WO2011080955A1 - 面状照明装置およびそれを備えた表示装置 - Google Patents
面状照明装置およびそれを備えた表示装置 Download PDFInfo
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- WO2011080955A1 WO2011080955A1 PCT/JP2010/067244 JP2010067244W WO2011080955A1 WO 2011080955 A1 WO2011080955 A1 WO 2011080955A1 JP 2010067244 W JP2010067244 W JP 2010067244W WO 2011080955 A1 WO2011080955 A1 WO 2011080955A1
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- light
- guide plate
- polarizing plate
- illumination device
- optical sheet
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- 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
- G02F1/133509—Filters, e.g. light shielding masks
- G02F1/133512—Light shielding layers, e.g. black matrix
-
- 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
- G02B6/0056—Means for improving the coupling-out of light from the light guide for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements
-
- 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
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
- G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
-
- 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
- G02F1/133528—Polarisers
- G02F1/133536—Reflective polarizers
-
- 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
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
-
- 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
-
- 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
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0051—Diffusing 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
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
Definitions
- the present invention relates to a planar illumination device, and more particularly to a planar illumination device used for a backlight of a liquid crystal display device.
- a backlight device called an edge light type or a side light type is known as one of backlight devices used in liquid crystal display devices.
- an LED light emitting diode
- CCFL cold cathode tube
- a light emitter is disposed, and surface light emission toward the liquid crystal panel is performed based on light emitted from the light emitter and incident on the light guide plate.
- FIG. 13 is a cross-sectional view showing the configuration of one end of a conventional edge light type backlight device.
- the backlight device includes an LED 40, a chassis (hereinafter referred to as “side chassis”) 51 that supports a substrate (not shown) on which the LED 40 is mounted, and a light emitted from the LED 40 toward the liquid crystal panel.
- a chassis (hereinafter referred to as “upper surface side chassis”) 52 disposed on the optical sheet 80.
- the optical sheet 80 is disposed on the light emitting surface side of the light guide plate 20
- the reflection sheet 30 is disposed on the back surface side of the light guide plate 20.
- the optical sheet 80 includes a reflective polarizing plate 81, a prism sheet 82, and a diffusion sheet 83.
- the diffusion sheet 83 diffuses light to make it uniform.
- the prism sheet 82 condenses light so that a component in a direction perpendicular to the liquid crystal panel increases.
- the reflective polarizing plate 81 transmits some light (for example, linearly polarized light that vibrates in a specific direction) and reflects the remaining light (for example, linearly polarized light that vibrates in a direction perpendicular to the specific direction). To do.
- the light transmitted through the reflective polarizing plate 81 is incident on the polarizing plate on the backlight device side among the polarizing plates provided on both surfaces of the liquid crystal panel.
- the light emitted from the LED 40 is incident on the light guide plate 20 directly or after being reflected by the reflection sheet 30.
- the light incident on the light guide plate 20 propagates while reflecting in the light guide plate 20 and is emitted to the light emitting surface side through the optical sheet 80.
- the optical sheet 80 is shorter than the light guide plate 20 in the left-right direction of FIG. 13 (the end of the optical sheet 80 is the end surface of the upper surface side chassis 52 and the end surface (end portion) of the light guide plate 20).
- the length of the optical sheet 80 and the length of the light guide plate 20 are equal, the light emitted from the LED 40 in the direction of the arrow indicated by reference numeral 71 is as indicated by the arrow indicated by reference numeral 72.
- the optical sheet 80 is made shorter than the light guide plate 20 as shown in FIG. 13 so that such light is absorbed by the upper surface side chassis 52.
- FIG. 15 is a cross-sectional view showing the configuration of one end of a conventional edge light type backlight device having a narrow frame.
- the distance L 9 in the configuration shown in FIG. It is shorter than the distance L8 in the illustrated configuration.
- the distance L9 is about 5 mm.
- the distance between the center side end face of the upper surface side chassis 52 and the end face of the light guide plate 20 is shortened, so that unlike the configuration shown in FIG.
- the length of the sheet 90 is equal to the length of the light guide plate 20.
- the reason for this is as follows.
- the optical sheet 90 expands due to heat as the LED 40 emits light.
- the size of the optical sheet 90 is designed in consideration of a certain degree of tolerance. Accordingly, the optical sheet 90 is not fixed in the chassis, but moves (displaces) within a tolerance range. Under such a premise, if the distance from the center side end surface of the upper surface side chassis 52 to the end of the optical sheet 90 is shortened as shown in FIG.
