WO2012081183A1 - Backlight device and liquid-crystal display device - Google Patents

Backlight device and liquid-crystal display device Download PDF

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Publication number
WO2012081183A1
WO2012081183A1 PCT/JP2011/006747 JP2011006747W WO2012081183A1 WO 2012081183 A1 WO2012081183 A1 WO 2012081183A1 JP 2011006747 W JP2011006747 W JP 2011006747W WO 2012081183 A1 WO2012081183 A1 WO 2012081183A1
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WIPO (PCT)
Prior art keywords
light
light source
source unit
crystal display
light emitting
Prior art date
Application number
PCT/JP2011/006747
Other languages
French (fr)
Japanese (ja)
Inventor
大三郎 松木
林　克彦
長谷川　賢治
山口　博史
Original Assignee
パナソニック株式会社
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
Priority claimed from JP2010280137A external-priority patent/JP2014038698A/en
Priority claimed from JP2010280134A external-priority patent/JP2014038697A/en
Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Publication of WO2012081183A1 publication Critical patent/WO2012081183A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
    • G02B19/0028—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed refractive and reflective surfaces, e.g. non-imaging catadioptric systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
    • G02B19/0061—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED
    • G02B19/0066—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED in the form of an LED array
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0096—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the lights guides being of the hollow type
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0045—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide
    • G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements

Definitions

  • the present invention relates to a backlight device and a liquid crystal display device using a light emitting diode as a light source.
  • the backlight device of a conventional large liquid crystal display device a large number of cold cathode tubes are arranged directly under the liquid crystal panel, and these cold cathode tubes are used together with members such as a diffusion plate and a reflector.
  • light emitting diodes have been used as light sources for backlight devices.
  • Light-emitting diodes have been improved in efficiency in recent years, and are expected as light sources with low power consumption instead of fluorescent lamps.
  • the power consumption of the liquid crystal display device can be reduced by controlling the brightness of the light emitting diodes according to the image.
  • Patent Document 1 proposes a lens that can obtain a uniform surface light source even with a small number of light emitting diodes. Has been.
  • a light source having a plurality of point light sources arranged one-dimensionally as in Patent Document 2 and a long cylindrical lens provided on the plurality of point light sources is also known.
  • the present invention has been made in view of such a current situation, and provides a backlight device and a liquid crystal display device with a simple configuration and an inexpensive structure while ensuring sufficient brightness in a backlight device using a light emitting diode. Objective.
  • the backlight device of the present invention includes a light source unit including a plurality of light emitting diodes and a lens that expands light from the light emitting diodes, a housing for housing the light source unit,
  • a backlight device comprising: a diffuser plate disposed so as to cover an opening of a housing; and a reflection sheet that reflects light emitted from the light source unit toward the diffuser plate, wherein the plurality of light source units
  • Each of the light emitting diodes is arranged in one or a plurality of rows at the center, and the lens has an incident surface on which light from the light emitting diode is incident and an output surface on which the incident light is expanded and emitted.
  • the diffusion plate is characterized in that a cylindrical lens portion is formed on the irradiated surface.
  • the backlight device of the present invention covers a light source unit including a plurality of light emitting diodes and a lens that expands light from the light emitting diodes, a housing that houses the light source units, and an opening of the housing. And a reflection sheet that reflects the light emitted from the light source unit to the diffusion plate side, wherein the plurality of light emitting diodes of the light source unit are arranged in the center.
  • the lens is arranged in one or a plurality of rows, and the lens has an incident surface on which light from a light emitting diode is incident and an exit surface that expands and emits the incident light, and the diffuser plate A transmittance distribution layer is provided on the irradiated surface so that the transmittance is lower at the center side corresponding to the light source portion and higher at the peripheral side.
  • the liquid crystal display device of the present invention comprises a liquid crystal display panel and a backlight device disposed on the back side of the liquid crystal display panel and having a size corresponding to the liquid crystal display panel.
  • a light source unit comprising a light-emitting diode and a lens for expanding light from the light-emitting diode, a housing for housing the light source unit, a diffuser plate arranged to cover an opening of the housing, and the light source unit
  • a liquid crystal display device including a reflection sheet that reflects light emitted from the diffuser to the diffuser plate side, wherein the plurality of light emitting diodes of the light source unit are arranged in a single row or a plurality of rows in a central portion,
  • the lens has an incident surface on which light from the light emitting diode is incident and an exit surface that expands and emits the incident light, and the diffuser plate forms a cylindrical lens portion on the irradiated surface. It is characterized in.
  • the liquid crystal display device of the present invention comprises a liquid crystal display panel and a backlight device disposed on the back side of the liquid crystal display panel and having a size corresponding to the liquid crystal display panel.
  • a light source unit comprising a light-emitting diode and a lens for expanding light from the light-emitting diode, a housing for housing the light source unit, a diffuser plate arranged to cover an opening of the housing, and the light source unit
  • a liquid crystal display device including a reflection sheet that reflects light emitted from the diffuser to the diffuser plate side, wherein the plurality of light emitting diodes of the light source unit are arranged in a single row or a plurality of rows in a central portion,
  • the lens has an incident surface on which light from the light emitting diode is incident and an exit surface that expands and emits the incident light
  • the diffuser plate has a transmittance toward a central portion corresponding to the light source unit.
  • Ku characterized in that a transmittance distribution
  • the light source unit is configured by arranging a plurality of lenses in a straight line so as to face the central part of the liquid crystal display panel. It is possible to provide an inexpensive backlight device and liquid crystal display device with a simple configuration while ensuring the above.
  • FIG. 1 is an exploded perspective view showing an overall schematic configuration of a liquid crystal display device using a backlight device according to an embodiment of the present invention.
  • 2 is a cross-sectional view taken along line A1-A1 of FIG.
  • FIG. 3 is a plan view showing a light source unit of the backlight device.
  • 4 is a cross-sectional view taken along line A2-A2 of FIG.
  • FIG. 5 is an explanatory diagram for explaining a basic configuration of the light source unit in the backlight device according to the embodiment of the present invention.
  • FIG. 6 is a cross-sectional view of the lens viewed from the side surface in the arrangement direction.
  • FIG. 7 is an explanatory diagram for explaining the optical path of the lens.
  • FIG. 8 is a sectional view showing a specific example of the lens.
  • FIG. 1 is an exploded perspective view showing an overall schematic configuration of a liquid crystal display device using a backlight device according to an embodiment of the present invention.
  • 2 is a cross-sectional view taken
  • FIG. 9 is a cross-sectional view showing another specific example of the lens.
  • FIG. 10 is a diagram showing the light distribution characteristics of the lens shown in FIG.
  • FIG. 11 is a diagram showing the light distribution characteristics of the lens shown in FIG.
  • FIG. 12 is a plan view illustrating an example of an arrangement of lenses.
  • FIG. 13 is a plan view showing an example of the diffusion plate.
  • FIG. 14 is a plan view showing an example of the diffusion plate, a cross-sectional view in the X direction, and a cross-sectional view in the Y direction.
  • FIG. 1 is an exploded perspective view showing an overall schematic configuration of a liquid crystal display device using a backlight device according to an embodiment of the present invention
  • FIG. 2 is a cross-sectional view taken along line A1-A1 of FIG.
  • the liquid crystal display device is a rectangular flat plate-shaped transmissive liquid crystal display panel 1 and is disposed on the back side of the liquid crystal display panel 1 and has a size corresponding to the liquid crystal display panel 1. And a rectangular parallelepiped backlight device 2.
  • the backlight device 2 includes a light source unit 3 arranged in a straight line so as to face the central part of the liquid crystal display panel 1 along the long side direction of the liquid crystal display panel 1, and a rectangular parallelepiped shape that accommodates the light source unit 3.
  • the casing 4 is disposed so as to cover the opening 6 a of the casing 4, and the diffuser plate 5 disposed between the liquid crystal display panel 1 and the light source unit 3, and the light source unit 3 emits light.
  • a reflection sheet 6 that reflects light to the liquid crystal display panel 1 side, that is, the diffusion plate 5 side is provided.
  • the diffusion plate 5 includes an optical sheet laminate 7 having a size corresponding to the liquid crystal display panel 1 on the front side between the diffusion plate 5 and the liquid crystal display panel 1.
  • the optical sheet laminate 7 includes, for example, a prism sheet that condenses incident light from the diffusion plate 5 toward the front liquid crystal display panel 1, a diffusion sheet that further diffuses incident light from the diffusion plate 5, and incident light.
  • the polarizing plane of the liquid crystal display panel 1 corresponds to the polarizing plane of the liquid crystal display panel 1 and is configured by a polarizing sheet or the like that transmits light having a specific polarizing plane.
  • FIG. 3 is a plan view showing a light source part of the backlight device
  • FIG. 4 is a cross-sectional view taken along line A2-A2 of FIG.
  • the light source unit 3 mounts a plurality of light emitting diodes 9 at predetermined intervals on the surface of a strip-shaped insulating substrate 8 having a predetermined wiring pattern formed on the back side, and corresponds to each light emitting diode 9.
  • a plurality of substantially semi-cylindrical lenses 10 obtained by cutting the cylinder in half in the major axis direction are arranged so as to cover the light emitting diode 9.
  • the light emitting diode 9 is covered with a sealing resin such as an epoxy resin or silicon rubber so as not to come into contact with air.
  • the lens 10 extends the light from the light emitting diode 9 as a light source and irradiates the irradiated object, and is made of a transparent material having a refractive index of about 1.4 to 2.0, for example.
  • a transparent material constituting the lens 10 epoxy resin, silicon resin, acrylic resin, polycarbonate or other resin, glass, or rubber such as silicon rubber can be used. Among them, it is preferable to use an epoxy resin or silicon rubber used as a resin for sealing a light emitting diode.
  • FIGS. 1 to 4 show an example in which the light source unit 3 has a plurality of lenses 10 arranged in a row so as to correspond to the light emitting diodes 9 respectively.
  • the light emitting diodes 9 and the plurality of lenses 10 may be arranged in a plurality of rows so as to form two rows or three rows, and the arrangement shape in the case of arranging in a plurality of rows is also an adjacent row. You may arrange so that it may become a zigzag pattern between. In short, it may be arranged in a straight line so as to face only the central portion of the liquid crystal display panel 1.
  • the light source unit 3 is arranged so as to face the central part of the liquid crystal display panel 1, so that it is arranged only in the substantially central part of the backlight device 2.
  • FIGS. 5 to 13 are applied to the case where the plurality of light emitting diodes 9 are arranged in a single row as well as in the case of a plurality of rows as described above.
  • FIG. 5 is a diagram for explaining a basic configuration of the light source unit 3 in the backlight device according to the embodiment of the present invention.
  • FIG. 6 is a cross-sectional view of the lens viewed from the side surface in the arrangement direction.
  • the light-emitting diode 9 and the lens 10 which are light sources are arranged so that their optical axes Z coincide with each other.
  • the lens 10 extends the light from the light emitting diode 9 to irradiate the irradiated surface G, and the illuminance distribution of the irradiated surface G is maximum on the optical axis Z that is the design center line of the lens 10. It decreases almost monotonously as you go around.
