TW201629385A - Area source device, liquid crystal display device and electronic device - Google Patents

Abstract

The invention provides an area source device, a liquid crystal display device and an electronic device. A gap with a regulated distance is formed between a light exit part of a light source and a light incident face of a light guiding plate. The area source device is provided with a light guiding plate and a light source. A lateral part of the light guiding plate is provided with a light incident face. A light exit part equipped with emergent light is arranged on a surface of a regulated outer surface of an encapsulation part. The light source is configured to be in a way that the light exit part is opposite to the incident face of the light guiding plate. The area source device is characterized in that the light source is provided with a gap forming unit which is capable of forming a gap with a regulated distance between the light exit part and the light incident face of the light guiding plate.

Description

Surface light source device, liquid crystal display device, and electronic device

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

As for the display device of an electronic device, a liquid crystal display device is used. In recent years, a surface light source device using a Light Emitting Diode (LED; light emitting diode) as a light source has been utilized as a backlight of a liquid crystal display device. The LED used in the surface light source device includes a light exiting portion that allows light to pass through, such as a fluorescent material. The light emitted from the LED is emitted to the outside through the light exiting portion. The light emitted from the LED enters the light guide plate from the light incident surface on the side surface of the light guide plate, and is guided to the light exit surface of the light guide plate while being totally reflected inside the light guide plate. The light guide plate is also known as the Light Guide.

In the LED used in the surface light source device, the light-emitting portion is housed in a package member having an opening in the front surface, and the light-emitting portion is housed in a recessed manner with respect to the opening of the package member. Therefore, even if the LED and the light guide plate are disposed in close contact with each other, the light-emitting portion of the LED is directly in contact with the light guide plate. In addition, the light-emitting portion is formed as a concave portion with respect to the opening of the package member, so that an appropriate air layer can be interposed between the light-emitting portion of the LED and the light-incident surface of the light guide plate (see Patent Document 1 and Patent Document 2 below). ).

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Laid-Open Patent Publication No. 2006-278122

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2012-237826

In a surface light source device to which high brightness is desired, it is required to mount an LED at a narrow pitch. In an edge light type surface light source device, in order to increase the brightness, conventional techniques allow a large number of LEDs to be arranged over a plurality of sides of a frame. However, in recent years, in order to achieve miniaturization and a larger display area, there is a demand for a narrow frame which further narrows the frame width. Therefore, it is necessary to concentrate on one side of the bezel to configure more LEDs at a narrower pitch.

Thus, in order to be able to configure more LEDs at a narrower pitch, the miniaturization of LEDs continues to develop. Among the LEDs developed for the purpose of miniaturization, there are LEDs in which the size of the package member is reduced and the light-emitting portion is exposed on the outside of the package member. When such an LED is disposed in close contact with the light guide plate, the light exit portion is in contact with the light incident surface of the light guide plate. As a result, there is a flaw in the light department. Further, since the light-emitting portion is in contact with the light-incident surface of the light guide plate, there is no air layer inter-layer between the light-emitting portion and the light-incident surface of the light guide plate. Due to the absence of an air layer, light of a high angle component that is not totally reflected in the light guide plate is incident on the light guide plate. In this way, the light of the high-angle component is not totally reflected in the light guide plate, and the light is emitted to the light-emitting surface of the light guide plate, and the brightness of the surface light source device is lowered. In view of the above, an object of the present invention is to form a gap between a light-emitting portion and a light-incident surface of a light guide plate at a predetermined distance between the light-emitting portions exposed to the outer surface of the package member.

In order to solve the above problem, the following means are employed in the present invention. That is, the present invention is a surface light source device as follows.

A surface light source device according to the present invention includes a light guide plate having a light incident surface on a side thereof, and a light source that is provided on a surface of a predetermined outer surface of the package member, and the light exit portion is coupled to the light guide plate. The light-incident surface is disposed in a relatively vertical manner; the surface light source device is characterized in that the light source has a gap forming means capable of forming a gap between the light-emitting portion and the light-incident surface of the light guide plate by a predetermined distance.

