JP2003141921A - Lighting device, electro-optic unit and electronic equipment, as well as manufacturing method of lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device which can improve luminance distribution without degrading working efficiency of assembly process, an electro-optic unit using the lighting device, an electronic equipment, and a manufacturing method of the lighting device. SOLUTION: With the lighting device 10 of the electro-optic unit 100, light penetrating through a side end face 118 after traveling through a light guide plate 11 gets reflected at a transmission prevention layer 17 having microscopic concavoconvexes attached to the side end face 118 and again returns back inside the light guide plate, so that unevenness of luminance of light emitted from a surface side 111 can be eliminated. Such concavoconvexes are formed by concavoconvexes 21 attached beforehand to the inner side faces 67, 68, and 69 of a die 60 for molding the light guide plate 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illuminating device, an electro-optical unit that illuminates an electro-optical panel by the illuminating device, and an electronic apparatus including the electro-optical unit. More specifically, the present invention relates to a technique for making the luminance distribution of light emitted from the lighting device uniform.

[0002]

2. Description of the Related Art In electronic devices such as mobile phones, the display section is often composed of an electro-optical unit using an electro-optical panel such as a liquid crystal panel.

Such an electro-optical unit is, for example,
As shown in FIGS. 10A and 10B, the liquid crystal panel 400
And a lighting device 10 that can illuminate the liquid crystal panel 400 from the back side. In this electro-optical unit, the illumination device 10 includes a transparent light guide plate 11 having a rectangular planar shape, and four side end surfaces 116, 11 of the light guide plate 11.
The light source unit 14 that emits light to the side end surface 116 (light incident end surface) of the reference numerals 7, 118, and 119, and the reflecting material 12 that is arranged so as to overlap the back surface side 112 of the light guide plate 11. .

In the illuminating device 10 thus constructed, the light emitted from the light source portion 14 enters the light guide plate 11 from the side end surface 116 thereof and advances in the light guide plate 11 as indicated by an arrow L1. The light is emitted from the front surface side 111 (light emission surface) to illuminate the liquid crystal panel 400. Further, the light emitted from the back surface side 112 of the light guide plate 11 is reflected by the reflecting material 12 and again enters the light guide plate 12 from the back surface side 112 and is emitted from the front surface side 111, as indicated by an arrow L2. It

Here, the liquid crystal panel 400 can modulate the light incident from the back surface side in the process of transmitting the light to the front surface side. Therefore, an image can be displayed on the liquid crystal panel 400 by turning on or off each pixel included in the liquid crystal panel 400.

[0006]

In the electro-optical unit constructed as described above, the surface side 111 of the illumination device 10 is provided.
It is preferable that the light emitted from the device has a uniform distribution, because unevenness in brightness does not occur in an image displayed on the liquid crystal panel 400.

However, in the conventional electro-optical unit, since the side end surfaces 117, 118, and 119 of the light guide plate 12 are not subjected to any special treatment, for example, as shown in FIG. Most of the light that has arrived passes through the side end surface 118 and is not emitted from the front surface side 111, as indicated by the arrow L3 ′. Therefore, there is a problem in that there is a large variation in the brightness of the light emitted from the front surface side 111 of the light guide plate 12.

Therefore, as shown by the alternate long and short dash lines in FIGS. 10A and 10B, the side end surfaces 117, 118, 1 of the light guide plate 12 are shown.
It is conceivable to dispose the reflection plate 140 so as to face 19. According to such a configuration, as shown in FIG. 11B, the light that is about to escape from the side end surface 118 is reflected by the reflection plate 140 and again inside the light guide plate 12 as shown by an arrow L3. As described above, the variation in the brightness of the light emitted from the front surface side 111 can be eliminated.

However, the reflector 140 as shown in FIGS. 10 (A), 10 (B) and 11 (B) is installed in the illuminating device 1.
Addition to 0 is not preferable because it causes a decrease in work efficiency in the assembly process of the illumination device and the electro-optical unit.

In view of the above problems, the object of the present invention is to
An object of the present invention is to provide an illuminating device capable of improving the luminance distribution without lowering the work efficiency of the assembly process, an electro-optical unit using the illuminating device, an electronic device, and a method for manufacturing the illuminating device.

