WO2011033899A1 - 照明装置、表示装置、及びテレビ受信装置 - Google Patents
照明装置、表示装置、及びテレビ受信装置 Download PDFInfo
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- WO2011033899A1 WO2011033899A1 PCT/JP2010/063992 JP2010063992W WO2011033899A1 WO 2011033899 A1 WO2011033899 A1 WO 2011033899A1 JP 2010063992 W JP2010063992 W JP 2010063992W WO 2011033899 A1 WO2011033899 A1 WO 2011033899A1
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- Prior art keywords
- light source
- light
- rising
- chassis
- optical member
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
- F21V7/24—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by the material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0263—Diffusing elements; Afocal elements characterised by the diffusing properties with positional variation of the diffusing properties, e.g. gradient or patterned diffuser
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0284—Diffusing elements; Afocal elements characterized by the use used in reflection
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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
- G02F1/133604—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
- G02F1/133605—Direct backlight including specially adapted reflectors
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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
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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
- G02F1/133608—Direct backlight including particular frames or supporting means
-
- 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
- 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
- G02F1/133612—Electrical details
-
- 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
- G02F2201/465—Snap -fit
Definitions
- the present invention relates to a lighting device, a display device, and a television receiver.
- a backlight device is separately required as a lighting device.
- This backlight device is well known to be installed on the back side of the liquid crystal panel (opposite the display surface), and is housed in the chassis as a lamp having an opening on the liquid crystal panel side surface.
- a large number of light sources for example, cold-cathode tubes
- an optical member such as a diffuser plate
- a reflection sheet for reflecting light from the light source to the optical member and the liquid crystal panel side.
- the linear light is converted into planar light by an optical member, thereby making the illumination light uniform.
- an optical member thereby making the illumination light uniform.
- the conversion into the planar light is not sufficiently performed, a striped lamp image is generated along the arrangement of the light sources, and the display quality of the liquid crystal display device is deteriorated.
- the number of light sources to be arranged can be increased to reduce the distance between adjacent light sources, or the diffusion degree of the diffusion plate can be increased. desirable.
- increasing the number of light sources increases the cost of the backlight device and increases the power consumption.
- a backlight device disclosed in Patent Document 1 below is known as a backlight device that maintains luminance uniformity while suppressing power consumption.
- the backlight device described in Patent Document 1 includes a diffusion plate disposed on the light emission side of a plurality of light sources, and the diffusion plate has a total light transmittance (aperture ratio) of 62 to 71%, and A light control dot pattern having a haze value of 90 to 99% is printed.
- the dot diameter is large immediately above the light source, and the dot diameter decreases as the distance from the light source increases. According to such a configuration, the light emitted from the light source is efficiently used to irradiate light having a sufficient luminance value and uniform luminance without increasing the power consumption of the light source. It is supposed to be possible.
- the present invention has been completed based on the above situation, and an object thereof is to suppress luminance unevenness.
- the illuminating device of the present invention includes a light source, a bottom plate disposed on a side opposite to the light emitting side with respect to the light source, and a chassis that houses the light source, and is disposed on the light emitting side with respect to the light source. And an optical member disposed in the chassis and having a rising portion that rises from the bottom plate side to the optical member side to reflect light, and the chassis faces the optical member.
- the portion is divided into a light source arrangement area where the light source is arranged and a light source non-arrangement area where the light source is not arranged, whereas the optical member is at least the part of the portion overlapping the light source arrangement area
- the light reflectance of the surface facing the light source side is greater than at least the light reflectance of the surface facing the light source side among the portions overlapping the light source non-arrangement region, That is, when the maximum value of the light reflectance at the surface facing at least the light source side is Rmax and the minimum value is Rmin, the rising base end position of the rising portion in the reflective sheet is expressed by the following formula (1 And a rising tip position of the rising portion is arranged not to overlap a region having the light reflectance R satisfying the following formula (1) in the optical member. Yes.
- the light emitted from the light source first reaches a portion of the optical member that has a relatively high light reflectance, so that most of the light is reflected (that is, not transmitted).
- the luminance of the illumination light is suppressed with respect to the emitted light quantity.
- the light reflected here can be reflected by the reflection sheet in the chassis and reach the light source non-arrangement region.
- the portion of the optical member that overlaps with the light source non-arrangement region has a relatively low light reflectance, so that more light is transmitted and the luminance of the predetermined illumination light can be obtained.
- the amount of light in the chassis is uniformed to some extent by setting the light reflectivity of the optical member as described above, but it is difficult to completely uniform, and the light source non-arrangement region is still more
- the amount of light tends to be smaller than the light source arrangement area.
- the amount of light supplied to the optical member is relatively smaller in the region having the light reflectance that does not satisfy the above formula (1) in the optical member than in the region having the light reflectance R that satisfies the formula (1). The tendency to decrease.
- the reflection sheet that reflects light in the chassis has a rising portion that rises from the bottom plate side of the chassis to the optical member side, the rising portion is held between the optical member and the optical member. Since the distance is narrow and the optical path length to the optical member is short, light can be efficiently guided to the optical member. That is, it is possible to supplement the amount of light supplied to the optical member by the rising portion.
- the rising base end position and the rising leading end position in the rising portion are arranged so as not to overlap with the region having the light reflectance R that satisfies the above formula (1), the rising portion satisfies the above formula (1). Since it does not exist at the boundary position between the region having the light reflectance R that satisfies and the region having the light reflectance that does not satisfy the formula (1), the amount of light supplied to the optical member is locally reduced in the vicinity of the boundary position. However, it may become a local dark part.
- the rising base end position of the rising portion overlaps the region having the light reflectance R that satisfies the above formula (1) in the optical member, and the rising tip position of the rising portion is the above formula in the optical member.
- a region having a light reflectance R that satisfies the above formula (1) and a light reflection that does not satisfy the above formula (1) are arranged so as not to overlap with a region having the light reflectance R that satisfies (1). It is arranged across the boundary position with the area having the rate. Therefore, even in the vicinity of the boundary position, the rising portion can efficiently guide light to the optical member, and a situation in which the amount of light supplied to the optical member is locally reduced can be avoided. Thereby, it becomes difficult to produce a difference in the amount of light emitted between the region having the light reflectance R satisfying the equation (1) in the optical member and the region having the light reflectance not satisfying the equation (1).
- the reflection sheet has a bottom portion that is arranged along the bottom plate and at least a part of which is arranged in the light source arrangement region, and the rising portion rises from the bottom portion to the optical member side. It is in the form.
- the portion of the reflection sheet that is arranged corresponding to the light source arrangement region is interposed between the light source and the bottom plate of the chassis. If the portion has a complicated shape, for example, a light source is installed. May be a hindrance.
- the reflection sheet is arranged in the light source arrangement region at least at a part of the bottom arranged along the bottom plate, so that the reflection sheet hinders the installation of the light source, for example. It becomes difficult to become.
- the light source has a light emitting surface that emits light, and the bottom portion is arranged to face the light emitting surface.
- the optical path length from the light emitting surface of the light source to the reflection sheet can be made longer in the light source arrangement region than when the rising base end position in the rising portion is arranged in the light source arrangement region. This makes it difficult for the light reflected by the reflection sheet in the light source arrangement region to be directly returned to the light source, thereby maintaining high light use efficiency.
- a pressing member is provided that is disposed across the bottom and the rising portion and has a pressing surface that presses the bottom and the rising portion from the optical member side. Since the rising portion of the reflection sheet has a form of rising from the bottom toward the optical member, the shape tends to become unstable, for example, the rising angle from the bottom varies, or deformation such as warping or bending occurs. In that respect, according to the present invention, the pressing member has a pressing surface arranged across the bottom portion and the rising portion of the reflection sheet, and the bottom portion and the rising portion are pressed from the optical member side by the pressing surface. Therefore, it is possible to restrict the rising portion from being displaced toward the optical member.
- a side plate that rises toward the light exit side is provided at an end portion of the bottom plate, and a receiving plate that protrudes outward is provided at a rising end portion of the side plate.
- An extension portion extending along the receiving plate is provided at the leading end portion of the.
- the rising portion is formed so that a distance held between the rising portion and the optical member decreases in a direction away from the light source.
- the amount of light in the chassis tends to decrease as the distance from the light source increases.
- the optical path length from the rising portion to the optical member is proportional to the amount of light in the chassis. It becomes a tendency. As the optical path length becomes shorter, the light can be more efficiently guided to the optical member. Therefore, the rising portion as described above can guide the light to the optical member without any unevenness.
- the rising portion is inclined. If it does in this way, light can be efficiently reflected to an optical member by the rising part which makes an inclined shape.
- the rising portion has an arc shape. If it does in this way, light can be efficiently reflected to an optical member by the rising part which makes circular arc shape.
- An angle formed by the rising portion with respect to the bottom plate is an acute angle. In this way, the light reflected at the rising portion is angled based on the angle formed with respect to the bottom plate. By making the angle an acute angle, the light is efficiently guided to the optical member. be able to.
- At least a portion facing the optical member has a first end, a second end located at an end opposite to the first end, and the first end. It is divided into a central portion sandwiched between the second end portions, of which the central portion is the light source placement region, and the first end portion and the second end portion are the light source non-placement regions.
- a pair of the rising portions are provided corresponding to the first end portion and the second end portion.
- the rising portions corresponding to the first end portion and the second end portion, respectively which are light source non-arrangement regions where the amount of light tends to be reduced, the light is more efficiently transmitted. It can lead to an optical member.
- the optical member is configured such that at least a light reflectance on a surface facing the light source side decreases in a direction away from the light source. In this way, the luminance distribution of the illumination light emitted from the optical member can be made smooth from the portion overlapping the light source arrangement region to the portion overlapping the light source non-arrangement region.
- a light reflecting portion that reflects light is formed on a surface of the optical member that faces the light source side. If it does in this way, it will become possible to control the light reflectivity in the light source side surface of an optical member suitably by the mode of a light reflection part.
- the light reflecting portion is substantially dot-shaped in the surface on the light source side of the optical member, and includes a large number of dots having light reflectivity. In this way, it is possible to easily control the light reflectivity according to the dot mode (area, distribution density, etc.).
- the chassis has a rectangular shape when seen in a plan view, and the light source extends along the long side direction of the chassis, and the light source arrangement region and the light source non-arrangement region Are arranged along the short side direction of the chassis. If it does in this way, it will become suitable for using a linear thing as a light source, for example.
- a receiving portion capable of receiving the rising portion from the bottom plate side is provided between the bottom plate and the rising portion. Since the rising portion of the reflection sheet rises from the bottom plate side to the optical member side, the shape tends to become unstable, for example, the rising angle from the bottom plate side fluctuates or deformation such as warping or bending occurs. is there.
- the rising portion can be received from the bottom plate side by the receiving portion, so that the rising portion can be prevented from being displaced to the bottom plate side. Thereby, it is possible to suppress the rising angle of the rising portion from the bottom plate side from being changed, and the rising portion from being deformed such as warping or bending. That is, since the shape of the rising portion can be stably maintained, the directionality of the light reflected there can be stabilized, and unevenness in the light emitted from the lighting device is less likely to occur.
- the light source is a hot cathode tube. In this way, it is possible to increase the brightness.
- the light source is a cold cathode tube. By doing so, it is possible to extend the life and to easily perform light control.
- the light source is an LED. In this way, it is possible to extend the life and reduce power consumption.
- a display device of the present invention includes the above-described illumination device and a display panel that performs display using light from the illumination device.
- the illumination device that supplies light to the display panel is less likely to cause luminance unevenness, it is possible to realize display with excellent display quality.
- a liquid crystal panel can be exemplified as the display panel.
- Such a display device can be applied as a liquid crystal display device to various uses such as a display of a television or a personal computer, and is particularly suitable for a large screen.
- luminance unevenness can be suppressed.
- FIG. 1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention.
- the exploded perspective view which shows schematic structure of the liquid crystal display device with which a television receiver is equipped Sectional drawing which shows the cross-sectional structure along the short side direction of a liquid crystal display device Sectional drawing which shows the cross-sectional structure along the long side direction of a liquid crystal display device.
- the top view which shows arrangement
- Plan view explaining the distribution of light reflectance in the diffuser The principal part enlarged plan view which shows schematic structure of the surface facing a hot cathode tube in a diffuser plate Graph showing the change in light reflectance in the short side direction of the diffuser A graph showing the change in light reflectance in the long side direction of the diffuser The graph showing the luminance distribution about the Y-axis direction of the light emitted from the diffusion plate when the reflective sheet according to the example and each comparative example is used Sectional drawing along the short side direction in the liquid crystal display device using the reflective sheet which concerns on the modification 1 of Embodiment 1.
- FIG. Sectional drawing along the short side direction in the liquid crystal display device using the reflective sheet which concerns on the modification 2 of Embodiment 1.
