WO2012096204A1

WO2012096204A1 - Illumination device and display device

Info

Publication number: WO2012096204A1
Application number: PCT/JP2012/050067
Authority: WO
Inventors: 真之助野澤
Original assignee: シャープ株式会社
Priority date: 2011-01-12
Filing date: 2012-01-05
Publication date: 2012-07-19

Abstract

Provided is an illumination device that is able to suppress the occurrence of brightness unevenness in an illuminated member. The backlight device (illumination device) (3) is provided with: a plurality of LED packages (4); and a plurality of lens members (6) that are provided respectively corresponding to the plurality of LED packages and that increase the divergence angle of the light radiated from the LED packages. The lens members are disposed in a manner so as to be oblique with respect to the LED packages.

Description

Illumination device and display device

The present invention relates to an illuminating device and a display device, and more particularly to an illuminating device and a display device including a light source and a lens member that increases a spread angle of light emitted from the light source.

Conventionally, an illumination device including a light source and a lens member that increases a spread angle of light emitted from the light source is known.

FIG. 17 is a cross-sectional view showing the structure of a conventional lighting device including an LED (light source) and a lens member. 18 is a cross-sectional view showing the LED and lens member of FIG. As shown in FIG. 17, an illumination device 1001 according to a conventional example includes a plurality of LEDs (Light Emitting Diodes) 1002 that function as light sources, and a lens member that is disposed on the LED 1002 and increases the spread angle of light emitted from the LED 1002. 1003, a mounting substrate 1004 to which the LED 1002 is attached, an optical sheet 1005 into which light emitted from the LED 1002 (lens member 1003) is incident, and a chassis 1006 that houses the LED 1002, the lens member 1003, and the like.

In this illumination device 1001, as shown in FIG. 18, the lens member 1003 is arranged so that the central axis (optical axis) O1001 of the lens member 1003 is perpendicular to the surface of the mounting substrate 1004. That is, the lens member 1003 is disposed so that the central axis O1001 of the lens member 1003 coincides with the central axis (optical axis) of the LED 1002.

In the illumination device 1001, the lens member 1003 that increases the spread angle of the light emitted from the LED 1002 is provided on the LED 1002, so that the light emitted from the LED 1002 is diffused by the lens member 1003 and is not shown. It progresses to the panel (illuminated member) side. For this reason, it is possible to suppress the occurrence of uneven brightness on the display panel (not shown) to some extent.

Note that, as described above, an illumination device including an LED and a lens member disposed on the LED is disclosed in, for example, Patent Document 1.

JP 2009-192915 A

However, even when a lens member 1003 that increases the spread angle of light emitted from the LED 1002 is provided as in the illumination device 1001 shown in FIG. 17, it is difficult to sufficiently diffuse the light. For this reason, the brightness | luminance of the part corresponding to the part between LED1002, for example among the display panels (illuminated member) becomes low, and a lattice-like brightness nonuniformity (grid-like dark part) may generate | occur | produce in a display panel. There is a problem that there is.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an illuminating device and a display device capable of suppressing occurrence of luminance unevenness in an illuminated member. It is to be.

In order to achieve the above object, an illumination device according to a first aspect of the present invention includes a plurality of light sources and a plurality of light sources provided corresponding to each of the plurality of light sources, and increasing a spread angle of light emitted from the light sources. A lens member, and at least one of the lens members is disposed to be inclined with respect to the light source.

In the illumination device according to the first aspect, as described above, by arranging at least one of the lens members so as to be inclined with respect to the light source, it is possible to control how the light emitted from the light source spreads. . Thereby, it can suppress that the brightness | luminance of the predetermined part (for example, part corresponding to the part between light sources) of a to-be-illuminated member becomes low. As a result, it is possible to suppress the occurrence of luminance unevenness in the illuminated member.

And in the illuminating device by 1st aspect, since it can suppress that a brightness nonuniformity generate | occur | produces in a to-be-illuminated member, the thickness of an illuminating device is reduced or the space | interval of a light source is enlarged (the number of light sources is reduced). can do.

In the illuminating device according to the first aspect, preferably, at least one of the lens members is arranged so that the central axis of the lens member is inclined to a predetermined position side with respect to the central axis of the light source. If comprised in this way, the light radiate | emitted from the light source can be easily advanced to the predetermined position side. Thereby, since it can suppress that a part with a low brightness | luminance generate | occur | produces in the area | region including the predetermined position (position corresponding to the predetermined position of an illuminating device) among to-be-illuminated members, it is brightness | luminance to an to-be-illuminated member. Generation of unevenness can be suppressed.

In the illuminating device according to the first aspect, preferably, at least one of the lens members is arranged such that the central axis of the lens member is inclined inward of the illuminating device with respect to the central axis of the light source. If comprised in this way, the light radiate | emitted from the light source can be easily advanced to the inner side of an illuminating device. As a result, it is possible to suppress the occurrence of a low-luminance portion in the inner region of the illuminated member, so that, for example, a grid-like luminance unevenness (lattice dark portion) occurs in the illuminated member. Can be suppressed.

