KR20130004138A - Liquid crystal device, electronic apparatus and lighting device - Google Patents

Abstract

PURPOSE: A liquid crystal display, and an electronic device and a lighting device are provided to receive the light coming from a light emitting device in a light guide plate portion and to prevent the light from excessively diffusing. CONSTITUTION: A lighting device(8) includes a light guide plate(80) and light emitting devices(89). The light guide plate includes a first side(812) and a second side(811) having a longer length than the first side in a first direction. Light guide plate portions(81,82) are arranged in a second direction. Each light guide plate portion includes light emitting devices. The light emitting devices receive the light of a light source formed in the light guide plate portion from the cross section of the first side.

Description

Liquid crystal devices, electronic devices and lighting devices {LIQUID CRYSTAL DEVICE, ELECTRONIC APPARATUS AND LIGHTING DEVICE}

The present invention relates to a liquid crystal device having a lighting device and a liquid crystal panel, an electronic device having the liquid crystal device, and a lighting device thereof.

Among various liquid crystal devices, a liquid crystal device having a transmissive or transflective liquid crystal panel has a lighting device called a backlight device and a liquid crystal panel arranged on the side of the light exit surface of the lighting device. The illumination light emitted from the image is modulated by the liquid crystal panel to display an image. Therefore, in the illumination device, it is necessary to make the emission intensity distribution of illumination light uniform.

Therefore, in a lighting device in which a light emitting element is provided at an end of the light guide plate, a plurality of light emitting elements are provided along two sides facing each other in the first direction of the light guide plate, and the light emitting elements are arranged along one side. The structure which shifted the position and the position of the light emitting element arrange | positioned along the other side in the 2nd direction is proposed (refer patent document 1).

In addition, in controlling the emission intensity of the illumination light from the illumination device for each region, since the light is excessively diffused in the integrated light guide plate, for example, as shown in FIG. A plurality of rectangular light guide plate portions 81X are arranged in parallel in the second direction, which is a short side direction, and the light emitting element 89 is disposed at an end portion (light incident portion 88X) in the first direction of the light guide plate portion 81X. One configuration is proposed (see Patent Document 2).

On the other hand, as shown in FIG. 10 (b), although it is not a structure which controls the emission intensity of illumination light for every area | region, the several light guide plate part 82Y of the trapezoid shape from which the length of two sides opposing in a 1st direction differs is removed. The illuminating device which arrange | positioned in the 2nd direction opposite to the direction in 1 direction, and arrange | positioned the light emitting element 89 in the end surface (light incidence part 88Y) located in the long side of the light-guide plate part 82Y. Is proposed (refer patent document 3).

Japanese Patent Application Publication No. 2006-120361 Japanese Patent Application Publication No. 2009-163902 Japanese Patent Application Publication No. 2006-108045

However, in the case of the illuminating device described in Patent Literature 2, the size of the second direction of the light incident portion 88X of the light guide plate portion 81X is larger than that of the second direction of the light emitting element 89. Therefore, when the illumination light is emitted from the light guide plate portion 81X, the emission intensity of the illumination light from the portion facing the light emitting element 89 is large in the vicinity of the light incident portion 88X of the light guide plate portion 81X. However, there exists a problem that the emission intensity of illumination light tends to be low in the position shifted | deviated from this area to the 2nd direction. In addition, when employ | adopting the structure of patent document 3, the size of the 2nd direction of the light-incidence part 88Y of the light-guide plate part 82Y is the size of the light emitting element 89 more than the illumination apparatus of patent document 2 further. Since it is large compared with the size of two directions, the said problem is remarkable.

Therefore, when employ | adopting the structure of patent document 2 and patent document 3, while reducing the dimension of the light guide plate part 81X, 82Y in the 2nd direction, the light guide plate part 81X, 82Y and the light emitting element 89 ), And it is necessary to bring the size of the light guide plate portions 81X and 82Y in the second direction closer to the size of the light emitting element 89 in the second direction. However, in such a configuration, the cost of the lighting device or the liquid crystal device is increased. Is increased. In addition, in the structure of patent document 2 and patent document 3, by providing the light emitting element 89 in the position largely separated from the light-incidence part 88X, 88Y of the light-guide plate part 81X, 82Y, the light-guide plate part 81X, It is also conceivable to reduce the emission intensity difference of the illumination light in the vicinity of the light incidence portions 88X and 88Y of 82Y, but in this configuration, the dimension in the first direction of the illumination device becomes large. There is a problem such that it cannot be mounted on a liquid crystal device.

In view of the above problems, even if the plurality of light guide plate portions extending in the first direction are paralleled in the second direction, the number of light guide plate portions or light emitting elements is relatively small, and the dimensions in the first direction are relatively small. Even if it is small, it is providing the liquid crystal device which can aim at the uniformity of the emission intensity of illumination light, the electronic device provided with the liquid crystal device, and its illumination device.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, this invention is a liquid crystal device which has an illumination device and the liquid crystal panel arrange | positioned on the side of the light emission surface of this illumination device, The said illumination device is an in-plane direction of the said light emission surface. The light guide plate part of the planar shape which has the 1st side which opposes at least in the said 1st direction, and the 2nd side which is longer than the length of the 1st side among the 1st direction and 2nd direction which mutually mutually crosses, the light guide plate which adjoins in the said 2nd direction A plurality of light guide plates arranged so that the first side and the second side are adjacent to each other, and a plurality of light emitting elements for injecting light source light into the light guide plate portion from an end surface of the first side in each of the plurality of light guide plate portions. It is characterized by having.

In the liquid crystal device according to the present invention, in order to control the emission intensity of the illumination light from the illumination device for each region in association with driving to the liquid crystal panel, the light guide plate portion having a planar shape having different lengths of two sides opposing in the first direction. In the first direction, the light source light emitted from the light emitting element is incident from the end face positioned in the first direction in the light guide plate portion. For this reason, unlike the case where an integrated light guide plate is used, the light source light can be suppressed from being excessively diffused, and therefore the emission intensity of the illumination light can be appropriately controlled for each region. Here, a light emitting element makes light source light inject into light guide plate part from the end surface located in a 1st side side (short side) among two sides opposing in the 1st direction of a light guide plate part. For this reason, in the light guide plate part, the situation that the size of the end surface (light incidence part) which light source light enters in the 2nd direction becomes excessively large compared with the size of the 2nd direction of a light emitting element can be avoided. Therefore, even if the light emitting element is not excessively spaced in the first direction from the light incident portion of the light guide plate portion, the amount of incident light of the light source plate in the portion facing the light emitting element in the light guide plate portion and the position shifted from the region in the second direction. Car is small. Therefore, when the illumination light is emitted from the light guide plate portion, the emission intensity of the illumination light from the portion facing the light emitting element in the vicinity of the light incidence portion of the light guide plate portion and the emission of the illumination light from the position shifted in the second direction from this region The difference in strength is small Therefore, even when a plurality of light guide plate portions extending in the first direction are paralleled in the second direction, even if the number of the light guide plate portions and the light emitting elements is relatively small and the dimensions in the first direction are relatively small, the emission intensity of the illumination light can be equalized. can do.

