WO2011074376A1 - Dispositif d'affichage à cristaux liquides et unité d'éclairage par l'arrière - Google Patents

Dispositif d'affichage à cristaux liquides et unité d'éclairage par l'arrière Download PDF

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Publication number
WO2011074376A1
WO2011074376A1 PCT/JP2010/070689 JP2010070689W WO2011074376A1 WO 2011074376 A1 WO2011074376 A1 WO 2011074376A1 JP 2010070689 W JP2010070689 W JP 2010070689W WO 2011074376 A1 WO2011074376 A1 WO 2011074376A1
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WIPO (PCT)
Prior art keywords
liquid crystal
light
display device
crystal display
crystal panel
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PCT/JP2010/070689
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English (en)
Japanese (ja)
Inventor
裕志 吉田
千幸 神徳
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シャープ株式会社
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Publication of WO2011074376A1 publication Critical patent/WO2011074376A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
    • 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
    • G02F1/133603—Direct backlight with LEDs

Definitions

  • the present invention relates to a liquid crystal display device configured such that both the emitted light emitted from a built-in light source and the external light taken from a lighting window can be used as a backlight, and the backlight provided in the liquid crystal display device More specifically, the present invention relates to a liquid crystal display device that is suitably used as an information transmission medium for signs, advertisements, signs, and the like by being installed outdoors, and a backlight unit included in the liquid crystal display device.
  • a liquid crystal display device includes a liquid crystal panel in which liquid crystal is sealed between a pair of translucent substrates, and a backlight unit installed on the back side of the liquid crystal panel. By irradiating the emitted light from the back side of the liquid crystal panel, the image displayed on the liquid crystal panel can be viewed.
  • the liquid crystal display device By using the liquid crystal display device to constitute the information transmission medium such as the above-mentioned signboard, advertisement, sign, etc., it becomes possible to freely express still images, moving images, telops, etc. using colorful colors. Therefore, the expressiveness as an information transmission medium can be dramatically improved.
  • a daylighting window for taking in external light over almost the entire back surface of the apparatus main body, and bypasses a light-shielding wiring board disposed inside the apparatus main body.
  • a light guide unit By providing a light guide unit and installing a light source such as an LED at a predetermined position adjacent to the light guide unit, the emitted light emitted from the built-in light source and the outside light taken in from the lighting window are used as a backlight.
  • a liquid crystal display device that can be used in combination is disclosed.
  • Japanese Patent Laid-Open No. 2002-311412 provides a daylighting window for taking in external light over almost the entire back surface of the apparatus main body, and external light is provided on a light-shielding wiring board disposed inside the apparatus main body.
  • a light source such as an LED on the light-shielding wiring board, the light emitted from the built-in light source and the external light taken from the lighting window are backlit.
  • a liquid crystal display device that can be used together is disclosed.
  • the amount of external light taken in from the daylighting window is detected using an optical sensor, and the output of the LED is controlled based on this to complement the external light.
  • Low power consumption is achieved by using emitted light from a built-in light source as a backlight as necessary.
  • the outside light taken in is largely detoured in the inside of the main body of the apparatus, so that the outside light taken in is not lost.
  • the LCD panel cannot be irradiated. Therefore, when it is assumed that the liquid crystal display device having such a configuration is used as an information transmission medium such as the above-described signboard, advertisement, sign, etc., external light cannot be used with high efficiency, resulting in low There arises a problem that it does not greatly contribute to power consumption.
  • the amount of external light reaching the liquid crystal panel greatly changes depending on the incident angle of the external light incident on the lighting window. Therefore, it is impossible to always obtain a sufficient amount of light for visually recognizing the image. Therefore, when it is assumed that the liquid crystal display device having such a configuration is used as an information transmission medium such as the above-described signboard, advertisement, sign, etc., external light cannot be used with high efficiency, resulting in low There arises a problem that it does not greatly contribute to power consumption.
  • the present invention has been made to solve the above-described problems, and the object of the present invention is to provide a back light that is emitted from a built-in light source and external light that is taken from a lighting window.
  • the use efficiency of external light is increased, thereby realizing low power consumption.
  • the liquid crystal display device includes an apparatus main body, a liquid crystal panel, a light source, a daylighting window, an irradiation unit, and a reflecting member.
