JP4482588B2 - Stereoscopic image display device and manufacturing method thereof - Google Patents

Description

  The present invention relates to a stereoscopic image display device and a manufacturing method thereof. The present invention particularly relates to a stereoscopic image display device having a wide viewing angle and a method for manufacturing the same.

Conventionally, a stereoscopic image display device in which a liquid crystal display and a retardation plate are combined is known (see, for example, Patent Document 1). In this stereoscopic display device, a retardation plate is attached to a viewer-side polarizing plate in a liquid crystal display using an adhesive or an adhesive.
Japanese Patent Laid-Open No. 10-253824

  However, when the liquid crystal display is large, it is difficult to maintain the parallelism between the liquid crystal display and the retardation plate due to the liquid crystal display being bent. Further, when a plurality of light shielding portions are discretely provided on the surface of the phase difference plate on the liquid crystal display side, it is flat when the phase difference plate is attached to the liquid crystal display due to unevenness due to the presence or absence of the light shielding portions. The degree becomes lower. When the parallelism and flatness between the liquid crystal display and the retardation plate are lowered, there is a problem that moire occurs.

  In order to solve the above-described problem, in the first embodiment of the present invention, the image generation unit includes a right-eye image generation region that generates right-eye image light and a left-eye image generation region that generates left-eye image light. An image display unit that emits right-eye image light and left-eye image light as linearly polarized light whose polarization axes are parallel to each other, and a right-eye polarization region, a left-eye polarization region, and a right-eye The right-eye polarizing region and the left-eye polarizing region, which are arranged on the incident-side surface at the boundary between the polarizing region for the left eye and the polarizing region for the left eye, and have a light shielding portion that blocks the incident right-eye image light and left-eye image light. When the right-eye image light and the left-eye image light are respectively incident, the incident right-eye image light and left-eye image light are linearly polarized with the polarization axes orthogonal to each other, or the rotation directions of the polarization axes are opposite to each other. As circularly polarized light A method of manufacturing a stereoscopic image display device having a radiating phase difference plate, wherein the right side image is generated on at least one of an emission side surface of the image display unit and an incident side surface of the phase difference plate A region where the region and the left-eye image generation region overlap the region where the right-eye polarization region and the left-eye polarization region of the retardation plate overlap, and a surface on the exit side of the image display unit after the coating step, Laminating process for laminating the image display unit and phase difference plate, and the resin between the image display unit and the phase difference plate laminated in the laminating process is cured by facing and overlapping the incident side surface of the phase difference plate By this, a manufacturing method provided with the adhesion process which adhere | attaches an image display part and a phase difference plate is provided.

  In the second aspect of the present invention, the image processing unit includes an image generation unit including a right eye image generation region for generating right eye image light and a left eye image generation region for generating left eye image light, and the right eye image light and the left eye image An image display unit that emits light as linearly polarized light whose polarization axes are parallel to each other, and a right-eye polarization region and a left-eye polarization region that are arranged on the output side of the image display unit and have a right-eye polarization region and a left-eye polarization region When the right-eye image light and the left-eye image light are incident on the region, the incident right-eye image light and left-eye image light are linearly polarized light whose polarization axes are orthogonal to each other, or the rotation directions of the polarization axes are opposite to each other. The phase difference plate that emits as circularly polarized light, and the right eye image generation region and the left eye image generation region of the image display unit, and the right eye polarization region and the left eye polarization region of the phase difference plate are arranged in an overlapping area to display an image. And an adhesive layer that adheres the incident-side surface of the retardation plate, and the retardation plate is a boundary between the right-eye polarizing region and the left-eye polarizing region and is disposed on the incident-side surface. Thus, a stereoscopic image display device having a light-shielding portion that shields the incident right-eye image light and left-eye image light and the adhesive layer having the same thickness as the light-shielding portion is provided.

  In the third aspect of the present invention, there is provided an image generation unit including a right eye image generation region for generating right eye image light and a left eye image generation region for generating left eye image light, and the right eye image light and the left eye image An image display unit that emits light as linearly polarized light whose polarization axes are parallel to each other, and a right-eye polarization region, a left-eye polarization region, and a right-eye polarization region and a left-eye polarization region that are arranged on the emission side of the image display unit Is disposed on the incident-side surface and has a light-shielding portion that blocks the incident right-eye image light and left-eye image light, and the right-eye image light and the left-eye polarization region in the right-eye polarization region and the left-eye polarization region. When image light is incident, the incident right-eye image light and left-eye image light are emitted as linearly polarized light whose polarization axes are orthogonal to each other, or circularly polarized light whose polarization axes are in opposite directions. Having a phase difference plate A method for manufacturing a body image display device, comprising at least one of an exit-side surface of an image display unit and an entrance-side surface of a phase difference plate, the right-eye image generation region and the left-eye image generation region of the image display unit Adhering step of adhering an adhesive sheet containing a curable resin to a region where the right-eye polarizing region and left-eye polarizing region of the phase difference plate overlap, and after the attaching step, the exit side surface and the phase difference plate of the image display unit By laminating the surface on the incident side facing each other, laminating the image display unit and the phase difference plate, and curing the resin between the image display unit and the phase difference plate laminated in the lamination step, There is provided a manufacturing method including an adhesion step of adhering an image display unit and a phase difference plate.

