WO2012005191A1

WO2012005191A1 - Liquid crystal display device

Info

Publication number: WO2012005191A1
Application number: PCT/JP2011/065203
Authority: WO
Inventors: 哲三浦; 千幸神徳
Original assignee: シャープ株式会社
Priority date: 2010-07-09
Filing date: 2011-07-01
Publication date: 2012-01-12

Abstract

Provided is a light-collecting liquid crystal display device that can appropriately display images. The liquid crystal display device is provided with a liquid crystal panel (10), an irradiation section (31), a control device (61), and a plurality of plate-like members (20 (20A, 20B)) mounted to part (10a) of the liquid crystal panel (10). Light-collecting sections (40) that collect outside light (51) and propagate the light are positioned on a first surface (21) of the plate-like members (20 (20A, 20B)). The light-collecting sections (40) are connected to the irradiation section (31), the plurality of plate-like members (20) comprises two plate-like members (20A, 20B), and the two plate-like members (20A, 20B) and the liquid crystal panel (10) form a Y shape.

Description

Liquid crystal display

The present invention relates to a liquid crystal display device. In particular, the present invention relates to a liquid crystal display device that takes in external light and uses it as a backlight.
This application claims priority based on Japanese Patent Application No. 2010-156908 filed on Jul. 9, 2010, the entire contents of which are incorporated herein by reference. .

In recent years, digital signage has attracted attention. 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. To display. Here, 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. 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. By using 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.

However, when a liquid crystal display device is used as digital signage, there is a problem that not only the initial cost during installation is high, but also the running cost is high. The main factor that increases the running cost is that the power consumption of the light source incorporated in the backlight unit described above is large. In recent years, the display screen of a liquid crystal display device has been greatly increased in size, and in a liquid crystal display device having such a large display screen, the consumption of the light source built into the backlight unit is also reduced. It tends to increase according to the situation. In recent years, light-emitting diodes (LEDs) with relatively low power consumption have begun to be used as light sources for backlight units, but still lower power consumption is indispensable in consideration of long-term use.

Therefore, there has been proposed a liquid crystal display device that reduces power consumption by generating power using a solar panel and driving the light source using the generated power. However, when the liquid crystal display device is used as digital signage, there is a problem in that the installation cost increases because the solar cell panel is relatively expensive. Moreover, since the lifetime of the solar cell panel is not necessarily long, it becomes necessary to periodically replace the solar cell panel, resulting in another problem that the running cost is high.

On the other hand, although 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). Here, when 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. Moreover, if the said structure is employ | adopted, compared with the case where the liquid crystal display device using the solar cell panel mentioned above is used, installation cost can also be reduced significantly.

JP-A-8-292726

However, when the above-described daylighting type liquid crystal display device is used as digital signage, there is a problem that it can be used only during the daytime because it can hardly collect outside light at night. Furthermore, when there is a shortage in the amount of external light taken in due to the weather or the surrounding environment even during the daytime, there arises a problem that an image cannot be appropriately displayed with sufficient luminance. In particular, the latter problem becomes conspicuous when a liquid crystal display device having the large display screen is used as a digital signage as the display screen of the liquid crystal display device is increased in size in recent years.

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 according to the present invention 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 plate-like members attached to a part of the panel, and on each first surface of the plurality of plate-like members, a daylighting unit that collects external light and propagates light is disposed, The daylighting unit is connected to the irradiation unit, the plurality of plate-like members are two plate-like members, and the two plate-like members and the liquid crystal panel form a Y-shape. is doing.

In a preferred embodiment, the first surface of the plate-like member is a surface positioned on the upper side when the liquid crystal panel is positioned on the lower side.

In a preferred embodiment, the first surface of the plate-like member is provided with a plurality of optical sensors for detecting the amount of light, and the irradiation unit is provided with a plurality of LED elements, and the control The device is connected to an LED drive unit that controls the amount of light emitted from each of the plurality of LED elements, the control device is connected to the light sensor, and the control device is connected to the light sensor. The light amount emitted from each of the plurality of LED elements is controlled by the LED driving unit on the basis of the detected light amount.

In a preferred embodiment, the optical sensor is composed of a photoelectric conversion element.

In a preferred embodiment, 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 | positioned at the 2nd surface located.

In a preferred embodiment, the 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.

In a preferred embodiment, the irradiation section includes a light guide plate, and the daylighting section is connected to the light guide plate of the irradiation section.