  • the device body has a front surface and a back surface, and the liquid crystal panel is disposed on the front surface of the device body.
  • the light source emits light and is provided inside the apparatus main body.
  • the said lighting window is a site
  • the said irradiation part is a site
  • the irradiation unit is a part capable of irradiating the liquid crystal panel with both the light emitted from the light source and the light taken into the apparatus main body from the lighting window.
  • the reflection member is rotatably provided at a position between the irradiation unit and the daylighting window, and includes a reflection surface on at least a part of the outer surface.
  • the reflective member guides the light taken from the lighting window to the irradiating unit by reflecting light taken from the lighting window, and the light source. It is preferable to take at least a second position where light emitted from the irradiation unit toward the daylighting window side is guided to the irradiation unit by reflecting the light emitted from the irradiation unit toward the lighting window side.
  • the first position is a position where the reflection surface and the back surface of the liquid crystal panel are non-parallel
  • the second position is that the reflection surface and the back surface of the liquid crystal panel are parallel.
  • liquid crystal display device it is preferable that a plurality of the reflecting members are provided along the back surface of the liquid crystal panel.
  • the liquid crystal display device preferably further includes an optical sensor, a drive unit, and a control unit.
  • the optical sensor detects the amount of light taken in by the daylighting window, and the driving unit is for rotating the reflecting member.
  • the said control part is a site
  • the liquid crystal display device preferably further includes a timer, an optical sensor, a drive unit, and a control unit.
  • the timer measures time
  • the optical sensor detects the amount of light taken in by the daylighting window.
  • the drive unit is for rotating the reflecting member, and the control unit controls the operation of the drive unit based on the time measured by the timer and the amount of light detected by the optical sensor. It is a part to control.
  • control unit controls the light emission intensity of the light source based on the amount of light detected by the optical sensor.
  • the light source is provided in the irradiation section.
  • the light source is disposed in a plane parallel to the back surface of the liquid crystal panel and including the rotating shaft of the reflecting member.
  • the reflecting member is preferably formed of a flat plate member.
  • one of the reflecting members made of the flat plate member is used. It is preferable that the reflecting surface is provided on the main surface.
  • the photoelectric conversion part may be provided in the other main surface of the said reflection member which consists of a flat member.
  • the light source includes a plurality of light emitting diodes.
  • a backlight unit irradiates light toward the back of a liquid crystal panel by being arranged on the back side of the liquid crystal panel, and includes a box-shaped case body having a front opening, and the case body described above.
  • a lighting window provided on the back surface for taking in light from the outside, and a reflecting member provided rotatably in the case body and including a reflecting surface on at least a part of the outer surface.
  • both the outgoing light emitted from the built-in light source and the external light taken from the daylighting window can be used as a backlight, and the liquid crystal display device is provided.
  • the liquid crystal display device which can be used suitably as information transmission media, such as a signboard, an advertisement, a sign, etc. by installing in the outdoors etc., and the backlight unit with which the said liquid crystal display device is equipped.
  • the embodiment described below includes a liquid crystal display device configured to be suitably used for a signboard as an information transmission medium intended to be installed on a wall surface of a building, a rooftop, or the like, and the liquid crystal display device.
  • a backlight unit configured to be suitably used for a signboard as an information transmission medium intended to be installed on a wall surface of a building, a rooftop, or the like.
  • FIG. 1 is a perspective view showing an external structure of a liquid crystal display device according to Embodiment 1 of the present invention.
  • FIG. 2 is an assembly structure of the liquid crystal display device according to this embodiment and the liquid crystal display device. It is a disassembled perspective view which shows the structure of a backlight unit.
  • FIG. 3 is a diagram showing a functional block configuration of the liquid crystal display device according to the present embodiment.
  • the device main body of the liquid crystal display device 1 ⁇ / b> A has a flat, substantially rectangular parallelepiped outer shape, and includes a front case 10 a and a rear case 10 b as a housing 10.
  • the front case 10a is made of a substantially rectangular frame member, and has an opening for exposing a display surface of the liquid crystal panel 20 described later.
  • the rear case 10b is made of a box-like member having a front opening, and is a portion corresponding to a case body of a backlight unit described later.
  • the rear case 10b has a daylighting window on its bottom surface.
  • the front case 10 a and the rear case 10 b are configured to have a substantially rectangular parallelepiped shape by being fitted and fixed, for example, and various components are accommodated in the space inside the housing 10.
