WO2012066887A1 - Illuminating device and liquid crystal display device provided therewith - Google Patents

Illuminating device and liquid crystal display device provided therewith Download PDF

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Publication number
WO2012066887A1
WO2012066887A1 PCT/JP2011/073660 JP2011073660W WO2012066887A1 WO 2012066887 A1 WO2012066887 A1 WO 2012066887A1 JP 2011073660 W JP2011073660 W JP 2011073660W WO 2012066887 A1 WO2012066887 A1 WO 2012066887A1
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WO
WIPO (PCT)
Prior art keywords
light
reflecting portion
circuit board
guide plate
led
Prior art date
Application number
PCT/JP2011/073660
Other languages
French (fr)
Japanese (ja)
Inventor
和昭 野本
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
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2012066887A1 publication Critical patent/WO2012066887A1/en

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical 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
    • G02B6/0086—Positioning aspects
    • G02B6/009—Positioning aspects of the light source in the package
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical 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
    • G02B6/0086—Positioning aspects
    • G02B6/0091—Positioning aspects of the light source relative to the light guide
    • 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
    • G02F1/133605—Direct backlight including specially adapted reflectors

Definitions

  • the present invention relates to an illuminating device used as a light source for a liquid crystal television or the like and a liquid crystal display device including the illuminating device, and more specifically, an illuminating device including a circuit board on which a plurality of LEDs are mounted and the illuminating device.
  • the present invention relates to a liquid crystal display device.
  • a general liquid crystal display device includes a liquid crystal display panel and an illumination device (backlight device) disposed on the back side of the liquid crystal display panel so as to irradiate the liquid crystal display panel with light.
  • an illumination device backlight device
  • a sidelight type (edge light type) illumination device including a light guide plate and a light source disposed along one or a plurality of sides of the light guide plate is known.
  • Such a sidelight type illuminating device has advantages such as being easily reduced in thickness as compared with a direct type illuminating device in which a light source is disposed on the back surface of a liquid crystal display panel.
  • FIG. 9 and FIG. 10 are an exploded perspective view and a cross-sectional view of the main part showing a schematic configuration of a liquid crystal display device provided with a sidelight type illumination device using such LEDs.
  • the liquid crystal display device 100 includes a bezel 102, a liquid crystal display panel 103, and a lighting device 104.
  • the bezel 102 has a frame shape that covers the periphery of the liquid crystal display panel 103, and ensures the strength of the entire liquid crystal display device 100 together with the chassis 114.
  • the liquid crystal display panel 103 is formed by bonding two pieces of glass and sealing the liquid crystal therebetween, so that an image can be displayed on the front surface.
  • the illumination device 104 includes a chassis 114 having a shallow box shape. On the rectangular bottom plate portion 114a of the chassis 114, the optical sheets 107 to 109, the light guide plate 111, the reflection sheet 110, and the circuit board 120 are provided. Is stored.
  • the light guide plate 111 has a light incident surface 111a for introducing light from the LEDs 121 included in the circuit board 120, and the light introduced from the light incident surface 111a upward (irradiation direction). And a light emitting surface 111b for emitting the light.
  • the light incident surface 111 a is configured by a predetermined side end surface of the light guide plate 111
  • the light emitting surface 111 b is configured by the front surface of the light guide plate 111.
  • the reflection sheet 110 is disposed so as to cover the back surface 111c of the light guide plate 111 opposite to the light emitting surface 111b.
  • the optical sheets 107 to 109 include a diffusion sheet, a lens sheet, and the like, and are disposed on the light emitting surface 111b of the light guide plate 111.
  • the optical sheets 107 to 109, the light guide plate 111, and the reflection sheet 110 are fixed in a stacked state on the bottom plate portion 114a of the chassis 114 by the frame 105.
  • the plurality of LEDs 121 arranged linearly along the longitudinal direction of the circuit board 120 are arranged in the vicinity of the light incident surface 111 a of the light guide plate 111. Further, the light emitting surface 121 a of the LED 121 is disposed at a predetermined interval along the light incident surface 111 so as to face the light incident surface 111 a of the light guide plate 111. In this case, the circuit board 120 is disposed so as to stand (stand up) along the side plate portion 114b of the chassis 114.
  • the following patent document is mentioned as a prior art document relevant to this invention.
  • the problem to be solved by the present invention is an illumination device capable of suppressing the in-plane distribution of the intensity of light emitted from the front surface of the light guide plate and a liquid crystal display including the same. Is to provide a device.
  • the present invention provides a lighting device including a plate-shaped light guide plate and a horizontally long circuit board on which a plurality of LEDs that irradiate light are mounted on the side end surfaces of the light guide plate.
  • a first reflecting portion is formed in a predetermined region, and light is emitted from the first reflecting portion in a region other than the first reflecting portion.
  • the gist of the present invention is that a second reflecting portion having a low reflectance is formed.
  • the reflectance of light on the surface of the circuit board on which the LEDs are mounted so as to suppress the occurrence of uneven brightness in the vicinity of the side end surface (light incident surface) of the light guide plate described above.
  • the first reflection part and the second reflection part different from each other, the light reflected from the surface of the circuit board can be introduced into the side end face (light incident face) of the light guide plate as a uniform uniform as a whole, It is possible to suppress the in-plane distribution of the intensity of light emitted from the front surface (light emitting surface) of the light guide plate from becoming non-uniform.
  • the first reflecting portion is arranged between the adjacent LEDs, and the second reflecting portion is arranged around each LED.
  • the surface portion between the adjacent LEDs has a high light reflectance by the first reflecting portion, and the surface around each LED. Since the light reflectance is lowered by the second reflecting portion having a reflectance lower than that of the first reflecting portion, the portion is lightened where the LEDs are arranged and the phenomenon of darkening between adjacent LEDs is alleviated. It is possible to suppress the occurrence of uneven brightness in the vicinity of the side end surface (light incident surface) of the light guide plate.
  • the light reflected from the surface of the circuit board can be introduced into the side end surface (light incident surface) of the light guide plate as uniform as a whole, and the light emitted from the front surface (light output surface) of the light guide plate can be introduced. It is possible to suppress unevenness of the in-plane distribution of strength.
  • the light emitting surface of the LED is opposite to the mounting surface.
  • the second reflecting portion has a substantially elliptical shape when viewed in plan, or the LED has a side where the light emitting surface is orthogonal to the mounting surface.
  • the second reflecting portion has a substantially trapezoidal shape that is wide toward the light emission side of the LED when viewed in plan.
  • the first reflection part may be arranged at the end of the circuit board. According to such a configuration, normally, the reflectance of light at the end of the circuit board where the LED is not disposed is increased by the first reflecting portion, and the reflectance of light in the region where the LED is disposed is second. By making it low by the reflection portion, it is possible to suppress the occurrence of unevenness on the side end surface of the light guide plate facing the end portion of the circuit board.
  • Such a first reflecting portion is exemplified by white, and the second reflecting portion is exemplified by green or black.
  • the second reflecting portion is configured to exhibit a green color
  • a green (white) color generally adopted as a solder resist color printed on the surface of the circuit board in order to protect and insulate the wiring of the circuit board.
  • the second reflecting portion is black, the light returning from the light guide plate or the like to the circuit board can be absorbed and hardly reflected, so the LED is disposed. It is possible to alleviate the phenomenon of the brightness unevenness described above by reducing the phenomenon of bright and darkening between adjacent LEDs.
  • the color of the first reflecting part is not limited to white, but yellow or the like can be applied.
  • the color of the second reflecting part may be any color that has a lower reflectance than the first reflecting part.
  • the reflectance of the light of the second reflector is lower than the reflectance of the light of the first reflector, in other words, the reflectance of the light of the first reflector is higher than the reflectance of the light of the second reflector. What is necessary is just to select suitably the color which a 1st reflection part exhibits, and the color which a 2nd reflection part exhibits so that it may become a structure.
  • the liquid crystal display device which concerns on this invention makes it a summary to provide such an illuminating device and the liquid crystal display panel which performs a display using the light from the illuminating device. Is. According to such a liquid crystal display device, since the in-plane distribution of the intensity of light applied to the back side of the liquid crystal display panel is suppressed, deterioration in display quality is prevented or suppressed. Image display can be realized.
  • the in-plane distribution of the intensity of light emitted from the front surface of the light guide plate is prevented from being non-uniform, it is possible to realize an image display in which deterioration in display quality is prevented and suppressed. Can do.
  • FIG. 1 is an exploded perspective view showing a schematic configuration of a liquid crystal display device according to a first embodiment of the present invention. It is sectional drawing which expanded and showed the principal part after the assembly of the liquid crystal display device of FIG. It is the figure which expanded and showed the principal part of the circuit board of FIG. 1, (a) is a top view, (b) is sectional drawing. 4A and 4B are diagrams showing a modification of the circuit board in FIG. 3, in which FIG. 3A is a plan view and FIG. It is sectional drawing which expanded and showed the principal part of the liquid crystal display device which concerns on the 2nd Embodiment of this invention. It is the top view which looked at the circuit board and light guide plate of FIG. 5 from the back side.
  • FIG. A is the top view which showed the circuit board based on the 3rd Embodiment of this invention
  • (b) is the top view which showed the circuit board concerning the 4th Embodiment of this invention.
  • disassembled perspective view which showed schematic structure of the liquid crystal display device used conventionally. It is sectional drawing which expanded and showed the principal part after the assembly of the liquid crystal display device of FIG. It is the top view which showed typically the nonuniformity of the brightness near the side end surface of a light-guide plate.
  • FIG. 1 is an exploded perspective view schematically showing a liquid crystal display device according to a first embodiment of the present invention.
  • the liquid crystal display device 1 includes a liquid crystal display panel 3 and an illumination device (backlight device) 4 for irradiating the liquid crystal display panel 3 with light, and these are integrally held by a frame-like bezel 2 or the like. It has become so.
  • the bezel 2 has a frame shape that covers the periphery of the liquid crystal display panel 3, and ensures the strength of the entire liquid crystal display device 1 together with the chassis 14 included in the illumination device 4.
  • the liquid crystal display panel 3 has a horizontally long rectangular shape when viewed from above.
  • a pair of glass substrates comprising a thin film transistor (TFT) array substrate and a color filter (CF) substrate are bonded together in parallel at a predetermined interval, and a liquid crystal is sandwiched between the glass substrates. It has an enclosed configuration.
  • TFT thin film transistor
  • CF color filter
  • a plurality of TFTs and pixel electrodes are formed in a matrix on the TFT array substrate, and a plurality of colored patterns are formed in a matrix on the CF substrate, and a common electrode is formed on almost the entire surface.
  • An image can be displayed by controlling the orientation of the liquid crystal by changing the voltage applied between the first electrode and the common electrode.
  • a polarizing plate is disposed on each of the front and back surfaces of the liquid crystal display panel 3.
  • the illumination device 4 is a so-called side light type (edge light type) illumination device.
  • the illumination device 4 includes a substantially box-shaped chassis 14 having an opening opened toward the liquid crystal display panel 3 side, and optical sheets 7 to 9 arranged so as to cover the opening of the chassis 14. Is provided. Further, inside the chassis 14, a circuit board 20 on which a plurality of LEDs (light emitting diodes) 21 that are light sources are mounted, a light guide plate 11 that guides light from the LEDs 21 to the liquid crystal display panel 3 side, and the light guide plate 11.
