JP2003215577A - Light guide device, optoelectronic device and electronic appliance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure by which a structure part having display screens on its front and rear surfaces can be thin-thickness in a light guide device and an optoelectronic device which can be applied to the structure part. <P>SOLUTION: A light guide plate 122 is shaped like a wedge whose thickness gradually decreases from the left end in the figure to the right end, and a light guide plate 142 is shaped like a wedge whose thickness gradually decreases from the right end in the figure to the left end. Since the wedges of the light guide plates 122 and 142 are arranged in a staggered manner, the thickness of the entire liquid crystal display device 100 can be reduced. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light guide device, an electro-optical device and electronic equipment.

[0002]

2. Description of the Related Art Generally, a liquid crystal display device having a liquid crystal display panel, a light guide plate arranged behind the liquid crystal display panel, and a light source arranged on a side of the light guide plate facing the end face of the light guide plate is known. Are known. In this liquid crystal display device,
The light emitted from the light source enters the light guide plate from the end face, is refracted in the light guide plate, is irradiated from the front surface of the light guide plate to the liquid crystal display panel, passes through the liquid crystal display panel, and finally The light is emitted to the front side of the panel (observation side).

FIG. 12 is a schematic sectional view schematically showing the structure of a liquid crystal display device 10 as an example of a conventional liquid crystal display device. The liquid crystal display device 10 includes a support 11 made of synthetic resin, a light guide plate 12 engaged and fixed to the support 11, a reflection sheet 13 arranged behind the light guide plate 12, The light guide plate 12 includes a frame-shaped light-shielding sheet 14 arranged on the front surface (upper surface in the drawing) and a liquid crystal display panel 20 arranged on the front surface side of the light-shielding sheet 14.

The liquid crystal display panel 20 is formed by bonding substrates 21 and 22 made of glass or the like with a sealing material 23 and enclosing a liquid crystal 24 inside the sealing material 23. Polarizing plates 25 and 26 are attached to the outer surfaces of the substrates 21 and 22.

A flexible wiring board 15 is connected to the liquid crystal display panel 20, and a light source 16 such as an LED (light emitting diode) is mounted on the flexible wiring board 15 and various electronic parts such as a semiconductor chip (not shown). Are mounted, and a drive circuit for driving the liquid crystal display panel 20 is configured.

In the field of use of the liquid crystal display device as described above, in recent years, in particular, portable electronic devices (for example, mobile phones).
In some cases, the first liquid crystal display screen may be arranged on the front surface side of the thin structure portion of the device and the second liquid crystal display screen may be arranged on the rear surface side of the thin structure portion. In such a case, the first liquid crystal display device and the second liquid crystal display device are separately attached to the inside of the front surface side and the inside of the back surface side of the thin structure portion. For example, a structure in which a circuit board is arranged inside a thin structure part, the first liquid crystal display device is mounted on the front surface of the circuit board, and the second liquid crystal display device is mounted on the back surface of the circuit board is adopted. ing.

[0007]

By the way, in recent years, there has been an increasing demand for miniaturization and thinning of portable electronic devices, and it is necessary to make the liquid crystal display device 10 thin. Not only the panel 20 but also the light guide plate 12 is becoming thinner. However, in the thin structure portion having the liquid crystal display screens on the front and back sides as described above, it is necessary to separately arrange the two liquid crystal display devices inside, so that the portion for accommodating the liquid crystal device must be thickened. In addition, there is a problem that it is difficult to make the device smaller and thinner than the current one.

Further, there is a manufacturing problem that the internal structure becomes complicated by assembling the two liquid crystal display devices separately in the thin structure portion and the assembling work becomes difficult.

Therefore, the present invention solves the above-mentioned problems, and an object thereof is to realize a light guide device capable of irradiating light on the front and back and capable of being sufficiently thinned. Another object of the present invention is to provide an electro-optical device which can be applied to an electronic device having a display screen on the front and back sides or a structural portion thereof and which can make the structural portion thinner.

[0010]

In order to solve the above-mentioned problems, a light guide device of the present invention comprises a first light guide plate and a first light guide plate arranged so as to planarly overlap with the first light guide plate. It is characterized by having two light guide plates and a light reflection layer having a light reflection function on both front and back surfaces, which is arranged between the first light guide plate and the second light guide plate.

According to the present invention, between the first light guide plate and the second light guide plate, which are arranged so as to overlap each other in a plane, there are light reflection layers having a light reflection function on both front and back surfaces. By this, since the light guided to either the first light guide plate or the second light guide plate can be reflected by the light reflection layer, it is possible to reduce the thickness as compared with the case where the two backlight devices are individually arranged. In addition, since the light reflecting layers can be commonly used for the light guide plates on both the front and back sides, it is not necessary to provide separate light reflecting layers, and the overall thickness of the device can be further reduced. Further, since only one light reflecting layer is required, the cost of parts can be reduced and the number of assembling steps can be reduced. Here, the light reflection layer means light reflection,
It includes all of those that perform various optical functions such as light scattering, light refraction, and the like that can eventually reflect light.

In the present invention, it is preferable that the first light guide plate, the light reflection layer, and the second light guide plate are directly laminated on each other. According to the present invention, the first light guide plate, the light reflection layer, and the second light guide plate are directly laminated without interposing other members or an adhesive layer (adhesive layer) (or,
By directly contacting each other without a gap),
Further, it becomes possible to make the device thinner.

In the present invention, it is preferable that the laminated body including the first light guide plate, the second light guide plate, and the light reflection layer is fixed to a common support. According to the present invention, an integrated electro-optical device (for example, a liquid crystal display device) having display surfaces on both front and back sides can be configured, and the first light guide plate and the second light guide plate both have a common support. Since it is supported and fixed by the above, it is possible to further reduce the overall thickness. In this case, when both the first light guide plate and the second light guide plate are fixed to the support body, only the first light guide plate is fixed to the support body, and light is reflected by the first light guide plate. When the layer and the second light guide plate are fixed, only the second light guide plate is fixed to the support, and the light reflection layer and the first light guide plate are fixed to the second light guide plate. Any of the cases are included.

In the present invention, the light reflection layer is preferably adhered to at least one of the first light guide plate and the second light guide plate. According to this invention, since the light reflection layer is adhered to one light guide plate, the light guide device becomes slightly thicker by the amount of the adhesive layer or the adhesive layer used for adhering the light reflection layer and the light guide plate. ,
It becomes possible to easily perform the assembly work and the positioning work after the adhesion. Here, at the time of assembling work, it is desirable to use a light-reflecting layer having an adhesive layer on either one of the front and back surfaces in advance.