  • the liquid crystal display device 1A used as a signboard is installed by fixing the housing 10 to a wall surface of a building or the like, for example.
  • a flat liquid crystal panel 20 having a substantially rectangular shape in plan view is arranged on the front surface of the housing 10, and the liquid crystal panel 20 has a display surface facing forward.
  • the panel 20 is attached to the front case 10a.
  • the liquid crystal panel 20 has a liquid crystal sealed between a pair of translucent substrates made of, for example, a glass substrate, and displays a still image, a moving image, a telop, or the like as an image. .
  • an LED substrate as an irradiation unit is disposed behind the liquid crystal panel 20.
  • the LED board includes a flat board 30 having a substantially rectangular shape in plan view and an LED 31 as a light source mounted on the board 30, and is attached to the front case 10a described above.
  • substrate 30 has translucency,
  • the printed wiring board formed with the translucent resin material represented by the transparent polyethylene terephthalate (PET) etc. can be utilized.
  • a plurality of LEDs 31 are arranged in an array on the front surface of the substrate 30, and are configured by, for example, white LEDs.
  • a backlight unit is disposed behind the LED board.
  • the backlight unit includes the above-described rear case 10b and a reflecting plate 12 as a reflecting member that is rotatably attached to the rear case 10b.
  • the reflecting plate 12 is made of a flat plate-like member extending along the lateral direction of the apparatus main body, and at least one main surface thereof is configured by a reflecting surface.
  • a plurality of reflecting plates 12 are provided in the vertical direction along the back surface of the liquid crystal panel 20, and the plurality of reflecting plates 12 constitute a louver. .
  • the flat reflecting plate 12 as the reflecting member in this way, it becomes possible to form a larger gap by rotating the reflecting plate 12, so that more light is taken in from the lighting window described later. As a result, it is possible to increase the efficiency of use of external light and to reduce the thickness of the backlight unit by dividing the reflector 12 into a louver shape as described above. It becomes possible.
  • the above-described daylighting window is located on almost the entire surface of the bottom surface of the rear case 10b (that is, the back surface of the apparatus main body) to be located behind the plurality of reflecting plates 12.
  • This daylighting window corresponds to a daylighting unit for taking outside light such as sunlight into the inside of the apparatus main body, and is made of translucent resin represented by, for example, polycarbonate resin or acrylic resin, glass, or the like.
  • you may comprise a lighting window by forming an opening part in the bottom face of the back case 10b.
  • the liquid crystal display device 1 ⁇ / b> A in the present embodiment includes a control unit 2, an optical sensor 4, a timer 6, a power supply unit 8, and a drive unit in addition to the liquid crystal panel 20, the LED 31, and the reflector 12 described above.
  • the motor 14 is provided.
  • the control unit 2 and the timer 6 may be configured by mounting various electronic components or the like in a region where the LED 31 of the substrate 30 is not mounted, or a printed wiring different from the substrate 30 described above. You may comprise by mounting various electronic components etc. on a board.
  • the control unit 2 is a part for controlling the overall operation of the liquid crystal display device 1A.
  • the control unit 2 controls the driving of the liquid crystal in the liquid crystal panel 20, controls the operation of the LED 31 to be turned on / off, and the light emission intensity.
  • controlling the operation of the motor 14 such as driving / stopping.
  • the light sensor 4 mainly detects the light amount of light taken from the lighting window, and inputs a signal corresponding to the detected light amount to the control unit 2.
  • the controller 2 can determine, for example, how much the amount of sunlight is based on the signal.
  • the optical sensor 4 mainly detects the amount of light taken from the lighting window as described above, it is preferably provided at a position near the lighting window inside the apparatus body. It is also possible to use it by providing it on the outer surface of the apparatus main body. Further, the amount of light incident from the front side of the liquid crystal panel 20 may be detected by providing a separate optical sensor, not limited to the light taken from the daylighting window.
  • the timer 6 is a part for measuring time, and inputs a signal corresponding to the time measured to the control unit 2. Based on the signal, the control unit 2 can distinguish between daytime and nighttime, for example.
  • the power supply unit 8 is a part for supplying power necessary for driving the liquid crystal display device 1A.
  • an external power source such as a commercial power source, a built-in battery, or the like can be used. When an external power source is used as the power source, an external power source is connected to the power supply unit 8.
