WO2012073826A1

WO2012073826A1 - Illumination device, display device and television receiving device

Info

Publication number: WO2012073826A1
Application number: PCT/JP2011/077197
Authority: WO
Inventors: 良武石元
Original assignee: シャープ株式会社
Priority date: 2010-12-03
Filing date: 2011-11-25
Publication date: 2012-06-07

Abstract

The disclosed backlight device (illumination device) (12) is provided with: an LED (light source) (17); a light guide member (19) having a light emitting surface (19a) arranged with the edge part facing the LED (17) and emitting the light incident from said LED (17) to the edge part; and a first reflective sheet (reflective member) (22) reflecting the light in the light guide member (19) and arranged so as to be in contact with the edge surface (19d) of the light guide member (19), which is a surface adjacent to the light emitting surface (19a). When the first reflective sheet (22) is divided into at least a first region (22A) nearer the LED (17) and a second region (22B) farther from the LED (17), then, compared to the second region (22B), the first region (22A) has larger x and y chromaticity coordinate values in the CIE 1931 chromaticity diagram.

Description

Lighting device, display device, and television receiver

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

In recent years, the display elements of image display devices such as television receivers are shifting from conventional cathode ray tubes to thin display panels such as liquid crystal panels and plasma display panels, which enables thinning of image display devices. Since the liquid crystal panel used for the liquid crystal display device does not emit light by itself, a backlight device is separately required as a lighting device, and the backlight device is roughly classified into a direct type and an edge light type according to the mechanism. In order to further reduce the thickness of the liquid crystal display device, it is preferable to use an edge light type backlight device, and an example described in Patent Document 1 below is known. In this device, the light source is arranged in a facing manner with respect to a corner portion of the light guide member.

JP 2006-172785 A

(Problems to be solved by the invention)
By the way, the light emitted from the light source is propagated through the light guide member and then emitted to the outside from the light exit surface of the light guide member. Light on the short wavelength side such as light tends to scatter and tend to be emitted to the outside as compared to light on the long wavelength side such as light in the yellow or red wavelength region. For this reason, there is a possibility that a difference in the color of the emitted light may occur between the light emitting surface of the light guide member on the side closer to the light source and the side far from the light source, and this tendency is particularly noticeable when the liquid crystal display device is enlarged. There was a disagreement.

The present invention has been completed based on the above situation, and an object thereof is to suppress the occurrence of uneven color in the emitted light.

(Means for solving problems)
An illuminating device of the present invention includes a light source, a light guide member having an end facing the light source and having a light exit surface that emits light incident on the end from the light source, and the light guide. A first member that is disposed in contact with a surface adjacent to the light emitting surface of the light member and reflects the light in the light guide member, wherein the reflecting member is at least relatively close to the light source. And the second region relatively far from the light source, the first region has both x and y values that are chromaticity coordinate values of the CIE1931 chromaticity diagram as compared to the second region. It is relatively large.

The light that has entered the end of the light guide member from the light source is reflected by a reflecting member disposed in contact with a surface adjacent to the light emitting surface, propagates through the inside, and is then emitted from the light emitting surface. Light on the short wavelength side included in the light propagating through the light guide member tends to scatter and tend to be emitted to the outside as compared with light on the long wavelength side. For this reason, in the region relatively close to the light source of the light guide member, the emission of light on the short wavelength side tends to be excessive, and conversely in the region relatively far from the light source, the emission of light on the short wavelength side is insufficient. This tends to cause color unevenness in the light emitted from the light guide member.

Therefore, in the present invention, the x value and the y value, which are chromaticity coordinate values of the CIE1931 chromaticity diagram related to the first region relatively close to the light source, of the reflecting member are set to the second region relatively far from the light source. Both the x value and the y value are relatively large. According to such a configuration, the first region relatively close to the light source tends to reflect more light on the longer wavelength side and reduce the amount of reflected light on the shorter wavelength side than the second region. Therefore, in the region of the light guide member that is relatively close to the light source, emission is promoted for light on the long wavelength side, which tends to be short, whereas light on the short wavelength side, which tends to be excessive, is promoted. The emission is suppressed. On the other hand, the second region relatively far from the light source tends to reflect more light on the short wavelength side and reduce the amount of reflected light on the long wavelength side than the first region. In the region of the optical member that is relatively far from the light source, the emission of long-wavelength light that tends to be excessive is suppressed, whereas the emission of short-wavelength light that tends to be insufficient is promoted. The As described above, color unevenness that can occur between the light emitted from the region relatively close to the light source in the light guide member and the light emitted from the relatively distant region can be reduced. Suitable for enlargement. Furthermore, in the present invention, the reflection member prevents light from being emitted from the surface of the light guide member adjacent to the light emission surface, and the reflection member includes the first region and the second region described above. Therefore, the light from the light source can be efficiently used as the emitted light, the luminance can be improved, and the color unevenness can be prevented.

The following configuration is preferable as an embodiment of the present invention.
(1) Of the light guide member, a surface adjacent to the light exit surface includes a light incident surface on which light from the light source is incident, and the reflective member includes the light guide member of the light guide member. A surface adjacent to the light exit surface is disposed over the entire area excluding the light incident surface. In this way, light incident on the light incident surface included in the surface adjacent to the light exit surface of the light guide member from the light source excludes the light entrance surface on the surface adjacent to the light exit surface of the light guide member. By being reflected by the reflecting member disposed over the entire area, the light is efficiently emitted from the light emitting surface. As a result, the light utilization efficiency and luminance can be further improved, and it is more suitable for preventing color unevenness.

(2) The light source has a light distribution in which an optical axis that is a traveling direction of light having a peak emission intensity is parallel to the light emitting surface, and the reflecting member is orthogonal to the optical axis. It has a surface to do. In this way, light having a peak emission intensity among the light from the light source can be efficiently reflected by the reflecting member orthogonal to the optical axis that is the traveling direction, so that the use of light is possible. The efficiency and brightness are higher, and it is more suitable for preventing color unevenness.

(3) The 2nd reflection member distribute | arranged in contact with the surface on the opposite side to the said light-projection surface among the said light guide members is provided. If it does in this way, the light from the light source which entered into the light guide member is opposite to the light emission surface of the light guide member and the reflection member in contact with the surface adjacent to the light emission surface of the light guide member. After being propagated through the light guide member by being reflected by the second reflecting member in contact with the surface on the side, the light is emitted from the light emitting surface.

(4) When the second reflecting member is divided into at least a first region relatively close to the light source and a second region relatively distant from the light source, the first region is compared with the second region. Both the x value and the y value, which are chromaticity coordinate values in the CIE 1931 chromaticity diagram, are relatively large. In this way, the second reflecting member that is in contact with the surface opposite to the light emitting surface includes the first region and the second region in the same manner as the reflecting member described above. Among these, the color unevenness that can occur between the outgoing light from the region relatively close to the light source and the outgoing light from the region far from the light source can be alleviated more effectively.

(5) The chromaticity coordinate value of the CIE1931 chromaticity diagram relating to the first area is (x1, y1), the chromaticity coordinate value of the CIE1931 chromaticity diagram relating to the second area is (x2, y2), and white When the chromaticity coordinate value of the CIE1931 chromaticity diagram relating to the reference chromaticity is (x0, y0), the first area and the second area are in a relationship satisfying the following expressions (1) and (2) Each has a degree coordinate value.

[Equation 1]
x2 <x0 ≦ x1 (1)

[Equation 2]
y2 <y0 ≦ y1 (2)

In this way, the chromaticity of the second region can be made closer to the white reference chromaticity as compared with the case where the x1 value is smaller than the x0 value and the y1 value is smaller than the y0 value. The light reflection efficiency of the reflecting member becomes better as the chromaticity becomes closer to the white reference chromaticity. Therefore, the light reflection efficiency in the second region becomes better, thereby improving the luminance of the emitted light. It is suitable. Further, it is useful when the light emitted from the light source is white light or light having a color close to it.

(6) The chromaticity coordinate value of the CIE1931 chromaticity diagram relating to the first area is (x1, y1), the chromaticity coordinate value of the CIE1931 chromaticity diagram relating to the second area is (x2, y2), and white When the chromaticity coordinate value of the CIE1931 chromaticity diagram relating to the reference chromaticity is (x0, y0), the first region and the second region have colors satisfying the following expressions (3) and (4) Each has a degree coordinate value.

[Equation 3]
x2 ≦ x0 <x1 (3)

[Equation 4]
y2 ≦ y0 <y1 (4)

This makes it possible to make the chromaticity of the first region closer to the white reference chromaticity as compared with the case where the x2 value is larger than the x0 value and the y2 value is larger than the y0 value. The light reflection efficiency of the reflecting member becomes better as the chromaticity becomes closer to the white reference chromaticity. Therefore, the light reflection efficiency in the first region becomes better, thereby improving the luminance of the emitted light. It is suitable. Further, it is useful when the light emitted from the light source is white light or light having a color close to it.

(7) The first area and the second area have chromaticity coordinate values that satisfy the following expressions (5) and (6).

[Equation 5]
x2 <x0 <x1 (5)

[Equation 6]
y2 <y0 <y1 (6)

In this way, since both the first region and the second region have chromaticity close to the white reference chromaticity, both the light reflection efficiency in the first region and the second region are good, Therefore, it is more effective in improving the brightness of the emitted light. In addition, since the color exhibited by the first region and the color exhibited by the second region have a complementary relationship, it is particularly useful when the emitted light from the light source is white light.

(8) When the reflective member is divided into a third region adjacent to both the first region and the second region in addition to the first region, the third region is compared to the second region, Both the x value and the y value, which are chromaticity coordinate values in the CIE 1931 chromaticity diagram, are relatively small, and both the x value and the y value are relatively large compared to the first region. According to this configuration, the third region adjacent to both the first region and the second region of the reflecting member is light on the short wavelength side with respect to the reflected light amount of the light on the long wavelength side compared to the first region. However, the ratio of the reflected light amount of the short wavelength side to the reflected light amount of the light on the long wavelength side tends to be relatively small as compared with the second region. That is, in the third region, the ratio of the reflected light amount of the short wavelength side to the reflected light amount of the long wavelength side light is a value between the adjacent first region and the second region. Color unevenness is less likely to occur in the emitted light.

(9) The light guide member has a substantially square plate shape when seen in a plan view, and the one plate surface constitutes the light emitting surface, whereas the reflection member is arranged in contact with the end surface. The reflection member is composed of a plurality of divided reflection members divided for each of the end surfaces corresponding to the sides of the light guide member. In this way, when installing the reflecting member, it is only necessary to arrange the plurality of divided reflecting members for each end face corresponding to each side of the light guide member. Therefore, a reflecting member having a shape straddling a plurality of sides is used. Compared to the case, the positioning with respect to the light guide member is facilitated and the workability is excellent.

(10) The plurality of divided reflecting members include those in which the entire region is the first region and those in which the entire region is the second region. In this way, compared to the case where the first region and the second region are mixed in one divided reflecting member, the divided reflecting member can be easily manufactured, and the manufacturing cost can be reduced. Can be planned.

(11) The first region and the second region are made different from each other in chromaticity coordinate values of the CIE1931 chromaticity diagram by applying paint on the surface of the reflecting member. If it does in this way, the chromaticity in a 1st field and the 2nd field can be made appropriate by selecting the coating range (coating area), the kind of paint, etc. with respect to the surface of a reflective member, respectively. .

(12) A large number of dots made of the paint are formed on the reflecting member. In this way, it is possible to easily control the chromaticity in the first region and the second region according to the dot mode (area, distribution density, etc.).

(13) The dots are arranged such that the chromaticity coordinate values of the CIE 1931 chromaticity diagram in the first area and the second area become smaller in the direction away from the light source. In this way, since the chromaticity in the first region and the second region changes gently according to the distance from the light source, color unevenness of the emitted light in the light guide member can be more suitably suppressed.

(14) The first region and the second region may have different chromaticity coordinate values in the CIE 1931 chromaticity diagram by including a pigment in the reflecting member. If it does in this way, chromaticity in the 1st field and the 2nd field can be made appropriate by selecting the quantity (content concentration etc.) of the pigment contained in a reflective member, the kind of pigment, etc., respectively. .

(15) Whereas the light guide member has a substantially square shape when seen in a plane, the light source is opposed to a corner portion of the end portion of the light guide member and its optical axis is The light guide member is arranged to be inclined with respect to the side. In this way, it is possible to reduce the number of light sources installed and to set the optical axis of the light source relative to the side as compared with the case where a plurality of light sources are arranged in parallel along one side of the end portion of the light guide member. By tilting, light can be efficiently supplied into the light guide member.

(16) The light source is arranged so that an optical axis thereof substantially coincides with a diagonal line in the light guide member. In this way, compared to the case where the optical axis is set to intersect the diagonal line, the light from the light source reaches the corner on the side opposite to the light source in the light guide member along the optical axis. Since the distance becomes longer, a difference in the chromaticity of the emitted light is likely to occur between the light source member near the corner on the light source side and the corner near the light source side. Color unevenness can be effectively suppressed.

(17) Whereas the light guide member has a substantially square shape when seen in a plan view, a plurality of the light sources are arranged in parallel along one side of the end portions of the light guide member. In this way, light from a plurality of light sources can be incident on the light guide member, which is suitable for improving the luminance of the emitted light.

