WO2008041559A1 - Système d'éclairage à panneau plat et dispositif d'affichage à cristaux liquides utilisant celui-ci - Google Patents
Système d'éclairage à panneau plat et dispositif d'affichage à cristaux liquides utilisant celui-ci Download PDFInfo
- Publication number
- WO2008041559A1 WO2008041559A1 PCT/JP2007/068568 JP2007068568W WO2008041559A1 WO 2008041559 A1 WO2008041559 A1 WO 2008041559A1 JP 2007068568 W JP2007068568 W JP 2007068568W WO 2008041559 A1 WO2008041559 A1 WO 2008041559A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- illumination device
- laser light
- planar illumination
- light
- guide plate
- Prior art date
Links
Classifications
-
- 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
- G02B6/0045—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 by shaping at least a portion of the light guide
- G02B6/0046—Tapered light guide, e.g. wedge-shaped 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
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0025—Diffusing sheet or layer; Prismatic sheet or layer
-
- 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
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/003—Lens or lenticular sheet or layer
-
- 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
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0031—Reflecting element, sheet or layer
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
- H01S5/4012—Beam combining, e.g. by the use of fibres, gratings, polarisers, prisms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
- H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
Definitions
- the present invention relates to a thin planar illumination device using a laser element as a light source, and a liquid crystal display device using the planar illumination device.
- Patent Document 1 uses a configuration in which a bar-shaped light guide 400 is provided close to the side surface of the light guide plate 500 and two LED elements 300 are provided at both ends of the bar-shaped light guide 400 as shown in FIG. The With this configuration, the light from the two LED elements 300 is multiplexed inside the rod-shaped light guide 400. After obtaining a uniform light amount distribution by reflection, the light is incident on the side surface of the light guide plate 500 from the side surface of the rod-shaped light guide 400.
- Patent Document 1 Japanese Patent Laid-Open No. 11 271767
- a laser element exists as an element that can obtain higher luminance than an LED element. Therefore, in the configuration of Patent Document 1, it is conceivable to apply a laser element to a light source instead of an LED element, but the following problems are newly generated.
- a laser element that is a parallel light source that emits parallel light causes less reflection of light within the rod-shaped light guide.
- a uniform line-shaped light source cannot be obtained.
- the light emission angle is L in detail.
- a uniform line light source cannot be obtained simply by providing a semiconductor laser at the end of the rod-shaped light guide.
- an object of the present invention is to provide a thin * large area planar illumination device using a laser element as a light source, and a liquid crystal display device using the planar illumination device.
- the present invention is directed to a planar illumination device using laser light.
- the planar illumination device of the present invention emits a laser beam having a uniform polarization plane and a laser beam emitted from the laser light source in a one-dimensional direction at an angle ⁇ .
- a light guide plate that is incident on one of the side surfaces in a state where the one-dimensional direction and the main surface are parallel to each other and exits from one main surface.
- the force that further converges the laser light diffused by the one-dimensional diffusion element in the thickness direction of the light guide plate by the cylindrical lens, and the laser light emitted from the laser light source by the one-dimensional diffusion element are further increased. Make it converge in a direction orthogonal to the one-dimensional direction, It is preferable.
- a mirror that reflects the laser light emitted from the cylindrical lens and makes it incident on one side surface of the light guide plate may be further provided.
- the laser light source, the one-dimensional diffusing element, and the cylindrical lens can be mounted on the other main surface opposite to the one main surface.
- the diffusion angle ⁇ by the one-dimensional diffusing element is that the main surface size of the light guide plate is the long side W and the short side H, and the laser light power emitted from the cylindrical lens is incident from the side in contact with the long side W. Is given by “ ⁇ > tan— ⁇ W / SH) X 2”, and when incident from the side contacting the short side H, “ ⁇ > tan— ⁇ H / SW) X 2”.
- one-dimensional diffusion or a vibration unit that may further include a vibration unit that minutely vibrates the one-dimensional diffusion element is set to a vibration frequency other than an audible frequency. It is effective if it is set as the interval between points.
- the polarization plane of the laser light emitted from the laser light source is preferably parallel or perpendicular to the main surface of the light guide plate.
- the laser light source is a Marchemitta semiconductor laser
- the laser light source emits a plurality of laser beams having different wavelengths.
- a light source may be used. In this case, light of a plurality of wavelengths emitted from each light source may be incident on the one-dimensional diffusion element with a width less than the thickness of the light guide plate.
- the laser light source described above includes a plurality of light sources that emit laser beams having different wavelengths, an optical fiber that transmits a plurality of laser beams emitted from the light source, and a laser emitted from the optical fiber. It may be configured with a polarization separator that aligns the polarization plane of light! In this case, the polarization separation unit separates the laser light into P-polarized light and S-polarized light, outputs either P-polarized light or S-polarized light as the first output light, and outputs the other as polarized light of the first output light. It may be possible to output it as a second output light that is aligned with the surface.
- Each of the above-described planar illumination devices is combined with a liquid crystal panel that is illuminated with laser light emitted from the planar illumination device and an image display circuit that drives the liquid crystal panel.