  • the reflective sheet 10 distribute
  • the frame 5 is for fixing the optical sheets 7 to 9, the light guide plate 11 and the reflection sheet 10 to the chassis 14 in a state where they are laminated in this order from above.
  • the frame 5 is formed in a frame shape (frame shape) extending along the outer peripheral end portion of the light guide plate 11, and the outer peripheral end portions of the optical sheets 7 to 9 and the light guide plate 11 extend over substantially the entire circumference. It can be pressed from the front side.
  • the frame 5 is made of, for example, white synthetic resin and has a light shielding property. Further, the frame 5 can receive the back surface of the outer peripheral end portion of the liquid crystal display panel 3 by the upper surface of the frame portion 5a.
  • the chassis 14 is formed into a shallow box shape by bending a metal plate made of aluminum or the like, and accommodates the optical sheets 7 to 9, the light guide plate 11, the reflection sheet 10, and the circuit board 20 therein. You can do that.
  • the chassis 14 includes a bottom plate portion 14a having a horizontally long rectangular shape when viewed from above and a side plate portion 14b rising from the outer edges of the four sides of the bottom plate portion 14a. Further, the above-described frame 5 and bezel 2 can be screwed to the side plate portion 14b.
  • the three optical sheets 7 to 9 are composed of thin resin sheets having a horizontally long rectangular shape when seen in a plan view.
  • the optical sheets 7 to 9 are placed on the front side (light emitting side) of the light guide plate 11 and are interposed between the liquid crystal display panel 3 and the light guide plate 11.
  • a polarization selective reflection sheet 7, a lens sheet 8 and a diffusion sheet 9 having a thickness of about 0.1 to 0.5 mm are used in order from the top.
  • the diffusion sheet 9 is for making the luminance distribution uniform by diffusing the light emitted from the light guide plate 11.
  • the lens sheet 8 is for increasing the front luminance by condensing the light emitted from the diffusion sheet 9.
  • the polarization selective reflection sheet 7 is for selectively reflecting the light emitted from the lens sheet 8 so that the light is not absorbed by a polarizing plate (not shown) attached to the back surface of the liquid crystal display panel 3.
  • the light guide plate 11 is formed of a transparent resin plate having a horizontally long rectangular shape in a plan view and having a thickness of about 3 to 4 mm, for example.
  • the light guide plate 11 has a light incident surface 11a for introducing light from the LED 21 and a light emission surface 11b for emitting light introduced from the light incident surface 11a upward (irradiation direction). ing.
  • the light incident surface 11 a is configured by the side end surface on the long side of the light guide plate 11, and the light output surface 11 b is configured by the front surface of the light guide plate 11.
  • the light guide plate 11 reflects light incident from the light incident surface 11a repeatedly between the light emitting surface (front surface) 11b and the back surface 11c opposite to the light emitting surface 11b, and forms a planar shape inside the light guiding plate 11 It can be expanded.
  • a plurality of scattering portions are formed on the back surface 11c of the light guide plate 11 to scatter light incident from the light incident surface 11a and emit the light from the light emitting surface 11b.
  • a scattering part what was formed by printing the coating material containing a white pigment etc. on the back surface 11c of the light-guide plate 11 in the shape of a spot is applied.
  • the plurality of LEDs 21 provided on the circuit board 20 are disposed in the vicinity of the light incident surface 11 a of the light guide plate 11.
  • the LED 21 has a package structure in which, for example, an LED chip that generates blue light is sealed with a transparent resin mixed with a yellow phosphor, and white light can be emitted from the light emitting surface 21a of the LED 21. Yes.
  • the LED 21 is a so-called top view type LED having a light emitting surface 21a opposite to the mounting surface. In this case, the LEDs 21 are arranged at a predetermined interval along the light incident surface 11 a so that the light emitting surface 21 a faces the light incident surface 11 a of the light guide plate 11.
  • the reflection sheet 10 is disposed so as to cover the back surface 11c of the light guide plate 11 opposite to the light emitting surface 11b.
  • the reflection sheet 10 is laid on the bottom plate portion 14a of the chassis 14.
  • the reflection sheet 10 is for reflecting light emitted from the back surface 11c of the light guide plate 11 to the back side toward the light guide plate 11, and is made of a white resin having a thickness of about 0.1 to 2 mm, for example. Consists of sheets.
  • the light emitted from the back surface 11 c of the light guide plate 11 is efficiently reflected by the reflection sheet 10 toward the light guide plate 11, so that the light utilization efficiency and the luminance at the light output surface 11 b of the light guide plate 11 are enhanced.
  • the illumination device 4 can convert the light from the LED 21 into the planar light by the optical sheets 7 to 9, the light guide plate 11 and the reflection sheet 10 and irradiate the back side of the liquid crystal display panel 3. Yes.
  • a power supply board 18 that supplies power to the circuit board 20 and a control board 19 that drives the liquid crystal display panel 3 are disposed.
  • a first reflecting portion 31 having a white color is formed in a region between adjacent LEDs 21 and 21 on the surface of the circuit board 20 (the surface on which the LED 21 is mounted).
  • a second reflecting portion 32 having a color with a light reflectance lower than that of the first reflecting portion 31 is formed.
  • the first reflecting portion 31 is formed to have a white color by printing (coating) a white resist or the like on the surface of the circuit board 20.
  • the 2nd reflection part 32 is formed so that it may exhibit green as an intermediate color whose reflectance is lower than white by printing (application
  • the circuit board 20 includes an insulator 23 on which various electrical components are mounted by printing a so-called electrical circuit.
  • the insulator has a horizontally long rectangular shape.
  • a wiring pattern 24 made of copper foil or the like for supplying power (electric power) to the LED 21 is formed on the LED 23, and the plurality of LEDs 21 are connected in series by the wiring pattern 24.
  • solder resist 25 is applied so as to cover the entire surface of the insulator 23 including the wiring pattern 24.
  • the solder resist 25 is used to protect and insulate the wiring pattern 24.
  • the color of the solder resist 25 is usually green for reasons such as being easy on the eyes of the operator in the inspection process. Examples of the color exhibited by the solder resist 25 include green and brown or gray as an intermediate color having a lower reflectance than white.
  • an opening 25a is formed in the solder resist 25 so that the electrode 24a of the lower wiring pattern 24 is exposed, and an electrode is formed using this opening 25a.
  • the part 24 a is connected to the LED 21 by the solder 26.
  • a white resist 27 having a predetermined pattern is formed on the surface of the circuit board 20 (the surface on which the LED 21 is mounted), that is, the upper surface of the solder resist 25.
  • the white resist 27 is formed by, for example, a screen printing method.
  • the screen printing method is a method of printing with a screen plate provided with a predetermined pattern of openings, covering the printing symmetry and applying ink from the opening, and the printing symmetry is not flat but curved. Therefore, it is widely used as a circuit board printing method.
  • the 1st reflection part 31 which exhibits white may be formed using the coating material containing a white pigment etc. instead of a white resist.
  • the white resist 27 is printed so as to surround the LED 21 in a substantially elliptical shape.
  • the white resist 27 is formed on the surface of the circuit board 20 (the upper surface of the solder resist 25) other than the ellipse (second reflecting portion 32) surrounding the LED 21, and the white resist 27 exhibits white.
  • the 1st reflection part 31 is comprised.
  • the solder resist 25 that is not covered by the first reflecting portion 31 (white resist 27) constitutes the second reflecting portion 32 that exhibits green color (color having a lower light reflectance than white). Yes.
  • the first reflecting portion 31 exhibiting white is formed in the region between the adjacent LEDs 21 and 21, and the area around each LED 21 is In the predetermined region, a second reflecting portion 32 having a color (for example, an intermediate color such as green) having a light reflectance lower than that of the first reflecting portion 31 is formed.
  • a color for example, an intermediate color such as green
  • the portion between the adjacent LEDs 21 and 21 has a high light reflectance by the first reflecting portion 31 that exhibits white, and the portion around each LED 21 has a reflectance higher than that of white.
  • the light reflectance is lowered by the second reflecting portion 32 exhibiting a low color.
  • the light reflected from the surface of the circuit board 20 is made uniform as a whole, and the side end surface (light incident surface) 11a of the light guide plate 11 is made. It is possible to prevent the in-plane distribution of the intensity of light emitted from the front surface (light emitting surface) 11b of the light guide plate from becoming uneven.
  • the solder resist 25 may be eliminated, and the white resist 27 that is the first reflecting portion 31 may be used to protect and insulate the wiring pattern 24.
  • the cost for manufacturing the circuit board 20 can be reduced.
  • the color of the second reflecting portion 32 exhibits the color of the insulator 23 itself and the color of the wiring pattern 24 due to the abolition of the solder resist 35, but these colors are more reflective than white. As long as the value is low.
  • FIG. 4 shows a schematic configuration of a circuit board 40 according to a modification.
  • the first reflecting portion 31 formed in the region between the adjacent LEDs 21 and 21 is white
  • the second reflecting portion is formed in the region surrounding each LED 21. 42 is black.
  • the second reflecting portion 42 is formed on the solder resist 27 so as to exhibit a black color by printing the black resist 43 in an oval shape.
  • the 2nd reflection part 42 can be simply formed by using the screen printing method etc. which were mentioned above.
  • the second reflecting portion 42 exhibiting black may be formed using a paint containing a black pigment or the like instead of the black resist.
  • the 2nd reflection part 42 formed so that it encloses each LED21 exhibits black
  • the light which returns to the circuit board 20 from the light-guide plate 11 etc. in this 2nd reflection part 42 is absorbed, and it reflects almost. You can avoid it. Therefore, the phenomenon in which the LED 21 is arranged brightly and the darkness between the adjacent LEDs 21 and 21 is further alleviated, and the occurrence of uneven brightness in the vicinity of the side end surface (light incident surface) 11a of the light guide plate 11 is further suppressed. Is possible.
  • the solder resist 25 is eliminated, and the white resist 27 as the first reflecting portion 31 and the black resist 43 as the second reflecting portion 42 are used for protecting and insulating the wiring pattern 24. It is also possible to adopt a configuration such as By eliminating the solder resist 25, the cost for manufacturing the circuit board 40 can be reduced.
  • FIG. 5 is an enlarged cross-sectional view showing a main part of the liquid crystal display device according to the second embodiment
  • FIG. 6 is a plan view of the circuit board and the light guide plate of FIG.
  • the LED 51 provided on the circuit board 50 is a side view type LED whose light emitting surface 51a is orthogonal to the mounting surface.
  • the circuit board 50 is disposed so as to be parallel to the back surface of the frame portion 5 a of the frame 5.
  • the circuit board 50 has the same cross-sectional structure as the circuit board 20 shown in FIG. 3B described in the first embodiment. Further, the end of the reflection sheet 10 is extended so as to cover the side plate portion 14 b of the chassis 14.
  • a first reflecting portion 61 having a white color is formed in a region between the adjacent LEDs 51, 51, In a predetermined region around each LED 51, a second reflecting portion 62 having a color with a light reflectance lower than that of the first reflecting portion 61 is formed.