- FIG. 9 is a graph showing a change in light reflectance in a short side direction of a diffuser plate according to Modification 5 of Embodiment 1.
- the top view which shows the arrangement configuration of the hot cathode tube, the reflective sheet, and the pressing member in the chassis according to the second embodiment of the present invention.
- Xvii-xvii sectional view of FIG. The top view which shows the arrangement configuration of the hot cathode tube and the reflective sheet in the chassis which concerns on Embodiment 3 of this invention.
- FIG. 1 It is the xix-xix sectional view taken on the line of FIG.
- the top view which shows the arrangement structure of the hot cathode tube and reflection sheet in the chassis which concerns on Embodiment 4 of this invention.
- Xxi-xxi sectional view of FIG. Xxii-xxii cross-sectional view of FIG.
- the top view which shows the arrangement configuration of the cold cathode tube, the light source holding member, and the reflection sheet in the chassis according to the fifth embodiment of the present invention.
- Xxiv-xxiv sectional view of FIG. The top view which shows the arrangement configuration of LED and a reflective sheet in the chassis which concerns on Embodiment 6 of this invention.
- FIG. 1 is an exploded perspective view showing a schematic configuration of the television receiver of the present embodiment
- FIG. 2 is an exploded perspective view showing a schematic configuration of a liquid crystal display device included in the television receiver of FIG. 1
- FIG. 3 is a liquid crystal display of FIG. 4 is a cross-sectional view showing a cross-sectional configuration along the short side direction of the device
- FIG. 4 is a cross-sectional view showing a cross-sectional configuration along the long side direction of the liquid crystal display device of FIG. 2
- FIG. 5 is a chassis included in the liquid crystal display device of FIG. It is a top view which shows the arrangement configuration of the hot cathode tube and the reflective sheet.
- the long side direction of the chassis is the X-axis direction
- the short side direction is the Y-axis direction.
- the television receiver TV includes a liquid crystal display device 10, front and back cabinets Ca and Cb that are accommodated so as to sandwich the liquid crystal display device 10, a power source P, a tuner T, And a stand S.
- the liquid crystal display device (display device) 10 has a horizontally long rectangular shape (rectangular shape, longitudinal shape) as a whole and is accommodated in a vertically placed state.
- the liquid crystal display device 10 includes a liquid crystal panel 11 that is a display panel and a backlight device (illumination device) 12 that is an external light source, which are integrated by a frame-like bezel 13 or the like. Is supposed to be retained.
- the screen size is 32 inches and the aspect ratio is 16: 9. More specifically, the horizontal dimension of the screen (dimension in the X-axis direction) is, for example, about 698 mm, and the vertical dimension (Y The dimension in the axial direction is, for example, about 392 mm.
- the liquid crystal panel 11 and the backlight device 12 constituting the liquid crystal display device 10 will be described (see FIGS. 2 to 4).
- the liquid crystal panel (display panel) 11 is configured such that a pair of glass substrates are bonded together with a predetermined gap therebetween, and liquid crystal is sealed between the glass substrates.
- One glass substrate is provided with a switching element (for example, TFT) connected to a source wiring and a gate wiring orthogonal to each other, a pixel electrode connected to the switching element, an alignment film, and the like.
- the other glass substrate is provided with a color filter, a counter electrode, an alignment film, and the like in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement. Yes.
- polarizing plates 11a and 11b are disposed outside both substrates (see FIGS. 3 and 4).
- the backlight device 12 covers the chassis 14 having a substantially box shape having an opening 14 e on the front side (light emitting side, liquid crystal panel 11 side), and the opening 14 e of the chassis 14.
- a frame 16 that holds the long edge of the group of optical members 15 between the optical member 15 and the chassis 14.
- a hot cathode tube 17 that is a light source (linear light source), a socket 18 that relays electrical connection at an end portion of the hot cathode tube 17, an end portion and a socket of the hot cathode tube 17.
- a holder 19 that collectively covers 18.
- a reflection sheet 20 that reflects light is laid in the chassis 14.
- the optical member 15 side is the light emitting side from the hot cathode tube 17.
- the chassis 14 is made of synthetic resin, and as shown in FIGS. 3 and 4, the bottom plate 14a, the side plate 14b rising from the end of each side of the bottom plate 14a, and the rising end of the side plate 14b outward. It is comprised from the overhang
- the bottom plate 14a has a rectangular shape (longitudinal shape) in which the long side direction and the short side direction coincide with the liquid crystal panel 11 and the optical member 15, and the size in plan view is substantially the same as that of the liquid crystal panel 11 and the optical member 15. The formation range is the same. Further, insertion holes for inserting the socket 18 are formed at both ends of the bottom plate 14a in the long side direction.
- a pair of side plates 14b is provided at each of both ends on the long side and both ends on the short side of the bottom plate 14a, and the rising angle from the bottom plate 14a is substantially a right angle.
- the receiving plate 14c is formed for each side plate 14b and has a bending angle with respect to the side plate 14b substantially at right angles, and is parallel to the bottom plate 14a.
- the outer end portions of the reflection sheet 20 and the optical member 15 are placed, and these can be received from the back side.
- a fixing hole 14d is formed in the receiving plate 14c, and the bezel 13, the frame 16, the chassis 14 and the like can be integrated by screws, for example. .
- the reflection sheet 20 is made of synthetic resin (for example, made of foamed PET), and the surface thereof is white with excellent light reflectivity. As shown in FIG. 2, as shown in FIG. And is arranged so as to cover almost the whole area. With this reflection sheet 20, it is possible to reflect the light emitted from the hot cathode tube 17 toward the optical member 15.
- the reflection sheet 20 has a rectangular shape (longitudinal shape) in which the long side direction and the short side direction coincide with the chassis 14 as a whole, and is symmetrical with respect to the short side direction.
- the reflection sheet 20 includes a bottom portion 20a disposed along the bottom plate 14a of the chassis 14, a pair of rising portions 20b rising from the end portion of the bottom portion 20a to the front side (light emitting side, optical member 15 side), and each rising portion 20b. And a pair of extending portions 20c extending outward from the leading end portion (the end portion opposite to the bottom 20a side).
- the bottom portion 20a and the pair of rising portions 20b of the reflection sheet 20 are substantially the same in size as the bottom plate 14a of the chassis 14 as shown in FIGS. It is arranged to overlap.
- the bottom plate 14a of the chassis 14 is formed in a range over the entire area of the bottom 20a and the pair of rising portions 20b in the reflection sheet 20 when viewed in plan. Therefore, it can be said that the formation range of the bottom plate 14a is wider than the case where the bottom plate of the chassis is formed over a range overlapping only the bottom portion 20a.
- a component such as the inverter board 22 is mounted on the back surface of the bottom plate 14a, or a wall-mounted attachment (not shown) for hanging the liquid crystal display device 10 is used. It is possible to attach.
- the bottom 20a is arranged on the center side in the short side direction of the bottom plate 14a of the chassis 14 (position overlapping with the center portion 14C) when viewed in plan, and is parallel to the plate surface of the bottom plate 14a.
- the bottom portion 20a has a rectangular shape (longitudinal shape), and its long side direction is the X-axis direction (the long side direction of the chassis 14, the axial direction of the hot cathode tube 17), and the short side direction is the Y-axis direction (chassis). 14 in the short side direction).
- the long side dimension of the bottom part 20a is substantially the same as the long side dimension of the bottom plate 14a of the chassis 14, whereas the short side dimension of the bottom part 20a is smaller than the short side dimension of the bottom plate 14a. That is, the bottom portion 20a is formed smaller than the bottom plate 14a of the chassis 14 only in the short side direction.
- a pair of rising portions 20b are arranged at positions sandwiching the bottom portion 20a in the short side direction, and both ends of the bottom plate 14a of the chassis 14 in the short side direction (positions overlapping with both end portions 14A and 14B) when viewed in plan. It is arranged in. That is, the pair of rising portions 20b are configured to rise in opposite directions from both ends on the long side of the bottom portion 20a.
- the rising portion 20b has an inclined shape having a certain gradient from the rising base end portion (end portion on the bottom portion 20a side) to the rising tip portion (end portion on the side opposite to the bottom portion 20a side (extension portion 20c side)). ing.
- the plate portion of the rising portion 20b is inclined with respect to both the Y-axis direction and the Z-axis direction, that is, the plate surface of the bottom portion 20a. Accordingly, the space held between the rising portion 20b and the diffusing plate 30 facing it is small toward the direction away from the hot cathode tube 17 in the Y-axis direction (as it goes from the screen center side to the screen end side). It is supposed to be.
- the rising angle ⁇ 1 of the rising portion 20b from the bottom 20a is preferably an acute angle (a size not exceeding 90 degrees), more preferably a size not exceeding 45 degrees. Specifically, for example, it is about 20 to 30 degrees.
- the rising portion 20b rises while being separated from the bottom plate 14a.
- a gap is provided between the base plate 14a and the bottom plate 14a, and the gap gradually increases from the rising proximal end side to the rising distal end side. That is, the rising portion 20b is in a state of floating to the front side with a gap between the rising portion 20b and the bottom plate 14a.
- the gap has a substantially triangular shape when viewed from the side (FIG. 3).
- the rising portion 20b has a rectangular shape (longitudinal shape) when viewed in plan, and the long side direction and the short side direction are the same as the bottom portion 20a.
- the long side dimension of the rising part 20b is substantially the same as the long side dimension of the bottom plate 14a of the chassis 14, whereas the short side dimension of the rising part 20b is smaller than the short side dimension of the bottom plate 14a.
- both the rising parts 20b are formed smaller than the bottom plate 14a of the chassis 14 only in the short side direction.
- the area (length dimension in the Y-axis direction) of each rising part 20b is larger than the area (length dimension in the Y-axis direction) of the bottom part 20a.
- the extending portion 20c extends outward from the rising tip portion of each rising portion 20b, and is arranged so as to overlap with each receiving plate 14c in the chassis 14 in a plan view.
- the extending portion 20c is configured to be parallel to the plate surface of the bottom portion 20a (the bottom plate 14a and the receiving plate 14c), and is placed on the front side surface of the receiving plate 14c.
- the extending portion 20 c is sandwiched between the receiving plate 14 c and the outer edge portion of the diffusion plate 30.
- the optical member 15 has a horizontally long rectangular shape (rectangular shape) in a plan view, like the liquid crystal panel 11 and the chassis 14.
- the optical member 15 is interposed between the liquid crystal panel 11 and the hot cathode tube 17, and has a diffusion plate 30 disposed on the back side (the hot cathode tube 17 side, opposite to the light emitting side), and the front side (liquid crystal). And an optical sheet 31 disposed on the panel 11 side and the light emitting side.
- the diffusion plate 30 has a structure in which a large number of diffusion particles are dispersed in a substantially transparent resin base material having a predetermined thickness, and has a function of diffusing transmitted light. It also has a light reflection function for reflecting the light emitted from the cathode tube 17.
- the optical sheet 31 has a sheet shape that is thinner than the diffusion plate 30, and three optical sheets 31 are laminated. Specifically, the optical sheet 31 is a diffusion sheet, a lens sheet, and a reflective polarizing sheet in order from the diffusion plate 30 side (back side).
- the hot cathode tube 17 is tubular (linear) as a whole, and includes a hollow glass tube 17a and a pair of electrodes 17b arranged at both ends of the glass tube 17a.
- the glass tube 17a is filled with mercury, a rare gas and the like, and a fluorescent material is applied to the inner wall surface thereof.
- the light emitting surface ES in the hot cathode tube 17 is the outer peripheral surface of the glass tube 17a, and can emit light radially from the axis.
- Each electrode 17b includes a filament and a pair of terminals connected to both ends of the filament.
- Sockets 18 are fitted on both ends of the hot cathode tube 17, and the terminals are connected to the inverter board 22 attached to the outer surface side (back surface side) of the bottom plate 14 a of the chassis 14 via the socket 18.
- the hot cathode tube 17 is supplied with driving power from the inverter board 22 and can control the tube current value, that is, the luminance (lighting state) by the inverter board 22.
- the hot cathode tube 17 is interposed between the diffusion plate 30 and the bottom plate 14 a (reflection sheet 20) of the chassis 14, and is disposed closer to the bottom plate 14 a of the chassis 14 than the diffusion plate 30.
- the outer diameter of the hot cathode tube 17 is larger than the outer diameter of the cold cathode tube (for example, about 4 mm), for example, about 15.5 mm.
- the hot cathode tube 17 As shown in FIG. 5, only one hot cathode tube 17 having the above-described structure is accommodated in the chassis 14 with its length direction (axial direction) coinciding with the long side direction of the chassis 14. However, the position is approximately the center of the chassis 14 in the short side direction. Specifically, the bottom plate 14a of the chassis 14 (the part facing the optical member 15 and the hot cathode tube 17) is opposite to the first end 14A in the short side direction (Y-axis direction) and the first end 14A. When divided into a second end portion 14B located at the end on the side and a central portion 14C sandwiched between them, the hot cathode tube 17 is disposed in the central portion 14C, and a light source arrangement area LA is formed here. Yes.