In a preferred embodiment, the irradiating unit includes a light guide plate, and the daylighting unit includes a condensing unit that collects and collects external light, and an optical fiber connected to the condensing unit. The optical fiber is connected to the light guide plate of the irradiation unit.

In a preferred embodiment, 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.

In a preferred embodiment, the front light receiving sensor is arranged in a frame region of the liquid crystal panel.

In a preferred embodiment, the irradiating unit is an edge light type backlight unit, and the control device is arranged in the irradiating unit so as to reduce variation in the amount of light detected by the photosensor. The amount of light emitted from each of the plurality of LED elements is adjusted.

In a preferred embodiment, 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. 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. 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. When 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 so as to be received.

In a preferred embodiment, the liquid crystal display device is a digital signage display device installed outdoors.

According to the liquid crystal display device of the present invention, the daylighting unit is disposed on each first surface of the plurality of plate-like members attached to a part of the liquid crystal panel, and the daylighting unit emits light to the liquid crystal panel. It is connected to the irradiation part to irradiate. Further, the plurality of plate-like members are two plate-like members, and the two plate-like members and the liquid crystal panel form a Y shape.
Therefore, in the case where the liquid crystal display device is used as an outdoor digital signage, it is possible to take in external light using a plurality of plate-like members and use the light for the light of the irradiating unit. It is possible to prevent the digital signage from feeling dark against outside light. In addition, since the two plate-like members and the liquid crystal panel form a Y shape, the influence of the shadow on the liquid crystal panel caused by the plate-like member when external light is irradiated from the front side can be reduced. it can. As a result, a daylighting type liquid crystal display device capable of appropriately displaying images can be realized.

It is a perspective view which shows typically the front side structure of the liquid crystal display device 100 which concerns on embodiment of this invention. It is sectional drawing which shows typically the side surface structure of the liquid crystal display device 100 which concerns on embodiment of this invention. It is a perspective view which shows typically the back surface side structure of the liquid crystal display device 100 which concerns on embodiment of this invention. 3 is an enlarged view showing a cross-sectional structure of a daylighting unit 40. 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. 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 1000 of a comparative example. It is sectional drawing which shows typically the side surface structure of the liquid crystal display device 1000 of a comparative example. 2 is a cross-sectional view schematically showing a side configuration of the liquid crystal display device 100. FIG. 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. 4 is a cross-sectional view schematically showing a modification example of a side configuration of the liquid crystal display device 100. FIG. 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 cross-sectional view schematically showing a modification example of a side configuration of the liquid crystal display device 100. FIG. It is an enlarged view which shows the example of a change of the cross-section of the lighting part.

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. First, when 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. In the case of a reflective liquid crystal panel, 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.

Furthermore, even when a transmissive liquid crystal panel is used, digital signage installed outdoors may feel dark against external light. This is because outdoor light (sunny daylight sunlight: about 100,000 lux) has an illuminance that is about 250 times stronger than indoor lighting (fluorescent lamp lighting office: about 400 lux). Yes. On the other hand, it is practically impossible to attach a backlight that emits light that can handle outdoor light to the liquid crystal panel. Therefore, it is difficult to solve the problem that outdoor digital signage feels dark against outside light.

In addition, 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. However, when 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.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, components having substantially the same function are denoted by the same reference numerals for the sake of brevity. In addition, this invention is not limited to the following embodiment.

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 cross-sectional view and a rear perspective view schematically showing the configuration of the liquid crystal display device 100 of the present embodiment.

As shown in FIG. 1, 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.

Further, a plurality of plate-like members 20 (20A, 20B) are attached to a part (10a) of the liquid crystal panel 10. In the present embodiment, 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. Each plate-like member 20 (20 A, 20 B) includes 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. have. In other words, the second surface 22 is a surface on the front side when the liquid crystal panel 10 is the front side.

As shown in FIG. 2 or FIG. 3, the first surface 21 of each plate-like member 20 (20A, 20B) is provided with a daylighting unit 40 that picks up external light and propagates the light. The daylighting unit 40 is connected to the irradiation unit 31 that irradiates the liquid crystal panel 10 with light. In the configuration of the present embodiment, the plurality of plate-like members 20 are two plate-

like members

20A and 20B, and the two plate-

like members

20A and 20B and the liquid crystal panel 10 form a Y-shape. Yes.

