JP2010062305A - Lighting system, and liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device with a back light module operating with high efficiency and low power while ensuring optical uniformity in luminance and chromaticity. <P>SOLUTION: A lens material made of a transparent resin material having an irregular form is mounted on a package having a light source including wiring disposed on a substrate, an LED element connected with the wiring and a transparent resin for sealing the element as a base to construct a light source module. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an illumination device including a package light source using a light-emitting diode element, and a liquid crystal display device using the package light source as a backlight light source.

In recent years, light-emitting diode LED elements have been used in backlight devices for lighting devices, display devices, mobile phones, and liquid crystal televisions. This light-emitting diode LED element is considered to have an expanded application range in the future.
In an LED backlight light source module used in a liquid crystal display device, an extended color reproduction range, high-speed independent control corresponding to moving images, and an improvement in contrast are realized as compared with a conventional cold cathode fluorescent lamp (CCFL).
However, in order to realize a thin and light configuration that is a future trend, a simple light source module is required to have high optical brightness uniformity. In addition, low power consumption by a highly efficient backlight is a very important issue.

  So far, a package of a light source has been disclosed for a package of a light source that excites a phosphor to obtain white light (see, for example, Patent Document 1). In this Patent Document 1, a blue light emitting element is mounted in a bare state on a substrate having a reflector in a package. Then, a concave lens resin is mounted with a space between the blue light emitting element and the blue light emitting element, and a phosphor is applied or pasted thereon.

Similarly, a blue light emitting element is used to excite a phosphor to produce a white light source (see, for example, Patent Document 2). In this patent document 2, the structure is such that a convex lens resin is molded after a phosphor is first coated and sealed on a blue light emitting element mounted on a substrate.
The shape of the lens material used in Patent Document 1 and Patent Document 2 is disclosed in Patent Document 3 and Patent Document.

  Moreover, the formation method regarding a lens is also disclosed (for example, refer patent document 3). In Patent Document 3, a convex lens is formed on a base material having a reflector by potting or a mold, or a dome-shaped convex lens is formed on a normal resin-sealed surface-mount package. The structure is formed by adding.

Furthermore, another method has been disclosed as a method for forming a lens (for example, see Patent Document 4). In Patent Document 4, a method is adopted in which a concave lens having a special shape is prepared in advance and covered with a surface mount type package, or a package with a convex lens.
JP 2007-142152 A JP 2007-158209 A JP 2001-36147 A JP 2003-8068 A

In a normal package light source, the luminance is relatively strong immediately above the LED element, and it appears as a bright spot. For this reason, when applied to an illuminating device or a liquid crystal display device, it is necessary to disperse the bright spots of the light source and disperse the intensity distribution as a far-field image in the light source.
Furthermore, it is necessary to suppress the light loss as much as possible and efficiently utilize the light intensity of the light source with respect to the target illumination device or the backlight light source of the liquid crystal display.
However, heretofore, no measures have been taken for these.

In Patent Document 1 and Patent Document 2, the content of realizing white light by the phosphor and the resin and the configuration of the lens material are described, but only the configuration at the package level is disclosed.
Moreover, in the said patent document 1 and patent document 2, it discloses about connecting a package sideways and utilizing as a light guide. Further, in Patent Document 1 and Patent Document 2, in the lens material, the direction in which the light emitted from the LED element is used by condensing in the front direction or being refracted in the lateral direction is defined by the shape of the convex lens or the concave lens. is doing.

  In particular, it is still insufficient for use as a backlight light source of a liquid crystal display device in consideration of the coupling efficiency to the optical system and the transmittance to the liquid crystal panel through the color filter. It is necessary to utilize the light intensity of the light source as efficiently as possible and to have directivity in a specific direction to be utilized, but the structure is not described.

  An object of the present invention is to provide an illumination device including a backlight light source module that can improve the optical uniformity of luminance and chromaticity in a low-cost package.

  In addition, the present invention provides a liquid crystal display device using a backlight light source module that can improve the optical uniformity of luminance and chromaticity as a direct backlight light source module in a low-cost package. Objective.

In order to solve the above-mentioned problems, an illumination device according to the present invention seals a base material, wiring formed on the base material, a plurality of light emitting diode LED elements connected to the wiring, and the plurality of LED elements. In a surface mount type package light source having a transparent resin to be stopped and a reflector,
The transparent resin is formed with a concave surface at a position lower than the height of the package reflector,
An air layer is provided on the transparent resin,
A resin material lens material is placed on the package and bonded and fixed via the air layer. The lens material has a convex surface shape on the lower surface, and the surface shape of the upper surface of the lens material allows the surface-mounted radiation. It is characterized by comprising a package light source having a lens material configuration for narrowing the angular distribution to a low angle range or converting it to a radiation angle distribution expanded to a high angle range.

  In order to solve the above-described problem, in the illumination device according to the present invention, the lower surface of the lens material mounted on the package has a convex surface shape, and the upper surface of the lens material has a convex shape. The lens material having a radiation angle distribution narrowed down to a low angle range and having a concave shape on the upper surface of the lens material, the lens material having a radiation angle distribution expanded to a high angle range. A configuration is provided.

  In order to solve the above-described problems, an illumination device according to the present invention is configured such that the package includes one or a plurality of LED elements.