In this case, it is preferable that the plurality of light sources and the plurality of lens members are arranged in a predetermined direction, and the lens members at least at both ends in the arrangement direction of the plurality of lens members have the central axis of the lens member as the light source. It is arrange | positioned so that it may incline inside an illuminating device with respect to the center axis | shaft. If comprised in this way, it can suppress that a brightness | luminance becomes low in the part corresponding to the part between all the light sources arranged in the predetermined direction among the to-be-illuminated members. That is, it is possible to further suppress the occurrence of, for example, grid-like luminance unevenness in the illuminated member.

In the illuminating device according to the first aspect, preferably, at least one of the lens members is arranged such that the central axis of the lens member is inclined outward of the illuminating device with respect to the central axis of the light source. If comprised in this way, the light radiate | emitted from the light source can be easily advanced to the outer side of an illuminating device. Thereby, since it can suppress that a part with a low brightness | luminance generate | occur | produces in the area | region outside a to-be-illuminated member, for example, a frame-shaped brightness nonuniformity (frame-shaped dark part) generate | occur | produces in a to-be-illuminated member. Can be suppressed.

In this case, it is preferable that the plurality of light sources and the plurality of lens members are arranged in a predetermined direction, and the lens members at least at both ends in the arrangement direction of the plurality of lens members have the central axis of the lens member as the light source. It is arrange | positioned so that it may incline outside of an illuminating device with respect to the center axis | shaft. If comprised in this way, since it can suppress effectively that a part with a low brightness | luminance generate | occur | produces in the area | region outside a to-be-illuminated member, for example, a frame-shaped brightness nonuniformity will generate | occur | produce in a to-be-illuminated member. Can be effectively suppressed.

In the illumination device according to the first aspect, preferably, the lens member disposed in the outer peripheral portion of the plurality of lens members is compared with the lens member disposed in the central portion of the plurality of lens members. The inclination angle with respect to the light source is large. If comprised in this way, since it can suppress that a brightness nonuniformity generate | occur | produces in a to-be-illuminated member, suppressing the brightness | luminance of the center part of an to-be-illuminated member becoming low, it is effective.

In this case, it is preferable that the inclination angle of the lens member with respect to the light source gradually increases from the center to the outer periphery of the lighting device. If comprised in this way, since the spreading | diffusion method of the light radiate | emitted from the light source can be changed gradually toward the outer peripheral part from the center part of an illuminating device, it suppresses more that a brightness nonuniformity generate | occur | produces in a to-be-illuminated member. can do.

The illumination device according to the first aspect preferably further includes a mounting substrate to which a light source is attached, and the lens member is attached to the mounting substrate. With this configuration, it is not necessary to align the light source and the lens member after the lens member is attached to the mounting substrate, so that the assembly process of the lighting device can be suppressed from becoming complicated. Moreover, it can suppress that a lens member shifts position with respect to a light source.

In the illumination device including the mounting board, preferably, the mounting board has a mounting surface to which a light source is attached, and at least one of the lens members is inclined with respect to the mounting surface of the mounting board. So that it is arranged. If comprised in this way, at least 1 of a lens member can be arrange | positioned so that it may incline with respect to a light source easily.

In this case, preferably, at least one of the lens members is attached to the mounting substrate by a plurality of adhesive layers having different thicknesses. If comprised in this way, at least 1 of a lens member can be easily arrange | positioned so that the central axis of a lens member may incline with respect to the mounting surface of a mounting board.

Further, the lens member can be arranged to be inclined with respect to the light source only by providing a plurality of adhesive layers having different thicknesses. Thereby, even if it is a case where the spreading method of light is controlled for every light source, it is not necessary to form a lens member in a different shape for every light source. For this reason, it can suppress easily that a brightness nonuniformity generate | occur | produces in a to-be-illuminated member, suppressing an increase in a number of parts and cost.

In the illumination device according to the first aspect, preferably, the light source includes a light emitting diode. Thus, when a light emitting diode is used as a light source, luminance unevenness is likely to occur in a member to be illuminated. Therefore, it is particularly effective to apply the present invention when using a light emitting diode as a light source.

The lighting device according to the first aspect is preferably a direct lighting device. The direct illumination device is more likely to cause uneven brightness in the illuminated member than the edge light (side light) illumination device. For this reason, it is particularly effective to apply the present invention when using a direct illumination device.

In the direct type illumination device, preferably, a diffusion plate having a function of diffusing light from the lens member, a function of collecting the light transmitted through the diffusion plate, and a function of diffusing the light transmitted through the diffusion plate And an optical sheet having at least one of the functions. If comprised in this way, when the optical sheet has a function which condenses the light which permeate | transmitted the diffuser plate, the brightness | luminance of the front direction of a to-be-illuminated member can be improved. Moreover, when the optical sheet has a function of diffusing the light transmitted through the diffusion plate, it is possible to further suppress the occurrence of luminance unevenness in the illuminated member.