In the configuration of the present embodiment, the first surface 21 of the plate-like member 20 (20A, 20B) is a surface positioned on the upper side when the liquid crystal panel 10 is positioned on the lower side. In other words, in the present embodiment, the first surface 21 of the plate-shaped member 20 is a surface facing the sky side, and the second surface 22 is a surface facing the ground side. Furthermore, the first surface 21 of the plate-like member 20 is provided with a plurality of optical sensors 46 that detect the amount of light. In addition, a plurality of LED elements 30 are arranged in the irradiation unit 31. Here, 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. And according to the structure of this embodiment, a control apparatus is comprised so that the light quantity radiate | emitted from each of several LED element 30 may be controlled by the LED drive part on the basis of the light quantity which each photosensor 46 detected. Has been.

Further, in the configuration of the present embodiment, as shown in FIG. 1, 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). Here, the two plate-like members 20 A and 20 B can be integrated and rotated around the rotation shaft 25. Alternatively, the two plate-like members 20 A and 20 B may be configured to rotate independently about the rotation shaft 25.

In addition, it is also possible to arrange the solar cell panel 80 on the second surface 22 of the plate-like member 20. Further, the plate-like member 20 can be rotated according to the orbit of the sun. When rotating according to the orbit of the sun, it is preferable to construct the control device so that such a program can be realized by the control device, that is, such rotation can be executed. In addition, 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.

As shown in FIG. 2, a daylighting unit 40 A (40) that collects external light 51 and propagates light 54 is disposed on the first surface 21 of the plate-like member 20 A. Similarly, a daylighting unit 40B (40) that takes outside light 51 and propagates light 54 is also arranged on the first surface 21 of the plate-like member 20B. The daylighting unit 40 is composed of a light guide plate that propagates incident light, and the daylighting unit (light guide plate) 40 is composed of a transparent resin. In the illustrated example, a cover portion 47 for protecting the daylighting portion 40 is provided. The cover portion 47 is made of a translucent member, and is made of, for example, transparent resin or glass. 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 As indicated by an arrow 54, the light is guided to the irradiation unit 31. Here, the light 54 propagated through the daylighting unit 40 is guided to the light guide plate 32 of the irradiation unit 31. In the illustrated configuration example, the daylighting portion (light guide plate) 40A of the plate-like member 20A and the daylighting portion (light guide plate) 40B of the plate-like member 20B include an optical connection member (for example, an optical connection component made of resin) 41. Through the light guide plate 32 of the irradiation unit 31.

As shown in FIG. 3, the optical sensor 46 of the present embodiment is provided on the upper end side of the plate-like member 20 (20A, 20B). Specifically, the optical sensor 46 and the upper end of the daylighting unit 40 (40A, 40B) It arrange | positions between the upper ends of the plate-shaped member 20. FIG. In this example, the optical sensors 46 are arranged at equal intervals in a line from the left side to the right side. With this optical sensor 46, the light quantity of the light 52 irradiated to the daylighting section 40 (40A, 40B) can be measured. Specifically, the light sensor 46 can measure the light quantity of the light 52 applied to the daylighting units 40 in the respective portions ranging from the right side to the left side in the

daylighting units

40A and 40B. 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. Note that the arrangement example of the optical sensor 46 is not limited to the example illustrated in FIG. 3, for example, and a suitable one can be adopted according to the usage form.

The irradiation unit 31 of this embodiment is an edge light type backlight unit. As shown in FIG. 2, 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 a daylighting unit 40 disposed on the plate-like member 20. 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 that has propagated through the daylighting unit 40 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. Further,

polarizing plates

17A and 17B are attached to the outer surfaces of both the

substrates

12A and 12B, respectively. In the present embodiment, of both the

substrates

12A and 12B, the back side is the array substrate 12A, while 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. In FIG. 3, a virtual line (dotted line) is drawn on the light guide plate 32 to show the correspondence between each part of the light guide plate 32 and the LED element 30 in an easy-to-understand manner. However, as the arrangement relationship / correspondence relationship of such LED elements 30, a suitable one according to the actual optical design of the irradiation unit 31 is appropriately adopted. The arrangement example of the LED elements 30 is not limited to the illustrated number and arrangement position, and can be appropriately changed to a suitable one. In addition, in FIG.1 and FIG.3, although the LED element 30 is clarified for description, in this example, as shown in FIG. 2, the LED element 30 is provided on the end surface of the light guide plate 32 in the frame region 11. Has been placed. Further, the light 54, the light 55, the light 56, and the like are indicated by arrows in a predetermined direction for easy understanding, but other light components exist.

