WO2008026346A1 - Element optique, dispositif a sources lumineuses et ecran - Google Patents

Element optique, dispositif a sources lumineuses et ecran Download PDF

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Publication number
WO2008026346A1
WO2008026346A1 PCT/JP2007/058453 JP2007058453W WO2008026346A1 WO 2008026346 A1 WO2008026346 A1 WO 2008026346A1 JP 2007058453 W JP2007058453 W JP 2007058453W WO 2008026346 A1 WO2008026346 A1 WO 2008026346A1
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WO
WIPO (PCT)
Prior art keywords
light source
optical member
light
region
degree
Prior art date
Application number
PCT/JP2007/058453
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English (en)
Japanese (ja)
Inventor
Kentaroh Aoki
Original Assignee
Sharp Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Kabushiki Kaisha filed Critical Sharp Kabushiki Kaisha
Publication of WO2008026346A1 publication Critical patent/WO2008026346A1/fr

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Classifications

    • 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
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • 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

Definitions

  • Optical member, light source device and display device are Optical members, light source device and display device
  • the present invention relates to an optical member, a light source device, and a display device. More specifically, the present invention relates to an optical member that adjusts characteristics of light emitted from a light source, a light source device including the optical member, and a display device. is there.
  • a display device including a non-self-luminous display panel such as a transmissive or transflective liquid crystal panel has a configuration in which a light source is disposed on the back side of the display panel or a light source is incorporated.
  • a light source device sometimes referred to as a backlight device or a backlight unit
  • the light emitted from the light source is irradiated on the back surface of the display panel and transmitted through the front surface of the display panel, thereby displaying an image on the front surface of the display panel in a visible state.
  • FIG. 30 is an exploded perspective view schematically showing a conventional example of the configuration of a liquid crystal display device including a light source.
  • This liquid crystal display device 9 shown in FIG. 30 includes a light source 91, a display panel 92 (for example, a transmissive liquid crystal panel), and an optical member 93 (also referred to as optical sheets) disposed therebetween. . Then, the characteristics of the light emitted from the light source 91 are adjusted by the optical member 93, and the light whose characteristics are adjusted can be irradiated to the back surface of the display panel 92.
  • the luminance distribution in the surface direction of the display panel 92 be uniform.
  • a linear light source 91 for example, a fluorescent tube
  • a luminance difference tends to occur on the front surface of the display panel 92.
  • the luminance is high at the position where the light source 91 is arranged at the back and the vicinity thereof, and the position where the light source 91 is not arranged at the back, specifically, between the light sources 91 is Brightness tends to be low
  • the light sources are arranged at equal intervals, and between the light source and the display panel.
  • an optical member having a function of diffusing light emitted from the light source By arranging an optical member having a function of diffusing light emitted from the light source, the intensity distribution in the surface direction of the light irradiated on the back surface of the display panel is made uniform.
  • JP-A-6-118246 and JP-A-2004-45939 can be cited.
  • the problem to be solved by the present invention is to provide an optical member, a light source device, and a display device that can prevent or suppress the occurrence of a luminance difference on a screen.
  • the present invention provides a plurality of holes or a plurality of groove-shaped recesses into which a linear light source can be inserted and formed substantially parallel to each other, and the plurality of adjacent holes or a plurality of adjacent holes. At least a portion between the inner wall surfaces of the groove-like recesses is more diffusive than other regions.
  • the gist is that a region having a high degree is provided.
  • the region where the degree of light diffusion is high is formed such that the thickness increases as the inner wall surface force of the plurality of holes or the plurality of groove-shaped recesses is also separated.
  • the region where the degree of light diffusion is high is provided near the ends of the plurality of holes or the groove-shaped recesses, and is provided near the ends of the axial direction. It is preferable that That is, the region where the degree of diffusion of light is high is a portion where a portion having a high light emission intensity per unit length of the light source is located in a state where the light source is inserted into the plurality of holes or the plurality of groove-shaped recesses. It is preferable to be provided.
  • the region where the degree of light diffusion is high is formed in a tapered shape or a tapered shape toward one end force in the axial direction of the plurality of holes or the plurality of groove-shaped recesses.
  • the plurality of holes or the plurality of groove-shaped recesses are formed in a tapered shape toward the center of each end force in the axial direction. That is, the region where the degree of diffusion of light is high is a portion where the portion where the light emission intensity per unit length of the light source is high is located in the state where the light source is inserted into the plurality of holes or the plurality of groove-shaped recesses. It is preferable that the cross-sectional area corresponding to the portion where the light emission intensity per unit length is large and the area is small is formed.
  • the display panel has a surface arranged substantially parallel to the display panel, and the axes of the plurality of holes are made substantially parallel to a surface arranged substantially parallel to the display panel.
  • the region where the degree of light diffusion is high is formed such that the thickness decreases as the center line force of the plurality of holes or the plurality of grooves increases.
  • the region where the degree of light diffusion between the surface disposed substantially parallel to the display panel and the inner wall surface of the plurality of holes is high is the axial direction of the plurality of holes or the plurality of groove-shaped recesses.
  • the force is a structure provided near one end of the material, and a structure is provided near each end. That is, in the region where the degree of light diffusion is high, a portion where the light emission intensity per unit length of the light source is high in a state where the light source is inserted into the plurality of holes or the plurality of groove-like recesses is located. It is preferable to be provided in the part.
  • the region having a high degree of light diffusion between the surface arranged substantially parallel to the display panel and the inner wall surfaces of the plurality of holes is an axial direction of the plurality of holes or the plurality of groove-shaped recesses.
  • the taper shape or taper shape is formed from one end to the other end, or the taper shape is formed from each end in the axial direction of the plurality of holes or groove-shaped recesses toward the center. It is preferred that That is, the region where the degree of light diffusion is high is a portion where a portion where the light emission intensity per unit length of the light source is high in a state where the light source is inserted into the plurality of holes or the plurality of groove-shaped recesses.
  • the cross-sectional area of the unit is large. It is preferable that the cross-sectional area corresponding to the portion where the light emission intensity per unit length is low is formed small.
  • a light source when a light source is inserted into a plurality of holes or a plurality of groove-shaped recesses to emit light, it is provided between the inner walls of the plurality of adjacent holes or the plurality of groove-shaped recesses.
  • Light incident on a region with a high degree of light diffusion diffuses there. For this reason, since the extent of diffusion of these lights is high, the region itself appears to emit light! /, So the optical member appears to emit light over the entire surface. Therefore, the intensity distribution of the light emitted from the optical member to the outside can be made uniform.
  • the intensity distribution is uniform.
  • Light can be applied to the display panel.
  • a region having a higher degree of light diffusion than other regions, at least in part between a surface arranged substantially parallel to the display panel and the inner wall surface of the plurality of holes or groove-shaped recesses If provided, the light emitted from the light source can be diffused. Therefore, the light intensity distribution can be made uniform. Then, if the thickness of the region where the degree of light diffusion is high is formed so that the center line force of each of the plurality of holes or the plurality of groove-like recesses decreases, the light intensity distribution becomes uniform. Can be more effective.
  • a light source device including such an optical member can irradiate the display panel with light having a uniform intensity distribution in the surface direction. Therefore, a display device to which such a light source device is applied can perform image display with a uniform luminance distribution.
  • FIG. 1 is an external perspective view schematically showing a configuration of an optical member according to a first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view schematically showing the internal structure of the optical member.
  • (A) shows a cut surface substantially perpendicular to the axis of the light source insertion hole, and (b) shows an A— A cross-sectional view taken along line A, showing a cut surface in a direction substantially parallel to the front surface.
  • FIG. 3 is a diagram showing a modification of the cross-sectional shape of the lateral high diffusion region, (a) shows a configuration in which the lateral high diffusion region has an angular cross-sectional shape, and (b) shows the high diffusion region at the front and Reach the back Shows the configuration.
  • FIG. 4 is a partial cross-sectional view schematically showing a configuration of an optical member according to the second embodiment.
  • A is a diagram illustrating a light source configured to apply an AC voltage to one electrode and ground the other electrode.
  • (B) shows a state in which a pseudo U-tube is inserted into the light source insertion hole.
  • FIG. 5 is a partial cross-sectional view schematically showing a configuration of an optical member that works according to the third embodiment.
  • FIG. 7 is a partial cross-sectional view schematically showing a configuration of an optical member that works on the fifth embodiment.
  • FIG. 8 is a partial cross-sectional view schematically showing a configuration of an optical member that works on the sixth embodiment.
  • a cross-sectional view showing a modified example of the back high diffusion region (a) shows a configuration in which the back side of the lateral high diffusion region and the front side of the back high diffusion region are connected and integrated, (b ) Shows a configuration in which the lateral high diffusion region and the back high diffusion region are completely integrated.
  • ⁇ 10 A partial cross-sectional view schematically showing the configuration of an optical member that works according to the seventh embodiment.
  • ⁇ 11 A cross-sectional view showing a modified example of the front high diffusion region.
  • (A) is a front high diffusion.
  • (B) shows a configuration in which the front high diffusion region reaches the inner wall surface of the light source insertion hole, and (c) shows the front height. The diffusion region is exposed on the front surface of the seventh optical member, and shows the configuration.
  • FIG. 13 is a plan view schematically showing a configuration of a modified example of the optical member. .
  • FIG. 14 is a partial sectional view schematically showing a configuration of an optical member that works on the ninth embodiment.
