WO2009107270A1 - バックライト装置、表示装置およびテレビジョン受像機 - Google Patents
バックライト装置、表示装置およびテレビジョン受像機 Download PDFInfo
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- WO2009107270A1 WO2009107270A1 PCT/JP2008/068035 JP2008068035W WO2009107270A1 WO 2009107270 A1 WO2009107270 A1 WO 2009107270A1 JP 2008068035 W JP2008068035 W JP 2008068035W WO 2009107270 A1 WO2009107270 A1 WO 2009107270A1
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- WIPO (PCT)
- Prior art keywords
- light
- wavelength
- backlight device
- filter
- light source
- Prior art date
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- 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
- G02B6/0026—Wavelength selective element, sheet or layer, e.g. filter or grating
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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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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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
- G02F2202/00—Materials and properties
- G02F2202/40—Materials having a particular birefringence, retardation
Definitions
- the present invention relates to a backlight device, a display device, and a television receiver, and more particularly to a backlight device, a display device, and a television receiver provided with a white light source.
- a backlight device including a white light source such as a pseudo white LED (pseudo white light emitting diode) or an RGB-LED is known.
- a white light source such as a pseudo white LED (pseudo white light emitting diode) or an RGB-LED is known.
- the pseudo white LED is composed of, for example, a blue light emitting element and a fluorescent material that converts light emitted from the blue light emitting element into light having a wavelength longer than that of blue light. Then, pseudo white light is obtained by additively mixing blue light and light having a wavelength longer than that of blue light.
- a backlight device using such a pseudo-white LED light having a wavelength between B (blue) and G (green) (for example, a wavelength of 490 nm to 510 nm), G (green) and R (red)
- a large amount of light having a wavelength between 1 and 2 for example, a wavelength of 570 nm to 590 nm is present in the pseudo-white light.
- the RGB-LED is composed of a blue light emitting element, a green light emitting element, and a red light emitting element. Then, white light is obtained by additively mixing blue light, green light, and red light. Even when such RGB-LEDs are used, the wavelength of B (blue) light and the wavelength of G (green) light are relatively close to each other, so B (blue) and G (green) ) Pass through the B region and the G region of the color filter of the display panel. Thereby, the color tone and color purity of B (blue) and G (green) were reduced.
- Patent Document 1 a white light source, a light guide plate on which light from the white light source is incident, a color liquid crystal element (display panel) irradiated with light emitted from the light guide plate, a light incident surface and light of the light guide plate
- a liquid crystal display device including a color correction plate (filter member) disposed on an emission surface is disclosed.
- the color correction plate is configured to absorb light having a wavelength near 500 nm or light having a wavelength near 590 nm at a predetermined ratio. As a result, a large amount of light having a wavelength between B (blue) and G (green) or light having a wavelength between G (green) and R (red) is included in the light after passing through the color liquid crystal element. Can be suppressed.
- Patent Document 1 when the wavelength of light emitted from a white light source varies and the amount of light having a wavelength near 500 nm or light having a wavelength near 590 nm increases, the light is converted into a color correction plate ( It is difficult to sufficiently absorb the filter member. For this reason, there exists a problem that it is difficult to suppress the fall of the color tone and color purity of a color liquid crystal element (display panel).
- the filter member is set so that the light absorption rate is increased in consideration of the wavelength variation of the light emitted from the white light source, the light is emitted when the wavelength variation of the light emitted from the white light source is small. Since it is absorbed in vain, there is a problem that the luminance of the color liquid crystal element (display panel) decreases.
- the present invention has been made to solve the above-described problems, and an object of the present invention is to improve the color tone and color purity of the display panel while suppressing the luminance of the display panel from being lowered. It is an object to provide a backlight device, a display device, and a television receiver that can be used.
- a backlight device includes a white light source having a first light exit surface and a light entrance surface on which light emitted from the first light exit surface of the white light source is incident. And a light transmissive member having a second light emitting surface from which incident light is emitted, and light having a predetermined wavelength among the light emitted from the white light source, disposed in a region through which the light emitted from the white light source passes. And a filter member that absorbs or reflects light at a predetermined ratio, and the filter member is disposed so as to be inclined with respect to at least one of the first light emission surface of the white light source and the second light emission surface of the light transmission member.
- the light absorptance or reflectance of light of a predetermined wavelength is changed when the incident angle of light changes, and the first light emitting surface of the white light source and the second light emitting member of the light transmitting member are changed. At least one of the faces The inclination angle is configured to be adjustable against.
- the filter member configured such that when the incident angle of light changes, the absorptance or reflectance of light of a predetermined wavelength changes, the first light source of the white light source is used.
- the light absorption rate or reflectance of the filter member can be reduced. As a result, it is possible to suppress light from being absorbed or reflected unnecessarily, and thus it is possible to suppress a decrease in luminance of the display panel.
- the filter member increases the first light exit surface of the white light source and the second light transmitting member when increasing the absorptance or reflectance of light having a predetermined wavelength.
- the inclination angle with respect to at least one of the light emitting surfaces is adjusted to be large and the light absorptance or reflectance of light of a predetermined wavelength is reduced, the first light emitting surface of the white light source and the second light of the light transmitting member The inclination angle with respect to at least one of the emission surfaces is adjusted to be small. If comprised in this way, the absorption factor or reflectance of the light of a predetermined wavelength among the lights radiate
- the light transmission member includes a light guide plate. If constituted in this way, the present invention can be applied to an edge light type backlight device using a light guide plate.
- the filter member is preferably disposed between the first light emitting surface of the white light source and the light incident surface of the light transmitting member.
- the light incident surface of the light guide plate has a smaller area than the second light exit surface of the light guide plate (light transmission member).
- the filter member can be reduced in size as compared with the case where the filter member is disposed on the second light exit surface side of the light guide plate (light transmission member).