(18) Whereas the light guide member has a substantially rectangular shape when seen in a plane, the light source includes a plurality of light sources arranged in parallel along one short side of the end portions of the light guide member and each light. The axis is arranged so that it is almost coincident with the long side. In this way, since the distance from the light source to the short side of the light guide member opposite to the light source along the optical axis is equal to the long side of the light guide member, the light guide member Among them, although the difference in chromaticity of the emitted light is likely to occur between the short side near the light source and the short side opposite to the light source, the above-described configuration effectively suppresses uneven color of the emitted light. Can do.

(19) The light source is an LED. In this way, high brightness and low power consumption can be achieved.

(20) The LED includes an LED element that emits substantially blue monochromatic light, and a phosphor that emits light when excited by light from the LED element. In this way, the light emitted from the LED contains a lot of light in the blue wavelength region. Since a large amount of light in the blue wavelength region tends to be emitted in a region relatively close to the LED of the light guide member, there is a concern that the light will attenuate until reaching a region relatively far from the LED. However, the above-described configuration can effectively suppress color unevenness that may occur in the light emitted from the light guide member.

Next, in order to solve the above problem, a display device of the present invention includes the above-described illumination device and a display panel that performs display using light from the illumination device.

According to such a display device, the illumination device that supplies light to the display panel can suppress color unevenness in the emitted light, so that display with excellent display quality can be realized. It becomes.

A liquid crystal panel can be exemplified as the display panel. Such a display device can be applied as a liquid crystal display device to various uses such as a display of a television or a personal computer, and is particularly suitable for a large screen.

(The invention's effect)
According to the present invention, it is possible to suppress the occurrence of color unevenness in the light emitted from the light guide member.

1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention. The exploded perspective view which shows schematic structure of the liquid crystal display device with which a television receiver is equipped The top view which shows the arrangement configuration of the chassis, the light guide member, the 1st reflection sheet, and LED (LED board | substrate) in the backlight apparatus with which a liquid crystal display device is equipped. Sectional view taken along line iv-iv in FIG. The side view which shows the 1st division | segmentation reflective sheet distribute | arranged to the long-side end surface of the light guide member The side view which shows the 2nd division | segmentation reflective sheet distribute | arranged to the short side end surface of the light guide member Chromaticity diagram developed in 1931 by the CIE (International Lighting Commission) Enlarged view of the main part in FIG. The graph which shows the change of the chromaticity coordinate value from the X1 end (Y1 end) to the X2 end (Y2 end) in the first divided reflection sheet. The graph which shows the change of the chromaticity coordinate value from the X3 end (Y3 end) to the X4 end (Y4 end) in the second split reflection sheet. The principal part enlarged view in the CIE1931 chromaticity diagram which concerns on the modification 1 of Embodiment 1. FIG. The principal part enlarged view in the CIE1931 chromaticity diagram which concerns on the modification 2 of Embodiment 1. The principal part enlarged view in the CIE1931 chromaticity diagram which concerns on the modification 3 of Embodiment 1. FIG. The principal part enlarged view in the CIE1931 chromaticity diagram which concerns on the modification 4 of Embodiment 1. FIG. The principal part enlarged view in the CIE1931 chromaticity diagram which concerns on the modification 5 of Embodiment 1. FIG. The principal part enlarged view in the CIE1931 chromaticity diagram which concerns on the modification 6 of Embodiment 1. FIG. The top view which shows the arrangement configuration of the chassis in the backlight apparatus which concerns on Embodiment 2 of this invention, a light guide member, a 1st reflective sheet, and LED (LED board | substrate). Enlarged view of relevant parts in CIE1931 chromaticity diagram The graph which shows the change of the chromaticity coordinate value from the X1 end (Y1 end) to the X2 end (Y2 end) in the first divided reflection sheet. The graph which shows the change of the chromaticity coordinate value from the X3 end (Y3 end) to the X4 end (Y4 end) in the second split reflection sheet. The side view of the division | segmentation reflective sheet | seat which concerns on Embodiment 3 of this invention. Expanded side view of split reflective sheet The graph which shows the change of the chromaticity coordinate value from the X1 end (Y1 end) to the X2 end (Y2 end) in the first divided reflection sheet. The graph which shows the change of the chromaticity coordinate value from the X3 end (Y3 end) to the X4 end (Y4 end) in the second split reflection sheet. The top view which shows chromaticity distribution of the 2nd reflection sheet which concerns on Embodiment 5 of this invention. The top view which shows the arrangement structure of the chassis in the backlight apparatus which concerns on Embodiment 6 of this invention, a light guide member, a 1st reflective sheet, and LED (LED board | substrate). The graph which shows the change of the chromaticity coordinate value from the Y1 end to the Y2 end in the first divided reflection sheet The graph which shows the change of the chromaticity coordinate value from the X1 end to the X2 end in the second divided reflection sheet The top view which shows the arrangement configuration of the chassis in the backlight apparatus which concerns on Embodiment 7 of this invention, a light guide member, a 1st reflective sheet, and LED (LED board | substrate). The graph which shows the change of the chromaticity coordinate value from the Y1 end to the Y2 end in the first divided reflection sheet The top view which shows the arrangement structure of the chassis in the backlight apparatus which concerns on Embodiment 8 of this invention, a light guide member, a 1st reflective sheet, and LED (LED board | substrate). The top view which shows the arrangement configuration of the chassis, the light guide member, the 1st reflective sheet, and LED (LED board | substrate) in the backlight apparatus which concerns on Embodiment 9 of this invention. The top view which shows the arrangement structure of the chassis in the backlight apparatus which concerns on Embodiment 10 of this invention, a light guide member, a 1st reflective sheet, and LED (LED board | substrate). The top view which shows the arrangement configuration of the chassis, the 1st reflective sheet, and LED (LED board | substrate) in the backlight apparatus which concerns on other embodiment (1) of this invention. The graph which shows the change of the chromaticity coordinate value from the X1 end (Y1 end) to the X2 end (Y2 end) in the divided reflection sheet. Plan sectional drawing which shows the arrangement configuration of the chassis, the 1st reflective sheet, and LED (LED board | substrate) in the backlight apparatus which concerns on other embodiment (2) of this invention. The chromaticity coordinate values from the X1 end and X3 end (Y1 end, Y3 end) to the X2 end, X4 end (Y2 end, Y4 end) in the divided reflection sheet according to another embodiment (3) of the present invention Graph showing change Chromaticity coordinate values from the X1 end and X3 end (Y1 end, Y3 end) to the X2 end, X4 end (Y2 end, Y4 end) in the divided reflection sheet according to another embodiment (4) of the present invention Graph showing change The principal part enlarged view in the CIE1931 chromaticity diagram which concerns on other embodiment (5) of this invention. The principal part enlarged view in the CIE1931 chromaticity diagram which concerns on other embodiment (5) of this invention.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In this embodiment, the liquid crystal display device 10 is illustrated. In addition, a part of each drawing shows an X axis, a Y axis, and a Z axis, and each axis direction is drawn to be a direction shown in each drawing. Moreover, let the upper side shown in FIG. 4 be a front side, and let the lower side of the figure be a back side.

As shown in FIG. 1, the television receiver TV according to the present embodiment includes a liquid crystal display device 10, front and back cabinets Ca and Cb that are accommodated so as to sandwich the liquid crystal display device 10, a power source P, a tuner T, And a stand S. The liquid crystal display device (display device) 10 has a horizontally long (longitudinal) rectangular shape (rectangular shape) as a whole and is accommodated in a vertically placed state. As shown in FIG. 2, the liquid crystal display device 10 includes a liquid crystal panel 11 that is a display panel and a backlight device (illumination device) 12 that is an external light source, which are integrated by a frame-like bezel 13 or the like. Is supposed to be retained.

As shown in FIG. 2, the liquid crystal panel 11 has a horizontally long (longitudinal) rectangular shape (rectangular shape), that is, a rectangular shape when viewed in plan, and is attached with a pair of glass substrates separated by a predetermined gap. In addition, the liquid crystal is sealed between the glass substrates. One glass substrate is provided with a switching element (for example, TFT) connected to a source wiring and a gate wiring orthogonal to each other, a pixel electrode connected to the switching element, an alignment film, and the like. The substrate is provided with a color filter and counter electrodes in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement, and an alignment film. A polarizing plate is disposed on the outside of both substrates.

As shown in FIG. 2, the backlight device 12 covers a substantially box-shaped chassis 14 having an opening that opens toward the light emission surface side (the liquid crystal panel 11 side), and covers the opening of the chassis 14. The optical member 15 group arranged as described above. Further, in the chassis 14, an LED 17 (Light Emitting Diode) as a light source, an LED substrate 18 on which the LED 17 is mounted, a heat dissipation member 20 to which the LED substrate 18 is attached, and light from the LED 17 are guided. The light guide member 19 that leads to the optical member 15 (the liquid crystal panel 11), the reflection sheet 21 that is disposed in contact with the surface of the light guide member 19 and reflects the light in the light guide member 19, and the light guide member And a frame 16 for holding 19 from the front side. The backlight device 12 is of a so-called edge light type (side light type) in which the LEDs 17 are arranged opposite to each other at one end portion of the light guide member 19. Below, each component of the backlight apparatus 12 is demonstrated in detail.

The chassis 14 is made of a metal plate such as an aluminum plate or an electrogalvanized steel plate (SECC), for example, and as shown in FIGS. 2 and 3, a bottom plate having a horizontally long rectangular shape (rectangular shape) like the liquid crystal panel 11. 14a and a pair of side plates 14b rising from both outer ends on the long side of the bottom plate 14a. The long side direction of the chassis 14 (bottom plate 14a) coincides with the X-axis direction (horizontal direction), and the short side direction coincides with the Y-axis direction (vertical direction). Further, the frame 16 and the bezel 13 can be screwed to the side plate 14b.

As shown in FIG. 2, the optical member 15 has a horizontally long rectangular shape (rectangular shape) in a plan view, like the liquid crystal panel 11 and the chassis 14. The optical member 15 is placed on the front side (light emitting side) of the light guide member 19 and is disposed between the liquid crystal panel 11 and the light guide member 19. The optical member 15 includes a diffusion plate 15a disposed on the back side (light guide member 19 side, opposite to the light emitting side) and an optical sheet 15b disposed on the front side (liquid crystal panel 11 side, light emitting side). Composed. The diffusing plate 15a has a structure in which a large number of diffusing particles are dispersed in a substantially transparent resin-made base material having a predetermined thickness, and has a function of diffusing transmitted light. The optical sheet 15b has a sheet shape that is thinner than the diffusion plate 15a, and two optical sheets 15b are laminated. Specific types of the optical sheet 15b include, for example, a diffusion sheet, a lens sheet, a reflective polarizing sheet, and the like, which can be appropriately selected and used.

As shown in FIG. 2, the frame 16 is made of synthetic resin, and is formed in a frame shape (frame shape) extending along the outer peripheral end of the light guide member 19. It is possible to hold the outer peripheral edge from the front side over almost the entire circumference. Further, the frame 16 can receive the outer peripheral end of the liquid crystal panel 11 from the back side.

As shown in FIGS. 3 and 4, the LED 17 has a configuration in which an LED chip (LED element, light emitting element) made of, for example, an InGaN-based material is sealed with a resin material on a substrate portion fixed to the LED substrate 18. Is done. The LED chip mounted on the substrate portion has a single peak wavelength in a range of 435 nm to 480 nm, that is, a blue wavelength region, and emits blue monochromatic light. The main emission wavelength of the LED chip is more preferably in the range of 440 nm to 460 nm, specifically, for example, 451 nm. As a result, blue single color light having excellent color purity is emitted from the LED chip. On the other hand, the resin material that seals the LED chip is dispersed and blended with a phosphor that emits a predetermined color when excited by the blue light emitted from the LED chip, and generally emits white light as a whole. It is said. In addition, as the phosphor, for example, a yellow phosphor that emits yellow light, a green phosphor that emits green light, and a red phosphor that emits red light are used in appropriate combination, or any one of them is used. It can be used alone. The LED 17 is a so-called top type in which a surface opposite to the mounting surface with respect to the LED substrate 18 is a light emitting surface. The light emitted from the LED 17 spreads radially to some extent within a predetermined angle range around the optical axis LA, but its directivity is higher than that of a cold cathode tube or the like. Here, the “optical axis LA” is the traveling direction of light having the highest light emission intensity (the light emission intensity reaches a peak) among the light emitted from the light emitting surface of the LED 17.

