WO2012128076A1 - Illumination device, display device, and television reception device - Google Patents

Illumination device, display device, and television reception device Download PDF

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Publication number
WO2012128076A1
WO2012128076A1 PCT/JP2012/056103 JP2012056103W WO2012128076A1 WO 2012128076 A1 WO2012128076 A1 WO 2012128076A1 JP 2012056103 W JP2012056103 W JP 2012056103W WO 2012128076 A1 WO2012128076 A1 WO 2012128076A1
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WO
WIPO (PCT)
Prior art keywords
light
surface
portion
side
light source
Prior art date
Application number
PCT/JP2012/056103
Other languages
French (fr)
Japanese (ja)
Inventor
良武 石元
Original Assignee
シャープ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2011061081 priority Critical
Priority to JP2011-061081 priority
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2012128076A1 publication Critical patent/WO2012128076A1/en

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Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0085Means for removing heat created by the light source from the package
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133615Edge-illuminating devices, i.e. illuminating from the side
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362Active matrix addressed cells
    • G02F1/13624Active matrix addressed cells having more than one switching element per pixel
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/52RGB geometrical arrangements

Abstract

This edge-lit backlight device (12) is provided with: a light guide plate (26) having a light entrance surface (26b) provided to the lateral surface thereof, and a light exit surface (26a) provided to one of the plate surfaces thereof; an LED (24) disposed facing the light entrance surface (26b) of the light guide plate (26); and an LED substrate (25) having a light source surface (25c), which is provided to one of the plate surfaces and at which the LED (24) is disposed, and a regulating section (25b), which protrudes from the light source surface (25c) more towards the light entrance surface (26b) than the LED (24) and regulates the distance between the LED (24) and the light entrance surface (26b). With the backlight device (12), it is possible to regulate the distance between an LED (24) and the light entrance surface (26b) of a light guide plate (26) using a regulating section (25b) that is a part of the LED substrate (25).

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, display elements of image display devices such as television receivers are shifting from conventional cathode ray tubes to thin display devices to which thin display elements such as liquid crystal panels and plasma display panels are applied. Is possible. The liquid crystal display device requires a backlight device as a separate illumination device because the liquid crystal panel used for this does not emit light.

As an example of such a backlight device, an edge light type backlight device in which a light incident surface is provided on a side surface of a light guide plate and a light source such as an LED is disposed on a side surface side of the light guide plate is known. In the edge light type backlight device, the light incident surface of the light guide plate may move to the light source side due to thermal expansion or the like, and the light source and the light incident surface of the light guide plate may come into contact with each other. When the light source contacts the light incident surface of the light guide plate, the light source may be damaged, and the luminance of the backlight device may be reduced.

Patent Document 1 discloses an edge light type backlight device in which the distance between an LED and a light incident surface of a light guide plate is regulated. The backlight device includes a liquid crystal display panel, a light guide plate, a light source unit provided with a light source, a frame that holds the liquid crystal display panel and the light guide plate, and a heat dissipation that supports the light source unit. And a board. The upper end of the heat radiating plate protrudes from the light source unit toward the light incident surface of the light guide plate, and the protruding portion faces the light incident surface of the light guide plate. For this reason, even when the light incident surface of the light guide plate moves to the light source side due to thermal expansion or the like, the distance between the light source unit and the light incident surface of the light guide plate is regulated by the protruding portion of the heat sink. The light source unit and the light incident surface of the light guide plate are prevented from coming into contact with each other.

JP 2010-9787 A

(Problems to be solved by the invention)
However, in the backlight device described in Patent Document 1, it is necessary to provide a separate heat sink in order to regulate the distance between the light source unit and the light incident surface of the light guide plate in the manufacturing process of the backlight device. There is. For this reason, the manufacturing process of a backlight apparatus may become complicated compared with the case where the member for controlling the distance between the light-incidence surfaces of a light-guide plate is not provided.

The present invention has been created in view of the above problems. An object of the present invention is to provide a technique capable of regulating a distance between a light source and a light incident surface of a light guide plate without providing a separate regulating member in an edge light type illumination device.

(Means for solving problems)
The present invention is a light guide plate having a light incident surface provided on a side surface and a light output surface provided on one plate surface, a light source disposed to face the light incident surface of the light guide plate, A light source surface provided on one plate surface, the light source surface on which the light source is disposed, and a restriction that projects from the light source surface to the light incident surface side than the light source and regulates a distance between the light source and the light incident surface And a light source substrate having a portion.

According to the above illumination device, even when the light guide plate expands to the light source side due to heat or the like, the distance between the light source and the light incident surface of the light guide plate using the restriction portion that is a part of the light source substrate Can be regulated. Thereby, it can prevent that a light source and the light-incidence surface of a light-guide plate contact | abut, and a light source is damaged. Therefore, the distance between the light source and the light incident surface of the light guide plate can be regulated without providing a separate regulating member, and the manufacturing process of the lighting device can be prevented from becoming complicated.

The tip of the restricting portion may abut on the light incident surface.
According to this configuration, even when the light guide plate expands toward the light source due to heat or the like, the distance between the light source and the light incident surface of the light guide plate can be kept constant, and the optical design of the lighting device is maintained. can do. In addition, since the restricting portion comes into contact with the light guide plate in this way, the light guide plate can be positioned by the restricting portion in the housing member. In addition, the shape of the front-end | tip of a control part is not limited. For example, the tip of the restricting portion may be chamfered. In this case, it is possible to prevent or suppress the light incident surface of the light guide plate from being damaged by the tip of the restricting portion as compared with the case where the tip of the restricting portion is pointed.