- the filter member is preferably arranged with respect to the first light emitting surface of the white light source.
- the tilt angle of the white light source with respect to the first light exit surface is adjustable. If comprised in this way, the absorption factor or reflectance of the light of a predetermined wavelength among the lights radiate
- the white light source includes a blue light emitting element and a fluorescent material having a function of converting light emitted from the blue light emitting element into light having a wavelength longer than that of blue light. .
- Light (pseudo white light) emitted from a white light source including such a blue light emitting element and a fluorescent material is light having a wavelength between B (blue) and G (green) (for example, a wavelength in the vicinity of 500 nm) , G (green) and R (red) wavelength (for example, a wavelength in the vicinity of 580 nm) contains a particularly large amount of light, so a backlight using a white light source including a blue light emitting element and a fluorescent material It is particularly effective to apply the present invention to an apparatus.
- the backlight device further includes a storage member that stores the white light source, the light transmission member, and the filter member, and the storage member is engaged with one end of the filter member.
- the filter member is rotated about the engaging portion of the storage member, so that an inclination angle with respect to at least one of the first light emitting surface of the white light source and the second light emitting surface of the light transmitting member is increased. Adjusted. If comprised in this way, the inclination-angle of the filter member with respect to at least one of the 1st light emission surface of a white light source and the 2nd light emission surface of a light transmissive member can be adjusted easily.
- the other end of the filter member is provided with a fixing member for fixing the other end of the filter member. If comprised in this way, the inclination angle of the filter member with respect to at least one of the 1st light-projection surface of a white light source and the 2nd light-projection surface of a light transmissive member can be hold
- the other end of the filter member is moved in a direction perpendicular to the first light emitting surface of the white light source to move the first light emitting surface of the white light source and the light transmission.
- An angle adjusting member for adjusting an inclination angle of the filter member with respect to at least one of the second light emitting surfaces of the member is attached. If comprised in this way, the inclination-angle of the filter member with respect to at least one of the 1st light-projection surface of a white light source and the 2nd light-projection surface of a light transmissive member can be adjusted more easily.
- the filter member has a function of absorbing or reflecting light having a wavelength of 490 nm to 510 nm at a predetermined ratio among light emitted from the white light source.
- the wavelength of the B (blue) light and the wavelength of the G (green) light are closer than the wavelength of the G (green) light and the wavelength of the R (red) light. It is particularly effective to use or absorb or reflect light having a wavelength of 490 nm to 510 nm.
- the filter member includes a dichroic filter having a multilayer film in which layers having different refractive indexes are stacked.
- the filter member can be easily configured so as to absorb or reflect light having a predetermined wavelength out of the light emitted from the white light source, and the incident angle of the light. It can be easily configured so that the absorptance or reflectance of light of a predetermined wavelength changes as the value changes.
- the filter member absorbs or reflects light of the first wavelength at a predetermined ratio and absorbs or reflects light of the second wavelength at a predetermined ratio.
- a second filter member that reflects.
- the filter member includes a first filter member and a second filter member
- the first filter member and the second filter member are the first light emitting surface of the white light source and the first light transmitting member.
- the inclination angle with respect to at least one of the two light emission surfaces is configured to be individually adjustable. If comprised in this way, the absorptivity or reflectance of light with a wavelength near 500 nm and the absorptivity or reflectance of light with a wavelength near 590 nm can be individually controlled, for example. Thereby, the color tone and color purity of the display panel can be further improved.
- a display device includes the above backlight device and a display panel that is illuminated by the backlight device and includes a color filter. If comprised in this way, the display apparatus which can improve the color tone and color purity of a display panel can be obtained, suppressing the fall of the brightness
- a television receiver includes the above display device, a cabinet that houses the display device, a tuner, and a speaker. If comprised in this way, the television receiver which can improve the color tone and color purity of a display panel can be obtained, suppressing the fall of the brightness
- a backlight device, a display device, and a television receiver capable of improving the color tone and color purity of a display panel while suppressing a decrease in luminance of the display panel. Can be easily obtained.
- FIG. 1 is a cross-sectional view illustrating a structure of a backlight device and a liquid crystal display panel according to a first embodiment of the present invention. It is the figure which showed the transmission characteristic (reflection characteristic) of the color filter of the liquid crystal display panel of the backlight apparatus by 1st Embodiment shown in FIG.
- FIG. 3 is a plan view showing the structure of the backlight device according to the first embodiment shown in FIG. 2.
- FIG. 3 is a cross-sectional view showing a structure around a dichroic filter of the backlight device according to the first embodiment shown in FIG. 2.
- FIG. 3 is a cross-sectional view showing a detailed structure of a dichroic filter of the backlight device according to the first embodiment shown in FIG. 2. It is the figure which showed the transmission characteristic (reflection characteristic) of the dichroic filter of the backlight apparatus by 1st Embodiment shown in FIG.
- FIG. 3 is a perspective view for explaining the structure of the backlight device according to the first embodiment shown in FIG. 2.
- FIG. 3 is a perspective view for explaining the structure of the backlight device according to the first embodiment shown in FIG. 2.
- FIG. 3 is a plan view for explaining the structure of the backlight device according to the first embodiment shown in FIG. 2.
- FIG. 3 is a cross-sectional view showing a detailed structure of a dichroic filter of the backlight device according to the first embodiment shown in FIG. 2. It is the figure which showed the transmission characteristic (reflection characteristic) of the dichroic filter of the backlight apparatus by 1st Embodiment shown in FIG.
- FIG. 3 is a perspective view for explaining the
- FIG. 3 is a perspective view showing a structure of a slide member of the backlight device according to the first embodiment shown in FIG. 2.
- FIG. 3 is a cross-sectional view showing a structure around a dichroic filter of the backlight device according to the first embodiment shown in FIG. 2.