The lighting device according to the first aspect is preferably an edge light type lighting device. In the edge light type illumination device, for example, spot-like (circular or elliptical) luminance unevenness (spot-like bright part) is likely to occur in the vicinity of the light source in the illuminated member. However, since the lighting device according to the first aspect can control how the light emitted from the light source spreads, when using an edge light type lighting device, a portion near the light source among the members to be illuminated. In addition, for example, occurrence of spot-like luminance unevenness can be easily suppressed.

In the edge light type illumination device, preferably, a light guide plate having a function of guiding light from the lens member, a function of collecting light transmitted through the light guide plate, and diffusing light transmitted through the light guide plate And an optical sheet having at least one of the functions. If comprised in this way, when the optical sheet has a function which condenses the light which permeate | transmitted the light-guide plate, the brightness | luminance of the front direction of a to-be-illuminated member can be improved. In addition, when the optical sheet has a function of diffusing light transmitted through the light guide plate, it is possible to further suppress the occurrence of luminance unevenness in the illuminated member.

In the illumination device according to the first aspect, each of the light sources includes one or more light emitting units, and at least one of the lens members has a central axis of the lens member with respect to a central axis of the one or more light emitting units. You may arrange | position so that it may incline.

A display device according to a second aspect of the present invention includes the illumination device configured as described above and a display panel illuminated by the illumination device. If comprised in this way, the display apparatus which can suppress that a brightness nonuniformity generate | occur | produces in a to-be-illuminated member can be obtained.

As described above, according to the present invention, it is possible to easily obtain an illuminating device and a display device capable of suppressing occurrence of luminance unevenness in a member to be illuminated.

1 is a cross-sectional view illustrating a structure of a liquid crystal display device according to a first embodiment of the present invention. It is the top view which showed the LED package and lens member of FIG. It is the expanded sectional view which showed the structure of the LED package of FIG. 1, and a lens member. FIG. 3 is a cross-sectional view taken along line 100-100 in FIG. FIG. 3 is a cross-sectional view taken along line 150-150 in FIG. It is the expanded sectional view which showed the state arrange | positioned so that the center axis | shaft of a lens member may correspond with the center axis | shaft of a LED package. It is sectional drawing which showed the LED package and lens member of the liquid crystal display device by 2nd Embodiment of this invention. It is sectional drawing which showed the LED package and lens member of the liquid crystal display device by 2nd Embodiment of this invention. It is the top view which showed the LED package and lens member of the liquid crystal display device by 3rd Embodiment of this invention. FIG. 10 is a cross-sectional view taken along line 200-200 in FIG. 9. FIG. 6 is a cross-sectional view illustrating a structure of a liquid crystal display device according to a fourth embodiment of the present invention. It is the top view which showed the LED package and lens member of FIG. It is the top view which showed the structure of the LED package and lens member of the backlight apparatus by the 1st modification of this invention. It is the expanded sectional view which showed the LED package and light emitting element of FIG. It is the top view which showed the structure of the LED package and lens member of the backlight apparatus by the 2nd modification of this invention. FIG. 16 is an enlarged cross-sectional view illustrating the LED package and the light emitting element of FIG. 15. It is sectional drawing which showed the structure of the illuminating device by a conventional example provided with LED and the lens member. It is sectional drawing which showed LED and the lens member of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In order to facilitate understanding, even a cross-sectional view may not be hatched.

(First embodiment)
First, the structure of the liquid crystal display device 1 according to the first embodiment of the invention will be described with reference to FIGS.

The liquid crystal display device 1 according to the first embodiment of the present invention constitutes, for example, a liquid crystal television receiver (not shown). As shown in FIG. 1, the liquid crystal display device 1 includes a liquid crystal display panel 2 and a backlight device 3 that is disposed on the lower side (back side) of the liquid crystal display panel 2 and illuminates the liquid crystal display panel 2. Has been. The liquid crystal display device 1 is an example of the “display device” in the present invention, and the liquid crystal display panel 2 is an example of the “display panel” in the present invention. The backlight device 3 is an example of the “illumination device” in the present invention.

The liquid crystal display panel 2 includes two glass substrates that sandwich a liquid crystal layer (not shown). The liquid crystal display panel 2 functions as a display panel when illuminated by the backlight device 3.

Here, in the first embodiment, the backlight device 3 is a direct-type backlight device, and includes a plurality of LED packages 4 functioning as point light sources, and a mounting substrate 5 having a mounting surface 5a to which the LED packages 4 are attached. A plurality of lens members 6 provided corresponding to each of the plurality of LED packages 4, a reflection member 7 disposed on the mounting substrate 5, and the lens member 6 and the liquid crystal display panel 2. A diffusing plate 8 and an optical sheet 9 and a backlight chassis 10 for housing the LED package 4 and the reflecting member 7 are included. The LED package 4 is an example of the “light source” and “light emitting diode” in the present invention.