  • FIG. 15 (a) is a partial cross-sectional view schematically showing the configuration of the optical member according to the tenth embodiment.
  • (B) is a partial cross-sectional view schematically showing a configuration of a modified example of the optical member that works on the embodiment.
  • FIG. 16 is a partial cross-sectional view schematically showing the configuration of the optical member according to the eleventh embodiment.
  • FIG. 17 is a partial cross-sectional view showing an example of a configuration of a combination of a lateral high diffusion region, a back high diffusion region, and a front high diffusion region.
  • FIG. 18 A diagram schematically showing a configuration of an optical member that is effective in the twelfth embodiment of the present invention, in which (a) shows a front side force, and (b) shows a view from the back side. It is.
  • FIG. 19 is a cross-sectional view schematically showing the internal structure of the optical member that works according to the embodiment, (a) shows a cut surface perpendicular to the axis of the light source insertion recess, and (b) is substantially on the front surface. Shows a parallel section.
  • FIG. 20 is a cross-sectional view showing a modification of the laterally high diffusion region of the optical member according to the embodiment, where (a) shows a configuration in which the laterally highly diffused region has an angular cross-sectional shape, and (b) shows a lateral shape. A configuration in which the high diffusion region reaches the front surface and the back surface is shown, and (c) shows a configuration in which the lateral high diffusion region is provided over the entire rear surface.
  • A) shows a light source configured to apply an AC voltage to one electrode and ground the other electrode.
  • B) shows a state in which a pseudo U-tube is inserted into the light source insertion recess.
  • FIG. 22 is a partial cross-sectional view schematically showing a configuration of an optical member that works according to the fourteenth embodiment.
  • FIG. 23 is a partial cross-sectional view schematically showing a configuration of an optical member that works according to the fifteenth embodiment, wherein (a) is a light source that applies an AC voltage to one electrode and grounds the other electrode. (B) shows a state in which a pseudo U-shaped tube is inserted into the light source insertion recess. 24] Partial cross section schematically showing the configuration of the optical member according to the sixteenth embodiment. It is a figure.
  • a configuration is shown in which a light source insertion recess having a depth such that a part of the light source protrudes from the light source insertion recess is shown.
  • FIG. 26 is an exploded perspective view schematically showing a configuration of a main part of the light source device according to the first embodiment.
  • FIG. 27 is an exploded perspective view schematically showing a configuration of a main part of the light source device according to the second embodiment.
  • FIG. 28 is an exploded perspective view schematically showing a configuration of a main part of a display device according to an embodiment of the present invention.
  • FIG. 29 is an exploded perspective view schematically showing a configuration of a main part of a television receiver including a display device according to an embodiment of the present invention.
  • FIG. 30 is an exploded perspective view schematically showing a conventional example of a configuration of a main part of a liquid crystal display device.
  • Fig. 1 is an external perspective view schematically showing the configuration of an optical member that works on the first embodiment of the present invention.
  • the optical member that works on the first embodiment of the present invention may be abbreviated as “first optical member”.
  • the first optical member 101 has a configuration suitable for a light source device or a display device including a plurality of linear light sources. Examples of the linear light source include fluorescent tubes such as cold cathode tubes and hot cathode tubes.
  • the first optical member 101 is formed in a plate shape with at least one surface being substantially flat.
  • a surface 1011 formed in a substantially flat surface is used so as to be substantially parallel to the display panel.
  • the surface 1011 formed in a substantially flat surface that is, the surface facing the display panel
  • the opposite surface is referred to as “back surface 101 2”. Called.
  • the surface facing upward is the front surface 1011.
  • the first optical member 101 has a plurality of holes 1015 (hereinafter referred to as “light source insertion holes 1015”) into which linear light sources can be inserted. These light source insertion holes 1015 are through holes that penetrate the inside of the first optical member 101.
  • the surface 1014 in which the opening of the light source insertion hole 1015 appears is referred to as an “end surface”, and the surface 1013 parallel to the light source insertion hole 1015 between the front surface 1011 and the back surface 1012 is referred to as an “outer surface”.
  • the axes are formed substantially parallel to the front surface 1011 and substantially parallel to each other.
  • the number of the light source insertion holes 1015 is not particularly limited, and is set according to the configuration of the light source device or the display device to which the first optical member 101 is applied. For example, the number is set equal to the number of light sources provided in the light source device or display device to which the first optical member 101 is applied.
  • FIG. 1 is a force showing a configuration in which 14 light source insertion holes 1015 are formed, and is not limited to this number.
  • the interval between the light source insertion holes 1015 is set according to the configuration of the light source device or display device to which the first optical member 101 is applied. For example, in order to make the intensity distribution in the surface direction of light emitted from the front surface 1011 to the outside uniform, it is set at substantially equal intervals.
  • the inner diameter of the light source insertion hole 1015 may be set to a size that allows the light source to be inserted without difficulty, for example, slightly larger than the outer diameter of the light source.
  • the length of the light source insertion hole 1015 (or the axial dimension of the light source insertion hole 1015 of the first optical member 101) is such that both ends of the light source inserted into the light source insertion hole 1015 protrude to the outside.
  • the dimensional force is also set to a size range such that the light source is completely accommodated in the light source insertion hole 1015.
  • the thickness of the first optical member 101 (which is the dimension between the front surface 1011 and the back surface 1012) is not particularly limited. For example, what is necessary is just to set suitably according to the structure (specifically the dimension of the space which accommodates the 1st optical member 101, etc.) of the light source device or display apparatus to which the 1st optical member 101 is applied.
  • the dimension from the front surface 1011 to the inner wall surface of the light source insertion hole 1015 is not particularly limited.
  • FIG. 1 shows a configuration in which the light source insertion hole 1015 is formed at substantially the center of the thickness direction dimension of the first optical member 101, it is not necessarily formed at the substantially center.
  • the light sources inserted into the light source insertion holes 1015 are arranged substantially parallel to the front surface 1011 of the first optical member 101 and substantially parallel to each other.
  • FIG. 2 is a cross-sectional view schematically showing the internal structure of the first optical member 101.
  • 2 (a) shows a cut surface of the first optical member 101 in a direction substantially perpendicular to the axis of the light source insertion hole 1015
  • FIG. 2 (b) is a cross-sectional view taken along the line AA in FIG. 2 (a).
  • FIG. 10 is a view showing a cut surface in a direction substantially parallel to the front surface 1011.
  • the first optical member 101 has a space between the inner wall surfaces of the adjacent light source insertion holes 1015 and between the light source insertion holes 1015 and the outer surface 1013 at both ends.
  • a region 1017 having a higher degree of diffusing light emitted from the light source than other regions is provided.
  • these areas 1017 are referred to as “lateral high diffusion areas”.
  • the cross-sectional shape of the lateral high diffusion region 1017 has a shape that becomes thinner as it approaches the inner wall surface of the light source insertion hole 1015 that is thickest in the vicinity of the middle of the adjacent light source insertion holes 1015.
  • the cross-sectional shape of the laterally high diffusion region 1017 provided between the light source insertion holes 1015 and the outer surface 1013 at both ends is a shape that becomes thinner as it approaches the inner wall surface of the light source insertion hole 1015 from the outer surface 1013.
  • “the cross-sectional shape of the laterally high diffusion region 1017” means a cross-sectional shape substantially perpendicular to the axis of the light source insertion hole 1015.
  • these laterally high diffusion regions 1017 are columnar regions provided over substantially the entire length of the light source insertion hole 1015 in the axial direction.
  • the first optical member 101 has a configuration in which light source insertion holes 1015 and lateral high diffusion regions 1017 are alternately provided in a direction substantially parallel to the front surface 1011.
  • the material and configuration of the first optical member 101 may be the same material and configuration as the diffusion sheet or diffusion plate.
  • a structure in which particles made of a material having a refractive index different from that of the resin material are mixed and dispersed in a transparent resin material such as acrylic resin can be applied.
  • particles include, for example, silica beads (fine particles of silicon dioxide (SiO 2)).
  • the lateral high diffusion region 1017 is formed to have a higher degree of light diffusion than the other regions.
  • the number per unit volume of the particles having different refractive indexes dispersed in the lateral high diffusion region 1017 or the ratio of the volume of the particles to the unit volume is made higher than that in other regions.
  • the proportion of the volume of the particles in the unit volume in the other region is 60%
  • the proportion of the volume of the particles in the unit volume in the lateral high diffusion region 1017 is It should be about 1.2 to 1.5 times that of other areas.
  • the number of the particles per unit volume in the lateral high diffusion region 1017 or other regions, or the ratio of the volume of the particles to the unit volume, or the lateral high diffusion region 1017 is not particularly limited. For example, it may be set according to the light emission amount of the light source used.
  • insert molding or two-color molding can be applied as a method of forming the first optical member 101.
  • insert molding there is a method in which columnar parts that become the laterally high diffusion region 1017 are formed by force, and these parts are embedded in a material that diffuses less light than these parts. Applicable. Insert molding and two-color molding are methods that are widely used as molding methods for resin molded products, and thus description thereof is omitted.
  • a part to be a high diffusion region and a part to be a region other than that are separately formed and integrated by using an adhesive or the like. It's okay.
  • the direction of the light emitted from the light source is parallel to the surface direction of the front surface 1011 of the first optical member 101 and its direction.
  • the component traveling in the direction close to is incident on the lateral high diffusion region 1017.