  • the first reflecting portion 61 is formed to have a white color by printing (coating) a white resist or the like on the surface of the circuit board 50.
  • the 2nd reflection part 62 is formed so that green may be exhibited as an intermediate color whose reflectance is lower than white by printing (application
  • the second reflecting portion 62 has a substantially trapezoidal shape that is wide toward the light emission side from the light emitting surface 51a of the LED 51 when viewed in plan.
  • the portion between the adjacent LEDs 51 and 51 has a high light reflectivity by the first reflecting portion 61 exhibiting white color.
  • the portion on the light emitting side has a low light reflectivity by the second reflecting portion 62 exhibiting a color having a lower reflectivity than white, so that the place where the LED 51 is disposed is bright, and the adjacent LEDs 51, 51 are light. It is possible to alleviate the phenomenon of darkening the space and suppress the occurrence of uneven brightness in the vicinity of the side end surface (light incident surface) 11a of the light guide plate 11.
  • the light reflected from the surface of the circuit board 50 on which such a side-view type LED 51 is mounted can be introduced into the side end surface (light incident surface) 11a of the light guide plate 11 as a uniform uniform as a whole, It is possible to prevent the in-plane distribution of the intensity of light emitted from the front surface (light emitting surface) 11b of the light guide plate 11 from becoming non-uniform.
  • FIG. 7 shows a schematic configuration of a circuit board 70 according to a modification.
  • the first reflecting part 61 formed in the area between the adjacent LEDs 51 and 51 exhibits white color
  • the second reflecting part 72 formed in the area mainly emitting light of each LED 51 is It is black.
  • the 2nd reflection part 72 is formed so that black may be exhibited by printing black resist etc. in a substantially trapezoid.
  • the 2nd reflection part 72 since the 2nd reflection part 72 exhibits black, it can absorb the light which returns to the circuit board 70 from the light-guide plate 11, etc., and can hardly reflect it, Therefore
  • FIG. 8A shows a circuit board 80 according to the third embodiment.
  • the circuit board 80 includes a first reflecting portion 81 and a second reflecting portion 82 so that the mounted LED can be applied to any type of LEDs 21 and 51 of a top view type or a side view type. Is formed.
  • the first reflecting portion 81 is formed in a rectangular shape in the region between the adjacent LEDs 21 (51) and 21 (51), and surrounds each LED 21 (51) around each LED 21 (51).
  • a rectangular second reflecting portion 82 is formed.
  • FIG. 8B shows a circuit board 90 according to the fourth embodiment.
  • the circuit board 90 includes a first reflecting portion 91 and a second reflecting portion 92 so that the mounted LED can be applied to any of the top view type and side view type LEDs 21 and 51. Is formed.
  • the first reflecting portion 92 is formed in a rectangular shape so as to surround all the LEDs 21 (51) from the leftmost LED 21 (51) to the rightmost LED 21 (51).
  • first reflective portions 91 are formed on the left side of the leftmost LED 21 (51) and the right side of the rightmost LED 21 (51), that is, on both ends of the circuit board 90.
  • Such a configuration lowers the reflectance of light from the area where all the LEDs 21 (51) are arranged on the surface of the circuit board 90, and both ends of the circuit board 90 where the LEDs 21 (51) are not arranged. This can be applied when it is desired to increase the reflectance of light from the light source.
  • the present invention is not limited to these embodiments, and can be variously modified without departing from the gist of the present invention. Of course, it can be implemented.
  • the color of the first reflection part is not limited to white, but yellow or the like can be applied.
  • the color of the second reflection part may be any color that has a lower reflectance than the first reflection part.
  • the reflectance of the light of the second reflector is lower than the reflectance of the light of the first reflector, in other words, the reflectance of the light of the first reflector is higher than the reflectance of the light of the second reflector. What is necessary is just to select suitably the color which a 1st reflection part exhibits, and the color which a 2nd reflection part exhibits so that it may become a structure.
  • the circuit board on which the LED is mounted is shown so as to face one short side of the light guide plate having a rectangular shape, the number of circuit boards installed can be changed as appropriate.
  • the circuit board may be arranged so as to face each of a pair of opposing long sides of the light guide plate, and the circuit board faces each of one long side and one short side of the light guide plate.
  • the circuit board may be arranged to face each of the four sides of the light guide plate, and is not limited to the above-described embodiment.

Abstract

Provided is an illuminating device that is capable of suppressing uneven in-plane distribution of the intensity of light emitted from the front of a light-guiding panel. This illuminating device (4) has a platy light-guiding panel (11) and a circuit board (20) that is formed into a horizontally long rectangular shape and mounted with a plurality of LEDs (21) that emit light to a side surface (11a) of the light-guiding plate (11). On the surface of the circuit board (20) where the LEDs (21) are mounted, a first reflective section (31) is formed in the area between adjoining LEDS (21, 21), and a second reflective section (32) having lower light reflectance than the first reflective section (31) is formed in a predetermined area around each LED (21).

Description

照明装置およびこれを備えた液晶表示装置LIGHTING DEVICE AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME
　本発明は、液晶テレビ等の光源として用いられる照明装置およびその照明装置を備えた液晶表示装置に関し、更に詳しくは複数のＬＥＤが実装された回路基板を備えた照明装置およびその照明装置を備えた液晶表示装置に関する。 The present invention relates to an illuminating device used as a light source for a liquid crystal television or the like and a liquid crystal display device including the illuminating device, and more specifically, an illuminating device including a circuit board on which a plurality of LEDs are mounted and the illuminating device. The present invention relates to a liquid crystal display device.
　近年、コンピュータやテレビなどの家電製品の表示部として、液晶表示装置が広く用いられている。一般的な液晶表示装置は、液晶表示パネルと、その液晶表示パネルに光を照射するようにその背面側に配される照明装置（バックライト装置）を備えている。この種の照明装置としては、導光板と、この導光板の一辺または複数の辺に沿って配置される光源とを備えるサイドライト型（エッジライト型）の照明装置が知られている。このようなサイドライト型の照明装置は、光源が液晶表示パネルの背面に配設される直下型の照明装置と比べて、薄型化し易い等の利点を有している。 In recent years, liquid crystal display devices have been widely used as display units for home appliances such as computers and televisions. A general liquid crystal display device includes a liquid crystal display panel and an illumination device (backlight device) disposed on the back side of the liquid crystal display panel so as to irradiate the liquid crystal display panel with light. As this type of illumination device, a sidelight type (edge light type) illumination device including a light guide plate and a light source disposed along one or a plurality of sides of the light guide plate is known. Such a sidelight type illuminating device has advantages such as being easily reduced in thickness as compared with a direct type illuminating device in which a light source is disposed on the back surface of a liquid crystal display panel.
　特に、このようなサイドライト型の照明装置の光源としてＬＥＤ（発光ダイオード）を用いたものは、長寿命、高発光効率の利点を有しているため、特に注目されている。図９および図１０は、このようなＬＥＤを用いたサイドライト型の照明装置を備えた液晶表示装置の概略構成を示した分解斜視図および要部の断面図である。 Particularly, those using LEDs (light emitting diodes) as the light source of such a sidelight type lighting device are particularly attracting attention because they have advantages of long life and high luminous efficiency. FIG. 9 and FIG. 10 are an exploded perspective view and a cross-sectional view of the main part showing a schematic configuration of a liquid crystal display device provided with a sidelight type illumination device using such LEDs.
　図示されるように液晶表示装置１００は、ベゼル１０２、液晶表示パネル１０３、および照明装置１０４を備える。 As illustrated, the liquid crystal display device 100 includes a bezel 102, a liquid crystal display panel 103, and a lighting device 104.
　ベゼル１０２は、液晶表示パネル１０３の周縁に被せられる額縁形状を有しており、シャーシ１１４と共に液晶表示装置１００全体の強度を確保するものである。液晶表示パネル１０３は、２枚のガラスを貼り合わせてその間に液晶を封止したもので、前面に画像を表示することができるようになっている。 The bezel 102 has a frame shape that covers the periphery of the liquid crystal display panel 103, and ensures the strength of the entire liquid crystal display device 100 together with the chassis 114. The liquid crystal display panel 103 is formed by bonding two pieces of glass and sealing the liquid crystal therebetween, so that an image can be displayed on the front surface.
　照明装置１０４は、浅底の箱形状を有するシャーシ１１４を備えており、このシャーシ１１４の四角形状の底板部１１４ａ上には、光学シート１０７～１０９、導光板１１１、反射シート１１０および回路基板１２０が収納されている。 The illumination device 104 includes a chassis 114 having a shallow box shape. On the rectangular bottom plate portion 114a of the chassis 114, the optical sheets 107 to 109, the light guide plate 111, the reflection sheet 110, and the circuit board 120 are provided. Is stored.
　図１０に示されるように、導光板１１１は、回路基板１２０が備えるＬＥＤ１２１からの光を導入するための光入射面１１１ａと、その光入射面１１１ａから導入された光を上方向（照射方向）に出射するための光出射面１１１ｂとを有している。光入射面１１１ａは、導光板１１１の所定の側端面によって構成されると共に、光出射面１１１ｂは導光板１１１の前面によって構成されている。 As shown in FIG. 10, the light guide plate 111 has a light incident surface 111a for introducing light from the LEDs 121 included in the circuit board 120, and the light introduced from the light incident surface 111a upward (irradiation direction). And a light emitting surface 111b for emitting the light. The light incident surface 111 a is configured by a predetermined side end surface of the light guide plate 111, and the light emitting surface 111 b is configured by the front surface of the light guide plate 111.
　反射シート１１０は、導光板１１１の光出射面１１１ｂとは反対側の背面１１１ｃを覆うように配置されている。また、光学シート１０７～１０９は、拡散シートやレンズシートなどを含んでいると共に、導光板１１１の光出射面１１１ｂの上に配置されている。これら、光学シート１０７～１０９、導光板１１１、反射シート１１０は、フレーム１０５によってシャーシ１１４の底板部１１４ａ上に、積層された状態で固定されている。 The reflection sheet 110 is disposed so as to cover the back surface 111c of the light guide plate 111 opposite to the light emitting surface 111b. The optical sheets 107 to 109 include a diffusion sheet, a lens sheet, and the like, and are disposed on the light emitting surface 111b of the light guide plate 111. The optical sheets 107 to 109, the light guide plate 111, and the reflection sheet 110 are fixed in a stacked state on the bottom plate portion 114a of the chassis 114 by the frame 105.
　また、回路基板１２０の長手方向に沿って直線状に配置された複数のＬＥＤ１２１は、導光板１１１の光入射面１１１ａの近傍に配置されている。更に、ＬＥＤ１２１の発光面１２１ａが導光板１１１の光入射面１１１ａに対向するように、その光入射面１１１に沿って所定の間隔を隔てて配置されている。この場合、回路基板１２０は、シャーシ１１４の側板部１１４ｂに沿って立てた状態（起立した状態）になるように配設されている。尚、本発明に関連する先行技術文献としては下記特許文献が挙げられる。 Further, the plurality of LEDs 121 arranged linearly along the longitudinal direction of the circuit board 120 are arranged in the vicinity of the light incident surface 111 a of the light guide plate 111. Further, the light emitting surface 121 a of the LED 121 is disposed at a predetermined interval along the light incident surface 111 so as to face the light incident surface 111 a of the light guide plate 111. In this case, the circuit board 120 is disposed so as to stand (stand up) along the side plate portion 114b of the chassis 114. In addition, the following patent document is mentioned as a prior art document relevant to this invention.