According to the surface light source device of the present invention, the light source has a gap forming means capable of forming a gap between the light-emitting portion and the light-incident surface of the light guide plate at a predetermined distance, and can be formed between the light-emitting portion and the light-incident surface of the light guide plate. The gap between the predetermined distances. As described above, according to the present invention, it is possible to suppress a decrease in the luminance of the surface light source device using the light source that is provided on the surface of the predetermined outer surface by the light exiting portion.

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

The gap forming means includes a protruding portion formed on the light-incident surface of the light guide plate and formed on the light-emitting portion of the light guide portion, and the protruding portion abuts on the light-incident surface of the light guide plate, and the light-emitting portion and the light guide plate A gap is formed between the light incident surfaces by a predetermined distance.

According to the invention as described above, it is formed in the package structure by The protrusion protruding from the light-emitting portion toward the light-incident surface side of the light guide plate is inserted into the light surface, and a gap of a predetermined distance can be formed between the light-emitting portion and the light-incident surface of the light guide plate.

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

A light source is provided with a terminal for mounting the light source to the substrate; the gap forming means has a protrusion formed at the terminal and protruding toward the light incident surface side of the light guide plate from the light exit portion, and the protrusion portion abuts the light guide plate The light incident surface forms a gap between the light exiting portion and the light incident surface of the light guide plate by a predetermined distance.

According to the invention as described above, the light-emitting portion and the light guide plate can be incident on the light-incident surface of the light guide plate by the projection portion which is formed at the terminal and protrudes toward the light-incident surface side of the light guide plate from the light-emitting portion. A gap is formed between the faces at a predetermined distance.

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

The gap forming means has a projection formed on the light-emitting portion of the light source and protruding toward the light-incident surface of the light guide plate, and the projection portion abuts on the light-incident surface of the light guide plate, and the light-emitting portion and the light-incident surface of the light guide plate A gap is formed between the predetermined distances.

According to the above aspect of the invention, the projection portion that is formed on the light-emitting portion and protrudes toward the light-incident surface side of the light guide plate abuts on the light-incident surface of the light guide plate, and can be formed between the light-emitting portion and the light-incident surface of the light guide plate. The gap between the predetermined distances.

In addition, the surface light source device of the present invention may have the following feature.

The light source is fixed to a base member on a surface different from the surface having the light-emitting portion, and the gap forming means has a protrusion formed integrally with the base member and the base member and protruding toward the light-incident surface side of the light guide plate from the light-emitting portion. By causing the protrusion to abut against the light incident surface of the light guide plate, a gap of a predetermined distance is formed between the light exit portion and the light incident surface of the light guide plate.

According to the invention as described above, by forming the projection portion fixed to the base member and integrally formed with the base member against the light incident surface of the light guide plate, a predetermined distance can be formed between the light exit portion and the light incident surface of the light guide plate. gap.

Further, the surface light source device of 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 exit portion, and the gap forming means has a protrusion formed separately from the base member and protruding toward the light incident surface side of the light guide plate from the light exit portion. By causing the protrusion to abut against the light incident surface of the light guide plate, a gap of a predetermined distance is formed between the light exit portion and the light incident surface of the light guide plate.

According to the invention as described above, it is possible to form a predetermined portion between the light exit portion and the light incident surface of the light guide plate by abutting the protrusion portion fixed to the base member and different from the base member to abut the light incident surface of the light guide plate. The gap between the distances.

According to the invention, it is possible to form a gap of a predetermined distance between the light exit portion of the light source and the light incident surface of the light guide plate. In this way, the present invention is capable of suppressing the use of the light exiting portion that emits light on a predetermined outer surface. The surface of the light source is reduced in brightness of the surface light source device.

100, 100a, 100b, 100c, 100d, 100e, 100f‧‧‧ LED

101, 101a, 101b‧‧‧ package components

102‧‧‧ openings

102a‧‧‧End

103, 103a, 103b‧‧‧ fluorescent materials

104, 104a, 104b‧‧‧ terminals

105‧‧‧ air layer

110‧‧‧FPC substrate

111‧‧‧Substrate

170, 170a, 170b, 170c, 170d‧‧‧ protruding parts

200‧‧‧Light guide plate

202‧‧‧Into the glossy surface

203‧‧‧Glossy surface

4‧‧‧ Backlight

5‧‧‧LCD display

6‧‧‧Smart mobile phone

Fig. 1 is a perspective view showing an example of an LED of a first comparative example.

