JP4238926B2 - Electro-optical device and electronic apparatus - Google Patents

Description

The present invention relates to an electro-optical device and an electronic apparatus. In particular, the present invention relates to a double-sided display type electro-optical device that is less affected by interference fringes and an electronic apparatus including such an electro-optical device.

Conventionally, as one aspect of an electro-optical device, a plurality of pixel regions composed of opposing regions of electrodes are formed, and a voltage applied to each pixel region is selectively turned on and off, whereby a liquid crystal material for the pixel region Liquid crystal display devices that modulate light passing through and display images such as pictures and characters over the entire display area are widely used.
Although a double-sided display type liquid crystal display device has been proposed for multifunctional use, a common single-sided display type is used to illuminate a liquid crystal panel constituting both sides with one light source and a light guide plate. There was a problem that it was difficult to obtain sufficient brightness as compared with a liquid crystal display device.

Therefore, as shown in FIG. 14, a single light guide plate 302 having a light source 301 disposed at the end thereof.
The liquid crystal display panels 307 and 308 are arranged on both sides of the liquid crystal display panel 307 and 308, respectively.
There has been proposed a double-sided display type liquid crystal display device in which reflective polarizing plates 305 and 306 are arranged between 08 and the light guide plate 302 and the transmission axes of the reflective polarizing plates 305 and 306 are adjusted.
More specifically, the transmission axes of the reflective polarizing plates 305 and 306 are made to coincide with the transmission axes of the liquid crystal panel polarizing plates 309 and 310 facing the reflective polarizing plate on the same side with respect to the light guide plate 302 and the reflective polarizing plates. The transmission axes of 305 and the liquid crystal panel polarizing plate 309 are configured to be orthogonal to the transmission axes of the reflective polarizing plate 306 and the liquid crystal panel polarizing plate 310 on the opposite side across the light guide plate 302 (see, for example, Patent Document 1). ).

JP 2004-46050 A (Claims, FIG. 1)

However, even the double-sided display type liquid crystal display device proposed in Patent Document 1 is still
There has been a problem that the efficient use of light in the light source is insufficient and it is difficult to uniformly guide light.
In addition, in such a double-sided display type liquid crystal display device, it has been proposed to use a light guide plate having an inclined portion (sometimes referred to as a wedge portion) that gradually increases in thickness toward the light source. However, there is a problem in that light easily leaks in the inclined portion, which causes interference fringes.
Accordingly, the inventors of the present invention have made intensive efforts to provide an inclined portion of a predetermined shape at the end of the light guide plate, and to consider the inclined portion of the light guide plate and the arrangement relationship of the plurality of display panels. The present invention has been completed by finding that the influence can be reduced even when interference fringes are generated.
That is, the present invention provides a double-sided display type electro-optical device that is less affected by interference fringes even when display panels are provided on both sides, and an electronic device including such an electro-optical device. One of the purposes.

Application Example 1 According to this application example, the electro-optical device includes a light source, a light guide plate, a first display panel, and a second display panel, and the light guide plate faces the light source. In addition, the second display panel is disposed on the surface side (sometimes referred to as an inclined surface) of the light guide plate provided with an inclined portion that gradually increases in thickness at the end portion. The first display panel is disposed on the side of the light guide plate that does not include the inclined portion (sometimes referred to as a non-inclined portion surface), and
An electro-optical device is provided in which the end position of the display area of the second display panel is arranged closer to the light source than the end position of the display area of the first display panel. Can be solved.
That is, an inclined portion having a predetermined shape is provided at the end of the light guide plate, and correspondingly,
By considering the relationship between the positions of the end portions of the plurality of display panels, even if light leakage occurs in the inclined portion, the second display panel is adjusted so that interference fringes are generated in the vicinity of the light source, In the first display panel, the interference fringes can be adjusted so as to be generated at a position relatively far from the light source.
Therefore, the first display panel and the second display panel can be arranged so as not to be affected by the interference fringes generated, and the image display area in the first display panel and the second display panel can be set. The influence of the interference fringes in each can be reduced as much as possible.

Application Example 2 In configuring the electro-optical device according to the application example, it is preferable that the area of the display area of the second display panel is larger than the area of the display area of the first display panel.
In this way, by considering the area relationship between the first display panel and the second display panel, the influence of interference fringes on the second display panel or the like can be further reduced.

Application Example 3 In configuring the electro-optical device according to the application example, the frame further includes a frame that houses the light guide plate, and the frame covers the surface of the frame along the inclined portion of the light guide plate. It is preferable that a protrusion is provided.
By using a frame having a specific structure in this way, not only the fixing property of the first display panel is improved, but also the influence of interference fringes on the second display panel can be further reduced, and the light source Thus, it is possible to construct an electro-optical device with high light emission luminance.

Application Example 4 In configuring the electro-optical device according to the application example described above, a light reflection unit (including a light scattering unit is included) between the frame protrusion and the inclined portion of the light guide plate. is there.)
Is preferably provided.
By providing the light reflecting portion at the predetermined position, the light from the light source can be used more effectively, while the influence of interference fringes on the second display panel or the like can be further reduced.

Application Example 5 In configuring the electro-optical device according to the application example described above, it is preferable that the frame protrusion is formed of a light reflecting member (including a light scattering member; the same applies hereinafter). .
By using the frame protruding portion having such a configuration, the structure of the frame is simplified, and the light reflection characteristics at the frame protruding portion can also be improved.