- the optical sheet 90 is positioned from the position corresponding to the center side end surface of the upper surface side chassis 52 on the optical sheet 90 so that the optical sheet 90 is held in the chassis.
- the distance to the end of 90 is determined so that the length (covering the optical sheet 90) covered by the upper surface side chassis 52 is sufficient.
- the length of the optical sheet 90 is equal to the length of the light guide plate 20.
- Japanese Patent Application Laid-Open No. 2004-71167 discloses a bright line or display due to light leakage by sticking a light-shielding tape to all or part of the edge of the light-emitting surface side of the light guide plate.
- An invention of a planar light source device that suppresses the occurrence of unevenness is disclosed.
- the black printing 60 when the black printing 60 is applied to a part of the optical sheet 90 as shown in FIG. 18, the light propagating through the light guide plate 20 is essentially as indicated by the arrow 75 in FIG. 19A. 19B, it is absorbed by the black printing 60 as indicated by the arrow 76 in FIG. For this reason, although generation
- the periphery of the light source is covered with a reflecting structure (lamp reflector), the efficiency of light incident on the light guide plate is increased.
- a reflecting structure lamp reflector
- the reflective structure becomes thin (for example, about 500 ⁇ m)
- the optical sheet is expanded by heat, there is no space in which the optical sheet can be stretched, so that the optical sheet bends.
- an object of the present invention is to realize a narrow frame while suppressing the occurrence of light leakage and a decrease in luminance in an edge light type backlight device.
- a first aspect of the present invention includes a plurality of light sources, a light guide plate for emitting light emitted from the light sources in a planar shape, a plurality of optical sheets disposed on a light emitting surface side of the light guide plate, A planar illumination device comprising a reflective sheet disposed on the side opposite to the light emitting surface side of the light guide plate with respect to the position of the light guide plate, A chassis for fixing the plurality of optical sheets; At least one optical sheet of the plurality of optical sheets is provided with a light shielding portion in a part of a region corresponding to a non-light emitting region of the planar illumination device, The optical sheet disposed at a position farthest from the light guide plate among the plurality of optical sheets is a reflective polarizing plate that transmits a part of light and reflects the remaining light, About the 1st direction which is a direction perpendicular
- the distance between the end of the light guide plate and the end of the reflective polarizing plate is the distance between the end of the light guide plate and the surface of the chassis on which the light source is provided. It is characterized in that it is at least one third.
- the distance between the end of the light guide plate and the end of the reflective polarizing plate is at least 1 millimeter.
- the light shielding portion is a region from a position corresponding to an end portion of the light emitting region of the planar illumination device on the optical sheet to an end portion of the optical sheet other than the reflective polarizing plate. In at least one third of the area.
- the light shielding portion is formed by black printing on the optical sheet.
- the portion of the chassis that is disposed closer to the light emitting surface than the optical sheet is black.
- a seventh aspect of the present invention is the sixth aspect of the present invention,
- the thickness of the portion of the chassis that is disposed closer to the light emitting surface than the optical sheet is 1.5 mm or less.
- the reflective polarizing plate is composed of a plurality of thin films having different refractive indexes, transmits linearly polarized light that vibrates in a specific direction, and reflects linearly polarized light that vibrates in a direction perpendicular to the specific direction. It is characterized by.
- the reflective polarizing plate is composed of a cholesteric liquid crystal layer and a retardation plate,
- the cholesteric liquid crystal layer transmits circularly polarized light that rotates in a specific direction, reflects circularly polarized light that rotates in a direction different from the specific direction,
- the retardation plate is characterized in that circularly polarized light transmitted through the cholesteric liquid crystal layer is converted into linearly polarized light.
- the reflective polarizing plate is constituted by a base material on which a plurality of fine metal wires are formed, and transmits light having a wavelength greater than the interval between the fine metal wires and a component having an electric field vector perpendicular to the fine metal wires.
- the method has a feature of reflecting a component having an electric field vector parallel to the thin metal wire.
- An eleventh aspect of the present invention is a display device, It further includes a display panel, and is provided with the planar illumination device according to the first aspect of the present invention.
- the end portion of the reflective polarizing plate protrudes beyond the end portion of the light guide plate in the direction between the one surface (of the chassis) where the light source is provided (the chassis) and the facing surface. It has a configuration. For this reason, according to the conventional configuration, a part of the light absorbed by the chassis above the light source is reflected by the reflective polarizing plate and is incident on the light guide plate. Thereby, the utilization efficiency of the light emitted from the light source is increased, and the luminance is improved. Moreover, about the optical sheet, the light-shielding part is provided in a part of area
- the light emitted from the light source and incident on the optical sheet without entering the light guide plate is absorbed by the light shielding unit. Thereby, the occurrence of light leakage near the boundary between the light emitting region and the non-light emitting region is suppressed.