[0011]

In order to solve the above-mentioned problems, in the present invention, a light guide plate whose front surface side is a light emitting surface,
Of the side end faces of the light guide plate, in a lighting device having a light source unit that emits light toward a light incident end face, and a reflection layer arranged on the back side of the light guide plate, among the side end faces of the light guide plate. The side end faces other than the light incident end face are formed with a transmission prevention layer integrated with the side end face.

In the present invention, since the transmission prevention layer integrated with the side end face is formed on the side end faces of the light guide plate excluding the light incident end face, the light reaching this side end face is Without passing through the light guide plate, the light travels in the light guide plate again and is emitted from the front surface side. Therefore, it is possible to eliminate the brightness variation of the light emitted from the light guide plate. Further, in the present invention, since the permeation preventive layer is integrally formed with the side end surface of the light guide plate, work efficiency is not lowered in the assembly process of the lighting device and the electro-optical unit.

In the present invention, it is preferable that the permeation-preventing layer is constituted by fine irregularities provided on the side end surface of the light guide plate. According to this structure, since it is not necessary to add a new member, the transmission preventing layer can be added to the light guide plate without increasing the cost.

In the present invention, the permeation preventive layer may be a reflection sheet attached to the side end surface of the light guide plate.

When an electro-optical unit is constructed using the illuminating device according to the present invention, the light emitted from the light emitting surface of the light guide plate is optically modulated by the electro-optical material. The electro-optical panel capable of displaying an image is arranged. If liquid crystal is used as the electro-optical material, the electro-optical panel is configured as a liquid crystal panel that modulates light with liquid crystal.

In such an electro-optical unit, uniform light is incident on the electro-optical panel. Therefore, if this electro-optical unit is used as a display section of an electronic device, it is possible to display a high-quality image without unevenness in brightness.

According to the present invention, the light guide plate made of plastic having a light emitting surface on the front side, the light source portion for emitting light toward the light incident end surface of the side end surfaces of the light guide plate, and the back surface of the light guide plate. In a method of manufacturing a lighting device having a reflection layer disposed on a side, in manufacturing the light guide plate by molding in a mold, a side end surface of the light guide plate excluding the light incident end surface is included. It is characterized in that the inner surface of the mold for constituting the above is provided with fine irregularities.

According to the present invention, in a mold for resin-molding a light guide plate, of the side end faces of the light guide plate, the inner face of the mold for constituting the side end faces excluding the light incident end face is minute. Since the light guide plate is molded in this mold, since the unevenness is provided, the side end face is provided with fine unevenness, and the fine unevenness functions as a permeation preventive layer that prevents transmission of light. Therefore, it is not necessary to add any new process when manufacturing the light guide plate having the transmission prevention layer on the side end surface. Moreover, it is not necessary to add any new member. Therefore, it is possible to inexpensively manufacture the light guide plate and the lighting device provided with the transmission preventing layer.

According to the present invention, the light guide plate made of plastic whose front surface side is the light emitting surface, the light source portion for emitting light toward the light incident end surface of the side end surfaces of the light guide plate, and the back surface of the light guide plate. In a method for manufacturing a lighting device having a reflection layer disposed on a side, in manufacturing the light guide plate, after forming the light guide plate, a side end surface of the light guide plate excluding the light incident end surface. The feature is that the end face is provided with fine irregularities.

In this embodiment, the side end surface of the light guide plate after resin molding is provided with fine irregularities, and these fine irregularities function as a transmission preventing layer for preventing the transmission of light. Therefore, it is not necessary to add any new member when manufacturing the light guide plate having the transmission prevention layer on the side end surface. Therefore, it is possible to inexpensively manufacture the light guide plate and the lighting device provided with the transmission preventing layer.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the accompanying drawings.

[First Embodiment] (Overall Configuration of Electronic Device) FIG. 1 is a perspective view showing an external appearance of a mobile phone which is an example of an electronic device to which the present invention is applied. 2A and 2B are a cross-sectional view of an electro-optical unit used in this mobile phone and a plan view of an illumination device used in this electro-optical unit, respectively. In addition,
The illuminating device shown here has a basic configuration in common with that of a conventional device, and therefore, parts having common functions will be described with the same reference numerals.

In FIG. 1, the mobile phone 1 (electronic device) of the present embodiment is provided with a display unit 2 using a liquid crystal panel 400 as an electro-optical panel in the upper half thereof, and in the lower half thereof. Operation unit 3 in which a plurality of key buttons 301 are arranged
Is configured. A speaker hole 4 is formed above the display unit 2, and a microphone hole 5 is formed below the operation unit 3.