- the hot cathode tube 17 is not disposed at the first end portion 14A and the second end portion 14B of the bottom plate 14a, and a light source non-arrangement region LN is formed here. That is, the hot cathode tube 17 forms the light source arrangement area LA in a form unevenly distributed at the center portion 14C in the short side direction of the bottom plate 14a of the chassis 14, and the area of the light source arrangement area LA (the length in the Y-axis direction). The dimension) is smaller than the area of the light source non-arrangement region LN (the length dimension in the Y-axis direction).
- the ratio of the area (the length dimension in the Y-axis direction) of the light source arrangement region LA to the area of the entire screen (the vertical dimension (short side dimension) of the screen) is, for example, about 4%.
- the pair of light source non-arrangement regions LN have substantially the same area.
- the central portion 14C (light source arrangement area LA) of the chassis 14 a part of the bottom portion 20a (specifically, the central portion in the short side direction) of the reflection sheet 20 overlaps with the first end as viewed in plan.
- the part 14A and the second end part 14B (light source non-arrangement region LN) include a part of the bottom part 20a (specifically, both end parts in the short side direction) and the rising parts 20b of the reflection sheet 20 in plan view. Superimposed.
- the main part of the bottom 20a is arranged in the light source arrangement area LA, while a part of both ends of the bottom 20a and the entire area of both rising parts 20b are arranged in the light source non-arrangement area LN. It is arranged.
- the hot cathode tube 17 is formed so that its length dimension is substantially equal to the horizontal dimension (long side dimension) of the screen.
- the holder 19 that covers the end portion of the hot cathode tube 17 and the socket 18 is made of a synthetic resin that exhibits white color, and as illustrated in FIG. 2, has a long and narrow box shape that extends along the short side direction of the chassis 14. .
- the holder 19 has a stepped surface on the surface side where the optical member 15 or the liquid crystal panel 11 can be placed in steps, and a part of the receiving plate 14 c in the short side direction of the chassis 14. They are arranged in a superposed state, and form the side wall of the backlight device 12 together with the receiving plate 14c.
- An insertion pin 23 protrudes from a surface of the holder 19 facing the receiving plate 14c of the chassis 14, and the insertion pin 23 is inserted into an insertion hole 24 formed on the upper surface of the receiving plate 14c of the chassis 14.
- the holder 19 is attached to the chassis 14.
- FIG. 6 is a plan view for explaining the distribution of light reflectance in the diffusion plate
- FIG. 7 is an enlarged plan view of the main part showing a schematic configuration of the surface of the diffusion plate in FIG. 6 facing the hot cathode tube
- FIG. 9 is a graph showing the change in light reflectance in the long side direction of the diffusion plate in FIG. 6.
- FIG. 9 is a graph showing the change in light reflectance in the short side direction of the diffusion plate. 8 and 9, the long side direction of the diffusion plate is the X-axis direction, and the short side direction is the Y-axis direction. Further, in FIG.
- the horizontal axis indicates the Y-axis direction (short side direction), and is a graph plotting the light reflectance from the front side end portion to the back side end portion shown in FIG. 6 along the Y-axis direction. It has become.
- the horizontal axis indicates the X-axis direction (long-side direction), and a graph plotting the light reflectance from the left end to the right end shown in FIG. 6 along the Y-axis direction. It has become.
- the diffusing plate 30 is formed by dispersing and blending a predetermined amount of diffusing particles for diffusing light in a substantially transparent synthetic resin (for example, polystyrene) base material, and the light transmittance and light reflectance are substantially uniform throughout. Is done.
- the specific light transmittance and light reflectance in the base material of the diffusion plate 30 (excluding the light reflecting portion 32 described later) are, for example, about 70% light transmittance and 30% light reflectance. It is preferable to be set to a degree.
- the diffusion plate 30 is positioned on the opposite side of the surface facing the hot cathode tube 17 (hereinafter referred to as the first surface 30a) and the first surface 30a (hereinafter referred to as the second surface). Surface 30b).
- the first surface 30 a is a light incident surface on which light from the hot cathode tube 17 is incident, whereas the second surface 30 b emits light (illumination light) toward the liquid crystal panel 11.
- the light reflection part 32 which makes the dot pattern which exhibits white is formed.
- the light reflecting portion 32 is configured by arranging a plurality of dots 32a having a round shape in plan view in a zigzag shape (staggered shape, staggered shape).
- the dot pattern which comprises the light reflection part 32 is formed by printing the paste containing the metal oxide on the surface of the diffusion plate 30, for example.
- the printing means screen printing, ink jet printing and the like are suitable.
- the light reflecting portion 32 has a light reflectance higher than that of the light reflection portion 32 itself, for example, about 75%, and the light reflectance within the surface of the diffusion plate 30 itself is about 30%. It is supposed to be.
- the light reflectance of each material is the average light reflectance within the measurement diameter measured by LAV (measurement diameter ⁇ 25.4 mm) of CM-3700d manufactured by Konica Minolta.
- the light reflectivity of the light reflection part 32 itself is the value which formed the said light reflection part 32 over the whole surface of a glass substrate, and measured the formation surface based on the said measurement means.
- the diffusing plate 30 has a long side direction (X-axis direction) and a short side direction (Y-axis direction). By changing the dot pattern of the light reflecting portion 32, the diffusing plate 30 is connected to the hot cathode tube 17 of the diffusing plate 30.
- the light reflectance of the opposing first surface 30a is assumed to change along the short side direction as shown in FIG. 8 (see FIG. 6). That is, as shown in FIG. 6, the diffuser plate 30 has a light reflectivity of a portion overlapping the hot cathode tube 17 (hereinafter referred to as a light source overlapping portion DA) on the first surface 30 a as a whole.
- the light reflectance of the 1st surface 30a in the diffusing plate 30 hardly changes along a long side direction, and is made substantially constant (refer FIG. 6).
- the light reflectance distribution in the diffusion plate 30 will be described in detail.
- the light reflectivity of the diffusion plate 30 is continuously small in the direction away from the hot cathode tube 17 along the short side direction (Y-axis direction).
- the distribution is continuously increased toward the approaching direction, and the distribution is set to take a normal distribution (a hanging curve).
- the light reflectance of the diffusing plate 30 is maximized at the center position in the short side direction (position coincident with the center of the hot cathode tube 17) and is minimized at both end positions in the short side direction.
- the maximum value of the light reflectance is, for example, about 65%
- the minimum value is, for example, about 30%, which is equivalent to the light reflectance of the diffusion plate 30 itself.
- the light reflecting portions 32 are arranged only slightly or almost at the both end positions in the short side direction of the diffusion plate 30.
- an area exceeding the half value obtained by subtracting the minimum value from the maximum value in the light reflectance (for example, about 47.5%) is a half width area HW.
- the width dimension of the half width region HW is set to the half width. That is, when the maximum value of the light reflectance is Rmax and the minimum value is Rmin, the region having the light reflectance Ra that satisfies the following expression (2) in the diffuser plate 30 is set as the half-width region HW. .
- a region outside the region HW is a non-half-width region NHW. That is, when the maximum value of the light reflectivity is Rmax and the minimum value is Rmin, the region having the light reflectivity Rb that satisfies the following expression (3) in the diffusion plate 30 is defined as the non-half width region NHW.
- the A pair of the non-half-width regions NHW are arranged at positions on the diffusion plate 30 with the half-width region HW interposed therebetween.
- the ratio of the half width with respect to the short side dimension of the diffusion plate 30 according to the present embodiment is, for example, about 60%. That is, about 60% of the region on the center side in the short side direction of the diffusing plate 30 is a half width region HW, and about 20% of the region on both sides in the short side direction of the diffusing plate 30 is a non-half width region. NHW.
- the full width at half maximum HW includes a whole area of the light source arrangement area LA (light source overlapping part DA) and a predetermined area adjacent to the light source arrangement area LA in each light source non-arrangement area LN (each light source non-overlapping part DN). And are included.
- the full width at half maximum HW includes a region slightly over half of each light source non-arrangement region LN, and the ratio of the diffusion plate 30 to the short side dimension is, for example, about 28%.
- the non-half-value width region NHW includes a predetermined region of each light source non-arrangement region LN that is closer to the end of the diffuser plate 30 (region opposite to the light source arrangement region LA side).
- the non-half-width region NHW includes a little less than half of each light source non-arrangement region LN, and the ratio of the diffusion plate 30 to the short side dimension is, for example, 20 as described above. %.
- the half width region HW described above can be said to be a high reflectance region having a relatively high light reflectance compared to the non-half width region NHW, and when turned upside down, the non-half width region NHW has a relatively light reflectance. It can be said that this is a low low reflectance region.
- the light reflecting portion 32 is formed as follows. That is, the area of each dot 32a constituting the light reflecting portion 32 is the largest at the center position in the short side direction of the diffusing plate 30, that is, the center position of the hot cathode tube 17, and toward the direction away from it. The size gradually becomes smaller, and the one arranged closest to the end in the short side direction in the diffusion plate 30 is minimized. That is, the area of each dot 32a is set to be smaller as the distance from the center of the hot cathode tube 17 is larger.
- the luminance distribution of the illumination light can be made smooth as the entire diffusing plate 30, and as a result, the gentle illumination luminance distribution can be realized as the entire backlight device 12.
- the area of each dot 32a of the light reflecting portion 32 may be the same, and the interval between the dots 32a may be changed.
- the reflection sheet 20 is arranged as follows, corresponding to the diffusion plate 30 having the optical design as described above. That is, as shown in FIGS. 3 and 5, the rising portion 20 b of the reflection sheet 20 has a rising base end position BP from the bottom portion 20 a that overlaps the half width region HW of the diffuser plate 30, and the rising leading end position EP is not non-existent. They are arranged so as to overlap with the half width region NHW, that is, not to overlap with the half width region HW. With such an arrangement, the rising portion 20b is arranged so as to straddle the boundary position between the half-value width region HW and the non-half-value width region NHW in the diffusion plate 30.
- the rising base end position BP in the rising portion 20b is a position closer to the hot cathode tube 17 (center of the screen) than the boundary position between the half-value width region HW and the non-half-value width region NHW in the diffusion plate 30 and has a half-value width.
- the arrangement overlaps with the area HW.
- the rising tip position EP in the rising portion 20b is a position closer to the screen end (opposite to the hot cathode tube 17 side) than the boundary position between the half width region HW and the non-half width region NHW in the diffusion plate 30.
- it is arranged so as to overlap with the non-half width region NHW.
- the rising portion 20b is formed over a range extending over a part of the half-value width region HW (an end portion on the non-half-value width region NHW side) and almost the entire region of the non-half-value width region NHW.
- the short side dimension W1 (dimension in the Y-axis direction) at the bottom portion 20a is smaller than the width dimension (dimension in the Y-axis direction) in the full width at half maximum HW. Specifically, the short side dimension in the bottom portion 20a is about 60% of the width dimension in the half width region HW and about 40% of the short side dimension in the entire chassis 14.
- the short side dimension W2 (dimension in the Y-axis direction) at each rising portion 20b is larger than the width dimension (dimension in the Y-axis direction) in each non-half width region NHW. Specifically, the short side dimension of each rising portion 20b is about 30% of the short side dimension of the entire chassis 14.
- the bottom portion 20a is arranged so as to overlap with a central region of about 60% in the full width at half maximum HW, while each rising portion 20b has an area of about 20% at both ends in the full width at half maximum HW. They are arranged so as to overlap each other and to overlap each of the entire non-half-value width regions NHW.
- the rising base end position BP in the rising portion 20b is arranged in a position that does not overlap the hot cathode tube 17 in the half width region HW, that is, in the light source non-arrangement region LN.
- the bottom portion 20a is disposed across the entire light source arrangement region LA and a part of both light source non-arrangement regions LN (ends near the light source arrangement region LA), and each rising portion 20b includes each light source It is arranged corresponding to the remaining part of the non-arrangement region LN.
- the bottom portion 20a is opposed to the light emitting surface ES of the hot cathode tube 17 in the Z-axis direction in the light source arrangement region LA.
- this bottom part 20a is a form parallel to the bottom plate 14a, it is easy to fix the socket 18 necessary for attaching the hot cathode tube 17 to the chassis 14 to the bottom plate 14a.
- the rising tip position EP in the rising portion 20b is arranged in a position overlapping with the end portion in the short side direction of the diffusion plate 30 in the non-half-value width region NHW, and arranged in the light source non-arrangement region LN. Yes.
- This embodiment has the structure as described above, and its operation will be described next.