  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 of a stereoscopic image display device 100 manufactured by the manufacturing method of the present embodiment. As shown in FIG. 1, the stereoscopic image display device 100 includes a light source 120, an image display unit 130, a retardation plate 180, and an antireflection layer 200 in this order. The image display unit 130 includes a light source side polarizing plate 150, an image generation unit 160, and an emission side polarizing plate 170. When a viewer 500 to be described later observes a stereoscopic image displayed on the stereoscopic image display device 100, the stereoscopic image is observed from the right side of the antireflection layer 200 in FIG.

  The light source 120 is arranged on the farthest side of the stereoscopic image display device 100 when viewed from the observer 500 and is in a state where the stereoscopic image display device 100 is used (hereinafter, abbreviated as “usage state of the stereoscopic image display device 100”). ), White non-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 120, but 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 120 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 120 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 45 degrees from the horizontal direction when the observer 500 views the stereoscopic image display device 100 as indicated by an arrow in FIG.

  The image generation unit 160 includes a right eye image generation area 162 and a left eye image generation area 164. As shown in FIG. 1, the right eye image generation area 162 and the left eye image generation area 164 are areas obtained by dividing the image generation unit 160 in the horizontal direction, and a plurality of right eye image generation areas 162 and left eye image generation areas 164 are vertical. Staggered in the 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 light”). For short). Similarly, when the light transmitted through the light source side polarizing plate 150 enters 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 light”). For short).

  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 example shown in FIG. 1, the polarization axes are both set to the same direction as the transmission axis in the output-side polarizing plate 170 described later. Has been. 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 emission side polarizing plate 170 is disposed on the viewer 500 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 the transmission axis. Transmits parallel light and blocks light whose polarization axis is parallel to the absorption axis. Here, the direction of the transmission axis in the output-side polarizing plate 170 is 45 degrees from the horizontal direction when the observer 500 views the stereoscopic image display device 100 as indicated by an arrow in FIG.

  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 image generation is performed on the left-eye polarization region 182. The left-eye image light transmitted through the region 164 is incident. 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 130. 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 directions of 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 opposite, as indicated by arrows in FIG. Orthogonal. In addition, the arrow in the phase difference plate 180 in FIG. 1 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 FIG. 1, the direction of the optical axis of the left-eye polarizing region 182 is the horizontal direction or the 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 illustrating a usage state of the stereoscopic image display apparatus 100. When observing a stereoscopic image by the stereoscopic image display device 100, the observer 500 puts the right eye image light and the left eye image light projected from the stereoscopic image display device 100 on the polarizing glasses 220 as shown in FIG. Observe. 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 the right-eye image light transmitted through the right-eye polarization region 181 and the absorption axis direction orthogonal to the transmission axis direction. 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. 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 the observer 500 observes a stereoscopic image with the stereoscopic image display device 100, the right-eye image light and the left-eye image light transmitted through the right-eye polarizing region 181 and the left-eye polarizing region 182 of the retardation plate 180 are emitted. Within the range, the stereoscopic image display apparatus 100 is observed with the polarizing glasses 220 as described above. Accordingly, only the right eye image light can be observed with the right eye 512, and only the left eye image light can be observed with the left eye 514. Therefore, the observer 500 can recognize these right-eye image light and left-eye image light as a stereoscopic image.

  FIG. 3 is a schematic cross-sectional view of the stereoscopic image display device 100 accommodated in the housing 110. As shown in FIG. 3, the image display unit 130 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 130. The housing 110 houses the light source 120 and the image display unit 130. Here, the retardation film 180 is bonded to the image display unit 130 by the adhesive layer 300. 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 from the incident-side surface of 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 in the application process of the adhesive layer 300.

  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 application process for applying a resin to the image display unit 130, a mounting process for mounting the retardation plate 180 on the image display unit 130, and degassing the resin. A deaeration process, a laminating process for laminating the image display unit 130 and the phase difference plate 180, and an adhesion process for bonding the image display unit 130 and the phase difference plate 180 by curing the resin.