Application Example 6 An electronic apparatus according to this application example includes the electro-optical device described above.
That is, an electronic apparatus including a double-sided display type electro-optical device that is less affected by interference fringes can be provided.

Hereinafter, exemplary embodiments of the electro-optical device and the electronic apparatus according to the invention will be specifically described with reference to the drawings as appropriate. However, this embodiment shows one aspect of the present invention.
The present invention is not limited, and can be arbitrarily changed within the scope of the present invention.

[First Embodiment]
As illustrated in FIGS. 1 and 2, the first embodiment includes a light source 31, a light guide plate 32, and a first
Electro-optical device (liquid crystal device) 1 including the display panel 10 and the second display panel 20.
The light guide plate 32 is provided with an inclined portion 32b whose thickness gradually increases toward the light source 31 at the end portion 32a, and a second display is provided on the surface side of the light guide plate 32 provided with the inclined portion 32b. While arrange | positioning the panel 20, the 1st display panel 10 is arrange | positioned on the surface side of the light-guide plate 32 which is not provided with the inclination part 32b, and the edge part position C of the display area 27 of the 2nd display panel 20 is set. The electro-optical device 1 is arranged at a position closer to the light source 31 than the end position D of the display area 17 of the first display panel 10.
Hereinafter, a liquid crystal device including a first display panel and a second display panel will be described as an example of the electro-optical device of the present embodiment.
That is, in the following description, a display panel means a part for an electro-optical device in which a liquid crystal material is injected between a pair of substrates bonded with a sealing material. The electro-optical device is a state in which a flexible circuit board, an electronic component, a light source, and the like are attached.
For convenience of explanation, in FIG. 1, the second display panel 20 is replaced with the first display panel 1.
In FIG. 2, the first display panel 10 is described above the second display panel 20. Moreover, in FIG. 1, although the inclination part 32b in the edge part 32a of the light-guide plate 32 is simplified and described, in FIG. 2 etc., the light-guide plate 32 which has the inclination part 32b is emphasized and described. .

1. Basic Configuration As shown in FIGS. 1 and 2, the liquid crystal device 1 is provided in a housing 2 and includes a pair of substrates 11, 1.
1 and the second display panel 2 composed of a pair of substrates 21 and 22.
0 and the lighting device 30.
The display area 27 of the second display panel 20 is larger than the display area 17 of the first display panel 10, and the first display panel 10 and the second display panel 20 are viewed vertically. In this case, the display areas 17 and 27 are arranged so that at least a part thereof overlaps. The lighting device 30 includes a light source 31 and a light guide plate 32, and is used as a backlight common to the first display panel 10 and the second display panel 20.

Further, as shown in FIG. 2, the first display panel 10 includes a pair of rectangular substrates 11 and 12 in a plan view, which are provided to face each other with a cell gap therebetween via a seal material 13, and these substrates. And a liquid crystal layer (electro-optical material) 14 sandwiched between 11 and 12. And
A lighting device 30 is disposed on the substrate 12 side of the first display panel 10.
In addition, an exit-side polarizing plate 15 is provided on the outer surface 11 a of the substrate 11, and an outer surface 12 a of the substrate 12 is provided on the outer surface 11 a.
An incident side polarizing plate 16 is provided. Further, a driver IC 4 for performing image display processing of each first display panel 10 and second display panel 20 is mounted on the substrate 12.

On the other hand, the second display panel 20 is similar to the first display panel 10 as shown in FIG.
A pair of rectangular substrates 21 and 22 in plan view provided opposite to each other with a cell gap interposed therebetween via a sealing material 23, and a liquid crystal layer (electro-optical material) sandwiched between the substrates 21 and 22
24. A lighting device 30 common to the first display panel 10 is arranged on the substrate 22 side of the second display panel 20.
An exit-side polarizing plate 25 is provided on the outer surface 21 a of the substrate 21, and an incident-side polarizing plate 26 is provided on the outer surface 22 a of the substrate 22.
The above-described substrates 11, 12, 21, and 22 are each configured as a light-transmitting substrate made of a transparent material such as glass or acrylic resin.

Further, as shown in FIGS. 3 and 4, a flexible circuit board (FPC board) 3 is provided at the end portions of the first display panel 10 and the second display panel 20, and has a conductive property such as an anisotropic conductive film. material(
(Not shown). The FPC board 3 is usually a flexible circuit board having flexibility, and an electronic component 5 or the like is further mounted on the circuit board.
Therefore, when the light source 31 is turned on in a state controlled by the driver IC 4 or the electronic component 5, the light (L) from the light source 31 is incident from the side of the light guide plate 32, and the front surface and the back surface of the light guide plate 32. A predetermined image display can be performed on the first display panel 10 and the second display panel 20 using the light emission.

