WO2012005192A1 - Dispositif d'affichage à cristaux liquides - Google Patents

Dispositif d'affichage à cristaux liquides Download PDF

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Publication number
WO2012005192A1
WO2012005192A1 PCT/JP2011/065204 JP2011065204W WO2012005192A1 WO 2012005192 A1 WO2012005192 A1 WO 2012005192A1 JP 2011065204 W JP2011065204 W JP 2011065204W WO 2012005192 A1 WO2012005192 A1 WO 2012005192A1
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WO
WIPO (PCT)
Prior art keywords
liquid crystal
light
display device
crystal panel
crystal display
Prior art date
Application number
PCT/JP2011/065204
Other languages
English (en)
Japanese (ja)
Inventor
哲 三浦
千幸 神徳
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 WO2012005192A1 publication Critical patent/WO2012005192A1/fr

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/35—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/18—Edge-illuminated signs
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F19/00—Advertising or display means not otherwise provided for
    • G09F19/22—Advertising or display means on roads, walls or similar surfaces, e.g. illuminated
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness

Definitions

  • the present invention relates to a liquid crystal display device.
  • the present invention relates to a liquid crystal display device that takes in external light and uses it as a backlight. Note that this application claims priority based on Japanese Patent Application No. 2010-156906 filed on Jul. 9, 2010, the entire contents of which are incorporated herein by reference. .
  • Digital signage is an information transmission medium that applies digital technology.
  • Digital signage is installed mainly in places where people gather outside the home (for example, stations, airports, shopping centers, public facilities, etc.), and uses advertisements, news, and other information as images such as still images, videos, and telops.
  • a liquid crystal display device is suitably used as a device that specifically realizes digital signage.
  • the 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 arranged on the back side of the liquid crystal panel.
  • a liquid crystal display device In the liquid crystal display device, light emitted from the backlight unit is irradiated from the back side of the liquid crystal panel, so that an image displayed on the liquid crystal panel can be visually recognized.
  • this liquid crystal display device as digital signage, it is possible to freely express images such as still images, moving images, and telops using colorful colors, so the expressibility as an information transmission medium has jumped. Will be improved.
  • the liquid crystal display device is not used as digital signage, in a display device that displays a still image such as a sign, external light such as sunlight is taken from the daylighting unit, and the taken light is used as an optical fiber or the like.
  • a display device that is conveyed to a display panel and used as a backlight has been proposed (for example, see Patent Document 1).
  • the display panel in the display device is changed to a liquid crystal panel, the collected light can be used as it is as a backlight of the liquid crystal panel, and not only low power consumption can be achieved.
  • the service life can be extended. As a result, the running cost can be greatly reduced.
  • the said structure is employ
  • the present invention has been made in view of such a point, and a main object thereof is to provide a daylighting type liquid crystal display device capable of appropriately displaying an image.
  • the liquid crystal display device is a liquid crystal display device capable of displaying an image, and includes a liquid crystal panel, an irradiation unit that irradiates light to the liquid crystal panel, a control device that controls driving of the liquid crystal panel, and the liquid crystal A plurality of daylighting units arranged on the first surface of the plate-like member for collecting and collecting external light.
  • the plurality of daylighting units Are connected to the irradiation unit through optical fibers, and each of the plurality of daylighting units is provided with an optical sensor for detecting the amount of light, and a plurality of LED elements are arranged in the irradiation unit.
  • the control device is connected to an LED drive unit that controls the amount of light emitted from each of the plurality of LED elements, and the control device is connected to the photosensor, Said plurality And the amount of light that the optical sensor corresponding to each of the light portion is detected on the basis, is configured to control the amount of light emitted from each of the plurality of LED elements by the LED driving unit.
  • the plate-like member is rotatable about a rotation axis disposed around the upper side portion of the liquid crystal panel, and on the side opposite to the first surface of the plate-like member.
  • the solar cell panel is arrange
  • control device is connected to a movable control unit that controls the rotation of the plate-shaped member, and the movable control unit rotates the plate-shaped member in accordance with the orbit of the sun. Is configured to control.
  • each of the plurality of daylighting units includes a plurality of condensing lenses, and external light collected by the plurality of condensing lenses is introduced into the optical fiber.
  • the optical sensor is disposed on each surface of the plurality of daylighting units.
  • the optical sensor is connected to the optical fiber.
  • the optical sensor is composed of a photoelectric conversion element.
  • a front light receiving sensor for detecting the amount of external light from the front surface is provided on the front surface of the liquid crystal display device, and the liquid crystal panel uses light from the irradiation unit.
  • a transflective liquid crystal panel capable of switching between a transmissive mode and a reflective mode using outside light from the front, wherein the control device uses the light amount detected by the front light receiving sensor as a reference, and transmits the semi-transmissive
  • the liquid crystal panel is configured to execute switching between the transmission mode and the reflection mode.
  • the front light receiving sensor is arranged in a frame region of the liquid crystal panel.
  • the irradiating unit is an edge light type backlight unit
  • the control device reduces variation in the amount of light detected by the optical sensor corresponding to each of the plurality of daylighting units.
  • the amount of light emitted from each of the plurality of LED elements arranged in the irradiation unit is adjusted.
  • the plate-like member is rotatable about a rotation axis disposed around the upper side portion of the liquid crystal panel, and on the side opposite to the first surface of the plate-like member.
