WO2010146892A1 - 照明装置、表示装置、及びテレビジョン受像器 - Google Patents
照明装置、表示装置、及びテレビジョン受像器 Download PDFInfo
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- WO2010146892A1 WO2010146892A1 PCT/JP2010/052311 JP2010052311W WO2010146892A1 WO 2010146892 A1 WO2010146892 A1 WO 2010146892A1 JP 2010052311 W JP2010052311 W JP 2010052311W WO 2010146892 A1 WO2010146892 A1 WO 2010146892A1
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- inclined surface
- lighting device
- diffusion plate
- reduction process
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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
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
-
- 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
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
-
- 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
- G02F1/133602—Direct backlight
- G02F1/133604—Direct backlight with lamps
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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
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
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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
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
-
- 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
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/46—Fixing elements
Definitions
- the present invention relates to a lighting device, a display device including the lighting device, and a television receiver including the display device.
- a display device that does not emit light by itself for example, a display device that uses a liquid crystal display panel, is usually combined with a lighting device that illuminates the display panel from behind.
- Various types of light sources such as cold-cathode tubes and light-emitting elements are used as the light source of this type of lighting device.
- Light emitting elements include light emitting diodes (hereinafter referred to as “LEDs”), organic electroluminescent elements, inorganic electroluminescent elements, and the like, but LEDs are currently the mainstream.
- the light source of the illumination device described in Patent Document 1 is also an LED.
- an LED 122 is mounted on a mounting board 121 and a lens 124 that covers the LED 122 is attached to the mounting board 121 as shown in FIG.
- the mounting substrate 121, the LED 122, and the lens 124 constitute a light emitting module mj.
- a large number of light emitting modules mj are arranged in a matrix to constitute a planar light source.
- a lighting device of the type described in Patent Document 1 or a lighting device in which a plurality of cold-cathode tubes are arranged in parallel is combined with a display device, unevenness of brightness on the screen occurs when light from the light source directly enters the lighting device. Therefore, a diffusion plate that diffuses light is disposed between the light source and the display device. Generally, the diffuser plate is configured as a part of the lighting device.
- FIG. 12 shows a configuration example of a lighting device provided with a diffusion plate.
- the lighting device 101 is assembled based on a chassis 102 made of sheet metal.
- the chassis 102 is shaped like a tray, and a rising wall 102b is formed on the outer periphery of a rectangular main plane 102a.
- a plurality of cold cathode tubes 103 are arranged in parallel at predetermined intervals on the upper surface of the main plane 102a.
- the outermost part is placed on the rising wall 102b of the chassis 102, and the inner part is an inclined surface 104a that goes down toward the main plane 102a.
- the lowermost portion of the inclined surface 104a is connected to a main plane 104b that overlaps the main plane 102a.
- Patent Document 2 An example of such a lighting device can be seen in Patent Document 2, for example.
- the diffusion plate 105 is placed on the rising wall 102b so as to overlap the reflection sheet 104. Furthermore, a prism sheet 106 and a microlens sheet 107 are placed thereon.
- the light emitted from the cold cathode tube 103 irradiates the diffusion plate 105 from the back surface.
- Light that is not directed directly toward the diffusion plate 105 is reflected by the reflection sheet 104 toward the diffusion plate 105. Since light is diffused by the diffusing plate 105, the diffusing plate 105 appears as a relatively uniform luminance surface from the outside.
- Light emitted from the cold cathode tube 103 in the lateral direction strikes the inclined surface 104 a of the reflection sheet 104 and is reflected in the direction of the diffusion plate 105.
- the cold cathode tube 103 is used as a light source, but it goes without saying that a light emitting element such as an LED can be used as a light source.
- the inclined surface of the reflection sheet seen in the configuration example of FIG. 12 brings about the effect that it is not necessary to arrange a light source directly under the peripheral edge of the diffuser plate, while emitted light from a large number of light sources gathers there. An excessive amount of light may be reflected in the direction of the diffuser. For this reason, as shown in FIG. 13, the luminance may increase only at the peripheral edge of the diffusion plate. In the illumination device combined with the display device, it is required that the luminance of the diffusion plate is uniform over the entire surface. Therefore, it is necessary to eliminate such uneven luminance.
