-eye polarizing region 182 of the retardation film 180. When the thickness of the light shielding portion 190 is smaller, bubbles are less likely to enter between the adhesive layer 300 and the retardation plate 180.

  A method for manufacturing the stereoscopic image display apparatus 100 will be described below. The manufacturing method of the stereoscopic image display apparatus 100 according to the present embodiment includes an adhesive layer forming step, a laminating step, an autoclave step, and a UV bonding step.

  In the adhesive layer forming step, the adhesive layer 300 is formed on the image display unit 140. In the laminating process, the emission surface 141 of the image display unit 140 and the phase difference plate 180 are overlapped face to face, and these are pressure-laminated and primarily bonded. In the autoclave process, the image display unit 140 and the phase difference plate 180 are pressurized and heated. Further, in the UV bonding process, the image display unit 140 and the retardation film 180 are secondarily bonded by curing the bonding layer 300.

  FIG. 4 is a schematic cross-sectional view of the image display unit 140 before the adhesive layer forming step. As shown in this figure, the image generation unit 160 of the image display unit 140 is sealed between the light source side glass substrate 142 and the emission side glass substrate 144 and between the light source side glass substrate 142 and the emission side glass substrate 144. A right-eye image generation region 162 and a left-eye image generation region 164 formed by liquid crystal. A light source side polarizing plate 150 is disposed on the light source side of the light source side glass substrate 142, and an output side polarizing plate 170 is disposed on the output side of the output side glass substrate 144. The area of the exit side glass substrate 144 is slightly larger than that of the exit side polarizing plate 170, and the periphery of the exit side glass substrate 144 extends around the exit side polarizing plate 170.

  FIG. 5 is a sectional view showing the adhesive layer forming step. As shown in this figure, in the adhesive layer forming step, an adhesive sheet formed in advance with a resin is attached to the surface of the phase difference plate 180 on the image display unit 140 side, and the adhesive layer 300 is formed. The adhesive sheet is attached to at least the right-eye polarizing region 181 and the left-eye polarizing region 182 of the phase difference plate 180. The right-eye polarization region 181 and the left-eye polarization region 182 face the right-eye image generation region 162 and the left-eye image generation region 164 of the image display unit 140, respectively.

  Here, the resin constituting the adhesive sheet is an ultraviolet curable resin, and examples thereof include urethane acrylate resins such as Three Bond (registered trademark) 1630 of Three Bond (registered trademark). The thickness of the adhesive layer 300 before curing in the adhesive layer forming step can be appropriately set depending on the area of the opening between the light shielding portions 190, the thickness of the light shielding portion 190, and the like. It is preferable that the thickness is equal to or slightly thicker than the thickness. Note that the adhesive layer 300 may be formed by applying a resin to the outgoing side surface of the outgoing side polarizing plate 170. In this case, a die coater, a gravure coater, or the like can be used as a method for applying the resin. Moreover, it is preferable that the resin viscosity in the case of apply | coating resin exists in the range of 500-1000 cps. If the viscosity is less than 500 cps, the applied resin may flow out. On the other hand, if the viscosity is higher than 1000 cps, the resin is difficult to enter between the light shielding portions 190, and the resin may not spread all over.

  Here, the resin used in the adhesive layer forming step is preferably cured by heat as well as cured by ultraviolet rays. As the resin that is cured by both ultraviolet rays and heat, a resin having a functional group having an unsaturated double bond in the side chain and an epoxy group can be used. Moreover, the resin composition which mixed resin hardened | cured with an ultraviolet-ray and resin hardened | cured with a heat | fever may be sufficient.

  In this case, an ultraviolet curable resin such as urethane acrylate or unsaturated polyester acrylate can be used as the resin curable with ultraviolet rays. In addition, as the resin that is cured by heat, an unsaturated polyester resin, diallyl phthalate resin, urethane resin, or the like can be used.

  FIG. 6 is a cross-sectional view showing a step of placing the phase difference plate 180 on the emission surface 141 of the image display unit 140 in the laminating step. As shown in this figure, in this step, a pair of spacer jigs 202 are placed on the emission surface 141 of the image display unit 140. The pair of spacer jigs 202 is an elongated plate material, and one end in the width direction is formed in an arc shape, and is placed on the emission side glass substrate 144 with the arc-shaped curved surface facing upward. . In addition, the pair of spacer jigs 202 are arranged on the emission side glass substrate 144 with the emission side polarizing plate 170 interposed therebetween.

