JP5270985B2 - LIGHTING DEVICE AND LIQUID CRYSTAL DISPLAY DEVICE USING THE SAME - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illumination device capable of performing area-wise control by dividing a display screen into an arbitrary number of parts to respond to a larger screen, and of achieving lower power consumption, and to provide a liquid crystal display device using the same. <P>SOLUTION: The illumination device includes light extraction means 3a, 3b, d1, d2 that are disposed on a side opposite to that where an irradiation target 1 of light guide plates 2a, 2b is disposed, and reflect light leaked from the light guide plates 2a, 2b or light advancing in the light guides 2a, 2b towards the irradiation target 1, wherein a plurality of the light guide plates 2a, 2b are provided in layers, light sources Kl1, Kr1 are disposed towards the light guide plates 2a, 2b and are provided for each divided region: r1, r2, r3, r4, into which the illumination region G of the illumination target 1 is divided, and the light extraction means 3a, 3b, d1, d2 are at least provided in a lamination direction opposite to the divided regions without being superimposed. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an illuminating device for displaying an image used for a television, a mobile phone or the like, and a liquid crystal display device using the same.

In recent years, liquid crystal display devices widely used in televisions, mobile phones, etc. are characterized by a short and thin depth as a flat panel display compared to conventional cathode ray tube type display devices that emit electron beams. It has become.
12A is a front view of the conventional liquid crystal television 100, and FIG. 12B is a diagram illustrating the light guide plate 102 disposed on the back side of the display screen Gh in the conventional liquid crystal television 100 and both outer sides of the light guide plate 102. It is the conceptual front view which showed the structure of the light source k arrange | positioned in the direction.

  In order to make further use of this thin feature, the liquid crystal display device is a direct type system in which a light source that transmits light from the rear side of the conventional voltage-controlled liquid crystal panel 101 is disposed behind the display screen Gh (see FIG. 12A). On the other hand, recently, in order to further utilize the thin features, as shown in FIG. 12 (a), the light source k is arranged on both outer sides of the display screen Gh, and the light from the light sources k on both outer sides is arranged. A side light system is used in which light is diffused and diffusely reflected using a light guide plate 102 (see FIG. 12B) or the like, and light is guided as a surface light source from the rear of the liquid crystal panel 101 (see FIG. 12A).

  By the way, in the liquid crystal television 100 having a direct light source, the display screen Gh is divided into a plurality of regions r by dividing the display screen Gh in the vertical and horizontal directions, and a light source k is provided and managed for each region r as shown in FIG. However, by adjusting the brightness for each region r, area control for improving the contrast for each region r in accordance with the image data of each region r and improving the moving image performance of the liquid crystal television 100 is being adopted. This area control has an advantage that power consumption can be reduced because the light source k is turned on for each region r.

FIG. 12C is a front view showing a direct light source and area division of Patent Document 1.
On the other hand, Patent Document 2 describes a configuration in which two light guide plates are provided so as to overlap each other and a linear light source is provided below each light guide plate (see FIGS. 1 to 3 of Patent Document 2).
JP 2008-59863A (FIGS. 8, 12, etc.) Japanese Unexamined Patent Publication No. 2004-286803 (FIGS. 1-3, etc.)

By the way, as shown in FIG. 12B, when the light guide plate 102 is formed as a single piece, the light emitted from the light source k spreads in the light guide plate 102 as shown by the arrow α102 and in the display screen Gh. It is possible to control the area of the display screen Gh (refer to FIG. 12A) in the vertical direction (vertical direction in FIG. 12A), but the display screen Gh is divided into a desired number of horizontal directions. Control is impossible. Therefore, there is a limit to reducing power consumption by area control.
In recent years, the liquid crystal television 100 tends to have a large screen. However, when the display screen Gh (see FIG. 12A) is enlarged, the light from the light source k arranged on both outer sides of the display screen Gh. There is a disadvantage that the light diffuses and it is difficult to reach the center of the display screen Gh, which is inappropriate for increasing the size of the liquid crystal television 100.

  On the other hand, as shown in FIG. 12C, the configuration of Patent Document 1 has a structure in which the light source k is disposed behind the display screen Gh and diffuses light upward, so that the space required for homogenization is in the depth direction. The size in the thickness direction of the liquid crystal television 100 (paper surface, front and back direction in FIG. 12C) is increased. For this reason, the liquid crystal television 100 is not suitable for thinning, including the recent wall-mounted television.

Patent Document 2 is a configuration in which two light guide plates are provided so as to overlap each other, and a linear light source is provided below each light guide plate, and the vertical direction of the display screen Gh (see FIG. 12A) (FIG. 12A). ) On the display screen Gh, but the display screen Gh cannot be divided in the horizontal direction (FIG. 12 (a)). It is.
In view of the above circumstances, the present invention can divide a display screen into an arbitrary number to perform area control, can cope with a large screen, and can reduce power consumption and a liquid crystal display device using the same. For the purpose of provision.

In order to achieve the above object, a lighting device according to the first aspect of the present invention includes a light source that emits light, and guides the light from the light source over an extending direction toward an irradiation target in a direction perpendicular to the extending direction. An illumination device comprising a transparent light guide plate that emits light guided and an optical sheet that makes the light that has passed through the light guide plate uniform light directed to the irradiation target, the irradiation target of the light guide plate being disposed The light guide plate is disposed on the opposite side of the light guide plate and includes light extraction means for reflecting light leaking from the light guide plate or light traveling through the light guide plate toward the irradiation target. The light extraction means is provided at each position of the light guide plate at a position along the side end surface of the light guide plate and divided the illumination area to be irradiated. It is provided without overlapping, and each divided area is individually light Comprising a light intensity control means capable of controlling time, light guide plate, opposite the divided areas of the light guide target for guiding light from a light source, a surface opposite to the side where the irradiation target is placed Is formed so as to gradually approach the irradiation target as it goes to the center side, and as a light extraction means, a reflection pattern or a reflection groove part goes to the center side at a position opposite to the divided area that the light guide plate takes. The degree of parallelism of the light from the light source toward the light guide target is formed in the optical path of the light guide plate up to the light extraction means, and the width gradually increases as the distance from the light source increases. A collimator portion is formed to increase

The liquid crystal display device according to the second aspect of the present invention includes a light source that emits light, and guides the light from the light source over the extending direction and the light guided toward the irradiation target in the extending direction and the vertical direction. An illumination device comprising a transparent light guide plate that emits light and an optical sheet that makes light that has passed through the light guide plate uniform light directed to the irradiation target, opposite to the side on which the irradiation target of the light guide plate is disposed And a light extraction means for reflecting the light leaked from the light guide plate or the light traveling in the light guide plate toward the irradiation target, the light guide plate is provided in a plurality of layers, and the light source is provided on the light guide plate side. Provided for each divided region that is arranged toward the light guide plate at a position along the end face and divides the illumination region to be irradiated, and the light extraction means is provided at least facing the divided region without overlapping in the stacking direction, Each divided area can be controlled individually. Comprising a degree control unit, the light guide plate, opposite the divided areas of the light guide target for guiding light from a light source, a surface opposite to the side where the irradiation target is placed, as it goes toward the center It is formed to be gradually inclined so as to approach the irradiation target, and as a light extraction means, a reflection pattern or a reflection groove is provided in a higher density at the opposite side facing the divided area that the light guide plate takes, and the light extraction is performed. In the optical path of the light guide plate leading to the means, a collimator part is formed which gradually increases in width as it is separated from the light source, and increases the degree of parallelism of the light from the light source toward the light guide target. The illumination target is a liquid crystal panel that has a liquid crystal layer and a color filter, and transmits light from the illumination device to display an image.

  ADVANTAGE OF THE INVENTION According to this invention, a display screen can be divided into arbitrary numbers and area control can be performed, and it can respond to enlargement and can implement | achieve the illuminating device which can aim at low power consumption, and a liquid crystal display device using the same .

Embodiments of the present invention will be described below with reference to the accompanying drawings.
<< First Embodiment >>
<Overall configuration of LCD TV 10>
FIG. 1A is a front view of the liquid crystal television 10 according to the first embodiment of the present invention, and FIG. 1B is an enlarged cross-sectional view taken along line AA of FIG.
As shown in FIG. 1A, the liquid crystal television 10 to which the present invention is applied has a display screen Gh for displaying an image. When displaying an image on the display screen Gh, a voltage corresponding to the image is displayed. Light emitted from the light source modules Kl (Kl1, Kl2) and Kr (Kr1, Kr2) from the rear (the back side of the paper surface in FIG. 1A) to the front (the front side of the paper surface in FIG. 1A) on the liquid crystal layer The image is displayed by irradiating the individual pixels of the color filter with light that is transmitted through and transmitting light in accordance with the image, and displaying a color corresponding to the image on each pixel.

The liquid crystal television 10 shown in FIG. 1A displays the display screen Gh in a plurality of regions r (r11, r12,... R1n, r21, r22,..., R2n, r31, r32,... R3n, r41, r42,... R4n). The image information displayed on the display screen Gh is analyzed, and area control is performed to increase or decrease the amount of light in each region r according to the brightness of each region r.
That is, the areas r (r11, r12,... R1n, r21, r22,..., R2n, r31, r32,... R3n, r41, r42,... R4n) of the divided areas of the display screen Gh are individually intensified. The light intensity control means that can be controlled is provided in the circuit section 8 (see FIG. 1B). For example, each light intensity control means of the circuit section 8 has a display screen Gh (see FIG. 1A). The region r having a low luminance of the image displayed on the screen controls or turns off the light amount of the region r, while the region r having a high luminance of the image controls the light amount of the region r.