  FIG. 4 is a schematic cross-sectional view of the image display unit 130 before the coating process. The image generation unit 160 of the image display unit 130 of FIG. 4 is formed by a light source side glass substrate 142 and an emission side glass substrate 144 and liquid crystal sealed between the light source side glass substrate 142 and the emission side glass substrate 144. A right eye image generation area 162 and a left eye image generation area 164. 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.

  FIG. 5 is a cross-sectional view illustrating the coating process. In the coating process, resin is applied to the exit-side surface of the exit-side polarizing plate 170 in the image display unit 130 to form the adhesive layer 300. Here, the resin is applied to at least a region where the right-eye image generation region 162 and the left-eye image generation region 164 of the image display unit 130 and the right-eye polarization region 181 and the left-eye polarization region 182 of the phase difference plate 180 face each other. The Instead, it may be applied to the entire surface of the output side polarizing plate 170. As a method for applying the resin, a die coater, a gravure coater or the like is used. Further, the image display unit 130 may be placed in a vacuum furnace, and the resin may be applied in a state where the vacuum furnace is decompressed. Thereby, resin can be deaerated and transparency and adhesiveness can be improved. Further, after applying the resin, the resin may be deaerated by applying ultrasonic vibration to the image display unit 130. The thickness of the adhesive layer 300 before curing in the coating process may be the same as or thinner than the thickness of the light shielding portion 190. The thickness of the adhesive layer 300 before curing in the coating process 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.

  The resin used in the coating step is preferably cured with ultraviolet light and cured with heat. 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. Further, a resin that is cured by ultraviolet rays and a resin that is cured by heat may be mixed and applied. 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. The viscosity of the resin is preferably 500 cps to 1000 cps at normal temperature (25 ° C.). 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 be spread all over.

  FIG. 6 is a cross-sectional view illustrating the mounting process. In the placing step, the image display unit 130 is placed so as to overlap the surface on which the adhesive layer 300 is formed so that the surface on which the light shielding unit 190 of the phase difference plate 180 is formed faces each other. In a state where the phase difference plate 180 is placed on the image display unit 130, the image display unit 130 and the phase difference plate 180 are arranged in a vacuum furnace, and the vacuum furnace is depressurized to degas the resin. A degassing step is performed. In the deaeration process, the resin may be deaerated by applying ultrasonic vibration to the image display unit 130 and the phase difference plate 180.

  As shown in FIG. 6, the right-eye polarizing region 181 and the left-eye polarizing region 182 of the retardation plate 180 are supported by the glass substrate 183. Since the glass substrate 183 of the phase difference plate 180 is thicker than the emission side glass substrate 144 of the image display unit 130 and the entire phase difference plate 180 and the image display unit 130 are bonded together, the emission side glass is maintained while maintaining the strength. The substrate 144 can be thinned. As a result, the viewing angle can be expanded by reducing the distance between the image generation unit 160 of the image display unit 130 and the right-eye polarization region 181 and the left-eye polarization region 182 of the phase difference plate 180. For example, when the thickness of the glass substrate 183 is 0.7 mm, the thickness of the emission side glass substrate 144 can be 0.5 mm or less.

  FIG. 7 is a cross-sectional view illustrating a laminating process. In the laminating step, the image display unit 130 and the retardation plate 180 after the placing step are placed on the placing table 610 with the retardation plate 180 facing upward. Further, the roller 600 rotates while pressing the glass substrate 183 of the phase difference plate 180, whereby the image display unit 130 and the phase difference plate 180 are laminated. Thereby, the thickness of the adhesive layer 300 can be made uniform, and the flatness and parallelism of the image display unit 130 and the phase difference plate 180 can be increased. After the laminating process, the thickness of the adhesive layer 300 is preferably the same as that of the light shielding portion 190. In the laminating step, the roller may be rotated and laminated 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 FIG. 7, or the direction perpendicular to FIG. You may laminate by rotating along the longitudinal direction of the image generation area 162 and the left eye image generation area 164. After the laminating step, the image display unit 130 and the phase difference plate 180 may be aligned. In this case, the alignment can be facilitated by mixing the silica filler in the adhesive layer 300 as a spacer. In addition, you may perform an application | coating process, a mounting process, and a lamination process in the vacuum furnace under pressure reduction. Thereby, it can deaerate more effectively and productivity improves.

FIG. 8 is a cross-sectional view illustrating the bonding process. In the bonding step, the adhesive layer 300 after the laminating step is irradiated with ultraviolet rays from the phase difference plate 180 side to cure the resin of the bonding layer 300. In this case for example, the illuminance 180 mW / cm ^2, accumulated light quantity 3000 mJ / cm ^2, irradiation with ultraviolet rays having a wavelength of 365 nm. 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 130 and the phase difference plate 180 can be bonded more reliably. Note that ultraviolet irradiation and heating by a heater may be performed simultaneously.