In constructing the display unit 2 in the mobile phone 1, an electro-optical unit 100 having an illuminating device 10 shown in FIGS. 2A and 2B is used. The electro-optical unit 100 is a liquid crystal. Panel 400 and illuminating device 1 capable of emitting light to the back side of liquid crystal panel 400
It is composed of 0 and 0.

(Structure of Liquid Crystal Panel 400) FIGS. 3 and 4 are a perspective view and an exploded perspective view, respectively, of the liquid crystal panel 400 when viewed obliquely from below. FIG. 5 is a sectional view of the liquid crystal panel 400.

In FIGS. 3, 4 and 5, a liquid crystal panel 400 is a passive matrix type color liquid crystal panel, and is a pair of transparent glasses made of rectangular glass and the like which are adhered by a sealing material 430 with a predetermined gap. A liquid crystal encapsulation region 435 is defined between the substrates by a sealing material 430, and liquid crystal is encapsulated in the liquid crystal encapsulation region 435. Here, of the pair of transparent substrates, the one in which the plurality of columns of the first electrode patterns 440 extending in the vertical direction in the liquid crystal encapsulation region 435 is formed is the first transparent substrate 410, and the liquid crystal encapsulation region is defined. A substrate on which a plurality of rows of second electrode patterns 450 extending in the lateral direction within 435 is formed is referred to as a second transparent substrate 420.

On the second transparent substrate 420, as shown in FIG. 5, red (R) and green (G) are formed in the regions corresponding to the intersections of the first electrode patterns 440 and the second electrode patterns 450. , Blue (B) color filters 407R, 407
G, 407B are formed, and these color filters 40
An insulating flattening film 426, a second electrode pattern 450, and an alignment film 42 on the surface side of 7R, 407G, and 407B.
2 are formed in this order. On the other hand, on the first transparent substrate 410, a first electrode pattern 440 and an alignment film 412 are formed in this order.

In the liquid crystal device 400, the second electrode pattern 450 has an ITO film (Indium Tin O 2).
xide / transparent conductive film). On the other hand, the first electrode pattern 440 is composed of a thin aluminum film, and a part of the light reaching the first electrode pattern 440 made of this thin aluminum film is the first
Of the first electrode pattern 440, and part of the light is reflected by the first electrode pattern 440. Therefore, the liquid crystal panel 400 is
It is a semi-transmissive / semi-reflective liquid crystal panel that has both a function as a transmissive liquid crystal panel and a function as a reflective liquid crystal panel. A polarizing plate 461 is attached to the outer surface of the second transparent substrate 420, and a polarizing plate 462 is attached to the outer surface of the first transparent substrate 410.

In constructing such a semi-transmissive / semi-reflective liquid crystal panel 400, the first electrode pattern 440 is formed of an aluminum film having a thickness capable of completely reflecting light, and the first electrode is formed. Of the patterns 440,
A small light transmitting hole may be formed at a portion intersecting with the second electrode pattern 450.

The first electrode pattern 440 is also made of ITO.
The liquid crystal device 400 can be configured as a transmissive type by using a film.

Referring again to FIGS. 3 and 4, in the liquid crystal panel 400, the first transparent substrate 410 and the second transparent substrate 410 are used for both inputting / outputting of signals to / from the outside and conduction between the substrates. The first terminal formation region 411 and the second terminal formation region 42 formed on the first transparent substrate 410 and the second transparent substrate 420, respectively, in the vicinity of the substrate sides 418 and 428 located in the same direction of 420.
1 is used. Here, a substrate larger than the first transparent substrate 410 is used as the second transparent substrate 420, and when the first transparent substrate 410 and the second transparent substrate 420 are bonded together, the first transparent substrate 410 is transparent. Substrate edge 41 of substrate 410
The driving IC 490 is COG-mounted on the portion 425 of the second transparent substrate 420 that projects from No. 8. Further, in the second terminal formation region 421 of the second transparent substrate 420, the input / output terminals 481 are formed in a portion located on the substrate side 421 side of the driving IC 490, and the flexible connection is made with respect to these input / output terminals 481. The board 70 is connected.