- the present invention has been made in view of the above points, and in an illuminating device including a reflection sheet that reflects light emitted from a light source toward a diffusion plate, an inclined surface formed on the peripheral edge of the reflection sheet is unnecessarily high.
- the object is to prevent brightness from being introduced into the diffuser.
- a diffusion plate a chassis that supports the diffusion plate, a light source that is disposed on the chassis and irradiates light to the diffusion plate, covers the chassis entirely,
- an illumination device including a reflection sheet that reflects light emitted from a light source toward the diffuser plate, an inclined surface that reflects light emitted from the light source in the lateral direction toward the diffuser plate at a peripheral edge of the reflection sheet And the reflectance was reduced on the inclined surface.
- the reflectance lowering process is performed by forming a large number of small holes on the inclined surface.
- the drilling process since the drilling process may be performed in the reflection sheet molding process, the reflectance reduction process can be efficiently performed.
- the reflectance reduction process is performed by forming a large number of irregularities on the inclined surface.
- the reflectance reduction process is performed by forming a stepped portion on the inclined surface.
- the reflectance reduction process is performed by printing the inclined surface with a light absorption rate higher than that of the inclined surface itself.
- the reflectance reduction process can be efficiently performed by a printing method.
- the reflectance reduction process is performed by attaching a sheet having a higher light absorption rate than the inclined surface itself to the inclined surface.
- the reflectance reduction process can be efficiently performed by a method of sticking a sheet.
- the light source is a light emitting element.
- a lighting device with low power consumption can be configured using a light emitting element with high luminous efficiency.
- the light emitting element is covered with a diffusing lens.
- the spread of light emitted from the light emitting element is increased, and a wide area can be covered with a relatively small number of light emitting elements.
- the light emitting element is an LED.
- the light source is a cold cathode tube.
- a lighting device with low power consumption can be configured.
- a display device including the illumination device having the above-described configuration and a display panel that receives light from the illumination device is configured.
- the display panel is a liquid crystal display panel.
- a television receiver including the display device having the above configuration is configured.
- an inclined surface that reflects light emitted from the light source in the lateral direction in the direction of the diffusion plate is formed on the peripheral portion of the reflection sheet that reflects the light emitted from the light source toward the diffusion plate.
- an unnecessarily large amount of reflected light does not travel from the inclined surface to the diffuser plate, and the brightness at the peripheral edge of the diffuser plate does not increase disproportionately with other locations. .
- FIG. 1 is an exploded perspective view of a display device including a lighting device according to a preferred embodiment of the present invention. It is a fragmentary sectional view of 1st Embodiment of an illuminating device. It is a partial top view of the illuminating device of FIG. It is a fragmentary sectional view of 2nd Embodiment of an illuminating device. It is a partial top view of the illuminating device of FIG. It is a fragmentary sectional view of 3rd Embodiment of an illuminating device. It is a fragmentary top view of the illuminating device of FIG. It is a fragmentary sectional view of 4th Embodiment of an illuminating device.
- FIG. 1 The structure of an embodiment of a display device provided with a lighting device according to a preferred embodiment of the present invention will be described with reference to FIGS.
- the display device 69 is drawn in a state where it is placed horizontally so that the display surface faces upward.
- the display device 69 uses a liquid crystal display panel 59 as a display panel.
- the liquid crystal display panel 59 and the backlight unit 49 that illuminates it from behind are accommodated in one housing.
- the housing is configured by combining the front housing member HG1 and the back housing member HG2.
- the liquid crystal display panel 59 is bonded to an active matrix substrate 51 including a switching element such as a thin film transistor (TFT) and an opposing substrate 52 facing the active matrix substrate 51 with a sealant (not shown) interposed therebetween, and facing the active matrix substrate 51.
- TFT thin film transistor
- the liquid crystal is injected between the substrates 52.