  • the light incident on the lateral high diffusion region 1017 is diffused by the particles. For this reason, the lateral high diffusion region 1017 itself appears to emit light! /. Therefore, when the first optical member 101 is also viewed from the front surface 1011 side force with the light source emitted, the first optical member 101 is spread over the entire surface by the light emission of the light source and the pseudo light emission of the lateral high diffusion region 1017. It seems to emit light across.
  • the first optical member is provided.
  • the intensity distribution of light emitted from the front surface 1011 of 101 to the outside can be made uniform.
  • the lateral high diffusion region 1017 when the lateral high diffusion region 1017 is not provided, when the optical member is viewed from the front side, the light source power at which the intensity of the light emitted from the position where the light source is disposed is the highest is also separated. It becomes lower according to. For this reason, the light intensity distribution becomes non-uniform.
  • the lateral high diffusion region 1017 is provided between the inner wall surfaces of the adjacent light source insertion holes 1015 and between the light source insertion holes 1015 and the outer surface 1013 at both ends, the lateral high diffusion region 1017 is simulated. Therefore, it is possible to emit light with high intensity even from a position where the light source power is far away.
  • the intensity distribution of the light emitted from the front surface 1011 can be made uniform.
  • the thickness dimension of the lateral high diffusion region 1017 is increased as the distance from the light source insertion hole 1015 increases, the effect of uniformizing the intensity of light emitted to the outside can be increased.
  • the region with a high degree of light diffusion ie, a region that emits light in a pseudo manner
  • the intensity of light incident on the light source power decreases as the light source power increases.
  • the pseudo light emission area increases, the effect of uniforming the intensity distribution of the light emitted from the front surface 1011 as a whole increases.
  • the display panel It is possible to prevent or suppress the intensity distribution of the light irradiating the back of the light from becoming uneven.
  • FIG. 3 is a view showing a modification of the cross-sectional shape of the lateral high diffusion region 1017 and shows a cross section of the first optical member 101 cut in a direction substantially perpendicular to the axis of the light source insertion hole 1015.
  • FIG. 3 (a) shows a configuration in which the lateral high diffusion region 1017 has an angular cross-sectional shape
  • FIG. 3 (b) shows the lateral high diffusion region 1017 in the front surface 1011 and the rear surface of the first optical member 101. It shows a configuration that reaches 1012 (in other words, exposed to the front 1011 and the back 1012).
  • FIG. 3 is a view showing a modification of the cross-sectional shape of the lateral high diffusion region 1017 and shows a cross section of the first optical member 101 cut in a direction substantially perpendicular to the axis of the light source insertion hole 1015.
  • FIG. 3 (a) shows a configuration in which the lateral high diffusion region 1017 has an angular cross-sectional shape
  • the lateral high diffusion region 1017 may have a square cross-sectional shape. As shown in FIG. 3 (b), the lateral high diffusion region 1017 is the first optical member. It may be configured to reach the front surface 1011 or the rear surface 1012 of 101.
  • the lateral high diffusion region 1 017 Any configuration may be used. Further, the inner wall surface force of the light source insertion hole 1015 may be separated so that the lateral high diffusion region 1017 has a shape that increases the thickness direction dimension.
  • optical member that can be applied to the second embodiment of the present invention and an optical member that can be applied to the third embodiment will be described.
  • the optical member that works on the second embodiment of the present invention is abbreviated as “second optical member”, and the optical member according to the third embodiment of the present invention is referred to as “third optical unit”. It may be abbreviated as “material”.
  • Some light source devices or display devices including a fluorescent tube as a light source have a configuration in which an alternating voltage is applied to one electrode of the light source and the other electrode is grounded. In addition, there is a configuration in which an opposite-phase AC voltage is applied to the electrodes at both ends of the light source. In addition, there is a usage method called “pseudo U-shaped tube” as a usage method of the light source.
  • the pseudo U-shaped tube is a method in which two light sources electrically connected in series are arranged in parallel.
  • the electrode side to which the AC voltage is applied is directed to the grounded electrode side per unit length of the light source (or There may be a phenomenon in which the emission intensity per unit area decreases.
  • the emission intensity per unit length in the vicinity of each electrode increases, and when the emission intensity decreases in the vicinity of the middle of the electrode, a phenomenon occurs.
  • the same phenomenon as described above can occur depending on the application method of the AC voltage.
  • a linear light source such as a fluorescent tube may have uneven emission intensity along the axial direction. Even if the light emission intensity per unit length of the light source is not uniform, the intensity of the light emitted to the outside of the optical member is uniform over the entire area of the front surface of the optical member. I prefer that.
  • the intensity distribution of the light emitted from the front force of the optical member is uneven. It has a configuration that can prevent or suppress uniformity.
  • FIG. 4 is a partial cross-sectional view schematically showing the configuration of the second optical member 102 and shows a state where the light source 21 is inserted into the light source insertion hole 1015.
  • an AC voltage is applied to one electrode, and the other electrode is grounded.
  • the two light sources 21 shown in FIG. 4 (b) constitute a pseudo U-shaped tube, one electrode is electrically connected, and an AC voltage is applied to the other electrode.
  • the second optical member 102 shown in FIGS. 4 (a) and 4 (b) has the same configuration, and the driving method of the light source 21 inserted into the light source insertion hole 1015 is different.
  • the second optical member 102 has adjacent light source insertion holes 1015.
  • a lateral high diffusion region 1017 is provided between the inner wall surfaces and between the light source insertion holes 1015 and the outer surface 1013 at both ends. These laterally high diffusion regions 1017 are provided at positions deviated toward one end face 1014 (the right front face end face in the figure).
  • an electrode to which an AC voltage is applied is arranged on the side where the lateral high diffusion region 1017 is provided, and a grounding electrode is provided on the side where the lateral high diffusion region 1017 is not provided.
  • a grounding electrode is provided on the side where the lateral high diffusion region 1017 is not provided.
  • electrodes for applying an AC voltage are arranged on the side where the lateral high diffusion region 1017 is provided, and The electrically connected electrodes are arranged on the side where the lateral high diffusion region 1017 is not provided.
  • the side with the high emission intensity per unit length is placed on the side where the lateral high diffusion region 1017 is provided, and the side with the low emission intensity is on the side where the lateral high diffusion region 1017 is not provided To arrange.
  • the laterally high diffusion region 1017 is preferably provided in a range from the end surface 1014 at which the opening of the light source insertion hole 1015 appears to the approximate center of the axial length of the light source insertion hole 1015 (FIG. 4 also shows this). Indicates the configuration provided in the range).
  • the range in which the lateral high diffusion region 1017 is provided in the present invention is not limited to this range, and the range in which the lateral high diffusion region 1017 is provided may be changed as appropriate.
  • the point is that the light source 21 is inserted into the light source insertion hole 1015 so that the portion where the light emission intensity per unit length of the light source 21 is high is located within the range in which the lateral high diffusion region 1017 is provided. . That is, the range in which the lateral high diffusion region 1017 is provided may be appropriately set according to the light emission intensity per unit length of each part of the light source 21 to be applied.
  • FIG. 5 is a partial cross-sectional view schematically showing the configuration of the third optical member 103, schematically showing a state where the light source 21 is inserted into the light source insertion hole 1015.
  • the light source insertion holes 1 between the inner wall surfaces of adjacent light source insertion holes 1015 and at both ends.
  • a laterally high diffusion region 1017 is provided between 015 and the outer surface 1013. These laterally high diffusion regions 1017 are provided near both ends of the light source insertion hole 1015 in the axial direction, and are not provided near the center.
  • a reverse phase AC voltage is applied to the electrodes at both ends of the light source 21 inserted into the light source insertion hole 1015. Therefore, as described above, the emission intensity per unit length near both ends of the light source 21 is large. The emission intensity near the center decreases. Therefore, if the range in which the lateral high diffusion region 1017 is provided is as described above, when the light source 21 inserted into the light source insertion hole 1015 is caused to emit light, the portion where the emission intensity per unit length is high is the lateral high diffusion region. The part where the light emission intensity per unit length is low is located in the part where the lateral high diffusion region 1017 is not provided.
  • the lateral high diffusion region 1017 is preferably provided in the range of about 1Z3 of the axial length of the light source insertion hole 1015 from the end surface 1014 where the opening of the light source insertion hole 1015 appears.
  • FIG. 5 also shows a configuration in which the lateral high diffusion region 1017 is provided in this range.
  • the present invention is not limited to this range, and the range in which the lateral high diffusion region 1017 is provided may be appropriately changed. In short, it suffices if the light source 21 is inserted into the light source insertion hole 1015 and the portion where the light emission intensity per unit length of the light source 21 is located in the range where the lateral high diffusion region 1017 is provided. That is, the range in which the lateral high diffusion region 1017 is provided may be appropriately set according to the light emission intensity per unit length of each part of the light source 21 to be applied.
  • the second optical member 102 or the third optical member 103 the same operational effects as the first optical member 101 can be obtained. Furthermore, by providing the lateral high diffusion region 1017 at a position close to a portion where the light emission intensity of the light source 21 is high, strong light can be diffused greatly. For this reason, the intensity distribution of light emitted from the front surface 1011 can be prevented or suppressed from becoming uneven.
  • an optical member (hereinafter may be abbreviated as “fourth optical member”) according to the fourth embodiment of the present invention and an optical member according to the fifth embodiment (hereinafter referred to as “fifth optical member”). Is sometimes abbreviated as “optical member”).