Fig. 2 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 of the first comparative example.

Fig. 3 is an example of an enlarged view of a portion where the LED and the light guide plate are in contact with each other.

Fig. 4 is a view showing an example of an LED of a second comparative example.

Fig. 5 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 of the second comparative example.

Fig. 6 is an example of an enlarged view of a portion where the LED and the light guide plate are in contact with each other.

Fig. 7 is a view showing an example of arrangement of an LED and a light guide plate in the surface light source device of the embodiment.

Fig. 8 is a view showing an example of a portion where the LED and the light guide plate face each other in the surface light source device of the embodiment.

Fig. 9 is an example of an enlarged view of a portion where the LED and the light guide plate face each other.

Fig. 10 is a view showing an example of a luminance comparison chart of the surface light source device of Comparative Example 2 and the surface light source device of the embodiment.

Fig. 11 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 of the first embodiment.

Fig. 12 (A) to (C) are diagrams showing variations of the LED of the first embodiment.

Fig. 13 is a perspective view showing an example of the LED of the first embodiment.

Fig. 14 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 of the second embodiment.

Fig. 15 is a view showing an example of the LED of the second embodiment.

Fig. 16 is a perspective view showing an example of the LED of the second embodiment.

Fig. 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 of the third embodiment.

Fig. 18 (A) to (C) are diagrams showing changes in the LED of Example 3.

Fig. 19 is a perspective view showing an example of the LED of the third embodiment.

Fig. 20 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 of the fourth embodiment.

Fig. 21 is a view showing an example of the LED of the fourth embodiment.

Fig. 22 is a perspective view showing an example of the LED of the fourth embodiment.

Fig. 23 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 of the fifth embodiment.

Fig. 24 is a view showing an example of the LED of the fifth embodiment.

Fig. 25 is a perspective view showing an example of the LED of the fifth embodiment.

Fig. 26 is a view showing an example of a configuration of a liquid crystal display (display) using the surface light source device of the present invention as a backlight.

Fig. 27 is a view showing an example of a smart phone having a liquid crystal display.

Hereinafter, embodiments of the present invention will be described based on the drawings. The embodiments described below are merely examples of the invention, and are not intended to limit the invention to the specific configurations described below. In carrying out the invention, it is preferred to adopt a specific configuration according to the embodiment as appropriate.

<First Comparative Example>

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

Fig. 1 is a perspective view showing an example of the LED 100 of the first comparative example. The LED 100 includes a package member 101, a fluorescent material 103, and a terminal 104. Although not shown in the first drawing, the LED 100 is provided with an LED element, and the light emitted from the LED element is emitted to the outside through the dielectric material 103. In the LED described below, the direction in which light is emitted is the front direction, and the opposite side in the direction is the rear direction. Further, in the LED, the longitudinal direction of the LED is the horizontal direction and the thickness direction is the vertical direction.

The package member 101 is an outer package of the LED 100. The package member 101 physically protects the LED 100. An opening portion 102 is provided in the front surface 102a of the package member 101. The light of the LED 100 is emitted from the opening 102 to the outside.

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

The fluorescent material 103 is a member that utilizes a fluorescent phenomenon caused by light emitted from an LED element of the LED 100. The fluorescent material 103 is housed in the opening 102 so as to be concave (formed as a concave portion) with respect to the front surface 102a provided in the opening portion 102 of the sealing member 101. The LED 100 emits light obtained by mixing the light generated by the fluorescent material of the fluorescent material 103 and the light from the LED element passing through the fluorescent material 103.

Fig. 2 is a view showing the surface light source device 300 of the first comparative example. A diagram of an example of the peripheral portion of the LED 100 and the light guide plate 200. The fluorescent material 103 of the LED 100 is disposed to face the light incident surface 202 of the light guide plate 200. The light emitted from the LED 100 is incident on the light guide plate 200 from the light incident surface 202. The light incident from the light incident surface 202 is guided to the light exit surface 203 by the light guide plate 200. Further, on the light-emitting surface 203 of the light guide plate 200, a Brightness Enhancement Film (BEF) sheet 301 for collecting light emitted from the light-emitting surface 203 is provided. Hereinafter, in the present specification, the direction perpendicular to the light-emitting surface 203 and toward the BEF sheet 301 is the front direction of the surface light source device 300.