- a liquid crystal display device can be configured.
- the present invention it is possible to realize a thin and large-area planar illumination device and a liquid crystal display device using a laser element as a light source. Further, since the laser light emitted from the laser element has high color purity and high light emission efficiency, wide color reproducibility, uniform luminance, and low power consumption can be realized.
- FIG. 1 is a perspective view showing a configuration of a planar illumination device according to a first embodiment of the present invention.
- FIG. 2 is a diagram showing a configuration example of a light source 30.
- FIG. 3 is a diagram showing another configuration example of the light source 30.
- FIG. 4 is a diagram showing an example of a detailed configuration of a Marchemitta semiconductor laser 50.
- FIG. 5 is a diagram showing a configuration example of the one-dimensional diffusing element 5
- Fig. 6 is a diagram for explaining a drive unit for vibrating the one-dimensional diffusion element 5.
- FIG. 7 is a diagram for explaining a specific design example of the planar lighting device.
- FIG. 8 is a diagram for explaining a specific design example of the planar lighting device.
- FIG. 9 is a perspective view showing a configuration of a planar lighting device according to a second embodiment of the present invention.
- FIG. 10 is a diagram showing a configuration example of the light source 1
- FIG. 11 is a diagram showing a configuration example of the polarization separation unit 3
- FIG. 12 is a perspective view showing a configuration of a planar illumination device according to a third embodiment of the present invention.
- FIG. 13 is a diagram showing a configuration example of a one-dimensional diffusing element 40.
- FIG. 14 is a perspective view showing a configuration of a planar illumination device according to the fourth embodiment of the present invention.
- FIG. 15 is a perspective view of a planar illumination device according to the fifth embodiment of the present invention.
- FIG. 16 is a diagram showing an example of a liquid crystal display device using a planar illumination device.
- FIG. 17 is a diagram showing a detailed configuration example of the monitor unit 42.
- FIG. 18 is a perspective view showing the configuration of a conventional planar illumination device.
- FIG. 1 is a perspective view showing a configuration of a planar illumination device according to the first embodiment of the present invention.
- a planar illumination device according to the first embodiment shown in FIG. 1 includes a light source 30, a one-dimensional diffusing element 5, a first cylindrical lens 6, a second cylindrical lens 7, a mirror 8, and a light guide plate. 9 and The reflector 10 is provided.
- a reflection plate 10 is bonded on one main surface of the light guide plate 9, a reflection plate 10 is bonded.
- the light source 30, the one-dimensional diffusing element 5, the first cylindrical lens 6, and the second cylindrical lens 7 are mounted on the reflecting plate 10.
- the light emitted from the light source 30 is folded 180 degrees by the mirror 8 through the one-dimensional diffusing element 5, the first cylindrical lens 6, and the second cylindrical lens 7, and is guided to the light guide plate 9. Structure.
- the light source 30 is a laser light source that emits laser beams of three primary colors, and is configured as shown in FIG. 2, for example.
- the light source 30 includes a red laser light source 31, a green laser light source 32, a blue laser light source 33, and mirrors 34 and 35.
- the green laser light emitted from the green laser light source 32 is directly input to the one-dimensional diffusion element 5.
- the red laser light emitted from the red laser light source 31 is reflected by the mirror 34 and is input to the one-dimensional diffusion element 5 in close proximity and parallel to the green laser light.
- the blue laser light emitted from the blue laser light source 33 is reflected by the mirror 35 and input to the one-dimensional diffusing element 5 in close proximity and parallel to the green laser light.
- the polarization plane of each laser beam emitted from the red laser light source 31, the green laser light source 32, and the blue laser light source 33 is adjusted in advance so that all the polarization planes are aligned when input to the one-dimensional diffusion element 5.
- the light source 30 may have a configuration other than that shown in FIG. 2 as long as the three primary color laser beams having the same polarization plane can be input to the one-dimensional diffusion element 5.
- FIG. 3 and FIG. 4 show a configuration example in the case where a Marchemiter semiconductor laser 50 is used as the light source 30.
- the multi-emitter semiconductor laser 50 is provided with a plurality of light-emitting regions in one chip, and can provide a higher output than a single-emitter semiconductor laser.
- a laser chip 53 having a plurality of light emitting regions is bonded to a mount.
- the mount 54 dissipates heat generated by the laser chip 53 and supplies power to the laser chip 53 in combination with an electrode (not shown).
- the cylindrical lens 55 is a lens that collimates the high-speed axis direction of the laser light emitted from the laser chip 53, and a plurality of laser lights 51a to 51a emitted from the laser chip 53 as shown in FIG. 51f, parallel light with a width equal to or less than the thickness of the light guide plate 9 or the entrance of the light guide plate 9 It is converted into weakly convergent light that converges on the incident surface.
- the cylindrical lens 55 and the one-dimensional diffusing element 5 are configured by arranging in a plane parallel to the main surface of the light guide plate 9 with a plurality of light emitting region forces of the Marchemitta semiconductor laser 50.
- a high output linear light source can be obtained with a small number of optical elements.