- a polarizing film 53 is attached to each of the light receiving surface side of the active matrix substrate 51 and the emission side of the counter substrate 52.
- the liquid crystal display panel 59 forms an image using a change in light transmittance caused by the inclination of liquid crystal molecules.
- the backlight unit 49 in which the lighting device according to the present invention takes a specific form has the following configuration. That is, the backlight unit 49 includes a light emitting module MJ, a chassis 41, a large reflective sheet 42, a diffusion plate 43, a prism sheet 44, and a microlens sheet 45.
- the chassis 41 is shaped like a tray, and a rising wall 41b is formed on the outer periphery of a rectangular main plane 41a.
- the light emitting module MJ includes a mounting substrate 21, an LED 22 as a light emitting element, a diffusion lens 24, and a built-in reflective sheet 11.
- the significance of the diffusing lens 24 will be described.
- the illumination device of FIG. 11 seems to eliminate luminance unevenness because the light spread of each LED 122 is small although the lens 124 is combined.
- LEDs As described above, recently, the brightness of LEDs has been increased, and it has become possible to cover the amount of light for the entire screen with a relatively small number of LEDs. However, since it is inevitable that uneven brightness occurs if high-brightness LEDs are arranged sparsely, lenses with high light diffusion performance (such lenses are referred to as “diffuse lenses” in this specification). Are preferably used in combination.
- FIG. 14 is a graph showing how illuminance (unit Lux) differs between a single LED and an LED with a diffusing lens depending on the irradiation direction.
- the peak is 90 °, which is the angle of the optical axis, and the illuminance decreases rapidly as the distance from the peak is increased.
- an LED with a diffusing lens it is possible to widen a region where illuminance of a certain level or more can be ensured and set the peak of illuminance at an angle different from the optical axis. It goes without saying that the illuminance pattern in the figure can be changed in any way by the design of the diffusing lens.
- FIG. 15 shows a collective image of the luminance of a plurality of LEDs.
- the solid line waveform represents the luminance of the LED with a diffusion lens
- the dotted line waveform represents the luminance of a single LED.
- the horizontal line in the waveform indicates the width of the waveform (half-value width) at a luminance that is half the peak value.
- each waveform can be widened, so that it is easy to make the luminance as a whole as a flat shape as shown by a solid line above the figure.
- each waveform has a height, while the width is narrow, and it is inevitable that a wave is generated in the luminance obtained by collecting them. As described above, an image having uneven brightness is not preferable. Therefore, the use of an LED with a diffusion lens is almost inevitable.
- the light emitting module MJ includes the diffusing lens 24.
- the mounting substrate 21 is an elongated rectangle, and a plurality of electrodes (not shown) are formed at predetermined intervals in the longitudinal direction on the mounting surface 21U on the upper surface, and the LEDs 22 are mounted on these electrodes.
- the mounting substrate 21 is a common substrate for the plurality of LEDs 22. That is, a plurality of combinations of the LED 22, the diffusing lens 24, and the built-in reflection sheet 11 are arranged at predetermined intervals along the longitudinal direction of the mounting substrate 21 as shown in FIG.
- the diffusing lens 24 is circular in a planar shape, has a plurality of leg portions 24a on the lower surface, and is attached to the mounting substrate 21 by bonding the tips of the leg portions 24a to the mounting surface 21U of the mounting substrate 21 with an adhesive. Due to the presence of the leg portion 24 a, a gap is generated between the mounting substrate 21 and the diffusion lens 24. The LED 22 is cooled by the airflow flowing through the gap. If the problem of heat dissipation can be solved, an integrally molded light emitting module in which LEDs are embedded in a diffusing lens can be used.
- a blue light emitting LED chip is combined with a phosphor that emits yellow light by receiving light from the LED chip, and an LED of a type that generates white light by combining the blue light and yellow light emitted by the phosphor.
- a blue light emitting LED chip is combined with a phosphor that emits green light in response to light from the LED chip and a phosphor that emits red light. The blue light, green light, and red light emitted by the phosphor are combined. It is also possible to use a type of LED that produces white light.