  • the fourth optical member and the fifth optical member have a configuration in which the cross-sectional shape of the lateral high diffusion region 1017 changes along the axial direction of the light source insertion hole 1015.
  • FIG. 6 is a partial cross-sectional view schematically showing the configuration of the fourth optical member.
  • Fig. 6 (a) shows a state in which an AC voltage is applied to one electrode of the light source 21 inserted into the light source insertion hole 1015 and the other electrode is grounded
  • Fig. 6 (b) shows that the light source insertion hole 1015 A configuration is shown in which the light source 21 inserted in is used as a pseudo U-shaped tube.
  • the member 104 has the same configuration, and the driving method of the light source 21 inserted into the light source insertion hole 1015 is different.
  • FIGS. 6 (a) and 6 (b) there is a horizontal gap between the inner wall surfaces of adjacent light source insertion holes 1015 and between the light source insertion holes 1015 and the outer surface 1013 at both ends.
  • a high diffusion region 1017 is provided.
  • the cross-sectional shape of these laterally high diffusion regions 1017 changes along the axial direction of the light source insertion hole 1015.
  • one end face 101 the end face 1014 located on the right front side in FIG. 6) 4 force is also directed to the other end face.
  • the cross-sectional area of the lateral high diffusion region 1017 gradually decreases.
  • an electrode to which an AC voltage is applied is arranged on the side where the cross sectional area of the lateral high diffusion region 1017 is large, and the grounding electrode is a cross-sectional area force S of the lateral high diffusion region 1017. Place on the small side.
  • the electrodes to which an AC voltage is applied are arranged on the side where the cross-sectional area of the lateral high diffusion region 1017 is large and are electrically connected to each other. Is arranged on the side where the cross-sectional area of the lateral high diffusion region 1017 is small.
  • FIG. 7 is a partial cross-sectional view schematically showing the configuration of the fifth optical member 105. Then, a state in which the light source 21 is inserted into the light source insertion hole 1015 and reverse-phase AC voltages are applied to the electrodes at both ends of the inserted light source 21 is shown.
  • lateral high diffusion regions 1017 are provided between the inner wall surfaces of adjacent light source insertion holes 1015 and between the light source insertion holes 1015 and the outer surface 1013 at both ends.
  • the lateral high diffusion region 1017 has a shape in which the cross-sectional area gradually decreases in accordance with the directional force from each end face 1014 in the axial direction of the light source insertion hole 1015 to the center. Therefore, when an alternating voltage of opposite phase is applied to both ends of the light source 21 inserted into the light source insertion hole 1015 to emit light, the portion with high emission intensity near both ends of the light source 21 has the cross-sectional area of the lateral high diffusion region 1017.
  • the part located at the large part and having the low emission intensity near both ends is located at the part where the cross-sectional area of the lateral high diffusion region 1017 is small.
  • 6 and 7 may be configured to change in a force curve showing a configuration in which the cross-sectional area of the lateral high diffusion region 1017 changes linearly.
  • the cross-sectional area may be increased at a position close to a portion where the light emission intensity per unit length of the light source 21 is high, and the cross-sectional area may be decreased at a position close to a portion where the light emission intensity is low.
  • the cross-sectional area of the lateral high diffusion region 1017 may be set according to the specific axial distribution of the emission intensity of the light source.
  • FIG. 8 is a partial cross-sectional view schematically showing the configuration of an optical member (hereinafter, may be abbreviated as “sixth optical member”) that is useful for the sixth embodiment of the present invention, It is an enlarged view (part A enlarged view) with a part extracted (part A in the figure).
  • ixth optical member an optical member that is useful for the sixth embodiment of the present invention
  • Part A enlarged view an optical member that is useful for the sixth embodiment of the present invention
  • the sixth optical member 106 is a plate-like member having at least a front surface 1011 formed in a substantially flat surface, and a plurality of light source insertion holes 1015 are formed therein.
  • a lateral high diffusion region 1017 is provided between the inner wall surfaces of the adjacent light source insertion holes 1015 and between the inner wall surface and the outer side surface 1013 of the light source insertion holes 1015 at both ends.
  • a region 1018 having a large degree of light diffusion compared to other regions is entirely formed between the inner wall surface of the light source insertion hole 1015 and the back surface 1012. It can be installed across the board.
  • this region is referred to as a “back high diffusion region”.
  • the same material and forming method as the lateral high diffusion region 1017 can be applied to the material and formation method of the back high diffusion region 1018.
  • the component of the light emitted from the light source that proceeds in a direction parallel to the surface direction of the front surface 1011 and a direction close thereto is: It enters the lateral high diffusion region 1017 and diffuses there. Therefore, the same effect as any one of the first optical member force and the fifth optical member can be obtained.
  • the light traveling with the light source force directed toward the back surface 1012 is incident on the back high diffusion region 1018 provided between the light source insertion hole 1015 and the back surface 1012, and diffuses there. Therefore, When the back high diffusion region 1018 is provided over the entire surface, the sixth optical member 106 appears to emit light over the entire surface. Therefore, it is possible to increase the effect of preventing or suppressing the occurrence of non-uniformity in the intensity distribution of the light emitted from the front surface 1011 to the outside.
  • FIG. 9 is a cross-sectional view showing a modified example of the back high diffusion region 1018.
  • Fig. 9 (a) shows a configuration in which the back side of the lateral high diffusion region 1017 and the front side of the back high diffusion region 1018 are connected and integrated
  • Fig. 9 (b) shows the lateral high diffusion region 1017.
  • a configuration in which the back high diffusion region 1018 is completely integrated is shown.
  • the thickness of the back surface high diffusion region 1018 may be increased and integrated with the lateral high diffusion region 1017. Even with such a configuration, the same operational effects as described above can be obtained.
  • the laterally high diffusion region 1017 shown in FIGS. 8 and 9 has the same configuration as that of the optical member 101 that works in the first embodiment, but the laterally high diffusion region 1017 is limited to this configuration. is not. That is, the configuration of the lateral high diffusion region 1017 of any one of the first optical member to the fifth optical member can be appropriately selected and applied.
  • FIG. 10 is a partial cross-sectional view schematically showing a configuration of an optical member (hereinafter, may be abbreviated as “seventh optical member”) according to the seventh embodiment of the present invention.
  • One requirement for a liquid crystal display device is a reduction in the thickness of the device.
  • the distance between the display panel and the light source is reduced, the brightness of the screen is locally increased at the position where the display panel and the light source are close to each other. For this reason, a luminance difference is easily generated on the screen between the position where the light source is close and the other position.
  • the seventh optical member 107 diffuses light directly emitted from the light source to the display panel. And having a configuration capable of preventing or suppressing the occurrence of a luminance difference on the screen between a position close to the light source and other positions.
  • a configuration different from any of the above embodiments will be mainly described.
  • the common components are denoted by the same reference numerals, and description thereof is omitted.
  • a region 1019 having a higher degree of light diffusion than other regions is provided between the inner wall surface of the light source insertion hole 1015 and the front surface 1011.
  • this region is referred to as a “front high diffusion region”.
  • front high diffusion region 1019 is a columnar region provided substantially parallel to the axis of light source insertion hole 1015.
  • the seventh optical member 107 is provided so as to overlap the light source insertion hole 1015 when the front side 1011 side force is also seen.
  • the front high diffusion region 1019 is formed in a cross-sectional shape that becomes thinner as the center line force of the light source insertion hole 1015 is also separated. For example, as shown in FIG. 10, it is formed in a shape like an isosceles triangle with the front surface 1011 as the base.
  • the “front cross section of the high diffusion region 1019” refers to a cross section substantially perpendicular to the axis of the light source insertion hole 1015.
  • the material and the formation method of the front high diffusion region 1019 can be the same as the horizontal high diffusion region 1017 and the formation method. Therefore, explanation is omitted.
  • the front high diffusion region 1019 is provided on the front surface 1011 side of the light source insertion hole 1015, the component of the light emitted from the light source that is directed toward the front surface 1011 side is directed toward the front surface height. It enters the diffusion region 1019 and diffuses there. Therefore, it is possible to prevent high intensity light from being directly irradiated from the front surface 1011 of the seventh optical member 107 to the back surface of the display panel. As a result, it is possible to prevent or suppress the occurrence of a luminance difference on the screen of the display panel between the position where the light source is disposed and other positions.
  • the front high diffusion region 1019 is formed in a cross-sectional shape in which the thickness decreases as the center line force of the light source insertion hole 1015 is also separated, a luminance difference is generated on the screen of the display panel.
  • the effect of preventing or suppressing can be increased. That is, the intensity of light emitted from the front surface 1011 to the outside increases according to the distance from the inner wall surface force of the light source insertion hole 1015 to the front surface 1011. Therefore, when the inner wall force of the light source insertion hole 1015 is short at the distance to the front surface 1011, the thickness of the front high diffusion region 1019 is increased to increase the intensity of strong light. Scatter.
  • the intensity of light emitted from the front surface 1011 to the outside can be made uniform.
  • FIG. 11 is a schematic cross-sectional view showing various modifications of the cross-sectional shape of the front high diffusion region 1019.
  • 11 (a) shows a configuration in which the cross section of the front high diffusion region 1019 is formed in an arc shape with the front surface 1011 as a chord
  • FIG. 11 (b) shows the front high diffusion region 1019 of the light source insertion hole 1015.
