WO2012165247A1

WO2012165247A1 - Illumination device, display device, and television receiving device

Info

Publication number: WO2012165247A1
Application number: PCT/JP2012/063149
Authority: WO
Inventors: 泰守黒水
Original assignee: シャープ株式会社
Priority date: 2011-05-30
Filing date: 2012-05-23
Publication date: 2012-12-06

Abstract

This backlight device (12) is provided with: multiple LEDs (24) arranged side by side intermittently; a light guide plate (26) having a light entrance surface (26b) into which light enters from the LEDs (24) and which, parallel with the arrangement direction of the LEDs (24), is arranged oppositely from the LEDs (24) while maintaining a distance therefrom, and having a light exit surface (26a) which emits the light entering the light entrance surface (26b); a pair of light source sandwiching units (22c, 27c) arranged on both sides of the LEDs (24), on the side of the light exit surface (26a) of the light guide plate (26) and the side opposite of said light exit surface (26a); and light directing units (33) which are arranged, in accordance with the arrangement pattern of the LEDs (24) (light source arrangement area LA), on the surface opposite of the LEDs (24) of at least one of the pair of light source sandwiching units (22c, 27c), and which direct light from the LEDs (24) towards the non-arrangement pattern of LEDs (24) (the light source non-arrangement area LN).

Description

Lighting device, display device, and television receiver

The present invention relates to a lighting device, a display device, and a television receiver.

In recent years, the display elements of image display devices such as television receivers are shifting from conventional cathode ray tubes to thin display panels such as liquid crystal panels and plasma display panels, which enables thinning of image display devices. Since the liquid crystal panel used for the liquid crystal display device does not emit light by itself, a backlight device is separately required as a lighting device, and the backlight device is roughly classified into a direct type and an edge light type according to the mechanism. In order to further reduce the thickness of the liquid crystal display device, it is preferable to use an edge light type backlight device, and an example described in Patent Document 1 below is known.

JP 2002-116440 A

(Problems to be solved by the invention)
An edge-light type backlight device may adopt a configuration in which a plurality of light sources are intermittently arranged in parallel along a light incident surface provided at an end portion of a light guide plate. In this case, the following problem may occur. There is. That is, the light quantity emitted from the plurality of light sources and incident on the light incident surface may be uneven due to the arrangement pattern and the non-arrangement pattern in the plurality of light sources intermittently arranged in parallel. In particular, when the distance between the light source and the light incident surface is narrowed in order to narrow the frame of the liquid crystal display device and the backlight device, the above-described problem of unevenness tends to become more prominent.

The present invention has been completed based on the above situation, and an object thereof is to suppress luminance unevenness.

(Means for solving problems)
The illuminating device of the present invention is a surface parallel to the alignment direction of the plurality of light sources arranged in a row intermittently, and arranged in an opposing manner with a space between the light sources. A light guide plate having a light incident surface on which light from the light source is incident, a light output surface for emitting incident light, and a light output side of the light guide plate and the opposite side sandwich the light source. A pair of light source sandwiching portions and a surface of at least one of the pair of light source sandwiching portions facing the light source, following the arrangement pattern of the light sources, and transmitting light from the light sources to the light sources. And a light directing unit that directs toward the non-arranged pattern side.

In this way, the light emitted from the plurality of light sources enters the light incident surface that is arranged in parallel with the light source arrangement direction and has an interval between the light sources, and then is guided. After being propagated through the light plate, the light is emitted from the light exit surface. Here, the amount of light incident on the light incident surface of the light guide plate may be uneven due to the arrangement pattern and the non-arrangement pattern in the plurality of light sources arranged intermittently, and in particular, the narrow frame in the illumination device. If the distance between the light source and the light incident surface is narrowed in order to reduce the size, the occurrence of unevenness tends to become more prominent.

In that respect, in the present invention, the light directing unit that directs the light from the light source toward the non-arrangement pattern side of the light source follows the arrangement pattern of the light source on the surface facing at least one of the pair of light source sandwiching portions. Since the light is incident on the light incident surface, light that tends to be excessive in the light source arrangement pattern by the light directing unit, and light source non-arrangement pattern that tends to lack light. Can be directed to the side, thereby reducing the difference in the amount of light. Accordingly, the amount of light incident on the light incident surface of the light guide plate is made uniform regardless of the arrangement pattern and the non-arrangement pattern in the plurality of light sources arranged intermittently side by side, and unevenness hardly occurs. As a result, luminance unevenness is less likely to occur in the light emitted from the light exit surface of the light guide plate. In particular, this is also useful for narrowing the frame of the lighting device.

The following configuration is preferable as an embodiment of the present invention.
(1) The light directing portion is disposed over the entire area of the light source arrangement pattern on the surface facing the light source in at least one of the pair of light source sandwiching portions. If it does in this way, the light which tends to become excessive by the light directing part distribute | arranged over the whole region of the arrangement pattern of a light source can be more efficiently directed to the non-arrangement pattern side of a light source. Thereby, luminance unevenness can be more effectively suppressed.

(2) The light directing portion is arranged in a range from the arrangement pattern of the light source to an end portion of the non-arrangement pattern of the light source on a surface facing the light source in at least one of the pair of light source sandwiching portions. In addition, the light from the light source is directed toward the center of the non-arrangement pattern of the light source. In this way, at the end of the light source non-arrangement pattern on the surface facing the light source in at least one of the pair of light source sandwiching portions, the amount of light from the light source is larger than the central portion of the light source non-arrangement pattern. Therefore, the luminance unevenness can be further suppressed by directing the light from the light source toward the central portion by the light directing portion at the end portion.

(3) The light directing portion is disposed on a surface facing the light source in one of the pair of light source sandwiching portions. In this way, it is possible to sufficiently equalize the amount of light incident on the light incident surface by the light directing portion disposed on the surface facing the light source in one of the pair of light source sandwiching portions. As compared with the case where the light directing portions are respectively disposed on both of the pair of light source sandwiching portions, it is possible to cope with low cost.

(4) The light directing unit is disposed on a light emitting side of the pair of light source sandwiching units with respect to the light source. In this way, after the light directed to the non-arranged pattern side of the light source by the light directing unit is directed to the side opposite to the light emitting side in the light source sandwiching portion arranged on the light emitting side with respect to the light source Reflected by the surface facing the light source in the light source sandwiching portion arranged on the side opposite to the light emitting side, or incident on the light incident surface and heading toward the surface of the light guide plate opposite to the light emitting side become. Accordingly, it is avoided that the light directed to the non-placement pattern side of the light source by the light directing portion is incident on the light incident surface and is emitted as it is from the light exit surface, so that the luminance unevenness is less likely to occur in the emitted light.

(5) One of the pair of light source sandwiching portions is a pressing member that presses the light guide plate from the light emitting side. In this way, the light guide plate can be pressed from the light emission side as the pressing member is assembled, and the light source sandwiching portion of the pressing member can be arranged at an appropriate position with respect to the light source and the light guide plate. it can. Thereby, it is excellent in assembly workability.

(6) One of the pair of light source sandwiching portions is a chassis that houses the light source and the light guide plate. In this way, when the light source and the light guide plate are accommodated in the chassis, the light source and the light guide plate are arranged at appropriate positions with respect to the light source sandwiching portion of the chassis. Thereby, it is excellent in assembly workability.

(7) The light directing unit is disposed on a surface facing the light source in at least one of the pair of light source sandwiching portions and a surface facing the light source in the reflecting member. The lens unit is configured to direct light toward the non-arrangement pattern side of the light source by reflecting the light from the light source with the reflecting member while refracting the light. If it does in this way, the light from a light source can be efficiently directed to the non-arrangement pattern side of a light source by the reflective member and lens part which constitute a light directing part.

(8) The reflection member is formed with an opening that follows the non-arrangement pattern of the light source, and a low light reflectance portion having a relatively low light reflectance by the light source sandwiching portion exposed through the opening. In contrast, a high light reflectance portion having a relatively high light reflectance is constituted by the reflecting member. In this case, when the light source sandwiched portion in which the light directing portion is disposed faces the portion facing the non-placement pattern of the light source on the surface facing the light source, the light from the light source is irradiated without passing through the lens portion. There is a possibility that the light reflected there will be directed to the arrangement pattern side of the light source. Even in such a case, the reflection member has an opening that follows the non-placement pattern of the light source, and the light that does not pass through the lens part described above is a low light reflectance part that is configured by the light source sandwiching part exposed through the opening. Therefore, the reflected light quantity of the light reflected there is suppressed. As a result, even if the reflected light from the low light reflectance portion is directed to the light source arrangement pattern side, it is possible to reduce the deterioration in the unevenness of the incident light quantity on the light incident surface due to the reflected light, resulting in uneven brightness. It is considered that it contributes to prevention. In addition, since the low light reflectance part and the high light reflectance part are configured by forming the opening in the reflecting member, the cost can be reduced compared to the case where the reflecting member is printed. can do.

(9) A lens-attached sheet that extends along the arrangement direction of the light sources and has the lens portion is disposed on a surface of the reflecting member that faces the light sources. In this way, by arranging the lens-attached sheet on the surface of the reflecting member that faces the light source, the lens portion is arranged at an appropriate position, so that the workability is excellent.

(10) The light directing portion extends along the arrangement direction of the light sources on a surface facing the light sources in at least one of the pair of light source sandwiching portions and guides light from the light sources. The light guide member is refracted by the first refracting surface and a first refracting surface that refracts the light from the light source and directs it along the direction in which the light sources are arranged. A second refracting surface is formed that further refracts light and directs the light toward the side facing the light guide member of the pair of light source sandwiching portions. If it does in this way, light will be efficiently directed to the non-arrangement pattern side of a light source by refracting light from a light source by the 1st refracting surface and the 2nd refracting surface in a light guide member which constitutes a light directing part. be able to.

Next, in order to solve the above problem, a display device of the present invention includes the above-described illumination device and a display panel that performs display using light from the illumination device.

According to such a display device, since the illumination device that supplies light to the display panel is less likely to cause uneven brightness in the emitted light, it is possible to realize display with excellent display quality.

A liquid crystal panel can be exemplified as the display panel. Such a display device can be applied as a liquid crystal display device to various uses such as a display of a television or a personal computer, and is particularly suitable for a large screen.

(The invention's effect)
According to the present invention, luminance unevenness can be suppressed.

1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention. Exploded perspective view showing schematic configuration of liquid crystal display device Sectional drawing which shows the cross-sectional structure along the long side direction of a liquid crystal panel Enlarged plan view showing the planar configuration of the array substrate Enlarged plan view showing the planar configuration of the CF substrate The top view which shows arrangement | positioning structure of the chassis in the backlight apparatus with which a liquid crystal display device is equipped, a light-guide plate, and an LED board. Vii-vii sectional view of FIG. Viii-xiii sectional view of FIG. Sectional view taken along line ix-ix in FIGS. 7 and 8 Xx sectional view of FIG. Bottom view of a frame in a backlight device provided in a liquid crystal display device The main part enlarged view of the light directing part in FIG. The principal part expanded sectional view of the light directing part which concerns on Embodiment 2 of this invention. The principal part expanded sectional view of the light directing part which concerns on Embodiment 3 of this invention. The principal part expanded sectional view of the light directing part which concerns on Embodiment 4 of this invention. The principal part expanded sectional view of the light directing part which concerns on Embodiment 5 of this invention. The principal part expanded sectional view of the light directing part which concerns on Embodiment 6 of this invention. The principal part expanded sectional view of the light directing part which concerns on Embodiment 7 of this invention. The principal part expanded sectional view of the light directing part which concerns on Embodiment 8 of this invention. An enlarged plan view showing a planar configuration of a CF substrate according to another embodiment (1) of the present invention. An enlarged plan view showing a planar configuration of a CF substrate according to another embodiment (2) of the present invention. An enlarged plan view showing a planar configuration of a CF substrate according to another embodiment (3) of the present invention. An enlarged plan view showing a planar configuration of a CF substrate according to another embodiment (4) of the present invention. An enlarged plan view showing a planar configuration of a CF substrate according to another embodiment (5) of the present invention. An enlarged plan view showing a planar configuration of a CF substrate according to another embodiment (6) of the present invention. The enlarged plan view which shows the plane structure of the array substrate which concerns on other embodiment (6) of this invention. An enlarged plan view showing a planar configuration of a CF substrate according to another embodiment (7) of the present invention. An enlarged plan view showing a planar configuration of a CF substrate according to another embodiment (8) of the present invention. The enlarged plan view which shows the plane structure of the array substrate which concerns on other embodiment (8) of this invention. An enlarged plan view showing a planar configuration of a CF substrate according to another embodiment (11) of the present invention. The enlarged plan view which shows the plane structure of the array board | substrate which concerns on other embodiment (12) of this invention. An enlarged plan view showing a planar configuration of a CF substrate according to another embodiment (12) of the present invention.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In this embodiment, the liquid crystal display device 10 is illustrated. In addition, a part of each drawing shows an X axis, a Y axis, and a Z axis, and each axis direction is drawn to be a direction shown in each drawing. Moreover, let the upper side shown in FIG. 7 be a front side, and let the lower side of the figure be a back side.