In addition, FIG. 3 is a figure provided in order to demonstrate the surface side of the liquid crystal device 1 of 1st Embodiment.
In the case where the thickness of the liquid crystal device 1 is not limited, it is possible to arrange a light absorbing member 40 for absorbing or reflecting light leaking to the outside. In FIG. 3, the opening 40a of the light absorbing member 40 is indicated by a dotted line.
That is, as shown in FIG. 2, the light absorbing member 40 is between the first display panel 10 and the second display panel 20, and is on the back side of the light guide plate 32, that is, the first display panel 10.
On the side. Further, the light absorbing member 40 is provided outside the display area 17 of the first display panel 10. Therefore, as shown by a dotted line in FIG. 3, the light absorbing member 40 has an opening 40 a having a size equivalent to that of the display region 17 of the first display panel 10.
According to the light absorbing member 40, the light emitted from the upper surface side of the light guide plate 32, that is, the first display panel 10 side, and directed to the area other than the display area 17 of the first display panel 10 and the housing 2.
Light reflected from the inside, the frame protrusion 6a (see FIG. 5), and the like, and can be absorbed from the first display panel 10 side toward the second display panel 20.
Therefore, the light absorbing member 40 absorbs light emitted from a region where the first display panel 10 is not disposed in the second display panel 20, thereby performing the first display panel 10.
The first display panel 10 can transmit light from the opening 40a to the region where the first display panel 10 is disposed.
The end position D of the display area 17 of the first display panel 10 and the second display panel 2
The position where the interference fringes are generated is adjusted by bringing the end position C of the display area 27 of 0 close to the light source 31, respectively, and the display areas 17 and 27 of the first and second display panels 10 and 20 are adjusted.
In the case where the light absorbing member 40 is not disposed, the same effect as described above can be obtained.
On the other hand, FIG. 4 is a diagram for explaining the back side of the liquid crystal device 1 of the first embodiment, in which the substrate 11 of the first display panel 10 is directly visible and the electronic component 5 is mounted. It has been shown.

2. Illumination Device As shown in FIG. 2, the illumination device 30 includes a frame 6, a first display panel 10, and a second display device 10.
A light source circuit board 31a electrically connected to the display panel 20, a light source 31 mounted on the light source circuit board 31a, and light (L1) emitted from the light source 31 for the first time.
The light guide plate 32 for efficiently guiding the display panel 10 and the second display panel 20 to each other.
In FIG. 2, light leaked from the inclined portion 32b of the light guide plate 32 in the illumination device 30 (L2
') And the position where the interference fringes are generated by the light (L2) leaked from the opposed region reflected by the inclined portion 32b, and the generated position is represented by the region B in the first display panel 10. In the second display panel 20, the region A is indicated.

(1) Frame configuration 1
The frame 6 is not particularly limited as long as it can accommodate the light source circuit board 31a, the light guide plate 32, the light diffusion plate, and the like, and can protect them. For example, FIG. As shown, the overall structure is preferably a rectangular structure having an outer frame.
The reason is that by using such a frame 6, the first display panel 10 and the second display panel 10 can be used.
This is because the fixing property of the display panel 20 is improved. In addition, if the structure is rectangular, the overall size can be reduced.
In addition, according to this invention, as shown in FIG. 2, the light guide plate 32 which provided the inclined part 32b of the predetermined shape in the edge part 32a is used, and the 2nd surface side provided with the inclined part 32b of the light guide plate 32 is 2nd. Display panel 2
0, and the first display panel 10 is arranged on the side of the light guide plate 32 that does not include the inclined portion 32b, and the end position C of the display area 27 of the second display panel 20 is By approaching the light source 31 rather than the end portion position D of the display area 17 of the first display panel 10, it is possible to adjust the generation position of the interference fringes and eliminate the influence.
More specifically, in the light guide plate 32 in which the inclined portion 32b is formed, when light leakage occurs in the inclined portion 32b having an inclination angle set to efficiently propagate light (L), the second The display panel 20 side, that is, the side where the inclined portion 32b is formed is relatively close to the light source 31, and the first display panel 10 side, ie, the side where the inclined portion 32b is not formed is relatively closer to the light source 31. There is a characteristic that light (L2, L2 ′) is emitted and leaked at a distant position. According to the characteristics, the end position C of the display area 27 of the second display panel 20 is arranged closer to the light source 31 than the end position D of the display area 17 of the first display panel 10.
The interference fringes can be positioned outside the display areas 17 and 27 of both the first and second display panels 10 and 20, and the external dimensions of the liquid crystal device 1 can be reduced.
However, as shown in FIG. 5 and the like, the influence of the interference fringes can be further eliminated by providing the frame 6 with a predetermined frame protrusion 6a. The reason will be described later.

(2) Frame configuration 2
Further, when there is no space restriction like the light absorbing member 40, as shown in FIG. 5, the frame protrusion 6a for covering the surface of the frame 6 along the inclined portion 32b of the light guide plate 32 is provided. Is preferably provided.
This is because the light leaking from the inclined portion 32b of the light guide plate 32 can be efficiently blocked by providing such a frame protruding portion 6a.
Therefore, the influence of the generation of interference fringes in the second display panel 20 or the like can be reduced, and light leaked from the inclined portion 32b of the light guide plate 32 can be reflected back to the light guide plate 32 and returned. The light emitted from the light source 31 can be further effectively used to configure the liquid crystal device 1 with high emission luminance.
In addition, by using the frame 6 having the frame protruding portion 6a having the specific structure as described above, the fixability and the like of the second display panel 20 are further improved by the corner portion positioned below the frame protruding portion 6a. It is.

