JP4379502B2 - 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 an electro-optical device that is less affected by interference fringes due to a frame protrusion, 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. 15, 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 disposed 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.
Therefore, the inventors of the present invention have made utmost efforts and provided a slope having a predetermined shape at the end of the light guide plate and using a frame provided with a frame protrusion for covering the slope of the light guide plate. The inventors have found that the influence of interference fringes can be reduced and completed the present invention.
That is, according to the present invention, not only a double-sided display panel but also a single-sided display panel is provided with an electro-optical device that is less affected by interference fringes, and an electronic apparatus including such an electro-optical device. Is one of the purposes.

Application Example 1 According to this application example, an illumination device including a light guide plate housed in a frame made of a light reflecting member , a light source for causing light to enter the light guide plate, and a display The light guide plate has an inclined portion that gradually increases in thickness toward the light source at the end of the light source, and the frame is integrated with the frame. to be formed, have a frame projecting portion facing the inclined portion of the light guide plate, the display panel within the thickness of the frame opposite to the light guide plate and opposite sides of the frame protrusions electro-optical device part is arranged, characterized in Rukoto is provided, it is possible to solve the problems described above.
In other words, the frame protrusion provided on the frame effectively reflects the light leaked from the inclined portion, thereby reducing the influence of interference fringes in the first display panel and the second display panel. In addition, the light from the light source can be further effectively used to constitute an electro-optical device with high emission luminance.
In addition, the frame protrusion provided on the frame improves the fixing property of the second display panel, and even when the ambient temperature rises, the positional deviation is reduced, and the electro-optic with high emission luminance A device can be configured.

Application Example 2 In configuring the electro-optical device according to the application example, the frame protrusion is formed along the inclination of the light guide plate, and the inclination angle of the light guide plate and the angle of the frame protrusion are Are preferably equal.
With such a configuration, the occurrence position of the interference fringes can be controlled by considering the angle of the frame protrusion, and the influence of the 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 electro-optical device includes a first display panel and a second display panel having different display areas, and the light guide plate includes the first display panel and the second display panel. A second display panel having a relatively large display area is disposed on the surface side provided with the inclined portion, and a display area having a relatively small display area is provided on the surface side not provided with the inclined portion of the light guide plate. is arranged first display panel, the display panel is the second display panel der Rukoto are preferred.
With this configuration, it is possible to obtain a double-sided display type electro-optical device that is less affected by interference fringes in the first display panel and the second display panel having different display areas.

Application Example 4 In configuring the electro-optical device according to the application example, the end position of the display area of the second display panel is lighter than the end position of the display area of the first display panel. It is arranged on the side.
With this configuration, even if light leakage occurs in the inclined portion, the second display panel can be adjusted so that interference fringes are generated in the vicinity of the light source.

Application Example 5 In configuring the electro-optical device according to the application example described above, a light reflection unit (including a light scattering unit, including a light scattering unit) is provided between the frame protrusion and the inclined portion of the light guide plate. The same is true).
By providing such a light reflecting portion at a 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 6 In configuring the electro-optical device according to the application example described above, the frame protruding portion is configured of a light reflecting member (including a light scattering member; the same applies hereinafter). preferable.
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 7 An electronic apparatus according to this application example includes the electro-optical device described above.
In other words, an electronic apparatus including a single-sided display type or a double-sided display type electro-optical device that is less affected by interference fringes and has high emission luminance can be provided.

Hereinafter, 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 and does not limit the present invention, 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 guide plate 32 housed in the frame 6, a light source 31 for making light (L) incident on the light guide plate 32, and In an electro-optical device (liquid crystal device) 1 including a lighting device 30 including a display panel 10 and a display panel 20,
The light guide plate 32 has an inclined portion that gradually increases in thickness toward the light source 31, and the frame 6 has a frame protruding portion 6a that faces the inclined portion 32b of the light guide plate 32. 1.
Hereinafter, a double-sided display type 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. In FIG. 1, the inclined portion 32 b of the light guide plate 32 is simplified and described, but in FIG. 2 and the like, the light guide plate 32 having the inclined portion 32 b is emphasized.

