KR20160045557A - Surface light source device, liquid crystal display device, and electronic apparatus - Google Patents

Abstract

The present invention relates to a surface light source device. A gap of a predetermined distance is formed between a light emission portion of a light source and a light incident surface of a light guide plate. The light guide plate having the light incident surface on a side thereof and the light emission portion emitting light are prepared on an external surface of a package member. The light emission portion is arranged to correspond to the light incident surface of the light guide plate in the light source. The surface light source device has the light source. The light source has a gap forming unit capable of forming a gap of a predetermined distance between the light emission portion and the light incident surface of the light guide plate.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a surface light source device, a liquid crystal display device, and an electronic device,

The present invention relates to a surface light source device, a liquid crystal display device, and an electronic device.

A liquid crystal display device is used as a display device of an electronic device. In recent years, a surface light source device employing a light emitting diode (LED) as a light source has been used as a backlight of a liquid crystal display device. The LED used in the surface light source device is provided with a light emitting portion that transmits light such as a fluorescent material. The light emitted from the LED is emitted to the outside through the light emitting portion. The light emitted from the LED is incident on the light guide plate from the light incident surface on the side surface of the light guide plate, and is totally reflected in the light guide plate and guided to the light exit surface of the light guide plate. The light guide plate is also referred to as a light guide.

In the LED used in the conventional surface light source device, the light emitting portion is housed in a package member having an opening in the front face, and the light emitting portion is housed to be recessed with respect to the opening portion of the package member. Therefore, even when the LED and the light guide plate are arranged so as to be in close contact with each other, there is less concern that the light emitting portion of the LED directly comes into contact with the light guide plate. Further, since the light emitting portion is a concave portion with respect to the opening portion of the package member, it is possible to interpose an appropriate air layer between the light emitting portion of the LED and the light incoming surface of the light guide plate (see Patent Documents 1 and 2).

Patent Document 1: JP-A 2006-278122 Patent Document 2: JP-A-2012-237826

In a surface light source device expected to have a high brightness, mounting of LEDs at a narrow pitch is required. In the edge light type surface light source device, conventionally, it is allowed to arrange a large number of LEDs over a plurality of sides of a frame in response to a demand for high brightness. In recent years, however, in order to realize a larger display area with a smaller size, there is a demand for narrowing the frame width to a narrower width. Therefore, it is required to concentrate on one side of the frame and arrange more LEDs at a narrower pitch.

Therefore, miniaturization of LEDs is progressing in order to enable the arrangement of more LEDs at a narrower pitch. Among the LEDs developed for the purpose of miniaturization, the size of the package member is reduced, and the light emitting portion is exposed on the outer surface of the package member. When the LED is arranged so as to come into close contact with the light guide plate, the light emitting portion comes into contact with the light entrance surface of the light guide plate. As a result, there is a fear that a light emitting portion is scratched. In addition, since the light-exiting portion is in contact with the light-entering surface of the light guide plate, an air layer is not interposed between the light-exiting portion and the light-entering surface of the light guide plate. As the air layer does not intervene, light of a high angle (high angle) component that is not totally reflected in the light guide plate is incident on the light guide plate. As a result, the light of a high angle component is not totally reflected in the light guide plate, but is output without being guided to the light exit surface of the light guide plate, and the brightness of the surface light source device may be lowered. Therefore, in the present invention, it is an object of the present invention to form a clearance of a predetermined distance between the light emitting portion of the LED and the light incident surface of the light guide plate, in the LED whose light emitting portion is exposed on the outer surface of the package member.

In order to solve the above problems, the present invention adopts the following means. That is, the present invention is the following surface light source device.

And a light source arranged such that a light emitting portion of the package member is provided on a surface of a predetermined outer surface of the package member and the light emitting portion is opposed to the light incident surface of the light guide plate, Has a gap forming means for forming a gap of a predetermined distance between the light emitting portion and the light incoming surface of the light guide plate.

According to the surface light source device of the present invention, since the light source has the gap forming means for forming a gap of a predetermined distance between the light emitting portion and the light incident surface of the light guide plate, A gap of a predetermined distance can be formed. As a result, according to the present invention, it is possible to suppress a decrease in the luminance of the surface light source device employing the light source in which the light emitting portion from which the light is emitted is provided on the surface of the predetermined outer surface.

Further, the surface light source device according to the present invention may have the following features.

