WO2010047145A1 - 照明装置、及び表示装置 - Google Patents
照明装置、及び表示装置 Download PDFInfo
- Publication number
- WO2010047145A1 WO2010047145A1 PCT/JP2009/059848 JP2009059848W WO2010047145A1 WO 2010047145 A1 WO2010047145 A1 WO 2010047145A1 JP 2009059848 W JP2009059848 W JP 2009059848W WO 2010047145 A1 WO2010047145 A1 WO 2010047145A1
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- WIPO (PCT)
- Prior art keywords
- cold cathode
- cathode fluorescent
- chassis
- fluorescent tube
- liquid crystal
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V19/00—Fastening of light sources or lamp holders
- F21V19/0075—Fastening of light sources or lamp holders of tubular light sources, e.g. ring-shaped fluorescent light sources
- F21V19/008—Fastening of light sources or lamp holders of tubular light sources, e.g. ring-shaped fluorescent light sources of straight tubular light sources, e.g. straight fluorescent tubes, soffit lamps
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices 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
- G02F1/01—Devices 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
- G02F1/13—Devices 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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133604—Direct backlight with lamps
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices 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
- G02F1/01—Devices 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
- G02F1/13—Devices 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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133608—Direct backlight including particular frames or supporting means
Definitions
- the present invention relates to a lighting device, particularly a lighting device using a discharge tube such as a cold cathode fluorescent tube, and a display device using the same.
- a display device provided with a liquid crystal panel as a flat display unit having many features such as a thinner and lighter weight than a conventional cathode ray tube. Is becoming mainstream.
- a liquid crystal display device includes an illumination device (backlight) that emits light, and a liquid crystal panel that displays a desired image by serving as a shutter for light from a light source provided in the illumination device. Is provided.
- information such as characters and images included in the video signal of the television broadcast is displayed on the display surface of the liquid crystal panel.
- the illumination device is roughly classified into a direct type and an edge light type depending on the arrangement of the light source with respect to the liquid crystal panel.
- a liquid crystal display device having a liquid crystal panel of 20 inches or more is higher than the edge light type.
- a direct-type illumination device that is easy to increase in luminance and size is generally used.
- the direct type lighting device is configured by arranging a plurality of light sources on the back (non-display surface) side of the liquid crystal panel, and since a light source can be arranged immediately behind the liquid crystal panel, a large number of light sources are used. Therefore, it is easy to obtain high luminance and suitable for high luminance and large size.
- the direct type illumination device is suitable for high luminance and large size because the inside of the device has a hollow structure and is light even if it is large.
- a metal chassis that houses a plurality of cold cathode fluorescent tubes as light sources is configured by a frame-shaped frame.
- one side of the opening of the frame is covered with a reflective sheet made of synthetic resin, and light from the cold cathode fluorescent tube is emitted from the other side of the opening of the frame.
- the conventional lighting apparatus as described above has a problem that the lighting performance of each of the plurality of cold cathode fluorescent tubes (discharge tubes) is lowered when the weight is reduced.
- a reflective sheet made of synthetic resin was provided instead of the metal chassis bottom, so the metal chassis bottom was used.
- the metal chassis bottom was used.
- the drive circuit connected to the cold cathode fluorescent tube to drive the cold cathode fluorescent tube it is required to increase the starting voltage at the start of lighting of the cold cathode fluorescent tube. It was done.
- the ambient temperature is low, it is necessary to greatly increase the starting voltage, and the lighting performance of the cold cathode fluorescent tube is significantly reduced.
- an object of the present invention is to provide an illuminating device that can prevent a lighting performance of a discharge tube from being lowered even when the weight is reduced, and a display device using the same. To do.
- a lighting device includes a plurality of discharge tubes, A drive circuit connected to each of the plurality of discharge tubes to drive and drive each of the plurality of discharge tubes; A metal chassis that houses the plurality of discharge tubes; Comprising a synthetic resin reflecting sheet that reflects light from the plurality of discharge tubes;
- the chassis has a frame formed in a frame shape and is provided for each of the plurality of discharge tubes, and is attached to the frame so as to be parallel to the longitudinal direction of the discharge tube immediately below the discharge tube. And a plurality of rib members provided.