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 illumination device 30 includes a light source 31 and a light guide plate 32, and the first display panel 1.
0 and the second display panel 20 are used as a common backlight.

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 made of a conductive material (not shown) at the ends of the first display panel 10 and the second display panel 20. Has been implemented. 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 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.
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, or the like and traveling from the first display panel 10 side toward the second display panel 20 can be absorbed.
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.

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.
The light source 31 mounted on the light source circuit board 31a electrically connected to each display panel 20 and the light (L) emitted from the light source 31 for the first display panel 10 and the second display panel And a light guide plate 32 for efficiently guiding the light guide 20.

(1) Frame As shown in FIG. 5, the frame 6 includes a frame protruding portion 6 a for covering the surface along the inclined portion 32 b of the light guide plate 32, and the light source circuit board 31 a and the light guide plate 32. Alternatively, it is not particularly limited as long as it can accommodate a light diffusing plate (not shown) or the like and protect them, but for example, a rectangular structure having an outer frame is preferable.
This is because the use of the frame 6 having such a specific structure improves the fixing property of the second display panel 20.
In addition, as shown in FIG. 2, by providing the frame protruding portion 6a at a predetermined position (position along the inclined portion 32b of the light guide plate 32), light leaked from the inclined portion 32b of the light guide plate 32 (
Since L2 ′) can be effectively reflected, the influence of the generation of interference fringes on the second display panel 20 or the like can be reduced. Therefore, the electro-optical device 1 with high emission luminance can be configured by effectively using the light (L) from the light source 31.

Here, with reference to FIG. 6, the effect of providing the frame protrusion 6a at a predetermined position of the frame 6 will be described in more detail.
FIG. 6 is a diagram for explaining the occurrence position of interference fringes in the liquid crystal device 1 of 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 protruding portion 6a shown in FIG. 6 or 2 and the horizontal direction is set to a value within a range of 1 ° to 40 ° in accordance with the angle of the inclined portion 32b formed on the light guide plate 32. It is preferable.
The reason for this is that by considering the angle of the frame protrusion 6a in this way, the occurrence position of the interference fringes can be controlled, and the influence of the interference fringes on the second display panel 20 and the like can be further reduced. Because.
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 °.
The angle of the frame protruding portion 6a is engaged with the inclined portion 32b of the light guide plate 32, and the light guide plate 32 is engaged.
It is preferable that the angle is substantially the same as that of the inclined portion 32b of the light guide plate 32 so that the surface of the inclined portion 32b can be covered in parallel.

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.
The reason is that by providing the light reflecting portion 33 at a predetermined position, the inclined portion 32b of the light guide plate 32 is provided.
This is because light leakage from the light can be effectively prevented, while the influence of interference fringes on the second display panel 20 and the like can be further reduced.
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 frame protruding portion 6a is made of a light reflecting member.
This is because the structure of the frame is 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. Note that the entire frame is preferably made of such a metal material or composite resin.

(2) Light Source Circuit Board As the light source circuit board 31a accommodated in the frame 6, a flexible circuit board on which the light source 31 is mounted is a typical example, as shown in FIGS.
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.
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 saves space in the liquid crystal device 1. This is because it contributes to an increase in the mountable area of the light source circuit board 31a ′.
Furthermore, with such a light source circuit board 31a ′ composed of a plurality of layers, not only the mounting property and alignment property with respect to the frame 6 are improved, but also the alignment with the light guide plate 32 becomes easy and accurate. is there.

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.
Further, 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 laterally, and a connector 31i ′ is provided so that an external terminal can be electrically connected thereto. Is provided, and the tip of the extending portion 31g ′ is further folded downwardly oppositely to provide 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.
The boss 101 of the bending member 100 shown in FIG. 4 is engaged, and the light source circuit board 31a ′ is 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.