  In order to solve the above-described problem, an illumination device according to the present invention is configured such that the package light source is a white light source, and the package light source is mounted and mounted on the substrate. It has at least a configuration made of a phosphor-containing resin that seals the blue LED element, and the blue LED element is arranged in the shape of the straight line and includes the configuration of the lens material.

  In order to solve the above-described problems, in the illumination device according to the present invention, the package light source is composed of red, green, and blue RGB light sources, and the package light source mounted on the substrate has a plurality of red, green, and blue configurations. Each of the LED elements and the plurality of LED elements are formed of a transparent resin, and the red, green, and blue LED elements are arranged in a linear line to constitute the lens material.

  In order to solve the above-described problems, a liquid crystal display device according to the present invention is configured by mounting the package light source on a liquid crystal display device, and mounting the package light source on the liquid crystal display device. It is used as a backlight light source module or as a side light type backlight light source module.

  In order to solve the above problems, a liquid crystal display device according to the present invention is configured by mounting the package light source on a liquid crystal display device, and the lens material mounted on the package is provided with a convex shape on an upper surface. The package light source having the lens material having a radiation angle distribution narrowed down to a low angle range in a certain configuration is used as a sidelight type backlight light source module.

  In order to solve the above problems, a liquid crystal display device according to the present invention is configured by mounting the package light source on a liquid crystal display device, and the lens material mounted on the package is provided with a concave shape on an upper surface. The package light source on which the lens material having the radiation angle distribution expanded to a high angle range is mounted as a direct-type backlight light source module.

  ADVANTAGE OF THE INVENTION According to this invention, the illuminating device which consists of a backlight light source module which can improve the optical uniformity of a brightness | luminance and chromaticity with a low-cost package can be provided.

  Moreover, according to the present invention, it is possible to provide a backlight module that operates with high efficiency and low power while ensuring optical uniformity of luminance and chromaticity.

  Furthermore, according to the present invention, there is provided a liquid crystal display device using a backlight source module capable of improving the optical uniformity of luminance and chromaticity as a direct backlight source module in a low-cost package. be able to.

  The content of the present invention solves the problem by the above configuration. In this content, by designing the configuration of the package and the lens with respect to the light emitted from the LED element, both the radiation distribution control of the package light source and the improvement of the light utilization efficiency are realized.

In the present invention, a lens material having a specific shape is mounted on a surface mount type package light source in order to realize a light intensity distribution suitable for a target illumination device or liquid crystal display device.
At this time, in the present invention, an air layer is appropriately set between the package and the lens material so that the light distribution from the package is expanded as much as possible to avoid bright spots.
Further, by designing the structure of the air layer and the package and the lens material, a means for realizing a package light source as a light source of a desired illumination device and liquid crystal display device is taken.

Hereinafter, specific embodiments for carrying out the present invention for solving the above problems will be described in detail with reference to the drawings of the examples.
In the embodiment of the present invention, the package light source and the LED backlight light source module of the liquid crystal display device will be described from the configuration of the package and the lens.

1 to 10 show a first embodiment of the present invention.
In Example 1, a package light source serving as a light source of the following illumination device will be described.
FIG. 1 is a cross-sectional view illustrating a configuration of a surface mount type package light source according to the first embodiment.
FIG. 2 is a cross-sectional view showing a state in which a lens is mounted on the surface-mount package light source shown in FIG.
FIG. 3 is a cross-sectional view showing a state where another lens is mounted on the surface mount type package light source shown in FIG.
FIG. 4 is a cross-sectional view showing a state in which another lens is mounted on the surface mount type package light source shown in FIG.
FIG. 5 is a conceptual diagram showing light rays that pass through a lens mounted on the surface-mount package light source shown in FIG.
FIG. 6 is a conceptual diagram showing light rays passing through a lens mounted on the surface mount type package light source shown in FIG.
FIG. 8 is a view showing a lighting device on which the surface mount type package light source shown in FIG. 1 is mounted.
FIG. 9 is a view showing a multi-light source package in which a plurality of surface-mount package light sources shown in FIG. 1 are mounted.
FIG. 10 is a view showing a lighting device on which the surface mount type multi-light source package shown in FIG. 9 is mounted.

In FIG. 1, first, a package light source as shown in the sectional view of FIG. 1 is prepared as a general-purpose package. As a mounting substrate on which the LED element is mounted, a base material 1 made of a resin package or a ceramic material is prepared in accordance with the application.
After the wiring 2 is formed on the substrate 1, the reflector 3 is mounted. In producing these packages, it is also possible to produce them in a lump with a molding machine using the constituent materials.

  Thereafter, in order to mount and fix the element, a BlueLED element 5 as an excitation source is fixed to the base material 1 by using the die bonding material 4. Next, the Au wire 6 is used for wire connection to the element and the wiring so that conduction can be obtained.

Thereafter, a resin 7 containing a phosphor is applied and sealed around the Blue element 5, and further, a surface mount type package sealed with a transparent resin 8 is formed. Here, a white light source for photoexciting a phosphor with a Blue element is obtained.
Moreover, the shape of the transparent resin 8 to be sealed is set to a concave shape with a depressed center. Thereby, the effect of the optical expansion by a concave lens is acquired in a package.