The gap forming means has protrusions formed on the package member of the light source and protruding toward the light incident surface side of the light guide plate from the light emitting portion. The protrusion portions abut on the light incident surface of the light guide plate, A gap of a predetermined distance is formed.

According to this invention, a protruding portion formed on the package member and protruding toward the light-incoming surface of the light guide plate is brought into contact with the light-incoming surface of the light guide plate, so that a gap of a predetermined distance can be formed between the light- have.

Further, the surface light source device according to the present invention may have the following features.

The light source is provided with a terminal for mounting the light source on the substrate. The gap forming means has a protrusion formed on the terminal and protruding toward the light-entering surface of the light guide plate than the light-emitting portion. By contacting the protrusion on the light- A gap of a predetermined distance is formed between the light emitting portion and the light incoming surface of the light guide plate.

According to this invention, a protruding portion formed on the terminal and protruding toward the light-entering surface of the light guide plate is made to contact the light-incoming surface of the light guide plate, so that a gap of a predetermined distance is formed between the light- .

Further, the surface light source device according to the present invention may have the following features.

The gap forming means has protrusions formed on the light emitting portion of the light source and protruding toward the light incident surface of the light guide plate. The protrusion portion abuts on the light incident surface of the light guide plate, .

According to the present invention, a gap of a predetermined distance can be formed between the light emitting portion and the light incidence surface of the light guide plate by contacting the protruding portion formed on the light emitting portion and protruding toward the light entrance surface of the light guide plate .

Further, the surface light source device according to the present invention may have the following features.

The light source is fixed to the base member on a surface different from the surface having the light emitting portion. The gap forming means has a protruding portion integrally formed with the base member on the base member and projecting to the light incoming surface side of the light guide plate from the light emitting portion, The protruding portion is brought into contact with the light incidence surface to form a gap of a predetermined distance between the light exiting portion and the light incidence surface of the light guide plate.

According to this aspect of the invention, a protrusion of a predetermined distance can be formed between the light-exiting portion and the light-incoming surface of the light guide plate by contacting the protruding portion fixed to the base member and formed integrally with the base member to the light-

Further, the surface light source device according to the present invention may have the following features.

The light source is fixed to the base member on a surface different from the surface having the light emitting portion, and the gap forming means has a protruding portion formed separately from the base member on the base member and projecting to the light incoming surface side of the light guide plate from the light emitting portion, The protruding portion is brought into contact with the light incidence surface to form a gap of a predetermined distance between the light exiting portion and the light incidence surface of the light guide plate.

According to the present invention, a gap of a predetermined distance can be formed between the light emitting portion and the light incidence surface of the light guide plate by contacting the projection portion fixed to the base member and formed separately from the base member to the light entrance surface of the light guide plate.

According to the present invention, a gap of a predetermined distance can be formed between the light emitting portion of the light source and the light incoming surface of the light guide plate. As a result, according to the present invention, it is possible to suppress a decrease in the luminance of the surface light source device employing the light source in which the light emitting portion from which the light is emitted is provided on the surface of the predetermined outer surface.

1 is a perspective view showing an example of an LED according to a first comparative example;
2 is a view showing an example of a portion where the LED and the light guide plate contact with each other in the surface light source device according to the first comparative example.
3 is an example of an enlarged view of a portion where the LED and the light guide plate contact each other.
4 is a diagram showing an example of LEDs according to a second comparative example;
5 is a view showing an example of a portion where the LED and the light guide plate contact with each other in the surface light source device according to the second comparative example.
6 is an example of an enlarged view of a contact portion between the LED and the light guide plate.
7 is a view showing an example of the arrangement of an LED and a light guide plate in the surface light source device according to the embodiment;
8 is a view showing an example of a portion facing the LED and the light guide plate in the surface light source device according to the embodiment;
9 is an example of an enlarged view of a portion where the LED and the light guide plate face each other.
10 is a graph showing an example of a graph for comparing luminance between the surface light source device according to Comparative Example 2 and the surface light source device according to the embodiment;
11 is a view showing an example of a portion where the LED and the light guide plate contact with each other in the surface light source device according to Embodiment 1. Fig.
12 is a diagram exemplifying variations of LEDs according to Example 1. Fig.
13 is a perspective view showing an example of an LED according to Example 1. Fig.
14 is a view showing an example of a portion where the LED and the light guide plate contact with each other in the surface light source device according to the second embodiment;
15 is a view showing an example of an LED according to the second embodiment;
16 is a perspective view showing an example of the LED according to the second embodiment;
17 is a view showing an example of a portion where the LED and the light guide plate are in contact with each other in the surface light source device according to Example 3. Fig.
18 is a diagram showing variation of the LED according to the third embodiment;
19 is a perspective view showing an example of an LED according to Example 3. Fig.
20 is a view showing an example of a portion where the LED and the light guide plate contact with each other in the surface light source device according to the fourth embodiment;
21 is a diagram showing an example of an LED according to Example 4. Fig.
22 is a perspective view showing an example of an LED according to Example 4. Fig.
23 is a view showing an example of a portion where the LED and the light guide plate contact with each other in the surface light source device according to Example 5. Fig.
24 is a view showing an example of an LED according to Example 5. Fig.
25 is a perspective view showing an example of an LED according to Example 5. Fig.
26 is a diagram showing an example of the configuration of a liquid crystal display in which the surface light source device according to the present invention is employed as a backlight;
27 is a view showing an example of a smart phone having a liquid crystal display;

