WO2012026164A1 - Dispositif d'éclairage, dispositif d'affichage - Google Patents

Dispositif d'éclairage, dispositif d'affichage Download PDF

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Publication number
WO2012026164A1
WO2012026164A1 PCT/JP2011/061390 JP2011061390W WO2012026164A1 WO 2012026164 A1 WO2012026164 A1 WO 2012026164A1 JP 2011061390 W JP2011061390 W JP 2011061390W WO 2012026164 A1 WO2012026164 A1 WO 2012026164A1
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WO
WIPO (PCT)
Prior art keywords
light
light guide
incident
led
incident surface
Prior art date
Application number
PCT/JP2011/061390
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English (en)
Japanese (ja)
Inventor
張　志芳
Original Assignee
シャープ株式会社
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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 WO2012026164A1 publication Critical patent/WO2012026164A1/fr

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    • 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
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • 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
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0078—Side-by-side arrangements, e.g. for large area displays

Definitions

  • the present invention relates to an illuminating device and a display device, and more particularly to an illuminating device equipped with a light guide for guiding light and a display device including the illuminating device.
  • a backlight unit for supplying light is usually mounted on the liquid crystal display panel.
  • the backlight unit is preferably configured to generate planar light that spreads over the entire area of the planar liquid crystal display panel. Therefore, the backlight unit mounted on the liquid crystal display device may include a light guide plate (light guide) for mixing the light of the built-in light source to a high degree.
  • an edge light (side light) type backlight unit As a backlight unit including a light guide plate, for example, an edge light (side light) type backlight unit is known.
  • An edge-light type backlight unit generally has a configuration in which a light source such as an LED (Light Emitting Diode) is disposed on a side surface of a light guide plate, and light emitted from the light source is transmitted through the light guide plate. The incident light enters the light guide plate from the side surface, and the incident light is guided inside the light guide plate and emitted to the liquid crystal display panel side.
  • the light from the LED can be emitted upward without increasing the thickness of the light guide plate, so that the liquid crystal display device can be easily reduced in thickness.
  • the side surface of the light guide plate is an incident surface on which light is incident.
  • the incident surface is on the upper surface or the lower surface of the light guide plate. It is provided vertically.
  • the incident surface of the light guide plate is formed on an inclined surface inclined with respect to the lower surface of the light guide plate, and the LED as the light source is arranged so that the light emitting surface thereof is parallel to the incident surface of the light guide plate.
  • a backlight unit arranged at an inclination is described.
  • the LEDs are arranged so that the light emitting surface thereof is parallel to the incident surface of the light guide plate. There is an inconvenience that the portion is reflected by the incident surface. Therefore, there is a problem that the incident efficiency is lowered.
  • the incident surface is provided perpendicular to the upper surface or the lower surface of the light guide plate
  • the light incident on the light guide plate is more parallel to the upper surface or the lower surface of the light guide plate.
  • the number of reflections of light within the light guide plate is reduced, there is a disadvantage that sufficient luminance uniformity and color mixing cannot be performed. Therefore, there is a problem that the illumination quality is lowered.
  • the present invention has been made to solve the above-described problems, and one object of the present invention is to provide a lighting device capable of improving incident efficiency and a display device equipped with the lighting device. It is to be.
  • Another object of the present invention is to provide an illumination device capable of improving the illumination quality and a display device equipped with the illumination device.
  • an illumination device includes a light source and a side end portion having an incident surface on which light from the light source is incident, and guides the incident light inside. And a light guide for light emission. And the said entrance plane is formed in the shape match
  • the incident surface of the light guide is formed in a shape that matches the light distribution characteristics of the light source with respect to the height direction of the light guide.
  • the reflection of light on the surface can be suppressed. Thereby, incident efficiency can be improved.
  • the first aspect by configuring as described above, light other than light parallel to the upper surface or the lower surface of the light guide can be easily incident on the light guide. For this reason, since the frequency
  • an edge light type illumination device can be configured by providing a light guide that guides light inside, so that the illumination device can be easily reduced in thickness. You can plan. Moreover, since it is possible to reduce unnecessary reflection by configuring as described above, unnecessary leakage light can also be reduced. Thereby, uniformity (uniformity such as brightness) can be improved.