特開２００６－１８９５１９号公報JP 2006-189519 A
　近年、このような回路基板１２０の製作かかるコストの削減やＬＥＤ１２１の消費電流の低減の観点から、回路基板１２０に実装されるＬＥＤ１２１の個数を減らすことが検討されている。しかしながら、実装されているＬＥＤ１２１の個数を減らすと、その分、隣り合うＬＥＤ１２１，１２１間の距離（ピッチ）が長くなってしまい、これが原因で、図１１に示すような導光板１１１の側端面（光入射面）１１１ａの近傍における明るさのムラ１３０が目立つようになる。 In recent years, it has been studied to reduce the number of LEDs 121 mounted on the circuit board 120 from the viewpoint of reducing the cost of manufacturing the circuit board 120 and reducing the current consumption of the LEDs 121. However, when the number of mounted LEDs 121 is reduced, the distance (pitch) between the adjacent LEDs 121 and 121 is increased correspondingly, and this causes the side end face of the light guide plate 111 as shown in FIG. Brightness unevenness 130 in the vicinity of the light incident surface 111a becomes conspicuous.
　つまり、隣り合うＬＥＤ１２１，１２１間の距離を長くなると、ＬＥＤ１２１が配置されているところが明るく、隣り合うＬＥＤ１２１，１２１間が暗くなる現象が顕著に生じてしまい、これが導光板１１１において明るさのムラ１３０となって視認されてしまう。このような明るさのムラ１３０が発生すると、導光板１１１の前面（光出射面）１１１ｂから出射される光の強度の面内分布が不均一になって、その結果、液晶表示パネル１０３で表示される画像に輝度ムラが発生してしまうという問題がある。 In other words, when the distance between the adjacent LEDs 121 and 121 is increased, a phenomenon in which the LED 121 is disposed brightly and the adjacent LED 121 and 121 are darkened occurs significantly. It will be visually recognized. When such brightness unevenness 130 occurs, the in-plane distribution of the intensity of light emitted from the front surface (light emitting surface) 111b of the light guide plate 111 becomes uneven, and as a result, the liquid crystal display panel 103 displays the light. There is a problem that uneven brightness occurs in the image to be displayed.
　そこで、本発明が解決しようとする課題は、導光板の前面から出射される光の強さの面内分布が不均一になることを抑制することが可能な照明装置およびこれを備えた液晶表示装置を提供することである。 Therefore, the problem to be solved by the present invention is an illumination device capable of suppressing the in-plane distribution of the intensity of light emitted from the front surface of the light guide plate and a liquid crystal display including the same. Is to provide a device.
　上記課題を解決するため本発明は、板状の導光板と、前記導光板の側端面に光を照射する複数のＬＥＤが実装された横長の長方形状を有する回路基板とを備えた照明装置であって、前記回路基板の前記ＬＥＤが実装される側の表面において、所定の領域には第１反射部が形成されると共に、前記第１反射部以外の領域には該第１反射部より光の反射率が低い第２反射部が形成されていることを要旨とするものである。 In order to solve the above-described problems, the present invention provides a lighting device including a plate-shaped light guide plate and a horizontally long circuit board on which a plurality of LEDs that irradiate light are mounted on the side end surfaces of the light guide plate. In addition, on the surface of the circuit board on the side where the LED is mounted, a first reflecting portion is formed in a predetermined region, and light is emitted from the first reflecting portion in a region other than the first reflecting portion. The gist of the present invention is that a second reflecting portion having a low reflectance is formed.
　このような構成によれば、上述した導光板の側端面（光入射面）近傍における明るさのムラの発生を抑制するように、回路基板のＬＥＤが実装される側の表面に光の反射率が異なる第１反射部および第２反射部を形成することで、回路基板の表面から反射される光を全体として均一なものとして導光板の側端面（光入射面）に導入することができ、導光板の前面（光出射面）から出射される光の強さの面内分布が不均一になることを抑制することが可能になる。 According to such a configuration, the reflectance of light on the surface of the circuit board on which the LEDs are mounted so as to suppress the occurrence of uneven brightness in the vicinity of the side end surface (light incident surface) of the light guide plate described above. By forming the first reflection part and the second reflection part different from each other, the light reflected from the surface of the circuit board can be introduced into the side end face (light incident face) of the light guide plate as a uniform uniform as a whole, It is possible to suppress the in-plane distribution of the intensity of light emitted from the front surface (light emitting surface) of the light guide plate from becoming non-uniform.
　この場合、前記第１反射部は、隣り合う前記ＬＥＤ間に配されると共に、前記第２反射部は、前記各ＬＥＤの周りに配されている構成にするのが好ましい。 In this case, it is preferable that the first reflecting portion is arranged between the adjacent LEDs, and the second reflecting portion is arranged around each LED.
　このような構成によれば、回路基板のＬＥＤが実装されている側の表面において、隣り合うＬＥＤ間の表面部分は、第１反射部によって光の反射率が高くされ、各ＬＥＤの周りの表面部分は、第１反射部よりも反射率が低い第２反射部によって光の反射率が低くされているので、ＬＥＤが配置されているところが明るく、隣り合うＬＥＤ間が暗くなる現象を緩和して導光板の側端面（光入射面）近傍における明るさのムラの発生を抑制することが可能である。したがって、回路基板の表面から反射される光を全体として均一なものとして導光板の側端面（光入射面）に導入することができ、導光板の前面（光出射面）から出射される光の強さの面内分布が不均一になることを抑制することが可能になる。 According to such a configuration, on the surface of the circuit board on the side where the LEDs are mounted, the surface portion between the adjacent LEDs has a high light reflectance by the first reflecting portion, and the surface around each LED. Since the light reflectance is lowered by the second reflecting portion having a reflectance lower than that of the first reflecting portion, the portion is lightened where the LEDs are arranged and the phenomenon of darkening between adjacent LEDs is alleviated. It is possible to suppress the occurrence of uneven brightness in the vicinity of the side end surface (light incident surface) of the light guide plate. Therefore, the light reflected from the surface of the circuit board can be introduced into the side end surface (light incident surface) of the light guide plate as uniform as a whole, and the light emitted from the front surface (light output surface) of the light guide plate can be introduced. It is possible to suppress unevenness of the in-plane distribution of strength.
　また、このような、第１反射部が隣り合うＬＥＤ間に配されると共に、第２反射部が各ＬＥＤの周りに配されている構成において、前記ＬＥＤは、その発光面が実装面の反対面であるトップビュータイプのＬＥＤである場合には、前記第２反射部は、平面で視て略楕円形を有している構成や、前記ＬＥＤは、その発光面が実装面と直交するサイドビュータイプのＬＥＤである場合には、前記第２反射部は、平面で視て前記ＬＥＤの光の出射側に向かって幅広の略台形を有している構成にするのが好ましい。 Further, in such a configuration in which the first reflecting portion is disposed between adjacent LEDs and the second reflecting portion is disposed around each LED, the light emitting surface of the LED is opposite to the mounting surface. In the case of a top-view type LED that is a surface, the second reflecting portion has a substantially elliptical shape when viewed in plan, or the LED has a side where the light emitting surface is orthogonal to the mounting surface. In the case of a view-type LED, it is preferable that the second reflecting portion has a substantially trapezoidal shape that is wide toward the light emission side of the LED when viewed in plan.
　更に、前記第１反射部は、前記回路基板の端部に配されている構成にしても良い。このような構成によれば、通常、ＬＥＤが配置されていない回路基板の端部における光の反射率を第１反射部によって高くし、ＬＥＤが配置されている領域における光の反射率を第２反射部によって低くすることで、回路基板の端部に対向する導光板の側端面にムラが発生することを抑制することが可能である。 Furthermore, the first reflection part may be arranged at the end of the circuit board. According to such a configuration, normally, the reflectance of light at the end of the circuit board where the LED is not disposed is increased by the first reflecting portion, and the reflectance of light in the region where the LED is disposed is second. By making it low by the reflection portion, it is possible to suppress the occurrence of unevenness on the side end surface of the light guide plate facing the end portion of the circuit board.
　このような第１反射部としては、白色を呈しているものが例示され、第２反射部としては、緑色や黒色などが例示される。 Such a first reflecting portion is exemplified by white, and the second reflecting portion is exemplified by green or black.
　特に、第２反射部が緑色を呈している構成にすれば、回路基板の配線を保護・絶縁するために回路基板表面に印刷されるソルダーレジストの色として一般的に採用されている緑色（白色よりも光の反射率が低い色）を、第２反射部の色として適用できるので、第２反射部として特に色を付与する必要がなく、このような回路基板の製作にかかるコストの低減を図ることができる。 In particular, if the second reflecting portion is configured to exhibit a green color, a green (white) color generally adopted as a solder resist color printed on the surface of the circuit board in order to protect and insulate the wiring of the circuit board. Can be applied as the color of the second reflecting part, so that it is not necessary to give a color as the second reflecting part, and the cost for manufacturing such a circuit board can be reduced. Can be planned.
　更に、第２反射部が黒色を呈している構成にすれば、導光板などから回路基板に戻ってくる光を吸収してほとんど反射させないようにすることができるので、ＬＥＤが配置されているところが明るく、隣り合うＬＥＤ間が暗くなる現象などを緩和して上述した明るさのムラの発生をより抑制することが可能である。 Furthermore, if the second reflecting portion is black, the light returning from the light guide plate or the like to the circuit board can be absorbed and hardly reflected, so the LED is disposed. It is possible to alleviate the phenomenon of the brightness unevenness described above by reducing the phenomenon of bright and darkening between adjacent LEDs.
　尚、第１反射部の色は白色に限らず、黄色なども適用でき、更には、第２反射部の色は第１反射部よりも反射率が低い色であれば良い。要は、第１反射部の光の反射率よりも第２反射部の光の反射率が低い、言い換えると第２反射部の光の反射率よりも第１反射部の光の反射率が高い構成となるように、第１反射部が呈する色および第２反射部が呈する色を適宜選択すれば良い。 It should be noted that the color of the first reflecting part is not limited to white, but yellow or the like can be applied. Furthermore, the color of the second reflecting part may be any color that has a lower reflectance than the first reflecting part. In short, the reflectance of the light of the second reflector is lower than the reflectance of the light of the first reflector, in other words, the reflectance of the light of the first reflector is higher than the reflectance of the light of the second reflector. What is necessary is just to select suitably the color which a 1st reflection part exhibits, and the color which a 2nd reflection part exhibits so that it may become a structure.