In the surface light source device 300, the light from the LED 100 is guided to the light-emitting surface 203 by the light guide plate 200, and the light guided to the light-emitting surface 203 is collected by the BEF sheet 301, thereby being surface-emitting. light source.

In the light guide plate 200, the light from the LED 100 that enters the light from the light incident surface 202 is diffused to the entire light guide plate 200 by total reflection in the light guide plate 200. In the light guide plate 200, a portion that destroys the total reflection condition of the light is partially disposed, whereby the light reflected inside the light guide plate 200 is guided to the light exit surface 203.

The BEF sheet 301 collects light that is emitted from the light-emitting surface 203 of the light guide plate 200 toward the front surface of the surface light source device 300. By collecting light by the BEF sheet 301, the brightness of the surface light source device 300 is increased.

Fig. 3 is an example of an enlarged view of a portion 90 where the LED 100 and the light guide plate 200 are in contact with each other in Fig. 2 . The LED 100 is in contact with the light incident surface 202 of the light guide plate 200 at the front surface 102a. The fluorescent material 103 is provided so as to be formed in a concave portion with respect to the front surface 102a. Therefore, the phosphor material 103 is not in contact with the light incident surface 202 of the light guide plate 200, and the phosphor material 103 and the light guide plate 200 are The air layer 105 is interposed.

In the first comparative example, the fluorescent material 103 of the LED 100 and the light guide plate 200 are not in direct contact. Therefore, the fluorescent material 103 of the LED 100 is not damaged by the light guide plate 200. Further, the arrow drawn in FIG. 3 shows an example of the traveling direction of the light emitted from the LED 100. In the first comparative example, the light emitted from the LED package 100 is refracted by the air layer 105 and incident on the light incident surface 202 at an incident angle that is totally reflected in the light guide plate 200.

<Second Comparative Example>

In the surface light source device 300 of the first comparative example, the LED 100 in which the fluorescent material 103 is housed in the opening 102 of the package member 101 is used as the light source. In the surface light source device of the second comparative example, an LED in which a fluorescent material is provided on the front surface of the package member is used as a light source. The same components as those in the first comparative example are denoted by the same reference numerals, and the description thereof will not be repeated. Hereinafter, a second comparative example will be described with reference to the drawings.

Fig. 4 is a view showing an example of an LED 100a in which a fluorescent material 103a is provided in front of a 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 sealing 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 to the substrate. The terminal 104a is provided at both ends of the LED 100a in the lateral direction. In the LED 100a, for example, electric power is supplied from the terminal 104a.

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

The fluorescent material 103a is different from the fluorescent material 103 in that it is provided in front of the package member 101a.

Fig. 5 is a view showing an example of a peripheral portion of the LED 100a and the light guide plate 200 in the surface light source device 300a of the second comparative example. As shown in the example shown in FIG. 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 incident surface 202 of the light guide plate 200.

Fig. 6 is an example of an enlarged view of the contact portion 90a of the LED 100a and the light guide plate 200 in Fig. 5. Unlike the LED 100 of the first comparative example, in the LED 100a of the second 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 incident surface 202 of the light guide plate 200. As a result, the second comparative example has the flaw of the fluorescent material 103a.

An example of the traveling direction of the light emitted from the LED 100a is shown by an arrow in Fig. 6. In Comparative Example 2, the light emitted from the LED 100a was directly incident on the light incident surface 202 without passing through the air layer. As a result, light that is not totally reflected in the light guide plate 200 is incident on the light guide plate 200, and the brightness of the surface light source device 300a is lowered.