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the embodiments described below represent an example of carrying out the present invention and are not intended to limit the present invention to the specific configurations described below. In carrying out the present invention, it is preferable that a specific configuration according to the embodiment is appropriately adopted.

≪ Comparative Example 1 >

In the surface light source device according to the first comparative example, an LED in which a fluorescent material is accommodated is used as a light source in the opening of the package member. Hereinafter, a first comparative example will be described with reference to the drawings.

1 is a perspective view showing an example of an LED 100 according to a first comparative example. The LED 100 includes a package member 101, a fluorescent material 103, and a terminal 104. Although not shown in Fig. 1, the LED 100 includes an LED element, and the light emitted from the LED element is emitted to the outside through the fluorescent material 103. Fig. In the LED described below, a direction in which light is emitted is referred to as a forward direction (forward direction), and a direction opposite to the direction is referred to as a backward direction. In the LED, the longitudinal direction of the LED is referred to as the transverse direction, and the thickness direction is referred to as the vertical direction.

The package member (101) is an exterior of the LED (100). The package member (101) physically protects the LED (100). An opening 102 is provided in the front surface 102a of the package member 101. [ Light from the LED 100 is emitted from the opening 102 toward the outside.

The terminal 104 is a terminal for mounting the LED 100 on the substrate. The terminals 104 are provided at both ends of the LED 100. [ In the LED 100, for example, power is supplied from the terminal 104. [

The fluorescent material 103 is a member that utilizes the fluorescence phenomenon by the light emitted from the LED element provided in the LED 100. [ The fluorescent material 103 is accommodated in the opening portion 102 so as to be recessed (recessed) with respect to the front surface 102a of the opening portion 102 provided in the package member 101. [ The LED 100 emits light mixed with light from the fluorescent material 103 and light from the LED device that has passed through the fluorescent material 103.

2 is a diagram showing an example of peripheral portions of the LED 100 and the light guide plate 200 in the surface light source device 300 according to the first comparative example. The fluorescent material 103 of the LED 100 is arranged so as to face the light incoming surface 202 of the light guide plate 200. [ Light emitted from the LED (100) enters the light guide plate (200) from the light incidence plane (202). The light incident from the light incidence surface 202 is guided to the light exiting surface 203 by the light guiding plate 200. A Brightness Enhancement Film (BEF) sheet 301 for condensing the light emitted from the light exiting surface 203 is provided on the light exiting surface 203 of the light guide plate 200. Hereinafter, the direction perpendicular to the light exiting surface 203 and toward the BEF sheet 301 is referred to as the front direction of the surface light source device 300 in this specification.

The surface light source device 300 guides the light from the LED 100 to the light exit surface 203 by the light guide plate 200 and condenses the light guided to the light exit surface 203 by the BEF sheet 301 And becomes a light source that emits light in a plane.

The light from the LED 100 incident on the light incidence plane 202 spreads throughout the light guide plate 200 by total internal reflection in the light guide plate 200. [ In the light guide plate 200, the light reflected in the light guide plate 200 is guided to the light exiting surface 203 by providing a portion that partially collapses the condition for total reflection of light.