The LED substrate 18 has a plate shape made of synthetic resin (such as glass epoxy resin), and has a white surface with excellent light reflectivity. As shown in FIGS. 3 and 4, the LED substrate 18 is arranged at one corner (lower left corner shown in FIG. 3) of the four corners in the chassis 14, and the plate surface is the Z axis. Although it is orthogonal to the direction, it is inclined to both the X-axis direction and the Y-axis direction and is opposed to the corner of the light guide member 19. The LED 17 is surface-mounted on the plate surface of the LED substrate 18 facing the light guide member 19 side, and this is the mounting surface. The mounted LED 17 has an orientation distribution in which the optical axis LA is parallel to a surface (light emitting surface 19a described later) along the X-axis direction and the Y-axis direction. Specifically, the optical axis LA of the LED 17 is along the normal direction with respect to the mounting surface (plate surface) of the LED substrate 18 and is orthogonal to the Z-axis direction, but is in the X-axis direction and the Y-axis direction (guided). The optical member 19 is inclined with respect to both the long side and the short side). In FIG. 3, the optical axis LA is illustrated by a two-dot chain line. A wiring pattern (not shown) made of a metal film (copper foil or the like) is formed on the mounting surface of the LED substrate 18, and terminal portions formed at both ends of the wiring pattern are connected to an external drive circuit. As a result, driving power can be supplied to each LED 17. In addition, as a raw material used for the LED board 18, it is also possible to set it as the structure which used metal materials, such as the same aluminum-type material as the chassis 14, for example, and formed the wiring pattern through the insulating layer on the surface.

The heat dissipating member 20 is made of metal having excellent thermal conductivity, and is composed of a bottom portion 20a along the bottom plate 14a of the chassis 14 and a rising portion 20b rising from the end of the bottom portion 20a toward the front side. The cross section is substantially L-shaped. The rising portion 20 b of the heat radiating member 20 is attached to the surface of the LED substrate 18 opposite to the mounting surface of the LED 17. By fixing the bottom portion 20a of the heat dissipation member 20 to the bottom plate 14a of the chassis 14, the LED 17 and the LED board 18 are attached to the chassis 14 and efficient heat dissipation from the LED 17 to the chassis 14 is achieved.

The light guide member 19 is made of a synthetic resin material (for example, acrylic or the like) having a refractive index sufficiently higher than that of air and substantially transparent (excellent translucency). As shown in FIGS. 2 and 3, the light guide member 19 is formed in a plate shape and has a horizontally long substantially rectangular shape (substantially rectangular shape) when viewed in plan, like the liquid crystal panel 11 and the chassis 14. The long side direction on the surface coincides with the X-axis direction, the short side direction coincides with the Y-axis direction, and the plate thickness direction (direction along the end surface) perpendicular to the plate surface coincides with the Z-axis direction. Of the four corners constituting the outer peripheral end of the light guide member 19, the LED 17 described above is arranged in an opposing manner at one corner (lower left corner shown in FIG. 3) and light from the LED 17 A light incident surface 19b is formed. The light incident surface 19b is parallel to the plate surface of the LED substrate 18 and the light emitting surface of the LED 17, and is in the X-axis direction and the Y-axis direction, that is, both the long side and the short side of the light guide member 19. Inclined form. That is, the light incident surface 19b is formed by obliquely cutting a corner portion of the light guide member 19 facing the LED 17. It can be said that the light incident surface 19 b constitutes a part of the outer peripheral end surface of the light guide member 19. The LED 17 has an optical axis LA that substantially coincides with the diagonal line of the light guide member 19, and is directed to the corner of the light guide member 19 opposite to the LED 17 side. The light guide member 19 has a function of introducing the light emitted from the LED 17 and raising and emitting the light toward the optical member 15 side (Z-axis direction) while propagating the light inside.

Of the pair of plate surfaces of the light guide member 19 having a flat plate shape parallel to the liquid crystal panel 11 and the optical member 15, the plate surface facing the front side, as shown in FIG. A light exit surface 19 a that emits light toward the panel 11 is formed. The light emission surface 19a is a surface parallel to the X-axis direction and the Y-axis direction (parallel to the optical axis LA of the LED 17), in other words, on the light incident surface 19b (each end surface of the light guide member 19). The surface is substantially orthogonal to the surface. On the other hand, the reflection sheet 21 is in contact with the end surface 19 d of the outer peripheral end surface of the light guide member 19 excluding the light incident surface 19 b and the back surface (bottom surface) 19 c of the light guide member 19. By reflecting the light in the light guide member 19 by the reflection sheet 21, it is possible to efficiently use the light from the LED 17 as outgoing light. Next, the reflection sheet 21 will be described in detail.

The reflection sheet 21 is formed of a base material made of a synthetic resin material having a white surface with excellent light reflectivity. As shown in FIG. 2, the reflection sheet 21 is formed on the outer peripheral end surface of the light guide member 19, that is, the light emission surface 19a. Among the adjacent surfaces, the first reflection sheet 22 arranged in contact with the end surface 19d excluding the light incident surface 19b, and the plate surface 19c on the back side of the plate surface of the light guide member 19, that is, the light emission surface 19a The second reflection sheet 23 is arranged in contact with the opposite plate surface 19c. Among these, the 2nd reflective sheet 23 is demonstrated previously. As shown in FIGS. 2 and 4, the second reflection sheet 23 has a horizontally long rectangular shape (rectangular shape) as viewed from above and is larger than the light guide member 19. The light guide member 19 covers the entire plate surface 19c opposite to the light exit surface 19a. Thereby, the 2nd reflection sheet 23 can reflect the light which goes to the back side (bottom plate 14a side) among the lights which exist in the light guide member 19 efficiently with almost no leakage. Most of the light reflected by the second reflection sheet 23 goes directly to the light exit surface 19a. The second reflection sheet 23 protrudes outward from the light incident surface 19b of the light guide member 19, that is, to the LED 17 side, so that the light from the LED 17 can be efficiently incident on the light incident surface 19b ( FIG. 4). It can be said that the second reflection sheet 23 is arranged in a shape sandwiched between the bottom plate 14 a of the chassis 14 and the light guide member 19.

Note that at least one of the light exit surface 19a and the plate surface 19c on the opposite side of the light guide member 19 has a reflecting portion (not shown) that reflects internal light or a scattering portion that scatters internal light ( (Not shown) is patterned so as to have a predetermined in-plane distribution, and thereby, the emitted light from the light emitting surface 19a is controlled to have a uniform distribution in the surface.

Subsequently, the first reflection sheet 22 will be described in detail. As shown in FIGS. 2 and 3, the first reflection sheet 22 covers almost the entire region of the end surface 19 d excluding the light incident surface 19 b in the outer peripheral end surface of the light guide member 19. Of the light existing in the light guide member 19, the first reflective sheet 22 efficiently reflects light toward the end surface 19 d of the outer peripheral end surface of the light guide member 19 excluding the light incident surface 19 b with almost no leakage. Therefore, the amount of light emitted from the light exit surface 19a, that is, the brightness of the emitted light can be improved by preventing light from exiting from the end surface 19d to the outside as much as possible. Moreover, since the first reflection sheet 22 has a surface along the Z-axis direction, that is, a surface orthogonal to the optical axis LA of the LED 17, light having a peak emission intensity among the light emitted from the LED 17. The light can be efficiently reflected, and thus the light utilization efficiency and the brightness of the emitted light can be further increased. More specifically, the first reflection sheet 22 is divided into four corresponding to the pair of long side end surfaces 19d1 and the pair of short side end surfaces 19d2 constituting the end surface 19d of the light guide member 19. That is, the first reflection sheet 22 is composed of four divided reflection sheets 22 S divided for each of the four end surfaces 19

d

1 and 19 d 2 corresponding to the long sides and the short sides of the light guide member 19. Each divided reflection sheet 22S has substantially the same size (area) as the corresponding end face 22d of the light guide member 19, and each of the divided reflection sheets 22S has a long side direction (X-axis direction) or a short side direction ( It has an elongated rectangular shape extending along the (Y-axis direction). Each divided reflection sheet 22S is fixed to each end face 19d of the light guide member 19 with almost no gap using a substantially transparent adhesive or the like.

By the way, in the edge light type backlight device 12 as described above, the light emitted from the LED 17 is reflected by the reflection sheet 21 or totally reflected by the light emitting surface 19 a of the light guide member 19. Thus, after propagating through the light guide member 19, the light is emitted from the light exit surface 19 a of the light guide member 19 to the outside. In this process, light on the short wavelength side included in the light emitted from the LED 17, specifically light in the blue wavelength region, for example, is light in the long wavelength side, specifically in the yellow or red wavelength region, for example. Compared to light or the like, scattering tends to occur and tends to be emitted to the outside. As a result, on the side of the light exit surface 19a of the light guide member 19 that is closer to the LED 17, more light on the short wavelength side is emitted and the emitted light tends to have a blue tint, for example. On the far side, more light on the long wavelength side is emitted, and the emitted light tends to be yellowish, for example. For this reason, color unevenness may occur in the light emitted from the light guide member 19, and particularly when the liquid crystal display device 10 is increased in size, the tendency tends to become remarkable.

Therefore, in the present embodiment, as shown in FIGS. 5 and 6, the first reflection sheet 22 disposed in contact with the end surface 19 d adjacent to the light emission surface 19 a of the light guide member 19 is relatively relative to the LED 17. When the first area 22A is divided into the first area 22A that is closer and the second area 22B that is relatively far from the LED 17, the CIE (Commission Internationale de l'Eclairage) is compared with the second region 22B. ) The x and y values, which are chromaticity coordinate values in the 1931 chromaticity diagram, are set to be relatively large. The CIE 1931 chromaticity diagram is as shown in FIG. 7, and the x-axis on the horizontal axis and the y-axis on the vertical axis indicate the x value and y value, which are chromaticity coordinate values, respectively. In FIG. 7 which is a 1931 chromaticity diagram, the point W represents the white reference chromaticity, and as the x value and the y value both decrease from the point W related to the white reference chromaticity, the blueness becomes stronger. In addition, the yellowness tends to increase as the x value and the y value both increase. Hereinafter, the aspect and each chromaticity in the first region 22A and the second region 22B will be described in detail.

As shown in FIGS. 2 and 3, the first region 22 A and the second region 22 B are included in the four corners of the light guide member 19 in the first reflection sheet 22 disposed on the end surface 19 d of the light guide member 19. The light incident surface 19b is divided with a pair of corners at a diagonal position excluding the corners as a boundary. A diagonal line connecting a pair of corners located at the boundary between the

regions

22A and 22B in the first reflection sheet 22 has a relationship intersecting the optical axis LA of the LED 17. The area ratios of the first region 22A and the second region 22B are substantially equal. 2, 5, and 6, the first region 22 A and the second region 22 B having different chromaticities are illustrated in different shades for distinction. Specifically, among the four divided reflection sheets 22S constituting the first reflection sheet 22, a pair of ones arranged adjacent to the LED 17 (light incident surface 19b of the light guide member 19) is the first region 22A. The remaining pair of sheets is the second divided reflection sheet 22SB that forms the second region 22B. The first divided reflection sheet 22SA is arranged on the long side end surface 19d1 and the short side end surface 19d2 adjacent to each other across the light incident surface 19b of the end surface 19d of the light guide member 19 in the divided reflection sheet 22S. . On the other hand, the second divided reflection sheet 22SB has a long side end face 19d1 and a short edge adjacent to each other across a corner portion diagonal to the light incident surface 19b of the end face 19d of the light guide member 19 in the divided reflection sheet 22S. It is arranged on the side end face 19d2. The first divided reflection sheet 22SA and the second divided reflection sheet 22SB have different chromaticities as shown in FIGS. 5 and 6, and will be described in detail below.

The first divided reflection sheet 22SA constituting the first region 22A and the second divided reflection sheet 22SB constituting the second region 22B are coated (printed) on the surface of the base material forming each divided reflection sheet 22S. By doing so, they have different chromaticities. In applying the paint to the base material of each divided reflection sheet 22S, for example, printing means such as screen printing and ink jet printing can be employed. In the present embodiment, two types of paints having different chromaticities are used in the first region 22A (first divided reflection sheet 22SA) and the second region 22B (second divided reflection sheet 22SB), respectively. That is, the first paint is used for the first region 22A, and the second paint having a chromaticity different from that of the first paint is used for the second region 22B. The first paint is such that the reflected light from its application surface is more yellowish than at least the light emitted from the LED 17, and the second paint is applied to the first paint. The reflected light from the surface contains at least a short wavelength side light more than the light emitted from the LED 17 and is bluish.

Subsequently, each chromaticity of the first region 22A and the second region 22B will be described in detail with reference to FIGS. FIG. 8 is an enlarged view of the 1931 chromaticity diagram, where point A represents the chromaticity of the first region 22A, point B represents the chromaticity of the second region 22B, and point W is white. It represents the reference chromaticity. 9 shows the chromaticity coordinate values from the X1 end (Y1 end) on the LED 17 side shown in FIG. 3 to the opposite X2 end (Y2 end) in the first divided reflective sheet 22SA of the first reflective sheets 22. It is the graph which plotted x value and y value which are. FIG. 9 shows the chromaticity coordinate values from the X3 end (Y3 end) on the LED 17 side shown in FIG. 3 to the X4 end (Y4 end) on the opposite side in the second divided reflection sheet 22SB of the first reflection sheet 22. It is the graph which plotted x value and y value which are. In the graphs of FIGS. 9 and 10, for convenience, the x value and the y value are shown on the same coordinate axis, but the x value and the y value are only from the X1 end (Y1 end) or the X3 end (Y3 end). This indicates that the values (magnitudes) tend to be the same until the X2 end (Y2 end) or the X4 end (Y4 end), and that the x value and the y value are necessarily the same value. It is not a thing. That is, the x value (x1) and the y value (y1) related to the point A may be the same value or different values, and the x value (x2) and the y value (y2) related to the point B are These may be the same value or different values. In the present embodiment, the white reference chromaticity described above is used as the chromaticity of the emitted light (white light) in the LED 17 included in the backlight device 12, and the chromaticity coordinate value (x0, y0) is, for example, (0. 272, 0.277). The chromaticity coordinate values of each chromaticity in the first area 22A and the second area 22B are obtained by irradiating each

area

22A, 22B with light emitted from the LED 17 included in the backlight device 12, and using the reflected light as a chromaticity meter. It is obtained by measuring by.