- the main surface of the light guide plate 9 and the light emitting region of the Marchitter semiconductor laser 50 are not physically parallel but are the same as this example as long as they are optically parallel, for example, using an image rotation prism. An effect is obtained.
- a cylindrical lens that collimates the slow axis direction of the laser light emitted from the laser chip 53 may be provided between the cylindrical lens 55 and the one-dimensional diffusing element 5.
- the angle of view on the slow axis side is NA0 by collimating the slow axis with a long cylindrical lens with a focal length of 50 mm or more, for example. Can be as small as 1. If the angle of view can be reduced, the effect of simplifying the design of the one-dimensional diffusion element 5 can be obtained.
- the one-dimensional diffusing element 5 is composed of a hologram or a lens array, and diffuses the laser light emitted from the light source 30 in the one-dimensional direction at an angle ⁇ (see FIGS. 2 and 3).
- the surface for diffusing the laser light is designed to be parallel to the main surface of the light guide plate 9.
- the diffused laser beams of the three primary colors almost overlap each other at a distance to become a white laser beam.
- FIG. 5 is a top view (al) and (a2), a front view (b), and a side view (c) showing a configuration example of the one-dimensional diffusion element 5.
- the one-dimensional diffusing element 5 shown in FIG. 5 has a structure in which a large number of cylindrical lenses 24 having curved surfaces on one side (al) or both sides (a2) in the X direction are arranged in an array.
- the laser beam 25 incident on the one-dimensional diffusing element 5 is divided into a plurality of cylindrical lenses 24 and then diverges in the X direction. Since the light emitted from each cylindrical lens 24 overlaps with each other in the distance, the intensity of the light incident on each cylindrical lens 24 is superimposed, and a substantially uniform intensity distribution is obtained in the distance.
- the curvatures of the many cylindrical lenses 24 constituting the one-dimensional diffusing element 5 may be the same or may be changed slightly. It is also possible to change the light quantity distribution by slightly changing the curvature.
- the angle ⁇ at which the one-dimensional diffusion element 5 diffuses the laser light is preferably designed as follows, for example.
- a light guide plate 9 having a long side W and a short side H is assumed.
- light guide plate 9 full width As shown in Fig. 1, when the one-dimensional diffusing element 5 is mounted at the center of the end face on the long side W of the light guide plate 9 as shown in Fig. 1, the angle ⁇ is expressed by the following equation [1] It is represented by Although not shown, when the one-dimensional diffusing element 5 is mounted at the center position of the end surface on the short side H side of the light guide plate 9, the angle ⁇ is expressed by the following equation [2].
- the first cylindrical lens 6 converts the laser light having a uniform polarization plane diffused by the one-dimensional diffusion element 5 at an angle ⁇ into parallel light.
- the second cylindrical lens 7 has a curvature in a plane orthogonal to the first cylindrical lens 6, and the laser light converted into parallel light by the first cylindrical lens 6 is converted into the light from the light guide plate 9. Converge in the thickness direction.
- the second cylindrical lens 7 can improve the coupling efficiency of light incident on the light guide plate 9, and a bright planar illumination device can be obtained.
- the mirror 8 is a reflecting plate having an L-shaped cross section, and the laser beam converged in the thickness direction of the light guide plate 9 by the second cylindrical lens 7 is reflected to the light guide plate 9 twice at right angles. With this L-shaped cross-section mirror 8, the optical system configuration for laser polarization separation and diffusion / convergence can be provided on the main surface of the light guide plate 9, and the planar illumination device can be miniaturized.
- the light guide plate 9 is composed of two parallel principal surfaces and four side surfaces perpendicular to the principal surfaces and a force, that is, a rectangular parallelepiped.
- the laser light incident on the light guide plate 9 is emitted from the main surface of the light guide plate 9 while traveling in the light guide plate 9 while repeating multiple reflections or scattering. Since the reflecting plate 10 is attached to one main surface of the light guide plate 9 and the laser light is emitted only from the other main surface, a bright planar illumination device with uniform illuminance can be obtained.
- speckle noise which is a random interference pattern
- the interference pattern can be changed by vibrating the one-dimensional diffusion element 5 using the driving unit shown in FIG.
- the one-dimensional diffusing element 5 is held by a linear actuator 26, and moves in the X direction when the linear actuator 26 moves along the guide 27.
- the guide 27 is held by the linear actuator 28, and moves in the Y direction in the figure when the linear actuator 28 moves along the guide 29.
- the one-dimensional diffusion element 5 can be moved in two directions. [0031] If the one-dimensional diffusion element 5 is moved at a vibration frequency of, for example, 10 Hz or more, the interference pattern cannot be recognized by the human eye, and speckle noise also disappears.
- the vibration frequency of the one-dimensional diffusion element 5 may be moved to a position where the bright spot of the speckle pattern overlaps with the adjacent bright spot, that is, the distance between the bright spots of the speckle noise.
- FIG. 7 is a diagram illustrating a line diffuser that is a basic configuration of the optical system.
- a Bartier diode diode (wavelength: 642 nm, output: 4 W) was used for higher output.
