JP2014134586A - Stereoscopic video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stereoscopic image display device of a deflection spectacle system in which an angle of field and luminance are improved.SOLUTION: A stereoscopic video display device according to the invention comprises, in the following order: a back light; a condensing member; a rear side polarizer; a liquid crystal cell in which a right-eye video area and a left-eye video area are alternately arranged in a first direction; and a pattern polarization film in which a right-eye polarization area and a left-eye polarization area are alternately arranged along the first direction. The liquid crystal cell includes a color filter in which a color aperture part formed from a plurality of color areas and a pattern boundary light shield part are alternately arranged in the first direction. Each of the pattern boundary light shield parts of the color filter is arranged along the boundary between the right-eye video area and left-eye video area of the liquid crystal cell. The color filter is configured such that the width of the pattern boundary light shield part in the first direction is increased relatively, and the condensing member images light from the back light onto the color aperture part of the color filter.

Description

  The present invention relates to a polarized glasses type stereoscopic image display apparatus.

  In recent years, interest in high-resolution 3D images has increased, and various 3D image display devices have been put into practical use. Three-dimensional display methods are broadly classified into spectacle methods that allow a viewer to wear special stereoscopic glasses, and naked-eye methods that do not require stereoscopic glasses. The glasses method is widely used mainly for large displays because of its wide stereoscopic view range. In the polarized glasses method classified as one of the glasses methods, a stereoscopic image display device in which a right-eye image region and a left-eye image region are alternately formed in a stripe shape is used.

  Polarized glasses-type stereoscopic image display devices have a wide stereoscopic view range, and stereoscopic glasses are less expensive than shutter glasses. It attracts attention as a display method. However, there is a problem with polarized glasses type stereoscopic image display devices that the viewing angle in the vertical direction of the screen (vertical viewing angle) is small. The vertical viewing angle is closely related to a “crosstalk phenomenon” in which a stereoscopic image becomes unclear when the right-eye video and the left-eye video are viewed together.

  As schematically shown in FIG. 5A, the video display cell 140 constituting the polarizing glasses type stereoscopic video display device has a right-eye video area 141 and a left-eye video area 142 in a first direction (vertical direction in the drawing). ) Are alternately arranged, and each video display area extends in a second direction (paper surface normal direction) orthogonal to the first direction. Generally, the vertical direction (vertical direction) of the screen is the first direction, and the horizontal direction (horizontal direction) of the screen is the second direction. That is, right-eye video areas and left-eye video areas are alternately arranged along the vertical direction of the screen, and each video area extends in the horizontal direction of the screen.

  On the viewing side of the image display cell 140, the right-eye polarizing regions 151 and the left-eye polarizing regions 152 are alternately arranged along the first direction, and a pattern polarizing film 150 is provided in which each region extends in the second direction. Is done. The right-eye polarizing region 151 and the left-eye polarizing region 152 of the pattern polarizing film 150 are configured to emit polarized light orthogonal to each other. Here, “orthogonal polarized light” refers to, for example, a combination of linearly polarized light whose transmission axis directions are orthogonal or a combination of right circularly polarized light and left circularly polarized light.

The pattern polarizing film 150 is disposed such that the right-eye polarizing region 151 corresponds to the right-eye video region 141 of the video display cell 140 and the left-eye polarizing region 152 corresponds to the left-eye video region 142 of the video display cell 140. . Therefore, the video light emitted from the right-eye video region 141 passes through the right-eye polarization region 151 (r ₁₁₀ ), and the video light emitted from the left-eye video region 142 passes through the left-eye polarization region 152 (r _120). ). A viewer wears polarized glasses including a right-eye viewing unit and a left-eye viewing unit that absorb polarized light that are orthogonal to each other, and visually recognizes the image light. The right eye viewing unit of the polarized glasses transmits the polarized light emitted from the right eye polarized region 151 and absorbs the polarized light emitted from the left eye polarized region 152. On the other hand, the left eye viewing unit of the polarized glasses transmits the polarized light emitted from the left eye polarized region 152 and absorbs the polarized light emitted from the right eye polarized region 151. Therefore, only the right-eye video light and the left-eye video light are visually recognized by each of the right eye and the left eye of the viewer wearing the polarized glasses, thereby enabling stereoscopic viewing.

However, it is difficult for the right-eye video light and the left-eye video light emitted from the video display cell 140 to pass through the right-eye polarization region 151 and the left-eye polarization region 152 strictly and reach the viewer. . First, in order to obtain a clear stereoscopic image, it is necessary to reduce the pixel size and to make the arrangement pitch of the right-eye image region 141 and the left-eye image region 142 dense (high definition). However, since the pattern width decreases as the pixel size decreases, the pattern polarizing film 150 may be accurately aligned along the first direction so as to correspond to the pattern of the video display cell 140. It becomes difficult. In addition, since the light emitted from the video display cell includes other than parallel light, a part of the light emitted from the right-eye video region 141 passes through the left-eye video region 152 and reaches the viewer. (R ₁₁₁ , r ₁₁₂ ), part of the light emitted from the left-eye video region 142 passes through the right-eye video region 151 and reaches the viewer (r ₁₂₁ , r ₁₂₂ ).