  • a solar cell panel is disposed on the second surface, and the control device is connected to a movable control unit that controls the rotation of the plate-like member.
  • a front light receiving sensor for detecting the amount of external light from the front surface is provided on the front surface of the liquid crystal display device.
  • the liquid crystal panel is a transflective liquid crystal panel capable of switching between a transmission mode using light from the irradiation unit and a reflection mode using external light from the front, and the control device receives the front light reception Based on the light amount detected by the sensor, the semi-transparent
  • the liquid crystal panel is configured to perform switching between the transmission mode and the reflection mode, and when the control device switches to the transmission mode, the first surface of the plate-shaped member is separated from the sun.
  • the movement control unit controls the rotation of the plate-like member so as to receive the external light, and when switching to the reflection mode, the second surface of the plate-like member is external light from the sun.
  • the rotation of the plate-like member is controlled by the movable control unit.
  • the first surface of the plate-like member is located between the vertical direction and the horizontal direction.
  • the liquid crystal display device is a digital signage display device installed outdoors.
  • a method for controlling a liquid crystal display device is a method for controlling a liquid crystal display device that collects and collects external light and irradiates the back surface of the liquid crystal panel with the collected light.
  • the display device includes a liquid crystal panel, an irradiation unit that emits light to the liquid crystal panel, a control device that controls driving of the liquid crystal panel, and a plate-like member attached to a part of the liquid crystal panel, On the first surface of the plate-like member, a plurality of daylighting units that collect and collect external light are arranged, and the plurality of daylighting units are respectively connected to the irradiation unit through optical fibers,
  • Each of the plurality of daylighting units is provided with a light sensor for detecting the amount of light
  • the irradiation unit is provided with a plurality of LED elements
  • the control device is configured to each of the plurality of LED elements.
  • the controller is connected to the drive unit, the control device is connected to the optical sensor, and the control device acquires data of light quantity detected by the optical sensor corresponding to each of the plurality of daylighting units.
  • (A) a step (b) of calculating variation in the light amount data, and a step (c) of adjusting the amount of light emitted from each of the plurality of LED elements so as to reduce the variation. .
  • the plate-like member is rotatable about a rotation axis disposed around the upper side portion of the liquid crystal panel, and on the side opposite to the first surface of the plate-like member.
  • a solar cell panel is disposed on the second surface, and a front light receiving sensor for detecting the amount of external light from the front surface is provided on the front surface of the liquid crystal display device.
  • a transflective liquid crystal panel capable of switching between a transmission mode using light from the irradiation unit and a reflection mode using external light from the front, and the control device detects the front light receiving sensor.
  • the step of switching between the transmissive mode and the reflective mode in the transflective liquid crystal panel is performed with reference to the amount of light that has been transmitted, and the control device, when switched to the transmissive mode,
  • the rotation of the plate member is controlled so that the first surface receives external light from the sun, and when the reflection mode is switched, the second surface of the plate member is moved from the sun.
  • the rotation of the plate-like member is controlled so as to receive external light.
  • a plurality of daylighting units are arranged on the first surface of the plate-like member attached to a part of the liquid crystal panel, and each of the plurality of daylighting units passes through the optical fiber, and the liquid crystal panel. It is connected to the irradiation part which irradiates light.
  • Each of the plurality of daylighting units is provided with an optical sensor that detects the amount of light.
  • the control device is configured to control the amount of light emitted from each of the plurality of LED elements by the LED driving unit on the basis of the amount of light detected by the light sensor corresponding to each of the plurality of daylighting units.
  • the outside light can be taken in and used as the light of the irradiating part. It is possible to suppress the feeling of darkness, and in addition, even if the amount of external light taken in by the surrounding environment is changed by the plurality of LED elements, an image can be appropriately displayed.
  • FIG. 4 is an enlarged view showing a peripheral structure of a condenser lens in the daylighting unit.
  • FIG. 4 is a block diagram for explaining a configuration of a liquid crystal display device 100.
  • FIG. 3 is a flowchart for explaining a control method of liquid crystal display device 100.
  • FIG. 3 is a flowchart for explaining a control method of liquid crystal display device 100.
  • FIG. 3 is a flowchart for explaining a control method of liquid crystal display device 100. It is a perspective view which shows typically the front side structure of the liquid crystal display device 100 in the state which the external light 51 has irradiated.
  • 4 is a perspective view schematically showing a modification example of the front side configuration of the liquid crystal display device 100.
  • FIG. FIG. 11 is a perspective view schematically showing a modification example of the back side configuration of the liquid crystal display device 100.
  • FIG. 11 is a perspective view schematically showing a modification example of the back side configuration of the liquid crystal display device 100.
  • 4 is a perspective view schematically showing a modification example of the front side configuration of the liquid crystal display device 100.
  • FIG. 11 is a perspective view schematically showing a modification example of the back side configuration of the liquid crystal display device 100.
  • the inventor of the present application has examined the case where the liquid crystal display device is used as an outdoor digital signage (electronic advertisement), and obtained the following knowledge.
  • a liquid crystal display device including a reflective liquid crystal panel is used, there is a problem that digital signage cannot be displayed at night and when outside light is weak.
  • color reproducibility and contrast ratio are inferior to those of a transmissive liquid crystal panel, and problems remain in terms of image display with good digital signage.