  • FIG. 11 (c) shows a configuration in which the front high diffusion region 1019 is exposed on the front surface 1011 of the seventh optical member 107.
  • FIG. 11 (c) shows the configuration reaching the inner wall surface.
  • FIG. 11 (a) it may have an arc shape with the front surface of the optical member as a chord.
  • the thickness dimension of the front high diffusion region 1019 can be set as appropriate. For example, as shown in FIG. 11 (b), the front high diffusion region 1019 may reach the inner wall surface on the front side of the light source insertion hole 1015. Further, as shown in FIG. 11 (c), the front high diffusion region 1019 may not be exposed to the front surface 1011. Even with such a configuration, the above-described effects can be achieved.
  • the front high diffusion region 1019 may be formed in a part in addition to the entire length between the light source insertion hole 1015 and the front surface 1011. Furthermore, the cross-sectional area perpendicular to the axis of the light source insertion hole 1015 in the front high diffusion region 1019 may be changed along the axial direction, which may be constant over the entire length.
  • the shape of the front high diffusion region 1019 and the range to be formed are appropriately set so that the intensity of light irradiated from the front surface of the optical member can be made uniform.
  • FIG. 12 is a partial cross-sectional view schematically showing a configuration of an optical member (hereinafter, may be abbreviated as “eighth optical member”) that is useful in the eighth embodiment.
  • the eighth optical member 108 is suitable for a configuration in which an AC voltage is applied to one electrode of the light source 21 inserted in the light source insertion hole 1015 and the other electrode is grounded, or a configuration using a pseudo U-shaped tube.
  • FIG. 12 (a) an AC voltage is applied to one electrode of the light source 21 inserted into the light source insertion hole 1015, and the other power source is applied.
  • FIG. 12 (b) shows a state where the light source 21 inserted into the light source insertion hole 1015 is used as a pseudo U-shaped tube.
  • the eighth optical member 108 shown in each of FIGS. 12A and 12B has the same configuration, and the driving method of the light source 21 inserted into the light source insertion hole 1015 is different.
  • the eighth optical member 108 has one of the light source insertion holes 1015 and the front surface 1011 in the axial direction of the light source insertion hole 1015.
  • the front high diffusion region 1019 is provided from the end surface 1014 to the center, and the front high diffusion region 1019 is not provided from the other end surface 1014 to the center.
  • an electrode to which an AC voltage is applied is arranged on the side where the front high diffusion region 1019 is provided, and an electrode which is grounded is arranged on the side where the front high diffusion region 1019 is not provided.
  • the electrodes to which the AC voltage of each light source 21 is applied are arranged on the side where the front high diffusion region 1019 is provided and are electrically connected to each other.
  • the electrode to be disposed is arranged on the side where the front high diffusion region 1019 is not provided.
  • FIG. 13 is a plan view schematically showing a configuration of a modified example of the eighth optical member 108 (hereinafter denoted by reference numeral “108 ′”).
  • the eighth optical member 108 In a configuration in which an AC voltage is applied to one electrode of the light source 21 and the other electrode is grounded, the side on which the electrode to which the AC voltage is applied is arranged and the side on which the electrode to be grounded are arranged alternately.
  • the modification 108 ′ of the eighth optical member has a configuration suitable for the configuration in which the light sources 21 are arranged in this way.
  • front high diffusion regions 10 19 are provided in a staggered manner.
  • the electrode for applying the AC voltage of each light source 21 is arranged on the side where the front high diffusion region 1019 is provided, and the electrode to be grounded is arranged on the side where the front high diffusion region 1019 is not provided.
  • an AC voltage is applied to the electrode located on the side where the front high diffusion region 1019 is provided, and the electrode located on the side where it is not provided is grounded.
  • the side with the high emission intensity per unit length of the light source 21 is arranged on the side where the front high diffusion region 1019 is provided, and the emission intensity is The low side is arranged on the side where the front high diffusion region 1019 is not provided.
  • FIGS. 12 and 13 also show a configuration in which the front high diffusion region 1019 is provided in this range.
  • the present invention is not limited to this range. In short, it is sufficient if the configuration is such that the portion where the light emission intensity of the light source 21 is high can be accommodated in the range where the front high diffusion region 1019 is provided.
  • FIG. 14 is a partial cross-sectional view schematically showing a configuration of an optical member (hereinafter, may be abbreviated as “ninth optical member”) that is useful in the ninth embodiment of the present invention.
  • a state in which the light source 21 is inserted into the light source insertion hole 1015 is schematically shown.
  • the ninth optical member 109 is suitable for a configuration in which an AC voltage having an opposite phase is applied to each electrode of the light source 21.
  • the front high diffusion region 1019 is provided near both ends in the axial direction of the light source insertion hole 1015 between the inner wall surface of the light source insertion hole 1015 and the front surface 1011. It is not provided near the center. As a specific range, for example, a range of about one third of the length direction dimension from the axial end surface 1014 of the light source insertion hole 1015 is preferable. FIG. 14 also shows a configuration in which the front high diffusion region 1019 is provided in this range.
  • the emission intensity per unit length is high.
  • the portion is located in the portion where the front high diffusion region 1019 is provided, and the portion having a low emission intensity per unit length is located in the portion where the front high diffusion region 1019 is not provided.
  • the range in which the front high diffusion region 1019 is provided is not limited to the above range, and can be changed as appropriate. In short, in a state where the light source 21 is inserted into the light source insertion hole 1015, a portion where the light emission intensity per unit length of the light source 21 is high can be included in the range where the front high diffusion region 1019 is provided. That's fine. That is, the range in which the front high diffusion region 1019 is provided may be appropriately set according to the light emission intensity per unit length of each part of the light source 21 to be applied.
  • the eighth optical member 108 or the ninth optical member 109 the same operational effects as the seventh optical member 107 can be obtained. Further, by providing the front high diffusion region 1019 on the side where the light emission intensity per unit length of the light source 21 is large, strong light can be diffused more greatly. Therefore, even when the light source 21 and the display panel are close to each other, It is possible to prevent or suppress the occurrence of a luminance difference on the panel screen.
  • an optical member according to the tenth embodiment (hereinafter, may be abbreviated as “tenth optical member”) and an optical member according to the eleventh embodiment (hereinafter, “eleventh eleventh embodiment”). Is sometimes abbreviated as “optical member”).
  • the tenth optical member 110 and the eleventh optical member 111 are formed by a cross-sectional shape force of the front high diffusion region 1019 provided between the inner wall surface of the light source insertion hole 1015 and the front surface 1011. Has a configuration that varies along
  • FIG. 15A is a schematic plan view showing the configuration of the tenth optical member 110
  • FIG. 15B is a schematic plan view showing the configuration of a modification of the tenth optical member 110.
  • the tenth optical member 110 is suitable for a configuration in which an AC voltage is applied to one electrode of the light source 21 and the other electrode is grounded, or a configuration using a pseudo U-shaped tube.
  • a modification of the tenth optical member 110 (indicated by reference numeral “110 ′”) alternates between a side on which an electrode for applying an AC voltage is disposed and a side on which a grounded electrode is disposed. It is suitable for a configuration in which they are replaced and arranged.
  • the front high diffusion region 1019 has a smaller cross-sectional area in accordance with the one end force in the axial direction of the light source insertion hole 1015 and the other direction. (Or become larger).
  • the modified example 110 ′ of the tenth optical member also has a front high diffusion region 1019 extending from one end surface 1014 in the axial direction of the light source insertion hole 1015 to the other end surface 1014. It has a shape that reduces (or increases) the cross-sectional area as it goes.
  • the front high diffusion region 1019 is formed such that the cross-sectional area is large V, the side and the cross-sectional area are small, and the side is alternately switched.
  • an electrode for applying an AC voltage is arranged on the side where the cross sectional area of the front high diffusion region 1019 is large, and the cross sectional area is small! Arrange the grounding electrode on the heel side.
  • the ⁇ -th optical member 111 is suitable for a configuration in which an AC voltage having an opposite phase is applied to each electrode of the light source.
  • FIG. 16 is a cross-sectional view schematically showing the configuration of the eleventh optical member 111, schematically showing a state where the light source 21 is inserted into the light source insertion hole 1015.
  • the front high diffusion region 1019 of the eleventh optical member 111 has a small cross-sectional area according to the directional force from both end surfaces 1014 where the opening of the light source insertion hole 1015 appears. It has a shape to become.
  • the light emission intensity of the light source 21 is large in the vicinity of both ends and small in the central portion, so that more intense light can be diffused.
  • the cross-sectional area of the front high diffusion region 1019 is changed along the axial direction of the light source insertion hole 1015, and the portion where the light emission intensity per unit length of the light source 21 is high is changed to the front high diffusion region 10.
  • a configuration may be adopted in which 19 is disposed in a portion having a large cross-sectional area, and a portion having a low emission intensity can be disposed in a portion having a small cross-sectional area of the front high diffusion region 1019.
  • the cross-sectional area of the front high diffusion region 1019 may be changed in accordance with the change in the emission intensity per unit length of the light source 21 to be inserted. According to such a configuration, more intense light can be diffused and the intensity of light emitted from the front surface 1011 to the outside can be made uniform.
  • FIGS. 15 and 16 show a configuration in which the cross-sectional area of the front high diffusion region 1019 changes linearly, but a configuration in which it changes in a curve may be used.