- the light emitted from the laser light source is collimated for each X-Z axis and Y-Z axis by a FAC (Fast Axis Collimator) lens and a SAC (Slow Axis Collimator) lens.
- the collimated light is divided by a one-dimensional diffusing element (double-sided wrench lens) and superimposed on each other, and then becomes substantially parallel light by a cylindrical Fresnel lens and enters the light guide plate.
- the size of the light guide plate was 32 inches diagonal W: 700 mm X H: 400 mm, and light was incident from the W: 700 mm side.
- the bar laser diode used as a laser light source has a configuration in which 33 emitters with a stripe width of 60 m are arranged at a pitch of 300 mm in a width of 10 mm.
- the spread angle (full width at half maximum) from each emitter is about 10 degrees in the stripe width direction and about 40 degrees in the direction perpendicular to the stripe width.
- the collimating lens of the laser light source is preferably a high NA lens from the viewpoint of capture efficiency, while in order to collimate the emitter distributed over a length of 10 mm, a long-focus lens is preferred in order to reduce the angle of view.
- High NA and long focal length lenses are inevitably large, but in order to avoid an increase in the size of the device, two sets of cylindrical lenses are configured to satisfy the above conditions.
- a short focal high NA cylindrical lens FAC lens
- a long focal low NA cylindrical lens SAC lens
- a double-sided wrench mirror is provided at the exit pupil position of the SAC lens, and the beam is expanded in the direction of the 10 mm width of the bar laser diode.
- the anisotropy of the light source size is large and a high-power bar laser is used.
- An optical system suitable for a diode can be obtained.
- the light emitted from the double-sided wrench is made almost parallel by a cylindrical Fresnel lens immediately before entering the light guide plate. This is to align the polarization plane of the laser.
- the refractive index of acrylic n l. 49 @ 640nm force, and the maximum NA of the lens is about 0.5.
- the radius of curvature of a double-sided wrench was obtained using the following equation [3]. Where f is the focal length, 1 is the distance between both surfaces, r is the radius of curvature, and n is the refractive index.
- the NA value is 0.
- Figure 8 shows the entire optical path diagram of the designed line diffuser optical system (a) and the light intensity distribution on the light guide plate entrance surface (b), center (c), and final surface (d).
- Double-sided wrench Kyura lens NA 0. 39, EFL 1. 22
- planar illumination device As described above, according to the planar illumination device according to the first embodiment of the present invention, wide color reproducibility and uniform luminance can be obtained by using laser light having high color purity and high emission efficiency. , And low power consumption can be realized.
- the second cylindrical lens 7 may be arranged between the first cylindrical lens 6 and the one-dimensional diffusing element 5 or between the one-dimensional diffusing element 5 and the light source 30. Absent . In this way, since the second cylindrical lens 7 can be disposed in a place where the width of the laser beam is narrow, the second cylindrical lens 7 can be downsized.
- the light source 30 capable of emitting the necessary light emission amount with a small size of the light guide plate 9 is small enough to be mounted on the main surface of the light guide plate 9! /.
- the size of the light guide plate 9 for a large-screen LCD TV for example, increases, the size of the light source 30 that can emit the required amount of light emission increases, and the light source on the main surface of the light guide plate 9 increases.
- FIG. 9 is a perspective view showing a configuration of a planar illumination device according to the second embodiment of the present invention.
- the planar illumination device according to the second embodiment shown in FIG. 9 includes a light source 1, an optical fiber 2, a polarization separator 3, mirrors 4a and 4b, one-dimensional diffusing elements 5a and 5b, and a first Cylindrical lenses 6a and 6b, second cylindrical lenses 7a and 7b, a mirror 8, a light guide plate 9, and a reflecting plate 10 are provided.
- a reflective plate 10 is bonded on one main surface of the light guide plate 9, a reflective plate 10 is bonded.
- the light source 1 and the polarization separation unit 3 are connected by an optical fiber 2.
- the polarization separation unit 3, the mirrors 4a and 4b, the one-dimensional diffusing elements 5a and 5b, the first cylindrical lenses 6a and 6b, and the second cylindrical lenses 7a and 7b are mounted on the reflecting plate 10.
- the laser light emitted from the light source 1 is separated into two directions by the polarization separation unit 3, and one of the laser lights is converted into a mirror 4a, a one-dimensional diffusion element 5a, a first cylindrical lens 6a, and a second cylindrical lens.
- the other laser beam passes through the lens 7a, and the mirror 4b, the one-dimensional diffusion element 5b, the first cylindrical lens 6b, and the second In this structure, the light beam is guided to the light guide plate 9 after being turned 180 degrees by the mirror 8 through the cylindrical lens 7b.
- the light source 1 is a laser light source that emits laser beams of three primary colors, and is configured as shown in FIG. 10, for example.
- the light source 30 includes a blue laser light source 12, a red laser light source 13, a green laser light source 14, dichroic mirrors 15 and 16, and a lens 17.
- the dichroic mirror 15 transmits blue light and reflects red light.
- the dichroic mirror 16 transmits blue light and red light and reflects green light.
- the blue laser light emitted from the blue laser light source 12 passes through the dichroic mirrors 15 and 16, is collected by the lens 17, and is guided to the optical fiber 2.