- FIG. 3 is a cross-sectional view showing a structure around a dichroic filter of the backlight device according to the first embodiment shown in FIG. 2.
- FIG. 5 is a cross-sectional view illustrating a structure of a backlight device according to a second embodiment of the present invention. It is the figure which showed the transmission characteristic (reflection characteristic) of the dichroic filter 35 of the backlight apparatus by 2nd Embodiment shown in FIG. FIG.
- FIG. 6 is a cross-sectional view illustrating a structure of a backlight device according to a third embodiment of the present invention. It is sectional drawing which showed the structure of the white light source by the 1st modification of this invention. It is sectional drawing which showed the structure of the white light source by the 2nd modification of this invention. It is sectional drawing which showed the structure of the backlight apparatus by the 3rd modification of this invention. It is sectional drawing which showed the structure of the backlight apparatus by the 4th modification of this invention.
- Liquid crystal display device 12 Liquid crystal display panel (display panel) 20, 30, 40, 60, 70
- Backlight device 21 Pseudo white LED (white light source) 21a Blue light emitting element 21b Fluorescent material 21e Light exit surface (first light exit surface) 22 Light guide plate (light transmission member) 22a Light entrance surface 22b Light exit surface (second light exit surface) 25 Dichroic filter (filter member, first filter member) 25d, 25e layers (layers with different refractive indexes) 25f, 25g layers (layers with different refractive indexes) 26, 36, 46 Front chassis (storage member) 27, 37, 47 Rear chassis (housing member) 27a, 37a, 37b, 47a Recess (engagement part) 28, 38, 68 Slide member (fixing member, angle adjustment member) 35 Dichroic filter (filter member, second filter member) 50, 50a White light source
- the liquid crystal television receiver 1 is an example of the “television receiver” in the present invention.
- a liquid crystal television receiver 1 including a backlight device 20 includes a liquid crystal display device 10 including the backlight device 20 and a front that houses the liquid crystal display device 10.
- the cabinet 2 and the rear cabinet 3, the speaker 4 attached to the front cabinet 2, the tuner 5, the power source 6, and the support member 7 are provided. Since the front cabinet 2, the rear cabinet 3, the speaker 4, the tuner 5, the power source 6, and the support member 7 that are conventionally used can be applied, each will be briefly described.
- the liquid crystal display device 10 is an example of the “display device” in the present invention, and the front cabinet 2 and the rear cabinet 3 are examples of the “cabinet” in the present invention.
- the front cabinet 2 and the rear cabinet 3 house a liquid crystal display device 10, a tuner 5 and a power source 6.
- the tuner 5 has a function of generating an image signal and an audio signal of a predetermined channel from the received radio wave.
- the speaker 4 has a function of emitting sound based on the sound signal generated by the tuner 5.
- the power source 6 is configured to supply power to the liquid crystal display device 10, the speaker 4, and the tuner 5.
- the liquid crystal display device 10 is supported by the support member 7.
- the speaker 4, the tuner 5, and the power source 6 may be assembled in the liquid crystal display device 10.
- the liquid crystal display device 10 includes a bezel 11, a liquid crystal display panel 12 having a peripheral edge covered with the bezel 11, and a backlight device 20 disposed on the back side of the liquid crystal display panel 12.
- the liquid crystal display panel 12 is an example of the “display panel” in the present invention.
- the liquid crystal display panel 12 includes an AM substrate (active matrix substrate) 120 and a counter substrate 121 disposed to face the AM substrate 120.
- a liquid crystal 122 is sealed between the AM substrate 120 and the counter substrate 121.
- the liquid crystal display panel 12 functions as a display panel when illuminated by the backlight device 20.
- the counter substrate 121 is provided with a color filter 121a in which a B region, a G region, and an R region (not shown) are formed.
- the B region, G region, and R region of the color filter 121a have a function of transmitting light of a predetermined wavelength.
- the B region, the G region, and the R region of the color filter 121a have transmission characteristics as shown in FIG. Therefore, light having a wavelength between B (blue) and G (green) (for example, light having a wavelength in the vicinity of 500 nm) is transmitted through the B region and the G region, and G (green) and R (red).
- B (blue) and G (green) for example, light having a wavelength in the vicinity of 500 nm
- G (green) and R red
- the wavelength of the light transmitted through the B region and the wavelength of the light transmitted through the G region are closer than the wavelength of the light transmitted through the G region and the wavelength of the light transmitted through the R region. That is, in FIG. 3, the overlapping area of the B region and the G region is larger than that of the G region and the R region. For this reason, light having a wavelength between B (blue) and G (green) (for example, light having a wavelength in the vicinity of 500 nm) easily passes through the B region and the G region in a large amount.
- the backlight device 20 is an edge light type backlight device, and includes a plurality of pseudo white LEDs 21 and a light guide plate 22 having a light incident surface 22 a on which light from the pseudo white LEDs 21 is incident.
- the plurality of optical sheets 23 disposed on the light emitting surface 22b side of the light guide plate 22, the reflection sheet 24 disposed on the back surface 22c side of the light guide plate 22, and the pseudo white LED 21 and the light guide plate 22 are disposed.
- the dichroic filter 25 is constituted by a front chassis 26 and a rear chassis 27 that house these.
- the pseudo white LED 21 is an example of the “white light source” in the present invention.
- the light guide plate 22 is an example of the “light transmitting member” in the present invention, and the light emitting surface 22b is an example of the “second light emitting surface” in the present invention.
- the dichroic filter 25 is an example of the “filter member” in the present invention, and the front chassis 26 and the rear chassis 27 are examples of the “housing member” in the present invention.
- the plurality of pseudo white LEDs 21 are arranged at a predetermined pitch in the A direction (see FIG. 4) so as to face the light incident surface 22a of the light guide plate 22, as shown in FIGS.