(TV receiver)
As shown in FIG. 1, the television receiver TV according to the present embodiment includes a liquid crystal display device 10 that is a display device, front and back cabinets Ca and Cb that are accommodated so as to sandwich the liquid crystal display device 10, and power supply. Power supply circuit board P, a tuner (receiving unit) T capable of receiving a TV image signal, an image conversion circuit board VC for converting the TV image signal output from the tuner T into an image signal for the liquid crystal display device 10 And a stand S. The liquid crystal display device 10 has a horizontally long (longitudinal) rectangular shape (rectangular shape) as a whole, the long side direction is the horizontal direction (X-axis direction), and the short side direction is the vertical direction (Y-axis direction, vertical direction). They are housed in a state of almost matching each other. As shown in FIG. 2, the liquid crystal display device 10 includes a liquid crystal panel 11 that is a display panel and a backlight device (illumination device) 12 that is an external light source, which are integrated by a frame-like bezel 13 or the like. Is supposed to be retained.

(LCD panel)
The configuration of the liquid crystal panel 11 in the liquid crystal display device 10 will be described. The liquid crystal panel 11 has a horizontally long (longitudinal) rectangular shape (rectangular shape) as a whole. As shown in FIG. 3, a pair of transparent (translucent)

glass substrates

11a and 11b, And a liquid crystal layer 11c containing liquid crystal, which is a substance whose optical characteristics change with application of an electric field. The

substrates

11a and 11b maintain a gap corresponding to the thickness of the liquid crystal layer. In the state, they are bonded together by a sealing agent (not shown). Further,

polarizing plates

11d and 11e are attached to the outer surface sides of both the

substrates

11a and 11b, respectively. Note that the long side direction of the liquid crystal panel 11 coincides with the X-axis direction, and the short side direction coincides with the Y-axis direction.

Among the

substrates

11a and 11b, the front side (front side) is the CF substrate 11a, and the back side (back side) is the array substrate 11b. As shown in FIG. 4, on the inner surface of the array substrate 11b, that is, the surface on the liquid crystal layer 11c side (the surface facing the CF substrate 11a), TFTs (Thin Film Transistors) 14 and pixel electrodes 15 which are switching elements are matrixed. A large number of gate wirings 16 and source wirings 17 are arranged around the TFTs 14 and the pixel electrodes 15 so as to surround the TFTs 14 and the pixel electrodes 15. The pixel electrode 15 has a vertically long (longitudinal) rectangular shape (rectangular shape) in which the long side direction coincides with the Y-axis direction and the short side direction coincides with the X-axis direction. It consists of a transparent electrode such as (Zinc Oxide). The gate wiring 16 and the source wiring 17 are connected to the gate electrode and the source electrode of the TFT 14, respectively, and the pixel electrode 15 is connected to the drain electrode of the TFT 14. Further, as shown in FIG. 3, an alignment film 18 for aligning liquid crystal molecules is provided on the TFT 14 and the pixel electrode 15 on the liquid crystal layer 11c side. A terminal portion led out from the gate wiring 16 and the source wiring 17 is formed at an end portion of the array substrate 11b, and a driver component for driving a liquid crystal (not shown) is connected to the anisotropic conductive film (not shown). ACF (Anisotropic Conductive Film) is connected by crimping, and the driver component for driving the liquid crystal is electrically connected to a display control circuit board (not shown) via various wiring boards. This display control circuit board is connected to an image conversion circuit board VC (see FIG. 1) in the television receiver TV, and each

wiring

16, 17 via a driver component based on an output signal from the image conversion circuit board VC. It is assumed that a drive signal is supplied to.

On the other hand, on the inner surface of the CF substrate 11a, that is, the surface on the liquid crystal layer 11c side (the surface facing the array substrate 11b), as shown in FIG. 5, a large number of colored portions corresponding to the respective pixels on the array substrate 11b side. A color filter 19 in which the portions R, G, B, and Y are arranged in a matrix (matrix) is provided. The color filter 19 according to the present embodiment includes a yellow colored portion Y in addition to a red colored portion R, a green colored portion G, and a blue colored portion B that are the three primary colors of light. The colored portions R, G, B, and Y selectively transmit light of each corresponding color (each wavelength). Each colored portion R, G, B, Y has a vertically long (longitudinal) rectangular shape (rectangular shape) in which the long side direction coincides with the Y-axis direction and the short side direction coincides with the X-axis direction, like the pixel electrode 15. I am doing. Between the colored portions R, G, B, and Y, a lattice-shaped light shielding layer (black matrix) BM is provided to prevent color mixing. As shown in FIG. 3, a counter electrode 20 and an alignment film 21 are sequentially stacked on the color filter 19 on the CF substrate 11 a on the liquid crystal layer 11 c side.

The arrangement and size of the colored portions R, G, B, and Y constituting the color filter 19 will be described in detail. As shown in FIG. 5, the colored portions R, G, B, and Y are arranged in a matrix with the X-axis direction as the row direction and the Y-axis direction as the column direction. , Y have the same dimension in the column direction (Y-axis direction), but the dimension in the row direction (X-axis direction) is different for each colored portion R, G, B, Y. Specifically, the colored portions R, G, B, and Y are arranged in the row direction in the order of the red colored portion R, the green colored portion G, the blue colored portion B, and the yellow colored portion Y from the left side shown in FIG. Among them, the red colored portion R and the blue colored portion B in the row direction are relatively larger than the yellow colored portion Y and the green colored portion G in the row direction. It is said. That is, the colored portions R and B having relatively large dimensions in the row direction and the colored portions G and Y having relatively small dimensions in the row direction are alternately and repeatedly arranged in the row direction. Thereby, the area of the red coloring part R and the blue coloring part B is made larger than the areas of the green coloring part G and the yellow coloring part Y. The areas of the blue colored portion B and the red colored portion R are equal to each other. Similarly, the areas of the green colored portion G and the yellow colored portion Y are equal to each other. 3 and 5 show a case where the areas of the red colored portion R and the blue colored portion B are about 1.6 times the areas of the yellow colored portion Y and the green colored portion G. Show.

As the color filter 19 is configured as described above, in the array substrate 11b, as shown in FIG. 4, the dimension in the row direction (X-axis direction) of the pixel electrode 15 varies from column to column. . That is, among the pixel electrodes 15, the size and area in the row direction of the pixel electrode 15 that overlaps with the red color portion R and the blue color portion B are the same as those in the row direction of the pixel electrode 15 that overlaps with the yellow color portion Y and the green color portion G. It is relatively larger than the size and area. The gate wirings 16 are all arranged at an equal pitch, while the source wirings 17 are arranged at two different pitches depending on the dimensions of the pixel electrodes 15 in the row direction.

As described above, since the liquid crystal display device 10 according to the present embodiment uses the liquid crystal panel 11 including the color filter 19 including the four colored portions R, G, B, and Y, as shown in FIG. The television receiver TV is provided with a dedicated image conversion circuit board VC. That is, the image conversion circuit board VC converts the television image signal output from the tuner T into an image signal of each color of blue, green, red, and yellow, and outputs the generated image signal of each color to the display control circuit board. can do. Based on this image signal, the display control circuit board drives the TFTs 14 corresponding to the pixels of each color in the liquid crystal panel 11 via the

wirings

16 and 17, and transmits the colored portions R, G, B, and Y of each color. The amount of light can be appropriately controlled.

(Backlight device)
Next, the configuration of the backlight device 12 in the liquid crystal display device 10 will be described. As shown in FIG. 2, the backlight device 12 includes a chassis 22 having a substantially box shape having an opening (light emitting portion) that opens toward the front side (the liquid crystal panel 11 side), and an opening of the chassis 22. And a group of optical members 23 arranged in a covering manner. Further, in the chassis 22, an LED 24 that is a light source, an LED substrate 25 on which the LED 24 is mounted, a light guide plate 26 that guides light from the LED 24 and guides it to the optical member 23 (the liquid crystal panel 11), and a light guide. A frame (pressing member) 27 for pressing the optical plate 26 from the front side is provided. The backlight device 12 is a so-called edge light type (side light type) in which the LEDs 24 mounted on the LED substrate 25 are arranged at both ends of the light guide plate 26, respectively. The edge light type backlight device 12 is integrally assembled to the liquid crystal panel 11 by a bezel 13 having a frame shape, thereby constituting the liquid crystal display device 10.

(Chassis)
As shown in FIGS. 7 and 10, the chassis 22 is made of metal, and includes a bottom plate 22a having a horizontally long rectangular shape as in the liquid crystal panel 11, and side plates 22b rising from the outer ends of the respective sides of the bottom plate 22a. As a whole, it has a shallow, generally box shape that opens toward the front side. The chassis 22 (bottom plate 22a) has a long side direction that matches the X-axis direction (horizontal direction), and a short side direction that matches the Y-axis direction (vertical direction). Further, the frame 27 and the bezel 13 can be screwed to the side plate 22b.

(Optical member)
As shown in FIG. 2, the optical member 23 has a horizontally long rectangular shape in a plan view, like the liquid crystal panel 11 and the chassis 22. The optical member 23 is placed on the front side (light emitting side) of the light guide plate 26 and is interposed between the liquid crystal panel 11 and the light guide plate 26. The optical member 23 includes a diffusion plate 23a disposed on the back side and an optical sheet 23b disposed on the front side. The diffusing plate 23a has a structure in which a large number of diffusing particles are dispersed in a substrate made of a substantially transparent resin having a predetermined thickness and has a function of diffusing transmitted light. The optical sheet 23b has a sheet shape that is thinner than the diffusion plate 23a, and three optical sheets 23b are stacked. Specific types of the optical sheet 23b include, for example, a diffusion sheet, a lens sheet, a reflective polarizing sheet, and the like, which can be appropriately selected and used. 7 to 10, the illustration of the optical member 23 is simplified.

(flame)
As shown in FIGS. 2 and 11, the frame 27 is formed in a horizontally long frame shape (frame shape) extending along the outer peripheral edge portions of the optical member 23 and the light guide plate 26 as a whole. In addition, the outer peripheral edge of the light guide plate 26 can be pressed from the front side over the entire circumference. The frame 27 is made of a synthetic resin and has a light shielding property by having a surface with, for example, a black color. Specifically, the frame 27 protrudes from the outer peripheral end of the pressing base 27a toward the back side and surrounds the side plate 22b of the chassis 22 from the outside (externally fitted). ) It is composed of a peripheral wall portion 27b that forms a short cylindrical shape. The holding base portion 27a has a pair of short side portions and long side portions, and a pair of long side portions of the holding base portion 27a and a pair of first light source sandwiching portions 27c sandwiching the LED 24 with the bottom plate 22a of the chassis 22; Is done. The front side surfaces of the pair of first light source sandwiching portions 27c, that is, the surfaces facing the LEDs 24 (the surfaces facing the LEDs 24, the surfaces receiving the light from the LEDs 24, and the surfaces exposed to the light from the LEDs 24) are shown in FIGS. As shown in FIG. 8, a pair of first reflection sheets 28 that reflect light are respectively attached. The first reflection sheet 28 is made of a synthetic resin and has a white surface with excellent light reflectivity. The first reflection sheet 28 has a size that extends over almost the entire length of the long side portion (first light source sandwiching portion 27 c) of the frame 27, and is in direct contact with the end portion of the light guide plate 26 on the LED 24 side. In addition, the above-described end portion (the end portion having the light incident surface 26b) of the light guide plate 26 and the LED substrate 25 (including the LED 24) are collectively covered from the front side. Further, the frame 27 can receive the outer peripheral end of the liquid crystal panel 11 from the back side. The detailed configuration of the first reflection sheet 28 will be described later.