  • the lens 10 has an incident surface 11 on which light from the light emitting diode 9 is incident, and an output surface 12 that emits the incident light.
  • the lens 10 also has a bottom surface 13 that faces the light exit surface 12 around the entrance surface 11. Further, an outer edge portion 14 that protrudes outward is provided between the emission surface 12 and the bottom surface 13, and the periphery of the emission surface 12 and the bottom surface 13 are connected by the outer surface of the outer edge portion 14.
  • the outer edge portion 14 may not be provided, and the periphery of the emission surface 12 and the bottom surface 13 may be connected by a linear or arcuate end surface.
  • the light from the light emitting diode 9 enters the lens 10 from the incident surface 11 and is then emitted from the emission surface 12 to reach the irradiated surface G.
  • the light emitted from the light emitting diode 9 is incident on the incident surface. 11 and the action of the exit surface 12, and reach a wide range of the illuminated surface G.
  • the incident surface 11 of the lens 10 is a continuous concave surface, and the projected shape from the upper surface is an ellipse with respect to the optical axis Z.
  • the bottom surface 13 around the incident surface 11 is a flat plane, but a pyramidal processed surface, a sliding processed surface, or the like may be formed on the bottom surface 13.
  • the exit surface 12 of the lens 10 has a substantially arcuate shape having a convex surface portion in which the projection shape viewed from the upper surface and the front surface is a quadrangle such as a rectangle and the projection shape viewed from the side surface in the arrangement direction of the lenses 10 is continuous. .
  • the curvature of the central portion when viewed from the side surface is substantially zero.
  • the “center portion” refers to a region within a predetermined radius from the optical axis Z, for example, within 1/10 of the outermost radius (effective diameter) of the emission surface 12 when viewed from the optical axis direction.
  • “Substantially zero” means that when the distance measured in the optical axis direction from the base point Q on the optical axis Z to any point on the exit surface 12 is the sag amount (sagY), The difference in the minimum sag amount is 0.1 mm or less. With such a shape, it becomes easy to mold and it is possible to make a lens that is resistant to tolerances.
  • the exit surface 12 of the lens 10 has a curvature C of a minute section on the exit surface 120 in the cross section including the optical axis outside the center M between xy that is between the convex portions. It is formed in the shape which becomes the maximum at the position.
  • ⁇ i represents the position of the minute section, and the angle between the line Li connecting the center of the minute section and the light source position on the optical axis Z and the optical axis Z, that is, ⁇ i ⁇ ( ⁇ i ( n + 1) + ⁇ i (n)) / 2.
  • the exit surface 12 of the lens 10 according to the present invention has a cross section including the optical axis viewed from the side surface in the arrangement direction, and the curvature C of a minute section on the exit surface 12 is defined by 60 ° ⁇ i ⁇ 80 °. It is configured to be the maximum within the range. More preferably, the curvature C of the minute section on the emission surface 12 may be configured to be maximum within a range defined by 65 ° ⁇ i ⁇ 75 °.
  • the curvature C of the minute section will be described with reference to FIGS. 6 and 7A and 7B.
  • the curvature C of the minute section is defined as follows.
  • the “light source position on the optical axis” is a position where the optical axis intersects the light emitting surface of the light source.
  • the nth minute section from the optical axis between point A and point B on the emission surface 12 is considered, and the light source position on point A and the optical axis
  • the angle between the line connecting the optical axis and the optical axis is ⁇ i (n)
  • the angle between the line connecting point B and the light source position on the optical axis and the optical axis is ⁇ i (n + 1).
  • ⁇ i (n + 1) ⁇ i (n) is about 0.1 °.
  • the angle formed by the tangent line of the exit surface 12 at point A and the plane perpendicular to the optical axis is ⁇ s (n)
  • the angle formed by the tangent line of the exit surface 12 at point B and the plane perpendicular to the optical axis is ⁇ s (n + 1).
  • the length of the emission surface 120 between point A and point B is assumed to be ⁇ d (n). Assuming that the exit surface 12 between the points A and B has a single radius of curvature R, assuming that the distance between the points A and B is sufficiently small, the center O of R is the exit surface 12 at the point A.
  • the normal of the exit surface 12 at point B intersect, and the angle ⁇ AOB formed by the two normals can be expressed as ⁇ s (n + 1) ⁇ s (n).
  • the radius R of the arc between point A and point B centered on O can be expressed as ⁇ d (n) / ( ⁇ s (n + 1) ⁇ s (n)).
  • the curvature C is 1 / R. Therefore, the curvature C of the nth minute section is ( ⁇ s (n + 1) ⁇ s (n)) / ⁇ d (n). However, ⁇ s (n) and ⁇ s (n + 1) are calculated in radians.
  • the sign of the curvature C is positive when the center of curvature O is on the light source side with respect to the emission surface 12 and negative when it is on the opposite side.
  • the exit surface 12 of the lens 10 has an angle between a straight line connecting an arbitrary point on the exit surface 12 and a base point Q on the optical axis Z and the optical axis Z as ⁇ , and a base point on the optical axis Z.
  • the exit surface 12 is in the range of 10 ° ⁇ min ⁇ 30 °, where ⁇ min is ⁇ min when the curvature C of the minute section on the exit surface 12 is minimum except in the vicinity of the optical axis Z. It is preferable to satisfy.
  • the Fresnel reflection component that fluctuates simultaneously as the size of the light emitting diode 9 changes is reduced. Further, if the ⁇ min at which the curvature C of the minute section on the emission surface 12 is minimum exceeds the lower limit of the range of 10 ° ⁇ min ⁇ 30 °, the above-described Fresnel reflection component is likely to occur, and if the upper limit is exceeded, The size of the lens 10, for example, the length in the optical axis direction becomes too large.
  • the lens 8 to 11 show specific examples of the lens 10. Note that this is an example in which a general-purpose light emitting diode is used as a light source and the directivity is expanded.
  • the size of the light emitting surface of the light emitting diode is, for example, 3.0 ⁇ 3.0 mm, and 1.0 ⁇ 1. 0.0 mm or 3.0 ⁇ 1.0 mm may be used.
  • ⁇ is an angle between the optical axis Z and a straight line connecting the base point Q on the optical axis Z and arbitrary points on the incident surface 11 and the outgoing surface 12.
  • sagX in the figure is a distance measured in the optical axis direction from a base point Q on the optical axis Z to an arbitrary point on the incident surface 11, and sagY is the exit surface from the base point Q on the optical axis Z.
  • 12 is a distance measured in the optical axis direction up to an arbitrary point on 12.
  • Figure 10 is a lens 10 of the embodiment shown in FIG. 8, and theta, a graph of the sagX and sagY, sagY shows that a shape monotonically decreasing the sagY 0 as the maximum.
  • a graph of the sagX and sagY, sagY shows that a shape monotonically decreasing the sagY 0 as the maximum.
  • the light source unit 3 is configured by arranging a plurality of substantially semi-cylindrical lenses 10.
  • the light source unit 3 has a long length corresponding to the length of the long side of the liquid crystal display panel 1.
  • the lens 10 may be used.
  • a plurality of light emitting diodes 9 are arranged, and a plurality of incident surfaces 11 corresponding to the light emitting diodes 9 are formed.
  • the long lenses 10 may be provided in a plurality of rows according to the number of light emitting diodes, or the plurality of light emitting diodes 9 are arranged in a row.
  • one long lens may be provided as a configuration in which the incident surface 11 corresponding to each of the plurality of light emitting diodes 9 is formed.
  • molding is easy, and it can produce at low cost.
  • the liquid crystal display panel 1 having a different screen size can be dealt with by adjusting the number of the lenses 10 arranged in the long side direction of the liquid crystal display panel 1, and the liquid crystal display device can be provided at a low cost. Is possible.
  • the light source unit 3 has a relationship between the length L in the arrangement direction of the lenses 10 having the configuration shown in FIG. 5 and the interval l between the adjacent lenses 10. Are arranged so that L ⁇ l and the distance l between the lenses 10 is substantially equal. With such a configuration, sufficient brightness as a backlight device can be ensured, and the light source unit 3 can be configured with a small number of lenses 10, and the device can be configured at low cost.
  • the present inventors have confirmed through experiments.
  • the light emitting diode 9 having a large output may be used, but the price becomes high.
  • the liquid crystal display device is required to have a brighter central portion of the screen than the peripheral portion.
  • the arrangement intervals of the individual lenses 10 in the central part 3a and the peripheral part 3b are narrowly arranged closely, and between the central part 3a and the peripheral part 3b.
  • the arrangement interval of the individual lenses 10 in the intermediate portion 3c is arranged so as to be wider than the central portion 3a and the peripheral portion 3b.
  • the boundary between the central part 3a and the intermediate part 3c and the boundary between the intermediate part 3c and the peripheral part 3b are arranged so that the distance between the lenses 10 gradually changes.
  • the light source unit 3 is configured by arranging a plurality of lenses 10 linearly so as to face the central part of the liquid crystal display panel 1, so that the liquid crystal display panel 1 having different screen sizes can be provided.
  • the long side direction of the liquid crystal display panel 1 can be dealt with by adjusting the number of the lenses 10 arranged, but the brightness of the entire screen including the short side direction of the liquid crystal display panel 1 is According to the results confirmed by the inventors through experiments, it was found that the external shape of the lens 10 and the arrangement interval of the lenses 10 can be sufficiently satisfied by satisfying predetermined conditions.
  • the length of the short side of the lens 10 orthogonal to the arrangement direction of the lenses 10 is d1 and the minimum interval of the arrangement interval 1 of the lenses 10 is d3, d3 ⁇ (2 ⁇
  • d1 the minimum interval of the arrangement interval 1 of the lenses 10
  • d2 the length of the long side in the arrangement direction of the lenses 10
  • d1 the thickness of the lens 10 on the optical axis Z
  • d0 it is preferable to combine the conditions of d0 ⁇ (d1 / 3).
  • the diffusion plate 5 emits light in a state where the light irradiated on the irradiated surface G that is the back surface on the light source unit 3 side is diffused from the surface on the front surface side.
  • Each light source of the light source unit 3, that is, the lens 10 irradiates the irradiated surface G of the diffusing plate 5 with light having a uniform illuminance over a wide range, and the light is diffused by the diffusing plate 5, thereby A surface light source with less luminance unevenness can be obtained.
  • Light from the light source unit 3 is scattered by the diffusion plate 5 and returns to the light source unit 3 side or passes through the diffusion plate 5.
  • the light that returns to the light source unit 3 and enters the reflection sheet 6 is reflected by the reflection sheet 6 and enters the diffusion plate 5 again.
  • Such a diffusion plate 5 is made of, for example, a plate-like body such as an acrylic resin, and has a concavo-convex shape on the surface in order to diffuse light incident from one surface and emit the light from the other surface. It is comprised by the translucent resin board which disperse
  • the diffusion plate 5 is a cover that is the back surface on the light source unit 3 side so that the transmittance is lower toward the center side corresponding to the light source unit 3 and higher toward the peripheral side.
  • a transmittance distribution layer 5a is provided on the irradiation surface G.