In the light source substrate, an angle formed between the light source surface and a surface exposed to the light source side of the restricting portion may be 90 ° or more.
According to this configuration, the light emitted from the light source and traveling toward the light incident surface is not easily blocked by the restricting portion, so that the light incident efficiency of the light emitted from the light source toward the light incident surface by the restricting portion is prevented from decreasing. Or can be suppressed.

A reflecting member may be disposed on a surface of the restricting portion exposed to the light source.
According to this configuration, since the light directed from the light source toward the restricting portion can be reflected by the reflecting member toward the light incident surface, the light incident efficiency of the light from the light source with respect to the light incident surface of the light guide plate can be increased. .

Disposed on the light exit surface side of the light guide plate, an optical sheet having a covering portion covering the said output light surface, and a light incident surface side toward said light source side extending extending from the cover portion portions, the A bottom plate and a side plate that rises on one surface side of the bottom plate, and has a light output portion on the one surface side, and contains at least the light guide plate, the light source, the light source substrate, and the optical sheet. And the light guide plate is arranged such that the light exit surface faces the light exit portion side of the housing member, and the restricting portion is on the light exit portion side of the housing member of the light source surface. The surface of the light source substrate that faces the light exit portion of the housing member of the restricting portion is in the thickness direction of the light guide plate, and the light source substrate has the surface of the extension portion of the optical sheet. The bottom plate side relative to the surface directed to the light exit surface side It may be arranged such that the height position.
According to this configuration, at least a part of the light exiting portion side of the housing member is covered by the extending portion between the light incident surface and the restricting portion, so that the light emitted from the light source is on the light exiting portion side of the housing member Can be prevented or suppressed from leaking to the outside. Further, the restricting portion protrudes from the end portion on the light exiting portion side of the housing member of the light source surface, and the surface directed toward the light exiting portion side of the accommodating member of the restricting portion is more than the surface directed to the light exiting surface side of the optical sheet. since there is a height located at the bottom plate side, even when the extending portion of the optical sheet by heat or the like during the lighting of the light source is expanded to the light source substrate, the extended portion edge of abuts against the tip of the restricting portion Can be prevented or suppressed. For this reason, it can prevent thru | or suppress that an optical sheet abuts on a control part and bends. In the present invention, the “cover” does not mean anything that blocks light. Further, the above-mentioned “height positioned on the bottom plate side relative to the light-emitting surface side of the extending portion of the optical sheet in the thickness direction of the light guide plate” means the light-emitting portion side of the regulating portion It includes a relationship in which the extension part is placed on the surface directed to.

The extending portion of the optical sheet may extend to a position overlapping the restricting portion in the thickness direction of the light guide plate.
According to this configuration, since the light emitting part side of the housing member is covered by the extending part between the light incident surface and the restricting part, it is further prevented that the light emitted from the light source leaks from the light emitting part side of the housing member to the outside. It can be surely prevented. Moreover, even if the extension portion expands toward the restriction portion, the end side of the extension portion does not come into contact with the restriction portion, so that the optical sheet can be prevented from being bent due to contact with the restriction portion. .

The distal end portion of the extending portion may be in contact with the surface on the light exiting portion side of the housing member of the restricting portion.
According to this configuration, since the light exiting portion side of the housing member is completely covered by the extending portion between the light incident surface and the restricting portion, the light emitted from the light source is emitted from the light exiting portion side of the housing member to the outside. And can prevent leakage.

A support plate bottom plate supported by the bottom plate of the housing member, a surface rising from one end edge of the support plate bottom plate toward the light-emitting portion side of the housing member, and a surface opposite to the light source surface of the light source substrate A support plate having a support plate side plate to be supported may be further provided.
According to this configuration, it is possible to realize a mode in which the light source substrate is suitably supported on the bottom plate by the support plate.

The support plate side plate of the support plate has a tip surface on the light output portion side of the housing member that is directed to the light output surface side of the extension portion of the optical sheet in the thickness direction of the light guide plate. May rise up to a height relatively positioned on the bottom plate side.
According to this configuration, even when the extension portion of the optical sheet expands toward the light source substrate due to heat or the like when the light source is turned on, it can be prevented or suppressed that the edge of the extension portion contacts the support plate. It can prevent or suppress that an optical sheet bends by contact | abutting with a support plate.

The support plate bottom plate of the support plate extends to a position facing the opposite surface of the light guide plate opposite to the light exit surface, and the extending portion of the support plate bottom plate extends to the opposite surface side. And a light guide plate support part for supporting the light guide plate.
According to this configuration, since the thickness of the light guide plate can be reduced by the height of the contact portion, the manufacturing cost of the light guide plate can be reduced.

The support plate may have heat dissipation properties.
According to this configuration, the heat generated in the light source substrate can be effectively radiated by the heat radiating plate support plate. Furthermore, since the support plate heat sink is fixed by the support plate heat sink bottom plate being supported by the bottom plate of the housing member, the heat propagation efficiency is higher than when the support plate heat sink is movable. The heat dissipation effect by the support plate heat sink can be enhanced.

The light source may be arranged so as to be unevenly distributed on the light output part side of the housing member with respect to the center position of the light source substrate in the thickness direction of the light guide plate.
According to this configuration, since the light source can be arranged at the same height as the center position of the light incident surface in the thickness direction of the light guide plate, it is emitted from the light source even when the thickness of the light guide plate is reduced as described above. It is possible to prevent the light incident efficiency of the incident light from entering the light incident surface.