The chromaticity coordinate value related to the chromaticity of the first region 22A is (x1, y1), the chromaticity coordinate value related to the chromaticity of the second region 22B is (x2, y2), and the color related to the white reference chromaticity When the chromaticity coordinate value is (x0, y0), the chromaticity coordinate values in the first region 22A and the second region 22B satisfy the following expressions (5) and (6), respectively. That is, the chromaticity coordinate values (x1, y1) relating to the chromaticity of the first region 22A are respectively larger than the chromaticity coordinate values (x2, y2) relating to the chromaticity of the second region 22B, and the white reference color The chromaticity coordinate values (x0, y0) related to the degree are each larger. Therefore, when the light (white light) from the LED 17 is irradiated to the first region 22A, the reflected light contains at least a longer wavelength side light than the light emitted from the LED 17 and becomes yellowish. . Most of the reflected light from the first region 22 A is directed to a region relatively close to the LED 17 in the light emitting surface 19 a of the light guide member 19. On the other hand, in the region relatively close to the LED 17 in the light emitting surface 19a, the light on the short wavelength side is easily emitted as described above, and the emitted light tends to have a blue tint. The emitted light can be made substantially white light by adding a yellowish color that is a complementary color to the reflected light.

[Equation 7]
x2 <x0 <x1 (5)
[Equation 8]
y2 <y0 <y1 (6)

Conversely, the chromaticity coordinate values (x2, y2) relating to the chromaticity of the second region 22B are smaller than the chromaticity coordinate values (x1, y1) relating to the chromaticity of the first region 22A, respectively, and the white reference The chromaticity coordinate values (x0, y0) relating to chromaticity are each smaller. Therefore, when the light from the LED 17 is irradiated to the second region 22B, the reflected light is at least bluer than the light emitted from the LED 17. That is, it can be said that the reflected light (blueish light) from the second region 22B has a complementary color relationship with the reflected light (yellowish light) from the first region 22A. Most of the reflected light by the second region 22B is directed to a region relatively far from the LED 17 in the light emitting surface 19a of the light guide member 19. On the other hand, in the region relatively far from the LED 17 in the light exit surface 19a, the light on the long wavelength side is likely to be emitted as described above, and the emitted light tends to be yellowish. By making the reflected light of the color bluish, which is a complementary color, the emitted light can be made substantially white light. As described above, the light emitted from the light exit surface 19a is less likely to cause color unevenness over the entire area.

More specifically, as shown in FIG. 8, the point A related to the chromaticity of the first region 22A is a straight line connecting the point B related to the chromaticity of the second region 22B and the point W related to the white reference chromaticity. The point B relating to the chromaticity of the second region 22B exists on a straight line connecting the point A relating to the chromaticity of the first region 22A and the point W relating to the white reference chromaticity. ing. And the point W exists in the substantially middle position of the point A and the point B. In other words, the point A and the point B are in the position which sandwiched the point W and the distance from the point W is substantially equal. Is done. Thus, since both the first region 22A and the second region 22B have chromaticity close to the white reference chromaticity, both the light reflection efficiency in the first region 22A and the second region 22B is good. It has become a thing. The reason is that, as the chromaticity of the surface of the reflection sheet 21 approaches the reference chromaticity of white, the amount of light absorption decreases and the light is reflected to all wavelengths without loss, and the light reflection efficiency (utilization efficiency) is high. This is because the design can be increased. In other words, the first reflection sheet 22 according to the present embodiment suppresses the decrease in the light use efficiency by minimizing the light absorption generated by giving the first region 22A and the second region 22B color. By doing so, the brightness of the reflected light can be maintained high. Further, the chromaticity coordinate values in the first area 22A and the second area 22B are constant values over the entire area, as shown in FIGS. In order to manufacture the first reflection sheet 22 having such a chromaticity distribution, for example, a first coating material having a constant concentration is applied to the base material of the first divided reflection sheet 22SA forming the first region 22A with a uniform film thickness. The second coating material having a constant concentration may be applied with a uniform film thickness to the base material of the second divided reflection sheet 22SB forming the second region 22B.

This embodiment has the structure as described above, and its operation will be described next. When the power supply of the liquid crystal display device 10 having the above configuration is turned on, the drive of the liquid crystal panel 11 is controlled by a control circuit (not shown), and the drive of the LEDs 17 on the LED substrate 18 is controlled. Light from the LED 17 is guided to the liquid crystal panel 11 by being guided by the light guide member 19, and a predetermined image is displayed on the liquid crystal panel 11. Hereinafter, the operation of the light guide member 19 will be described in detail.

When the LED 17 is turned on, as shown in FIGS. 3 and 4, the emitted light enters the light guide member 19 from the light incident surface 19 b disposed at one corner of the light guide member 19, and the reflection sheet 21. Or is totally reflected by the light exit surface 19a which is an interface with the outside of the light guide member 19, and propagates inside. The light propagating through the light guide member 19 is scattered by the scattering portion, so that the incident angle with respect to the light exit surface 19a does not exceed the critical angle, and the light is emitted from the light exit surface 19a on the front side (the liquid crystal panel 11 side). It is emitted to the outside. Specifically, the light existing in the light guide member 19 contacts the reflection sheet 21 in contact with the

surfaces

19c and 19d except for the light exit surface 19a of the light guide member 19, that is, the end surfaces 19d except for the light incident surface 19b. While being reflected by the first reflection sheet 22 and the second reflection sheet 23 in contact with the plate surface 19c opposite to the light emission surface 19a, only emission from the light emission surface 19a is allowed. The emission from the

other surfaces

19c and 19d is restricted. In particular, since the end face 19d of the light guide member 19 is orthogonal to the optical axis LA of the LED 17, the light traveling along the optical axis LA has an incident angle that does not exceed the critical angle with respect to the end face 19d. However, by controlling the emission of light traveling along the optical axis LA by the first reflection sheet 22, it is possible to improve the light utilization efficiency. The brightness of the emitted light can be improved. Here, among the light propagating in the light guide member 19, the light on the short wavelength side tends to be scattered as compared with the light on the long wavelength side, so that it is relatively close to the LED 17 on the light exit surface 19 a. In the region (region overlapped with the first region 22A in plan view), light on the short wavelength side tends to be emitted more than light on the long wavelength side, and the amount of emitted light tends to be excessive. In a region far away (a region overlapping the second region 22B in plan view), the amount of light emitted from the short wavelength side tends to be insufficient compared to the light from the long wavelength side.

In this regard, in the present embodiment, as shown in FIGS. 2 and 3, the first region of the first reflection sheet 22 constituting the reflection sheet 21 is relatively close to the LED 17 and has a relatively large chromaticity coordinate value. 22A and the second region 22B that is relatively far from the LED 17 and relatively small in chromaticity coordinate value are included, so that the reflected light from the first region 22A includes a lot of light on the long wavelength side. In addition, a large amount of light on the short wavelength side can be included in the reflected light from the second region 22B. Most of the reflected light from the first region 22A is directed directly to a region relatively close to the LED 17 on the light emitting surface 19a (a region overlapping the first region 22A in plan view), and thus tends to be insufficient in the same region. The emission of light on the long wavelength side can be promoted. Thereby, the light emitted from the region relatively close to the LED 17 in the light emitting surface 19a includes the light on the short wavelength side and the light on the long wavelength side with a good balance. On the other hand, most of the reflected light from the second region 22B is directly directed to a region relatively far from the LED 17 in the light emitting surface 19a (a region overlapping the second region 22B in plan view), so that the shortage in the same region is insufficient. It is possible to promote the emission of light on the short wavelength side that tends to occur. As a result, the light emitted from the region relatively far from the LED 17 in the light emitting surface 19a includes the light on the short wavelength side and the light on the long wavelength side in a well-balanced manner. As described above, the difference in color that can occur between the outgoing light from the region of the light emitting surface 19a that is relatively close to the LED 17 and the outgoing light from the region of the light emitting surface 19a that is relatively far from the LED 17 is alleviated. Therefore, the display image of the liquid crystal display device 10 can be made to have high display quality without color unevenness. This problem of color unevenness tends to become more prominent as the liquid crystal display device 10 becomes larger in screen size. Therefore, by solving the problem of color unevenness with the above-described configuration, the liquid crystal display device 10 is particularly enlarged. Preferred above. Furthermore, in the present embodiment, the first reflection sheet 22 having the first region 22A and the second region 22B prevents light from being emitted from the end surface 19d adjacent to the light emitting surface 19a of the light guide member 19. Therefore, the utilization efficiency of the light emitted from the LED 17 and the luminance of the emitted light can be improved, and it is preferable for preventing color unevenness.

As described above, the backlight device (illumination device) 12 according to the present embodiment emits light incident on the end portion of the LED 17 from the LED 17 and the end portion of the LED 17 that is opposed to the LED 17. A light guide member 19 having a light emitting surface 19a to be operated, and a first light reflecting the light in the light guide member 19 while being arranged in contact with an end surface 19d which is a surface adjacent to the light emitting surface 19a of the light guide member 19 When the first reflection sheet 22 is divided into at least a first area 22A that is relatively close to the LED 17 and a second area 22B that is relatively far from the LED 17, the first area 22A is provided. Compared to the second region 22B, both the x value and the y value, which are chromaticity coordinate values in the CIE 1931 chromaticity diagram, are relatively large.

After the light incident on the end portion of the light guide member 19 from the LED 17 is reflected by the first reflection sheet 22 disposed in contact with the end surface 19d that is adjacent to the light emitting surface 19a, the light propagates through the inside. The light exits from the light exit surface 19a. Light on the short wavelength side included in the light propagating in the light guide member 19 tends to scatter and tend to be emitted to the outside as compared with light on the long wavelength side. For this reason, light emission on the short wavelength side tends to be excessive in a region relatively close to the LED 17 in the light guide member 19, and conversely, light emission on the short wavelength side is insufficient in a region relatively far from the LED 17. This tends to cause color unevenness in the light emitted from the light guide member 19.

Therefore, in the present embodiment, the x value and the y value that are the chromaticity coordinate values of the CIE 1931 chromaticity diagram relating to the first region 22A that is relatively close to the LED 17 in the first reflective sheet 22 are relatively determined from the LED 17. Both the x value and the y value related to the distant second region 22B are relatively large. According to such a configuration, the first region 22A relatively close to the LED 17 reflects more light on the long wavelength side and reduces the amount of reflected light on the short wavelength side than the second region 22B. In the region of the light guide member 19 that is relatively close to the LED 17, the emission of the long-wavelength side that tends to be short is promoted, whereas the short-wavelength side that tends to be excessive tends to be excessive. The emission of light is suppressed. On the other hand, the second region 22B that is relatively far from the LED 17 tends to reflect more light on the short wavelength side and reduce the amount of reflected light on the long wavelength side than the first region 22A. In the region of the light guide member 19 that is relatively far from the LED 17, the emission of the long wavelength light that tends to be excessive is suppressed, whereas the light of the short wavelength that tends to be insufficient is emitted. Is promoted. As described above, color unevenness that can occur between the light emitted from the region of the light guide member 19 that is relatively close to the LED 17 and the light that is emitted from the region far from the LED 17 can be reduced. This is suitable for increasing the size of the device 12. Further, in the present embodiment, the first reflection sheet 22 prevents light from being emitted from the end surface 19 d that is a surface adjacent to the light emission surface 19 a of the light guide member 19, and the first reflection sheet 22. Since the first region 22A and the second region 22B described above are included in the light, the light from the LED 17 can be efficiently used as the emitted light, the luminance can be improved, and color unevenness can be achieved. It is more suitable for prevention.

The light guide member 19 includes a light incident surface 19 b on which light from the LED 17 is incident on a surface adjacent to the light emitting surface 19 a, and the first reflective sheet 22 is formed of the light guide member 19. A surface adjacent to the light exit surface 19a is arranged over the entire area excluding the light incident surface 19b. If it does in this way, the light which injected into the light-incidence surface 19b contained in the surface adjacent to the light-projection surface 19a among the light guide members 19 from LED17 will be in the surface adjacent to the light-projection surface 19a among the light-guide members 19. By being reflected by the first reflection sheet 22 disposed over the entire area excluding the light incident surface 19b, the light is efficiently emitted from the light emitting surface 19a. As a result, the light utilization efficiency and luminance can be further improved, and it is more suitable for preventing color unevenness.

Further, the LED 17 has a light distribution in which the optical axis LA, which is the traveling direction of the light whose emission intensity reaches a peak, is parallel to the light emitting surface 19a, and the first reflective sheet 22 is in relation to the optical axis LA. It has an orthogonal plane. If it does in this way, since the light from which the light emission intensity becomes a peak among the light from LED17 can be efficiently reflected by the 1st reflective sheet 22 orthogonal to the optical axis LA which is the advancing direction. The light utilization efficiency and luminance are higher, and it is more suitable for preventing color unevenness.