- a narrow frame of the backlight device can be realized while suppressing occurrence of light leakage and luminance reduction.
- the light absorbed by the chassis above the light source in the conventional configuration is more efficiently reflected by the reflective polarizing plate and incident on the light guide plate.
- a narrow frame of the backlight device is realized while effectively suppressing a decrease in luminance.
- a narrow frame of the backlight device is realized while effectively suppressing a decrease in luminance.
- light that causes light leakage in the vicinity of the boundary between the light emitting region and the non-light emitting region is more effectively absorbed by the light shielding unit.
- the narrow frame of the backlight device is realized while effectively suppressing the occurrence of light leakage.
- the occurrence of light leakage in the vicinity of the boundary between the light emitting region and the non-light emitting region can be suppressed with a relatively simple configuration.
- the sixth aspect of the present invention since black hardly transmits light, occurrence of light leakage from the chassis portion is suppressed. Thereby, the deterioration of the display quality resulting from light leakage is suppressed.
- the same effect as in the sixth aspect of the present invention can be obtained in the thinned backlight device.
- the same effect as that of the first aspect of the present invention can be obtained in the planar illumination device having the configuration using the reflective polarizing plate realized by the thin film lamination method.
- the same effect as that of the first aspect of the present invention can be obtained in the planar illumination device having the configuration using the reflective polarizing plate realized by the cholesteric liquid crystal method.
- the same effect as that of the first aspect of the present invention can be obtained in the planar illumination device having the configuration using the reflective polarizing plate realized by the wire grid method.
- the display device is provided with the planar illumination device according to the first aspect of the present invention.
- the narrow frame of the display device is realized while suppressing the occurrence of light leakage and the decrease in luminance.
- a and B are diagrams for explaining the effects obtained by the reflective polarizing plate in the embodiment.
- it is a graph which shows the relationship between the protrusion amount of a reflective polarizing plate from the end surface of a light-guide plate, and a brightness
- it is a graph which shows the relationship between the width
- it is a graph which shows the brightness
- it is a graph which shows the brightness
- it is a graph which shows the brightness
- FIGS. 19A and 19B are diagrams for explaining the cause of a decrease in luminance in the backlight device having the configuration shown in FIG.
- FIG. 2 is an exploded perspective view of an edge light type backlight device according to an embodiment of the present invention.
- FIG. 1 is a cross-sectional view of the backlight device as viewed from the direction of the arrow 9 in FIG.
- the backlight device includes a plurality of LEDs 40 as light sources (light emitters), a chassis 50, a light guide plate 20 for emitting light emitted from the LEDs 40 toward the liquid crystal panel, and a light guide plate 20. It is comprised by the reflection sheet 30 for reflecting the light which goes to a back surface inside, and the optical sheet 10 for improving the efficiency of the light irradiated toward a liquid crystal panel.
- the LEDs 40 are mounted on a substrate at a pitch (interval) of 10 mm, for example, and the substrate is fixed to one side 58 of the chassis 50 and its opposite side 59 as shown in FIG.
- Each LED 40 is arranged so that there is a light emission peak in the right direction in FIG.
- the chassis 50 includes a side chassis 51 that supports a substrate on which the LEDs 40 are mounted, and an upper chassis 52 that is disposed on the optical sheet 10.
- the optical sheet 10 includes a reflective polarizing plate 11, a prism sheet 12, and a diffusion sheet 13.
- black printing 60 is applied to a part of the front or back surface of the diffusion sheet 13 in the optical sheet 10 as shown in FIG.
- the black print 60 functions as a light shielding portion.
- the reflective polarizing plate 11 has a configuration different from that of the conventional backlight device. Specifically, in the left-right direction (first direction) in FIG. 1, the reflective polarizing plate 11 is longer than the light guide plate 20, and the end portion of the reflective polarizing plate 11 is the end face (end portion) of the light guide plate 20. It is located on the LED 40 side (side surface side chassis 51 side). In the following, the distance from the end face of the light guide plate 20 to the end of the reflective polarizing plate 11 is referred to as “the amount of protrusion” and is denoted by reference symbol L2 (see FIG. 1).