  • the motor 14 is for rotating the reflector 12 assembled so as to be rotatable, and rotates the reflector 12 by rotating the reflector 12 by a predetermined angle based on a signal input from the control unit 2.
  • the plurality of reflecting plates 12 constituting the louver may be configured to be driven by a single motor 14, or each of the plurality of reflecting plates 12 is attached with a motor 14 and driven individually. It may be configured to be.
  • FIG. 4 is a diagram showing an internal structure of the liquid crystal display device according to the present embodiment, and is a schematic longitudinal sectional view taken along line IV-IV shown in FIG.
  • the internal structure of the liquid crystal display device and the structure of the backlight unit included in the liquid crystal display device according to the present embodiment will be described in detail with reference to FIG.
  • these components are arranged in the order of the liquid crystal panel 20, the LED substrate, and the backlight unit from the front side of the device body.
  • the liquid crystal panel 20 and the LED substrate are arranged at a predetermined distance in the front-rear direction of the apparatus main body, whereby the back surface of the liquid crystal panel 20 and the front surface of the LED substrate (that is, the main substrate 30 on the side where the LEDs 31 are mounted). Face).
  • the LED substrate and the backlight unit including the reflector 12 and the lighting window are arranged at a predetermined distance in the front-rear direction of the apparatus main body, and thereby the back surface of the LED substrate (that is, the LED 31 is not mounted).
  • the main surface of the substrate 30 on the side and the front surface of the backlight unit face each other.
  • the daylighting window formed on the bottom surface of the rear case 10b and the reflecting plate 12 are opposed to each other by being arranged at a predetermined distance in the front-rear direction of the apparatus main body.
  • the reflector 12 is driven by the motor 14 described above and rotates in the direction of arrow A shown in the drawing.
  • the reflecting plate 12 has a first position (a position indicated by a solid line in the drawing) where the reflecting surface formed on one main surface thereof is not parallel to the back surface of the liquid crystal panel 20, and the reflecting surface is a liquid crystal. It rotates between a second position (a position indicated by a broken line in the drawing) parallel to the back surface of the panel 20.
  • the reflecting plate 12 may be configured to be able to take only the first position and the second position, or may be configured to be able to take a step between these positions. In addition, any position between these positions may be taken.
  • FIG. 5 is a schematic longitudinal cross-sectional view showing an example of a state of use of the liquid crystal display device in the present embodiment in the daytime.
  • the use state shown in FIG. 5 is a case where the sun is located on the back side of the apparatus main body.
  • the reflector 12 In the state of use shown in FIG. 5, the reflector 12 is in the first position. In this state, a gap is formed between the reflecting plates 12 and the reflecting surface of the reflecting plate 12 is inclined, so that sunlight incident on the lighting window is reflected by the reflecting surface and the liquid crystal panel. The light can be guided to the back surface of 20.
  • substrate 30 has translucency, the sunlight taken in from the lighting window is irradiated to the back surface of the liquid crystal panel 20, without substantially losing. Therefore, the sunlight taken in from the lighting window can be used as a backlight with high efficiency.
  • the LED 31 may be turned off when the amount of light detected by the optical sensor 4 is sufficient for visually recognizing the image on the liquid crystal panel 20.
  • the backlight is provided only by the sun light.
  • the LED 31 is turned on and the light emitted from the LED 31 can also be used as a backlight. preferable. Also in this case, since the light emitted from the LED 31 complements sunlight as a backlight, the amount of light is relatively small, and the light emission intensity of the LED 31 can be adjusted appropriately. It is possible to reduce power consumption.
  • FIG. 6 is a schematic longitudinal sectional view showing another example of the state of use of the liquid crystal display device in the present embodiment in the daytime.
  • the use state shown in FIG. 6 is a case where the sun is located on the front side of the apparatus main body.
  • the reflector 12 In the state of use shown in FIG. 6, the reflector 12 is in the second position. In this state, the reflecting plate 12 is in an upright state, and no gap is formed between the reflecting plates 12, so that the reflecting surface faces the back surface of the liquid crystal panel 20. In this state, sunlight incident from the front side of the liquid crystal panel 20 can be guided toward the back surface of the liquid crystal panel 20 by being reflected by the reflection surface of the reflection plate 12.