  As described above, the image light from the right-eye image area 141 is transmitted through the left-eye polarization area 152 and the image light from the left-eye image area 142 due to the positional deviation of the pattern polarizing film and the obliquely emitted light. May pass through the polarizing region 151 for the right eye. The crosstalk phenomenon is a phenomenon in which a right-eye image and a left-eye image are viewed together in each eye due to such light (crosstalk light), and a stereoscopic image becomes unclear. When the stereoscopic image display device is viewed from the front, crosstalk hardly occurs, but the crosstalk tends to become more prominent as the viewing angle in the vertical direction (first direction) of the screen increases. For this reason, the stereoscopic glasses display apparatus using polarized glasses tends to cause crosstalk when the viewing angle is moved in the vertical direction of the screen, which contributes to narrowing the vertical viewing angle.

In order to solve the problem of a narrow viewing angle caused by crosstalk, an attempt has been made to reduce crosstalk light by providing a light shielding portion in a stereoscopic image display device. For example, Patent Document 1 discloses a method of providing a light shielding portion 153 at the boundary between the right-eye polarizing region 151 and the left-eye polarizing region 152 of the pattern polarizing film 150 as schematically shown in FIG. Yes. By providing the light shielding part on the pattern polarizing film, since the obliquely emitted light (r ₁₁₁ , r ₁₁₂ , r ₁₂₁ , r ₁₂₂ ) that causes crosstalk is absorbed by the light shielding part 153, crosstalk is reduced. Is done.

JP 2002-185983 A

  As proposed in Patent Document 1, the method of providing a light blocking portion on a pattern polarizing film is effective in reducing crosstalk. However, since the light emitted from the video display cell in the oblique direction is absorbed by the light shielding portion, the light use efficiency is lowered. In particular, since light in an oblique direction does not reach the viewer, the luminance in a region where the viewing angle in the first direction (the vertical direction on the paper surface in FIG. 4B) is large is low. Therefore, the method of providing the light shielding part on the pattern polarizing film has a problem that the vertical viewing angle becomes small as the luminance decreases in the oblique direction.

  In order to reduce crosstalk, the width of the light-shielding portion 153 may be increased. However, as the width of the light-shielding portion is increased, the problem of narrowing the viewing angle due to a decrease in luminance becomes more prominent. That is, in the conventional technique, there is a trade-off relationship between reduction in crosstalk and improvement in luminance, so it is difficult to achieve a wide viewing angle from the viewpoint of both reduction in crosstalk and increase in luminance.

  Further, in order to provide the light shielding part on the pattern polarizing film, it is necessary to provide a separate process for forming the light shielding part. Therefore, the manufacturing process of the pattern polarizing film is complicated, and the productivity tends to decrease and the cost increases. . Furthermore, since the arrangement pitch of the light shielding portions provided in the pattern polarizing film approximates the arrangement pitch of the light shielding portions (black matrix) of the color filters provided in the video display cell, moire is likely to occur. Cause problems.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a polarizing glasses type stereoscopic image display device with an enlarged viewing angle in terms of both crosstalk reduction and luminance enhancement.

  The stereoscopic image display device according to the present invention includes a backlight; a light collecting member; a rear-side polarizing plate; a liquid crystal cell in which right-eye video regions and left-eye video regions are alternately arranged along a first direction; and right-eye polarization. The pattern polarizing film in which the area | region and the polarizing area for left eyes are alternately arrange | positioned along a 1st direction is provided in this order.

  The right-eye video region and the left-eye video region of the liquid crystal cell, and the right-eye polarization region and the left-eye polarization region of the pattern polarizing film all extend in the second direction orthogonal to the first direction. The pattern polarizing film is arranged so that the right-eye polarizing region and the left-eye polarizing region correspond to the right-eye video region and the left-eye video region of the liquid crystal cell, and the right-eye polarizing region and the left-eye polarizing region are The optical characteristic is that the light emitted from the liquid crystal cell is converted into polarized light orthogonal to each other.

  A color filter is provided in the liquid crystal cell. In the color filter, color openings made up of a plurality of color regions and pattern boundary light shielding portions are alternately arranged along the first direction. Each pattern boundary light-shielding portion of the color filter is disposed along the boundary between the right-eye video region and the left-eye video region of the liquid crystal cell.

  In the present invention, the width of the color filter in the first direction of the pattern boundary light shielding portion is relatively increased. And the condensing member arrange | positioned between a backlight and a liquid crystal cell is comprised so that the light from a backlight may be focused on the color opening part of a color filter.

  In a preferred embodiment of the present invention, the patterned polarizing film does not have a light shielding part on the boundary between the right-eye polarizing region and the left-eye polarizing region. According to the said structure, generation | occurrence | production of a moire is suppressed.

