WO2012032745A1

WO2012032745A1 - Display device, display panel, display module, image display system, and image display method

Info

Publication number: WO2012032745A1
Application number: PCT/JP2011/004910
Authority: WO
Inventors: 裕志吉田; 千幸神徳
Original assignee: シャープ株式会社
Priority date: 2010-09-07
Filing date: 2011-09-01
Publication date: 2012-03-15

Abstract

A display device that can display information and function adequately as an advertising/identification medium even when in a power-saving state. Said display device is provided with: a scattering liquid-crystal display panel (200) comprising a memory liquid-crystal layer (36) sandwiched between transparent substrates; an image display panel (100) that forms a prescribed image; and an image display control unit (500). Said image display control unit sets the following areas in a display region (90): a light/dark image display area (710) in which a dark color is displayed by setting prescribed parts of the memory liquid-crystal layer (36) to a light-transmitting state and a light color is displayed by setting the rest of the memory liquid-crystal layer (36) to a light-scattering state, thereby displaying a light/dark image (711) comprising a combination of said dark color and light color; and a prescribed-image display area (720) in which the memory liquid-crystal layer (36) is set to a light-transmitting state, thereby displaying, through the scattering liquid-crystal display panel (200), the prescribed image (721) formed by the image display panel (100).

Description

Display device, display panel, display module, image display system, and image display method

The present invention relates to a display device, a display panel, a display module, an image display system, and an image display method used for digital signage and the like. The present invention relates to an image display system and an image display method.

In recent years, with the development of digital technology, it is called digital signage as shown in

Patent Documents

1 and 2, which advertises by playing high-quality video such as high-definition image quality on the display of the image display panel outdoors or in stores. System exists.

Digital signage can distribute advertisements and the like by distributing and displaying moving images and still images on an image display panel using a network or the like. Since this digital signage display has the advantages of being thin, light and low power consumption, for example, a liquid crystal display panel is often used as an image display panel.

However, in a general digital signage system, when advertisement distribution is not performed, nothing is displayed with the image display panel turned off to save power consumption. Therefore, no information is displayed on the display of the image display panel, and the advertising and advertising functions are insufficient.

Therefore, even when the image display panel is in a power saving state, a pair of substrates sandwiching liquid crystal is provided so that predetermined characters, pictures, patterns, etc. can be displayed on the display, and light is reflected on the pair of substrates. Patent Document 3 discloses a liquid crystal display device having a display region in which a plurality of subpixels each having a region and a light transmission region are formed.

This liquid crystal display device is configured such that the light reflection region and the light transmission region of each of the plurality of sub-pixels are driven independently of each other. When the power is turned off, the light reflection region is temporarily DC-driven to display a specific image. By displaying the power off after the display, the specific image is continuously displayed on the display even in the power saving state.

Japanese Patent Laid-Open No. 2002-125052 JP 2001-209705 A JP 2009-229967 A

However, in this liquid crystal display device, since the same image is continuously displayed on the display when the power is turned off, it cannot be sufficiently used as an information transmission medium for advertisements and advertisements.

The present invention has been made in view of such problems, and a display device, a display panel, a display module, an image display system, and an image capable of displaying information that can be sufficiently used as an advertisement / identification medium even in a power saving state. An object is to provide a display method.

In order to achieve the above object, in the present invention, a light scattering liquid crystal display panel configured by sandwiching a light scattering liquid crystal layer between transparent substrates, and disposed on the back side of the light scattering liquid crystal display panel, A display device having an image display panel for forming an image, and a light / dark image display area for displaying a light / dark image composed of a combination of light color display and dark color display in a display area of a display surface of the display device; A predetermined image display area for displaying a predetermined image formed on the display panel. Here, the light color display is a color display with a high degree of brightness, and is not particularly limited, but for example, white, cream, light cyan, yellow, silver, light gray, etc. It is a bright, bright, chromatic or achromatic display. The dark color display is a color display with a low degree of brightness, and is not particularly limited. For example, in addition to black, brown, amber, dark green, oil color, etc. It is a display of chromatic or achromatic color. Here, the predetermined image is a predetermined image formed on the image display panel, is an image including at least one of characters, figures, and symbols, includes both moving images and still images, Although not particularly limited, for example, a news telop, a television image, a music movie, a CM movie, a movie movie, or an evacuation instruction image at the time of a disaster.