In the present invention, the light guide plate portion may adopt a configuration in which the first side and the second side have a trapezoidal planar shape parallel to each other. According to this structure, since the light emitting elements are arranged linearly in the second direction on both sides of the first direction of the light guide plate, the configuration can be simplified, for example, the substrate on which the light emitting elements are mounted can be extended linearly. have.

In the present invention, the light guide plate portion extends in the first direction so as to be perpendicular to a quadrangle connecting one end portion of the first side and one end portion of the second side to the first side and the second side. The structure which extends and has the side edge which connects the other end part of the said 1st side and the other end part of the said 2nd side can be employ | adopted. According to such a structure, a light guide plate can be made square by arrange | positioning the light guide plate part so that the side edge orthogonal to two parallel sides may be arrange | positioned on the outer side of a 2nd direction.

In the present invention, it is preferable that a light scattering surface is formed between adjacent light guide plate portions among the plurality of light guide plate portions. According to such a structure, since some light leaks through the light-scattering surface from a light-guide plate part to a neighboring light-guide plate part, it can prevent that the emission intensity of illumination light changes abruptly in the boundary part of an adjacent light-guide plate part.

In the present invention, a configuration in which the light scattering surface is formed in a portion in the thickness direction of the light guide plate portion and the reflective surface is formed in another portion among the plurality of light guide plate portions is adjacent. Can be. According to such a structure, by adjusting the ratio which a light-scattering surface and a reflecting surface occupy, it is possible to adjust the light amount which leaks from a light-guide plate part to a neighboring light-guide plate part, and the amount of light reflected by a reflection surface and returning to a light-guide plate part. Therefore, it is possible to suppress the sudden change in the emission intensity of the illumination light at the boundary portion of the adjacent light guide plate portion and to optimize the light amount of the illumination light emitted from the light guide plate portion.

In this invention, you may employ | adopt the structure in which the said light-scattering surface is formed in one part in the thickness direction of the said light-guide plate part among the said light-guide plate parts, and the clearance gap is formed in another part among the said light-guide plate parts. . According to this configuration, while reflection occurs at the interface between the end face of the light guide plate portion and the air layer in the gap, some light enters the adjacent light guide plate portion through the gap. Therefore, by adjusting the ratio of the light scattering surface and the gap, the amount of light leaking from the light guide plate portion to the neighboring light guide plate portion and the amount of light reflected from the interface between the end surface of the light guide plate portion and the air layer in the gap can be adjusted. . Therefore, it is possible to suppress the sudden change in the emission intensity of the illumination light at the boundary portion of the adjacent light guide plate portion and to optimize the light amount of the illumination light emitted from the light guide plate portion.

In this invention, you may employ | adopt the structure in which the clearance gap is formed between the adjacent light guide plate parts among the said light guide plate parts. According to this configuration, while reflection occurs at the interface between the end face of the light guide plate portion and the air layer in the gap, some light enters the adjacent light guide plate portion through the gap. Therefore, it is possible to suppress the sudden change in the emission intensity of the illumination light at the boundary portion of the adjacent light guide plate portion and to optimize the light amount of the illumination light emitted from the light guide plate portion.

In the present invention, the plurality of light guide plate portions may adopt a configuration in which the thickness dimension is continuously changed in the first direction.

In this case, it is preferable that the some light guide plate part has the thickness dimension extended toward the side of a said 1st side from the side of a said 2nd side. According to such a structure, since incident light source light is easy to reach | attain with sufficient light quantity to the front end side of a light-guide plate part, the emission intensity of the illumination light radiate | emitted from a light-guide plate part can be aimed at.

In the present invention, the plurality of light guide plate portions are preferably arranged such that the first side and the second side are adjacent to any of the adjacent light guide plate portions. According to such a structure, since the advancing direction in the 1st direction of the light source light in a light guide plate turns alternately in a 2nd direction, there exists an advantage that brightness unevenness in a light guide plate hardly arises.

The liquid crystal device according to the present invention can be used as a display portion in various electronic devices.

In addition, the lighting apparatus according to the present invention includes a first side facing at least in the first direction and a length longer than the length of the first side among the first direction and the second direction crossing each other in the in-plane direction of the light exit surface. The light guide plate of the planar light guide plate which has two sides is arranged in multiple numbers so that the said 1st side and the said 2nd side may adjoin in adjacent light guide plate parts in the said 2nd direction, and the said 1st in each of the said light guide plate parts. It has a some light emitting element which makes light source light inject into the light guide plate part from the edge surface of a side. It is characterized by the above-mentioned.

In the illuminating device which concerns on this invention, in controlling the emission intensity of illumination light for every area | region, the light guide plate part which has a planar shape from which the length of the two sides opposing in a 1st direction differs in a 2nd direction to reverse a direction in a 1st direction And light source light emitted from the light emitting element from the end face positioned in the first direction in the light guide plate portion is incident in the light guide plate portion. For this reason, unlike the case where an integrated light guide plate is used, the light source light can be suppressed from being excessively diffused, and therefore the emission intensity of the illumination light can be appropriately controlled for each region. Here, a light emitting element makes light source light inject into light guide plate part from the end surface located in a 1st side side (short side) among two sides opposing in the 1st direction of a light guide plate part. For this reason, in the light guide plate part, the situation that the size of the end surface (light incidence part) which light source light enters in the 2nd direction becomes excessively large compared with the size of the 2nd direction of a light emitting element can be avoided. Therefore, even if the light emitting element is not excessively spaced in the first direction from the light incident portion of the light guide plate portion, the amount of incident light of the light source plate in the portion facing the light emitting element in the light guide plate portion and the position shifted from the region in the second direction. Car is small. Therefore, when the illumination light is emitted from the light guide plate portion, the emission intensity of the illumination light from the portion facing the light emitting element in the vicinity of the light incidence portion of the light guide plate portion and the emission of the illumination light from the position shifted in the second direction from this region The difference with the intensity is small. Therefore, even when a plurality of light guide plate portions extending in the first direction are paralleled in the second direction, even if the number of the light guide plate portions and the light emitting elements is relatively small and the dimensions in the first direction are relatively small, the emission intensity of the illumination light can be equalized. can do.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows the whole structure of the liquid crystal device which concerns on 1st Embodiment of this invention.
2 is an exploded perspective view of the liquid crystal device according to the first embodiment of the present invention.
It is explanatory drawing which shows the structure of the principal part of the lighting apparatus which concerns on 1st Embodiment of this invention.
It is explanatory drawing which shows the intensity | strength of the emission intensity at the time of emitting illumination light from one light guide plate part of the lighting apparatus which concerns on 1st Embodiment of this invention.
It is explanatory drawing which shows the planar structure of the lighting apparatus which concerns on 2nd Embodiment of this invention.
It is explanatory drawing which shows the planar structure of the lighting apparatus which concerns on 3rd Embodiment of this invention.
It is explanatory drawing which shows the cross-sectional structure of the lighting apparatus which concerns on the modification 1 of 1st Embodiment-3rd Embodiment of this invention.
It is explanatory drawing which shows the structure of the principal part of the lighting apparatus which concerns on the modification 2 of 1st Embodiment-3rd Embodiment of this invention.
It is explanatory drawing of the electronic device provided with the liquid crystal device which applied this invention.
10 is an explanatory diagram of a conventional lighting device.