  • the inventor of the present application can solve the problem that the digital signage installed outdoors feels dark with respect to the external light when taking in the external light such as sunlight and using the light as a backlight.
  • the knowledge that electric power can be achieved was obtained.
  • the outside light taken in is used as a backlight, it cannot be displayed at night and is also affected by changes in the amount of outside light taken in due to the weather and surrounding environment during the day. End up. If such an effect is left as it is, a problem remains in terms of image display with good digital signage, similar to digital signage provided with a reflective liquid crystal panel.
  • the inventor of the present application has intensively studied the above-mentioned problems and conceived a liquid crystal display device (digital signage) that can solve such problems, and has reached the present invention.
  • FIG. 1 is a front perspective view schematically showing a configuration of a liquid crystal display device 100 according to an embodiment of the present invention.
  • 2 and 3 are a rear perspective view and a cross-sectional view schematically showing the configuration of the liquid crystal display device 100 of the present embodiment.
  • the liquid crystal display device 100 of the present embodiment is a liquid crystal display device capable of displaying an image, specifically, a display device for digital signage used outdoors.
  • the liquid crystal display device 100 according to this embodiment includes a liquid crystal panel 10, an irradiation unit 31 that irradiates light to the liquid crystal panel 10, and a control device (not shown) that controls driving of the liquid crystal panel 10.
  • a plurality of plate-like members 20 (20A, 20B) are attached to a part (10a) of the liquid crystal panel 10.
  • the plurality of plate-like members 20 (20A, 20B) are attached to the upper side portion 10a of the liquid crystal panel 10.
  • the upper side portion 10a of the liquid crystal panel 10 is a portion located on the upper side when the liquid crystal panel 10 is arranged in the vertical direction.
  • the plate-like member 20 has a first surface 21 located on the back side when the liquid crystal panel 10 is the front side, and a second surface 22 located on the surface opposite to the first surface 21.
  • the second surface 22 is a surface on the front side when the liquid crystal panel 10 is the front side.
  • the first surface 21 of the plate-like member 20 is provided with a plurality of daylighting sections 40 that collect and collect external light.
  • the plurality of daylighting units 40 are connected to the irradiation unit 31 through optical fibers (or optical transmission paths) 44, respectively.
  • Each of the plurality of daylighting units 40 is provided with an optical sensor 46 that detects the amount of light.
  • a plurality of LED elements 30 are arranged in the irradiation unit 31.
  • the control device of the present embodiment is connected to an LED drive unit that controls the amount of light emitted from each of the plurality of LED elements 30, and the control device is connected to the optical sensor 46.
  • a control apparatus is radiate
  • the plate-like member 20 is rotatable around a rotation shaft 25 arranged around the upper side portion 10 a of the liquid crystal panel 10 (arrows). 27).
  • the solar cell panel 80 can be disposed on the second surface 22 of the plate-like member 20.
  • the plate-like member 20 can be rotated according to the orbit of the sun.
  • a front light receiving sensor 35 that detects the amount of external light from the front surface is provided on the front surface of the liquid crystal display device 100. In the illustrated example, the front light receiving sensor 35 is disposed in the frame region 11 of the liquid crystal panel 10.
  • each of the plurality of daylighting units 40 includes a plurality of condenser lenses 42.
  • the external light 51 collected by the condenser lens 42 is introduced into the optical fiber 44. More specifically, light (external light) 51 from the sun 50 is applied to the daylighting unit 40 disposed on the first surface 21 of the plate-like member 20, and the light 52 applied to the daylighting unit 40 is The light is guided to the optical fiber 44 through the condenser lens 42.
  • An optical connecting portion 43 is provided between the condenser lens 42 and the optical fiber 44.
  • the optical sensor 46 of the present embodiment is disposed on the surface of the daylighting unit 40, and the optical sensor 46 can measure the amount of light 52 that is irradiated on the daylighting unit 40.
  • the optical sensor 46 is composed of a photoelectric conversion element, and can convert light irradiated on the optical sensor 46 into an electrical signal.
  • the photoelectric conversion element constituting the optical sensor 46 is, for example, an element having a structure in which an amorphous silicon layer and a microcrystalline silicon layer are stacked.
  • the irradiation unit 31 of this embodiment is an edge light type backlight unit. As shown in FIG. 3, in the irradiation unit 31 of the present embodiment, a light guide plate 32 is disposed on the back surface of the liquid crystal panel 10, and a reflective film 34 is disposed on the back surface of the light guide plate 32. It is also possible to make the back surface of the light guide plate 32 a diffusion surface without forming the reflective film 34 on the back surface of the light guide plate 32. An end portion (for example, an upper end) of the light guide plate 32 is connected to the optical fiber 44. Further, the end portion (for example, the lower end) of the light guide plate 32 is connected to the LED element 30.
  • the light 54 propagated through the optical fiber 44 enters the light guide plate 32 and becomes light 55.
  • the light 55 becomes irradiation light 58 that irradiates the liquid crystal panel 10 together with the light 56 emitted from the LED element 30 to the light guide plate 32.
  • the liquid crystal panel 10 of this embodiment generally has a rectangular shape as a whole, and is composed of a pair of translucent substrates (glass substrates) 12A and 12B. Both the substrates 12A and 12B are disposed to face each other, and a liquid crystal layer 14 is provided therebetween.