  • substrate 30 has translucency, the sunlight which injected from the front side of the liquid crystal panel 20 is irradiated to the back surface of the liquid crystal panel 20 without substantially losing. Therefore, sunlight incident from the front side of the liquid crystal panel 20 can be used as a backlight with high efficiency.
  • the LED 31 may be turned off when the amount of sunlight incident from the front side of the liquid crystal panel 20 is sufficient to visually recognize the image of the liquid crystal panel 20.
  • the backlight is covered only with the reflected sunlight incident from the front surface of the liquid crystal panel 20. If the amount of sunlight incident from the front side of the liquid crystal panel 20 is insufficient to view the image on the liquid crystal panel 20, the LED 31 is turned on, and the light emitted from the LED 31 is also backlit. It is preferable to use as. Also in this case, since the light emitted from the LED 31 complements the reflected light of sunlight as the backlight, the amount of light is relatively small, and the emission intensity of the LED 31 is adjusted appropriately. By doing so, it is possible to reduce power consumption.
  • FIG. 7 is a schematic longitudinal sectional view showing an example of the usage state of the liquid crystal display device according to the present embodiment at night.
  • the use state shown in FIG. 7 is employed at night when sunlight cannot be used, and naturally the use of outside light cannot be expected.
  • the reflecting plate 12 In the use state shown in FIG. 7, the reflecting plate 12 is in the second position. In this state, the reflecting plate 12 is in an upright state, and there is almost no gap between the reflecting plates 12, so that the reflecting surface is opposed to almost the entire back surface of the liquid crystal panel 20. Become. In this state, when the LED 31 is turned on, the light emitted from the LED 31 is mainly applied to the back surface of the liquid crystal panel 20. Here, a part of the light emitted from the LED 31 passes through the substrate 30. Then, the light is emitted to the rear of the substrate 30.
  • the outgoing light toward the rear is equivalent to stray light typified by reflected light partially reflected on the back surface of the liquid crystal panel 20, light irradiated directly rearward from the LED 31, or luminance unevenness.
  • stray light typified by reflected light partially reflected on the back surface of the liquid crystal panel 20, light irradiated directly rearward from the LED 31, or luminance unevenness.
  • light that is intentionally emitted backward can be considered.However, when the emitted light is stray light, the amount of light is generally very small but is usually a loss. It will be done.
  • the outgoing light toward the rear is reflected by the reflection surface of the reflection plate 12 and guided back toward the back surface of the liquid crystal panel 20.
  • substrate 30 has translucency, the light reflected in the reflecting plate 12 is irradiated to the back surface of the liquid crystal panel 20 without substantially losing. Therefore, since the light emitted toward the rear can be used again as a backlight, the light emitted from the LED 31 can be used as a backlight with high efficiency, and power consumption can be reduced. Become. Note that the usage state shown in FIG. 7 is not limited to nighttime, and can be used even in the daytime when the weather is not good.
  • control unit 2 Which of the use states described above should be selected is comprehensively determined by the control unit 2 based on the light amount detected by the above-described optical sensor 4 and the time measured by the timer 6. Based on the determination result, the control unit 2 appropriately controls operations such as driving / stopping of the motor 14 as a driving unit and operations such as lighting / extinguishing of the LED 31 and light emission intensity, thereby realizing each use state. .
  • the liquid crystal display device 1A in the present embodiment as described above and the backlight unit included in the liquid crystal display device 1A, the emitted light emitted from the built-in light source and the external light taken from the lighting window (that is, In the liquid crystal display device that can be used as a backlight and the backlight unit provided in the liquid crystal display device, the use efficiency of outside light can be greatly increased, thereby reducing the consumption. Electricity can be realized. Therefore, it can be set as the liquid crystal display device which can be used suitably as information transmission media, such as a signboard, an advertisement, a sign, etc. by installing in the outdoors etc., and the backlight unit with which the said liquid crystal display device is equipped.
  • FIG. 8 is a schematic longitudinal sectional view showing the internal structure of the liquid crystal display device according to Embodiment 2 of the present invention, and FIG. 8 shows an example of the state of use in the daytime.
  • the liquid crystal display device in this Embodiment and the backlight unit comprised in this are demonstrated. Note that portions similar to those of the liquid crystal display device 1A and the backlight unit included in the liquid crystal display device 1A according to Embodiment 1 of the present invention described above are denoted by the same reference numerals in the drawings, and description thereof will not be repeated here.