- the chassis and the illuminating device can be reduced in weight.
- the chassis is provided with a plurality of rib members that are provided for each of the plurality of discharge tubes and that are attached to the frame so as to be parallel to the longitudinal direction of the discharge tube immediately below the discharge tube.
- a discharge tube support member for supporting a corresponding discharge tube is attached to the rib member.
- a diffusion plate that is provided on one opening side of the frame so as to cover the opening, diffuses light from the plurality of discharge tubes, and diffusion that supports the diffusion plate
- a plate support member The chassis may be provided with a connecting member that is connected to at least one side of the frame and the rib member and to which the diffusion plate support member is attached.
- the chassis is attached to the frame so that the reflection sheet covers the other opening side of the frame.
- the light use efficiency of the discharge tube can be reliably improved.
- the display device of the present invention is characterized by using any one of the above lighting devices.
- a lighting device that can prevent the lighting performance of the discharge tube from being deteriorated even when the weight is reduced, a lightweight and high-performance display device is used. Can be configured easily.
- an illuminating device that can prevent the lighting performance of the discharge tube from being lowered, and a display device using the same, even when the weight is reduced.
- FIG. 1 is a diagram for explaining an illumination device and a liquid crystal display device according to a first embodiment of the present invention.
- FIG. 2 is a plan view showing the chassis shown in FIG.
- FIG. 3 is a diagram illustrating the lamp holder shown in FIG.
- FIG. 4 is a diagram illustrating a circuit configuration of the illumination device illustrated in FIG.
- FIG. 5 is a diagram illustrating a configuration example of the inverter circuit illustrated in FIG.
- FIG. 6 is a view for explaining an illumination device and a liquid crystal display device according to the second embodiment of the present invention.
- FIG. 7 is a plan view showing the chassis shown in FIG.
- FIG. 8 is a view for explaining the diffusion plate support member shown in FIG.
- FIG. 1 is a diagram for explaining an illumination device and a liquid crystal display device according to a first embodiment of the present invention.
- a liquid crystal display device 1 of the present embodiment is configured by using the display element of the present invention, and a liquid crystal panel 2 in which the upper side of FIG. 1 is installed as a viewing side (display surface side), and a liquid crystal panel 2 is provided on the non-display surface side (lower side in FIG. 1), and an illuminating device 3 that generates illumination light for illuminating the liquid crystal panel 2 is provided.
- the liquid crystal panel 2 includes a CF (Color Filter) substrate 4 and an array substrate 5 constituting a pair of substrates, a liquid crystal layer 6 sandwiched between the CF substrate 4 and the array substrate 5, and the CF substrate 4 and the array substrate 5 Are provided on the outer surfaces of the CF substrate 4 and the array substrate 5, respectively. Further, the liquid crystal panel 2 is configured such that the liquid crystal layer 6 can be driven in units of pixels by a liquid crystal driving unit described later. In the liquid crystal panel 2, the polarization state of the illumination light incident through the polarizing plate 8 is modulated by the liquid crystal layer 6 and the amount of light passing through the polarizing plate 7 is controlled, so that a desired image is displayed. Is done.
- the CF substrate 4 and the array substrate 5 are made of a transparent synthetic resin such as a flat glass material or acrylic resin.
- pixel electrodes, TFTs (Thin Film Transistors), and the like are formed between the liquid crystal layer 6 (not shown) according to a plurality of pixels included in the display surface of the liquid crystal panel 2.
- a color filter, a counter electrode, and the like are formed on the CF substrate 4 between the liquid crystal layer 6 (not shown).
- the liquid crystal mode and pixel structure of the liquid crystal panel 2 are arbitrary. Moreover, the drive mode of the liquid crystal panel 2 is also arbitrary. That is, as the liquid crystal panel 2, any liquid crystal panel that can display information can be used. Therefore, the detailed structure of the liquid crystal panel 2 is not shown in FIG.
