US20120075698A1 - Light source device and stereoscopic display - Google Patents

Light source device and stereoscopic display Download PDF

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Publication number
US20120075698A1
US20120075698A1 US13/235,647 US201113235647A US2012075698A1 US 20120075698 A1 US20120075698 A1 US 20120075698A1 US 201113235647 A US201113235647 A US 201113235647A US 2012075698 A1 US2012075698 A1 US 2012075698A1
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United States
Prior art keywords
light
light source
guide plate
internal reflection
reflection plane
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Abandoned
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US13/235,647
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English (en)
Inventor
Masaru Minami
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Sony Corp
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Sony Corp
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Assigned to SONY CORPORATION reassignment SONY CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MINAMI, MASARU
Publication of US20120075698A1 publication Critical patent/US20120075698A1/en
Priority to US14/177,613 priority Critical patent/US9285597B2/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
    • G02B30/30—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving parallax barriers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/34—Stereoscopes providing a stereoscopic pair of separated images corresponding to parallactically displaced views of the same object, e.g. 3D slide viewers
    • G02B30/36—Stereoscopes providing a stereoscopic pair of separated images corresponding to parallactically displaced views of the same object, e.g. 3D slide viewers using refractive optical elements, e.g. prisms, in the optical path between the images and the observer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
    • G02B30/27—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving lenticular arrays

Definitions

  • the present technology relates to a light source device and a stereoscopic display capable of achieving stereoscopic vision by a parallax barrier system.
  • FIG. 13 illustrates a typical configuration example of the parallax barrier system stereoscopic display.
  • a parallax barrier 101 is disposed to face a front surface of a two-dimensional display panel 102 .
  • shielding sections 111 shielding display image light from the two-dimensional display panel 102 and stripe-shaped opening sections (slit sections) 112 allowing the display image light to pass therethrough are alternately arranged in a horizontal direction.
  • An image based on three-dimensional image data is displayed on the two-dimensional display panel 102 .
  • a plurality of parallax images including different parallax information, respectively are prepared as three-dimensional image data, and each of the parallax images are separated into, for example, a plurality of stripe-shaped separated images extending in a vertical direction. Then, the separated images of the plurality of parallax images are alternately arranged in a horizontal direction to produce a composite image including a plurality of stripe-shaped parallax images in one screen, and the composite image is displayed on the two-dimensional display panel 102 .
  • the composite image displayed on the two-dimensional display panel 102 is viewed through the parallax barrier 101 .
  • a slit width in the parallax barrier 101 and the like are appropriately set, in the case where a viewer watches the stereoscopic display from a predetermined position and a predetermined direction, light rays from different parallax images are allowed to enter into left and right eyes 10 L and 10 R of the viewer, respectively, through the slit sections 112 .
  • a stereoscopic image is perceived.
  • the left and right eyes 10 L and 10 R To achieve stereoscopic vision, it is necessary for the left and right eyes 10 L and 10 R to view different parallax images, respectively, so two or more parallax images, that is, an image for right eye and an image for left eye are necessary. In the case where three or more parallax images are used, multi-view vision is achievable. When more parallax images are used, stereoscopic vision in response to changes in viewing position of the viewer is achievable. In other words, motion parallax is obtained.
  • the parallax barrier 101 is disposed in front of the two-dimensional display panel 102 .
  • the parallax barrier 101 may be disposed behind the two-dimensional display panel 101 (refer to FIG. 3 in Japanese Unexamined Patent Application Publication No. 2007-187823).
  • stereoscopic display is allowed to be performed based on the same principle as that in the configuration example in FIG. 13 .
  • FIG. 3 in Japanese Unexamined Patent Application Publication No. 2007-187823 illustrates a configuration in which a first light source as a backlight and a first light guide plate, and a second light source and a second light guide plate are included and a parallax barrier is disposed between the first light guide plate and the second light guide plate.
  • a first light source as a backlight and a first light guide plate
  • a second light source and a second light guide plate are included and a parallax barrier is disposed between the first light guide plate and the second light guide plate.
  • the first light source and the first light guide plate are used to perform two-dimensional display
  • the second light source, the second light guide plate and the parallax barrier are used to perform three-dimensional display.