FIG. 4 is an enlarged view showing a cross section of the daylighting unit 40 of the present embodiment. The bottom surface 40b of the daylighting unit 40 (40A, 40B) of the present embodiment has a saw-like cross section so that light propagating through the daylighting unit 40 travels in the direction of the arrow 54 as a whole. From the plurality of inclined surfaces 41a such that the light 52 reflected by the bottom surface 40b of the daylighting unit 40 travels in the direction of the arrow 54, and the vertical surface (or substantially vertical surface) 41b for forming the inclined surface 41a, the daylighting unit The bottom surface 40b of 40 is configured. Further, part of the light (53) traveling in the daylighting unit 40 reflects the upper surface 40a of the daylighting unit 40 and travels in the direction of the arrow 54. Then, the light (54) propagating through the daylighting unit 40 reaches the light guide plate 32 of the irradiation unit 31.

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 of the present embodiment 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 10. 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.

Here, 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. To do. Specifically, 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 61. 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 drive unit (for example, LED driver circuit) 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. Note that 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. Specifically, the LED drive unit 63 is configured by a driver circuit including, for example, a switch.

Furthermore, in the configuration of the present embodiment, the 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.

In addition, 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.

In the configuration of the present embodiment, the optical sensors 46 provided on the plate-

like members

20A and 20B are connected to the control device 61. And the control apparatus 61 acquires the data of the light quantity which each optical sensor 46 provided in

lighting part

40A, 40B 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).

In the illustrated configuration example, the 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.

Next, the operation of the liquid crystal display device 100 of this embodiment will be described. FIG. 6 is a flowchart for explaining a control method of the liquid crystal display device 100 of the present embodiment.

When operating the liquid crystal display device 100 of the present embodiment, first, information on the amount of light from the optical sensor 46 is acquired (step S110). Here, information on the amount of light of each of the plurality of optical sensors 46 is input to the control device 61. Next, 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 (step S120). Here, 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.

Further, the operation of the liquid crystal display device 100 will be further described with reference to FIG. FIG. 7 is a flowchart for explaining the control method of the present embodiment.

First, when the liquid crystal display device 100 of the present embodiment is used as digital signage outdoors as shown in FIG. 2, light (external light) 51 from the sun 50 is applied to the first surface 21 of the plate-like member 20. Assuming that Since the liquid crystal display device 100 is installed outdoors, the external light 51 is not necessarily irradiated uniformly over the entire first surface 21 of the plate-

like members

20A and 20B. For example, there may be a region where a shadow is present on a part of the first surface 21 of the plate-like member 20 and a bright region other than that. Here, the amount of light collected by the

daylighting units

40A and 40B in the region where the shadow is present is different from the amount of light collected by the

daylighting units

40A and 40B in the region where the shadow is not present. In the liquid crystal display device 100 according to the present embodiment, the light collected and propagated by the

daylighting units

40A and 40B is used as a backlight. Therefore, the variation in the amount of light by each part of the

daylighting units

40A and 40B is different from the liquid crystal panel 10. Will lead to variations in brightness. 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.

In the operation of the liquid crystal display device 100 of the present embodiment, as shown in FIG. 7, 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). Here, the control device 61 calculates the variation in the amount of light between the optical sensors 46. And the control apparatus 61 adjusts the emitted light intensity of the light radiate | emitted from each LED element 30 by controlling the LED drive part 63 so that the variation in the light quantity may be reduced (step S124). For example, the light emission intensity of the LED element 30 emitted to the part corresponding to the area where the shadow is present is increased, and the light emission intensity of the LED element 30 emitted to the part corresponding to the bright area is reduced.

Specifically, the control device 61 calculates the light amount (or light emission intensity) of the light 55 emitted from the daylighting unit 40 of the corresponding part based on the information on the light amount of each optical sensor 46. Then, the light emitted from each LED element 30 by the control device 61 so as to reduce the variation of the light 55 emitted from the end face of the lighting unit 40 calculated by the control device 61 (so as to be as uniform as possible). The light quantity of 56 is calculated, and thereby the light emission intensity of each LED element 30 is determined. 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 emission intensity of the LED element 30 is determined so as to reduce the variation in the light 55 from the daylighting unit 40.

Note that 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. For example, 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) is started, and the control device is based on the program. 61 may be executed. In addition, depending on the configuration of the optical member in the daylighting unit 40 and the irradiation unit 31, not only the variation is reduced by 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 end face of the daylighting unit 40. May be used to reduce variation. 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.

Further, 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. In addition, an antireflection film is preferably disposed on the surface of the liquid crystal panel 10 in order to suppress reflection.

In addition, in the configuration of the present embodiment, since the external light 51 is taken from the daylighting unit 40 and used as the irradiation light 58 of the irradiation unit 31, 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. In addition, 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.