Here, with reference to FIG. 6, the effect of providing a frame protrusion at a predetermined position of the frame will be described in more detail.
FIG. 6 is a diagram for explaining a position where interference fringes are generated in the liquid crystal device according to the first embodiment. In FIG. 6, the line (L3) indicates the occurrence location of interference fringes in the first display panel 10, and the line (L4) indicates the occurrence location of interference fringes in the second display panel 20. Yes.
Accordingly, in FIG. 6, if the light leakage can be completely prevented by the frame protruding portion 6a, the interference fringes due to the line (L4) will not occur. In addition, even if light leakage cannot be completely prevented by the frame protruding portion 6a, the leaked light can be effectively reflected, etc., so that the influence of the occurrence of interference fringes on the second display panel 20 or the like is reduced. Can do.
That is, with the configuration shown in FIG. 6, the generation and location of interference fringes can be adjusted, so that the first display panel 10 and the second display panel 20 are not affected by the interference fringes generated. It becomes possible to comprise. Therefore, the first display panel 10
In addition, the influence of interference fringes in the display areas 17 and 27 in the second display panel 20 can be reduced as much as possible.

Further, the angle formed by the frame protrusion 6a shown in FIGS. 5 and 6 and the horizontal direction is set to the light guide plate 32.
According to the angle of the inclined portion 32b formed in the above, it is preferable to set the value within the range of 1 ° to 40 °.
The reason for this is that the light guide plate 32 can be obtained by considering the angle of the frame protrusion 6a.
This is because not only the engagement with the inclined portion 32b is facilitated but also the occurrence position of the interference fringes can be easily controlled, and the influence of the interference fringes on the second display panel 20 and the like can be further reduced.
Therefore, the angle formed by the frame protrusion 6a and the horizontal direction is more preferably a value within the range of 1 ° to 20 °, and even more preferably a value within the range of 2 ° to 15 °.

Further, as shown in FIG. 7, it is preferable to provide a light reflecting portion 33 between the frame protruding portion 6 a and the inclined portion 32 b of the light guide plate 32.
This is because the light guide plate 32 indicated by light (L2 ′) is provided by providing a light reflecting portion at a predetermined position.
This is because light leakage from the inclined portion 32b can be effectively prevented, and the influence of interference fringes on the second display panel 20 and the like can be further reduced. That is, the inclined portion 32 of the light guide plate 32.
Even if light leaks from b, it is reflected as shown by light (L2) in FIG. 7, and interference fringes can be generated at a predetermined position near the light source 31 (outside the display area 17).
On the other hand, as shown by light (L1) in FIG. 7, most of the light is inclined portion 32b of the light guide plate 32.
Then, the light is reflected at the interface with the light reflecting portion 33 and can be carried relatively far from the light source 31.
The light reflecting portion 33 is configured as a thin film metal reflecting portion made of aluminum, nickel, copper, silver, chromium, stainless steel or the like, or a thin film resin layer containing a light reflecting material such as silver particles or aluminum particles. It is preferable.

Although not shown, it is preferable that the above-described frame protruding portion 6a is composed of a light reflecting member.
This is because the structure of the frame 6 can be simplified by using the frame protruding portion 6a having such a configuration, while the light reflection characteristics of the frame protruding portion 6a can be improved.
That is, the frame protrusion 6a is made of aluminum, nickel, copper, silver, chrome,
It is preferably composed of a composite material containing therein a metal material such as stainless steel or a light reflecting material such as silver particles or aluminum particles. Therefore, since the entire frame 6 is made of such a metal material or composite resin, the manufacturing process of the frame protruding portion 6a and the entire frame 6 is stabilized or simplified. The characteristics can also be improved.

(3) Light Source Circuit Board Further, as the light source circuit board 31a accommodated in the frame 6, as shown in FIGS. 8A to 8B, a flexible circuit board on which the light source 31 is mounted is a typical example.
The light source circuit board 31a is a circuit board having a flexible flexible substrate such as polyimide resin as a base, the light source 31 is mounted in the vicinity of one end portion, and the panel connection terminal at the other end portion. (Not shown), and the light source 31 and the connection terminal are electrically connected via electric wiring. The light source circuit board 31a is bonded to the frame 6 through the mounting portion 31b. Moreover, it adhere | attaches similarly to the light-guide plate 32 via the mounting part 31b as needed.
Although not shown, the surface of the flexible circuit board as the light source circuit board 31a may be covered with an electrical insulating film except for the mounting area of the light source 31, the panel connection terminal portion, the inspection terminal portion, and the like. preferable.
The light source 31 mounted on the light source circuit board 31a is a light emitting diode (LED).
However, it is also possible to use a fluorescent tube, an incandescent light bulb, or the like.

Further, as shown in FIGS. 8A and 8B, the light source circuit board 31a has a mounting part 31b on which the light source 31 is mounted and an extension part 31d for taking out wiring from the mounting part 31b. , 31f.
That is, it is preferable that the mounting portion 31b in the light source circuit board 31a is substantially rectangular, and the extension portions 31d and 31f are formed in a strip shape so as to form an L shape from one end portion of the mounting portion 31b. The extension portions 31d and 31f are bent lines 31 provided in the middle.
It is preferable to be configured so that a mountain or valley can be folded by e.
This is because the light source circuit board 31a having such a configuration makes it easy and accurate to mount the light source circuit board 31a on the frame 6 and to align with the light guide plate 32 inside the frame 6. .

FIG. 9 shows another aspect of the light source circuit board 31a ′ on which the light source 31 is mounted. Such a light source circuit board 31a ′ is characterized by adopting a folding structure composed of a plurality of layers.
The reason for this is that the light source circuit board 31a ′ having a folded structure composed of a plurality of layers can maintain a predetermined strength even if the light source circuit board 31a ′ itself is thinned, and can be saved in the liquid crystal device 1. This is because it contributes to increasing the mounting area of the light source circuit board 31a ′ while contributing to space.
Furthermore, with such a light source circuit board 31 a ′ composed of a plurality of layers, not only the mountability and alignment with respect to the frame 6 are improved, but also the alignment with the light guide plate 32 becomes easy and accurate. Because.