In the present invention, it is preferable that the light reflection layer is adhered to both the first light guide plate and the second light guide plate. According to the present invention, the light guide device becomes thicker by the amount of the two adhesive layers or the adhesive layers used for bonding the light reflection layer and the first and second light guide plates, but the first light guide layer is provided via the light reflection layer. Since the light guide plate and the second light guide plate can be bonded to each other, the assembling work and the positioning work after the bonding can be performed more easily.

Next, in the liquid crystal display device of the present invention, the first light guide plate, the second light guide plate arranged so as to planarly overlap with the first light guide plate, and the first light guide plate. A light-reflecting layer provided between the light guide plate and the second light-guide plate and having a light-reflecting function on both front and back surfaces, and the light-reflecting layer of the first light-guide plate on the opposite side. A first electro-optical panel (for example, a first liquid crystal display body) and a second electro-optical panel (for example, a second liquid crystal display body) arranged on a side of the second light guide plate opposite to the light reflection layer. ), And are characterized by having.

According to the present invention, between the first light guide plate and the second light guide plate which are arranged so as to overlap each other in a plane, there are light reflection layers having a light reflection function on both front and back surfaces. By this, since the light guided to either the first light guide plate or the second light guide plate can be reflected by this light reflecting layer, it is possible to reflect either the first electro-optical panel or the second electro-optical panel. Will be able to illuminate. Therefore, it is possible to reduce the thickness as compared with the case where the two backlight devices are individually arranged, and since the light reflection layers can be commonly used for the light guide plates on the front and back sides, separate light reflection layers can be provided. Since it is not necessary to provide the device, the entire device can be made thinner. Further, since only one light reflecting layer is required, the cost of parts can be reduced and the number of assembling steps can be reduced. Here, the light-reflecting layer includes all those that perform various optical functions such as light-reflecting, light-scattering, and light-refracting so that light can be reflected as a result.

In the present invention, it is preferable that the first light guide plate, the light reflection layer, and the second light guide plate are directly laminated on each other. According to the present invention, the first light guide plate, the light reflection layer, and the second light guide plate are directly laminated without interposing other members or an adhesive layer (adhesive layer) (or,
By directly contacting each other without a gap),
Further, it becomes possible to make the device thinner.

In the present invention, it is preferable that the laminate having the first light guide plate, the second light guide plate, and the light reflection layer is fixed to a common support. According to the present invention, it is possible to configure an integrated electro-optical device having display surfaces on both front and back sides, and at the same time, to configure the first light guide plate and the second light guide plate.
Since the light guide plate and the light guide plate are both supported and fixed to a common support, the overall thickness can be further reduced. In this case, when both the first light guide plate and the second light guide plate are fixed to the support body, only the first light guide plate is fixed to the support body, and light is reflected by the first light guide plate. When the layer and the second light guide plate are fixed, only the second light guide plate is fixed to the support, and the light reflection layer and the first light guide plate are fixed to the second light guide plate. Any of the cases are included.

In the present invention, the light reflection layer is preferably adhered to at least one of the first light guide plate and the second light guide plate. According to this invention, since the light reflection layer is adhered to one light guide plate, the light guide device becomes slightly thicker by the amount of the adhesive layer or the adhesive layer used for adhering the light reflection layer and the light guide plate. ,
It becomes possible to easily perform the assembly work and the positioning work after the adhesion. Here, at the time of assembling work, it is desirable to use a light-reflecting layer having an adhesive layer on either one of the front and back surfaces in advance.

In the present invention, it is preferable that the light reflection layer is adhered to both the first light guide plate and the second light guide plate. According to the present invention, the light guide device becomes thicker by the amount of the two adhesive layers or the adhesive layers used for bonding the light reflection layer and the first and second light guide plates, but the first light guide layer is provided via the light reflection layer. Since the light guide plate and the second light guide plate can be bonded to each other, the assembling work and the positioning work after the bonding can be performed more easily.

In each of the above inventions, both the first electro-optical panel (first liquid crystal display) and the second electro-optical panel (second liquid crystal display) are attached to the support. May be fixed, or may be directly or indirectly fixed to the first light guide plate or the second light guide plate.

In the present invention, a first light source that emits light into the first light guide plate and a second light source that emits light into the second light guide plate are provided, and the first light source is provided. Light source and the second
It is preferable that the light sources of 1 are arranged at positions that do not overlap each other in plan view. According to the present invention, since the first light source and the second light source are arranged at positions where they do not overlap each other in a plane, it is possible to avoid a situation where the light source prevents the device from being made thin. become. Here, when at least one of the first light guide plate and the second light guide plate has a rectangular planar shape, the first light source and the second light source
It is desirable that the light source of No. 1 and the light source of No. 2 are adjacent to each other on the sides having different angles.

In order to solve the above problems, the liquid crystal display device of the present invention is such that the first electro-optical module and the second electro-optical module are arranged back to back. That is, if the display screen of the first electro-optical module is arranged on the front surface side, the display screen of the second electro-optical module is arranged on the rear surface side.

More specifically, the electro-optical device of the present invention has a first electro-optical module whose thickness is gradually reduced in a predetermined direction, and a thickness of which is opposite to the predetermined direction. A second electro-optical module configured to gradually decrease in a direction is arranged back to back.

According to the present invention, since the first electro-optical module and the second electro-optical module are arranged in a staggered manner when viewed in the direction of decreasing thickness thereof, the electro-optical device having display screens on both front and back sides. The device can be made thin.

Another liquid crystal display device of the present invention is the first liquid crystal display device.
Electro-optical panel, a first light guide plate disposed behind the first electro-optical panel, a second light guide plate disposed behind the first light guide plate, and the second conductive plate. And a second electro-optical panel disposed behind the light plate. Then, the first electro-optical panel and the second electro-optical panel can constitute a structural portion having display screens on both front and back sides.

More specifically, the electro-optical device according to the present invention is disposed on the first electro-optical panel and behind the first electro-optical panel so that the thickness thereof gradually decreases in a predetermined direction. A first light guide plate configured, and a second light guide plate disposed behind the first light guide plate and configured such that its thickness gradually decreases in a direction opposite to the predetermined direction, And a second electro-optical panel disposed behind the second light guide plate.