(LED)
As shown in FIG. 7, the LED 24 is mounted on the LED substrate 25 and is a so-called top type in which a surface opposite to the mounting surface with respect to the LED 25 is a light emitting surface. The LED 24 includes an LED chip that emits blue light as a light emission source, and includes a green phosphor and a red phosphor as phosphors that emit light when excited by blue light. Specifically, the LED 24 has a configuration in which an LED chip made of, for example, an InGaN-based material is sealed with a resin material on a substrate portion fixed to the LED substrate 25. The LED chip mounted on the substrate part has a main emission wavelength in the range of 420 nm to 500 nm, that is, in the blue wavelength region, and can emit blue light (blue monochromatic light) with excellent color purity. Is done. As a specific main emission wavelength of the LED chip, for example, 451 nm is preferable. On the other hand, the resin material that seals the LED chip is excited by the blue phosphor emitted from the LED chip and the green phosphor that emits green light by being excited by the blue light emitted from the LED chip. And a red phosphor emitting red light is dispersed and blended at a predetermined ratio. The LED 24 is made up of blue light (blue component light) emitted from these LED chips, green light (green component light) emitted from the green phosphor, and red light (red component light) emitted from the red phosphor. Is capable of emitting light of a predetermined color as a whole, for example, white or blueish white. Since yellow light is obtained by synthesizing the green component light from the green phosphor and the red component light from the red phosphor, the LED 24 includes the blue component light and the yellow component from the LED chip. It can be said that it also has the light of. The chromaticity of the LED 24 varies depending on, for example, the absolute value or relative value of the content of the green phosphor and the red phosphor, and accordingly the content of the green phosphor and the red phosphor is adjusted as appropriate. Thus, the chromaticity of the LED 24 can be adjusted. In this embodiment, the green phosphor has a main emission peak in the green wavelength region of 500 nm to 570 nm, and the red phosphor has a main emission peak in the red wavelength region of 600 nm to 780 nm. It is said.

Subsequently, the green phosphor and the red phosphor provided in the LED 24 will be described in detail. As the green phosphor, β-SiAlON, which is a kind of sialon phosphor, is preferably used. The sialon-based phosphor is a substance in which a part of silicon atoms of silicon nitride is replaced with aluminum atoms and a part of nitrogen atoms with oxygen atoms, that is, a nitride. A sialon-based phosphor that is a nitride is superior in luminous efficiency and durability as compared with other phosphors made of, for example, sulfides or oxides. Here, “excellent in durability” specifically means that, even when exposed to high-energy excitation light from an LED chip, the luminance does not easily decrease over time. For sialon phosphors, rare earth elements (eg, Tb, Yg, Ag, etc.) are used as activators. Β-SiAlON, which is a kind of sialon-based phosphor, has a general formula Si6-zAlzOzN8-z: Eu (z indicates a solid solution amount) or (Si, Al) in which aluminum and oxygen are dissolved in β-type silicon nitride crystal. ) 6 (O, N) 8: A substance represented by Eu. In the β-SiAlON according to the present embodiment, for example, Eu (europium) is used as an activator, and thereby the color purity of green light, which is emitted light, is particularly high. It is extremely useful in adjusting On the other hand, as the red phosphor, it is preferable to use casoon, which is a kind of cascading phosphor. Cousin-based phosphors are nitrides containing calcium atoms (Ca), aluminum atoms (Al), silicon atoms (Si), and nitrogen atoms (N). For example, other phosphors made of sulfides, oxides, etc. In comparison, it is excellent in luminous efficiency and durability. The cascading phosphor uses rare earth elements (for example, Tb, Yg, Ag, etc.) as an activator. Casun, which is a kind of cousin phosphor, uses Eu (europium) as an activator and is represented by the composition formula CaAlSiN3: Eu.

(LED board)
As shown in FIGS. 2 and 6, the LED substrate 25 has an elongated plate shape extending along the long side direction of the chassis 22 (X-axis direction, the longitudinal direction of the light incident surface 26b of the light guide plate 26). The main plate surface is accommodated in the chassis 22 in a posture parallel to the X-axis direction and the Z-axis direction, that is, in a posture orthogonal to the plate surfaces of the liquid crystal panel 11 and the light guide plate 26 (optical member 23). The LED boards 25 are arranged in pairs corresponding to both ends on the long side in the chassis 22, and are attached to the inner surfaces of the side plates 22b on the long side. The LED 24 having the above-described configuration is surface-mounted on the main plate surface of the LED substrate 25 and on the inner side, that is, the surface facing the light guide plate 26 side (the surface facing the light guide plate 26). A plurality of LEDs 24 are arranged in a line (linearly) in parallel on the mounting surface of the LED substrate 25 along the length direction (X-axis direction) with a predetermined interval. That is, it can be said that a plurality of LEDs 24 are intermittently arranged in parallel along the long side direction at both ends on the long side of the backlight device 12. The arrangement direction of the LEDs 24 coincides with the length direction (X-axis direction) of the LED substrate 25. Since the pair of LED substrates 25 are housed in the chassis 22 in such a posture that the mounting surfaces of the LEDs 24 are opposed to each other, the light emitting surfaces of the LEDs 24 respectively mounted on the LED substrates 25 are opposed to each other, The optical axis of each LED 24 substantially coincides with the Y-axis direction.

The base material of the LED substrate 25 is made of a metal such as an aluminum material same as that of the chassis 22, and a wiring pattern (not shown) made of a metal film such as a copper foil is formed on the surface thereof via an insulating layer. In addition, the outermost surface is formed with a reflective layer (not shown) that exhibits white light with excellent light reflectivity. The LEDs 24 arranged in parallel on the LED substrate 25 are connected in series by this wiring pattern. In addition, as a material used for the base material of LED board 25, it is also possible to use insulating materials, such as a ceramic.

(Light guide plate)
The light guide plate 26 is made of a synthetic resin material (for example, acrylic resin such as PMMA, polycarbonate, etc.) having a refractive index higher than air and substantially transparent (excellent translucency). As shown in FIGS. 2 and 6, the light guide plate 26 has a horizontally long rectangular shape as seen in a plan view like the liquid crystal panel 11 and the chassis 22, and the long side direction is the X axis direction and the short side direction. Respectively agree with the Y-axis direction. As shown in FIG. 7, the light guide plate 26 is disposed in the chassis 22 immediately below the liquid crystal panel 11 and the optical member 23, and a pair of LED substrates 25 disposed at both ends of the long side of the chassis 22. The Y-axis direction is interposed between them. Therefore, the alignment direction of the LED 24 (LED substrate 25) and the light guide plate 26 matches the Y-axis direction, while the alignment direction of the optical member 23 (liquid crystal panel 11) and the light guide plate 26 matches the Z-axis direction. It is assumed that both directions are orthogonal to each other. The light guide plate 26 introduces the light emitted from the LED 24 in the Y-axis direction, and rises and emits the light toward the optical member 23 side (Z-axis direction) while propagating the light inside. Have

As shown in FIGS. 6 and 7, the light guide plate 26 has a substantially flat plate shape extending along the bottom plate 22 a of the chassis 22 and the plate surfaces of the optical member 23. It is assumed to be parallel to the Y-axis direction. Of the main plate surface of the light guide plate 26, the surface facing the front side is a light emitting surface 26 a that emits internal light toward the optical member 23 and the liquid crystal panel 11. Of the outer peripheral end surfaces adjacent to the main plate surface of the light guide plate 26, both end surfaces on the long side that are long in the X-axis direction, that is, along the direction in which the LEDs 24 are arranged, are respectively connected to the LED 24 (LED substrate 25) and a predetermined length. They are opposed to each other with a space therebetween, and these form a pair of light incident surfaces 26b on which the light emitted from the LEDs 24 is incident. Each light incident surface 26b is a surface parallel to the X-axis direction (alignment direction of the LEDs 24) and the Z-axis direction, that is, the main plate surface of the LED substrate 25, and is a surface substantially orthogonal to the light emitting surface 26a. The Further, the alignment direction of the LED 24 and the light incident surface 26b coincides with the Y-axis direction and is parallel to the light emitting surface 26a.

As shown in FIG. 7, a predetermined space is held between the light incident surface 26 b of the light guide plate 26 and the LED 24, and a portion of the bottom plate 22 a of the chassis 22 facing the space, that is, on the frame 27 side. The portion that sandwiches the LED 24 with the first light source sandwiching portion 27c is the second light source sandwiching portion 22c. A pair of the second light source sandwiching portions 22c is arranged according to the arrangement of the pair of first light source sandwiching portions 27c and the pair of LEDs 24 (LED substrate 25). Light is reflected on the surface on the front side of the pair of second light source sandwiching portions 22c, that is, the surface facing the LED 24 (the surface facing the LED 24, the surface receiving the light from the LED 24, the surface exposed to the light from the LED 24). A pair of second reflection sheets 29 are respectively attached. That is, the space held between the LED 24 and the LED 24 and the light incident surface 26b includes the first reflection sheet 28 arranged on the front side (light emission side of the light guide plate 26) and the back side (light emission of the light guide plate 26). Sandwiched between the second reflection sheet 29 disposed on the opposite side). As a result, the light emitted from the LED 24 is repeatedly reflected between the reflecting

sheets

28 and 29, and thus efficiently enters the light incident surface 26b. The second reflection sheet 29 is made of a synthetic resin, like the first reflection sheet 28, and has a white surface with excellent light reflectivity. Further, the second reflection sheet 29 has a size capable of sandwiching the end portion having the light incident surface 26b of the LED substrate 25 and the light guide plate 26 in addition to the LED 24 with the first reflection sheet 28. Have.

The surface of the light guide plate 26 opposite to the light output surface 26a (the surface facing the bottom plate 22a of the chassis 22 and the surface received by the bottom plate 22a of the chassis 22) 26c reflects the light in the light guide plate 26 to the front side. A light guide reflection sheet 30 that can be raised is provided so as to cover the entire area. In other words, the light guide reflection sheet 30 is disposed between the bottom plate 22 a of the chassis 22 and the light guide plate 26. The light guide reflection sheet 30 is made of a synthetic resin, like the first reflection sheet 28 and the second reflection sheet 29 described above, and has a white surface with excellent light reflectivity. It should be noted that at least one of the light exit surface 26a and the opposite surface 26c of the light guide plate 26 has a reflection part (not shown) for reflecting internal light or a scattering part (not shown) for scattering internal light. Are patterned so as to have a predetermined in-plane distribution, whereby the light emitted from the light exit surface 26a is controlled to have a uniform distribution in the plane.

(Significance of making the liquid crystal panel four primary colors and changing the area ratio of the colored part of the color filter)
As described above, the color filter 19 of the liquid crystal panel 11 according to the present embodiment includes a yellow colored portion in addition to the colored portions R, G, and B, which are the three primary colors of light, as shown in FIGS. Since Y is included, the color gamut of the display image displayed by the transmitted light is expanded, so that it is possible to realize display with excellent color reproducibility. In addition, since the light transmitted through the yellow colored portion Y has a wavelength close to the peak of visibility, the human eye tends to perceive brightly even with a small amount of energy. Thereby, even if it suppresses the output of LED24 which the backlight apparatus 12 has, sufficient brightness | luminance can be obtained, the power consumption of LED24 can be reduced, and the effect that it is excellent also in environmental performance is acquired.

On the other hand, when the four primary color type liquid crystal panel 11 as described above is used, the display image of the liquid crystal panel 11 tends to be yellowish as a whole. In order to avoid this, in the backlight device 12 according to the present embodiment, the chromaticity in the LED 24 is adjusted to a blue color that is a complementary color of yellow, thereby correcting the chromaticity in the display image. For this reason, as described above, the LED 24 of the backlight device 12 has the main emission wavelength in the blue wavelength region and the highest light emission intensity in the blue wavelength region. ing.