  • the light guide has a light emission surface that emits incident light toward the outside, and the incident surface of the light guide is a light emission surface. It is configured to include a plurality of types of inclined surfaces that are inclined with respect to the surface. If comprised in this way, since the entrance plane of a light guide can be easily formed in the shape according to the light distribution characteristic of the light source with respect to the height direction of a light guide, Light reflection can be easily suppressed. Thereby, incident efficiency can be improved easily. Moreover, if comprised in this way, illumination quality can be improved easily. In addition, since the area of an incident surface can be increased by the said structure, the incident efficiency to a light guide can be improved more by this.
  • the inclined surface is configured so that the light from the light source is incident at substantially right angles, and the inclined angle is an angle at which the incident light does not exceed the total reflection critical angle in the light guide. Is preferably set. If comprised in this way, while being able to improve the incident efficiency of light effectively, the high quality planar light with which the illumination quality was improved can be radiate
  • the incident surface can be composed of two inclined surfaces having different inclination angles.
  • the incident surface is composed of three or more inclined surfaces having different inclination angles. If comprised in this way, the said entrance plane can be more easily formed in the shape match
  • the incident surface is formed in a concave shape at a side end portion of the light guide. If comprised in this way, since the incident surface of a light guide can be more easily formed in the shape according to the light distribution characteristic of the light source with respect to the height direction of a light guide, The reflection of light can be easily suppressed.
  • the light source may include a plurality of light sources arranged at a predetermined interval.
  • the concave incident surface is preferably formed so as to extend along the arrangement direction of the light sources.
  • the light source is configured by a light emitting diode, and the light from the light emitting diode is disposed so as to be inclined toward the lower surface of the light guide. . If comprised in this way, since the reflection of the light in an entrance plane and leakage light can be reduced effectively, incident efficiency can be improved effectively. Moreover, if comprised in this way, since light other than the light parallel to the upper surface or lower surface of a light guide can be increased easily, the frequency
  • the incident surface of the light guide is subjected to antireflection processing. If comprised in this way, since reflection of the light in an incident surface can be suppressed effectively, incident efficiency can be improved easily.
  • the “antireflection process” includes an antireflection coating.
  • the light guide may be constituted by a light guide plate.
  • the said light guide may be comprised from the rod-shaped light guide bar other than a plate-shaped light guide plate.
  • the light guide plate may be a single light guide plate or a combination of a plurality of strip light guide plates.
  • a display device includes the illumination device according to the first aspect and a display panel that receives light from the illumination device. If comprised in this way, a display apparatus with a high display quality can be obtained easily.
  • an illumination device capable of improving the incidence efficiency and a display device equipped with the illumination device.
  • an illumination device capable of improving the illumination quality and a display device equipped with the illumination device.
  • FIG. 1 is an exploded perspective view of a liquid crystal display device according to a first embodiment of the present invention. It is the side view which showed a part of backlight unit by 1st Embodiment of this invention. It is the top view which showed a part of backlight unit by 1st Embodiment of this invention. It is the top view which showed a part of backlight unit by 1st Embodiment of this invention, and is also an optical path figure which showed the optical path of light. It is the perspective view which showed a part of light guide of the backlight unit by 1st Embodiment of this invention. It is a side view of the A1 direction of FIG.
  • 1 is a cross-sectional view illustrating a part of a backlight unit according to a first embodiment of the present invention. It is sectional drawing which showed a part of backlight unit by the modification of 1st Embodiment. It is sectional drawing which showed a part of backlight unit by 2nd Embodiment of this invention. It is sectional drawing which showed a part of backlight unit by the modification of 2nd Embodiment. It is sectional drawing which showed a part of backlight unit by 3rd Embodiment of this invention, and is also an optical path figure which showed the optical path of light. It is sectional drawing which showed a part of backlight unit by 3rd Embodiment of this invention.
  • FIG. 1 is an exploded perspective view of a liquid crystal display device according to a first embodiment of the present invention.
  • FIG. 2 is a side view showing a part of the backlight unit according to the first embodiment of the present invention.
  • FIG. 3 is a plan view illustrating a part of the backlight unit according to the first embodiment of the present invention.
  • 4 to 7 are views for explaining the backlight unit according to the first embodiment of the present invention.
  • the liquid crystal display device 100 includes a liquid crystal display panel 10, a backlight unit 50 that supplies light to the liquid crystal display panel 10, and a pair facing each other with these interposed therebetween.