In the second terminal formation region 421, the portion located on the liquid crystal enclosing region 435 side of the driving IC 490 is used for inter-substrate conduction with the first transparent substrate 410 side, and therefore, the first portion. It is formed in an overlapping portion with the transparent substrate 410. In addition, in the first transparent substrate 410, the first terminal formation region 411 is formed in the second transparent substrate 42.
Since it is used for substrate-to-substrate conduction with the 0 side, it is formed in an overlapping portion with the second transparent substrate 420.

Therefore, the first transparent substrate 410 and the second transparent substrate 420 are sealed with the sealing material 43 containing the inter-substrate conducting agent.
When the bonding is performed at 0 to make the inter-substrate conduction terminals conductive with each other between the substrates and input a signal from the input / output terminal 481 of the second transparent substrate 420 to the drive IC 490, the drive IC 490
The signal output from is supplied to the first electrode pattern 440 and the second electrode pattern 450, and thus drives the pixels corresponding to the intersections of the first electrode pattern 440 and the second electrode pattern 450, respectively. be able to.

(Structure of Illumination Device 10) FIG.
In (B), the illumination device 10 includes a light guide plate 11 having a wedge-shaped cross section, which is made of a transparent plastic molded product, and four side end surfaces 116, 117, 118, 119 of the rectangular light guide plate 11.
Among these, the light source unit 14 that emits light to the side end surface 116 (light incident end surface), the reflecting material 12 that is arranged so as to overlap with the back surface side of the light guide plate 11, and the liquid crystal panel 400 and the front surface side of the light guide plate 11. 111 (light emission surface) and an optical sheet 15 such as a prism sheet that is arranged so as to be overlapped. Although not shown, a diffused reflection layer formed by printing white ink in a dot shape is formed at a predetermined density on the entire back surface 112 of the light guide plate 11. Here, as the light source unit 14, any structure described later with reference to FIGS. 9A, 9B, and 9C can be adopted, but here, the fluorescent tube 141 is used.
And a reflector 142 that covers the back side of the fluorescent tube 141.
The one with and is shown.

Further, in this embodiment, among the four side end surfaces 116, 117, 118, 119 of the light guide plate 11, the three side end surfaces 117, 118, 119 except the side end surface 116 are integrated with these side end surfaces. The permeation preventive layer 17 is formed.

In this embodiment, as shown in FIG. 6A in an enlarged view of the periphery of the side end surface 118 of the light guide plate 11, the permeation preventive layer 17 is provided.
Are three side end surfaces 117, 118, 119 of the light guide plate 11.
Of the side end face 1 by the diffuse reflection action.
Light that is going to escape from 17, 118, and 119 is guided by the light guide plate 1.
Reflect within 1.

(Operation / Effect of this Embodiment) In the electro-optical unit 100 having such a configuration, the liquid crystal panel 400
Is a semi-transmissive / semi-reflective type, it is possible to modulate this light in the process of reflecting external light that has entered from the surface side and emitting it from the surface side (reflection mode). It is also possible to modulate this light in the process in which the light incident from the back surface side is transmitted to the front surface side (transmission mode).

That is, in the electro-optical unit 100, the external light incident on the front surface side of the liquid crystal panel 400 is the first external light.
After being reflected by the electrode pattern 440 of the liquid crystal panel 400
While the light is emitted from the front surface side of the
Since it is modulated by 04, an image is displayed on the liquid crystal panel 400 (reflection mode).

In the electro-optical unit 100,
The light emitted from the illumination device 10 is modulated by the liquid crystal 404 in each pixel in the process of entering from the back surface side of the liquid crystal panel 400 and then exiting from the front surface side.
An image is displayed on the liquid crystal panel 400 (transmission mode).

When displaying in such a transparent mode,
In the illumination device 10, the light emitted from the light source unit 14 enters the light guide plate 11 from the side end surface 116 thereof, and then the arrow L
As shown by 1, the light travels in the light guide plate 11 away from the light source unit 14 and is emitted from the front surface side 111 thereof.

Of the light incident on the light guide plate 11, the light emitted from the rear surface side 112 of the light guide plate 11 is reflected by the reflector 12 and is again reflected on the rear surface of the light guide plate 11 as indicated by an arrow L2. The light enters from the side 112 and the surface side 11 of the light guide plate 11
It is emitted from 2.