The liquid crystal television 10 shown in FIG. 1A divides the display screen Gh into four parts in the horizontal direction (left and right direction in FIG. 1A) and n parts in the vertical direction (up and down direction in FIG. 1A). That is, a case where area control is performed by dividing 4 × n is shown.
Here, n can be increased or decreased by the number of the light source modules Kl and Kr arranged in the vertical direction (the vertical direction in the drawing of FIG. 1A) of the display screen Gh (see FIG. 1A). In the liquid crystal television 10 shown in FIG. 1A, eight light source modules Kl and Kr are arranged in the vertical direction of the display screen Gh (see FIG. 1A) (vertical direction in FIG. 1A). Therefore, n = 8, and the area control of the area r obtained by dividing the display screen Gh (see FIG. 1A) into 32 × 4 × n (8) = 32 is illustrated.
FIG. 2 is a perspective view seen obliquely from above showing a state in which the main part of the configuration for displaying an image on the display screen Gh (see FIG. 1A) is disassembled.

  As shown in FIGS. 1B and 2, the liquid crystal television 10 has a configuration in which an image is displayed on the display screen Gh, and a color is generated by a liquid crystal layer to which a voltage corresponding to the image is applied and light transmitted through the liquid crystal layer. A light-emitting diode R, G, B (see FIG. 7B) disposed on both sides and mounted on a ceramic substrate Ce and transmitted through the liquid crystal panel 1 The light source modules Kl and Kr of the left and right light sources that emit the light to be emitted (in the direction of the white arrow α0 in FIG. 1B), and the front side that takes in the light from the light source modules Kl and Kr and guides the light (FIG. 1 ( The upper layer light guide plate 2a is printed on the back side of the upper layer light guide plate 2a on the back side (the paper rear surface side in FIG. 1A) and the upper layer / lower layer light guide plates 2a, 2b. By diffusing and reflecting the light guided through the light guide plates 2a and 2b, An upper layer light scattering dot d1 and a lower layer light scattering dot d2 (see FIG. 1 (b)) such as a white printed dot pattern for guiding light forward as indicated by a white arrow α1 in FIG. 2a and 2b are disposed on the back side (the lower side of the upper and lower light guide plates 2a and 2b in FIG. 1B), respectively, and are separated from the total reflection conditions on the upper light guide plate back surface 2ar and the lower light guide plate back surface 2br. Upper layer diffuse reflection sheet 3a and lower layer diffuse reflection for diffusely reflecting the light escaping to the back side of each of the lower light guide plates 2a and 2b into light directed forward (in the direction of the white arrow α1 in FIG. 1B) Optical sheet 4 that converts light transmitted through the sheet 3b and the upper and lower light guide plates 2a and 2b into uniform light in the forward direction (in the direction of the white arrow α1 in FIG. 1B), and the upper and lower light guide plates 2a 2b, and the frame member 5 that supports the upper and lower diffuse reflection sheets 3a, 3b, etc. For example it is configured.

  Here, the light source modules Kl and Kr that are the left and right light sources, and the upper and lower light guide plates 2a and 2b that guide light from the light source modules Kl and Kr irradiate the liquid crystal panel 1 with light. This is referred to as a lighting device S.

  The lighting device S (see FIG. 1B) of the liquid crystal television 10 shown in FIG. 1A has a light source module Kl1 (Kl11,...) In front of the left side of the display screen Gh (surface direction in FIG. 1A). Kl1n) is arranged, and the light emitted from the light source module Kl1 (Kl11, Kl12,..., Kl1n) is respectively shown in the region r4 (2) using the upper light guide plate 2a as indicated by the arrow αl1 in FIG. r41, r42,..., r4n) are illuminated from the back side, and light source modules Kl2 (Kl21, Kl22,..., Kl2n) are arranged on the left back side of the display screen Gh (in the direction of the back side of the paper in FIG. The light emitted from the light source module Kl2 (Kl21, Kl22,..., Kl2n) is converted into regions r3 (r31, r32,... R3n) using the lower light guide plate 2b as indicated by the arrow αl2 in FIG. ) Is illuminated from the back side.

In the illumination device S of the liquid crystal television 10, the light source module Kr1 (Kr11, Kr12,..., Kr1n) is disposed in front of the right side of the display screen Gh, and emitted from the light source module Kr1 (Kr11, Kr12,..., Kr1n). As shown by an arrow αr1 in FIG. 1B, the upper side light guide plate 2a is used to illuminate each region r1 (r11, r12,... R1n) from the back side and to the right rear side of the display screen Gh. Is arranged with light source modules Kr2 (Kr21, Kr22,..., Kr2n), and light emitted from the light source modules Kr2 (Kr21, Kr22,..., Kr2n) is indicated by an arrow αr2 in FIG. Each region r2 (r21, r22,... R2n) is illuminated from the back side using the lower light guide plate 2b.
As shown in FIG. 1B, the side surface of the upper light guide plate 2a on which light from the light source module Kl1 on the left front side enters the upper light guide plate 2a is referred to as an incident surface Nl1, and the light source module Kl2 on the left rear side. The left side surface of the lower light guide plate 2b where the light from the light enters the lower light guide plate 2b is referred to as an incident surface Nl2.

Similarly, the side surface of the upper light guide plate 2a on which light from the right front light source module Kr1 is incident on the upper light guide plate 2a is referred to as an incident surface Nr1, and light from the right rear light source module Kr2 is applied to the lower light guide plate 2b. The right side surface of the incident lower light guide plate 2b is referred to as an incident surface Nr2.
A surface of the upper light guide plate 2a from which light is emitted from the upper light guide plate 2a toward the liquid crystal panel 1 is referred to as an emission surface D.
As shown in FIG. 1B, the liquid crystal television 10 includes a resin-made front housing case 9m in which an opening for forming the display screen Gh is formed, and the front housing case 9m that is engaged with screws. And a circuit unit 8 including a power source for comprehensively controlling the liquid crystal television 10 is provided on the rear case 9u.

The circuit unit 8 including a power source is a device that controls the liquid crystal panel 1, the light source modules Kl, Kr, and the like, and processes an image displayed on the liquid crystal television 10, for example, a CPU (Central Processing Unit) (not shown). The liquid crystal television 10 is centrally controlled by executing a program stored in the ROM, which includes a microcomputer having a RAM (Random Access Memory), a ROM (Read Only Memory), and a peripheral circuit. The
Hereafter, each structure of the principal part of the liquid crystal television 10 is demonstrated in detail.

<Upper light guide plate 2a>
3A shows the upper light guide plate 2a in the liquid crystal television 10 shown in FIG. 1A, the light source modules Kl1 (Kl11,..., Kl1n) on the near left side and the light source modules Kr1 on the near right side for supplying light thereto. 3 is a front view showing Kr11,..., Kr1n) (see FIG. 2).
The upper light guide plate 2a shown in FIG. 1 (b) and FIG. 3 (a) is, for example, a transparent molded with a resin such as an acrylic resin or a thermoplastic high-performance transparent resin such as cycloolefin polymer (Zeonor (registered trademark)). The plate-like member has a rectangular shape with a thickness dimension of, for example, 2 to 3 mm.
The cycloolefin polymer (Zeonor (registered trademark)) has high transparency and is excellent in moisture absorption resistance and heat resistance, which is resistant to humidity.

The upper light guide plate 2a is a region on both sides 1/4 of the region obtained by dividing the display screen Gh in the liquid crystal television 10 (see FIG. 1A) into four in the horizontal direction (left and right direction in FIG. 1), that is, the left side 1 / 4 regions r41, r42,..., R4n and right quarter regions r11, r12,..., R1n backlights (arrow αl1, arrow αr1 in FIG. 1B).
For this reason, the upper light guide plate 2a is divided into the left quarter area r4 (r41, r42,..., R4n) and the right quarter area r1 (4) divided in the horizontal direction of the display screen Gh shown in FIG. Upper layer light scattering dots d1 (see FIG. 1A) such as white print dot patterns are printed in the area of the back surface 2ar facing r11, r12,.

The left and right upper light scattering dots d1 on the back surface 2ar of the upper light guide plate 2a have a light intensity that travels in the upper light guide plate 2a as it goes to the center portion. As it goes on, it is provided with a higher density and is configured to be uniform in the forward direction, that is, the light intensity directed from the upper light guide plate 2a toward the liquid crystal panel 1 (see FIG. 1B).
FIG. 3B is an enlarged cross-sectional view when a conical groove portion m is provided on the back surface 2ar of the upper light guide plate 2a instead of the upper light scattering dot d1.

As shown in FIG. 3B, the upper layer light-scattering dot d1 faces forward, that is, if the light intensity directed from the upper layer light guide plate 2a toward the liquid crystal panel 1 becomes uniform, as shown in FIG. It is also possible to form the conical groove portion m on the back surface 2ar by embossing when the upper light guide plate 2a is injection molded.
The groove m formed on the back surface 2ar of the upper light guide plate 2a has a shape other than a conical shape, specifically a trapezoidal protrusion, as long as the intensity of light directed toward the liquid crystal panel 1 is uniform. It is also possible to select a semicircular protrusion or the like as appropriate.

FIG.3 (c) is CC sectional view taken on the upper-layer light-guide plate 2a shown to Fig.3 (a).
As shown in FIG. 3 (c), the upper light guide plate 2a has a left side quarter region r4 (r41, r42,..., R4n) divided into four in the horizontal direction of the display screen Gh (see FIG. 1 (a)). Is formed so that the thickness dimension s11 becomes smaller as it goes to the center, and similarly, the right quarter region r11, r12,..., R1n divided into four in the horizontal direction is formed. Opposite to the center, the thickness is gradually reduced, that is, the thickness dimension s11 is reduced. In addition, the upper light guide plate 2a is divided into a central left 1/4 region r3 (r31, r32,..., R3n) and a central right 1/4 divided into four in the horizontal direction of the display screen Gh (see FIG. 1A). The portions facing the region r2 (r21, r22,..., R2n) are formed with the same thickness dimension s12.