  • Housing 70 front housing 71, back housing 72.
  • the liquid crystal display device 100 is an example of the “display device” in the present invention
  • the liquid crystal display panel 10 is an example of the “display panel” in the present invention
  • the backlight unit 50 is an example of the “lighting device” in the present invention.
  • an active matrix substrate 11 including a switching element such as a TFT (Thin Film Transistor) and an opposite substrate 12 facing the active matrix substrate 11 are bonded to each other with a sealing material (not shown). It is constituted by.
  • a liquid crystal (not shown) is injected into the gap between the substrates 11 and 12.
  • a polarizing film 13 is attached to each of the light receiving surface side of the active matrix substrate 11 and the light emitting surface side of the counter substrate 12.
  • the liquid crystal display panel 10 configured in this manner displays an image by using a change in transmittance caused by the tilt of liquid crystal molecules.
  • the backlight unit 50 is an edge light (side light) type backlight unit, and an LED (Light Emitting Diode) module 20 and a light guide 30 that guides light from the LED module 20.
  • the backlight unit 50 is disposed directly below the liquid crystal display panel 10.
  • the LED module 20 constituting the backlight unit 50 is a module that emits light, and includes a mounting substrate 21 and an LED 22 as a light source mounted on the substrate surface of the mounting substrate 21.
  • the mounting substrate 21 is a plate-like and rectangular substrate, and a plurality of electrodes (not shown) are arranged on the mounting surface 21a. And said LED22 is attached on these electrodes.
  • the LED 22 is mounted on an electrode (not shown) formed on the mounting surface 21a of the mounting substrate 21 so as to receive light and emit light.
  • a plurality of LEDs 22 are arranged on the mounting substrate 21 at a predetermined interval.
  • the light guide 30 is made of a transparent resin material such as acrylic or polycarbonate, for example, and is formed on a single light guide plate as shown in FIGS. 1 and 3.
  • the light guide 30 has an upper surface 30U and a lower surface 30B opposite to the upper surface 30U, and a plurality of side end surfaces (side end portions) 31 connected to the upper surface 30U and the lower surface 30B.
  • the light guide 30 is formed in a substantially rectangular shape (substantially rectangular shape) when seen in a plan view.
  • the light guide 30 has four side end faces 31 (31a to 31d). Of the four side end faces 31 (31a to 31d) of the light guide 30, the side end faces 31a and 31b serve as incident surfaces 32 on which the light from the LEDs 22 is incident. That is, the light from the LED 22 enters the light guide 30 through the side end surfaces 31 (31 a and 31 b) of the light guide 30.
  • the side end surfaces 31a and 31b of the light guide 30 are surfaces that face in opposite directions and are parallel to the longitudinal direction (X direction) of the light guide 30. Further, the side end surfaces 31c and 31d of the light guide 30 are surfaces that face in opposite directions to each other and are parallel to the short direction (Y direction) of the light guide 30.
  • the LED modules 20 on which the plurality of LEDs 22 are mounted are divided into two rows on the left and right sides (X direction) of the backlight unit 50 and arranged in two rows.
  • the LED modules 20 are disposed on both the left and right sides of the light guide 30 (on the side end surfaces 31a and 31b side which are incident surfaces). More specifically, as shown in FIGS. 1 to 3, the light emitting surface 22a (see FIGS. 2 and 7) of the LED 22 and the side end surface 31a face each other on the side end surface 31a side of the light guide 30.
  • the LED module 20 is disposed, and the light emitting surface 22a (see FIGS.
  • the LED module 20 is disposed such that the mounting surface 21a of the mounting substrate 21 is perpendicular to the upper surface 30U or the lower surface 30B of the light guide 30.
  • the light incident from the incident surface 32 (side end surface 31) of the light guide 30 guides the light guide 30 and guides the light guide.
  • 30 is emitted as planar light (emitted light) from the upper surface 30U.
  • the upper surface 30U of the light guide 30 serves as a light emitting surface 30U that emits incident light toward the outside (the liquid crystal display panel 10 (see FIG. 1) side).
  • the LED 22 as the light source has a light distribution characteristic having a certain extent as shown by a broken line R in FIG.