The plurality of LED packages 4 are arranged in the longitudinal direction (A direction) and the lateral direction (B direction) of the liquid crystal display panel 2 (see FIG. 1), as shown in FIG. Each of the LED packages 4 includes a light emitting element 4a as shown in FIG. For example, in the first embodiment, the LED package 4 is configured to include one light emitting element 4a that emits blue light and a phosphor (not shown) that converts part of the blue light into yellow light. ing. The light emitting element 4a is an example of the “light emitting part” in the present invention. The A direction and the B direction are examples of the “predetermined direction” and the “arrangement direction” in the present invention.

The LED package 4 is attached to the mounting surface 5a of the mounting substrate 5 using a solder layer (not shown) or the like. The LED package 4 is arranged so that the central axis (optical axis) O1 of the LED package 4 is perpendicular to the mounting surface 5a of the mounting substrate 5. The central axis (optical axis) O1 of the LED package 4 and the central axis (optical axis) O2 of the light emitting element 4a coincide with each other.

Further, the light emitted from the LED package 4 is emitted at a predetermined spread angle.

The lens member 6 is disposed so as to cover the light emission side (the diffusion plate 8 side) of the LED package 4, and the plurality of lens members 6 are in the A direction and the B direction (FIG. 2) as in the case of the plurality of LED packages 4. See). The lens member 6 is formed of a material (for example, resin or glass) that transmits light emitted from the LED package 4. The lens member 6 has a function of increasing the spread angle of the light emitted from the LED package 4.

Further, all the lens members 6 are formed in the same shape, and each lens member 6 includes a lens portion 6a and a plurality of (for example, three) leg portions 6b. The lens portion 6a includes a light emitting surface (upper surface) 6c and a lower surface 6d formed on the side opposite to the light emitting surface 6c.

As shown in FIG. 3, the light emitting surface 6c is formed in a substantially convex shape and is formed so that the spread angle of the light emitted from the lens member 6 is increased.

Further, the central portion of the light emitting surface 6c (the surface of the portion facing the LED package 4) is formed in a concave shape. In addition, the center part of the light-projection surface 6c does not need to be formed in concave shape.

A recess 6e is formed at the center of the lower surface 6d (the surface of the portion facing the LED package 4). The traveling direction of the light emitted from the LED package 4 is changed to the outer side by the recess 6e and the light emitting surface 6c, and the light spreading angle is increased. In addition, the recessed part 6e does not need to be formed in the center part of the lower surface 6d.

The leg portion 6 b is attached to the mounting surface 5 a of the mounting substrate 5 via the adhesive layer 11. Note that the heights of the legs 6b (the amount of protrusion from the lens 6a) are all the same.

Here, in the first embodiment, the lens member 6 is disposed such that the central axis (optical axis) O11 of the lens member 6 is inclined with respect to the central axis (optical axis) O1 of the LED package 4. The lens member 6 is arranged so that the central axis (optical axis) O11 of the lens member 6 is inclined with respect to the mounting surface 5a of the mounting substrate 5. That is, the lens member 6 is disposed so as to be inclined with respect to the mounting surface 5 a of the LED package 4 and the mounting substrate 5.

Specifically, the leg portion 6b of the lens member 6 is attached to the mounting substrate 5 by a plurality of adhesive layers 11 having different thicknesses (heights). The adhesive layer 11 is made of, for example, a thermosetting resin. In addition, when the resin (adhesive layer 11) is disposed on the mounting substrate 5, by individually controlling the resin discharge amount, the plurality of adhesive layers 11 can be easily formed in different thicknesses. It is.

In addition, as shown in FIGS. 4 and 5, the lens member 6 has a central axis O11 of the lens member 6 inclined toward the center side (inside) of the backlight device 3 with respect to the central axis O1 of the LED package 4. Is arranged. Therefore, the lens members 6 at both ends in the A direction (arrangement direction) are arranged so that the central axis O11 of the lens member 6 is inclined toward the central side (inside) in the A direction with respect to the central axis O1 of the LED package 4. Has been. Further, the lens members 6 at both ends in the B direction (arrangement direction) are arranged so that the central axis O11 of the lens member 6 is inclined toward the central side (inside) in the B direction with respect to the central axis O1 of the LED package 4. ing.

Further, among the plurality of lens members 6, the lens member 6 disposed on the outer peripheral portion is compared with the lens member 6 disposed on the central portion of the plurality of lens members 6, and the LED package 4 (central axis). The tilt angle with respect to O1) is large. Further, the inclination angle of the lens member 6 with respect to the LED package 4 (center axis O1) is gradually increased from the central portion of the backlight device 3 toward the outer peripheral portion.

As shown in FIG. 1, the reflecting member 7 is configured to transmit light from the lens member 6 (LED package 4) and light emitted from the lens member 6 (LED package 4) and reflected by the diffusion plate 8 to the upper side (diffuse). It is formed so as to reflect on the plate 8 side.

The diffusion plate 8 is formed so as to diffuse the light from the lens member 6 (LED package 4) and the like and to emit the light upward (to the liquid crystal display panel 2 side).

The optical sheet 9 has at least one of a function of condensing the light transmitted through the diffusion plate 8 and a function of diffusing the light transmitted through the diffusion plate 8.