  In one embodiment of the present invention, the patterned polarizing film includes a linear polarizer and a patterned retardation film from the liquid crystal cell side. The pattern retardation film has a right-eye retardation region corresponding to the right-eye polarization region and a left-eye retardation region corresponding to the left-eye polarization region. The right-eye retardation region and the left-eye retardation region have optical characteristics that convert linearly polarized light emitted from the liquid crystal cell via the linear polarizer into polarized light orthogonal to each other. In a preferred embodiment, the retardation region for the right eye and the retardation region for the left eye of the pattern retardation film are orthogonal to each other in the slow axis direction, and both have retardation of ¼ wavelength. According to this configuration, the image light from the right eye image area and the image light from the left eye image area of the liquid crystal cell are visually recognized from the pattern polarizing film as circularly polarized light (right circularly polarized light and left circularly polarized light) orthogonal to each other. It is injected into the person side. As described above, when the image light from the stereoscopic image display device is emitted as circularly polarized light, a circularly polarizing plate is used for the stereoscopic polarizing glasses. According to such a configuration, the right-eye video light and the left-eye video light can be separated even if the polarization axis direction of the stereoscopic video display device and the polarization axis direction of the stereoscopic polarizing glasses do not match. Even when the face angle of the viewer changes or the wearing state of the polarized glasses changes, mixing of the right-eye video light and the left-eye video light is suppressed.

  In a preferred embodiment of the present invention, the backlight is a condensing backlight in which the amount of light in the normal direction of the liquid crystal cell surface is relatively increased compared to the amount of light in the oblique direction. According to this configuration, since the light from the backlight is efficiently focused on the color opening of the color filter by the light collecting member, the effects of reducing crosstalk and improving luminance are enhanced.

  In one embodiment of the present invention, the light collecting member is a lenticular lens in which a plurality of cylindrical lenses extending in the second direction are arranged along the first direction. If the cylindrical lens is arranged so as to correspond to the pattern of the right-eye video area and the left-eye video area of the liquid crystal cell, the light from the backlight is efficiently condensed on the color opening of each video display area. be able to.

  In the stereoscopic image display device of the present invention, the width of the pattern boundary light-shielding portion of the color filter is large, so that the video light emitted from the right-eye video region of the liquid crystal cell enters the left-eye polarization region or exits from the left-eye video region. The incident image light is prevented from entering the right-eye polarization region. Therefore, the crosstalk of the stereoscopic video is reduced and the viewing angle in the first direction is expanded. In addition, since the light from the backlight is condensed by the light collecting member to the color opening of the color filter, the light absorption inside the image display device is achieved even though the width of the pattern boundary light shielding portion is increased. The amount is small, and the light extraction efficiency to the viewer side is increased. Therefore, the luminance of the video display device can be increased and the power consumption can be reduced. Further, since the width of the pattern boundary light shielding portion of the color filter is large and the area of the opening is small, the amount of incident external light into the liquid crystal cell is reduced, and the bright contrast of the video display device is improved.

  Furthermore, according to the configuration of the present invention, by increasing the width of the pattern boundary light shielding portion of the color filter, the path when the light from the backlight enters the pattern polarizing film on the viewing side is limited to a specific range. Is done. Therefore, the allowable range of the pattern pitch accuracy of the pattern polarizing film and the bonding position accuracy with the liquid crystal cell is increased, which can contribute to improvement of productivity and yield.

It is sectional drawing which represents typically the structure of the three-dimensional video display apparatus concerning one Embodiment. It is a top view which represents typically the structural example of the color filter used for a three-dimensional video display apparatus. It is a conceptual diagram for demonstrating the viewing angle expansion in a three-dimensional video display apparatus. It is a conceptual diagram for demonstrating the viewing angle expansion in a three-dimensional video display apparatus. It is a conceptual diagram for demonstrating the crosstalk of a three-dimensional video display apparatus.

  Hereinafter, an embodiment of a stereoscopic image display apparatus of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view schematically showing a configuration of a stereoscopic video display apparatus according to an embodiment of the present invention. The stereoscopic image display device includes a backlight 10, a light condensing member 20, a back side polarizing plate 30, a liquid crystal cell 40, and a pattern polarizing film 50 in this order. A viewer wearing stereoscopic polarizing glasses views the screen from the right side (z-axis direction) of FIG.

[Liquid Crystal Cell]
The liquid crystal cell 40 is configured to modulate light based on a video signal input from the outside, and has a liquid crystal layer 48 between a pair of substrates 44 and 47. In a general configuration, one substrate 47 (active matrix substrate) is provided with a signal line for inputting a video signal from the outside, a switching element for controlling the electro-optical characteristics of the liquid crystal layer based on the input signal, and the like. It has been. A color filter 46 is provided on the other substrate 44 (color filter substrate). 1 shows an example in which the active matrix substrate 47 is provided on the backlight 10 side and the color filter substrate 44 is provided on the viewer side. However, the color filter is provided on the substrate 47 on the backlight side. Also good. The color filter is generally disposed on the surface of the substrate facing the liquid crystal layer 48, but may be provided on the surface of the substrate opposite to the liquid crystal layer 48. The driving method of the liquid crystal cell 40 is not particularly limited, and any driving method such as TN, IPS, VA, OCB can be adopted.

  The liquid crystal cell 40 includes a plurality of picture elements. Each picture element has a plurality of pixels, and each pixel corresponds to a different color display. The color filter 46 has a color area corresponding to each pixel. Color display is performed by arranging each color region of the color filter 46 so as to correspond to each pixel of the liquid crystal cell. FIG. 2 shows a configuration example of a color filter having a color area corresponding to three pixels 4R, 4G, and 4B in each picture element 4, and each pixel has red (R), green ( G) and blue (B). Note that the color configuration is not limited to the three colors RGB, and may be, for example, a three-color configuration of cyan (C), magenta (M), and yellow (Y), or a color configuration of four or more colors.