- distance L1 5 mm between the center side end surface of the upper surface side chassis 52 and the end surface of the light guide plate 20.
- the amount of protrusion L2 is 1 mm.
- Distance L3 between the end surface of the light guide plate 20 and the side chassis 51 3 mm.
- Distance L4 between the end face of the light guide plate 20 and the tip of the LED 40 1.6 mm.
- Black print 60 width L5 3 mm.
- FIG. 3 is a cross-sectional view showing a configuration of one end of a liquid crystal display device including the backlight device.
- the backlight device is fixed to the chassis 2 of the liquid crystal display device.
- the liquid crystal panel 3 is disposed on the side opposite to the light guide plate 20 with respect to the position of the optical sheet 10.
- the active area of the liquid crystal panel 3 (display area where an image is actually displayed) is narrower than the active area of the backlight device (area where light can be irradiated).
- the distance L6 from the end of the active area of the liquid crystal panel 3 to the end of the active area of the backlight device is 2 mm.
- a black matrix is formed in a region corresponding to the above L6 for one of the two glass substrates constituting the liquid crystal panel 3. For this reason, the said area
- the backlight device according to the present embodiment is typically employed as a backlight device for a large liquid crystal panel.
- a reflective polarizing plate 11 is employed for the optical sheet 10 that is disposed on the most liquid crystal panel side (the light emitting surface side in FIG. 1).
- the reflective polarizing plate 11 transmits part of light and reflects the remaining light.
- transmitted the reflective polarizing plate 11 injects into the polarizing plate by the side of the backlight apparatus among the polarizing plates provided in both surfaces of the liquid crystal panel.
- a reflective polarizing plate 11 in which a plurality of thin films having different refractive indexes are laminated is employed.
- linearly polarized light is generated by multistage reflection with the plurality of thin films.
- Examples of the reflective polarizing plate 11 include DBEF (Dual Brightness Enhancement Film) (“DBEF” is a registered trademark) manufactured by Sumitomo 3M Limited.
- DBEF Dual Brightness Enhancement Film
- the reflective polarizing plate 11 transmits only linearly polarized light (P wave) that vibrates in a specific direction, and reflects linearly polarized light (S wave) that vibrates in a direction perpendicular to the specific direction.
- the S wave reflected by the reflective polarizing plate 11 propagates through the light guide plate 20 and is reflected again by the reflection sheet 30 to be separated into a P wave and an S wave. In this way, light is reused, and the amount of light applied to the liquid crystal panel is increased.
- a method for realizing the reflective polarizing plate 11 employed in the present embodiment is referred to as a “thin film lamination method”.
- FIGS. 4A and 4B are diagrams for explaining the effects obtained by the reflective polarizing plate 11 in the present embodiment.
- reference numerals 5, 6, 300, 301, and 302 denote a P wave, an S wave, a liquid crystal layer, a polarizing plate on the back side of the liquid crystal panel, and a polarizing plate on the front side of the liquid crystal panel, respectively. Show. Further, optical sheets other than the reflective polarizing plate 11 are omitted. According to the configuration not including the reflective polarizing plate 11, as shown in FIG. 4A, among the P wave 5 and S wave 6 emitted from the light guide plate 20, the S wave 6 is a polarizing plate on the back side of the liquid crystal panel. Absorbed at 301.
- the S wave 6 reflected by the reflective polarizing plate 11 again becomes the P wave 5 and the S wave 6 from the light guide plate 20. Emitted.
- the P wave 5 is applied to the polarizing plate 301 on the back side of the liquid crystal panel, and the S wave 6 is reflected by the reflective polarizing plate 11 and reused.
- the thin film lamination type reflective polarizing plate 11 for the most liquid crystal panel side of the optical sheet 10, the light emitted from the light guide plate 20 is efficiently obtained. Is being used.
- FIG. 5 shows a 40-type liquid crystal panel (the distance L1 between the center side end surface of the upper surface side chassis 52 and the end surface of the light guide plate 20 is 5 mm, and the distance between the end surface of the light guide plate 20 and the side surface chassis 51 is It is a graph which shows the relationship (experimental result) of the protrusion amount L2 and brightness
- a thin solid line 61 is data when the black printing 60 is not performed on the optical sheet 10.
- a thick dotted line 62 is data when black printing 60 having a width of 3 mm is applied on the optical sheet 10.
- a thick solid line with reference numeral 63 is data when a black print 60 having a width of 5 mm is applied on the optical sheet 10. From FIG.