When adjusting the chromaticity of the LED 24 as described above, it has been found by the inventor's research that the luminance of the emitted light tends to decrease as the chromaticity is made closer to white to blue. Therefore, in the present embodiment, the area ratio of the blue colored portion B constituting the color filter 19 is set to be relatively larger than that of the green colored portion G and the yellow colored portion Y, whereby the color filter The 19 transmitted light can contain more blue light which is a complementary color of yellow. Thereby, in adjusting the chromaticity of the LED 24 to correct the chromaticity of the display image, it is not necessary to adjust the chromaticity of the LED 24 so as to be blue so that the luminance reduction of the LED 24 due to the chromaticity adjustment is suppressed. It is possible.

Furthermore, according to the research of the inventors of the present application, it has been found that when the four primary color type liquid crystal panel 11 is used, the brightness of the red light among the light emitted from the liquid crystal panel 11 is lowered. This is because, in the four primary color type liquid crystal panel 11, compared to the three primary color type, the number of subpixels constituting one pixel increases from three to four, so the area of each subpixel decreases. It is presumed that the brightness of the red light is particularly lowered due to this. Therefore, in the present embodiment, the area ratio of the red colored portion R constituting the color filter 19 is set to be relatively larger than that of the green colored portion G and the yellow colored portion Y, whereby the color filter The transmitted light of 19 can contain a larger amount of red light, so that it is possible to suppress a decrease in lightness of the red light caused by the color filter 19 having four colors.

(Description of the configuration according to the main part of the present embodiment)
Of the pair of light

source sandwiching portions

22c and 27c that sandwich the LED 24 from the front side and the back side in the Z-axis direction, the LED 24 faces the LED 24 in the first light source sandwiching portion 27c disposed on the front side (light emitting side of the light guide plate 26). On the surface (the surface facing the LED 24, the surface receiving the light from the LED 24, the surface exposed to the light from the LED 24), as shown in FIG. 9, in addition to the first reflection sheet 28 described above, the lens unit 31. The lens-attached sheet (lens sheet, prism sheet) 32 having the above-mentioned is arranged, and the light from the LED 24 is converted into the non-arrangement pattern of the LED 24 by the first reflection sheet 28 and the lens portion 31 formed on the lens-attached sheet 32. A light directing unit 33 is configured to direct to the side. The light directing portion 33 is arranged on the surface facing the LED 24 in the first light source sandwiching portion 27c so as to follow the arrangement pattern of the LED 24, and can direct the light from the LED 24 toward the non-arrangement pattern side of the LED 24. It is possible. The “LED 24 arrangement pattern” herein refers to a light source arrangement area that is an arrangement range of the LEDs 24 in the X-axis direction, that is, the arrangement direction of the LEDs 24 (light sources that overlap with the LEDs 24 in the arrangement direction of the LEDs 24 (the positional relationship is the same)). Superimposition area) LA. On the other hand, the “non-arrangement pattern of LEDs 24” is a light source non-arrangement region that is a range in which the LEDs 24 are not arranged in the arrangement direction of the LEDs 24 (light sources that do not overlap with the LEDs 24 in the arrangement direction of the LEDs 24). Non-overlapping area) LN. Further, in the light source non-arrangement region LN described above, on the surface facing the LED 24 in the light

source sandwiching portions

22c and 27c, the region located between the LEDs 24 adjacent to each other in the arrangement direction of the LEDs 24 and the both ends in the arrangement direction of the LEDs 24 are arranged. A region that is shifted toward the ends of the pair of LEDs 24 (on the side opposite to the LED 24 adjacent to the center) is included.

Specifically, as shown in FIGS. 9 and 11, the first reflection sheet 28 disposed in the first light source sandwiching portion 27 c of the frame 27 follows a light source non-arrangement region LN that is a non-arrangement pattern of the LEDs 24. The opening 28a is partially formed. Therefore, the first reflection sheet 28 remains in a form that follows the light source arrangement area LA that is the arrangement pattern of the LEDs 24, and the light directing portion 33 that follows the light source arrangement area LA is formed by the non-formation portion of the opening 28a. It is configured. Specifically, a plurality of openings 28a are intermittently arranged in parallel along the extending direction (X-axis direction) in the first reflecting sheet 28, and the arrangement interval is associated with the arrangement interval of the LEDs 24. It is supposed to have been. In other words, the plurality of openings 28 a are formed in the first reflection sheet 28 so as to be positioned between the LEDs 24 adjacent to each other in the X-axis direction (the arrangement direction of the LEDs 24), and are arranged so as to be alternately arranged with the LEDs 24. ing. Accordingly, the opening 28a is in a positional relationship overlapping with a part of the light source non-arrangement region LN on the surface of the first light source sandwiching portion 27c facing the LED 24 in the X-axis direction. On the other hand, as for the non-formation part (remaining part) of the opening part 28a in the 1st reflection sheet 28, arrangement | positioning about the X-axis direction (arrangement direction of LED24) corresponds with the arrangement | positioning about the X-axis direction in several LED24. . Therefore, the non-formation part of the opening part 28a in the 1st reflection sheet 28 has the positional relationship which overlaps with the light source arrangement area | region LA in the surface facing LED24 of the 1st light source clamping part 27c.

A sheet 32 with a lens having a lens portion 31 is attached to the surface of the first reflective sheet 28 facing the LED 24 as shown in FIGS. The lens-attached sheet 32 is made of a synthetic resin material (for example, PET) having a refractive index higher than that of air and substantially transparent (exceeding translucency), and is formed on the first reflective sheet 28 (first light source sandwiching portion 27c). A sheet base material 34 having a sheet shape extending along the surface and a surface of the sheet base material 34 facing the LED 24 (a surface opposite to the first reflection sheet 28 side) and refracting light. It is composed of a possible lens part 31. The sheet base material 34 has substantially the same size as the first reflection sheet 28 (first light source sandwiching portion 27c) in a plan view, and has a longitudinal shape in which the arrangement direction of the LEDs 24 is the long side direction. . The sheet base material 34 covers each opening 28a in the first reflective sheet 28 from the back side (the LED 24 side).

As shown in FIG. 9, a plurality of lens units 31 are intermittently arranged in parallel along the X-axis direction (the alignment direction of the LEDs 24) in the sheet base material 34, and the arrangement in the X-axis direction is performed. However, it corresponds to the arrangement of the plurality of LEDs 24 in the X-axis direction. Therefore, the lens part 31 has a positional relationship overlapping the light source arrangement area LA on the surface of the first light source sandwiching part 27c facing the LED 24. In other words, the lens portion 31 is disposed at a position overlapping the non-formation portion of the opening 28a in the first reflection sheet 28 having the above-described configuration in a plan view, that is, a position following the light source arrangement area LA. The light directing portion 33 is configured together with the non-formation portion of the opening 28 a in the reflection sheet 28. In addition, the lens portion 31 has a dimension in the X-axis direction that is substantially equal to the same dimension of the first reflective sheet 28 where the opening 28a is not formed. In addition, the number of lens units 31 is equal to the number of LEDs 24 in parallel as shown in FIGS.

Specifically, as shown in FIG. 12, the lens unit 31 includes a plurality of unit lenses (unit prisms) 31 a having a substantially triangular cross-section cut along the X-axis direction along the X-axis direction. The configuration is arranged in parallel. Each unit prism 31a constituting the lens unit 31 has a pair of inclined surfaces facing the LED 24, and each of the pair of inclined surfaces is in the X-axis direction (the LED 24 arrangement direction) and the Z-axis direction (the LED 24 and each of the LED 24). It is inclined with respect to both of the light

source sandwiching portions

22c and 27c. The lens unit 31 (unit prism 31a) is configured to extend along the Y-axis direction, that is, the alignment direction of the LED 24 and the light incident surface 26b. Therefore, the lens unit 31 angles the light from the LED 24 mainly in the X-axis direction and the Z-axis direction, but hardly angulates in the Y-axis direction. Then, when the light from the sheet base material 34 (first reflection sheet 28) exits the lens unit 31, the lens unit 31 refracts the light at the inclined surface of each unit lens 31a that is an interface. And has a light condensing action to advance in parallel with the Z-axis direction. Conversely, when the light from the LED 24 is incident on the lens unit 31, the lens unit 31 refracts the light at the inclined surface of each unit lens 31a that is an interface, thereby widening the X-axis direction. Has a light diffusing action.

As shown in FIGS. 9 and 12, the lens portion 31 having the above-described configuration is disposed on the surface of the sheet base material 34 that faces the LED 24, so that the lens portion 31 is interposed between the first reflective sheet 28 and the LED 24. It can be said that it is arranged. Accordingly, the light traveling from the LED 24 toward the front side, that is, the first light source sandwiching portion 27c side is first refracted by being incident on the lens portion 31, and then reflected by the first reflecting sheet 28, whereby the back side, that is, the second side. The light travels toward the light source sandwiching portion 22c. Since the light reflected by the first reflection sheet 28 is refracted by the lens unit 31 at a previous stage and is given a predetermined angle so as to be diffused at a wide angle, at least a part of the light is not disposed. It is assumed that it goes to the area LN. That is, at least a part of the light emitted from the LED 24 and existing in the light source arrangement area LA is refracted by the lens unit 31 and then reflected by the first reflection sheet 28 so as to be directed to the light source non-arrangement area LN. It has become. Thereby, it is possible to distribute a part of the light from the light source arrangement area LA side where the light quantity tends to be excessive to the light source non-arrangement area LN side where the light quantity tends to be insufficient. In FIG. 12, of the light from the LED 24, the trajectory of light directed from the light source arrangement area LA to the light source non-arrangement area LN by the light directing unit 33 is illustrated by an arrow line.

As shown in FIGS. 9 and 12, the light directing portion 33 (the portion where the opening portion 28a is not formed in the lens portion 31 and the first reflection sheet 28) is centered in the X-axis direction with the LED 24 (light source arrangement region LA). Concentric with the same central position in FIG. In addition, the dimension W1 in the X-axis direction in the light directing unit 33 is relatively larger than the same dimension W2 in the LED 24 (light source arrangement area LA). Therefore, the light directing section 33 is formed wider in the X-axis direction than the light source arrangement area LA, and in addition to the entire area of the light source arrangement area LA, an end portion in the X-axis direction in the adjacent light source arrangement area LN. It can be said that it is arranged to reach the range. In other words, the light directing unit 33 is further extended from the light source arrangement area LA to the light source non-arrangement area LN side and is arranged over a part of the light source non-arrangement area LN. On the other hand, the opening portion 28a of the first reflection sheet 28 disposed between the adjacent light directing portions 33 has a central position in the X-axis direction that is coincident with the same central position in the light source non-arrangement region LN. There is no. In addition, the dimension (interval between adjacent light directing parts 33) W3 in the X-axis direction in the opening 28a is relatively smaller than the same dimension W4 in the light source non-arrangement region LN. That is, the opening 28a is formed to be narrower in the X-axis direction than the light source non-arrangement region LN, and is disposed at the center in the X-axis direction of the light source non-arrangement region LN, and has both ends in the X-axis direction. It can be said that it is not arranged in the department. The light directing portion 33 and the opening 28a are symmetrical with respect to the X-axis direction. Accordingly, the light directing portion 33 overlaps the same dimension at each end on the light source arrangement area LA side in a pair of light source non-arrangement areas LN adjacent to the light source arrangement area LA on both sides in the X-axis direction. It is arranged like this. Further, as shown in FIGS. 8 and 11, the lens part 31 and the opening part 28a constituting the light directing part 33 have a dimension in the Y-axis direction, that is, the alignment direction of the LED 24 and the light incident surface 26b. 25, the distance between the LED 24 mounting surface and the light incident surface 26b of the light guide plate 26 is substantially equal.