  • the liquid crystal display device 1 ⁇ / b> B and the backlight unit included therein according to the present embodiment are the above-described liquid crystal display device 1 ⁇ / b> A according to Embodiment 1 of the present invention and the backlight unit included therein. And only the configuration of the reflector 12 is different.
  • the reflection plate 12 made of a flat plate member includes a member 12a having a reflection surface and a photoelectric conversion unit 12b. It is comprised by the laminated body, Thereby, one main surface of the reflecting plate 12 functions as a reflecting surface, and the other main surface of the reflecting plate 12 functions as a light-receiving surface for photoelectric conversion.
  • the photoelectric conversion unit 12b is a solar cell that generates electricity by receiving external light such as sunlight, and the reflection plate 12 is formed, for example, by attaching a solar cell to the member 12a.
  • the photoelectric conversion unit 12b for example, an n-type amorphous SiGe film, an i-type amorphous SiGe film, and a p-type amorphous SiC film sequentially stacked can be used, but is particularly limited as long as it has a pn junction. It is not a thing.
  • the photoelectric conversion unit 12b is electrically connected to the power supply unit 8 via a wiring, a storage battery, or the like (not shown), so that the electric power generated by the photoelectric conversion unit 12b is transmitted to the other through the power supply unit 8. It is used to drive the electrical parts.
  • the photoelectric conversion unit 12b generates power by receiving external light such as sunlight taken from a daylighting window provided on the back surface of the apparatus body. In this case, as shown in FIG.
  • external light such as sunlight taken from a daylighting window provided on the back surface of the apparatus body.
  • the electric power generated by the photoelectric conversion unit 12b is not large enough to cover the entire liquid crystal display device 1B, the electric power is limitedly used for driving the reflection plate 12 described above, for example. Is preferred. If comprised in this way, since it becomes possible to supply electric power required in order to rotationally drive the reflecting plate 12 with an independent power supply, power consumption does not increase.
  • the liquid crystal display device 1B and the backlight unit provided in the present embodiment in addition to the effects described in the first embodiment of the present invention, energy saving is further achieved.
  • the liquid crystal display device and the backlight unit included in the liquid crystal display device can be provided.
  • a liquid crystal display device having a configuration in which LEDs as light sources are arranged in an array on the back side of a liquid crystal panel (that is, an irradiation unit in front of a backlight unit).
  • the present invention is applied to a liquid crystal display device having a configuration in which an LED substrate is provided as an example.
  • the present invention is not necessarily configured as described above.
  • the present invention can also be applied to a liquid crystal display device having a configuration in which a light source is provided in at least one of the periphery of the irradiation unit in the vertical and horizontal directions.
  • a light guide as an irradiating unit is disposed on the back side of the liquid crystal panel and on the front side of the backlight unit described above.
  • the light source is disposed at least one of the upper side, the lower side, and the side.
  • substrate with which LED as a light source was mounted was comprised in the board
  • substrate does not necessarily have translucency. It is not necessary to have it, and you may utilize a light-shielding board
  • FIG. 9 is an exploded perspective view showing the assembly structure of the liquid crystal display device and the structure of the backlight unit provided in the liquid crystal display device according to Embodiment 3 of the present invention.
  • FIG. 10 is a back view shown in FIG. It is a front view of a light unit. Below, with reference to these FIG. 9 and FIG. 10, the liquid crystal display device in this Embodiment and the backlight unit with which it is provided are demonstrated. Note that portions similar to those of the liquid crystal display device 1A and the backlight unit included in the liquid crystal display device 1A according to Embodiment 1 of the present invention described above are denoted by the same reference numerals in the drawings, and description thereof will not be repeated here.
  • the embodiment of the present invention described above in that the LED substrate is assembled to the backlight unit. 1 is different from the liquid crystal display device 1A in FIG. Specifically, in the liquid crystal display device 1C according to the present embodiment, no particular components are arranged between the liquid crystal panel 20 and the backlight unit, and the irradiation unit is configured by a space located between them. ing. Therefore, the LED 31 as a light source is not included in the irradiation unit.
  • the LED 31 as a light source is mounted on a flat substrate 30 extending along the lateral direction of the apparatus main body, so that the plurality of flat reflectors 12 that are rotatably attached to the backlight unit.
