WO2012043315A1

WO2012043315A1 - Lighting apparatus, display apparatus, and television receiver apparatus

Info

Publication number: WO2012043315A1
Application number: PCT/JP2011/071422
Authority: WO
Inventors: 張　志芳
Original assignee: シャープ株式会社
Priority date: 2010-09-28
Filing date: 2011-09-21
Publication date: 2012-04-05

Abstract

Provided is a lighting apparatus, a display apparatus, and a television receiver apparatus, wherein light from light sources can be made to enter a light guiding plate efficiently even when the light guiding plate is made to be thin. A lighting apparatus of the present invention (20) comprises a light guiding plate (22), and light sources (23) arranged along end faces (22A) of the light guiding plate (22). First reflection sections (34) for reflecting light from the light sources (23), and second reflection sections (35) for reflecting reflection light from the first reflection sections (34) are formed between the light sources (23) and the end faces (22A). The first reflection sections (34) are formed at positions where light coming from the light sources (23) and going towards the outside of the end faces (22A) can be reflected towards the second reflection sections (35), and the second reflection sections (35) are concave mirrors configured such that the focal points thereof are located at the end faces (22A).

Description

Lighting device, display device, and television receiver

The present invention relates to a lighting device, a display device, and a television receiver.

As an example of an illuminating device, a so-called edge light type device is known in which a light source is arranged along an end surface of a light guide plate, and light from the light source is emitted into a planar light by the light guide plate (for example, patent document). 1). This type of lighting device has the advantage that it is easy to reduce the thickness and weight.

JP 2007-335312 A

(Problems to be solved by the invention)
By the way, in the above illuminating device, in order to further reduce the thickness and weight, the light guide plate is being made thinner. However, when the light guide plate is thinned, the end face thereof becomes small, so that it becomes difficult for light from the light source to enter the light guide plate without loss.
For example, when this type of illumination device is used for a display device of a liquid crystal television, it is required to emit uniform light to the display panel, so that the light from the light source is efficiently incident on the light guide plate. is important. In particular, in order to deal with an increase in the size of the display device, in order to emit uniform light from the entire large light guide plate, a decrease in light incident efficiency on the light guide plate is not preferable, and the light guide plate should be made thinner. Was difficult.

The present invention has been completed based on the above circumstances, and an illumination device, a display device, and a television receiver capable of efficiently making light from a light source incident on the light guide plate even if the light guide plate is thinned. An object is to provide an apparatus.

(Means for solving problems)
The illuminating device of the present invention is an illuminating device including a light guide plate and a light source disposed along an end surface of the light guide plate, and the light from the light source is interposed between the light source and the end surface. A first reflecting part for reflecting and a second reflecting part for reflecting the reflected light from the first reflecting part are provided, and the first reflecting part transmits light from the light source toward the outside of the end face to the second reflecting part. The second reflecting portion is a concave mirror that is provided at a position where it can be reflected toward the reflecting portion, and whose focal point is set on the end surface.

According to such a configuration, the light emitted from the light source toward the outside of the end surface is reflected by the first reflecting portion and the second reflecting portion and travels toward the end surface (focal point) of the light guide plate. Regardless of the thickness of the light guide, that is, even if the light guide plate is made thin, the light from the light source can be efficiently incident on the light guide plate.

The first reflecting unit and the second reflecting unit are elliptical mirrors having two focal points, and the first focal point of the first reflecting unit is set to be located on a light emitting surface of the light source, The first focal point of the second reflecting part is set to be located on the end face, and the second focal point of the first reflecting part and the second focal point of the second reflecting part are set to be at the same position. It is good as it is.

According to such a configuration, the light that has passed through the light emitting surface of the light source (the first focal point of the first reflecting unit) and reflected by the first reflecting unit is the second focal point (of the second reflecting surface) of the first reflecting unit. The light reflected by the second reflecting portion through the focal point is directed to the end surface of the light guide plate (first focus of the second reflecting portion), so that the light incident efficiency on the light guide plate is increased. Can be increased.