  • the incident surface 32 of the light guide 30 is not formed so that it may become parallel with the light emission surface 22a of LED22, but is formed in the shape according to the light distribution characteristic of LED22.
  • a broken line R indicates an example of a light distribution (light distribution characteristic).
  • the incident surface 32 of the light guide 30 is light having an angle that is estimated to have better incident efficiency in the light distribution of the light emitted from the LED 22.
  • the incident surface 32 is composed of two inclined surfaces 33a and 33b.
  • the two inclined surfaces 33a and 33b are inclined at different angles with respect to the upper surface (light emitting surface) 30U of the light guide 30.
  • an angle ⁇ 1 formed by the inclined surface 33a on the upper surface 30U side of the two inclined surfaces and the upper surface (light emitting surface) 30U of the light guide 30 is set to an acute angle.
  • An angle ⁇ 2 formed by the inclined surface 33b on the lower surface 30B side and the upper surface (light emitting surface) 30U of the light guide 30 is set to an obtuse angle. For this reason, the incident surface 32 of the light guide 30 has a concave shape that is recessed toward the inner side of the light guide 30.
  • the concave incident surface 32 extends in the arrangement direction (short direction: Y direction) of the LEDs 22 over the entire length of the side end surfaces 31 (31 a, 31 b) of the light guide 30. ).
  • the inclination angle ⁇ 1 of the inclined surface 33a and the inclination angle ⁇ 2 of the inclined surface 33b are appropriately set according to the light distribution characteristics of the LEDs 22 mounted on the mounting substrate 21, respectively.
  • the inclination angles ⁇ 1 and ⁇ 2 are the angles at which the incident efficiency is most improved in consideration of the light distribution characteristics of the LED 22 and the incident light does not exceed the total reflection critical angle in the light guide 30. Is preferably set.
  • the two inclined surfaces 33a and 33b are arranged in the thickness direction (Z direction) of the light guide 30. It may be formed so as to be symmetric with respect to the center line P (two-dot chain line P). In this case, an angle ⁇ 1 formed between the upper surface 30U of the light guide 30 and the inclined surface 33a is equal to an angle ⁇ formed between the lower surface 30B of the light guide 30 and the inclined surface 33b.
  • the LED module 20 includes the light guide 30 so that the distance a between the mounted LED 22 and the side end face 31 (incident surface 32) of the light guide 30 is 1 mm or less. It is preferable that they are arranged close to each other.
  • the entrance plane 32 of the light guide 30 is formed in the shape matched with the light distribution characteristic of LED22 with respect to the height direction (thickness direction: Z direction) of the light guide 30. Has been.
  • the reflective sheet 41 included in the backlight unit 50 is a sheet covered with the lower surface 30 ⁇ / b> B of the light guide 30, and the reflective surface 41 ⁇ / b> U of the sheet is on the lower surface 30 ⁇ / b> B of the light guide 30. Face. Then, if there is light leaking from the lower surface 30B of the light guide 30, the light is reflected back to the light guide 30 to prevent light loss.
  • the backlight chassis 42 is a box-shaped member, for example, and accommodates them by spreading the LED module 20 and the light guide 30 on the bottom surface 42B.
  • the diffusion plate 43 is an optical sheet that overlaps the light guide 30 and diffuses light emitted from the light guide 30. That is, the diffusion plate 43 diffuses the light from the light guide 30 and spreads the light over the entire area of the liquid crystal display panel 10.
  • the prism sheet 44 is an optical sheet that overlaps the diffusion plate 43.
  • triangular prisms extending in one direction are arranged in a direction intersecting with one direction in the sheet surface, and deflect the radiation characteristics of light from the diffusion plate 43.
  • the lens sheet 45 is an optical sheet that overlaps the prism sheet 44.
  • fine particles that refract and scatter light are dispersed in the lens sheet 45, and the light from the prism sheet 44 is not collected locally, and the difference in brightness (light intensity unevenness) is suppressed.
  • the backlight unit 50 converts the light from the LED module 20 into planar light by the light guide 30, and the planar light is transmitted to the plurality of optical members 43 to 45.
  • the liquid crystal is passed through and supplied to the liquid crystal display panel 10.
  • the non-light-emitting liquid crystal display panel 10 receives the light (backlight light) from the backlight unit 50 and improves the display function.