  • the LEDs 30 are arranged in a plane parallel to the back surface of the liquid crystal panel 20 and including the rotating shaft 100 (see FIG. 10) of the reflector 12.
  • a backlight unit is disposed on the back side of the liquid crystal panel 20 with a predetermined space therebetween, and the backlight unit is a rear case as a case body. 10b, a reflecting plate 12 as a reflecting member rotatably attached to the rear case 10b, and an LED substrate attached to the rear case 10b.
  • a lighting window is provided on the bottom surface of the rear case 10b, and the LED board and the reflector 12 are both located in front of the lighting window.
  • the reflection plate 12 is made of a flat plate-like member extending along the horizontal direction of the apparatus main body, and a plurality of reflection plates 12 are provided in the vertical direction along the back surface of the liquid crystal panel 20.
  • the LED substrate includes a plate-like substrate 30 extending along the lateral direction of the apparatus main body and a plurality of LEDs 31 mounted on the front surface of the substrate 30, and each between the plurality of reflection plates 12 described above. It is interposed and fixed to the rear case 10b.
  • the reflecting plate 12 takes the second position described above (that is, the position where the reflecting surface is parallel to the back surface of the liquid crystal panel 20), the back surface of the liquid crystal panel 20 is It is preferable that the gap between the reflector 12 and the substrate 30 is made as small as possible so that the substrate 30 is substantially completely covered.
  • a light-transmitting printed wiring board can be used, and a light-shielding printed wiring board can also be used.
  • a translucent printed wiring board is used as the substrate 30, the use efficiency of external light can be increased.
  • a light shielding printed wiring board is used as the substrate 30, the LED 31 faces backward. Can be reflected by the surface of the substrate 30.
  • the liquid crystal display device 1C according to the present embodiment and the configuration such as the backlight unit included in the liquid crystal display device 1C are employed, the same effects as those described in the first embodiment of the present invention described above are obtained.
  • the utilization efficiency of external light can be greatly increased, and low power consumption can be realized. Therefore, it can be set as the liquid crystal display device which can be used suitably as information transmission media, such as a signboard, an advertisement, a sign, etc. by installing in the outdoors etc., and the backlight unit with which the said liquid crystal display device is equipped.
  • FIG. 11 is a front view showing another example of the backlight unit provided in the liquid crystal display device according to the present embodiment.
  • the backlight unit shown in FIG. 9 and FIG. 10 the case where both the reflecting plate 12 and the substrate 30 are constituted by flat members extending along the lateral direction of the apparatus main body is illustrated.
  • the backlight shown in FIG. In the light unit the substrate 30 is constituted by a flat plate-like member extending along the vertical direction of the apparatus main body, and the reflection plate 12 is further divided along the horizontal direction of the apparatus main body.
  • the substrate 30 is arranged between the plates 12. Even in such a configuration, the same effect as described above can be obtained.
  • Embodiments 1 to 3 of the present invention described above the case where a plurality of reflectors 12 are provided has been described as an example, but the number, shape, size, etc. thereof can be changed as appropriate. .
  • the rotation angle of the reflection plate can be appropriately changed according to the use of the installation location, etc., and in some cases, it is always daylighted by configuring the rotation angle of the reflection plate to follow the movement of the sun. It is also possible to make solar light available with high efficiency.
  • the liquid crystal display device that can be used for a signboard installed outdoors is described as an example.
  • advertisements, signs, etc. installed outdoors The liquid crystal display device as described above can be used for the information transmission medium, and even when installed indoors, the liquid crystal display device can be used if it is a place where the outside light such as sunlight can reach.