  • the liquid crystal layer 14 is made of a liquid crystal material whose optical characteristics change with application of an electric field between the substrates 12A and 12B.
  • a sealing agent 15 is provided on the outer edge portions of the substrates 12A and 12B to seal the liquid crystal layer.
  • polarizing plates 17A and 17B are attached to the outer surfaces of both the substrates 12A and 12B, respectively.
  • the back side is the array substrate 12A
  • the front side is the color filter substrate (CF substrate) 12B.
  • the irradiation light 58 from the light guide plate 32 in the irradiation unit 31 passes through the polarizing plate 17A, the array substrate 12A, the liquid crystal layer 14, the CF substrate 12B, and the polarizing plate 17B, thereby displaying an image.
  • a light diffusion film (not shown) can be disposed between the light guide plate 32 and the liquid crystal panel 10. When the light diffusing film is arranged, the light passing through the film is more diffused, so that a more uniform surface light source can be obtained.
  • a virtual line (dotted line) is drawn on the light guide plate 32 to show the correspondence between the optical fiber 44 and the LED element 30.
  • FIG. 4 is an enlarged view showing a peripheral structure of the condenser lens 42 in the daylighting unit 40 of the present embodiment.
  • the external light 51 irradiates the surface of the daylighting unit 40
  • the irradiation light 52 is collected by the condenser lens 42.
  • the condensed light 53 is guided to the end face (43) of the optical fiber 44 and propagates through the optical fiber 44.
  • the end face of the optical fiber 44 is an optical connection portion 43 that connects the condenser lens 42 and the optical fiber 44.
  • an optical member such as a mirror or a lens can be used as the optical connecting portion 43 when introducing light into the optical fiber 44.
  • FIG. 1 an optical member such as a mirror or a lens
  • the optical fiber 44 is exposed for the sake of explanation, but the end face of the optical fiber 44 built in the daylighting unit 40 is connected to the light guide plate of the irradiation unit 31. It is possible. Furthermore, a cover portion that covers the daylighting portion 40 is formed on the plate-like member 20 (specifically, on the first surface 21) while exposing the light collecting portion 42 and the optical sensor 46 to the surface. It is also possible to do.
  • FIG. 5 is a block diagram for explaining the configuration of the liquid crystal display device 100 of the present embodiment.
  • the liquid crystal display device 100 includes a liquid crystal panel 10, an irradiation unit 31 of the liquid crystal panel 10, a daylighting unit 40, and a control device 61 that controls driving of the liquid crystal panel.
  • the control device 61 is composed of a semiconductor integrated circuit, and is, for example, an MPU (micro processor unit). Further, the control device 61 can be provided with a storage device (semiconductor memory, hard disk, optical disk, etc.), and various programs can be stored in the storage device, and various data and calculation results can be stored. It is.
  • the control device 61 executes the display of the liquid crystal panel 10 by controlling the liquid crystal panel driving unit 62.
  • the liquid crystal panel driving unit 62 is a part that displays an image on the liquid crystal panel 10 by driving the liquid crystal panel 10.
  • the liquid crystal panel driving unit 62 drives the liquid crystal panel 10 based on a signal input from the control device 61.
  • the liquid crystal panel drive unit 62 corresponds to a driver circuit such as a gate driver or a source driver.
  • the liquid crystal panel driving unit 62 not only displays an image on the entire surface of the liquid crystal panel 10, but also only on a part of the display screen of the liquid crystal panel 10 (for example, the central portion) based on a signal from the control device 41. It is also possible to drive the liquid crystal panel 10 so as to display an image.
  • the control device 61 is connected to an LED driving unit 63 that controls the amount of light emitted from each of the plurality of LED elements 30.
  • a plurality of the LED elements 30 are arranged so as to emit light to the light guide plate included in the irradiation unit 31, and are made of, for example, a white LED.
  • the white LED constituting the LED element 30 is a combination of a blue LED and a phosphor, but other ones (such as a combination of an ultraviolet LED and a phosphor) can also be used.
  • the LED element 30 is shown as a representative example of a dimmable point light source used for changing and displaying the emission intensity for each area of the liquid crystal panel 10.
  • the LED driving unit 63 is a part for individually turning on / off the plurality of LED elements 30 and changing the light emission intensity.
  • the LED driving unit 63 can individually drive the LED elements 30 based on signals input from the control device 61.
  • the LED drive unit 63 is configured by a driver circuit including, for example, a switch.
  • control device 61 is connected to the movable portion 64 that rotates the plate-like member 20.
  • the movable portion 64 is connected to the rotation shaft 25 of the plate-like member 20 and can turn the plate-like member 20 based on a signal input from the control device 61.
  • the movable part 64 is, for example, a motor that can rotate the plate-like member 20.
  • an external system 65 and an external power source 66 are separately connected to the control device 61.
  • the external system 65 is a device for inputting image information to the control device 61.
  • the external system 65 corresponds to, for example, a stand-alone personal computer (PC) or a PC connected to a network server that stores image information.
  • the external power supply 66 is a power supply for supplying power to the liquid crystal display device 100 of the present embodiment, and corresponds to, for example, a commercial power supply.
  • the optical sensor 46 provided in the daylighting unit 40 is connected to the control device 61. And the control apparatus 61 acquires the data of the light quantity which the optical sensor 46 corresponding to each lighting part 40 detected.