  The liquid crystal cell 40 includes a right-eye video region 41 configured by a plurality of picture elements in a row, and a left-eye video region 42 configured by a plurality of picture elements different from the right-eye video region. The right-eye video area 41 and the left-eye video area 42 are alternately arranged along the first direction (x-axis direction in FIG. 1). Further, each of the video regions 41 and 42 extends in a second direction (y-axis direction in FIG. 1) orthogonal to the first direction. In the usage state of the stereoscopic video display device, the right-eye video region 41 and the left-eye video region 42 of the liquid crystal cell 40 are respectively provided with the right-eye video signal and the left-eye video signal based on the right-eye video signal and the left-eye video signal input from the outside. A left-eye video is generated.

  FIG. 2 is a plan view schematically illustrating a configuration example of the color filter 46. The color filter 46 has color openings 461 and 462 composed of a plurality of color regions 4R, 4G, and 4B and pattern boundary light shielding portions 463 alternately along a first direction (x-axis direction in the drawing). Each of the color opening portions 461 and 462 and the pattern boundary light shielding portion 463 extend in the second direction (y-axis direction in the drawing).

  In order to reduce the mixed color of red, green, and blue, a color boundary light shielding portion called a black matrix is provided at the boundary portion of each color region so as to extend in the first direction (x-axis direction). . A pattern boundary light shielding portion 463 is also provided between the right-eye color opening 461 corresponding to the right-eye video region 41 of the liquid crystal cell and the left-eye color opening 462 corresponding to the left-eye video region 42 of the liquid crystal cell. A black matrix extending in the second direction (y-axis direction) is provided.

  In a color filter used in a general liquid crystal display device, the widths of the black matrix in the first direction and the black matrix in the second direction are approximately the same. On the other hand, in the color filter 46 used in the stereoscopic video display device of the present invention, the width of the pattern boundary light shielding portion 463 extending in the second direction is increased. By increasing the width of the pattern boundary light-shielding portion, the crosstalk of the stereoscopic video is reduced. The principle of reducing crosstalk will be described in detail later. In addition, since the pattern boundary light shielding portion 463 is large and the aperture ratio of the color filter 46 is small, the amount of incident external light into the liquid crystal cell is reduced, and the bright place contrast of the video display device is improved.

  In the color filter 46, the ratio of the width of the pattern boundary light shielding portion 463 in the first direction is preferably 10% or more, more preferably 25% or more, further preferably 40% or more, and particularly preferably 50% or more. As the proportion of the pattern boundary light-shielding portion increases, the effect of reducing crosstalk and improving bright spot contrast is enhanced. On the other hand, if the ratio of the pattern boundary portion is excessively large, the viewing angle and the luminance may be reduced. The optimum value of the size of the pattern boundary light shielding portion 463 varies depending on the straightness and parallelism of light from the backlight 10 and the light condensing characteristic of the light collecting member 20, but the pattern boundary light shielding portion 463 in the first direction. 90% or less is preferable, 80% or less is more preferable, and 75% or less is more preferable. In addition, when the luminance half-width of the backlight is small and the light collecting accuracy of the light collecting member is high, the viewing angle and the luminance are increased even if the ratio of the width of the pattern boundary light shielding portion 463 in the first direction is 90% or more. A three-dimensional stereoscopic image display device having excellent characteristics can be formed. The width of each pattern boundary light-shielding portion 463 is preferably at least twice the width of the color boundary light-shielding portion (black matrix at the R, G, B pixel boundaries) extending in the first direction, more preferably at least five times. Is more preferably doubled or more, particularly preferably 15 times or more, and most preferably 20 times or more.

  The light shielding part of the color filter 46 can be formed by the same method as the light shielding part (black matrix) in a general color filter. The light shielding part is made of, for example, a metal or a resin material. As the resin material, for example, a material in which a pigment is dispersed in an acrylic resin is used. As described above, the color filter used in the stereoscopic image display apparatus of the present invention can be manufactured by the same process and material as the conventional color filter except that the width of the pattern boundary light-shielding portion is increased. Productivity is excellent because there is no need to add a process.

  In FIG. 2, the red region 4R, the green region 4G, and the blue region 4B are arranged along the second direction (y-axis direction), but the pixel arrangement in each picture element is limited to this form. Not. For example, the pixels may be arranged in the first direction (x-axis direction), or may be arranged in a honeycomb shape or a square shape.

[Pattern Polarized Film]
The pattern polarizing film 50 has a right-eye polarizing region 51 and a left-eye polarizing region 52. The right-eye polarizing region 51 and the left-eye polarizing region 52 are disposed so as to correspond to the right-eye video region 41 and the left-eye video region 42 of the liquid crystal cell 40, respectively. That is, the right-eye polarizing regions 51 and the left-eye polarizing regions 52 are alternately arranged along the first direction, and the polarizing regions 51 and 52 extend in the second direction. The right-eye polarizing region and the left-eye polarizing region have optical characteristics that convert the light emitted from the liquid crystal cell into polarized light orthogonal to each other.