As described above, since the opening 28a is formed in the first reflection sheet 28, a part of the surface facing the LED 24 in the first light source sandwiching portion 27c to which the first reflection sheet 28 is attached is shown in FIG. And as shown in FIG. 9, it exposes to the LED24 side through the opening part 28a. Since the light source reflectance of the first light source sandwiching portion 27c is relatively lower than that of the first reflection sheet 28, the LED 24 passes through the opening 28a in the surface facing the LED 24 in the first light source sandwiching portion 27c. The portion exposed to the side is the low light reflectance portion 35. That is, the formation range of the opening 28 a in the first reflection sheet 28 coincides with the formation range of the low light reflectance portion 35. The low light reflectivity portion 35 is constituted by a part of the frame 27, and the surface color thereof is black. Therefore, the light reflectivity is close to 0% (for example, 0% to 0%). 10% range). On the other hand, the non-formation part of the opening part 28a which comprises the light directing part 33 among the 1st reflection sheets 28 becomes relatively higher in light reflectivity than the 1st light source clamping part 27c exposed through the opening part 28a. This constitutes the high light reflectance portion 36. Since the high light reflectance portion 36 is composed of the first reflection sheet 28 having a white surface, the light reflectance is a value close to 100% (for example, a range of 90% to 100%).

The low light reflectance part 35 is in a positional relationship overlapping with a part of the light source non-arrangement region LN on the surface of the first light source sandwiching part 27c facing the LED 24 in the X-axis direction, whereby the low light reflectance part 35 is a light source. It will be arranged in a part of the non-arrangement region LN. On the other hand, the high light reflectance part 36 is in a positional relationship overlapping with the light source arrangement area LA on the surface of the first light source sandwiching part 27c facing the LED 24 in the X-axis direction, and further, a pair adjacent to the light source arrangement area LA. The light source non-arrangement region LN has a positional relationship that overlaps with the end portion. The low light reflectance portion 35 and the high light reflectance portion 36 are alternately arranged in parallel along the X-axis direction on the surface facing the LED 24 of the first light source sandwiching portion 27c. As shown in FIG. 11, the black portion as the low light reflectance portion 31 and the white portion as the high light reflectance portion 32 are alternately and repeatedly arranged in the X-axis direction through the substantially transparent sheet 34 with the lens. It has a stripe shape.

(Description of functions and effects according to the main part of the present embodiment)
When the power supply of the liquid crystal display device 10 having the above configuration is turned on, the drive of the liquid crystal panel 11 is controlled by a control circuit (not shown), and driving power from a power supply board (not shown) is supplied to each LED 24 of the LED board 25. As a result, the drive is controlled. The light from each LED 24 is guided by the light guide member 26, so that the liquid crystal panel 11 is irradiated through the optical member 23, and a predetermined image is displayed on the liquid crystal panel 11. Hereinafter, the operation of the backlight device 12 will be described in detail.

When each LED 24 is turned on, the light emitted from each LED 24 enters the light incident surface 26b of the light guide member 26 as shown in FIG. Although a predetermined space is held between the LED 24 and the light incident surface 26b, the space is sandwiched between the first reflective sheet 28 on the front side and the second reflective sheet 29 on the back side. Accordingly, the light from the LED 24 is repeatedly reflected between the reflecting

sheets

28 and 29, and thus efficiently enters the light incident surface 26b. The light incident on the light incident surface 26 b is reflected by the light guide reflection sheet 30, propagates through the light guide member 26, is emitted from the light exit surface 26 a, and then passes through each optical member 23. The liquid crystal panel 11 is reached.

Here, the light amount incident on the light incident surface 26b of the light guide plate 26 may be uneven depending on the arrangement pattern and the non-arrangement pattern in the plurality of LEDs 24 arranged intermittently. That is, a relatively large amount of light emitted from the LED 24 is incident on a portion of the light incident surface 26b that directly faces the LED 24, in other words, the light source arrangement region LA that overlaps the LED 24 with respect to the arrangement direction of the LEDs 24. Is relatively lightly incident on a portion that does not directly face, in other words, in the light source non-arrangement region LN that does not overlap the LED 24 in the arrangement direction of the LEDs 24 (see FIG. 6). For this reason, unevenness occurs in the amount of light incident on the light incident surface 26b, which may cause uneven brightness in the emitted light emitted from the light exit surface 26a. In particular, when the interval between the LED 24 and the light incident surface 26b is narrowed in order to narrow the frame of the liquid crystal display device 10 and the backlight device 12, the light from the LED 24 directly enters the light incident surface 26b. Since the light is incident, the above-described unevenness tends to become more prominent. Here, “narrowing the frame” means to narrow the width of the frame portion which is a non-light emitting portion in the liquid crystal display device 10 and the backlight device 12, and this frame portion includes the LED 24, the LED substrate 25, And since the edge part which has the light-incidence surface 26b in the light-guide plate 26 is distribute | arranged, it is supposed that the above problems may arise.

Therefore, in the present embodiment, as shown in FIGS. 7 to 9, light from the LED 24 is applied to the surface facing the LED 24 in the first light source sandwiching portion 27 c among the pair of light

source sandwiching portions

22 c and 27 c sandwiching the LED 24. A light directing portion 33 that directs toward the light source non-arrangement region LN that is the non-arrangement pattern of the LED 24 is arranged following the light source arrangement region LA that is the arrangement pattern of the LED 24. Specifically, on the first reflection sheet 28 attached to the surface facing the LED 24 in the first light source sandwiching portion 27c, a lens-equipped sheet 32 having a lens portion 31 that is in a positional relationship overlapping with the light source arrangement region LA. The light directing unit 33 is configured by the lens unit 31 and the first reflection sheet 28. According to such a configuration, the light existing in the light source arrangement area LA out of the light from the LED 24 is transmitted by the light directing unit 33 following the light source arrangement area LA before entering the light incident surface 26b. At least a part thereof is directed to the light source non-arrangement region LN side. Specifically, in the light source arrangement area LA, the light traveling from the LED 24 to the front side is first incident on the lens unit 31 that constitutes the light directing unit 33 as shown in FIG. Refracted so as to diffuse at a wide angle in the X-axis direction. The light angled by the lens unit 31 travels through the sheet base material 34 and then is reflected by the surface of the first reflection sheet 28 so that at least a part of the light is not disposed outside the light source arrangement area LA. The process proceeds toward the area LN.

Here, if there is no lens part, the light parallel to the Z-axis direction from the LED 24 toward the first light source sandwiching part 27c is reflected by the first reflection sheet 28 and is directly parallel to the Z-axis direction. Since it goes to the LED 24 side, the amount of light in the light source arrangement area LA tends to be excessive. In contrast, in the present embodiment, as described above, the light parallel to the Z-axis direction from the LED 24 toward the first light source sandwiching portion 27c is refracted by the lens portion 31 and then reflected by the first reflecting sheet 28. As a result, it proceeds in an oblique direction with respect to the Z-axis direction and the X-axis direction, so that at least a part thereof goes out of the light source arrangement area LA and heads toward the light source non-arrangement area LN. Become. As a result, part of the light that tends to be excessive in the light source arrangement area LA can be distributed to the light source non-arrangement area LN side, thereby reducing the difference in light quantity that can occur between the areas LA and LN. it can. Accordingly, the amount of light incident on the light incident surface 26b of the light guide plate 26 is made uniform regardless of the light source arrangement area LA and the light source non-arrangement area LN in the plurality of LEDs 24 that are intermittently arranged side by side. Become.

Moreover, the light directing portion 33 is disposed on the surface of the first light source sandwiching portion 27c facing the LED 24 over the entire light source arrangement region LA and further to the end of the adjacent light source non-arrangement region LN. Therefore, light that tends to be excessive in the entire light source arrangement area LA can be more efficiently directed to the light source non-arrangement area LN side by the light directing section 33, and at the center side in the light source non-arrangement area LN. In contrast, even at the end portion where the light amount is relatively large, the light directing portion 33 can efficiently direct the light toward the center portion side, so that unevenness in the incident light amount on the light incident surface 26b is less likely to occur. Furthermore, since the light directing portion 33 is disposed on the first light source sandwiching portion 27 c disposed on the front side of the LED 24, that is, on the light emitting surface 26 a side of the light guide plate 26, no light source is disposed by the light directing portion 33. The light directed to the region LN side is directed to the back side, that is, the side opposite to the light emitting surface 26a side, and then reflected by the surface (second reflection sheet 29) facing the LED 24 in the second light source sandwiching portion 22c. Alternatively, the light is incident on the light incident surface 26b and travels toward the surface 26c of the light guide plate 26 opposite to the light emitting surface 26a side. Therefore, it is avoided that the light directed to the light source non-arrangement region LN side by the light directing unit 33 enters the light incident surface 26b and is emitted as it is from the light emitting surface 26a. In addition, the first reflective sheet 28 is formed with an opening 28a that follows the light source non-arrangement region LN, so that the portion exposed to the LED 24 through the opening 28a in the first light source sandwiching portion 27c is low. Since the first reflective sheet 28 constituting the light directing unit 33 is the high light reflectivity unit 36 in contrast to the light reflectivity unit 35, light is emitted from the LED 24 toward the first light source sandwiching unit 27c. Even if there is light that does not pass through the lens unit 31 constituting the directing unit 33, the light is irradiated to the low light reflectance unit 35 in the light source non-arrangement region LN, and is reflected there. The amount of light is suppressed very slightly. Since the light reflected by the low light reflectivity part 35 existing in the light source non-arrangement area LN may be directed to the light source arrangement area LA, the light source arrangement area LA and the light source are suppressed by suppressing the amount of light. This is suitable for reducing the difference in the amount of light that may occur with the non-arrangement region LN, and thus the unevenness in the amount of incident light on the light incident surface 26b is further less likely to occur. As described above, unevenness in luminance is less likely to occur in the outgoing light from the light outgoing surface 26a of the light guide plate 26. In particular, it is useful for narrowing the frame of the liquid crystal display device 10 and the backlight device 12.

As described above, the backlight device (illumination device) 12 according to the present embodiment includes a plurality of LEDs (light sources) 24 arranged intermittently side by side, and a surface parallel to the direction in which the LEDs 24 are arranged, and the LED 24. A light guide plate 26 having a light incident surface 26b on which light from the LED 24 is incident and a light exit surface 26a for emitting the incident light, and the light of the light guide plate 26, which are arranged to face each other with an interval therebetween. The LED 24 is disposed on a surface facing the LED 24 in at least one of the pair of light

source sandwiching portions

22c and 27c and the pair of light

source sandwiching portions

22c and 27c that are disposed so as to sandwich the LED 24 from the emission side and the opposite side. It is arranged following the pattern (light source arrangement area LA) and directs the light from the LED 24 toward the non-placement pattern (light source non-placement area LN) side of the LED 24. And a light directing portion 33.

In this way, after the light emitted from the plurality of LEDs 24 is incident on the light incident surface 26b which is arranged in parallel with the arrangement direction of the LEDs 24 and having an interval between the LEDs 24, After propagating through the light guide plate 26, the light is emitted from the light exit surface 26a. Here, the amount of light incident on the light incident surface 26b of the light guide plate 26 may be uneven depending on the arrangement pattern and the non-arrangement pattern in the plurality of LEDs 24 that are intermittently arranged side by side. When the distance between the LED 24 and the light incident surface 26b is narrowed in order to narrow the frame, the occurrence of unevenness tends to become more prominent.

In this regard, in the present embodiment, the light directing portion 33 that directs the light from the LED 24 toward the non-arrangement pattern side of the LED 24 on the surface facing the LED 24 in at least one of the pair of light

source sandwiching portions

22c and 27c. Since the light is arranged in accordance with the arrangement pattern, the light directing unit 33 causes the light that tends to be excessive in the arrangement pattern of the LED 24 until the light from the LED 24 enters the light incident surface 26b. It is possible to direct the LED 24 toward the non-arranged pattern side, thereby reducing the difference in light amount. Accordingly, the amount of light incident on the light incident surface 26b of the light guide plate 26 is made uniform regardless of the arrangement pattern and the non-arrangement pattern in the plurality of LEDs 24 that are intermittently arranged side by side, and unevenness hardly occurs. Thereby, luminance unevenness is less likely to occur in the outgoing light from the light outgoing surface 26a of the light guide plate 26. In particular, the backlight device 12 is useful for narrowing the frame.

Further, the light directing section 33 is arranged over the entire arrangement pattern of the LEDs 24 on the surface facing the LEDs 24 in at least one of the pair of light

source sandwiching sections

22c and 27c. If it does in this way, the light which tends to become excessive by the light directing part 33 distribute | arranged over the whole region of the arrangement pattern of LED24 can be directed to the non-arrangement pattern side of LED24 more efficiently. Thereby, luminance unevenness can be more effectively suppressed.