<<Implementation>>

In the surface light source device of the embodiment, the LED 100a used in the second comparative example is used as the light source. In the embodiment, a gap of a predetermined distance is formed between the phosphor material 103a and the light incident surface 202 of the light guide plate 200 by the gap forming means. The same components as those in the first comparative example or the second comparative example are denoted by the same reference numerals, and the description thereof will not be repeated. Hereinafter, an embodiment will be described with reference to the drawings.

Fig. 7 is a view showing an example of the arrangement of the LED 100a and the light guide plate 200 in the surface light source device 300b of the embodiment. In Fig. 7, the LEDs 100a are mounted on a plurality of flexible printed circuits (FPC) 110. The LED 100a is mounted to the FPC substrate 110 underneath. The fluorescent material 103a of the LED 100a is disposed to face the light incident surface 202 of the light guide plate 200. The light emitted from the LED 100a passes through the light incident surface 202 and enters the light guide plate 200. The LED 100a and the light incident surface 202 of the light guide plate 200 are formed with a gap of a predetermined distance by the gap forming means described in the first to seventh embodiments to be 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 board 110 is an example of the "substrate" of the present invention.

Fig. 8 is a view showing an example of a portion where the LED 100a and the light guide plate 200 face each other in the surface light source device 300b of the embodiment. As shown in the example shown in FIG. 8, in the surface light source device 300b of the embodiment, the air layer 105 is interposed between the phosphor material 103a and the light incident surface 202 of the light guide plate 200.

Fig. 9 is an example of an enlarged view of a portion 90b of the LED 100a facing the light guide plate 200 in Fig. 8 . The fluorescent material 103a of the LED 100a is not in contact with the light incident surface 202 of the light guide plate 200, and is formed with a gap of a predetermined distance. As a result of forming a gap of a predetermined distance, an air layer 105 is interposed between the phosphor material 103a and the light incident surface 202 of the light guide plate 200. In the ninth diagram, an example of the direction in which the light emitted from the LED 100a is directed is indicated by an arrow. The light emitted from the LED 100a passes through the air layer 105 and enters the light guide plate 200 from the light incident surface 202. By refracting through the air layer 105, from the LED 100a The emitted light is incident on the light incident surface 202 at an incident angle that is totally reflected by the light guide plate 200.

Fig. 10 is a view showing an example of a luminance comparison chart 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 of Fig. 10 represents the brightness, and the graph of Fig. 10 is a relative chart with the brightness of the "air layer" of 100. In Fig. 10, the measurement results of the surface light source device 300b of the embodiment, which is indicated as "the air layer", are indicated as "the airless layer", and the measurement results of the surface light source device 300a of the second comparative example are shown.

Referring to the graph of Fig. 10, it is understood that the brightness of the surface light source device 300b of the embodiment in which the air layer 105 is interposed between the phosphor material 103a and the light incident surface 202 of the light guide plate 200 is higher than that of the phosphor material 103a and the light guide plate. The surface light source device 300a of the second comparative example in which no air layer is interposed between the light incident surfaces 202 of 200 has high luminance.

In the embodiment, a gap of a predetermined distance is formed between the phosphor material 103a and the light incident surface 202 of the light guide plate 200 by the gap forming means. Therefore, the non-fluorescent material 103a is injurious due to contact with the light guide plate 200.

Further, as a result of forming a gap of a predetermined distance, in the surface light source device 300b of the embodiment, the air layer 105 is interposed between the phosphor material 103a and the light incident surface 202 of the light guide plate 200. According to the embodiment, even if the air layer 105 is interposed, even if the LED 100a having the fluorescent material 103a provided on the front surface of the package member 101a is used as the light source, the high-intensity surface light source device 300b can be provided. In addition, the predetermined distance between the phosphor material 103a and the light incident surface 202 of the light guide plate 200 is in addition to the close contact state. The near is better.

The specific configuration in which the gap between the fluorescent material 103a and the light incident surface 202 of the light guide plate 200 is formed at a predetermined distance in the above-described embodiment will be described with reference to the following first to fifth embodiments.

<Example 1>

In the first embodiment, a protruding portion formed on the package member that houses the LED and protrudes toward the light incident surface 202 side from the phosphor material is provided. The gap forming means of the first embodiment forms a gap between the phosphor material and the light incident surface 202 of the light guide plate 200 by a predetermined distance by the protrusion portion abutting against the light surface 202. Hereinafter, the first embodiment will be described with reference to the drawings.