Next, as shown in the cross-sectional view of FIG. 2, a lens material 9 made of a transparent resin is preliminarily mounted on the package structure made in FIG. At this time, a space is provided between the sealing resin 8 and the lens material 9 so that the air layer 10 having a refractive index of 1 is provided as a gap layer. Here, although the air gap layer is an air layer, any material having a low refractive index can be applied. It is assumed that the transparent material has a lower refractive index than that of the transparent resin 8 and has a configuration of a low refractive index layer having nanopores or a low refractive index layer made of airgel. The material is composed of a low refractive index layer having nanopores or an airgel low refractive index layer in which a base material is formed based on silica SiO ₂ or alumina Al ₂ O ₃ .
The transparent resin of the lens material 9 is preferably formed of the same material as the sealed transparent resin 8. Depending on the application, the lens material 9 can be made of different transparent resins. Here, the lens material 9 is fixed immediately above the transparent resin 8 in which the LED element in FIG. 1 is sealed. As shown in FIG. 3, the reflector 3 and the sealing resin are aligned with the outer periphery of the reflector 3. It may be fixed to.

The resin lens material 9 is fixed to the sealing resin 8 and the reflector 3 by thermosetting or photocuring with a transparent resin. By performing the fixing process in a vacuumed environment, the air layer 10 is obtained. Is formed under reduced pressure.
The decompressed air layer 10 brings the lens material 9 into close contact with the sealing resin 8 and the reflector 3 of the package. This further prevents deformation due to thermal expansion and stabilizes the convex shape of the lower surface of the resin lens material 9.

As shown in FIG. 4, the resin lens material 9 can narrow the radiation distribution of emitted light by providing a convex shape on the upper surface opposite to the package and forming convex lenses on both upper and lower surfaces. Due to the convex curvature radius of the upper surface of the resin lens material 9, the resin lens material 9 can also make most of the emitted light parallel light.
In addition, when the range for narrowing the radiation distribution of the emitted light is enlarged and controlled, it is also possible to control the radiation distribution by making the lower surface of the resin lens material 9 concave. At this time, if the effective thickness of the air layer 10 is D with respect to the light emitted from the transparent resin 8, and the incident angle α from the transparent resin 8 is the exit angle β to the air layer 10,
D · (tanβ−tanα) = D · (tan (sin ⁻¹ (n · sinα))
It is possible to control the radiation distribution while enlarging the distance of.

Next, contents for controlling the radiation distribution from the package in the present embodiment will be described below.
5 and 6 schematically illustrate the configuration of the present embodiment. Among the light intensity distributions emitted from the LED elements, the light intensity distribution that transmits and refracts the sealing resin 8 whose surface is set to a concave shape, and the sealing are shown. In the light intensity distribution totally reflected on the concave surface on the surface of the stop resin 8, a diagram in which light rays are traced is shown.

First, since the concave surface on the surface of the sealing resin 8 is largely refracted by the surface of the concave lens and the air layer 10, the light intensity distribution is expanded and dispersed.
In FIG. 5, the light beam that has been transmitted and refracted through the sealing resin 8 and condensed is concentrated by the lower surface convex surface of the lens material 9, and the light beam that squeezes the emitted light by the upper surface convex surface of the lens material 9 is shown.
Here, if the curvature radius of the convex surface of the lower surface of the lens material 9 is R ₁ and the curvature radius of the convex surface of the upper surface is R ₂ , the focal length f of the emitted light from the lens material 9 is approximately expressed by the equation (1). Can be expressed as:

[Formula 1]
f = 1 / {(n−1) (1 / R ₂ −1 / R ₂ ) + (n−1) ² d / nR ₁ R ₂ }

In formula (1), n is the refractive index of the lens material, and d is the thickness of the lens material.
Further, in the formula (1), when the second term in the denominator is smaller than the first term, that is, when the factor depending on the lens thickness d is small, the following formula (2) is shown. Is approximated as follows.

[Formula 2]
f = 1 / {(n−1) (1 / R ₂ −1 / R ₂ )}

The package light source shown in FIGS. 2 and 4 is designed to be close to a radiation distribution suitable as a light source for an illumination device and a liquid crystal display device by controlling the focal length f of light emitted from the package.
In this embodiment, a narrowed light source that achieves a long focal length and emits light to a long distance is achieved.

FIG. 6 shows a traveling path of light rays that are totally reflected on the surface of the sealing resin 8 and multiple-reflected with the reflector 3 to be guided and spread in the lateral direction.
In FIG. 6, the light emitted from the LED element 5 at a high angle is totally reflected on the surface of the sealing resin 8, and then this light repeatedly repeats multiple reflections with the reflecting surface of the reflector 3. However, the light is reflected on the side wall of the lens material 9 or is reflected on the side wall of the lens material 9 while repeating multiple reflection with the reflecting surface of the reflector 3.

At this time, the reflection on the side wall of the lens material 9 is set to a condition in which the majority is totally reflected. Under these conditions, the size of the package, the slope of the reflector 3, the concave shape of the sealing resin, the side wall length and angle of the lens material 9, and the like are control parameters.
Therefore, these are determined according to the application and design.
In this way, the light beam emitted from the LED element 5 at a high angle is totally reflected on the side wall of the lens material 9 and then emitted upward from the upper surface of the lens material 9.
The light emitted from the LED element 5 at a high angle from the upper surface of the lens material 9 also depends on the convex shape of the upper surface of the sealing resin and the lens thickness based on the expression expressing the focal length. It is possible to adjust the radiation angle.

  With the configuration of the first embodiment, it is realized that the emitted light of the low angle and the high angle of the LED element has a radiation distribution mostly in the upper surface direction of the lens material. Thereby, in order to efficiently couple the emitted light of the LED element to the upper surface or the front surface direction of the package, both the control of the radiation distribution and the improvement of the light utilization efficiency can be achieved.