The present invention can also be expressed as a display device that includes a display panel that performs display using light from the lighting device. A display device in which the display panel is a liquid crystal panel using liquid crystal is also new and useful. A television receiver provided with the above display device is also new and useful.

(The invention's effect)
According to the technology disclosed in this specification, in the edge light type illumination device, the distance between the light source and the light incident surface of the light guide plate can be regulated without providing a separate regulating member.

1 is an exploded perspective view of a television receiver TV according to Embodiment 1. FIG. An exploded perspective view of the liquid crystal display device 10 is shown. A cross-sectional view along the long side direction of the liquid crystal panel 11 is shown. An enlarged plan view of the array substrate 11b is shown. An enlarged plan view of the CF substrate 11a is shown. FIG. 2 shows a cross-sectional view of the liquid crystal display device 10 along the short side direction. FIG. 2 shows an enlarged cross-sectional view of a main part of the liquid crystal display device 10. FIG. 4 is an enlarged cross-sectional view of a main part of a liquid crystal display device 110 according to Embodiment 2. FIG. 6 is an enlarged cross-sectional view of a main part of a liquid crystal display device 210 according to Embodiment 3. FIG. 6 shows an enlarged cross-sectional view of a main part of a liquid crystal display device 310 according to a fourth embodiment. FIG. 6 shows an enlarged cross-sectional view of a main part of a liquid crystal display device 410 according to a fifth embodiment. FIG. 7 shows an enlarged cross-sectional view of a main part of a liquid crystal display device 510 according to a sixth embodiment. An enlarged plan view of a CF substrate according to Modification 1 is shown. An enlarged plan view of a CF substrate according to Modification 2 is shown. An enlarged plan view of a CF substrate according to Example 3 is shown. An enlarged plan view of a CF substrate according to modification 4 is shown. An enlarged plan view of a CF substrate according to Modification 5 is shown. An enlarged plan view of a CF substrate according to Modification 6 is shown. An enlarged plan view of an array substrate according to Modification 6 is shown. An enlarged plan view of a CF substrate according to Modification 7 is shown. An enlarged plan view of a CF substrate according to Modification 8 is shown. An enlarged plan view of an array substrate according to Modification 8 is shown. An enlarged plan view of a CF substrate according to Modification 9 is shown. An enlarged plan view of an array substrate according to Modification 10 is shown. An enlarged plan view of a CF substrate according to Modification 10 is shown.

<Embodiment 1>
Embodiment 1 will be described with reference to the drawings. 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.2 and FIG.3 be a front side, and let the lower side of the figure be a back side.

(TV receiver)
As shown in FIG. 1, a television receiver TV according to this embodiment includes a liquid crystal display device (an example of a display device) 10 that is a display device, and front and back cabinets Ca and Cb that are accommodated with the liquid crystal display device 10 interposed therebetween. A power supply circuit board P for supplying power, a tuner (receiving unit) T capable of receiving a television image signal, and a television image signal output from the tuner T is converted into an image signal for the liquid crystal display device 10. An image conversion circuit board VC and a stand S are provided.

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 matched state. 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 (an example of a lighting device) 12 that is an external light source, and these are constituted by a frame-like bezel 13 or the like. It is designed to be held together.

(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) square 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, and is either ITO (Indium Tin Oxide) or ZnO. 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, 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, as shown in FIG. 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). Crimp connection is made through ACF (Anisotropic Conductive Film), and the driver components for driving the liquid crystal are electrically connected to a display control circuit board (not shown) through 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 based on an output signal from the image change circuit board VC, each wiring 16, 17 is connected via a driver component. 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 each pixel 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 portions R, G, B, Y, likewise the long side direction in the Y-axis direction and the pixel electrode 15, the shape towards the longitudinal the short side direction respectively is aligned with the X-axis direction (longitudinal) (rectangular) 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, the counter electrode 20 and the 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 a relatively large size in the row direction and the colored portions G and Y having a relatively small size 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 illustrate 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, the liquid crystal display device 10 according to the present embodiment uses the liquid crystal panel 11 including the color filter 19 composed of 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 TV 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 is arranged so as to cover a substantially box-shaped chassis 22 having a light output part 22d on the light output surface side (liquid crystal panel 11 side), and a light output part 22d of the chassis 22. The optical sheet 23 is provided. Further, in the chassis 22, the light source LED 24, the LED board 25 on which the LED 24 is mounted, the heat radiation plate 33 that supports the LED board 25, and the light from the LED 24 are guided to the optical sheet 23 (liquid crystal panel). 11) and a frame 27 for holding the light guide plate 26 from the front side. 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. 2 and 6, 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, nearly box shape that opens toward the front. 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 sheet)
As shown in FIG. 2, the optical sheet 23 has a horizontally long rectangular shape in a plan view, like the liquid crystal panel 11 and the chassis 22, and has a thin sheet shape. The optical sheet 23 is placed on the front side (light emitting side) of the light guide plate 26 and is disposed between the liquid crystal panel 11 and the light guide plate 26. The optical sheet 23 is formed by laminating a diffusion sheet 23a, a lens sheet 23b, and a reflective polarizing plate 23c in order from the light guide plate 26 side. The diffusion sheet 23a, the lens sheet 23b, and the reflective polarizing plate 23c have a function of converting light emitted from the LED 24 and passing through the light guide plate 26 into planar light.