According to the present invention, the first light guide plate arranged behind the first electro-optical panel has a thickness that gradually decreases in a predetermined direction, and is arranged behind the first light guide plate. Second
Since the light guide plate has a thickness that gradually decreases in a direction opposite to the predetermined direction, the first light guide plate and the second light guide plate are alternately overlapped when viewed in the direction in which the thickness changes. The overall thickness of the device can be made thinner than before. Further, since both of the two light guide plates are configured so that the thickness thereof gradually decreases in a certain direction (for example, in a wedge shape), the surface of the light guide plate on the side opposite to the electro-optical panel can be efficiently used. Since it becomes possible to reflect the light and efficiently irradiate the electro-optical panel with the light, it is possible to obtain a bright display while suppressing the power consumption and the light source size.

In this case, it is sufficient that the first light guide plate and the second light guide plate are at least partially overlapped with each other in a plane, and are configured to have a shape that is in line with each other in a plane.
It is not necessary that the shapes are overlapped with each other.

In the present invention, the first light guide plate is configured to emit light to the first electro-optical panel, and the second light guide plate emits light to the second electro-optical panel. It is preferably configured to release. According to the present invention, it becomes possible to irradiate light to both the first electro-optical panel and the second electro-optical panel arranged on both sides by the first light guide plate and the second light guide plate. However, the light emitted from the second light guide plate may be configured to illuminate not only the second electro-optical panel but also the first electro-optical panel, or the first electro-optical panel. Not only the first electro-optical panel but also the second electro-optical panel may be illuminated by the light emitted from the light guide plate.

Here, between the first light guide plate and the second light guide plate, the light introduced into the first light guide plate is directed to the first electro-optical panel and the second light guide plate is guided. It is preferable to dispose a light scattering means, a light diffusing means, or a light reflecting means for directing the light introduced into the light plate to the second electro-optical panel. These light scattering means, light diffusing means, or light reflecting means are provided in a portion for directing the light introduced into the first light guide plate to the first electro-optical panel and in the second light guide plate. The part that directs the introduced light to the second electro-optical panel may be physically separate from each other, but both are common (single) optical action layers (sheets, layers, It is desirable that it is made of a plate-shaped material or the like, because it can be easily manufactured and can be further thinned. In this case, since the number of parts can be reduced, the cost of the product itself and the management cost of parts can be reduced.

In the present invention, the first light guide plate is disposed on one side of the first light guide plate and causes light to enter the first light guide plate.
Second light source and a second light guide plate disposed on the other side different from the one side and allowing light to enter the second light guide plate.
It is preferable to have a light source of According to this invention,
Since the first light source is arranged on one side of the first light guide plate and the second light source is arranged on the other side of the second light guide plate, the first light source and the second light source are flat. Since the light sources are arranged without overlapping, it is possible to prevent the thickness of the light source from limiting the thinning of the electro-optical device.

Here, it is desirable that the first light source is arranged on the side of the thickest portion of the first light guide plate in order to increase the light propagation efficiency, and the second light source is the second light guide plate. It is likewise desirable to be located laterally of the thickest part.

Further, it is desirable that the first light source and the second light source are arranged on the opposite sides to each other, but the present invention is not limited to this. For example, the first light guide plate and the second light guide plate. Is rectangular, when the first light source is arranged adjacent to one side of the first light guide plate and the second light guide plate,
The light source may be disposed adjacent to any of the remaining three sides.

In the present invention, it is preferable that the first light guide plate and the second light guide plate are in contact with each other directly or via an optical action layer. According to this invention,
Since the first light guide plate and the second light guide plate are in direct contact with each other or are in contact with each other via the optical action layer, the device can be further thinned. Here, the optical action layer refers to a layer having a function of performing some optical action with respect to light, such as a light scattering layer, a light diffusion layer, and a light reflection layer.

In the present invention, it is preferable to have a support frame for engagingly holding both the first light guide plate and the second light guide plate. According to the present invention, by engaging and holding the first light guide plate and the second light guide plate on the common support frame, it is possible to regulate the mutual positional relationship between the both light guide plates and at the same time The light plate can be accommodated compactly. Furthermore, by providing the inner surface of the common support frame with a reflecting function, the light emitted from the other end surface portion of the first and second light guide plates other than the end surface where the light source is arranged is returned to the light guide plate again. Therefore, the light utilization efficiency can be improved.

Next, the electronic equipment of the present invention is characterized by including the electro-optical device according to any one of the above, and control means for controlling the electro-optical device.

According to the present invention, it is possible to reduce the thickness of the structural portion having the display screens on both front and back sides. Further, since the front-side electro-optical module and the back-side electro-optical module can be easily integrated with each other, the assembling work can be facilitated and the internal structure of the above-mentioned structural portion can be simplified.

In the lighting device of the present invention, the first light guide plate, the second light guide plate disposed behind the first light guide plate, and the end face of the first light guide plate are disposed so as to face each other. And a second light source disposed opposite to the end surface of the second light guide plate. The first light guide plate has a light emitting surface on the side opposite to the second light guide plate, and
The light guide plate has a light emitting surface on the side opposite to the first light guide plate. Thereby, both the front and back sides of the first light guide plate and the second light guide plate can be illuminated. In particular,
It is preferable that an optical sheet (a light reflection layer, a light scattering layer, a light diffusion layer, or the like) is arranged between the first light guide plate and the second light guide plate. More specifically, the illuminating device of the present invention is provided with a first light guide plate whose thickness is gradually reduced in a predetermined direction, and a thickness of the first light guide plate disposed behind the first light guide plate. Includes a second light guide plate configured to gradually decrease in a direction opposite to the predetermined direction.

[0041]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of a light guide device, an electro-optical device, and an electronic apparatus including the same according to the present invention will be described in detail with reference to the accompanying drawings.

[First Embodiment] FIG. 1A is a schematic vertical sectional view showing a schematic configuration of a liquid crystal display device as an example of the electro-optical device of the present embodiment, and FIG. 1B is a planar arrangement of a light guide plate. It is a bottom view which shows.

The liquid crystal display device 100 includes a liquid crystal display panel (first liquid crystal display panel) 110 and a liquid crystal display panel 1.
A backlight 120 for illuminating 10 and a liquid crystal display panel (second liquid crystal display panel) 13 arranged back to back with the side opposite to the liquid crystal display panel 110 as the observation side.
0 and a backlight 140 for illuminating the liquid crystal display panel 130.

In the present embodiment, the liquid crystal display panel 11
0 and the backlight 120 constitute a first electro-optical module (first liquid crystal display module), and the liquid crystal display panel 130 and the backlight 140 constitute a second electro-optical module (second liquid crystal display module). .