Further, a second reflection sheet 23 is provided which is disposed in contact with the plate surface 19c which is the surface opposite to the light emitting surface 19a of the light guide member 19. In this way, the light from the LED 17 that has entered the light guide member 19 is guided to the first reflection sheet 22 that is in contact with the end surface 19d that is the surface of the light guide member 19 adjacent to the light exit surface 19a. After being propagated through the light guide member 19 by being reflected by the second reflection sheet 23 in contact with the plate surface 19c which is the surface opposite to the light exit surface 19a of the light member 19, the light exit surface 19a Emitted.

Further, the chromaticity coordinate value of the CIE 1931 chromaticity diagram relating to the first region 22A is set to (x1, y1), the chromaticity coordinate value of the CIE 1931 chromaticity diagram relating to the second region 22B is set to (x2, y2), and white color When the chromaticity coordinate value of the CIE1931 chromaticity diagram relating to the reference chromaticity is (x0, y0), the first region 22A and the second region 22B have a chromaticity in a relationship satisfying the following expressions (1) and (2). Each has a coordinate value.

[Equation 9]
x2 <x0 ≦ x1 (1)

[Equation 10]
y2 <y0 ≦ y1 (2)

In this way, the chromaticity of the second region 22B can be made closer to the white reference chromaticity as compared with the case where the x1 value is smaller than the x0 value and the y1 value is smaller than the y0 value. Since the light reflection efficiency in the first reflection sheet 22 becomes better as the chromaticity approaches the white reference chromaticity, the light reflection efficiency in the second region 22B becomes better, and thus the luminance of the emitted light. It is suitable for improving the above. Further, it is useful when the light emitted from the LED 17 is white light or light having a color close to it.

Further, the chromaticity coordinate value of the CIE 1931 chromaticity diagram relating to the first region 22A is set to (x1, y1), the chromaticity coordinate value of the CIE 1931 chromaticity diagram relating to the second region 22B is set to (x2, y2), and white color When the chromaticity coordinate value of the CIE1931 chromaticity diagram relating to the reference chromaticity is (x0, y0), the first region 22A and the second region 22B have chromaticities in a relationship satisfying the following expressions (3) and (4). Each has a coordinate value.

[Equation 11]
x2 ≦ x0 <x1 (3)

[Equation 12]
y2 ≦ y0 <y1 (4)

In this way, the chromaticity of the first region 22A can be made closer to the white reference chromaticity as compared with the case where the x2 value is larger than the x0 value and the y2 value is larger than the y0 value. The light reflection efficiency in the first reflection sheet 22 becomes better as the chromaticity becomes closer to the white reference chromaticity. Therefore, the light reflection efficiency in the first region 22A becomes better, and thus the luminance of the emitted light. It is suitable for improving the above. Further, it is useful when the light emitted from the LED 17 is white light or light having a color close to it.

Further, the first area 22A and the second area 22B have chromaticity coordinate values that satisfy the above-described expressions (5) and (6).

In this way, since both the first region 22A and the second region 22B have chromaticity close to the white reference chromaticity, both the light reflection efficiency in the first region 22A and the second region 22B are good. Therefore, it is more effective in improving the brightness of the emitted light. Moreover, since the color exhibited by the first region 22A and the color exhibited by the second region 22B have a complementary relationship, it is particularly useful when the emitted light from the LED 17 is white light.

In addition, the light guide member 19 has a substantially square plate shape when seen in a plan view, and its one plate surface constitutes the light emission surface 19a, whereas the first reflection sheet 22 is arranged in contact with the end surface. The first reflection sheet 22 includes a plurality of divided reflection sheets (divided reflection members) 22 S divided for each end surface 19 d corresponding to each side of the light guide member 19. In this way, when the first reflection sheet 22 is installed, the plurality of divided reflection sheets 22S may be arranged for each end surface 19d corresponding to each side of the light guide member 19, so that it temporarily spans a plurality of sides. Compared to the case where the first reflective sheet is used, the alignment with respect to the light guide member 19 is facilitated and the workability is excellent.

Further, the plurality of divided reflection sheets 22S include those in which the entire region is the first region 22A and those in which the entire region is the second region 22B. In this way, it is easier to manufacture the divided reflection sheet 22S than the case where the first area 22A and the second area 22B are mixed in one divided reflection sheet 22S, and the manufacturing cost is reduced. Can be reduced.

In addition, the first region 22A and the second region 22B have different chromaticity coordinate values in the CIE 1931 chromaticity diagram by applying paint on the surface of the first reflection sheet 22. In this case, the chromaticity in the first region 22A and the second region 22B can be set appropriately by selecting the coating range (coating area) of the coating on the surface of the first reflection sheet 22 and the type of coating. It can be.

The light guide member 19 has a substantially square shape when viewed in plan, whereas the LED 17 is opposed to a corner portion of the end portion of the light guide member 19 and its optical axis LA is guided. It is arranged to be inclined with respect to the side of the optical member 19. In this way, compared to the case where a plurality of LEDs 17 are arranged in parallel along one side of the end portion of the light guide member 19, the number of LEDs 17 can be reduced, and the optical axis LA of the LEDs 17 can be reduced. The light can be efficiently supplied into the light guide member 19 by being inclined with respect to.

Further, the LED 17 is arranged so that its optical axis LA substantially coincides with the diagonal line in the light guide member 19. In this way, light from the LED 17 reaches the corner of the light guide member 19 opposite to the LED 17 along the optical axis LA, as compared with the case where the optical axis is set to intersect the diagonal line. Since the distance to the LED 17 side of the light guide member 19 and the vicinity of the corner on the opposite side of the LED 17 in the light guide member 19 are likely to be different, the chromaticity of the emitted light is easily generated. Color unevenness of emitted light can be effectively suppressed.

Further, the light source is the LED 17. In this way, high brightness and low power consumption can be achieved.

The LED 17 includes an LED chip (LED element) that emits substantially blue monochromatic light and a phosphor that emits light when excited by light from the LED chip. In this way, the light emitted from the LED 17 contains a lot of light in the blue wavelength region. Since a large amount of light in the blue wavelength region tends to be emitted in a region relatively close to the LED 17 in the light guide member 19, there is a concern that the light is attenuated until reaching a region relatively far from the LED 17. However, the above-described configuration can effectively suppress color unevenness that may occur in the light emitted from the light guide member 19.

As mentioned above, although Embodiment 1 of this invention was shown, this invention is not restricted to the said embodiment, For example, the following modifications can also be included. In the following modifications, members similar to those in the above embodiment are denoted by the same reference numerals as those in the above embodiment, and illustration and description thereof may be omitted.

[Modification 1 of Embodiment 1]
A first modification of the first embodiment will be described with reference to FIG. Here, the chromaticity of the first region 22A is changed.

The first reflective sheet 22 (not shown) according to the present modification represents the chromaticity of the first region 22A (first divided reflective sheet 22SA) as shown in FIG. 11 which is an enlarged view of the 1931 chromaticity diagram. The point A is configured to coincide with the point W representing the white reference chromaticity. That is, the first region 22A has the same chromaticity as the light emitted from the LED 17. Specifically, the chromaticity coordinate values (x1, y1) in the first region 22A satisfy the following expressions (7) and (8). In contrast, the chromaticity coordinate values (x2, y2) in the second region 22B (second divided reflection sheet 22SB) are the chromaticity coordinate values (x1, y1) in the first region 22A and the white reference chromaticity. The chromaticity coordinate values (x0, y0) are each smaller. Therefore, when the light (white light) from the LED 17 is irradiated on the first region 22A of the first reflective sheet 22 according to this modification, the reflected light is almost white light, whereas the second region 22B When the light from the LED 17 (white light) is irradiated, the reflected light contains at least a shorter wavelength side light than the emitted light of the LED 17 and is bluish. In order to manufacture the first reflection sheet 22 having such a configuration, for example, a predetermined paint is applied only to the base material forming the second divided reflection sheet 22SB forming the second region 22B, and the first region 22A is formed. The first divided reflection sheet 22SA is not coated with a paint, and light may be reflected by the surface of the white base material.

[Equation 13]
x2 <x0 = x1 (7)
[Formula 14]
y2 <y0 = y1 (8)

[Modification 2 of Embodiment 1]
A second modification of the first embodiment will be described with reference to FIG. Here, the chromaticity of the second region 22B is changed.

The first reflective sheet 22 (not shown) according to the present modification represents the chromaticity of the second region 22B (second divided reflective sheet 22SB) as shown in FIG. 12 which is an enlarged view of the 1931 chromaticity diagram. The point B is configured to coincide with the point W representing the white reference chromaticity. In other words, the second region 22B has the same chromaticity as the light emitted from the LED 17. Specifically, the chromaticity coordinate values (x2, y2) in the second region 22B satisfy the following expressions (9) and (10). On the other hand, the chromaticity coordinate values (x1, y1) in the first region 22A (first divided reflection sheet 22SA) are the chromaticity coordinate values (x2, y2) in the second region 22B and the white reference chromaticity. The chromaticity coordinate values (x0, y0) are respectively larger. Therefore, when the light (white light) from the LED 17 is applied to the second region 22B of the first reflective sheet 22 according to the present modification, the reflected light is substantially white light, whereas the first region 22A When the light from the LED 17 (white light) is irradiated, the reflected light contains more light on the long wavelength side than at least the emitted light of the LED 17 and becomes yellowish. In order to manufacture the first reflective sheet 22 having such a configuration, for example, a predetermined paint is applied only to the base material forming the first divided reflective sheet 22SA forming the first region, and the second region 22B forming the second region 22B. The two-divided reflection sheet 22SB is not coated with a paint, and light may be reflected by the surface of the white base material.

[Equation 15]
x2 = x0 <x1 (9)
[Equation 16]
y2 = y0 <y1 (10)

[Modification 3 of Embodiment 1]
A third modification of the first embodiment will be described with reference to FIG. Here, the chromaticity of both the first area 22A and the second area 22B is changed.

As shown in FIG. 13 which is an enlarged view of the 1931 chromaticity diagram, the first reflective sheet 22 (not shown) according to this modification example has a first area 22A (first divided reflective sheet 22SA) and a second area 22B. Each chromaticity (point A, point B) in (second divided reflection sheet 22SB) is set to a chromaticity closer to yellow than the white reference chromaticity (point W). The chromaticity coordinate values of the first region 22A and the second region 22B have a relationship satisfying the following expressions (11) and (12). Specifically, the chromaticity coordinate values (x2, y2) in the second region 22B. Are smaller than the chromaticity coordinate values (x1, y1) in the first region 22A, but larger than the chromaticity coordinate values (x0, y0) in the white reference chromaticity. Therefore, when the light (white light) from the LED 17 is irradiated on the second region 22B of the first reflective sheet 22 according to the present modification, the reflected light is very light yellowish, whereas the light is reflected in the first region 22A. When the light (white light) from the LED 17 is irradiated, the reflected light is tinged with a darker yellow color than the reflected light of the second region 22B. In order to manufacture the first reflection sheet 22 having such a configuration, for example, the same paint is used for the first divided reflection sheet 22SA forming the first region 22A and the second divided reflection sheet 22SB forming the second region 22B. It is possible to apply a paint having a relatively low concentration to the second divided reflection sheet 22SB and apply a paint having a relatively high concentration to the first divided reflection sheet 22SA. Of course, different paints may be used for the first region 22A and the second region 22B.

[Equation 17]
x0 <x2 <x1 (11)
[Equation 18]
y0 <y2 <y1 (12)

[Modification 4 of Embodiment 1]
A fourth modification of the first embodiment will be described with reference to FIG. Here, what changed further the chromaticity of the 1st field 22A and the 2nd field 22B from the above-mentioned modification 3 is shown.

As shown in FIG. 14 which is an enlarged view of the 1931 chromaticity diagram, the first reflective sheet 22 (not shown) according to this modification example has a first area 22A (first divided reflective sheet 22SA) and a second area 22B. Each chromaticity (point A, point B) in (second divided reflection sheet 22SB) is set to a chromaticity closer to blue than white reference chromaticity (point W). The chromaticity coordinate values of the first region 22A and the second region 22B have a relationship satisfying the following equations (13) and (14). Specifically, the chromaticity coordinate values (x1, y1) in the first region 22A. Are larger than the chromaticity coordinate values (x2, y2) in the second region 22B, but smaller than the chromaticity coordinate values (x0, y0) in the white reference chromaticity. Therefore, when the light (white light) from the LED 17 is irradiated on the first region 22A of the first reflective sheet 22 according to this modification, the reflected light has a very light blue color, whereas the second region 22B When the light (white light) from the LED 17 is irradiated, the reflected light has a relatively dark blue color than the reflected light of the first region 22A. In order to manufacture the first reflection sheet 22 having such a configuration, for example, the same paint is used for the first divided reflection sheet 22SA forming the first region 22A and the second divided reflection sheet 22SB forming the second region 22B. It is possible to apply a paint having a relatively low concentration to the first divided reflection sheet 22SA and apply a paint having a relatively high concentration to the second divided reflection sheet 22SB. Of course, different paints may be used for the first region 22A and the second region 22B.