(flame)
As shown in FIG. 2, the frame 27 is formed in a frame shape (frame shape) extending along the outer peripheral end portion of the light guide plate 26, and the outer peripheral end portion of the light guide plate 26 extends from the front side over substantially the entire circumference. It is possible to hold down. The frame 27 is made of a synthetic resin and has a light guide property by having a surface with, for example, a black color. Further, the frame 27 can receive the outer peripheral end of the liquid crystal panel 11 from the back side.

(LED)
As shown in FIG. 6, the LED 24 is a so-called top type that is mounted on the LED substrate 25 and has a light emitting surface on the surface opposite to the mounting surface with respect to the LED 24. On the light emitting surface side of the LED 24, a lens member (not shown) is provided for emitting light while diffusing it in a wide angle. The lens member is interposed between the LED 24 and the light incident surface 26b of the light guide plate 26, and has a light emitting surface that is convex toward the light guide plate 26 side. Further, the light emitting surface of the lens member is curved along the longitudinal direction of the light incident surface 26b of the light guide plate 26, and the cross-sectional shape is a substantially arc shape.

The LED 24 includes an LED chip (not shown) that emits blue light as a light source, and also 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, it is preferable to use β-SiAlON which is a kind of sialon phosphor. 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 phosphor, which is a nitride, has excellent luminous efficiency and durability compared to other phosphors made of, for example, sulfide or oxide. 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. Rare earth elements (for example, Tb, Yg, Ag, etc.) as activators are used for sialon phosphors. Β-SiAlON, which is a kind of sialon-based phosphor, has a general formula Si6-ZAlZOZN: Eu (z indicates a solid solution amount) or (Si, Al) 6 in which aluminum and oxygen are dissolved in β-type silicon nitride crystal. (O, N) 6: 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 fluorescent 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 cadmium-based 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 FIG. 2, the LED substrate 25 extends 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), and the main plate surface extends in the X-axis direction. And it is accommodated in the chassis 22 in a posture parallel to 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 sheet 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 light source surface (opposite surface facing the light guide plate 26) 25c facing the inner side, that is, the light guide plate 26 side, which is the main plate surface of the LED substrate 25. A plurality of LEDs 24 are arranged in a line (linearly) in parallel along the length direction (X-axis direction) on the light source surface 25 c of the LED substrate 25. Therefore, it can be said that a plurality of LEDs 24 are arranged in parallel along the long side direction at both ends on the long side of the backlight device 12. Since the pair of LED boards 25 are housed in the chassis 22 in such a manner that the light source faces (mounting faces of the LEDs 24) 25c face each other, the light emitting faces of the LEDs 24 respectively mounted on the LED boards 25 face each other. In addition, 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.

(Heatsink)
The heat radiating plate 33 is made of metal having excellent heat radiating properties, and has a substantially L shape when viewed in cross section as shown in FIG. As shown in FIG. 7, the radiator plate 33 includes a radiator plate bottom plate (an example of a support plate bottom plate) 33a fixed to the bottom plate 22a of the chassis 22, and one edge of the radiator plate bottom plate 33a (chassis side plate 22b, And a heat sink side plate (an example of a support plate side plate) 33b that rises to the front side from an edge near 22c. A reflection sheet 29 described later is laid on a part of the heat sink plate 33a on the plate surface. Further, the inner (light guide plate 26 side) plate surface of the heat radiating plate side plate 33b is a support surface 33b2, and supports the surface of the LED substrate 25 opposite to the light source surface 25b.

(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 FIG. 2, the light guide plate 26 has a horizontally long rectangular shape as viewed in a plane 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 is the Y axis. Each direction matches. As shown in FIG. 6, the light guide plate 26 is disposed in the chassis 22 and directly below the liquid crystal panel 11 and the optical sheet 23, and a pair of LED substrates disposed at both ends on the long side of the chassis 22. 25 are arranged so as to be sandwiched between them in the Y-axis direction. Accordingly, 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 sheet 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 sheet 23 (Z-axis direction) while propagating the light inside. Have. The light guide plate 26 is formed to be slightly larger than the optical sheet 23 described above, and its outer peripheral end projects outward from the outer peripheral end of the optical sheet 23 and is pressed by the frame 27 described above. (See FIGS. 6 and 7).

The light guide plate 26, as shown in FIGS. 2 and 6, has a substantially flat plate extending along each plate surface of the bottom plate 22a and the optical sheet 23 of the chassis 22, the main plate surface X-axis direction and 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 sheet 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, which are long along the X-axis direction, are opposed to the LED 24 (LED substrate 25) with a predetermined space therebetween. These are the light incident surface 26b on which the light emitted from the LED 24 is incident. The light incident surface 26b is a surface parallel to the X axis direction and the Z axis direction, and is a surface substantially orthogonal to the light exit surface 26a. 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 exit surface 26a. On the opposite surface 26c of the light guide plate 26 opposite to the light exit surface 26a, a reflection sheet 29 capable of reflecting the light in the light guide plate 26 and raising it to the front side is provided so as to cover the entire area. . Note that at least one of the light exit surface 26a and the opposite surface 26c on the opposite side of the light guide plate 26 is a reflection portion (not shown) that reflects internal light or a scattering portion (not shown) that scatters 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 on the liquid crystal panel 11 tends to be yellowish as a whole. To avoid this, in the backlight device 12 according to the present embodiment, so that chromaticity of LED24 are adjusted in blue slightly and the complementary color of yellow, thereby correcting the chromaticity of the displayed 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.