The light source circuit board 31a ′ shown in FIG. 9 includes light source mounting portions 31b ′, 31c ′, and 31f ′.
However, a three-layer structure is substantially adopted, and not only a light source (not shown) but also various electronic components (
(Not shown) can be mounted.
Furthermore, in the case of the light source circuit board 31a ′ shown in FIG. 9, the lower light source mounting portion 31f ′ is provided with an extending portion 31g ′ protruding sideways, and a connector 31i is provided so that an external component terminal can be electrically connected thereto. 'Is provided, and the tip of the extended portion is further folded downwardly oppositely to form a folded portion 31h'.
Then, in the light source circuit board 31a ′ shown in FIG. 9, holes 31e provided in the vicinity of both ends.
'Is a positioning hole of the light source circuit board 31a'. That is, the hole 31e 'and FIG.
1 is engaged with the boss 101 of the bending member 100 shown in FIG. 1, and the light source circuit board 31a ′ is quickly and firmly fixed at a predetermined position.
In addition, although not shown, a reinforcing plate is prepared, a hole (hole) is formed in both the reinforcing plate and the light source circuit board 31a ′, and a light source circuit board 31a is formed using a jig that penetrates both. '
It is also preferable to use a configuration for aligning these.

(4) Light Guide Plate As a light guide plate for uniformly guiding light (L) to a display panel or the like, FIG.
), A light guide plate 32 having an inclined portion 32b is used.
Here, the light guide plate 32 is a plate material made of a light transmissive material such as an acrylic resin,
On the side where the first display panel 10 is disposed, as shown in FIG. 2 or FIG.
The first prism sheet 35 and the second prism sheet 36 are provided in this order.
The diffusion sheet 34 is a plate-shaped sheet member for diffusing the light emitted from the light guide plate 32. As such a diffusion sheet 34, an acrylic sheet or the like in which a diffusing agent is dispersed can be used. The diffusion sheet 34 can make the surface brightness of the light emitted from the light guide plate 32 uniform, and can effectively reflect the grooves and uneven shapes (brightness unevenness) of the first prism sheet 35 and the second prism sheet 36. Can be prevented.
Further, the first prism sheet 35 and the second prism sheet 36 are configured such that one surface side (first display panel 10 side) of a flat plate material made of transparent acrylic resin or the like is a prism surface. The prism surface is formed with periodic triangular wave-like irregularities (not shown) in the shape of side faces.

In the light guide plate 32 shown in FIG. 10A, an inclined portion 32 b is provided at the end portion 32 a of the light guide plate 32 such that the thickness gradually increases toward the light source 31.
That is, the light source 3 is formed by making the end portion 32a of the light guide plate 32 into a predetermined shape in this way.
The light (L) from 1 can be effectively used to provide an electro-optical device having a high emission luminance value and a uniform emission luminance.

Further, regarding the angle of the inclined portion 32b in the light guide plate 32, as shown in FIG.
It is preferable that the angle (θ1) formed by the inclined surface of the inclined portion 32b and the horizontal direction is a value within the range of 1 ° to 40 °.
The reason for this is that the light (L) from the light source 31 can be used more effectively and the uniformity of the emission luminance can be further improved by setting the angle of the inclined portion 32b to a value within a predetermined range. This is because it can.
Therefore, although it depends on the material and application of the light guide plate 32, it is more preferable that the angle (θ1) formed by the inclined surface of the inclined portion 32b and the horizontal direction is a value within the range of 1 ° to 20 °. ° ~ 2
More preferably, the value is within the range of 0 °.
As shown in FIG. 10B, the angle (θ between the inclined surface of the inclined portion 32b and the horizontal direction
By making 2) relatively larger than the angle (θ1) shown in FIG. 10A, the location where the interference fringes are generated can be brought closer to the light source 31, and the display areas 17, 27 can be brought closer.
The place where interference fringes are generated can be driven out. That is, the first display panel 10 and the second display panel 10
Even when the areas of the display panels 20 are relatively large, the influence of interference fringes can be reduced.

Further, regarding the length of the inclined portion 32b in the light guide plate 32, as shown in FIG.
It is preferable to set the horizontal length a to a value within the range of 0.1 mm to 5 mm.
The reason for this is that the light (L) from the light source 31 can be used more effectively by setting the predetermined length in the horizontal direction of the inclined portion 32b to a value within the predetermined range, and the uniformity of the emission luminance is also improved. This is because it can be further improved.
Therefore, although depending on the material and use of the light guide plate 32, the horizontal length a of the inclined portion 32b is more preferably set to a value within the range of 0.3 mm to 3 mm, and 0.5 mm to 2 m.
More preferably, the value is within the range of m.

Further, regarding the thickness of the inclined portion 32b of the light guide plate 32, as shown in FIG.
Is preferably set to a value within the range of 0.03 mm to 3 mm.
This is because the light (L) from the light source 31 can be used more effectively and the uniformity of the emission luminance can be further improved by adjusting the thickness c of the inclined portion 32b in this way. is there.
Accordingly, the thickness c of the inclined portion 32b is set to 0.05, although it depends on the material and use of the light guide plate 32.
It is more preferable to set the value within the range of mm to 1 mm, and it is even more preferable to set the value within the range of 0.07 mm to 0.8 mm.