  • 1A to 1D liquid crystal display device 2 control unit, 4 optical sensor, 6 timer, 8 power supply unit, 10 housing, 10a front case, 10b rear case, 12 reflector, 12a member, 12b photoelectric conversion unit, 14 motor, 20 liquid crystal panel, 30 substrate, 31 LED, 100 rotating shaft.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Liquid Crystal (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Planar Illumination Modules (AREA)
  • Mathematical Physics (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)

Abstract

L'invention porte sur un dispositif d'affichage à cristaux liquides (1A) qui est équipé d'un panneau à cristaux liquides (20), qui est disposé sur la surface avant du corps de dispositif principal, d'une fenêtre d'admission de lumière, qui est disposée sur la surface arrière du corps de dispositif principal, de plaques réfléchissantes (12, qui sont disposées entre le panneau à cristaux liquides (20) et la fenêtre d'admission de lumière, et d'une unité d'éclairage, qui est disposée entre le panneau à cristaux liquides (20) et les plaques réfléchissantes (12). L'unité d'éclairage est pourvue d'une pluralité de diodes électroluminescentes (31), qui sont disposées en réseau, et la lumière émise par ladite pluralité de diodes électroluminescentes (31) se réverbère sur le panneau à cristaux liquides (20) à partir du côté de surface arrière. Les plaques réfléchissantes (12) présentent chacune une surface réfléchissante sur une surface principale de celles-ci, et sont fixées de façon rotative sur le corps de dispositif principal. Une lumière admise par la fenêtre d'admission de lumière est guidée vers l'unité d'éclairage par réflexion sur les surfaces réfléchissantes des plaques réfléchissantes (12), et se réverbère ensuite sur le panneau à cristaux liquides (20) à partir du côté de surface arrière. Grâce à cette configuration, la consommation d'énergie du dispositif d'affichage à cristaux liquides peut être réduite en augmentant l'efficacité d'utilisation de la lumière extérieure.
PCT/JP2010/070689 2009-12-17 2010-11-19 Dispositif d'affichage à cristaux liquides et unité d'éclairage par l'arrière WO2011074376A1 (fr)

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JP2009-286721 2009-12-17
JP2009286721A JP2013040979A (ja) 2009-12-17 2009-12-17 液晶表示装置およびバックライトユニット

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
JP2013152804A (ja) * 2012-01-24 2013-08-08 Kmtec:Kk 照明器具
CN111511438A (zh) * 2018-11-30 2020-08-07 首尔伟傲世有限公司 人体内功能性物质合成用光照射装置

Families Citing this family (4)

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Publication number Priority date Publication date Assignee Title
JP6249891B2 (ja) * 2014-06-26 2017-12-20 三菱電機株式会社 表示装置
KR102526749B1 (ko) * 2015-09-24 2023-04-27 삼성전자주식회사 홀로그래픽 디스플레이용 백 라이트 유닛
CN108621133B (zh) * 2016-10-12 2020-12-18 常州信息职业技术学院 激光对射式工业机械手工作点坐标示教工具的示教方法
KR101813109B1 (ko) * 2016-12-08 2017-12-29 (주)주연테크 모니터 대기전력 공급장치

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Publication number Priority date Publication date Assignee Title
JPS60147719A (ja) * 1984-01-12 1985-08-03 Seikosha Co Ltd 太陽電池付き表示素子
JPS6195176U (fr) * 1984-11-29 1986-06-19
JPS61172180A (ja) * 1984-12-27 1986-08-02 セイコーエプソン株式会社 液晶表示装置
JPS62111233A (ja) * 1985-06-04 1987-05-22 Seiko Epson Corp ビユ−フアインダ−
JPS6287314U (fr) * 1985-11-20 1987-06-04
JP2009537873A (ja) * 2006-05-25 2009-10-29 マジンク ディスプレイ テクノロジーズ リミテッド コレステリック液晶表示装置の照明

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Publication number Priority date Publication date Assignee Title
JPS60147719A (ja) * 1984-01-12 1985-08-03 Seikosha Co Ltd 太陽電池付き表示素子
JPS6195176U (fr) * 1984-11-29 1986-06-19
JPS61172180A (ja) * 1984-12-27 1986-08-02 セイコーエプソン株式会社 液晶表示装置
JPS62111233A (ja) * 1985-06-04 1987-05-22 Seiko Epson Corp ビユ−フアインダ−
JPS6287314U (fr) * 1985-11-20 1987-06-04
JP2009537873A (ja) * 2006-05-25 2009-10-29 マジンク ディスプレイ テクノロジーズ リミテッド コレステリック液晶表示装置の照明

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013152804A (ja) * 2012-01-24 2013-08-08 Kmtec:Kk 照明器具
CN111511438A (zh) * 2018-11-30 2020-08-07 首尔伟傲世有限公司 人体内功能性物质合成用光照射装置
CN111511438B (zh) * 2018-11-30 2024-01-09 首尔伟傲世有限公司 人体内功能性物质合成用光照射装置

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