  The image display unit 130 and the phase difference plate 180 bonded together as described above are attached to the housing 110 shown in FIG. As described above, according to the present embodiment, the image display unit 130 and the phase difference plate 180 include at least the right eye image generation region 162 and the left eye image generation region 164 of the image display unit 130 and the right eye polarization region of the phase difference plate 180. It is bonded by a resin applied to a region where 181 and the left-eye polarizing region 182 overlap. Thereby, since the image display part 130 and the phase difference plate 180 can be closely approached and fixed, a viewing angle can be expanded.

  FIG. 9 shows an example of the antireflection layer 200. The stereoscopic image display device 100 includes the antireflection layer 200 on the viewer 500 side of the phase difference plate 180. The antireflection layer 200 has an adhesive layer 202, a base material 204, a hard coat 206, a high refractive index resin 208, and a low refractive index resin 210 in this order on the glass substrate 183 of the retardation plate 180. The thickness of the adhesive layer 202 is, for example, 25 μm. Moreover, the base material 204 is triacetyl cellulose (TAC), for example, and thickness is 80 micrometers. The thickness of the hard coat 206 is, for example, 5 μm. The refractive indexes of the high refractive index resin 208 and the low refractive index resin 210 are 1.65 and 1.40, respectively, and the thicknesses are each 0.1 μm.

  FIG. 10 is an exploded perspective view of another stereoscopic image display apparatus 101 manufactured by the manufacturing method of the present embodiment. In the stereoscopic image display apparatus 101 shown in FIG. 10, 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 FIG. 10, the stereoscopic image display device 101 includes a retardation plate 185 instead of the retardation plate 180 of the stereoscopic image display device 100. 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 position and size of the right eye image generation area 162 and the left eye image generation area 164 of the generation unit 160. Accordingly, 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 image generation region is input to the left-eye polarization region 187. The image light for the left eye that has passed through 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 130. 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.

  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. 8 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.

  Also in the stereoscopic image display apparatus 101 shown in FIG. 10, as in the stereoscopic image display apparatus 100, the image generation unit 160 and the retardation plate 185 are bonded by the adhesive layer 300. Thereby, since the image generation part 160 and the phase difference plate 185 can be closely approached and fixed, a viewing angle can be expanded.

  When observing the stereoscopic image display apparatus 101 provided with the phase difference plate 185 shown in FIG. 10, the observer 500 has a quarter wavelength plate and a polarizing lens disposed at a position corresponding to the right eye 512 side and a position corresponding to the left eye 514 side, respectively. Observe with polarized glasses. 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. Is the vertical direction of the 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.

  When the observer 500 observes the stereoscopic image display apparatus 101 wearing the above-described polarizing glasses, on the right eye 512 side of the observer 500, when circularly polarized light whose polarization axis is clockwise as viewed from the observer 500 is incident, The circularly polarized light is converted into linearly polarized light having an angle of 45 degrees to the right by a ¼ wavelength plate whose horizontal axis is the horizontal direction, and then transmitted through the polarizing lens and observed by the right eye 512 of the observer 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 with the polarizing glasses, the right eye 512 can observe only the right eye image light, and the left eye 514 can observe only the left eye image light. . Therefore, the observer 500 can recognize these right-eye image light and left-eye image light as a stereoscopic image.

  As described above, according to the present embodiment, the image display unit 130 and the phase difference plates 180 and 185 include at least the right eye image generation region 162 and the left eye image generation region 164 of the image display unit 130 and the phase difference plates 180 and 185. The right-eye polarizing regions 181 and 186 and the left-eye polarizing regions 182 and 187 are bonded to each other by a resin applied to the overlapping region. Thereby, since the image display part 130 and the phase difference plate 180 can be closely fixed, a viewing angle can be expanded or the width | variety of a light shielding layer can be narrowed and a brightness | luminance can be improved.

In the above embodiment, the following Comparative Example 1, Example 1 and Example 2 were used in order to evaluate the widening of the viewing angle and the improvement in luminance.
<Comparative Example 1>
In Comparative Example 1, the thickness of the emission side glass substrate 144 of the image display unit 130 and the thickness of the emission side polarizing plate 170 were set as shown in Table 1 (unit: mm). Further, the pitch of the light shielding portions 190 of the phase difference plate 180 is 0.270 mm, the thickness of the light shielding portions 190 (that is, the length in the normal direction of the surface of the phase difference plate 180) is 0.015 mm, and each light shielding portion 190 is. (That is, the length in the direction along the surface of the phase difference plate 180) was set as shown in Table 1. Furthermore, the thickness of the adhesive layer 300 was set to 0.015 mm which is the same as the thickness of the light shielding portion 190. In Comparative Example 1, the viewing angle was evaluated.