- FIG. 2 is a plan view showing the chassis shown in FIG. 1
- FIG. 3 is a view for explaining the lamp holder shown in FIG.
- the lighting device 3 includes a plurality of, for example, five cold cathode fluorescent tubes (CCFL) 9 and a metal chassis 10 that houses these cold cathode fluorescent tubes 9. Yes.
- the illumination device 3 includes a reflection sheet 11 that reflects light from the cold cathode fluorescent tube 9 as a discharge tube toward the liquid crystal panel 2, and light from the cold cathode fluorescent tube 9 (the light reflected by the reflection sheet 11 is also A diffusing plate 13 for diffusing, and an optical sheet 14 installed above the diffusing plate 13.
- Each cold-cathode fluorescent tube 9 is made of a straight tube having a diameter of about 3.0 to 4.0 mm and excellent in luminous efficiency, so that it is easy to make the lighting device 3 compact and excellent in luminous efficiency. Can be configured.
- Each cold cathode fluorescent tube 9 is held inside the chassis 10 with the lamp holder 12 as a discharge tube support member keeping the distance between the reflection sheet 11 and the diffusion plate 13 at a predetermined distance. Has been.
- the chassis 10 is also provided with a frame 10a formed in a frame shape and a plurality of rib members 10b provided for each of the plurality of cold cathode fluorescent tubes 9 with reference to FIG.
- the diffusing plate 13 is installed on the opening 10a1 side so as to block the one opening 10a1 side.
- this reflection sheet 11 is provided so that the other opening part 10a2 side may be plugged up.
- the reflection sheet 11 is attached to each of the plurality of rib members 10b by a lamp holder 12, as will be described in detail later.
- Each rib member 10b is attached to the opening 10a2 side of the frame 10a so as to be parallel to the longitudinal direction (the left-right direction in FIG. 2) of the cold cathode fluorescent tube 9 just below the corresponding cold cathode fluorescent tube 9. Yes.
- the dimension in the orthogonal direction (vertical direction in FIG. 2) orthogonal to the longitudinal direction is set to, for example, a dimension of 1 mm or more, and when viewed from the lower side in FIG.
- the member 10b is configured to face the corresponding cold cathode fluorescent tube 9 with the reflection sheet 11 and the lamp holder 12 interposed therebetween.
- the rib member 10b functions as a proximity conductor that allows leakage current to flow when the cold cathode fluorescent tube 9 is turned on.
- Each rib member 10b is provided with two attachment holes 10b1 to which the lamp holder 12 is attached, as illustrated in FIG.
- the cold cathode fluorescent tube 9 held in the lamp holder 12 is accommodated in the chassis 10 by attaching the lamp holder 12 to the attachment hole 10 b 1.
- the lamp holder 12 includes a substantially semicircular holding portion 12a for holding the cold cathode fluorescent tube 9, a base portion 12b for supporting the holding portion 12a, and a base portion 12b.
- a mounting portion 12c extending on the opposite side to the holding portion 12a is provided.
- the holding part 12 a is configured to hold the cold cathode fluorescent tube 9 by contacting the surface of the cold cathode fluorescent tube 9.
- the base portion 12 b is configured in a flat plate shape and is disposed on the surface of the reflection sheet 11.
- the attachment portion 12c is formed in a substantially cylindrical shape, and is inserted through the through hole 11a provided in the reflection sheet 11 and the attachment hole 10b1. Further, as shown in FIG.
- the front end portion of the mounting portion 12c has a triangular cross section, and the front end portion protrudes to the outside of the rib member 10b and is locked on the outer surface of the rib member 10b.
- the lamp holder 12 is assembled to the chassis 10.
- the lamp holder 12 is made of, for example, transparent or white synthetic resin.
- a synthetic resin such as foamed PET (polyethylene terephthalate) resin is used for the reflection sheet 11, and the light from the cold cathode fluorescent tube 9 is reflected to the liquid crystal panel 2 side to thereby form the cold cathode fluorescent tube 9.
- the light utilization efficiency is improved.
- the diffusion plate 13 is made of synthetic resin or glass material.
