WO2012081184A1 - バックライト装置および液晶表示装置ならびにレンズ - Google Patents
バックライト装置および液晶表示装置ならびにレンズ Download PDFInfo
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- WO2012081184A1 WO2012081184A1 PCT/JP2011/006748 JP2011006748W WO2012081184A1 WO 2012081184 A1 WO2012081184 A1 WO 2012081184A1 JP 2011006748 W JP2011006748 W JP 2011006748W WO 2012081184 A1 WO2012081184 A1 WO 2012081184A1
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- optical axis
- light
- lens
- light source
- exit surface
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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
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- 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
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- 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
- 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
- G02B19/0071—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source adapted to illuminate a complete hemisphere or a plane extending 360 degrees around the source
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
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- 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 using a light emitting diode as a light source, a liquid crystal display device, and a lens.
- 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 situation, and provides a backlight device, a liquid crystal display device, and a lens with a simple configuration while ensuring sufficient brightness in a backlight device using a light emitting diode. For the purpose.
- 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 arranged 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 curvature C of the minute section on the exit surface connects the center of the minute section and the position of the light source on the optical axis.
- a light line and the light Angle between is characterized by being configured such that the maximum within the range defined by 60 ° ⁇ i ⁇ 80 °.
- 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 exit surface of the lens includes an optical axis viewed from a side surface in the arrangement direction.
- the angle C between the optical axis and the line C connecting the center of the minute section and the position of the light source on the optical axis is 60 ° ⁇ i ⁇ 80 °. It is characterized in that it is configured to be the maximum within the range specified in.
- the lens of the present invention is a lens for use in a backlight device having a light source unit composed of a plurality of light emitting diodes and a lens for expanding light from the light emitting diodes.
- the light-emitting diodes are arranged in one or more rows in the center, and the lens has an incident surface on which light from the light-emitting diodes is incident and an emission surface that expands and emits the incident light,
- the exit surface In the cross section including the optical axis viewed from the side surface in the arrangement direction, the exit surface has a curvature C of the minute section on the exit surface that connects the center of the minute section and the position of the light source on the optical axis.
- the angle between the optical axis and the optical axis is maximized within a range defined by 60 ° ⁇ i ⁇ 80 °.
- 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.
- 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.
- 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 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 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.
- 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.
- 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 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 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
Description
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
Claims (12)
- 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、
前記レンズの出射面は、配列方向の側面から見た光軸を含む断面において、出射面上の微小区間の曲率Cが、前記微小区間の中心と前記光軸上の光源の位置とを結んだ線と、前記光軸とのなす角度が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したことを特徴とするバックライト装置。 - 前記レンズの出射面は、出射面上の任意の点と前記光軸上の光源の位置とを結んだ直線と前記光軸との角度をθ、前記光軸上の光源の位置から出射面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、出射面は、前記光軸から所定角度以内の領域を除き、出射面上の前記微小区間の曲率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を特徴とする請求項1に記載のバックライト装置。
- 前記レンズの前記出射面において、側面から見たときの前記光軸から所定半径以内の領域の曲率は、前記光軸上の光源の位置から前記出射面上の任意の点まで光軸方向に測った距離をサグ量とした場合、前記所定半径以内の領域における最大サグ量と最小サグ量の差が0.1mm以下であることを特徴とする請求項1または2に記載のバックライト装置。
- 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。
- 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、
前記レンズの出射面は、配列方向の側面から見た光軸を含む断面において、出射面上の微小区間の曲率Cが、前記微小区間の中心と前記光軸上の光源の位置とを結んだ線と、前記光軸とのなす角度が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したことを特徴する液晶表示装置。 - 前記レンズの出射面は、出射面上の任意の点と前記光軸上の光源の位置とを結んだ直線と前記光軸との角度をθ、前記光軸上の光源の位置から出射面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、出射面は、前記光軸から所定角度以内の領域を除き、出射面上の前記微小区間の曲率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を特徴とする請求項5に記載の液晶表示装置。
- 前記レンズの前記出射面において、側面から見たときの前記光軸から所定半径以内の領域の曲率は、前記光軸上の光源の位置から前記出射面上の任意の点まで光軸方向に測った距離をサグ量とした場合、前記所定半径以内の領域における最大サグ量と最小サグ量の差が0.1mm以下であることを特徴とする請求項5または6に記載の液晶表示装置。
- 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。
- 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を有する、バックライト装置に使用されるレンズであって、
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、
前記出射面は、配列方向の側面から見た光軸を含む断面において、出射面上の微小区間の曲率Cが、前記微小区間の中心と前記光軸上の光源の位置とを結んだ線と、前記光軸とのなす角度が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したことを特徴とするレンズ。 - 前記レンズの出射面は、出射面上の任意の点と前記光軸上の光源の位置とを結んだ直線と前記光軸との角度をθ、前記光軸上の光源の位置から出射面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、出射面は、前記光軸から所定角度以内の領域を除き、出射面上の前記微小区間の曲率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を特徴とする請求項9に記載のレンズ。
- 前記レンズの前記出射面において、側面から見たときの前記光軸から所定半径以内の領域の曲率は、前記光軸上の光源の位置から前記出射面上の任意の点まで光軸方向に測った距離をサグ量とした場合、前記所定半径以内の領域における最大サグ量と最小サグ量の差が0.1mm以下であることを特徴とする請求項9または10に記載のレンズ。
- 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9から11までのいずれか1項に記載のレンズ。
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CN108518601A (zh) * | 2018-03-23 | 2018-09-11 | 苏州欧普照明有限公司 | 一种照明装置及调节方法、台灯 |
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