Next, although different from the configuration of the liquid crystal display device 100 of the present embodiment, problems of the liquid crystal display device (comparative example) 1000 including the plate member 120 will be described. FIG. 8 is a perspective view showing a configuration of a liquid crystal display device 1000 of a comparative example, and FIG. 9 shows a side configuration of the liquid crystal display device 1000 of the comparative example. On the other hand, FIG. 10 shows a side configuration of the liquid crystal display device 100 of the present embodiment.

In the liquid crystal display device (comparative example) 1000, one plate member 120 is attached to the upper end of the liquid crystal panel 10 in the horizontal direction, and the daylighting unit 140 is provided on the upper surface of the plate member 120. Further, the light collected by the daylighting unit 140 is sent to the light guide plate 32 of the irradiation unit 31 that irradiates the liquid crystal panel 10 with light.

Here, as shown in FIG. 9, when the sun 50 is located on the front side of the liquid crystal panel 10 and light (external light) 51 from the sun 50 is incident obliquely on the daylighting portion 140 of the plate-like member 120, the liquid crystal A shadow region 59 is generated in the upper part of the liquid crystal panel 10 of the display device 1000. That is, the plate-like member 120 of the liquid crystal display device 1000 becomes a roof (or eaves) that blocks the incidence of the external light 51, and a shadow region 59 is created in the upper part of the liquid crystal panel 10. When such a shadow region 59 is generated in the liquid crystal panel 10, it becomes difficult to display the entire liquid crystal panel 10 with uniform brightness. In particular, since the external light 51 is strong light, it is difficult to compensate for the darkness of the shadow region 59 of the liquid crystal panel 10.

On the other hand, in the case of the liquid crystal display device 100 according to the present embodiment, since the Y-shape is formed by the two plate-

like members

20A and 20B and the liquid crystal panel 10, the shadow region 59 shown in FIG. 9 is generated. Can be suppressed. That is, since it has the Y shape, the plate-like member 20A can be prevented from creating the shadow region 59, or even if the shadow region 59 is generated, the area thereof can be reduced. it can. Furthermore, even when the external light 51 is incident obliquely with respect to the vertical direction, the first surface 21 of the plate-like member 20B can receive the external light 51 almost in front. Therefore, the collected outside light 51 can be efficiently used as the light of the irradiation unit 31.

As described above, in the liquid crystal display device 100 of the present embodiment, the daylighting unit 40 is provided on each of the first surfaces 21 of the plurality of plate-like members 20 (20A, 20B) attached to the upper side portion 10a of the liquid crystal panel 10. (40A, 40B) are arranged. The lighting unit 40 (40A, 40B) is connected to the irradiation unit 31 that irradiates the liquid crystal panel 10 with light (58). The plurality of plate-like members 20 are two plate-

like members

20A and 20B, and the two plate-

like members

20A and 20B and the liquid crystal panel 10 form a Y shape.

Therefore, when the liquid crystal display device 100 of the present embodiment is used as an outdoor digital signage, the external light 51 is taken in using the plurality of plate-like members 20 (20A, 20B), and the light is emitted from the irradiation unit 31. Since it can utilize for light (55, 58), it can suppress that the digital signage installed outdoors feels dark with respect to external light. In addition, since the two plate-

like members

20A and 20B and the liquid crystal panel 10 form a Y shape, the shadow on the liquid crystal panel 10 caused by the plate-like member 20 when the external light 51 is irradiated from the front side. The influence of (59) can be mitigated. As a result, the daylighting type liquid crystal display device 100 capable of appropriately displaying an image can be realized.

Moreover, in the structure of this embodiment, since 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 (external light) that is remarkably stronger than the light of room lighting is used. Can be used. 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). In particular, when there is no daylighting unit 40, it is desirable to increase the light from the backlight to such an extent that it does not feel dark with respect to outside light, so that the power consumption of the backlight increases. On the other hand, in the configuration of the present embodiment, the increase in the power consumption of the backlight can be suppressed by using the external light 51 collected by the lighting unit 40.

Furthermore, 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 end face of the daylighting unit 40. Therefore, the power consumption can be reduced compared with the case where the lighting part 40 does not exist. In particular, when 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. However, in the configuration of the present embodiment, the daylighting unit Compared with the case where 40 does not exist, power consumption can be significantly reduced.

In addition, as compared with the liquid crystal display device (comparative example) 1000 provided with the plate member 120 having the daylighting section 140 as shown in FIG. 9, as described above, the liquid crystal display device 100 of the present embodiment. Has an advantage that the influence of the shadow (59) on the liquid crystal panel 10 caused by the plate-like member 20 when the external light 51 is irradiated from the front side can be reduced.