  The viewing angle means a range of angles with respect to the normal direction of the phase difference plate 180 or the like where no crosstalk occurs between adjacent pixels. In this embodiment, the viewing angle was evaluated as follows.

FIG. 11 is a side view of the phase difference plate 180 and the image display unit 130 for explaining the viewing angle. First, the observation distance d, that is, the distance from the light source side surface of the emission side glass substrate 144 of the image display unit 130 to the viewer 530 is set to 700 mm, and the right eye of the image display unit 130 at the same position in the horizontal direction as the viewer 530. On the straight lines l ₁ and l ₂ connected from the boundary between the image generation region 162 and the left eye image generation region 164 adjacent thereto to the viewer 530, the right eye polarization region 181 and the left eye polarization region adjacent thereto on the phase difference plate 180. The position and pitch of 182 are set. Further, a straight line l ₆ passing through the boundary between the right eye image generation region 162 and one of the left eye image generation region 164 adjacent to the right eye image generation region 162 and the one end of the light shielding unit 190 corresponding to the boundary is a horizontal line. The angle formed with k is θ1. FIG. 11 shows the position of the observer 540 who observes the right eye image generation region 162 at the angle θ1. Further, the boundary between the right eye image generation region 162 and the one of the left eye image generation region 164 adjacent to the right eye image generation region 162 and the boundary between the corresponding right eye polarization region 181 and the left eye polarization region 182 adjacent to the boundary. straight l ₂ through which, and θ2 the angle formed with the horizontal line k. The viewing angle was the sum of these θ1 and θ2. The aperture ratio was calculated by (1− (width of each light shielding portion 190 / pitch of the phase difference plate 180)) × 100. When the left eye image generation region 164 is arranged at the same position in the horizontal direction as the observer 530, the role of the right eye image generation region 162 and the left eye image generation region 164 in the above calculation, and the right eye polarization region The roles of 181 and left-eye polarization region 182 may be interchanged.

  In Example 1, the thickness of the exit side glass substrate 144 of the image display unit 130 was set as shown in Table 1, and the other conditions were set to be the same as those in Comparative Example 1. That is, the aperture ratio of Example 1 was set to be the same as the aperture ratio of Comparative Example 1. For Example 1, as in Comparative Example 1, θ1, θ2, and viewing angle were calculated.

  In Example 2, the thickness of the emission-side glass substrate 144 of the image display unit 130 and the width of each light shielding unit 190 of the image display unit 130 are set as shown in Table 1, and other conditions are the same as those in Comparative Example 1 above. Set to. Here, the width of the light shielding portion 190 was set so that the viewing angle of Example 2 was the same as the viewing angle of Comparative Example 1. In Example 2, the aperture ratio was calculated in the same manner as in Comparative Example 1.

  As apparent from Table 1 above, in Example 1, a viewing angle of about 1.8 times (8.01 / 4.39) the viewing angle of Comparative Example 1 was obtained. In Example 2, an aperture ratio of about 1.5 times (72.7 / 49.9) the aperture ratio of Comparative Example 1 was obtained. That is, in Example 2, the luminance of about 1.5 times the luminance of Comparative Example 1 was obtained.

  As described above, according to the present embodiment, the image display unit 130 and the phase difference plates 180 and 185 include at least the right eye image generation region 162 and the left eye image generation region 164 of the image display unit 130 and the phase difference plates 180 and 185. The right-eye polarizing regions 181 and 186 and the left-eye polarizing regions 182 and 187 are bonded to each other by a resin applied to the overlapping region. Thereby, since the image display part 130 and the phase difference plate 180 can be closely approached and fixed, a viewing angle can be expanded. Furthermore, compared with the case where there is an air layer between the image display unit 130 and the phase difference plates 180 and 185, internal reflection between the image display unit 130 and the phase difference plates 180 and 185 can be suppressed. Thus, crosstalk can be reduced. In particular, when the image display unit 130 is large, even if the entire image display unit 130 bends, the adhesive layer 300 and the retardation plates 180 and 185 can follow this bending. Generation of moire between the phase difference plates 180 and 185 can be prevented. Further, since the resin is cured after the laminating process, the thickness of the adhesive layer 300 can be made uniform, and the flatness and parallelism of the image display unit 130 and the phase difference plates 180 and 185 can be increased. Furthermore, by reducing the distance between the image display unit 130 and the phase difference plates 180 and 185, the width of each light shielding unit 190 can be reduced while maintaining the viewing angle at the same level as before the distance is reduced. Thereby, the opening part between the light-shielding parts 190 can be expanded, and the brightness | luminance of a screen can be improved.