[Equation 19]
x2 <x1 <x0 (13)
[Equation 20]
y2 <y1 <y0 (14)

[Modification 5 of Embodiment 1]
Modification 5 of Embodiment 1 will be described with reference to FIG. Here, the chromaticity relationship of the first region 22A and the second region 22B with respect to the white reference chromaticity is changed.

The first reflective sheet 22 (not shown) according to this modification is related to the chromaticity of the first region 22A (first divided reflective sheet 22SA) as shown in FIG. 15 which is an enlarged view of the 1931 chromaticity diagram. The point W related to the white reference chromaticity does not exist on a straight line connecting the point A and the point B related to the chromaticity of the second region 22B (second divided reflection sheet 22SB). In other words, a straight line connecting the point A related to the chromaticity of the first region 22A and the point W related to the white reference chromaticity, and the point B related to the chromaticity of the second region 22B and the point related to the white reference chromaticity The straight line connecting W is not the same straight line as in the first embodiment and the modifications 1 to 4 described above, but has a relationship that intersects each other. The point A related to the chromaticity of the first region 22A is located on the right side (red side) with respect to the point W related to the white reference chromaticity in the 1931 chromaticity diagram shown in FIG. Slightly red. On the other hand, the point B related to the chromaticity of the second region 22B is located below (magenta color) near the point W related to the white reference chromaticity in the 1931 chromaticity diagram shown in FIG. The color is somewhat magenta.

[Modification 6 of Embodiment 1]
A sixth modification of the first embodiment will be described with reference to FIG. Here, a modification in which the relationship of the chromaticity of the first region 22A and the second region 22B with respect to the white reference chromaticity is further changed from the above-described modification example 5 is shown.

In the reflective sheet 21 (not shown) according to this modification, the point A related to the chromaticity of the first region 22A (first divided reflective sheet 22SA) is a white reference color in the 1931 chromaticity diagram shown in FIG. It is located on the upper side (green side) with respect to the point W related to the degree, and the color is slightly greenish. On the other hand, the point B related to the chromaticity of the second region 22B (second divided reflection sheet 22SB) is shifted to the left (cyan shift) with respect to the point W related to the white reference chromaticity in the 1931 chromaticity diagram shown in FIG. ) And has a slightly cyan color.

<Embodiment 2>
A second embodiment of the present invention will be described with reference to FIGS. In this Embodiment 2, what changed the division | segmentation aspect of each area | region in the 1st reflection sheet 122 is shown. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

As shown in FIG. 17, the first reflective sheet 122 according to the present embodiment is divided into three regions 122A to 122C having different chromaticities. Specifically, the first region 122A closest to the LED 17 and the most LED 17 The second region 122B far from the first region 122B, and the third region 22C is disposed between the first region 122A and the second region 122B and is adjacent to the second region 122B. Specifically, among the four divided reflective sheets 122S constituting the first reflective sheet 122, a pair of first divided reflective sheets 122SA arranged adjacent to the LED 17 (light incident surface 19b of the light guide member 19) is provided. While the entire area of the first area 122A and a part (half) of the third area 22C are included, the remaining pair of second divided reflection sheets 122SB includes the entire area of the second area 122B and the third area 22C. The remaining part (half). More specifically, the pair of first divided reflection sheets 122SA arranged adjacent to the LED 17 is divided into a first region 122A and a third region 22C at approximately the center position in the extending direction, respectively. The side closer to the LED 17 (X1 end side or Y1 end side) is the first region 122A, and the side relatively far from the LED 17 (X2 end side or Y2 end side) is the third region 22C. The pair of second divided reflection sheets 122SB adjacent to each other across the corner portion diagonal to the light incident surface 19b of the light guide member 19 has the second region 122B and the second region 122B at substantially the center position in the extending direction. It is divided into three regions 22C, and the side relatively close to the LED 17 (X3 end side or Y3 end side) is the third region 22C and is relatively far from the LED 17 (X4 end side or Y4 end side). Is the second region 122B. The first region 122A and the second region 122B have substantially the same area, whereas the third region 22C has an area that is the sum of the areas of the first region 122A and the second region 122B. have. Of these, the chromaticity of the third region 22C is different from the chromaticity of the first region 122A and the second region 122B, and will be described in detail below.

In the enlarged view of the 1931 chromaticity diagram shown in FIG. 18, the chromaticity in the third region 22C is represented by a point C, and this point C coincides with the point W related to the white reference chromaticity. Therefore, when the light (white light) from the LED 17 is applied to the third region 22C of the first reflective sheet 122, the reflected light is substantially white light. Specifically, the chromaticity coordinate values (x3, y3) in the third region 22C are the chromaticity coordinate values (x1, y1) in the first region 122A, the chromaticity coordinate values (x2, y2) in the second region 122B, and It has the relationship which satisfy | fills following formula (17), (18) with respect to the chromaticity coordinate value (x0, y0) in white reference | standard chromaticity. In order to manufacture the first reflective sheet 122 having such a configuration, for example, among the base material forming the first divided reflective sheet 122SA and the first divided reflective sheet 122SA, the first region 122A and the second region 122B are respectively predetermined. In contrast, the third region 22C is not coated with the paint, and the light may be reflected by the surface of the white base material. As shown in FIGS. 19 and 20, the chromaticity coordinate values in the third area 22C are substantially constant over the entire area, and the chromaticity coordinate values in the first area 122A and the second area 122B are also in the entire area. Almost constant over time.

[Equation 17]
x2 <x0 = x3 <x1 (15)
[Equation 18]
y2 <y0 = y3 <y1 (16)

As described above, according to the present embodiment, when the first reflecting sheet 122 is divided into the third region 22C adjacent to both the first region 122A and the second region 122B, the third region In the region 22C, both the x value and the y value, which are chromaticity coordinate values in the CIE 1931 chromaticity diagram, are relatively small compared to the second region 122B, and the x value and y value are relatively small compared to the first region 122A. Both are relatively large. In this way, the third region 22C adjacent to both the first region 122A and the second region 122B in the first reflective sheet 122 reflects light on the longer wavelength side compared to the first region 122A. Although the ratio of the amount of reflected light of the short wavelength side to the amount of light is relatively large, the ratio of the amount of reflected light of the short wavelength side to the amount of reflected light of the long wavelength side is relatively larger than that of the second region 122B. Tend to be smaller. That is, in the third region 22C, the ratio of the reflected light amount of the short wavelength side to the reflected light amount of the long wavelength side light is a value between the adjacent first region 122A and the second region 122B. Color unevenness is less likely to occur in the emitted light from the optical member 19.

<Embodiment 3>
A third embodiment of the present invention will be described with reference to FIGS. In the third embodiment, the chromaticity distribution in the first reflection sheet 222 is changed. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

The first reflective sheet 222 according to the present embodiment is configured such that the color of the surface changes in a gradation according to the distance from the LED 17, as shown in FIG. Specifically, as shown in FIG. 22, a large number of dots DA and DB made of paint are formed on each divided reflection sheet 222S constituting the first reflection sheet 222. 21 and 22 mainly show the first divided reflective sheet 222SA on the long side forming the first region 222A and its dots DA, but the second divided reflective sheet 222SB forming the second region 222B and The dot DB has the same configuration, and the X3 end, the Y4 end, and the dot DB are shown in parentheses in the drawing. The first region 222A (first divided reflection sheet 222SA) is coated with a first paint such that the reflected light from the application surface is yellowish, while the second region 222B (second divided reflection sheet 222SB). ) Is coated with a second paint such that the reflected light from the coated surface has a blue tint. The area of the dots DA formed in the first region 222A gradually increases in the direction approaching the LED 17 (the direction from the X2 end or Y2 end toward the X1 end or Y1 end) and conversely away from the LED 17 (The area gradually decreases in the direction from the X1 end or Y1 end toward the X2 end or Y2 end. That is, as the first region 222A approaches the LED 17, as shown in FIG. The yellowish color increases, and as it moves away from the LED 17, the yellowish color becomes lighter and has a chromaticity distribution that tends to approach white (chromaticity coordinate values x0, y0).

On the other hand, the dot DB formed in the second region 222B gradually decreases in the direction toward the LED 17 (the direction from the X4 end or the Y4 end to the X3 end or the Y3 end), and conversely, the direction away from the LED 17 The area gradually increases in the direction (from the X3 end or the Y3 end toward the X4 end or the Y4 end). That is, as shown in FIG. 24, in the second region 222B, the blueness increases as the distance from the LED 17 increases, and the blueness decreases as the distance from the LED 17 decreases to white (chromaticity coordinate values x0, y0). It has a chromaticity distribution that tends to approach. Therefore, as shown in FIGS. 23 and 24, the chromaticity coordinate values in the first region 222A and the second region 222B tend to gradually increase as the distance from the LED 17 increases, and conversely decrease as the distance from the LED 17 decreases. As described above, in the first reflective sheet 222 according to the present embodiment, the chromaticity coordinate value continuously decreases toward the direction away from the LED 17, and conversely, the chromaticity coordinate value continues toward the direction closer to the LED 17. The chromaticity distribution gradually increases. According to the first reflection sheet 222 having such a configuration, the chromaticity in the first region 222A and the second region 222B changes gently according to the distance from the LED 17, so the color unevenness of the emitted light in the light guide member 19 Can be more suitably suppressed. As a means for adjusting the chromaticity, the areas of the paint dots DA and DB may be the same, and the interval between the dots DA and DB may be changed.

As described above, according to the present embodiment, the first reflecting sheet 222 is formed with a large number of dots DA and DB made of paint. In this way, it is possible to easily control the chromaticity in the first region 222A and the second region 222B according to the modes (area, distribution density, etc.) of the dots DA and DB.

Further, the dots DA and DB are arranged so that the chromaticity coordinate values of the CIE 1931 chromaticity diagram in the first area 222A and the second area 222B become smaller in the direction away from the LED 17, respectively. In this way, since the chromaticity in the first region 222A and the second region 222B changes gently according to the distance from the LED 17, the color unevenness of the emitted light in the light guide member 19 is more suitably suppressed. Can do.

<Embodiment 4>
Embodiment 4 of the present invention will be described. In this Embodiment 4, what changed the manufacturing method of the 1st reflective sheet 22 is shown. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

The first reflective sheet 22 according to the present embodiment contains a polycyclic pigment as an organic pigment in the synthetic resin material that forms the base material. Specifically, the first divided reflection sheet 22SA that forms the first region 22A of the first reflection sheet 22 contains a yellow polycyclic pigment, whereas the second division 22B that forms the second region 22B. The divided reflection sheet 22SB contains a polycyclic pigment exhibiting a blue color. As specific polycyclic pigments exhibiting yellow, for example, isoindolinone, isoindoline, quinophthalone, pyrazolone, flavatron, anthraquinone and the like can be used. As specific polycyclic pigments exhibiting blue, for example, phthalocyanine, anthraquinone, indigoid, carbonium and the like can be used. In addition, since each chromaticity in the first region 22A and the second region 22A is the same as that in the first embodiment, overlapping description will be omitted.

As described above, according to the present embodiment, the first region 22A and the second region 22B have the chromaticity coordinate values of the CIE 1931 chromaticity diagram different from each other by containing the pigment in the first reflection sheet 22. Is done. In this way, the chromaticity in the first region 22A and the second region 22B can be appropriately selected by selecting the amount of pigment to be contained in the first reflection sheet 22 (content concentration, etc.) and the type of pigment. It can be.

<Embodiment 5>
A fifth embodiment of the present invention will be described with reference to FIG. In the fifth embodiment, the second reflecting sheet 423 in addition to the first reflecting sheet 22 is divided into two regions having different chromaticities. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

As shown in FIG. 25, the second reflective sheet 423 according to the present embodiment is divided into a first region 423A that is relatively close to the LED 17 and a second region 423B that is relatively far from the LED 17. When 423A is compared with the second region 423B, both the x value and the y value, which are chromaticity coordinate values of the CIE 1931 chromaticity diagram, are set to be relatively large. Specifically, the first region 423A and the second region 423B related to the second reflection sheet 423 are the optical axis LA of the LED 17 out of a pair of diagonal lines formed by connecting corners at diagonal positions in the second reflection sheet 423. And in other words, a diagonal line that does not pass through the LED 17 as a boundary. Note that, in FIG. 25, the first region 423A and the second region 423B having different chromaticities are illustrated in a different shaded shape for distinction. Therefore, both the first region 423A and the second region 423B have a substantially right triangle shape when seen in a plane, and the area ratios are substantially equal. The first area 423A of the second reflection sheet 423 has the same chromaticity coordinate value in the CIE 1931 chromaticity diagram as that of the first area 22A (first divided reflection sheet 22SA) of the first reflection sheet 22. . Similarly, the second area 423B of the second reflection sheet 423 has the same chromaticity coordinate value of the CIE 1931 chromaticity diagram as that of the second area 22B (second divided reflection sheet 22SB) of the first reflection sheet 22. . In addition, a paint having a different chromaticity is applied to each of the regions 423 A and 423 B of the second reflective sheet 423, similar to the first reflective sheet 22. With such a configuration, the color unevenness that may occur in the light emitted from the light guide member 19 can be more effectively reduced.