  In the laminating step, next, the phase difference plate 180 is placed on the emission surface 141 so that the surface on which the light shielding portion 190 is formed faces the emission surface 141 vertically. At this time, one edge of the retardation film 180 is placed on one spacer jig 202, and the opposite edge of the one edge of the retardation film 180 is placed on the other spacer jig 202. “Edge”, “opposite side” and “edge angle” described later correspond to “edge” in the claims. That is, the “edge” described in the claims does not necessarily refer to the entire periphery of the phase difference plate 180 but also refers to one side or corner of the phase difference plate 180.

  Next, in the laminating step, the pair of heated rollers 204 are pressed against the surface on the emission side of the phase difference plate 180. The pair of rollers 204 is disposed at a central portion between the pair of edges substantially parallel to the pair of edges of the phase difference plate 180 mounted on the spacer jig 202. Thereby, the phase difference plate 180 bends so that the space | interval with the output surface 141 may spread from the center part between the said pair of edge to the said pair of edge.

  In addition to the method of heating the phase difference plate 180 and the image display unit 140 with the heated roller 204, a method of preheating the phase difference plate 180 and the image display unit 140 before laminating with the heated roller. Is also applicable. According to this method, the retardation plate 180 and the image display unit 140 can be bonded to each other in a state where the hardness of the resin is kept lower without lowering the resin temperature of the adhesive layer 300. Adhesion between 180 and the image display unit 140 can be further increased. In addition, as a method of heating and pressurizing the retardation plate 180 and the image display unit 140, lamination is performed using a method of laminating in a heated chamber, that is, in a heated atmosphere, and a roller 204 heated in the heated atmosphere. A method is mentioned.

  FIG. 7 is a cross-sectional view showing a step of bonding the phase difference plate 180 to the emission surface 141 of the image display unit 140 in the laminating step. As shown in this figure, in this step, the pair of heated rollers 204 are rotationally moved in directions opposite to each other while being pressed against the phase difference plate 180, thereby causing the phase difference plate 180 to move to the exit surface 141. Bonding to the emission surface 141 is performed in order from the side closer to.

  FIG. 8 is a cross-sectional view showing a step of bonding the phase difference plate 180 to the emission surface 141 of the image display unit 140 in the laminating step. As shown in this figure, in this step, when the heated roller 204 moves to the vicinity of the edge on the spacer jig 202 in the phase difference plate 180, the spacer jig 202 is moved to the edge and the emission side glass substrate. 144 is withdrawn from the space. Then, the roller 204 is moved to the edge. As a result, the entire adhesion between the phase difference plate 180 and the exit surface 141 is completed.

  Here, the number of times pressure is applied to the image display unit 140 is reduced by attaching the adhesive sheet to the image display unit 140 side of the phase difference plate 180 and then bonding the phase difference plate 180 to the image display unit 140. The load due to the pressure on the image display unit 140 is reduced. Note that after the adhesive sheet is attached to the phase difference plate 180 side of the image display unit 140, the phase difference plate 180 may be attached to the image display unit 140. In addition, after attaching an adhesive sheet to the image display unit 140 side of the phase difference plate 180, the phase difference plate 180 and the image display unit 140 may be pressed and bonded from both sides in the thickness direction. Further, after the adhesive sheet is attached (placed) on the phase difference plate 180 side of the image display unit 140, the image display unit 140 and the phase difference plate 180 may be pressed and bonded from both sides in the thickness direction.

  In addition, it is preferable that the thickness of the contact bonding layer 300 is the same thickness as the light shielding part 190 after a lamination process. In the laminating step, the roller may be laminated by rotating along the direction in which the right eye image generating area 162 and the left eye image generating area 164 are arranged as shown in the drawing. Lamination may be performed by rotating along the longitudinal direction of the image generation area 162 and the image generation area 164 for the left eye and along the light shielding portion 190. In this case, air easily escapes between the adhesive layer 300 and the phase difference plate 180, and bubbles are less likely to intervene between the adhesive layer 300 and the phase difference plate 180.

  After the laminating step, an autoclave step is performed. In this autoclave process, the image display unit 140 and the phase difference plate 180 are heated in an atmosphere whose pressure is higher than atmospheric pressure.

  By the autoclave process, distortion generated in the image display unit 140 and the phase difference plate 180 by the laminating process is released. Furthermore, the autoclave process can crush or extrude bubbles in the adhesive layer 300 that could not be completely removed in the laminating process.