For example, when the thickness dimension s11 = 2 mm at the end of the upper light guide plate 2a, the thickness dimension s12 = 1 mm at the center.
In this way, the thickness of the portion facing the region r4 (r41,..., R4n) of the left side ¼ obtained by dividing the upper light guide plate 2a into four in the horizontal direction of the display screen Gh is gradually increased toward the center. The light emitted from the light source module Kl1 (Kl11,..., Kl1n) (see FIG. 1) in front of the left side (left side of the paper surface in FIG. 1A) is formed by thinly forming the thickness dimension s11 short. It is possible to suppress leakage to the center left quarter region (r31, r32,..., R3n) outside the left side quarter region r4 (r41,..., R4n).
In addition, the light emitted from the light source module Kl1 (Kl11,..., Kl1n) on the left front side is forwarded from the region r4 (r41,..., R4n) of the left side 1/4 of the upper light guide plate 2a, that is, liquid crystal. An effect of emitting light toward the panel 1 side (see FIG. 1B) is also obtained.

Similarly, the portion facing the region r1 (r11,..., R1n) of the right side ¼ obtained by dividing the upper light guide plate 2a into four in the horizontal direction of the display screen Gh gradually becomes thinner, that is, has a thickness. The light emitted from the light source module Kr1 (Kr11,..., Kr1n) (see FIG. 1) in front of the right side (right side of the paper surface in FIG. 1 (a)) is formed by shortening the dimension s1 and forming the upper light guide plate. It is possible to suppress leakage to the region r2 (r21, r22,..., R2n) of the central right side 1/4 outside the region r1 (r11,..., R1n) of the right side portion 1/4 of 2a.
In addition, the light emitted from the light source module Kr1 (Kr11,..., Kr1n) on the right front side is forward, that is, liquid crystal, from the region r1 (r11,..., R1n) of the right side ¼ of the upper light guide plate 2a. An effect of emitting light toward the panel 1 is also obtained.
In the present embodiment, the thickness of the upper light guide plate 2a is reduced toward the center in the left and right quarters of the upper light guide plate 2a. Light can be extracted selectively.

<Upper layer diffuse reflection sheet 3a>
The upper diffuse reflection sheet 3a shown in FIG. 1 (b) and FIG. 3 (c) is a reflective member that is formed by tension using a plurality of materials having different refractive indexes and has a high reflectance, for example, 99% due to the difference in refractive index. is there.
As shown in FIG. 1B, the upper-layer diffuse reflection sheet 3a has a region r4 (r41,..., R4n) of the left side quarter divided into four in the horizontal direction of the display screen Gh (see FIG. 1A). Further, they are arranged along the back surface 2ar of the upper light guide plate 2a so as to face the region r1 (r11,..., R1n) of the right side quarter.

  Here, when black printing or the like is performed on the opposite surface 3ar (see FIG. 3C) on which the upper light guide plate 2a is disposed in the upper diffuse reflection sheet 3a to form the black portion of the light shielding layer, the upper diffuse reflection sheet 3a. The light emitted from the lower light guide plate 2b disposed on the back side of the upper light guide plate 2a (the lower side in FIG. 1B) is absorbed by the black portion and emitted from the lower light guide plate 2b. The effect that the light to be reliably blocked by the upper-layer diffuse reflection sheet 3a is obtained.

<Light guide effect by upper light guide plate 2a, upper diffuse reflection sheet 3a, etc.>
FIG. 3D is a diagram showing how light emitted from the light source module Kl14 in the upper light guide plate 2a is turned on when the light source module Kl14 on the left front side is turned on.
As shown in FIG. 3 (d), the portion of the upper light guide plate 2a facing the region r44 (see FIG. 1 (a)) is intensively illuminated by the light emitted from the light source module Kl14 on the left front side, and displayed. The backlight of the region r44 of the screen Gh (see FIG. 1A) is effectively formed.

In this way, the regions r4 (r41, r42,..., R4n) in the upper light guide plate 2a are respectively emitted from the light source modules Kl1 (Kl11, Kl12,..., Kl1n) on the left front side (FIG. 1A). The portions facing each other are intensively illuminated, and the backlights of the regions r4 (r41, r42,..., R4n) of the display screen Gh (see FIG. 1A) are effectively formed.
Similarly, regions r1 (r11, r14,..., R1n) (FIG. 1) in the upper light guide plate 2a are respectively emitted from the light source modules Kr1 (Kr11, Kr12,..., Kr1n) (see FIG. 1) on the right front side. The portions facing (a) are intensively illuminated, and the backlights of the regions r1 (r11, r14,..., r1n) of the display screen Gh (see FIG. 1 (a)) are effectively formed. The

<Lower light guide plate 2b>
4A shows the lower light guide plate 2b and the light source modules Kl2 (Kl21,..., Kl2n) (see FIG. 2) and the right side of the lower light guide plate 2b for supplying light to the lower light guide plate 2b in the liquid crystal television 10 shown in FIG. FIG. 3 is a front view showing the light source module Kr2 (Kr21,..., Kr2n) (see FIG. 2).
The lower light guide plate 2b shown in FIGS. 1 (b) and 4 (a) has a region r3 on the left half of the center of the display screen Gh divided into four in the horizontal direction in the liquid crystal television 10 shown in FIG. 1 (a). (r31, r32,..., r3n), a member responsible for the backlight of the center right half region r2 (r21, r22,..., r2n).

The lower light guide plate 2b is a transparent plate-shaped member formed of a resin such as an acrylic resin or a thermoplastic high-performance transparent resin cycloolefin polymer (Zeonor (registered trademark)), and has a thickness of 2 to 3 mm, for example. It has a substantially rectangular shape with a length and a shape in which collimator portions Cl and Cr having a tapered rod structure are formed on both left and right sides.
As shown in FIG. 4A, the left collimator portions Cl (Cl 1, Cl 2,..., Cl n) of the lower light guide plate 2 b are respectively on the far left side (the paper surface and the left back side in FIG. 1A). The light source modules Kl2 (Kl21,..., Kl2n) (see FIG. 1) are formed.

  The collimator portions Cl (Cl1, Cl2,..., Cln) of the lower light guide plate 2b respectively emit light emitted from the respective light source modules Kl2 (Kl21,..., Kl2n) on the display screen Gh (see FIG. 1A). ) In the horizontal direction for the purpose of guiding light toward each region r3 (r31, r32,..., R3n) at the center left half of the region divided into four in the horizontal direction (left and right direction in FIG. 4A). ) In order to increase the degree of parallelism, the taper rod structure is formed such that the width increases as the distance from the light source modules Kl2 (Kl21,..., Kl2n) increases.

Similarly, the collimator portions Cr (Cr1, Cr2,..., Crn) on the right side of the lower light guide plate 2b are formed corresponding to the light source modules Kr2 (Kr21,..., Kr2n) on the right side.
The collimator section Cr (Cr1, Cr2,..., Crn) of the lower light guide plate 2b is configured to display the light emitted from each light source module Kl2 (Kl21,..., Kl2n) on the display screen Gh shown in FIG. In order to increase the degree of parallelism in the horizontal direction for the purpose of guiding light toward each region r3 (r31, r32,..., R3n) at the center left half of the region divided into four in the horizontal direction, the light source module The taper rod structure is formed such that the width of the light guide portion increases as the distance from Kr2 increases.

The lower light guide plate 2b is divided into four regions r3 (r31, r32,..., R3n), r2 (r21, r22,...) Divided into four in the horizontal direction of the display screen Gh shown in FIG. , R2n), lower layer light scattering dots d2 such as white print dot patterns are printed on the area of the back surface 2br facing each other as shown in FIG. 4A (see FIG. 1B).
In the left and right lower light scattering dots d2 on the back surface 2br of the lower light guide plate 2b shown in FIG. 4A, the intensity of the light traveling in the lower light guide plate 2b becomes weaker due to light loss such as reflection and heat as going to the center. For this reason, it is configured such that the density is higher as it goes to the center and the intensity of light toward the front, that is, toward the liquid crystal panel 1 becomes uniform.

If the lower layer light scattering dot d2 is provided in the left side 1/4 region r4 (r41, r42,..., R4n) slightly from the center left side region r3 (r31, r32,..., R3n), This is preferable because the boundary between r4 and region r3 can be made less clear. Similarly, when the lower layer light scattering dot d2 is provided in the right-sided region r1 (r11, r12,..., R1n) slightly from the center-right side region r2 (r21, r22,..., R2n), This is preferable because the boundary between the region r1 and the region r2 can be made less clear.
Here, the lower layer light-scattering dot d2 faces the front side, that is, if the light intensity directed from the lower layer light guide plate 2b toward the liquid crystal panel 1 becomes uniform, the lower layer light guide plate as in FIG. It is also possible to form the conical groove portion m on the back surface 2br of 2b by embossing when the lower light guide plate 2b is injection molded.

It should be noted that the groove m formed on the back surface 2br of the lower light guide plate 2b has a shape other than a conical shape and a spherical curvature as long as the intensity of light from the lower light guide plate 2b toward the liquid crystal panel 1 is uniform. It is also possible to appropriately select a shape having
FIG. 4B is a cross-sectional view of the lower light guide plate 2b shown in FIG.
As shown in FIG. 4 (b), the lower light guide plate 2b is arranged in a left side quarter region r4 (r41, r42,..., R4n) divided into four in the horizontal direction of the display screen Gh shown in FIG. The facing portion and the portion facing the right quarter region r1 (r11, r12,..., R1n) are formed to have the same thickness dimension s21. The lower light guide plate 2b is divided into a center left quarter region r3 (r31, r32,..., R3n) and a center right quarter region divided into four in the horizontal direction of the display screen Gh shown in FIG. It is shaped so that the portion facing r2 (r21, r22,..., r2n) gradually becomes thinner as it goes to the center, that is, the thickness dimension s22 becomes gradually smaller.