  • the transmittance distribution layer 5a is formed of a reflecting member made of white ink containing a white pigment, and the reflection pattern has a larger area occupancy at the center side and a smaller area occupancy at the periphery side. Is formed.
  • the white ink is composed of ink in which fine powder made of a high refractive index transparent material such as titanium oxide is dispersed in a transparent binder, and a transmittance distribution layer 5a having a predetermined pattern is formed by screen printing.
  • the appropriate luminance distribution can be realized with a relatively thin structure of about 50 mm while suppressing light emission from the central portion.
  • a cylindrical lens portion 5 b is formed on the irradiated surface G that is the back surface on the light source portion 3 side. Good.
  • the diffusion plate 5 when the horizontal direction of the diffusion plate 5 is X and the vertical direction is Y, the diffusion plate 5 has a curvature such as an anamorphic curved surface in the X direction and the Y direction, and the diffusion plate 5 is formed so that the thickness of the four corners is reduced.
  • a cylindrical lens portion 5b is formed on the irradiated surface G which is the back surface of the plate 5 on the light source portion 3 side.
  • the diffusion plate 5 according to the present invention in which the cylindrical lens portion 5b having an anamorphic curved surface is formed and the diffusion plate 5 of the comparative example in which no curved surface is formed are manufactured. 1 and FIG. 2, the respective luminances were obtained, and the luminance distribution with respect to the center value was measured. As a result, the diffusion plate 5 according to the present invention has four corner values as compared with the comparative example. It was found that the improvement was about 5%.
  • the cylindrical lens portion 5b having a predetermined light distribution characteristic on the irradiated surface G that is the back surface of the diffusion plate 5 on the light source portion 3 side, a backlight device having a desired luminance distribution is realized. be able to.
  • the curved surface shape of the diffusion plate 5 is formed with an anamorphic curved surface, it may be configured with other free curved surfaces.
  • the diffusing plate 5 may be configured by bonding the curved cylindrical lens and a flat plate member.
  • the reflection sheet 6 has a substantially cylindrical surface shape that is curved toward the long side end of the backlight device 2 with the light source unit 3 as the center. In this configuration, openings 6 a are provided at portions corresponding to the individual lenses 10 of the light source unit 3.
  • the angle is within the range of 60 ° ⁇ ⁇ m ⁇ 80 ° with respect to the optical axis Z of the lens 10 of the light source unit 3.
  • a plurality of lenses 10 are arranged linearly so as to face the central portion of the liquid crystal display panel 1 as shown in FIGS.
  • the line connecting the central portion of the reflection sheet 6 and the curved tip portion of the reflection sheet 6 is 60 with respect to the optical axis Z of the lens 10 of the light source unit 3.
  • the shape of the reflection sheet 6 is curved toward the long side end of the backlight device 2 with the light source unit 3 as the center, but is not a curved shape.
  • a linear shape may be sufficient.
  • the light source unit is configured by arranging a plurality of lenses in a straight line so as to face the central part of the liquid crystal display panel.
  • the invention is useful for obtaining an inexpensive backlight device and liquid crystal display device with a simple configuration while ensuring sufficient brightness.

Abstract

A backlight device (2) provided with: a light-source unit (3) comprising a plurality of light-emitting diodes (9) and lenses (10) that spread the light from said light-emitting diodes (9); a housing (4) that contains said light-source unit (3); a diffusion panel (5) disposed so as to cover an opening (6a) in said housing (4); and a reflective sheet (6) that reflects light from the light-source unit (3) towards the diffusion panel (5). The light-emitting diodes (9) are arranged in one or more rows in the middle of the light-source unit (3). The lenses (10) in the light-source unit (3) have input surfaces (11) onto which the light from the light-emitting diodes (9) is incident and output surfaces (12) from which the incident light, having been spread out, is transmitted. A transmittance distribution layer (5a) is provided on the illuminated surface (G) of the diffusion panel (5) such that the transmittance of said diffusion panel increases with increasing distance from the part thereof corresponding to the center of the light-source unit (3).

Description

バックライト装置および液晶表示装置Backlight device and liquid crystal display device
　本発明は、発光ダイオードを光源として用いるバックライト装置および液晶表示装置に関するものである。 The present invention relates to a backlight device and a liquid crystal display device using a light emitting diode as a light source.
　従来の大型の液晶表示装置のバックライト装置では、冷陰極管が液晶パネル直下に多数配置され、これらの冷陰極管が拡散板や反射板等の部材と共に使われていた。また、近年では、バックライト装置の光源として発光ダイオードが使用されるようになっている。発光ダイオードは近年効率が向上し、蛍光灯に変わる消費電力の少ない光源として期待されている。また液晶表示装置用の光源としては映像に応じて発光ダイオードの明暗を制御することで液晶表示装置の消費電力を下げることができる。 In the backlight device of a conventional large liquid crystal display device, a large number of cold cathode tubes are arranged directly under the liquid crystal panel, and these cold cathode tubes are used together with members such as a diffusion plate and a reflector. In recent years, light emitting diodes have been used as light sources for backlight devices. Light-emitting diodes have been improved in efficiency in recent years, and are expected as light sources with low power consumption instead of fluorescent lamps. Further, as a light source for a liquid crystal display device, the power consumption of the liquid crystal display device can be reduced by controlling the brightness of the light emitting diodes according to the image.
　液晶表示装置において、発光ダイオードを光源とするバックライト装置では、冷陰極管の代わりに多数の発光ダイオードを配置することとなる。多数の発光ダイオードを用いることで、バックライト装置表面で均一な明るさを得ることができるが、発光ダイオードが多数必要で安価にできない問題があった。１個の発光ダイオードの出力を大きくし、発光ダイオードの使用する個数を減らす取り組みがなされており、例えば特許文献１では、少ない個数の発光ダイオードでも均一な面光源が得られるようにするレンズが提案されている。 In a backlight device using a light emitting diode as a light source in a liquid crystal display device, a large number of light emitting diodes are arranged instead of the cold cathode tubes. By using a large number of light emitting diodes, a uniform brightness can be obtained on the surface of the backlight device, but there is a problem that a large number of light emitting diodes are required and cannot be made inexpensive. Efforts have been made to increase the output of one light emitting diode and reduce the number of light emitting diodes used. For example, Patent Document 1 proposes a lens that can obtain a uniform surface light source even with a small number of light emitting diodes. Has been.
　また、特許文献２のように１次元的に並べて配置された複数の点光源と、その複数の点光源上に設けられた、長い形状のシリンドリカルレンズとを有する光源も知られている。 Also, a light source having a plurality of point light sources arranged one-dimensionally as in Patent Document 2 and a long cylindrical lens provided on the plurality of point light sources is also known.
日本国特許公報「特許第３８７５２４７号公報」Japanese Patent Publication “Patent No. 3875247” 日本国公開特許公報「特開２００６－２８６６０８号公報」Japanese Patent Publication “Japanese Patent Laid-Open No. 2006-286608”
　本発明はこのような現状に鑑みなされたもので、発光ダイオードを用いたバックライト装置において、十分な明るさを確保しながら簡単な構成で安価なバックライト装置および液晶表示装置を提供することを目的とする。 The present invention has been made in view of such a current situation, and provides a backlight device and a liquid crystal display device with a simple configuration and an inexpensive structure while ensuring sufficient brightness in a backlight device using a light emitting diode. Objective.
　このような目的を達成するために本発明のバックライト装置は、複数個の発光ダイオードおよびこの発光ダイオードからの光を拡張するレンズからなる光源部と、この光源部を収容する筐体と、この筐体の開口部を覆うように配置される拡散板と、前記光源部から出射した光を前記拡散板側に反射させる反射シートとを備えたバックライト装置であって、前記光源部の前記複数個の発光ダイオードは、中央部に一列または複数列に配列されており、前記レンズは、発光ダイオードからの光が入射する入射面と、入射した光を拡張して出射する出射面とを有し、前記拡散板は、被照射面にシリンドリカルレンズ部を形成したことを特徴とする。 In order to achieve such an object, the backlight device of the present invention includes a light source unit including a plurality of light emitting diodes and a lens that expands light from the light emitting diodes, a housing for housing the light source unit, A backlight device comprising: a diffuser plate disposed so as to cover an opening of a housing; and a reflection sheet that reflects light emitted from the light source unit toward the diffuser plate, wherein the plurality of light source units Each of the light emitting diodes is arranged in one or a plurality of rows at the center, and the lens has an incident surface on which light from the light emitting diode is incident and an output surface on which the incident light is expanded and emitted. The diffusion plate is characterized in that a cylindrical lens portion is formed on the irradiated surface.
　また、本発明のバックライト装置は、複数個の発光ダイオードおよびこの発光ダイオードからの光を拡張するレンズからなる光源部と、この光源部を収容する筐体と、この筐体の開口部を覆うように配置される拡散板と、前記光源部から出射した光を前記拡散板側に反射させる反射シートとを備えたバックライト装置であって、前記光源部の前記複数個の発光ダイオードは、中央部に一列または複数列に配列されており、前記レンズは、発光ダイオードからの光が入射する入射面と、入射した光を拡張して出射する出射面とを有し、前記拡散板は、前記光源部に対応する中央部側ほど透過率が低く、周辺部側ほど透過率が高くなるように被照射面に透過率分布層を設けたことを特徴とする。 In addition, the backlight device of the present invention covers a light source unit including a plurality of light emitting diodes and a lens that expands light from the light emitting diodes, a housing that houses the light source units, and an opening of the housing. And a reflection sheet that reflects the light emitted from the light source unit to the diffusion plate side, wherein the plurality of light emitting diodes of the light source unit are arranged in the center. The lens is arranged in one or a plurality of rows, and the lens has an incident surface on which light from a light emitting diode is incident and an exit surface that expands and emits the incident light, and the diffuser plate A transmittance distribution layer is provided on the irradiated surface so that the transmittance is lower at the center side corresponding to the light source portion and higher at the peripheral side.
　また、本発明の液晶表示装置は、液晶表示パネルと、この液晶表示パネルの背面側に配置され、液晶表示パネルに対応する大きさのバックライト装置とからなり、前記バックライト装置は、複数個の発光ダイオードおよびこの発光ダイオードからの光を拡張するレンズからなる光源部と、この光源部を収容する筐体と、この筐体の開口部を覆うように配置される拡散板と、前記光源部から出射した光を前記拡散板側に反射させる反射シートとを備えた液晶表示装置であって、前記光源部の前記複数個の発光ダイオードは、中央部に一列または複数列に配列されており、前記レンズは、発光ダイオードからの光が入射する入射面と、入射した光を拡張して出射する出射面とを有し、前記拡散板は、被照射面にシリンドリカルレンズ部を形成したことを特徴とする。 The liquid crystal display device of the present invention comprises a liquid crystal display panel and a backlight device disposed on the back side of the liquid crystal display panel and having a size corresponding to the liquid crystal display panel. A light source unit comprising a light-emitting diode and a lens for expanding light from the light-emitting diode, a housing for housing the light source unit, a diffuser plate arranged to cover an opening of the housing, and the light source unit A liquid crystal display device including a reflection sheet that reflects light emitted from the diffuser to the diffuser plate side, wherein the plurality of light emitting diodes of the light source unit are arranged in a single row or a plurality of rows in a central portion, The lens has an incident surface on which light from the light emitting diode is incident and an exit surface that expands and emits the incident light, and the diffuser plate forms a cylindrical lens portion on the irradiated surface. It is characterized in.