The BEF sheet 301 condenses the light emitted from the light exiting surface 203 of the light guide plate 200 toward the front surface of the surface light source device 300. By being condensed by the BEF sheet 301, the brightness of the surface light source device 300 is improved.

3 is an example of an enlarged view of a portion 90 where the LED 100 and the light guide plate 200 contact in FIG. The LED 100 is in contact with the light incidence surface 202 of the light guide plate 200 at the front surface 102a. The fluorescent material 103 is provided so as to be recessed with respect to the front surface 102a. The fluorescent material 103 does not contact the light incidence surface 202 of the light guide plate 200 and the air layer 105 is interposed between the fluorescent material 103 and the light guide plate 200. [

In the first comparative example, the fluorescent material 103 of the LED 100 and the light guide plate 200 are not in direct contact with each other. Therefore, the fluorescent material 103 of the LED 100 does not become scratched by the light guide plate 200. The arrows shown in Fig. 3 show an example of the traveling direction of the emitted light from the LED 100. Fig. In the first comparison example, the light emitted from the LED package 100 is refracted by the air layer 105 and is incident on the light incidence surface 202 at an incident angle totally reflected in the light guide plate 200.

≪ Comparative Example 2 >

The surface light source device 300 according to the first comparative example employs the LED 100 in which the fluorescent material 103 is accommodated in the opening 102 of the package member 101 as a light source. In the surface light source device according to the second comparative example, an LED provided with a fluorescent material on the entire surface of the package member is employed as the light source. The same components as those in the first comparative example are denoted by the same reference numerals, and redundant description is omitted. Hereinafter, a second comparative example will be described with reference to the drawings.

4 is a diagram showing an example of the LED 100a provided with the fluorescent material 103a on the entire surface of the package member 101a. The LED 100a includes a package member 101a, a fluorescent material 103a, a terminal 104a, and a substrate 111. [ In the LED 100a, the size of the package member 101a is smaller than that of the LED 100 of the first comparative example. In the LED 100a of the second comparative example, the package member 101a has no opening, and the fluorescent material 103a is exposed on the front surface of the package member.

The terminal 104a is a terminal for mounting the LED 100a on the substrate. The terminals 104a are provided at both ends in the lateral direction of the LED 100a. In the LED 100a, for example, power is supplied from the terminal 104a.

The substrate 111 is provided on the rear surface of the LED 100a. The width of the substrate 111 is wider than the width of the fluorescent material 103a.

The fluorescent material 103a differs from the fluorescent material 103 in that the fluorescent material 103a is provided on the front surface of the package member 101a.

5 is a diagram showing an example of peripheral portions of the LED 100a and the light guide plate 200 in the surface light source device 300a according to the second comparative example. 5, in the surface light source device 300a of the second comparative example, the fluorescent material 103a of the LED 100a is in contact with the light incidence surface 202 of the light guide plate 200, as shown in Fig.

6 is an enlarged view of a contact portion 90a between the LED 100a and the light guide plate 200 in Fig. In the LED 100a of the second comparative example, unlike the LED 100 of the first comparative example, the fluorescent material 103a is exposed on the front surface of the package member 101a. Therefore, the fluorescent material 103a is in contact with the light incidence surface 202 of the light guide plate 200. [ As a result, in the second comparative example, the fluorescent material 103a may be scratched.

In Fig. 6, an example of the traveling direction of light emitted from the LED 100a is indicated by an arrow. In Comparative Example 2, the light emitted from the LED 100a enters the light incidence surface 202 directly without using an air layer. As a result, light that does not totally pass through the light guide plate 200 is incident on the light guide plate 200, which may lower the brightness of the surface light source device 300a.

≪ Embodiment >

In the surface light source device according to the embodiment, the LED (100a) used in the second comparative example is employed as the light source. A gap of a predetermined distance is formed between the fluorescent material 103a and the light incidence surface 202 of the light guide plate 200 by the gap forming means. The same components as those of the first comparative example or the second comparative example are denoted by the same reference numerals, and redundant description is omitted. Hereinafter, embodiments will be described with reference to the drawings.