- the diffusion plate 13 is movably held on the chassis 10, and expands and contracts (plasticity) on the diffusion plate 13 due to the influence of heat such as heat generation of the cold cathode fluorescent tube 9 and temperature rise inside the chassis 10. Even when deformation occurs, the deformation can be absorbed by moving on the chassis 10.
- the optical sheet 14 includes a diffusion sheet made of, for example, a synthetic resin film, and appropriately diffuses the illumination light to the liquid crystal panel 2 to improve the display quality on the display surface of the liquid crystal panel 2. It is configured to let you.
- a known optical sheet material such as a prism sheet or a polarization reflecting sheet for improving the display quality on the display surface of the liquid crystal panel 2 is appropriately laminated on the optical sheet 14 as necessary. ing. Then, the optical sheet 14 converts the planar light emitted from the diffusion plate 13 into planar light having a predetermined luminance (eg, 10000 cd / m 2 ) or more and substantially uniform luminance, thereby illuminating light. As shown in FIG.
- an optical member such as a diffusion sheet for adjusting the viewing angle of the liquid crystal panel 2 may be appropriately laminated above the liquid crystal panel 2 (display surface side).
- the liquid crystal driving unit 15 for driving the liquid crystal panel 2
- an illumination control unit 16 for controlling the driving of each of the plurality of cold cathode fluorescent tubes 9
- An inverter circuit 17 is provided for each cold cathode fluorescent tube 9 as a drive circuit for lighting and driving the corresponding cold cathode fluorescent tube 9 based on a control signal (drive signal) from the illumination control unit 16. .
- FIG. 4 is a diagram illustrating a circuit configuration of the lighting device illustrated in FIG. 1
- FIG. 5 is a diagram illustrating a configuration example of the inverter circuit illustrated in FIG.
- the inverter circuit 17 is installed on one end side in the longitudinal direction of each cold cathode fluorescent tube 9. It is comprised so that an electric current may be supplied from the one end part side. Further, as described in detail later, for example, a half bridge type inverter circuit 17 is used for the inverter circuit 17, and the inverter circuit 17 uses the PWM dimming based on the drive signal to correspond to the corresponding cold cathode.
- the fluorescent tube 9 can be driven.
- the illumination device 3 includes a lamp current detection circuit RC that is provided for each cold cathode fluorescent tube 9 and detects a lamp current value flowing through the corresponding cold cathode fluorescent tube 9.
- the lamp current value detected by the lamp current detection circuit RC is output to the illumination control unit 16 via a feedback circuit FB installed according to each cold cathode fluorescent tube 9.
- a dimming instruction signal for changing the luminance of the light-emitting surface of the illuminating device 3 is input to the illumination control unit 16 as an instruction signal from the outside.
- the brightness (brightness) on the display surface of the liquid crystal panel 2 can be changed as appropriate.
- the illumination control unit 16 is configured to receive a dimming instruction signal from an operation input device (not shown) such as a remote controller provided on the liquid crystal display device 1 side, for example. And the illumination control part 16 determines the target value of the electric current supplied to each cold cathode fluorescent tube 9 while determining the duty ratio in PWM dimming using the input dimming instruction signal. ing.
- the illumination control unit 16 generates and outputs a drive signal to each inverter circuit 17 based on the determined target value, whereby the value of the lamp current flowing through the corresponding cold cathode fluorescent tube 9 changes.
- the amount of emitted light emitted from each cold cathode fluorescent tube 9 changes according to the dimming instruction signal, so that the luminance on the light emitting surface of the illumination device 3 and the luminance on the display surface of the liquid crystal panel 2 are increased. It is changed appropriately according to the user's operation instruction.
- the lamp current value actually supplied to each cold cathode fluorescent tube 9 is fed back as a detected current value to the illumination control unit 16 via the corresponding lamp current detection circuit RC and feedback circuit FB. Then, the illumination control unit 16 performs feedback control using the detected current value and the target value of the supply current determined based on the dimming instruction signal, so that the display at the brightness desired by the user is performed. Is maintained.