  By applying the lens material 9 and the air layer 10 of the present embodiment, it is shown that the radiation distribution can be expanded and controlled by light expansion even in the case of a convex lens. In FIG. 7, when the lens material 9 is mounted, the radiation distribution is measured and evaluated for comparison with and without the air layer 10. Here, the radiation distribution of the package to be a concave lens before mounting the lens material 9 is also shown. By mounting the lens material 9 which is a convex lens from the radiation distribution before mounting the lens material 9, the angular distribution is made narrower.

Here, first, the radiation distribution is measured and evaluated with respect to the configuration in which the air layer 10 is provided, and then the air layer 10 is embedded with the same transparent resin material, thereby forming the configuration without the air layer 10 with the same package light source. On the other hand, the result of measuring and evaluating the radiation distribution is shown. From the result of FIG. 7, it can be seen that by providing the air layer 10, it is possible to obtain a radiation distribution in which the angular distribution is enlarged while ensuring the function of collecting the radiated light as the convex lens of the lens material 9. The degree to which the angle distribution is enlarged can be controlled by the shape of the lower surface of the lens material 9 and the thickness, width and shape of the air layer or the low refractive index layer as the gap layer.
In general, the thicker the air layer or the low refractive index layer as the gap layer and the wider the width, the wider the radiation distribution can be obtained.

FIG. 8 shows an example in which the package light source of this embodiment is applied to a lighting device.
In FIG. 8, the package light source shown in FIGS. 2, 3, and 4 is mounted on the housing 12 of the lighting device having the reflecting plate 11, thereby having a radiation distribution narrowed down in a state close to a point light source. The lighting device is realized.

FIG. 9 shows an illumination device in which a plurality of BlueLED elements are mounted to form a long multi-light source.
In FIG. 9, in the longitudinal section direction, it is manufactured in the same manner as the package light source on which the single element shown in FIGS. 2, 3, and 4 is mounted, but in the transverse section direction, it is configured as shown in FIG. ing.
In FIG. 9, a plurality of elements are mounted and mounted in the horizontal direction, a phosphor-containing resin is applied and sealed, and then a transparent resin and a lens material 9 are mounted to constitute a multi-light source. This long multi-light source constitutes a line light source.

FIG. 10 shows an illumination device formed in the same manner as in FIG. When a multi-light source is mounted as shown in FIG. 10, an illumination device having a narrowed radiation distribution as a line light source is realized.
In the present embodiment, the configuration of the package and the lens is designed for the light emitted from the LED element 5, thereby realizing both the radiation distribution control of the package light source and the improvement of the light utilization efficiency.
By applying the package light source shown in this embodiment, an illumination device of a point light source or a line light source is realized.
And the light source of the illuminating device narrowed down to the predetermined | prescribed range is realizable by designing a package and the lens 9 according to a use, and controlling a focal distance.

  In the first embodiment, a blue LED element is mounted on the light source, and a white light source that excites the phosphor is used. However, the LED element 5 may be mounted with a blue element, a green element, and a red element. In the LED element 5, the blue element, the green element, and the red element are simultaneously mounted, and the white chromaticity can be adjusted and the white correction balance can be achieved by controlling the driving conditions.

A second embodiment of the present invention is shown in FIGS.
In Example 2, a package light source serving as a backlight light source for a liquid crystal display device will be described.
FIG. 11 is a cross-sectional view illustrating a configuration of a package light source of the sidelight type backlight according to the second embodiment.
12 is a cross-sectional view of the liquid crystal panel in a state where the surface mount type package light source shown in FIG. 1 is mounted.
FIG. 13 is a plan view showing a liquid crystal panel when the package light source of the sidelight type backlight shown in FIG. 1 is mounted.

In FIG. 12 and FIG. 13, a light source module for a sidelight type backlight is configured as a backlight system.
Hereinafter, a configuration of the sidelight type light source module will be described.
FIG. 11 is a schematic view showing a part of the sidelight type backlight light source module.
In FIG. 11, first, a light source module 14 manufactured with the configuration of the first embodiment is prepared.
The base material 1 is designed so as to correspond to the configuration of the sidelight type backlight, and the wiring pattern and mounting are set so as to correspond to the configuration.

A reflection sheet 16, a light guide plate 17, diffusion sheets 18 and 19, a prism sheet 20, and a polarization reflection sheet 21 are mounted on the backlight optical system support housing 15. With this configuration, the optical system of the backlight light source module is configured. The light source module 14 is fixed on the support housing 15 by a heat sink attached to the support housing 14.
Further, the upper side and the lower side of the light source module 14 are covered with a reflection sheet 16. In the second embodiment, in particular, a configuration is adopted in which the light loss of the light source module is surrounded by the reflective sheet so that the light loss is as small as possible up to the region where the light emitted from the light source module is introduced into the light guide plate 17.

In FIG. 11, the emitted light from the light source module is indicated by a light beam with an arrow in the drawing, but as described in the first embodiment, the focal length set by the package and the lens material 9 is taken into consideration. The distance to the end of the light guide plate 17 is designed.
Further, in FIG. 11, the configuration of the package and the lens material 9 and the distance to the end of the light guide plate are set so that the coupling efficiency to the light guide plate 17 is maximized.