Each of the liquid crystal display panels 110 and 130 is formed by bonding two substrates, each made of glass or the like, with a sealing material and enclosing the liquid crystal inside the sealing material. An electrode pattern is formed on the inner surfaces of the two substrates facing each other, and the liquid crystal changes its alignment state according to the voltage applied between the electrodes facing each other with the liquid crystal sandwiched therebetween. A wiring pattern (not shown) is drawn out from the electrode patterns of these liquid crystal display panels, and a semiconductor chip having a liquid crystal drive circuit or the like is directly mounted on the wiring pattern, or a wiring of a flexible wiring board or the like. A signal is input from the outside through the member.

The backlight 120 includes a light source (first light source) 121 composed of an LED (light emitting diode) or the like.
And a light guide plate (first light guide plate) 122 made of acrylic resin or the like, and a reflection sheet 123 attached on the back surface of the light guide plate 122. Further, the backlight 140 is provided with a light source (second light source) 141 composed of an LED (light emitting diode) or the like and a light guide plate (second light guide plate) 142 composed of an acrylic resin or the like. There is. Here, also in the backlight 140, the above-mentioned reflection sheet 123 is commonly used.

FIG. 2 is an exploded side view showing the light guide plates 122 and 142, the reflection sheet 123, and the sectional structure of the support frame body described later. As shown in FIG. 2, the light guide plate 122 is
It has a wedge shape in which the thickness gradually decreases from the left end in the drawing to the right end, and the thickest left end in the drawing is an end face 12 which is a light incident surface.
2a is provided, a back surface 122b is provided on the side of the reflection sheet 123, and a front surface 122c is provided on the side opposite to the reflection sheet 123.
Is provided. The back surface 122b and the front surface 122c are mutually inclined at a predetermined angle. On the side surface (both the side surface shown in the figure and the side surface on the opposite side not shown) of the light guide plate 122, on the thick side thereof, an engaging groove 122d formed to open to the front surface 122c and a rear surface 122b are formed. And an engaging groove 122e formed on the front surface 122c, and a V-shaped engaging groove 122f formed so as to open on the front surface 122c.

The light guide plate 142 has a wedge shape in which the thickness gradually decreases from the right end in the drawing toward the left end, and the thickest right end in the drawing is provided with an end face 142a serving as a light incident surface.
A back surface 142b is provided on the reflection sheet 123 side, and a front surface 142c is provided on the opposite side to the reflection sheet 123 side. The back surface 142b and the front surface 142c are inclined to each other at a predetermined angle. On the side surface (both the side surface shown and the side surface on the opposite side not shown) of the light guide plate 142, on the thick side thereof, the engagement groove 1 formed so as to open to the front surface 142c.
42d and the engaging groove 1 formed so as to open to the rear surface 142b
42e, and the front surface 142
A V-shaped engagement groove 142f formed so as to open at c is provided.

The back surface 122 of the light guide plates 122 and 142.
It is preferable that fine concave-convex patterns (rough surface patterns) for scattering and diffusing the light introduced therein are formed on b and 142b.

As the reflection sheet 123, a sheet including a reflection layer such as an aluminum foil, a synthetic resin sheet such as white polyethylene terephthalate, a multilayer resin sheet in which transparent layers (films) having different refractive indexes are alternately laminated is used. You can

In the above embodiment, one or a plurality of light sources 121 are arranged so as to face the end surface 122a of the light guide plate 122.
Are adjacently arranged, and one or a plurality of light sources 141 are adjacently arranged so as to face the end surface 142a of the light guide plate 142. The light sources 121 and 141 may be attached to a support frame body described later, or the liquid crystal display panels 110 and 130.
It may be mounted on a flexible wiring board (not shown) mounted on the.

In this embodiment, the light emitted from the light source 121 enters the inside of the light guide plate 122 from the end face 122a,
The front surface 122c is formed by reflection on the back surface 122b inside the light guide plate 122 and the reflection sheet 123 covering the back surface 122b.
The liquid crystal display panel 110 is substantially uniformly emitted from the light source to illuminate the liquid crystal display panel 110. Similarly, the light emitted from the light source 141 enters the inside of the light guide plate 142 from the end surface 142a,
The rear surface 142b inside the light guide plate 142 and the front surface 142c due to reflection by the reflection sheet 123 covering the rear surface 142c.
The liquid crystal display panel 130 is substantially uniformly emitted from the light source to illuminate the liquid crystal display panel 130.

The support frame 150 is used for the liquid crystal display panel 11
0, 130 and the light guide plates 122, 142 are positioned with respect to each other, and can be made of integrally molded synthetic resin or the like. The support frame 150 is provided with engagement protrusions 151 to 156 on a pair of inner side surfaces facing each other.
The light guide plates 122 and 142 are configured to be engaged and held.

3 (a) and 3 (b) are schematic cross-sectional views showing a state in which the light guide plates 122, 142 and the reflection sheet 123 are incorporated in the support frame 150 of this embodiment (the support frame shown in FIG. 2). FIG. 4 is a view showing a cross section taken along a plane orthogonal to the cross section of FIG. By press-fitting the light guide plate 122 from above in the drawing, the engagement projections 151, 152 of the support frame 150 are engaged with the engagement grooves 122d, 122e of the light guide plate 122, and the engagement grooves 122f of the light guide plate 122 are engaged. The engagement protrusion 153 of the support frame 150 is configured to engage. As a result, the light guide plate 122 is held by the support frame body 150.
Similarly, by pressing the light guide plate 142 into the support frame 150 from below in the drawing, the engaging protrusions 15 of the support frame 150 are inserted into the engaging grooves 142d and 142e of the light guide plate 142.
4, 155 engage with each other, and the engaging groove 14 of the light guide plate 142.
The engagement protrusion 156 of the support frame 150 is configured to engage with 2f. As a result, the light guide plate 142 is held by the support frame body 150. Here, the light guide plates 122 and 142
The order of incorporating the reflection sheet 123 and the reflection sheet 123 into the support frame 150 is not limited to the above-described order, and may be changed arbitrarily. For example, the light guide plate 142, the reflection sheet 123, and the light guide plate 122 may be sequentially attached to the support frame 150. It is also possible to incorporate it.

The inner surface of the support frame 150 is provided with a reflection function (for example, a reflective layer is formed on the inner surface,
By making the refractive index of the material of the support frame smaller than the refractive index of the light guide plate), light leaking from the light guide plate (especially the end surface other than the light incident surface) is reflected and made to enter the light guide plate again. Therefore, the light utilization efficiency can be improved.

In the present embodiment, as described above, the two liquid crystal display modules are arranged back to back, and the respective liquid crystal display modules are formed in a wedge shape as a whole so that the wedge shapes are staggered from each other. Since it is arranged in the above, it is possible to reduce the thickness of the entire device including the two liquid crystal display modules.