And in the structure of this embodiment, the control apparatus 61 is comprised so that the light quantity radiate | emitted from each LED element 30 by the LED drive part 63 may be controlled on the basis of the light quantity which each photosensor 46 detected. . Here, since the 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, the light 58 applied to the liquid crystal panel 10 can be made uniform, and as a result, an image can be appropriately displayed.

Further, since the control device 61 is connected to the movable portion 64 that rotates the plate-like member 20 (20A, 20B), the control device 61 rotates the plate-like member 20 in accordance with the orbit of the sun 50. It is possible. 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, contrary to the example shown in FIG. 10, when the sun 50 is located on the right side, the V-shaped structure composed of the plate-

like members

20A and 20B is on the right side with respect to the vertical direction (vertical direction). Tilt (for example, 15 ° to 45 ° to the right from the example shown in FIG. 10), both the daylighting portion 40A of the plate-like member 20A and the daylighting portion 40B of the plate-like member 20B are irradiated with the external light 51. Can be. Further, when the plate-

like members

20A and 20B can be independently rotated, in the example shown in FIG. 10, the plate-like member 20A is left as it is, and only the plate-like member 20B is on the right side (for example, , 45 ° to 90 °). 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.

In the liquid crystal display device 100 of this embodiment, 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. Such a transflective liquid crystal panel is disclosed in, for example, Japanese Patent Application Laid-Open No. 2007-219172. Specifically, 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.

When the liquid crystal panel 10 composed of a transflective liquid crystal panel is used, when the external light from the front is strong (for example, in the state shown in FIG. 10), the liquid crystal panel 10 can be used as a reflection mode. Specifically, 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). To enter the reflection mode. Here, 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. Further, if 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.

On the other hand, when the outside light from the front is weak and the sun 50 is located toward the back of the liquid crystal panel 10, the transflective liquid crystal panel 10 can be used as a transmission mode. Specifically, 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). To set the transmission mode. Here, 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.

In the above-described example, 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.

When the liquid crystal display device 100 of this embodiment includes the liquid crystal panel 10 made of a transflective liquid crystal panel, the plate-like member 20 (particularly 20A) can be controlled as follows. As shown in FIG. 11, 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, as described above, the liquid crystal panel 10 can be used as the reflection mode. it can. When used as the reflection mode, the daylighting unit 40A provided on the first surface 21 of the plate-like member 20A may not be used. Therefore, the solar cell panel 80 is provided on the second surface 22 of the plate-like member 20A 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 A is controlled by the control device 61 by tilting the second surface 22 so as to easily receive the external light 51. Of course, the electricity generated by the solar cell panel 80 can be used as power for driving the liquid crystal display device 100. Further, by rotating the plate-like member 20A in this way, an effect that it is possible to prevent the shadow region (the region 59 in FIG. 9) from being generated in the liquid crystal panel 10 can be obtained. In the example shown in FIG. 10, when used as a reflection mode, the first surface 21 and the second surface 22 of the plate-like member 20 B are interchanged, and the external light 51 is applied to the solar cell 80 disposed on the second surface 22. It is also possible to adopt a configuration in which power is generated by hitting.

In the above-described embodiment, the plate member 20 (20A, 20B) is attached to the upper side portion 10a of the liquid crystal panel 10. However, the present invention is not limited to this, and a configuration example as shown in FIG. In the liquid crystal display device 100 shown in FIG. 12, the plate-like member 20 (20 A, 20 B) has an extension 20 a, and the extension 20 a is attached to the upper side 10 a of the liquid crystal panel 10. In the example shown in FIG. 12, 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. (20A, 20B) are connected.

Moreover, as shown in FIG. 1, not only when attaching the plate-shaped member 20 (20A, 20B) to the upper side part 10a of the liquid crystal panel 10, if the said Y shape can be formed, the liquid crystal panel 10 will be shown. You may attach the plate-shaped member 20 to parts other than the upper side part 10a. For example, 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.

In the above-described embodiment, a configuration in which two flat plate-like members 20 are attached has been described. However, the present invention is not limited to this, and modifications can be made as shown in FIG. FIG. 13 shows a liquid crystal display device 100 including an arc-shaped plate member 20 (20A, 20B). In the configuration example shown in FIG. 13, the Y-shape is formed by the two plate-like members 20 A and 20 B and the liquid crystal panel 10. Further, in the example shown in FIG. 13, two arc-shaped plate-

like members

20A and 20B are used, but the two plate-

like members

20A and 20B are not separated members but are integrated members. It does not matter.