3. Display panel layout relationship (1) Layout relationship 1
First, as shown in FIG. 2, the second display panel 20 is arranged on the surface side of the light guide plate 32 provided with the inclined portion 32 b, and the second side of the light guide plate 32 is provided on the surface side not provided with the inclined portion 32 b. One display panel 10 is arranged, and the end position C of the display area 27 of the second display panel 20 is set to the light source 31 more than the end position D of the display area 17 of the first display panel 10. It is characterized by approaching.
The reason for this is that an inclined portion 32b having a predetermined shape is provided at the end portion 32a of the light guide plate 32, and
By considering the relationship between the end positions C and D of the display regions 17 and 27 of the first and second display panels 10 and 20, light leakage occurred in the inclined portion 32b and the region facing the inclined portion 32b. 2, as indicated by light (L2, L2 ′) in FIG. 2, the interference fringes are generated at the end position C of the display area 17 of the first display panel 10 and the display area 27 of the second display panel 20. This is because it can be generated outside the end position D.
Accordingly, the first display panel 10 and the second display panel 20 can be arranged so as to avoid the interference fringe generation region, and the image display areas in the first display panel 10 and the second display panel 20 are provided. The influence of interference fringes in the display areas 17 and 27 can be reduced as much as possible. Further, as shown in FIG. 7, in the configuration in which the frame protrusion 6 a is formed on the frame 6, the influence of the interference fringes is substantially eliminated in the second display panel 20. The end position C of the display area 27 can be brought closer to the light source 31, and the image display section can be enlarged.
The end position D of the display area 17 of the first display panel 10 and the second display panel 20
In the case of the liquid crystal device 1 shown in FIG. 1, the position of the sealing materials 13 and 23 can be assumed as the end position C of the display area 27, but it can be substantially recognized as the end of the display area. As long as it is a place, it may be other than the sealing material, and as shown in FIG. 2, the end portion D of the display area 17 of the first display panel 10 is located farther than the area B where the interference fringes are generated. Display panel 2
The end portion of the zero display region 27 can be set to an end portion position C farther than the region A where interference fringes are generated.

(2) Arrangement relationship 2
In addition, as shown in FIG. 2, the distance (T1) between the end position D of the display area 17 of the first display panel 10 and the light source 31 is set to the end of the display area 27 of the second display panel 20. It is preferable that the distance (T2) between the part position C and the light source 31 is 1.01 to 10 times.
The reason for this is that by limiting the distances between the end positions C and D of the display areas 17 and 27 of the first display panel 10 and the second display panel 20 and the light source 31, respectively.
This is because the light (L) from the light source 31 can be used more effectively.
Therefore, the distance (T1) between the end position D of the display area 17 of the first display panel 10 and the light source 31 is set to the end position C of the display area 27 of the second display panel 20 and the light source 31. It is more preferable to set it as 1.2 times-8 times of the distance (T2) between these, and it is still more preferable to set it as 1.3 times-3 times.

(3) Placement relationship 3
In addition, the area of the display area 27 of the second display panel 20 is preferably larger than the area of the display area 17 of the first display panel 10.
This is because the light (L) from the light source 31 can be further effectively utilized by considering the area relationship between the first display panel 10 and the second display panel 20 in this way.
That is, if the first display panel 10 is small, it is easy to dispose the area avoiding the interference fringe generation area, and the influence of the interference fringes in the display area 17 as the image display area in the first display panel 10 is reduced. It can be reduced as much as possible.
Further, in the second display panel 20, the influence of such interference fringes is substantially eliminated, and the end position C of the display area 27 of the second display panel 20 can be brought closer to the light source 31. The display area 27 as the image display unit can be enlarged.
Therefore, the display areas 17 and 2 in the first display panel 10 and the second display panel 20 are displayed.
By taking the area of 7 into consideration, the size restriction on the first and second display panels 10 and 20 can be reduced while eliminating the influence of interference fringes.

4). Manufacturing Method An electro-optical device (liquid crystal device) 1 according to this embodiment includes a light guide plate 32 housed in a frame 6, a light source 31 for making light (L) incident on the light guide plate 32, It can be obtained by a method of manufacturing the electro-optical device 1 including an illumination device including the first display panel 10 and the second display panel 20.
More specifically, the inclined portion 32b whose thickness is gradually increased toward the light source 31 is changed to the end portion 32a.
The first display panel 10 and the second display panel 20 are arranged on both surfaces of the light guide plate 32, the step of preparing the light guide plate 32 provided in the step, the step of housing the light guide plate 32 and the light source 31 in the frame 6, And arranging the second display panel 20 with the light guide plate 32 in the arranging step.
The first display panel 10 is disposed on the side of the light guide plate 32 that is not provided with the inclined portion 32b, and the display area of the second display panel 20 is provided. 2
7 than the end position D of the display area 17 of the first display panel 10, the end position C of the light source 31.
The method of manufacturing the electro-optical device 1 is characterized in that the electro-optical device 1 is disposed close to the substrate.