In adjusting the chromaticity of LED24 as described above, the closer the chromaticity from white to blue, it tends to luminance of the emitted light is reduced has been found by the study of the present inventors. Therefore, in the present embodiment, so as to relatively larger than the colored portion Y of the colored portion G and yellow area ratio green blue colored portion B constituting the color filter 19, thereby 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, so as to relatively larger than the colored portion Y of the colored portion G and yellow area ratio green colored portion R of the red constituting the color filter 19, thereby the color filter The transmitted light of 19 can contain a larger amount of red, and therefore, 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)
Then, the structure of the LED board 25 which is the principal part of this embodiment is demonstrated. At the upper end of the LED substrate 25, as shown in FIG. 7, a restricting portion 25b that protrudes from the light source surface 25c to the light incident surface 26b side of the light guide plate 26 from the LED 24 is provided. The restricting portion 25 b is integrally formed with the plate surface of the LED substrate 25, and extends so that its tip is located between the light incident surface 26 b of the light guide plate 26 of the LED 24. The front end of the restricting portion 25b is flat along the light incident surface 26b of the light guide plate 26. By such a restriction portion 25b is provided, even light incident surface 26b of the light guide plate 26 due to thermal expansion or the like is moved to LED24 side, a light incident surface 26b of the LED24 and the light guide plate 26 by the regulating portion 25b And the light incident surface 26b of the light guide plate 26 is prevented from coming into contact with the LED 24.

As described above, in the backlight device 12 according to the present embodiment, even when the light guide plate 26 expands toward the LED 24 due to heat or the like, the LED 24 and the LED 24 can be used by using the regulating portion 25b that is a part of the LED substrate 25. The distance from the light incident surface 26b of the light guide plate 26 can be regulated. Thereby, it can prevent that LED24 and the light-incidence surface 26b of the light-guide plate 26 contact | abut, and LED24 is damaged. For this reason, the distance between the LED 24 and the light incident surface 26b of the light guide plate 26 can be regulated without providing a separate regulating member, and the manufacturing process of the backlight device 12 can be prevented from becoming complicated. it can. Further, the restricting portion 25b can prevent the light incident surface 26b of the light guide plate 26 from coming into contact with the LED 24 and damaging the LED 24.

In addition, the LED board 25 provided with the restriction part 25b as described above is easy to integrally form the plate surface of the LED board 25 and the restriction part 25b, and can be manufactured in advance. When manufacturing the backlight device 12 in which the distance from the light incident surface 26b of the optical plate 26 is restricted, it is possible to suppress an increase in manufacturing cost.

In addition, the backlight device 12 according to the present embodiment rises from the one end edge of the heat radiating plate bottom plate 33a supported by the bottom plate 22a of the chassis 22 to the light emitting portion side (front side) of the chassis 22 from one end edge of the heat radiating plate bottom plate 33a. A heat radiating plate 33 having a heat radiating plate side plate 33b that supports the surface of the LED substrate 25 opposite to the light source surface 25c is further provided. For this reason, the aspect by which the LED board 25 was suitably supported by the baseplate with the heat sink 33 is realizable. Further, the heat generated in the LED substrate 25 can be effectively radiated by the heat radiating plate 33. Furthermore, since the heat radiating plate 33 is fixed by the heat radiating plate bottom plate 33a being supported on the bottom plate 22a of the chassis 22, the heat propagation efficiency is higher than when the heat radiating plate 33 is movable, and the heat radiating plate 33a is supported. The heat dissipation effect by the plate 33 can be enhanced.

<Embodiment 2>
A second embodiment will be described with reference to the drawings. The second embodiment is different from the first embodiment in the configuration of the restricting portion. Since the other configuration is the same as that of the first embodiment, the description of the structure, operation, and effect is omitted. In FIG. 8, the part obtained by adding the numeral 100 to the reference numeral in FIG. 7 is the same as the part described in the first embodiment.

In the backlight device 112 according to the second embodiment, as illustrated in FIG. 8, the restricting portion 125 b extends until the tip thereof contacts the light incident surface 126 b of the light guide plate 126. With such a configuration, the distance between the LED 124 and the light incident surface 126b of the light guide plate 126 is restricted by the restricting portion 125b. For this reason, even when the light guide plate 126 expands toward the LED 124 due to heat or the like, the distance between the LED 124 and the light incident surface 126b of the light guide plate 126 can be kept constant, and the optical characteristics of the backlight device 112 can be maintained. The design can be maintained. In addition, the restricting portion 125b contacts the light guide plate 126b as described above, whereby the light guide plate 126 can be positioned by the restricting portion 125b in the chassis 122.

Further, in the backlight device 112 according to the second embodiment, as illustrated in FIG. 8, the reflecting member 135 is disposed on the surface (back surface) exposed to the LED 124 side of the restricting portion 125b. Therefore, the light directed from the LED 124 toward the restricting portion 125b can be reflected by the reflecting member 135 toward the light incident surface 126b, and the light incident efficiency of the light from the LED 124 with respect to the light incident surface 126b of the light guide plate 126 can be improved. Can do.

<Embodiment 3>
Embodiment 3 will be described with reference to the drawings. The third embodiment is different from the second embodiment in the configuration of the restricting portion 225b. Since other configurations are the same as those of the second embodiment, description of the structure, operation, and effect is omitted. In FIG. 9, the part obtained by adding the numeral 200 to the reference numeral in FIG. 7 is the same as the part described in the first embodiment.