12 and 13 show a cross section and an upper surface in the configuration of the backlight source module 22 as a whole and the thin film transistor-equipped liquid crystal panel 23 including the upper and lower polarizing plates. Accordingly, the backlight light source module is configured by the casing 12, the light guide plate 17, and the optical system sheets (diffusion sheet 18, diffusion sheet 19, prism sheet 20, and polarization reflection sheet 21) in the thickness direction. A thin and lightweight liquid crystal display device can be provided.
According to the second embodiment, a side-light type backlight light source module that controls the radiation distribution of the light source module and improves the coupling efficiency to the light guide plate 17 even if the size of the liquid crystal display device is made thin and thin is configured. Can do.
By performing optical design for the multi-light source module, it is possible to ensure the required uniformity of luminance distribution and chromaticity distribution.

The second embodiment is not only applicable as a liquid crystal panel display device and a backlight module for a large TV, but also for a liquid crystal panel for a personal computer and a medium-sized and small-sized liquid crystal panel display device for in-vehicle car navigation. Is also applicable.
In the second embodiment, a blue LED element is mounted on the light source and a white light source is used for photoexciting the phosphor. However, the LED element 5 may be mounted with a Blue element, a Green element, and a Red element. In the LED element 5, by simultaneously mounting the Blue element, the Green element, and the Red element, it is possible to adjust the white chromaticity by controlling the driving conditions, and it is possible to achieve a white correction balance. .
A light source having a predetermined white correction balance can be provided depending on the application.

14 to 21 show Embodiment 3 of the present invention.
FIG. 14 is a cross-sectional view illustrating a state in which a lens is mounted on a surface-mount package according to the third embodiment.
FIG. 15 is a cross-sectional view illustrating a state where another lens is mounted on the surface mount type package in the third embodiment.
FIG. 16 is a conceptual diagram illustrating light rays that pass through a lens mounted on a surface-mount package light source according to the third embodiment.
FIG. 17 is a conceptual diagram illustrating light rays that pass through a lens mounted on a surface-mount package light source according to the third embodiment.
FIG. 19 is a diagram illustrating an illuminating device on which the surface mount type package light source according to the third embodiment is mounted.
FIG. 20 is a diagram showing a multi-light source package in which a plurality of surface-mount package light sources according to the third embodiment are mounted.
FIG. 21 is a view showing a lighting device on which the surface mount type multi-light source package shown in FIG. 20 is mounted.

First, as a general-purpose package, a package light source as shown in the cross-sectional view of FIG.
In FIG. 14, the package light source is formed with a reflector 3 after a wiring 2 is formed on a substrate 1 made of a package or a ceramic material.
In producing these packages, it is also possible to produce them in a lump with a molding machine using the constituent materials.

  Thereafter, in order to mount and fix the element, a BlueLED element 5 as an excitation source is fixed to the base material 1 by using the die bonding material 4. Next, the Au wire 6 is used for wire connection to the element and the wiring so that conduction can be obtained.

Thereafter, a resin 7 containing a phosphor is applied and sealed around the Blue element 5, and further, a surface mount type package sealed with a transparent resin 8 is formed. Here, a white light source for photoexciting a phosphor with a Blue element is obtained.
Moreover, the shape of the transparent resin 8 to be sealed is set to a concave shape with a depressed center. Thereby, in the package, the effect of light expansion by the concave lens is obtained. Up to this point, a surface-mount package light source is manufactured in the same manner as in the first embodiment.

Next, as shown in the cross-sectional view of FIG. 14, a lens material 24 made of a transparent resin having a concave recess in the center is prepared and mounted on the package, and is bonded and fixed. At this time, a space is provided between the sealing resin 8 and the lens material 24 so that the air layer 10 having a refractive index of 1 is provided as a gap layer. Here, the air gap layer is an air layer, but any material having a low refractive index can be applied. It is assumed that the transparent material has a lower refractive index than that of the transparent resin 8 and has a configuration of a low refractive index layer having nanopores or a low refractive index layer made of airgel. The material is composed of a low refractive index layer having nanopores or an airgel low refractive index layer in which a base material is formed based on silica SiO ₂ or alumina Al ₂ O ₃ .

  The transparent resin of the lens material 9 is preferably formed of the same material as the sealed transparent resin 8. Depending on the application, the lens material 9 can be made of different transparent resins. Here, the lens material 24 is fixed immediately above the transparent resin 8 in which the LED element 5 is sealed. As shown in FIG. 14, the resin lens 24 is sealed with the reflector in accordance with the outer periphery of the reflector 3. It may be fixed to the stop resin.

The resin lens material 24 is fixed to the sealing resin 8 and the reflector 3 by thermosetting or photocuring with a transparent resin. By performing the fixing process in an evacuated environment, the air layer 10 is fixed. Is formed under reduced pressure.
The decompressed air layer 10 brings the sealing resin 8 and the reflector 3 of the package into close contact with the lens material 24, and further avoids deformation due to thermal expansion, so that the convex shape of the lower surface of the resin lens material 24 is formed. Stabilize.
The resin lens 24 has a function of reflecting and refracting the emitted light emitted in the upper surface direction in the lateral direction by totally reflecting the light intensity distribution emitted from the package light source using the inclined surface. Most of the emitted light is converted into radiation light in the lateral direction by the resin lens 24.