Further, the light directing portion 33 is arranged in a range from the arrangement pattern of the LED 24 to the end portion of the non-arrangement pattern of the LED 24 on the surface facing the LED 24 in at least one of the pair of light

source sandwiching portions

22c and 27c. The light from the LED 24 is directed to the center side in the non-arrangement pattern of the LED 24. If it does in this way, compared with the center part of the non-arrangement pattern of LED24 in the edge part of the non-arrangement pattern of LED24 in the surface facing LED24 in at least any one of a pair of light

source clamping parts

22c and 27c, it is LED24. Since the amount of light emitted from the LED 24 is relatively large, it is possible to further suppress uneven brightness by directing the light from the LED 24 toward the central portion by the light directing portion 33 at the end portion.

Further, the light directing portion 33 is disposed on a surface facing the LED 24 in one of the pair of light

source sandwiching portions

22c and 27c. In this way, it is possible to sufficiently equalize the amount of light incident on the light incident surface 26b by the light directing portion 33 disposed on the surface facing the LED 24 in one of the pair of light

source sandwiching portions

22c and 27c. . As compared with the case where the light directing portions are arranged on both of the pair of light

source sandwiching portions

22c and 27c, it is possible to cope with low cost.

Further, the light directing portion 33 is disposed on the light emitting portion of the pair of light

source sandwiching portions

22c and 27c that is disposed on the light emitting side with respect to the LED 24. In this way, in the light

source sandwiching portions

22c and 27c arranged on the light emitting side with respect to the LED 24, the light directed to the non-arranged pattern side of the LED 24 by the light directing portion 33 is opposite to the light emitting side. The light

source sandwiching portions

22c and 27c arranged on the side opposite to the light emitting side, the light is reflected on the surface facing the LED 24, or is incident on the light incident surface 26b to be out of the light guide plate 26. It goes to the opposite side. Accordingly, it is avoided that the light directed to the non-arrangement pattern side of the LED 24 by the light directing unit 33 is incident on the light incident surface 26b and is emitted as it is from the light emitting surface 26a. It becomes difficult.

Further, one of the pair of light

source sandwiching portions

22c and 27c is a frame (pressing member) 27 that presses the light guide plate 26 from the light emitting side. In this way, as the frame 27 is assembled, the light guide plate 26 can be pressed from the light emitting side, and the light source sandwiching portion 27c of the frame 27 is disposed at an appropriate position with respect to the LED 24 and the light guide plate 26. can do. Thereby, it is excellent in assembly workability.

Further, one of the pair of light

source sandwiching portions

22c and 27c is a chassis 22 that houses the LED 24 and the light guide plate 26. In this way, when the LED 24 and the light guide plate 26 are accommodated in the chassis 22, the LED 24 and the light guide plate 26 are arranged at appropriate positions with respect to the light source sandwiching portion 22 c of the chassis 22. Thereby, it is excellent in assembly workability.

The light directing unit 33 includes a first reflecting sheet (reflecting member) 28 disposed on a surface facing the LED 24 in at least one of the pair of light

source sandwiching portions

22c and 27c, and the LED 24 in the first reflecting sheet 28. The lens portion 31 is arranged on the opposite surface and is directed toward the non-arrangement pattern side of the LED 24 by reflecting the light from the LED 24 with the first reflection sheet 28 while refracting the light. If it does in this way, the light from LED24 can be efficiently directed to the non-arrangement pattern side of LED24 by the 1st reflective sheet 28 and lens part 31 which constitute light directing part 33.

Moreover, the opening part 28a which follows the non-arrangement pattern of LED24 is formed in the 1st reflective sheet 28, and the low light reflectance part with a relatively low light reflectance by the light source clamping part 27c exposed through the opening part 28a. In contrast, the first reflection sheet 28 constitutes a high light reflectance portion 36 having a relatively high light reflectance. In this way, on the surface facing the LED 24 in the light source sandwiching portion 27c in which the light directing portion 33 is disposed, the portion that follows the non-arrangement pattern of the LED 24 is irradiated with the light from the LED 24 without passing through the lens portion. The light reflected there may be directed to the arrangement pattern side of the LED 24. Even in such a case, the reflecting member is formed with the opening portion 28a that follows the non-arrangement pattern of the LED 24, and the light that does not pass through the lens portion 31 described above is formed by the light source sandwiching portion 27c that is exposed through the opening portion 28a. Since the light reflectance part 35 is irradiated, the amount of reflected light of the light reflected there is suppressed. Thereby, even if the reflected light from the low light reflectance portion 35 is directed to the arrangement pattern side of the LED 24, it is possible to reduce the unevenness of the incident light amount on the light incident surface 26b due to the reflected light, and as a result It is considered to contribute to prevention of uneven brightness. Moreover, since the low-light-reflectance part 35 and the high-light-reflectivity part 36 are comprised by forming the opening part 28a in the 1st reflective sheet 28, it compares with the case where it respond | corresponds by printing on a reflective member temporarily. And can be handled at low cost.

Further, on the surface of the first reflective sheet 28 that faces the LEDs 24, a lens-equipped sheet 32 that extends along the direction in which the LEDs 24 are arranged and has a lens portion 31 is disposed. In this way, by arranging the lens-equipped sheet 32 on the surface of the first reflective sheet 28 facing the LED 24, the lens unit 31 is arranged at an appropriate position, so that the workability is excellent.

<Embodiment 2>
A second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the configuration of the lens unit 131 is changed. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

As shown in FIG. 13, the lens unit 131 constituting the light directing unit 133 according to the present embodiment includes a plurality of unit lenses having a semicircular cross-sectional shape cut along the X-axis direction (LED 24 arrangement direction). 131a is a so-called cylindrical lens. That is, it can be said that the lens-attached sheet 132 according to the present embodiment is a lenticular lens sheet. When the light from the sheet base material 134 (the first reflection sheet 28) exits the lens unit 131, the lens unit 131 having such a configuration has its light on the arc-shaped surface of each unit lens 131a that is an interface. Is refracted so as to advance in parallel with the Z-axis direction. Conversely, when the light from the LED 24 is incident on the lens unit 131, the lens unit 131 refracts the light at the arc-shaped surface of each unit lens 131a that is an interface, so that the X-axis direction is It has a light diffusing action that diffuses to a wide angle.

<Embodiment 3>
Embodiment 3 of the present invention will be described with reference to FIG. In the third embodiment, a light guide member 37 is used instead of the lens-equipped sheet 32 described in the first embodiment. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

As shown in FIG. 14, the light guide member 37 according to the present embodiment is disposed on a surface of the first light source sandwiching portion 27 c that faces the LED 24, and has a longitudinal length that extends along the first light source sandwiching portion 27 c. It has a substantially flat plate shape. The first reflection sheet 28 and the lens-equipped sheet 32 described in the first embodiment are removed from the first light source sandwiching portion 27c. The light guide member 37 is made of a synthetic resin material (for example, acrylic resin such as PMMA or polycarbonate) having a refractive index higher than that of air and substantially transparent (excellent translucency), and the material is the same as that of the light guide plate 26. It is said. A first refracting surface 37a that refracts the light from the LED 24 and directs it along the X-axis direction (the direction in which the LEDs 24 are arranged) is provided on the surface of the light guide member 37 on the front side (first light source sandwiching portion 27c side). On the other hand, on the surface on the back side (LED 24 side), a second refracting surface 37b for further refracting the light refracted by the first refracting surface 37a toward the back side is formed. Thus, the light guide member 37 constitutes the light directing portion 233. Among these, the first refracting surface 37a is arranged in the light source arrangement region LA in the X-axis direction, while the second refracting surface 37b is arranged in the light source non-arrangement region LN. Each of the first refracting surface 37a and the second refracting surface 37b has an isosceles triangular cross section cut along the X-axis direction, and is inclined with respect to both the X-axis direction and the Z-axis direction. Yes. The first refracting surface 37a and the second refracting surface 37b are in a positional relationship in which most of the first refracting surface 37b and the second refracting surface 37b are overlapped with each other in the Z-axis direction. Can be refracted by the second refracting surface 37b and converted into light parallel to the Z-axis direction.

The operation according to this embodiment will be described. Light emitted from the LED 24 toward the first light source sandwiching portion 27c in the light source arrangement area LA is incident on the light guide member 37 and then refracted by the first refracting surface 37a to be parallel to the X-axis direction. Directed to the non-arrangement region LN. The light propagating through the light guide member 37 and entering the light source non-arrangement region LN is refracted by the second refracting surface 37b, so that it is parallel to the Z-axis direction, that is, the second light source sandwiching portion 22c ( It proceeds to the second reflecting sheet 29) side. Thereby, the light existing in the light source arrangement area LA, which tends to have an excessive amount of light, can be distributed to the light source non-arrangement area LN where the light quantity tends to be insufficient, and thus the amount of light incident on the light incident surface 26b of the light guide plate 26. It becomes difficult to produce unevenness. In addition, when changing the arrangement | positioning space | interval between LED24, in the light guide member 37, by adjusting the relative positional relationship about the X-axis direction of the 1st refractive surface 37a and the 2nd refractive surface 37b suitably, It can be easily dealt with.

As described above, according to the present embodiment, the light directing portion 233 extends along the alignment direction of the LEDs 24 on the surface facing the LEDs 24 in at least one of the pair of light

source sandwiching portions

22c and 27c. The light guide member 37 is configured to guide the light from the first light-reflecting surface 37a that refracts the light from the LED 24 and directs it along the alignment direction of the LEDs 24, and the first light-reflecting surface 37a. A second refracting surface 37b is formed that further refracts the light refracted by the refracting surface 37a and directs the light to the side facing the light guide member 37 of the pair of light

source sandwiching portions

22c and 27c. In this way, the light from the LED 24 is refracted by the first refracting surface 37a and the second refracting surface 37b of the light guide member 37 that constitutes the light directing unit 233, so that the light is efficiently disposed in the non-arrangement pattern of the LED 24. Can be directed to the side.

<Embodiment 4>
A fourth embodiment of the present invention will be described with reference to FIG. In this Embodiment 4, what changed the formation range of the light directing part 333 from above-mentioned Embodiment 1 is shown. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

As shown in FIG. 15, the light directing portion 333 according to the present embodiment (the portion where the opening 328a is not formed in the lens portion 331 and the first reflection sheet 328) has a dimension W5 in the X-axis direction, that is, the LED 24 arrangement direction. Is the same size as the dimension W2 in the X-axis direction in the LED 24 and the light source arrangement area LA. On the other hand, the dimension W6 in the X-axis direction in the opening 328a of the first reflection sheet 328 is the same as the dimension W4 in the X-axis direction in the light source non-arrangement region LN. As described above, in the present embodiment, the light directing portion 333 is disposed over the entire light source arrangement region LA, whereas the opening 328a disposed between the adjacent light directing portions 333 is provided in the light source non-arrangement region LN. Distributed throughout.

<Embodiment 5>
A fifth embodiment of the present invention will be described with reference to FIG. In the fifth embodiment, a configuration in which the formation range of the light directing portion 433 is further changed from the above-described fourth embodiment is shown. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

As shown in FIG. 16, the light directing portion 433 according to the present embodiment (the portion where the opening portion 428a is not formed in the lens portion 431 and the first reflection sheet 428) has a dimension W7 in the X-axis direction, that is, the LED 24 arrangement direction. Is smaller than the dimension W2 in the X-axis direction in the LED 24 and the light source arrangement area LA. On the other hand, the dimension W8 in the X-axis direction in the opening 428a of the first reflection sheet 428 is larger than the dimension W4 in the X-axis direction in the light source non-arrangement region LN. As described above, in the present embodiment, the light directing unit 433 is arranged so as to overlap only a part of the light source arrangement region LA (the central part in the arrangement direction of the LEDs 24), whereas the adjacent light directing units 433 are arranged. The opening 428a disposed therebetween is disposed over the entire light source non-arrangement region LN.