Specifically, the optical sheet 9 may be formed of a lens sheet such as a lenticular or microlens sheet. In this case, the optical sheet 9 may be formed so that the light incident on the optical sheet 9 is once diffused and condensed when emitted to the liquid crystal display panel 2 side.

Further, the optical sheet 9 may be formed of, for example, a diffusion sheet having a function of diffusing incident light. The optical sheet 9 may be formed of a plurality of sheet materials including a microlens sheet and a diffusion sheet.

Next, the progression of light emitted from the LED package 4 will be described with reference to FIGS.

As shown in FIGS. 3 and 6, when the central axis O11 of the lens member 6 is disposed so as to be inclined, for example, in the C direction side with respect to the central axis O1 of the LED package 4 (in the case of FIG. 3). Compared with the case where the central axis O11 of the lens member 6 is aligned with the central axis O1 of the LED package 4 (in the case of FIG. 6), the light Q1 emitted from the LED package 4 is transmitted by the lens member 6. , It becomes easy to travel to the C direction side (the amount of light traveling to the C direction side increases). In the case of FIG. 3, the light Q11 traveling in the C direction side has a longer optical path length until reaching the diffusion plate 8 (liquid crystal display panel 2) than the light Q12 traveling in the D direction side. Easy to spread.

Thereby, it is possible to suppress the occurrence of a low-luminance portion in the C-direction side portion of the liquid crystal display panel 2 (the portion corresponding to the C-side portion of the LED package 4).

In the first embodiment, as described above, the lens member 6 is tilted toward the center side (inside) of the backlight device 3 with respect to the center axis O11 of the LED package 4 with respect to the center axis O11 of the LED package 4. Deploy. As a result, the light emitted from the LED package 4 can be easily advanced to the center side (inside) of the backlight device 3, so that a low-luminance portion occurs in the center side (inside) region of the liquid crystal display panel 2. Can be suppressed. As a result, it is possible to suppress the occurrence of, for example, lattice-like luminance unevenness (grid-like dark portion) in the liquid crystal display panel 2.

In the backlight device 3 according to the first embodiment, it is possible to suppress the occurrence of luminance unevenness in the liquid crystal display panel 2, so that the thickness of the backlight device 3 is reduced or the interval between the LED packages 4 is increased. (The number of LED packages 4 can be reduced).

In the first embodiment, as described above, the lens members 6 at both ends in the A direction and the B direction are arranged such that the center axis O11 of the lens member 6 is the center of the backlight device 3 with respect to the center axis O1 of the LED package 4. Arrange so as to incline to the side (inside). Thereby, it can suppress that a brightness | luminance becomes low in the part corresponding to the part between all the LED packages 4 among the liquid crystal display panels 2. FIG. That is, the occurrence of, for example, grid-like luminance unevenness in the liquid crystal display panel 2 can be further suppressed.

In the first embodiment, as described above, the lens member 6 disposed on the outer peripheral portion (outermost periphery) is in comparison with the lens member 6 disposed on the central portion with respect to the LED package 4 (central axis O1). The tilt angle is large. Thereby, it is possible to suppress the occurrence of luminance unevenness in the liquid crystal display panel 2 while suppressing the luminance of the central portion of the liquid crystal display panel 2 from being lowered, which is effective.

In the first embodiment, as described above, the inclination angle of the lens member 6 with respect to the LED package 4 is gradually increased from the center portion of the backlight device 3 toward the outer peripheral portion. As a result, it is possible to gradually change the way in which the light emitted from the LED package 4 spreads from the central part to the outer peripheral part of the backlight device 3, so that uneven brightness occurs in the liquid crystal display panel 2. Can be suppressed.

In the first embodiment, the lens member 6 is attached to the mounting substrate 5 as described above. Thereby, since it is not necessary to align the LED package 4 and the lens member 6 after the lens member 6 is attached to the mounting substrate 5, it is possible to prevent the assembly process of the backlight device 3 from becoming complicated. it can. Further, the lens member 6 can be prevented from being displaced with respect to the LED package 4.

In the first embodiment, as described above, the lens member 6 is attached to the mounting substrate 5 with the plurality of adhesive layers 11 having different thicknesses. Thereby, the lens member 6 can be easily arranged so as to be inclined with respect to the LED package 4 and the mounting substrate 5.

Further, the lens member 6 can be disposed so as to be inclined with respect to the LED package 4 only by providing a plurality of adhesive layers 11 having different thicknesses. Thereby, even if it is a case where the spreading method of light is controlled for every LED package 4, it is not necessary to form the lens member 6 in a different shape for every LED package 4. FIG. For this reason, it is possible to easily suppress the occurrence of luminance unevenness in the liquid crystal display panel 2 while suppressing an increase in the number of parts and cost.

In the first embodiment, as described above, the light emitting diode (LED package 4) is used as the light source. As described above, when the light emitting diode (LED package 4) is used as the light source, luminance unevenness is likely to occur in the liquid crystal display panel 2. Therefore, when the light emitting diode (LED package 4) is used as the light source, the present invention is applied. It is particularly effective.