  • the control device 61 is connected to the front light receiving sensor 35. Therefore, the control device 61 can also acquire data on the amount of light detected by the front light receiving sensor 35 (that is, the amount of external light from the front).
  • control device 61 the liquid crystal panel driving unit 62, the LED driving unit 63, and the movable unit 64 are shown as separate functional members, but some or all of them are integrated into one semiconductor integrated circuit. It is also possible to construct with a circuit.
  • the light parameter detected by the light sensor 46 or the light parameter processed by the control device 61 (or the LED drive unit 63) may be any parameter that can be handled by the irradiation unit (backlight unit) 31. Therefore, in this sense, it is possible not only to process with the numerical data of the light amount, but also to use other optical parameters such as luminous flux / luminosity and luminance.
  • FIG. 6 is a flowchart for explaining a control method of the liquid crystal display device 100 of the present embodiment.
  • step S110 information on the amount of light from the optical sensor 46 is acquired (step S110).
  • step S110 information on the amount of light of each of the plurality of optical sensors 46 is input to the control device 61.
  • step S120 the output of the LED element (LED light source) 30 is adjusted so that the display brightness of the liquid crystal panel 10 becomes uniform.
  • the control device 61 performs light control of the LED element 30 by controlling the LED drive unit 63 based on the information of the light sensor 46, so that the display brightness of the liquid crystal panel 10 becomes uniform. To do.
  • FIGS. 7 and 8 are perspective views schematically showing the configuration of the liquid crystal display device 100 corresponding to FIGS. 1 and 2, respectively.
  • FIG. 9 is a flowchart for explaining the control method of the present embodiment.
  • the amount of light collected by the daylighting unit 40 in the area where the shadow exists (51B) is different from the amount of light collected by the daylighting unit 40 in the area where the shadow does not exist (51A).
  • the light collected by the daylighting unit 40 is used as a backlight. Therefore, the variation in the amount of light depending on the position of the daylighting unit 40 leads to the variation in the luminance of the liquid crystal panel 10.
  • Possible causes of shadows are the presence of trees, utility poles, buildings, and the like. Moreover, even if there is no shadow at a certain time, there is a possibility that the sun will move and the time when the shadow will occur.
  • step S110 information on the amount of light is acquired from each optical sensor 46 (step S110), and then the variation in the amount of light is calculated (step S122).
  • the control device 61 calculates the variation in the amount of light between the optical sensors 46.
  • the control apparatus 61 adjusts the emitted light intensity of the light radiate
  • the light emission intensity of the LED element 30 that emits to the region corresponding to the shadowed region (51B) is increased, and the LED that emits to the region corresponding to the bright region (51A) as compared with it.
  • the light emission intensity of the element 30 is reduced.
  • the control device 61 calculates the light amount (or light emission intensity) of the light 55 emitted from the corresponding optical fiber 44 based on the light amount information of each optical sensor 46. Then, the control device 61 reduces the variation of the light 55 emitted from the optical fiber 44 calculated by the control device 61 (so that it is as uniform as possible). The amount of light is calculated, thereby determining the light emission intensity of each LED element 30. In the calculation for determining the light emission intensity of each LED element 30, it is based on the parameters of the dimensions of the irradiating unit 31 and the characteristics (degree of diffusion, refractive index, etc.) of the optical member (for example, light guide plate) constituting the irradiating unit 31. Thus, the light emission intensity of the LED element 30 is determined so as to reduce the variation of the light 55 from the optical fiber 44.
  • the processing for reducing such variation is not limited to the case where, for example, a control circuit is formed in the control device 61 itself, and processing is performed by the control circuit.
  • a program stored in a storage device connected to the control device 61 for example, a data processing program for the optical sensor 46, a program for determining the light emission intensity of the LED element 30
  • the control device is based on the program. 61 may be executed.
  • the configuration of the optical member in the optical fiber 44 and the irradiating unit 31 not only the variation due to the determination of the light emission intensity of each LED element 30 but also the process of reducing the light emission intensity of the light 55 emitted from the optical fiber 44 is used together.
  • variation alleviation may be executed. Furthermore, the variation reduction processing here is performed in the case where the light emission luminance is made uniform over the entire surface of the liquid crystal panel 10, and for example, the light emission luminance in the central portion of the liquid crystal panel 10 is slightly increased to Some of the emission luminance is slightly lower than that.
  • the liquid crystal display device 100 of the present embodiment is provided with a front light receiving sensor 35, and the front light receiving sensor 35 is connected to the control device 61. Therefore, it is possible to determine the intensity of the light 58 that the irradiating unit 31 irradiates the liquid crystal panel 10 based on the information on the brightness of the external light detected by the front light receiving sensor 35.
  • an antireflection film is preferably disposed on the surface of the liquid crystal panel 10 in order to suppress reflection.
  • the CF substrate 12B in the liquid crystal panel 10 is made to correspond to the sunlight spectrum. It is preferable to form a color filter.
  • the irradiation unit 31 is preferably provided with an LED element 30 that emits outgoing light having a light spectrum in consideration of the sunlight spectrum. In this way, by forming the color filter and the LED element 30 in a form corresponding to the sunlight spectrum, the difference between the spectrum of the edge light and the spectrum of the sunlight is alleviated, so that a sense of incongruity does not occur. be able to.