- red LED chip, blue LED chip, and phosphor emitting blue light with blue light from blue LED chip By combining red LED chip, blue LED chip, and phosphor emitting blue light with blue light from blue LED chip, and combining them with red light, blue light and green light An LED of a type that generates white light can also be used.
- a red LED chip, a green LED chip, and a blue LED chip can be combined, and a type of LED that generates white light by combining red, green, and blue light emitted from them can be used. .
- a mounting board 21 in which five LEDs 22 are arranged per sheet and a mounting board 21 in which eight LEDs 22 are arranged per sheet are used in combination.
- the mounting substrate 21 having five LEDs 22 and the mounting substrate 21 having eight LEDs 22 are each provided with connectors 25 attached to one edge in the longitudinal direction (not to mention that there are male and female connectors). Connected and connected.
- a plurality of combinations of the mounting substrate 21 having five LEDs 22 and the mounting substrate 21 having eight LEDs 22 are arranged on the chassis 41 in parallel with each other.
- the arrangement of the LEDs 22 on the mounting board 21 is the long side direction of the chassis 41, that is, the direction of the arrow X in FIG. 1, and the direction in which the combination of the two mounting boards 21 is arranged is the short side direction of the chassis 41, that is, Y in FIG. From the direction of the arrow, the LEDs 22 are arranged in a matrix.
- the mounting substrate 21 is fixed to the chassis 41 by appropriate means such as caulking, bonding, screwing, and riveting.
- the built-in reflection sheet 11 is disposed between the mounting substrate 21 and the diffusing lens 24.
- the built-in reflection sheet 11 is fixed at a position facing the lower surface of the diffusion lens 24 on the mounting surface 21U.
- the built-in reflective sheet 11 has a higher light reflectance than the mounting substrate 21.
- the built-in reflection sheet 11 is also a planar shape circle and is concentric with the diffusion lens 24.
- the built-in reflective sheet 11 has a larger diameter.
- the built-in reflection sheet 11 is formed with a through hole through which the leg portion 24a of the diffusing lens 24 passes.
- the chassis 41 is overlaid with a reflective sheet 42 having a similar planar shape.
- the reflection sheet 42 is also a foamed resin sheet similar to the built-in reflection sheet 11.
- the outermost part is placed on the rising wall 41 b of the chassis 41, and the inner part is an inclined surface 42 a that falls toward the main plane 41 a of the chassis 41.
- the lowermost part of the inclined surface 42a is connected to the main plane 42b of the reflection sheet 42 itself.
- the main plane 42b overlaps the built-in reflective sheet 11.
- the reflective sheet 42 is formed with a circular passage opening 42H1 having a size that allows the diffuser lens 24 to pass through but the built-in reflective sheet 11 cannot pass through, in accordance with the position of the light emitting module MJ.
- a rectangular passage opening 42 ⁇ / b> H ⁇ b> 2 for projecting the connector 25 is formed in the reflection sheet 42 according to the position of the connector 25.
- the light emitted from the LED 22 irradiates the diffusion plate 43 from the back surface.
- Light that is not directed directly toward the diffusion plate 43 is reflected toward the diffusion plate 43 by the reflection sheet 42 or the built-in reflection sheet 11. Since light is diffused inside the diffusing plate 43, the diffusing plate 43 appears as a relatively uniform luminance surface from the outside.
- the light emitted from the LED 22 in the lateral direction strikes the inclined surface 42 a of the reflection sheet 42 and is reflected in the direction of the diffusion plate 43.
- the reflectance reduction process is performed on the inclined surface 42a surrounding the main plane 42b like a frame.
- the content of the reflectance reduction process is to form a large number of small holes 46A in the inclined surface 42a.
- the light that has come to the small hole 46A passes through the back of the inclined surface 42a.
- the light that has escaped to the back side of the inclined surface 42a is repeatedly reflected between the front surface of the chassis 41 and the back surface of the reflection sheet 43. In that light, the light passes back through the small holes 46A and returns to the front side of the reflection sheet 42.