EMBODIMENT OF THE INVENTION Embodiment of this invention is described with reference to drawings. In addition, in the drawings referred to in the following description, each layer or each member is made to a size that can be recognized on the drawing, and the scale is different for each layer or each member. In addition, in the following description, the direction which cross | intersects each other in the in-plane direction of a light guide plate or a liquid crystal panel is made into the X-axis direction and the Y-axis direction, and the direction which intersects in the X-axis direction and the Y-axis direction is called Z-axis direction. In addition, in the drawing referred to below, one side in the X-axis direction is made into the X1 side, the other side is made into the X2 side, one side in the Y-axis direction is made into the Y1 side, the other side is made the Y2 side, and one side in the Z-axis direction is made into the Z1 side ( The other side (side from which illumination light or display light is emitted) is shown as Z2 side (upper side).

[First Embodiment]

(Overall configuration)

1: is explanatory drawing which shows the whole structure of the liquid crystal device which concerns on 1st Embodiment of this invention, and FIG. 1 (a), (b) is a perspective view which shows the external appearance of a liquid crystal device, and sectional drawing of a liquid crystal device. to be. 2 is an exploded perspective view of the liquid crystal device according to the first embodiment of the present invention.

1 and 2, the liquid crystal device 100 of the present embodiment is of a transmissive type or semi-transmissive type which is substantially overlapped with a lighting device 8 called a backlight and an upper surface of the lighting device 8. The liquid crystal panel 10 is provided. In this embodiment, the liquid crystal panel 10 consists of a transmissive liquid crystal panel. In addition, the liquid crystal device 100 includes a resin frame 30 made of a resin that holds the liquid crystal panel 10 and the illumination device 8 inside, and a lower side (the opposite side to the display surface / Z of the resin frame 30). The lower metal frame 40 arrange | positioned at one side Z1 of an axial direction, and the upper metal frame 50 arrange | positioned at the upper side (side of display surface / the other side Z2 of a Z-axis direction) of the resin frame 30 are provided. . The resin frame 30 and the lower metal mold | die 40 may be integrally formed by insert molding or insert molding.

The liquid crystal panel 10 has a quadrangular planar shape, and has an element substrate 11 on which the pixel electrode 15 and the like are formed, and an opposing substrate disposed to face the element substrate 11 through a predetermined gap ( 12) and the sealing material 14 which joins the opposing board | substrate 12 and the element board | substrate 11 is provided. In such a liquid crystal panel 10, the liquid crystal layer 13 is held in a region surrounded by the sealing material 14. The element substrate 11 and the opposing substrate 12 are made of a light transmissive substrate such as a glass substrate. In the element substrate 11, a plurality of scanning lines (not shown) extend in the X-axis direction, while a plurality of data lines extend in the Y-axis direction, and at the intersection of the scanning lines and the data lines (not shown). Correspondingly, a switching element (not shown) and the pixel electrode 15 are provided.

In this embodiment, the opposing substrate 12 is disposed on the emission side of the display light, and the element substrate 11 is disposed on the side of the illumination device 8. The liquid crystal panel 10 is configured as a liquid crystal panel of a twisted nematic (TN) method, an electrically controlled irefringence (ECB) method, or a vertical aligned nematic (VAN) method, and the pixel electrode 15 is formed on the element substrate 11. The common electrode 16 is formed in the counter substrate 12. In this embodiment, the liquid crystal panel 10 is 3.5 inches diagonally and 320x480 pixels. In addition, when the liquid crystal panel 10 is an IPS (In Plane Switching) system or a FFS (Fringe Field Switching) system, the common electrode 16 is provided on the side of the element substrate 11. In addition, the element substrate 11 may be disposed on the emission side of the display light with respect to the opposing substrate 12. The upper polarizing plate 18 is disposed on the upper surface of the liquid crystal panel 10, and the lower polarizing plate 17 is disposed between the lower surface of the liquid crystal panel 10 and the illumination device 8.

In the element substrate 11, the driving IC 140 is mounted on the upper surface of the protruding portion 110 from the edge of the opposing substrate 12, and at the end of the protruding portion 110, a flexible substrate ( 200 is connected. The flexible substrate 200 is equipped with a display control IC 250 for outputting image data to the liquid crystal panel 10 and a light source driving IC 280 (light source driver) for controlling lighting of the lighting device 8. It is.

In this embodiment, the light source driving IC 280 controls the emission intensity of the illumination light from the illumination device 8 in association with the driving of the liquid crystal panel 10 for each region. More specifically, in the liquid crystal device 100 of the present embodiment, the emission intensity of the illumination light from the illumination device 8 is large in a region in which the image with high brightness is displayed in the liquid crystal panel 10, The local dimming method which makes the emission intensity of the illumination light from the illumination device 8 small in the area | region which displays an image with low brightness is employ | adopted. This operation is performed by controlling the drive current to the light emitting element 89 used by the light source driving IC 280 for the illumination device 8 under the control of the display control IC 250.

The lighting device 8 includes a rectangular light guide plate 80 overlapping the lower surface side of the liquid crystal panel 10, and a light emitting element 89 such as a light emitting diode that emits white light. Silver is a translucent resin plate made of acrylic resin, polycarbonate resin and the like. The flexible substrate 200 connected to the liquid crystal panel 10 is a double-sided substrate, and the light emitting element 89 is mounted on a strip portion 210 or the like extending from the flexible substrate 200. As will be described in detail later, the light guide plate 80 includes a light incident part 88, and the light source light emitted from the light emitting element 89 enters the light guide plate 80 from the light incident part 88. Thereafter, the light is emitted as illumination light from the light exit surface 85 on the upper surface while advancing in the light guide plate 80. In the illuminating device 8, the reflective sheet 187 is disposed on the lower surface of the light guide plate 80, and the optical surface such as the diffusion sheet 182 and the prism sheets 183 and 184 is disposed on the upper surface of the light guide plate 80. The sheets are arranged overlapping. In this embodiment, the two prism sheets 183 and 184 are arrange | positioned so that mutual ridgelines may mutually cross. For this reason, the illumination light emitted from the light exit surface 85 of the light guide plate 80 is diffused in all directions by the diffusion sheet 182, and then the liquid crystal panel (2) is used by the two prism sheets 183 and 184. The directivity which has a peak in the front direction of 10) is provided.