　また、上記課題を解決するために、本発明に係る液晶表示装置は、このような照明装置と、その照明装置からの光を利用して表示を行う液晶表示パネルとを備えることを要旨とするものである。このような液晶表示装置によれば、液晶表示パネルの背面側に照射される光の強さの面内分布が不均一になることが抑制されているので、表示品質の低下が防止または抑制された画像表示を実現することができる。 Moreover, in order to solve the said subject, the liquid crystal display device which concerns on this invention makes it a summary to provide such an illuminating device and the liquid crystal display panel which performs a display using the light from the illuminating device. Is. According to such a liquid crystal display device, since the in-plane distribution of the intensity of light applied to the back side of the liquid crystal display panel is suppressed, deterioration in display quality is prevented or suppressed. Image display can be realized.
　本発明によれば、導光板の前面から出射される光の強さの面内分布が不均一になること防止されているので、表示品質の低下が防止また抑制された画像表示を実現することができる。 According to the present invention, since the in-plane distribution of the intensity of light emitted from the front surface of the light guide plate is prevented from being non-uniform, it is possible to realize an image display in which deterioration in display quality is prevented and suppressed. Can do.
本発明の第１の実施形態に係る液晶表示装置の概略構成を示した分解斜視図である。1 is an exploded perspective view showing a schematic configuration of a liquid crystal display device according to a first embodiment of the present invention. 図１の液晶表示装置の組み立て後の要部を拡大して示した断面図である。It is sectional drawing which expanded and showed the principal part after the assembly of the liquid crystal display device of FIG. 図１の回路基板の要部を拡大して示した図で、（ａ）は平面図、（ｂ）は断面図である。It is the figure which expanded and showed the principal part of the circuit board of FIG. 1, (a) is a top view, (b) is sectional drawing. 図３の回路基板の変形例を示した図で、（ａ）は平面図、（ｂ）は断面図である。4A and 4B are diagrams showing a modification of the circuit board in FIG. 3, in which FIG. 3A is a plan view and FIG. 本発明の第２の実施形態に係る液晶表示装置の要部を拡大して示した断面図である。It is sectional drawing which expanded and showed the principal part of the liquid crystal display device which concerns on the 2nd Embodiment of this invention. 図５の回路基板と導光板を背面側から視た平面図である。It is the top view which looked at the circuit board and light guide plate of FIG. 5 from the back side. 図６の回路基板の変形例を示した平面図である。It is the top view which showed the modification of the circuit board of FIG. （ａ）は本発明の第３の実施形態に係る回路基板を示した平面図、（ｂ）は本発明の第４の実施形態に係る回路基板を示した平面図である。(A) is the top view which showed the circuit board based on the 3rd Embodiment of this invention, (b) is the top view which showed the circuit board concerning the 4th Embodiment of this invention. 従来用いられてきた液晶表示装置の概略構成を示した分解斜視図である。It is the disassembled perspective view which showed schematic structure of the liquid crystal display device used conventionally. 図９の液晶表示装置の組み立て後の要部を拡大して示した断面図である。It is sectional drawing which expanded and showed the principal part after the assembly of the liquid crystal display device of FIG. 導光板の側端面近傍の明るさのムラを模式的に示した平面図である。It is the top view which showed typically the nonuniformity of the brightness near the side end surface of a light-guide plate.
　以下に、本発明に係る照明装置、液晶表示装置の実施の形態ついて、図面を参照して詳細に説明する。 Embodiments of a lighting device and a liquid crystal display device according to the present invention will be described below in detail with reference to the drawings.
　図１は、本発明の第１の実施形態に係る液晶表示装置を模式的に示した分解斜視図である。液晶表示装置１は、液晶表示パネル３と、この液晶表示パネル３に光を照射するための照明装置（バックライト装置）４とを備え、これらが枠状のベゼル２などにより一体的に保持されるようになっている。ベゼル２は、液晶表示パネル３の周縁に被せられる額縁形状を有しており、照明装置４が備えるシャーシ１４と共に液晶表示装置１全体の強度を確保するものである。 FIG. 1 is an exploded perspective view schematically showing a liquid crystal display device according to a first embodiment of the present invention. The liquid crystal display device 1 includes a liquid crystal display panel 3 and an illumination device (backlight device) 4 for irradiating the liquid crystal display panel 3 with light, and these are integrally held by a frame-like bezel 2 or the like. It has become so. The bezel 2 has a frame shape that covers the periphery of the liquid crystal display panel 3, and ensures the strength of the entire liquid crystal display device 1 together with the chassis 14 included in the illumination device 4.
　液晶表示パネル３は、平面に視て横長の長方形状を有している。この液晶表示パネル３は、薄膜トランジスタ（ＴＦＴ）アレイ基板とカラーフィルタ（ＣＦ）基板とからなる一対のガラス基板が所定の間隔を置いて平行に対向して貼り合わせられ、両ガラス基板間に液晶が封入された構成をなしている。 The liquid crystal display panel 3 has a horizontally long rectangular shape when viewed from above. In this liquid crystal display panel 3, a pair of glass substrates comprising a thin film transistor (TFT) array substrate and a color filter (CF) substrate are bonded together in parallel at a predetermined interval, and a liquid crystal is sandwiched between the glass substrates. It has an enclosed configuration.
　ＴＦＴアレイ基板には複数のＴＦＴおよび画素電極がマトリクス状に形成され、ＣＦ基板には複数の着色パターンがマトリクス状に形成されると共に、そのほぼ全面に共通電極が形成されており、これら画素電極と共通電極との間に印加する電圧を変化させて液晶を配向制御することで、画像を表示することができるようになっている。尚、液晶表示パネル３の表面と背面にはそれぞれ偏光板が配されている。 A plurality of TFTs and pixel electrodes are formed in a matrix on the TFT array substrate, and a plurality of colored patterns are formed in a matrix on the CF substrate, and a common electrode is formed on almost the entire surface. An image can be displayed by controlling the orientation of the liquid crystal by changing the voltage applied between the first electrode and the common electrode. A polarizing plate is disposed on each of the front and back surfaces of the liquid crystal display panel 3.
　照明装置４は、いわゆるサイドライト型（エッジライト型）の照明装置である。図示されるように照明装置４は、液晶表示パネル３側に向けて開口した開口部を有した略箱形のシャーシ１４と、シャーシ１４の開口部を覆うように配される光学シート７～９を備える。また、シャーシ１４の内部には、光源であるＬＥＤ（発光ダイオード）２１が複数実装された回路基板２０と、ＬＥＤ２１からの光を液晶表示パネル３側へと導く導光板１１と、この導光板１１の背面側に配される反射シート１０を備える。 The illumination device 4 is a so-called side light type (edge light type) illumination device. As shown in the drawing, the illumination device 4 includes a substantially box-shaped chassis 14 having an opening opened toward the liquid crystal display panel 3 side, and optical sheets 7 to 9 arranged so as to cover the opening of the chassis 14. Is provided. Further, inside the chassis 14, a circuit board 20 on which a plurality of LEDs (light emitting diodes) 21 that are light sources are mounted, a light guide plate 11 that guides light from the LEDs 21 to the liquid crystal display panel 3 side, and the light guide plate 11. The reflective sheet 10 distribute | arranged to the back side is provided.
　フレーム５は、光学シート７～９、導光板１１および反射シート１０を、この順番で上から積層させた状態でシャーシ１４に固定するためのものである。この場合、フレーム５は、導光板１１の外周端部に沿って延在する枠状（額縁状）に形成されており、光学シート７～９および導光板１１の外周端部をほぼ全周にわたって表側から押さえることが可能となっている。尚、フレーム５は、例えば白色の合成樹脂製とされ、遮光性を有するものである。また、フレーム５は、液晶表示パネル３の外周端部の背面を、その枠部５ａの上面で受けることが可能になっている。 The frame 5 is for fixing the optical sheets 7 to 9, the light guide plate 11 and the reflection sheet 10 to the chassis 14 in a state where they are laminated in this order from above. In this case, the frame 5 is formed in a frame shape (frame shape) extending along the outer peripheral end portion of the light guide plate 11, and the outer peripheral end portions of the optical sheets 7 to 9 and the light guide plate 11 extend over substantially the entire circumference. It can be pressed from the front side. The frame 5 is made of, for example, white synthetic resin and has a light shielding property. Further, the frame 5 can receive the back surface of the outer peripheral end portion of the liquid crystal display panel 3 by the upper surface of the frame portion 5a.
　シャーシ１４は、アルミなどからなる金属製の板材を折り曲げ加工等によって浅底の箱形状に成形されており、その内部に光学シート７～９、導光板１１、反射シート１０、回路基板２０を収容することができるようなっている。シャーシ１４は、平面に視て横長の長方形状を有した底板部１４ａと、この底板部１４ａの四辺の外縁から立ち上がる側板部１４ｂとから構成される。また、側板部１４ｂには、上述したフレーム５およびベゼル２がネジ止め可能とされている。 The chassis 14 is formed into a shallow box shape by bending a metal plate made of aluminum or the like, and accommodates the optical sheets 7 to 9, the light guide plate 11, the reflection sheet 10, and the circuit board 20 therein. You can do that. The chassis 14 includes a bottom plate portion 14a having a horizontally long rectangular shape when viewed from above and a side plate portion 14b rising from the outer edges of the four sides of the bottom plate portion 14a. Further, the above-described frame 5 and bezel 2 can be screwed to the side plate portion 14b.
　３枚の光学シート７～９は、平面に視て横長の長方形状を有した薄い樹脂製のシートで構成される。光学シート７～９は、導光板１１の表側（光出射側）に載せられて液晶表示パネル３と導光板１１との間に介在して配される。これら光学シート７～９としては、上から順に例えば、厚さが０．１～０．５ｍｍ程度の偏光選択性反射シート７、レンズシート８、拡散シート９が用いられている。 The three optical sheets 7 to 9 are composed of thin resin sheets having a horizontally long rectangular shape when seen in a plan view. The optical sheets 7 to 9 are placed on the front side (light emitting side) of the light guide plate 11 and are interposed between the liquid crystal display panel 3 and the light guide plate 11. As these optical sheets 7 to 9, for example, a polarization selective reflection sheet 7, a lens sheet 8 and a diffusion sheet 9 having a thickness of about 0.1 to 0.5 mm are used in order from the top.
　この場合、拡散シート９は、導光板１１から出射される光を拡散させることで、輝度分布を均一にするためのものである。レンズシート８は、拡散シート９から出射される光を集光することで、正面輝度を高めるためのものである。また、偏光選択性反射シート７は、レンズシート８から出射された光が液晶表示パネル３の背面に貼り付けられた図示しない偏光板に吸収されないように選択的に反射させるためのものである。 In this case, the diffusion sheet 9 is for making the luminance distribution uniform by diffusing the light emitted from the light guide plate 11. The lens sheet 8 is for increasing the front luminance by condensing the light emitted from the diffusion sheet 9. The polarization selective reflection sheet 7 is for selectively reflecting the light emitted from the lens sheet 8 so that the light is not absorbed by a polarizing plate (not shown) attached to the back surface of the liquid crystal display panel 3.