  In one embodiment, the pattern polarizing film 50 emits the right-eye image light and the left-eye image light emitted from the liquid crystal cell 40 as linearly polarized light whose polarization axes are orthogonal to each other. For example, when the right-eye polarizing region 51 has an optical characteristic of transmitting light having a vibration direction in the first direction and absorbing light having the vibration direction in the second direction, the left-eye polarizing region 52 has the first direction. Has an optical characteristic of absorbing light having a vibration direction and transmitting light having a vibration direction in the second direction. In this case, the light emitted from the right-eye video region 41 of the liquid crystal cell 40 enters the right-eye polarizing region 51 of the pattern polarizing film 50 and exits to the viewer side as linearly polarized light having a vibration direction in the first direction. Is done. On the other hand, the light emitted from the left-eye image area 42 of the liquid crystal cell 40 enters the left-eye polarization area 52 of the pattern polarizing film 50 and is emitted to the viewer side as linearly polarized light having a vibration direction in the second direction. The

  In another embodiment, the pattern polarizing film 50 emits the right-eye image light and the left-eye image light emitted from the liquid crystal cell 40 as circularly polarized light having opposite polarities. For example, when the right-eye polarizing region 51 has an optical characteristic that converts light from the liquid crystal cell 40 into right circularly polarized light, the left-eye polarizing region 52 has an optical characteristic that converts light from the liquid crystal cell 40 into left circularly polarized light. Have In this way, when the right-eye polarizing region 51 and the left-eye polarizing region 52 emit circularly polarized light having opposite polarities, the pattern polarizing film 50 is straight from the liquid crystal cell 40 side as shown in FIG. It is preferable to include a polarizer 54 and a pattern retardation film 58. The pattern retardation film 58 has a right-eye retardation region 581 corresponding to the right-eye polarization region 51 and a left-eye retardation region 582 corresponding to the left-eye polarization region 52.

  In the present embodiment, when the right-eye video light and the left-eye video light emitted from the liquid crystal cell 40 enter the linear polarizer 54, the light in the absorption axis direction of the linear polarizer 54 is absorbed and vibrates in the transmission axis direction. The light is emitted to the pattern retardation film 58 side as linearly polarized light having a direction. As the pattern retardation film 58, for example, the right-eye retardation region 581 and the left-eye retardation region 582 are configured such that the slow axis directions are orthogonal to each other and both have retardation of ¼ wavelength. Is used. If the angle formed between the slow axis direction of the right-eye retardation region 581 and the slow-axis direction of the left-eye retardation region 582 of the pattern retardation film 58 and the transmission axis direction of the linear polarizer 54 is ± 45 °. The linearly polarized light incident from the linear polarizer 54 side is converted into circularly polarized light having different polarities in the right-eye phase difference region 581 and the left-eye phase difference region 582, and is emitted to the viewer side.

  The phase retardation film for the right eye and the phase difference area for the left eye are orthogonal to each other in the slow axis direction, and both have a retardation of ¼ wavelength. The active compound can be produced by fixing the orientation so that the orientation directions are orthogonal to each other for each minute region (the phase difference region for the right eye and the phase difference region for the left eye). In addition, a phase difference plate patterned in a first region having a half-wavelength (λ / 2) retardation and a second region having no retardation, and an optical rotation for rotating the polarization vibration plane by 90 ° An optical rotatory element composed of a first region where an element is arranged and a second region where the optical rotatory element is not formed is arranged between a linear polarizer and a quarter wavelength plate, or on the viewing side of the quarter wavelength plate. The pattern polarizing film which inject | emits the circularly polarized light from which polarity mutually differs can be comprised by methods, such as arrange | positioning.

  The quarter-wave retardation does not have to be exactly ¼ of the wavelength, and may be in a range in which linearly polarized light is converted into substantially circularly polarized light. The “substantially circularly polarized light” may include not only perfect circularly polarized light but also elliptically polarized light that is close to perfect circularly polarized light, that is, whose ellipticity is close to 1. For example, the retardation of ¼ wavelength is preferably 137.5 ± 30 nm, more preferably 137.5 ± 20 nm, and more preferably 137.5 ± 10 nm at a wavelength λ = 550 nm. More preferably. Further, the angle 45 ° does not need to be strictly 45 °. For example, an angle of 45 ° ± 5 °, preferably about 45 ° ± 3 ° may be allowed.

  As described above, the configuration of the pattern polarizing film has been described with reference to some embodiments. However, the pattern polarizing film used in the stereoscopic image display device of the present invention is configured so that the light emitted from the liquid crystal cell is converted into the right eye polarizing region and the left eye. If it has the optical characteristic which converts into the mutually orthogonal polarization | polarized-light with the polarizing region for light, it will not be limited to said example, Various things can be used. The patterned polarizing film 50 may be composed of a single layer of patterned polarizer, may be a two-layered laminate of a polarizer and a patterned retardation film, or may be a laminate of three or more layers. . In addition, a transparent protective layer, a hard coat layer, and an easy adhesion are provided on the surface of the polarizer 54 on the liquid crystal cell 40 side, between the polarizer 54 and the pattern retardation film 58, and on the viewing side surface of the pattern retardation film. A layer or the like may be provided.