- the hot cathode tube 17 When the hot cathode tube 17 is turned on when using the liquid crystal display device 10, the light emitted from the hot cathode tube 17 is arranged directly on the first surface 30 a of the diffusion plate 30 or in the chassis 14. After being reflected by each member (the holder 19, the reflection sheet 20, etc.), the light is incident indirectly, passes through the diffusion plate 30, and then is emitted toward the liquid crystal panel 11 through the optical sheet 31.
- the light reflection function of the diffusion plate 30 will be described in detail.
- the direct light from the hot cathode tube 17 is much, and the light amount is relatively larger than that of the light source non-overlapping portion DN. Therefore, by relatively increasing the light reflectance of the light reflecting portion 32 in the light source overlapping portion DA (see FIGS.
- the direct light from the hot cathode tube 17 is less and the light amount is relatively smaller than that of the light source overlapping portion DA. Therefore, by making the light reflectance of the light reflecting portion 32 relatively small in the light source non-overlapping portion DN (see FIGS. 6 and 8), it is possible to promote the incidence of light on the first surface 30a.
- the light amount is supplemented. A sufficient amount of light incident on the non-overlapping portion DN can be secured.
- the amount of light in the chassis 14 can be made uniform to some extent, but it is difficult to make it completely uniform.
- the amount of light in the chassis 14 tends to be smaller than the light source non-arrangement region LN.
- the amount of light supplied to the diffusion plate 30 tends to be relatively smaller in the non-half-value width region NHW in the diffusion plate 30 than in the half-value width region HW. Therefore, in the present embodiment, the light quantity supplied to the diffusion plate 30 is made uniform by devising the shape and arrangement of the reflection sheet 20.
- the rising portion 20 b of the reflection sheet 20 is configured to rise from the bottom 20 a to the front side, so that it rises from the rising proximal end side to the rising distal end side (in a direction away from the hot cathode tube 17).
- the space between the diffuser plate 30, that is, the space in which light travels within the chassis 14 is narrow, and the optical path length from the rising portion 20 b to the diffuser plate 30 is short.
- the amount of light in the chassis 14 tends to be almost inversely proportional to the distance from the hot cathode tube 17, and the light source non-arrangement region LN tends to be smaller than the light source arrangement region LA.
- a dark part is easily generated in the arrangement region LN.
- the space itself where light rises and falls is narrowed by the rising portion 20b, and the optical path length to the diffusion plate 30 is short.
- Light can be efficiently guided to the diffusion plate 30.
- the light quantity supplied to the diffusing plate 30 in the light source non-arrangement region LN can be sufficiently supplemented, so that the light source non-arrangement region LN is hardly recognized as a dark part.
- the rising portion 20b is configured such that the rising base end position BP from the bottom portion 20a overlaps with the half width region HW in the diffusion plate 30, and the rising tip position EP overlaps with the non-half width region NHW in the diffusion plate 30.
- the rising portion 20b is arranged so as to straddle the half width region HW and the non-half width region NHW. Therefore, light can be efficiently guided to the diffuser plate 30 by the rising portion 20b even at the boundary position between the half width region HW and the non-half width region NHW.
- the rising portion is at the boundary position between the half width region HW and the non-half width region NHW. It doesn't exist and there is a bottom. For this reason, at the boundary position, the optical path length from the bottom to the diffusion plate 30 becomes longer than the optical path length from the rising portion to the diffusion plate 30, and the amount of light supplied to the diffusion plate 30. Will decrease locally.
- the bottom portion 20a does not exist at the boundary position between the half width region HW and the non-half width region NHW, and light can be efficiently guided to the diffuser plate 30 by the rising portion 20b. Therefore, it is possible to avoid a situation in which the amount of light supplied to the diffusion plate 30 is locally reduced. As a result, a difference in the amount of light supplied between the half-value width region HW and the non-half-value width region NHW and the amount of light emitted in the diffuser plate 30 are less likely to occur, and thus unevenness in brightness is less likely to occur in the illumination light.
- FIG. 10 is a graph showing the luminance distribution in the Y-axis direction of the light emitted from the diffuser plate when the reflective sheet according to the example and each comparative example is used, and the vertical axis indicates the maximum luminance of 100%.
- the horizontal axis indicates the position in the Y-axis direction on the diffusion plate (see FIG. 3).
- the short side dimension at the bottom is smaller than the dimension at the full width at half maximum, and the rising angle at the rising part is about 20 degrees.
- the short side dimension at the bottom is slightly larger than the dimension at the full width at half maximum, and the rising angle at the rising part is about 30 degrees.
- the short side dimension of the bottom part is larger than the dimension of the full width at half maximum, and the rising angle at the rising part is about 45 degrees.
- the short side dimension of the bottom part is considerably larger than the dimension of the full width at half maximum, and the rising angle at the rising part is about 60 degrees.
- the use of the reflective sheet 20 of the example can prevent uneven brightness.
- luminance unevenness is visually recognized. This is because in Comparative Examples 1 to 3, a part of the bottom portion is arranged so as to overlap with the non-half-width region NHW, so that the overlapping portion between the bottom portion and the non-half-width region NHW is another portion (half-value width). This is probably because the region HW and the non-half-value width region NHW are more likely to be visually recognized as a local dark portion as compared with the portion overlapping the rising portion).
- the bottom portion 20a does not exist at a position where it overlaps with the non-half width region NHW, and only the rising portion 20b overlaps with the non-half width region NHW.
- Light can be efficiently guided to the entire half width region NHW, and a difference in the amount of light supplied between the half width region HW and the non-half width region NHW can be made difficult to occur. Thereby, luminance unevenness is difficult to be visually recognized.
- the backlight device 12 of the present embodiment includes the hot cathode tube 17 as a light source and the bottom plate 14a disposed on the opposite side of the light emitting side with respect to the hot cathode tube 17 and the hot cathode tube.
- a chassis 14 that houses the light source 17, a diffusion plate 30 that is an optical member disposed on the light emitting side with respect to the hot cathode tube 17, and a rise that is disposed in the chassis 14 and rises from the bottom plate 14 a side to the diffusion plate 30 side.
- the chassis 14 includes a light source arrangement area LA in which the hot cathode tube 17 is disposed, and a hot cathode tube 17.
- the diffuser plate 30 is divided into light source non-arrangement regions LN that are not arranged, whereas the diffuser plate 30 is a first surface that faces at least the hot cathode tube 17 side in a portion that overlaps the light source arrangement region LA (light source overlap portion DA). 3
- the light reflectance of a is larger than the light reflectance of the first surface 30a facing at least the hot cathode tube 17 side in the portion (light source non-overlapping portion DN) that overlaps the light source non-arrangement region LN.
- the rising base end position BP of the rising portion 20b of the reflection sheet 20 is defined as Rmax, where Rmax is the maximum value of the light reflectance at least on the first surface 30a facing the hot cathode tube 17 side of the diffusion plate 30 and Rmin. Is overlapped with a region (half width region HW) having a light reflectance R satisfying the following formula (4) in the diffusing plate 30 and the rising tip position EP of the rising portion 20b is expressed by the following formula ( It is arranged so as not to overlap with a region (half width region HW) having a light reflectance R that satisfies 4).
- the light emitted from the hot cathode tube 17 first reaches a portion of the diffuser plate 30 having a relatively high light reflectivity, so that most of the light is reflected (that is, not transmitted).
- the luminance of illumination light is suppressed with respect to the amount of light emitted from the hot cathode tube 17.
- the light reflected here can be reflected by the reflection sheet 20 in the chassis 14 and reach the light source non-arrangement region LN. Since the portion of the diffuser plate 30 that overlaps the light source non-arrangement region LN has a relatively low light reflectance, more light is transmitted, and the luminance of predetermined illumination light can be obtained.
- the amount of light in the chassis 14 is uniformed to some extent by setting the light reflectivity at the diffuser plate 30 as described above, but it is difficult to be completely uniform, and the light source non-arrangement region LN However, the amount of light tends to be smaller than that of the light source arrangement area LA. Therefore, the amount of light supplied to the diffusing plate 30 has a light reflectance R satisfying the equation (4) in a region (non-half-value width region NHW) having a light reflectance that does not satisfy the above equation (4) in the diffusing plate 30. Compared to the area (half-width area HW), it tends to be relatively small.
- the reflection sheet 20 that reflects light in the chassis 14 has a rising portion 20b that rises from the bottom plate 14a side of the chassis 14 to the diffusion plate 30 side, the diffusion plate Since the distance held between the light source 30 and the light source 30 is narrow and the optical path length to the light diffuser plate 30 is short, the light can be efficiently guided to the light diffuser plate 30. That is, it is possible to supplement the amount of light supplied to the diffusion plate 30 by the rising portion 20b.
- the rising portion is It does not exist at the boundary position between the region having the light reflectance R satisfying the above formula (4) (half width region HW) and the region having the light reflectance not satisfying the above formula (4) (non-half width region NHW). For this reason, there is a possibility that the amount of light supplied to the diffusion plate 30 is locally reduced in the vicinity of the boundary position, resulting in a local dark portion.
- the rising base end position BP of the rising portion 20b is overlapped with a region (half width region HW) having a light reflectance R that satisfies the above formula (4) in the diffusion plate 30, and the rising portion 20b.
- the region is arranged across the boundary position between the region having the light reflectance R that satisfies (half width region HW) and the region having the light reflectance that does not satisfy the above formula (4) (non-half width region NHW).
- the light can be efficiently guided to the diffusion plate 30 by the rising portion 20b even in the vicinity of the boundary position, and a situation in which the amount of light supplied to the diffusion plate 30 is locally reduced can be avoided. it can.
- the region (half width region HW) having the light reflectance R satisfying the above formula (4) in the diffusion plate 30 and the region having the light reflectance not satisfying the above formula (4) non-half width region NHW.
- the reflection sheet 20 has a bottom portion 20a that is arranged along the bottom plate 14a and at least a part of which is arranged in the light source arrangement area LA, and the rising portion 20b rises from the bottom portion 20a to the diffusion plate 30 side. It is in the form.
- the portion of the reflection sheet 20 that is disposed corresponding to the light source arrangement area LA is interposed between the hot cathode tube 17 and the bottom plate 14a of the chassis 14, and therefore the portion has a complicated shape. In this case, for example, there is a possibility of hindering the installation of the hot cathode tube 17.
- the reflective sheet 20 is disposed in the light source arrangement region LA at least at a part of the bottom 20a disposed along the bottom plate 14a. It becomes difficult for the reflection sheet 20 to obstruct the installation.
- the rising base end position BP from the bottom 20a in the rising portion 20b is arranged in the light source non-arrangement region LN. In this way, since the bottom portion 20a is disposed over the entire light source arrangement region LA, it is possible to reliably prevent the reflection sheet 20 from being obstructed when the hot cathode tube 17 is installed, for example.
- the hot cathode tube 17 has a light emitting surface ES that emits light, and the bottom portion 20a is arranged to face the light emitting surface ES.
- the optical path length from the light emitting surface ES of the hot cathode tube 17 to the reflection sheet 20 in the light source arrangement region LA is compared with the case where the rising base end position BP in the rising portion 20b is arranged in the light source arrangement region LA.
- a side plate 14b that rises toward the light emitting side is provided at the end of the bottom plate 14a, and a receiving plate 14c that protrudes outward is provided at the rising end of the side plate 14b, whereas a rising portion An extending portion 20c extending along the receiving plate 14c is provided at the leading end portion of 20b.
- the bottom portion 20a of the reflection sheet 20 is disposed along the bottom plate 14a and the extending portion 20c is disposed along the receiving plate 14c. Therefore, the rising portion 20b positioned between the bottom portion 20a and the extending portion 20c. It becomes possible to stabilize the shape.
- the rising portion 20 b is formed so that the interval held between the rising plate 20 b and the diffusion plate 30 decreases toward the direction away from the hot cathode tube 17.
- the amount of light in the chassis 14 tends to decrease as the distance from the hot cathode tube 17 increases.
- the optical path length from the rising portion 20b to the diffusion plate 30 can be increased to the chassis. 14 tends to be proportional to the amount of light in 14. As the optical path length becomes shorter, the light can be guided to the diffusion plate 30 more efficiently, so that the light can be guided to the diffusion plate 30 without unevenness by the rising portion 20b as described above.
- the rising portion 20b is inclined. In this way, the light can be efficiently reflected to the diffusion plate 30 by the rising portion 20b having an inclined shape.
- the angle formed by the rising portion 20b with respect to the bottom plate 14a is an acute angle.
- the light reflected by the rising portion 20b is angled based on the angle formed with respect to the bottom plate 14a.
- the angle By making the angle an acute angle, the light is efficiently transmitted to the diffusion plate 30. Can be guided.