- the inverter circuit 17 includes a first and second switching members that are connected to the transformer 17 a and the illumination control unit 16 and are provided in series with each other on the primary winding side of the transformer 17 a.
- a half-bridge type including 17b and 17c and a drive power source 17d connected to the first switching 17b is used.
- a field effect transistor FET is used for each of the first and second switching members 17b and 17c, and as described in detail later, the phase is 180 ° different from the illumination control unit 16 as the drive signal.
- FET field effect transistor
- the inverter circuit 17 is adapted to light up the corresponding cold cathode fluorescent tube 9 at a high frequency. That is, the secondary winding of the transformer 17 a is connected to the high voltage side terminal of any one of the cold cathode fluorescent tubes 9, and the first and second switching members 17 b and 17 c are connected to the first winding from the illumination control unit 16. By performing a switching operation based on the first and second drive signals, the transformer 17a supplies power to the corresponding cold cathode fluorescent tube 9 and turns on the cold cathode fluorescent tube 9.
- a frame body 10 a formed in a frame shape is provided in a metal chassis 10 that houses a plurality of cold cathode fluorescent tubes (discharge tubes) 9.
- the chassis 10 is provided for each of the plurality of cold cathode fluorescent tubes 9 and is attached to the frame 10a so as to be parallel to the longitudinal direction of the cold cathode fluorescent tube 9 immediately below the cold cathode fluorescent tube 9.
- a plurality of rib members 10b are installed.
- the illumination device 3 of the present embodiment unlike the conventional example, when the cold cathode fluorescent tube 9 is turned on, a leakage current can flow through the corresponding rib member 10b, and the inverter circuit (drive circuit) ) There is no need to increase the starting voltage at 17. Therefore, in the present embodiment, unlike the conventional example, it is possible to configure the lighting device 3 that can prevent the lighting performance of the cold cathode fluorescent tube 9 from being lowered even when the weight is reduced.
- the lamp member (discharge tube support member) 12 that supports the corresponding cold cathode fluorescent tube 9 is attached to the rib member 10b, the cold cathode fluorescent tube 9 is attached to the chassis 10 with high accuracy.
- the illuminating device 3 which can be attached and is excellent in light emission quality can be configured easily.
- the cold cathode fluorescent tube 9 the cold cathode fluorescent tube 9 The light utilization efficiency can be improved reliably.
- the lighting device 3 that can prevent the lighting performance of the cold cathode fluorescent tube 9 from being lowered even when the weight is reduced, a light-weight and high-performance liquid crystal display is used.
- the apparatus 1 can be configured easily.
- FIG. 6 is a view for explaining an illumination device and a liquid crystal display device according to the second embodiment of the present invention
- FIG. 7 is a plan view showing the chassis shown in FIG.
- the main difference between the present embodiment and the first embodiment is that a diffusion plate support member for supporting the diffusion plate is provided and the diffusion plate support member is attached to a connecting member provided in the chassis. It is.
- symbol is attached
- the connecting member 10c is provided below the rib member 10b so as to be orthogonal to the rib member 10b.
- a diffusion plate support member 18 that supports the diffusion plate 13 is attached to the connecting member 10c.
- the connecting member 10 c is a frame body in parallel with the orthogonal direction orthogonal to the longitudinal direction of the cold cathode fluorescent tube 9 and at the central portion in the longitudinal direction of the chassis 10.
- the lower side of 10a and the lower side of the rib member 10 are connected.
- two attachment holes 10c1 for attaching the diffusion plate support member 18 are formed in the connecting member 10c, and the two diffusion plate support members 18 are installed in the chassis 10 via the connection member 10c. It has become so.
- diffusion plate support member 18 will be specifically described with reference to FIG.
- FIG. 8 is a diagram for explaining the diffusion plate support member shown in FIG.
- the diffusion plate support member 18 has a substantially conical support portion 18a, a base portion 18b that supports the support portion 18a, and an attachment extending from the base portion 18b to the opposite side of the support portion 18a.
- a portion 18c is provided.
- the support portion 18a is configured to contact and substantially support the surface of the diffusion plate 13, and is provided so as to be inserted through the through hole 11b provided in the reflection sheet 11.