- the red laser light emitted from the red laser light source 13 is reflected by the dichroic mirror 15 and transmitted through the dichroic mirror 16, and then condensed by the lens 17 and guided to the optical fiber 2.
- the green laser light emitted from the green laser light source 14 is reflected by the dichroic mirror 16, collected by the lens 17, and guided to the optical fiber 2.
- Each color laser beam guided to the optical fiber 2 is transmitted to the polarization separation unit 3.
- the polarization separation unit 3 has a role of aligning the polarization surfaces of the laser light that is random while passing through the optical fiber 2.
- FIG. 11 is a diagram illustrating a detailed configuration example of the polarization separation unit 3.
- a polarization separation unit 3 shown in FIG. 11 includes a lens 18, a polarization beam splitter 19, a prism 20, and a half-wave plate 21.
- Each color laser beam emitted from the optical fiber 2 is irradiated onto the lens 18 and converted into parallel light.
- the polarization beam splitter 19 separates the laser light that has been collimated by the lens 18 into a P-polarized component and an S-polarized component. S-polarized light is reflected to become laser light 23 (first output light). P-polarized light passes through the polarization beam splitter 19 and is then reflected by the prism 20 to become laser light 22 (second output light).
- the plane of polarization of the laser beam 22 is rotated by the half-wave plate 21 and becomes the same S-polarized light as the laser beam 23. Therefore, laser light having a uniform polarization plane is emitted from the polarization separation unit 3 in two directions.
- the half-wave plate 21 is provided in the optical path of the laser beam 23, the polarization plane of the laser beam 23 can be aligned with the polarization plane of the laser beam 22 (P-polarized light).
- Half wavelength The case where the plate 21 is a broadband half-wave plate having a half wavelength over the red * green * blue wavelength has been described. However, after the laser beam exits the prism 20, the optical path is separated for each color. Of course, it is also possible to use a half-wave plate optimal for color.
- the laser beams of the same polarization plane emitted in two directions from the polarization separation unit 3 are reflected by the mirrors 4a and 4b and are incident on the one-dimensional diffusion elements 5a and 5b, respectively.
- the one-dimensional diffusing elements 5a and 5b are composed of holograms or lens arrays, and diffuse the laser light reflected by the mirrors 4a and 4b in the one-dimensional direction at an angle ⁇ ′.
- the one-dimensional diffusing elements 5a and 5b have the same configuration as the one-dimensional diffusing element 5 described in the first embodiment, and the surface for diffusing the laser light is parallel to the main surface of the light guide plate 9. It is designed to be
- the angle ⁇ ′ at which the one-dimensional diffusing elements 5a and 5b diffuse the laser light is basically 1 ⁇ 2 of the angle ⁇ at which the one-dimensional diffusing element 5 diffuses the laser light.
- the first cylindrical lenses 6a and 6b convert the laser beams having the polarization planes diffused by the one-dimensional diffusing elements 5a and 5b at an angle ⁇ 'into parallel lights, respectively.
- the second cylindrical lenses 7 a and 7 b converge the laser light converted into parallel light by the first cylindrical lenses 6 a and 6 b in the thickness direction of the light guide plate 9.
- the mirror 8 is a reflector having an L-shaped cross section, and the laser light focused in the thickness direction of the light guide plate 9 by the second cylindrical lenses 7a and 7b is reflected twice at right angles and emitted to the light guide plate 9 respectively. .
- the laser light incident on the light guide plate 9 is emitted from the main surface of the light guide plate 9 while traveling inside the light guide plate 9 while repeating multiple reflection or scattering.
- the first cylindrical lenses 6a and 6b, the second cylindrical lenses 7a and 7b, the mirror 8 and the light guide plate 9 are the same as the first cylindrical lens 6 and the second cylindrical lens described in the first embodiment.
- the cylindrical lens 7, the mirror 8, and the light guide plate 9 have basically the same functions.
- the light source 1 cannot be mounted on the main surface of the light guide plate 9, and the optical fiber 2 must be used.
- the polarization separation section 3 aligns the polarization plane of the laser light.
- the second cylindrical lenses 7a and 7b are polarized between the first cylindrical lenses 6a and 6b and the one-dimensional diffusion elements 5a and 5b, or polarized with the one-dimensional diffusion elements 5a and 5b. You may arrange
- FIG. 12 is a perspective view showing a configuration of a planar illumination device according to the third embodiment of the present invention.
- the planar illumination device according to the third embodiment shown in FIG. 12 includes a light source 30, a one-dimensional diffusion element 40, a cylindrical lens 6, a mirror 8, a light guide plate 9, and a reflection plate 10.
- the one-dimensional diffusion element 5 of the planar illumination device according to the first embodiment is replaced with the one-dimensional diffusion element 40, and the second cylindrical lens is used. 7 is omitted.
- the configuration of the planar illumination device according to the third embodiment other than the one-dimensional diffusing element 40 is the same as that of the planar illumination device according to the first embodiment, and thus the description thereof is omitted.