Thus, in this form, the light guide plate 80, the light emitting element 89, the strip | belt-shaped part 210 of the flexible substrate 200, the optical sheet (reflective sheet 187, the diffusion sheet 182, the prism sheet ( 183, 184] and the light source drive IC 280 (light source drive part), the illumination device 8 is comprised. Here, the strip-shaped portion 210 of the flexible substrate 200 extends along two sides facing each other in the light guide plate 80, and will be described later with reference to FIG. 3 and the like. Are arranged along the two sides facing each other in the light guide plate 80. The light source driving IC 280 (light source driver) selectively drives the plurality of light emitting elements 89 in association with driving to the liquid crystal panel, and controls the amount of emitted light of the illumination light from the light exit surface for each of the plurality of light guide plates. Doing.

In addition, the resin frame 30 has a rectangular frame shape, and is provided with four side walls 31 facing the side ends of the liquid crystal panel 10. A step portion 36 is formed inside the three side walls 31 among the four side walls 31. On the stepped part 36, the liquid crystal panel 10 is fixed by a double-sided tape or the like, and the light guide plate 80, the light emitting element 89, or the like of the lighting device 8 is disposed inside the stepped part 36. It is. The lower metal mold | die 40 is formed by press work etc. with respect to thin metal plates, such as an SUS board. The lower metal frame 40 includes a bottom plate portion 43 and four side plate portions 41 standing up from the outer circumference of the bottom plate portion 43, and has a rectangular box shape in which an upper surface thereof is opened. The resin frame 30 is held on the bottom plate portion 43 of the lower metal frame 40. Similarly to the lower metal frame 40, the upper metal frame 50 is formed by pressing or the like on a thin metal plate such as an SUS plate. The upper metal frame 50 is provided with a rectangular upper plate portion 53 and four side plate portions 51 bent downward from the outer circumference of the upper plate portion 53 and has a rectangular box shape in which the lower surface is opened. have. The side plate part 51 covers the side edge part of the liquid crystal panel 10, and the upper plate part 53 has covered the display light emission side of the liquid crystal panel 10. FIG. Here, a rectangular opening 530 for emitting light emitted from the liquid crystal panel 10 is formed in the upper plate portion 53 of the upper metal frame 50. For this reason, the upper plate part 53 of the upper metal frame 50 has covered the outer periphery edge part over the perimeter among the display light emission side of the liquid crystal panel 10. FIG. In the lower metal frame 40, the side plate part 41 is provided with the hook part 45 of the inclination-down direction by the cutting process with respect to the side plate part 41, and in the upper metal frame 50, the side plate In the part 51, the hook part 55 of the inclination upper direction is formed by the cutting process with respect to the side plate part 51. As shown in FIG. For this reason, in the state which overlapped the lower metal frame 40 and the upper metal frame 50 with respect to the liquid crystal panel 10, the lighting device 8, and the resin frame 30, the upper metal frame 50 was made into the lower metal frame When pressed toward 40, the hook parts 45 and 55 are automatically engaged, and the upper metal frame 50 and the lower metal frame 40 are engaged in the side plate parts 41 and 51. As shown in FIG.

(Detailed configuration of the lighting device 8)

3: is explanatory drawing which shows the structure of the principal part of the lighting apparatus 8 which concerns on 1st Embodiment of this invention, and FIG.3 (a), (b) shows the planar structure of the lighting apparatus 8, FIG. It is explanatory drawing which shows the state which cut | disconnected the lighting device 8 along explanatory drawing and the X1-X1 'line | wire of FIG. In addition, in the following description, a 1st direction, a 2nd direction, and a 3rd direction are the following directions, respectively.

1st direction = Y-axis direction

2nd direction = X-axis direction

3rd direction = Z-axis direction

Corresponds to In addition, a "first side" corresponds to the short side 812, and a "second side" corresponds to the long side 811.

As shown in FIG. 3, in the illuminating device 8 of the present embodiment, in the light guide plate 80, the Y-axis direction (first direction) and the X-axis that cross each other in the in-plane direction of the light exit surface 85. In the direction (second direction), a plurality of light guide plate portions 81 (81a to 81f) having a trapezoidal planar shape having two lengths opposed to each other in the Y-axis direction are arranged in parallel in the X-axis direction. The light emitting element 89 is disposed in the light guide plate portion 81 in a one-to-one relationship. In this embodiment, the light emitting element 89 is an LED (Light Emitting Diode) that emits white light, and emits light source light as divergent light.

Here, the plurality of light guide plates 81 are alternately arranged in the X-axis direction with the direction in the Y-axis direction reversed. For this reason, the direction in the Y-axis direction is reversed in any of the light guide plate parts 81 which adjoin among the some light guide plate parts 81. FIG. More specifically, the light guide plate portions 81a, 81c, and 81e of the plurality of light guide plate portions 81 have a long side 811 facing one side Y1 in the Y axis direction among the two sides opposing in the Y axis direction. The short side 812 faces the other side Y2 in the Y axis direction. On the other hand, in the light guide plate parts 81b, 81d, and 81f, the long side 811 is facing the other side Y2 in the Y-axis direction, and the short side 812 is facing the one side Y1 in the Y-axis direction. In addition, the plurality of light guide plate portions 81 all have the same shape, and extend in a direction orthogonal to the long side 811 and the short side 812, so that the ends of the long side 811 and the short side 812 are separated from each other. And a side edge 813 extending at an angle, and a side edge 814 extending at an angle to connect the other ends of the long side 811 and the short side 812. For this reason, when two light guide plate parts 81a and 81b are arrange | positioned so that the four sides 814 may contact, the light guide plate parts 81a and 81b become a rectangle extended toward a long side in a Y-axis direction. The same applies to other light guide plate portions (light guide plate portions 81c and 81d and light guide plate portions 81e and 81f). For this reason, the light guide plate 80 which has a rectangular planar shape can be comprised only by arrange | positioning the thing which combined the two light guide plate parts 81 so that the quadrilaterals 814 contact each other in the Y-axis direction.

In this embodiment, the light guide plate 81 has a thickness dimension of 1 mm and a length dimension of 75 mm in the Y-axis direction, and a length of the long side 811 is 13 mm and a length of the short side 812 is set. 4 mm. For this reason, the light guide plate has a plane size of 51 mm x 75 mm.

In arranging the light emitting element 89 in the light guide plate 80 configured as described above, in this embodiment, in any of the plurality of light guide plate portions 81, the end face located on the short side 812 side has a light incident portion. (88), and the light emitting element (89) faces the light emitting surface at the light incident portion (88). In the light guide plate 81, a scattering pattern is formed on a surface of the side on which the reflective sheet 187 is located, and in this embodiment, the density of the scattering pattern is spaced apart from the light emitting element 89. It is high. For this reason, the intensity distribution of the illumination light emitted from the light guide plate 81 is uniformized regardless of the distance from the light emitting element 89. As such a scattering pattern, the structure which formed the recessed recessed part in the surface of the light-guide plate part, the structure which printed the scattering member, etc. can be employ | adopted.