That is, including the following steps 1) to 4), and in step 4), the second display panel 20 is disposed on the surface side provided with the inclined portion 32b of the light guide plate 32 and the light guide plate 32 is inclined. The first display panel 10 is arranged on the surface side not provided with the part 32b, and the end position C of the display area 27 of the second display panel 20 is set to the position of the display area 17 of the first display panel 10. The method of manufacturing the electro-optical device 1 is characterized by being closer to the light source 31 than to the end position D.
1) Step of preparing the light guide plate 32 provided with the end portions 32a with the inclined portions 32b that gradually increase in thickness toward the light source 31 (light guide plate preparation step).
2) Step of preparing the frame 6 (frame preparation step)
3) Step of housing the light guide plate 32 in the frame 6 (light guide plate housing step)
4) Arrangement process of arranging the first display panel 10 and the second display panel 20 on both surfaces of the light guide plate 32 (panel arrangement process)

(1) Light Guide Plate Preparation Step In the light guide plate preparation step, the inclined portion 32b whose thickness is gradually increased toward the light source 31 is changed to the end portion 32.
This is a step of preparing the light guide plate 32 provided for a.
That is, the light guide plate 32 partially shown in FIGS. 10A to 10B is prepared by a conventionally known method such as an injection molding method and prepared.

(2) Frame Preparation Step Next, the light source 3 for making the light (L) incident on the light guide plate 32 or the light guide plate 32.
1 is a step of preparing a frame 6 for housing 1. That is, the frame 6 is prepared by a conventionally known method such as an injection molding method and is prepared.
Further, in the frame preparation process, as shown in FIGS. 2 and 5, the inclined portion 3 of the light guide plate 32.
It is preferable to prepare a frame 6 having a frame protrusion 6a for covering the surface along 2b.
The reason for this is that by using the frame 6 having a specific structure in this manner, the frame protruding portion 6a of the frame 6 and the inclined portion 32b of the light guide plate 32 can be engaged. This is because not only the fixing property is improved, but also the light (L) from the light source 31 can be used more effectively.
As described above, when preparing the frame 6, the light reflecting portion 33 is provided between the frame protruding portion 6 a and the inclined portion 32 b of the light guide plate 32, or the frame protruding portion 6 a is connected to the light reflecting member. It is also preferable to comprise from.

(3) Light guide plate accommodation step Next, in the light guide plate accommodation step, the light guide plate 32 is accommodated in the frame 6 by engaging the frame protrusion 6 a of the frame 6 and the inclined portion 32 b of the light guide plate 32. It is.
That is, as shown in FIG. 2 and the like, the light guide plate 32 is inserted into the frame 6 and accommodated in a predetermined position.

(4) Panel Arrangement Step Next, the panel arrangement step is a step of arranging the first display panel 10 and the second display panel 20 on both surfaces of the light guide plate 32.
That is, as shown in FIG. 2 and the like, the second display panel 20 is connected to the inclined portion 32b of the light guide plate 32.
The first display panel 10 is disposed on the surface side (non-inclined portion surface) of the light guide plate 32 that is not provided with the inclined portion 32b. The end position C of the display area 27 of the second display panel 20 is arranged so as to be closer to the light source 31 than the end position D of the display area 17 of the first display panel 10.
Accordingly, the end portion 32a of the light guide plate 32 is thus provided with the inclined portion 32b having a predetermined shape, and the end positions C, C of the display areas 17, 27 of the first and second display panels 10, 20 are provided.
By manufacturing the liquid crystal device 1 in consideration of the relationship of D, the influence of the interference fringes is substantially eliminated in the second display panel 20, and also in the first display panel 10,
The influence of interference fringes in the display area 17 as an image display area can be reduced as much as possible. That is, the liquid crystal device 1 that is less affected by interference fringes can be manufactured efficiently and inexpensively.

(5) FPC board mounting process, etc. The first display panel 1 after the above-described panel arranging process or before the panel arranging process.
As shown in FIGS. 3 and 4, the FPC board 3 is mounted on the end portions of the 0 and the second display panel 20 via a conductive material (not shown) for connecting external terminals.

Further, the light source circuit board 31 as shown in FIG. 9 is not limited to the FPC board 3 shown in FIGS.
It is also preferable to use a ′ as it is for external terminal connection.
That is, when the first display panel 10 and the second display panel 20 are thinned, the light source circuit board 31a is inserted as shown in FIG. 12 with the bending member 100 inserted as shown in FIG. It is preferable that 'is mounted through a conductive material (not shown) and reversed.
This is because the light source circuit board 31a ′ and the FPC board 3 for connecting the external terminals are combined to save a great deal of space. Further, the light source circuit board 31a ′
This is because the rebound resilience is increased even when the light source circuit board 31 a ′ is considerably thin, because the rebound resilience can be suppressed by the action of the bending member 100.

In order to further suppress the resilience, the bending member 100 and the light source circuit board 31 are used.
It is preferable to provide the bending member 100 with an adhesive layer or a pressure-sensitive adhesive layer 100c in order to fix the gap between a ′.
In addition, it is preferable that the bending member 100 shown in FIG. 11 is configured using a film-like material made of a metal material such as stainless steel or aluminum, a ceramic material, or a plastic material.

[Second Embodiment]
The second embodiment is an electronic apparatus including the electro-optical device (liquid crystal device) 1 of the first embodiment.
FIG. 13 is a schematic configuration diagram showing the overall configuration of the electronic apparatus of the present embodiment. The electronic apparatus includes a display panel 200A provided in the liquid crystal device 200 and control means 2 for controlling the display panel 200A.
00B. The control unit 200B includes a display information output source 1210, a display processing circuit 1220, a power supply circuit 1230, and a timing generator 1240.
The display information output source 1210 includes a ROM (Read Only Memory) and a RAM (Random Acc).
ess Memory), a storage unit composed of a magnetic recording disk, an optical recording disk, and the like, and a tuning circuit that tunes and outputs a digital image signal, based on various clock signals CLK generated by the timing generator 1240. The display information is supplied to the display processing circuit 1220 in the form of a predetermined format image signal or the like.