  • switching between two-dimensional display and three-dimensional display is performed by selectively switching from one of two light sources to another.
  • a semi-transparent member is used for the first light guide plate to achieve switching between two-dimensional display and three-dimensional display. Therefore, for example, in the case where a reflective film including a semi-transparent member with a transmittance of 50% is used, light utilization rates of the first and second light guide plates are 50%, thereby reducing light use efficiency. Moreover, for example, in the case where small scattering particles as the semi-transparent member are included in the first light guide plate, light having directivity and having passed through the second light guide plate and a parallax barrier is scattered by the first light guide plate to cause some issues such as a deterioration in three-dimensional display quality.
  • a light source device including: a light guide plate having a first internal reflection plane and a second internal reflection plane which face each other; a first light source applying first illumination light from a side surface of the light guide plate into an interior thereof; a second light source disposed to face the second internal reflection plane of the light guide plate, and applying second illumination light to the second internal reflection plane; and a reflective member disposed between the second internal reflection plane and the second light source, in which the second internal reflection plane is provided with a total-reflection region and a scattering region, the total-reflection region allowing the first illumination light to be reflected in a manner of total-internal-reflection whereas allowing the second illumination light to pass therethrough, and the scattering region allowing the first illumination light to be reflected and scattered, and the reflective member is disposed in a position corresponding to the scattering region, and reflects light having passed through the scattering region, toward the first internal reflection plane.
  • a stereoscopic display including: a display section displaying an image; and a light source device emitting light for image display toward the display section, in which the light source device is configured of the light source device according to the above-described embodiment of the technology.
  • the first illumination light from the first light source is totally reflected between the first internal reflection plane and the second internal reflection plane in an interior of the light guide plate.
  • a part or all of the first illumination light scattered and reflected by the scattering region on the second internal reflection plane exits from the first internal reflection plane as light rays out of a total-reflection condition.
  • the reflective member is disposed in a position corresponding to the scattering region between the second internal reflection plane and the second light source; therefore, the light is reflected as a light ray out of the total-reflection condition toward the first internal reflection plane.
  • the first illumination light is allowed to be used efficiently.
  • the second illumination light from the second light source passes through the total-reflection region on the second internal reflection plane to become a light ray out of the total-reflection condition on the first internal reflection plane, and exit from the first internal reflection plane of the light guide plate. Therefore, the light guide plate is allowed to have a function as a parallax barrier.
  • the light guide plate is allowed to equivalently function as a parallax barrier with the scattering region as an opening section (a slit section) and the total-reflection region as a shielding section for the first illumination light from the first light source.
  • illumination light for two-dimensional display and illumination light for three-dimensional display are obtainable. More specifically, in the case where three-dimensional display is performed, the first light source is in an ON (light-on) state, and the second light source is in an OFF (light-off) state. In this case, the first illumination light scattered and reflected by the scattering region of the second internal reflection plane of the light guide plate passes through the first internal reflection plane of the light guide plate to exit from the light guide plate.
  • the first light source is in an ON (light-on) state or in an OFF (light-off) state
  • the second light source is in an ON (light-on) state.
  • the second illumination light exit from substantially the entire first internal reflection plane of the light guide plate.
  • the scattering region and the total-reflection region are disposed in the second internal reflection plane of the light guide plate, and the first illumination light from the first light source and the second illumination light from the second light source are allowed to selectively exit from the light guide plate; therefore, the light guide plate is allowed to equivalently function as a parallax barrier.
  • the reflective member is disposed in a position corresponding to the scattering region between the second internal reflection plane of the light guide plate and the second light source, and light having passed through the scattering region is reflected toward the first internal reflection plane. Therefore, while preventing a decline in light use efficiency, illumination light for two-dimensional display and illumination light for three-dimensional display are selectively obtainable. Therefore, while preventing a decline in light use efficiency, switching between two-dimensional display and three-dimensional display is allowed to be performed without deteriorating display quality.
  • FIG. 1 is a sectional view illustrating a configuration example of a stereoscopic display according to a first embodiment of the technology with a state of emission of light rays from a light source device in the case where only a first light source is in an ON (light-on) state.