In addition, the first focal point of the second reflecting portion may be set so as to be positioned at the approximate center in the front and back direction of the light guide plate in the end surface.
The light source may be an LED substrate formed by mounting an LED on a printed circuit board, and the light emitting surface of the LED may be disposed to face the end surface.
The light source is an LED substrate formed by mounting an LED on a printed circuit board, and the light emitting surface of the LED is arranged to face the end surface, and the first focal point of the first reflecting portion is It is good also as what is set so that it may be located in the approximate center of a light emission surface.

The LED may be a rectangular parallelepiped having a light emitting surface that is flat.
Further, the light guide plate and the light source are arranged such that one of the front and back surfaces of the light guide plate and a substantially center position of the light emitting surface of the light source substantially coincide with the front and back directions of the light guide plate. It is good also as what is done.

Further, a reflector surrounding the light source may be provided, and the first reflecting portion and the second reflecting portion may be provided in the reflector.
Moreover, it is an illuminating device which irradiates light with respect to a display panel, Comprising: The said reflector may have a light emission part which covers the said display panel side of the said light source. According to such a configuration, unnecessary light leakage to the display surface can be suppressed.

Further, the light source may be an LED substrate in which an LED is mounted on a printed board, and the reflector may be made of metal and have a heat transfer portion along the plate surface of the printed board. According to such a configuration, the heat generated from the LED is transmitted to the reflector through the printed board and is dissipated. Therefore, the dissipating area is increased by the amount of the reflector, so that the heat dissipation can be improved.

Further, the reflector may be made of aluminum or aluminum alloy. According to such a structure, since the heat conductivity of a reflector is good, heat dissipation can be improved.
Further, a reflection sheet may be provided on the front side or the back side of the light guide plate. According to such a configuration, the light incident on the light guide plate can be efficiently emitted.

The display device of the present invention includes the illumination device and a display panel that performs display using light from the illumination device.
The display panel may be a liquid crystal panel using liquid crystal.
The television receiver of the present invention includes the display device.

(The invention's effect)
According to the present invention, it is possible to provide an illuminating device, a display device, and a television receiver capable of efficiently making light from a light source incident on a light guide plate even if the light guide plate is thinned.

1 is an exploded perspective view showing a schematic configuration of a television receiver according to the present embodiment. Exploded perspective view showing schematic configuration of liquid crystal display device Sectional drawing which shows the cross-sectional structure along the short side direction of a liquid crystal display device External perspective view showing a schematic configuration of a reflector surrounding an LED substrate Partially enlarged sectional view of the liquid crystal display device schematically showing the path of light reflected by the first reflecting portion and the second reflecting portion and entering the light incident surface of the LED light Partially enlarged sectional view of a liquid crystal display device schematically showing a path of light directly incident on a light incident surface of LED light

<Embodiment>
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In the present embodiment, a television receiver TV including the liquid crystal display device (display device) 10 is illustrated. As shown in FIG. 1, the television receiver TV includes a liquid crystal display device 10, cabinets Ca and Cb that accommodate the liquid crystal display device 10 sandwiched from the front and back, a power source P, a tuner T for receiving television broadcasts, and the like. And a stand S. The liquid crystal display device 10 is accommodated in the cabinets Ca and Cb in a vertically placed posture with the display surface 11A directed in a substantially vertical direction. Hereinafter, in each component, the lower left side (front side of the television receiver TV, the display surface 11A side) in FIG. 1 will be described as the front side, the upper right side as the back side, the upper side as the upper side, and the lower side as the lower side. In the drawing, the front side is shown as the Z-axis positive direction, the upper side is shown as the Y-axis positive direction, and the right side toward the television receiver TV is shown as the X-axis positive direction.

The liquid crystal display device 10 has a horizontally long rectangular shape as a whole, and is a liquid crystal panel (display panel) 11 capable of displaying an image and an external light source that emits light toward the liquid crystal panel 11 as shown in FIG. A backlight device (illumination device) 20 is provided, and these are integrally held by a bezel 12 or the like.