　また、本発明の液晶表示装置は、液晶表示パネルと、この液晶表示パネルの背面側に配置され、液晶表示パネルに対応する大きさのバックライト装置とからなり、前記バックライト装置は、複数個の発光ダイオードおよびこの発光ダイオードからの光を拡張するレンズからなる光源部と、この光源部を収容する筐体と、この筐体の開口部を覆うように配置される拡散板と、前記光源部から出射した光を前記拡散板側に反射させる反射シートとを備えた液晶表示装置であって、前記光源部の前記複数個の発光ダイオードは、中央部に一列または複数列に配列されており、前記レンズは、発光ダイオードからの光が入射する入射面と、入射した光を拡張して出射する出射面とを有し、前記拡散板は、前記光源部に対応する中央部側ほど透過率が低く、周辺部側ほど透過率が高くなるように被照射面に透過率分布層を設けたことを特徴とする。 The liquid crystal display device of the present invention comprises a liquid crystal display panel and a backlight device disposed on the back side of the liquid crystal display panel and having a size corresponding to the liquid crystal display panel. A light source unit comprising a light-emitting diode and a lens for expanding light from the light-emitting diode, a housing for housing the light source unit, a diffuser plate arranged to cover an opening of the housing, and the light source unit A liquid crystal display device including a reflection sheet that reflects light emitted from the diffuser to the diffuser plate side, wherein the plurality of light emitting diodes of the light source unit are arranged in a single row or a plurality of rows in a central portion, The lens has an incident surface on which light from the light emitting diode is incident and an exit surface that expands and emits the incident light, and the diffuser plate has a transmittance toward a central portion corresponding to the light source unit. Ku, characterized in that a transmittance distribution layer surface to be irradiated as the more peripheral side transmittance is high.
　本発明によれば、発光ダイオードを用いたバックライト装置において、液晶表示パネルの中央部と対向するように直線状に複数個のレンズを配列して光源部を構成したことにより、十分な明るさを確保しながら簡単な構成で安価なバックライト装置および液晶表示装置を提供することができる。 According to the present invention, in the backlight device using the light emitting diode, the light source unit is configured by arranging a plurality of lenses in a straight line so as to face the central part of the liquid crystal display panel. It is possible to provide an inexpensive backlight device and liquid crystal display device with a simple configuration while ensuring the above.
図１は、本発明の一実施の形態によるバックライト装置を用いた液晶表示装置の全体の概略構成を示す分解斜視図である。FIG. 1 is an exploded perspective view showing an overall schematic configuration of a liquid crystal display device using a backlight device according to an embodiment of the present invention. 図２は、図１のＡ１－Ａ１線で切断した断面図である。2 is a cross-sectional view taken along line A1-A1 of FIG. 図３は、バックライト装置の光源部を示す平面図である。FIG. 3 is a plan view showing a light source unit of the backlight device. 図４は、図３のＡ２－Ａ２線で切断した断面図である。4 is a cross-sectional view taken along line A2-A2 of FIG. 図５は、本発明の一実施の形態によるバックライト装置において、光源部の基本構成を説明するための説明図である。FIG. 5 is an explanatory diagram for explaining a basic configuration of the light source unit in the backlight device according to the embodiment of the present invention. 図６は、レンズを配列方向の側面から見た断面図である。FIG. 6 is a cross-sectional view of the lens viewed from the side surface in the arrangement direction. 図７は、レンズの光路を説明するための説明図である。FIG. 7 is an explanatory diagram for explaining the optical path of the lens. 図８は、レンズの具体的な実施例を示す断面図である。FIG. 8 is a sectional view showing a specific example of the lens. 図９は、レンズの具体的な他の実施例を示す断面図である。FIG. 9 is a cross-sectional view showing another specific example of the lens. 図１０は、図８に示すレンズの配光特性を示す図である。FIG. 10 is a diagram showing the light distribution characteristics of the lens shown in FIG. 図１１は、図９に示すレンズの配光特性を示す図である。FIG. 11 is a diagram showing the light distribution characteristics of the lens shown in FIG. 図１２は、レンズの配列の一例を示す平面図である。FIG. 12 is a plan view illustrating an example of an arrangement of lenses. 図１３は、拡散板の一例を示す平面図である。FIG. 13 is a plan view showing an example of the diffusion plate. 図１４は、同じく拡散板の一例を示す平面図、Ｘ方向の断面図およびＹ方向の断面図である。FIG. 14 is a plan view showing an example of the diffusion plate, a cross-sectional view in the X direction, and a cross-sectional view in the Y direction.
　以下、本発明の一実施の形態によるバックライト装置およびそのバックライト装置を用いた液晶表示装置ついて、図面を参照しながら説明する。 Hereinafter, a backlight device and a liquid crystal display device using the backlight device according to an embodiment of the present invention will be described with reference to the drawings.
　図１は本発明の一実施の形態によるバックライト装置を用いた液晶表示装置の全体の概略構成を示す分解斜視図、図２は図１のＡ１－Ａ１線で切断した断面図である。 FIG. 1 is an exploded perspective view showing an overall schematic configuration of a liquid crystal display device using a backlight device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line A1-A1 of FIG.
　図１、図２に示すように、液晶表示装置は、長方形の平板形状で透過型の液晶表示パネル１と、この液晶表示パネル１の背面側に配置され、液晶表示パネル１に対応する大きさの直方体形状のバックライト装置２とにより構成されている。 As shown in FIGS. 1 and 2, the liquid crystal display device is a rectangular flat plate-shaped transmissive liquid crystal display panel 1 and is disposed on the back side of the liquid crystal display panel 1 and has a size corresponding to the liquid crystal display panel 1. And a rectangular parallelepiped backlight device 2.
　バックライト装置２は、液晶表示パネル１の長辺方向に沿って液晶表示パネル１の中央部と対向するように直線状に配置された光源部３と、この光源部３を収容する直方体形状の筐体４と、この筐体４の開口部６ａを覆うように配置されるとともに、前記液晶表示パネル１と光源部３との間に配置される拡散板５と、前記光源部３から出射した光を液晶表示パネル１側、すなわち拡散板５側に反射させる反射シート６とを備えている。 The backlight device 2 includes a light source unit 3 arranged in a straight line so as to face the central part of the liquid crystal display panel 1 along the long side direction of the liquid crystal display panel 1, and a rectangular parallelepiped shape that accommodates the light source unit 3. The casing 4 is disposed so as to cover the opening 6 a of the casing 4, and the diffuser plate 5 disposed between the liquid crystal display panel 1 and the light source unit 3, and the light source unit 3 emits light. A reflection sheet 6 that reflects light to the liquid crystal display panel 1 side, that is, the diffusion plate 5 side is provided.
　拡散板５は、液晶表示パネル１との間の前面側に、液晶表示パネル１に対応する大きさの光学シート積層体７を備えている。この光学シート積層体７は、例えば、拡散板５からの入射光を前方の液晶表示パネル１側に向けて集光させるプリズムシート、拡散板５からの入射光をさらに拡散させる拡散シート、入射光の偏光面が液晶表示パネル１の偏光面に対応するように特定の偏光面を有する光を透過させる偏光シート等により構成されている。 The diffusion plate 5 includes an optical sheet laminate 7 having a size corresponding to the liquid crystal display panel 1 on the front side between the diffusion plate 5 and the liquid crystal display panel 1. The optical sheet laminate 7 includes, for example, a prism sheet that condenses incident light from the diffusion plate 5 toward the front liquid crystal display panel 1, a diffusion sheet that further diffuses incident light from the diffusion plate 5, and incident light. The polarizing plane of the liquid crystal display panel 1 corresponds to the polarizing plane of the liquid crystal display panel 1 and is configured by a polarizing sheet or the like that transmits light having a specific polarizing plane.
　図３はバックライト装置の光源部を示す平面図、図４は図３のＡ２－Ａ２線で切断した断面図である。 FIG. 3 is a plan view showing a light source part of the backlight device, and FIG. 4 is a cross-sectional view taken along line A2-A2 of FIG.
　光源部３は、裏面側に所定の配線パターンを形成した短冊形状の絶縁性の基板８の表面上に、複数個の発光ダイオード９を所定の間隔で実装し、その個々の発光ダイオード９に対応させて、円柱を長軸方向に半分に切断したほぼ半円柱形状の複数個のレンズ１０を前記発光ダイオード９に被せるように配置することにより構成されている。なお、図示していないが、発光ダイオード９は、空気に触れないように、エポキシ樹脂またはシリコンゴム等の封止用の樹脂で覆われている。 The light source unit 3 mounts a plurality of light emitting diodes 9 at predetermined intervals on the surface of a strip-shaped insulating substrate 8 having a predetermined wiring pattern formed on the back side, and corresponds to each light emitting diode 9. Thus, a plurality of substantially semi-cylindrical lenses 10 obtained by cutting the cylinder in half in the major axis direction are arranged so as to cover the light emitting diode 9. Although not shown, the light emitting diode 9 is covered with a sealing resin such as an epoxy resin or silicon rubber so as not to come into contact with air.
　レンズ１０は、光源である発光ダイオード９からの光を拡張して被照射体に照射するもので、例えば１．４から２．０程度の屈折率を有する透明な材料で構成されている。レンズ１０を構成する透明材料としては、エポキシ樹脂、シリコン樹脂、アクリル樹脂、ポリカーボネイト等の樹脂、硝子、またはシリコンゴム等のゴムを用いることができる。中でも、発光ダイオードの封止用の樹脂として用いられるエポキシ樹脂またはシリコンゴム等を用いることが好ましい。 The lens 10 extends the light from the light emitting diode 9 as a light source and irradiates the irradiated object, and is made of a transparent material having a refractive index of about 1.4 to 2.0, for example. As a transparent material constituting the lens 10, epoxy resin, silicon resin, acrylic resin, polycarbonate or other resin, glass, or rubber such as silicon rubber can be used. Among them, it is preferable to use an epoxy resin or silicon rubber used as a resin for sealing a light emitting diode.
　ここで、図１～図４においては、前記光源部３は、複数個の発光ダイオード９とそれぞれに対応するように複数個のレンズ１０を一列に配列した状態の例を示しているが、複数個の発光ダイオード９と複数個のレンズ１０を二列、三列となるように複数列で配列することにより配置してもよく、また、複数列で配列する場合の配列形状も、隣り合う列間で千鳥状となるように配列してもよい。要は、液晶表示パネル１の中央部のみに対向するように直線状に配置されればよい。また、本実施の形態においては、光源部３が液晶表示パネル１の中央部に対向するように配置されることによりバックライト装置２のほぼ中央部のみに配置されることとなる。以下の図５から図１３の内容は、上記のように複数個の発光ダイオード９を一列に配列する場合にも複数列に配列する場合にも適用される。 Here, FIGS. 1 to 4 show an example in which the light source unit 3 has a plurality of lenses 10 arranged in a row so as to correspond to the light emitting diodes 9 respectively. The light emitting diodes 9 and the plurality of lenses 10 may be arranged in a plurality of rows so as to form two rows or three rows, and the arrangement shape in the case of arranging in a plurality of rows is also an adjacent row. You may arrange so that it may become a zigzag pattern between. In short, it may be arranged in a straight line so as to face only the central portion of the liquid crystal display panel 1. Further, in the present embodiment, the light source unit 3 is arranged so as to face the central part of the liquid crystal display panel 1, so that it is arranged only in the substantially central part of the backlight device 2. The following contents of FIGS. 5 to 13 are applied to the case where the plurality of light emitting diodes 9 are arranged in a single row as well as in the case of a plurality of rows as described above.