  • the incident surface 32 of the light guide 30 is made into the shape match
  • reflection of light on the incident surface 32 can be suppressed and incident efficiency can be improved.
  • the edge light type backlight unit 50 can be configured by including the light guide 30 that guides light inside, so that the backlight unit 50 and The liquid crystal display device 100 can be easily reduced in thickness. Moreover, since it can reduce unnecessary reflection in the light guide 30 by comprising as mentioned above, unnecessary leaked light can also be reduced. Thereby, uniformity (uniformity such as brightness) can be improved.
  • the entrance surface 32 of the light guide 30 is comprised from the two inclined surfaces 33 (33a, 33b) inclined with respect to the light-projection surface 30U (upper surface 30U of the light guide 30).
  • the incident surface 32 of the light guide 30 can be easily formed in a shape that matches the light distribution characteristics of the LEDs 22 with respect to the height direction (thickness direction: Z direction) of the light guide 30. Thereby, reflection of light at the incident surface 32 can be easily suppressed. As a result, the incident efficiency can be easily improved.
  • the light incident from the inclined surface 33 becomes light that travels in a direction intersecting the upper surface 30U or the lower surface 30B of the light guide 30, so that the light in the light guide 30 is transmitted.
  • the number of reflections can be increased. For this reason, illumination quality can be improved easily.
  • the area of the incident surface 32 can be increased as compared with the case where the incident surface is provided perpendicular to the upper surface 30U or the lower surface 30B of the light guide 30. Incidence efficiency to the light body 30 can be further improved.
  • the inclined surface 33 is configured so that the light from the LED 22 is incident at a substantially right angle, the light incident efficiency can be effectively improved.
  • the inclined surface 33 is set to an angle at which the incident light does not exceed the total reflection critical angle in the light guide 30, high-quality planar light with improved illumination quality can be emitted. Can do.
  • the incident surface of the light guide is formed so as to be parallel to the light emitting surface of the LED. Less light is incident perpendicular to the. For this reason, since more light is incident at an angle other than perpendicular to the incident surface, a part of the light is reflected by the incident surface, resulting in a decrease in incident efficiency.
  • the incident efficiency is improved, but the light guide 30 expands due to heat, so the LED 22 (LED module 20) It is necessary to dispose a certain distance from the light guide 30. Further, since the distance a from the LED 22 to the side end face 31 (31a, 31b) increases as the screen size of the liquid crystal display device 100 increases, for example, in a large liquid crystal display device of 40 inches or more, the incident efficiency is higher. Tends to decrease.
  • the amount of light incident perpendicularly to the incident surface 32 can be increased by forming the shape of the incident surface 32 as described above. Therefore, in 1st Embodiment which has the said structure, incident efficiency can be improved as mentioned above. Further, such a backlight unit 50 is particularly effective when used in a large-sized liquid crystal display device (for example, 40 inches or more) in which the incident efficiency tends to decrease.
  • the incident surface 32 of the light guide 30 can be more easily guided. Since it can be formed in a shape that matches the light distribution characteristics of the LED 22 with respect to the height direction (thickness direction: Z direction) of the light body 30, it is possible to easily suppress reflection of light on the incident surface 32. it can.
  • the backlight unit 50 is configured to be able to improve the incidence efficiency on the light guide 30, and thus supplies the planar light with high luminance to the liquid crystal display panel 10. It becomes possible. Thereby, the brightness and display quality of the liquid crystal display device 100 can be improved. Further, in the case of configuring the same brightness (luminance) as the conventional one, the number of the LEDs 22 as the light source can be reduced. Therefore, the cost can be reduced by reducing the number of the LEDs 22. Moreover, since the brightness
  • FIG. 8 is a cross-sectional view showing a part of a backlight unit according to a modification of the first embodiment.
  • corresponding components are denoted by the same reference numerals, and repeated description is omitted as appropriate.
  • the incident surface 32 of the light guide 30 is subjected to antireflection processing.
  • a coating layer 35 made of, for example, AR (Anti-Reflective) coating is formed on the incident surface 32 of the light guide 30.
  • the antireflection processing may be antireflection processing other than AR coating.
  • a silica coating that scatters reflected light by providing irregularities on the surface may be used.
  • FIG. 9 is a cross-sectional view illustrating a part of a backlight unit according to a second embodiment of the present invention.