In the backlight device 212 according to the third embodiment, as shown in FIG. 9, the front end of the restricting portion 225 b is in contact with the light incident surface 226 b of the light guide plate 226 and the front end thereof is chamfered. For this reason, it is possible to prevent or suppress the light incident surface 226b of the light guide plate 226 from being damaged by the tip of the restricting portion 225b as compared with the case where the tip of the restricting portion 225b is pointed.

<Embodiment 4>
Embodiment 4 will be described with reference to the drawings. In the fourth embodiment, the configuration of the restricting portion 325b is different from that of the third embodiment. Since other configurations are the same as those of the third embodiment, description of the structure, operation, and effect is omitted. In FIG. 10, a part obtained by adding the numeral 300 to the reference numeral in FIG. 7 is the same as the part described in the first embodiment.

In the backlight device 312 according to the fourth embodiment, as illustrated in FIG. 10, the restriction portion 325b extends obliquely upward from the light source surface 325c toward the light incident surface 326b at the upper end of the LED substrate 325. As in the second and third embodiments, the tip is in contact with the light incident surface 326 b of the light guide plate 326. Specifically, in the LED substrate 325, the restricting portion 325b is incident with the angle θ formed by the light source surface 325c and the surface (back surface) exposed to the LED 324 side of the restricting portion 325b being greater than 90 °. It extends to the surface 326b side.

In the backlight device, when the angle θ is smaller than 90 °, a part of the light emitted from the LED 324 toward the light incident surface 326b is blocked by the restricting portion 325b, so that the light emitted from the LED 324 The light entrance efficiency to the light guide plate 326 is reduced. According to the backlight device 312 according to the fourth embodiment, the angle θ described above is larger than 90 °, so that the light emitted from the LED 324 and directed to the light incident surface 326b is not easily blocked by the restricting unit 325b. It can be prevented or suppressed that the light incident efficiency of the light emitted from the LED 324 and directed toward the light incident surface 326b by the restricting portion 325b is lowered.

<Embodiment 5>
Embodiment 5 will be described with reference to the drawings. In the fifth embodiment, the configuration of the optical sheet 423 is different from that of the first embodiment. Since the other configuration is the same as that of the first embodiment, the description of the structure, operation, and effect is omitted. In FIG. 11, the part obtained by adding the numeral 400 to the reference sign in FIG. 7 is the same as the part described in the first embodiment.

In the backlight device 412 according to the fifth embodiment, as illustrated in FIG. 11, the optical sheet 423 includes a cover portion 423 d that covers the light exit surface 426 a and the light guide plate 426 from the light incident surface 426 b side toward the LED 424 side. And an extension part 423e extending from the part 423d. It should be noted that the “cover” in this specification does not mean anything that blocks light. Of the three sheets 423a, 423b, and 423c constituting the optical sheet 423, the tip of the extension portion 423e of the diffusion sheet 423a disposed on the side closest to the light exit surface 426a of the light guide plate 426 is the LED substrate 425. It extends to a position overlapping with the regulating portion 425b, and is in contact with the surface of the regulating portion 425b facing the light output portion side (front side) of the chassis 422.

Moreover, in the heat sink 433, the heat sink side end surface 433b1 which is a surface facing the light emission part side (front side) of the chassis 422 in the heat sink side plate 433b is the surface of the light guide plate 426 of the extension part 423e of the diffusion sheet 423a. The height is slightly positioned on the bottom plate 422a side of the chassis 422 from the surface (back surface) directed toward the light exit surface 426a. Since the backlight device 412 is configured as described above, even when the extended portion 423e of the optical sheet 423 expands to the side plate 422b side of the chassis 422 due to heat or the like, the tip of the extended portion 423e is already present. Since it is located on the restricting portion 425b of the LED substrate 425, the optical sheet 423 is prevented from being bent by the tip of the extending portion 423e coming into contact with the tip of the restricting portion 425b. Furthermore, since the heat sink side end surface 433b1 of the heat sink 433 has the above-described height, even when the extended portion 423e of the optical sheet 423 expands toward the side plate 422b of the chassis 422 due to heat or the like, It is prevented that the optical sheet 423 is bent by the tip of the protruding portion 423e coming into contact with the heat radiating plate 433.

<Embodiment 6>
Embodiment 6 will be described with reference to the drawings. In the sixth embodiment, the configuration of the heat sink 533 is different from that of the first embodiment. Since the other configuration is the same as that of the first embodiment, the description of the structure, operation, and effect is omitted. In FIG. 12, the part obtained by adding the numeral 500 to the reference sign in FIG. 7 is the same as the part described in the first embodiment.

In the backlight device 512 according to the sixth embodiment, a light guide plate support 533 c that protrudes to the opposite surface 526 c side of the light guide plate 526 is provided in a portion of the heat sink plate 533 a that overlaps the light guide plate 526. Yes. The front end of the light guide plate support portion 533c is in contact with the back surface of the reflection sheet 529, and the light guide plate 526 is supported by the light guide plate support portion 533c. For this reason, the thickness of the light guide plate 526 is smaller than that of the first embodiment by the height of the light guide plate support portion 533c. For this reason, the manufacturing cost of the light guide plate 526 can be reduced as compared with the configuration of the first embodiment.