  • FIG. 2 is a sectional view illustrating a configuration example of the stereoscopic display illustrated in FIG. 1 with a state of emission of light rays from the light source device in the case where only a second light source is in an ON (light-on) state.
  • FIG. 3 is a sectional view illustrating a configuration example of the stereoscopic display illustrated in FIG. 1 with a state of emission of light rays from the light source device in the case where both of the first light source and the second light source are in an ON (light-on) state.
  • FIGS. 4A and 4B are a sectional view illustrating a first configuration example of a light guide plate surface in the stereoscopic display illustrated in FIG. 1 , and a schematic explanatory diagram illustrating scattering/reflection states of light rays on the light guide plate surface illustrated in FIG. 4A , respectively.
  • FIGS. 5A and 5B are a sectional view illustrating a second configuration example of the light guide plate surface in the stereoscopic display illustrated in FIG. 1 , and a schematic explanatory diagram illustrating scattering/reflection states of light rays on the light guide plate surface illustrated in FIG. 5A , respectively.
  • FIGS. 6A and 6B are a sectional view illustrating a third configuration example of the light guide plate surface in the stereoscopic display illustrated in FIG. 1 , and a schematic explanatory diagram illustrating scattering/reflection states of light rays on the light guide plate surface illustrated in FIG. 6A , respectively.
  • FIG. 7 is a plot illustrating an example of an intensity distribution of light observed on a display section side and a second light source side in the case where only the first light source in the light source device illustrated in FIG. 1 is in an ON (light-on) state.
  • FIG. 8 is a sectional view illustrating a configuration example of a stereoscopic display according to a second embodiment of the technology with a state of emission of light rays from a light source device in the case where only a first light source is in an ON (light-on) state.
  • FIGS. 9A and 9B are a sectional view illustrating a first configuration example in the case where a light guide plate surface in the stereoscopic display illustrated in FIG. 8 is processed into a recessed shape, and an explanatory diagram illustrating a second configuration example in the case where the light guide plate surface is processed into a recessed shape.
  • FIG. 10 is a sectional view illustrating a configuration example in the case where the light guide plate surface in the stereoscopic display illustrated FIG. 8 is processed into a projected shape.
  • FIGS. 11A and 11B are a sectional view illustrating a first configuration example in the case where a different member is disposed on the light guide plate surface in the stereoscopic display illustrated in FIG. 8 and an explanatory diagram illustrating a second configuration example in the case where a different member is disposed on the light guide plate surface.
  • FIG. 12 is an explanatory diagram illustrating a configuration of a stereoscopic display of a comparative example relative to the stereoscopic display illustrated in FIG. 1 .
  • FIG. 13 is a configuration diagram illustrating a typical configuration example of a parallax barrier system stereoscopic display.
  • FIGS. 1 to 3 illustrate a configuration example of a stereoscopic display according to a first embodiment of the technology.
  • the stereoscopic display includes a display section 1 which displays an image and a light source device which is disposed on a back surface of the display section 1 and emits light for image display toward the display section 1 .
  • the light source device includes a first light source 2 (a 2D/3D-display light source), a light guide plate 3 , a second light source 4 (2D-display light source) and a transparent substrate 5 .
  • the light guide plate 3 has a first internal reflection plane 3 A facing the display section 1 and a second internal reflection plane 3 B facing the second light source 4 .
  • the stereoscopic display includes a control circuit for the display section 1 or the like which is necessary for display; however, the control circuit or the like has the same configuration as that of a typical control circuit for display or the like, and will not be described herein.
  • the light source device includes a control circuit (not illustrated) performing ON (light-on)/OFF (light-off) control of the first light source 2 and the second light source 4 .
  • the stereoscopic display is allowed to selectively perform switching between a two-dimensional (2D) display mode on an entire screen and a three-dimensional (3D) display mode on the entire screen as necessary. Switching between the two-dimensional display mode and the three-dimensional display mode is allowed to be performed by switching control of image data to be displayed on the display section 1 and ON/OFF switching control of the first light source 2 and the second light source 4 .
  • FIG. 1 schematically illustrates a state of emission of light rays from the light source device in the case where only the first light source 2 is in an ON (light-on) state, and corresponds to the three-dimensional display mode.