  • a backlight unit according to a second embodiment of the present invention will be described with reference to FIG.
  • corresponding components are denoted by the same reference numerals, and redundant description is omitted as appropriate.
  • the incident surface 32 of the light guide 30 is divided into three parts, and the incident efficiency of the principal ray portion having a large energy ratio is increased.
  • the incident surface 32 of the light guide 30 has two inclined surfaces 33 (33a and 33b) and one plane 33 perpendicular to the upper surface 30U of the light guide 30. (33c).
  • the two inclined surfaces 33a and 33b constituting the incident surface 32 can be, for example, inclined surfaces having the same inclination angle as in the first embodiment.
  • the flat surface 33c constituting the incident surface 32 is arranged between two inclined surfaces 33 (33a, 33b).
  • the three inclined surfaces 33 (33a to 33c) in which the incident surface 32 of the light guide 30 is inclined at different angles with respect to the light emitting surface 30U (the upper surface 30U of the light guide 30). It is composed of
  • the incident surface 32 of the light guide 30 is configured by the three inclined surfaces 33 inclined with respect to the light emitting surface 30U, so that the light guide 30 can be more easily configured.
  • the incident surface 32 can be formed in a shape that matches the light distribution characteristics of the LEDs 22 (see the broken line R in FIG. 9) with respect to the height direction (thickness direction: Z direction) of the light guide 30. Thereby, incident efficiency can be improved more easily.
  • the incident surface 32 can be subjected to antireflection processing.
  • FIG. 10 is a cross-sectional view showing a part of a backlight unit according to a modification of the second embodiment.
  • corresponding components are denoted by the same reference numerals, and redundant description is omitted as appropriate.
  • the incident surface 32 of the light guide 30 is composed of more than three inclined surfaces 33. Therefore, the incident surface 32 of the light guide 30 has a shape closer to the light distribution of the LEDs 22 (see the broken line R in FIG. 10), and the incident efficiency is further improved.
  • the incident surface 32 of the light guide 30 is divided into six (an example in which the incident surface 32 includes six inclined surfaces 33).
  • the number of divisions of the incident surface 32 is four. What is necessary is just to be more than division. In other words, the incident surface 32 of the light guide 30 only needs to be composed of four or more inclined surfaces 33.
  • FIGS. 11 and 12 are cross-sectional views illustrating a part of a backlight unit according to a third embodiment of the present invention.
  • a backlight unit according to a third embodiment of the present invention will be described with reference to FIGS.
  • symbol is attached
  • the LED 22 (LED module 20) is arranged so that the light from the LED 22 is inclined toward the lower surface 30 ⁇ / b> B of the light guide 30. That is, in the third embodiment, unlike the first and second embodiments, the LED module 20 is disposed so as to be inclined so that the mounting surface 21a of the mounting substrate 21 faces the lower surface 30B side of the light guide 30. .
  • the incident surface 32 of the light guide 30 has the LED 22 in the height direction (thickness direction: Z direction) of the light guide 30. It is formed in a shape that matches the light distribution characteristics. Specifically, the incident surface 32 of the light guide 30 is composed of two inclined surfaces 33a and 33b.
  • the shape of the incident surface 32 may be formed in the same manner as in the first embodiment.
  • the area of the surface 33a is preferably configured to be larger than the area of the inclined surface 33b on the lower surface 30B side.
  • the angle ⁇ 1 formed between the inclined surface 33a and the upper surface 30U may be set to be the same as the angle ⁇ formed between the inclined surface 33b and the lower surface 30B, but is set to be different. It is preferable.
  • the LED 22 (LED module 20) is disposed so that the light from the LED 22 is inclined so as to be directed toward the lower surface 30B of the light guide 30, thereby reflecting the light on the incident surface 32.
  • the leakage light can be effectively reduced, the incident efficiency can be effectively improved.
  • the thickness of the light guide 30 is reduced in order to further reduce the thickness of the backlight unit, light leakage that causes light to escape from the incident surface 32 of the light guide 30 to the upper surface 30U side occurs. Can be suppressed.
  • the light distribution characteristic of the LED 22 is a wide directivity characteristic, light leakage to the upper surface 30U side of the light guide 30 can be suppressed. Thereby, generation
  • the incident surface 32 can be subjected to antireflection processing.