7 is a diagram showing an example of the arrangement of the LED 100a and the light guide plate 200 in the surface light source device 300b according to the embodiment. In Fig. 7, a plurality of LEDs 100a are mounted on flexible printed circuits (FPC) 110. Fig. The LED 100a is mounted on the FPC board 110 on the lower surface thereof. The fluorescent material 103a of the LED 100a is disposed so as to face the light incidence plane 202 of the light guide plate 200. [ The light emitted from the LED 100a passes through the light incidence surface 202 and enters the light guide plate 200. [ The gap between the LED 100a and the light incidence surface 202 of the light guide plate 200 is formed at a predetermined distance by the gap forming means described in Examples 1 to 7 described later. The LED 100a is an example of the " light source " of the present invention. The fluorescent material 103a is an example of the "light emitting portion" of the present invention. The FPC substrate 110 is an example of the " substrate " of the present invention.

Fig. 8 is a diagram showing an example of a portion of the surface light source device 300b according to the embodiment facing the LED 100a and the light guide plate 200. Fig. 8, an air layer 105 is interposed between the fluorescent material 103a and the light incidence surface 202 of the light guide plate 200 in the surface light source device 300b of the embodiment .

9 is an enlarged view of a portion 90b of the LED 100a in FIG. 8 and the light guide plate 200 facing each other. The fluorescent material 103a of the LED 100a does not contact the light incidence surface 202 of the light guide plate 200 and a gap of a predetermined distance is formed. The air gap 105 is interposed between the fluorescent material 103a and the light incidence surface 202 of the light guide plate 200 as a result of the formation of a gap of a predetermined distance. In Fig. 9, an example of the traveling direction of light emitted from the LED 100a is indicated by an arrow. Light emitted from the LED (100a) enters the light guide plate (200) from the light incoming surface (202) via the air layer (105). The light emitted from the LED 100a is refracted by the air layer 105 and is incident on the light incidence surface 202 at an incident angle totally reflected by the light guide plate 200. [

10 is a diagram showing an example of a graph for comparing the luminance of the surface light source device 300a of the second comparative example and the surface light source device 300b of the embodiment. The vertical axis in Fig. 10 shows the luminance, and the graph in Fig. 10 is a relative graph in which the luminance in the case of "with air layer" is 100. 10 shows the measurement result of the surface light source device 300b of the embodiment and the description of "no air layer" is the same as the surface light source device 300a of the second comparative example ).

10, the planar light source device 300b of the embodiment in which the air layer 105 is interposed between the fluorescent material 103a and the light incidence surface 202 of the light guide plate 200, It can be seen that the luminance is higher than that of the surface light source device 300a of the second comparative example in which no air layer exists between the light incident surface 103a of the light guide plate 200 and the light incident surface 202 of the light guide plate 200. [

A gap of a predetermined distance is formed between the fluorescent material 103a and the light incidence surface 202 of the light guide plate 200 by the gap forming means. Therefore, there is no possibility that the fluorescent material 103a is scratched by the contact with the light guide plate 200.

As a result, a gap of a predetermined distance is formed. As a result, in the surface light source device 300b according to the embodiment, the air layer 105 is interposed between the fluorescent material 103a and the light incoming surface 202 of the light guide plate 200. As a result of the interposition of the air layer 105, according to the embodiment, even when the LED 100a provided with the fluorescent material 103a on the entire surface of the package member 101a is used as the light source, the surface light source device 300b, Can be provided. It is preferable that the predetermined distance between the fluorescent material 103a and the light incidence surface 202 of the light guide plate 200 is as small as possible except for the close state.

Specific constructions for forming a gap of a predetermined distance between the fluorescent material 103a and the light incidence surface 202 of the light guide plate 200 in the embodiment described above will be described as Examples 1 to 5 below.

<Example 1>

In Embodiment 1, a protrusion formed on the package member for housing the LED and protruding toward the light incidence surface 202 than the fluorescent material is provided. The gap forming means of the first embodiment forms a gap of a predetermined distance between the fluorescent material and the light incidence surface 202 of the light guide plate 200 as the projection comes into contact with the light incidence surface 202. Hereinafter, the first embodiment will be described with reference to the drawings.