  • FIG. 2 schematically illustrates a state of emission of light rays from the light source device in the case where only the second light source 4 is in an ON (light-on) state, and corresponds to the two-dimensional display mode.
  • FIG. 3 schematically illustrates a state of emission of light rays from the light source device in the case where both of the first light source 2 and the second light source 4 are in an ON (light-on) state, and corresponds to the two-dimensional display mode.
  • the display section 1 is configured with use of a transmissive two-dimensional display panel, for example, a transmissive liquid crystal display panel, and includes a plurality of pixels configured of, for example, R (red) pixels, G (green) pixels and B (blue) pixels, and the plurality of pixels are arranged in a matrix form.
  • the display section 1 displays a two-dimensional image by modulating light from the light source device from one pixel to another based on image data.
  • the display section 1 selectively displays one of an image based on three-dimensional image data and an image based on two-dimensional image data as necessary by switching.
  • the three-dimensional image data is, for example, data including a plurality of parallax images corresponding to a plurality of viewing angle directions in three-dimensional display.
  • the three-dimensional image data is data including parallax images for right-eye display and left-eye display.
  • three-dimensional display mode display is performed, as in the case of a parallax barrier system stereoscopic display in related art illustrated in FIG. 13 , for example, a composite image including a plurality of stripe-shaped parallax images in one screen is produced and displayed.
  • the first light source 2 is configured with use of, for example, a fluorescent lamp such as a CCFL (Cold Cathode Fluorescent Lamp), or an LED (Light Emitting Diode).
  • the first light source 2 applies first illumination light L 1 (refer to FIG. 1 ) from a side surface of the light guide plate 3 into an interior thereof.
  • One or more first light sources 2 are disposed on a side surface of the light guide plate 3 .
  • the light guide plate 3 has four side surfaces, and it is only necessary to arrange the first light source 2 on one or more of the four side surfaces.
  • the first light source 2 is disposed on each of two side surfaces facing each other of the light guide plate 3 .
  • ON/OFF control of the first light source 2 is performed in response to switching between the two-dimensional display mode and the three-dimensional display mode. More specifically, in the case where the display section 1 displays an image based on the three-dimensional image data (in the case of the three-dimensional display mode), the first light source 2 is controlled to be in a light-on state, and in the case where the display section 1 displays an image based on the two-dimensional image data (in the case of the two-dimensional display mode), the first light source 2 is controlled to be in a light-off state or a light-on state.
  • the second light source 4 is disposed to face the second internal reflection plane 3 B of the light guide plate 3 .
  • the second light source 4 externally applies second illumination light toward the second internal reflection plane 3 B (refer to FIGS. 2 and 3 ).
  • the second light source 4 may be a planar light source emitting light with uniform in-plane luminance, and the configuration thereof is not specifically limited, and the second light source 4 may be configured with use of a commercially available planar backlight. For example, a configuration using a light-emitting body such as a CCFL or an LED and a light-scattering plate for equalizing in-plane luminance, or the like is considered.
  • ON (light-on)/OFF (light-off) control of the second light source 4 is performed in response to switching between the two-dimensional display mode and the three-dimensional display mode. More specifically, in the case where the display section 1 displays an image based on the three-dimensional image data (in the case of the three-dimensional display mode), the second light source 4 is controlled to be in a light-off state, and in the case where the display section 1 displays an image based on the two-dimensional image data (in the case of the two-dimensional display mode), the second light source 4 is controlled to be in a light-on state.
  • the light guide plate 3 is configured of a transparent plastic plate of, for example, an acrylic resin. All surfaces except for the second internal reflection plane 3 B of the light guide plate 3 are entirely transparent. For example, in the case where the light guide plate 3 has a rectangular planar shape, the first internal reflection plane 3 A and four side surfaces are entirely transparent.
  • the entire first internal reflection plane 3 A is mirror-finished, and allows light rays incident at an incident angle satisfying a total reflection condition to be reflected, in a manner of total-internal-reflection, in the interior of the light guide plate 3 and allows light rays out of the total-reflection condition to exit therefrom.
  • the second internal reflection plane 3 B has a scattering region 31 and a total-reflection region 32 .
  • the scattering region 31 is formed by laser processing, sandblast processing or coating on a surface of the light guide plate 3 or bonding a sheet-like light-scattering member on the surface of the light guide plate 3 .