The liquid crystal panel 11 includes a pair of transparent (translucent) glass substrates having a horizontally long rectangular shape, and a liquid crystal layer that is interposed between both substrates and whose optical characteristics change with voltage application. Have. One of the two substrates is provided with a switching element (for example, TFT) connected to a source wiring and a gate wiring orthogonal to each other, a pixel electrode connected to the switching element, and the like on the other substrate. Are provided with a counter electrode and a color filter in which colored portions such as R, G, and B are arranged in a predetermined arrangement. The peripheral edge of the liquid crystal panel 11 is held between the bezel 12 and a frame 21 described later (see FIG. 3). A driver board 13 for controlling the driving of the liquid crystal panel 11 is disposed around the liquid crystal panel 11, and the driver board 13 and the liquid crystal panel 11 are connected via a plurality of flexible boards 14.

The backlight device 20 arranges an LED substrate 23 (light source) along an end surface (referred to as a light incident surface 22 A) of the light guide plate 22, and converts the light of the LED substrate 23 into planar light by the light guide plate 22. In this case, a so-called edge light system (side light system) that emits light toward the liquid crystal panel 11 is used.

The backlight device 20 includes a substantially box-shaped chassis 26 opened on the front side (light emitting side, liquid crystal panel 11 side), and a frame 21 arranged along the periphery of the chassis 26. A light guide plate 22 and an LED substrate 23 are accommodated in the chassis 26.

The chassis 26 is made of a metal such as an aluminum-based material, for example, and includes a bottom plate 26A having a rectangular shape in plan view and a side plate 26B rising from the periphery of the bottom plate 26A to the front side (see FIG. 2). Like the chassis 26, the frame 21 is made of metal and has a frame shape along the periphery of the chassis 26.

The light guide plate 22 is made of a resin having high translucency (high transparency) such as acrylic, and is formed in a plate shape whose thickness dimension is substantially constant over the whole. The light guide plate 22 has a substantially rectangular shape in plan view, and is disposed to face the liquid crystal panel 11.

In the light guide plate 22, light incident from the light incident surface 22 A repeats surface reflection and spreads in the light guide plate 22, and is emitted from the main plate surface (referred to as a light emitting surface 22 B) as planar light. . The light guide plate 22 is disposed in the chassis 26 with the light emission surface 22B facing the front side and the back surface along the bottom plate 26A of the chassis 26. The light exit surface 22B and the light incident surface 22A of the light guide plate 22 are substantially perpendicular.

On the back surface (back surface) of the light guide plate 22, a reflection sheet 27 that reflects the light emitted from the light guide plate 22 into the light guide plate 22 again is disposed (see FIG. 3). The reflection sheet 27 is made of synthetic resin (for example, made of foamed PET), and the surface thereof is white with excellent light reflectivity. The reflection sheet 27 is laid over substantially the entire area of the light guide plate 22 between the light guide plate 22 and the bottom plate 26 A of the chassis 26.

Further, on the front side of the light guide plate 22, an optical member 28 is disposed that uses the light transmitted through the light guide plate 22 as planar light. The optical member 28 is formed by laminating, for example, an optical sheet appropriately selected from a diffusion sheet, a lens sheet, a reflective polarizing sheet, and the like on the front side of the diffusion plate. The optical member 28 is placed on the front side of the frame 21 and is disposed between the liquid crystal panel 11 and the light guide plate 22.

The LED board 23 is obtained by mounting an LED (point light source) 25 on a printed board 24 having a longitudinal shape. As shown in FIG. 2, the LED substrate 23 is disposed along a long edge portion (upper edge portion and lower edge portion) extending in the longitudinal direction of the peripheral edge portion of the chassis 26, and is equivalent to the long side of the light guide plate 22. It has a length dimension.

The printed circuit board 24 is formed by forming a wiring pattern made of a metal film such as copper foil on a base material made of an insulating material such as a synthetic resin (glass epoxy resin, etc.) or ceramics, or a metal material such as an aluminum-based material A wiring pattern is formed on a base material made of an insulating layer and the like. A white resist (not shown) that easily reflects the light of the LED 25 is applied to the surface of the printed circuit board 24.