  FIG. 9 is a sectional view showing the UV bonding process. In the UV bonding step, the adhesive layer 300 after the autoclave step is irradiated with ultraviolet rays from the phase difference plate 180 side to cure the resin of the bonding layer 300. As a result, the region of the resin of the adhesive layer 300 between the light shielding portions 190 of the phase difference plate 180 is irradiated with ultraviolet rays and cured.

  Furthermore, heat is applied to the adhesive layer 300 from the outside with a heater or the like, and the entire adhesive layer 300 is cured. As a result, the resin in the region not irradiated with ultraviolet rays can also be cured, and the image display unit 140 and the retardation plate 180 can be bonded more reliably. Note that ultraviolet irradiation and heating by a heater may be performed in combination.

  The image display unit 140 and the phase difference plate 180 bonded together as described above are attached to the housing 110. Thereby, the stereoscopic image display apparatus 100 is completed.

  Here, in the laminating step in the present manufacturing method, the phase difference plate 180 is bent in such a manner that the retardation plate 180 is bent from the center between the pair of opposing edges to the pair of edges so that the distance from the emission surface 141 is widened. The light was adhered to the light exit surface 141 in order from the side closer to the surface 141 to the side farther from the side. As a result, the air between the phase difference plate 180 and the adhesive layer 300 is placed on the spacer jig 202 while the roller 204 is moved to rotate to adhere the phase difference plate 180 and the emission surface 141. Extruded to the edge side. Accordingly, it is possible to suppress air from being mixed between the phase difference plate 180 and the image display unit 140, and to suppress internal reflection of light between the phase difference plate 180 and the image display unit 140, so that the right eye The occurrence of crosstalk between the image light for the left eye and the image light for the left eye can be suppressed.

  Further, in the laminating step in the present manufacturing method, the pair of edges of the retardation film 180 is placed on the spacer jig 202, and the central portion between the edges of the retardation film 180 is pushed toward the emission surface 141 by the roller 204. The phase difference plate 180 is bent. That is, with a simple configuration in which a rod-shaped spacer jig 202 is sandwiched between a pair of edges of the phase difference plate 180 and the emission surface 141 and the roller 204 is pressed against the phase difference plate 180, the phase difference plate 180 is It is possible to bend into a shape in which air does not easily accumulate between the phase difference plate 180 and the emission surface 141. Therefore, the retardation plate 180 can be bent into the shape after suppressing the manufacturing cost.

  In this manufacturing method, the phase difference plate 180 is bent so that the distance from the emission surface 141 increases from the center side between the pair of opposite sides of the phase difference plate 180 to the pair of opposite sides. However, this is not essential, and for example, the phase difference plate 180 may be bent from the center side to one edge so that the distance from the emission surface 141 is widened. That is, the phase difference plate 180 may be bent from one edge to the opposite side so as to increase the distance from the emission surface 141 and bonded to the emission surface 141 in the order of the opposite side from the one edge. .

  Further, for example, the phase difference plate 180 may be bent so that the distance from the emission surface 141 is widened from the diagonal central portion of the phase difference plate 180 to a pair of diagonals. That is, the phase difference plate 180 may be bonded to the emission surface 141 in the order of the pair of diagonals from the center between the pair of diagonals. In addition, for example, the phase difference plate 180 may be bent so that the distance from the emission surface 141 is widened from the diagonal center portion of the phase difference plate 180 to one edge angle. That is, the phase difference plate 180 may be bonded to the emission surface 141 in the order of the diagonal from one edge angle.

  Further, in this manufacturing method, the pair of rollers is moved from the center side between the pair of opposite sides to the set of opposite sides. However, this is not essential. For example, one roller may be moved from one side toward the opposite side of the one side, or may be reciprocated between a pair of opposite sides.

  Moreover, you may implement the said lamination process in a vacuum environment. In this case, mixing of air between the phase difference plate 180 and the emission surface 141 can be further suppressed. Further, since the resin forming the adhesive layer 300 is degassed, the transparency of the adhesive layer 300 can be improved.