- the pseudo white LED 21 includes a blue light emitting element 21a, a fluorescent material 21b disposed so as to cover the blue light emitting element 21a, and a package main body 21c that houses the blue light emitting element 21a and the fluorescent material 21b.
- a protective material 21d made of resin for protecting the blue light emitting element 21a and the fluorescent material 21b.
- the blue light emitting element 21a has a function of emitting blue light having a peak wavelength of about 440 nm to about 460 nm, for example.
- the fluorescent material 21b has a function of converting part of the blue light emitted from the blue light emitting element 21a into light having a wavelength longer than that of the blue light (for example, light in a band from green light to red light). Thereby, the emission spectrum of the light (pseudo white light) emitted from the light emitting surface 21e of the pseudo white LED 21 becomes, for example, as shown in FIG.
- the light exit surface 21e is an example of the “first light exit surface” in the present invention.
- the light guide plate 22 has a function of making light (pseudo white light) from the pseudo white LED 21 incident from the light incident surface 22a and emitting the light from the light emitting surface 22b toward the liquid crystal display panel 12.
- the light incident surface 22a of the light guide plate 22 has a smaller area than the light emitting surface 22b.
- the optical sheet 23 is configured by a prism sheet, a lens sheet, or the like, and has a function of condensing light from the light guide plate 22 at a predetermined viewing angle.
- the reflection sheet 24 has a function of reflecting the light emitted from the back surface 22c of the light guide plate 22 and advancing it to the light guide plate 22 side (front side).
- the dichroic filter 25 is disposed between the light emitting surface 21e of the pseudo white LED 21 and the light incident surface 22a of the light guide plate 22. That is, the dichroic filter 25 is disposed in a region through which light emitted from the pseudo white LED 21 passes.
- the dichroic filter 25 includes a glass substrate 25a, a vapor deposition film 25b formed on one surface of the glass substrate 25a, and a vapor deposition film 25c formed on the other surface of the glass substrate 25a. It is constituted by.
- the deposited film 25b is a multilayer film in which two layers 25d and 25e having different refractive indexes are laminated. Further, in FIG. 7, the deposited film 25 b includes three layers 25 d and 25 e, but two or less layers may be stacked, or four or more layers may be stacked. The layers 25d and 25e are examples of the “layers having different refractive indexes” in the present invention.
- the vapor deposition film 25c is formed of a multilayer film in which two layers 25f and 25g having different refractive indexes are laminated, like the vapor deposition film 25b. Similarly to the vapor deposition film 25b, the vapor deposition film 25c may be laminated by two layers or less, or may be laminated by four layers or more.
- the layers 25f and 25g are examples of the “layers having different refractive indexes” in the present invention.
- the dichroic filter 25 has a function of reflecting (transmitting) light having a wavelength of about 490 nm to about 510 nm (wavelength in the vicinity of 500 nm) at a predetermined ratio.
- the dichroic filter 25 is disposed so as to be inclined with respect to the light emitting surface 21e of the pseudo white LED 21 as shown in FIG.
- the dichroic filter 25 is configured such that the inclination angle of the pseudo white LED 21 with respect to the light exit surface 21e can be adjusted, as will be described later.
- the front chassis 26 and the rear chassis 27 are made of resin.
- the front chassis 26 and the rear chassis 27 may be made of metal.
- the rear chassis 27 is formed with a concave portion 27a with which one end of the dichroic filter 25 is engaged. Then, with one end of the dichroic filter 25 engaged with the recess 27a of the rear chassis 27, the dichroic filter 25 rotates around the recess 27a of the rear chassis 27 (one end of the dichroic filter 25). The inclination angle of the dichroic filter 25 with respect to the light emitting surface 21e of the pseudo white LED 21 is adjusted.
- the concave portion 27a is an example of the “engagement portion” in the present invention.
- the front chassis 26 has a function of holding the light guide plate 22, the optical sheet 23, and the like at predetermined positions. Further, as shown in FIGS. 5 and 9, the front chassis 26 has an opening 26a formed in a front portion of the optical sheet 23, and a direction A (see FIG. 5A) formed at a predetermined distance from the opening 26a. A recess 26b extending in FIG. 9) is provided. As shown in FIGS. 5, 10, and 11, a step 26c is formed in the recess 26b. An insertion portion 26d extending in the A direction is formed in the step portion 26c. As shown in FIG. 5, the other end side of the dichroic filter 25 is inserted into the insertion portion 26d. As shown in FIGS. 10 and 11, screw holes 26e, 26f, and 26g are formed at both ends in the A direction of the stepped portion 26c, respectively.
- a slide member 28 is disposed in the recess 26b.
- the slide member 28 is formed so as not to protrude from the front surface of the front chassis 26. Thereby, it is possible to suppress the thickness of the backlight device 20 from increasing.
- the slide member 28 is an example of the “fixing member” and the “angle adjusting member” in the present invention.
- the slide member 28 is formed so that the length in the A direction (see FIG. 9) is substantially the same as or slightly smaller than the length in the A direction of the recess 26b.
- the slide member 28 is formed such that the length in the B direction is smaller than the length in the B direction of the recess 26b. Thereby, the slide member 28 is movable in the B direction inside the recess 26b.
- the slide member 28 is formed with an insertion portion 28a extending in the A direction.
- the other end of the dichroic filter 25 is inserted into the insertion portion 28a.
- the inclination angle of the dichroic filter 25 with respect to the light emitting surface 21e of the pseudo white LED 21 can be adjusted by moving the slide member 28 in a direction (B direction) perpendicular to the light emitting surface 21e of the pseudo white LED 21. It is.
- screw holes 28b are formed at both ends in the A direction of the slide member 28, respectively.