11 is a view showing an example of a portion where the LED 100b and the light guide plate 200 are in contact with each other in the surface light source device 300c according to the first embodiment. 12 is a diagram exemplifying variation of the LED 100b. 13 is a perspective view showing an example of the LED 100b. The surface light source device 300c has an LED 100b, a light guide plate 200, and an FPC substrate 110. [

The LED 100b differs from the LED 100a in that the LED 100b has a protrusion 170 formed on the package member 101b and protruding toward the light incidence surface 202 rather than the fluorescent material 103a. The protrusion 170 can be formed in various shapes as long as it protrudes toward the light incidence surface 202 rather than the fluorescent material 103a. In Figs. 12A and 12B, the package member 101b is formed in a C-shape, so that the protrusion 170 is formed. In Fig. 12 (c), protruding portions 170 are formed by members different from the package member 101b at both ends in the transverse direction of the fluorescent material 103a. The protrusion 170 protrudes toward the light incidence surface 202 rather than the fluorescent material 103a. When the LED 100b and the light guide plate 200 are arranged to be in contact with each other, the protrusion 170 is brought into contact with the light incidence plane 202. Therefore, a gap of a predetermined distance is formed between the fluorescent material 103a and the light incidence surface 202 of the light guide plate 200. [ The projecting portion 170 is an example of the &quot; projecting portion formed on the package member and protruding toward the light-entering surface from the light-emitting portion &quot; of the present invention.

The protruding portion 170 formed on the package member 101b of the LED 100b and protruding toward the light incidence surface 202 from the fluorescent material 103a is in contact with the light incidence surface 202 so that the fluorescent material 103a And the light incidence plane 202 of the light guide plate 200 can be formed at a predetermined distance.

<Practical Example 2>

In Embodiment 2, a protruding portion protruding toward the light incidence surface 202 side of the fluorescent material is provided on the terminal mounted on the LED. The gap forming means of the second embodiment forms a gap of a predetermined distance between the fluorescent material 103a and the light incidence surface 202 of the light guide plate 200 as the projection comes into contact with the light incidence surface 202. [ Hereinafter, the second embodiment will be described with reference to the drawings.

14 is a view showing an example of a portion where the LED 100c and the light guide plate 200 are in contact with each other in the surface light source device 300d according to the second embodiment. Fig. 15 is a diagram showing an example of the LED 100c. 16 is a perspective view showing an example of the LED 100c. The surface light source device 300d has an LED 100c, a light guide plate 200, and an FPC substrate 110. [

The LED 100c differs from the LED 100a in that the LED 100c has a protrusion 170a formed on the terminal 104b and protruding toward the light incoming surface 202 rather than the fluorescent material 103a. When the LED 100c and the light guide plate 200 are arranged to be in contact with each other, the projection 170a abuts the light incidence plane 202. [ Therefore, a gap of a predetermined distance is formed between the fluorescent material 103a and the light incidence surface 202 of the light guide plate 200. [ The projecting portion 170a is an example of the &quot; projecting portion formed on the terminal and protruding toward the light-entering surface from the light-emitting portion &quot; of the present invention.

The protrusion 170a formed on the terminal 104b of the LED 100c and projecting toward the light incidence surface 202 rather than the fluorescent material 103a is brought into contact with the light incidence surface 202, And the light incidence plane 202 of the light guide plate 200 can be formed.

&Lt; Example 3 >

In Example 3, a protruding portion protruding toward the light incidence surface 202 is provided in the fluorescent material of the LED. The gap forming means of Embodiment 3 forms a gap of a predetermined distance between the fluorescent material 103a and the light incidence surface 202 of the light guide plate 200 by contacting the projecting portion to the light incidence surface 202. [ Hereinafter, the third embodiment will be described with reference to the drawings.

17 is a diagram showing an example of a portion where the LED 100d and the light guide plate 200 are in contact with each other in the surface light source device 300e according to the third embodiment. 19 is a perspective view showing an example of the LED 100d. The surface light source device 300e has an LED 100d, a light guide plate 200, and an FPC substrate 110. [

The LED 100d differs from the LED 100a in that the LED 100d has a protrusion 170b formed in the fluorescent material 103b and protruding toward the light incidence surface 202 side. When the LED 100d and the light guide plate 200 are arranged to be in contact with each other, the projection 170b abuts on the light incidence surface 202. [ Therefore, the projecting portion 170b having a gap between the fluorescent material 103b and the light incidence surface 202 of the light guide plate 200 is formed in the light emitting portion of the present invention, Quot; protrusion &quot;

The projecting portion 170b can be formed in various shapes as long as it has a shape in which a part of the fluorescent material 103b is projected toward the light incidence surface 202. [ 18 is a diagram showing variations of the LED 100d according to the third embodiment. 18A, the fluorescent material 103b is formed in a convex shape, and the central portion of the surface of the fluorescent material 103b that opposes the light incidence surface 202 is a protruding portion 170b. In Fig. 18B, the fluorescent material 103b is formed in a concave shape, and the end portion of the fluorescent material 103b is the projecting portion 170b. In Fig. 18 (C), the fluorescent material 103b is formed in a C-shape, and the end portion of the fluorescent material 103b is a protruding portion 170b.