- FIG. 13 is a top view (al) and (a2), a front view (b), and a side view (c) showing a configuration example of the one-dimensional diffusion element 40.
- a one-dimensional diffusing element 40 shown in FIG. 13 includes a large number of cylindrical lenses 41 having curved surfaces on one side (al) or both sides (a2) in the X direction in the figure. This structure has a cylindrical surface with a curved surface in the Y direction in the figure.
- the laser light emitted from the light source 30 is parallel to the light guide plate 9 1. It can be converted into a laser beam that diffuses light in the dimensional direction and converges in the direction perpendicular to the diffusion direction. Therefore, even if the second cylindrical lens 7 is omitted, the laser light can be efficiently incident on the light guide plate 9.
- FIG. 14 is a perspective view showing a configuration of a planar illumination device according to the fourth embodiment of the present invention.
- a planar illumination device according to the fourth embodiment shown in FIG. 14 includes a light source 30, a one-dimensional diffusing element 5, a first cylindrical lens 6, a second cylindrical lens 7, a mirror 80, and a light guide.
- a plate 9 and a reflector 10 are provided.
- the fourth embodiment is a case where the light source 30, the one-dimensional diffusing element 5, the first cylindrical lens 6, and the second cylindrical lens 7 are not mounted on the main surface of the light guide plate 9. This is an example of the structure.
- a flat mirror 80 for making incident on the side surface may be installed at an appropriate angle.
- FIG. 15 is a perspective view showing a configuration of a planar illumination device according to the fifth embodiment of the present invention.
- a planar illumination device according to the fifth embodiment shown in FIG. 15 includes a light source 30 and a one-dimensional diffusion element.
- the light source 30, the one-dimensional diffusing element 5, the first cylindrical lens 6, and the second cylindrical lens 7 are not mounted on the main surface of the light guide plate 9.
- An example of the structure when each component is arranged in parallel with the main surface of the light guide plate 9 will be described.
- each component when each component is arranged outside the light guide plate 9 in parallel with the main surface of the light guide plate 9, the second cylindrical without using the mirror 80.
- the laser beam emitted from the lens 7 may be directly incident on the side surface of the light guide plate 9.
- FIG. 16 is a diagram illustrating a configuration example of a liquid crystal display device.
- This liquid crystal display device has a configuration in which a monitor unit 42 and a control box 44 are connected with a force S and a connection cable 43.
- FIG. 17 is a diagram illustrating a detailed configuration example of the monitor unit 42 of FIG.
- the monitor unit 42 includes the planar illumination device 45 according to the second embodiment, a liquid crystal panel 46, and an image display circuit 47.
- the image display circuit 47 is connected to the liquid crystal panel 46 by wiring 48, and drives the liquid crystal panel 46 to display an image.
- the control box 44 includes at least a power source and a light source, and supplies power and light to the monitor unit 42 via the connection cable 43.
- the light power supplied from the control box illuminates the liquid crystal panel 46 via the surface illumination device 45 and the image display circuit 47 drives the liquid crystal panel 46 to display an image.
- the image display circuit 47 drives the liquid crystal panel 46 to display an image.
- planar illumination device of the present invention can be used for a liquid crystal display device and the like, particularly when it is desired to realize a wide color reproducibility, uniform luminance, and low power consumption while ensuring a thin and large area. Useful for.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
- Liquid Crystal (AREA)
- Optical Elements Other Than Lenses (AREA)