　導光板１１は、平面に視て横長の長方形状を有して、例えば厚さが３～４ｍｍ程度の透明な樹脂製の板で構成される。導光板１１は、ＬＥＤ２１からの光を導入するための光入射面１１ａと、その光入射面１１ａから導入された光を上方向（照射方向）に出射するための光出射面１１ｂとを有している。光入射面１１ａは、導光板１１の長辺側の側端面によって構成されると共に、光出射面１１ｂは導光板１１の前面によって構成されている。 The light guide plate 11 is formed of a transparent resin plate having a horizontally long rectangular shape in a plan view and having a thickness of about 3 to 4 mm, for example. The light guide plate 11 has a light incident surface 11a for introducing light from the LED 21 and a light emission surface 11b for emitting light introduced from the light incident surface 11a upward (irradiation direction). ing. The light incident surface 11 a is configured by the side end surface on the long side of the light guide plate 11, and the light output surface 11 b is configured by the front surface of the light guide plate 11.
　導光板１１は、光入射面１１ａから入射した光を光出射面（前面）１１ｂと、この光出射面１１ｂとは反対側の背面１１ｃとの間で繰り返し反射させて、その内部で平面状に広げることが可能になっている。図示しないが、導光板１１の背面１１ｃには、光入射面１１ａから入射した光を散乱させて光出射面１１ｂから出射させるための複数個の散乱部が形成されている。このような散乱部としては、白色顔料等を含む塗料を導光板１１の背面１１ｃに斑点状に印刷して形成されたものなどが適用される。 The light guide plate 11 reflects light incident from the light incident surface 11a repeatedly between the light emitting surface (front surface) 11b and the back surface 11c opposite to the light emitting surface 11b, and forms a planar shape inside the light guiding plate 11 It can be expanded. Although not shown, a plurality of scattering portions are formed on the back surface 11c of the light guide plate 11 to scatter light incident from the light incident surface 11a and emit the light from the light emitting surface 11b. As such a scattering part, what was formed by printing the coating material containing a white pigment etc. on the back surface 11c of the light-guide plate 11 in the shape of a spot is applied.
　回路基板２０に備えられた複数個のＬＥＤ２１は、導光板１１の光入射面１１ａの近傍に配置されている。ＬＥＤ２１は、例えば青色光を発生させるＬＥＤチップを、黄色蛍光体が混合された透明樹脂で密封したパッケージ構造を有しており、ＬＥＤ２１の発光面２１ａから白色光を放出することが可能となっている。ＬＥＤ２１は、その発光面２１ａが実装面の反対面であるいわゆるトップビュータイプのＬＥＤである。この場合、ＬＥＤ２１は、その発光面２１ａが導光板１１の光入射面１１ａに対向するように、その光入射面１１ａに沿って所定の間隔を隔てて配置されている。 The plurality of LEDs 21 provided on the circuit board 20 are disposed in the vicinity of the light incident surface 11 a of the light guide plate 11. The LED 21 has a package structure in which, for example, an LED chip that generates blue light is sealed with a transparent resin mixed with a yellow phosphor, and white light can be emitted from the light emitting surface 21a of the LED 21. Yes. The LED 21 is a so-called top view type LED having a light emitting surface 21a opposite to the mounting surface. In this case, the LEDs 21 are arranged at a predetermined interval along the light incident surface 11 a so that the light emitting surface 21 a faces the light incident surface 11 a of the light guide plate 11.
　反射シート１０は、導光板１１の光出射面１１ｂとは反対側の背面１１ｃを覆うように配置されており、この場合、シャーシ１４の底板部１４ａ上に敷かれている。この反射シート１０は、導光板１１の背面１１ｃから背面側へと出射される光を導光板１１側に反射させるためのもので、例えば厚さが０．１～２ｍｍ程度の白色の樹脂製のシートで構成される。この反射シート１０によって導光板１１の背面１１ｃから出射される光を導光板１１側に効率良く反射させその光の利用効率および導光板１１の光出射面１１ｂでの輝度が高められている。 The reflection sheet 10 is disposed so as to cover the back surface 11c of the light guide plate 11 opposite to the light emitting surface 11b. In this case, the reflection sheet 10 is laid on the bottom plate portion 14a of the chassis 14. The reflection sheet 10 is for reflecting light emitted from the back surface 11c of the light guide plate 11 to the back side toward the light guide plate 11, and is made of a white resin having a thickness of about 0.1 to 2 mm, for example. Consists of sheets. The light emitted from the back surface 11 c of the light guide plate 11 is efficiently reflected by the reflection sheet 10 toward the light guide plate 11, so that the light utilization efficiency and the luminance at the light output surface 11 b of the light guide plate 11 are enhanced.
　このように照明装置４は、光学シート７～９、導光板１１および反射シート１０によって、ＬＥＤ２１からの光を面状の光に変換して液晶表示パネル３の背面側に照射できるようになっている。尚、シャーシ４の背面には、回路基板２０に電源を供給する電源基板１８と、液晶表示パネル３を駆動するコントロール基板１９が配設されている。 As described above, the illumination device 4 can convert the light from the LED 21 into the planar light by the optical sheets 7 to 9, the light guide plate 11 and the reflection sheet 10 and irradiate the back side of the liquid crystal display panel 3. Yes. On the rear surface of the chassis 4, a power supply board 18 that supplies power to the circuit board 20 and a control board 19 that drives the liquid crystal display panel 3 are disposed.
　図１および図３に示されるように、回路基板２０の表面（ＬＥＤ２１が実装される側の面）において、隣り合うＬＥＤ２１，２１間の領域には白色を呈した第１反射部３１が形成されると共に、各ＬＥＤ２１の周りの所定の領域には第１反射部３１よりも光の反射率が低い色を呈した第２反射部３２が形成されている。 As shown in FIG. 1 and FIG. 3, a first reflecting portion 31 having a white color is formed in a region between adjacent LEDs 21 and 21 on the surface of the circuit board 20 (the surface on which the LED 21 is mounted). In addition, in a predetermined region around each LED 21, a second reflecting portion 32 having a color with a light reflectance lower than that of the first reflecting portion 31 is formed.
　第１反射部３１は、白色レジストなどを回路基板２０の表面に印刷（塗布）することにより白色を呈するように形成されている。また、第２反射部３２は、後述するソルダーレジストなどを回路基板２０の表面に印刷（塗布）することにより例えば白色よりも反射率が低い中間色として緑色を呈するように形成されている。 The first reflecting portion 31 is formed to have a white color by printing (coating) a white resist or the like on the surface of the circuit board 20. Moreover, the 2nd reflection part 32 is formed so that it may exhibit green as an intermediate color whose reflectance is lower than white by printing (application | coating) the soldering resist etc. which are mentioned later on the surface of the circuit board 20, for example.
　図３（ｂ）に示されるように、回路基板２０は、いわゆる電気回路をプリントして各種電気部品が実装される絶縁体２３などを備えている、この場合、横長の長方形状を有する絶縁体２３の上には、ＬＥＤ２１に電源（電力）を供給するための銅箔などからなる配線パターン２４が形成されており、この配線パターン２４によって複数のＬＥＤ２１が直列に接続されている。 As shown in FIG. 3B, the circuit board 20 includes an insulator 23 on which various electrical components are mounted by printing a so-called electrical circuit. In this case, the insulator has a horizontally long rectangular shape. A wiring pattern 24 made of copper foil or the like for supplying power (electric power) to the LED 21 is formed on the LED 23, and the plurality of LEDs 21 are connected in series by the wiring pattern 24.
　また、この配線パターン２４を含んで絶縁体２３上の全面を被覆するように、ソルダーレジスト２５が塗布されている。ソルダーレジスト２５は、配線パターン２４を保護および絶縁するためのもので、その色は、通常、検査工程等で作業者の目にやさしい等の理由により緑色のものが採用されている。このソルダーレジスト２５が呈する色は、緑色の他に、白色よりも反射率が低い中間色として茶色や灰色などが例示される。 Further, a solder resist 25 is applied so as to cover the entire surface of the insulator 23 including the wiring pattern 24. The solder resist 25 is used to protect and insulate the wiring pattern 24. The color of the solder resist 25 is usually green for reasons such as being easy on the eyes of the operator in the inspection process. Examples of the color exhibited by the solder resist 25 include green and brown or gray as an intermediate color having a lower reflectance than white.
　図３（ｂ）に示されるように、ソルダーレジスト２５には、下層の配線パターン２４の電極部２４ａが露出されるように開口部２５ａが形成されており、この開口部２５ａを利用して電極部２４ａがハンダ２６によってＬＥＤ２１に接続されている。 As shown in FIG. 3B, an opening 25a is formed in the solder resist 25 so that the electrode 24a of the lower wiring pattern 24 is exposed, and an electrode is formed using this opening 25a. The part 24 a is connected to the LED 21 by the solder 26.
　回路基板２０の表面（ＬＥＤ２１が実装されている側の面）、つまりソルダーレジスト２５の上面には、所定のパターンの白色レジスト２７が形成されている。この白色レジスト２７は、例えばスクリーン印刷方法によって形成されている。スクリーン印刷方法とは、所定のパターンの開口部が設けられたスクリーン版で、印刷対称を覆い、開口部からインクを付けて印刷する方法であり、印刷対称が平面でなく曲面であっても自由に印刷することができることから、回路基板の印刷方法として広く採用されている。尚、白色レジストの代わりに白色顔料等を含む塗料を用い、白色を呈する第１反射部３１を形成するようにしても良い。 A white resist 27 having a predetermined pattern is formed on the surface of the circuit board 20 (the surface on which the LED 21 is mounted), that is, the upper surface of the solder resist 25. The white resist 27 is formed by, for example, a screen printing method. The screen printing method is a method of printing with a screen plate provided with a predetermined pattern of openings, covering the printing symmetry and applying ink from the opening, and the printing symmetry is not flat but curved. Therefore, it is widely used as a circuit board printing method. In addition, the 1st reflection part 31 which exhibits white may be formed using the coating material containing a white pigment etc. instead of a white resist.
　この場合、ＬＥＤ２１の周りを略楕円形に囲むように白色レジスト２７が印刷されている。言い換えると、ＬＥＤ２１の周りを囲む楕円形（第２反射部３２）以外の回路基板２０の表面（ソルダーレジスト２５の上面）に白色レジスト２７が形成されて、この白色レジスト２７が、白色を呈した第１反射部３１を構成している。また、このような第１反射部３１（白色レジスト２７）によって覆われていないソルダーレジスト２５が、緑色（白色よりも光の反射率が低い色）を呈した第２反射部３２を構成している。 In this case, the white resist 27 is printed so as to surround the LED 21 in a substantially elliptical shape. In other words, the white resist 27 is formed on the surface of the circuit board 20 (the upper surface of the solder resist 25) other than the ellipse (second reflecting portion 32) surrounding the LED 21, and the white resist 27 exhibits white. The 1st reflection part 31 is comprised. In addition, the solder resist 25 that is not covered by the first reflecting portion 31 (white resist 27) constitutes the second reflecting portion 32 that exhibits green color (color having a lower light reflectance than white). Yes.
　このように回路基板２０の表面（ＬＥＤ２１が実装される側の面）において、隣り合うＬＥＤ２１，２１間の領域には白色を呈した第１反射部３１が形成されると共に、各ＬＥＤ２１の周りの所定の領域には第１反射部３１よりも光の反射率が低い色（例えば緑色などの中間色）を呈した第２反射部３２が形成されている。 Thus, on the surface of the circuit board 20 (surface on the side where the LED 21 is mounted), the first reflecting portion 31 exhibiting white is formed in the region between the adjacent LEDs 21 and 21, and the area around each LED 21 is In the predetermined region, a second reflecting portion 32 having a color (for example, an intermediate color such as green) having a light reflectance lower than that of the first reflecting portion 31 is formed.