- FIG. 6 is a graph showing the relationship (experimental result) between the width of the black print 60 on the optical sheet 10 and light leakage.
- the horizontal axis represents the width of the black print 60
- the vertical axis represents the ratio (that is, the relative value) of the leakage light luminance to the luminance at the central portion of the liquid crystal panel. From FIG. 6, it is understood that when the width of the black print 60 is 3 mm, the light leakage is about one-half that when the black print 60 is not applied (the width of the black print 60 is 0 mm).
- the protruding amount L2 is 1 mm, and the width L5 of the black print 60 is 3 mm.
- the protruding amount L2 is preferably at least one third of the distance L3 between the end face of the light guide plate 20 and the side chassis 51.
- the width L5 of the black print 60 is at least a distance between a position (on the diffusion sheet 13) corresponding to the end of the active area (see FIG. 3) of the backlight device and the end of the diffusion sheet 13. One third is preferable.
- the upper surface side chassis 52 in the present embodiment will be described in detail.
- polycarbonate is used as the material, and the thickness is 1.0 mm to 1.5 mm.
- black is adopted as the color.
- the backlight device according to the present embodiment is typically used for a large liquid crystal panel.
- the backlight device is generally used for a small liquid crystal panel such as a mobile phone in which a white chassis is generally used. The reason why black is adopted as the color of the upper surface side chassis 52 in this embodiment will be described in comparison with the backlight device.
- a backlight device for a small liquid crystal panel an LED is mounted on an FPC (flexible printed circuit board) and a light guide plate is attached to the FPC. Therefore, even if the light guide plate is expanded by heat, the LED is not physically pressed by the light guide plate and the chassis. Moreover, in the backlight device for small liquid crystal panels, since the light guide plate is small compared to the device for large liquid crystal panels, the amount of expansion due to heat is small. For this reason, even if the light guide plate expands due to heat, the LED is not physically pressed by the light guide plate. Further, since the required luminance is lower than that of a device for a large liquid crystal panel, the amount of heat received by the light guide plate is also small.
- FPC flexible printed circuit board
- the distance between the LED and the light guide plate can be made substantially 0 mm, the occurrence of light leakage based on light emitted from the LED and not incident on the light guide plate is suppressed.
- the required brightness is low compared to devices for large liquid crystal panels, and a sufficient amount of light can be obtained with a small number of LEDs, so the impact on display quality even if light leakage occurs is compared. Small.
- the substrate on which the LED 40 is mounted is generally fixed to the side chassis 51, and the LED 40 and the light guide plate 20 are not integrated. For this reason, an air gap is provided between the LED 40 and the light guide plate 20 in consideration of thermal expansion of the light guide plate 20. Therefore, the amount of light that can cause light leakage is increased as compared with a backlight device for a small liquid crystal panel. Further, in a large liquid crystal panel, required luminance is high, and a large number of LEDs 40 are arranged in a chassis. For this reason, light leakage appears as a bright line, and the display quality is remarkably lowered.
- the white color when white is adopted as the color of the upper surface side chassis 52, the white color easily transmits light. Therefore, light leakage occurs unless the thickness of the upper surface side chassis 52 is considerably large.
- the backlight device for large liquid crystal panels in which the thickness of the upper surface side chassis 52 is relatively thin is also used. Deterioration of display quality due to light leakage is suppressed.
- the length of the reflective polarizing plate 11 is longer than the length of the light guide plate 20 in the direction between the LEDs facing each other. That is, as compared with the conventional configuration, the end portion of the reflective polarizing plate 11 protrudes to the LED 40 side from the end surface of the light guide plate 20. For this reason, according to the conventional configuration, a part of the light absorbed by the upper surface side chassis 52 is reflected by the reflective polarizing plate 11 and incident on the light guide plate 20 as indicated by an arrow 70 in FIG. The Thereby, the utilization efficiency of the light radiate
- the black printing 60 as the light shielding portion is applied to a partial region of the diffusion sheet 13 in the optical sheet 10. For this reason, the light emitted from the LED 40 and incident on the optical sheet 10 without being incident on the light guide plate 20 is absorbed by the black printing 60. Thereby, the occurrence of light leakage at the edge portion of the display area (near the active area end portion of the backlight device) is suppressed.
- the luminance is the position indicated by the reference symbol P1 in the graph shown in FIG. It becomes the value of.
- the luminance is a value at the position indicated by the symbol P2.