In this embodiment, the plurality of light guide plate portions 81 are each formed of independent resin plates, and the end faces corresponding to the side edges 813 and the quadrilateral 814 have light scattering surfaces with fine concavo-convex formed by scattering treatment. It becomes (821). For this reason, the light scattering surface 821 is formed between the light guide plate parts 81 and 82 which adjoin in a Y-axis direction. On the other hand, the end surface of the light guide plate portion 81 on the short side 812 side of the light incidence portion 88 is not scattered for the purpose of increasing the incidence efficiency of the light source plate into the light guide plate portion 81. It is a flat surface. In addition, in the light guide plate 81, the end face on the long side 811 side that faces the light incident part 88 is a flat surface, and thus reaches the end face on the long side 811 side. Light is reflected and propagates again in the light guide plate 81.

(Emission characteristics of lighting light)

4 is an explanatory diagram showing the emission intensity when the illumination light is emitted from one of the light guide plate portions 81 of the lighting apparatus 8 according to the first embodiment of the present invention. In the liquid crystal device 100 of the present embodiment, a local dimming method is employed, and the illumination device 8 sets the emission intensity of the illumination light to a large area in the liquid crystal panel 10 to display an image with high brightness. In the region displaying an image with low luminance, the illumination device 8 makes the emission intensity of the illumination light small. In this lighting operation, for example, as shown in FIG. 4, of the plurality of light guide plate portions 81, the light emitting element 89 provided in the light guide plate portion 81e is turned on, and both light emitting elements 89 are turned off. I was in a state.

In such a case, first, illumination light with uniform intensity is emitted from the light guide plate 81e regardless of the position. Here, each of the light guide plate portions 81 is made of an independent resin plate, and end faces corresponding to the side edges 813 and the quadrilateral 814 are scattering surfaces. For this reason, a part of the light traveling in the light guide plate 81e is emitted from the end faces corresponding to the side edges 813 and the quadrilateral 814 and enters the neighboring light guide plate portions 81d and 81f. For this reason, the emission intensity of illumination light decreases moderately between 82 (border parts) between adjacent light guide plate parts 81, and it can suppress that it changes suddenly.

(Main effect of this embodiment)

As described above, in this embodiment, the local dimming employs a trapezoidal planar shape in which the lengths of the two sides opposite in the Y-axis direction (first direction) are different in improving the image contrast and lowering the power consumption. The light guide plate 81 having the structure is arranged in the X-axis direction (second direction) with the direction in the Y-axis direction reversed. Further, in the light guide plate 81, light source light emitted from the light emitting element 89 is incident into the light guide plate 81 from an end surface positioned in the Y-axis direction. For this reason, unlike the case where an integrated light guide plate is used, the light source light can be suppressed from being excessively diffused, and therefore the emission intensity of the illumination light can be appropriately controlled for each region.

Here, the light emitting element 89 injects light source light into the light guide plate 81 from an end face located on the short side 812 side of the light guide plate 81. For this reason, in the light guide plate part 81, the situation that the size of the end surface (light incidence part 88) in which light source light injects becomes excessively large compared with the size of the light emitting element 89 in the X-axis direction. Can be avoided. Therefore, even if the light emitting element 89 is not excessively spaced apart from the light incident portion 88 of the light guide plate portion 81, the portion of the light guide plate portion 81 that faces the light emitting element 89 and X from such a region. The difference in the amount of incident light of the light source light is small at the position shifted in the axial direction. Therefore, when the illumination light is emitted from the light guide plate portion 81, the emission intensity of the illumination light from the portion facing the light emitting element 89 in the vicinity of the light incident portion 88 of the light guide plate portion 81, and such The difference with the emission intensity of the illumination light from the position shift | deviated to the X-axis direction from an area | region is small. Therefore, even when a plurality of light guide plate portions 81 extending in the Y axis direction are arranged in the X axis direction, the number of the light guide plate 81 and the light emitting element 89 is relatively small, and the illumination device in the Y axis direction ( In the state where the dimension of 8) is comparatively small, the emission intensity of illumination light can be equalized.

In addition, in this embodiment, since the light scattering surface 821 is formed between 82 between adjacent light guide plate parts 81, some light leaks from the light guide plate part 81 to the adjacent light guide plate part 81. FIG. do. For this reason, it can suppress that the emission intensity of illumination light changes abruptly in the boundary part of the adjacent light-guide plate part 81. FIG. Therefore, an image of high quality can be displayed.

The light guide plate 81 has a trapezoidal planar shape in which two sides (the long side 811 and the short side 812) are parallel to each other, so that the light emitting elements are provided on both sides of the light guide plate 80 in the Y-axis direction. It is arranged that 89 is linearly arranged in the X-axis direction. Therefore, the structure can be simplified, for example, the board | substrate (the strip | belt-shaped part 210 of the flexible substrate 200) in which the light emitting element 89 was mounted can be extended linearly. The plurality of light guide plate portions 81 includes a quadrilateral 814 and side edges 813 extending so as to be perpendicular to two sides (long sides 811 and short sides 812). For this reason, the light guide plate 80 can be made into a rectangle only by arrange | positioning the light guide plate part 81 so that the side edge 813 may be arrange | positioned outside.

In this embodiment, in forming the light scattering surface 821 between the light guide plate portions 81 adjacent to each other in the Y-axis direction, both the side edges 813 and the quadrilateral 814 are light scattering surfaces. Although it is set to (821), even if the side surface 813 or the quadrilateral 814 of one light guide plate 81 is formed as a light scattering surface 821 among the light guide plate 81 adjacent to the Y-axis direction. do. In such a configuration, the light scattering surface 821 is used as the light scattering plate portion 81 adjacent to each other in the Y-axis direction. Therefore, both the side edges 813 and the quadrilateral 814 are used as the light scattering surface 821. The same effect as in the case of the above can be obtained. In the case where only the side surface 813 or the quadrilateral 814 of one of the light guide plate portions 81 is the light scattering surface 821 among the light guide plate portions 81 adjacent to the Y-axis direction, scattering treatment is required. Since the object to be limited is limited, productivity can be improved.

In this embodiment, a configuration in which the end face on the long side 811 side facing the light incident part 88 is a flat surface is adopted, but the end face on the long side 811 side is a scattering surface or a reflective surface. In this case, the utilization efficiency of the light propagated in the light guide plate 80 can be improved.

[Second Embodiment]

FIG. 5: is explanatory drawing which shows the planar structure of the lighting apparatus 8 which concerns on 2nd Embodiment of this invention. In the first embodiment, although the local dimming method was adopted, in this embodiment, the local dimming is adopted, and as shown by the arrow Y0, it is linked to the operation of scanning pixels sequentially in the liquid crystal panel 10. This is an example of the scan backlight which shifts the area | region which the illumination light from the illumination device 8 exits. To this end, in the following description, the first direction, the second direction and the third direction are respectively the following directions

1st direction = X-axis direction

2nd direction = Y-axis direction

3rd direction = Z-axis direction

Corresponds to However, since the basic structure of this embodiment is the same as that of 1st Embodiment, the same code | symbol is attached | subjected to a common part, and those description is abbreviate | omitted.