Fig. 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 of the first embodiment. Fig. 12 is a diagram illustrating a change of the LED 100b. Fig. 13 is a perspective view showing an example of the LED 100b. The surface light source device 300c includes an LED 100b, a light guide plate 200, and an FPC board 110.

The LED 100b is different from the LED 100a in that it has a protruding portion 170 formed on the package member 101b and protruding toward the light incident surface 202 side of the fluorescent material 103a. The protruding portion 170 can be formed in various shapes as long as it protrudes toward the light incident surface 202 side of the fluorescent material 103a. In FIGS. 12(A) and (B), the protruding portion 170 is formed by forming the sealing member 101b in a U shape. In Fig. 12(C), the protruding portion 170 is formed at both ends in the lateral direction of the fluorescent material 103a by a member different from the sealing member 101b. The protruding portion 170 is formed to protrude toward the light incident surface 202 side of the fluorescent material 103a. When the LED 100b is placed in contact with the light guide plate 200, the protruding portion 170 is abutted against the light surface 202. Therefore, in the fire A gap of a predetermined distance is formed between the light material 103a and the light incident surface 202 of the light guide plate 200. The protruding portion 170 is an example of the "protrusion portion formed on the package member and protruding toward the light-incident surface side from the light-emitting portion" of the present invention.

In the first embodiment, the protrusions 170 formed on the package member 101b of the LED 100b and protruding toward the light-incident surface 202 side of the phosphor material 103a are in contact with the light-emitting surface 202, so that the fluorescent material 103a and the guide can be used. A gap of a predetermined distance is formed between the light incident surfaces 202 of the light plate 200.

<Example 2>

In the second embodiment, a protruding portion that protrudes toward the light incident surface 202 side of the phosphor material is provided at the terminal attached to 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 incident surface 202 of the light guide plate 200 by the protruding portion abutting the light surface 202. Hereinafter, the second embodiment will be described with reference to the drawings.

Fig. 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 of the second embodiment. Fig. 15 is a view showing an example of the LED 100c. Fig. 16 is a perspective view showing an example of the LED 100c. The surface light source device 300d includes an LED 100c, a light guide plate 200, and an FPC board 110.

The LED 100c is different from the LED 100a in that it has a protruding portion 170a formed on the terminal 104b and protruding toward the light incident surface 202 side of the fluorescent material 103a. When the LED 100c is placed in contact with the light guide plate 200, the protruding portion 170a is abutted against the light surface 202. Therefore, a gap of a predetermined distance is formed between the fluorescent material 103a and the light incident surface 202 of the light guide plate 200. The protruding portion 170a is an example of the "protrusion portion formed on the terminal and protruding toward the light-incident surface side from the light-emitting portion" of the present invention.

In the second embodiment, the fluorescent material 103a and the light guide plate can be formed by the protruding portion 170a formed on the terminal 104b of the LED 100c and protruding toward the light incident surface 202 side of the fluorescent material 103a. A gap of a predetermined distance is formed between the light incident faces 202 of 200.

<Example 3>

In the third embodiment, the phosphor of the LED is provided with a protruding portion that protrudes toward the light incident surface 202 side. The gap forming means of the third embodiment forms a gap of a predetermined distance between the fluorescent material 103a and the light incident surface 202 of the light guide plate 200 by the protruding portion abutting the light surface 202. Hereinafter, the third embodiment will be described with reference to the drawings.

Fig. 17 is a view 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 of the third embodiment. Fig. 19 is a perspective view showing an example of the LED 100d. The surface light source device 300e includes an LED 100d, a light guide plate 200, and an FPC board 110.

The LED 100d is different from the LED 100a in that it has a protruding portion 170b formed on the side of the fluorescent material 103b and protruding toward the light incident surface 202 side. When the LED 100d is placed in contact with the light guide plate 200, the protruding portion 170b is abutted against the light surface 202. Therefore, a gap of a predetermined distance is formed between the fluorescent material 103b and the light incident surface 202 of the light guide plate 200. The protruding portion 170b is an example of the "projecting portion formed on the light-emitting portion and protruding toward the light-incident surface side" of the present invention.