The display processing circuit 1220 includes 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, and executes processing of input display information to display the image. Control means 200B together with information on clock signal CLK
To the drive circuit and the like. Furthermore, the drive circuit can include a first electrode drive circuit, a second electrode drive circuit, and an inspection circuit. The power supply circuit 1230 has a function of supplying a predetermined voltage to each of the above-described components.
And if it is the electronic device of this embodiment, while providing the edge part 32a of the light-guide plate 32 with the inclination part 32b which becomes thick sequentially toward the light source 31, the area | region where the said inclination part 32b was formed is provided. By providing the inclined portion 32b or the curved surface portion to adjust the refraction angle of the light (L) on at least a part of the surface facing the light source 31, the illumination device has uniform light emission luminance and excellent optical reliability. It can be set as the electronic device containing.

According to the present invention, an inclined portion having a predetermined shape is provided at the end portion of the light guide plate, the positional relationship between the inclined portion of the light guide plate and the double-sided display panel, and the end position relationship between the double-sided display panels. Therefore, it is possible to provide a double-sided display type electro-optical device and an electronic apparatus including such an electro-optical device, which are less affected by the generation of interference fringes.
Therefore, according to the electro-optical device and the like of the present invention, a liquid crystal device including a switching element such as a TFT element or a TFD element and an electronic device using the same, for example, a liquid crystal television, a mobile phone, a personal computer, etc. Viewfinder type / monitor direct view type video tape recorder, car navigation device, pager, electrophoresis device, electronic notebook, calculator,
Word processors, workstations, videophones, POS terminals, electronic devices with touch panels, devices with electron-emitting devices (FED: Field Emission Display and SCEED
: Surface-Conduction Electron-Emitter Display).

It is a figure for demonstrating the liquid crystal device of 1st Embodiment. It is a schematic sectional drawing which shows the liquid crystal device of 1st Embodiment. It is a figure provided in order to demonstrate the surface side of the liquid crystal device of 1st Embodiment. It is a figure provided in order to demonstrate the back surface side of the liquid crystal device of 1st Embodiment. It is a figure provided in order to demonstrate the flame | frame used for 1st Embodiment. It is a figure provided in order to demonstrate the generating position of the interference fringe in the liquid crystal device of 1st Embodiment. It is a schematic sectional drawing which shows the modification of the liquid crystal device of 1st Embodiment. (A)-(b) is a figure provided in order to demonstrate the light source circuit board carrying a light source. It is a figure provided in order to demonstrate another aspect of a light source circuit board. (A)-(b) is a figure provided in order to demonstrate the refractive state of the light in the light-guide plate used for the liquid crystal device of 1st Embodiment. It is a figure provided in order to demonstrate the plate for bending of a flexible circuit board. It is a figure provided in order to demonstrate the state which mounted the flexible circuit board. It is a schematic block diagram which shows the whole structure of the electronic device of 2nd Embodiment. It is a figure provided in order to demonstrate the conventional liquid crystal display device of a double-sided display type.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electro-optical apparatus (liquid crystal device) 2 ... Housing | casing 3 ... Flexible circuit board (FPC board)
4 ... Driver IC, 5 ... Electronic component, 6 ... Frame, 6a ... Frame protrusion, 10 ... First
Display panel 11, 12 ... substrate, 13 ... sealing material, 14 ... liquid crystal layer (electro-optical material), 1
5... Exit side polarizing plate, 20... Second display panel, 21, 22... Substrate, 23.
... Ejection side polarizing plate, 30 ... illuminating device, 31 ... light source, 31a, 31a '... light source circuit board, 32
... Light guide plate, 32a ... End, 32b ... Inclined part, 40 ... Light absorbing member, 40a ... Opening part, 100
... Bending member, 101 ... Boss, 200 ... Liquid crystal device, 200A ... Display panel, 200B ...
Control means, 1210 ... display information output source, 1220 ... display processing circuit, 1230 ... power supply circuit,
1240: Timing generator.

Claims (6)

An electro-optical device comprising a light source, a light guide plate, a first display panel, and a second display panel,
The light guide plate is provided with an inclined portion that gradually increases in thickness toward the light source at the end,
While arranging the second display panel on the side of the light guide plate provided with the inclined portion,
Disposing the first display panel on the surface side of the light guide plate not provided with the inclined portion; and
An electro-optical device, wherein an end position of a display area of the second display panel is disposed closer to the light source than an end position of the display area of the first display panel. The electro-optical device according to claim 1, wherein an area of a display area of the second display panel is larger than an area of a display area of the first display panel. 3. The frame according to claim 1, further comprising a frame that accommodates the light guide plate, wherein the frame is provided with a frame protrusion for covering the surface of the frame along the inclined portion of the light guide plate. The electro-optical device described. The electro-optical device according to claim 3, wherein a light reflecting portion is provided between the frame protruding portion and the inclined portion of the light guide plate. The electro-optical device according to claim 3, wherein the frame protruding portion is formed of a light reflecting member.   An electronic apparatus comprising the electro-optical device according to claim 1.

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