In particular, in this embodiment, since the light guide plates 122 and 142 in the liquid crystal display module are formed in a wedge shape, respectively, the light guide efficiency of the light guide plates can be enhanced, and the liquid crystal display panels 110 and 130, respectively. The display of can be brightened.

Further, since the light source 121 and the light source 141 in the two liquid crystal display modules are arranged on different sides when viewed from the light guide plates 122 and 142, the light source 121 and the light source 141 overlap each other in a plane. Therefore, it is possible to prevent a situation in which the thickness of the light source prevents the liquid crystal display device from becoming thinner.

Further, in this embodiment, a single reflection sheet 123 is arranged between the light guide plates 122 and 142, and this reflection sheet 123 functions as a light reflection means for both the backlights 120 and 140. Since it is not necessary to provide a light reflection means for each light guide plate, it is possible to further thin the device,
The number of man-hours for assembling the device can be reduced.

[Modification] FIGS. 4A and 4B schematically show the structure of a modification of the above embodiment. The liquid crystal display device 200 shown in FIG. 4A includes a liquid crystal display panel 210, a light source 221, a light guide plate 222, a reflection sheet 223, a liquid crystal display panel 230, a light source 241, and a light guide plate 242, which are almost the same as those in the above embodiment. I have it. But,
In this liquid crystal display device 200, the light guide plate 222 and the light guide plate 242 are arranged so as to be partially offset from each other in a plane position so as to have regions that are two-dimensionally protruding from each other. By doing so, although the planar size is increased, the thickness of the entire liquid crystal display device 200 can be further reduced as compared with the case of the above embodiment.

The liquid crystal display device 300 shown in FIG.
The liquid crystal display panel 310, the light source 321, the light guide plate 322, the reflection sheet 323, the liquid crystal display panel 330, the light source 341, and the light guide plate 342, which are almost the same as those in the above embodiment, are provided. However, in the liquid crystal display device 300, the light guide plate 342 is arranged so as to be completely included inside the plane area of the light guide plate 322. By doing so, the planar size of the entire liquid crystal display device 300 can be reduced.

[Second Embodiment] Next, a second embodiment, which has basically the same configuration as the first embodiment but has a more specific structure, will be described with reference to FIG.
FIG. 6 is a schematic vertical sectional view showing a schematic configuration of a light guide device and an electro-optical device according to the second embodiment of the invention. This liquid crystal display device 400 is arranged back to back with a liquid crystal display panel (first electro-optical panel) 410, a backlight 420 for illuminating the liquid crystal display panel 410, and a side opposite to the liquid crystal display panel 410 as an observation side. The liquid crystal display panel (second electro-optical panel) 430 and the backlight 440 for illuminating the liquid crystal display panel 430 are provided.

The liquid crystal display panels 410, 430 are composed of two substrates 411, 412, 4 made of glass or the like.
31 and 432 are pasted with sealing materials 413 and 433,
Liquid crystals 414 and 434 are sealed inside the sealing materials 413 and 433. Two boards 411, 412
Electrode patterns are formed on the inner surfaces of the 431432 facing each other, and the liquid crystal 414 and 434 are configured to change the alignment state according to the voltage applied between the electrodes facing each other with the liquid crystal 414 and 434 interposed therebetween. There is. A wiring pattern (not shown) is drawn out from the electrode patterns of the liquid crystal display panels 410 and 430, and the wiring pattern includes wiring members 404, such as a flexible wiring board.
A signal is input from outside via 406. A semiconductor chip having a liquid crystal drive circuit or the like may be directly mounted on the liquid crystal panels 410 and 430.

In the present embodiment, the liquid crystal display panel 41
0 and the backlight 420 constitute a first liquid crystal display module (first electro-optical module), and the liquid crystal display panel 430 and the backlight 440 constitute a second liquid crystal display module (second electro-optical module). .

Although the liquid crystal display module has been described as an example in each of the embodiments, in the case of a self-luminous device such as an organic electroluminescence device, a backlight (illumination device) is not required, so The first electro-optic module and the second electro-optic module may be composed of only the light emitting panels, and these may be stacked back to back. Here, it is preferable to dispose a light reflecting layer between the light emitting panels, and it is desirable that the light reflecting layers are common to the front and back light emitting panels.

The backlight 420 includes a light source (first light source) 121 composed of an LED (light emitting diode) or the like.
And a light guide plate (first light guide plate) 422 made of acrylic resin or the like. Also, backlight 4
40 is provided with a light source (second light source) 441 formed of an LED (light emitting diode) and the like, and a light guide plate (second light guide plate) 442 formed of an acrylic resin or the like.
Here, in both the backlight 420 and the backlight 440, the reflection sheet (light reflection layer) 402 disposed between the light guide plate 422 and the light guide plate 342 functions,
Light guide plates 422 and 442 emitted from the light sources 421 and 441
The light propagating inside is reflected to direct the light inside the light guide plate 422 to the liquid crystal display panel 410 and the light inside the light guide plate 442 to the liquid crystal display panel 430.

The support 401 is formed by integral molding using a material such as synthetic resin. This support 40
1 is configured to engage and hold the light guide plate 422 and the light guide plate 442. Here, a more detailed structure of the light guide device including the support 401, the reflection sheet 402, the light guide plate 422, and the light guide plate 442 is shown in FIG.

As shown in FIG. 5, the support 401 is formed in a frame shape as a whole, and includes a substantially rectangular outer frame portion 401a and an inner frame portion 401b extending inward from the outer frame portion 401a. There is. On the pair of opposing inner surfaces of the outer frame portion 401a,
Inverted triangular protrusion 401 having rectangular protrusions 401a1 and 401a2 and a pair of inclined engaging surfaces that are directed obliquely downward.
a3 and a projection 40 having a slanted engagement surface directed obliquely upward
1a4 are formed respectively. Also, the inner frame portion 40
Rectangular projections 401b are provided on the pair of opposing inner surfaces of 1b.
1, 401b2, a projection 401b3 having a pair of slanted engagement surfaces facing obliquely upward, and a projection 401b4 having a slanted engagement surface directed obliquely downward.