  FIG. 10 is an exploded perspective view showing another stereoscopic image display apparatus 101 manufactured by the manufacturing method of the present embodiment. In the stereoscopic image display apparatus 101 shown in this figure, the same components as those of the stereoscopic image display apparatus 100 are denoted by the same reference numerals and description thereof is omitted. As shown in this figure, the stereoscopic image display apparatus 101 is bonded to an emission surface from which image light is emitted in the image forming apparatus 120 in place of the retardation plate 180 of the stereoscopic image display apparatus 100, and the image forming apparatus 120. A phase difference plate 185 that separates the image light emitted from the light into right-eye image light and left-eye image light whose polarization axes rotate in opposite directions. The retardation plate 185 has a right-eye polarizing region 186 and a left-eye polarizing region 187.

  Here, the right-eye polarizing region 186 and the left-eye polarizing region 187 are both quarter-wave plates, and their optical axes are orthogonal to each other. The positions and sizes of the right-eye polarizing region 186 and the left-eye polarizing region 187 in the retardation plate 185 are similar to the positions and sizes of the right-eye polarizing region 181 and the left-eye polarizing region 182 in the retardation plate 180. This corresponds to the positions and sizes of the right-eye image generation area 162 and the left-eye image generation area 164 of the generation unit 160. Therefore, in the usage state of the stereoscopic image display apparatus 101, the right-eye image light transmitted through the right-eye image generation region 162 is incident on the right-eye polarization region 186, and the left-eye polarization region 187 is incident on the left-eye polarization region 187. Left-eye image light that has passed through the image generation region 164 enters.

  Further, a light shielding unit 190 is provided at the boundary between the right-eye polarizing region 186 and the left-eye polarizing region 187 on the surface of the retardation film 185 facing the image display unit 140. The light shielding portion 190 is an image that enters the right-eye polarization region 186 beyond the boundary among the left-eye image light that should be incident on the left-eye polarization region 187 adjacent to the right-eye polarization region 186 of the phase difference plate 185. Absorbs and blocks light.

  Similarly, the light-shielding unit 190 includes the left-eye polarization region that exceeds the boundary of the right-eye image light to be incident on the right-eye polarization region 186 adjacent to the left-eye polarization region 187 of the phase difference plate 185. The image light incident on 187 is absorbed and blocked. Thus, by providing the light shielding portion 190 at the boundary of the phase difference plate 185, crosstalk hardly occurs in the right-eye image light and the left-eye image light emitted from the stereoscopic image display apparatus 101. In addition, the upper and lower viewing angles are widened.

  The phase difference plate 185 emits the incident light as circularly polarized light whose rotation directions of the polarization axes are opposite to each other. For example, the right-eye polarization region 186 emits incident light as clockwise circularly polarized light, and the left-eye polarization region 187 emits incident light as counterclockwise circularly polarized light. In addition, the arrow of the phase difference plate 185 in FIG. 10 indicates the rotation direction of the polarized light that has passed through the phase difference plate 185. For the right-eye polarizing region 186, for example, a quarter-wave plate whose optical axis is in the horizontal direction is used, and for the left-eye polarizing region 187, for example, a quarter-wave plate whose optical axis is in the vertical direction is used.

  When observing the stereoscopic image display apparatus 101, the observer 500 observes by wearing polarized glasses in which a quarter-wave plate and a polarizing lens are arranged at a position corresponding to the right eye 512 and a position corresponding to the left eye 514, respectively. In this polarized glasses, the quarter-wave plate disposed at the position corresponding to the right eye 512 side of the viewer 500 has a horizontal optical axis and is disposed at the position corresponding to the left eye 514 side of the viewer 500. Has a vertical optical axis. Further, both of the polarizing lens arranged at the position corresponding to the right eye 512 side of the observer 500 and the polarizing lens arranged at the position corresponding to the left eye 514 side of the observer 500 have the transmission axis direction diagonally right when viewed from the observer 500. It is 45 degrees, and the absorption axis direction is a direction orthogonal to the transmission axis direction.

  On the right eye 512 side of the viewer 500, when the circularly polarized light whose polarization axis is clockwise when viewed from the viewer 500 is incident, the circularly polarized light is tilted to the right by the ¼ wavelength plate whose horizontal axis is the optical axis. After being converted into 45-degree linearly polarized light, the light passes through the polarizing lens and is observed with the right eye 512 of the viewer 500. On the left eye 514 side of the observer 500, when circularly polarized light whose polarization axis is counterclockwise when viewed from the observer 500 is incident, the circularly polarized light is reflected by the quarter wavelength plate whose optical axis is the vertical direction. After being converted into linearly polarized light having an oblique right angle of 45 degrees, the light passes through the polarizing lens and is observed by the left eye 514 of the observer 500. In this way, by observing the stereoscopic image display apparatus 101 while wearing the polarizing glasses, the observer 500 observes only the right eye image light with the right eye 512 and only the left eye image light with the left eye 514. The image displayed on the stereoscopic image display apparatus 100 can be recognized as a stereoscopic image.