  In this way, the thickness dimension s21 of the left side portion facing the region r4 (r41,..., R4n) of the left side quarter that is obtained by dividing the lower light guide plate 2b into four in the horizontal direction of the display screen Gh is made the same. By doing so, the light emitted from the light source module Kl2 (Kl21,..., Kl2n) on the left back side can be transmitted through the left part to the center part with little light loss. Similarly, the lower side light guide plate 2b is made to have the same thickness dimension s21 in the right side portion facing the region of the right side 1 / 4r1 (r11,..., R1n) divided into four in the horizontal direction of the display screen Gh. Thus, the light emitted from the light source module Kr2 (Kr21,..., Kr2n) on the right back side can be transmitted through the right side portion to the central portion with little light loss.

Then, the portion facing the region r3 (r31, r32,..., R3n) of the central left quarter obtained by dividing the lower light guide plate 2b into four in the horizontal direction of the display screen Gh shown in FIG. The light source module Kl2 (Kl21, Kl21, Kl21, Kl2) is formed in a region r3 (r31, r32,..., R3n) at the center left quarter of the lower light guide plate 2b. ..., Kl2n) leaks into the central right quarter region r2 (r21, r22,..., R2n) outside the central left quarter region r3 (r31, r32,..., R3n). This can be suppressed.
In addition, the light emitted from the light source module Kl2 (Kl21,..., K21n) on the back left side is converted into a region r3 (r31, r32,..., R3n) at the center left quarter of the lower light guide plate 2b (FIG. 1 ( It is also possible to obtain an effect of emitting light forward from a position facing (see a)) toward the front, that is, toward the liquid crystal panel 1 (in the direction of the white arrow α1 in FIG. 1B).

Similarly, as shown in FIG. 4 (b), the lower right light guide plate 2b is divided into four regions r2 (r21, r22,...) Of the center right side obtained by dividing the lower light guide plate 2b into four in the horizontal direction of the display screen Gh shown in FIG. , R2n) is gradually thinned as it goes to the center, and the thickness dimension s22 is shortened to form a region (r21, r22,..., R2n) on the center right quarter of the lower light guide plate 2b. The light emitted from the light source module Kr2 (Kr21,..., Kr2n) on the right back side is a region r3 (r31, r31, r4) at the center left side outside the region (r21, r22,..., R2n) at the center right side. It is possible to suppress leakage to r32,..., r3n) (see FIG. 1B).
In addition, the light emitted from the light source module Kr2 (Kr21,..., Kr2n) on the right rear side is converted into a region (r21, r22,..., R2n) at the center right side of the lower light guide plate 2b (r21, r22,. It is also possible to obtain an effect of emitting light forward from the portion facing (see)) toward the liquid crystal panel 1 side.
In the present embodiment, in the central half region of the lower light guide plate 2b, the thickness of the lower light guide plate 2b is reduced toward the center. However, even in a uniform thickness, it is almost selected. Light can be extracted.

<Details of the vicinity of the collimator portions Cl and Cr of the lower light guide plate 2b>
FIG. 5A is an enlarged view of the vicinity of the left collimator section Cl (Cl1, Cl2,..., Cln) and the light source module Kl2 (Kl21,..., Kl2n) on the left back side of the lower light guide plate 2b. 5 (b) is an enlarged view showing a state in which the light emitted from the light source module Kl23 on the back left side is collimated in the collimator portion Cl3 shown in FIG. 5 (a).
As shown in FIG. 5A, the light source modules Kl2 (Kl21, Kl22,..., Kl2n) on the back left side corresponding to the collimator parts Cl (Cl1, Cl2,..., Cln) on the left side of the lower light guide plate 2b. The length dimension sl2 of the lower-layer LED (Light Emitting Diode) mounted on each is the length dimension s42 of the incident surface Nl2 of the left collimator portion Cl (Cl1, Cl2,..., Cln) (see FIG. 5B). ) (Details will be described later).

  As shown in FIG. 5B, the extending direction of the collimator portion Cl of the left collimator portion Cl (Cl1, Cl2,..., Cln) in the lower light guide plate 2b (indicated by a two-dot chain line in FIG. 5B). ) With respect to the extending direction of the collimator portion Cl (indicated by a two-dot chain line in FIG. 5B) and traveling at an angle φ. β1 is incident on the opposite inclined surface Clm2 at an angle (φ−θ), reflected by the inclined surface Clm2, and with respect to the extending direction of the collimator portion Cl (indicated by a two-dot chain line in FIG. 5B). The light β2 traveling at an angle (φ−2θ). The light β2 is incident on the inclined surface Clm1 at an angle (φ-3θ), reflected by the inclined surface Clm1, and with respect to the extending direction of the collimator portion Cl (indicated by a two-dot chain line in FIG. 5B). It becomes light β3 traveling at an angle (φ-4θ). The light β3 is incident on the inclined surface Clm2 at an angle (φ-5θ), reflected by the inclined surface Clm2, and with respect to the extending direction of the collimator portion Cl (indicated by a two-dot chain line in FIG. 5B). It becomes light β4 traveling at an angle (φ-6θ). The light β4 is incident on the inclined surface Clm1 at an angle (φ-7θ), reflected by the inclined surface Clm1, and with respect to the extending direction of the collimator portion Cl (indicated by a two-dot chain line in FIG. 5B). Light β5 traveling at an angle (φ−8θ) is inclined, the degree of parallelism is increased toward the center, and the light enters the region facing the region r33 of the display screen Gh (see FIG. 1A). .

  That is, light incident with an inclination of φ with respect to the extending direction of the collimator portion Cl (indicated by a two-dot chain line in FIG. 5B) is reflected K times (K) by the inclined surfaces Clm1 and Clm2 of the collimator portion Cl. : Natural number excluding 0), the parallelism increases by 2Kθ with respect to the inclination angle θ of the inclined surfaces Clm1 and Clm2 with respect to the extending direction (indicated by a two-dot chain line in FIG. 5B). It is done. That is, light incident at an angle φ with respect to the extending direction of the collimator portion Cl (indicated by a two-dot chain line in FIG. 5B) is reflected K times to repeat the extending direction. Thus, the light travels at an inclination angle of (φ−2Kθ), and the degree of parallelism is increased.

In this way, the light emitted from the light source module Kl2 (Kl21, Kl22,..., Kl2n) on the back left side is incident on the left collimator portion Cl (Cl1, Cl2,..., Cln) of the lower light guide plate 2b. In the process of entering from the surface Nl2 and passing through the collimator portion Cl (Cl1, Cl2,..., Cln) toward the center, the extending direction of the collimator portion Cl (indicated by a two-dot chain line in FIG. 5B) That is, the degree of parallelism with respect to the center side is increased, and the light enters the regions r31 to r3n of the display screen Gh (see FIG. 1A).
Similarly, the light emitted from the light source module Kr2 (Kr21, Kr22,..., Kr2n) on the right back side shown in FIG. 4A is respectively collimated on the right side of the lower light guide plate 2b (Cr1, Cr2,...). , Crn) from the incident surface Nr2 and passing through the collimator portion Cr (Cr1, Cr2,..., Crn) toward the center side, the parallelism toward the extending direction of the collimator portion Cl, that is, toward the center side. And is incident on the region r2 (r21 to r2n) of the display screen Gh (see FIG. 1A).

Here, as shown in FIG. 5B, the respective lengths of the incident surfaces Nl2 (Nl21, Nl22,..., N2n) of the left collimator portion Cl (Cl1, Cl2,..., Cln) in the lower light guide plate 2b. The larger the dimension s43 in the extending direction of the collimator portion with respect to the dimension s42, the larger the distance for parallelization toward the regions r31 to r3n that are light guide regions (corresponding to the dimension s43 in the extending direction of the collimator portion Cl). ) Can be shortened,
The higher the ratio of (dimension s43 in the extending direction of the collimator portion) / (length dimension s42 of the incident surface Nl2), that is, the larger θ is, the better.

For example, the inclination angle θ (see FIG. 5B) of the collimator portions Cl and Cr in the lower light guide plate 2b shown in FIG. 4A is 10 degrees, and the dimension s43 in the extending direction of the collimator portions Cl and Cr is 10 cm. In some cases, the dimension s43 in the extending direction of the collimator portions Cl and Cr can be set to 5 cm by setting θ to 20 degrees. Further, if the inclination angle θ of the collimator portions Cl and Cr in the lower light guide plate 2b is increased 10 times, the dimension s43 in the extending direction of the collimator portions Cl and Cr can be reduced to 1/10.
In addition, the LED of each light source module Kl2 (Kl21,..., Kl2n) on the back left side and the LED of each light source module Kr2 (Kr21,..., Kr2n) on the back right side use one high-intensity power LED. Is desirable. This is because the length dimension s42 (see FIG. 5B) of the incident surfaces Nl2 and Nr2 shown in FIG. 4A can be shortened, so that θ can be increased, and the dimension s43 in the extending direction of the collimator portion Cl (FIG. 4). 5 (b)) can be shortened.

Thus, by using one high-intensity LED for each light source module Kl2 (Kl21,..., Kl2n) and each light source module Kr2 (Kr21,..., Kr2n), each collimator section Cl (Cl1, Cl2,. , Cln) can reduce the respective length dimension s42 (see FIG. 5B) of the incident surface Nl2, and each of the incident surfaces Nl2 of the right collimator portions Cr (Cr1, Cr2,..., Crn). The length dimension s42 can be shortened.
Therefore, the distances for collimating the light emitted from the light source modules Kl2 and Kr2 toward the target regions r3 and r2 (dimensions s43 in the extending direction of the collimator portions Cl and Cr (see FIG. 5B)). The dimension s43 in the extending direction of the collimator portions Cl and Cr can be shortened, respectively.