- the chassis 14 has at least the first end portion 14A, the second end portion 14B located at the end opposite to the first end portion 14A, and the first end portion 14A at a portion facing the diffusion plate 30. And a central portion 14C sandwiched between the second end portion 14B, of which the central portion 14C is a light source placement region LA, and the first end portion 14A and the second end portion 14B are light source non-placement regions LN. It is said. In this way, sufficient luminance can be secured in the central portion of the backlight device 12, and the luminance of the display central portion can be secured also in the liquid crystal display device 10 including the backlight device 12. Therefore, good visibility can be obtained.
- a pair of rising portions 20b are provided corresponding to the first end portion 14A and the second end portion 14B.
- the rising portions 20b corresponding to the first end portion 14A and the second end portion 14B, respectively, which are light source non-arrangement regions LN that tend to reduce the amount of light light can be transmitted. It can lead to the diffusion plate 30 more efficiently.
- the diffuser plate 30 is configured such that at least the light reflectance at the first surface 30a facing the hot cathode tube 17 side decreases toward the direction away from the hot cathode tube 17. In this way, the luminance distribution of the illumination light emitted from the diffuser plate 30 can be made smooth from the portion overlapping the light source arrangement region LA to the portion overlapping the light source non-arrangement region LN.
- a light reflecting portion 32 that reflects light is formed on the first surface 30a of the diffusion plate 30 facing the hot cathode tube 17 side. In this way, the light reflectance on the surface of the diffusion plate 30 on the hot cathode tube 17 side can be appropriately controlled by the mode of the light reflecting portion 32.
- the light reflecting portion is substantially dotted in the surface of the diffusion plate 30 on the hot cathode tube 17 side, and is composed of a large number of dots 32a having light reflectivity. In this way, the light reflectance can be easily controlled by the mode (area, distribution density, etc.) of the dots 32a.
- the chassis 14 has a rectangular shape in plan view, and the hot cathode tube 17 extends along the long side direction of the chassis 14, and the light source arrangement area LA and the light source non-arrangement area LN. Are arranged along the short side direction of the chassis 14. If it does in this way, it will become suitable for using a linear thing as a light source, for example.
- the light source is a hot cathode tube 17. In this way, it is possible to increase the brightness.
- Embodiment 1 of this invention was shown, this invention is not restricted to the said embodiment, For example, the following modifications can also be included.
- members similar to those in the above embodiment are denoted by the same reference numerals as those in the above embodiment, and illustration and description thereof may be omitted.
- FIG. 11 is sectional drawing along the short side direction in the liquid crystal display device using the reflective sheet which concerns on this modification.
- the rising portion 20 b-1 has a substantially arc shape (bow shape) as a cross-sectional shape cut along the Y-axis direction. Specifically, the rising portion 20b-1 has a substantially arc shape that warps to the back side, and the entire rising portion 20b-1 is disposed by being retracted to the bottom plate 14a side from a line (string) connecting the rising base end and the rising tip.
- the rising portion 20b-1 has substantially the same rising angle from the bottom portion 20a as in the first embodiment. This rising angle is an angle formed by a tangent at the rising base end of the rising portion 20b-1 with respect to the bottom portion 20a.
- the rising portion 20b-1 has an arc shape. In this way, light can be efficiently reflected to the diffusion plate 30 by the rising portion 20b-1 having an arc shape.
- FIG. 12 is a cross-sectional view taken along the short side direction in the liquid crystal display device using the reflective sheet according to this modification.
- the bottom portion shown in the first embodiment is omitted. That is, the reflection sheet 20-2 includes a pair of rising portions 20b-2 rising from the bottom plate 14a side of the chassis 14 to the diffusion plate 30 side, and a pair of extensions extending from the rising tip portions of the rising portions 20b-2. Part 20c-2.
- the two rising portions 20b-2 have a substantially V-shaped cross section cut along the Y-axis direction.
- the rising base end position BP-2 in the rising portion 20b-2 is common and is substantially the same position as the center in the hot cathode tube 17 in the Y-axis direction.
- the rising base end position BP-2 in the rising portion 20b-2 is a position overlapping the half width region HW in the diffusion plate 30, and is in the light source arrangement region LA. According to such a configuration, light can be efficiently supplied from the half-value width region HW to the non-half-value width region NHW in the diffusion plate 30 by the rising portion 20b-2, which is suitable for suppressing luminance unevenness.
- FIG. 13 is a cross-sectional view taken along the short side direction of the liquid crystal display device using the reflective sheet according to this modification.
- the rising portion 20 b-3 has a substantially arc shape (bow shape) as a cross-sectional shape cut along the Y-axis direction. Specifically, the rising portion 20b-3 has a substantially arc shape that warps to the back side, and the entire rising portion 20b-3 is disposed by being retracted to the bottom plate 14a side from a line (string) connecting the rising base end and the rising tip.
- the rising base end position BP-3 of both rising portions 20b-3 is a position overlapping the half-value width region HW on the diffusion plate, and is in the light source arrangement region LA.
- FIG. 14 is a graph showing a change in light reflectance in the short side direction of the diffusion plate according to this modification.
- the light reflectance is substantially uniform, for example, 65%, and shows the maximum value in the diffusing plate 30.
- the light reflectance decreases gradually and gradually from the side closer to the light source overlapping portion DA toward the far side (changes in a slope shape), and the short side direction ( It is 30% of the minimum value at both ends in the Y-axis direction).
- the dots 32a constituting the light reflecting portion 32 have the maximum area and are the same in the light source overlapping portion DA, whereas in the light source non-overlapping portion DN, they are inversely proportional to the distance from the light source overlapping portion DA. Thus, it is formed so as to become gradually smaller gradually.
- FIG. 15 is a graph showing a change in light reflectance in the short side direction of the diffusion plate according to this modification.
- the light reflecting portion 32 is formed so that the light reflectance in the first surface 30 a of the diffusion plate 30 gradually decreases stepwise from the light source overlapping portion DA to the light source non-superimposing portion DN. Yes. That is, the area (light reflectivity) of each dot 32a constituting the light reflecting portion 32 is the largest and uniform in the light source overlapping portion DA, but is predetermined in a direction away from the light source overlapping portion DA. Each region gradually decreases in size, and is the smallest at both ends in the short side direction (Y-axis direction) of the diffusion plate 30.
- the light reflectance changes in a stripe shape along the short side direction (Y-axis direction) of the diffusion plate 30.
- the luminance distribution of the illumination light emitted from the diffusion plate 30 can be made smooth.
- the manufacturing method of the diffusion plate 30 becomes simple and can contribute to cost reduction.
- FIG. 16 is a plan view showing the arrangement configuration of the hot cathode tube, the reflection sheet, and the pressing member in the chassis
- FIG. 17 is a sectional view taken along the line xvii-xvii of FIG.
- the holding member 40 is made of a synthetic resin (for example, made of polycarbonate), and the entire surface has a white color such as white having excellent light reflectivity.
- three pressing members 40 are intermittently arranged in parallel at positions spaced apart in the long side direction in the chassis 14. Specifically, each pressing member 40 is arranged at a substantially central position in the short side direction in the chassis 14, whereas in the long side direction in the chassis 14, the holding members 40 are arranged at a substantially central position and positions near both ends. Each is distributed.
- the pressing member 40 has a main body 41 having a pressing surface 44 that presses the reflection sheet 20 from the front side (light emission side), and protrudes from the main body 41 to the front side (light emission side) and diffuser plate 30 and a mounting portion 43 that protrudes from the main body portion 41 to the back side (opposite to the light emitting side, the bottom plate 14a side of the chassis 14) and can attach the pressing member 40 to the chassis 14.
- the main body portion 41 has a rectangular shape (longitudinal shape) when viewed in a plan view, and the long side direction thereof coincides with the Y-axis direction (short side direction in the chassis 14 and the reflection sheet 20), and the short side direction is set.
- the main body 41 has a bent shape as viewed from the side, following the outer shape of the central portion (the portion straddling the bottom 20a and both rising portions 20b) in the short side direction of the reflective sheet 20.
- the main body 41 has a symmetrical shape with the central position in the long side direction (between both rising portions 20b) as the center.
- the central portion of the main body portion 41 in the long side direction is a bottom pressing portion 41a having a bottom pressing surface 44a that overlaps with the bottom portion 20a in a plan view and can press the bottom portion 20a from the front side.
- both ends in the long side direction of the main body portion 41 are configured to rise from the bottom pressing portion 41a toward the front side, overlap with both rising portions 20b when viewed in a plan view, and hold both rising portions 20b from the front side.
- the rising portion pressing portion 41b has a possible rising portion pressing surface 44b.
- the bottom pressing portion 41a and both rising portion pressing portions 41b have a pressing surface 44 for the reflection sheet 20 over the entire area, and the pressing surface 44 is formed on the bottom portion 20a and both rising portions 20b of the reflection sheet 20. It can be said that it is formed so as to be able to suppress the straddling range. More specifically, the bottom pressing portion 41a has a substantially straight plate shape parallel to the bottom portion 20a. On the other hand, the rising portion pressing portion 41b has an inclined shape having a certain gradient from the rising base end portion (end portion on the bottom pressing portion 41a side) to the rising tip portion (end portion on the side opposite to the bottom pressing portion 41a side).
- the inclination angle (bending angle, rising angle) is substantially the same as the inclination angle of the rising portion 20b with respect to the bottom portion 20a. That is, the rising angle of the rising portion pressing portion 41b is preferably an acute angle (a size not exceeding 90 degrees), more preferably a size not exceeding 45 degrees, and specifically, for example, 20 degrees to 30 degrees. Degrees.
- the bottom pressing portion 41a can hold the bottom portion 20a over its entire length in the short side direction, while both rising portion pressing portions 41b are partially in detail in the short side direction of the rising portion 20b. Can hold the portion adjacent to the bottom 20a (rising base end).
- the support part 42 can support the optical member 15 from the back side, that is, the hot cathode tube 17 side, and thereby the Z-axis direction (of the optical member 15 of the optical member 15 (particularly, the diffusion plate 30) and the hot cathode tube 17).
- the positional relationship (distance, interval) with respect to the direction orthogonal to the plate surface) can be regulated to be constant. Thereby, the optical member 15 can stably exhibit a desired optical function.
- the support portion 42 is provided in the bottom pressing portion 41a of the main body portion 41, and more specifically, is disposed at a position eccentric toward one end in the long side direction of the bottom pressing portion 41a.
- each pressing member 40 arranged along the long side direction in the chassis 14 is arranged in such a direction that adjacent support portions 42 form a staggered shape (FIG. 16).
- the support portion 42 as a whole has a conical shape in which the Z-axis direction (direction substantially orthogonal to the plate surface of the diffusion plate 30) coincides with the axial direction.
- the support portion 42 is cut along the plate surface of the bottom pressing portion 41a.
- the cross-sectional shape is a circular shape and is tapered so that the diameter dimension gradually decreases from the protruding proximal end side to the protruding distal end side.
- the attachment portion 43 can be held in an attached state with respect to the chassis 14 by being inserted and locked in an attachment hole 14f formed in the bottom plate 14a of the chassis 14.
- a pair of attachment portions 43 are provided on the bottom pressing portion 41a of the main body portion 41.
- the mounting portions 43 are arranged side by side at positions separated from each other in the long side direction (Y-axis direction) of the bottom pressing portion 41a.
- One mounting portion 43 of the pair of mounting portions 43 is disposed at a position overlapping the front-side support portion 42 in a plan view, more specifically at a concentric position.
- the mounting portion 43 has a locking piece that can be elastically deformed in the process of being inserted into the mounting hole 14f, and this locking piece is hooked from the back side to the edge of the mounting hole 14f.
- the pressing member 40 can be held in an attached state with respect to the chassis 14.
- the bottom 20a of the reflection sheet 20 is formed with an insertion hole that communicates with the attachment hole 14f and can be inserted through the attachment portion 43 at a position corresponding to the attachment hole 14f.
- the pressing member 40 that is disposed across the bottom 20a and the rising portion 20b and has the pressing surface 44 that presses the bottom 20a and the rising portion 20b from the diffusion plate 30 side is provided. ing. Since the rising portion 20b of the reflection sheet 20 rises from the bottom portion 20a to the diffusion plate 30 side, the shape becomes unstable, for example, the rising angle from the bottom portion 20a fluctuates or deformation such as warping or bending occurs. It tends to be easy.
- the pressing member 40 has the pressing surface 44 that is disposed across the bottom portion 20 a and the rising portion 20 b of the reflection sheet 20.
- the portion 20b Since the portion 20b is pressed from the diffusion plate 30 side, it is possible to restrict the rising portion 20b from being displaced to the diffusion plate 30 side. Thereby, it is possible to suppress the rising angle of the rising portion 20b with respect to the bottom portion 20a from being changed, and the rising portion 20b from being deformed such as warping or bending. That is, since the shape of the rising portion 20b can be stably maintained, the directionality of the light reflected there can be stabilized, and thus the light emitted from the backlight device 12 is less likely to be uneven. .