The protruding portion 170b can be formed into various shapes as long as a part of the fluorescent material 103b protrudes into the light-incident surface 202. Fig. 18 is a view showing a change of the LED 100d of the embodiment 3. In Fig. 18(A), the phosphor material 103b is formed in a convex shape and is opposed to the light incident surface 202. The central portion of the surface of the fluorescent material 103b serves as a protruding portion 170b. Further, in Fig. 18(B), the fluorescent material 103b is formed in a concave shape, and the end portion of the fluorescent material 103b is a protruding portion 170b. In Fig. 18(C), the fluorescent material 103b is formed in a U shape, and the end of the fluorescent material 103b is a protruding portion 170b.

In the third embodiment, the light entering the light surface 202 by the protruding portion 170b formed on the fluorescent material 103b of the LED 100d and protruding toward the light incident surface 202 side enables the light entering the fluorescent material 103b and the light guide plate 200. A gap of a predetermined distance is formed between the faces 202.

<Example 4>

In the fourth embodiment, the substrate of the LED is provided with a protruding portion which is formed integrally with the substrate and protrudes toward the light incident surface 202 side of the fluorescent material 103a. The gap forming means of the fourth embodiment forms a gap of a predetermined distance between the fluorescent material 103a and the light incident surface 202 of the light guide plate 200 by the protruding portion abutting the light surface 202. Hereinafter, the fourth embodiment will be described with reference to the drawings.

Fig. 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 of the fourth embodiment. Fig. 21 is a view showing an example of the LED 100e. Fig. 22 is a perspective view showing an example of the LED 100e. The surface light source device 300f includes an LED 100e, a light guide plate 200, and an FPC board 110.

The LED 100e is different from the LED 100a in that it has the protruding portion 170c. The protruding portion 170c is formed integrally with the substrate 111 and protrudes toward the light incident surface 202 side of the fluorescent material 103a. When the LED 100e is placed in contact with the light guide plate 200, the protruding portion 170c is abutted against the light surface 202. Therefore, a gap of a predetermined distance is formed between the fluorescent material 103a and the light incident surface 202 of the light guide plate 200. The substrate 111 is the "base member" of the present invention. An example. The protruding portion 170c is an example of the "projecting portion in which the base member and the base member are integrally formed and protrudes toward the light-incident surface side from the light-emitting portion".

In the fourth embodiment, the fluorescent material 103a and the light guide plate can be formed by the protruding portion 170c formed on the substrate 111 of the LED 100e and protruding toward the light incident surface 202 side of the fluorescent material 103a. A gap of a predetermined distance is formed between the light incident faces 202 of 200.

<Example 5>

In the fifth embodiment, the substrate of the LED is provided with a protruding portion that protrudes toward the light incident surface 202 side of the fluorescent material 103a by a member different from the substrate. The members of the protruding portion can be made of various materials such as resin, metal, and rubber. The gap forming means of the fifth embodiment forms a gap of a predetermined distance between the phosphor material 103a and the light incident surface 202 of the light guide plate 200 by the protrusion portion abutting the light surface 202. Hereinafter, the fifth embodiment will be described with reference to the drawings.

Fig. 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 of the fifth embodiment. Fig. 24 is a view showing an example of the LED 100f. Fig. 25 is a perspective view showing an example of the LED 100f. The surface light source device 300g includes an LED 100f, a light guide plate 200, and an FPC board 110.

The LED 100f is different from the LED 100a in that it has the protruding portion 170d. The protruding portion 170d is formed separately from the substrate 111. The protruding portion 170d is fixed to the substrate 111 and protrudes toward the light incident surface 202 side of the fluorescent material 103a. When the LED 100f is placed in contact with the light guide plate 200, the protruding portion 170d is abutted against the light surface 202. Therefore, in the fluorescent material 103a A gap is formed between the light incident surface 202 of the light guide plate 200 and a predetermined distance. The protruding portion 170d is an example of the "protrusion portion in which the base member is formed separately from the base member and protrudes toward the light-incident surface side from the light-emitting portion".