- Semiconductor Lasers (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2007800367447A CN101523110B (zh) | 2006-10-02 | 2007-09-25 | 面状照明装置及使用此装置的液晶显示装置 |
JP2008537478A JP4920691B2 (ja) | 2006-10-02 | 2007-09-25 | 面状照明装置とそれを用いた液晶表示装置 |
US12/443,881 US8029179B2 (en) | 2006-10-02 | 2007-09-25 | Planar illumination apparatus and liquid crystal display apparatus using the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006270385 | 2006-10-02 | ||
JP2006-270385 | 2006-10-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008041559A1 true WO2008041559A1 (fr) | 2008-04-10 |
Family
ID=39268421
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/068568 WO2008041559A1 (fr) | 2006-10-02 | 2007-09-25 | Système d'éclairage à panneau plat et dispositif d'affichage à cristaux liquides utilisant celui-ci |
Country Status (4)
Country | Link |
---|---|
US (1) | US8029179B2 (ja) |
JP (1) | JP4920691B2 (ja) |
CN (1) | CN101523110B (ja) |
WO (1) | WO2008041559A1 (ja) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010116727A1 (ja) * | 2009-04-10 | 2010-10-14 | パナソニック株式会社 | 画像表示装置 |
WO2012111283A1 (ja) * | 2011-02-15 | 2012-08-23 | 三菱電機株式会社 | 面光源装置及び液晶表示装置 |
JP2017168253A (ja) * | 2016-03-15 | 2017-09-21 | 株式会社ジャパンディスプレイ | 照明装置及び表示装置 |
JP2017220418A (ja) * | 2016-06-10 | 2017-12-14 | 株式会社ジャパンディスプレイ | 照明装置及び表示装置 |
JP2018045778A (ja) * | 2016-09-12 | 2018-03-22 | 株式会社ジャパンディスプレイ | 照明装置 |
WO2020194850A1 (ja) * | 2019-03-26 | 2020-10-01 | 日立化成株式会社 | スペックルノイズ低減光学系 |
JPWO2019182073A1 (ja) * | 2018-03-20 | 2021-04-08 | Agc株式会社 | ホモジェナイザ、照明光学系および照明装置 |
JP2021529973A (ja) * | 2018-07-17 | 2021-11-04 | トルンプ フォトニック コンポーネンツ ゲゼルシャフト ミット ベシュレンクテル ハフツング | 構造高さを低くしたレーザー装置 |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5149200B2 (ja) * | 2006-12-26 | 2013-02-20 | パナソニック株式会社 | 面状照明装置とそれを用いた液晶表示装置 |
CN101714741B (zh) * | 2009-11-25 | 2011-03-16 | 山东大学 | 一种侧向发光的激光柱光源 |
JP6042051B2 (ja) * | 2010-11-26 | 2016-12-14 | 大日本印刷株式会社 | 面照明装置およびバックライト装置 |
JP5736746B2 (ja) * | 2010-11-26 | 2015-06-17 | 大日本印刷株式会社 | 露光装置 |
EP3211299A1 (en) * | 2012-10-24 | 2017-08-30 | SeeReal Technologies S.A. | Illumination device |
DE102013002399B4 (de) * | 2013-02-13 | 2016-12-22 | Chromasens Gmbh | Vorrichtung zur Generierung von Lichtmustern mit einer eindimensional fokussierten Beleuchtungseinrichtung |
TWI564626B (zh) * | 2013-04-30 | 2017-01-01 | 鴻海精密工業股份有限公司 | 光源模組 |
CN104565995A (zh) * | 2013-10-22 | 2015-04-29 | 鸿富锦精密工业(深圳)有限公司 | 背光模组 |
CN105116616A (zh) * | 2015-10-08 | 2015-12-02 | 杭州虹视科技有限公司 | 液晶背光装置 |
JP6855698B2 (ja) * | 2016-07-28 | 2021-04-07 | 凸版印刷株式会社 | 光源装置及びそれを備えた表示装置 |
KR102399100B1 (ko) * | 2017-06-16 | 2022-05-18 | 삼성디스플레이 주식회사 | 백라이트 유닛 및 이를 포함하는 표시 장치 |
US11137246B2 (en) * | 2019-01-31 | 2021-10-05 | Himax Technologies Limited | Optical device |
EP3932664A1 (en) * | 2020-06-30 | 2022-01-05 | Corning Incorporated | Light guide plate and transparent illumination system utilizing the same |
CN113534465A (zh) * | 2021-07-08 | 2021-10-22 | 合肥疆程技术有限公司 | 一种背光***、车载抬头显示器和车辆 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09307174A (ja) * | 1996-05-15 | 1997-11-28 | Ricoh Co Ltd | 分散光源装置 |
JP2005332719A (ja) * | 2004-05-20 | 2005-12-02 | Mitsubishi Electric Corp | 面状光源装置および該面状光源装置を備えた表示装置 |
JP2006073202A (ja) * | 2004-08-31 | 2006-03-16 | Nichia Chem Ind Ltd | 発光装置 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06267314A (ja) * | 1993-03-11 | 1994-09-22 | Nissan Motor Co Ltd | 照明装置 |
JPH11271767A (ja) | 1998-03-20 | 1999-10-08 | Stanley Electric Co Ltd | 照明付液晶表示装置 |
JP2000268622A (ja) * | 1999-03-16 | 2000-09-29 | Minebea Co Ltd | 面状照明装置 |
TWI235270B (en) * | 1999-07-02 | 2005-07-01 | Keun-Chang Yang | Plane light source unit and method for manufacturing holographic light-guide plate used for flat panel display |
US7859610B2 (en) * | 2005-12-27 | 2010-12-28 | Panasonic Corporation | Planar lighting and LCD device with a laser light source emitting a linearly-polarized laser beam, optical member to parallelize the beam and a plate-shaped light guide for emitting part of the beam |