As described above, according to the present embodiment, when the second reflective sheet 423 is divided into at least the first region 423A relatively close to the LED 17 and the second region 423B relatively distant from the LED 17, the first region Compared to the

second region

423B, 423A has both x and y values that are chromaticity coordinate values of the CIE 1931 chromaticity diagram relatively large. In this manner, the second region 423 that contacts the plate surface 19c that is the surface opposite to the light exit surface 19a is also the first region 423A and the second region similar to the first reflector sheet 22 described above. 423B, the color unevenness that can occur between the light emitted from the region of the light guide member 19 that is relatively close to the LED 17 and the light that is emitted from the region far from the LED 17 is more effectively mitigated. can do.

<Embodiment 6>
A sixth embodiment of the present invention will be described with reference to FIGS. In this Embodiment 6, what changed the structure of LED517 and LED board 518 is shown. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

As shown in FIG. 26, the LED 517 and the LED substrate 518 according to this embodiment are arranged so as to face one end of the light guide member 519 on the long side. The LED substrate 518 has an elongated flat plate shape extending along the long side direction (X-axis direction) of the light guide member 519, and a plurality of LEDs 517 are intermittently arranged in parallel on the surface facing the light guide member 519. It is implemented in the form. The plurality of LEDs 517 are arranged on the LED substrate 518 with substantially equal intervals along the extending direction, and the respective optical axes almost coincide with the short side direction (Y-axis direction) of the light guide member 519. ing. The light incident surface 519 b of the light guide member 519 is configured by an end surface on the one long side facing the LED 517 and the LED substrate 518 among the outer peripheral end surfaces of the light guide member 519. Therefore, the first reflection sheet 522 has an end surface 519d excluding the light incident surface 519b in the outer peripheral end surface of the light guide member 519, specifically, one long side end surface 519d1 opposite to the light incident surface 519b, and a pair of short surfaces. They are arranged in contact with the side end face 519d2. The LED substrate 518 is attached in a state where the surface opposite to the mounting surface of the LED 517 is in contact with the inner surface of the side plate 514b on the long side of the chassis 514.

The first reflection sheet 522 will be described in detail. The divided reflection sheet 522S constituting the first reflection sheet 522 includes a pair of first divided reflection sheets 522SA that are in contact with the pair of short-side end surfaces 519d2 of the light guide member 519 and a light incident surface 519b of the light guide member 519. And a second divided reflective sheet in contact with the one long side end face 519d1 on the opposite side. Of these, the second divided reflective sheet 522SB is entirely the second area 522B (FIG. 28), whereas the first divided reflective sheet 522SA is different from the first area 522A and the first area 522A that have different chromaticities. 2 regions 522B. As shown in FIGS. 26 and 27, the first divided reflection sheet 522SA is divided into a first region 522A and a second region 522B at a substantially central position in the extending direction (Y-axis direction). The side closer to the LED 17 (Y1 end side) is the first region 522A, and the side relatively far from the LED 17 (Y2 end side, the side adjacent to the second divided reflection sheet 522SB) is the second region 522B. . In order to manufacture the first divided reflection sheet 522SA having such a configuration, for example, the first paint may be applied to half of the base material, while the second paint may be applied to the other half. In addition, since each chromaticity in 1st area | region 522A and 2nd area | region 522A is the same as that of above-mentioned Embodiment 1, it omits the overlapping description.

As described above, according to the present embodiment, the light guide member 519 has a substantially rectangular shape when viewed in plan, whereas the LED 517 includes a plurality of LEDs 517 along one side of the end portion of the light guide member 519. They are arranged in parallel. In this way, light from the plurality of LEDs 517 can be incident on the light guide member 519, which is suitable for improving the luminance of the emitted light.

<Embodiment 7>
A seventh embodiment of the present invention will be described with reference to FIGS. 29 and 30. FIG. In this Embodiment 7, what changed the division | segmentation aspect of each area | region in the 1st reflective sheet 622 from above-mentioned Embodiment 6 is shown. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 6 is abbreviate | omitted.

The first reflection sheet 622 according to the present embodiment is divided into three

regions

622A, 622B, and 622C having different chromaticities as shown in FIGS. Specifically, among the first reflective sheet 622, the second divided reflective sheet 622SB has the entire region as the second region 622B, whereas the first divided reflective sheet 622SA has the region closest to the LED 517 as the first region. The region 622A is the region farthest from the LED 517 and is the second region 622B. The region is further sandwiched between the first region 622A and the second region 622B, and the first region 622A and the second region 622B. A region adjacent to both of these is defined as a third region 622C. The first divided reflective sheet 622SA is divided into three equal parts into three

regions

622A, 622B, and 622C. In addition, since each chromaticity in each area |

region

622A, 622B, 622C is the same as that of above-mentioned Embodiment 2, it omits the overlapping description.

<Eighth embodiment>
An eighth embodiment of the present invention will be described with reference to FIG. In the eighth embodiment, the configuration of the LED 717 and the LED substrate 718 is further changed from the sixth embodiment. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1, 6 is abbreviate | omitted.

As shown in FIG. 31, the LED 717 and the LED substrate 718 according to this embodiment are arranged so as to face one end of the light guide member 719 on the short side. The LED substrate 718 has an elongated flat plate shape extending along the short side direction (Y-axis direction) of the light guide member 719, and a plurality of LEDs 717 are intermittently arranged in parallel on the surface facing the light guide member 719. It is implemented in the form. The plurality of LEDs 717 are arranged on the LED substrate 718 at substantially equal intervals along the extending direction, and the respective optical axes almost coincide with the long side direction (X-axis direction) of the light guide member 719. ing. The light incident surface 719 b of the light guide member 719 is configured by an end surface on one short side facing the LED 717 and the LED substrate 718 among the outer peripheral end surfaces of the light guide member 719. Therefore, the first reflection sheet 722 includes an end surface 719d excluding the light incident surface 719b of the outer peripheral end surface of the light guide member 719, more specifically, one short side end surface 719d2 opposite to the light incident surface 719b, and a pair of long lengths. They are arranged in contact with the side end surface 519d1. The LED substrate 718 is attached in a state where the surface opposite to the mounting surface of the LED 717 is in contact with the inner surface of the side plate 714 b on the short side of the chassis 714.

The first reflection sheet 722 will be described in detail. The divided reflection sheet 722 S constituting the first reflection sheet 722 includes a pair of first divided reflection sheets 722 SA that are in contact with the pair of long-side end surfaces 719 d 1 of the light guide member 719 and a light incident surface 719 b of the light guide member 719. And a second divided reflective sheet in contact with the one short side end face 719d2 on the opposite side. Of these, the second divided reflective sheet 722SB is entirely the second area 722B, whereas the first divided reflective sheet 722SA is a first area 722A and a second area 722B having different chromaticities. Have both. The first divided reflection sheet 722SA is divided into a first region 722A and a second region 722B at a substantially central position in the extending direction (X-axis direction), and is relatively close to the LED 17 (X1 end side). ) Is the first region 722A, and the side relatively far from the LED 17 (X2 end side, the side adjacent to the second divided reflection sheet 722SB) is the second region 722B. In addition, since each chromaticity in 1st area | region 722A and 2nd area | region 722A is the same as that of above-mentioned Embodiment 1, 6, it abbreviate | omits about the overlapping description.

As described above, according to the present embodiment, the light guide member 719 has a substantially rectangular shape when viewed in plan, whereas the LED 717 is along one short side of the end portion of the light guide member 719. A plurality of the optical axes are arranged in parallel, and the optical axes thereof are substantially aligned with the long sides. In this way, the distance until the light from the LED 717 reaches the short side of the light guide member 719 opposite to the LED 717 along the optical axis is equal to the long side of the light guide member 719. Although the difference in chromaticity of the emitted light is likely to occur between the short side of the light member 719 on the LED 717 side and the short side on the opposite side of the LED 717, the above-described configuration effectively eliminates uneven color of the emitted light. Can be suppressed.

<Ninth Embodiment>
A ninth embodiment of the present invention will be described with reference to FIG. In the ninth embodiment, a configuration in which the division mode of each region in the first reflective sheet 822 is changed from the eighth embodiment described above. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 8 is abbreviate | omitted.

The first reflection sheet 822 according to the present embodiment is divided into three

regions

822A, 822B, and 822C having different chromaticities as shown in FIG. Specifically, among the first reflective sheet 822, the second divided reflective sheet 822SB has the entire area as the second area 822B, whereas the first divided reflective sheet 822SA has the area closest to the LED 717 as the first area. The region 822A is the region farthest from the LED 717 and is the second region 822B. The region is further sandwiched between the first region 822A and the second region 822B, and the first region 822A and the second region 822B. A region adjacent to both of these is defined as a third region 822C. The first divided reflection sheet 822SA is divided into three equal parts into three

regions

822A, 822B, and 822C. In addition, since each chromaticity in each area |

region

822A, 822B, and 822C is the same as that of

Embodiment

2 and 7 mentioned above, the overlapping description is omitted.

<Embodiment 10>
A tenth embodiment of the present invention will be described with reference to FIG. In the tenth embodiment, the first reflection sheet 922 is configured as one component. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

33. As shown in FIG. 33, the first reflection sheet 922 according to this embodiment has a size that surrounds the entire end surface 19d of the light guide member 19 excluding the light incident surface 19b. That is, the first reflection sheet 922 has a band shape in which the length dimension of the pair of long side end faces 19d1 and the length dimension of the pair of short side end faces 19d2 in the light guide member 19 are added. Thus, the end surface 19d is surrounded over the entire circumference while straddling the corners existing between the adjacent end surfaces 19d1, 19d2. In order to manufacture the first reflective sheet 922 having such a configuration, for example, among the base material forming the first reflective sheet 922, a range corresponding to the length dimension of the long side end surface 19d1 from one end and a short side from the other end What is necessary is just to apply | coat the range for the length dimension of the side end surface 19d2 with a 1st coating material, and apply | coat the remaining area | region with a 2nd coating material. Accordingly, a portion of the first reflection sheet 922 that is in contact with the long-side end surface 19d1 and the short-side end surface 19d2 adjacent to each other across the light incident surface 19b in the light guide member 19 is defined as a first region 922A, and the light guide member In FIG. 19, the second region 922B can be a portion that is in contact with the long-side end surface 19d1 and the short-side end surface 19d2 that are adjacent to each other across the corner that is diagonal to the light incident surface 19b.

<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 each of the above-described embodiments, the LED as the light source is illustrated as being disposed at a position that is asymmetric with respect to the reflective sheet (light guide member, chassis, etc.). It is also possible to adopt a configuration in which they are arranged at symmetrical positions. Specifically, as a further modification of the above-described first embodiment, as shown in FIG. 34, a pair of LEDs 17-1 are arranged corresponding to a pair of diagonal corners in the light guide member 19-1. can do. In this case, the divided reflection sheet 22 constituting the first reflection sheet 22-1 may be configured to have both the first region 22A-1 and the second region 22B-1, respectively, as shown in FIGS. The side relatively closer to the LED 17-1 (X1 end side or Y1 end side) is the first region 22A-1, and the side relatively far from the LED 17-1 (X2 end side or Y2 end side) is the second region. What is necessary is just 22B-1. Note that the above-described configuration can be similarly applied to the configurations described in the above-described Embodiments 2 to 10.

(2) As a modified example of the above-described sixth embodiment, a divided reflection sheet having both the first area and the second area having different chromaticities may be further divided for each area. Specifically, as shown in FIG. 36, the first divided reflection sheet 522SA-2 in contact with the pair of short-side end faces 19d2-2 of the light guide member 19-2 is further divided into two, and the LED 17- The division part closer to 2 may be the first area 522A-2, and the division part relatively far from the LED 17-2 may be the second area 522B-2. The above-described configuration can be similarly applied to

Embodiments

2, 7 to 9, and (1). In particular, when applied to the seventh and ninth embodiments, the divided reflective sheet may be divided into three.

(3) In Embodiment 3 described above, the mode in which the chromaticity in the first reflecting sheet continuously and gradually changes is illustrated, but the mode of change in chromaticity can be changed as appropriate. Specifically, as shown in FIG. 37, the chromaticity of the first reflective sheet is changed in a stepwise manner, and the design is such that the chromaticity coordinate value decreases stepwise as the distance from the LED increases. Is possible.

(4) In the above-described third embodiment, when the first reflective sheet is divided into the first region and the second region, the chromaticity is continuously and gradually changed. However, the chromaticity is continuously and gradually changed. In addition to the changing first region and second region, a configuration having a third region is also possible. Specifically, as shown in FIG. 38, the chromaticity is constant between the first region 22A-4 and the second region 22B-4 where the chromaticity continuously and gradually changes according to the distance from the LED. The third region 22C-4 having the chromaticity coordinate value (x3, y3) that is the same as the chromaticity coordinate value (x0, y0) related to the white reference chromaticity may be interposed.

(5) In the above-described

Embodiments

2, 7, 9 and (4), the first reflective sheet is divided into three regions having different chromaticities, and the chromaticity of the third region is white. Although the example in which the reference chromaticity is equal is illustrated, the chromaticity of the third region may be designed differently from the white reference chromaticity. Specifically, as shown in FIG. 39, the design is such that the point C related to the chromaticity of the third region is interposed between the white reference chromaticity and the point A related to the chromaticity of the first region ( It is possible to use a chromaticity closer to yellow. Furthermore, as shown in FIG. 40, the design is such that the point C related to the chromaticity of the third region is interposed between the white reference chromaticity and the point B related to the chromaticity of the second region (blue It is also possible to use a chromaticity design.