　次に、光源部３のレンズ１０の構成について、さらに詳細に説明する。 Next, the configuration of the lens 10 of the light source unit 3 will be described in more detail.
　図５は本発明の一実施の形態によるバックライト装置において、光源部３の基本構成を説明するための図である。図６はレンズを配列方向の側面から見た断面図である。 FIG. 5 is a diagram for explaining a basic configuration of the light source unit 3 in the backlight device according to the embodiment of the present invention. FIG. 6 is a cross-sectional view of the lens viewed from the side surface in the arrangement direction.
　まず、図５に示すように、光源である発光ダイオード９とレンズ１０とは、互いの光軸Ｚが合致するように配置されている。レンズ１０は、発光ダイオード９からの光を拡張して被照射面Ｇに照射するもので、被照射面Ｇの照度分布は、レンズ１０の設計上の中心線である光軸Ｚ上が最大で、周囲に行くほどほぼ単調に減少する。 First, as shown in FIG. 5, the light-emitting diode 9 and the lens 10 which are light sources are arranged so that their optical axes Z coincide with each other. The lens 10 extends the light from the light emitting diode 9 to irradiate the irradiated surface G, and the illuminance distribution of the irradiated surface G is maximum on the optical axis Z that is the design center line of the lens 10. It decreases almost monotonously as you go around.
　レンズ１０は、発光ダイオード９からの光が入射する入射面１１と、入射した光を出射させる出射面１２とを有している。また、レンズ１０は、入射面１１の周囲で出射面１２と反対側を向く底面１３を有している。さらに、出射面１２と底面１３との間には、外側に張り出す外縁部１４が設けられており、この外縁部１４の外面で出射面１２の周縁と底面１３とがつながれている。なお、外縁部１４は設けなくてもよく、出射面１２の周縁と底面１３とが直線状または円弧状の端面でつながれていてもよい。 The lens 10 has an incident surface 11 on which light from the light emitting diode 9 is incident, and an output surface 12 that emits the incident light. The lens 10 also has a bottom surface 13 that faces the light exit surface 12 around the entrance surface 11. Further, an outer edge portion 14 that protrudes outward is provided between the emission surface 12 and the bottom surface 13, and the periphery of the emission surface 12 and the bottom surface 13 are connected by the outer surface of the outer edge portion 14. The outer edge portion 14 may not be provided, and the periphery of the emission surface 12 and the bottom surface 13 may be connected by a linear or arcuate end surface.
　発光ダイオード９からの光は、入射面１１からレンズ１０内に入射した後、出射面１２から出射されて、被照射面Ｇに到達するもので、発光ダイオード９から放射される光は、入射面１１と出射面１２の作用で拡張され、被照射面Ｇの広い範囲に到達することとなる。 The light from the light emitting diode 9 enters the lens 10 from the incident surface 11 and is then emitted from the emission surface 12 to reach the irradiated surface G. The light emitted from the light emitting diode 9 is incident on the incident surface. 11 and the action of the exit surface 12, and reach a wide range of the illuminated surface G.
　また、図６に示すように、レンズ１０の入射面１１は、連続する凹面で、上面からの投影形状が光軸Ｚに対して楕円形である。また、入射面１１の周囲の底面１３は、平らな平面であるが、底面１３にピラミッド状の加工面や摺り状の加工面などを形成してもよい。 Further, as shown in FIG. 6, the incident surface 11 of the lens 10 is a continuous concave surface, and the projected shape from the upper surface is an ellipse with respect to the optical axis Z. Further, the bottom surface 13 around the incident surface 11 is a flat plane, but a pyramidal processed surface, a sliding processed surface, or the like may be formed on the bottom surface 13.
　レンズ１０の出射面１２は、上面および正面から見た投影形状が長方形などの四角形状で、レンズ１０の配列方向の側面から見た投影形状が連続する凸面部を有するほぼ円弧状の形状である。この出射面１２において、側面から見たときの中心部分の曲率は、実質的にゼロであることが好ましい。ここで、「中心部分」とは、光軸Ｚから所定半径、例えば、光軸方向から見たときの出射面１２の最外周の半径（有効径）の１／１０以内の領域をいい、「実質的にゼロ」とは、光軸Ｚ上の基点Ｑから出射面１２上の任意の点まで光軸方向に測った距離をサグ量（ｓａｇＹ）とした場合、前記中心部分における最大サグ量と最小サグ量の差が０．１ｍｍ以下のことをいう。このような形状であれば、成形がし易くなり、公差に強いレンズを作ることが可能となる。 The exit surface 12 of the lens 10 has a substantially arcuate shape having a convex surface portion in which the projection shape viewed from the upper surface and the front surface is a quadrangle such as a rectangle and the projection shape viewed from the side surface in the arrangement direction of the lenses 10 is continuous. . In the emission surface 12, it is preferable that the curvature of the central portion when viewed from the side surface is substantially zero. Here, the “center portion” refers to a region within a predetermined radius from the optical axis Z, for example, within 1/10 of the outermost radius (effective diameter) of the emission surface 12 when viewed from the optical axis direction. “Substantially zero” means that when the distance measured in the optical axis direction from the base point Q on the optical axis Z to any point on the exit surface 12 is the sag amount (sagY), The difference in the minimum sag amount is 0.1 mm or less. With such a shape, it becomes easy to mold and it is possible to make a lens that is resistant to tolerances.
　また、図６に示すように、レンズ１０の出射面１２は、光軸を含む断面における出射面１２０上の微小区間の曲率Ｃが、凸面部間であるｘ－ｙ間の中央Ｍよりも外側の位置で最大となるような形状に形成されている。図６において、θｉは、微小区間の位置を表しており、微小区間の中心と光軸Ｚ上の光源位置とを結んだ線Ｌｉと、光軸Ｚとのなす角度、すなわちθｉ≒（θｉ（ｎ＋１）＋θｉ（ｎ））／２である。 Further, as shown in FIG. 6, the exit surface 12 of the lens 10 has a curvature C of a minute section on the exit surface 120 in the cross section including the optical axis outside the center M between xy that is between the convex portions. It is formed in the shape which becomes the maximum at the position. In FIG. 6, θi represents the position of the minute section, and the angle between the line Li connecting the center of the minute section and the light source position on the optical axis Z and the optical axis Z, that is, θi≈ (θi ( n + 1) + θi (n)) / 2.
　すなわち、本発明におけるレンズ１０の出射面１２は、配列方向の側面から見た光軸を含む断面において、出射面１２上の微小区間の曲率Ｃは、６０°＜θｉ＜８０°で規定される範囲内において最大となるように構成されている。なお、より好ましくは、出射面１２上の微小区間の曲率Ｃは、６５°＜θｉ＜７５°で規定される範囲内において最大となるように構成すればよい。 That is, the exit surface 12 of the lens 10 according to the present invention has a cross section including the optical axis viewed from the side surface in the arrangement direction, and the curvature C of a minute section on the exit surface 12 is defined by 60 ° <θi <80 °. It is configured to be the maximum within the range. More preferably, the curvature C of the minute section on the emission surface 12 may be configured to be maximum within a range defined by 65 ° <θi <75 °.
　出射面１２上の微小区間の曲率Ｃが、６０°＜θｉ＜８０°で規定される範囲の上限を超えると、配光特性を確保するための公差が厳しくなり、面光源としたときに面内での輝度ムラが大きくなる。下限を超えると、配光特性が狭くなり、面光源としたときに面内での輝度ムラが大きくなる。 When the curvature C of the minute section on the emission surface 12 exceeds the upper limit of the range defined by 60 ° <θi <80 °, the tolerance for securing the light distribution characteristics becomes strict, and the surface when the surface light source is used. The brightness unevenness in the inside becomes large. When the lower limit is exceeded, the light distribution characteristics are narrowed, and in-plane luminance unevenness increases when a surface light source is used.
　ここで、微小区間の曲率Ｃについて、図６および図７の（ａ）、（ｂ）を用いて説明する。光軸上の光源位置を基準として、微小区間の曲率Ｃは次のように定義する。なお、「光軸上の光源位置」とは、光軸が光源の発光面と交わる位置である。 Here, the curvature C of the minute section will be described with reference to FIGS. 6 and 7A and 7B. With reference to the light source position on the optical axis, the curvature C of the minute section is defined as follows. The “light source position on the optical axis” is a position where the optical axis intersects the light emitting surface of the light source.
　図７の（ａ）、（ｂ）に示すように、出射面１２上の点Ａと点Ｂの間の、光軸からｎ番目の微小区間を考え、点Ａと光軸上の光源位置とを結んだ線と、光軸とのなす角度をθｉ（ｎ）とし、点Ｂと光軸上の光源位置とを結んだ線と、光軸とのなす角度をθｉ（ｎ＋１）とする。ただし、θｉ（ｎ＋１）－θｉ（ｎ）を０．１°程度とする。点Ａでの出射面１２の接線が光軸に垂直な面となす角度をθｓ（ｎ）とし、点Ｂでの出射面１２の接線が光軸に垂直な面となす角度をθｓ（ｎ＋１）とする。点Ａと点Ｂとの間の出射面１２０長さをΔｄ（ｎ）とする。点Ａと点Ｂの間の出射面１２は、点Ａと点Ｂの間隔が十分小さいとして、単一曲率半径Ｒで構成されるものとすると、Ｒの中心Ｏは点Ａでの出射面１２の法線と点Ｂでの出射面１２の法線が交差したところであり、２つの法線のなす角度∠ＡＯＢはθｓ（ｎ＋１）－θｓ（ｎ）で表せる。Ｏを中心とし、点Ａと点Ｂの間の円弧の半径ＲはΔｄ（ｎ）／（θｓ（ｎ＋１）－θｓ（ｎ））で表せる。曲率Ｃは１／Ｒである。よって、ｎ番目の微小区間の曲率Ｃは、（θｓ（ｎ＋１）－θｓ（ｎ））／Δｄ（ｎ）となる。ただし、θｓ（ｎ）およびθｓ（ｎ＋１）はラジアンで計算する。また、上記の定義では、曲率Ｃの符号は、曲率中心Ｏが出射面１２よりも光源側にあるときが正、その反対側にあるときが負となる。 As shown in FIGS. 7A and 7B, the nth minute section from the optical axis between point A and point B on the emission surface 12 is considered, and the light source position on point A and the optical axis The angle between the line connecting the optical axis and the optical axis is θi (n), and the angle between the line connecting point B and the light source position on the optical axis and the optical axis is θi (n + 1). However, θi (n + 1) −θi (n) is about 0.1 °. The angle formed by the tangent line of the exit surface 12 at point A and the plane perpendicular to the optical axis is θs (n), and the angle formed by the tangent line of the exit surface 12 at point B and the plane perpendicular to the optical axis is θs (n + 1). And The length of the emission surface 120 between point A and point B is assumed to be Δd (n). Assuming that the exit surface 12 between the points A and B has a single radius of curvature R, assuming that the distance between the points A and B is sufficiently small, the center O of R is the exit surface 12 at the point A. And the normal of the exit surface 12 at point B intersect, and the angle ∠AOB formed by the two normals can be expressed as θs (n + 1) −θs (n). The radius R of the arc between point A and point B centered on O can be expressed as Δd (n) / (θs (n + 1) −θs (n)). The curvature C is 1 / R. Therefore, the curvature C of the nth minute section is (θs (n + 1) −θs (n)) / Δd (n). However, θs (n) and θs (n + 1) are calculated in radians. In the above definition, the sign of the curvature C is positive when the center of curvature O is on the light source side with respect to the emission surface 12 and negative when it is on the opposite side.