The left collimator portion Cl and the right collimator portion Cr in the lower light guide plate 2b are formed integrally with the lower light guide plate body portion 2b1.
Alternatively, if the lower light guide plate body 2b1, the left collimator portion Cl, and the right collimator portion Cr are made of the same or substantially the same refractive index of the transparent resin material, the lower light guide plate body 2b1 and the left collimator portion The part Cl and the right collimator part Cr are manufactured separately, and the lower light guide plate main body 2b1, the left collimator part Cl and the right collimator part Cr are joined with a transparent acrylic double-sided tape ( In FIG. 5, the joining line is indicated by a two-dot chain line), or a lower resin plate body 2b1 and the collimator parts Cl and Cr may be optically adhered by using a transparent resin adhesive.

<Lower layer diffuse reflection sheet 3b>
The lower diffuse reflection sheet 3b shown in FIG. 1B and FIG. 2 is a reflecting member that is formed by tension using a plurality of materials having different refractive indexes and has a high reflectance, for example, 99% due to a difference in refractive index.
The lower layer diffuse reflection sheet 3b is disposed along the back surface 2br of the lower layer light guide plate 2b as shown in FIGS.

<Lighting of region r of display screen Gh of lower layer light guide plate 2b>
FIG. 4C shows the light source module Kl25 in the lower light guide plate 2b viewed from the front side (the paper surface and the surface side of FIG. 1A) when the light source module Kl25 on the back left side is turned on. It is the figure which showed the light transmission condition.
As shown in FIG. 4 (c), the light emitted from the light source module Kl25 on the back left side is guided by the collimator unit Cl and faces the region r35 (see FIG. 1 (a)) in the lower light guide plate 2b. It is understood that the backlight of the region r35 of the display screen Gh (see FIG. 1A) is effectively formed. Since the collimator portion Cl is shielded from light by the upper-layer diffuse reflection sheet 3a shown in FIGS. 1B and 2, the light is guided from the front side (the paper surface and the front side in FIG. 1A) by the collimator portion Cl. Will not be visible.

In this way, the regions r4 (r31, r34,..., R3n) in the lower light guide plate 2b are respectively emitted by the light emitted from the light source modules Kl2 (Kl21, Kl22,..., Kl2n) on the left back side (FIG. 1 (a )) Is intensively illuminated, and the backlights of the regions r3 (r31, r34,..., R3n) of the display screen Gh (see FIG. 1A) are effectively formed.
Similarly, regions r2 (r21, r22,..., R2n) in the lower light guide plate 2b are respectively emitted from the light source modules Kr2 (Kr21, Kr22,..., Kr2n) (see FIG. 1) on the right back side (see FIG. 1). 1 (a)) are intensively illuminated, and the backlights of the regions r2 (r21, r22,..., R2n) of the display screen Gh (see FIG. 1 (a)) are effectively formed. Is done.

<Positional relationship between upper light guide plate 2a and lower light guide plate 2b>
FIG. 6 is a diagram showing the positional relationship between the upper light guide plate 2a and the lower light guide plate 2b in the cross section along the line AA in FIG.
Corresponding to the region r1 (r11 to r1n), region r2 (r21 to r2n), region r3 (r31 to r3n), region r4 (r41 to r4n) of the display screen Gh shown in FIG. As shown, the upper light guide plate 2a and the lower light guide plate 2b are arranged so as to overlap each other.

<Light source modules Kr1, Kr2, Kl1, Kl2>
Next, the configuration of the light source modules Kr and Kl will be described.
As shown in FIG. 1B, the light of the light source module Kl1 (Kl11, Kl12,..., Kl1n) on the left side of the front (see FIGS. 3A and 2) is converted into the white arrow α0 in FIG. As shown in FIG. 2, the light is incident on the upper light guide plate 2a from the incident surface Nl1 (see FIG. 3A) of the upper light guide plate 2a, and the region r4 (r41, r42) of the display screen Gh (see FIG. 1A). ,..., R4n) are illuminated from the back side as indicated by an arrow αl1 in FIG. 1B to form a backlight (see FIG. 1A) of the region r4 (r41, r42,..., R4n). To do.

  Similarly, as shown in FIG. 1 (b), the light from the right light source module Kr1 (Kr11, Kr12,..., Kr1n) (see FIGS. 3 (a) and 2) is converted into the white light in FIG. 1 (b). As indicated by the extraction arrow α0, the light enters the upper light guide plate 2a from the incident surface Nr1 (see FIG. 3A) of the upper light guide plate 2a, and the region r1 (see FIG. 1A) of the display screen Gh. r11, r12,..., r1n) are illuminated from the back side as indicated by an arrow αr1 in FIG. 1B, and the backlight of the region r1 (r11, r12,..., r1n) (see FIG. 1A). ).

Further, as shown in FIG. 1B, the light of the light source module Kl2 (Kl21, Kl22,..., Kl2n) on the far left side (see FIGS. 4A and 2) is outlined in FIG. As indicated by the arrow α0, the light enters the lower light guide plate 2b from the incident surface Nl2 of the lower light guide plate 2b, and enters the region r3 (r31, r32,..., R3n) of the display screen Gh (see FIG. 1A). As shown by an arrow αl2 in FIG. 1 (b), illumination is performed from the back side to form a backlight (see FIG. 1 (a)) of a region r3 (r31, r32,..., R3n).
In addition, as shown in FIG. 1B, the light from the right light source module Kr2 (Kr21, Kr22,..., Kr2n) (see FIGS. 4A and 2) is outlined in FIG. As indicated by an arrow α 0, the light is incident on the lower light guide plate 2 b from the incident surface Nr 2 of the lower light guide plate 2 b, and the region r 2 (r 21, r 22,..., R 2 n) of the display screen Gh (see FIG. 1A) is displayed. As shown by an arrow αr2 in FIG. 1B, illumination is performed from the back side to form a backlight (see FIG. 1A) of the region r2 (r21, r22,..., R2n).

7 (a) is an enlarged view of the light source modules Kl1 and Kl2 on the left side of FIG. 1 (a) as viewed in the direction of the arrow B, and FIG. 7 (b) is an enlarged view of part E of FIG. 7 (a). FIG. 7C is an enlarged cross-sectional view taken along line FF in FIG.
As shown in FIG. 7A, the length dimension sl2 of each light source module Kl2 (Kl21, Kl22,..., Kl2n) on the left back side that supplies light to the lower light guide plate 2b is opposed to the figure. 4 (a), collimator portions Cl (Cl1, Cl2,..., Cln) are formed on the lower light guide plate 2b, and the length dimension s42 of each incident surface Nl2 of the left collimator portion Cl of the lower light guide plate 2b. (See FIG. 5B) is formed shorter than the corresponding portion of the incident surface Nl1 of the upper light guide plate 2a shown in FIG. 3A, so that each light source on the left front side that supplies light to the upper light guide plate 2a It is formed shorter than the length dimension sl1 of the module Kl1 (Kl11, Kl12,..., Kl1n) (see FIG. 5A).
Thereby, it is suppressed that the light emitted from the light source module Kl2 on the left back side is lost.

For example, as shown in FIG. 7A, the light source module Kl26 on the left back side is formed shorter than the light source module Kl16 on the left front side, and the light source module Kl25 on the left back side is formed shorter than the light source module Kl15 on the left front side. Has been.
Similarly, the length dimension of each light source module Kr2 (Kr21, Kr22,..., Kr2n) on the right back side that supplies light to the lower light guide plate 2b is opposite to this as shown in FIG. The collimator portion Cr (Cr1, Cr2,..., Crn) is formed on the lower light guide plate 2b, and the length dimension of each incident surface Nr2 (see FIG. 5B) of the collimator portion Cr on the right side of the lower light guide plate 2b. , Each light source module Kr1 (Kr11, Kr12,..., Kr1n on the right front side for supplying light to the upper light guide plate 2a is formed shorter than the corresponding portion of the incident surface Nr1 of the upper light guide plate 2a shown in FIG. ).
Thereby, it is suppressed that the light emitted from the light source module Kr2 on the right back side is lost.

  Each of these light source modules Kr1 (Kr11, Kr12, ..., Kr1n), Kl1 (Kl11, Kl12, ..., Kl1n), Kr2 (Kr21, Kr22, ..., Kr2n), Kl2 (Kl21, Kl22, ..., Kl2n) As shown in FIG. 7B, 10 to 20 combinations of green light emitting diodes G, red light emitting diodes R, and blue light emitting diodes B of the three primary colors are mounted on the ceramic substrate Ce. Covering the diode G, the red light emitting diode R, and the blue light emitting diode B, as shown in FIGS. 7B and 7C, for example, a semi-cylindrical shape using a transparent silicone resin having high heat resistance A transparent lens le is formed.

As shown in FIG. 7C, the semi-cylindrical lens le emits light to the side in the green light emitting diode G, the red light emitting diode R, and the blue light emitting diode B (FIG. 7C). ) (In the direction of arrow γ11), the slant reflection part le1 that reflects the light in the direction of arrow γ11 toward the upper light guide plate 2a or the lower light guide plate 2b is provided with the green light emitting diode G, the red light emitting diode R, and the blue light. The light emitting diodes B are formed adjacent to each other.
In addition, as shown in FIG.7 (c), the cross section of the inclination reflection part le1, ie, the cross section of a transversal direction, exhibits a triangular shape.