The protruding portion 170b formed on the fluorescent material 103b of the LED 100d and projecting toward the light incoming surface 202 comes into contact with the light incoming surface 202 so that the fluorescent material 103b and the light guide plate 200 And the light incidence surface 202 of the light guide plate 202 can be formed.

<Example 4>

In Embodiment 4, a protruding portion formed integrally with the substrate on the substrate of the LED and protruding toward the light-entering surface 202 than the fluorescent material 103a is provided. The gap forming means of Embodiment 4 forms a gap of a predetermined distance between the fluorescent material 103a and the light incidence surface 202 of the light guide plate 200 by contacting the projecting portion to the light incidence surface 202. [ Hereinafter, the fourth embodiment will be described with reference to the drawings.

20 is a view showing an example of a portion where the LED 100e and the light guide plate 200 are in contact with each other in the surface light source device 300f according to the fourth embodiment. 21 is a diagram showing an example of the LED 100e. 22 is a perspective view showing an example of the LED 100e. The surface light source device 300f has an LED 100e, a light guide plate 200, and an FPC substrate 110. [

The LED 100e differs from the LED 100a in that it has a protrusion 170c. The protrusion 170c is integrally formed with the substrate 111 and protrudes toward the light incidence surface 202 rather than the fluorescent material 103a. When the LED 100e and the light guide plate 200 are disposed to be in contact with each other, the protrusion 170c abuts on the light incidence surface 202. [ Therefore, a gap of a predetermined distance is formed between the fluorescent material 103a and the light incidence surface 202 of the light guide plate 200. [ The substrate 111 is an example of the "base member" of the present invention. The projecting portion 170c is an example of the &quot; projecting portion formed integrally with the base member on the base member and protruding toward the light-incoming surface side than the light-projecting portion &quot;

The protrusion 170c formed on the substrate 111 of the LED 100e and protruding toward the light incidence surface 202 rather than the fluorescent material 103a is brought into contact with the light incidence surface 202 so that the fluorescent material 103a, And the light incidence plane 202 of the light guide plate 200 can be formed.

&Lt; Example 5 >

In Embodiment 5, a protruding portion protruding from the fluorescent material 103a toward the light incidence surface 202 side is provided by a member formed separately from the substrate on the substrate of the LED. As the member of the projection, various materials such as resin, metal, and rubber can be employed. The gap forming means of Embodiment 5 forms a gap of a predetermined distance between the fluorescent material 103a and the light incidence surface 202 of the light guide plate 200 by contacting the projecting portion to the light incidence surface 202. [ Hereinafter, the fifth embodiment will be described with reference to the drawings.

23 is a view showing an example of a portion where the LED 100f and the light guide plate 200 are in contact with each other in the surface light source device 300g according to the fifth embodiment. 24 is a diagram showing an example of the LED 100f. 25 is a perspective view showing an example of the LED 100f. The surface light source device 300g has an LED 100f, a light guide plate 200, and an FPC substrate 110. [

The LED 100f differs from the LED 100a in that it has a protrusion 170d. The projection 170d is formed separately from the substrate 111. [ The protrusion 170d is fixed to the substrate 111 and protrudes toward the light incidence surface 202 rather than the fluorescent material 103a. When the LED 100f and the light guide plate 200 are disposed to be in contact with each other, the projection 170d abuts on the light incidence plane 202. [ Therefore, a gap of a predetermined distance is formed between the fluorescent material 103a and the light incidence surface 202 of the light guide plate 200. [ The projecting portion 170d is an example of the &quot; projecting portion formed separately from the base member in the base member and protruding toward the light-entering surface from the light-emitting portion &quot; of the present invention.

The protrusion 170d formed on the substrate 111 of the LED 100f and protruding toward the light incidence surface 202 rather than the fluorescent material 103a is brought into contact with the light incidence surface 202 so that the fluorescent material 103a, And the light incidence plane 202 of the light guide plate 200 can be formed.