Also, the direct-type backlight device 3 is more likely to cause uneven brightness in the liquid crystal display panel 2 than the edge light type (side light type) backlight device. For this reason, it is particularly effective to apply the present invention when the direct type backlight device 3 is used.

In the first embodiment, the optical sheet 9 is disposed between the diffusion plate 8 and the liquid crystal display panel 2 as described above. Thereby, when the optical sheet 9 has a function of condensing the light transmitted through the diffusion plate 8 (when the optical sheet 9 is a lens sheet, for example), the luminance in the front direction of the liquid crystal display panel 2 can be improved. it can. Further, when the optical sheet 9 has a function of diffusing the light transmitted through the diffusion plate 8 (when the optical sheet 9 is a lens sheet or a diffusion sheet having a function of diffusing the incident light), the liquid crystal display panel 2 is used. The occurrence of uneven brightness can be further suppressed.

(Second Embodiment)
In the second embodiment, referring to FIGS. 7 and 8, unlike the first embodiment, the lens member 6 is disposed so as to be inclined to the outside of the backlight device with respect to the LED package 4. The case will be described.

In the liquid crystal display device according to the second embodiment of the present invention, as shown in FIGS. 7 and 8, the lens member 6 is disposed so as to be inclined outward with respect to the LED package 4.

Specifically, the lens member 6 is disposed so that the central axis O11 of the lens member 6 is inclined to the outside (four sides) of the backlight device with respect to the central axis O1 of the LED package 4. Therefore, the lens members 6 at both ends in the A direction (arrangement direction) are arranged so that the central axis O11 of the lens member 6 is inclined outward in the A direction with respect to the central axis O1 of the LED package 4. The lens members 6 at both ends in the B direction (arrangement direction) are arranged so that the central axis O11 of the lens member 6 is inclined outward in the B direction with respect to the central axis O1 of the LED package 4.

Further, as in the first embodiment, the lens member 6 disposed in the outer peripheral portion of the plurality of lens members 6 is compared with the lens member 6 disposed in the central portion of the plurality of lens members 6. Thus, the inclination angle with respect to the LED package 4 (center axis O1) is large. Further, the inclination angle of the lens member 6 with respect to the LED package 4 (center axis O1) is gradually increased from the central portion of the backlight device 3 toward the outer peripheral portion.

In addition, you may arrange | position all the lens members 6 so that it may incline to the outer side of a backlight apparatus with respect to LED package 4 (center axis O1). Moreover, even if it arrange | positions only the lens member 6 arrange | positioned among the lens members 6 in the outermost periphery (outer peripheral part) so that it may incline outside a backlight apparatus with respect to LED package 4 (center axis O1). Good. That is, the lens member 6 other than the outermost periphery (outer peripheral portion) may be arranged so that the central axis O11 of the lens member 6 coincides with the central axis O1 of the LED package 4.

Other structures of the second embodiment are the same as those of the first embodiment.

In the second embodiment, as described above, the lens member 6 is arranged so that the central axis O11 of the lens member 6 is inclined outward (four sides) of the backlight device with respect to the central axis O1 of the LED package 4. Deploy. Thereby, since the light radiate | emitted from LED package 4 can be easily advanced outside a backlight apparatus, it can suppress that a part with a low brightness | luminance generate | occur | produces in the area | region outside the liquid crystal display panel 2. FIG. As a result, the occurrence of, for example, frame-shaped luminance unevenness (frame-shaped dark portion) in the liquid crystal display panel 2 can be suppressed.

In the second embodiment, as described above, the lens members 6 at both ends in the A direction and the B direction are arranged so that the center axis O11 of the lens member 6 is outside the backlight device with respect to the center axis O1 of the LED package 4. Arrange them so that they tilt. As a result, it is possible to effectively suppress the occurrence of a low-luminance portion in the region outside the liquid crystal display panel 2, so that, for example, a frame-like luminance unevenness occurs in the liquid crystal display panel 2. , Can be effectively suppressed.

The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

(Third embodiment)
In the third embodiment, a case will be described with reference to FIGS. 9 and 10 where, unlike the first and second embodiments, the luminance of the four corners of the liquid crystal display panel 2 is suppressed from being lowered.

In the liquid crystal display device according to the third embodiment of the present invention, as shown in FIGS. 9 and 10, only the lens member 206a at the four corners of the lens member 6 has a central axis O11 of the lens member 206a. Are arranged so as to be inclined toward the four corners (four corners) of the backlight device with respect to the central axis O1. On the other hand, the lens members 206b arranged at the corners other than the four corners of the lens member 6 are arranged such that the central axis O11 of the lens member 206b coincides with the central axis O1 of the LED package 4.

9 and 10, only one lens member 6 (206a) is disposed so as to be inclined with respect to the LED package 4 at each corner (each corner portion). The lens member 6 may be arranged so as to be inclined with respect to the LED package 4.

Other structures of the third embodiment are the same as those of the first and second embodiments.