The LEDs 25 are mounted in a line (linearly) in the longitudinal direction along the center line in the short direction of the printed circuit board 24. The LED 25 is formed by sealing an LED chip (not shown) with a transparent resin such as an epoxy resin or a silicon resin. The LED 25 is molded into a rectangular parallelepiped shape in which the light emitting surface 25A (the surface opposite to the mounting surface with respect to the printed circuit board 24) is a flat surface, and the LED chip is sealed at the center. The LED chip has a single main emission wavelength, and specifically, a LED chip that emits blue light in a single color is used. On the other hand, in the resin material for sealing the LED chip, a phosphor that converts blue light emitted from the LED chip into white light is dispersed and blended, and the LED 25 can emit white light.

As shown in FIG. 3, the LED board 23 is disposed between the side plate 26 B of the chassis 26 and the light incident surface 22 A of the light guide plate 22 at a position slightly away from the light incident surface 22 A. The LED board 23 is disposed in a direction in which the light emitting surface 25 A of the LED 25 faces the light incident surface 22 A of the light guide plate 22, and approximately half of the LED board 23 has a positional relationship that protrudes to the front side from the light guide plate 22. . That is, the thickness dimension of the light guide plate 22 is approximately half the width of the LED substrate 23. And the light emission surface 22B of the light-guide plate 22 and the approximate center position of 25 A of light emission surfaces of LED25 become the positional relationship which substantially corresponds in the front and back direction.

The LED board 23 is surrounded by the reflector 30. The reflector 30 is made of aluminum or aluminum alloy, and has an elongated shape that covers the LED substrate 23 continuously in the longitudinal direction. The reflector 30 has a U-shaped cross section that surrounds the back side (the side opposite to the light emitting surface 25A side) of the LED substrate 23 and opens to the front side (the light emitting surface 25A side). The inner peripheral surface of the reflector 30 has a reflection function of efficiently reflecting the light from the LED substrate 23 and entering the light incident surface 22A of the light guide plate 22. In addition, it is good also as what equips the internal peripheral surface of the reflector 30 with a white reflective sheet, a specular reflective sheet, etc.

The reflector 30 covers a back plate (heat transfer portion) 31 that covers the back side of the LED board 23 (the side opposite to the side where the LED 25 is mounted on both the front and back sides of the printed board 24) and the front side of the LED board 23. It has a surface plate (light emitting part) 32 and a back plate 33 that covers the back side of the LED substrate 23 (see FIG. 4). The front plate 32 and the back plate 33 rise from the long edge of the back plate 31 and are substantially perpendicular to the back plate 31. The front plate 32 and the back plate 33 have substantially the same shape and the same size. The edge 32A on the opening side of the surface plate 32 protrudes substantially perpendicularly to the back plate 33 side, and the protruding end is located slightly on the front side of the LED 25 (see FIG. 5). The back plate 31 has a substantially rectangular shape whose width is slightly larger than that of the LED substrate 23, is arranged along the back surface of the LED substrate 23, and substantially the whole is in contact with the LED substrate 23.

The reflector 30 includes a first reflecting plate (first reflecting portion) 34 that reflects light from the LED substrate 23 and a second reflecting plate (second reflecting portion) that reflects the reflected light from the first reflecting plate 34. ) 35 is integrally provided (see FIG. 5).

The first reflector 34 is provided continuously to the surface plate 32 of the reflector 30. The first reflecting plate 34 has a shape that spreads outside the reflector 30 from the protruding end of the end edge portion 32 A of the surface plate 32. The first reflecting plate 34 as a whole spreads obliquely toward the outside of the reflector 30 in a direction that narrows the opening of the reflector 30 little by little.

The second reflecting plate 35 is continuously provided on the back plate 33 of the reflector 30. The second reflecting plate 35 is provided on the inner side (the side on which the LED substrate 23 is accommodated) of the back plate 33 and is configured to spread from the open end of the back plate 33 toward the back (the back plate 31 side). The second reflecting plate 35 as a whole spreads obliquely in a direction approaching the LED 25 little by little toward the back of the reflector 30.