The embodiments and the examples described above can be variously modified. For example, the projecting portion 170d formed separately from the substrate described in Embodiment 5 may be fixed to the terminal 104a of the LED 100a. A gap of a predetermined distance can be formed between the fluorescent material 103a and the light incidence surface 202 of the light guide plate 200 by the protrusion 170d fixed to the terminal 104a.

&Lt; Application to liquid crystal display >

A display device such as a liquid crystal display having the above-described surface light source device according to the present invention as a backlight can be provided. Fig. 26 is a perspective view illustrating the configuration of a liquid crystal display in which the surface light source device according to the present invention is employed as a backlight 4. Fig. In Fig. 26, the main components of the liquid crystal display 5 are shown. The liquid crystal display 5 is constituted by overlapping the liquid crystal panel 50 on the light emitting surface of the backlight 4 described above.

The liquid crystal panel 50 is a display panel for displaying an image by receiving light emitted from the backlight 4 and applying a voltage to the liquid crystal 51 to increase or decrease the transmittance of light. The liquid crystal panel 50 is configured such that the liquid crystal 51 is sandwiched between the glass plates 52a and 52b and is enclosed by the pair of polarizing plates 53a and 53b. The light emitted from the backlight 4 passes through the components in the order of the polarizing plate 53a, the glass plate 52a, the liquid crystal 51, the glass plate 52b, and the polarizing plate 53b.

The liquid crystal display 5 structured as described above can be expected to be a small-sized, narrow-framed, and high-brightness liquid crystal display.

<Application to electronic devices>

In addition, it is possible to provide an electronic apparatus having such a liquid crystal display 5, such as a smart phone, a digital camera, and a tablet terminal. Fig. 27 is a diagram showing an example of a smart phone 6 provided with a liquid crystal display 5. Fig. An electronic device such as the smart phone 6 can be expected to provide a display of higher image quality.

100, 100a, 100b, 100c, 100d, 100e, 100f: LED
101, 101a, 101b: package member
102: opening
102a: end
103, 103a, and 103b: fluorescent material
104, 104a, 104b: terminal
105: air layer
110: FPC board
111: substrate
170, 170a, 170b, 170c, 170d:
200: light guide plate
202:
203 · exit surface
4: Backlight
5: Liquid crystal display
6: Smartphone

Claims (8)

A light guide plate having a light incidence surface on the side,
A surface light source device having a light emitting portion in which a light emitting portion from which light is emitted is provided on a surface of a predetermined outer surface of a package member and the light emitting portion is disposed so as to face the light incident surface of the light pipe,
Wherein said light source has gap forming means for forming a gap of a predetermined distance between said light emitting portion and said light incidence surface. The method according to claim 1,
Wherein the gap forming means has a projection formed on the hose holding member and protruding toward the light-entering surface from the light-
And the protruding portion is brought into contact with the light incidence surface to form a gap between the light projecting portion and the light incidence surface at a predetermined distance. The method according to claim 1,
The light source is provided with a terminal for mounting the light source on the substrate,
Wherein the gap forming means has a projection formed on the terminal and protruding toward the light-entering surface from the light-
And the protruding portion is brought into contact with the light incidence surface to form a gap between the light projecting portion and the light incidence surface at a predetermined distance. The method according to claim 1,
Wherein the gap forming means has a projection formed on the light emitting portion and protruding toward the light entrance surface,
And the protruding portion is brought into contact with the light incidence surface to form a gap between the light projecting portion and the light incidence surface at a predetermined distance. The method according to claim 1,
Wherein the light source is fixed to the base member on a surface different from the surface having the light emitting portion,
Wherein the gap forming means has a protruding portion integrally formed with the base member on the base member and projecting from the light emitting portion toward the light incoming surface,
And the protruding portion is brought into contact with the light incidence surface to form a gap between the light projecting portion and the light incidence surface at a predetermined distance. The method according to claim 1,
Wherein the light source is fixed to the base member on a surface different from the surface having the light emitting portion,
Wherein the gap forming means has a projection formed on the base member separately from the base member and protruding toward the light-entering surface side from the light-
And the projecting portion is brought into contact with the light incidence surface to form a gap of a predetermined distance between the light projecting portion and the light incidence surface. An article display device comprising the surface light source device according to any one of claims 1 to 6 as a backlight. An electronic device comprising the liquid crystal display device according to claim 7.

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