  • the incident surface 32 of the light guide 30 comprised the two inclined surface 33
  • the incident surface 32 of the light guide 30 was 3 as shown in the said 2nd Embodiment. It may be composed of two or more inclined surfaces 33.
  • the incident surface of the light guide is configured by a plurality of inclined surfaces.
  • the incident surface of the light body may be composed of a concave curved surface 32a. That is, the incident surface of the light guide body only needs to be formed in a shape that matches the light distribution characteristics of the light source (LED).
  • the shape matching the light distribution characteristics of the light source (LED) is the light of the angle that is estimated to have better incidence efficiency in the light distribution of the emitted light as the principal ray.
  • the principal ray includes a shape that is incident at a substantially right angle.
  • the incident surface of the light guide is formed in a shape that matches the light distribution characteristics of the LED with respect to the height direction of the light guide.
  • the invention is not limited to this, and the incident surface of the light guide may be formed in a shape that matches the light distribution characteristics of the LED with respect to the plane direction (XY plane direction) of the light guide.
  • the incident surface 32 of the light guide 30 has a side end surface 31 of the light guide 30 (in addition to the inclined surface 33 inclined with respect to the upper surface 30U of the light guide 30).
  • 31a, 31b) may be comprised including the inclined surface 36 inclined.
  • Each of the inclined surfaces 33 and 36 may be three or more.
  • the incident surface 32 may be a curved surface.
  • the present invention is not limited to this, and the light guide is, for example, shown in FIG. A configuration in which a plurality of strip-shaped light guide plates 30 as shown in FIG. Further, the light guide may be, for example, a rod-shaped light guide bar in addition to the plate shape.
  • the present invention is not limited to this, and for example, as shown in FIG. It is good also as a structure which has arrange
  • the LED module may be arranged on both the left and right sides or the upper and lower sides. For example, you may arrange
  • the type of LED is not particularly limited.
  • the LED may include a blue light emitting LED chip (light emitting chip) and a phosphor that receives light from the LED chip and fluoresces yellow light.
  • a blue light emitting LED chip light emitting chip
  • a phosphor that receives light from the LED chip and fluoresces yellow light.
  • Such an LED generates white light using light from a blue light emitting LED chip and light emitted from a fluorescent light.
  • the number of LED chips included in the LED is not particularly limited.
  • the phosphor incorporated in the LED is not limited to a phosphor that emits yellow light.
  • an LED includes a blue light emitting LED chip and a phosphor that emits green light and red light in response to light from the LED chip, and emits blue light and fluorescent light (green light) from the LED chip. , Red light) and white light can be used.
  • the LED chip built in the LED is not limited to the one emitting blue light.
  • the LED may include a red LED chip that emits red light, a blue LED chip that emits blue light, and a phosphor that emits green light by receiving light from the blue LED chip. With such an LED, white light can be generated by red light from the red LED chip, blue light from the blue LED chip, and green light that fluoresces.
  • the LED may be an LED that does not contain any phosphor.
  • a red LED chip that emits red light, a green LED chip that emits green light, and a blue LED chip that emits blue light are configured to generate white light by mixing light from all LED chips. Also good.
  • the LED may be a top-view type LED that emits light in a direction perpendicular to the mounting surface of the mounting substrate, or a side that emits light in a direction horizontal to the mounting surface of the mounting substrate.
  • a view-type LED may be used.
  • an example is shown in which an LED is used as the light source of the backlight unit.
  • the present invention is not limited to this, and a light source other than the LED may be used as the light source of the backlight unit.
  • a cold cathode tube may be used as the light source of the backlight unit.
  • the backlight unit includes the diffuser plate, the prism sheet, and the lens sheet as the optical member (optical sheet).
  • the optical member optical sheet
  • the optical member optical sheet
  • the optical member can be appropriately changed (added or deleted) as necessary.
  • the present invention is not limited to this, and is for supplying light to the display panel.
  • the present invention can be applied to all non-light emitting display devices including a backlight unit.