Further, as the thickness of the light guide plate 526 is reduced, the center position in the thickness direction of the light guide plate 526 on the light incident surface 526b of the light guide plate 526 is larger than that of the first embodiment compared to that of the first embodiment. It is shifted to the side (front side, optical sheet 523 side). On the other hand, the LEDs 524 are arranged unevenly on the light output part side (front side, optical sheet 523 side) of the chassis 522 from the center position of the LED substrate 525 in the thickness direction of the light guide plate 526. Thereby, the position of the LED 524 in the thickness direction of the light guide plate 526 is the same height as the center position of the light incident surface 526b of the light guide plate 526 described above. For this reason, the light emitted from the LED 524 enters the light incident surface 526b of the light guide plate 526 with high light incident efficiency. As described above, in the backlight device 512 according to the sixth embodiment, the LED 524 is disposed at the same height as the center position of the light incident surface 526b of the light guide plate 526 even when the light guide plate 526 is thin. Therefore, the light incident efficiency to the light incident surface 526b of the light emitted from the LED 524 is prevented from decreasing while the distance between the LED 524 and the light incident surface 526b of the light guide plate 526 is restricted by the restricting portion 525b. can do.

The modifications of the above embodiments are listed below.
(1) In each of the above embodiments, the configuration in which the restricting portion extends from the light source surface at the upper end of the LED substrate is illustrated, but the location that becomes the starting point of the restricting portion may be any location on the light source surface. . For example, the structure which the control part is extended from the light source surface under LED may be sufficient. Even in such a configuration, the distance between the LED and the light incident surface of the light guide plate can be regulated by the regulating unit.

(2) In each of the embodiments described above, the backlight device includes a heat dissipation plate, but the LED substrate has exemplified the configuration that is supported by the supporting surface of the heat radiating plate side plate, a backlight device is not provided with the heat dissipation plate It is good also as a structure. In this case, it is good also as a structure by which the surface on the opposite side to the light source surface of an LED board was supported by the side plate of the chassis.

(3) In addition to the above-described embodiments, the length that the restricting portion extends, the thickness of the restricting portion, the shape of the tip of the restricting portion, and the like can be changed as appropriate.

(4) Besides 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. 13, the blue colored portion B, the green colored portion G, the red colored portion R, and the yellow colored portion Y are arranged in this order from the left side in the X-axis direction. There may be.

(5) In addition to the form (4), for example, as shown in FIG. 14, the colored portions R, G, B, and Y in the color filter are red colored portions R and green colored portions from the left side of the drawing. The arrangement may be such that G, yellow colored portion Y, and blue colored portion B are arranged in this order along the X-axis direction.

(6) In addition to the forms (4) and (5), for example, as shown in FIG. 15, the colored portions R, G, B, and Y in the color filter are red colored portions R, The arrangement may be such that the yellow colored portion Y, the green colored portion G, and the blue colored portion B are arranged in this order along the X-axis direction.

(7) 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. 16, a cyan colored portion C may be added instead of the yellow colored portion.

(8) In the above-described embodiments, the color filter has four colored portions. However, as shown in FIG. 17, the transparent color that does not color transmitted light at the yellow colored portion installation position. 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.

(9) 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. 18, 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. That is, the red colored portion R and the blue colored portion B are alternately arranged in the row direction, and the second row and the column direction are relatively alternately arranged in the column direction. Become. 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, the dimensions in the column direction of the pixel electrodes arranged in adjacent rows are different as shown in FIG. That is, the area of each pixel electrode that overlaps with the red colored portion R or the blue colored portion B is larger than the area of the pixel electrode 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 are all arranged at an equal pitch, while the gate wirings are arranged at two pitches according to the dimensions of the pixel electrodes in the column direction. 18 and 19 illustrate 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.

(10) As a further modification of the above (9), as shown in FIG. 20, 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.

(11) 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. 21, 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. With the configuration of the color filter as described above, in the array substrate, as shown in FIG. 22, the dimension in the row direction of each pixel electrode facing each colored portion R, G, B, Y is as follows. All are equal and all the dimensions in the column direction are equal, so that all the pixel electrodes have the same shape and the same area. The gate wiring and the source wiring are all arranged at an equal pitch.

(12) In the above (11), the arrangement of the colored portions R, G, B, and Y can be made the same as in the above (4) to (6).

(13) The configuration described in (7) or (8) can be applied to (9) and (11).

(14) In the above-described embodiments, the color filter has four colored portions. However, as shown in FIG. 23, the yellow colored portion is omitted, and red (R), which is the primary color of light. , Green (G), and blue (B) only. In this case, it is preferable to make the area ratios of the colored portions R, G, and B equal.

(15) In each of the above-described embodiments, the structure related to the pixel has been described using the simplified drawings (FIGS. 4 and 5), but the specific structure related to the pixel is changed in addition to the structure disclosed in these drawings. 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. 24, 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 subpixels SPX forming one pixel PX on the gate wiring 102. A pair is arranged alongside. 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. As a result, 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, the color filter 106, as shown in FIG. 25, four colored portion R, is constituted G, B, the Y, the colored portion Y of yellow from the figure the left, the red colored portion R, a 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. 24, each pixel electrode 100 has substantially the same dimension in the Y-axis direction, but the dimension in the X-axis direction has the colored portions R, G, B of the color filter 106 facing each other. , Y corresponding to the size of Y.