A set of reflecting means composed of the first reflecting plate 34 and the second reflecting plate 35 is provided for each fixed position of the LED 25 on the LED substrate 23, that is, provided at an interval equivalent to the mounting pitch of the LED 25.

The inner peripheral surface of the first reflector 34 (referred to as the first reflective surface 36) and the inner peripheral surface of the second reflector 35 (referred to as the second reflective surface 37) are respectively elliptical mirrors having two focal points. Yes. Of the two focal points of the first reflecting surface 36, the first focal point F 1 is located at the center of the light emitting surface 25 A of the LED 25.

Of the two focal points of the second reflecting surface 37, the first focal point F 2 is located at the center of the light incident surface 22 A of the light guide plate 22 (center in the front and back direction of the light guide plate 22).
The second focal point F3 of the first reflecting surface 36 and the second focal point F4 of the second reflecting surface 37 are set to be at the same position. The second focal points F3 and F4 are set to be located at the same height as the substantially central position in the front and back direction of the light incident surface 22A of the light guide plate 22 at a position diagonally away from the center of the LED 25.

The first reflecting surface 36 is a part of a curved surface (spheroid surface) obtained by rotating an ellipse with a major axis LA1 passing through the first focal point F1 and the second focal point F3 as a rotational axis, specifically, a spheroidal surface. Among these, it is a portion located on the front side of the light guide plate 22. The first reflection surface 36 is a surface that extends in the light irradiation range of each LED 25, is a curved surface that extends outward from the position of the front-side end of the light incident surface 22 A of the light guide plate 22, and is the back side of the first reflection surface 36. The end is substantially the same as the light exit surface 22B of the light guide plate 22 in the front and back direction. The long axis LA1 of the first reflecting surface 36 is inclined from the center of the light emitting surface 25A of the LED 25 toward the oblique back side.

The second reflecting surface 37 is a part of a curved surface (spheroid surface) obtained by rotating an ellipse with the major axis LA2 passing through the first focal point F2 and the second focal point F4 as a rotational axis, specifically, a spheroidal surface. Among these, the portion extends from the back side of the LED 25 to the vicinity of the light incident surface 22A of the light guide plate 22 (near the edge of the reflection sheet 27). The major axis LA2 of the second reflecting surface 37 passes through the center position in the thickness direction of the light guide plate 22 and extends substantially parallel to the plate surface of the light guide plate 22, in other words, the light incident surface 22A of the light guide plate 22 and the LED 25. This is an axis extending substantially perpendicular to the light emitting surface 25A, and passes through a position slightly behind the back side end of the LED 25.

According to the present embodiment configured as described above, the following effects can be obtained.
The backlight device 20 of the present embodiment is a backlight device 20 including a light guide plate 22 and an LED substrate 23 arranged along the light incident surface 22A of the light guide plate 22, and the LED substrate 23 and the light incidence. Between the surface 22A, a first reflecting plate 34 that reflects light from the LED substrate 23 and a second reflecting plate 35 that reflects reflected light from the first reflecting plate 34 are provided, and the first reflecting plate is provided. 34 is provided at a position where the light traveling from the LED substrate 23 toward the outside of the light incident surface 22A can be reflected toward the second reflecting plate 35, and the second reflecting plate 35 has a focal point located on the light incident surface 22A. The concave mirror is set as follows.

As a result, of the light emitted from the LED substrate 23, the light traveling toward the outside of the light incident surface 22A is reflected by the first reflecting plate 34 and the second reflecting plate 35, and the light incident surface 22A (focal point) of the light guide plate 22 is reflected. Therefore, regardless of the thickness of the light guide plate 22, that is, even if the light guide plate 22 is thinned, the light of the LED substrate 23 can be efficiently incident on the light guide plate 22. Therefore, the light of the LED 25 can be efficiently incident on the light guide plate 22 even if the light guide plate 22 is thinned (about half of the conventional one) as in this embodiment. And since the thickness dimension of the light-guide plate 22 can be made into the half of the past, the weight can be halved and cost reduction can be aimed at.