(3) Light Guide Plate As shown in FIG. 10A, the inclined portion 32b is used as a light guide plate for uniformly guiding the light (L) to the first and second display panels 10, 20 and the like. The light guide plate 32 having the above is used.
Here, the light guide plate 32 is a plate material made of a light transmissive material such as an acrylic resin,
A diffusion sheet 34, a first prism sheet 35, and a second prism sheet 36 are sequentially provided on the side where the first display panel 10 is disposed.
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. Therefore, such a diffusion sheet 34 can make the surface brightness of the light emitted from the light guide plate 32 uniform, and the first prism sheet 35 and the second prism sheet 35.
It is possible to effectively prevent the grooves of the prism sheet 36 and the reflection of uneven shapes (brightness unevenness).
The first prism sheet 35 and the second prism sheet 36 have a configuration in which one surface side (the first display panel 10 side) of a flat plate material made of a transparent acrylic resin is a prism surface, for example, The prism surface is formed with periodic irregularities (not shown) in the shape of side triangular waves.

Then, as shown in FIG. 10A, in the light guide plate 32, the end portion 32 of the light guide plate 32.
In a, an inclined portion 32 b is provided 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 (liquid crystal device) 1 having a high emission luminance value and 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 °. ° ~ 1
More preferably, the value is within a range of 5 °.
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 portion where the interference fringes are generated can be brought closer to the light source 31, and thereby the outside of the display areas 17 and 27. The place where interference fringes are generated can be driven away. That is, even when the areas of the first display panel 10 and the second display panel 20 are relatively increased, 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. Arrangement relation of liquid crystal panel (1) Arrangement relation 1
Further, as shown in FIG. 2 and the like, the second display panel 20 is arranged on the surface side of the light guide plate 32 provided with the inclined portion 32b, and the surface side of the light guide plate 32 not provided with the inclined portion 32b is provided. The first display panel 10 is arranged, and the end position C of the display area 27 of the second display panel 20 is
It is preferable to be closer to the light source 31 than the end position D of the display area 17 of the first display panel 10.
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
Considering the relationship between the end positions of the first and second display panels 10 and 20, even if light leakage occurs in the inclined portion 32b and passes through the frame protruding portion 6a, L in FIG.
This is because the interference fringes can be generated at the end position of the second display panel 20 as indicated by 2 ′.

Further, referring to FIG. 6, in the configuration example shown in FIG. 6, the end position C of the display area 27 of the second display panel 20 is the end position of the display area 17 of the first display panel 10. Position D
Even if light leakage occurs in the inclined portion 32b by approaching the light source 31, the interference fringes appear on the light source 3 as indicated by the arrow L4 in the second display panel 20.
It is understood that adjustments can be made to occur in the vicinity of 1.
At the same time, in the configuration example shown in FIG. 6, it is understood that the first display panel 10 is adjusted so that the interference fringes are generated at a position relatively far from the light source 31 as indicated by the arrow L3. .

Therefore, as shown in FIG. 2 or FIG. 6, the relationship between the end position C of the display area 27 of the second display panel 20 and the end position D of the display area 17 of the first display panel 10 is considered. As a result, the first display panel 10 can be arranged 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 can be allowed. It can be reduced as much as possible.
Similarly, by considering the relationship between the end position C of the display area 27 of the second display panel 20 and the end position D of the display area 17 of the first display panel 10, the second display Panel 2
At 0, since the influence of the interference fringes is substantially eliminated, the end position C of the display area 27 of the second display panel 20 can be brought closer to the light source 31, and the second display panel 2
The display area 27 as a zero image display unit can be enlarged.
The end position D of the display area 17 of the display panel 10 and the end position C of the display area 27 of the second display panel 20 can be defined as the positions of the seal portions, respectively. Any part other than the seal part may be used as long as it can be recognized as an end part of the display area.

(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 first display panel 10 and the second display panel 20 and the light source 31, the light from the light source 31 (L
) 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
Further, it is preferable that the area of the display area 27 of the second display panel 20 is relatively 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, by considering the areas of the display regions 17 and 27, the light (L) from the light source 31 can be effectively utilized while eliminating the influence of interference fringes.