  • the control device 61 since the control device 61 is connected to the movable portion 64 that rotates the plate-shaped member 20, the control device 61 can rotate the plate-shaped member 20 in accordance with the orbit of the sun 50. . Accordingly, the plate-like member 20 can be positioned at a position where the external light 51 can be efficiently collected by the daylighting unit 40. For example, as in the example shown in FIG. 3, when the sun 50 is located on the right side, the sun 50 is inclined to the left with respect to the vertical direction (vertical direction) (for example, 15 ° to 45 ° on the left side). ). On the other hand, in the example shown in FIG.
  • the plate-like member 20 when the sun 50 is located on the left side, the plate-like member 20 is extended in the horizontal direction (that is, 90 ° with respect to the vertical direction), and the outside light 51 is transmitted.
  • the daylighting unit 40 can be used for daylighting.
  • Such rotation of the plate-like member 20 in accordance with the orbit of the sun 50 starts a program (orbit tracking program of the sun 50) stored in a storage device connected to the control device 61, Control may be performed by the control device 61 based on this.
  • a transflective liquid crystal panel capable of switching between the transmission mode and the reflection mode can be used as the liquid crystal panel 10. That is, in this case, the liquid crystal panel 10 is a transflective liquid crystal panel capable of switching between a transmission mode using the light 58 from the irradiation unit 31 and a reflection mode using external light from the front.
  • a transflective liquid crystal panel is disclosed in, for example, Japanese Patent Application Laid-Open No. 2007-219172.
  • a switch liquid crystal panel that switches the polarization state of transmitted light in accordance with the drive voltage is arranged between the liquid crystal panel (main liquid crystal panel) 10 and the irradiation unit (backlight) 31, and the switch liquid crystal panel and the irradiation are arranged.
  • a reflective polarizing plate is disposed between the unit 31. Then, the transflective liquid crystal panel is realized by switching the display state between the reflection mode and the transmission mode by switching on / off the irradiation unit 31 and switching the driving voltage of the switch liquid crystal panel. Can do.
  • the liquid crystal panel 10 can be used as a reflection mode when external light from the front is strong.
  • the control device 61 switches between the transmission mode and the reflection mode in the transflective liquid crystal panel 10 based on the amount of light detected by the front light receiving sensor 35 (for example, if it is a predetermined value or more).
  • the reflection mode when the sun 50 is located on the front side, it is suitable for the reflection mode. In this case, even if the plate-like member 20 is rotated to be parallel (or substantially parallel), the amount of light collected by the daylighting unit 40 is small, so that the transmission mode is not suitable.
  • the external light hitting the front of the liquid crystal panel 10 is strong, it will feel dark unless the display brightness of the liquid crystal panel 10 is increased. Therefore, even if the amount of light collected by the lighting unit 40 is small, the light 58 from the irradiation unit 31 It is desirable to increase the amount. Therefore, the power consumption of the LED element 30 tends to increase. Therefore, in the case of the transflective liquid crystal panel 10, when the external light from the front is strong, it is preferable to use the liquid crystal panel 10 as a reflection mode.
  • the transflective liquid crystal panel 10 can be used as a transmission mode.
  • the control device 61 switches between the transmission mode and the reflection mode in the transflective liquid crystal panel 10 based on the amount of light detected by the front light receiving sensor 35 (for example, if it is less than a predetermined value).
  • the transmission mode when the sun 50 is located on the back side, if the plate-like member 20 is appropriately rotated and inclined, the amount of light collected by the daylighting unit 40 can be increased, so that the transmission mode is set. Is suitable. Therefore, in the case of the transflective liquid crystal panel 10, when the external light from the front is weak, it is preferable to use the liquid crystal panel 10 as a transmission mode.
  • the use of a transflective liquid crystal panel capable of switching between the transmissive mode and the reflective mode has been described as the liquid crystal panel 10, but the liquid crystal panel 10 is capable of switching between the transmissive mode and the reflective mode. Even if this is not possible, it is possible to use a transflective liquid crystal panel that can use the transmissive mode and the reflective mode. Specifically, by providing a reflective portion (reflective electrode) at a portion not related to transmissive display in the pixel area of the liquid crystal panel 10 together with a transmissive display portion (transmissive electrode), the transmissive mode and the reflective mode are set. An available transflective liquid crystal panel can be realized. A transflective liquid crystal panel can realize transmittance and image quality close to those of a transmissive type, and can achieve high visibility under external light.
  • the plurality of daylighting units 40 are arranged on the first surface 21 of the plate-like member 20 attached to the upper side portion 10a of the liquid crystal panel 10.
  • the daylighting unit 40 is connected to the irradiation unit 31 through the optical fiber 44.
  • Each daylighting unit 40 is provided with an optical sensor 46.
  • the control device 61 is configured to control the amount of light emitted from each LED element 30 by the LED driving unit 63 with reference to the amount of light detected by the light sensor 46 corresponding to each daylighting unit 40. Therefore, when the liquid crystal display device 100 of the present embodiment is used as an outdoor digital signage, the outside light 51 can be taken in and used as the light (55, 58) of the irradiation unit 31.
  • control device 61 controls the amount of light emitted from each LED element 30 by the LED drive unit 63 on the basis of the amount of light detected by the optical sensor 46, external light taken in by the surrounding environment or the like Even if the amount of light changes (see the areas 51A and 51B shown in FIG. 8), the light 58 applied to the liquid crystal panel 10 can be made uniform, and as a result, an image can be displayed appropriately. it can.