  • the scattering region 31 and the total-reflection region 32 function as an opening section (a slit section) and a shielding section of a parallax barrier for the first illumination light L 1 from the first light source 2 , respectively.
  • the scattering region 31 and the total-reflection region 32 are arranged in a pattern forming a configuration corresponding to a parallax barrier.
  • the total-reflection region 32 is arranged in a pattern corresponding to a shielding section in the parallax barrier
  • the scattering region 31 is arranged in a pattern corresponding to an opening section in the parallax barrier.
  • a barrier pattern of the parallax barrier for example, a stripe pattern in which a large number of vertically long slit-like opening sections are arranged in parallel with shielding sections in between is known.
  • the barrier pattern any of various known barrier patterns in related art may be used, and the barrier pattern is not specifically limited.
  • the first internal reflection plane 3 A and the total-reflection region 32 of the second internal reflection plane 3 B reflect light rays incident at an incident angle ⁇ 1 satisfying a total reflection condition in a manner of total-internal-reflection (reflect light rays incident at the incident angle ⁇ 1 larger than a predetermined critical angle ⁇ in a manner of total-internal-reflection). Therefore, the first illumination light L 1 incident from the first light source 2 at the incident angle ⁇ 1 satisfying the total reflection condition is guided to a side surface direction by internal total reflection between the first internal reflection plane 3 A and the total-reflection region 32 of the second internal reflection plane 3 B. Moreover, as illustrated in FIG. 2 or FIG. 3 , the total-reflection region 32 allows the second illumination light from the second light source 4 to pass therethrough to emit the second illumination light as a light ray out of the total-reflection condition toward the first internal reflection plane 3 A.
  • the critical angle ⁇ is represented as follow, where the refractive index of the light guide plate 3 is n 1 , and the refractive index of a medium (an air layer) outside the light guide plate 3 is n 0 ( ⁇ n 1 ).
  • the angles ⁇ and ⁇ 1 are angles with respect to a normal to a surface of the light guide plate.
  • the incident angle ⁇ 1 satisfying the total reflection condition is ⁇ 1 > ⁇ .
  • the scattering region 31 scatters and reflects the first illumination light L 1 from the first light source 2 and emits partial light L 2 of the first illumination light L 1 toward the first internal reflection plane 3 A as a light ray out of the total-reflection condition.
  • the transparent substrate 5 is disposed between the second internal reflection plane 3 B and the second light source 4 .
  • the transparent substrate 5 is configured of, for example, a glass substrate, and a reflection region 51 is disposed on a surface thereof in a position corresponding to the scattering region 31 in the light guide plate 3 .
  • a region except for the reflection region 51 is a transparent region 52 .
  • the size of the reflection region 51 is preferably equal to or slightly larger than that of the scattering region 31 .
  • the reflection region 51 is preferably in proximity to the scattering region 31 (is in full contact with the scattering region 31 or is disposed to face the scattering region 31 with a slight space in between).
  • a high-reflectivity reflective member is disposed by, for example, printing or evaporation.
  • a regular reflective material such as silver or an irregular reflective material such as barium sulfate may be used.
  • the reflection region 51 of the transparent substrate 5 reflects the light L 3 having passed through the scattering region 31 toward the first internal reflection plane 3 A.
  • the reflection region 51 is disposed in a position corresponding to and in proximity to the scattering region 31 of the light guide plate 3 ; therefore, the light L 3 having passed through the scattering region 31 is allowed to be reflected toward the first internal reflection plane 3 A as light equivalent to the light L 2 scattered and reflected by the scattering region 31 , that is, effective light for three-dimensional display.
  • FIG. 4A illustrates a first configuration example of the second internal reflection plane 3 B in the light guide plate 3 .
  • FIG. 4B schematically illustrates reflection and scattering states of light rays on the second internal reflection plane 3 B in the first configuration example illustrated in FIG. 4A .
  • the scattering region 31 is a recessed scattering region 31 A with respect to the total-reflection region 32 .
  • Such a recessed scattering region 31 A is allowed to be formed by, for example, sandblast processing or laser processing.