The light guide plate 422 is provided with a light source accommodation hole 422a penetrating vertically at one end. In addition, rectangular recesses 422b and 422 are formed at the pair of side ends of the light guide plate 422.
c, the first inclined surface 422d-1 facing diagonally upward and the second
Inverted triangular recess 422d with sloped surface 422d-2
And a notch-shaped recess 422e having an inclined surface directed obliquely downward. Where the recess 4
22b, 422c, 422d, 422e are the light guide plate 42.
The light guide plate 422 is opened to the side of the light guide plate 422 in the thickness direction, and is opened to the front or rear of the light guide plate 422 (upward or downward in the drawing).
In addition, the first inclined surface 422d-1 is the light source accommodation hole 42.
The second inclined surface 422d has an inclined surface facing the other end on the side opposite to the one end where 2a is formed.
-2 is an inclined surface facing the one end where the light source accommodation hole 422a is formed. Further, the recess 422d
Inside first inclined surface 422d-1 and second inclined surface 422d-
2 is an inclined surface facing the front surface side (upper surface side in the drawing) of the light guide plate 422, while the inclined surface inside the recess 422e is the light guide plate 4
It is an inclined surface facing the back surface side (lower side in the drawing) of 22.

Further, the light guide plate 442 is provided with a light incident surface 442a which is one end surface thereof, and rectangular concave portions 442b and 442c are provided at a pair of side ends thereof, and a first inclination which is directed obliquely downward. Surface 442d-1 and second inclined surface 442d
A triangular recess 442d having -2 and a notch recess 442e having an inclined surface directed obliquely upward are provided. Here, the recesses 442b and 442
The c, 442d, and 442e are opened to the side of the light guide plate 442, and are opened either before or after the light guide plate 442 in the thickness direction (upward or downward in the drawing). The first inclined surface 442d-1 is an inclined surface facing the other end opposite to the one end where the light incident surface 442a is formed, while the second inclined surface 442d is formed. -2 is an inclined surface facing the one end where the light incident surface 442a is formed. Further, the first inclined surface 44 in the recess 442d
2d-1 and the second inclined surface 442d-2 are inclined surfaces facing the front surface side (the upper surface side in the drawing) of the light guide plate 442, while
The inclined surface in the recess 442e is an inclined surface facing the back surface side (lower side in the drawing) of the light guide plate 442.

The reflection sheet 402 is constructed so as to be able to reflect light on both the front and back surfaces thereof. For example, a metal layer of aluminum or the like, or a laminate of a metal layer and a transparent layer may be used. As shown in FIG. 7A, the translucent layers 402Aa and 402Ab having different refractive indexes can be used.
It becomes possible to obtain a high reflectance by using a well-known multilayer reflective film 402A in which the layers are alternately laminated, and a white (scattering) film made of a polycarbonate resin or the like as shown in FIG. 7B. By using 402B, uniform white light can be obtained at low cost.

With the reflection sheet 402 placed on the inner frame portion 401b of the support 401, the light guide plate 422 is pushed in from above in the drawing to form the recesses 422b, 42.
2c, 422d, 422e the protrusions 401a1, 401a
2 by engaging the light guide plate 422 with the support 4
01 can be supported and fixed. In addition, the support 40
By pressing the light guide plate 442 from below in FIG. 1, the recesses 442b, 442c, 442d, 442e are depressed.
The protrusions 401b1, 401b2, 401b3, 401b
4 by engaging the light guide plate 442 with the support 4
01 can be supported and fixed. By doing so, the reflection sheet 402 is held in a state of being sandwiched by the light guide plates 422 and 442.

In the present embodiment, the light guide plate 422 is
The light guide plate 442 has a wedge shape in which the thickness gradually decreases from the left end to the right end of FIG. 5, the light source accommodation hole 422a is provided at the thickest left end portion in the drawing, and the light guide plate 442 extends from the right end to the left end in the drawing. The light guide plate 422 and the light guide plate 442 are staggered in the thickness change direction because the light entrance surface 442a is provided at the thickest right end in the drawing, which has a wedge shape in which the thickness gradually decreases. By overlapping each other in a plane in this posture, it is possible to further reduce the total thickness of the liquid crystal display device 400.

In the above embodiment, as shown in FIG. 6, the wiring member 404 connected to the liquid crystal display panel 410.
The light source 421 is mounted on the light guide plate 42.
The two light source accommodating holes 422a are arranged. Accordingly, the light emitted from the light source 421 enters the light guide plate 422, propagates in the light guide plate 422, and is reflected by the reflection sheet 4.
It is reflected by 02 and is irradiated toward the liquid crystal display panel 410. As a result, the image formed on the liquid crystal display panel 410 can be viewed from above in the drawing. A light source 441 is mounted on the wiring member 406 connected to the liquid crystal display panel 430, and the light source 441 is arranged to face the light incident surface 442a of the light guide plate 442. Thus, the light emitted from the light source 441 enters the light guide plate 442, propagates in the light guide plate 442, is reflected by the reflection sheet 402, and is emitted toward the liquid crystal display panel 430. As a result, the image formed on the liquid crystal display panel 430 can be viewed from below in the drawing.

It is to be noted that the inner surface of the support 401 is provided with a reflection function (for example, a reflective layer is formed on the inner surface, or the material of the support is made to have a refractive index smaller than that of the light guide plate). Thus, the light leaking from the light guide plate (particularly the end surface other than the light incident surface) can be reflected and made to enter the light guide plate again, so that the light utilization efficiency can be improved.

In the present embodiment, the above-mentioned light guide plate 422,
The light guide plate 42 is fixed by the fixing structure of the support member 401 and the support member 401.
2,442 can be formed thin,
As described above, the two liquid crystal display modules are arranged back to back with each other, and the respective liquid crystal display modules are formed in a wedge shape as a whole, and the wedge shapes are arranged alternately with each other. It is possible to reduce the thickness of the entire device including one liquid crystal display module.

In particular, in this embodiment, since the light guide plates 422 and 442 in the liquid crystal display module are each formed in a wedge shape, the light guide efficiency of the light guide plate can be improved and the respective liquid crystal display panels 410 and 430 can be improved. The display of can be brightened.

Further, since the light source 421 and the light source 441 in the two liquid crystal display modules are arranged on the mutually different sides when viewed from the light guide plates 422 and 442, the light source 421 and the light source 441 are planarly overlapped. Therefore, it is possible to prevent a situation in which the thickness of the light source prevents the liquid crystal display device from becoming thinner.

Further, in this embodiment, a single reflection sheet 402 is arranged between the light guide plates 422 and 442, and this reflection sheet 402 functions as a light reflection means for both the backlights 420 and 440. Since it is not necessary to provide a light reflection means for each light guide plate, it is possible to further thin the device,
The cost of parts can be reduced and the number of man-hours for assembling the device can be reduced.