　このような構成により、入射面１１から入射した光を出射面１２から広い範囲に出射するレンズ１０を実現することができる。 With such a configuration, it is possible to realize the lens 10 that emits light incident from the incident surface 11 in a wide range from the output surface 12.
　さらに、本発明におけるレンズ１０の出射面１２は、出射面１２上の任意の点と光軸Ｚ上の基点Ｑとを結んだ直線と光軸Ｚとの角度をθ、光軸Ｚ上の基点Ｑから前記出射面１２上の任意の点まで光軸方向に測った距離をｓａｇＹ、θが０°のときのｓａｇＹをｓａｇＹ０、としたときに、ｓａｇＹはｓａｇＹ０を最大として単調に減少し、出射面１２は、光軸Ｚの近傍を除き、出射面１２上の微小区間の曲率Ｃが最小となるときのθをθｍｉｎとするとき、θｍｉｎは、１０°＜θｍｉｎ＜３０°の範囲を満足することが好ましい。ここで、「光軸Ｚの近傍」とは、光軸Ｚから所定角度（例えば、θ＝２°）以内の領域をいう。 Further, the exit surface 12 of the lens 10 according to the present invention has an angle between a straight line connecting an arbitrary point on the exit surface 12 and a base point Q on the optical axis Z and the optical axis Z as θ, and a base point on the optical axis Z. sagY the distance measured along the optical axis from Q to an arbitrary point on the exit surface 12, when the θ is the sagY when the 0 ° sagY 0, and, sagY monotonously decreases the sagY 0 as the maximum The exit surface 12 is in the range of 10 ° <θmin <30 °, where θmin is θmin when the curvature C of the minute section on the exit surface 12 is minimum except in the vicinity of the optical axis Z. It is preferable to satisfy. Here, “in the vicinity of the optical axis Z” refers to a region within a predetermined angle (for example, θ = 2 °) from the optical axis Z.
　このように出射面１２の形状を規定することにより、発光ダイオード９のサイズが変化することによって同時に変動するフレネル反射成分が少なくなる。また、出射面１２上の微小区間の曲率Ｃが最小となるθｍｉｎが、１０°＜θｍｉｎ＜３０°の範囲の下限を超えると、上述のフレネル反射成分が発生し易くなり、上限を超えると、レンズ１０のサイズ、例えば光軸方向の長さが大きくなりすぎる。 By defining the shape of the emission surface 12 in this way, the Fresnel reflection component that fluctuates simultaneously as the size of the light emitting diode 9 changes is reduced. Further, if the θmin at which the curvature C of the minute section on the emission surface 12 is minimum exceeds the lower limit of the range of 10 ° <θmin <30 °, the above-described Fresnel reflection component is likely to occur, and if the upper limit is exceeded, The size of the lens 10, for example, the length in the optical axis direction becomes too large.
　図８～図１１にレンズ１０の具体的な実施例を示している。なお、汎用品の発光ダイオードを光源とし、指向性を広げることを目的とした例であり、発光ダイオードの発光面のサイズは、例えば、３．０×３．０ｍｍであり、１．０×１．０ｍｍであってもよく、３．０×１．０ｍｍであってもよい。 8 to 11 show specific examples of the lens 10. Note that this is an example in which a general-purpose light emitting diode is used as a light source and the directivity is expanded. The size of the light emitting surface of the light emitting diode is, for example, 3.0 × 3.0 mm, and 1.0 × 1. 0.0 mm or 3.0 × 1.0 mm may be used.
　図８および図９中のθは、光軸Ｚ上の基点Ｑと入射面１１および出射面１２上の任意の点とを結んだ直線と光軸Ｚとの角度である。さらに、図中のｓａｇＸは、光軸Ｚ上の基点Ｑから前記入射面１１上の任意の点まで光軸方向に測った距離であり、ｓａｇＹは、光軸Ｚ上の基点Ｑから前記出射面１２上の任意の点まで光軸方向に測った距離である。 8 and 9, θ is an angle between the optical axis Z and a straight line connecting the base point Q on the optical axis Z and arbitrary points on the incident surface 11 and the outgoing surface 12. Further, sagX in the figure is a distance measured in the optical axis direction from a base point Q on the optical axis Z to an arbitrary point on the incident surface 11, and sagY is the exit surface from the base point Q on the optical axis Z. 12 is a distance measured in the optical axis direction up to an arbitrary point on 12.
　図１０は、図８に示す実施例のレンズ１０について、θと、ｓａｇＸおよびｓａｇＹについてグラフ化したもので、ｓａｇＹはｓａｇＹ０を最大として単調に減少する形状であることを示している。 Figure 10 is a lens 10 of the embodiment shown in FIG. 8, and theta, a graph of the sagX and sagY, sagY shows that a shape monotonically decreasing the sagY 0 as the maximum.
　図１１は、図９に示す実施例のレンズ１０について、θと、ｓａｇＸおよびｓａｇＹについてグラフ化したもので、ｓａｇＹはｓａｇＹ０を最大として単調に減少する形状であることを示している。 11, the lens 10 of the embodiment shown in FIG. 9, and theta, a graph of the sagX and sagY, sagY shows that a shape monotonically decreasing the sagY 0 as the maximum.
　ところで、上記実施の形態においては、光源部３は、ほぼ半円柱形状の複数個のレンズ１０を配列して構成したが、液晶表示パネル１の長辺の長さに対応する長さの長尺のレンズ１０で構成してもよい。この構成の場合も、発光ダイオード９は複数個配置し、その発光ダイオード９に対応する入射面１１を複数個形成した構成とする。複数個の発光ダイオード９が複数列で配列される場合には、上記長尺のレンズ１０を発光ダイオードの列数に合わせて複数列設けてもよいし、複数個の発光ダイオード９が一列で配列される場合と同様に、１つの長尺のレンズを、複数個の発光ダイオード９の各々に対応する入射面１１を形成した構成として設けてもよい。 In the above embodiment, the light source unit 3 is configured by arranging a plurality of substantially semi-cylindrical lenses 10. However, the light source unit 3 has a long length corresponding to the length of the long side of the liquid crystal display panel 1. The lens 10 may be used. Also in this configuration, a plurality of light emitting diodes 9 are arranged, and a plurality of incident surfaces 11 corresponding to the light emitting diodes 9 are formed. When a plurality of light emitting diodes 9 are arranged in a plurality of rows, the long lenses 10 may be provided in a plurality of rows according to the number of light emitting diodes, or the plurality of light emitting diodes 9 are arranged in a row. Similarly to the case, one long lens may be provided as a configuration in which the incident surface 11 corresponding to each of the plurality of light emitting diodes 9 is formed.
　なお、長尺のレンズ１０で構成する場合に比べ、複数個のレンズ１０を配列して構成した場合は、レンズ１０を成形により作製する際の加工が容易で、安価に作製することができる。また、画面サイズの異なる液晶表示パネル１に対しても、液晶表示パネル１の長辺方向についてはレンズ１０の配列する個数などを調整するだけで対応可能であり、液晶表示装置としても安価に提供することが可能である。 In addition, compared with the case where it comprises with the elongate lens 10, when it comprises and arranges the several lens 10, the process at the time of producing the lens 10 by shaping | molding is easy, and it can produce at low cost. In addition, the liquid crystal display panel 1 having a different screen size can be dealt with by adjusting the number of the lenses 10 arranged in the long side direction of the liquid crystal display panel 1, and the liquid crystal display device can be provided at a low cost. Is possible.
　次に、光源部３の個々の光源の配列について説明する。 Next, the arrangement of the individual light sources in the light source unit 3 will be described.
　図３、図４に示すように、上記実施の形態においては、光源部３は、図５に示す構成のレンズ１０の配列方向の長さＬと、隣り合うレンズ１０間の間隔ｌとの関係がＬ＜ｌで、かつレンズ１０間の間隔ｌがほぼ均等となるように配列している。このような構成とすることにより、バックライト装置として十分な明るさを確保し、しかも少ない個数のレンズ１０で光源部３を構成することができ、安価に装置を構成することができる。 As shown in FIGS. 3 and 4, in the above embodiment, the light source unit 3 has a relationship between the length L in the arrangement direction of the lenses 10 having the configuration shown in FIG. 5 and the interval l between the adjacent lenses 10. Are arranged so that L <l and the distance l between the lenses 10 is substantially equal. With such a configuration, sufficient brightness as a backlight device can be ensured, and the light source unit 3 can be configured with a small number of lenses 10, and the device can be configured at low cost.
　ところで、図１、図２に示すように、液晶表示パネル１の中央部と対向するように一列に直線状に配置して光源部３を構成した場合、本発明者らが実験により確認したところでは、バックライト装置の端部において、拡散板５から出射される光が少なく、十分な明るさを確保しにくくなる。このような場合は、出力が大きい発光ダイオード９を使用すればよいが、価格が高くなってしまう。一方、液晶表示装置としては、画面の中央部が周辺部に比べてより明るいことが要求される。 By the way, as shown in FIGS. 1 and 2, when the light source unit 3 is configured in a straight line so as to face the central part of the liquid crystal display panel 1, the present inventors have confirmed through experiments. In the end portion of the backlight device, there is little light emitted from the diffusion plate 5, and it becomes difficult to ensure sufficient brightness. In such a case, the light emitting diode 9 having a large output may be used, but the price becomes high. On the other hand, the liquid crystal display device is required to have a brighter central portion of the screen than the peripheral portion.
　本発明においては、図１２に示すように、光源部３の個々の光源の配置間隔を変更することで、全体的に均一な明るさで発光する面光源とすることができ、また液晶表示装置の画面の明るさに対する要求も満足させることができる。 In the present invention, as shown in FIG. 12, by changing the arrangement interval of the individual light sources of the light source unit 3, it is possible to obtain a surface light source that emits light with uniform brightness as a whole, and a liquid crystal display device. The screen brightness requirement can be satisfied.