The inclined reflecting portion le1 is formed by forming an inclined projection portion Ce1 that becomes a male shape of the inclined reflecting portion le1 after thermosetting at the green sheet stage before thermosetting the ceramic substrate Ce, and thermosetting the green sheet. A green light-emitting diode G, a red light-emitting diode R, and a blue light-emitting diode B are mounted on a ceramic substrate Ce having a plurality of inclined protrusions Ce1 after thermosetting with the inclined protrusions Ce1 interposed therebetween, and then transparent. By forming a semi-cylindrical lens le using a simple silicone-based resin, a plurality of inclined reflection portions le1 are formed on the lens le.
As a result, as shown in FIG. 7C, the light emitted from the green light emitting diode G, the red light emitting diode R, and the blue light emitting diode B to the side (in the direction of arrow γ11 in FIG. 7C) is converted into the lens. The light is reflected by the inclined reflecting portion le1 of le and is directed toward the upper light guide plate 2a or the lower light guide plate 2b to be emitted (in the direction of arrow γ12 in FIG. 7C).

Therefore, by forming the inclined reflection part le1 on the lens le, the loss of light emitted from the light source modules Kr1, Kr2, Kl1, and Kl2 is suppressed, and the light utilization efficiency can be improved.
In addition, although the shape of the inclined reflection part le1 of the lens le is exemplified by the cross section, that is, the cross section in the short side direction is triangular, the shape can reflect light toward the upper light guide plate 2a or the lower light guide plate 2b to be emitted. If so, the shape of the inclined reflecting portion le1 such as a shape having a semicircular curvature is not limited to a triangular cross section in the short direction.
The left light source modules Kl1 and Kl2 have been described above as examples, but the right light source modules Kr1 and Kr2 have the same configuration.

Each of these light source modules Kr1 (Kr11, Kr12, ..., Kr1n), Kl1 (Kl11, Kl12, ..., Kl1n), Kr2 (Kr21, Kr22, ..., Kr2n), Kl2 (Kl21, Kl22, ..., Kl2n) Brightness control for each region r (r11, r12,..., R4n) of the display screen Gh (see FIG. 1A) and emphasizing any of red, blue, and green light emitting diodes R, B, and G The circuit portion 8 shown in FIG. 1B analyzes the video displayed on the display screen Gh for each region r, and performs independent area control. Has been done.
Here, the brightness of the light of the light source modules Kr1, Kr2, Kl1, and Kl2 is controlled by the level of current applied to the red, blue, and green light emitting diodes R, B, and G.
If white light emitting diodes are used for the light source modules Kr1 and Kl1 of the light source that supplies light to the light guide plate 2a closest to the liquid crystal panel 1 to be irradiated, red, blue, and green light emitting diodes R, B, and G are provided. Since the distance for mixing red, blue, and green into white light when used is unnecessary, it is more preferable.
Further, the light source modules Kr1, Kr2, Kl1, and Kl2 employ a method in which the light emitting diodes R, B, and G are mounted on the ceramic substrate Ce and are coated with a semi-cylindrical lens le using a transparent silicone resin. However, other mounting forms may be used as long as the light extraction efficiency is high. For example, a package in which a light emitting diode is mounted on a lead frame electrode and sealed with a white resin is arranged on a resin substrate. Also good.

The light source modules Kl1, Kl2, Kr1, and Kr2 may use fluorescent tubes instead of the light emitting diodes. The fluorescent tube is used for each of the light source modules Kl1, Kl2, Kr1, and Kr2, but may be an arbitrary number corresponding to the number of light source modules. That is, as for the number of fluorescent tubes, a single fluorescent lamp or a plurality of arbitrary fluorescent tubes can be arranged as left and right light sources.
Thus, the light source modules Kl1, Kl2, Kr1, and Kr2 that are light sources are not limited to light emitting diodes as long as they emit light.

<Effect>
According to the above configuration, by arranging an arbitrary number of light guide plates, the display screen Gh (see FIG. 1 (a)) is set in the horizontal direction (left and right direction in FIG. 1 (a)). The number of light source modules is arranged in the vertical direction (up and down direction on the paper surface of FIG. 1A), and the display screen Gh (see FIG. 1A) is displayed in the vertical direction (see FIG. 1A). Area control can be performed by dividing the number of light source modules in the vertical direction of the drawing in FIG.

Here, when the display screen Gh (see FIG. 1A) is enlarged, since the area of the display screen Gh is large, it is necessary to divide the display screen Gh into a number of areas. For example, by increasing the number of light guide plates arranged in an overlapping manner and increasing the number of light sources, the number of regions for dividing the display screen Gh can be increased, which is suitable for increasing the size of the display screen Gh.
Accordingly, area control can be performed in which the display screen Gh of the liquid crystal television shown in FIG. 1A is divided into an arbitrary number of areas, and power consumption can be reduced by this area control.

<< Second Embodiment >>
Next, a second embodiment will be described with reference to FIGS.
<Outline of Liquid Crystal Television 20 of Second Embodiment>
FIG. 8A is a front view of the liquid crystal television 20 according to the second embodiment of the present invention, and FIG. 8B is an enlarged sectional view taken along the line GG of FIG. 8A.

  As shown in FIG. 8 (b), the liquid crystal television 20 of the second embodiment has an upper light guide plate in which three light guide plates of an upper light guide plate 22a, a middle light guide plate 22b, and a lower light guide plate 22c are stacked. Eight light source modules Kl1 (Kl11,... Kl18) on the front left side for supplying light to 22a, Eight light source modules Kr1 (Kr11,... Kr18) on the front right side, and the middle left side for supplying light to the middle-layer light guide plate 22b Eight light source modules Kl2 (Kl21,... Kl28), eight light source modules Kr2 (Kr21,... Kr28) on the middle right side, and eight light source modules Kl3 (Kl31,... On the far left side for supplying light to the lower light guide plate 22c. Kl38), eight light source modules Kr3 (Kr31,... Kr38) on the right side are provided.

As a result, the display screen Gh shown in FIG. 8A is divided into six in the horizontal direction (left and right direction in FIG. 8A) by three light guide plates, and left and right of each light guide plate 22a, 22b, 22c. By providing eight light source modules in the vertical direction, each is divided into eight, and 48 regions r (r11,... R18, r21,... R28, r31,... R38, r41,... R48, r51,... R58, r61,. This is a configuration that enables area control of r68).
It should be noted that the areas r (r11,... R18, r21,... R28, r31,... R38, r41,... R48, r51,... R58, r61,... R68), which are the divided areas of the display screen Gh of the liquid crystal television 20, The light intensity control means capable of individually controlling the light intensity is provided in the circuit unit 28 (see FIG. 8B) to perform area control.

<Upper light guide plate 22a>
The upper light guide plate 22a is a region r6 (r61, r62,..., R68 on the left side 1/6 of both sides 1/6 of the region obtained by dividing the display screen Gh in the liquid crystal television 20 shown in FIG. ) Backlight (see arrow αl1 in FIG. 8 (b)) and the backlight (see arrow αr1 in FIG. 8 (b)) of the region 1/6 on the right side (see r11, r12,..., R18). It is.
FIG. 9A is a front view of the upper light guide plate 22a and the light source modules Kl1 (Kl11,... Kl18), Kr1 (Kr11,... Kr18) on the near side, and FIG. It is a HH sectional view taken on the line.

As shown in FIG. 9 (a), a taper that gradually increases in width as it moves away from the light source module Kl1 at a position facing the light source module Kl1 (Kl11,... Kl18) on the front left side that supplies light to the upper light guide plate 22a. The rod-shaped collimator portion Cl1 is formed, and the width gradually increases as the distance from the light source module Kr1 increases in the position facing the right front light source module Kr1 (Kr11,... Kr18) that supplies light to the upper light guide plate 22a. A collimator portion Cr1 having a tapered rod structure is formed.
As shown in FIG. 9 (b), the upper light guide plate 22a is divided into a left sixth region r6 (r61, r62,..., R68) divided into six in the horizontal direction of the display screen Gh shown in FIG. 8 (a). The opposing part is formed so as to gradually become thinner as it goes to the central part, and as it goes to the central part facing the right-side 1/6 region r1 (r11, r12,..., R18) divided into six in the horizontal direction. It is shaped to become thinner gradually.

The upper light guide plate 22a includes a left middle region r5 (r51, r52,..., R58) divided into six in the horizontal direction of the display screen Gh shown in FIG. r48), the region r3 (r31, r32,..., r38) on the center right side 1/6 and the region r2 (r21, r22,..., r28) on the right middle side have the same thickness. It is molded to the size.
Further, the upper light guide plate 22a shown in FIG. 9 has a left side 1/6 region r6 (r61, r62,..., R68) divided into six in the horizontal direction of the display screen Gh (see FIG. 8A) and a right side 1 /. Upper layer light scattering dots d21 such as a white print dot pattern are printed in the region of the back surface 22ar facing the six regions r1 (r11, r12,..., R18).

As the left and right upper layer light scattering dots d21 on the back surface 22ar of the upper layer light guide plate 22a go to the center, the intensity of light traveling in the upper layer light guide plate 22a is weakened by light loss such as reflection and heat. It is provided at a high density and is configured to be uniform in the forward direction, that is, the intensity of light from the upper light guide plate 22a toward the liquid crystal panel 21.
The upper layer light scattering dot d21 may be substituted for the groove m shown in FIG.

<Upper Diffuse Reflective Sheet 23a>
As shown in FIGS. 8B and 9B, the left side 1/6 region r6 (r61, r62,..., R68) divided into six in the horizontal direction of the display screen Gh (see FIG. 8A) and An upper diffuse reflection sheet 23a having a high reflectivity, for example, a reflectivity of 99%, is disposed along the region of the back surface 22ar facing the right-side region 1/6 (r11, r12,..., R18).
In addition, when black printing etc. are performed and the black part of a light shielding layer is formed in the back surface 23ar on the opposite side to which the upper layer light guide plate 22a is arrange | positioned, the light radiate | emitted from the middle layer light guide plate 22b and the lower layer light guide plate 22c Can be reliably blocked by the upper-layer diffuse reflection sheet 23a.