  • the cross-sectional area of the front high diffusion region 1019 may be set according to the specific light intensity distribution of the light source 21.
  • FIG. 17 is a partial cross-sectional view showing an example of the configuration of the combination.
  • This optical member 120 is suitable for a configuration to which a pseudo U-shaped tube is applied.
  • the optical member 120 is provided with a lateral high diffusion region 1017, a back surface high diffusion region 1018, and a front surface high diffusion region 1019.
  • the lateral high diffusion region 1017 and the front high diffusion region 1019 gradually decrease (or increase) in cross-sectional area according to the direction force from one end surface 1014 in the axial direction of the light source insertion hole 1015 to the other end surface 1014. It has a shape. Further, the back high diffusion region 1018 is provided over the entire surface.
  • the electrodes for applying the AC voltage of each light source are arranged on the side where the cross sectional area of the lateral high diffusion region 1017 and the front high diffusion region 1019 is large, and the electrode to be electrically connected is the side where the cross sectional area is small To arrange.
  • the lateral high diffusion region 1017, the front high diffusion region 1019, the back high diffusion region The effect according to each structure of the diffused region 1018 can be exhibited.
  • the optical member described above, its modified examples, and examples of combinations have a configuration in which a plurality of light source insertion holes are formed and light sources are inserted into these light source insertion holes.
  • the configuration is not limited.
  • the embodiment described below has a configuration in which a groove-like recess into which a light source can be inserted is formed.
  • Each of the following embodiments and each of the embodiments described above have a common configuration except that the light source holding structure is mainly different, and can exhibit the same operational effects. Accordingly, parts having a common configuration are denoted by the same reference numerals, and detailed description thereof is omitted.
  • FIG. 18 is a diagram schematically showing a configuration of an optical member (hereinafter, may be abbreviated as “a twelfth optical member”) that is helpful in the twelfth embodiment of the present invention.
  • a twelfth optical member an optical member that is helpful in the twelfth embodiment of the present invention.
  • FIG. 18 (a) is a view of the twelfth optical member 112 seen from the front side force
  • FIG. 18 (b) is a view seen from the back side force.
  • the front surface 1011 of the twelfth optical member 112 is formed in a substantially flat surface.
  • the front surface 1011 is a surface disposed substantially parallel to the display panel.
  • a plurality of groove-shaped recesses 1016 (hereinafter referred to as “light source insertion recesses”) into which a linear light source can be inserted are formed on the back surface 1012 of the twelfth optical member 112.
  • the These light source insertion recesses 1016 are formed so that their axes are substantially parallel to the front surface 1011 and substantially parallel to each other.
  • the surface 1014 where the axial end of the light source insertion recess 1016 appears is called an “end surface”, and the surface 1013 parallel to the light source insertion hole 1015 between the front surface 1011 and the back surface 1012 is Referred to as "side”.
  • the number of the light source insertion recesses 1016 is not particularly limited, and is set according to the configuration of the light source device or display device to which the twelfth optical member 112 is applied. For example, the number is set equal to the number of light sources included in the light source device or display device to which the twelfth optical member 112 is applied.
  • FIG. 18 shows a configuration in which 14 light source insertion recesses 1016 are formed, but the number is not limited to this.
  • the interval between the light source insertion recesses 1016 is also set according to the configuration of the light source device or display device to which the twelfth optical member 112 is applied. For example, in order to make the intensity distribution in the surface direction of light emitted from the front surface 1011 to the outside uniform, it is set at substantially equal intervals.
  • the groove width of the light source insertion recess 1016 should be a width that allows the light source to be inserted without difficulty, for example, from the outer diameter of the light source. What is necessary is just to set it to a slightly large grade.
  • the length of the light source insertion recess 1016 or the axial dimension of the light source insertion recess 1 016 of the twelfth optical member 112 is such that both ends of the light source inserted into the light source insertion recess 1016 protrude to the outside. Force Set the size range so that the light source is completely stored in the light source insertion recess 1016.
  • the thickness dimension of the twelfth optical member 112 is not particularly limited. For example, what is necessary is just to set suitably according to the structure (specifically the dimension of the space which accommodates this 12th optical member 112, etc.) of the light source device or display apparatus to which the 12th optical member 112 is applied. A variation of the thickness will be described later.
  • the light sources inserted into the light source insertion recess 1016 are placed inside the twelfth optical member 112! / And substantially parallel to each other and the front surface 1011 thereof. They will be lined up almost in parallel.
  • FIG. 19 is a cross-sectional view schematically showing the internal structure of the twelfth optical member 112.
  • FIG. 19 (a) shows a cut surface of the twelfth optical member 112 in a direction substantially perpendicular to the axis of the light source insertion recess 1016
  • FIG. 19 (b) shows a cut surface substantially parallel to the front surface 1011. .
  • the twelfth optical member 112 As shown in FIG. 19 (a), between the inner wall surfaces of the adjacent light source insertion recesses 1016 and between the light source insertion recesses 1016 and the outer surface 1013 at both ends, A lateral high diffusion region 1 017 is provided. These laterally high diffusion regions 1017 are provided in a column shape over substantially the entire length in the axial direction of the light source insertion recess 1016, as shown in FIG. 19 (b). In other words, the twelfth optical member 112 has a configuration in which the light source insertion recess 1016 and the lateral high diffusion region 1017 are alternately provided.
  • the laterally high diffusion region 1017 has a shape that is thickest in the vicinity of the middle of the adjacent light source insertion recesses 1016 and becomes thinner as it approaches the inner wall surface of the light source insertion recesses 1016.
  • the direction of the light emitted from the light source is parallel to the surface direction of the front surface 1011 of the twelfth optical member 112 Oh
  • the component traveling in the direction close to that is incident on the lateral high diffusion region 1017.
  • the light incident on the lateral high diffusion region 1017 diffuses there. For this reason, the lateral high diffusion region 1017 itself appears to emit light! /.
  • the twelfth optical member 112 when the twelfth optical member 112 is viewed from the front surface 1011 side force with the light source emitted, the twelfth optical member 112 is caused by the light emission of the light source and the pseudo light emission of the lateral high diffusion region 1017. Appears to emit light over the entire surface. For this reason, it is possible to achieve the same operational effects as those of the optical member that works in the first embodiment.
  • FIG. 20 is a cross-sectional view showing a modified example of the lateral high diffusion region 1017 and shows a cross section of the twelfth optical member 112 cut in a direction substantially perpendicular to the axis of the light source insertion recess 1016.
  • 20 (a) shows a configuration in which the laterally high diffusion region 1017 has an angular cross section
  • FIG. 20 (b) shows that the laterally high diffusion region 1017 reaches the front surface 1011 and the rear surface 1012 (the front surface 1011 and the rear surface 101 2).
  • FIG. 20 (c) shows a configuration in which the lateral high diffusion region 1017 is provided over the entire surface on the back surface 1012 side.
  • the lateral high diffusion region 1017 may have an angular cross-sectional shape. As shown in FIG. 20 (b), the lateral high diffusion region 1017 has a tenth shape. The configuration may reach the front surface 1011 or the rear surface 1012 of the second optical member 112. Further, as shown in FIG. 20 (c), a configuration in which the lateral high diffusion region 1017 is provided over the entire surface on the back surface 1012 side may be employed.
  • the lateral high diffusion region 1017 is provided in at least a part between the inner wall surfaces of the adjacent light source insertion recesses 1016 and at least a part between the light source insertion recesses 1016 and the outer wall surfaces 1013 at both ends. Any configuration can be used. Further, it is more preferable if the inner wall surface force of the light source insertion recess 1016 is also separated so that the dimension in the thickness direction increases.
  • the lateral high diffusion region 1017 may be provided in a specific range in addition to the configuration provided over the entire length in the axial direction of the light source insertion recess 1016 as described above.
  • the emission intensity per unit length in the axial direction may vary depending on the location. Therefore, even in such a case, the shape of the lateral high diffusion region 1017 and the range in which the lateral high diffusion region 1017 is provided are appropriately set according to the light emission intensity of the light source, and finally the light The academic member can also make the intensity of the emitted light uniform.
  • FIG. 21 is a partial cross-sectional view schematically showing a configuration of an optical member 113 (hereinafter may be abbreviated as “the thirteenth optical member”) according to the thirteenth embodiment. is there.
  • the thirteenth optical member 113 is suitable for a configuration using a light source that applies an AC voltage to one electrode and grounds the other electrode, or a configuration using a pseudo U-shaped tube.
  • FIG. 21 (a) shows a configuration in which an AC voltage is applied to one electrode of the light source 21 inserted into the light source insertion recess 1016 and the other electrode is grounded.
  • FIG. 21 (b) shows a configuration in which the light source 21 inserted into the light source insertion recess 1016 is used as a pseudo U-shaped tube.
  • the thirteenth optical member 113 shown in FIGS. 21 (a) and 21 (b) has the same configuration, and the driving method of the light source 21 to be inserted is different.
  • a laterally high diffusion region 1017 is provided on one end side in the axial direction of the light source insertion recess 1016, and a laterally high diffusion region 1017 is provided on the other end side. I can't. Then, as shown in FIG. 21 (a), an electrode for applying an AC voltage is disposed on the side where the lateral high diffusion region 1017 is provided, and an electrode for grounding is disposed on the side where the lateral high diffusion region 1017 is not provided. In addition, as shown in FIG. 21 (b), when using a pseudo U-shaped tube, an electrode for applying an AC voltage is arranged on the side where the lateral high diffusion region 1017 is provided, and the lateral high diffusion region 1017 is provided. Electrodes that are electrically connected to each other are placed on the unusable side.