- a black chassis is adopted as the upper surface side chassis 52. If a white chassis is adopted as the upper surface side chassis 52, light leakage occurs depending on the thickness of the chassis (the light leakage amount increases as the chassis thickness decreases). In this regard, when a black chassis is employed as in the present embodiment, light is absorbed by the chassis, so that light leakage is effectively suppressed. Thereby, the deterioration of the display quality resulting from light leakage is suppressed.
- the thin film lamination type reflective polarizing plate 11 is employed, but the present invention is not limited to this.
- the reflection type polarizing plate 11 realized by the methods described below referred to as “cholesteric liquid crystal method” and “wire grid method” may be adopted.
- the cholesteric liquid crystal reflection type polarizing plate 11 is composed of a cholesteric liquid crystal layer 111 and a retardation plate 112. As shown in FIG. 11, among the cholesteric liquid crystal layer 111 and the retardation film 112, the cholesteric liquid crystal layer 111 is disposed on the liquid crystal panel 3 side, and the retardation film 112 is disposed on the light guide plate 20 side. In FIG. 11, optical sheets other than the reflective polarizing plate 11 are omitted. In such a configuration, the cholesteric liquid crystal layer 111 transmits circularly polarized light that rotates in a specific direction and reflects circularly polarized light that rotates in a direction different from the specific direction.
- the phase difference plate 112 converts the circularly polarized light transmitted through the cholesteric liquid crystal layer 111 into linearly polarized light. As described above, the light transmitted through the cholesteric liquid crystal layer 111 is given to the polarizing plate 301 on the back side of the liquid crystal panel 3, and the light reflected by the cholesteric liquid crystal layer 111 is reused.
- the reflective polarizing plate 11 by the wire grid method is configured by a base material (substrate) 113 on which a plurality of fine metal wires 114 are formed, as shown in FIG.
- the reflection-type polarizing plate 11 transmits a component having an electric field vector perpendicular to the metal thin wire 114 for light having a wavelength longer than the interval L7 where the plurality of metal thin wires 114 are formed.
- the component having the electric field vector parallel to 114 is reflected. Thereby, the light transmitted through the reflective polarizing plate 11 is given to the polarizing plate on the back side of the liquid crystal panel, and the light reflected by the reflective polarizing plate 11 is reused.
- the optical sheet 10 includes the reflective polarizing plate 11, the prism sheet 12, and the diffusion sheet 13.
- the present invention is not limited to this.