Further, of the light traveling through the light guide plate 11,
For example, as shown in FIG. 6 (A), the light that is about to escape from the side end surface 118 is reflected by the transmission preventing layer 17 and returns to the inside of the light guide plate 12 again as indicated by an arrow L3. It is possible to eliminate the variation in the brightness of the light emitted from the side 111. Therefore, when an image is displayed on the liquid crystal panel 400 in the transmissive mode, it is possible to perform high-quality display without uneven brightness.

(Manufacturing Example 1 of Lighting Device) In the manufacturing process of the lighting device 10 having such a structure, in manufacturing the light guide plate 11, in this embodiment, as shown in FIG.
In the mold 60 for resin-molding the light guide plate 11, the inner side surface 66 for forming the side end surface 116 of the light guide plate 11 is a flat surface, but the side end surfaces 117, 118 of the light guide plate 11,
The inner surfaces 67, 68, 69 for forming the 119 are
Fine concavities and convexities 61 are formed by honing using an abrasive. Therefore, when the light guide plate 11 is molded by using the mold 60, the side end surfaces 117, 118, and 119 are provided with fine irregularities, and these fine irregularities function as the transmission preventing layer 17 that prevents the transmission of light. .

Thus, in this embodiment, the permeation preventive layer 17
Is integrally formed with the side end surfaces 117, 118, and 119 of the light guide plate 11, so that work efficiency is not reduced in the assembly process of the illumination device 10 and the electro-optical unit.

Further, when manufacturing the light guide plate 11 having the permeation preventive layer 17 on the side end surfaces 117, 118, 119, it is sufficient to form fine irregularities 61 on the mold 60, so that no new process is performed. , No need to add. In addition, the light guide plate 11 including the permeation preventive layer 17 can be manufactured without using any new member. Therefore, the light guide plate 11 and the lighting device 10 can be manufactured at low cost.

(Manufacturing Example 2 of Illumination Device) Although not shown in the drawings for manufacturing the light guide plate 11 described with reference to FIGS. 2 and 6A in the manufacturing process of the lighting device 10 of the present embodiment. , Side end surfaces 116, 117, 118, 119
After the light guide plate 11 having a flat surface is formed by resin molding, the permeation preventive layer 17 is formed on the side end surfaces 117, 118, and 119 of the light guide plate 11 by honing using an abrasive or other processing. You may form the minute unevenness which comprises.

Even when such a manufacturing method is adopted, the permeation preventive layer 17 is formed on the side end surfaces 117 and 118 of the light guide plate 11.
Since it is integrally formed with the illumination device 119, the work efficiency is not reduced in the assembly process of the illumination device 10 and the electro-optical unit.

Further, since fine irregularities may be formed on the side end surfaces 117, 118, 119, the light guide plate 1 provided with the permeation preventive layer 17 without using any new member.
1 can be manufactured. Therefore, the light guide plate 11 and the lighting device 10 can be manufactured at low cost.

[Second Embodiment] FIGS. 7A and 7B are a cross-sectional view of an electro-optical unit of the present embodiment and a plan view of an illuminating device used in this electro-optical unit. Like the electro-optical unit according to the first embodiment, the electro-optical unit shown here constitutes a display unit in an electronic device such as a mobile phone, and has the same basic configuration. Therefore, the description of the configuration of the mobile phone and the configuration of the liquid crystal panel will be omitted, and portions having common functions will be denoted by the same reference numerals.

As shown in FIGS. 7A and 7B, the electro-optical unit 100 of this embodiment also emits light to the liquid crystal panel 400 (electro-optical panel / illumination target) and the rear surface side of the liquid crystal panel 400. And a possible lighting device 10.

The illuminating device 10 is, like the first embodiment, a light guide plate 1 made of a transparent plastic molding and having a wedge-shaped cross section.
1 and four side end surfaces 116, 11 of the rectangular light guide plate 11.
7, 118, and 119, the light source unit 14 that emits light to the side end surface 116, the reflecting material 12 that is arranged so as to overlap with the back surface side of the light guide plate 11, the liquid crystal panel 400, and the light guide plate 11.
And an optical sheet 15 such as a prism sheet, which is arranged so as to be overlapped with the front surface side 111. Although illustration is omitted, a diffused reflection layer formed by printing white ink in a dot shape is formed at a predetermined density on the entire back surface 112 of the light guide plate 11.