　すなわち、図１２に示すように、本発明の光源部３は、中央部３ａと周辺部３ｂにおける個々のレンズ１０の配置間隔を狭くして密に配置し、中央部３ａと周辺部３ｂの間の中間部３ｃにおける個々のレンズ１０の配置間隔については、前記中央部３ａおよび周辺部３ｂに比べて広くなるように配置している。また、中央部３ａと中間部３ｃとの境、および中間部３ｃと周辺部３ｂとの境については、徐々にレンズ１０の間隔が変化するように配置している。 That is, as shown in FIG. 12, in the light source unit 3 of the present invention, the arrangement intervals of the individual lenses 10 in the central part 3a and the peripheral part 3b are narrowly arranged closely, and between the central part 3a and the peripheral part 3b. The arrangement interval of the individual lenses 10 in the intermediate portion 3c is arranged so as to be wider than the central portion 3a and the peripheral portion 3b. Further, the boundary between the central part 3a and the intermediate part 3c and the boundary between the intermediate part 3c and the peripheral part 3b are arranged so that the distance between the lenses 10 gradually changes.
　さらに、本発明において、液晶表示パネル１の中央部と対向するように直線状に複数個のレンズ１０を配列して光源部３を構成することにより、画面サイズの異なる液晶表示パネル１に対しても、液晶表示パネル１の長辺方向についてはレンズ１０の配列する個数などを調整することで対応可能であるが、液晶表示パネル１の短辺方向を含めた画面全体の明るさについては、本発明者らが実験により確認した結果によると、レンズ１０の外形形状と、レンズ１０の配置間隔を所定の条件を満足するように構成することにより、十分に満足させることができることがわかった。 Furthermore, in the present invention, the light source unit 3 is configured by arranging a plurality of lenses 10 linearly so as to face the central part of the liquid crystal display panel 1, so that the liquid crystal display panel 1 having different screen sizes can be provided. However, the long side direction of the liquid crystal display panel 1 can be dealt with by adjusting the number of the lenses 10 arranged, but the brightness of the entire screen including the short side direction of the liquid crystal display panel 1 is According to the results confirmed by the inventors through experiments, it was found that the external shape of the lens 10 and the arrangement interval of the lenses 10 can be sufficiently satisfied by satisfying predetermined conditions.
　すなわち、本発明の光源部３において、レンズ１０の配列方向に直交するレンズ１０の短辺の長さをｄ１とし、レンズ１０の配置間隔ｌの最小間隔をｄ３とした場合、ｄ３＜（２×ｄ１）とすることにより、画面全体における明るさを十分に確保することができる。さらに、前記条件に加え、レンズ１０の配列方向の長辺の長さをｄ２とした場合、ｄ２＜（２×ｄ１）とするのがより好ましい。さらには、レンズ１０の光軸Ｚ上における厚みをｄ０とした場合、ｄ０＜（ｄ１／３）とする条件も組み合わせることが好ましい。 That is, in the light source unit 3 of the present invention, when the length of the short side of the lens 10 orthogonal to the arrangement direction of the lenses 10 is d1 and the minimum interval of the arrangement interval 1 of the lenses 10 is d3, d3 <(2 × By setting d1), it is possible to sufficiently ensure the brightness of the entire screen. Furthermore, in addition to the above conditions, when the length of the long side in the arrangement direction of the lenses 10 is d2, it is more preferable that d2 <(2 × d1). Furthermore, when the thickness of the lens 10 on the optical axis Z is d0, it is preferable to combine the conditions of d0 <(d1 / 3).
　次に、バックライト装置２の拡散板５の構成について、さらに詳細に説明する。 Next, the configuration of the diffusion plate 5 of the backlight device 2 will be described in more detail.
　バックライト装置２において、拡散板５は、光源部３側の裏面である被照射面Ｇに照射された光を表面側の面から拡散された状態で光を放射する。光源部３の個々の光源、すなわちレンズ１０からは拡散板５の被照射面Ｇに広い範囲で均一化された照度の光が照射され、この光が拡散板５で拡散されることにより、面内での輝度ムラが少ない面光源ができる。また、光源部３からの光は、拡散板５で散乱されて、光源部３側へ戻ったり、拡散板５を透過したりする。光源部３側へ戻って反射シート６に入射する光は、反射シート６で反射されて再度拡散板５に入射することとなる。 In the backlight device 2, the diffusion plate 5 emits light in a state where the light irradiated on the irradiated surface G that is the back surface on the light source unit 3 side is diffused from the surface on the front surface side. Each light source of the light source unit 3, that is, the lens 10 irradiates the irradiated surface G of the diffusing plate 5 with light having a uniform illuminance over a wide range, and the light is diffused by the diffusing plate 5, thereby A surface light source with less luminance unevenness can be obtained. Light from the light source unit 3 is scattered by the diffusion plate 5 and returns to the light source unit 3 side or passes through the diffusion plate 5. The light that returns to the light source unit 3 and enters the reflection sheet 6 is reflected by the reflection sheet 6 and enters the diffusion plate 5 again.
　このような拡散板５は、例えばアクリル樹脂などの板状体からなり、一方の面から入射した光を拡散させて他方の面から出射させるために、表面に凹凸形状を有し、微小な粒子を分散させた半透明な樹脂板により構成されている。 Such a diffusion plate 5 is made of, for example, a plate-like body such as an acrylic resin, and has a concavo-convex shape on the surface in order to diffuse light incident from one surface and emit the light from the other surface. It is comprised by the translucent resin board which disperse | distributed.
　また、図１３に示すように、拡散板５は、光源部３に対応する中央部側ほど透過率が低く、周辺部側ほど透過率が高くなるように、光源部３側の裏面である被照射面Ｇに透過率分布層５ａが設けられている。この透過率分布層５ａは、白色顔料を含有する白色インキなどからなる反射する部材によって形成され、前記反射パターンは中央部側ほど面積占有率が大きく、周辺部側ほど面積占有率が小さくなるように形成されている。白色インキは、透明バインダ内に酸化チタンなどの高屈折率透明材料からなる微粉末を分散したインキにより構成され、スクリーン印刷により所定のパターンの透過率分布層５ａが形成されている。 Further, as shown in FIG. 13, the diffusion plate 5 is a cover that is the back surface on the light source unit 3 side so that the transmittance is lower toward the center side corresponding to the light source unit 3 and higher toward the peripheral side. A transmittance distribution layer 5a is provided on the irradiation surface G. The transmittance distribution layer 5a is formed of a reflecting member made of white ink containing a white pigment, and the reflection pattern has a larger area occupancy at the center side and a smaller area occupancy at the periphery side. Is formed. The white ink is composed of ink in which fine powder made of a high refractive index transparent material such as titanium oxide is dispersed in a transparent binder, and a transmittance distribution layer 5a having a predetermined pattern is formed by screen printing.
　このような構成により、中央部からの光出射を抑制して、約５０ｍｍ程度の比較的薄い構造で前記適切な輝度分布を実現することができる。 With such a configuration, the appropriate luminance distribution can be realized with a relatively thin structure of about 50 mm while suppressing light emission from the central portion.
　また、この拡散板５としては、図１４の（ａ）、（ｂ）、（ｃ）に示すように、光源部３側の裏面である被照射面Ｇにシリンドリカルレンズ部５ｂを形成してもよい。 Further, as the diffusion plate 5, as shown in FIGS. 14A, 14 </ b> B, and 14 </ b> C, a cylindrical lens portion 5 b is formed on the irradiated surface G that is the back surface on the light source portion 3 side. Good.
　すなわち、拡散板５の水平方向をＸ、垂直方向をＹとすると、Ｘ方向およびＹ方向にアナモフィック曲面などの曲率を持ち、拡散板５の四隅の厚みが薄くなるように成形することにより、拡散板５の光源部３側の裏面である被照射面Ｇに、シリンドリカルレンズ部５ｂを形成している。 That is, when the horizontal direction of the diffusion plate 5 is X and the vertical direction is Y, the diffusion plate 5 has a curvature such as an anamorphic curved surface in the X direction and the Y direction, and the diffusion plate 5 is formed so that the thickness of the four corners is reduced. A cylindrical lens portion 5b is formed on the irradiated surface G which is the back surface of the plate 5 on the light source portion 3 side.
　本発明による具体的な実施例として、アナモフィック曲面によるシリンドリカルレンズ部５ｂを形成した本発明による拡散板５と、曲面を形成していない比較例の拡散板５とを作製し、それぞれの拡散板５を図１、図２に示すように配置し、それぞれの輝度を求め、中心値に対する輝度分布を測定したところ、本発明による拡散板５は、比較例のものと比較して、四隅の値が約５％程度向上することがわかった。 As specific examples according to the present invention, the diffusion plate 5 according to the present invention in which the cylindrical lens portion 5b having an anamorphic curved surface is formed and the diffusion plate 5 of the comparative example in which no curved surface is formed are manufactured. 1 and FIG. 2, the respective luminances were obtained, and the luminance distribution with respect to the center value was measured. As a result, the diffusion plate 5 according to the present invention has four corner values as compared with the comparative example. It was found that the improvement was about 5%.
　このように拡散板５の光源部３側の裏面である被照射面Ｇに、所定の配光特性を有するシリンドリカルレンズ部５ｂを形成することにより、所望の輝度分布を持つバックライト装置を実現することができる。なお、拡散板５の曲面形状をアナモフィック曲面で形成したが、他の自由曲面で構成してもよい。なお、上記曲面形状のシリンドリカルレンズと平板状部材とを貼り合せて拡散板５を構成してもよい。 In this way, by forming the cylindrical lens portion 5b having a predetermined light distribution characteristic on the irradiated surface G that is the back surface of the diffusion plate 5 on the light source portion 3 side, a backlight device having a desired luminance distribution is realized. be able to. In addition, although the curved surface shape of the diffusion plate 5 is formed with an anamorphic curved surface, it may be configured with other free curved surfaces. Note that the diffusing plate 5 may be configured by bonding the curved cylindrical lens and a flat plate member.
　次に、バックライト装置２の反射シート６の構成について、さらに詳細に説明する。 Next, the configuration of the reflection sheet 6 of the backlight device 2 will be described in more detail.
　図１、図２に示すように、反射シ－ト６は、光源部３を中心にして、バックライト装置２の長辺側端部に向かって湾曲したほぼ円筒面状の形状を有し、光源部３の個々のレンズ１０に対応する部分に開口部６ａを設けた構成である。 As shown in FIGS. 1 and 2, the reflection sheet 6 has a substantially cylindrical surface shape that is curved toward the long side end of the backlight device 2 with the light source unit 3 as the center. In this configuration, openings 6 a are provided at portions corresponding to the individual lenses 10 of the light source unit 3.
　本発明においては、反射シート６の中央部、すなわち光源部３の発光ダイオード９の発光面と、反射シート６の湾曲した先端部、すなわちバックライト装置２の長辺側端部とを結ぶ線が、光源部３のレンズ１０の光軸Ｚに対して、６０°≦θｍ≦８０°の範囲内の角度となるように構成されている。 In the present invention, a line connecting the central portion of the reflection sheet 6, that is, the light emitting surface of the light emitting diode 9 of the light source unit 3, and the curved tip portion of the reflection sheet 6, that is, the long side end portion of the backlight device 2. The angle is within the range of 60 ° ≦ θm ≦ 80 ° with respect to the optical axis Z of the lens 10 of the light source unit 3.