- the reflective polarizing plate 11 is disposed on the most liquid crystal panel side, the number and type of optical sheets are not particularly limited.
- the black printing 60 was given to the diffusion sheet 13
- this invention is not limited to this, The structure by which the black printing 60 was given to sheets other than the diffusion sheet 13 may be sufficient. .
- the light shielding portion is realized by performing the black printing 60 on the optical sheet 10, but the present invention is not limited to this.
- the light shielding part may be realized by sticking a black tape on the optical sheet 10, or the light shielding part is realized by painting a part of the optical sheet 10 in black with a marking pen. Also good.
Abstract
Description
前記複数の光学シートを固定するためのシャーシを有し、
前記複数の光学シートのうちの少なくとも1つの光学シートには、前記面状照明装置の非発光領域に相当する領域の一部に遮光部が設けられ、
前記複数の光学シートのうち前記導光板から最も離れた位置に配置されている光学シートは、一部の光を透過して残りの光を反射する反射型偏光板であって、
前記シャーシを形成する面のうち前記光源が設けられている面に対して垂直な方向である第1方向について、前記反射型偏光板の端部が前記導光板の端部よりも前記光源側に位置するように、前記反射型偏光板の長さが前記導光板の長さよりも長くされていることを特徴とする。
前記第1方向について、前記導光板の端部と前記反射型偏光板の端部との間の距離は、前記導光板の端部と前記光源が設けられているシャーシの面との間の距離の少なくとも3分の1にされていることを特徴とする。
前記第1方向について、前記導光板の端部と前記反射型偏光板の端部との間の距離は、少なくとも1ミリメートルにされていることを特徴とする。
前記遮光部は、前記第1方向について、前記光学シート上における前記面状照明装置の発光領域の端部に相当する位置から前記反射型偏光板以外の前記光学シートの端部までの領域のうちの少なくとも3分の1の領域に設けられていることを特徴とする。
前記遮光部は、前記光学シートに黒印刷が施されることによって形成されていることを特徴とする。
前記シャーシのうち前記光学シートよりも発光面側に配置されている部分は黒色であることを特徴とする。
前記シャーシのうち前記光学シートよりも発光面側に配置されている部分の厚さは1.5ミリメートル以下であることを特徴とする。
前記反射型偏光板は、互いに屈折率の異なる複数の薄膜によって構成され、特定の方向に振動する直線偏光を透過し、前記特定の方向に対して垂直な方向に振動する直線偏光を反射することを特徴とする。
前記反射型偏光板は、コレステリック液晶層と位相差板とによって構成され、
前記コレステリック液晶層は、特定の方向に回転する円偏光を透過し、前記特定の方向とは異なる方向に回転する円偏光を反射し、
前記位相差板は、前記コレステリック液晶層を透過した円偏光を直線偏光にすることを特徴とする。
前記反射型偏光板は、複数の金属細線が形成された基材によって構成され、前記複数の金属細線の間隔よりも大きい波長の光について、前記金属細線に垂直な電界ベクトルを有する成分を透過し、前記金属細線に平行な電界ベクトルを有する成分を反射することを特徴とする。
表示パネルを更に含み、本発明の第1の局面に係る面状照明装置を備えたことを特徴とする。
図2は、本発明の一実施形態に係るエッジライト型のバックライト装置の分解斜視図である。また、図1は、図2で符号9で示す矢印の方向からこのバックライト装置を見たときの断面図である。このバックライト装置は、光源(発光体)としての複数個のLED40と、シャーシ50と、LED40から発せられた光を液晶パネルに向けて面状に出射させるための導光板20と、導光板20内で裏面側に向かう光を反射させるための反射シート30と、液晶パネルに向けて照射される光の効率を高めるための光学シート10とによって構成されている。LED40は例えば10mmピッチ(間隔)で基板に実装され、その基板が図2に示すようにシャーシ50の一方の辺58およびその対辺59に固定されている。また、各LED40は、図1で右方向に発光のピークがあるように配置されている。シャーシ50は、図1に示すように、LED40が実装されている基板を支持する側面側シャーシ51と光学シート10の上部に配置される上面側シャーシ52とから構成されている。
上面側シャーシ52の中央側端面と導光板20の端面との間の距離L1:5mm。
上記はみ出し量L2:1mm。
導光板20の端面と側面側シャーシ51との間の距離L3:3mm。
導光板20の端面とLED40の先端部との間の距離L4:1.6mm。
黒印刷60の幅L5:3mm。
光学シート10のうち最も液晶パネル側(図1の発光面側)に配置されるシートには、反射型偏光板11が採用されている。反射型偏光板11は、一部の光を透過して、残りの光を反射する。そして、反射型偏光板11を透過した光は、液晶パネルの両面に設けられている偏光板のうちのバックライト装置側の偏光板に入射される。
次に、本実施形態において、(図1の左右方向についての)上述のはみ出し量L2および光学シート10上の黒印刷60の幅L5がどのようにして決定されたかについて説明する。
次に、本実施形態における上面側シャーシ52について詳しく説明する。本実施形態においては、材質についてはポリカーボネートが採用されており、厚さについては1.0mm~1.5mmとされている。また、色については黒色が採用されている。上述したように本実施形態に係るバックライト装置は典型的には大型の液晶パネル向けのものとして採用されるところ、以下、一般に白色のシャーシが採用される携帯電話等の小型の液晶パネル向けのバックライト装置と対比しつつ、本実施形態において上面側シャーシ52の色に黒色が採用される理由について説明する。