- the base 18b is configured in a flat plate shape and is disposed on the surface of the connecting member 10c.
- the mounting portion 18c is formed in a substantially cylindrical shape, and is inserted through the mounting hole 10c1. Further, as shown in FIG.
- the front end portion of the mounting portion 18c has a triangular cross section, and the front end portion protrudes outside the connecting member 10c and is locked on the outer surface of the connecting member 10c.
- the diffusion plate support member 18 is assembled to the chassis 10.
- the diffusion plate support member 18 is made of, for example, transparent or white synthetic resin.
- the lighting device 3 of the present embodiment can exhibit the same operations and effects as those of the first embodiment.
- the diffusion plate support member 18 is attached to this connection member 10c.
- it can prevent that a deformation
- the device 3 can be easily configured.
- the lighting device of the present invention is not limited to this, and the image,
- the present invention can be applied to various display devices including a non-light emitting display unit that displays information such as characters.
- the illumination device of the present invention can be suitably used for a transflective liquid crystal display device or a projection display device using a liquid crystal panel as a light valve.
- the discharge tube of the present invention is not limited to this, and a hot cathode fluorescent tube, a xenon fluorescent tube, etc.
- Other discharge fluorescent tubes can also be used.
- the present invention can be applied to a discharge tube having a shape other than a straight tube such as a U-shaped tube or a pseudo-U-shaped tube.
- the reflection sheet of the present invention is limited to this. Instead, for example, a plurality of reflection sheets may be used. That is, a configuration in which a plurality of reflection sheets are attached between two adjacent rib members and between the frame body and the rib members so that the other opening side of the frame body is closed may be employed.
- the connecting member provided in the orthogonal direction orthogonal to the longitudinal direction of the cold cathode fluorescent tube discharge tube
- the present invention is not limited to this, as long as it is connected to at least one side of the chassis frame and the rib member and the diffusion plate support member can be attached thereto.
- an inverter circuit is provided on one end of the cold cathode fluorescent tube, and power is supplied from the one end to the cold cathode fluorescent tube.
- the present invention is not limited to this, and the present invention can also be applied to a configuration in which an inverter circuit is provided on the other end side and the cold cathode fluorescent tube is driven on both sides.
- the present invention is useful for an illuminating device that can prevent the lighting performance of a discharge tube from decreasing even when the weight is reduced, and a display device using the illuminating device.
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Abstract