Specifically, the display device according to the first aspect of the present invention includes a light scattering liquid crystal display panel in which a light scattering liquid crystal layer is sandwiched between transparent substrates, and a back side of the light scattering liquid crystal display panel. An image display panel arranged to form an image, and a dark color display for bringing the light-scattering liquid crystal layer into a light-transmitting state in a display area of the display surface, and the dark color display. By combining a bright color display in which the light scattering liquid crystal layer is in a light scattering state at different locations, a light / dark image display area for displaying a light / dark image, and the light scattering liquid crystal layer in a light transmissive state, An image display control unit that controls to set a predetermined image display area for displaying a predetermined image formed on the image display panel via the light-scattering liquid crystal display panel is provided.

According to the configuration of the present invention, the bright / dark image is displayed in the power saving state in the light / dark image display area while displaying the predetermined image in the predetermined image display area, and the advertisement / identification function is exhibited. However, it is possible to display information that can be used sufficiently as an advertisement / identification medium.

In addition, the image display control unit includes a plurality of light receiving sensors that receive external light applied to the display area of the display surface of the display device, and the image display control unit sets a reference value in advance for the light receiving information obtained by the light receiving sensor. It is preferable that the predetermined image display area and the bright and dark image display area are set based on the light reception information when the light reception information that is determined and exceeds the reference value is obtained by the light reception sensor. Here, the external light means light emitted from other than the display device. For example, even when the display device is placed indoors, it does not matter whether the light is emitted by indoor lighting or from outside the room.

According to this configuration, since the predetermined image display area is provided in a relatively dark area where no external light is irradiated and the predetermined image is displayed there, it is difficult for the predetermined image to be difficult to see due to the external light. Further, since the bright and dark image is displayed in the region irradiated with the external light, the bright color display is clearly displayed on the light scattering liquid crystal layer in the light scattering state, and the bright and dark image can be displayed with high contrast.

Further, it is preferable that the image display control unit changes the size of the light / dark image according to the size of the light / dark image display area. According to this configuration, since the size of the light / dark image is changed according to the changed size of the light / dark image display area, the light / dark image can be appropriately displayed to the observer.

Further, it is preferable that the image display control unit changes the size of the predetermined image according to the size of the predetermined image display area. According to this configuration, since the size of the predetermined image is changed according to the changed size of the predetermined image display area, the predetermined image can be appropriately displayed to the observer.

In addition, the image display control unit may include the predetermined image display area in an area excluding a part in the display area where the received light information exceeding the reference value is obtained based on the received light information obtained by the light receiving sensor. It is possible to set the main area. According to this configuration, since the main area of the predetermined image can be displayed in a relatively dark area that is not irradiated with external light, most of the predetermined image can be displayed to the observer. Here, when the main area of the predetermined image display area is set in an area excluding the part where the light reception information exceeding the reference value is obtained, the light reception information in which most of the predetermined image display area exceeds the reference value is set. It means that it belongs to the area excluding the obtained part and the observer can recognize the predetermined image. Although not particularly limited, for example, 70% to 99% of the area of the predetermined image display area, Preferably 80% to 99%, more preferably 90% to 99%, belongs to a region excluding a region where light reception information exceeding the reference value is obtained.

Further, the image display control unit is configured to display at least the predetermined image in an area excluding a part of the display area where light reception information exceeding the reference value is obtained based on light reception information obtained by the light reception sensor. It is possible to set so that the center part of an area is located. The observer's attention tends to go to the center of the image. According to this configuration, the center of the predetermined image can be displayed in a relatively dark area not irradiated with external light. It can be displayed to the observer.

In addition, the image display control unit may include the predetermined image display area in an area excluding a part in the display area where the received light information exceeding the reference value is obtained based on the received light information obtained by the light receiving sensor. Can be set. According to this configuration, since the predetermined image can be displayed in a relatively dark area where no external light is irradiated, the predetermined image can be accurately displayed to the observer.

Further, the image display control unit sets the main area of the bright and dark image display area in an area in the display area where the received light information exceeding the reference value is obtained based on the received light information obtained by the light receiving sensor. It is possible to set. According to this configuration, since the main area of the bright and dark image can be displayed in an area that exceeds the reference value, most of the bright and dark images can be displayed to the observer with good contrast. Here, setting the main region of the light / dark image display area in the region where the light reception information exceeding the reference value is obtained means that the region where the light reception information exceeding the reference value is obtained in most regions of the light / dark image display area And that the observer can recognize a bright and dark image, and is not particularly limited. For example, 70% to 99%, preferably 80% to 99% of the bright and dark image display area, More preferably, it means that 90% to 99% belongs to a region where received light information exceeding the reference value is obtained.