  • the light collected by the lighting unit 40 is used as the irradiation light of the irradiation unit 31 of the liquid crystal panel 10, light (outside light) that is significantly stronger than the light of the room illumination is used. be able to. Therefore, it is possible to solve or alleviate the fact that outdoor digital signage feels dark against outside light, and it is possible to reduce the power consumption of the backlight (irradiation unit 31).
  • light outside light
  • the increase in the power consumption of the backlight can be suppressed by using the external light 51 collected by the lighting unit 40. Further, the light 56 emitted from the LED element 30 in the irradiating unit 31 is adjusted and emitted so as to reduce the variation in the amount of light 55 emitted from the optical fiber 44. Therefore, therefore, The power consumption can be reduced compared with the case where the lighting part 40 does not exist.
  • the liquid crystal panel 10 has a large screen (for example, a panel having a dimension of 60 inches or more), the power consumption increases and therefore the running cost also increases.
  • the daylighting unit Compared with the case where 40 does not exist, power consumption can be significantly reduced.
  • the plate-like member 20 can be controlled as follows. As shown in FIG. 10, when the sun 50 is located on the front side of the liquid crystal panel 10 and the external light 51 from the front is strong, the liquid crystal panel 10 can be used as a reflection mode as described above. it can. When used as the reflection mode, the daylighting unit 40 provided on the first surface 21 of the plate-like member 20 may not be used.
  • the solar cell panel 80 is provided on the second surface 22 of the plate-like member 20 so that the solar cell panel 80 receives the external light 51 (that is, in the illustrated example, the It is preferable that the position of the plate-like member 20 is controlled by the control device 61 so that the two surfaces 22 are inclined.
  • the electricity generated by the solar cell panel 80 can be used as power for driving the liquid crystal display device 100.
  • the plate-like member 20 when the liquid crystal panel 10 is arranged in the vertical direction 90, the plate-like member 20 (in other words, the first surface 21 or the second surface 22 of the plate-like member 20) is as shown in FIG. As shown in FIG. 10, it can be configured to be inclined with respect to the vertical direction 90. Specifically, when the plate-like member 20 can be moved, the plate-like member 20 can be fixed at a position between the vertical direction 90 and the horizontal direction, or when the plate-like member 20 is fixed. The plate member 20 is fixed at a position between the vertical direction 90 and the horizontal direction.
  • the plate-like member due to the external light 51 is disposed when the plate-like member 20 is disposed obliquely as shown in FIG. It is possible to prevent 20 shadows from being generated on the upper portion of the liquid crystal panel 10.
  • the LED elements 30 are arranged at the lower end of the irradiation unit 31.
  • the method of arranging the LED elements 30 is not limited thereto.
  • the LED element 30 may be arranged with the LED element 30 ⁇ / b> A at the lower end of the irradiation unit 31 and with the LED element 30 ⁇ / b> B at the left end and the right end of the irradiation unit 31. It is also possible to arrange the LED elements 30 ⁇ / b> A at the lower end of the irradiation unit 31 and to arrange the LED elements 30 ⁇ / b> B only at one of the left end and the right end of the irradiation unit 31.
  • the LED elements 30 are on the upper end of the irradiation unit 31.
  • the specific specifications and arrangement of the LED elements 30 are determined based on the optical design of the liquid crystal display device 100 to be used, and suitable ones can be adopted as appropriate.
  • the configuration in which only one front light receiving sensor 35 is provided on the front surface of the liquid crystal display device 100 is shown, but not limited thereto, as illustrated in FIG. It can also be provided.
  • the liquid crystal panel includes the intensity of external light received by the other front light receiving sensors 35. The intensity of external light on the front side of the ten can be determined.
  • the front light receiving sensor 35 is not only arranged in the frame area 11 of the liquid crystal panel 10 but can also be built in the substrate of the liquid crystal panel 10 (for example, the array substrate 12A).
  • the optical sensor 46 is disposed on the surface of the daylighting unit 40, but the present invention is not limited thereto.
  • the optical sensor 46 it is also possible to arrange the optical sensor 46 so as to detect the light quantity of each optical fiber 44 in the plate-like member 20.
  • the optical sensor 46 is arranged on the surface of the daylighting unit 40, the light emitted to the light guide plate 32 of the irradiating unit 31 when the optical sensor 46 is arranged so as to detect the light propagating to the optical fiber 44. It becomes easy to predict the light quantity of 55.
  • the LED element 30 is disposed at the end of the irradiation unit 31.
  • the present invention is not limited thereto, and for example, the LED element 30 is disposed on the back surface of the light guide plate 32 as illustrated in FIG. Is also possible.
  • a reflection pattern (or diffusion pattern) 33 is formed on the light guide plate 32, and the reflection pattern 33 and the LED elements 30 are arranged in a matrix as viewed from the back side.
  • the LED elements 30 are arranged between the reflection patterns 33.
  • the control device 61 adjusts the light amount emitted from each LED element 30 so that the variation in the light amount detected by each light sensor 46 is reduced. Can do.
  • the plate-like member 20 is attached to the upper side portion 10a of the liquid crystal panel 10.
  • the present invention is not limited to this, and a configuration example as shown in FIG.