本実施形態によれば、狭額縁化されたバックライト装置において、互いに対向するLED間の方向について、反射型偏光板11の長さは導光板20の長さよりも長くされている。すなわち、従来の構成と比較すると、反射型偏光板11の端部が導光板20の端面よりもLED40側にはみ出した構成となっている。このため、従来の構成によれば上面側シャーシ52によって吸収されていた光の一部が、図10で符号70で示す矢印のように反射型偏光板11で反射して導光板20に入射される。これにより、LED40から出射される光の利用効率が高まり、輝度が向上する。また、本実施形態によれば、光学シート10のうちの拡散シート13の一部の領域に遮光部としての黒印刷60が施されている。このため、LED40から出射されて導光板20に入射されずに光学シート10に入射された光は黒印刷60によって吸収される。これにより、表示領域のエッジ部(バックライト装置のアクティブエリア端部近傍)における光漏れの発生が抑制される。
上記実施形態においては、薄膜積層方式の反射型偏光板11が採用されているが、本発明はこれに限定されない。例えば、以下に説明する方式(「コレステリック液晶方式」および「ワイヤグリッド方式」という。)で実現される反射型偏光板11が採用された構成であっても良い。
5…P波
6…S波
10…光学シート
11…反射型偏光板
12…プリズムシート
13…拡散シート
20…導光板
30…反射シート
40…LED(発光ダイオード)
50…シャーシ
51…側面側シャーシ
52…上面側シャーシ
60…黒印刷
L2…はみ出し量
L5…黒印刷の幅
Claims (11)
- 複数の光源と、前記光源から発せられた光を面状に出射させるための導光板と、前記導光板の発光面側に配置された複数の光学シートと、前記導光板の位置を基準にして前記導光板の発光面側とは反対側に配置された反射シートとを備えた面状照明装置であって、
前記複数の光学シートを固定するためのシャーシを有し、
前記複数の光学シートのうちの少なくとも1つの光学シートには、前記面状照明装置の非発光領域に相当する領域の一部に遮光部が設けられ、
前記複数の光学シートのうち前記導光板から最も離れた位置に配置されている光学シートは、一部の光を透過して残りの光を反射する反射型偏光板であって、
前記シャーシを形成する面のうち前記光源が設けられている面に対して垂直な方向である第1方向について、前記反射型偏光板の端部が前記導光板の端部よりも前記光源側に位置するように、前記反射型偏光板の長さが前記導光板の長さよりも長くされていることを特徴とする、面状照明装置。 - 前記第1方向について、前記導光板の端部と前記反射型偏光板の端部との間の距離は、前記導光板の端部と前記光源が設けられているシャーシの面との間の距離の少なくとも3分の1にされていることを特徴とする、請求項1に記載の面状照明装置。
- 前記第1方向について、前記導光板の端部と前記反射型偏光板の端部との間の距離は、少なくとも1ミリメートルにされていることを特徴とする、請求項1に記載の面状照明装置。
- 前記遮光部は、前記第1方向について、前記光学シート上における前記面状照明装置の発光領域の端部に相当する位置から前記反射型偏光板以外の前記光学シートの端部までの領域のうちの少なくとも3分の1の領域に設けられていることを特徴とする、請求項1に記載の面状照明装置。
- 前記遮光部は、前記光学シートに黒印刷が施されることによって形成されていることを特徴とする、請求項1に記載の面状照明装置。
- 前記シャーシのうち前記光学シートよりも発光面側に配置されている部分は黒色であることを特徴とする、請求項1に記載の面状照明装置。
- 前記シャーシのうち前記光学シートよりも発光面側に配置されている部分の厚さは1.5ミリメートル以下であることを特徴とする、請求項6に記載の面状照明装置。
- 前記反射型偏光板は、互いに屈折率の異なる複数の薄膜によって構成され、特定の方向に振動する直線偏光を透過し、前記特定の方向に対して垂直な方向に振動する直線偏光を反射することを特徴とする、請求項1に記載の面状照明装置。
- 前記反射型偏光板は、コレステリック液晶層と位相差板とによって構成され、
前記コレステリック液晶層は、特定の方向に回転する円偏光を透過し、前記特定の方向とは異なる方向に回転する円偏光を反射し、
前記位相差板は、前記コレステリック液晶層を透過した円偏光を直線偏光にすることを特徴とする、請求項1に記載の面状照明装置。 - 前記反射型偏光板は、複数の金属細線が形成された基材によって構成され、前記複数の金属細線の間隔よりも大きい波長の光について、前記金属細線に垂直な電界ベクトルを有する成分を透過し、前記金属細線に平行な電界ベクトルを有する成分を反射することを特徴とする、請求項1に記載の面状照明装置。
- 表示パネルを更に含み、請求項1に記載の面状照明装置を備えたことを特徴とする、表示装置。
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CN112578590A (zh) * | 2019-09-29 | 2021-03-30 | 京东方科技集团股份有限公司 | 背光模组及显示装置 |
CN112578590B (zh) * | 2019-09-29 | 2022-04-29 | 京东方科技集团股份有限公司 | 背光模组及显示装置 |
Also Published As
Publication number | Publication date |
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CN102597603A (zh) | 2012-07-18 |
CN102597603B (zh) | 2014-09-03 |
JPWO2011080955A1 (ja) | 2013-05-09 |
EP2520851A4 (en) | 2013-06-05 |
US20120230008A1 (en) | 2012-09-13 |
RU2012132305A (ru) | 2014-02-10 |
US8672528B2 (en) | 2014-03-18 |
EP2520851A1 (en) | 2012-11-07 |
JP5284489B2 (ja) | 2013-09-11 |
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