  • Liquid crystal display panel (display panel) 11 ACTIVE MATRIX SUBSTRATE 12 DIRECTIONAL SUBSTRATE 13 POLARIZING FILM 20 LED MODULE 21 MOUNTING BOARD 21a MOUNTING SIDE 22 LED 22a Light emitting surface 30 Light guide 30U Upper surface, light emitting surface 30B Lower surface 31, 31a to 31d Side end surfaces (side end portions) 32 Incident surface 33 Inclined surface 33a, 33b, 33c Inclined surface 35 Coating layer (antireflection processing) 41 reflective sheet 41U reflective surface 42 backlight chassis 42B bottom surface 43 diffuser plate 44 prism sheet 45 lens sheet 50 backlight unit (illumination device) 70 housing 71 front housing 72 rear housing 100 liquid crystal display device (display device)

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

L'invention concerne un dispositif d'éclairage permettant une amélioration d'efficacité d'incidence. Cette unité de rétroéclairage (dispositif d'éclairage) (50) est équipée : d'une DEL (22) servant de source de lumière; et d'un corps de guidage de lumière (30) qui contient une face d'extrémité latérale (31(31a, 31b)) possédant une face d'incidence (32) sur laquelle une lumière provenant de la DEL (22) est incidente, et qui guide la lumière incidente dans une partie interne. Enfin, la face d'incidence (32) du corps de guidage de lumière (30) prend une forme correspondant aux propriétés de distribution de lumière (répartition de distribution R) de la DEL (22) par rapport à la direction de la hauteur (direction Z) du corps de guidage de lumière (30).
PCT/JP2011/061390 2010-08-24 2011-05-18 Dispositif d'éclairage, dispositif d'affichage WO2012026164A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010-187702 2010-08-24
JP2010187702 2010-08-24

Publications (1)

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WO2012026164A1 true WO2012026164A1 (fr) 2012-03-01

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011113852A (ja) * 2009-11-27 2011-06-09 Mitsubishi Electric Corp 面光源装置および表示装置
CN104280812A (zh) * 2013-07-03 2015-01-14 苏州茂立光电科技有限公司 导光组件
JP2015050142A (ja) * 2013-09-04 2015-03-16 久豊技研株式会社 発光装置用部材および発光装置ならびにディスプレイ装置
WO2017073175A1 (fr) * 2015-10-29 2017-05-04 ソニー株式会社 Dispositif électroluminescent, appareil d'affichage et appareil d'éclairage
JP2017220418A (ja) * 2016-06-10 2017-12-14 株式会社ジャパンディスプレイ 照明装置及び表示装置

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Publication number Priority date Publication date Assignee Title
JP2006526796A (ja) * 2003-05-02 2006-11-24 コーニンクレッカ　フィリップス　エレクトロニクス　エヌ　ヴィ 拡散反射ディスプレイのためのフロントライト
JP2008053013A (ja) * 2006-08-23 2008-03-06 Sony Corp バックライト装置及び液晶表示装置
WO2010016501A1 (fr) * 2008-08-05 2010-02-11 シャープ株式会社 Dispositif de source lumineuse de surface
WO2010038522A1 (fr) * 2008-09-30 2010-04-08 シャープ株式会社 Dispositif d’éclairage, dispositif d’affichage et récepteur de télévision

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006526796A (ja) * 2003-05-02 2006-11-24 コーニンクレッカ　フィリップス　エレクトロニクス　エヌ　ヴィ 拡散反射ディスプレイのためのフロントライト
JP2008053013A (ja) * 2006-08-23 2008-03-06 Sony Corp バックライト装置及び液晶表示装置
WO2010016501A1 (fr) * 2008-08-05 2010-02-11 シャープ株式会社 Dispositif de source lumineuse de surface
WO2010038522A1 (fr) * 2008-09-30 2010-04-08 シャープ株式会社 Dispositif d’éclairage, dispositif d’affichage et récepteur de télévision

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011113852A (ja) * 2009-11-27 2011-06-09 Mitsubishi Electric Corp 面光源装置および表示装置
CN104280812A (zh) * 2013-07-03 2015-01-14 苏州茂立光电科技有限公司 导光组件
JP2015050142A (ja) * 2013-09-04 2015-03-16 久豊技研株式会社 発光装置用部材および発光装置ならびにディスプレイ装置
WO2017073175A1 (fr) * 2015-10-29 2017-05-04 ソニー株式会社 Dispositif électroluminescent, appareil d'affichage et appareil d'éclairage
JP2017220418A (ja) * 2016-06-10 2017-12-14 株式会社ジャパンディスプレイ 照明装置及び表示装置

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