  • a portion having a high light emission intensity per unit length of the light source 21 is disposed in a portion where the lateral high diffusion region 1017 is provided, and a portion having a low light emission intensity of the light source 21 is disposed in a portion not provided. .
  • FIG. 21 also shows a configuration in which the lateral high diffusion region 1017 is provided in this range.
  • any configuration may be used as long as the portion where the light emission intensity of the light source 21 is high can be accommodated in the range in which the lateral high diffusion region 1017 is provided.
  • FIG. 22 is a partial cross-sectional view schematically showing a configuration of an optical member (hereinafter, may be abbreviated as “fourteenth optical member”) that is effective in the fourteenth embodiment. .
  • This fourteenth optical member 114 is suitable for a configuration in which an AC voltage having opposite phases is applied to the electrodes at both ends of the light source 21.
  • FIG. 22 schematically shows a state in which the light source 21 is inserted into the light source insertion recess 1016.
  • the laterally high diffusion region 1017 is provided in the vicinity of both end surfaces 1014 in the axial direction of the light source insertion recess 1016, and is not provided in the vicinity of the center.
  • a specific range in which the lateral high diffusion region 1017 is provided for example, a range from the end surface 1014 in the axial direction of the light source insertion recess 1016 to a length dimension of about 1Z3 is preferable.
  • FIG. 22 also shows a configuration in which the lateral high diffusion region 1017 is provided in this range.
  • the present invention is not limited to this range. The point is that the configuration can accommodate a portion where the light emission intensity of the light source is high within the range in which the lateral high diffusion region 1017 is provided.
  • the intensity distribution of the light emitted from the front surface 1011 to the outside can be prevented from becoming non-uniform. Or it can be suppressed.
  • an optical member according to the fifteenth embodiment (hereinafter abbreviated as “fifteenth optical member”) and an optical member according to the sixteenth embodiment (hereinafter referred to as “tenth embodiment”).
  • the lateral high diffusion region 1017 provided in the fifteenth optical member 115 and the sixteenth optical member 116 has a shape that changes along the axial direction of the light source insertion recess 1016.
  • FIG. 23 is a partial sectional view schematically showing the configuration of the fifteenth optical member 115.
  • FIG. 23 (a) shows a configuration in which an AC voltage is applied to one electrode of the light source 21 inserted into the light source insertion recess 1016 and the other electrode is grounded.
  • Fig. 23 (b) shows a configuration in which the light source 21 inserted into the light source insertion recess 1016 is used as a pseudo U-shaped tube. Note that the fifteenth optical member 115 shown in FIGS. 23 (a) and 23 (b) has the same configuration, and the driving method of the light source 21 inserted into the light source insertion recess 1016 is different.
  • the laterally high diffusion region 1017 has a cross-sectional area that decreases (or increases) as it is directed from one end surface 1014 in the axial direction of the light source insertion recess 1016 to the other end surface 1014.
  • the cross-sectional area of the lateral high diffusion region 1017 is large. Place a grounding electrode on the heel side.
  • Fig. 23 (b) when using a pseudo U-shaped tube, An electrode for applying an AC voltage is arranged on the side where the cross-sectional area of 7 is large /, and electrodes which are electrically connected to each other are arranged on the side where the cross-sectional area is small.
  • FIG. 24 is a partial cross-sectional view schematically showing the configuration of the sixteenth optical member 116. As shown in FIG. FIG. 24 schematically shows a state where the light source 21 is inserted into the light source insertion recess 1016.
  • the sixteenth optical member 116 is suitable for a configuration using a light source 21 that applies an AC voltage to the electrodes at both ends.
  • the laterally high diffusion region 1017 has a shape in which the cross-sectional area decreases from the both end surfaces 1014 where the opening of the light source insertion recess 1016 appears to the center according to the direction force.
  • the portion with the high light emission intensity per unit length of the light source 21 fits in the portion with the large cross-sectional area of the lateral high diffusion region 1017, and the portion with the low light emission intensity has a small cross-sectional area. Fits in the part. Therefore, it is possible to achieve substantially the same operational effect as the configuration in which the portion where the light emission intensity per unit length of the light source is accommodated in the portion where the lateral high diffusion region 1017 is provided. Furthermore, since the cross-sectional area of the lateral high diffusion region 1017 changes gradually, it is possible to prevent the intensity of light emitted from the front surface 1011 from changing abruptly.
  • the cross-sectional area of the lateral high diffusion region 1017 changes linearly, a configuration in which it changes in a curve may be used.
  • a configuration in which it changes in a curve may be used.
  • the cross-sectional area of each high diffusion region may be set according to the specific gradient of light emission intensity of the light source.
  • a front high diffusion region 1019 may be provided between the inner wall surface of the light source insertion recess 1016 and the front surface 1011 of the optical member.
  • the configuration of the front high diffusion region 1019 can be the same as that of the front high diffusion region 1019 of the optical member in which the light source insertion hole 1015 is formed. Therefore, explanation is omitted.
  • the “light source insertion hole 1015” may be read as the “light source insertion recess 1016”.
  • the depth of the light source insertion recess is not particularly limited. In each of the above-described embodiments, a configuration is shown in which the light source is formed to a depth that allows the light source to be completely embedded. However, even if the light source is partially deep enough to protrude from the light source insertion recess force. Good.
  • FIG. 25 is a schematic cross-sectional view of an optical member in which a light source insertion recess having a depth such that a part of the light source protrudes from the light source insertion recess is formed. Even with such a configuration, the same operational effects as described above can be obtained. Further, according to such a configuration, since the optical member can be made thin, the material of the optical member can be saved, and the product cost can be reduced. In short, the depth of the light source insertion recess 1016 may be set to such a depth that the lateral high diffusion region 1017 can be provided in at least a part between the adjacent light sources 21. In other words, the thickness of the optical member may be set to a thickness that can provide the lateral high diffusion region 1017 at least at a part between the adjacent light sources 21 !.
  • FIG. 26 is an exploded perspective view schematically showing a configuration of a main part of the light source device 5a according to the first embodiment.
  • the upper part of FIG. 17 is referred to as the “front side” of the display device, and the lower part is referred to as the “rear side”.
  • the light source device 5a that works on the first embodiment includes the chassis 51, the reflective sheet 52, the light source 21, the side holder 53, and any of the embodiments of the present invention.
  • the optical member 100a, the optical sheet 54, the frame 55, the light source drive circuit board 56, and the light source drive circuit board cover 57 are provided.
  • chassis 51 reflection sheet 52, light source 21, side holder 53, optical sheets 54, frame 55, light source drive circuit board 56, and light source drive circuit board cover 57 have a conventionally known general configuration. Is applicable. Therefore, these will be described briefly and detailed description will be omitted.
  • the chassis 51 is a substantially flat plate-like member, and is formed using, for example, a press caloe or the like with a metal plate material or the like.
  • the light source 21 may be, for example, a fluorescent tube such as a cold cathode tube or a hot cathode tube, or a discharge such as a xenon tube.
  • a fluorescent tube such as a cold cathode tube or a hot cathode tube
  • a discharge such as a xenon tube.
  • Various known linear light sources such as tubes can be applied.
  • a configuration in which a linear cold cathode tube is applied is shown.
  • a configuration in which two pairs of light sources are electrically connected in series, that is, a configuration using pseudo-u-tubes, is shown.
  • the optical member 100a has a light source insertion hole, a lateral high diffusion region and a front high diffusion region provided near one end in the axial direction of the light source insertion hole, A configuration in which a back surface high diffusion region is provided over the entire back surface side can be applied.
  • the cross-sectional area of the lateral high diffusion region and the front high diffusion region may be configured such that one end force in the axial direction of the light source insertion hole is also reduced (or increased) toward the other end.
  • the reflection sheet 52 is a sheet-like or plate-like member having a surface property that diffusely reflects light emitted from the light source 21.
  • the reflection sheet 52 is formed of, for example, foamed PET (polyethylene terephthalate).
  • the side holder 53 is a member that functions as a spacer or the like for disposing optical sheets 54 described later.
  • These side holders 53 are substantially rod-shaped members, and have a configuration in which they are integrally formed of a resin material, for example.
  • the optical sheets 54 refer to a sheet-like or plate-like member for adjusting the characteristics of light emitted from the light source 21, or a set of such members.
  • a diffusion plate and a diffusion sheet having a function of diffusing light emitted from a light source a lens sheet having a condensing function, light in a predetermined vibration direction and light in other vibration directions.
  • a polarizing reflection sheet that reflects the light. And it selects suitably according to the kind of light source device, etc., and uses them by stacking in a predetermined order.
  • the light source device 5a includes a lens sheet and a polarization reflection sheet as the optical sheets 54. Since the optical member 100a has the function of diffusing the light emitted from the light source, the diffusion plate and the diffusion sheet need not be provided. However, in order to prevent interference between the striped pattern appearing on the surface of the lens sheet or the polarizing reflection sheet and the non-turn such as the black matrix of the display panel (for example, the occurrence of moire fringes) A configuration in which a diffusion sheet is disposed between the lens sheet and the polarization reflection sheet may be employed. [0165]
  • the frame 55 is a member having a function of holding and Z or protecting the optical sheets 54, a display panel (not shown), and the like.