Next, contents for controlling the radiation distribution from the package in the present embodiment will be described below.
16 and 17 schematically illustrate the configuration of the present embodiment, and among the light intensity distributions emitted from the LED elements 5, the light intensity distribution that transmits and refracts the sealing resin 8 whose surface is set in a concave shape, In the light intensity distribution totally reflected on the concave surface on the surface of the sealing resin 8, a diagram in which light rays are traced is shown.

First, since the concave surface on the surface of the sealing resin 8 is largely refracted by the surface of the concave lens and the air layer 10, the light intensity distribution is expanded and dispersed.
In FIG. 16, a light beam that has been transmitted and refracted through the sealing resin 8 and condensed is condensed by the lower surface convex surface of the lens material 24, and the light beam that squeezes the emitted light by the upper surface convex surface of the lens material 24 is shown.
By the lens material 24, the light intensity distribution emitted from the package light source is mostly converted in the lateral direction to become a high-angle radiation distribution, and the radiation light is expanded in a wide range. By controlling the radiation distribution at a high angle, a wide range can be covered as an irradiation area.

FIG. 17 shows a traveling path of a light beam that is totally reflected on the surface of the sealing resin 8 and multiple-reflected with the reflector 3 to be guided and spread in the lateral direction.
In FIG. 17, the light emitted from the LED element 5 at a high angle is totally reflected on the surface of the sealing resin 8, and then the light is directly reflected and refracted on the side wall of the lens material 24, or The light is reflected by the concave surface of the lens material 24 while repeating multiple reflections with the reflecting surface of the reflector.

At this time, on the concave surface of the lens material 24, the condition of the slope angle of the concave surface is set so that the light beam that is guided and spread by the sealing resin 8 is totally reflected as much as possible.
Under these conditions, the size of the package, the slope of the reflector 3, the concave shape of the sealing resin, the side wall length of the lens material 24, the concave angle, and the like are control parameters.
Therefore, these are determined according to the application and design.
The radiation angle distribution can be adjusted by the design of the lens material 24. With these configurations of the present embodiment, it is realized that the emission light of the low angle and the high angle of the LED element 5 has a radiation distribution mostly in an oblique direction or a high angle direction of the lens material.
Thereby, since the emitted light of the LED element is efficiently coupled with respect to the oblique direction or the high angle direction of the package, both the control of the radiation distribution and the improvement of the light utilization efficiency can be achieved.

  By applying the lens material 24 and the air layer 10 of the present embodiment, it is shown that the radiation distribution can be controlled to be enlarged by expanding the light even in the case of a concave lens. In FIG. 18, when the lens material 24 is mounted, the radiation distribution is measured and evaluated for comparison with and without the air layer 10. Here, the radiation distribution of the package to be a concave lens before mounting the lens material 24 is also shown. By mounting the lens material 24, which is a concave lens, from the radiation distribution before mounting the lens material 24, a radiation distribution in which the angular distribution becomes both is achieved.

Here, first, the radiation distribution is measured and evaluated with respect to the configuration in which the air layer 10 is provided, and then the air layer 10 is embedded with the same transparent resin material, so that there is no air layer 10 with the same package light source. The result of measuring and evaluating the radiation distribution for the configuration is shown. From the result of FIG. 18, it can be seen that by providing the air layer 10, the concave lens of the lens material 24 has a function of expanding the radiated light, and the angular distribution can be further expanded. The degree to which the angle distribution is expanded can be controlled by the shape of the lower surface of the lens material 24 and the thickness, width and shape of the air layer or the low refractive index layer as the gap layer.
In general, the thicker the air layer or the low refractive index layer as the gap layer and the wider the width, the wider the radiation distribution can be obtained.

FIG. 19 shows an example in which the package light source of this embodiment is applied to a lighting device.
In FIG. 19, by mounting the package light source shown in FIGS. 14 and 15 on the housing 12 of the lighting device having the reflecting plate 11, a lighting device having a radiation distribution expanded to a high angle is realized. Yes.

FIG. 20 shows an illumination device in which a plurality of BlueLED elements are mounted and a long multi-light source is used.
20, in the longitudinal cross-sectional direction, it is manufactured in the same manner as the package light source on which the single element shown in FIGS. 14 and 15 is mounted, but in the cross-sectional direction, it is configured as shown in FIG.
In FIG. 20, a plurality of elements are mounted and mounted in the horizontal direction, a phosphor-containing resin is applied and sealed, and then a transparent resin and a lens material 9 are mounted to constitute a multi-light source. This long multi-light source constitutes a line light source.

FIG. 21 shows an illumination device formed in the same manner as FIG. When a multi-light source is mounted as shown in FIG. 21, an illumination device having a narrowed radiation distribution as a line light source is realized.
In the third embodiment, the configuration of the package and the lens is designed for the light emitted from the LED element 5, thereby realizing both the radiation distribution control of the package light source and the improvement of the light utilization efficiency.
By applying the package light source shown in the third embodiment, an illumination device of a point light source or a line light source is realized.
By applying the package light source of the third embodiment, a light source illumination device in which the irradiation area is expanded to a high angle is realized.
Then, by designing the package and the lens according to the application and controlling the negative focal length of the concave lens, it is possible to realize the light source of the illumination device that expands the irradiation area within a predetermined range.

In the third embodiment, a blue LED element is mounted on the light source and a white light source is used to photoexcite the phosphor. However, for the LED element 5, a blue element, a green element, and a red element can be mounted.
Regarding the LED element 5, by simultaneously mounting the Blue element, the Green element, and the Red element, the white chromaticity can be adjusted and the white correction balance can be achieved by controlling the driving conditions. . A light source having a predetermined white correction balance can be provided depending on the application.