  Here, also in the stereoscopic image display apparatus 101, as in the stereoscopic image display apparatus 100, the image display unit 140, the phase difference plate 185, and the image display unit 140 are bonded. Thereby, it can suppress that air mixes between the image display part 140 and the phase difference plate 180, and can suppress internal reflection of the light between these, Therefore The image light for right eyes and the image light for left eyes And crosstalk can be suppressed.

  In FIG. 11, the lamination process in the other manufacturing method of this embodiment is shown with sectional drawing. As shown in this figure, in the laminating step, the image display unit 140 is placed on the lower plate 900 so that the output-side polarizing plate 170 faces upward, the retardation plate 180 faces the light shielding portion 190 downward. As shown in FIG. In this state, the image display unit 140 and the phase difference plate 180 are positioned. The lower board 900 and the upper board 910 are arranged to face each other in the vertical direction, and the upper board 910 can be brought into contact with and separated from the lower board 900. In the present manufacturing method, the adhesive layer 300 is formed on the incident side surface of the retardation plate 180.

  The upper plate 910 is a hollow box whose inside is evacuated, and the upper plate 910 has a porous plate 912 formed with a large number of holes vertically and horizontally facing the upper surface of the lower plate 900. It is arranged. That is, the phase difference plate 180 is attracted to the pasting surface 914 of the porous plate 912 facing the lower plate 900 by the suction force generated in the holes formed in the porous plate 912.

  Here, the porous plate 912 has flexibility and can be bent in the thickness direction of the retardation film 180. In addition, a pair of bending imparting members 902 are provided so as to project toward the upper board 910 on both sides of the image display unit 140 of the lower board 900. The pair of deflection imparting members 902 are elongated plate members and extend along a pair of opposite sides of the image display unit 140. Further, the pair of bending imparting members 902 are movable along the moving direction of the upper board 910.

  FIG. 12 is a cross-sectional view showing a state in which the phase difference plate 180 is pressed against the image display unit 140 in the laminating process. As shown in this figure, in the laminating step, the upper end of the deflection imparting member 902 protrudes toward the upper board 910 from the exit surface (that is, the adhesive surface) of the phase difference plate 180 in a state of being pressed against the image display unit 140. Let That is, the upper board 910 is lowered to the lower board 900 side in a state where the pair of deflection imparting members 902 are in contact with both sides of the pair of opposite sides of the retardation plate 180 in the porous plate 912. As a result, the center side of the porous plate 912 descends toward the lower plate 900, while the pair of opposite sides that contact the deflection applying member 902 of the porous plate 912 stops descending. For this reason, the perforated plate 912 is bent so that the distance from the lower plate 900 is widened from the center between the pair of opposite sides with which the deflection imparting member 902 comes into contact to the set of opposite sides, and the sticking surface 914 is curved. Therefore, the phase difference plate 180 bends following the pasting surface 914.

  FIG. 13 is a cross-sectional view showing a state in which the phase difference plate 180 is pressed against the image display unit 140 in the laminating process. As shown in this figure, in the laminating step, the center of the retardation plate 180 is brought into contact with the emission surface 141, and then the deflection applying member 902 is lowered. As a result, the pair of edges of the perforated plate 912 with which the bend imparting member 902 contacts are lowered, so that the amount of flexure of the perforated plate 912 and the phase difference plate 180 is reduced, and the phase difference plate 180 and the exit surface 141 are reduced. The bonding range extends to the side of the pair of edges.

  FIG. 14 is a cross-sectional view showing a state where the adhesion between the phase difference plate 180 and the image display unit 140 is completed in the laminating process. As shown in this figure, in the laminating process, after the central portion of the retardation film 180 is brought into contact with the emission surface 141, the upper end of the deflection imparting member 902 is lowered below the emission surface 141. As a result, the upper end of the deflection imparting member 902 is separated from the porous plate 912, the deflection of the porous plate 912 and the retardation plate 180 is eliminated, and the entire incident side surface of the retardation plate 180 is bonded to the emission surface 141.