As shown in FIG. 5, in the illuminating device 8 of the present embodiment, the arrangement direction of the light guide plate 81 is rotated by 90 ° with respect to the first embodiment, and the number of the light guide plate 81 is increased. Has a configuration More specifically, the light guide plate 80 has a plurality of light guide plate portions 81 (81a to 81h) having a trapezoidal planar shape having different lengths of two parallel sides facing in the X-axis direction so as to be parallel to the Y-axis direction. The light emitting element 89 is arranged in such a light guide plate portion 81 in a one-to-one relationship.

Here, the plurality of light guide plate portions 81 are alternately arranged in the Y-axis direction opposite to the direction in the X-axis direction. For this reason, the direction in the Y-axis direction is reversed in any of the light guide plate parts 81 which adjoin among the some light guide plate parts 81. FIG. The plurality of light guide plate portions 81 have the same shape, and include side edges 813 and quadrilaterals 814 orthogonal to the long sides 811 and the short sides 812. For this reason, when adjacent light guide plate parts 81a and 81b are arrange | positioned so that the four sides 814 may contact, the light guide plate parts 81a and 81b become a rectangle extended toward a long side in a Y-axis direction. The same applies to other light guide plates (light guide plate portions 81c and 81d, light guide plate portions 81e and 81f and light guide plate portions 81g and 81h). For this reason, the light guide plate 80 has a rectangular planar shape.

In this embodiment, the light guide plate 81 has a thickness dimension of 1 mm and a length dimension of 51 mm in the X-axis direction, and a length of the long side 811 is 15 mm and a length of the short side 812 is set. 4 mm. For this reason, the light guide plate has a plane size of 51 mm x 76 mm.

In arranging the light emitting element 89 in the light guide plate 80 configured as described above, also in this embodiment, similarly to the first embodiment, the light guide element is positioned on the short side 812 side in any of the plurality of light guide plate portions 81. The end face is a light incident portion 88, and the light emitting element 89 faces the light emitting surface. In the light guide plate 81, a scattering pattern is formed on a surface on which the reflective sheet 187 is located, and the intensity distribution of the illumination light emitted from the light guide plate 81 is determined from the light emitting element 89. Irrespective of the distance, it is uniform. In addition, each of the plurality of light guide plate portions 81 is made of an independent resin plate, and the end faces corresponding to the side edges 813 and the quadrilateral 814 have light scattering surfaces 821 having fine irregularities formed by scattering treatment. It is. For this reason, the light scattering surface 821 is formed between 82 between the light guide plate parts 81 adjacent to the Y-axis direction. On the other hand, in the light guide plate part 81, both the end surface of the short side 812 side which became the light incident part 88, and the end surface of the long side 811 side which oppose the light incident part 88 are flat. It is made of cotton.

In this embodiment, similarly to the first embodiment, in forming the light scattering surface 821 between the light guide plate portions 81 adjacent in the Y-axis direction, the side edges 813 and the quadrilaterals 814 ) Are both light scattering surfaces 821, but the side surface 813 or the quadrilateral 814 of one of the light guide plate portions 81 is the light scattering surface 821 among the light guide plate portions 81 adjacent to the Y-axis direction. You may employ | adopt the structure which becomes. In such a configuration, the light scattering surface 821 is used as the light scattering plate portion 81 adjacent to each other in the Y-axis direction. Therefore, both the side edges 813 and the quadrilateral 814 are used as the light scattering surface 821. The same effect as in one case can be obtained. In the case where only the side surface 813 or the quadrilateral 814 of one of the light guide plate portions 81 is the light scattering surface 821 among the light guide plate portions 81 adjacent to the Y-axis direction, scattering treatment is required. Since the object to be limited is limited, productivity can be improved. In this embodiment, similarly to the first embodiment, a configuration in which the end face on the long side 811 side facing the light incident part 88 is a flat surface is adopted, but the end on the long side 811 side is adopted. The constitution in which the lower surface is a scattering surface or a reflecting surface may be adopted. In this case, the utilization efficiency of the light propagated in the light guide plate 80 can be improved.

As described above, in this embodiment, local dimming is used to improve image contrast and lower power consumption, while employing a scan backlight method to lower power consumption, and to face in the X-axis direction (first direction). The light guide plate 81 having a trapezoidal planar shape having different lengths of two parallel sides is arranged in the Y-axis direction (second direction) with the direction in the Y-axis direction reversed. Further, in the light guide plate 81, light source light emitted from the light emitting element 89 is incident into the light guide plate 81 from an end surface positioned in the X-axis direction. For this reason, unlike the case where an integrated light guide plate is used, the light source light can be suppressed from being excessively diffused, and therefore the emission intensity of the illumination light can be appropriately controlled for each region. In addition, when the scan backlight method is adopted, the scanning in the liquid crystal panel 10 is synchronized with the scanning of the backlight, so that afterimages and the like when a moving image is displayed can be alleviated.

In addition, the light emitting element 89 causes light source light to enter the light guide plate 81 from an end surface positioned on the short side 812 side of two parallel sides opposing in the X-axis direction of the light guide plate 81. . For this reason, in the light guide plate part 81, it is said that the size of the end surface (light incidence part 88) in which the light source light enters is excessively large compared with the size of the light emitting element 89 in the Y axis direction. The situation can be avoided. Therefore, even if the light emitting element 89 is not excessively spaced apart from the light incident portion 88 of the light guide plate portion 81, the portion of the light guide plate portion 81 facing the light emitting element 89 and Y from such a region. The difference in the amount of incident light of the light source light is small at the position shifted in the axial direction. Therefore, when the illumination light is emitted from the light guide plate portion 81, the emission intensity of the illumination light from the portion facing the light emitting element 89 in the vicinity of the light incident portion 88 of the light guide plate portion 81, and such The difference with the emission intensity of the illumination light from the position shifted from the area | region to the Y-axis direction is small. Therefore, even when a plurality of light guide plate portions 81 extending in the X axis direction are arranged in the Y axis direction, the number of the light guide plate 81 and the light emitting elements 89 is relatively small, and the illumination device in the X axis direction ( In the state where the dimension of 8) is comparatively small, the emission intensity of illumination light can be equalized.

In addition, in this embodiment, since the light scattering surface 821 is formed between 82 between adjacent light guide plate parts 81, some light leaks from the light guide plate part 81 to the adjacent light guide plate part 81. FIG. do. For this reason, the same effect as 1st Embodiment is exhibited, such that it can suppress that the emission intensity of illumination light changes abruptly in the boundary part of the adjacent light-guide plate part 81. FIG.

[Third embodiment]

FIG. 6: is explanatory drawing which shows the planar structure of the lighting apparatus 8 which concerns on 3rd Embodiment of this invention, and FIG. 6 (a), (b) uses the liquid crystal device 100 in a horizontal view state. It is explanatory drawing which shows how to make, and explanatory drawing which shows the mode of using the liquid crystal device 100 in a vertical view state. In addition, since the basic structure of this embodiment is the same as that of 1st Embodiment and 2nd Embodiment, the same code | symbol is attached | subjected to a common part, and those description is abbreviate | omitted.