　したがって、回路基板２０の表面において、隣り合うＬＥＤ２１，２１間の部分は、白色を呈する第１反射部３１によって光の反射率が高くされ、各ＬＥＤ２１の周りの部分は、白色よりも反射率が低い色を呈する第２反射部３２によって光の反射率が低くされている。これにより、ＬＥＤ２１が配置されているところが明るく、隣り合うＬＥＤ２１，２１間が暗くなる現象を緩和して、導光板１１の側端面（光入射面）１１ａ近傍における明るさのムラの発生が抑制されている。 Therefore, on the surface of the circuit board 20, the portion between the adjacent LEDs 21 and 21 has a high light reflectance by the first reflecting portion 31 that exhibits white, and the portion around each LED 21 has a reflectance higher than that of white. The light reflectance is lowered by the second reflecting portion 32 exhibiting a low color. As a result, the phenomenon in which the LED 21 is arranged is bright and the darkness between the adjacent LEDs 21 and 21 is alleviated, and the occurrence of uneven brightness in the vicinity of the side end surface (light incident surface) 11a of the light guide plate 11 is suppressed. ing.
　つまり、このような第１反射部３１および第２反射部３２を設けることで、回路基板２０の表面から反射される光を全体として均一なものとして導光板１１の側端面（光入射面）１１ａに導入することができ、導光板の前面（光出射面）１１ｂから出射される光の強さの面内分布が不均一になることを抑制することが可能になる。 That is, by providing the first reflecting portion 31 and the second reflecting portion 32 as described above, the light reflected from the surface of the circuit board 20 is made uniform as a whole, and the side end surface (light incident surface) 11a of the light guide plate 11 is made. It is possible to prevent the in-plane distribution of the intensity of light emitted from the front surface (light emitting surface) 11b of the light guide plate from becoming uneven.
　尚、上述した回路基板２０において、ソルダーレジスト２５を廃止し、第１反射部３１である白色レジスト２７が、配線パターン２４を保護および絶縁するためとして用いられる構成にしても良い。ソルダーレジスト２５の廃止によって、回路基板２０の製作にかかるコストを低減することができる。このような場合は、第２反射部３２の色は、ソルダーレジスト３５の廃止によって、絶縁体２３自体の色や配線パターン２４の色を呈することになるが、これらの色が白色よりも反射率が低いものであれば良い。 In the circuit board 20 described above, the solder resist 25 may be eliminated, and the white resist 27 that is the first reflecting portion 31 may be used to protect and insulate the wiring pattern 24. By eliminating the solder resist 25, the cost for manufacturing the circuit board 20 can be reduced. In such a case, the color of the second reflecting portion 32 exhibits the color of the insulator 23 itself and the color of the wiring pattern 24 due to the abolition of the solder resist 35, but these colors are more reflective than white. As long as the value is low.
　次に、上述した第１の実施形態に係る回路基板２０の変形例について説明する。図４は変形例に係る回路基板４０の概略構成を示している。図示されるように、回路基板４０の表面において、隣り合うＬＥＤ２１，２１間の領域に形成される第１反射部３１は、白色を呈すると共に、各ＬＥＤ２１を囲む領域に形成される第２反射部４２は黒色を呈している。この場合、第２反射部４２は、ソルダーレジスト２７の上に、黒色レジスト４３を楕円形に印刷することにより黒色を呈するように形成されている。尚、第２反射部４２は、上述したスクリーン印刷方法などを用いることによって簡便に形成することができる。また、黒色レジストの代わりに黒色顔料等を含む塗料を用い、黒色を呈する第２反射部４２を形成するようにしても良い。 Next, a modification of the circuit board 20 according to the first embodiment described above will be described. FIG. 4 shows a schematic configuration of a circuit board 40 according to a modification. As shown in the drawing, on the surface of the circuit board 40, the first reflecting portion 31 formed in the region between the adjacent LEDs 21 and 21 is white, and the second reflecting portion is formed in the region surrounding each LED 21. 42 is black. In this case, the second reflecting portion 42 is formed on the solder resist 27 so as to exhibit a black color by printing the black resist 43 in an oval shape. In addition, the 2nd reflection part 42 can be simply formed by using the screen printing method etc. which were mentioned above. Alternatively, the second reflecting portion 42 exhibiting black may be formed using a paint containing a black pigment or the like instead of the black resist.
　このように各ＬＥＤ２１を囲むように形成された第２反射部４２が黒色を呈することにより、この第２反射部４２に導光板１１などから回路基板２０に戻ってくる光を吸収してほとんど反射させないようにすることができる。したがって、ＬＥＤ２１が配置されているところが明るく、隣り合うＬＥＤ２１，２１間が暗くなる現象を更に緩和して、導光板１１の側端面（光入射面）１１ａ近傍における明るさのムラの発生を更に抑制することが可能である。 Thus, when the 2nd reflection part 42 formed so that it encloses each LED21 exhibits black, the light which returns to the circuit board 20 from the light-guide plate 11 etc. in this 2nd reflection part 42 is absorbed, and it reflects almost. You can avoid it. Therefore, the phenomenon in which the LED 21 is arranged brightly and the darkness between the adjacent LEDs 21 and 21 is further alleviated, and the occurrence of uneven brightness in the vicinity of the side end surface (light incident surface) 11a of the light guide plate 11 is further suppressed. Is possible.
　尚、上述した回路基板４０において、ソルダーレジスト２５を廃止し、第１反射部３１である白色レジスト２７と第２反射部４２である黒色レジスト４３が、配線パターン２４を保護および絶縁するためとして用いられる構成にしても良い。ソルダーレジスト２５の廃止によって、回路基板４０の製作にかかるコストを低減することができる。 In the circuit board 40 described above, the solder resist 25 is eliminated, and the white resist 27 as the first reflecting portion 31 and the black resist 43 as the second reflecting portion 42 are used for protecting and insulating the wiring pattern 24. It is also possible to adopt a configuration such as By eliminating the solder resist 25, the cost for manufacturing the circuit board 40 can be reduced.
　次に、本発明の第２の実施形態について説明する。尚、上述した第１の実施形態とほぼ同一の構成については同符号を付して説明は省略し、異なる点を中心に説明する。 Next, a second embodiment of the present invention will be described. In addition, about the structure substantially the same as 1st Embodiment mentioned above, the same code | symbol is attached | subjected and description is abbreviate | omitted and it demonstrates centering on a different point.
　図５は、第２の実施形態に係る液晶表示装置の要部を拡大して示した断面図、図６は、図５の回路基板と導光板を背面側から視た平面図である。 FIG. 5 is an enlarged cross-sectional view showing a main part of the liquid crystal display device according to the second embodiment, and FIG. 6 is a plan view of the circuit board and the light guide plate of FIG.
　図示されるように、回路基板５０に備えられるＬＥＤ５１は、その発光面５１ａが実装面と直交するサイドビュータイプのＬＥＤである。この場合、回路基板５０は、フレーム５の枠部５ａの背面に平行になるように配置されている。この回路基板５０は、図示しないが上述した第１の実施形態で説明した図３（ｂ）に示すような回路基板２０と同様の断面構造を有している。また、反射シート１０の端部がシャーシ１４の側板部１４ｂを覆うように延設されている。 As shown in the figure, the LED 51 provided on the circuit board 50 is a side view type LED whose light emitting surface 51a is orthogonal to the mounting surface. In this case, the circuit board 50 is disposed so as to be parallel to the back surface of the frame portion 5 a of the frame 5. Although not shown, the circuit board 50 has the same cross-sectional structure as the circuit board 20 shown in FIG. 3B described in the first embodiment. Further, the end of the reflection sheet 10 is extended so as to cover the side plate portion 14 b of the chassis 14.
　図６に示されるように、回路基板５０の表面（ＬＥＤ５１が実装される側の面）において、隣り合うＬＥＤ５１，５１間の領域には白色を呈した第１反射部６１が形成されると共に、各ＬＥＤ５１の周りの所定の領域には第１反射部６１よりも光の反射率が低い色を呈した第２反射部６２が形成されている。 As shown in FIG. 6, on the surface of the circuit board 50 (the surface on the side where the LED 51 is mounted), a first reflecting portion 61 having a white color is formed in a region between the adjacent LEDs 51, 51, In a predetermined region around each LED 51, a second reflecting portion 62 having a color with a light reflectance lower than that of the first reflecting portion 61 is formed.
　第１反射部６１は、白色レジストなどを回路基板５０の表面に印刷（塗布）することにより白色を呈するように形成されている。また、第２反射部６２は、ソルダーレジストなどを回路基板５０の表面に印刷（塗布）することにより例えば白色よりも反射率が低い中間色として緑色を呈するように形成されている。この場合、第２反射部６２は、平面で視てＬＥＤ５１の発光面５１ａからの光の出射側に向かって幅広の略台形を有している。 The first reflecting portion 61 is formed to have a white color by printing (coating) a white resist or the like on the surface of the circuit board 50. Moreover, the 2nd reflection part 62 is formed so that green may be exhibited as an intermediate color whose reflectance is lower than white by printing (application | coating) a soldering resist etc. on the surface of the circuit board 50, for example. In this case, the second reflecting portion 62 has a substantially trapezoidal shape that is wide toward the light emission side from the light emitting surface 51a of the LED 51 when viewed in plan.
　このように回路基板５０のＬＥＤ５１が実装されている側の表面において、隣り合うＬＥＤ５１，５１間の部分は、白色を呈する第１反射部６１によって光の反射率が高くされ、各ＬＥＤ５１の主に光を出射する側における部分は、白色よりも反射率が低い色を呈する第２反射部６２によって光の反射率が低くされているので、ＬＥＤ５１が配置されているところが明るく、隣り合うＬＥＤ５１，５１間が暗くなる現象を緩和して、導光板１１の側端面（光入射面）１１ａ近傍における明るさのムラの発生を抑制することが可能である。 In this way, on the surface of the circuit board 50 on the side where the LEDs 51 are mounted, the portion between the adjacent LEDs 51 and 51 has a high light reflectivity by the first reflecting portion 61 exhibiting white color. The portion on the light emitting side has a low light reflectivity by the second reflecting portion 62 exhibiting a color having a lower reflectivity than white, so that the place where the LED 51 is disposed is bright, and the adjacent LEDs 51, 51 are light. It is possible to alleviate the phenomenon of darkening the space and suppress the occurrence of uneven brightness in the vicinity of the side end surface (light incident surface) 11a of the light guide plate 11.
　したがって、このようなサイドビュータイプのＬＥＤ５１が実装された回路基板５０の表面から反射される光を全体として均一なものとして導光板１１の側端面（光入射面）１１ａに導入することができ、導光板１１の前面（光出射面）１１ｂから出射される光の強さの面内分布が不均一になることを抑制することが可能になる。 Therefore, the light reflected from the surface of the circuit board 50 on which such a side-view type LED 51 is mounted can be introduced into the side end surface (light incident surface) 11a of the light guide plate 11 as a uniform uniform as a whole, It is possible to prevent the in-plane distribution of the intensity of light emitted from the front surface (light emitting surface) 11b of the light guide plate 11 from becoming non-uniform.