(6) It is of course possible to combine the configuration of (5) described above with the configurations described in the first to sixth modifications of the first embodiment.

(7) The configurations described in the third and fourth embodiments may be applied to the configurations described in the second and fifth to tenth embodiments.

(8) The configurations described in the first to sixth modifications of the first embodiment may be applied to the configurations described in the sixth to tenth embodiments.

(9) In each of the embodiments described above, when the white reference chromaticity is the chromaticity related to the light emitted from the LED used in the backlight device, and the chromaticity coordinate value is (0.272, 0.277) However, the white reference chromaticity can be appropriately changed in addition to the above. Specifically, as white reference chromaticity, for example, D65 light source (0.3157, 0.3290), A light source (0.4476, 0.4074), B light source (0.3484, 0.3516), C Light source (0.3101, 0.3161), white reference chromaticity according to CIE color system (0.3333, 0.3333), white reference chromaticity according to NTSC standard (0.3100, 0.3160) It is also possible to use white reference chromaticity (0.3127, 0.3290) according to the Adobe とする RGB standard.

(10) Besides the above-described embodiments, the relative positional relationship of the chromaticities of the first region and the second region with respect to the white reference chromaticity in the CIE 1931 chromaticity diagram can be changed as appropriate. For example, the chromaticity of the first region can be designed to be closer to cyan or magenta with respect to the white reference chromaticity. In addition, the chromaticity of the second region can be designed to be closer to green or red with respect to the white reference chromaticity.

(11) In the above-described

Embodiments

2, 7, 9 and (4) and (5), the chromaticity of the third region is equal to the white reference chromaticity, or blue with respect to the white reference chromaticity The chromaticity of the third region is shown as being closer to red or green, closer to red, green, cyan or magenta than the white reference chromaticity. can do.

(12) Regarding the design of chromaticity of each region in the reflective sheet described in each of the above embodiments and (10) and (11), specifically, the chromaticity of the emitted light of the LED included in the backlight device. What is necessary is just to respond. That is, when the chromaticity of the LED included in the backlight device is deviated from the white reference chromaticity, for example, when the chromaticity of the LED is close to yellow, the reflection described in the first modification of the first embodiment is performed. When the chromaticity design of the sheet is preferable and the chromaticity of the LED is close to blue, it can be said that the chromaticity design of the reflective sheet described in the second modification of the first embodiment is preferable.

(13) In Embodiments 1 to 3 and 5 to 9 described above, the case where two types of paints are used to adjust the chromaticity of the reflection sheet has been described. For example, only one type of paint is used, and The chromaticity of the first region and the second region may be made different by making the concentration of the paint, the coating area, the coating film thickness, etc. different between the first region and the second region. It is also possible to use three or more kinds of paints.

(14) In Embodiment 4 described above, the case where a polycyclic pigment is used as the organic pigment used in the reflective sheet is exemplified, but an azo pigment can also be used. In addition to organic pigments, inorganic pigments and lake pigments can also be used.

(15) In each of the above-described embodiments, when adjusting the chromaticity of the reflection sheet, a case where a paint is applied to the surface of the base material of the reflection sheet or a pigment is contained in the base material of the reflection sheet is shown. For example, a laminate sheet, which is a separate part, is attached to the base of the reflective sheet, and the chromaticity of the reflective sheet is adjusted by applying a paint or adding a pigment to the laminate sheet. It doesn't matter.

(16) In each of the embodiments described above, the configuration in which the first reflective sheet has a surface orthogonal to the optical axis of the LED is exemplified, but the surface of the first reflective sheet is acute or obtuse with respect to the optical axis of the LED. The present invention can also be applied to a configuration that is inclined (intersected) to form

(17) In Embodiment 5 described above, the first region and the second region of the second reflecting sheet that are in contact with the plate surface opposite to the light emitting surface of the light guide member are the first region of the first reflecting sheet and the second region. Although the thing of the structure which has the same chromaticity coordinate value as a 2nd area | region was illustrated, either one or both of the 1st area | region and 2nd area | region of a 2nd reflective sheet are the 1st area | region of a 1st reflective sheet, and It is also possible to set a different chromaticity coordinate value from either one or both of the second regions.

(18) In Embodiment 5 described above, the second reflection sheet in contact with the plate surface opposite to the light emitting surface of the light guide member has the first region and the second region having different chromaticities. Although illustrated, applying the configuration described in the above-described

Embodiments

2, 7, 9 and (4), (5), the second reflective sheet has the third region in addition to the first region and the second region. It is also possible to have a configuration. The specific configurations of the first region and the second region of the second reflective sheet can be applied to the above-described modifications of the first embodiment and the configurations described in the second to tenth embodiments. .

(19) In each of the above-described embodiments, the case where the second reflection sheet in contact with the plate surface opposite to the light emitting surface of the light guide member is exemplified, but the second reflection sheet may be omitted. It is.

(20) In each of the above-described embodiments, the case where an LED having a biased light distribution is used is shown, but it is of course possible to use an LED having a broad light distribution.

(21) In each of the above-described embodiments, the color filters of the color filter included in the liquid crystal panel are exemplified by three colors R, G, and B. However, the color parts may be four or more colors.

(22) In each of the above-described embodiments, the case where an LED chip that emits blue light in a single color and a type of LED that emits substantially white light with a phosphor is used has been described, but ultraviolet light (blue-violet light) is monochromatic. The present invention also includes an LED chip that incorporates an LED chip that emits light and that emits substantially white light using a phosphor.

(23) In each of the above-described embodiments, the case where an LED chip that emits blue light in a single color and a type of LED that emits substantially white light with a phosphor is used has been described. What uses the LED of the type which incorporated three types of LED chips which light-emit is also contained in this invention. In addition, the present invention includes an LED using a type of LED in which three types of LED chips each emitting C (cyan), M (magenta), and Y (yellow) are monochromatic.

(24) In each of the above-described embodiments, the case where an LED is used as the light source has been described. However, it is of course possible to use other types of light sources (cold cathode tube, hot cathode tube, organic EL, etc.).

(25) In each of the embodiments described above, the TFT is used as the switching element of the liquid crystal display device. However, the present invention can be applied to a liquid crystal display device using a switching element other than the TFT (for example, a thin film diode (TFD)). In addition to the liquid crystal display device for display, the present invention can also be applied to a liquid crystal display device for monochrome display.

(26) In each of the above-described embodiments, the liquid crystal display device using the liquid crystal panel as the display panel has been exemplified. However, the present invention can be applied to display devices using other types of display panels.

(27) In each of the above-described embodiments, the television receiver provided with the tuner substrate is exemplified, but the present invention is also applicable to a display device that does not include the tuner substrate.

DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12 ... Backlight device (illumination device), 17,517,717 ... LED (light source), 19,519,719 ... Light guide member, 19a ... Light exit surface, 19b, 519b, 719b ... Light incident surface, 19c ... Plate surface (surface opposite to the light exit surface), 19d, 519d, 719d ... End surface (surface adjacent to the light exit surface), 22 , 122, 222, 522, 622, 722, 822, 922... First reflective sheet (reflective member), 22A, 122A, 222A, 522A, 622A, 722A, 822A, 922A,..., First region, 22B, 122B, 222B, 522B, 622B, 722B, 822B, 922B ... 2nd area, 22C, 622C, 822C ... 3rd area, 22S, 122S, 222S,

522S

622S, 722S, 822S ... split reflective sheet (split reflective member), 23, 423 ... second reflective sheet, 423A ... first region, 423B ... second region, DA, DB ... dot, LA ... optical axis, TV ... TV Receiver

Claims

A light source;
A light guide member having a light exit surface that emits light incident on the end portion from the light source, the end portion being arranged opposite to the light source;
A reflective member that is disposed in contact with a surface adjacent to the light emitting surface of the light guide member and reflects light in the light guide member;
When the reflective member is divided into at least a first region relatively close to the light source and a second region relatively far from the light source, the first region has CIE 1931 chromaticity as compared to the second region. The illuminating device in which both x value and y value which are chromaticity coordinate values in the figure are relatively large.
The surface adjacent to the light emitting surface of the light guide member includes a light incident surface on which light from the light source is incident,
The illuminating device according to claim 1, wherein the reflecting member is disposed over the entire area of the light guide member adjacent to the light emitting surface, excluding the light incident surface.
The light source has a light distribution in which an optical axis which is a traveling direction of light having a peak emission intensity is parallel to the light exit surface,
The lighting device according to claim 1, wherein the reflecting member has a surface orthogonal to the optical axis.
The lighting device according to any one of claims 1 to 3, further comprising a second reflecting member disposed in contact with a surface of the light guide member opposite to the light emitting surface.
When the second reflecting member is divided into at least a first region relatively close to the light source and a second region relatively far from the light source, the first region is CIE 1931 compared to the second region. The lighting device according to claim 4, wherein both the x value and the y value, which are chromaticity coordinate values in the chromaticity diagram, are relatively large.
The chromaticity coordinate value of the CIE1931 chromaticity diagram for the first area is (x1, y1), the chromaticity coordinate value of the CIE1931 chromaticity diagram for the second area is (x2, y2), and a white reference color When the chromaticity coordinate value of the CIE1931 chromaticity diagram relating to the degree is (x0, y0), the first region and the second region have a relationship of chromaticity coordinate values satisfying the following expressions (1) and (2): The lighting device according to any one of claims 1 to 5, wherein
[Equation 1]
x2 <x0 ≦ x1 (1)
[Equation 2]
y2 <y0 ≦ y1 (2)
The chromaticity coordinate value of the CIE1931 chromaticity diagram for the first area is (x1, y1), the chromaticity coordinate value of the CIE1931 chromaticity diagram for the second area is (x2, y2), and a white reference color When the chromaticity coordinate value of the CIE1931 chromaticity diagram relating to the degree is (x0, y0), the first region and the second region have a relationship of chromaticity coordinate values satisfying the following expressions (3) and (4): The lighting device according to any one of claims 1 to 5, wherein
[Equation 3]
x2 ≦ x0 <x1 (3)
[Equation 4]
y2 ≦ y0 <y1 (4)
The lighting device according to claim 6 or 7, wherein the first region and the second region have chromaticity coordinate values having a relationship satisfying the following expressions (5) and (6).
[Equation 5]
x2 <x0 <x1 (5)
[Equation 6]
y2 <y0 <y1 (6)
When the reflective member is divided into the third region adjacent to both the first region and the second region in addition to the first region, the third region has CIE 1931 chromaticity as compared with the second region. The x value and the y value, which are chromaticity coordinate values in the figure, are both relatively small, and both the x value and the y value are relatively large compared to the first region. The lighting device according to claim 8.
The light guide member has a substantially square plate shape when seen in a plane, and the one plate surface constitutes the light emitting surface, whereas the reflection member is arranged in contact with the end surface,
The lighting device according to any one of claims 1 to 9, wherein the reflection member includes a plurality of divided reflection members divided for each of the end surfaces corresponding to the sides of the light guide member.
The lighting device according to claim 10, wherein the plurality of divided reflection members include one in which the entire region is the first region and one in which the entire region is the second region.
The chromaticity coordinate values of the CIE1931 chromaticity diagram are different from each other in the first region and the second region by applying paint on the surface of the reflecting member. The lighting device according to claim 1.
The lighting device according to claim 12, wherein the reflecting member is formed with a large number of dots made of the paint.
14. The illumination device according to claim 13, wherein the dots are arranged such that chromaticity coordinate values of a CIE1931 chromaticity diagram in the first region and the second region become smaller in a direction away from the light source.
The chromaticity coordinate values of the CIE1931 chromaticity diagram are different from each other in the first region and the second region by including a pigment in the reflecting member. The lighting device described in 1.
The light guide member has a substantially square shape when viewed in plan, whereas the light source is opposed to a corner portion of the end portion of the light guide member and its optical axis is the light guide. The lighting device according to any one of claims 1 to 15, wherein the lighting device is arranged to be inclined with respect to a side of the member.
The lighting device according to claim 16, wherein the light source is arranged so that an optical axis thereof substantially coincides with a diagonal line of the light guide member.
The light guide member has a substantially square shape when seen in a plan view, whereas the light source is arranged in parallel along one side of the end portion of the light guide member. The lighting device according to claim 15.
The light guide member has a substantially rectangular shape when seen in a plan view, whereas the light source has a plurality of light sources arranged in parallel along one short side of the end portion of the light guide member and each optical axis is long. The lighting device according to claim 18, wherein the lighting device is arranged so as to substantially coincide with the side.
The lighting device according to any one of claims 1 to 19, wherein the light source is an LED.
21. The illumination device according to claim 20, wherein the LED is composed of an LED element that emits substantially blue monochromatic light and a phosphor that emits light when excited by light from the LED element.
A display device comprising: the illumination device according to any one of claims 1 to 21; and a display panel that performs display using light from the illumination device.
The display device according to claim 22, wherein the display panel is a liquid crystal panel in which liquid crystal is sealed between a pair of substrates.
A television receiver comprising the display device according to claim 22 or 23.