As shown in FIG. 6A, in the liquid crystal device 100 including the illumination device 8 of the present embodiment, the diagonal of the image display area of the liquid crystal panel 10 is 3.5 inches and is 320 × 480. It has the number of pixels. In addition, the size of the light guide plate 80 is 51 mm x 75 mm, and thickness is 1 mm. In this embodiment, the light guide plate 80 of the lighting device 8 has a configuration in which the number of light guide plate portions 81 is reduced to six in the light guide plate 80 according to the second embodiment. The liquid crystal device 100 having such an illumination device 8 is used in a horizontal viewing state when displaying a moving image such as a TV. In this horizontal viewing state, in the illuminating device 8 of the present embodiment, as shown by the arrow SY, the backlight is scanned from the upper side to the lower side of the screen, which is the same as the scanning direction in the liquid crystal panel 10. Therefore, afterimage and the like when displaying a moving image can be alleviated, and the effect of local dimming can be obtained.

In such a configuration, as shown in FIG. 6B, when the liquid crystal device 100 is rotated 90 degrees to the vertical view state, the backlight is scanned from the left side to the right side of the screen as indicated by the arrow SX. Done. Even in such a case, the vertical image often displays character information and the like as a still image, and therefore, even if the backlight is scanned from the left side to the right side of the screen, problems such as afterimages are unlikely to occur.

[Modified Example 1 of First to Third Embodiments]

FIG. 7: is explanatory drawing which shows the cross-sectional structure of the lighting apparatus 8 which concerns on the modified example 1 of 1st Embodiment-3rd Embodiment of this invention. In addition, since the basic structure of this embodiment is the same as that of 1st Embodiment-3rd Embodiment, the same code | symbol is attached | subjected to a common part, and those description is abbreviate | omitted.

In the first to third embodiments, each of the plurality of light guide plate portions 81 is formed of an independent resin plate, and the entire surface of the end faces corresponding to the side edges 813 and the quadrilateral 814 is a light scattering surface. In this embodiment, as shown in FIG. 7A, light is scattered to a part in the thickness direction of the light guide plate 80 between 82 adjacent to the light guide plate 81. The surface 821 is formed, and the reflective surface 822 is formed in another part. In this embodiment, between the light guide plate portions 81 adjacent to each other, about 1/3 of the light guide plate 80 in the thickness direction of the light guide plate 80 serves as the light scattering surface 821. About two thirds of the remaining portions are the reflection surface 822. Such a reflecting surface 822 can be realized by a configuration in which a reflective layer such as aluminum is formed, or a configuration in which a part of the end surface of the light guide plate 81 is mirrored. In addition, the reflecting surface 822 may be formed at the side of the light output surface 85, for example, and may be formed at the intermediate position in the thickness direction of the light guide plate 80.

According to this configuration, by adjusting the ratio of the light scattering surface 821 and the reflecting surface 822, the amount of light leaking from the light guide plate 81 to the neighboring light guide plate 81 through the light scattering surface 821 and The amount of light reflected by the reflective surface 822 and returned to the light guide plate 81 can be adjusted. For example, light leaking from the light guide plate 81 to the adjacent light guide plate 81 through a light scattering surface 821 to a region corresponding to 10 to 20 pixels can be reached. Therefore, it is possible to suppress the sudden change of the emission intensity of the illumination light between the adjacent light guide plate 81 (82) (boundary portion), and to optimize the amount of light emitted from the light guide plate 81. can do.

In this embodiment, in forming the light scattering surface 821 and the reflecting surface 822 between the adjacent light guide plate portions 81, both of the light guide plate portions 81 adjacent in the Y-axis direction. Although the light scattering surface 821 and the reflective surface 822 were formed in the above, the light scattering surface 821 and the reflective surface 822 may be formed in one of the light guide plate portions 81. In such a configuration, since the light scattering surface 821 and the reflecting surface 822 are combined between the light guide plate portions 81 adjacent to each other in the Y-axis direction, the light scattering surface is formed on both of the light guide plate portions 81 adjacent to each other. The same effects as in the case of forming 821 and the reflective surface 822 can be obtained. At this time, if the light scattering surface 821 is formed in one light guide plate 81 among the light guide plate 81 adjacent to the Y-axis direction, and the reflective surface 822 is formed in the other light guide plate 81 The manufacturing process of the light guide plate 80 can be simplified.

In the light guide plate 80 shown in FIG. 7B, a light scattering surface 821 is formed in a portion in the thickness direction of the light guide plate 80 between 82 between adjacent light guide plate portions 81. A gap 823 is formed in the other part. In this embodiment, between 82 of adjacent light guide plate parts 81, about 1/2 in the thickness direction of the light guide plate 80 from the light exit surface 85 becomes the gap 823, and the remaining about 1/2 is the light scattering surface 821. Such a gap 823 can be realized by providing a stepped portion in the end face of the light guide plate 81, and the inside of the gap 823 is an air layer. In addition, the gap 823 may be formed on the side where the reflective sheet 187 is located, for example.

According to this configuration, while reflection occurs at the interface between the end face of the light guide plate 81 and the air layer in the gap 823, some light enters the neighboring light guide plate 81 through the gap 823. do. Therefore, by adjusting the ratio of the light scattering surface 821 and the gap 823, the amount of light leaking from the light guide plate 81 to the neighboring light guide plate 81, and the end surface and the gap (of the light guide plate 81) The amount of light reflected at the interface with the air layer in 823 and returned to the light guide plate 81 can be adjusted. Therefore, it is possible to suppress the sudden change in the emission intensity of the illumination light between the adjacent light guide plate 81 (82) (boundary portion), and to reduce the amount of light emitted from the light guide plate 81. Can be optimized

Here, it is preferable that the part used as the gap 823 in the light guide plate 81 is a flat surface. According to such a structure, light can be reflected efficiently, and light utilization efficiency can be improved. In the formation of the light scattering surface 821 and the gap 823 between the adjacent light guide plate portions 81, the light scattering surface (a) is formed on both of the light guide plate portions 81 adjacent in the Y-axis direction. 821 and the gap 823 are formed, but the light scattering surface 821 and the notch (gap 823) may be formed in one of the light guide plate portions 81. In such a configuration, the light scattering surface 821 and the gap 823 are combined between the light guide plate portions 81 adjacent to each other in the Y-axis direction, so that the light scattering surface ( 821 and the gap 823 can be obtained in the same effect. In that case, the light scattering surface 821 is formed in one light guide plate 81 among the light guide plate 81 adjacent to the Y-axis direction, and a notch (gap 823) is formed in the other light guide plate 81. When formed, the manufacturing process of the light guide plate 80 can be simplified.