  FIG. 12 is a cross-sectional view illustrating a pasting process in another manufacturing method of the present embodiment. The said other manufacturing method has a sticking process instead of the application | coating process in the manufacturing method shown in FIGS. The other manufacturing method further includes a heating step. About the other manufacturing method, about the same structure and effect | action as the manufacturing method shown in FIGS. 1-11, the same reference number is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 12, the attaching step includes a step of attaching the adhesive sheet 700 to the incident side surface of the phase difference plate 180. Here, the adhesive sheet 700 includes a resin layer 720 and a separate film 710 that supports the resin layer 720. The resin layer 720 is an ultraviolet curable resin, and examples thereof include urethane acrylate resins such as ThreeBond (registered trademark) 1630 manufactured by ThreeBond (registered trademark). In the example shown in FIG. 12, the adhesive sheet 700 is attached to the retardation plate 180 by placing the resin layer 720 side of the adhesive sheet 700 on the surface of the retardation plate 180 where the light shielding portion 190 is provided. Note that the adhesive sheet 700 may be drawn and cut by the amount attached from the state wound in a roll shape, or may be formed in advance in a single sheet shape. Here, when the thickness of the light shielding part 190 is 3 to 10 μm, the thickness of the resin layer of the adhesive sheet 700 is preferably 15 to 75 μm. Thereby, resin spreads also to the recessed part between the light shielding parts 190, and the surface can be smoothed.

  FIG. 13 is a cross-sectional view for explaining the sticking process following FIG. As shown in FIG. 13, the attaching step further includes pressing the heated roller 800 against the side of the separate film 710 of the adhesive sheet 700 attached to the incident side surface of the phase difference plate 180, thereby causing the adhesive sheet 700 to undergo the phase difference. And laminating the plate 180. In the process shown in FIG. 13, the heated roller 800 is 0.3 m / min in the arrow direction in the figure on the resin layer 720 of the adhesive sheet 700 in a chamber having an atmospheric temperature of 80 ° C. and atmospheric pressure (0.1 MPa). By moving while rolling at a speed, lamination is performed, and the adhesive sheet 700 is temporarily bonded to the phase difference plate 180. By laminating with the heated roller 800, the resin layer 720 is buried along the uneven shape depending on the presence or absence of the light shielding portion 190, and the resin layer 720 is disposed on the entire incident side of the phase difference plate 180.

  FIG. 14 is a cross-sectional view for explaining the pasting process subsequent to FIG. As shown in FIG. 14, the attaching step further includes a step of peeling the separated film 710 of the laminated adhesive sheet 700 from the resin layer 720. Thereby, the resin layer 720 remains on the phase difference plate 180 side in a state where the resin layer 720 is exposed.

  FIG. 15 is a cross-sectional view showing a step of placing the retardation film 180 on the image display unit 130 in the laminating step following the pasting step. As shown in FIG. 15, the resin layer 720 exposed in the process of FIG. 14 is overlapped with the emission-side polarizing plate 170 of the image display unit 130. Here, positioning between the phase difference plate 180 and the image display unit 130 is performed. In positioning, the phase difference plate 180 may be peeled off from the image display unit 130 a plurality of times and may be overlapped. However, since the resin layer 720 is laminated on the phase difference plate 180, the phase difference plate 180 is moved to the image display unit 130. When the film is peeled off, the resin layer 720 reliably remains on the phase difference plate 180 side, and the phase difference plate 180 can be easily peeled off from the image display unit 130.

  After the positioning, the image display unit 130 and the phase difference plate 180 are vacuum-pressurized and laminated. In this vacuum pressure lamination, the image display unit 130 and the phase difference plate 180 are placed in a vacuum furnace having an atmosphere temperature of 80 ° C. and a pressure of 150 Pa. Further, a pressure of 0.1 MPa is applied from one side of the image display unit 130 and the phase difference plate 180 with a balloon-like member, and this state is maintained for 3 minutes. Thereby, the image display unit 130 and the phase difference plate 180 are pressure-bonded, and bubbles in the resin layer 720 can be removed.

  Furthermore, it has a heating process after the said lamination process. In this heating step, the image display unit 130 and the phase difference plate 180 are heated in an atmosphere having a pressure higher than atmospheric pressure. The pressure of the atmosphere in the heating step in the heating step is preferably higher than the laminating pressure in the laminating step. As an example of conditions for the heating step, the image display unit 130 and the phase difference plate 180 are arranged for 1 hour in a chamber having an atmospheric temperature of 60 ° C. and a pressure of 0.6 MPa. By the heating process, distortion generated in the image display unit 130 and the phase difference plate 180 by the vacuum pressure lamination is released. Further, the heating step can crush or extrude bubbles of the resin layer 720 that cannot be completely removed by the vacuum pressure lamination. After the heating step, the image display unit 130 and the phase difference plate 180 are bonded by irradiating with ultraviolet rays, as in the bonding step of FIG.