  As described above, in the laminating process in this manufacturing method, both edges of the porous plate 912 sandwiching the pair of edges of the phase difference plate 180 are placed on the deflection applying member 902, and the central portion between the both edges of the porous plate 912 is emitted. By pushing to the surface 141 side, the phase difference plate 180 is bent. That is, a plate-like deflection imparting member 902 that protrudes from the emission surface 141 toward the porous plate 912 side is interposed between the both edges of the porous plate 912 having flexibility and the lower plate 900, so that the porous plate 912 is disposed. The phase difference plate 180 can be bent into a shape in which air does not easily accumulate between the phase difference plate 180 and the emission surface 141 with a simple configuration in which the lower plate 900 is approached. Therefore, the retardation plate 180 can be bent into the shape after suppressing the manufacturing cost.

  In addition, when the adhesive layer 300 is formed on the retardation plate 180 by causing the deflection applying member 902 to contact the perforated plate 912 and not contacting the retardation plate 180, Adhesion of the adhesive to the deflection applying member 902 can be prevented. Further, the retardation plate 180 can be prevented from being damaged by the contact between the deflection applying member 902 and the retardation plate 180.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

A stereoscopic image display device 100 manufactured by the manufacturing method of the present embodiment is shown in an exploded perspective view. A use state of the stereoscopic image display apparatus 100 is shown in a plan view. A stereoscopic image display device 100 housed in a housing 110 is shown in a sectional view. The image display part 140 before a lamination process is shown with sectional drawing. An adhesive layer formation process is shown with a sectional view. The lamination process is shown in a cross-sectional view. The lamination process is shown in a cross-sectional view. The lamination process is shown in a cross-sectional view. The UV bonding process is shown in a sectional view. It is a disassembled perspective view of the other three-dimensional image display apparatus 101 manufactured by the manufacturing method of this embodiment. The lamination process in another manufacturing method is shown with sectional drawing. The lamination process in another manufacturing method is shown with sectional drawing. The lamination process in another manufacturing method is shown with sectional drawing. The lamination process in another manufacturing method is shown with sectional drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Stereoscopic image display apparatus, 101 Stereoscopic image display apparatus, 110 Case, 120 Image forming apparatus, 130 Light source, 140 Image display part, 141 Output surface, 142 Light source side glass substrate, 144 Output side glass substrate, 150 Light source side polarizing plate , 160 Image generation unit, 162 Right-eye image generation region, 164 Left-eye image generation region, 165 Outer frame, 170 Emission side polarizing plate, 180 Phase plate, 181 Right-eye polarization region, 182 Left-eye polarization region, 183 Base material , 185 retardation plate, 186 right-eye polarization region, 187 left-eye polarization region, 190 light-shielding part, 200 antireflection layer, 202 spacer jig, 204 roller, 220 polarizing glasses, 232 right-eye image transmission part, 234 left-eye image Transmission part, 300 adhesive layer, 500 observer, 512 right eye, 514 left eye, 900 lower board, 02 deflector bar, 910 the upper plate, 912 perforated plate 914 application surface

Claims (4)

An image forming apparatus having a plurality of pixels arranged two-dimensionally and forming image light having a single polarization direction, and the image forming apparatus bonded to an output surface from which image light is emitted in the image forming apparatus The image light emitted from the apparatus is separated into right-eye image light and left-eye image light having polarization directions orthogonal to each other, or right-eye image light and left-eye image light whose polarization axis rotation directions are opposite to each other. A method for manufacturing a stereoscopic image display device including a phase difference plate,
The retardation plate is bonded to the emission surface in order from the side closer to the emission surface in a state where the retardation plate is bent so that the distance from the emission surface is widened from the center side to the edge side. A method for manufacturing a stereoscopic image display device.   In a state where a spacer jig protruding from the adhesive surface between the retardation plate and the exit surface is sandwiched between the edge of the retardation plate and the exit surface, the retardation plate is The method for manufacturing a stereoscopic image display device according to claim 1, wherein the three-dimensional image display device is bonded to the emission surface in order from the side closer to the emission surface. Affixing and holding the phase difference plate on the attaching surface of the holding portion disposed facing the emission surface,
In the state where the pasting surface is curved so that the distance from the emitting surface is widened from the center side to the edge side, the pasting surface is pressed against the emitting surface in order from the side closer to the emitting surface. A method for manufacturing a stereoscopic image display device according to claim 1.   The method for manufacturing a stereoscopic image display device according to claim 1, wherein the retardation plate is bonded to the emission surface in a vacuum environment.

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