　次に、上述した第２の実施形態に係る回路基板５０の変形例について説明する。図７は変形例に係る回路基板７０の概略構成を示している。図示されるように、隣り合うＬＥＤ５１，５１間の領域に形成される第１反射部６１は、白色を呈すると共に、各ＬＥＤ５１の主に光を出射する領域に形成される第２反射部７２は黒色を呈している。この場合、第２反射部７２は、黒色レジストなどを略台形に印刷することにより黒色を呈するように形成されている。 Next, a modification of the circuit board 50 according to the second embodiment described above will be described. FIG. 7 shows a schematic configuration of a circuit board 70 according to a modification. As shown in the drawing, the first reflecting part 61 formed in the area between the adjacent LEDs 51 and 51 exhibits white color, and the second reflecting part 72 formed in the area mainly emitting light of each LED 51 is It is black. In this case, the 2nd reflection part 72 is formed so that black may be exhibited by printing black resist etc. in a substantially trapezoid.
　このように第２反射部７２は黒色を呈することにより、導光板１１などから回路基板７０に戻ってくる光を吸収してほとんど反射させないようにすることができるので、ＬＥＤ５１が配置されているところが明るく、隣り合うＬＥＤ５１，５１間が暗くなる現象をより緩和して、導光板の側端面（光入射面）近傍における明るさのムラの発生をより抑制することが可能である。 Thus, since the 2nd reflection part 72 exhibits black, it can absorb the light which returns to the circuit board 70 from the light-guide plate 11, etc., and can hardly reflect it, Therefore The place where LED51 is arrange | positioned. It is possible to further alleviate the phenomenon of bright and darkening between adjacent LEDs 51 and 51, and to further suppress the occurrence of uneven brightness in the vicinity of the side end surface (light incident surface) of the light guide plate.
　次に、本発明の第３の実施形態および第４の実施形態について説明する。尚、上述した第１の実施形態（変形例も含む）および第２の実施形態（変形例も含む）とほぼ同一の構成については同符号を付して説明は省略し、異なる点を中心に説明する。 Next, a third embodiment and a fourth embodiment of the present invention will be described. In addition, about the structure substantially the same as 1st Embodiment (a modification is also included) and 2nd Embodiment (a modification is included) mentioned above, the same code | symbol is attached | subjected and description is abbreviate | omitted and it focuses on a different point. explain.
　図８（ａ）は、第３の実施形態に係る回路基板８０を示している。図示されるように、回路基板８０は、実装されるＬＥＤがトップビュータイプまたはサイドビュータイプのいずれのタイプのＬＥＤ２１，５１にも適用可能なように第１反射部８１と第２反射部８２が形成されている。この場合、第１反射部８１は、隣り合うＬＥＤ２１（５１），２１（５１）間の領域において長方形状に形成されると共に、各ＬＥＤ２１（５１）の周りには各ＬＥＤ２１（５１）を囲むような矩形状の第２反射部８２が形成されている。 FIG. 8A shows a circuit board 80 according to the third embodiment. As shown in the drawing, the circuit board 80 includes a first reflecting portion 81 and a second reflecting portion 82 so that the mounted LED can be applied to any type of LEDs 21 and 51 of a top view type or a side view type. Is formed. In this case, the first reflecting portion 81 is formed in a rectangular shape in the region between the adjacent LEDs 21 (51) and 21 (51), and surrounds each LED 21 (51) around each LED 21 (51). A rectangular second reflecting portion 82 is formed.
　図８（ｂ）は、第４の実施形態に係る回路基板９０を示している。図示されるように、回路基板９０は、実装されるＬＥＤがトップビュータイプまたはサイドビュータイプのいずれのタイプのＬＥＤ２１，５１にも適用可能なように第１反射部９１と第２反射部９２が形成されている。この場合、第１反射部９２は、左端のＬＥＤ２１（５１）から右端のＬＥＤ２１（５１）までの全てのＬＥＤ２１（５１）の周りを囲むように矩形状に形成されている。また、左端のＬＥＤ２１（５１）の左側部分および右端のＬＥＤ２１（５１）の右側部分、つまり回路基板９０の両端部に第１反射部９１が形成されている。このような構成は、回路基板９０の表面における全てのＬＥＤ２１（５１）が配置されている領域からの光の反射率を低くして、ＬＥＤ２１（５１）が配置されていない回路基板９０の両端部からの光の反射率を高くしたい場合に適用することができる。 FIG. 8B shows a circuit board 90 according to the fourth embodiment. As shown in the drawing, the circuit board 90 includes a first reflecting portion 91 and a second reflecting portion 92 so that the mounted LED can be applied to any of the top view type and side view type LEDs 21 and 51. Is formed. In this case, the first reflecting portion 92 is formed in a rectangular shape so as to surround all the LEDs 21 (51) from the leftmost LED 21 (51) to the rightmost LED 21 (51). In addition, first reflective portions 91 are formed on the left side of the leftmost LED 21 (51) and the right side of the rightmost LED 21 (51), that is, on both ends of the circuit board 90. Such a configuration lowers the reflectance of light from the area where all the LEDs 21 (51) are arranged on the surface of the circuit board 90, and both ends of the circuit board 90 where the LEDs 21 (51) are not arranged. This can be applied when it is desired to increase the reflectance of light from the light source.
　以上、本発明に係る照明装置および液晶表示装置の実施の形態について説明したが、本発明はこうした実施形態に何ら限定されるものではなく、本発明の要旨を逸脱しない範囲において、種々なる態様で実施できることは勿論である。 The embodiments of the illumination device and the liquid crystal display device according to the present invention have been described above. However, the present invention is not limited to these embodiments, and can be variously modified without departing from the gist of the present invention. Of course, it can be implemented.
　例えば、第１反射部の色は白色に限らず、黄色なども適用でき、更には、第２反射部の色は第１反射部よりも反射率が低い色であれば良い。要は、第１反射部の光の反射率よりも第２反射部の光の反射率が低い、言い換えると第２反射部の光の反射率よりも第１反射部の光の反射率が高い構成となるように、第１反射部が呈する色および第２反射部が呈する色を適宜選択すれば良い。 For example, the color of the first reflection part is not limited to white, but yellow or the like can be applied. Furthermore, the color of the second reflection part may be any color that has a lower reflectance than the first reflection part. In short, the reflectance of the light of the second reflector is lower than the reflectance of the light of the first reflector, in other words, the reflectance of the light of the first reflector is higher than the reflectance of the light of the second reflector. What is necessary is just to select suitably the color which a 1st reflection part exhibits, and the color which a 2nd reflection part exhibits so that it may become a structure.
　また、ＬＥＤが実装された回路基板を、長方形を有する導光板の１つの短辺に対向するように配したものを示したが、回路基板の設置数は適宜変更可能である。例えば、導光板の対向する一対の長辺のそれぞれに対向するように回路基板を配しても良く、また、回路基板を導光板の１つの長辺および１つの短辺のそれぞれ対向するように配しても良く、更に、回路基板を導光板の四辺それぞれに対向するように配しても良く、上述した実施の形態には限定されない。 Further, although the circuit board on which the LED is mounted is shown so as to face one short side of the light guide plate having a rectangular shape, the number of circuit boards installed can be changed as appropriate. For example, the circuit board may be arranged so as to face each of a pair of opposing long sides of the light guide plate, and the circuit board faces each of one long side and one short side of the light guide plate. Further, the circuit board may be arranged to face each of the four sides of the light guide plate, and is not limited to the above-described embodiment.

Claims (9)

  1. 　板状の導光板と、前記導光板の側端面に光を照射する複数のＬＥＤが実装された横長の長方形状を有する回路基板とを備えた照明装置であって、前記回路基板の前記ＬＥＤが実装される側の表面において、所定の領域には第１反射部が形成されると共に、前記第１反射部以外の領域には該第１反射部より光の反射率が低い第２反射部が形成されていることを特徴とする照明装置。 A lighting device comprising: a plate-shaped light guide plate; and a circuit board having a horizontally-long rectangular shape on which a plurality of LEDs that irradiate light on a side end surface of the light guide plate are mounted. On the surface on the mounting side, a first reflecting portion is formed in a predetermined region, and a second reflecting portion having a light reflectance lower than that of the first reflecting portion is provided in a region other than the first reflecting portion. A lighting device characterized by being formed.
  2. 　前記第１反射部は、隣り合う前記ＬＥＤ間に配されると共に、前記第２反射部は、前記各ＬＥＤの周りに配されていることを特徴とする請求項１に記載の照明装置。 The lighting device according to claim 1, wherein the first reflecting portion is disposed between the adjacent LEDs, and the second reflecting portion is disposed around each of the LEDs.
  3. 　前記ＬＥＤは、その発光面が実装面の反対面であるトップビュータイプのＬＥＤである場合には、前記第２反射部は、平面で視て略楕円形を有していることを特徴とする請求項２に記載の照明装置。 When the LED is a top view type LED whose light emitting surface is the opposite surface of the mounting surface, the second reflecting portion has a substantially elliptical shape when viewed in plan. The lighting device according to claim 2.
  4. 　前記ＬＥＤは、その発光面が実装面と直交するサイドビュータイプのＬＥＤである場合には、前記第２反射部は、平面で視て前記ＬＥＤの光の出射側に向かって幅広の略台形を有していることを特徴とする請求項２に記載の照明装置。 When the LED is a side view type LED whose light-emitting surface is orthogonal to the mounting surface, the second reflecting portion has a substantially trapezoidal shape that is wide toward the light emission side of the LED when viewed in plan. It has, The illuminating device of Claim 2 characterized by the above-mentioned.
  5. 　前記第１反射部は、前記回路基板の端部に配されていることを特徴とする請求項１に記載の照明装置。 The lighting device according to claim 1, wherein the first reflecting portion is disposed on an end portion of the circuit board.
  6. 　前記第１反射部は、白色を呈していることを特徴とする請求項１から５のいずれか一項に記載の照明装置。 The lighting device according to any one of claims 1 to 5, wherein the first reflecting portion is white.
  7. 　前記第２反射部は、緑色を呈していることを特徴とする請求項１から６のいずれか一項に記載の照明装置。 The lighting device according to any one of claims 1 to 6, wherein the second reflecting portion is green.
  8. 　前記第２反射部は、黒色を呈していることを特徴とする請求項１から６のいずれか一項に記載の照明装置。 The lighting device according to any one of claims 1 to 6, wherein the second reflecting portion is black.
  9. 　請求項１から８のいずれか一項に記載の照明装置と、前記照明装置からの光を利用して表示を行う液晶表示パネルとを備えることを特徴とする液晶表示装置。 A liquid crystal display device comprising: the lighting device according to claim 1; and a liquid crystal display panel that performs display using light from the lighting device.
PCT/JP2011/073660 2010-11-18 2011-10-14 Illuminating device and liquid crystal display device provided therewith WO2012066887A1 (en)

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