- the screw hole 28b of the slide member 28 is screwed into any of the screw holes 26e, 26f, and 26g of the step portion 26c (see FIG. 11), so that the dichroic filter 25 (see FIG. 5). Is adjusted, and the other end of the dichroic filter 25 is fixed.
- the light emitting surface 21e of the pseudo white LED 21 is obtained.
- the light emitting surface 21e of the pseudo white LED 21 is obtained.
- the pseudo white light emitted from the pseudo white LED 21 can be prevented from being unnecessarily reflected by the dichroic filter 25.
- the light reflectance (transmittance) adjustment method of the dichroic filter 25 described above is an example of the adjustment method.
- the emission spectrum of the pseudo white light emitted from the pseudo white LED 21 and the reflection characteristic (transmission) of the dichroic filter 25 are described. Characteristic), required luminance, and the like.
- the reflectance (transmittance) of light having a wavelength of about 490 nm to about 510 nm (wavelength in the vicinity of 500 nm) is changed by changing the incident angle of light.
- the filter 25 By configuring the filter 25 so that the inclination angle of the pseudo white LED 21 with respect to the light emitting surface 21e is adjustable, the pseudo white light emitted from the pseudo white LED 21 has a wavelength of about 490 nm to about 510 nm (a wavelength in the vicinity of 500 nm).
- the light reflectance (transmittance) can be controlled.
- the light having a wavelength of about 490 nm to about 510 nm can be sufficiently reflected by the dichroic filter 25.
- the light after passing through the liquid crystal display panel 12 is prevented from containing a large amount of light having a wavelength between B (blue) and G (green) (light having a wavelength of about 490 nm to about 510 nm). Therefore, the color tone and color purity of the liquid crystal display panel 12 can be improved.
- the variation in the wavelength or the like of the pseudo white light emitted from the pseudo white LED 21 is small, the light reflectance of the dichroic filter 25 can be reduced. As a result, it is possible to prevent light from being reflected unnecessarily, and thus it is possible to suppress a decrease in luminance of the liquid crystal display panel 12.
- the inclination angle of the pseudo white LED 21 with respect to the light emitting surface 21e is When the reflectance of light having a wavelength of about 490 nm to about 510 nm is reduced (increased transmittance), the inclination angle of the pseudo white LED 21 with respect to the light exit surface 21e is adjusted to be small. . Accordingly, the reflectance (transmittance) of light having a wavelength of about 490 nm to about 510 nm among the pseudo white light emitted from the pseudo white LED 21 can be easily controlled.
- the light incident surface 22a of the light guide plate 22 emits light by disposing the dichroic filter 25 between the light output surface 21e of the pseudo white LED 21 and the light incident surface 22a of the light guide plate 22. Since the area is smaller than the surface 22b, the dichroic filter 25 can be reduced in size as compared with the case where the dichroic filter 25 is disposed on the light emitting surface 22b side of the light guide plate 22.
- the pseudo white LED 21 is configured by a blue light emitting element 21a and a fluorescent material 21b having a function of converting light emitted from the blue light emitting element 21a into light having a wavelength longer than that of blue light.
- the pseudo white light emitted from the pseudo white LED 21 including the blue light emitting element 21a and the fluorescent material 21b is light having a wavelength between B (blue) and G (green) (wavelength of about 490 nm to about 510 nm). Therefore, it is particularly effective to apply the present invention to the backlight device 20 using the pseudo white LED 21 including the blue light emitting element 21a and the fluorescent material 21b.
- the rear chassis 27 is formed with a recess 27a to which one end of the dichroic filter 25 is engaged, and the dichroic filter 25 is rotated about the recess 27a of the rear chassis 27.
- the inclination angle of the pseudo white LED 21 with respect to the light exit surface 21e is adjusted. Thereby, the inclination angle of the dichroic filter 25 with respect to the light emission surface 21e of the pseudo white LED 21 can be easily adjusted.
- the slide member 28 that fixes the other end of the dichroic filter 25 to the other end of the dichroic filter 25 by attaching the slide member 28 that fixes the other end of the dichroic filter 25 to the other end of the dichroic filter 25, the inclination angle of the dichroic filter 25 with respect to the light emitting surface 21e of the pseudo white LED 21 is It can be easily held constant.
- the slide member 28 that adjusts the inclination angle of the dichroic filter 25 by moving in the direction (B direction) perpendicular to the light emitting surface 21e of the pseudo white LED 21 is provided at the other end of the dichroic filter 25. By attaching, the inclination angle of the dichroic filter 25 can be adjusted more easily.
- the dichroic filter 25 is configured to reflect light having a wavelength of 490 nm to 510 nm in a predetermined ratio among the pseudo white light emitted from the pseudo white LED 21. Since the wavelength of the B (blue) light and the wavelength of the G (green) light are closer than the wavelength of the G (green) light and the wavelength of the R (red) light, the dichroic filter 25 It is particularly effective to reflect light having a wavelength of 490 nm to 510 nm by using.
- the dichroic filter 25 includes a multilayer film in which layers 25d and 25e having different refractive indexes are stacked, and a multilayer film in which layers 25f and 25g having different refractive indexes are stacked. is doing. Accordingly, the dichroic filter 25 can be easily configured so as to reflect light having a wavelength of 490 nm to 510 nm at a predetermined ratio among the pseudo white light emitted from the pseudo white LED 21 and the incident angle of the light. It can be easily configured so that the reflectance of light having a wavelength of 490 nm to 510 nm changes as the value changes.
- the backlight device 30 includes a plurality of pseudo white LEDs 21, a light guide plate 22, a plurality of optical sheets 23, a reflection sheet 24, a pseudo white LED 21 and a light guide.
- the dichroic filters 25 and 35 disposed between the optical plates 22, and a front chassis 36 and a rear chassis 37 that store them are configured.
- the dichroic filter 25 is an example of the “filter member” and the “first filter member” in the present invention
- the dichroic filter 35 is an example of the “filter member” and the “second filter member” in the present invention.