In the light guide plate 80 shown in FIG. 7C, the entirety between the adjacent light guide plate portions 81 is a gap 823. According to this configuration, while reflection occurs at the interface between the end face of the light guide plate 81 and the air layer in the gap 823, some light enters the neighboring light guide plate 81 through the gap 823. do. Therefore, the amount of light leaking from the light guide plate 81 to the neighboring light guide plate 81 is reflected at the interface between the end surface of the light guide plate 81 and the air layer in the gap 823 and returns to the light guide plate 81. The amount of light can be adjusted. Therefore, it is possible to suppress the sudden change in the emission intensity of the illumination light between the adjacent light guide plate 81 (82) (boundary portion), and to reduce the amount of light emitted from the light guide plate 81. Can be optimized

Here, it is preferable that the part used as the gap 823 in the light guide plate 81 is a flat surface. According to such a structure, light can be reflected efficiently, and light utilization efficiency can be improved. Moreover, the light scattering surface is formed in the end surface of one light guide plate 81 among the light guide plate 81 adjacent to the Y-axis direction via the clearance 823, and the end surface of the other light guide plate 81 May be a flat surface.

[Modification 2 of the first to third embodiments]

FIG. 8: is explanatory drawing which shows the principal part structure of the lighting apparatus which concerns on the modification 2 of 1st Embodiment-3rd Embodiment of this invention. In addition, since the basic structure of this embodiment is the same as that of 1st Embodiment-3rd Embodiment, the same code | symbol is attached | subjected to the part which is common, and it demonstrates and abbreviate | omits the description.

In the first to third embodiments, the thickness of the light guide plate portion 81 is constant, but as shown in FIGS. 8A and 8B, the plurality of light guide plate portions 81 have a thickness dimension. You may employ | adopt the structure which changes continuously in a 1st direction (direction which the long side 811 and the short side 812 oppose). Here, in the light guide plate 80 shown in FIG. 8A, the thickness dimension of the light guide plate portion 81 is continuously increased from the side of the long side 811 to the side of the short side 812. In contrast, in the light guide plate 80 shown in FIG. 8B, the thickness dimension of the light guide plate portion 81 is continuously decreased from the side of the long side 811 to the side of the short side 812.

In such a structure, in the case of the structure shown to Fig.8 (a), after the light source light radiate | emitted from the light emitting element 89 enters the light guide plate part 81, it is easy to reach with sufficient light quantity to the front end side. Therefore, there is an advantage that the emission intensity of the illumination light emitted from the light guide plate 81 can be made uniform.

[Other Embodiments]

In the above embodiment, the light guide plate 81 has a side edge 813 and a quadrilateral 814 orthogonal to the long side 811 and the short side 812, but has a trapezoid having two quadrilaterals. It may be a shape. In the above embodiment, the light guide plate portions 81 in which the directions in the first direction are opposite to each other are alternately arranged in the second direction. For example, the light guide plate portions 81 in which the directions in the first direction are opposite to each other are disposed. You may arrange | position two in a 2nd direction.

[Mounting example to electronic equipment]

Next, an electronic device to which the liquid crystal device 100 according to the above embodiment is applied will be described. The structure of the mobile telephone 3000 is shown in FIG. The mobile phone 3000 includes a plurality of operation buttons 3001, a scroll button 3002, and a liquid crystal device 100 as a display unit. By operating the scroll button 3002, the screen displayed on the liquid crystal device 100 is scrolled. The configuration of the information portable terminal 4000 is shown in Fig. 9B. The information portable terminal 4000 includes a plurality of operation buttons 4001, a power switch 4002, and a liquid crystal device 100 as a display unit. When the power switch 4002 is operated, various kinds of information such as an address book and a schedule unit are displayed.

As the electronic device to which the liquid crystal device 100 is applied, in addition to the electronic devices shown in FIGS. 9A and 9B, the liquid crystal television 2000 shown in FIG. The display of the PC 1000 shown in d) can be illustrated. Moreover, in addition to the electronic apparatus shown in FIG. 9, a car navigation apparatus, a pager, an electronic notebook, an electronic calculator, a word processor, a workstation, a digital still camera, a video telephone, a POS terminal, etc. are mentioned, The display part of these various electronic apparatuses is mentioned. As the above, the liquid crystal device 100 described above is applicable.

8: Lighting device
10 liquid crystal panel
80 light guide plate
81: light guide plate
85: light exit surface
88: light incident part
89: light emitting element (light source)
100: liquid crystal device
811 long side (second side)
812: short side (first side)
821: light scattering surface
822 reflective surface
823: gap

Claims (12)

A liquid crystal device having a lighting device and a liquid crystal panel arranged on the side of a light exit surface of the lighting device,
The illumination device includes:
A planar light guide plate having a first side facing at least in the first direction and a second side longer than the length of the first side among at least a first direction and a second direction crossing each other in an in-plane direction of the light exit surface. A plurality of light guide plates arranged so that the first side and the second side are adjacent to each other in the light guide plate portions adjacent to each other in the second direction;
Each of the said light guide plate part has a some light emitting element which makes light source light inject into the light guide plate part from the cross section of the said 1st side, The liquid crystal device characterized by the above-mentioned. The liquid crystal device according to claim 1, wherein the light guide plate portion has a trapezoidal planar shape in which the first side and the second side are parallel to each other. The said light guide plate part is a quadrilateral which extends in the said 1st direction, and connects one edge part of the said 1st edge | side, and one edge part of the said 2nd edge | side, The said 1st side and the said 2nd And a side edge extending so as to be perpendicular to the side and connecting the end of the other side of the first side and the end of the other side of the second side. The liquid crystal device according to any one of claims 1 to 3, wherein a light scattering surface is formed between adjacent light guide plate portions among the plurality of light guide plate portions. The said light scattering surface is formed in a part in the thickness direction of the said light-guide plate part among the said light-guide plate parts, and the reflecting surface is formed in the other part among the said light-guide plate parts. Liquid crystal device. The light scattering surface is formed in a part in the thickness direction of the light guide plate part among the plurality of light guide plate parts, and a gap is formed in the other part. , Liquid crystal device. The liquid crystal device according to any one of claims 1 to 3, wherein a gap is formed between adjacent light guide plate portions among the plurality of light guide plate portions. The liquid crystal device according to any one of claims 1 to 7, wherein the plurality of light guide plate portions are continuously changed in thickness in the first direction. The liquid crystal device according to claim 8, wherein the plurality of light guide plate portions are increased in thickness from the side of the second side toward the side of the first side. The liquid crystal device according to any one of claims 1 to 9, wherein the plurality of light guide plate portions are arranged such that the first side and the second side are adjacent to each other in the adjacent light guide plate portion. . The liquid crystal device as described in any one of Claims 1-10 is provided in the display part, The electronic device characterized by the above-mentioned. A planar light guide plate portion having a first side facing at least in the first direction and a second side longer than the length of the first side among at least a first direction and a second direction crossing each other in an in-plane direction of the light exit surface, A plurality of light guide plates arranged so that the first side and the second side are adjacent to each other in the light guide plate portions adjacent to each other in the second direction;
Each of the said light guide plate part has a some light emitting element which makes light source light inject into the light guide plate part from the cross section of the said 1st side, The illuminating device characterized by the above-mentioned.

Images