22 to 26 show Embodiment 4 of the present invention.
In Example 4, a backlight light source module for a liquid crystal display device is provided.
FIG. 22 is a cross-sectional view of the backlight light source module according to the fourth embodiment.
FIG. 23 is a plan view showing the backlight light source module and the liquid crystal panel in the fourth embodiment.
FIG. 24 is a plan view showing the backlight light source module and the liquid crystal panel in the fourth embodiment.
FIG. 25 is a cross-sectional view illustrating a backlight light source module and a liquid crystal panel in Example 4.
FIG. 26 is a plan view showing a configuration of a liquid crystal television mounted with a surface-mount package light source according to the fourth embodiment.

In the fourth embodiment, a light source module for direct type backlight is configured as the backlight system.
Hereinafter, the configuration of the direct type light source module will be described.

FIG. 22 is a schematic view showing a part of the direct type backlight light source module.
In FIG. 22, first, the light source module 25 manufactured with the configuration of the third embodiment is prepared.
In FIG. 22, the base material 1 is designed to correspond to the configuration of the direct type backlight, and the wiring pattern and mounting are set to correspond to the configuration.
A reflective sheet 16 and a large number of light source modules 25 are mounted on the optical system support housing 15 for the backlight, and a backlight light source module is composed of an optical system 27 composed of a diffusion plate and an optical sheet. ing.
In the backlight light source module, the entire optical system 27 is covered in terms of luminance and chromaticity by light rays having a radiation angle distribution expanded from the light source module at a high angle.

FIG. 23 shows a case where the single light source package 29 is mounted on the backlight housing 28.
FIG. 24 shows a case where a long light source package 30 is mounted on the backlight housing 28.
Thus, the light source package mounted on the backlight housing 28 is made to correspond in accordance with the purpose and driving conditions. For example, in the area control of a liquid crystal display device, it is possible to cope with the degree of contrast improvement and low power consumption by the number of divisions and driving.

FIG. 25 shows a cross section of the entire backlight light source module and the liquid crystal panel.
In the manufacture of the module, the backlight light source module 31 as a whole, a diffusion plate 32, a diffusion sheet 33, a prism sheet 34, a polarization reflection sheet 35, and a thin film transistor-mounted liquid crystal panel 36 including an upper and lower polarizing plate are formed.
FIG. 26 shows an entire set configuration of a large-sized liquid crystal television including a backlight light source housing module 37, a drive circuit 38, and a large-sized liquid crystal panel 39.

With the configuration of Example 4, the backlight light source has a uniform irradiation area in a wider range than the conventional surface mount type package by suppressing the bright spot of the package and expanding the radiation angle distribution to a high angle. It can be set as a light source.
Furthermore, it is possible to cope with area control of the liquid crystal display by driving individual light source modules independently or in combination.
Thereby, the low power operation of the liquid crystal display is realized.
In addition, the number of packages and the shape of the sealing resin can be appropriately set depending on the size of the liquid crystal display device, so that the luminance and chromaticity can be made uniform throughout the backlight.
By design, uniform brightness and chromaticity can be realized with as few package light sources as possible.

Example 4
Not only can it be applied as a liquid crystal panel display device and a backlight module for a large television, but it can also be applied to a liquid crystal panel for a personal computer and a medium-sized and small-sized liquid crystal panel display device for in-vehicle car navigation. .

In the fourth embodiment, a blue LED element is mounted on the light source and a white light source that photoexcites the phosphor is used. However, the LED element 5 may be mounted with a blue element, a green element, and a red element.
Regarding the LED element 5, by simultaneously mounting the Blue element, the Green element, and the Red element, the white chromaticity can be adjusted and the white correction balance can be achieved by controlling the driving conditions. . A light source having a predetermined white correction balance can be provided depending on the application.

  The present invention can be applied as a backlight light source module for a light source module of a lighting device, a liquid crystal display device for a large-sized liquid crystal television, a small-sized liquid crystal display device for a mobile phone or a personal computer.