  • a surface of the light guide plate 3 is minor-finished, and then a portion corresponding to the scattering region 31 A is subjected to laser processing to form the scattering region 31 A.
  • first illumination light L 11 incident from the first light source 2 at the incident angle ⁇ 1 satisfying the total reflection condition is reflected in a manner of total-internal-reflection by the total-reflection region 32 of the second internal reflection plane 3 B.
  • some light rays of first illumination light L 12 having entered the recessed scattering region 31 A do not satisfy the total reflection condition on a side surface portion 33 of a recessed shape, and are scattered and pass through the side surface portion 33 , and other light rays are scattered and reflected.
  • FIG. 5A illustrates a second configuration example of the second internal reflection plane 3 B of the light guide plate 3 .
  • FIG. 5B schematically illustrates reflection and scattering states of light rays on the second internal reflection plane 3 B in the second configuration example in FIG. 5A .
  • the scattering region 31 is a projected scattering region 31 B with respect to the total-reflection region 32 .
  • Such a projected scattering region 31 B is allowed to be formed, for example, by molding a surface of the light guide plate 3 by a die. In this case, a portion corresponding to the total-reflection region 32 is minor-finished by a surface of the die.
  • the first illumination light L 11 incident from the first light source 2 at the incident angle ⁇ 1 satisfying the total reflection condition is reflected in a manner of total-internal-reflection by the total-reflection region 32 of the second internal reflection plane 3 B.
  • some light rays of the first illumination light L 12 having entered the projected scattering region 31 B do not satisfy the total reflection condition on a side surface portion 34 of a projected shape, and are scattered and pass through the side surface portion 34 , and other light rays are scattered and reflected.
  • some or all light rays scattered and reflected are emitted as light rays L 2 out of the total-reflection condition toward the first internal reflection plane 3 A.
  • light scattered and having passed through the side surface portion 34 is emitted as a light ray L 3 out of the total-reflection condition toward to the first internal reflection plane 3 A by the reflection region 51 of the transparent substrate 5 .
  • FIG. 6A illustrates a third configuration example of the second internal reflection plane 3 B of the light guide plate 3 .
  • FIG. 6B schematically illustrates the reflection and scattering states of light rays on the second internal reflection plane 3 B in the third configuration example illustrated in FIG. 6A .
  • the surface of the light guide plate 3 is processed into a geometry different from that of the total-reflection region 32 to form the scattering region 31 .
  • a light-scattering member 35 made of a material different from that of the light guide plate 3 is disposed on a surface, corresponding to the second internal reflection plane 3 B, of the light guide plate 3 .
  • a white paint for example, barium sulfate
  • the first illumination light L 11 incident from the first light source 2 at the incident angle ⁇ 1 satisfying the total reflection condition is reflected by the total-reflection region 32 on the second internal reflection plane 3 B in a manner of total-internal-reflection.
  • the display section 1 displays an image based on the three-dimensional image data, and ON (light-on)/OFF (light-off) control of the first light source 2 and the second light source 4 is performed for three-dimensional display. More specifically, as illustrated in FIG. 1 , the first light source 2 is controlled to be in an ON (light-on) state, and the second light source 4 is controlled to be in an OFF (light-off) state.
  • the first illumination light L 1 from the first light source 2 is reflected repeatedly in a manner of total-internal-reflection between the first internal reflection plane 3 A and the total-reflection region 32 of the second internal reflection plane 3 B in the light guide plate 3 to be guided and emitted from a side surface where the first light source 2 is disposed to the other side surface facing the side surface.
  • a part of the first illumination light L 1 from the first light source 2 is scattered and reflected from the scattering region 31 of the light guide plate 3 to pass through the first internal reflection plane 3 A of the light guide plate 3 and exit from the light guide plate 3 . Therefore, the light guide plate 3 is allowed to have a function as a parallax barrier.
  • the light guide plate 3 is allowed to equivalently function as a parallax barrier with the scattering region 31 as an opening section (slit section) and the total-reflection region 51 as a shielding section. Therefore, three-dimensional display by a parallax barrier system in which the parallax barrier is equivalently disposed on a back surface of the display section 1 is performed.