As mentioned above, although each embodiment of this invention was described in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

Further, the technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

TV: TV receiver, Ca, Cb: cabinet, T: tuner, S: stand 10, 110, 210, 310, 410, 510: liquid crystal display, 11, 111, 211, 311, 411, 511: liquid crystal panel , 12, 112, 212, 312, 412, 512: Backlight device, 13, 113, 213, 313, 413, 513: Bezel, 22, 122, 222, 322, 412, 512: Chassis, 22a, 122a, 222a 322a, 422a, 522a: bottom plate, 23, 123, 223, 323, 423, 523: optical sheet, 24, 124, 224, 324, 424, 524: LED, 25, 125, 225, 325, 425, 525: LED board, 25a, 125a, 225a, 325a, 425a, 525a: side Surface, 25b, 125b, 225b, 325b, 425b, 525b: Restriction part, 25c, 125c, 225c, 325c, 425c, 525c: Light source surface, 26, 126, 226, 326, 426, 526: Light guide plate, 26b, 126b 226b, 326b, 426b, 526b: light incident surface, 33, 133, 233, 333, 433, 533: radiator plate

Claims (15)

  1. A light guide plate having a light incident surface provided on a side surface and a light output surface provided on one plate surface;
    A light source disposed opposite to the light incident surface of the light guide plate;
    A light source surface provided on one plate surface, the light source surface on which the light source is disposed, and a restriction that projects from the light source surface to the light incident surface side than the light source and regulates a distance between the light source and the light incident surface A light source substrate having a portion,
    A lighting device comprising:
  2. The lighting device according to claim 1, wherein a tip of the restricting portion is in contact with the light incident surface.
  3. 3. The illumination device according to claim 1, wherein an angle formed between the light source surface and a surface exposed to the light source side of the restriction portion is 90 ° or more in the light source substrate.
  4. The lighting device according to any one of claims 1 to 3, wherein a reflecting member is disposed on a surface exposed to the light source side of the restricting portion.
  5. An optical sheet that is disposed on the light exit surface side of the light guide plate and has a cover portion that covers the light exit surface, and an extension portion that extends from the cover portion toward the light source side from the light incident surface side; ,
    A bottom plate and a side plate that rises on one surface side of the bottom plate, and has a light output portion on the one surface side, and accommodates at least the light guide plate, the light source, the light source substrate, and the optical sheet. A storage member,
    The light guide plate is arranged such that the light exit surface is directed toward the light exit portion of the housing member,
    The restricting portion protrudes from an end portion on the light output portion side of the housing member of the light source surface,
    The surface of the light source substrate that faces the light exiting portion of the housing member of the restricting portion faces the light exiting surface of the extending portion of the optical sheet in the thickness direction of the light guide plate. The lighting device according to any one of claims 1 to 4, wherein the lighting device is disposed so as to be relatively higher than the bottom plate side.
  6. The lighting device according to claim 5, wherein the extending portion of the optical sheet extends to a position overlapping with the restricting portion in the thickness direction of the light guide plate.
  7. The lighting device according to claim 6, wherein a tip portion of the extending portion is in contact with a surface of the housing member of the restricting portion on the light emitting portion side.
  8. A support plate bottom plate supported by the bottom plate of the housing member, a surface rising from one end edge of the support plate bottom plate toward the light-emitting portion side of the housing member, and a surface opposite to the light source surface of the light source substrate The illumination device according to claim 5, further comprising a support plate having a support plate side plate to be supported.
  9. The support plate side plate of the support plate has a tip surface on the light output portion side of the housing member that is directed to the light output surface side of the extension portion of the optical sheet in the thickness direction of the light guide plate. The lighting device according to claim 8, wherein the lighting device rises up to a height relatively positioned on the bottom plate side.
  10. The support plate bottom plate of the support plate extends to a position facing the opposite surface opposite to the light exit surface of the light guide plate,
    The light guide plate support part which supports the said light guide plate while projecting to the said opposite surface side is provided in the said extension part of the said support plate bottom plate, The Claim 8 or Claim 9 characterized by the above-mentioned. Lighting equipment.
  11. The lighting device according to any one of claims 8 to 10, wherein the support plate has heat dissipation properties.
  12. 12. The lighting device according to claim 11, wherein the light source is arranged to be unevenly distributed on the light output part side of the housing member with respect to the center position of the light source substrate in the thickness direction of the light guide plate.
  13. A display device comprising a display panel that performs display using light from the illumination device according to any one of claims 1 to 12.
  14. The display device according to claim 13, wherein the display panel is a liquid crystal panel using liquid crystal.
  15. A television receiver comprising the display device according to claim 13 or 14.
PCT/JP2012/056103 2011-03-18 2012-03-09 Illumination device, display device, and television reception device WO2012128076A1 (en)

Priority Applications (2)

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JP2011-061081 2011-03-18

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US9570493B2 (en) 2015-04-16 2017-02-14 Taiwan Semiconductor Manufacturing Co., Ltd. Dielectric grid bottom profile for light focusing
US9853076B2 (en) 2015-04-16 2017-12-26 Taiwan Semiconductor Manufacturing Co., Ltd. Stacked grid for more uniform optical input
US9991307B2 (en) 2015-04-16 2018-06-05 Taiwan Semiconductor Manufacturing Co., Ltd. Stacked grid design for improved optical performance and isolation

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US9570493B2 (en) 2015-04-16 2017-02-14 Taiwan Semiconductor Manufacturing Co., Ltd. Dielectric grid bottom profile for light focusing
US9853076B2 (en) 2015-04-16 2017-12-26 Taiwan Semiconductor Manufacturing Co., Ltd. Stacked grid for more uniform optical input
US9991307B2 (en) 2015-04-16 2018-06-05 Taiwan Semiconductor Manufacturing Co., Ltd. Stacked grid design for improved optical performance and isolation

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