4). Manufacturing Method of Liquid Crystal Panel An electro-optical device (liquid crystal device) 1 according to this embodiment includes a light guide plate 32 housed in a frame 6 and a light source 31 for causing light (L) to enter the light guide plate 32. And a method for manufacturing the electro-optical device 1 including the illumination device.
More specifically, as the light guide plate 32, a step of preparing a light guide plate 32 having an end portion 32 a having an inclined portion 32 b that gradually increases in thickness toward the light source 31, and an inclined portion 32 b of the light guide plate 32. Along the step of preparing a frame having a frame protrusion 6a for covering the surface thereof;
The step of accommodating the light guide plate 32 in the frame 6 by engaging the frame protruding portion 6 a of the frame 6 and the inclined portion 32 b of the light guide plate 32, and the display panels 10 and 20 along the light guide plate 32. It can manufacture by including the arrangement | positioning process to arrange | position.

That is, including the following steps 1) to 4), and in step 4), the second display panel 20 is disposed on the surface side of the light guide plate 32 including the inclined portion 32b, and includes the inclined portion 32b. The first display panel 10 is disposed on the surface of the light guide plate 32 that is not, 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) A step of preparing the frame 6 having the frame protruding portion 6a for covering the surface along the inclined portion 32b of the light guide plate 32 (frame preparation step).
3) Engage the frame protruding portion 6a of the frame 6 with the inclined portion 32b of the light guide plate 32,
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 frame preparation step is a step of preparing the frame 6 having the frame protruding portion 6a for covering the surface along the inclined portion 32b of the light guide plate 32.
That is, the frame 6 shown in FIG. 5 and the like is prepared by a conventionally known method such as an injection molding method and is prepared.
The reason for this is that the use of the frame 6 having a specific structure not only improves the fixing property of the first display panel 10 but also effectively prevents light leakage at the inclined portion 32b of the light guide plate 32. This is because the light (L) from 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 or FIG. 5 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 etc., the 2nd display panel 20 is arrange | positioned at the surface side (slope part surface) of the light-guide plate 32 provided with the inclination part 32b, and the light-guide plate 32 which is not provided with the inclination part 32b.
The first display panel 10 is disposed on the surface side (non-inclined portion surface) of the second display panel 20.
The end position C of the display area 27 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, by providing the inclined portion 32b having a predetermined shape at the end portion 32a of the light guide plate 32 in this way and considering the relationship between the end portion positions of the plurality of display panels 10 and 20, the liquid crystal device is manufactured. In the second display panel 20, the influence of the interference fringes is substantially eliminated, and also in the first display panel 10, the influence of the interference fringes in the display area 17 as an image display area is as much as possible. Can be reduced. 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 another form of the first embodiment. As illustrated in FIG. 13, the light (L) is applied to the light guide plate 32 accommodated in the frame 6 and the light guide plate 32. In an electro-optical device (liquid crystal device) 1 ′ including an illumination device 30 including a light source 31 for incidence and a display panel 10 ′, an inclined portion 32 b that gradually increases in thickness toward the light source 31. In the end portion 32a of the light guide plate 32, and the frame 6 is provided with a frame protruding portion 6a for covering the surface of the frame 6 along the inclined portion 32b of the light guide plate 32.
It is.
Therefore, the second embodiment is a single-sided display type liquid crystal device including only one display panel.
That is, the light leaked from the inclined portion 32b by the frame protrusion 6a provided on the frame 6 (L
By effectively reflecting 2 ′), the influence of interference fringes in the first and second display panels 10 and 20 can be reduced, and the light (L) from the light source 31 can be used more effectively. In addition, a liquid crystal device 1 ′ having high emission luminance can be provided.
In addition, the frame protrusion 6a provided on the frame improves the fixing property of the light guide plate 32, and even when the ambient temperature rises, the positional deviation is reduced, and the liquid crystal device 1 with higher light emission luminance is obtained. 'Can be configured.
In addition, since the other structure of 2nd Embodiment can refer to the liquid crystal device of 1st Embodiment of a double-sided display type, description here is abbreviate | omitted.