- the amount of light coming is small. Therefore, the amount of reflected light that is reflected by the inclined surface 42a and travels toward the diffuser plate 43 is reduced, and the luminance of the peripheral edge of the diffuser plate 43 does not increase disproportionately with other locations.
- the reflectance reduction process can be efficiently performed.
- the parts to be punched can be connected by perforations, and if necessary, the parts can be pushed out to the back side.
- the content of the reflectance reduction process is to form a large number of irregularities on the inclined surface 42a.
- a large number of hemispherical depressions (dimples) 46B are provided on the inclined surface 42a to form irregularities.
- the depression 46B does not reflect light uniformly in the direction of the diffusion plate 43 like the flat inclined surface 42a on the outer side. Reflection is also made in a direction different from the direction of the diffusion plate 43. Therefore, the amount of reflected light that is reflected by the inclined surface 42a and travels toward the diffuser plate 43 is reduced, and the luminance of the peripheral edge of the diffuser plate 43 does not increase disproportionately with other locations.
- the shape of the recess 46B is not limited to a hemisphere. Various shapes such as a cone, a triangular pyramid, a quadrangular pyramid, a cylinder, and a rectangular parallelepiped can be used. It is also possible to reverse the shape of the depression to form a projection, and the projection can form an unevenness. You may mix a hollow and a protrusion.
- the content of the reflectance reduction process is to form the stepped portion 46C on the inclined surface 42a.
- the stepped portion 46C does not reflect light uniformly in the direction of the diffuser plate 43 like the flat inclined surface 42a before and after the stepped portion 46C, but reflects in a direction different from the planar portion.
- the amount of reflected light that is reflected by the surface 42a and travels toward the diffusion plate 43 decreases as a whole. Therefore, the luminance at the peripheral edge of the diffusing plate 43 does not increase disproportionately with other locations.
- the optimal values for the shape of the stepped portion 46C and the position on the inclined surface 42a should be determined through experiments. Since a large number of the stepped portions 46C can be molded at once in the molding process of the reflective sheet 42, the reflectance reduction process can be efficiently performed.
- the content of the reflectance reduction process is to perform printing with a light absorption rate higher than that of the inclined surface itself on the inclined surface 42 a.
- a dark color ink is used to form a halftone dot pattern or a striped pattern or a grid pattern in which lines are arranged to increase the light absorption rate.
- solid printing can also be performed.
- the printing unit 46D having a higher light absorption rate does not reflect light compared to the non-printing unit, the amount of reflected light that is reflected by the inclined surface 42a and travels toward the diffusion plate 43 is reduced as a whole. Therefore, the luminance of the peripheral edge of the diffusion plate 43 does not increase disproportionately with other locations.
- the optimal values of the light absorptivity, area, and position on the inclined surface 42a of the printing unit 46D should be determined through experiments.
- the reflectance reduction process can be efficiently performed by a printing technique such as screen printing.
- a sheet having a higher light absorption rate than the inclined surface itself may be attached to the inclined surface 42a. This also makes it possible to efficiently perform the reflectance reduction process.
- the light emitting element can be replaced with a cold cathode tube.
- FIG. 10 shows a configuration example of a television receiver in which the display device 69 is incorporated.
- the television receiver 89 is configured such that a display device 69 and a control board group 92 are housed in a cabinet configured by combining a front cabinet 90 and a rear cabinet 91, and the cabinet is supported by a stand 93.
- the present invention can be widely used for lighting devices that irradiate light from a light source to a diffusion plate. Further, the present invention can be widely used for a display device including the lighting device and a television receiver including the display device.