Also in this embodiment, in the lighting device 10, the transmission preventing layer 17 'is disposed on the three side end surfaces 117, 118, 119 of the four side end surfaces of the light guide plate 11 except the side end surface 116. ing.

In this embodiment, as shown in FIG. 8A in an enlarged manner around the side end surface 118 of the light guide plate 11, the permeation preventive layer 1
Reference numeral 7'denotes three side end surfaces 117, 118, 1 of the light guide plate 11.
Each of the nineteen is formed by a bonded reflective tape 170. Here, as shown in FIG. 8 (B), the reflective tape 170 is a metal film 171 coated with a transparent adhesive material 172. As shown in FIG. 8 (C),
A metal film 171 lined with a resin film 173 coated with a transparent adhesive material 172 may be used, and in any case, the adhesive material 172 is applied to the side end surfaces 117, 118, 119 of the light guide plate 11. By doing so, the permeation preventive layer 17 ′ integrated with the side end surfaces 117, 118, 119 of the light guide plate 11 can be formed.

The electro-optical unit 10 thus configured
Even in 0, in the illuminating device 10, the light emitted from the light source unit 14 enters the light guide plate 11 from its side end surface 116 and then moves away from the light source unit 14 inside the light guide plate 11 as indicated by an arrow L1. Thus, the light is emitted from the front surface side 111 (light emitting surface).

Of the light incident on the light guide plate 11, the light emitted from the rear surface side 112 of the light guide plate 11 is reflected by the reflecting material 12 and is again reflected on the light guide plate 11 by its back surface, as indicated by an arrow L2. The light enters from the side 112 and the surface side 11 of the light guide plate 11
It is emitted from 2.

Further, of the light traveling through the light guide plate 11,
For example, as shown in FIG. 8 (A), the light attempting to escape from the side end surface 118 is reflected by the metal film 171 forming the transmission preventing layer 17 ′ again as shown by an arrow L3, and again,
Since it returns to the inside of the light guide plate 12, it is possible to eliminate the variation in the brightness of the light emitted from the front surface side 111. Therefore, when an image is displayed on the liquid crystal panel 400 in the transmissive mode, it is possible to perform high-quality display without uneven brightness.

Further, in this embodiment, since the permeation preventive layer 17 'is formed integrally with the side end surfaces 117, 118, 119 of the light guide plate 11, the work efficiency is lowered in the assembly process of the lighting device 10 and the electro-optical unit. There is nothing to do.

[Other Embodiments] First and Second Embodiments
Then, as the light source unit 14, as shown in FIGS.
Of the configuration shown in FIG. 9C, an example in which the fluorescent tube 141 and the reflector 142 are provided as shown in FIG. 9A has been described, but as shown in FIG. A light source unit 14 including a light pipe 143 and a pair of LEDs 144A and 144B that emits light toward both end surfaces of the light pipe 143 may be adopted, and as shown in FIG. 9C. The light source unit 14 in which the pair of LEDs 144A and 144B are arranged so as to face the side end surface 116 of the light guide plate 11 may be adopted.

Furthermore, in the first and second embodiments, an example in which the present invention is applied to the illumination device 10 for the passive matrix type liquid crystal panel 400 has been described, but other electro-optical panels such as an active matrix type liquid crystal panel. The present invention may be applied to a lighting device for.

In the first and second embodiments, an example in which the present invention is applied to the lighting device 10 used in the electro-optical unit 100 of the mobile phone 1 has been described, but the present invention is applied to other lighting devices. Good.

[0061]

As described above, according to the present invention, the side end faces of the light guide plate excluding the light incident end face are formed with the transmission preventing layer which is integral with the side end face. The light reaching the side end face travels inside the light guide plate again without exiting from the light guide plate, and is emitted from the front surface side. Therefore, it is possible to eliminate the brightness variation of the light emitted from the light guide plate. Further, in the present invention, the permeation preventive layer,
Since it is integrally formed with the side end surface of the light guide plate, the efficiency of the assembly process of the illumination device and the electro-optical unit is not reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an external appearance of a mobile phone which is an example of an electronic device to which the present invention is applied.

2A and 2B are respectively a cross-sectional view of an electro-optical unit according to Embodiment 1 of the present invention used in the mobile phone shown in FIG. 1 and an illumination used in this electro-optical unit. It is a top view of an apparatus.