- FIG. 18 is a plan view showing the arrangement configuration of the hot cathode tubes and the reflection sheet in the chassis
- FIG. 19 is a cross-sectional view taken along the line xix-xix in FIG.
- the chassis 214 is provided with a receiving portion 45 that can receive the rising portion 20b of the reflection sheet 20 from the back side (the side opposite to the light emitting side).
- the receiving portion 45 has a wall shape (plate shape) rising from the bottom plate 214a toward the front side, and its main wall surface (main plate surface) coincides with the Y-axis direction, and the plate thickness direction coincides with the X-axis direction. ing. It can be said that the receiving part 45 is interposed between the bottom plate 214a and the rising part 20b.
- the receiving portion 45 is disposed at a position on the bottom plate 214a so as to overlap with the rising portions 20b when viewed in plan.
- the receiving portions 45 are arranged side by side at positions separated in the X-axis direction, and are arranged in a substantially equal pitch.
- the receiving portion 45 located in the center in the X-axis direction is disposed at a central position in the long side direction of the chassis 214.
- the receiving portion 45 has a substantially triangular cross-section cut along the Y-axis direction, and has a shape that follows a space (gap) surrounded by the rising portion 20b, the bottom plate 214a, and the side plate 214b.
- the surface of the receiving portion 45 facing the front side is inclined with respect to both the bottom plate 214a and the side plate 214b (Y-axis direction and Z-axis direction).
- the receiving surface 45a can receive a part of the portion 20b from the back side.
- the receiving surface 45a is configured to extend (in parallel) along the rising portion 20b.
- the angle (inclination angle) formed by the receiving surface 45a with respect to the bottom plate 214a (the Y-axis direction, the direction from the bottom 20a to the rising portion 20b) is substantially the same as the rising angle of the rising portion 20b from the bottom 20a.
- the gap is hardly held between the rising portion 20b and the receiving surface 45a of the receiving portion 45.
- Each receiving portion 45 is configured to be continuous with the inner surfaces of the bottom plate 214a and the side plate 214b, whereby the strength of the chassis 214 is improved.
- the receiving portion 45 capable of receiving the rising portion 214b from the bottom plate 214a side is provided between the bottom plate 214a and the rising portion 214b. Since the rising portion 20b of the reflection sheet 20 rises from the bottom plate 214a side to the diffusion plate 30 side, the rising angle from the bottom plate 214a side fluctuates, deformation such as warping or bending occurs, and the like. It tends to stabilize. In this regard, according to the present embodiment, since the rising portion 20b can be received from the bottom plate 214a side by the receiving portion 45, it is possible to restrict the rising portion 20b from being displaced to the bottom plate 214a side.
- the rising angle of the rising portion 20b from the bottom plate 214a side is changed, and the rising portion 20b from being deformed such as warping or bending. That is, since the shape of the rising portion 20b can be stably maintained, the directionality of the light reflected there can be stabilized, and thus the light emitted from the backlight device 12 is less likely to be uneven. .
- FIGS. In this Embodiment 4, what changed the shape of the reflective sheet 320 is shown.
- action, and effect as above-mentioned Embodiment 1 is abbreviate
- 20 is a plan view showing the arrangement configuration of the hot cathode tube and the reflection sheet in the chassis
- FIG. 21 is a sectional view taken along the line xxi-xxi in FIG. 20
- FIG. 22 is a sectional view taken along the line xxii-xxii in FIG.
- the reflection sheet 320 is formed in a bowl shape as a whole, and includes a bottom portion 320 a disposed on the center side of the bottom plate 14 a of the chassis 14 and both ends on the long side of the bottom portion 320 a. And a total of four rising portions 320b rising from both ends on the short side.
- the rising portions 320b rise from both end portions on the long side of the bottom portion 320a, and from a pair of first rising portions 320bA arranged at positions sandwiching the bottom portion 320a in the Y-axis direction, and both end portions on the short side of the bottom portion 320a
- the first rising portion 320bA and a pair of second rising portions 320bB are arranged at positions where the bottom portion 320a is sandwiched with respect to the X-axis direction.
- the first rising part 320bA and the second rising part 320b are inclined so as to rise from the bottom part 320a with a predetermined rising angle.
- the first rising part 320bA and the second rising part 320bB are connected to each other and bent at the boundary position.
- the diffusing plate 30 used in the present embodiment is assumed to have the same light reflection performance as that of the first embodiment described above, the first rising portion 320bA and the second rising portion 320bB among the first rising portions 320bA.
- the rising base end position of the part 320bA may be set to overlap with the half-value width region.
- FIG. 23 is a plan view showing an arrangement configuration of the cold cathode tube, the light source holding member, and the reflection sheet in the chassis
- FIG. 24 is a sectional view taken along line xxiv-xxiv in FIG.
- the cold-cathode tube 50 that forms a light source (linear light source) in the present embodiment has an elongated tubular shape (linear shape) and is a hollow elongated glass sealed at both ends.
- mercury, rare gas, and the like are sealed, and a fluorescent material is applied to the inner wall surface.
- a relay connector (not shown) is disposed at each end of the cold cathode tube 50, and the relay connector is connected to a lead terminal protruding from the electrode to the outside of the glass tube.
- the cold cathode tube 50 is connected to an inverter board (not shown) attached to the outer surface side of the bottom plate 14a of the chassis 14 through this relay connector, and its drive can be controlled.
- the outer diameter of the cold cathode tube 50 is smaller than the outer diameter (for example, about 15.5 mm) of the hot cathode tube 17 shown in the first embodiment, and is about 4 mm, for example.
- the cold cathode tubes 50 having the above-described structure are arranged in parallel with each other at a predetermined interval (arrangement pitch) with the length direction (axial direction) aligned with the long side direction of the chassis 14. In this state, it is housed in the chassis 14 in an unevenly distributed form. More specifically, the bottom plate 14a of the chassis 14 (portion facing the diffusion plate 30) is positioned at the first end portion 14A in the short side direction and the end portion on the opposite side to the first end portion 14A. When divided into the second end portion 14B and the central portion 14C sandwiched between them, the cold cathode fluorescent lamp 50 is disposed at the central portion 14C of the bottom plate 14a, and forms a light source arrangement region LA therein. .
- the light source arrangement area LA according to the present embodiment is wider than that of the first embodiment.
- the cold cathode tube 50 is not disposed at the first end portion 14A and the second end portion 14B of the bottom plate 14a, and a light source non-arrangement region LN is formed here. That is, the cold-cathode tube 50 forms the light source arrangement area LA in a form that is unevenly distributed in the center portion in the short side direction of the bottom plate 14a of the chassis 14, and the area of the light source arrangement area LA is equal to each light source non-arrangement area LN. It is supposed to be larger than the area.
- the ratio of the area (the length dimension in the Y-axis direction) of the light source arrangement region LA to the area of the entire screen (the vertical dimension (short side dimension) of the screen) is larger than that of the first embodiment. About 42%. Further, the pair of light source non-arrangement regions LN have substantially the same area. Further, the cold cathode fluorescent lamp 50 is formed so that its length dimension is substantially equal to the horizontal dimension (long side dimension) of the screen.
- the bottom part 420a of the reflection sheet 420 has a short side dimension that is slightly larger than the light source arrangement area LA of the bottom plate 14a of the chassis 14, and overlaps the light source arrangement area LA in a plan view.
- the formation range of the bottom 420a is expanded according to the light source arrangement area LA, and the formation range of the rising part 420b corresponding to the light source non-arrangement area LN is reduced accordingly. Therefore, the rising angle of the rising portion 420b from the bottom portion 420a is larger than that in the first embodiment.
- the full width at half maximum HW of the diffuser plate 430 is expanded along with the expansion of the light source arrangement area LA and the bottom 420a, and the width dimension of the non-full width half area NHW is reduced accordingly.
- the rising base end position BP in the rising portion 420b is set to overlap with the half width region HW as in the first embodiment.
- a light source holding member 51 for holding the cold cathode tube 50 is attached to the bottom plate 14 a of the chassis 14.
- the light source holding member 51 includes a main body portion 51a capable of sandwiching the bottom portion 420a with the bottom plate 14a, a light source holding portion 51b that protrudes from the main body portion 51a to the front side and can hold the cold cathode tube 50, and a main body portion 51a.
- a support portion 51c that protrudes to the front side and can support the diffusion plate 430 from the back side, and a mounting portion 51d that protrudes from the main body portion 51a to the back side and is attached to the bottom plate 14a.
- the light source holding part 51b has a pair of arm parts, and the cold cathode tube 50 can be attached and detached through a gap held between the tip parts of both arm parts.
- both arms can be elastically deformed while opening outward, and the cold cathode tube 50 can be elastically held between both arms.
- the cold cathode tube 50 can be kept straight in the axial direction, and the positional relationship between the cold cathode tube 50 and the diffusion plate 430 in the Z-axis direction can be kept constant. .
- the main body 51a has substantially the same configuration as the bottom pressing portion 41a (see FIG. 17) in the pressing member 40 shown in the second embodiment, and the support portion 51c is the pressing member shown in the second embodiment.
- the configuration is substantially the same as the support portion 42 (see FIG. 17) in the member 40, and the attachment portion 51d is the same configuration as the attachment portion 43 (see FIG. 17) in the pressing member 40 shown in the second embodiment. For this reason, redundant explanation is omitted.
- the light source includes the cold cathode tube 50. By doing so, it is possible to extend the life and to easily perform light control.
- FIG. 25 is a plan view showing the arrangement of the LEDs and the reflection sheet in the chassis
- FIG. 26 is a sectional view taken along the line xxvi-xxvi in FIG.
- a plurality of LEDs 60 serving as a light source are mounted on an LED substrate 61 accommodated in the chassis 14 so that the LEDs 60 as a whole extend along the X-axis direction.
- An existing linear light source is configured.
- the LED substrate 61 is made of a synthetic resin having a white surface with excellent light reflectivity.
- the LED substrate 61 extends along the bottom plate 14a of the chassis 14 and is fixed to the bottom plate 14a by fixing means (not shown). Has been.
- the LED substrate 61 has a rectangular shape that is horizontally long when seen in a plan view, and is attached to the bottom plate 14 a with its long side direction aligned with the long side direction of the chassis 14.
- the short side dimension of the LED board 61 is smaller than the vertical dimension of the screen (short side dimension of the chassis 14), and the long side dimension of the LED board 61 is substantially equal to the horizontal dimension of the screen (long side dimension of the chassis 14). Is done. Further, a wiring pattern made of a metal film is formed on the LED substrate 61, and the LED 60 is mounted at a predetermined position. An external control board (not shown) is connected to the LED board 61, and electric power necessary for lighting the LED 60 is supplied from the LED board 61, and drive control of the LED 60 is possible.
- the LED 60 is a so-called surface-mount type that is surface-mounted on the LED substrate 61, and a large number of LEDs 60 are arranged in a grid pattern (in a matrix) on the front surface of the LED substrate 61 in the X-axis direction and the Y-axis direction. Is arranged.
- Each LED 60 has a configuration in which an LED chip is sealed with a resin material on a substrate portion fixed to the LED substrate 61.
- the LED 60 is a top type in which a surface opposite to the mounting surface with respect to the LED substrate 61 is a light emitting surface ES.
- the optical axis of the LED 60 substantially coincides with the Z-axis direction (direction perpendicular to the plate surfaces of the liquid crystal panel 11 and the optical member 15).
- a bottom plate 14a of the chassis 14 (a portion facing the diffuser plate 30) is formed with a first end portion 14A in the short side direction and a second end portion 14B located at the end opposite to the first end portion 14A.
- the LED substrate 61 on which a large number of LEDs 60 are mounted is disposed in the central portion 14C of the bottom plate 14a, and the light source arrangement region LA is formed here.
- the LED substrate 61 is not disposed on the first end portion 14A and the second end portion 14B of the bottom plate 14a, and a light source non-arrangement region LN is formed here.
- the LED 60 and the LED substrate 61 form the light source arrangement region LA in a form that is unevenly distributed in the central portion in the short side direction of the bottom plate 14 a of the chassis 14.
- the ratio of the area (length dimension in the Y-axis direction) of the light source arrangement region LA to the area of the entire screen (vertical dimension (short side dimension) of the screen) can be set as appropriate, and is described in the first embodiment or the embodiment. 4 can also be used, and values other than those shown in the first and fourth embodiments can also be used.
- the light source includes the LED 60. In this way, it is possible to extend the life and reduce power consumption.
- the present invention is not limited to the embodiments described with reference to the above description and drawings.
- the following embodiments are also included in the technical scope of the present invention.