1 is a cross-sectional view illustrating a configuration of a surface mount type package light source according to Embodiment 1. FIG. It is sectional drawing which shows the state which mounted the lens in the surface mount type package light source shown in FIG. It is sectional drawing which shows the state which mounted another lens in the surface mount type package light source shown in FIG. It is sectional drawing which shows the state which mounted another lens on the surface mount type package light source shown in FIG. It is a conceptual diagram which shows the light ray which passes the lens mounted in the surface mount type package light source shown in FIG. It is a conceptual diagram which shows the light ray which passes the lens mounted in the surface mount type package light source shown in FIG. It is a figure which shows the radiation angle distribution by the presence or absence of a space | gap layer of the surface mount type package light source shown in FIG. It is a figure which shows the illuminating device which mounts the surface mount type package light source shown in FIG. It is a figure which shows the multi light source package which mounts a plurality of surface mount type package light sources shown in FIG. It is a figure which shows the illuminating device which mounts the surface mount type multi-light source package shown in FIG. 7 is a cross-sectional view illustrating a configuration of a package light source of a sidelight type backlight according to Embodiment 2. FIG. FIG. 12 is a cross-sectional view of the liquid crystal panel in a state where the surface mount type package light source illustrated in FIG. 11 is mounted. FIG. 6 is a top view showing a backlight light source module and a liquid crystal panel in Embodiment 2. 10 is a cross-sectional view illustrating a state where a lens is mounted on a surface-mount package in Example 3. FIG. 6 is a cross-sectional view showing a state where another lens is mounted on a surface mount type package in Embodiment 3. FIG. FIG. 10 is a conceptual diagram showing light rays that pass through a lens mounted on a surface-mount package light source in Example 3. FIG. 10 is a conceptual diagram showing light rays that pass through a lens mounted on a surface-mount package light source in Example 3. FIG. 10 is a diagram illustrating a radiation angle distribution according to the presence or absence of a void layer of a surface mount type package light source in Example 3. It is a figure which shows the illuminating device which mounts the surface mount type package light source in the present Example 3. FIG. It is a figure which shows the multi light source package which mounts several surface mount type package light sources in the present Example 3. FIG. It is a figure which shows the illuminating device which mounts the surface mount type multi-light source package shown in FIG. FIG. 10 is a cross-sectional view of a backlight light source module in Example 4. 6 is a plan view showing a backlight light source module and a liquid crystal panel in Example 4. FIG. 6 is a plan view showing a backlight light source module and a liquid crystal panel in Example 4. FIG. It is sectional drawing which shows the backlight light source module and liquid crystal panel in Example 4. FIG. 10 is a plan view illustrating a configuration of a liquid crystal television on which a surface mount type package light source according to a fourth embodiment is mounted.

Explanation of symbols

1 …………………… Base material 2 made of resin mold material or ceramic material …………………… Wiring pattern 3 …………………… Reflector 4 ………………… … Die bond material 5 …………………… LED element 6 …………………… Au wire 7 …………………… Phosphor 8 …………………… Transparent resin 9 …… ……………… Resin lens material 10 ……………… Air layer 11 ……………… Lighting device housing 12 ……………… Reflector 13 ……………… Light source package cross section 14 ……………… Multi light source package cross section 15 ……………… Backlight optical system support housing 16 ……………… Reflective sheet 17 …………………… Light guide plate 18 ............... Diffusion sheet 19 ............... Diffusion sheet 20 ............... Prism sheet 21 …………………… Polarization reflection sheet 22… ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… Resin lens material 25 ………………… Single light source Package cross section 26 ……………… Multi-light source package cross section 27 ……………… Optical system 28 composed of a diffusion plate and an optical sheet …………………… Backlight housing 29 ……………… ... Single light source package upper surface 30 ............... Multiple light source package upper surface 31 ............... Direct type backlight light source module 32 ............... …… Diffusion plate 33 …………………… Diffusion Sheet 34.... Prism sheet 35..... Polarized reflection sheet 36..... Thin-film transistor-equipped liquid crystal panel 37 including upper and lower polarizing plates 37. …………… ... drive circuit 39 ..................... large-sized liquid crystal display panel

Claims (8)

A surface-mount type package having a base material, wiring formed on the base material, a plurality of light emitting diode LED elements connected to the wiring, and a transparent resin and a reflector for sealing the plurality of LED elements In the light source,
The transparent resin is formed with a concave surface at a position lower than the height of the package reflector,
An air layer is provided on the transparent resin,
A resin material lens material is placed on the package and bonded and fixed via the air layer. The lens material has a convex surface shape on the lower surface, and the surface shape of the upper surface of the lens material allows the surface-mounted radiation. An illumination device comprising: a package light source having a lens material configuration for narrowing an angular distribution to a low angle range or converting it to a radiation angle distribution expanded to a high angle range. The lower surface of the lens material to be mounted on the package has a convex surface shape, and in the configuration in which the convex surface shape is provided on the upper surface of the lens material, it has a radiation angle distribution narrowed down to a low angle range. And
2. The illumination device according to claim 1, further comprising: a lens material having a radiation angle distribution that is expanded to a high angle range in a configuration in which a concave shape is provided on an upper surface of the lens material. The package is
The lighting device according to claim 1, wherein the LED element is mounted with one or a plurality of LED elements. The package light source is
Composed of white light source,
The configuration of the package light source mounted on the substrate is as follows:
A plurality of blue LED elements, and at least a configuration comprising a phosphor-containing resin that seals the blue LED elements;
The lighting device according to claim 3, wherein the blue LED elements are arranged in the shape of the straight line and have a configuration of the lens material. The package light source is
It is composed of red, green and blue RGB light sources,
The configuration of the package light source mounted on the substrate is as follows:
Each of a plurality of red, green and blue LED elements and a transparent resin for sealing the plurality of LED elements,
The red, green and blue LED elements are
The lighting device according to claim 3, wherein the lighting device is arranged in a straight line shape and has a configuration of the lens material. In claim 1,
A liquid crystal display device, wherein the package light source is mounted on a liquid crystal display device and used as a backlight light source module of a direct type liquid crystal display device or as a side light type backlight light source module. In claim 6,
The lens material mounted on the package includes:
A configuration in which a convex shape is provided on the upper surface, and the package light source including the lens material having a radiation angle distribution narrowed down to a low angle range is used as a sidelight type backlight light source module, Liquid crystal display device. In claim 2,
The lens material mounted on the package includes:
A liquid crystal having a configuration in which a concave shape is provided on an upper surface, wherein the package light source on which the lens material having a radiation angle distribution expanded to a high angle range is mounted is used as a direct backlight light source module. Display device.

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