<Embodiment 6>
Embodiment 6 of the present invention will be described with reference to FIG. In the sixth embodiment, the first reflective sheet 528 is changed from the first embodiment. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

The first reflection sheet 528 according to the present embodiment is configured such that the opening 28a described in the first embodiment is not formed, as shown in FIG. That is, the surface facing the LED 24 in the first light source sandwiching portion 527c according to the present embodiment is covered almost entirely by the first reflection sheet 528, and is not exposed to the LED 24 side. Therefore, also in the light source non-arrangement region LN, light can be efficiently reflected by the first reflection sheet 528 similarly to the light source arrangement region LA.

<Embodiment 7>
A seventh embodiment of the present invention will be described with reference to FIG. In the seventh embodiment, a light directing reflection portion 38 is provided instead of the first reflection sheet 28 from the first embodiment, and the lens-equipped sheet 32 is removed. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

As shown in FIG. 18, a light directing reflecting portion 38 is provided on the surface of the first light source sandwiching portion 627 c according to the present embodiment that faces the LED 24 as shown in FIG. The light directing reflecting portion 38 is made of a material having a white surface with excellent light reflectivity, and is integrally formed on the surface of the first light source sandwiching portion 627c facing the LED 24 by printing or the like. The light-directed reflecting section 38 has a cross-sectional shape cut along the X-axis direction to form a substantially triangular base, and has a convex shape with a central portion protruding toward the LED 24 in the X-axis direction. The light directing reflection portion 38 has a pair of inclined surfaces 38a facing the LED 24, and the pair of inclined surfaces 38a do not face the LED 24, and the adjacent light source non-arrangement region LN side in the X-axis direction. It is suitable. Therefore, the light traveling from the LED 24 toward the first light source sandwiching portion 627c is reflected by the inclined surface 38a of the light directing reflecting portion 38 disposed along the light source placement region LA, and is directed toward the light source non-placement region LN. Is done. Thereby, the light existing in the light source arrangement area LA, which tends to have an excessive amount of light, can be distributed to the light source non-arrangement area LN where the light quantity tends to be insufficient, and thus the amount of light incident on the light incident surface 26b of the light guide plate 26. It becomes difficult to produce unevenness. In addition, the specific shape of the light reflection surface in the light directing reflection unit 38 can be changed in addition to the inclined surface 38a, and for example, an arcuate surface or a curved surface can be used.

<Eighth embodiment>
An eighth embodiment of the present invention will be described with reference to FIG. In the eighth embodiment, a configuration in which the configuration of the light directing reflection unit 738 is changed from the above-described seventh embodiment. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

As shown in FIG. 19, the light-directing reflecting portion 738 according to the present embodiment is a concave shape whose central portion is retracted toward the first light source sandwiching portion 727c in the X-axis direction. Of the pair of inclined surfaces 738a included in the light-directing reflection unit 738, the right-side inclined surface 738a shown in FIG. 19 is not disposed adjacent to the left side of the same figure with respect to the light source arrangement region LA where the light-directing reflection unit 738 exists. In contrast to the region LN side, the inclined surface 738a on the left side of the figure faces the light source non-arrangement region LN side adjacent to the right side of the figure. Accordingly, the light traveling from the LED 24 toward the first light source sandwiching portion 727c is reflected by the inclined surface 738a of the light directing reflection portion 738 disposed along the light source arrangement region LA, and thus directed toward the light source non-arrangement region LN. Is done. In addition, the specific shape of the light reflecting surface in the light directing reflecting portion 738 can be changed in addition to the inclined surface 738a, and for example, an arcuate surface or a curved surface can be used.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In addition to the above-described embodiments, the arrangement order of the colored portions R, G, B, and Y in the color filter can be changed as appropriate. For example, as shown in FIG. The present invention includes an arrangement in which the colored portion B, the green colored portion G, the red colored portion R, and the yellow colored portion Y are arranged in this order along the X-axis direction.

(2) In addition to the above (1), for example, as shown in FIG. 21, the colored portions R, G, B, and Y in the color filter are red colored portions R and green colored portions G from the left side of the drawing. The present invention also includes an arrangement in which the yellow colored portion Y and the blue colored portion B are arranged in this order along the X-axis direction.

(3) In addition to the above (1) and (2), for example, as shown in FIG. 22, the colored portions R, G, B, and Y in the color filter are red colored portions R and yellow from the left side of the drawing. The present invention also includes an arrangement in which the colored portion Y, the green colored portion G, and the blue colored portion B are arranged in this order along the X-axis direction.

(4) In each of the above-described embodiments, the three primary colors of light, red (R), green (G), and blue (B) are added to yellow (Y) as the colored portion of the color filter. As shown in FIG. 23, a cyan colored portion C may be added instead of the yellow colored portion.

(5) In each of the above-described embodiments, the color filter has four colored portions. However, as shown in FIG. 24, the transparent color does not color transmitted light at the installation position of the yellow colored portion. The portion T may be provided. The transparent portion T has substantially the same transmittance for all wavelengths at least in the visible light, so that the transmitted light is not colored into a specific color.

(6) In each of the above-described embodiments, the four colored portions R, G, B, and Y constituting the color filter are illustrated as being arranged in the row direction. However, the four colored portions R are arranged. , G, B, and Y may be arranged in a matrix. Specifically, as shown in FIG. 25, the four colored portions R, G, B, and Y are arranged in a matrix with the X-axis direction as the row direction and the Y-axis direction as the column direction. Although the dimensions in the row direction (X-axis direction) in each of the colored portions R, G, B, and Y are all the same, the colored portions R, G, B, and Y arranged in adjacent rows are in the column direction (Y The dimensions in the axial direction are different from each other. In a row having a relatively large dimension in the column direction, the red colored portion R and the blue colored portion B are arranged adjacent to each other in the row direction, whereas the row having a relatively small size in the column direction. The green colored portion G and the yellow colored portion Y are arranged adjacent to each other in the row direction. In other words, the first colored row R and the blue colored portion B are alternately arranged in the row direction, the first row having a relatively large dimension in the column direction, the green colored portion G, and the yellow colored portion Y. Are alternately arranged in the row direction, and second rows having relatively small dimensions in the column direction are alternately arranged in the column direction. Thereby, the area of the red coloring part R and the blue coloring part B is made larger than the areas of the green coloring part G and the yellow coloring part Y. Further, the green colored portion G is arranged adjacent to the red colored portion R in the column direction, and the yellow colored portion Y is arranged adjacent to the blue colored portion B in the column direction. Yes.

As the color filter is configured as described above, in the array substrate, as shown in FIG. 26, the dimensions in the column direction of the pixel electrodes 115 arranged in adjacent rows are different. That is, the area of each pixel electrode 115 that overlaps with the red colored portion R or the blue colored portion B is larger than the area of the pixel electrode 115 that overlaps with the yellow colored portion Y or the green colored portion G. . The film thicknesses of the colored portions R, G, B, and Y are all equal. The source wirings 117 are all arranged at an equal pitch, while the gate wirings 116 are arranged at two different pitches according to the dimensions of the pixel electrodes 115 in the column direction. 25 and 26 show a case where the areas of the red colored portion R and the blue colored portion B are about 1.6 times the areas of the yellow colored portion Y and the green colored portion G. Show.

(7) As a further modification of the above (6), as shown in FIG. 27, the yellow colored portion Y is arranged adjacent to the red colored portion R in the column direction with respect to the color filter. It is also possible to adopt a configuration in which the green colored portion G is arranged adjacent to the colored portion B in the column direction.

(8) In each of the above-described embodiments, the color portions R, G, B, and Y constituting the color filter are illustrated with different area ratios. However, the areas of the colored portions R, G, B, and Y are exemplified. It is also possible to adopt a configuration in which the ratio is made equal. Specifically, as shown in FIG. 28, the colored portions R, G, B, and Y are arranged in a matrix with the X-axis direction as the row direction and the Y-axis direction as the column direction. The dimensions in the row direction (X-axis direction) in R, G, B, and Y are all the same, and the dimensions in the column direction (Y-axis direction) are all the same. Accordingly, the areas of the colored portions R, G, B, and Y are all equal. As the color filter is configured as described above, in the array substrate, as shown in FIG. 29, the dimension in the row direction of each pixel electrode 215 facing each colored portion R, G, B, Y is shown in FIG. Are all equal and the dimensions in the column direction are all equal, so that all the pixel electrodes 215 have the same shape and the same area. The gate wiring 216 and the source wiring 217 are all arranged at an equal pitch.

(9) In the above (8), the arrangement of the colored portions R, G, B, and Y can be the same as (1) to (3) described above.

(10) The configuration described in (4) or (5) above can also be applied to (6) and (8) above.

(11) In each of the above-described embodiments, the color filter has four colored portions. However, as shown in FIG. 30, the yellow colored portion is omitted, and red (R), which is the primary color of light. , Green (G), and blue (B) are also included in the present invention. In this case, it is preferable to make the area ratios of the colored portions R, G, and B equal.

(12) In each of the above-described embodiments, the structure related to the pixel has been described using the simplified drawings (FIGS. 4 and 5). However, in addition to the structure disclosed in these drawings, the specific structure related to the pixel is changed. Is possible. For example, the present invention can also be applied to a structure in which one pixel is divided into a plurality of sub-pixels and the sub-pixels are driven so as to have different gradation values, so-called multi-pixel driving is performed. Specifically, as shown in FIG. 31, one pixel PX is composed of a pair of sub-pixels SPX, and the pair of sub-pixels SPX is composed of a pair of adjacent pixel electrodes with the gate wiring 102 interposed therebetween. 100. On the other hand, a pair of TFTs 101 is formed on the gate wiring 102 corresponding to the pair of pixel electrodes 100. The TFT 101 includes a gate electrode 101a constituted by a part of the gate wiring 102, a source electrode 101b constituted by a pair of branch lines branched from the source wiring 103 and disposed on the gate electrode 101a, and the gate electrode 101a. And a drain electrode 101c arranged between the pair of source electrodes 101b, and arranged in the direction (Y-axis direction) of the pair of sub-pixels SPX forming one pixel PX on the gate wiring 102. A pair is lined up along. The drain electrode 101c of the TFT 101 is connected to the other end side of the drain wiring 104 having a contact portion 104a connected to the pixel electrode 100 on one end side. The contact portion 104a and the pixel electrode 100 are connected through a contact hole CH formed in an interlayer insulating film (not shown) interposed therebetween, and have the same potential. On the other hand, in the pair of pixel electrodes 100, the auxiliary capacitance wiring 105 is arranged at the end opposite to the gate wiring 102 side so as to overlap each other in plan view, and the pixel on which the auxiliary capacitance wiring 105 overlaps. A capacitance is formed with the electrode 100. That is, the pair of pixel electrodes 100 constituting one pixel PX forms a capacitance with different auxiliary capacitance lines 105. Further, between the gate wiring 101 and each auxiliary capacitance wiring 105, there is an in-pixel auxiliary capacitance wiring 108 which is parallel to the gate wiring 101 and auxiliary capacitance wiring 105 and crosses each pixel electrode 100 and each contact portion 104a. Each is formed. Each in-pixel auxiliary capacitance line 108 is connected to each auxiliary capacitance line 105 arranged on the side opposite to the gate line 101 side by a connection line 109, thereby having the same potential as each auxiliary capacitance line 105. ing. Accordingly, the in-pixel auxiliary capacitance line 108 having the same potential as that of the auxiliary capacitance line 105 is superimposed on the plane and forms a capacitance with each contact portion 104a having the same potential as each pixel electrode 100. In driving, the scanning signal and the data signal are supplied from the common gate wiring 102 and the source wiring 103 to the pair of TFTs 101, respectively, while the pair of pixel electrodes 100 and the pair of contact portions connected thereto. By supplying different signals (potentials) to each auxiliary capacitance line 105 and each pixel auxiliary capacitance line 108 that overlap each of 104a, the voltage value charged to each sub-pixel SPX, that is, the gradation value is different from each other. Can be made. Thereby, so-called multi-pixel driving can be performed, and good viewing angle characteristics can be obtained.