  • the frame 55 has an open substantially quadrilateral shape. And, for example, a structure that is integrally formed of a resin material, a structure that combines a plurality of parts that are formed of a resin material, a structure that is formed using a metal plate material by pressing, a metal plate material that is pressed, etc. It is possible to apply a configuration in which parts formed using the are combined.
  • the light source driving circuit board 56 is a circuit board on which an electronic circuit or an electric circuit for driving the light source 21, such as an inverter circuit, is constructed.
  • the light source drive circuit board cover 57 is a plate-like member that covers the light source drive circuit board 56, and is formed of a conductor such as a metal plate material, for example.
  • the assembly structure of the light source device 5a including such a member is as follows. First, the reflection sheet 52 is disposed on the front side of the chassis 51. Then, the light source 21 is inserted into the light source insertion hole of the optical member 100a and disposed on the front side of the reflection sheet 52.
  • the lateral high diffusion region and the front high diffusion region are provided.
  • the electrodes do not provide an electrode for applying AC voltage on the side! / Mutually on the side! Arrange the electrodes to be electrically connected to the cage. If the cross-sectional area of the horizontal high diffusion region and the front high diffusion region is such that the one end force in the axial direction of the light source insertion hole becomes smaller (or larger) toward the other end, the horizontal high diffusion region is used.
  • An electrode that applies an AC voltage is arranged on the side where the cross-sectional area of the region and the front high diffusion region is large, and electrodes that are electrically connected to each other are arranged if not provided.
  • the side holder 53 is disposed so as to cover the end portion of the light source 21.
  • An optical sheet 54 is arranged on the front side, and a frame 55 is mounted on the front side.
  • a light source drive circuit board 56 is disposed on the rear side of the chassis 51, and the harness drawn from the light source 21 and the light source drive circuit board 56 are electrically connected. Then, a light source drive circuit board cover 57 is attached so as to cover the light source drive circuit board 56.
  • FIG. 27 is an exploded perspective view schematically showing a configuration of a main part of the light source device 5b according to the second embodiment.
  • the light source device 5b according to the second embodiment and the light source device 5a according to the first embodiment differ only in the applied optical member and the assembly structure thereof, and others have a common configuration. Therefore, common configurations are denoted by the same reference numerals as in the first embodiment, and description thereof is omitted.
  • the optical member 100b has a light source insertion recess, and a lateral high diffusion region and a front high diffusion region are provided near one end in the axial direction of the light source insertion recess. Can be applied.
  • the cross-sectional area of the lateral high diffusion region and the front high diffusion region may be configured such that one end force in the axial direction of the light source insertion hole is reduced (or increased) toward the other end.
  • the assembly of the light source device 5b which is useful in the second embodiment, is as follows. First, the reflection sheet 52 is arranged on the front side of the chassis 51, and the light source 21 is arranged side by side on the front side. Then, the side holder 53 is mounted so as to cover the end of the light source 21 from the front side, and the optical member 100b is mounted so that the light source 21 fits in the light source insertion recess.
  • the light source is inserted into the light source insertion recess of the optical member 100b, and the optical member 100b into which the light source 21 is inserted is reflected on the reflection sheet 52.
  • positioned in the front side of may be sufficient.
  • the light emitted from the light source 21 diffuses in the high diffusion region provided in the optical member, and therefore the front force of the optical members 100a and 100b is also emitted. Can be prevented or suppressed. Details of the functions and effects of the optical members 100a and 100b are as described above. [0177] Further, since the light source 21 is held by the light source insertion hole or the inner wall surface of the light source insertion recess formed in the optical members 100a and 100b, it is not necessary to hold the light source 21 on the chassis 51 by the lamp clip. Therefore, it is possible to prevent a luminance difference due to the lamp clip.
  • the optical sheets 54 are supported on the entire surface by the front surfaces of the optical members 100a and 100b, the occurrence of bending and wrinkles can be prevented. Accordingly, it is possible to prevent the occurrence of luminance unevenness due to wrinkles and stagnation of the optical sheets 54.
  • FIG. 28 is an exploded perspective view schematically showing a configuration of a main part of the display device that is useful for the embodiment of the present invention.
  • a display device 6 according to an embodiment of the present invention includes a light source device 5a, 5b according to any one of the above embodiments (that is, a light source device to which any of the optical members according to each of the embodiments is applied),
  • a display panel 61, a bezel 62, a control circuit board 63, and a control circuit board cover 64 are provided.
  • Various known transmissive or transflective liquid crystal panels can be applied to the display panel 61.
  • an active matrix type liquid crystal panel can be applied.
  • the bezel 62 is a member having a function of protecting and Z or holding the display panel 61.
  • the bezel 62 has a substantially quadrangular shape with an opening. For example, a structure that is formed integrally with a resin material, a structure that is combined with a part that is formed of a resin material, a structure that is formed using a metal sheet and a press carriage, and a metal plate that is pressed. The structure which combines the components formed using can be applied.
  • the control circuit board 63 is a circuit board on which a circuit for generating a signal for controlling the display panel 61 is constructed based on an image signal input from the outside (for example, a tuner).
  • the control circuit board cover 64 is a member that covers the control circuit board 63, and is formed of a conductor such as metal.
  • the assembling structure of the display device 6 including such a member is as follows.
  • the display panel 61 is disposed on the front side of the frame 55 of the light source devices 5a and 5b. Then, attach the bezel 62 to the front side.
  • a control circuit board 63 is disposed on the back of the light source devices 5a and 5b, and a control circuit board cover 64 is attached so as to cover the control circuit board 63.
  • FIG. 29 is an exploded perspective view schematically showing a configuration of a main part of a television receiver including a display device according to an embodiment of the present invention.
  • the television receiver 7 includes a display device 6 and an embodiment of the present invention.
  • a tuner 71, a loudspeaker 73, a power source 72, cabinets 741 and 742, and a support rod 75 can be those commonly used in the related art, they will be briefly described and detailed descriptions thereof will be omitted.
  • the tuner 71 generates an image signal and an audio signal of a predetermined channel as well as the received broadcast radio wave and the image signal force inputted with the external force.
  • a conventional general terrestrial tuner analog terrestrial tuner, digital terrestrial tuner, or both
  • BS tuner, CS tuner, and the like can be applied.
  • the loudspeaker 73 emits voice based on the voice signal generated by the tuner 71.
  • a general spin force can be applied.
  • the power source 72 can supply power to the display device 6, the tuner 71, the loudspeaker 73, and the like according to the embodiment of the present invention.
  • FIG. 29 shows a configuration in which the cabinet includes a front cabinet 741 and a back cabinet 742, and the display device 6, the tuner 71, the loudspeaker 73, and the power source 72 according to the embodiment of the present invention are housed between these cabinets. .
  • the tuner 71, the loudspeaker 73, and the power source 72 may be assembled to the display device 6 that is useful in the embodiment of the present invention.

Abstract

L'invention concerne un élément optique, un dispositif à sources lumineuses et un écran dans lequel les différences de luminance peuvent être empêchées ou supprimées. Une pluralité de trous d'insertion de sources lumineuses (1015) ou de renfoncements d'insertion de sources lumineuses de type tranchées dans laquelle une source lumineuse linéaire peut être insérée est formée, et une zone de diffusion élevée latérale (1017) présentant un degré supérieur de diffusion de la lumière par rapport à d'autres zones est disposée au moins partiellement entre les faces de paroi intérieure de trous d'insertion de sources lumineuses (1015) ou de renfoncements d'insertion de sources lumineuses adjacents et au moins partiellement entre les trous d'insertion de sources lumineuses (1015) ou les renfoncements d'insertion de sources lumineuses au niveau des extrémités opposées et d'une face latérale extérieure (1013).
PCT/JP2007/058453 2006-09-01 2007-04-18 Element optique, dispositif a sources lumineuses et ecran WO2008026346A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006-238181 2006-09-01
JP2006238181 2006-09-01

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06186560A (ja) * 1992-12-16 1994-07-08 Yasuhiro Koike 光散乱導光体及び光散乱導光光源装置
JP2001133779A (ja) * 1999-11-08 2001-05-18 Hitachi Ltd 液晶表示装置
JP2002208307A (ja) * 2000-07-31 2002-07-26 Matsushita Electric Ind Co Ltd 照明装置、画像表示装置、液晶モニタ、液晶テレビ、液晶情報端末、及び導光板の製造方法
WO2004031647A1 (fr) * 2002-09-30 2004-04-15 Sharp Kabushiki Kaisha Unite de retroeclairage et afficheur a cristaux liquides l'utilisant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06186560A (ja) * 1992-12-16 1994-07-08 Yasuhiro Koike 光散乱導光体及び光散乱導光光源装置
JP2001133779A (ja) * 1999-11-08 2001-05-18 Hitachi Ltd 液晶表示装置
JP2002208307A (ja) * 2000-07-31 2002-07-26 Matsushita Electric Ind Co Ltd 照明装置、画像表示装置、液晶モニタ、液晶テレビ、液晶情報端末、及び導光板の製造方法
WO2004031647A1 (fr) * 2002-09-30 2004-04-15 Sharp Kabushiki Kaisha Unite de retroeclairage et afficheur a cristaux liquides l'utilisant

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