- the front chassis 36 and the rear chassis 37 are examples of the “housing member” in the present invention.
- the dichroic filter 35 is disposed between the light emitting surface 21e of the pseudo white LED 21 and the light incident surface 22a of the light guide plate 22 at a predetermined distance from the dichroic filter 25, like the dichroic filter 25. That is, the dichroic filter 25 is disposed in a region through which light emitted from the pseudo white LED 21 passes.
- the dichroic filter 35 includes a glass substrate (not shown), a vapor-deposited film formed on one surface of the glass substrate, and a multilayer film in which two layers having different refractive indexes are laminated. It is constituted by a vapor deposition film formed of a multilayer film formed on the other surface of the substrate and laminated with two layers having different refractive indexes.
- the dichroic filter 35 has a function of reflecting (transmitting) light having a wavelength of about 570 nm to about 590 nm (wavelength in the vicinity of 580 nm) at a predetermined ratio.
- the dichroic filter 35 is configured such that the transmittance of light having a wavelength of about 570 nm to about 590 nm decreases as the incident angle of light increases.
- the dichroic filter 35 is disposed so as to be inclined with respect to the light emitting surface 21e of the pseudo white LED 21 as shown in FIG. Further, the dichroic filter 35 is configured such that the inclination angle of the pseudo white LED 21 with respect to the light emitting surface 21e can be adjusted, as will be described later.
- the rear chassis 37 is formed with a recess 37a to which one end of the dichroic filter 25 is engaged and a recess 37b to which one end of the dichroic filter 35 is engaged. Then, with the one end of the dichroic filter 25 engaged with the concave portion 37a of the rear chassis 37, the dichroic filter 25 rotates about the concave portion 37a of the rear chassis 37, whereby the light emitting surface 21e of the pseudo white LED 21 is obtained. The inclination angle of the dichroic filter 25 with respect to is adjusted.
- the dichroic filter 35 rotates around the recess 37b of the rear chassis 37 in a state where one end of the dichroic filter 35 is engaged with the recess 37b of the rear chassis 37, so that the light emitting surface 21e of the pseudo white LED 21 is rotated.
- the inclination angle of the dichroic filter 35 is adjusted.
- the concave portions 37a and 37b are examples of the “engagement portion” in the present invention.
- the front chassis 36 is provided with an opening 36a formed in the front portion of the optical sheet 23, and recesses 36b and 36c formed at a predetermined distance from the opening 26a. Steps 36d and 36e are formed in the recesses 36b and 36c, respectively. In addition, insertion portions 36f and 36g are formed in the step portions 36d and 36e, respectively. The other end side of the dichroic filter 25 is inserted into the insertion portion 36f. The other end side of the dichroic filter 35 is inserted into the insertion portion 36g. In addition, the other structure of the recessed parts 36b and 36c is the same as that of the recessed part 26b of the said 1st Embodiment.
- slide members 28 and 38 are disposed in the recesses 36b and 36c, respectively.
- the slide member 38 is formed in the same shape as the slide member 28, and is movable in the B direction inside the recess 36c.
- the slide member 38 is an example of the “fixing member” and the “angle adjusting member” in the present invention.
- the other end of the dichroic filter 35 is inserted into the insertion portion 38a of the slide member 38.
- the inclination angle of the dichroic filter 35 with respect to the light emitting surface 21e of the pseudo white LED 21 can be adjusted by moving the slide member 38 in the direction (B direction) perpendicular to the light emitting surface 21e of the pseudo white LED 21. It is.
- screw holes are formed at both ends of the slide member 38, respectively. Then, the screw hole of the slide member 38 is screwed into a screw hole (not shown) of the step portion 36e, whereby the inclination angle of the dichroic filter 35 is adjusted and the other end of the dichroic filter 35 is fixed.
- the dichroic filter 25 and the dichroic filter 35 are configured such that the inclination angle of the pseudo white LED 21 with respect to the light emitting surface 21e can be individually adjusted.
- the remaining structure of the second embodiment is the same as that of the first embodiment.
- the method of adjusting the light reflectance (transmittance) of the dichroic filters 25 and 35 of the second embodiment is the same as that of the first embodiment.
- the dichroic filter 25 that reflects light having a wavelength of about 490 nm to about 510 nm (wavelength near 500 nm) at a predetermined ratio, and a wavelength of about 570 nm to about 590 nm (wavelength near 580 nm).
- the dichroic filter 35 that reflects light at a predetermined ratio can sufficiently reflect both light having a wavelength of about 490 nm to about 510 nm and light having a wavelength of about 570 nm to about 590 nm. Thereby, the color tone and color purity of the liquid crystal display panel 12 can be further improved.
- the dichroic filter 25 and the dichroic filter 35 are configured such that the inclination angle of the pseudo white LED 21 with respect to the light emitting surface 21e is individually adjusted, so that the wavelength of about 490 nm to about 510 nm is adjusted.
- the reflectance (transmittance) of light and the reflectance (transmittance) of light having a wavelength of about 570 nm to about 590 nm can be individually controlled. Thereby, the color tone and color purity of the liquid crystal display panel 12 can be further improved.
- the backlight device 40 includes a plurality of pseudo white LEDs 21, a light guide plate 22 having a pair of light incident surfaces 22a, a plurality of optical sheets 23, a reflection sheet 24, a pseudo white LED 21 and a light guide plate.
- the dichroic filter 25 is disposed between the optical plates 22, and a front chassis 46 and a rear chassis 47 that store them are configured.
- the front chassis 46 and the rear chassis 47 are examples of the “housing member” in the present invention.
- the pseudo white LED 21 and the dichroic filter 25 are disposed on both sides of the light guide plate 22 in the B direction.