<Middle-layer light guide plate 22b>
The middle-layer light guide plate 22b has a backlight (FIG. 8 (b)) of the region r5 (r51, r52,..., R58) in the left middle 1/6 of the region obtained by dividing the display screen Gh shown in FIG. ) And the backlight (see arrow αr2 in FIG. 8B) of the region r2 (r21, r22,..., R28) in the right middle portion 1/6.
10 (a) is a front view of the middle-layer light guide plate 22b and the middle light source modules Kl2 (Kl21,... Kl28), Kr2 (Kr21,... Kr28), and FIG. 10 (b) is a diagram of FIG. It is the II sectional view taken on the line.

As shown in FIG. 10B, the light source module Kl2 (Kl21,... Kl28) that supplies light to the middle-layer light guide plate 22b is separated from the light source module Kl2, as shown in FIG. Accordingly, a collimator portion Cl2 having a tapered rod structure whose width is gradually increased is formed.
In addition, a collimator portion Cr2 having a tapered rod structure that gradually increases in width as it is separated from the light source module Kr2 is formed at a location facing the light source module Kr2 (Kr21,... Kr28) that supplies light to the middle-layer light guide plate 22b. .

  As shown in FIG. 10 (b), the middle-layer light guide plate 22b is divided into a left-side 1/6 region r6 (r61, r62,..., R68) divided into six in the horizontal direction of the display screen Gh shown in FIG. The opposite portion and the portion facing the right 1/6 region r1 (r11, r12,..., R18) divided into six in the horizontal direction are formed with the same thickness, and the left middle side 1 divided into six in the horizontal direction 1 The portion facing the / 6 region r5 (r51, r52,..., R58) and the portion facing the right middle １ ／ region r2 (r21, r22,..., R28) gradually become thinner toward the center. In addition, the display screen Gh is divided into 6 parts in the horizontal direction and the area on the left side 1/6 of the central left side r4 (r41, r42,..., R48) and the central right side 1 divided into 6 parts in the horizontal direction. The portions facing the / 6 region r3 (r31, r32,..., R38) are formed to have the same thickness.

Further, the middle-layer light guide plate 22b shown in FIG. 10 faces the left middle 1/6 region r5 (r51, r52,..., R58) divided into six in the horizontal direction of the display screen Gh shown in FIG. Middle layer light scattering dots d22 such as a white print dot pattern are printed on the region of the back surface 22br facing the region of the back surface 22br and the region r2 (r21, r22,..., R28) on the right middle side 1/6.
The left and right middle layer light scattering dots d22 on the back surface 22br of the middle layer light guide plate 22b go to the center because the intensity of light traveling in the middle layer light guide plate 22b decreases due to light loss such as reflection and heat as it goes to the center. Accordingly, the light intensity is uniform and the light intensity toward the liquid crystal panel 21 from the middle light guide plate 22b is uniform.

  It should be noted that the middle layer light scattering dot d22 in the region of the back surface 22br of the middle layer light guide plate 22b facing the region r5 (r51, r52,..., R58) on the left middle side 1/6 of the display screen Gh (see FIG. 8A). Is slightly provided also in the area of the back surface 22br facing the left-side 1/6 area r6 (r61, r62,..., R68), so that the left middle 1/6 of the display screen Gh (see FIG. 8 (a)). This is preferable because the boundary between the region r5 and the left side 1/6 region r6 can be less clearly understood.

Similarly, the middle layer light scattering dots in the region of the back surface 22br of the middle layer light guide plate 22b facing the region r2 (r21, r22,..., R28) on the right middle side 1/6 of the display screen Gh (see FIG. 8A). d22 is slightly provided also in the region of the back surface 22br facing the region 1 (r11, r12,..., r18) on the right side 1/6, so that the right middle 1 / of the display screen Gh (see FIG. 8A) is provided. This is preferable because the boundary between the 6 region r2 and the right 1/6 region r1 can be made less clear.
The middle layer light scattering dot d22 may be a groove m shown in FIG.

<Medium Diffuse Reflective Sheet 23b>
Then, as shown in FIGS. 8B and 10B, the left side 1/6 region r6 (r61, r62,..., R68 divided into six in the horizontal direction of the display screen Gh (see FIG. 8A). ) And a middle layer diffuse reflection sheet 23b having a high reflectivity, for example, 99%, is disposed along the region of the back surface 22ar facing the region r5 (r51, r52,..., R58) of the left middle side 1/6. Yes. Similarly, along the region of the rear surface 22ar facing the right side 1/6 region r1 (r11, r12,..., R18) and the right middle side 1/6 region r2 (r21, r22,..., R28), An intermediate-layer diffuse reflection sheet 23b having a reflectance, for example, a reflectance of 99% is provided.
In addition, when the black portion of the light shielding layer is formed by performing black printing or the like on the back surface 23br on the opposite side where the middle layer light guide plate 22b is arranged in each middle layer diffuse reflection sheet 23b, the light emitted from the lower layer light guide plate 22c is diffused into the middle layer. The effect that it can interrupt | block reliably with the reflection sheet 23b is acquired.

<Lower light guide plate 22c>
The lower light guide plate 22c is a backlight (r41, r42,..., R48) of the center left 1/6 of the region obtained by dividing the display screen Gh in the liquid crystal television 20 shown in FIG. This is a member responsible for the backlight (see arrow αr3 in FIG. 8B) of the region r3 (r31, r32,..., R38) in the center right 1/6) (see arrow αl3 in FIG. 8B).
FIG. 11A is a front view of the lower light guide plate 22c and the light source modules Kl3 (Kl31,... Kl38) and Kr3 (Kr31,... Kr38) on the left back side, and FIG. It is a JJ line sectional view of).

  As shown in FIG. 8B, the light source module Kl3 (Kl31,... Kl38) that supplies light to the lower light guide plate 22c is separated from the light source module Kl3 as shown in FIG. As the distance from the light source module Kr3 increases, the collimator portion Cl3 having a tapered rod structure that gradually increases in width is formed, and the light source module Kr3 (Kr31,... Kr38) that supplies light to the lower light guide plate 22c is gradually formed. A collimator portion Cr3 having a taper rod structure with an increased width is formed.

  As shown in FIG. 11 (b), the lower-layer light guide plate 22c is formed in a left side 1/6 region r6 (r61, r62,..., R68) divided into six in the horizontal direction of the display screen Gh shown in FIG. The opposite location and the location facing the left middle 1/6 region r5 (r51, r52,..., R58) are formed with the same thickness, and the right 1/6 region r1 (6 divided horizontally) r11, r12,..., and r18) and the right middle 1/6 region r2 (r21, r22,..., r28) are formed in the same thickness, and the center left 1/6. As the position facing the area r4 (r41, r42,..., R48) and the area r3 (r31, r32,. Molded to be thin.

  Further, the lower light guide plate 22c shown in FIG. 11 is a back surface facing the center left 1/6 region r4 (r41, r42,..., R48) divided into six in the horizontal direction of the display screen Gh shown in FIG. A lower layer light scattering dot d23 such as a white print dot pattern is printed on the 22cr area and the back 22cr area opposite to the center right 1/6 area r3 (r31, r32,..., R38) divided into 6 in the horizontal direction. Has been.

As the lower layer light scattering dot d23 on the back surface 22cr of the lower layer light guide plate 22c goes to the center, the intensity of light traveling in the lower layer light guide plate 22c is weakened by light loss such as reflection, heat, etc. It is provided with a high density and is configured to be uniform in the forward direction, that is, the intensity of light directed from the lower light guide plate 22c toward the liquid crystal panel 21.
It should be noted that the middle layer light scattering dot d22 in the region of the back surface 22br of the middle layer light guide plate 22b facing the region r4 (r41, r42,..., R48) on the center left side 1/6 of the display screen Gh (see FIG. 8A) , The center left side 1/6 of the display screen Gh (see FIG. 8A) is also provided slightly in the region of the back surface 22br facing the region r5 (r51, r52,..., R58) of the left middle side 1/6. This is preferable because the boundary between the region r4 and the region 1/5 on the left middle side can be made less clear.

Similarly, the middle layer light scattering dot d22 in the region of the back surface 22br of the middle layer light guide plate 22b facing the region r3 (r31, r32,..., R38) on the center right side 1/6 of the display screen Gh (see FIG. 8A). Is slightly provided also in the region of the back surface 22br facing the region r2 (r21, r22,..., R28) on the right middle side 1/6, so that the center right side 1 / of the display screen Gh (see FIG. 8A) is provided. This is preferable because the boundary between the region 6 of the region 6 and the region 6 of the right middle １ ／ can be less clearly understood.
The lower layer light scattering dot d23 may be a groove m shown in FIG.

<Lower layer diffuse reflection sheet 23c>
8B and 11B, a lower diffuse reflection sheet 23c having a high reflectance, for example, a reflectance of 99%, is disposed along the back surface 22cr of the lower light guide plate 22c. .
Since the configuration other than this is the same as that of the first embodiment, the same components as those of the first embodiment are denoted by reference numerals in the 20s and detailed description thereof is omitted.

<Effect>
According to the above configuration, area control in which the display screen Gh shown in FIG. 8A is divided into an arbitrary number of areas can be performed, so that it is possible to cope with a large screen and power consumption can be reduced by area control.
In addition, the effect of 1st Embodiment is show | played similarly in 2nd Embodiment.
Further, the light source module Kl1 and the light source module Kr1 (Kr11,... Kr18) are provided at locations facing the light source modules Kl1 (Kl11,... Kl18) and the light source modules Kr1 (Kr11,. Since the collimator portions Cl1 and Cr1 having a taper rod structure that gradually increases in width as they are separated from each other are formed, the collimating property of the light emitted from the light source modules Kl1 and Kr1 is improved, and the back of the region that each of the light source modules Kl1 and Kr1 is responsible for It is possible to improve the light performance. In particular, it is effective for a large-screen display device having a large display screen Gh.