Description
前記複数の各放電管に接続され、前記複数の各放電管を点灯駆動する駆動回路と、
前記複数の放電管を収容する金属製のシャーシと、
前記複数の放電管からの光を反射する合成樹脂製の反射シートを備え、
前記シャーシには、枠状に形成された枠体と、前記複数の放電管毎に設けられるとともに、前記放電管の真下側で前記放電管の長手方向に平行となるように前記枠体に取り付けられた複数のリブ部材とが設けられていることを特徴とするものである。
前記シャーシには、前記枠体及び前記リブ部材の少なくとも一方側に連結されるとともに、前記拡散板支持部材が取り付けられる連結部材が設けられてもよい。
図1は、本発明の第1の実施形態にかかる照明装置及び液晶表示装置を説明する図である。図1において、本実施形態の液晶表示装置1は、本発明の表示素子を用いて構成されるとともに、図1の上側が視認側(表示面側)として設置される液晶パネル2と、液晶パネル2の非表示面側(図1の下側)に配置されて、当該液晶パネル2を照明する照明光を発生する照明装置3とが設けられている。
取付部12cは、略円柱状に構成されており、反射シート11に設けられた貫通孔11a及び上記取付孔10b1に挿通されている。また、この取付部12cの先端部分は、図3に示すように、断面三角形状に構成されており、当該先端部分が、リブ部材10bの外部に突出して、リブ部材10bの外側表面で係止されることにより、ランプホルダー12は、シャーシ10に組み付けられる。尚、ランプホルダー12には、例えば透明または白色の合成樹脂が用いられている。
図6は本発明の第2の実施形態にかかる照明装置及び液晶表示装置を説明する図であり、図7は図6に示したシャーシを示す平面図である。図において、本実施形態と上記第1の実施形態との主な相違点は、拡散板を支持する拡散板支持部材を設けるとともに、この拡散板支持部材をシャーシに設けた連結部材に取り付けた点である。なお、上記第1の実施形態と共通する要素については、同じ符号を付して、その重複した説明を省略する。
3 照明装置
9 冷陰極蛍光管(放電管)
10 シャーシ
10a 枠体
10a1、10a2 開口部
10b リブ部材
10c 連結部材
11 反射シート
12 ランプホルダー(放電管支持部材)
13 拡散板
17 インバータ回路(駆動回路)
18 拡散板支持部材
Claims (5)
- 複数の放電管と、
前記複数の各放電管に接続され、前記複数の各放電管を点灯駆動する駆動回路と、
前記複数の放電管を収容する金属製のシャーシと、
前記複数の放電管からの光を反射する合成樹脂製の反射シートを備え、
前記シャーシには、枠状に形成された枠体と、前記複数の放電管毎に設けられるとともに、前記放電管の真下側で前記放電管の長手方向に平行となるように前記枠体に取り付けられた複数のリブ部材とが設けられている、
ことを特徴とする照明装置。 - 前記リブ部材には、対応する放電管を支持する放電管支持部材が取り付けられている請求項1に記載の照明装置。
- 前記枠体の一方の開口部側に当該開口部を覆うように設けられるとともに、前記複数の放電管からの光を拡散する拡散板と、前記拡散板を支持する拡散板支持部材を備え、
前記シャーシには、前記枠体及び前記リブ部材の少なくとも一方側に連結されるとともに、前記拡散板支持部材が取り付けられる連結部材が設けられている請求項1または2に記載の照明装置。 - 前記シャーシでは、前記反射シートが前記枠体の他方の開口部側を覆うように当該枠体に取り付けられている請求項1~3のいずれか1項に記載の照明装置。
- 請求項1~4のいずれか1項に記載の照明装置を用いたことを特徴とする表示装置。
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US13/122,441 US20110205732A1 (en) | 2008-10-24 | 2009-05-29 | Illuminating device and display device |
CN200980139703XA CN102171508A (zh) | 2008-10-24 | 2009-05-29 | 照明装置和显示装置 |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10172322A (ja) * | 1997-12-11 | 1998-06-26 | Seiko Epson Corp | 光源装置 |
JP2005347005A (ja) * | 2004-06-01 | 2005-12-15 | Sumitomo Rubber Ind Ltd | 発光装置、及び液晶表示装置 |
JP2007034120A (ja) * | 2005-07-29 | 2007-02-08 | Sharp Corp | 直下式バックライト装置および直下式バックライト装置を用いた液晶表示装置 |
JP2008299170A (ja) * | 2007-06-01 | 2008-12-11 | Hitachi Ltd | 映像表示装置及びそれに用いられるバックライトユニット |
Family Cites Families (1)
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JP3578750B2 (ja) * | 2002-06-19 | 2004-10-20 | シャープ株式会社 | 液晶表示装置 |
-
2009
- 2009-05-29 CN CN200980139703XA patent/CN102171508A/zh active Pending
- 2009-05-29 US US13/122,441 patent/US20110205732A1/en not_active Abandoned
- 2009-05-29 WO PCT/JP2009/059848 patent/WO2010047145A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10172322A (ja) * | 1997-12-11 | 1998-06-26 | Seiko Epson Corp | 光源装置 |
JP2005347005A (ja) * | 2004-06-01 | 2005-12-15 | Sumitomo Rubber Ind Ltd | 発光装置、及び液晶表示装置 |
JP2007034120A (ja) * | 2005-07-29 | 2007-02-08 | Sharp Corp | 直下式バックライト装置および直下式バックライト装置を用いた液晶表示装置 |
JP2008299170A (ja) * | 2007-06-01 | 2008-12-11 | Hitachi Ltd | 映像表示装置及びそれに用いられるバックライトユニット |
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CN102171508A (zh) | 2011-08-31 |
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