- the rear chassis 47 is formed with two recesses 47a with which one end of the dichroic filter 25 is engaged.
- the concave portion 47a is an example of the “engagement portion” in the present invention.
- the front chassis 46 is provided with an opening 46a formed in a front portion of the optical sheet 23 and two recesses 46b formed on both sides in the B direction of the opening 46a.
- the other structure of the recess 46b is the same as that of the recess 26b of the first embodiment.
- the remaining structure of the third embodiment, the method for adjusting the light reflectance (transmittance) of the dichroic filter 25, and the effects of the third embodiment are the same as those of the first embodiment.
- the present invention is not limited thereto.
- the present invention may be applied to display panels, display devices, and television receivers other than liquid crystal display panels, liquid crystal display devices, and liquid crystal television receivers.
- the present invention is not limited to this, and may be applied to a direct type backlight device.
- a diffusion plate or the like may be used as the light transmitting member.
- a pseudo white LED made of a blue light emitting element and a fluorescent material is used as a white light source.
- the present invention is not limited to this, and a pseudo white color made of a material other than the blue light emitting element and the fluorescent material. You may use LED.
- an RGB-LED composed of a blue light emitting element, a green light emitting element, and a red light emitting element may be used.
- the blue light emitting element 51, the green light emitting element 52, and the red light emitting element 53 are accommodated in different package main bodies 54, respectively.
- the blue light emitting element 51, the green light emitting element 52, and the red light emitting element 53 are accommodated in one package main body 54a. Also good.
- the package main body portions 54 and 54a Is filled with a protective material 55 for protecting the blue light emitting element 51, the green light emitting element 52 and the red light emitting element 53.
- a dichroic filter is used as the filter member.
- the present invention is not limited to this, and a filter member other than the dichroic filter may be used.
- the dichroic filter is configured to absorb light having a wavelength of about 490 nm to about 510 nm and light having a wavelength of about 570 nm to about 590 nm.
- the dichroic filter may absorb light having a wavelength other than about 490 nm to about 510 nm or light having a wavelength other than about 570 nm to about 590 nm.
- the present invention is not limited to this.
- the inclination angles of the two dichroic filters 25 and 35 with respect to the light emitting surface 21e of the pseudo white LED 21 are adjusted integrally (simultaneously).
- You may comprise as follows. Specifically, in the backlight device 60 according to the third modified example of the present invention, as shown in FIG. 20, two insertion portions 68a and 68b are formed in one slide member 68, and these two insertion portions.
- the other ends of the dichroic filters 25 and 35 are inserted into 68a and 68b, respectively.
- the inclination angles of the two dichroic filters 25 and 35 can be adjusted integrally (simultaneously).
- the light reflectance of the dichroic filter when the light emitted from the pseudo white LED (blue light or light having a longer wavelength than blue light) is shifted to the short wavelength side or the long wavelength side, the light reflectance of the dichroic filter.
- the present invention is not limited to this, and even if the light emitted from the pseudo white LED is not shifted to the short wavelength side or the long wavelength side, the B region, G region, and R of the color filter are used.
- the transmission characteristics of the region are shifted to the short wavelength side or the long wavelength side, the light reflectance of the dichroic filter may be adjusted.
- the tilt angle of the dichroic filter is adjusted to 5 °, 10 °, or 15 °.
- the present invention is not limited to this, and the tilt angle of the dichroic filter is set to 5 °, 10 °. You may adjust to angles other than (degrees) and 15 degrees. Moreover, you may comprise a dichroic filter so that an inclination angle may change continuously.
- the tilt angle is adjusted by rotating the dichroic filter about one end using a slide member.
- the tilt angle of the dichroic filter may be adjusted by a method different from that in the above embodiment.
- a rotation shaft 75a is provided at the center of the dichroic filter 75, and the dichroic filter 75 is connected to the center of the dichroic filter 75.
- the tilt angle may be adjusted by rotating around the moving shaft 75a).
- the engagement portion with which one end of the dichroic filter is engaged is provided in the rear chassis.
- the present invention is not limited to this, and one end of the dichroic filter is engaged.
- the engaging portion may be provided on a member other than the rear chassis. In this case, you may provide an engaging part in members other than a backlight apparatus.
- front chassis and the bezel are configured separately.
- present invention is not limited thereto, and the front chassis and the bezel may be configured integrally.
- the front chassis is shown as an example configured to hold the light guide plate, the optical sheet, etc., but the present invention is not limited to this, in order to hold the light guide plate, the optical sheet, etc.
- a separate member may be provided inside the front chassis. In this case, a concave portion in which the slide member is disposed may be formed in the member.