In the fifth embodiment, the fluorescent material 103a and the light guide plate can be formed by the protruding portion 170d formed on the substrate 111 of the LED 100f and protruding toward the light incident surface 202 side of the fluorescent material 103a. A gap of a predetermined distance is formed between the light incident faces 202 of 200.

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

<Used on liquid crystal display>

A display device such as a liquid crystal display including the above-described surface light source device of the present invention as a backlight can be provided. Fig. 26 is a perspective view showing the configuration of a liquid crystal display using the surface light source device of the present invention as the backlight 4. The main part of the liquid crystal display 5 is shown in Fig. 26. The liquid crystal display 5 is configured by overlapping a liquid crystal panel 50 on a light-emitting surface of the backlight 4 described above.

The liquid crystal panel 50 is a display panel that receives light emitted from the backlight 4 and applies a voltage to the liquid crystal 51 to control the increase or decrease of the light transmittance, thereby displaying an image. The liquid crystal panel 50 is formed by sandwiching a liquid crystal 51 between glass plates 52a and 52 and sandwiching a pair of polarizing plates 53a and 53b. The light emitted from the backlight 4 is in accordance with the polarizing plate 53a and the glass plate 52a. The order of the liquid crystal 51, the glass plate 52b, and the polarizing plate 53b passes through the respective components.

The liquid crystal display 5 constructed as described above is expected to have a small size, a narrow bezel, and a higher brightness.

<Used in electronic devices>

Further, it is possible to provide an electronic device such as a smart phone, a digital camera, or a tablet terminal device having the liquid crystal display 5 described above. Fig. 27 is a view showing an example of the smartphone 6 including the liquid crystal display 5. Electronic devices such as the smart phone 6 are expected to provide a higher quality display.

100b‧‧‧LED

110‧‧‧FPC substrate

200‧‧‧Light guide plate

202‧‧‧Into the glossy surface

300c‧‧‧ surface light source device

Claims (8)

A surface light source device comprising: a light guide plate having a light incident surface on a side thereof; and a light source configured to provide a light exiting portion that emits light on a surface of a predetermined outer surface of the package member, and the light exiting portion is guided by the light guide portion The light incident surface of the light plate is disposed to be opposed to each other. The surface light source device is characterized in that the light source has a gap forming means capable of forming a gap between the light exit portion and the light incident surface by a predetermined distance. The surface light source device according to claim 1, wherein the gap forming means has a protrusion formed on the package member and protrudes toward the light incident surface side from the light exit portion; and the protrusion portion abuts the light incident surface A gap is formed between the light-emitting portion and the light-incident surface by a predetermined distance. The surface light source device according to claim 1, wherein the light source is provided with a terminal for mounting the light source to the substrate; and the gap forming means has a terminal formed on the terminal and protrudes toward the light incident surface side from the light emitting portion. a protrusion; a gap formed between the light-emitting portion and the light-incident surface by a predetermined distance by causing the protrusion to abut against the light-incident surface. The surface light source device according to claim 1, wherein the gap forming means has a protrusion formed on the light-emitting portion and protruding toward the light-incident surface; and the protrusion portion abuts the light-incident surface in the light-emitting portion A gap is formed between the light incident surface and the aforementioned light incident surface by a predetermined distance. The surface light source device of claim 1, wherein the foregoing light source is in front of a surface on which the surface of the light portion is different is fixed to the base member, and the gap forming means includes a protrusion formed integrally with the base member and protruding toward the light-incident surface side of the light-emitting portion; The protruding portion abuts against the light incident surface, and a gap is formed between the light emitting portion and the light incident surface by a predetermined distance. The surface light source device of claim 1, wherein the light source is fixed to the base member on a surface different from a surface having the light exit portion; the gap forming means has a base member separately formed from the base member and is more than the foregoing The light-emitting portion further protrudes toward the light-incident surface side; and the protrusion portion abuts the light-incident surface to form a gap between the light-emitting portion and the light-incident surface at a predetermined distance. A liquid crystal display device comprising the surface light source device according to any one of claims 1 to 6 as a backlight. An electronic device characterized by comprising the liquid crystal display device of claim 7.