  • a reflective member (the reflection region 51 of the transparent substrate 5 ) is disposed in a position corresponding to the scattering region 31 between the second internal reflection plane 3 B and the second light source 4 ; therefore, the light L 3 having passed through the scattering region 31 is reflected toward the first internal reflection plane 3 A as a light ray out of the total-reflection condition. Therefore, the first illumination light L 1 is allowed to be used efficiently as effective light for three-dimensional display.
  • the display section 1 displays an image base on the two-dimensional image data, and ON (light-on)/OFF (light-off) control of the first light source 2 and the second light source 4 is performed for two-dimensional display. More specifically, for example, as illustrated in FIG. 2 , the first light source 2 is controlled to be in an OFF (light-off) state, and the second light source 4 is controlled to be in an ON (light-on) state.
  • second illumination light from the second light source 4 passes through the total-reflection region 32 of the second internal reflection plane 3 B to exit as a light ray out of the total-reflection condition from substantially the entire first internal reflection plane 3 A.
  • the light guide plate 3 functions as a planar light source similar to a typical backlight. Therefore, two-dimensional display by a backlight system in which a typical backlight is equivalently disposed on a back surface of the display section 1 is performed.
  • the second illumination light is emitted from substantially the entire surface of the light guide plate 3 , and if necessary, the first light source 2 may be turned on as illustrated in FIG. 3 . Therefore, for example, in the case where there is a difference in a luminance distribution between portions corresponding to the scattering region 31 and the total-reflection region 32 in a state where only the second light source 4 emits light, the lighting state of the first light source 2 is appropriately adjusted (ON/OFF control or the lighting amount of the first light source 2 is adjusted), thereby allowing the luminance distribution in an entire surface to be optimized. However, for example, in the case where luminance is sufficiently corrected in the display section 1 in two-dimensional display, it is only necessary for only the second light source 4 to be turned on.
  • FIG. 7 illustrates a simulation result of a light intensity distribution (orientation angle characteristics) in the case where the light source device of the stereoscopic display illustrated in FIG. 1 is in a state corresponding to the three-dimensional display (a state where the first light source 2 is in an ON (light-on) state and the second light source 4 is in an OFF (light-off) state).
  • FIG. 7 as a comparative example, a simulation result of a light intensity distribution in a configuration in which a reflective member (the transparent substrate 5 ) is not disposed between the second internal reflection plane 3 B and the second light source 4 (refer to FIG. 12 ) is illustrated.
  • a reflective member the transparent substrate 5
  • a horizontal axis indicates angle (where a direction orthogonal to a light emission surface is 0°) and a vertical axis indicates standardized light intensity (arbitrary unit (a.u.)).
  • the size of a pattern of the scattering region 31 in the light guide plate 3 and the size of a pattern of the reflection region 51 in the transparent substrate 5 are equal to each other.
  • the reflection region 51 is disposed directly below the scattering region 31 (the scattering region 31 and the reflection region 51 are not in contact with each other).
  • a regular reflective material with a reflectivity of 90% is used for the reflection region 51 .
  • the light intensity on the vertical axis is standardized with reference to a maximum light amount of light emitted from the light guide plate 3 to the display section 1 in a state where a reflective member (the transparent substrate 5 ) is not disposed.
  • a curve with a reference numeral 61 indicates the intensity of light emitted to the display section 1 in the configuration illustrated in FIG. 1
  • a curve with a reference numeral 62 indicates the intensity of light emitted to the second light source 4 in the configuration illustrated in FIG. 1
  • a curve with a reference numeral 64 indicates the intensity of light emitted to the display section 1 in a configuration of the comparative example illustrated in FIG. 12
  • a curve with a reference numeral 63 indicates the intensity of light emitted to the second light source 4 in the configuration of the comparative example illustrated in FIG. 12 .
  • a light amount equal to approximately twice the light amount obtained by the light source device of the comparative example is obtained on the display section 1 side.
  • a large amount of light is emitted to the second light source 4 ; however, in the light source device according to the embodiment, light is hardly emitted to the second light source 4 . In other words, it is obvious that light use efficiency is high.
  • the scattering region 31 and the total-reflection region 32 are disposed in the second internal reflection plane 3 B of the light guide plate 3 , and the first illumination light from the first light source 2 and the second illumination light from the second light source 4 are allowed to selectively exit from the light guide plate 3 ; therefore, the light guide plate 3 is allowed to equivalently function as a parallax barrier.