[Third Embodiment] Next, a light guide device and a liquid crystal display device according to a third embodiment of the present invention will be described with reference to FIGS. In the liquid crystal display device 500 of this embodiment, a support 501, a reflection sheet 502, and a liquid crystal display panel 510 that are almost the same as those in the second embodiment described above.
(Substrate 511, 512, sealing material 513, liquid crystal 514,
Polarizing plates 515, 516), backlight 520 (light source 5)
21, light guide plate 522), liquid crystal display panel 530 (substrate 5)
31, 532, sealing material 533, liquid crystal 534, polarizing plate 5
35, 536) and a backlight 540 (light source 541, light guide plate 542), the description of the same parts will be omitted.

The first difference of the present embodiment from the second embodiment is that, as shown in FIG. 8, the light guide plates 522 and 542 are formed in parallel flat plate shapes (flat plate shapes). The point is that it is not formed in a wedge shape. In this embodiment, unlike the second embodiment, the two wedge-shaped light guide plates do not overlap with each other in an alternating manner, and thus the effect of reducing the thickness cannot be obtained, but the light guide plates 522 and 542 have a single reflection sheet 502. Since they are stacked with each other and are supported by the common support 501, it is possible to make the device thinner than the conventional structure in which two liquid crystal display devices are separately installed.

The second difference of the present embodiment from the second embodiment is that, as shown in FIG. 9, adhesive layers 502As and 502Bs are provided on at least one surface of the reflection sheets 502A and 502B similar to the second embodiment. The reflective sheets 502A and 502B are formed and the adhesive layers 502As and 502 are formed.
The point is that it is adhered to the light guide plate 522 by Bs. In this case, the device becomes slightly thicker by the amount of the adhesive layers 502As and 502Bs. However, for example, before the light guide plate 522 is engaged with the support body 501, the reflection sheet 502 is attached to the light guide plate 522 in advance. By setting it, the assembling work and the positioning work of the liquid crystal display device 500 can be performed extremely easily. Specifically, since the reflection sheet 502 is attached to the light guide plate 522 in advance, when the light guide plate 522 is engaged with the support body 501, the reflection sheet 502 is not displaced, and the reflection sheet 502 is not reflected. Seat 50
It is not necessary to separately fix 2 to the support 501.

Further, as shown by the dotted line in FIG. 9, the adhesive layers 502 are formed on the front and back surfaces of the reflection sheets 502A and 502B, respectively.
By forming As and 502Bs in advance, the reflection sheet 502 can be attached to the other light guide plate 542. Therefore, even if both of the light guide plates 522 and 542 are not engaged and fixed to the support body 501 as in the second embodiment, only one of the light guide plates 522 and 542 is engaged and fixed to the support body 501. Thus, the other light guide plate can be indirectly supported and fixed. Therefore, the assembling work can be performed more easily.

[Fourth Embodiment] Next, FIG. 10 and FIG.
An embodiment of an electronic apparatus including the liquid crystal display device 100 will be described with reference to FIG. As shown in FIG. 10, the electronic device of this embodiment has the liquid crystal display panel 110 described above.
And a liquid crystal display panel 1
Control means 1300 for controlling 30. The control means 1100 and 1300 are controlled by a central control unit 1000 configured by a microcomputer installed in an electronic device.

The liquid crystal display panels 110 and 130 are mounted on the panel or are connected to the panel via wiring members. The drive circuit 1 is composed of a semiconductor IC or the like.
10D and 130D are connected to these drive circuits 110
D and 130D are connected to the control means 1100 and 1300. The control means 1100, 1300 includes display information output sources 1110, 1310, a display processing circuit 1120,
1320, power supply circuits 1130 and 1330, and timing generators 1140 and 1340.

The display information output sources 1110 and 1310 are R
OM (Read Only Memory) and RAM (Random Access Me)
mory) and the like, a storage unit such as a magnetic recording disk and an optical recording disk, and a tuning circuit that tunes and outputs a digital image signal, based on various clock signals generated by the timing generators 1140 and 1340. Then, display information is displayed in the form of an image signal or the like in a predetermined format.
It is configured to supply 20.

The display information processing circuits 1120 and 1320 are
It is equipped with various well-known circuits such as a serial-parallel conversion circuit, an amplification / inversion circuit, a rotation circuit, a gamma correction circuit, and a clamp circuit, executes the processing of the input display information, and drives the image information together with the clock signal CLK. Supply to. The drive circuits 110D and 130D include a scan line drive circuit, a data line drive circuit, and an inspection circuit. Also,
The power supply circuits 1130 and 1330 supply a predetermined voltage to each of the above components.

The central control unit 1000 has the control means 11
00, 1300, display information output sources 1110, 1310 are appropriately transmitted with a turn-on / turn-off command, original data of display information, and the like, and display information corresponding thereto is displayed information output source 111.
0, 1310 to output the control means 1100, 1300
Also, an appropriate display image is displayed on the liquid crystal display panels 110 and 130 via the drive circuits 110D and 130D. The central control unit 1000 is also configured to control the light sources 121 and 141 such as turning on and off.

FIG. 11 shows a mobile phone 2000 which is an embodiment of an electronic device according to the present invention. The mobile phone 2000 has a main body section 2001 provided with various operation buttons and a built-in microphone, and a display section 2002 having a display screen and an antenna and a built-in speaker.
And the display unit 2002 are configured to be mutually foldable. The liquid crystal display device 10 is provided in the display unit 2002.
0 is built in, and the liquid crystal display panel 11 is provided on the inner surface thereof.
The display screen of 0 is visible, and the display screen of the liquid crystal display panel 130 is visible on the outer surface.

In this embodiment, by opening the display unit 2002 from the main body unit 2001 as shown in FIG. 11A, the liquid crystal display panel 110 is turned on by a command from the central control unit 1000, and a predetermined image is displayed. The liquid crystal display panel 1 is displayed by folding the display unit 2002 on the main body unit 2001 as shown in FIG.
The liquid crystal display panel 130 may be turned on and a predetermined image may be displayed instead of turning off the light.

In the present embodiment, since the liquid crystal display device 100 is made thin as described above, the display unit 2002 can be made thin and the internal structure thereof can be made simple, and the assembling can be performed. Work can be easily performed.

The electro-optical device and the electronic apparatus according to the present invention are not limited to the above-described illustrated examples, and it goes without saying that various modifications can be made without departing from the scope of the present invention. For example, although a liquid crystal display panel is used as the electro-optical panel in each of the above embodiments, various electro-optical panels such as an organic electroluminescence panel and a plasma display panel can be used as the electro-optical panel of the present invention. It is also possible to use an electroluminescence panel as the above-mentioned light guide.

[0093]

As described above, according to the present invention,
It is possible to reduce the thickness of a light guide device capable of guiding light to both front and back surfaces, an electro-optical device having display screens on both front and back surfaces, and an electronic device including the same.