Furthermore, in the above-described embodiment, the LED elements 30 are arranged at the lower end of the irradiation unit 31, but the method of arranging the LED elements 30 is not limited thereto. For example, as shown in FIG. 14, the LED element 30 may be arranged with the LED element 30 A at the lower end of the irradiation unit 31 and with the LED element 30 B at the left end and the right end of the irradiation unit 31. It is also possible to arrange the LED elements 30 A at the lower end of the irradiation unit 31 and to arrange the LED elements 30 B only at one of the left end and the right 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.

In addition, in the above-described embodiment, 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. However, the configuration is not limited thereto, and a plurality of front light receiving sensors 35 are provided as shown in FIG. It can also be provided. In the case where there is one front light receiving sensor 35, when that portion is selectively shaded, the influence of the intensity of external light received by the front light receiving sensor 35 is exerted on the whole. On the other hand, when there are a plurality of front light receiving sensors 35, even if one front light receiving sensor 35 is selectively shaded, 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).

In the above-described embodiment, the optical sensor 46 is disposed on the surface of the daylighting unit 40, but the present invention is not limited thereto. For example, it is also possible to arrange the optical sensor 46 so as to detect the light amount of the daylighting part (light guide plate) 40 (or the optical connection member 41) in the plate-like member 20. Compared with the case where the optical sensor 46 is arranged on the surface of the daylighting unit 40, the light emitted from the light guide plate 32 of the irradiation unit 31 is more arranged when the optical sensor 46 is arranged to detect the light propagating to the daylighting unit 40. It becomes easy to predict the light quantity of 55.

In the above-described embodiment, the LED element 30 is disposed at the end of the irradiation unit 31. However, 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. In the example shown in FIG. 15, 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. In this example, the LED elements 30 are arranged between the reflection patterns 33. When the LED elements 30 are arranged in a matrix, area control of the liquid crystal panel 10 becomes easy. Thus, even when the LED elements 30 are arranged in a matrix, 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.

In addition, in the above-described embodiment, a light guide plate type structure is used as the daylighting unit 40 that collects the external light 51 and propagates the light. However, it is a member that collects the external light 51 and propagates the light. If there is, it is not limited to it. For example, the liquid crystal display device 100 including the daylighting unit 45 shown in FIGS. 16 and 17 can be modified. FIG. 16 and FIG. 17 schematically show a rear configuration and a side cross-section of the liquid crystal display device 100 including the daylighting unit 45, respectively.

The daylighting unit 45 in the illustrated example includes a condensing unit 42 that collects and collects external light 51, and an optical fiber 44 connected to the condensing unit 42. The optical fiber 44 is connected to the light guide plate 32 of the irradiation unit 31 that irradiates the liquid crystal panel 10 with light. As shown in FIG. 17, the optical fiber 44 may be connected to the light guide plate 32 via the optical connection member 41.

In the liquid crystal display device 100 shown in FIG. 16, a plurality of daylighting portions 45 are arranged on the first surfaces 21 of the plate-

like members

20A and 20B. Each daylighting unit 45 (45A, 45B) includes a plurality of condensing lenses 42. As shown in FIG. 17, 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 45 disposed on the first surface 21 of the plate-like member 20 (20A, 20B), and is then applied to the daylighting unit 45. The light 52 passes through the condenser lens 42 and is guided to the optical fiber 44. An optical connecting portion 43 is provided between the condenser lens 42 and the optical fiber 44.

FIG. 18 is an enlarged view showing a peripheral structure of the condenser lens 42 in the daylighting unit 45 of the present embodiment. Here, the external light 51 is applied to the surface of the daylighting unit 45, and the irradiation light 52 is collected by the condenser lens 42. Next, the condensed light 53 is guided to the end face (43) of the optical fiber 44 and propagates through the optical fiber 44. In the example shown in FIG. 18, 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. Note that 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.

As mentioned above, although this invention has been demonstrated by suitable embodiment, such description is not a limitation matter and, of course, various modifications are possible. For example, in the above-described embodiment, 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.

According to the present invention, a daylighting type liquid crystal display device (for example, digital signage) capable of appropriately displaying an image can be provided.