- the rising base end position of the rising portion in the reflection sheet has been arranged in the light source non-arrangement region, but if it overlaps with the non-half-value width region in the diffusion plate, the rising edge Also included in the present invention is that the rising base end position of the part is arranged in the light source arrangement region.
- the shape of the rising portion can be changed as appropriate.
- the cross-sectional shape of the rising portion can be a curved shape (secondary curve shape, elliptical shape, etc.) other than the arc shape.
- the angle formed by the rising portion with respect to the Y-axis direction is an acute angle of 45 degrees or less, but an acute angle of 45 degrees or more is also included in the present invention.
- the rising portion is arranged at the end in the short side direction of the reflection sheet.
- the present invention is also applied to the case where the rising portion is arranged at the end in the long side direction. Is applicable.
- the present invention can be applied to, for example, a reflection sheet in which a rising portion having a mountain-shaped cross section is provided in the central side portion.
- the pressing member described in the second embodiment can be used in the first to third modifications and the fourth embodiment of the first embodiment.
- the receiving portion described in the third embodiment can be used in the first to third modifications and the fourth embodiment of the first embodiment.
- the cold cathode tube described in Embodiment 5 can be used as the light source, or the LED described in Embodiment 6 can be used.
- the number of hot cathode tubes used can be changed and can be two or more.
- the ratio of the light source arrangement area to the vertical dimension of the screen is preferably about 37%, for example.
- the ratio of the above-described light source arrangement region may be adjusted in proportion to the number of hot cathode tubes.
- the light source using six cold cathode tubes is shown.
- the number of cold cathode tubes used can be changed, and can be 5 or less or 7 or more. Is possible.
- the ratio of the light source arrangement region to the vertical dimension of the screen is preferably about 26%, for example.
- the ratio of the light source arrangement area to the vertical dimension of the screen is preferably about 58%, for example.
- the ratio of the light source arrangement region may be adjusted in proportion to the number of cold cathode tubes used.
- the size of the LED substrate relative to the chassis, the installation position and the number of LEDs installed on the LED substrate, and the like can be changed as appropriate.
- the center portion in the chassis is the light source arrangement region, and the first end and the second end are the light source non-arrangement region.
- at least one of the second end and the second end portion is used as a light source arrangement region, and the other is used as a light source non-arrangement region.
- the first end portion and the central portion can be used as the light source arrangement region, and the second end portion and the central portion can be used as the light source arrangement region.
- the light source is unevenly arranged in the chassis (including the light source arrangement region and the light source non-arrangement region). However, the light source is uniformly distributed over the entire area of the chassis.
- the present invention can also be applied to such a configuration.
- the present invention includes a type using a discharge tube (such as a mercury lamp) other than the fluorescent tube.
- an LED that is a kind of point light source is used as the light source.
- an LED that uses another type of point light source is also included in the present invention.
- a planar light source such as an organic EL can be used.
- the one using one type of light source is shown.
- a configuration in which a plurality of types of light sources are used together is also included in the present invention. Specifically, a hot cathode tube and a cold cathode tube are mixed, a hot cathode tube and an LED are mixed, a cold cathode tube and an LED are mixed, a hot cathode tube, a cold cathode tube and an LED, May be mixed.
- each dot of the dot pattern constituting the light reflecting portion in the diffuser plate has a round shape.
- the shape of each dot is not limited to this, but an elliptical shape or a polygonal shape. Any shape can be selected.
- the light reflecting portion is formed by printing on the surface of the diffusion plate.
- the present invention includes one using other forming means such as metal vapor deposition.
- the light reflection portion is formed on the surface of the diffusion plate to adjust the light reflectance in the surface of the diffusion plate.
- the diffusion plate is as follows. You may adjust own light reflectivity.
- the diffusion plate generally has a configuration in which light scattering particles are dispersed in a light-transmitting substrate. Therefore, the light reflectance of the diffusion plate itself can be determined by the blending ratio (% by weight) of the light scattering particles with respect to the translucent substrate. In other words, the light reflectance can be relatively increased by relatively increasing the blending ratio of the light scattering particles, and the light reflectance can be relatively decreased by relatively decreasing the blending ratio of the light scattering particles. It can be made smaller.
- the light reflectance of the diffuser is designed and controlled by changing the area of the dots constituting the light reflecting portion.
- the present invention also includes a case where means for changing the arrangement interval of dots having the same area or forming dots having different light reflectivities is used.
- each dot may be formed of a plurality of materials having different light reflectivities.
- the light reflection portion is formed on the diffusion plate in the optical member and the light reflectance is appropriately controlled.
- the light reflection portion is formed on the optical member other than the diffusion plate.
- the present invention includes a device whose light reflectance is appropriately controlled.
- the number and type of diffusion plates and optical sheets used as optical members can be changed as appropriate.
- the screen size and the horizontal / vertical ratio in the liquid crystal display device can be appropriately changed.
- liquid crystal panel and the chassis are illustrated in a vertically placed state in which the short side direction coincides with the vertical direction, but the liquid crystal panel and the chassis have the long side direction in the vertical direction. Those that are in a vertically placed state matched with are also included in the present invention.
- the TFT is used as the switching element of the liquid crystal display device.
- the present invention can be applied to a liquid crystal display device using a switching element other than the TFT (for example, a thin film diode (TFD)).
- a switching element other than the TFT for example, a thin film diode (TFD)
- the present invention can be applied to a liquid crystal display device for monochrome display.
- the liquid crystal display device using the liquid crystal panel as the display panel has been exemplified.
- the present invention can be applied to display devices using other types of display panels.
- the television receiver provided with the tuner is exemplified, but the present invention can be applied to a display device not provided with the tuner.
- SYMBOLS 10 Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12 ... Backlight device (illumination device), 14, 214 ... Chassis, 14a, 214a ... Bottom plate, 14b, 214b ... Side plate, 14c ... Receiving Plate, 14A ... 1st edge part, 14B ... 2nd edge part, 14C ... Center part, 15 ... Optical member, 17 ... Hot cathode tube (light source), 20, 320, 420 ... Reflection sheet, 20a, 320a, 420a ... Bottom part, 20b, 320b, 420b ... rise part, 20c ... extension part, 30 ...
- diffusing plate optical member
- 31 ... optical sheet optical member
- 32 ... light reflecting part 32a ... dot
- Receiving part 50 ... Cold cathode tube (light source), 60 ... LED (light source), BP ... Rising base end position, DA ... Light source superimposing part (part overlapping the light source arrangement area), D ... light source non-overlapping part (part overlapping with light source non-arrangement region), EP ... rising tip position, ES ... light emitting surface, HW ... half-value width region (region having light reflectance R satisfying equation (1)), LA ... Light source arrangement area, LN ... light source non-arrangement area, NHW ... non-half-value width area (area having light reflectance not satisfying formula (1)), TV ... TV receiver
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Abstract
Description
ところで、特許文献1に開示された装置において、消費電力のより一層の抑制やコスト低減を実現するためには、配置する光源の数を減少させることが望ましい。しかしながら、このような構成にすると、特許文献1に採用されたような調光用ドットパターンでは、局所的な暗所が形成される場合がある。すなわち、局所的な暗所の形成を抑制するためには、拡散板の反射率の設定や調光用ドットパターンの配置態様を光源の配置に即してより正確に行う必要があり、さらにはシャーシ内において光を拡散板へと反射させる反射シートの態様についても光源の配置に適したものとする必要がある。
本発明の照明装置は、光源と、前記光源に対して光出射側とは反対側に配される底板を有するとともに前記光源を収容するシャーシと、前記光源に対して前記光出射側に配される光学部材と、前記シャーシ内に配されるとともに前記底板側から前記光学部材側に立ち上がる立ち上がり部を有していて光を反射させる反射シートとを備え、前記シャーシは、前記光学部材と対向する部分が、前記光源が配される光源配置領域と、前記光源が配されない光源非配置領域とに区分されているのに対し、前記光学部材は、前記光源配置領域と重畳する部位のうち少なくとも前記光源側と対向する面の光反射率が、前記光源非配置領域と重畳する部位のうち少なくとも前記光源側と対向する面の光反射率よりも大きいものとされており、前記光学部材のうち少なくとも前記光源側と対向する面における光反射率の最大値をRmax、最小値をRminとしたとき、前記反射シートにおける前記立ち上がり部の立ち上がり基端位置が、前記光学部材のうち下記式(1)を満たす光反射率Rを有する領域と重畳し、且つ前記立ち上がり部の立ち上がり先端位置が、前記光学部材のうち下記式(1)を満たす光反射率Rを有する領域と重畳しないよう配されている。