[Back-side polarizing plate]
A back side polarizing plate 30 is disposed on the back side of the liquid crystal cell 40 as viewed from the viewer side. When the light emitted from the backlight 10 is incident through the light collecting member 20, the back-side polarizing plate 30 transmits light having a vibration direction in the transmission axis direction and light having the vibration direction in the absorption axis direction. Cut off. In general, light having a vibration direction in the absorption axis direction is absorbed and blocked by the back side polarizing plate 30, but may be reflected to the backlight 10 side.

  The arrangement direction of the back side polarizing plate 30 is appropriately set according to the driving method of the liquid crystal cell 40 and the configuration of the pattern polarizing film 50. Generally, the pattern polarizing film 50 is often arranged so that the absorption axis direction of the pattern polarizing film 50 and the absorption axis direction of the back-side polarizing plate 30 are orthogonal to each other, but both are arranged in parallel or at a predetermined angle. There is also.

[Backlight]
The backlight 10 is disposed on the farthest side of the stereoscopic video display device as viewed from the viewer. The backlight emits light toward the liquid crystal cell 40 side. In FIG. 1, a surface light source is illustrated as the backlight 10, but a sidelight type backlight, a backlight using a combination of a point light source and a condenser lens such as a Fresnel lens sheet, or the like can also be used. .

The backlight 10 used in the stereoscopic image display apparatus of the present invention is preferably a condensing backlight in which the amount of light in the normal direction of the liquid crystal cell surface is relatively increased compared to the amount of light in the oblique direction. In a commercially available liquid crystal television or the like, a diffusion backlight having a luminance half-value angle of about 80 to 100 ° is widely used. On the other hand, in the present invention, a condensing backlight having an increased amount of light in the normal direction is used, so that the light from the backlight is efficiently opened by the condensing member 20 in the color aperture of the color filter 46. The portions 461 and 462 can be focused, and the effects of reducing crosstalk and improving luminance can be enhanced. The condensing backlight preferably has a luminance half-value angle of less than 80 °, more preferably 50 ° or less, and even more preferably 20 ° or less. Note that the luminance half-value angle of the backlight is a pole that shows a luminance distribution with respect to the polar angle in the first direction (x-axis direction in FIG. 1) and shows half the luminance in the normal direction (polar angle 0 °). The angle width θ between the angles θ ₁ and θ ₂ .

  A condensing backlight is better as the luminance half width is smaller. However, in order to bring the luminance half-value angle closer to 0 °, means such as shielding light from the light source using a louver or a slit is required. In some cases, the configuration of the backlight is complicated, or the luminance is reduced and the power consumption is increased due to a decrease in the utilization efficiency of light from the light source. Therefore, the half value width of the luminance of the condensing backlight is preferably 1 ° or more, and more preferably 3 ° or more.

  The configuration of the condensing backlight is not particularly limited as long as the luminance half-value angle is small. As an example, a condensing backlight includes a light source, a diffusion plate disposed on the front surface (liquid crystal cell side) of the light source, a corrugated sheet disposed on the front surface of the diffusion plate, and a reflection disposed on the back side of the light source. A board. As the corrugated sheet, for example, those disclosed in JP-A-4-67016 can be used. By adjusting the shape of the corrugated sheet, the half-value angle of the luminance of the backlight can be adjusted. Moreover, it can replace with a corrugated sheet, or can also use another condensing element with a corrugated sheet. As such a condensing element, for example, a condensing plate in which translucent spheres are arranged on a support, as disclosed in JP 2000-275411 A, or disclosed in JP 2001-188230 A. A microlens array as described above can be used. A condensing backlight having a spot-like slit on the front surface of the light source as disclosed in JP-A-5-341270 can also be used. Further, in addition to these, a condensing element using a combination of a reflective polarizer and a retardation plate as disclosed in Japanese Patent Application Laid-Open No. 2003-315546 may be employed. In addition, the luminance half-value width of the backlight can also be reduced by using a light source having high straightness such as a light emitting diode as the light source of the backlight.

[Condensing member]
A condensing member 20 is disposed between the backlight 10 and the back-side polarizing plate 30 for the purpose of controlling the path of light emitted from the backlight 10. The condensing member 20 is preferably configured so that light emitted from the backlight 10 is focused on the color openings 461 and 462 of the color filter 46. For example, as conceptually shown in FIG. 3, the light collecting member 20 includes a plurality of lenses 21, and each of the lenses 21 a, 21 b, 21 c, 21 d, 21 e, and 21 f receives light from the backlight 10. The light path is controlled so as to be condensed on the corresponding color openings 461a, 462b, 461c, 462d, 461e and 462f.

  Note that the light emitted from the backlight is focused on the color opening is not limited to the case where the focal point of the lens completely coincides with the color opening. The condensing member 20 controls the path of light emitted from the backlight, thereby reducing the amount of light absorbed by the pattern boundary light shielding portion 463 of the color filter 46, and the color of the corresponding right eye region or left eye region. What is necessary is just to be comprised so that the light quantity inject | emitted from the opening parts 461 and 462 to the visual recognition side may be increased.