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Abstract
Description
2 フロントキャビネット(キャビネット)
3 リアキャビネット(キャビネット)
4 スピーカ
5 チューナ
10 液晶表示装置(表示装置)
12 液晶表示パネル(表示パネル)
20、30、40、60、70 バックライト装置
21 擬似白色LED(白色光源)
21a 青色発光素子
21b 蛍光材
21e 光出射面(第1光出射面)
22 導光板(光透過部材)
22a 光入射面
22b 光出射面(第2光出射面)
25 ダイクロイックフィルタ(フィルタ部材、第1フィルタ部材)
25d、25e 層(互いに屈折率の異なる層)
25f、25g 層(互いに屈折率の異なる層)
26、36、46 フロントシャーシ(収納部材)
27、37、47 リアシャーシ(収納部材)
27a、37a、37b、47a 凹部(係合部)
28、38、68 スライド部材(固定部材、角度調整部材)
35 ダイクロイックフィルタ(フィルタ部材、第2フィルタ部材)
50、50a 白色光源
75 ダイクロイックフィルタ(フィルタ部材)
121a カラーフィルタ
α1、α2、α3、α11、α12、α13 入射角度
θ1、θ2、θ3 傾斜角度
図1~図14を参照して、本発明の第1実施形態によるバックライト装置20を備えた液晶テレビジョン受像機1の構造について説明する。なお、液晶テレビジョン受像機1は、本発明の「テレビジョン受像機」の一例である。
この第2実施形態では、図15および図16を参照して、上記第1実施形態と異なり、異なる2つの波長(波長帯域)の光をそれぞれ反射する2つのダイクロイックフィルタ25および35を設けた例について説明する。
この第3実施形態では、図17を参照して、上記第1実施形態と異なり、導光板22のB方向の両側に擬似白色LED21およびダイクロイックフィルタ25を配置する例について説明する。
Claims (15)
- 第1光出射面を有する白色光源と、
前記白色光源の第1光出射面から出射した光が入射する光入射面、および、入射した光が出射する第2光出射面を有する光透過部材と、
前記白色光源から出射した光が通過する領域内に配置され、前記白色光源から出射した光のうち、所定の波長の光を所定の割合で吸収または反射するフィルタ部材とを備え、
前記フィルタ部材は、
前記白色光源の第1光出射面および前記光透過部材の第2光出射面の少なくとも一方に対して傾斜するように配置されているとともに、
光の入射角度が変化すると前記所定の波長の光の吸収率または反射率が変化するように構成されており、
かつ、
前記白色光源の第1光出射面および前記光透過部材の第2光出射面の少なくとも一方に対する傾斜角度が調整可能に構成されていることを特徴とするバックライト装置。 - 前記フィルタ部材は、
前記所定の波長の光の吸収率または反射率を大きくする場合に、前記白色光源の第1光出射面および前記光透過部材の第2光出射面の少なくとも一方に対する傾斜角度が大きくなるように調整され、
前記所定の波長の光の吸収率または反射率を小さくする場合に、前記白色光源の第1光出射面および前記光透過部材の第2光出射面の少なくとも一方に対する傾斜角度が小さくなるように調整されることを特徴とする請求項1に記載のバックライト装置。 - 前記光透過部材は、導光板を含むことを特徴とする請求項1に記載のバックライト装置。
- 前記フィルタ部材は、前記白色光源の第1光出射面と前記光透過部材の光入射面との間に配置されていることを特徴とする請求項3に記載のバックライト装置。
- 前記フィルタ部材は、前記白色光源の第1光出射面に対して傾斜するように配置されているとともに、前記白色光源の第1光出射面に対する傾斜角度が調整可能に構成されていることを特徴とする請求項4に記載のバックライト装置。
- 前記白色光源は、青色発光素子と、前記青色発光素子から出射した光を青色光よりも波長の長い光に変換する機能を有する蛍光材とを含むことを特徴とする請求項1に記載のバックライト装置。
- 前記白色光源、前記光透過部材および前記フィルタ部材を収納する収納部材をさらに備え、
前記収納部材には、前記フィルタ部材の一方端が係合される係合部が形成されており、
前記フィルタ部材は、前記収納部材の係合部を中心として回動することにより、前記白色光源の第1光出射面および前記光透過部材の第2光出射面の少なくとも一方に対する傾斜角度が調整されることを特徴とする請求項1に記載のバックライト装置。 - 前記フィルタ部材の他方端には、前記フィルタ部材の他方端を固定する固定部材が設けられていることを特徴とする請求項7に記載のバックライト装置。
- 前記フィルタ部材の他方端には、前記白色光源の第1光出射面に垂直な方向に移動することにより前記白色光源の第1光出射面および前記光透過部材の第2光出射面の少なくとも一方に対する前記フィルタ部材の傾斜角度を調整する角度調整部材が取り付けられていることを特徴とする請求項7に記載のバックライト装置。
- 前記フィルタ部材は、前記白色光源から出射した光のうち、490nm~510nmの波長の光を所定の割合で吸収または反射する機能を有することを特徴とする請求項1に記載のバックライト装置。
- 前記フィルタ部材は、互いに屈折率の異なる層が積層された多層膜を有するダイクロイックフィルタを含むことを特徴とする請求項1に記載のバックライト装置。
- 前記フィルタ部材は、第1波長の光を所定の割合で吸収または反射する第1フィルタ部材と、第2波長の光を所定の割合で吸収または反射する第2フィルタ部材とを含むことを特徴とする請求項1に記載のバックライト装置。
- 前記第1フィルタ部材と前記第2フィルタ部材とは、前記白色光源の第1光出射面および前記光透過部材の第2光出射面の少なくとも一方に対する傾斜角度が、個別に調整可能に構成されていることを特徴とする請求項12に記載のバックライト装置。
- 請求項1~13のいずれか1項に記載のバックライト装置と、
前記バックライト装置により照明されるとともに、カラーフィルタを含む表示パネルとを備えることを特徴とする表示装置。 - 請求項14に記載の表示装置と、
前記表示装置を収納するキャビネットと、
チューナと、
スピーカとを備えることを特徴とするテレビジョン受像機。
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US12/812,410 US8052320B2 (en) | 2008-02-28 | 2008-10-03 | Backlight device, display device and television receiver |
CN200880124644.4A CN101918757B (zh) | 2008-02-28 | 2008-10-03 | 背光装置、显示装置以及电视接收机 |
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KR101808191B1 (ko) * | 2011-08-26 | 2017-12-13 | 삼성전자 주식회사 | 백라이트 유닛 및 그를 가진 액정표시장치 |
KR101905527B1 (ko) * | 2011-08-30 | 2018-10-08 | 엘지이노텍 주식회사 | 라이트 유닛 및 표시장치 |
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Also Published As
Publication number | Publication date |
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CN101918757A (zh) | 2010-12-15 |
US20100283914A1 (en) | 2010-11-11 |
CN101918757B (zh) | 2012-12-12 |
US8052320B2 (en) | 2011-11-08 |
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