(1)前記反射シートは、前記底板に沿って配されるとともに少なくとも一部が前記光源配置領域に配される底部を有しており、前記立ち上がり部は、前記底部から前記光学部材側に立ち上がる形態とされている。反射シートのうち光源配置領域に対応して配される部分は、光源とシャーシの底板との間に介在することになるため、仮にその部分が複雑な形状となっていれば、例えば光源を設置する上での妨げとなる可能性がある。その点、本発明によれば、反射シートのうち光源配置領域に配されるのは、底板に沿って配される底部における少なくとも一部であるから、例えば光源を設置する上で反射シートが妨げとはなり難くなる。
本発明の実施形態1を図1から図10によって説明する。まず、液晶表示装置10を備えたテレビ受信装置TVの構成について説明する。
図1は本実施形態のテレビ受信装置の概略構成を示す分解斜視図、図2は図1のテレビ受信装置が備える液晶表示装置の概略構成を示す分解斜視図、図3は図2の液晶表示装置の短辺方向に沿った断面構成を示す断面図、図4は図2の液晶表示装置の長辺方向に沿った断面構成を示す断面図、図5は図2の液晶表示装置に備わるシャーシにおける熱陰極管及び反射シートの配置構成を示す平面図である。なお、図5においては、シャーシの長辺方向をX軸方向とし、短辺方向をY軸方向としている。
液晶パネル(表示パネル)11は、一対のガラス基板が所定のギャップを隔てた状態で貼り合わせられるとともに、両ガラス基板間に液晶が封入された構成とされる。一方のガラス基板には、互いに直交するソース配線とゲート配線とに接続されたスイッチング素子(例えばTFT)と、そのスイッチング素子に接続された画素電極、さらには配向膜等が設けられている。また、他方のガラス基板には、R(赤色),G(緑色),B(青色)等の各着色部が所定配列で配置されたカラーフィルタや対向電極、さらには配向膜等が設けられている。なお、両基板の外側には偏光板11a,11bが配されている(図3及び図4参照)。
図6は拡散板における光反射率の分布を説明する平面図、図7は図6の拡散板における熱陰極管と対向する面の概略構成を示す要部拡大平面図、図8は図6の拡散板の短辺方向における光反射率の変化を示すグラフ、図9は図6の拡散板の長辺方向における光反射率の変化を示すグラフである。なお、図8及び図9においては、拡散板の長辺方向をX軸方向とし、短辺方向をY軸方向としている。また、図8において、横軸はY軸方向(短辺方向)を示しており、Y軸方向に沿って図6に示す手前側端部から奥側端部までの光反射率をプロットしたグラフとなっている。同様に、図9において、横軸はX軸方向(長辺方向)を示しており、Y軸方向に沿って図6に示す左側端部から右側端部までの光反射率をプロットしたグラフとなっている。
以下、上記実施形態に係る反射シート20を用いた実施例と、上記実施形態とは異なる構成の反射シートを用いた比較例とで輝度ムラがどの程度視認されるかを実験し、その結果を下記の表1及び図10に示す。当該比較実験では、底部と立ち上がり部とにおける短辺寸法の比率を異ならせた反射シートを4種類用意し、各反射シートをシャーシ内に収容するとともにシャーシの開口部に拡散板を配置した状態で熱陰極管を点灯させたものをほぼ正面から目視した。また、表1において「◎」は、輝度ムラが全く視認されない場合を、「○」は、輝度ムラが概ね視認されない場合を、「△」は、輝度ムラがやや視認される場合を、「×」は、輝度ムラが視認される場合を示す。なお、図10は、実施例及び各比較例に係る反射シートを用いた場合における拡散板からの出射光のY軸方向についての輝度分布を表すグラフであり、縦軸が最大輝度をそれぞれ100%とした場合の相対輝度を示し、横軸が拡散板におけるY軸方向の位置を示す(図3を参照)。
実施形態1の変形例1について図11を用いて説明する。ここでは、立ち上がり部20b‐1の形状を変更したものを示す。なお、図11は本変形例に係る反射シートを用いた液晶表示装置における短辺方向に沿った断面図である。
実施形態1の変形例2について図12を用いて説明する。ここでは、反射シート20‐2の形状を変更したものを示す。なお、図12は本変形例に係る反射シートを用いた液晶表示装置における短辺方向に沿った断面図である。
実施形態1の変形例3について図13を用いて説明する。ここでは、上記した変形例2から立ち上がり部20b‐3の形状を変更したものを示す。なお、図13は本変形例に係る反射シートを用いた液晶表示装置における短辺方向に沿った断面図である。
実施形態1の変形例4について図14を用いて説明する。ここでは、拡散板30の第1面30aにおける光反射率の分布を変更したものを示す。なお、図14は本変形例に係る拡散板の短辺方向における光反射率の変化を示すグラフである。
実施形態1の変形例5について図15を用いて説明する。ここでは、拡散板30の第1面30aにおける光反射率の分布をさらに変更したものを示す。なお、図15は本変形例に係る拡散板の短辺方向における光反射率の変化を示すグラフである。
本発明の実施形態2を図16または図17によって説明する。この実施形態2では、反射シート20を表側から押さえる押さえ部材40を備えるものを示す。なお、上記した実施形態1と同様の構造、作用及び効果について重複する説明は省略する。また、図16はシャーシにおける熱陰極管、反射シート及び押さえ部材の配置構成を示す平面図、図17は図16のxvii-xvii線断面図である。
本発明の実施形態3を図18または図19によって説明する。この実施形態3では、シャーシ214の形状を変更したものを示す。なお、上記した実施形態1と同様の構造、作用及び効果について重複する説明は省略する。また、図18はシャーシにおける熱陰極管及び反射シートの配置構成を示す平面図、図19は図18のxix-xix線断面図である。
本発明の実施形態4を図20から図22によって説明する。この実施形態4では、反射シート320の形状を変更したものを示す。なお、上記した実施形態1と同様の構造、作用及び効果について重複する説明は省略する。また、図20はシャーシにおける熱陰極管及び反射シートの配置構成を示す平面図、図21は図20のxxi-xxi線断面図、図22は図20のxxii-xxii線断面図である。
本発明の実施形態5を図23または図24によって説明する。この実施形態5では、光源として冷陰極管50を用いるとともに、光源保持部材51を追加したものを示す。なお、上記した実施形態1と同様の構造、作用及び効果について重複する説明は省略する。また、図23はシャーシにおける冷陰極管、光源保持部材及び反射シートの配置構成を示す平面図、図24は図23のxxiv-xxiv線断面図である。
本発明の実施形態6を図25または図26によって説明する。この実施形態6では、光源としてLED60を用いたものを示す。なお、上記した実施形態1と同様の構造、作用及び効果について重複する説明は省略する。また、図25はシャーシにおけるLED及び反射シートの配置構成を示す平面図、図26は図25のxxvi-xxvi線断面図である。
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれる。
(1)上記した各実施形態では、反射シートにおける立ち上がり部の立ち上がり基端位置が光源非配置領域に配されるものを示したが、拡散板における非半値幅領域と重畳するのであれば、立ち上がり部の立ち上がり基端位置が光源配置領域に配されるものも本発明に含まれる。
Claims (23)
- 光源と、
前記光源に対して光出射側とは反対側に配される底板を有するとともに前記光源を収容するシャーシと、
前記光源に対して前記光出射側に配される光学部材と、
前記シャーシ内に配されるとともに前記底板側から前記光学部材側に立ち上がる立ち上がり部を有していて光を反射させる反射シートと、を備え、
前記シャーシは、前記光学部材と対向する部分が、前記光源が配される光源配置領域と、前記光源が配されない光源非配置領域とに区分されているのに対し、前記光学部材は、前記光源配置領域と重畳する部位のうち少なくとも前記光源側と対向する面の光反射率が、前記光源非配置領域と重畳する部位のうち少なくとも前記光源側と対向する面の光反射率よりも大きいものとされており、
前記光学部材のうち少なくとも前記光源側と対向する面における光反射率の最大値をRmax、最小値をRminとしたとき、前記反射シートにおける前記立ち上がり部の立ち上がり基端位置が、前記光学部材のうち下記式(1)を満たす光反射率Rを有する領域と重畳し、且つ前記立ち上がり部の立ち上がり先端位置が、前記光学部材のうち下記式(1)を満たす光反射率Rを有する領域と重畳しないよう配されている照明装置。
(Rmax-Rmin)/2+Rmin<R ・・・(1) - 前記反射シートは、前記底板に沿って配されるとともに少なくとも一部が前記光源配置領域に配される底部を有しており、前記立ち上がり部は、前記底部から前記光学部材側に立ち上がる形態とされている請求項1記載の照明装置。
- 前記立ち上がり部における前記底部からの立ち上がり基端位置は、前記光源非配置領域に配されている請求項2記載の照明装置。
- 前記光源は、光を発する発光面を有しており、前記底部は、前記発光面と対向状をなすよう配されている請求項3記載の照明装置。
- 前記底部と前記立ち上がり部とに跨って配されるとともに前記底部及び前記立ち上がり部を前記光学部材側から押さえる押さえ面を有する押さえ部材が備えられている請求項2から請求項4のいずれか1項に記載の照明装置。
- 前記底板における端部には、前記光出射側に立ち上がる側板が設けられ、この側板における立ち上がり端部には、外向きに張り出す受け板が設けられているのに対し、前記立ち上がり部における立ち上がり先端部には、前記受け板に沿うよう延出する延出部が設けられている請求項2から請求項5のいずれか1項に記載の照明装置。
- 前記立ち上がり部は、前記光学部材との間に保有される間隔が前記光源から遠ざかる方向へ向けて小さくなるよう形成されている請求項1から請求項6のいずれか1項に記載の照明装置。
- 前記立ち上がり部は、傾斜状をなしている請求項7記載の照明装置。
- 前記立ち上がり部は、円弧状をなしている請求項7記載の照明装置。
- 前記立ち上がり部が前記底板に対してなす角度は、鋭角とされる請求項1から請求項9のいずれか1項に記載の照明装置。
- 前記シャーシは、前記光学部材と対向する部分が少なくとも、第1端部と、前記第1端部とは反対側の端部に位置する第2端部と、前記第1端部と前記第2端部とに挟まれる中央部とに区分されており、このうち前記中央部が前記光源配置領域とされ、前記第1端部及び前記第2端部が前記光源非配置領域とされる請求項1から請求項10のいずれか1項に記載の照明装置。
- 前記立ち上がり部は、前記第1端部と前記第2端部とに対応して一対設けられている請求項11記載の照明装置。
- 前記光学部材は、少なくとも前記光源側と対向する面における光反射率が前記光源から遠ざかる方向へ向けて小さくなるものとされている請求項1から請求項12のいずれか1項に記載の照明装置。
- 前記光学部材のうち前記光源側と対向する面には、光を反射させる光反射部が形成されている請求項1から請求項13のいずれか1項に記載の照明装置。
- 前記光反射部は、前記光学部材のうち前記光源側の面内において略点状をなし、光反射性を備える多数のドットからなる請求項14記載の照明装置。
- 前記シャーシは、平面に視て矩形状をなしており、前記光源が前記シャーシの長辺方向に沿って延在する形態とされるとともに、前記光源配置領域と前記光源非配置領域とが前記シャーシの短辺方向に沿って並ぶよう配されている請求項1から請求項15のいずれか1項に記載の照明装置。
- 前記底板と前記立ち上がり部との間には、前記立ち上がり部を前記底板側から受けることが可能な受け部が設けられている請求項1から請求項16のいずれか1項に記載の照明装置。
- 前記光源は、熱陰極管からなる請求項1から請求項17のいずれか1項に記載の照明装置。
- 前記光源は、冷陰極管からなる請求項1から請求項17のいずれか1項に記載の照明装置。
- 前記光源は、LEDからなる請求項1から請求項17のいずれか1項に記載の照明装置。
- 請求項1から請求項20のいずれか1項に記載の照明装置と、前記照明装置からの光を利用して表示を行う表示パネルとを備える表示装置。
- 前記表示パネルは、一対の基板間に液晶を封入してなる液晶パネルとされる請求項21記載の表示装置。
- 請求項21または請求項22に記載された表示装置を備えるテレビ受信装置。
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2010296607A AU2010296607A1 (en) | 2009-09-16 | 2010-08-19 | Lighting device, display apparatus, and television receiver |
JP2011531864A JP5286418B2 (ja) | 2009-09-16 | 2010-08-19 | 照明装置、表示装置、及びテレビ受信装置 |
EP10817012A EP2466192A4 (en) | 2009-09-16 | 2010-08-19 | LIGHTING DEVICE, DISPLAY DEVICE AND TELEVISION RECEIVER |
KR1020127006567A KR20120056278A (ko) | 2009-09-16 | 2010-08-19 | 조명 장치, 표시 장치, 및 텔레비전 수신 장치 |
CN2010800408877A CN102498331A (zh) | 2009-09-16 | 2010-08-19 | 照明装置、显示装置以及电视接收装置 |
US13/395,463 US8827480B2 (en) | 2009-09-16 | 2010-08-19 | Lighting device, display device, and television receiver |
SG2012018537A SG179171A1 (en) | 2009-09-16 | 2010-08-19 | Lighting device, display apparatus, and television receiver |
BR112012005884A BR112012005884A2 (pt) | 2009-09-16 | 2010-08-19 | dispositivo iluminante, dispositivo de exibição e receptor de televisão |
RU2012109921/07A RU2012109921A (ru) | 2009-09-16 | 2010-08-19 | Устройство освещения, устройство отображения и телевизионный приемник |
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JP2009214953 | 2009-09-16 | ||
JP2009-214953 | 2009-09-16 |
Publications (1)
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WO2011033899A1 true WO2011033899A1 (ja) | 2011-03-24 |
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PCT/JP2010/063992 WO2011033899A1 (ja) | 2009-09-16 | 2010-08-19 | 照明装置、表示装置、及びテレビ受信装置 |
Country Status (10)
Country | Link |
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US (1) | US8827480B2 (ja) |
EP (1) | EP2466192A4 (ja) |
JP (1) | JP5286418B2 (ja) |
KR (1) | KR20120056278A (ja) |
CN (1) | CN102498331A (ja) |
AU (1) | AU2010296607A1 (ja) |
BR (1) | BR112012005884A2 (ja) |
RU (1) | RU2012109921A (ja) |
SG (1) | SG179171A1 (ja) |
WO (1) | WO2011033899A1 (ja) |
Cited By (6)
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WO2012133036A1 (ja) * | 2011-03-28 | 2012-10-04 | シャープ株式会社 | 照明装置、表示装置、及びテレビ受信装置 |
CN102819125A (zh) * | 2012-05-02 | 2012-12-12 | 友达光电股份有限公司 | 显示装置 |
JPWO2012164790A1 (ja) * | 2011-05-31 | 2014-07-31 | パナソニック株式会社 | 面光源および液晶ディスプレイ装置 |
WO2015060272A1 (ja) * | 2013-10-21 | 2015-04-30 | シャープ株式会社 | 液晶表示装置 |
JP2015094820A (ja) * | 2013-11-11 | 2015-05-18 | 船井電機株式会社 | 表示装置 |
WO2020040212A1 (ja) * | 2018-08-21 | 2020-02-27 | シチズン電子株式会社 | バックライト装置 |
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EP3185071B1 (en) * | 2015-12-23 | 2019-10-09 | Samsung Electronics Co., Ltd. | Display apparatus |
KR102613460B1 (ko) | 2019-01-03 | 2023-12-14 | 삼성전자주식회사 | 디스플레이 장치 |
US10991339B1 (en) * | 2019-11-26 | 2021-04-27 | Facebook Technologies, Llc | System and method for increasing light uniformity for a display backlight |
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- 2010-08-19 WO PCT/JP2010/063992 patent/WO2011033899A1/ja active Application Filing
- 2010-08-19 EP EP10817012A patent/EP2466192A4/en not_active Withdrawn
- 2010-08-19 SG SG2012018537A patent/SG179171A1/en unknown
- 2010-08-19 US US13/395,463 patent/US8827480B2/en not_active Expired - Fee Related
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CN112805617A (zh) * | 2018-08-21 | 2021-05-14 | 西铁城电子株式会社 | 背光装置 |
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US11754878B2 (en) | 2018-08-21 | 2023-09-12 | Nichia Corporation | Backlight device |
Also Published As
Publication number | Publication date |
---|---|
JP5286418B2 (ja) | 2013-09-11 |
SG179171A1 (en) | 2012-04-27 |
RU2012109921A (ru) | 2013-10-27 |
AU2010296607A1 (en) | 2012-04-05 |
BR112012005884A2 (pt) | 2019-09-24 |
EP2466192A1 (en) | 2012-06-20 |
US8827480B2 (en) | 2014-09-09 |
EP2466192A4 (en) | 2012-11-14 |
US20120169945A1 (en) | 2012-07-05 |
JPWO2011033899A1 (ja) | 2013-02-14 |
KR20120056278A (ko) | 2012-06-01 |
CN102498331A (zh) | 2012-06-13 |
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