[Brief description of drawings]

FIG. 1 is a schematic sectional view (a) schematically showing a schematic configuration of a first embodiment of an electro-optical device according to the invention and a bottom view (b) showing a planar arrangement of a light guide plate and a light source.

FIG. 2 is an exploded view of a light guide plate, a reflection sheet, and a support frame body according to the first embodiment.

FIG. 3 is sectional views (a) and (b) showing a state in which the light guide plate of the first embodiment is attached to a support frame.

FIG. 4 is schematic cross-sectional views (a) and (b) showing a modified example of the first embodiment.

FIG. 5 is an exploded perspective view showing a structure of a light guide device portion in a second embodiment of the light guide device and the electro-optical device according to the invention.

FIG. 6 is a schematic vertical cross-sectional view schematically showing the overall configuration of the second embodiment.

7A and 7B are cross-sectional views (a) and (b) showing a structural example of a reflection sheet according to a second embodiment.

FIG. 8 is a schematic sectional view showing an overall configuration of a third embodiment of a light guide device and a liquid crystal display device according to the present invention.

9A and 9B are cross-sectional views (a) and (b) showing a structural example of a reflecting sheet of a third embodiment.

FIG. 10 is a schematic block diagram showing a configuration of a control system in the embodiment of the electronic device according to the present invention.

FIG. 11 is a schematic perspective view (a) and (b) of an embodiment of an electronic device according to the present invention.

FIG. 12 is a schematic cross-sectional view schematically showing an overall configuration of a conventional liquid crystal display device.

[Explanation of symbols]

100 ... Liquid crystal display device 110 ... Liquid crystal display panel (first electro-optical panel) 120 ... Backlight 121 ... Light source (first light source) 122 ... Light guide plate (first light guide plate) 122d-122f ... Engagement groove 123 ... Reflective sheet 130 ... Liquid crystal display panel (second electro-optical panel) 140 ... Backlight 141 ... Light source (second light source) 142 ... Light guide plate (second light guide plate) 142d-142f ... Engaging groove 150 ... Support frame 151-156 ... Engaging projection 400 ... Liquid crystal display device 401 ... Support 401a ... Outer frame part 401a1 to 401a4 ... Protrusions 401b ... Inner frame 401b1-401b4 ... Protrusion 402, 402A, 402B ... Reflective sheet 410 ... Liquid crystal display panel (first electro-optical panel) 420 ... Backlight 421 ... Light source (first light source) 422 ... Light guide plate (first light guide plate) 422a ... Light source accommodation hole 422b to 422e ... Recesses 422d1 ... First inclined surface 422d2 ... second inclined surface 430 ... Liquid crystal display panel (second electro-optical panel) 440 ... Backlight 441 ... Light source (second light source) 442 ... Light guide plate (second light guide plate) 442a ... Light incident surface 442b to 442e ... Recesses 442d1 ... First inclined surface 442d2 ... second inclined surface

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) // F21Y 101: 02 F21Y 101: 02

Claims (18)

[Claims] 1. A first light guide plate, a second light guide plate arranged so as to planarly overlap with the first light guide plate, the first light guide plate and the second light guide plate. And a light-reflecting layer having a light-reflecting function on both front and back surfaces,
A light guide device comprising: 2. The light guide device according to claim 1, wherein the first light guide plate, the light reflection layer, and the second light guide plate are directly laminated on each other. 3. The first light guide plate, the second light guide plate,
The light guide device according to claim 1 or 2, wherein the laminate including the light reflection layer is fixed to a common support. 4. The light reflection layer is adhered to at least one of the first light guide plate and the second light guide plate. The light guide device according to item. 5. The light-reflecting layer is adhered to both the first light guide plate and the second light guide plate, as claimed in any one of claims 1 to 3. Light guide device. 6. A first light guide plate, a second light guide plate arranged so as to planarly overlap with the first light guide plate, the first light guide plate and the second light guide plate. A light reflection layer having a light reflection function on both front and back surfaces, and a first electro-optical panel arranged on the opposite side of the first light guide plate from the light reflection layer, And a second electro-optical panel disposed on the side of the second light guide plate opposite to the light reflection layer. 7. The electro-optical device according to claim 6, wherein the first light guide plate, the light reflection layer, and the second light guide plate are directly laminated on each other. 8. The first light guide plate, the second light guide plate,
The electro-optical device according to claim 6 or 7, wherein the laminate having the light reflection layer is fixed to a common support. 9. The light reflecting layer is adhered to at least one of the first light guide plate and the second light guide plate. The electro-optical device according to the item. 10. The light-reflecting layer is adhered to both the first light guide plate and the second light guide plate, as claimed in any one of claims 6 to 8. Electro-optical device. 11. A first light source, which emits light into the first light guide plate, and a second light source, which emits light into the second light guide plate, wherein the first light source comprises: The electro-optical device according to any one of claims 6 to 10, wherein the second light source is arranged at a position where the second light source does not overlap each other in plan view. 12. A first electro-optical module having a thickness gradually decreasing in a predetermined direction, and a second electro-optical module having a thickness gradually decreasing in a direction opposite to the predetermined direction. The electro-optical device, wherein the electro-optical module and the electro-optical module are arranged back to back. 13. A first electro-optical panel, a first light guide plate disposed behind the first electro-optical panel, the thickness of which is gradually reduced in a predetermined direction, and the first light guide plate. A second light guide plate disposed behind the first light guide plate and having a thickness that gradually decreases in a direction opposite to the predetermined direction; and a second light guide plate disposed behind the second light guide plate. 2. An electro-optical device comprising: 2. 14. The first light guide plate is configured to emit light to the first electro-optical panel, and the second light guide plate emits light to the second electro-optical panel. 14. The electro-optical device according to claim 13, wherein the electro-optical device is configured as described above. 15. The first light guide plate is disposed on one side of the first light guide plate,
A first light source that allows light to enter the first light guide plate, and the second light guide plate is disposed on the other side different from the one side;
The electro-optical device according to claim 13 or 14, further comprising: a second light source that allows light to enter the second light guide plate. 16. The method according to claim 13, wherein the first light guide plate and the second light guide plate are in contact with each other directly or through an optical action layer. The electro-optical device according to Item 1. 17. The support frame body according to claim 13, further comprising a support frame body that engages and holds both the first light guide plate and the second light guide plate. Electro-optical device. 18. The method according to any one of claims 6 to 17.
An electronic device comprising: the electro-optical device according to the item 1 and a control unit that controls the liquid crystal display device.