US8317386B2 (en) * | 2006-07-24 | 2012-11-27 | Panasonic Corporation | Laser-lit planar illumination device and LCD using such device |
KR20080020312A (ko) * | 2006-08-31 | 2008-03-05 | 삼성전자주식회사 | 자발광 액정 표시 장치 |
US7918600B2 (en) * | 2007-08-09 | 2011-04-05 | Panasonic Corporation | Planar illumination device and liquid crystal display device using the same |
-
2007
- 2007-09-25 WO PCT/JP2007/068568 patent/WO2008041559A1/ja active Application Filing
- 2007-09-25 US US12/443,881 patent/US8029179B2/en not_active Expired - Fee Related
- 2007-09-25 CN CN2007800367447A patent/CN101523110B/zh not_active Expired - Fee Related
- 2007-09-25 JP JP2008537478A patent/JP4920691B2/ja not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09307174A (ja) * | 1996-05-15 | 1997-11-28 | Ricoh Co Ltd | 分散光源装置 |
JP2005332719A (ja) * | 2004-05-20 | 2005-12-02 | Mitsubishi Electric Corp | 面状光源装置および該面状光源装置を備えた表示装置 |
JP2006073202A (ja) * | 2004-08-31 | 2006-03-16 | Nichia Chem Ind Ltd | 発光装置 |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010116727A1 (ja) * | 2009-04-10 | 2010-10-14 | パナソニック株式会社 | 画像表示装置 |
JP5624475B2 (ja) * | 2009-04-10 | 2014-11-12 | パナソニック株式会社 | 画像表示装置 |
US8955980B2 (en) | 2009-04-10 | 2015-02-17 | Panasonic Corporation | Image display apparatus which reduces speckle noise and which operates with low power consumption |
WO2012111283A1 (ja) * | 2011-02-15 | 2012-08-23 | 三菱電機株式会社 | 面光源装置及び液晶表示装置 |
US9103950B2 (en) | 2011-02-15 | 2015-08-11 | Mitsubishi Electric Corporation | Surface light source device and liquid crystal display device |
JP2017168253A (ja) * | 2016-03-15 | 2017-09-21 | 株式会社ジャパンディスプレイ | 照明装置及び表示装置 |
JP2017220418A (ja) * | 2016-06-10 | 2017-12-14 | 株式会社ジャパンディスプレイ | 照明装置及び表示装置 |
JP2018045778A (ja) * | 2016-09-12 | 2018-03-22 | 株式会社ジャパンディスプレイ | 照明装置 |
JPWO2019182073A1 (ja) * | 2018-03-20 | 2021-04-08 | Agc株式会社 | ホモジェナイザ、照明光学系および照明装置 |
JP2021529973A (ja) * | 2018-07-17 | 2021-11-04 | トルンプ フォトニック コンポーネンツ ゲゼルシャフト ミット ベシュレンクテル ハフツング | 構造高さを低くしたレーザー装置 |
JP7198341B2 (ja) | 2018-07-17 | 2022-12-28 | トルンプ・フォトニック・コンポウネンツ・ゲゼルシャフト・ミット・ベシュレンクター・ハフトゥング | 構造高さを低くしたレーザー装置 |
WO2020194850A1 (ja) * | 2019-03-26 | 2020-10-01 | 日立化成株式会社 | スペックルノイズ低減光学系 |
Also Published As
Publication number | Publication date |
---|---|
CN101523110B (zh) | 2011-01-12 |
JP4920691B2 (ja) | 2012-04-18 |
US8029179B2 (en) | 2011-10-04 |
US20100045894A1 (en) | 2010-02-25 |
CN101523110A (zh) | 2009-09-02 |
JPWO2008041559A1 (ja) | 2010-02-04 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4920691B2 (ja) | 面状照明装置とそれを用いた液晶表示装置 | |
JP4776285B2 (ja) | 照明光学装置及びこれを用いた虚像表示装置 | |
US7859610B2 (en) | Planar lighting and LCD device with a laser light source emitting a linearly-polarized laser beam, optical member to parallelize the beam and a plate-shaped light guide for emitting part of the beam | |
JP3298437B2 (ja) | 光学素子、偏光照明装置および投写型表示装置 | |
JP5015162B2 (ja) | 面状照明装置及びそれを用いた液晶表示装置 | |
JP5017817B2 (ja) | 虚像光学装置 | |
KR100456492B1 (ko) | Lcd프로젝터용편광조명시스템 | |
JP5254205B2 (ja) | 光走査装置及びそれを用いた二次元画像表示装置 | |
JP2006505830A (ja) | プロジェクタシステムのための照明装置 | |
JP5107341B2 (ja) | 面状照明装置およびそれを用いた液晶表示装置 | |
JP2009512883A (ja) | レーザ・スペックルを低減する方法および装置 | |
JP2010541001A (ja) | マイクロプロジェクタ | |
JPWO2008078543A1 (ja) | 面状照明装置とそれを用いた液晶表示装置 | |
WO2007094304A1 (ja) | 光源装置、及びその光源装置を用いた液晶ディスプレイ装置 | |
TW202125038A (zh) | 用於頭戴式顯示器的緊湊型投影儀 | |
JP4984452B2 (ja) | 空間光変調光学装置とこれを用いた虚像表示装置及び投射型画像表示装置 | |
WO2019107044A1 (ja) | 虚像投射装置 | |
TWM623587U (zh) | 光學系統 | |
US10732442B2 (en) | Optical device | |
JP2010101989A (ja) | ディスプレイ装置 | |
JP2008070769A (ja) | 光源ユニット、照明装置およびプロジェクタ装置 | |
US20090021829A1 (en) | Optical module | |
US20210215315A1 (en) | Optical Apparatus and Illuminating Module Thereof | |
WO2011162321A1 (ja) | 照明装置及びプロジェクタ | |
KR100352973B1 (ko) | 2 램프를 이용한 액정 프로젝터의 광학계 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200780036744.7 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 07807840 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2008537478 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 12443881 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 07807840 Country of ref document: EP Kind code of ref document: A1 |