  • a reflective member (the reflection region 51 of the transparent substrate 5 ) is disposed in a position corresponding to the scattering region 31 between the second internal reflection plane 3 B of the light guide plate 3 and the second light source 4 to reflect light having passed through the scattering region 31 to the first internal reflection plane 3 A; therefore, while preventing a decline in light use efficiency, illumination light for two-dimensional display and illumination light for three-dimensional display are allowed to be selectively obtained. Therefore, while preventing a decline in light use efficiency, switching between two-dimensional display and three-dimensional display is allowed to be performed without deteriorating display quality.
  • the reflection region 51 is disposed in a position corresponding to and in proximity to the scattering region 31 of the light guide plate 3 ; therefore, light L 3 having passed through the scattering region 31 is allowed to be reflected toward the first internal reflection plane 3 A as light equivalent to light L 2 scattered and reflected by the scattering region 31 , that is, effective light for three-dimensional display. Therefore, the light L 3 having passed through the scattering region 31 is allowed to be prevented from being emitted to an unintended direction, and the occurrence of crosstalk is preventable accordingly.
  • a stereoscopic display according to a second embodiment of the technology will be described below. It is to be noted that like components are denoted by like numerals as of the stereoscopic display according to the first embodiment and will not be further described.
  • FIG. 8 illustrates a configuration example of the stereoscopic display according to the second embodiment of the technology.
  • the stereoscopic display according to the embodiment has the same configuration as that of the stereoscopic display in FIG. 1 , except that the transparent substrate 5 in the light source device is not included. Instead of the transparent substrate 5 , a reflective member is disposed in a position corresponding to the scattering region 31 in the second internal reflection plane 3 B of the light guide plate 3 .
  • FIGS. 9A and 9B illustrate a configuration example in which in the case where the second internal reflection plane 3 B of the light guide plate 3 has the recessed scattering region 31 A as in the case of the configuration example in FIGS. 4A and 4B , a reflective member is disposed on the recessed scattering region 31 A.
  • a reflective member As the reflective member, a reflective film 36 made of a high-reflectivity material is formed on a surface of the recessed scattering region 31 A by, for example, evaporation.
  • a high-reflectivity material 37 as a reflective member is filled in the recessed scattering region 31 A by, for example, screen printing, thereby allowing an entire surface of the recessed scattering region 31 A to be covered therewith.
  • FIG. 10 illustrates a configuration example in which in the case where the second internal reflection plane 3 B of the light guide plate 3 has the projected scattering region 31 B as in the case of the configuration example in FIGS. 5A and 5B , a reflective member is disposed on the projected scattering region 31 B.
  • a reflective member As the reflective member, a reflective film 36 made of a high-reflectivity material is formed on a surface of the projected scattering region 31 B by, for example, evaporation.
  • FIG. 11A illustrates a configuration example in which in the case where the light-scattering member 35 made of a different material from the material of the light guide plate 3 is disposed on a surface of the second internal reflection plane 3 B of the light guide plate 3 as in the case of the configuration example in FIGS. 6A and 6B , a reflective member is disposed on the light-scattering member 35 .
  • a reflective film 36 made of a high-reflectivity material is formed on a surface of the light-scattering member 35 by, for example, screen printing.
  • a thickness d of the light-scattering member 35 is increased to allow the light-scattering member 35 to have a function as a reflective member. As long as the reflectivity of the light-scattering member 35 is high, a configuration illustrated in FIG. 11B may be applicable.
  • a reflective member is directly disposed in a position corresponding to the scattering region 31 of the second internal reflection plane 3 B of the light guide plate 3 without arranging the transparent substrate 5 between the second internal reflection plane 3 B and the second light source 4 ; therefore, the number of components is reduced, compared to the stereoscopic display in FIG. 1 , and space saving is achievable.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)
  • Stereoscopic And Panoramic Photography (AREA)
  • Indication In Cameras, And Counting Of Exposures (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
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TWI453506B (zh) 2014-09-21
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TW201229634A (en) 2012-07-16
KR20120031886A (ko) 2012-04-04
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CN102563401B (zh) 2015-08-19

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