  • the plate-like member 20 has an extension part 20 a, and the extension part 20 a is attached to the upper side part 10 a of the liquid crystal panel 10.
  • a rotation shaft 25 is provided on the upper side portion of the extension portion 20 a, and a plate-like member (main body portion) 20 having a first surface 21 and a second surface 22 on the rotation shaft 25. Is connected.
  • the upper side portion of the liquid crystal panel 10 is not limited to the case where the plate-like member 20 is attached to the upper side portion 10 a of the liquid crystal panel 10, as long as the strength of the plate-like member 20 can be maintained.
  • the plate member 20 may be attached to a portion other than 10a.
  • a support member that supports the plate-like member 20 can be provided on the upper part of the left and right side surfaces when the liquid crystal panel 10 is arranged in the vertical direction, and the plate-like member 20 can be supported by the support member.
  • the plate-like member 20 and the upper side portion 10a may not be in an attached relationship.
  • the image display unit is configured by using one liquid crystal panel 10, but it is also possible to configure one image display unit by combining a plurality of liquid crystal panels 10.
  • a daylighting type liquid crystal display device for example, digital signage
  • a daylighting type liquid crystal display device capable of appropriately displaying an image

Abstract

La présente invention se rapporte à un dispositif d'affichage à cristaux liquides collecteur de lumière qui peut afficher des images de manière appropriée. Le dispositif d'affichage à cristaux liquides (100) comprend un panneau à cristaux liquides (10), une section d'irradiation (31), un dispositif de commande (61), et un élément du type plaque (20) monté sur une partie (10a) du panneau à cristaux liquides (10). Une pluralité de sections collectrices de lumière (40) se trouvent sur une première surface (21) de l'élément du type plaque (20), et chaque section collectrice de lumière (40) est reliée à la section d'irradiation (31) au moyen d'une fibre optique (44). Un capteur de lumière (46) se situe sur chaque section collectrice de lumière (40), et une pluralité d'éléments à LED (30) sont disposés sur la section d'irradiation (31). Le dispositif de commande (61) est relié à une unité d'excitation de LED (63) et aux capteurs de lumière (46). Ledit dispositif de commande (61) est conçu de manière à ce que la quantité de lumière émise par chaque élément à LED (30) grâce à l'unité d'excitation de LED (63) soit régulée sur la base de la quantité de lumière détectée par le capteur de lumière (46) correspondant à chaque section collectrice de lumière (40).
PCT/JP2011/065204 2010-07-09 2011-07-01 Dispositif d'affichage à cristaux liquides WO2012005192A1 (fr)

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JP2010-156906 2010-07-09

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015074303A1 (fr) * 2013-11-25 2015-05-28 深圳市华星光电技术有限公司 Dispositif de collecte de lumière solaire, et afficheur à cristaux liquides utilisant la lumière solaire comme source de rétroéclairage
JP2016512379A (ja) * 2013-03-13 2016-04-25 オーエフエス ファイテル，エルエルシー ハイブリッド太陽光照明システム用の発光ダイオード入力
JP2020510963A (ja) * 2017-02-28 2020-04-09 コエルクス・エッセ・エッレ・エッレＣｏｅＬｕｘ Ｓ．ｒ．ｌ． 大面積光源および大面積照明器具

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Publication number Priority date Publication date Assignee Title
JPS6391629A (ja) * 1986-10-06 1988-04-22 Nec Home Electronics Ltd 液晶表示パネルのバツクライト用集光照明装置
JPH1114984A (ja) * 1997-06-19 1999-01-22 Sanyo Electric Co Ltd 集光機構付液晶表示装置
JPH11242218A (ja) * 1998-02-26 1999-09-07 Hitachi Ltd 反射型液晶表示装置
JP2000009942A (ja) * 1998-06-22 2000-01-14 Sanyo Electric Co Ltd 導光板、その導光板を用いた面光源及び表示装置
JP2000258766A (ja) * 1999-03-04 2000-09-22 Sanyo Electric Co Ltd 採光型液晶表示装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6391629A (ja) * 1986-10-06 1988-04-22 Nec Home Electronics Ltd 液晶表示パネルのバツクライト用集光照明装置
JPH1114984A (ja) * 1997-06-19 1999-01-22 Sanyo Electric Co Ltd 集光機構付液晶表示装置
JPH11242218A (ja) * 1998-02-26 1999-09-07 Hitachi Ltd 反射型液晶表示装置
JP2000009942A (ja) * 1998-06-22 2000-01-14 Sanyo Electric Co Ltd 導光板、その導光板を用いた面光源及び表示装置
JP2000258766A (ja) * 1999-03-04 2000-09-22 Sanyo Electric Co Ltd 採光型液晶表示装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016512379A (ja) * 2013-03-13 2016-04-25 オーエフエス ファイテル，エルエルシー ハイブリッド太陽光照明システム用の発光ダイオード入力
WO2015074303A1 (fr) * 2013-11-25 2015-05-28 深圳市华星光电技术有限公司 Dispositif de collecte de lumière solaire, et afficheur à cristaux liquides utilisant la lumière solaire comme source de rétroéclairage
JP2020510963A (ja) * 2017-02-28 2020-04-09 コエルクス・エッセ・エッレ・エッレＣｏｅＬｕｘ Ｓ．ｒ．ｌ． 大面積光源および大面積照明器具

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