It should be noted that the width of the upper light guide plate 2a of the first embodiment gradually increases as the distance from the light source modules Kl1 (Kl11,... Kl1n), Kr1 (Kr11,... Kr1n) formed on the upper light guide plate 22a of the second embodiment increases. Needless to say, a collimator portion having a tapered rod structure may be formed.
Thereby, the collimator property of the light which injects into the upper layer light-guide plate 2a of 1st Embodiment can be improved, and backlight performance can be improved.
In the first and second embodiments described above, the liquid crystal television is exemplified as the lighting device and the liquid crystal display device using the lighting device. However, a personal computer display, a commercial large display device, and a PDA (Personal Digital Assistants). The present invention can be widely and effectively applied to various types of electronic devices such as lighting devices and liquid crystal display devices using the lighting devices.

(a) is a front view of the liquid crystal television of 1st Embodiment of this invention, (b) is the sectional view on the AA line of (a). It is the perspective view seen from diagonally upward which shows the state which decomposed | disassembled the principal part of the structure which displays an image | video on the display screen shown in FIG.1 (b). (a) is a front view showing an upper layer light guide plate in the liquid crystal television shown in FIG. 1 (a) and a light source module on the front left side and a light source module on the front right side for supplying light thereto, and (b) is an upper layer diagram. It is an expanded sectional view at the time of providing a conical groove part on the back of an upper layer light guide plate instead of a light scattering dot, and (c) is a CC line sectional view of the upper layer light guide plate shown in (a). FIG. 8D is a diagram showing the transmission of light emitted from the light source module in the upper light guide plate when the light source module Kl14 on the left front side is turned on. (a) is a front view which shows the lower layer light-guide plate in the liquid crystal television shown in FIG. 1 (a), the left back light source module which supplies light to this, and the right back light source module, (b) 4A is a cross-sectional view of the lower light guide plate taken along the line DD in FIG. 4A, and FIG. 4C is a diagram illustrating the light emitted from the light source module in the lower light guide plate when the light source module Kl25 on the back left side is turned on. It is the figure which showed the penetration condition. (a) is an enlarged view of the vicinity of the left collimator section and the left back light source module in the lower light guide plate, and (b) is a view from the left back light source module in the collimator section Cl3 shown in (a). It is an enlarged view which shows a mode that the emitted light is collimated. It is the figure which showed the positional relationship of the upper layer light-guide plate in the AA line cross section of Fig.1 (a), and a lower layer light-guide plate. (a) is an enlarged view in the direction of arrow B of the left light source module of FIG. 1 (a), (b) is an enlarged view of portion E of (a), and (c) is an enlarged view of (b). It is a FF line sectional enlarged view. (a) is a front view of the liquid crystal television of 2nd Embodiment of this invention, (b) is the GG sectional view enlarged on the GG line of (a). (a) is a front view of an upper layer light-guide plate and an upper layer light source module, (b) is the HH sectional view taken on the line of (a). (a) is a front view of an intermediate | middle layer light-guide plate and an intermediate | middle layer light source module, (b) is the II sectional view taken on the line of (a). (a) is a front view of a lower layer light-guide plate and a lower layer light source module, (b) is the JJ sectional view taken on the line (a). (a) is a front view of a conventional liquid crystal television, and (b) is a configuration of a light guide plate disposed on the back side of the display screen in the conventional liquid crystal television and a light source disposed on both outer sides of the light guide plate. It is the conceptual front view shown, (c) is a front view which shows the light-guide plate and light source of patent document 1. FIG.

Explanation of symbols

1 LCD panel (irradiation target)
10 LCD TV (Liquid Crystal Display)
20 LCD TV (Liquid Crystal Display)
21 LCD panel (irradiation target)
2a Upper light guide plate (light guide plate)
22a Upper light guide plate (light guide plate)
2b Lower layer light guide plate (light guide plate)
22b Middle-layer light guide plate (light guide plate)
22c Lower layer light guide plate (light guide plate)
2ar Back surface of upper light guide plate (opposite surface on which light guide plate irradiation object is placed)
Back side of 2br lower layer light guide plate (surface on the opposite side where the irradiation target of the light guide plate is arranged)
22ar Back surface of upper light guide plate (opposite surface on which light guide plate irradiation target is placed)
22br Rear surface of middle-layer light guide plate (opposite surface on which light guide plate irradiation target is arranged)
22cr Back surface of lower light guide plate (opposite surface on which light guide plate irradiation target is arranged)
3a Upper layer diffuse reflection sheet (diffuse reflection member, light extraction means)
3b Lower layer diffuse reflection sheet (diffuse reflection member, light extraction means)
23a Upper layer diffuse reflection sheet (diffuse reflection member, light extraction means)
23b Middle layer diffuse reflection sheet (diffuse reflection member, light extraction means)
23c Lower layer diffuse reflection sheet (diffuse reflection member, light extraction means)
B Blue light emitting diode (light source)
Cl (Cl1, Cl2,..., Cln) Collimator section Cl1 Collimator section Cl2 Collimator section Cl3 Collimator section Cr (Cr1, Cr2,..., Crn) Collimator section Cr1 Collimator section Cr2 Collimator section Cr3 Collimator section d1 Upper layer light scattering dot (reflection pattern) , Light extraction means)
d2 Lower layer light scattering dot (reflection pattern, light extraction means)
d21 Upper layer light scattering dot (reflection pattern, light extraction means)
d22 Middle layer light scattering dot (reflection pattern, light extraction means)
d23 Lower layer light scattering dot (reflection pattern, light extraction means)
G Green light-emitting diode (light source)
Gh display screen (lighting area)
Kl1 (Kl11, Kl12, ..., Kl1n) Light source module (light source)
Kl2 (Kl21, Kl22, ..., Kl2n) Light source module (light source)
Kl3 (Kl31, Kl32, ..., Kl3n) Light source module (light source)
Kr1 (Kr11, Kr12, ..., Kr1n) Light source module (light source)
Kr2 (Kr21, Kr22, ..., Kr2n) Light source module (light source)
Kr3 (Kr31, Kr32, ..., Kr3n) Light source module (light source)
le lens (lens part)
le1 Inclined reflector (light source reflector groove)
m Groove (reflective groove)
r1 (r11, r12,... r1n) region (divided region)
r2 (r21, r22,... r2n) region (divided region)
r3 (r31, r32,... r3n) region (divided region)
r4 (r41, r42,... r4n) region (divided region)
r1 (r11, r12,..., r18) region (divided region)
r2 (r21, r22,..., r28) region (divided region)
r3 (r31, r32,..., r38) region (divided region)
r4 (r41, r42,..., r48) region (divided region)
r5 (r51, r52,..., r58) region (divided region)
r6 (r61, r62,..., r68) region (divided region)
R Red light emitting diode (light source)
S lighting device 2S lighting device

Claims (10)

A light source that emits light, a transparent light guide plate that guides light from the light source in an extending direction and emits the guided light toward an irradiation target in a direction perpendicular to the extending direction, and the guide An illumination device comprising an optical sheet that makes light that has passed through a light plate uniform light directed toward the irradiation target,
The light guide plate is disposed on a side opposite to the side on which the irradiation target is disposed, and includes light extraction means for reflecting light leaking from the light guide plate or light traveling in the light guide plate toward the irradiation target,
The light guide plate is provided in a plurality of layers,
The light source is provided for each divided region that is arranged toward the light guide plate at a position along the side end surface of the light guide plate and divides the illumination region to be irradiated,
The light extraction means is provided at least in the stacking direction so as not to overlap the division region,
Each of the divided regions comprises light intensity control means capable of individually controlling the light intensity ,
The light guide plate is opposed to the divided region of the light guide object that guides light from the light source, and gradually irradiates the surface opposite to the side where the irradiation object is disposed toward the center side. Inclined to approach the target,
As the light extraction means, a reflective pattern or a reflective groove portion is provided in a higher density in the opposite side facing the divided area of the light guide plate,
In the optical path of the light guide plate leading to the light extraction means, the width of the light guide plate gradually increases as the distance from the light source increases, and the degree of parallelism of the light from the light source toward the light guide target is determined. An illumination device, wherein a collimator portion to be raised is formed . The illuminating device according to claim 1, wherein a diffuse reflection member is provided as the light extraction unit in a part between the light guide plates. Disposing the diffuse reflection member of the light extraction means between the collimator part of the light guide plate and another light guide plate adjacent to the collimator part,
The illumination device according to claim 1 , wherein the diffuse reflection member is formed with a light shielding layer that shields light emitted from the other light guide plate adjacent or adjacent thereto. The lighting device according to claim 1, wherein the light source is a linear fluorescent tube. The lighting device according to claim 1, wherein the light source is formed by arranging point light sources in a line. The point light source is a light emitting diode;
The illumination device according to claim 5 , wherein a light source reflecting groove portion that is recessed toward the irradiation target is formed between the light emitting diodes in a lens portion that is formed to cover the light emitting diodes. The illumination device according to claim 6 , wherein the light source reflection groove of the lens unit has a triangular cross section in the lateral direction. The lighting device according to claim 1, wherein the light source disposed toward the light guide plate closest to the irradiation target among the light guide plates is a white light emitting diode. The lighting device according to any one of claims 1 to 8 , comprising:
The liquid crystal display device, wherein the irradiation target is a liquid crystal panel that includes a liquid crystal layer and a color filter and transmits light from the illumination device to display an image. The liquid crystal display device according to claim 9 , wherein the light amount of each light source of the illumination device is controlled based on information of an image displayed on the liquid crystal panel.

Images