FIG. 3 is a perspective view of a liquid crystal panel used in the mobile phone shown in FIG. 1 as seen obliquely from below.

FIG. 4 is an exploded perspective view of a liquid crystal panel used in the mobile phone shown in FIG. 1 when viewed obliquely from below.

5 is a cross-sectional view of the liquid crystal panel shown in FIGS. 3 and 4. FIG.

6A and 6B are respectively a cross-sectional view showing a main part around a light guide plate used in the lighting device shown in FIG. 2 and an explanatory view of a mold used for molding this light guide plate. .

7A and 7B are a cross-sectional view of an electro-optical unit according to a second embodiment of the present invention used in the mobile phone shown in FIG. 1, and an illumination used in the electro-optical unit. It is a top view of an apparatus.

8A, 8B, and 8C are cross-sectional views each showing a main part around a light guide plate used in the lighting device shown in FIG. 7, and an explanation of a transmission preventing layer attached to the light guide plate. It is a figure and explanatory drawing of another permeation | transmission prevention layer.

FIGS. 9A, 9B, and 9C are explanatory views each showing a configuration example of a light source unit used in a lighting device of an electro-optical unit.

10A and 10B are respectively a cross-sectional view of a conventional electro-optical unit and a plan view of an illumination device used in this electro-optical unit.

11A and 11B are respectively a cross-sectional view showing a main part around a light guide plate used in the lighting device shown in FIG. 10 and an explanatory view of a reflector plate that is arranged opposite to a side end surface of the light guide plate. Is.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Mobile phone (electronic device) 2 Display part 3 Operation part 4 Speaker hole 5 Microphone hole 10 Illumination device 11 Light guide plate 17, 17 'Transmission prevention layer 60 Mold 61 Unevenness 66, 67, 68, 69 gold attached to the mold Inner side surface of mold 100 Electro-optical unit 111 Front side of light guide plate (light emission surface) 112 Back side of light guide plate 116 Side end surface of light guide plate (light incident end surface) 117, 118, 119 Side except light incident end surface of light guide plate Edge 400 LCD panel (electro-optical panel)

Claims (8)

[Claims] 1. A light guide plate having a front surface serving as a light emitting surface, a light source section for emitting light toward a light incident end surface of a side end surface of the light guide plate, and a rear surface side of the light guide plate. In a lighting device having a reflective layer, a lighting device characterized in that, of the side end faces of the light guide plate, a side surface excluding the light incident end face is formed with a transmission prevention layer integrated with the side end face. . 2. The permeation preventive layer according to claim 1,
An illuminating device, characterized in that the illuminating device is constituted by minute irregularities provided on a side end surface of the light guide plate. 3. The permeation preventive layer according to claim 1,
An illuminating device comprising a sheet attached to a side end surface of the light guide plate. 4. An electro-optical unit using the illuminating device according to claim 1, wherein light emitted from the light emitting surface is electrically connected to the light emitting surface of the light guide plate. An electro-optical unit, in which an electro-optical panel capable of displaying an image by optical modulation with an optical substance is arranged. 5. The electro-optical unit according to claim 4, wherein the electro-optical panel is a liquid crystal panel that modulates light with liquid crystal used as the electro-optical material. 6. An electronic device comprising a display unit including the electro-optical unit defined in claim 4 or 5. 7. A light guide plate made of plastic whose front surface side is a light emitting surface, a light source section which emits light toward a light incident end surface among side end surfaces of the light guide plate, and a back surface side of the light guide plate. In the method for manufacturing an illumination device having a reflection layer arranged, in manufacturing the light guide plate by resin molding in a mold, among the side end faces of the light guide plate, the side end faces other than the light incident end face are used. A method of manufacturing a lighting device, characterized in that fine irregularities are provided on an inner surface of the mold for constituting. 8. A light guide plate made of plastic, the front surface of which serves as a light emitting surface, a light source section which emits light toward a light incident end surface among side end surfaces of the light guide plate, and a rear surface side of the light guide plate. In a method for manufacturing an illuminating device having a reflection layer arranged, in manufacturing the light guide plate, after molding the light guide plate with a resin, side end faces of the light guide plate except for the light incident end face. A method for manufacturing a lighting device, characterized in that fine irregularities are provided on the surface.