The first reflector 34 and the second reflector 35 are elliptical mirrors having two focal points, and the first focal point F1 of the first reflector 34 is positioned on the light emitting surface 25A of the LED substrate 23. The first focal point F2 of the second reflecting plate 35 is set to be positioned on the light incident surface 22A, and the second focal point F3 of the first reflecting plate 34 and the second focal point F4 of the second reflecting plate 35 are set. , Are set to be the same position.

As a result, the light traveling from the LED substrate 23 toward the front side of the light incident surface 22A (the direction not directly incident on the light incident surface 22A) exits the first focal point F1 of the first reflecting surface 36 as shown in FIG. The light is reflected by the first reflecting surface 36 and travels toward the second focal point F3 of the first reflecting surface 36. Since the second focal point F3 of the first reflective surface 36 is at the same position as the second focal point F4 of the second reflective surface 37, the reflected light of the first reflective surface 36 is reflected by the second reflective surface 37 and is reflected by the second focal point F4. 2 toward the first focal point F2 of the reflecting surface 37. In this way, light directed from the LED substrate 23 in a direction not directly incident on the light incident surface 22A is reflected by the first reflecting plate 34 and the second reflecting plate 35 and gathers on the light incident surface 22A. The incident efficiency of light can be increased. The light traveling from the LED substrate 23 toward the back side is directly incident on the light incident surface 22A of the light guide plate 22 as shown in FIG. In FIGS. 5 and 6, the path of light emitted from the light emitting surface 25 A of the LED 25 and incident on the light incident surface 22 A is schematically illustrated by a one-dot chain line.

Further, a reflector 30 surrounding the LED substrate 23 is provided, and the reflector 30 has a surface plate 32 that covers the LED substrate 23 on the liquid crystal panel 11 side. Thereby, the unnecessary light leakage to the display surface 11A can be suppressed.

The reflector 30 is made of metal and has a back plate 33 along the plate surface of the LED substrate 23. Thereby, since the heat generated from the LED 25 is transmitted to the reflector 30 via the printed circuit board 24 and is dissipated, the dissipating area is increased by the amount of the reflector 30, so that the heat dissipation can be improved.
The reflector 30 is made of aluminum or aluminum alloy. Therefore, since the thermal conductivity of the reflector 30 is good, the heat dissipation can be improved.
Further, since the reflection sheet 27 is provided on the back surface side of the light guide plate 22, the light incident on the light guide plate 22 can be efficiently emitted.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

(1) In the above embodiment, the light source is the LED substrate 23, but is not limited thereto, and may be a cold cathode tube, for example.
(2) In the above-described embodiment, the first reflecting part 34 and the second reflecting part 35 are provided for each fixed position of the LED 25 on the LED substrate 23. In the case where N is narrow, the first reflecting portion and the second reflecting portion may be continuous in the longitudinal direction of the LED substrate.

(3) In the above embodiment, the first reflecting surface 36 and the second reflecting surface 37 are elliptical mirrors having two focal points. However, the present invention is not limited to this, and for example, the first reflecting surface and the second reflecting surface. May be a parabolic mirror, or only one of them may be a parabolic mirror.

(4) In the above embodiment, the LED 25 is molded in a rectangular parallelepiped shape with the light emitting surface 25A forming a flat surface. However, the present invention is not limited to this. For example, the LED may be a hemispherical dome shape with the light emitting surface forming a curved surface. Good.

(5) In the above embodiment, approximately half of the LED substrate 23 protrudes to the front side of the light guide plate 22, but not limited to this, approximately half of the LED substrate is behind the light guide plate. It is good also as the positional relationship which protrudes. In this case, the first reflecting portion may be disposed on the back side and the second reflecting portion may be disposed on the front side.