  The condensing member 20 is, for example, a lens array in which a plurality of lenses 21 are arranged along the first direction, and each lens 21 corresponds to the right-eye video region 41 and the left-eye video region 42 of the liquid crystal cell 40. Are arranged as follows. The condensing member 20 is a lenticular lens in which a plurality of cylindrical lenses 21 extending in the second direction are arranged along the first direction, for example. When the condensing member is a lenticular lens, each cylindrical lens 21 is arranged so as to correspond to the pattern of the right-eye video region 41 and the left-eye video region 42 of the liquid crystal cell 40.

  The condensing member 20 is not limited to a lens array such as a lenticular lens as long as it is configured to transmit light from the backlight through the color opening of each image area. For example, like a diffraction grating, An optical member that can control the path of light can be used without limitation.

[Principle of viewing angle expansion]
Hereinafter, the viewing angle expansion in the stereoscopic image display apparatus of the present invention will be described with reference to FIG.

  The light emitted from the backlight 10 is controlled in its path by the light collecting member 20, and only the light having the vibration direction in the transmission axis direction is transmitted through the back-side polarizing plate (not shown) and enters the liquid crystal cell 40. To do. The light incident on the liquid crystal cell 40 is transmitted through the color opening of the color filter 46, is incident on the pattern polarizing film 50, and is converted into polarization states corresponding to the right-eye polarizing region 51 and the left-eye polarizing region 52, respectively. Then, it reaches the viewer 90 wearing the polarizing glasses 91 for stereoscopic viewing.

  The light emitted from the backlight 10 to the lens 21c will be described as an example. The light emitted from the backlight passes through the lens 21c of the light collecting member 20 and enters the right-eye video region 41 of the liquid crystal cell 40. . The lens 21c is configured such that the color opening 461c provided in the right-eye region is in focus, and most of the light from the backlight 10 is directed to the pattern polarizing film 50 through the color opening 461c. Transparent. Therefore, according to the configuration of the present invention, although the area of the pattern boundary light shielding portion 463 of the color filter is large, the amount of light that reaches and is absorbed by the pattern boundary light shielding portion is small, so that the light utilization efficiency is improved. In addition, high brightness and low power consumption can be achieved.

  Further, since the light path is controlled by the light condensing member 20, the light emitted from the right-eye video region 41 of the liquid crystal cell 40 passes through the right-eye polarizing region 51 of the pattern polarizing film 50 and is polarized for the left eye. It can be controlled so that the light emitted from the right-eye video area 41 does not reach the area 52. Therefore, according to the configuration of the present invention, crosstalk is reduced.

As described above, according to the configuration of the present invention, both the reduction of crosstalk and the improvement of luminance can be achieved, and the wide viewing angle of the stereoscopic video display device can be achieved. Furthermore, according to the structure of this invention, the light of a wide angle range can be utilized rather than the prior art which provides the light-shielding part 153 in the pattern boundary of the pattern polarizing film 150. FIG. That is, since the color filter in the liquid crystal cell 40 is disposed at a position closer to the backlight 10 than the pattern polarizing film 50, the color of the color filter 46 is schematically shown in FIG. The angle range (angle θ _A ) of the light that can be used when the light is collected at the opening is a case where the light shielding portion 153 is provided on the pattern polarizing film 150 as schematically shown in FIG. Is wider than the angle range (angle θ _B ) of light available for

  Furthermore, according to the structure of this invention, since the light path is controlled before the light from the backlight 10 reaches | attains the pattern polarizing film 50, the polarization area | region 51 for right eyes and the left eye of the pattern polarizing film 50 are controlled. Therefore, it is not necessary to provide a light shielding portion on the boundary with the polarizing region 52 for use, and the manufacturing process of the pattern polarizing film can be simplified. Further, as described above, increasing the width of the pattern boundary light-shielding portion of the color filter does not involve any special process. Therefore, according to the structure of this invention, the manufacturing process of the structural member of a three-dimensional video display apparatus can be simplified, and productivity can be improved.

  In addition, when the pattern polarizing film is not provided with a light shielding portion, the occurrence of moire due to the approximation of the pitch between the light shielding portion of the pattern polarizing film and the light shielding portion of the color filter, which has been a problem in the prior art, is suppressed. The

  In the configuration of the present invention, the pattern boundary light shielding portion 463 provided in the color filter 46 reduces the incident amount of external light into the liquid crystal cell and improves the bright place contrast of the video display device. , It is possible to suppress the emission of undesired light to the viewing side and contribute to the reduction of crosstalk and the improvement of contrast. The undesired light is, for example, light that has not been collected on the intended path by the light collecting member 20, or light that has been refracted and irregularly reflected by a TFT array or the like (stray light).

[Formation of stereoscopic display device]
As described above, the stereoscopic image display device of the present invention includes the backlight 10, the light collecting member 20, the back side polarizing plate 30, the liquid crystal cell 40, and the pattern polarizing film 50. As long as the liquid crystal cell 40 has the color filter 46 described above, the manufacturing method thereof is not particularly limited. It is preferable that the back side polarizing plate 30 and the pattern polarizing film 50 are bonded to the liquid crystal cell 40 through appropriate adhesive layers or the like.