　すなわち、本発明者らが実験した結果に基づき、検討した結果、図１、図２に示すように、液晶表示パネル１の中央部と対向するように、直線状に複数個のレンズ１０を配列して光源部３を構成したバックライト装置において、反射シート６の中央部と、反射シート６の湾曲した先端部とを結ぶ線が、光源部３のレンズ１０の光軸Ｚに対して、６０°≦θｍ≦８０°の範囲内の角度となるように構成することにより、輝度ムラが少なく、しかも十分な明るさを持つ面光源とすることができる。 That is, as a result of examination based on the results of experiments conducted by the present inventors, a plurality of lenses 10 are arranged linearly so as to face the central portion of the liquid crystal display panel 1 as shown in FIGS. In the backlight device that constitutes the light source unit 3, the line connecting the central portion of the reflection sheet 6 and the curved tip portion of the reflection sheet 6 is 60 with respect to the optical axis Z of the lens 10 of the light source unit 3. By configuring the angle to be within the range of ° ≦ θm ≦ 80 °, a surface light source with little brightness unevenness and sufficient brightness can be obtained.
　なお、上記実施の形態においては、反射シート６の形状が、光源部３を中心にして、バックライト装置２の長辺側端部に向かって湾曲した形状としたが、湾曲した形状でなく、直線状の形状であってもよい。 In the above-described embodiment, the shape of the reflection sheet 6 is curved toward the long side end of the backlight device 2 with the light source unit 3 as the center, but is not a curved shape. A linear shape may be sufficient.
　以上説明したように本発明によれば、発光ダイオードを用いたバックライト装置において、液晶表示パネルの中央部と対向するように直線状に複数個のレンズを配列して光源部を構成したことにより、十分な明るさを確保しながら簡単な構成で安価なバックライト装置および液晶表示装置を提供することができる。 As described above, according to the present invention, in the backlight device using the light emitting diode, the light source unit is configured by arranging a plurality of lenses in a straight line so as to face the central part of the liquid crystal display panel. Thus, it is possible to provide an inexpensive backlight device and liquid crystal display device with a simple configuration while ensuring sufficient brightness.
　以上のように本発明によれば、十分な明るさを確保しながら簡単な構成で安価なバックライト装置および液晶表示装置を得る上で有用な発明である。 As described above, according to the present invention, the invention is useful for obtaining an inexpensive backlight device and liquid crystal display device with a simple configuration while ensuring sufficient brightness.
　１　　液晶表示パネル
　２　　バックライト装置
　３　　光源部
　４　　筐体
　５　　拡散板
　６　　反射シート
　７　　光学シート積層体
　８　　基板
　９　　発光ダイオード
　１０　　レンズ
　１１　　入射面
　１２　　出射面
　１３　　底面
　１４　　外縁部 DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 2 Backlight apparatus 3 Light source part 4 Case 5 Diffuser plate 6 Reflective sheet 7 Optical sheet laminated body 8 Board | substrate 9 Light emitting diode 10 Lens 11 Incident surface 12 Output surface 13 Bottom surface 14 Outer edge part

Claims (8)

  1. 　複数個の発光ダイオードおよびこの発光ダイオードからの光を拡張するレンズからなる光源部と、この光源部を収容する筐体と、この筐体の開口部を覆うように配置される拡散板と、前記光源部から出射した光を前記拡散板側に反射させる反射シートとを備えたバックライト装置であって、
    　前記光源部の前記複数個の発光ダイオードは、中央部に一列または複数列に配列されており、
    　前記レンズは、発光ダイオードからの光が入射する入射面と、入射した光を拡張して出射する出射面とを有し、
    　前記拡散板は、被照射面にシリンドリカルレンズ部を形成したことを特徴とするバックライト装置。     A plurality of light emitting diodes and a light source unit comprising a lens for expanding light from the light emitting diodes, a housing for housing the light source unit, a diffusion plate disposed so as to cover an opening of the housing, A backlight device including a reflection sheet that reflects light emitted from the light source unit toward the diffusion plate,
    The plurality of light emitting diodes of the light source unit are arranged in a row or a plurality of rows in a central portion,
    The lens has an incident surface on which light from the light emitting diode is incident, and an exit surface that expands and emits the incident light.
    The diffuser plate has a cylindrical lens portion formed on a surface to be irradiated.
  2. 　複数個の発光ダイオードおよびこの発光ダイオードからの光を拡張するレンズからなる光源部と、この光源部を収容する筐体と、この筐体の開口部を覆うように配置される拡散板と、前記光源部から出射した光を前記拡散板側に反射させる反射シートとを備えたバックライト装置であって、
    　前記光源部の前記複数個の発光ダイオードは、中央部に一列または複数列に配列されており、
    　前記レンズは、発光ダイオードからの光が入射する入射面と、入射した光を拡張して出射する出射面とを有し、
    　前記拡散板は、前記光源部に対応する中央部側ほど透過率が低く、周辺部側ほど透過率が高くなるように被照射面に透過率分布層を設けたことを特徴とするバックライト装置。     A plurality of light emitting diodes and a light source unit comprising a lens for expanding light from the light emitting diodes, a housing for housing the light source unit, a diffusion plate disposed so as to cover an opening of the housing, A backlight device including a reflection sheet that reflects light emitted from the light source unit toward the diffusion plate,
    The plurality of light emitting diodes of the light source unit are arranged in a row or a plurality of rows in a central portion,
    The lens has an incident surface on which light from the light emitting diode is incident, and an exit surface that expands and emits the incident light.
    The backlight device is characterized in that the diffuser plate is provided with a transmittance distribution layer on the irradiated surface so that the transmittance is lower at the center side corresponding to the light source portion and the transmittance is higher at the peripheral side. .
  3. 　前記透過率分布層は、反射する部材によって形成され、中央部側ほど面積占有率が大きく周辺部側ほど面積占有率が小さくなるように形成された反射パターンを備えていることを特徴とする請求項２に記載のバックライト装置。 The transmittance distribution layer is formed of a reflecting member, and includes a reflection pattern formed such that the area occupancy is larger toward the center side and the area occupancy is smaller toward the peripheral side. Item 3. The backlight device according to Item 2.
  4. 　前記出射面は上面および正面から見た投影形状が四角形状で、レンズの配列方向の側面から見た投影形状がほぼ円弧形状であることを特徴とする請求項１から３までのいずれか１項に記載のバックライト装置。 4. The projection surface as viewed from the upper surface and the front surface is a quadrangular shape, and the projection shape as viewed from the side surface in the lens arrangement direction is a substantially arc shape. The backlight device described in 1.
  5. 　液晶表示パネルと、この液晶表示パネルの背面側に配置され、液晶表示パネルに対応する大きさのバックライト装置とからなり、前記バックライト装置は、複数個の発光ダイオードおよびこの発光ダイオードからの光を拡張するレンズからなる光源部と、この光源部を収容する筐体と、この筐体の開口部を覆うように配置される拡散板と、前記光源部から出射した光を前記拡散板側に反射させる反射シートとを備えた液晶表示装置であって、
    　前記光源部の前記複数個の発光ダイオードは、中央部に一列または複数列に配列されており、
    　前記レンズは、発光ダイオードからの光が入射する入射面と、入射した光を拡張して出射する出射面とを有し、
    　前記拡散板は、被照射面にシリンドリカルレンズ部を形成したことを特徴とする液晶表示装置。     A liquid crystal display panel and a backlight device arranged on the back side of the liquid crystal display panel and having a size corresponding to the liquid crystal display panel. The backlight device includes a plurality of light emitting diodes and light from the light emitting diodes. A light source unit composed of a lens for extending the light source, a housing for housing the light source unit, a diffusion plate arranged to cover the opening of the housing, and light emitted from the light source unit to the diffusion plate side A liquid crystal display device comprising a reflective sheet for reflecting,
    The plurality of light emitting diodes of the light source unit are arranged in a row or a plurality of rows in a central portion,
    The lens has an incident surface on which light from the light emitting diode is incident, and an exit surface that expands and emits the incident light.
    A liquid crystal display device, wherein the diffusion plate has a cylindrical lens portion formed on an irradiated surface.
  6. 　液晶表示パネルと、この液晶表示パネルの背面側に配置され、液晶表示パネルに対応する大きさのバックライト装置とからなり、前記バックライト装置は、複数個の発光ダイオードおよびこの発光ダイオードからの光を拡張するレンズからなる光源部と、この光源部を収容する筐体と、この筐体の開口部を覆うように配置される拡散板と、前記光源部から出射した光を前記拡散板側に反射させる反射シートとを備えた液晶表示装置であって、
    　前記光源部の前記複数個の発光ダイオードは、中央部に一列または複数列に配列されており、
    　前記レンズは、発光ダイオードからの光が入射する入射面と、入射した光を拡張して出射する出射面とを有し、
    　前記拡散板は、前記光源部に対応する中央部側ほど透過率が低く、周辺部側ほど透過率が高くなるように被照射面に透過率分布層を設けたことを特徴とする液晶表示装置。     A liquid crystal display panel and a backlight device arranged on the back side of the liquid crystal display panel and having a size corresponding to the liquid crystal display panel. The backlight device includes a plurality of light emitting diodes and light from the light emitting diodes. A light source unit composed of a lens for extending the light source, a housing for housing the light source unit, a diffusion plate arranged to cover the opening of the housing, and light emitted from the light source unit to the diffusion plate side A liquid crystal display device comprising a reflective sheet for reflecting,
    The plurality of light emitting diodes of the light source unit are arranged in a row or a plurality of rows in a central portion,
    The lens has an incident surface on which light from the light emitting diode is incident, and an exit surface that expands and emits the incident light.
    The liquid crystal display device is characterized in that the diffuser plate is provided with a transmittance distribution layer on the irradiated surface so that the transmittance is lower toward the central portion corresponding to the light source portion, and the transmittance is higher toward the peripheral portion side. .
  7. 　前記透過率分布層は、反射する部材によって形成され、中央部側ほどで面積占有率が大きく周辺部側ほどで面積占有率が小さくなるように形成された反射パターンを備えていることを特徴とする請求項６に記載の液晶表示装置。 The transmittance distribution layer is formed of a reflecting member, and includes a reflection pattern formed so that the area occupancy is larger toward the center side and the area occupancy is smaller toward the periphery side. The liquid crystal display device according to claim 6.
  8. 　前記出射面は上面および正面から見た投影形状が四角形状で、レンズの配列方向の側面から見た投影形状がほぼ円弧形状であることを特徴とする請求項５から７までのいずれか１項に記載の液晶表示装置。 8. The projection surface according to claim 5, wherein the emission surface has a quadrangular projection shape when viewed from the upper surface and the front surface, and has a substantially arc shape when viewed from the side surface in the lens arrangement direction. A liquid crystal display device according to 1.
PCT/JP2011/006747 2010-12-16 2011-12-01 Backlight device and liquid-crystal display device WO2012081183A1 (en)

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