In the third embodiment, as described above, the lens member 206a at the four corners is tilted toward the four corners of the backlight device with respect to the central axis O11 of the LED member 4 with respect to the central axis O1 of the LED package 4. Deploy. Thereby, since the light radiate | emitted from LED package 4 can be easily advanced to the four corner side of a backlight apparatus, it can suppress that the brightness | luminance of the four corners of the liquid crystal display panel 2 becomes low.

The remaining effects of the third embodiment are similar to those of the aforementioned first and second embodiments.

(Fourth embodiment)
In the fourth embodiment, referring to FIGS. 11 and 12, unlike the first to third embodiments, the present invention is applied to an edge light type (side light type) backlight device 303. explain.

The liquid crystal display device 301 according to the fourth embodiment of the present invention is configured by a liquid crystal display panel 2 and a backlight device 303 that illuminates the liquid crystal display panel 2, as shown in FIG. The liquid crystal display device 301 is an example of the “display device” in the present invention, and the backlight device 303 is an example of the “illumination device” in the present invention.

Here, in the fourth embodiment, the backlight device 303 is an edge light type backlight device, and includes a plurality of LED packages 4, a mounting substrate 5, a plurality of lens members 6, a reflecting member 307, and a lens. A light guide plate 308 that guides light from the member 6 (LED package 4) and emits the light toward the liquid crystal display panel 2, the optical sheet 9 disposed between the light guide plate 308 and the liquid crystal display panel 2, and a backlight chassis 10 and so on.

The plurality of LED packages 4 and the plurality of lens members 6 are arranged, for example, in the longitudinal direction (A direction) of the liquid crystal display panel 2 (see FIG. 11), as shown in FIG.

Here, in 4th Embodiment, the lens member 6 is arrange | positioned so that the central axis O11 of the lens member 6 may incline to the center side (inner side) of A direction with respect to the central axis O1 of the LED package 4. FIG. Yes.

The other structure of the fourth embodiment is the same as that of the first to third embodiments.

In the fourth embodiment, as described above, the present invention is applied to the edge light type backlight device 303. In the edge light type backlight device 303, for example, spot-like (circular or elliptical) luminance unevenness (spot-like bright part) is likely to occur in the vicinity of the LED package 4 in the liquid crystal display panel 2. . However, since the backlight device 303 according to the fourth embodiment can control the way in which the light emitted from the LED package 4 spreads, a portion of the liquid crystal display panel 2 in the vicinity of the LED package 4 has a spot shape, for example. The occurrence of uneven brightness can be easily suppressed.

Other effects of the fourth embodiment are the same as those of the first to third embodiments.

In addition, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims, and further includes meanings equivalent to the scope of claims and all modifications within the scope.

For example, in the above-described embodiment, an example in which the display device is applied to a liquid crystal display device has been described. However, the present invention is not limited thereto, and may be applied to a display device other than the liquid crystal display device.

Moreover, in the said embodiment, although the backlight apparatus which illuminates a display panel was demonstrated as an example of an illuminating device, this invention is applicable not only to this but the illuminating device which illuminates to-be-illuminated members other than a display panel. It is.

In the above embodiment, the light source is shown as an example configured to include one light emitting element that emits blue light and a phosphor that converts part of the blue light into yellow light. However, the present invention is not limited to this, and the light source may be configured to include two or more light emitting elements. In this case, for example, the first modification of the present invention shown in FIGS. 13 and 14 and the second modification of the present invention shown in FIGS. 15 and 16 may be configured.

That is, as shown in FIGS. 13 and 14, the LED package 404 is formed to include, for example, three light emitting elements (light emitting portions) 404a, 404b, and 404c that emit red light, green light, and blue light, respectively. The lens member 6 may be disposed such that the central axis of the lens member 6 is inclined with respect to the central axis O401 of the three

light emitting elements

404a, 404b, and 404c.

As shown in FIGS. 15 and 16, for example, an LED package 504a including a light emitting element 404a, an LED package 504b including a light emitting element 404b, and an LED package 504c including a light emitting element 404c constitute a light source, and a lens. The member 6 may be disposed such that the central axis of the lens member 6 is inclined with respect to the central axis O501 of the three

light emitting elements

404a, 404b, and 404c.

In the above embodiment, an example in which all lens members are formed in the same shape has been described. However, the present invention is not limited to this, and all lens members may not be formed in the same shape.

Moreover, in the said embodiment, although the example which made all the height of the leg part of a lens member the same magnitude | size was shown, this invention is not restricted to this, All the height of the leg part of a lens member is the same magnitude | size. You don't have to. That is, the lens member may be formed so as to include a plurality of legs having different heights. In this case, the thickness of the adhesive layer may be the same (uniform).

In the above embodiment, an example in which the lens member is provided with the leg portion has been described. However, the present invention is not limited thereto, and the lens member may not be provided with the leg portion.

Moreover, in the said embodiment, although the lens member was shown about the example attached to the mounting board using the contact bonding layer, this invention is not restricted to this, A lens member is attached to a mounting board without using an contact bonding layer. May be. In this case, for example, an engaging portion that engages with a mounting substrate or the like may be provided on the leg portion of the lens member.