  As mentioned above, according to embodiment shown in FIGS. 12-15, in addition to the effect of embodiment shown in FIGS. 1-11, it has the following effect. According to the present embodiment, since the adhesive sheet 700 is used for bonding the image display unit 130 and the retardation plate 180, the phase difference plate 180 to the retardation plate are required before the resin layer 720 of the adhesive sheet 700 is cured. 180 and easy to peel off. Therefore, the image display unit 130 and the phase difference plate 180 can be easily positioned. In this case, since the resin layer 720 is laminated on the phase difference plate 180 side by the heated roller 800, the resin layer 720 is more reliably attached to the phase difference plate 180 side when the phase difference plate 180 is peeled off from the image display unit 130. It will remain and will be easy to peel off. In addition, since the resin layer 720 is laminated first on the phase difference plate 180 side, the resin layer 720 is surely buried along the unevenness of the light shielding portion 190, and the phase difference plate 180 and the image display portion 130 are filled. The resin layer 720 is arranged more reliably between the two.

  In addition, since a pressurizing step is provided between the laminating step and the adhering step, distortion generated in the image display unit 130 and the phase difference plate 180 by the laminating step is released. Further, the heating step can crush or extrude the bubbles in the resin layer 720 that cannot be completely removed in the laminating step.

  In the embodiment shown in FIGS. 12 to 15, the adhesive sheet 700 is first bonded to the phase difference plate 180 and laminated. Instead, the adhesive sheet 700 may be bonded to the image display unit 130 and laminated.

  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.

It is a disassembled perspective view of the three-dimensional image display apparatus 100 manufactured by the manufacturing method of this embodiment. FIG. 6 is a schematic diagram illustrating a usage state of the stereoscopic image display apparatus 100. 2 is a schematic cross-sectional view of a stereoscopic image display device 100 accommodated in a housing 110. FIG. The schematic sectional drawing of the image generation part 160 before an application | coating process is shown. It is sectional drawing explaining an application | coating process. It is sectional drawing explaining a mounting process. It is sectional drawing explaining a lamination process. It is sectional drawing explaining an adhesion process. An example of the antireflection layer 200 is shown. It is a disassembled perspective view of the other three-dimensional image display apparatus 101 manufactured by the manufacturing method of this embodiment. It is a side view of the phase difference plate 180 and the image display part 130 explaining a viewing angle. It is sectional drawing explaining the sticking process in the other manufacturing method of this embodiment. FIG. 13 is a cross-sectional view for explaining a pasting process subsequent to FIG. 12. FIG. 14 is a cross-sectional view for explaining the pasting process subsequent to FIG. 13. FIG. 6 is a cross-sectional view illustrating a process of placing the phase difference plate 180 on the image display unit 130.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Stereoscopic image display apparatus 101 Stereoscopic image display apparatus 110 Case 120 Light source 130 Image display part 142 Light source side glass substrate 144 Output side glass substrate 150 Light source side polarizing plate 160 Image generation part 162 Right eye image generation area 164 Left eye image generation area 165 Outside Frame 170 Output-side polarizing plate 180 Phase difference plate 181 Right eye polarization region 182 Left eye polarization region 183 Glass substrate 185 Phase difference plate 186 Right eye polarization region 187 Left eye polarization region 190 Light shielding portion 200 Antireflection layer 202 Adhesive layer 204 Base material 206 Hard Coat 208 High Refractive Index Resin 210 Low Refractive Index Resin 220 Polarized Glasses 232 Right Eye Image Transmitting Portion 234 Left Eye Image Transmitting Portion 300 Adhesive Layer 500 Viewer 512 Right Eye 514 Left Eye 530 Viewer 540 Viewer 600 Roller 610 Mounting Base 700 Adhesive sheet 710 Separate Film 720 Resin layer 800 Roller

Claims (14)