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- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
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Abstract
Description
41 シャーシ
43 拡散板
MJ 発光モジュール
11 内蔵反射シート
21 実装基板
22 LED
24 拡散レンズ
42 反射シート
42a 傾斜面
42b 主平面
46A 小孔
46B 窪み
46C 階段状部
46D 印刷部
59 液晶表示パネル
69 表示装置
89 テレビジョン受像器
Claims (13)
- 照明装置であって、以下を特徴とするもの:
拡散板と、前記拡散板を支持するシャーシと、前記シャーシ上に配置され、前記拡散板に光を照射する光源と、前記シャーシを全面的に覆い、前記光源の発する光を前記拡散板に向けて反射する反射シートとを含み、
前記反射シートの周縁部に、前記光源から横方向に出射する光を前記拡散板の方向に反射する傾斜面を形成するとともに、前記傾斜面に反射率低下処理を施した。 - 請求項1の照明装置であって、以下を特徴とするもの:
前記反射率低下処理は、前記傾斜面に多数の小孔を形成することによってなされる。 - 請求項1の照明装置であって、以下を特徴とするもの:
前記反射率低下処理は、前記傾斜面に多数の凹凸を形成することによってなされる。 - 請求項1の照明装置であって、以下を特徴とするもの:
前記反射率低下処理は、前記傾斜面に階段状部を形成することによってなされる。 - 請求項1の照明装置であって、以下を特徴とするもの:
前記反射率低下処理は、前記傾斜面に傾斜面自身よりも光吸収率の高い印刷を施すことによってなされる。 - 請求項1の照明装置であって、以下を特徴とするもの:
前記反射率低下処理は、前記傾斜面に傾斜面自身よりも光吸収率の高いシートを貼り付けることによってなされる。 - 請求項1の照明装置であって、以下を特徴とするもの:
前記光源が発光素子である。 - 請求項7の照明装置であって、以下を特徴とするもの:
前記発光素子は拡散レンズで覆われる。 - 請求項7の照明装置であって、以下を特徴とするもの:
前記発光素子はLEDである。 - 請求項1の照明装置であって、以下を特徴とするもの:
前記光源は冷陰極管である。 - 表示装置であって、以下を特徴とするもの:
請求項1から10のいずれかの照明装置と、前記照明装置からの光を受ける表示パネルと、を含む。 - 請求項11の表示装置であって、以下を特徴とするもの:
前記表示パネルは液晶表示パネルである。 - テレビジョン受像器であって、以下を特徴とするもの:
請求項11の表示装置を備える。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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BRPI1013536A BRPI1013536A2 (pt) | 2009-06-15 | 2010-02-17 | dispositivo de iluminação, dispositivo de exibição e receptor de televisão |
JP2011519623A JPWO2010146892A1 (ja) | 2009-06-15 | 2010-02-17 | 照明装置、表示装置、及びテレビジョン受像器 |
RU2012101282/07A RU2496050C2 (ru) | 2009-06-15 | 2010-02-17 | Осветительное устройство, устройство отображения и телевизионный приемник |
CN2010800238791A CN102449376A (zh) | 2009-06-15 | 2010-02-17 | 照明装置、显示装置以及电视接收机 |
EP10789270A EP2426395A1 (en) | 2009-06-15 | 2010-02-17 | Illumination device, display device, and television receiver |
US13/320,785 US20120069248A1 (en) | 2009-06-15 | 2010-02-17 | Illumination device, display device, and television receiver |
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JP2009141745 | 2009-06-15 | ||
JP2009-141745 | 2009-06-15 |
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PCT/JP2010/052311 WO2010146892A1 (ja) | 2009-06-15 | 2010-02-17 | 照明装置、表示装置、及びテレビジョン受像器 |
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US (1) | US20120069248A1 (ja) |
EP (1) | EP2426395A1 (ja) |
JP (1) | JPWO2010146892A1 (ja) |
CN (1) | CN102449376A (ja) |
BR (1) | BRPI1013536A2 (ja) |
RU (1) | RU2496050C2 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
US20120069248A1 (en) | 2012-03-22 |
BRPI1013536A2 (pt) | 2016-04-12 |
RU2496050C2 (ru) | 2013-10-20 |
JPWO2010146892A1 (ja) | 2012-12-06 |
EP2426395A1 (en) | 2012-03-07 |
RU2012101282A (ru) | 2013-08-27 |
CN102449376A (zh) | 2012-05-09 |
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