Moreover, in the said embodiment, although the example which formed the contact bonding layer with the thermosetting resin was shown, for example, this invention is not restricted to this, You may form an contact bonding layer other than a thermosetting resin. . For example, the adhesive layer may be formed with an adhesive tape.

Further, when a plurality of adhesive layers having different thicknesses are formed, the adhesive layer having a small thickness may be formed by one layer, and the adhesive layer having a large thickness may be formed by a plurality of layers.

Further, for example, in the first embodiment, the example in which the inclination angle of the lens member with respect to the LED package is gradually increased from the central part to the outer peripheral part of the backlight device has been described, but the present invention is not limited thereto. The inclination angle of the lens member with respect to the LED package does not have to be gradually increased from the center portion of the backlight device toward the outer peripheral portion. For example, the inclination angle of some or all lens members with respect to the LED package may be the same.

In the above-described embodiment, the example in which the lens member is attached to the mounting substrate has been described. However, the present invention is not limited thereto, and the lens member may be attached to a member other than the mounting substrate, such as a backlight chassis. Good.

In the above embodiment, an example in which the optical sheet is disposed between the diffusion plate or the light guide plate and the liquid crystal display panel has been described. However, the present invention is not limited thereto, and the diffusion plate or the light guide plate and the liquid crystal display panel It is not necessary to arrange an optical sheet between them.

1,301 Liquid crystal display device (display device)
2 Liquid crystal display panel (display panel)
3,303 Backlight device (lighting device)
4, 404, 504a, 504b, 504c LED package (light source, light emitting diode)
4a, 404a, 404b, 404c Light emitting element (light emitting part)
5 Mounting substrate

5a Mounting surface

6, 206a Lens member 8 Diffusion plate 9 Optical sheet 11 Adhesive layer 308 Light guide plate O1, O11, O401, O501 Central axis

Claims

Multiple light sources;
A plurality of lens members which are provided corresponding to each of the plurality of light sources and increase the spread angle of the light emitted from the light sources;
At least one of the lens members is arranged to be inclined with respect to the light source.
2. The illumination according to claim 1, wherein at least one of the lens members is arranged such that a central axis of the lens member is inclined to a predetermined position side with respect to a central axis of the light source. apparatus.
The at least one of the lens members is arranged so that a central axis of the lens member is inclined inward of the lighting device with respect to a central axis of the light source. Lighting equipment.
The plurality of light sources and the plurality of lens members are arranged in a predetermined direction,
Among the plurality of lens members, the lens members at least at both ends in the arrangement direction are arranged such that a central axis of the lens member is inclined inward of the illumination device with respect to a central axis of the light source. The lighting device according to claim 3.
The at least one of the lens members is arranged so that a central axis of the lens member is inclined to the outside of the lighting device with respect to a central axis of the light source. Lighting equipment.
The plurality of light sources and the plurality of lens members are arranged in a predetermined direction,
Among the plurality of lens members, the lens members at least at both ends in the arrangement direction are arranged such that the central axis of the lens member is inclined outward of the illumination device with respect to the central axis of the light source. The lighting device according to claim 5.
Among the plurality of lens members, the lens member disposed on the outer peripheral portion has a larger inclination angle with respect to the light source than the lens member disposed on the central portion of the plurality of lens members. The lighting device according to any one of claims 1 to 6.
The lighting device according to claim 7, wherein an inclination angle of the lens member with respect to the light source gradually increases from a central portion of the lighting device toward an outer peripheral portion.
A mounting board to which the light source is attached;
The lighting device according to any one of claims 1 to 8, wherein the lens member is attached to the mounting substrate.
The mounting board has a mounting surface to which the light source is attached,
The lighting device according to claim 9, wherein at least one of the lens members is arranged such that a central axis of the lens member is inclined with respect to a mounting surface of the mounting board.
The lighting device according to claim 10, wherein at least one of the lens members is attached to the mounting substrate by a plurality of adhesive layers having different thicknesses.
The lighting device according to any one of claims 1 to 11, wherein the light source includes a light emitting diode.
The lighting device according to any one of claims 1 to 12, wherein the lighting device is a direct type lighting device.
A diffusion plate having a function of diffusing light from the lens member;
The optical sheet according to claim 13, further comprising: an optical sheet having at least one of a function of condensing the light transmitted through the diffusion plate and a function of diffusing the light transmitted through the diffusion plate. Lighting device.
The lighting device according to any one of claims 1 to 12, wherein the lighting device is an edge light type lighting device.
A light guide plate having a function of guiding light from the lens member;
The optical sheet according to claim 15, further comprising: an optical sheet having at least one of a function of condensing the light transmitted through the light guide plate and a function of diffusing the light transmitted through the light guide plate. Lighting device.
Each of the light sources includes one or more light emitting units,
The at least one of the lens members is arranged such that a central axis of the lens member is inclined with respect to a central axis of the one or more light emitting units. The lighting device according to claim 1.
The lighting device according to any one of claims 1 to 17,
A display device comprising a display panel illuminated by the illumination device.