[Third Embodiment]
The third embodiment of the present invention is an electronic apparatus including the electro-optical device (liquid crystal device) of the first embodiment.
FIG. 14 is a schematic configuration diagram showing the overall configuration of the electronic apparatus of the present embodiment. This electronic apparatus includes a liquid crystal panel 200A provided in the liquid crystal device 200 and control means 2 for controlling the liquid crystal 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. An electronic device including an illuminating device having uniform light emission luminance and excellent optical reliability by providing an inclined portion 32b or a curved surface portion to adjust the light refraction angle on at least a part of a surface facing the light source 31. It can be a device.

According to the present invention, not only a double-sided display panel but also an inclined portion having a predetermined shape is provided at an end portion of the light guide plate, and a frame provided with a frame protruding portion for covering the inclined portion of the light guide plate is used. That is, an electro-optical device that is less affected by interference fringes even with a single-sided display panel,
In addition, an electronic apparatus provided with such an electro-optical device can be provided.
Further, by taking into consideration the arrangement relationship of the double-sided display panel with respect to the light guide plate and the positions of the respective ends, an electro-optical device that is less affected by interference fringes, and an electronic device including such an electro-optical device are provided. I was able to do that.
Therefore, according to the electro-optical device or 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 of the liquid crystal device of 1st Embodiment. It is a figure provided in order to demonstrate the back surface 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 the light source circuit board carrying a light source. (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 for demonstrating the liquid crystal device of 2nd Embodiment. It is a schematic block diagram which shows the whole structure of the electronic device of 3rd 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 1,1 '... Electro-optical apparatus (liquid crystal device), 2 ... Housing | casing, 3 ... Flexible circuit board (FPC)
Substrate), 4 ... driver IC, 5 ... electronic component, 6 ... frame, 6a ... frame protrusion, 10
DESCRIPTION OF SYMBOLS 1st display panel, 11, 12 ... Board | substrate, 13 ... Sealing material, 14 ... Liquid crystal layer (electro-optical material), 15 ... Ejection side polarizing plate, 20 ... 2nd display panel, 21, 22 ... Substrate, 23 DESCRIPTION OF SYMBOLS ... Sealing material, 25 ... Emission side polarizing plate, 30 ... Illuminating device, 31 ... Light source, 31a, 31a '... Light source circuit board, 32 ... Light guide plate, 32a ... End part, 32b ... Inclined part, 40 ... Light absorption member, 40a ... opening,
DESCRIPTION OF SYMBOLS 100 ... Bending member, 101 ... Boss, 200 ... Liquid crystal device, 200A ... Liquid crystal panel, 20
0B ... control means, 1210 ... display information output source, 1220 ... display processing circuit, 1230 ... power supply circuit, 1240 ... timing generator.

Claims (5)

An illumination device including a light guide plate housed in a frame made of a light reflecting member, a light source for allowing light to enter the light guide plate, and display areas disposed on both sides of the light guide plate are relative to each other. A first display panel having a relatively small size and a second display panel having a relatively large display area ,
The light guide plate has, on the surface facing the second display panel, an inclined portion that gradually increases in thickness toward the light source at an end on the light source side,
The frame is integrally formed with the frame, has a frame protrusion facing the inclined portion of the light guide plate, and the thickness of the frame opposite to the surface of the frame protrusion facing the light guide plate An electro-optical device, wherein a part of the second display panel is disposed within the range.   The electro-optical device according to claim 1, wherein the frame protrusion is formed along an inclination of the light guide plate, and an inclination angle of the light guide plate is equal to an angle of the frame protrusion. 3. The electro-optic according to claim 1, wherein an end position of the display area of the second display panel is arranged closer to the light source than an end position of the display area of the first display panel. apparatus. The electro-optical device according to claim 1 , wherein a light reflecting portion is provided between the frame protruding portion and the inclined portion of the light guide plate. An electronic apparatus comprising the electro-optical device according to claim 1 .

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