(6) In the above embodiment, the first focal point F2 of the second reflecting surface 37 is set to be positioned at the center of the light incident surface 22A. However, the present invention is not limited to this, and the first focal point of the second reflecting surface. May be set at any position within the range of the light incident surface.

(7) In the said embodiment, although the 1st reflective plate 34 and the 2nd reflective plate 35 are integrally provided in the reflector 30, you may provide not only in this but in a chassis, for example.
(8) In the above embodiment, the thickness dimension of the light guide plate 22 is approximately half the width of the LED substrate 23, but the present invention is applicable regardless of the thickness dimension of the light guide plate. be able to.

TV ... TV receiver, F1 ... first focus of the first reflector, F2 ... first focus of the second reflector, F3 ... second focus of the first reflector, F4 ... second focus of the second reflector, DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 20 ... Backlight device (illumination device), 22 ... Light guide plate, 22A ... Light incident surface (end surface), 23 ... LED board (light source) 24 ... printed circuit board, 25 ... LED, 25A ... light emitting surface, 27 ... reflecting sheet, 30 ... reflector, 31 ... back plate (heat transfer part), 32 ... surface plate (light emitting part), 34 ... first reflecting plate ( (First reflecting portion), 35 ... second reflecting plate (second reflecting portion)

Claims

A lighting device including a light guide plate and a light source disposed along an end surface of the light guide plate,
Between the light source and the end face, a first reflection part that reflects light from the light source and a second reflection part that reflects light reflected from the first reflection part are provided,
The first reflecting portion is provided at a position where light from the light source toward the outside of the end face can be reflected toward the second reflecting portion,
The illuminating device, wherein the second reflecting portion is a concave mirror set so that a focal point thereof is located on the end face.
The first reflecting portion and the second reflecting portion are elliptical mirrors having two focal points,
A first focal point of the first reflecting part is set to be located on a light emitting surface of the light source;
The first focal point of the second reflecting part is set to be located on the end face;
The lighting device according to claim 1, wherein the second focal point of the first reflecting unit and the second focal point of the second reflecting unit are set to be at the same position.
The illuminating device according to claim 2, wherein the first focal point of the second reflecting portion is set so as to be positioned at a substantially center of the end face in the front-back direction of the light guide plate.
The light source is an LED board formed by mounting LEDs on a printed board,
The lighting device according to any one of claims 1 to 3, wherein the light emitting surface of the LED is disposed so as to face the end surface.
The light source is an LED board formed by mounting LEDs on a printed board,
It is disposed with the light emitting surface of the LED facing the end surface,
4. The illumination device according to claim 2, wherein a first focal point of the first reflecting unit is set to be positioned at a substantially center of a light emitting surface of the LED.
The lighting device according to claim 4 or 5, wherein the LED has a rectangular parallelepiped shape in which a light emitting surface forms a flat surface.
The light guide plate and the light source are arranged such that one of the front and back surfaces of the light guide plate and the substantially center position of the light emitting surface of the light source substantially coincide with the front and back directions of the light guide plate. The lighting device according to any one of claims 1 to 6.
A reflector surrounding the light source is provided;
The lighting device according to any one of claims 1 to 7, wherein the first reflection unit and the second reflection unit are provided in the reflector.
An illumination device that emits light to a display panel,
The lighting device according to claim 8, wherein the reflector includes a light emitting unit that covers the display panel side of the light source.
The light source is an LED board formed by mounting LEDs on a printed board,
The lighting device according to claim 8 or 9, wherein the reflector is made of metal and has a heat transfer portion along a plate surface of the printed circuit board.
The lighting device according to any one of claims 8 to 10, wherein the reflector is made of aluminum or an aluminum alloy.
The lighting device according to any one of claims 1 to 11, wherein a reflection sheet is provided on a front surface side or a back surface side of the light guide plate.
A display device comprising: the illumination device according to any one of claims 1 to 12; and a display panel that performs display using light from the illumination device.
The display device according to claim 13, wherein the display panel is a liquid crystal panel using liquid crystal.
A television receiver comprising the display device according to claim 13 or 14.