An image generation unit including a right eye image generation region for generating right eye image light and a left eye image generation region for generating left eye image light; and the polarization axes of the right eye image light and the left eye image light are parallel to each other An image display unit that emits light as linearly polarized light,
Arranged on the exit side of the image display unit, the right-eye polarization region, the left-eye polarization region, and the boundary between the right-eye polarization region and the left-eye polarization region, which is disposed on the incident-side surface and is incident A light-shielding portion that blocks the right-eye image light and the left-eye image light, and is incident when the right-eye image light and the left-eye image light are incident on the right-eye polarization region and the left-eye polarization region, respectively. A three-dimensional image display that outputs the right-eye image light and the left-eye image light as linearly-polarized light whose polarization axes are orthogonal to each other or circularly-polarized light whose rotation directions of the polarization axes are opposite to each other. A device manufacturing method comprising:
At least one of the emission side surface of the image display unit and the incident side surface of the retardation plate, and the right eye image generation region and the left eye image generation region of the image display unit and the retardation plate An application step of applying a resin to a region where the polarizing region for the right eye and the polarizing region for the left eye overlap;
After the coating step, a placement step of placing the exit side surface of the image display unit and the entrance side surface of the retardation plate facing each other ;
A degassing step of degassing the resin in a vacuum furnace after the placing step;
During or after the deaeration step, a laminating step for laminating the image display unit and the retardation plate, and
A manufacturing method comprising a bonding step of bonding the image display unit and the retardation plate by curing a resin between the image display unit and the retardation plate laminated in the laminating step. The manufacturing method according to claim 1, wherein the degassing step includes a step of degassing the image display unit coated with the resin with ultrasonic waves. The manufacturing method of Claim 1 or 2 which deaerates the said resin by performing the said application | coating process in the vacuum furnace which pressure-reduced. The application step includes a step of applying the resin including an ultraviolet curable resin,
The manufacturing method according to claim 1 , wherein the adhesion step includes a step of irradiating the resin with ultraviolet rays. The application step includes a step of applying the resin including a thermosetting resin,
The said adhesion process is a manufacturing method of Claim 4 including the process of heating the said resin. The application step includes a step of applying a resin that is cured by ultraviolet rays and heat,
The bonding process is, from the side of the retardation plate after curing the resin between the light blocking part by irradiating ultraviolet rays to the resin, according to claim 1 to cure the whole of the resin by heating the resin 4. The production method according to any one of items 1 to 3 . The application step includes a step of applying a resin that is cured by ultraviolet rays and heat,
The manufacturing method according to any one of claims 1 to 3, wherein, in the bonding step, the resin is entirely cured by heating the resin while irradiating the resin with ultraviolet rays from the phase difference plate side. An image generation unit including a right eye image generation region for generating right eye image light and a left eye image generation region for generating left eye image light; and the polarization axes of the right eye image light and the left eye image light are parallel to each other An image display unit that emits light as linearly polarized light,
Arranged on the exit side of the image display unit, disposed on the incident-side surface at the boundary between the right-eye polarization region, the left-eye polarization region, and the right-eye polarization region and the left-eye polarization region. A light-shielding portion that blocks the right-eye image light and the left-eye image light, and is incident when the right-eye image light and the left-eye image light are incident on the right-eye polarization region and the left-eye polarization region, respectively. A three-dimensional image display that outputs the right-eye image light and the left-eye image light as linearly polarized light having polarization axes orthogonal to each other or circularly polarized light having rotation directions of the polarization axes opposite to each other. A device manufacturing method comprising:
At least one of the emission side surface of the image display unit and the incident side surface of the retardation plate, and the right eye image generation region and the left eye image generation region of the image display unit and the retardation plate A sticking step of attaching an adhesive sheet containing a curable resin to a region where the polarizing region for the right eye and the polarizing region for the left eye overlap,
After the attaching step, a placing step of placing the exit side surface of the image display unit and the entrance side surface of the retardation plate facing each other ;
A degassing step of degassing the resin in a vacuum furnace after the placing step;
During or after the deaeration step, a laminating step for laminating the image display unit and the retardation plate, and
A manufacturing method comprising a bonding step of bonding the image display unit and the retardation plate by curing a resin between the image display unit and the retardation plate laminated in the laminating step. The sticking step includes
Bonding the resin layer side of the adhesive sheet having a resin layer and a separate film supporting the resin layer to the incident-side surface of the retardation plate;
Laminating the adhesive sheet on the retardation plate by pressing a heated roll on the separate film side of the adhesive sheet attached to the incident side surface of the retardation plate;
The method according to claim 8, further comprising a step of peeling the separated film of the laminated adhesive sheet from the resin layer. The manufacturing method according to claim 9, further comprising a heating step of heating the image display unit and the retardation plate in an atmosphere having a pressure higher than atmospheric pressure between the laminating step and the bonding step. The manufacturing method according to claim 10 , wherein the pressure of the atmosphere in the heating step is higher than the laminating pressure in the laminating step. A stereoscopic image display device manufactured by the manufacturing method according to claim 1 . The image display unit includes a pair of glass substrates and a liquid crystal sealed between the pair of glass substrates,
The stereoscopic image display device according to claim 12, wherein the exit side glass substrate has a thickness of 0.5 mm or less. The image display unit includes a pair of glass substrates and a liquid crystal sealed between the pair of glass substrates,
The retardation plate has a glass substrate that supports the polarizing region for the right eye and the polarizing region for the left eye,
The stereoscopic image display device according to claim 12 , wherein a thickness of the glass substrate of the retardation plate is thicker than a thickness of the glass substrate on the emission side in the image display unit.

Images