DESCRIPTION OF SYMBOLS 10 Liquid crystal panel 11 Frame area 12A Array board | substrate 12B CF board | substrate 14 Liquid crystal layer 15

Sealing agent

17A, 17B Polarizing plate 20 (20A, 20B) Plate-shaped member 20a Extension part 25 Rotating shaft 30 LED element 31 Irradiation part 32 Light guide plate 33 Reflection pattern 34 Reflective film 35 Front light receiving sensor 40 (40A, 40B) Daylighting part 41 Optical connecting member 42 Condensing part (condensing lens)
DESCRIPTION OF SYMBOLS 43 Optical connection part 44 Optical fiber 45 Daylighting part 46 Optical sensor 47 Cover part 50 Sun 51 External light 58 Irradiation light 59 Shadow area 61 Control apparatus 62 Liquid crystal panel drive part 63 LED drive part 64 Movable part 65 External system 66 External power supply 80 Sun Battery panel 90 Vertical direction 100 Liquid crystal display device 120 Plate member 140 Daylighting unit 1000 Liquid crystal display device

Claims

A liquid crystal display device capable of displaying an image,
LCD panel,
An irradiation unit for irradiating the liquid crystal panel with light;
A control device for controlling the driving of the liquid crystal panel;
A plurality of plate-like members attached to a part of the liquid crystal panel,
On each of the first surfaces of the plurality of plate-like members, a daylighting unit for collecting outside light and propagating light is disposed.
The daylighting unit is connected to the irradiation unit,
The plurality of plate members are two plate members,
The liquid crystal display device, wherein the two plate-like members and the liquid crystal panel form a Y shape.
The liquid crystal display device according to claim 1, wherein the first surface of the plate-shaped member is a surface positioned on an upper side when the liquid crystal panel is positioned on the lower side.
The first surface of the plate-like member is provided with a plurality of optical sensors that detect the amount of light,
In the irradiation part, a plurality of LED elements are arranged,
The control device is connected to an LED driving unit that controls the amount of light emitted from each of the plurality of LED elements,
The control device is connected to the optical sensor,
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 photosensor. Item 3. A liquid crystal display device according to item 1 or 2.
The liquid crystal display device according to claim 3, wherein the photosensor is composed of a photoelectric conversion element.
The plate-like member is rotatable about a rotation axis arranged around the upper side of the liquid crystal panel,
5. The liquid crystal display device according to claim 1, wherein a solar cell panel is disposed on a second surface of the plate-like member that is opposite to the first surface. 6.
The control device is connected to a movable control unit that controls the rotation of the plate-like member,
The liquid crystal display device according to claim 5, wherein the movable control unit is configured to control the rotation of the plate-shaped member in accordance with a solar orbit.
The irradiation unit includes a light guide plate,
The liquid crystal display device according to claim 1, wherein the daylighting unit is connected to the light guide plate of the irradiation unit.
The irradiation unit includes a light guide plate,
The daylighting unit includes a light collecting unit for collecting and collecting external light, and an optical fiber connected to the light collecting unit,
The liquid crystal display device according to claim 1, wherein the optical fiber is connected to the light guide plate of the irradiation unit.
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,
The control device is configured to perform switching between the transmission mode and the reflection mode in the transflective liquid crystal panel based on the light amount detected by the front light receiving sensor. The liquid crystal display device according to claim 1.
The liquid crystal display device according to claim 9, wherein the front light receiving sensor is disposed in a frame region of the liquid crystal panel.
The irradiation unit is an edge light type backlight unit,
The said control apparatus adjusts the light quantity radiate | emitted from each of these LED element arrange | positioned at the said irradiation part so that the variation in the light quantity which the said optical sensor detected may be reduced, It is characterized by the above-mentioned. Item 11. The liquid crystal display device according to any one of items 1 to 10.
The plate-like member is rotatable about a rotation axis arranged around the upper side of the liquid crystal panel,
A solar cell panel is disposed on the second surface located on the opposite side of the first surface of the plate-shaped member,
The control device is connected to a movable control unit that controls the rotation of the plate-like member,
The movable control unit is configured to control the rotation of the plate-like member according to the orbit of the sun,
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,
The control device is configured to perform switching between the transmission mode and the reflection mode in the transflective liquid crystal panel based on the light amount detected by the front light receiving sensor,
The controller is
When switching to the transmission mode, the movable control unit controls the rotation of the plate member so that the first surface of the plate member receives external light from the sun, and
When the mode is switched to the reflection mode, the movable control unit controls the rotation of the plate member so that the second surface of the plate member receives external light from the sun. The liquid crystal display device according to claim 1.
The liquid crystal display device according to any one of claims 1 to 12, wherein the liquid crystal display device is a display device for digital signage installed outdoors.