  When the pattern polarizing film 50 and the liquid crystal cell are attached, the right-eye polarizing region and the left-eye polarizing region of the pattern polarizing film are arranged so as to correspond to the right-eye video region and the left-eye video region of the liquid crystal cell, respectively. There is a need. Since the width of the right-eye video region and the left-eye video region is several tens of μm to several hundreds of μm, it is generally necessary that the bonding of both be performed with a positional accuracy of about several μm to several tens of μm. On the other hand, in the configuration of the present invention, the width of the pattern boundary light-shielding portion of the color filter is large, and the path of light incident on the pattern polarizing film is limited to a specific range. Sex and yield can be increased.

  The stereoscopic image display apparatus may include an arbitrary member other than the above. For example, a diffusion element can be provided further on the viewing side than the pattern polarizing film 50. Since the stereoscopic image display device of the present invention employs a condensing backlight and a condensing member, the luminance in the oblique direction tends to be lower than that of a general liquid crystal display device. By providing, the light in the front direction can be distributed in the oblique direction, and the luminance in the oblique direction can be increased. In addition, as a diffusion element provided in the visual recognition side of a pattern optical film, what does not change or eliminate the polarization state of the light inject | emitted from the pattern polarizing film 50 to the visual recognition side is used.

  As described above, in the present invention, the crosstalk of the stereoscopic image is reduced by using the condensing member that condenses the light from the backlight and increasing the width of the pattern boundary light shielding portion of the color filter. The Furthermore, since the light absorption in the liquid crystal cell is reduced and the luminance is improved, the viewing angle of the stereoscopic image display device is expanded. Furthermore, according to the structure of this invention, since the tolerance | permissible_range of the pattern pitch precision of a pattern polarizing film and a bonding position precision with a liquid crystal cell increases, it can contribute also to improvement of productivity or a yield.

  The stereoscopic image display device of the present invention can be used without limitation in mobile devices such as mobile phones, smartphones, tablet computers, and portable game machines, OA devices such as personal computer monitors, and large display devices such as televisions and information displays. Can do.

DESCRIPTION OF SYMBOLS 100: Stereoscopic image display apparatus 10: Backlight 20: Condensing member 21: Lens 30: Back side polarizing plate 40: Liquid crystal cell 41, 42: Image area 46: Color filter 461, 462: Color opening part 463: Pattern boundary light shielding Portion 48: Liquid crystal layer 50: Pattern polarizing film 51, 52: Polarizing region 54: Linear polarizer 58: Pattern retardation film 581, 582: Phase difference region 90: Viewer 91: Polarized glasses for stereoscopic viewing

Claims (6)

A stereoscopic image display device,
Backlight; condensing member; back-side polarizing plate; liquid crystal cell in which right-eye video region and left-eye video region are alternately arranged along the first direction; right-eye polarizing region and left-eye polarizing region are first Pattern polarizing films arranged alternately along the direction, the right-eye video region and the left-eye video region of the liquid crystal cell, and the right-eye polarizing region and the left-eye polarizing region of the pattern polarizing film, respectively. Extending in a second direction orthogonal to the first direction,
The pattern polarizing film is disposed such that the right-eye polarizing region and the left-eye polarizing region correspond to the right-eye video region and the left-eye video region of the liquid crystal cell, respectively.
The right-eye polarizing region and the left-eye polarizing region have optical characteristics that convert light emitted from the liquid crystal cell into polarized light orthogonal to each other,
The liquid crystal cell includes a color filter in which a color opening made up of a plurality of color regions and a pattern boundary light shielding portion are alternately arranged along the first direction, and each pattern boundary light shielding portion has a right eye of the liquid crystal cell. Is located along the boundary between the video area for video and the video area for the left eye,
The color filter has a relatively increased width in the first direction of the pattern boundary light shielding portion,
The light collecting member is a stereoscopic image display device configured such that light from the backlight is focused on a color opening of the color filter. The patterned polarizing film comprises a linear polarizer and a patterned retardation film from the liquid crystal cell side,
The pattern retardation film has a right-eye retardation region corresponding to the right-eye polarization region, and a left-eye retardation region corresponding to the left-eye polarization region,
2. The stereoscopic image display according to claim 1, wherein the right-eye retardation region and the left-eye retardation region have optical characteristics for converting linearly polarized light emitted from the linear polarizer into mutually orthogonal polarized light. apparatus.   The phase difference region for the right eye and the phase difference region for the left eye of the pattern phase difference film are orthogonal to each other in the slow axis direction, and both have retardation of ¼ wavelength. The three-dimensional image display device described.   The stereoscopic image display device according to any one of claims 1 to 3, wherein the pattern polarizing film does not have a light-shielding portion on a boundary between the right-eye polarizing region and the left-eye polarizing region.   The said backlight is a condensing backlight in which the light quantity of the normal line direction of the liquid crystal cell surface was relatively increased compared with the light quantity of the diagonal direction, The any one of Claims 1-4 3D image display device. The condensing member is a lenticular lens in which a plurality of cylindrical lenses extending in the second direction are arranged along the first direction,
The video display device according to claim 1, wherein each cylindrical lens is disposed so as to correspond to a pattern of a right-eye video region and a left-eye video region of the liquid crystal cell.

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