By the way, in the pixel structure that performs multi-pixel driving as described above, the coloring portions R, G, B, and Y of the color filter 106 that faces the pixel electrode 100 and the pixel electrode 100 are as follows. It is supposed to be configured. That is, as shown in FIG. 32, the color filter 106 includes four colored portions R, G, B, and Y. From the left side of the drawing, the yellow colored portion Y, the red colored portion R, and the green colored portion. G and blue colored portion B are repeatedly arranged in parallel along the X-axis direction in this order. Each of the colored portions R, G, B, and Y is partitioned by a light shielding layer (black matrix) 107. The light shielding layer 107 overlaps with the gate wiring 102, the source wiring 103, and the auxiliary capacitance wiring 105 in a plan view. Are arranged in a substantially lattice pattern. Among the colored portions R, G, B, and Y, the yellow colored portion Y and the green colored portion G have substantially the same dimensions in the X-axis direction (the parallel direction of the colored portions R, G, B, and Y). On the other hand, the red colored portion R and the blue colored portion B are relatively larger in dimensions in the X-axis direction than the yellow colored portion Y and the green colored portion G (for example, 1.3 times to 1). About 4 times). More specifically, the red colored portion R has a slightly larger dimension in the X-axis direction than the blue colored portion B. As shown in FIG. 31, the pixel electrodes 100 are approximately equal in size in the Y-axis direction, but the dimensions in the X-axis direction are the colored portions R, G, B of the color filter 106 facing each other. , Y corresponding to the size of Y.

(13) In each of the above-described embodiments, the light directing portion is arranged in the first light source sandwiching portion on the light emitting surface side out of the pair of light source sandwiching portions. A light directing unit may be arranged in the second light source sandwiching unit. Moreover, you may make it arrange | position a light directing part to both the 1st light source clamping part and the 2nd light source clamping part, respectively.

(14) In each of the above-described embodiments, the light directing unit is symmetric with respect to the LED arrangement direction, but the light directing unit is also asymmetric with respect to the LED arrangement direction. It is.

(15) In each of the above-described embodiments, the light directing unit is associated with all the light source arrangement regions, but the light directing unit is associated with only a part of each light source arrangement region. Those arranged in this manner are also included in the present invention. Specifically, it is possible to adopt a configuration in which the light directing units are arranged at unequal pitches in the LED arrangement direction.

(16) In each of the above-described embodiments, the light directing units have the same dimensions in the LED alignment direction. However, the present invention also includes light directing units having different dimensions in the LED alignment direction. include.

(17) Besides the first and second embodiments, the specific shape of the lens portion formed on the lens-attached sheet can be changed as appropriate. For example, the present invention includes a configuration in which the lens portion has a dot shape on the lens forming surface of the sheet base material. In that case, it is possible to two-dimensionally arrange the dot-shaped lens portions on the lens forming surface of the sheet base material.

(18) In each of the above-described embodiments, the case where the low light reflectance portion and the high light reflectance portion are formed by forming the opening in the first reflection sheet has been described. Even if the low light reflectivity part and the high light reflectivity part are formed by printing a high light reflectivity material with a high light reflectivity on the surface of the sheet base material having a light property at a position overlapping the lens part in plan view. I do not care. In that case, it is also possible to form the high light reflectance material by means such as coating or metal vapor deposition on a light-transmitting sheet base material.

(19) As a modification of the above (18), it is also possible to use a light-absorbing material excellent in light absorption for the sheet base material. As a light absorptive base material, the thing made from the synthetic resin whose surface exhibits black is preferable.

(20) In each of the above-described embodiments, the case where the low light reflectance portion and the high light reflectance portion are formed by forming the opening in the first reflection sheet has been described. The low light reflectance part and the high light reflectance part may be formed by printing the low light reflectance material on the surface of the first reflection sheet that does not have a part in a position where the lens part is not superimposed in plan view. . In that case, the low light reflectance material can be formed on the first reflective sheet by means such as coating or metal vapor deposition.

(21) In each of the above-described embodiments, the low light reflectance portion and the high light reflectance portion are configured by attaching the first reflection sheet to the first light source sandwiching portion. It is also possible to directly print or apply the high light reflectance material to the printed portion or the coated portion as a high light reflectance portion and to form the non-printed portion or the non-coated portion as a low light reflectance portion.

(22) In the configuration of (21), the low light reflectance part and the high light reflectance are provided in the second light source sandwiching part (part of the chassis) on the side opposite to the light emitting surface side of the pair of light source sandwiching parts. The present invention can be similarly applied when forming the portion.

(23) In each of the above-described embodiments, the case where the green phosphor that emits green light and the red phosphor that emits red light is used as the phosphor used in the LED is shown. For example, yellow that emits yellow light is used. What used the fluorescent substance independently is also contained in this invention. As the yellow phosphor, for example, α-SiAlON, which is a kind of SiAlON phosphor, is preferably used. In addition, it is also possible to use three types of phosphors by adding a yellow phosphor to a green phosphor and a red phosphor. Furthermore, it is possible to employ a configuration in which a green phosphor and a yellow phosphor are used and no red phosphor is used. In addition, the specific substance names of the phosphors of the respective colors can be appropriately changed other than those already described.

(24) In each of the above-described embodiments, an LED chip that emits blue light in a single color and a type of LED that emits substantially white light using a phosphor is used. The present invention includes an LED chip that incorporates an LED chip that emits ultraviolet light and that emits substantially white light using a phosphor. In this case, as the phosphor, it is preferable to use three colors: a blue phosphor that emits blue light, a green phosphor that emits green light, and a red phosphor that emits red light. The color of the phosphor can be changed as appropriate.

(25) In each of the above-described embodiments, an LED chip that emits blue light in a single color and a LED that emits substantially white light using a phosphor is used. However, red light, green light, and blue light are used. The present invention also includes an LED using a type of LED that incorporates three types of LED chips each emitting light in a single color. In addition, the present invention includes an LED using a type of LED in which three types of LED chips each emitting C (cyan), M (magenta), and Y (yellow) are monochromatic. In this case, the chromaticity of the LED can be adjusted by appropriately controlling the amount of current to each LED chip during lighting.

(26) In the above-described embodiments, the LED is used as the light source, but other light sources such as an organic EL can be used.

(27) In each of the embodiments described above, a TFT is used as a switching element of a liquid crystal display device. However, the present invention can also be applied to a liquid crystal display device using a switching element other than TFT (for example, a thin film diode (TFD)). In addition to the liquid crystal display device for display, the present invention can also be applied to a liquid crystal display device for monochrome display.

(28) In each of the above-described embodiments, the liquid crystal display device using the liquid crystal panel as the display panel has been exemplified, but the present invention can also be applied to a display device using another type of display panel.

(29) In each of the above-described embodiments, the television receiver provided with the tuner is exemplified, but the present invention is also applicable to a display device that does not include the tuner.

(30) In each of the embodiments described above, the light guide plate has a flat plate shape, and the light output surface and the opposite surface (surface facing the chassis) are used in parallel. For example, the light guide plate having a wedge shape in cross section and the light emitting surface and the opposite surface are not included in the present invention. In that case, the light exit surface of the light guide plate is parallel to the bottom plate of the chassis, whereas the surface opposite to the light exit surface of the light guide plate is inclined with respect to the bottom plate and the light exit surface. can do. In addition, the surface opposite to the light exit surface of the light guide plate is parallel to the bottom plate of the chassis, whereas the light exit surface of the light guide plate is opposite to the surface opposite to the bottom plate and the light exit surface. It is possible to adopt an inclined shape.

(31) In each of the above-described embodiments, a pair of LED substrates (LEDs) are arranged at the ends of both long sides of the light guide plate. For example, the LED substrates (LEDs) are both short sides of the light guide plate. What is arranged in a pair at the end of the side is also included in the present invention.

(32) In addition to the above (31), a pair of LED substrates (LEDs) arranged with respect to the ends of both long sides and short sides of the light guide plate, and conversely LED substrates (LEDs). The present invention includes one in which only one end of one long side or one short side of the light guide plate is disposed. In the configuration in which one LED substrate is disposed only on one long side or the end of one long side of the light guide plate, a light guide plate having a wedge-shaped cross section as described in (30) above is used. Is possible.

DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12 ... Backlight device (illumination device), 22 ... Chassis, 22c ... 1st light source clamping part (Light source sandwiching portion), 24 ... LED (light source), 26 ... light guide plate, 26a ... light emitting surface, 26b ... light incident surface, 27 ... frame (pressing member), 27c, 527c, 627c, 727c ... second light source sandwiching portion (light source sandwiching portion), 28, 328, 428, 528 ... first reflecting sheet (reflecting member), 28a, 328a, 428a ... opening, 29 ... 2nd reflection sheet (reflection member), 31, 131, 331, 431, ... lens part, 32, 132 ... sheet with lens, 33, 233, 333, 433 ... light directing part, 35 ... low light reflectance part, 36 ... high light reflectance part, 37 ... light guide member, 37a ... first refractive surface, 37b ... second refractive surface, 3 ... light directing reflecting portion (light directivity portion), (arrangement pattern of the light source) LA ... light source installation area, LN ... source blank region (non-arrangement pattern of the light source), TV ... television receiver apparatus

Claims

A plurality of light sources arranged intermittently side by side;
A surface that is parallel to the direction in which the light sources are arranged, is arranged in an opposing manner with a space between the light sources, and a light incident surface on which light from the light sources is incident, and emits the incident light A light guide plate having a light exit surface;
A pair of light source sandwiching portions arranged in a manner to sandwich the light source from the light emitting side of the light guide plate and the opposite side;
Light that is arranged following the arrangement pattern of the light source on the surface facing the light source in at least one of the pair of light source sandwiching portions, and that directs the light from the light source toward the non-arrangement pattern side of the light source A lighting device comprising a directivity unit.
The illuminating device according to claim 1, wherein the light directing unit is arranged over the entire area of the arrangement pattern of the light source on a surface facing the light source in at least one of the pair of light source sandwiching units.
The light directing portion is arranged in a range from the light source arrangement pattern to an end portion of the light source non-arrangement pattern on a surface facing the light source in at least one of the pair of light source sandwiching portions, The lighting device according to claim 2, wherein the light from the light source is directed toward the center of the non-arrangement pattern of the light source.
The lighting device according to any one of claims 1 to 3, wherein the light directing unit is disposed on a surface facing the light source in one of the pair of light source sandwiching units.
The illuminating device according to claim 4, wherein the light directing portion is arranged on a light emitting side of the pair of light source sandwiching portions with respect to the light source.
The lighting device according to any one of claims 1 to 5, wherein one of the pair of light source sandwiching portions is a pressing member that presses the light guide plate from a light emitting side.
The lighting device according to any one of claims 1 to 6, wherein one of the pair of light source sandwiching portions is a chassis that houses the light source and the light guide plate.
The light directing section is disposed on a surface facing the light source in at least one of the pair of light source sandwiching sections, and is disposed on a surface facing the light source in the reflecting member and from the light source. 8. The lens unit according to claim 1, further comprising: a lens unit configured to direct light toward the non-arrangement pattern side of the light source by refracting light of the light source and reflecting the light by the reflecting member. Lighting device.
The reflection member is formed with an opening that follows the non-arrangement pattern of the light source,
The light source sandwiching portion exposed through the opening portion constitutes a low light reflectance portion having a relatively low light reflectance, whereas the reflecting member constitutes a high light reflectance portion having a relatively high light reflectance. The lighting device according to claim 8.
The lighting device according to claim 8 or 9, wherein a sheet with a lens that extends along a direction in which the light sources are arranged and has the lens portion is disposed on a surface of the reflecting member that faces the light sources.
The light directing unit extends from a light guide member that guides light from the light source while extending along a direction in which the light sources are arranged on a surface facing the light source in at least one of the pair of light source sandwiching units. It is supposed to be
The light guide member has a first refracting surface that refracts light from the light source and directs the light along a direction in which the light sources are arranged, and further refracts light refracted by the first refracting surface. The lighting device according to any one of claims 1 to 7, wherein a second refracting surface that is directed toward a side facing the light guide member in the light source sandwiching portion is formed.
A display device comprising: the illumination device according to any one of claims 1 to 11; and a display panel that performs display using light from the illumination device.
13. The display device according to claim 12, wherein the display panel is a liquid crystal panel in which liquid crystal is sealed between a pair of substrates.
A television receiver comprising the display device according to claim 12 or 13.