Further, the image display control unit places a central portion of the light / dark image display area in an area where the light receiving information exceeding the reference value is obtained in the display area based on the light receiving information obtained by the light receiving sensor. It is possible to set. Since the observer's attention tends to go to the center of the image, according to this configuration, the center of the light / dark image can be displayed in a bright area that exceeds the reference value, so that an easy-to-see light / dark image is displayed to the observer. It becomes possible.

Further, the image display control unit sets the light / dark image display area in a region where light reception information exceeding the reference value is obtained in the display region based on light reception information obtained by the light reception sensor. Is possible. According to this configuration, since the bright and dark image can be displayed in the area irradiated with external light, the entire bright and dark image can be displayed to the observer with good contrast.

In addition, when the image display control unit divides the display area into two areas of right and left or upper and lower areas that are equal to each other, the area of the portion of the two areas where the received light information exceeding the reference value is obtained. It is possible to set the predetermined image display area in one area having a small size and set the bright and dark image display area in the other area.

According to this configuration, when the display area is irradiated with external light that exceeds the reference value, the arrangement of the predetermined image display area and the light and dark image display area is appropriately switched by setting the left and right or up and down positions by the image display control unit. Therefore, the control by the image display control unit can be simplified and an image can be displayed to the observer.

Further, an altitude reference value higher than the reference value is predetermined for the light receiving information obtained by the light receiving sensor, and when the light receiving information exceeding the altitude reference value is obtained by the light receiving sensor, The image display control unit sets the predetermined image display area and the light / dark image display area in an area excluding a part of the display area where the received light information exceeding the altitude reference value is obtained based on the received light information. Is possible.

When external light with high intensity is irradiated on the display area, setting a light / dark image display area in the direct light irradiation area of the external light may make it difficult to see the light / dark image. When external light with high intensity is directly irradiated onto the display area, both the dark image display area and the predetermined image display area are set to a relatively dark area other than the direct irradiation area with high intensity external light. Both the dark image display area and the predetermined image display area can be accurately displayed to the observer.

Also, an altitude reference value higher than the reference value is predetermined for the light receiving information obtained by the light receiving sensor, and the area where the light receiving information exceeding the altitude reference value is obtained by the light receiving sensor is the display area. In a case where a certain ratio is exceeded with respect to the area, the image display control unit can temporarily stop displaying an image in the display area.

If external light with high intensity is directly irradiated onto the display area and the area exceeds a certain ratio with respect to the area of the display area, the dark image display area and the predetermined image display area are both relatively dark areas. Even if it is set, the image size of the dark image and the predetermined image will be small. However, according to this configuration, the power supply for driving the display device is prevented by not displaying an image with insufficient advertising / identification function. Can save consumption.

In addition, an altitude reference value higher than the reference value is predetermined for the light reception information obtained by the light reception sensor, and light reception information exceeding the altitude reference value is received in the center portion of the display area. The image display control unit can temporarily stop displaying an image in the display area.

Since the center of the display area is easy to enter the viewer's field of view, if it becomes difficult to see the center of the display area, it is difficult to grasp the contents of the entire display image. Since the unit stops displaying an image in the display area when it becomes difficult to see the center of the display area, it is possible to suppress the stress of the observer due to the display of the difficult-to-view image.

Further, the image display control unit continues the predetermined time and receives the light receiving information exceeding the reference value by the light receiving sensor, based on the light receiving information, the predetermined image display area. The bright and dark image display area can be set.

For example, when external light that illuminates the display area is temporarily interrupted, for example, when a person passes in front of the display device for a moment, the light reception information obtained by the light receiving sensor temporarily changes, and is obtained at this time. When the image display is controlled based on the light reception information, the frequency of changing the image display increases and the image display flickers. According to this configuration, the image display control unit continues to be constant at a predetermined time. When the received light information is obtained by the light receiving sensor, the image display is controlled on the basis of the fixed received light information, so that the flickering of the image display hardly occurs.

Further, it is preferable that the light receiving sensors are arranged in a dispersed manner in the display area. According to this configuration, it is possible to detect the intensity of external light at various locations in the display area, and control can be performed with higher accuracy.

In addition, the light receiving sensors may be arranged in regions where the pixels are formed in a plan view of the liquid crystal panel. According to this configuration, it is possible to accurately detect the intensity of external light at each pixel.

Further, the light receiving sensors may be distributed along a line set so as to traverse or longitudinally cross the display area. According to this configuration, the brightness of the external light can be detected along a line set so as to traverse or vertically cross the display area, and the number of light receiving sensors can be reduced.

The display area may be rectangular, and the light receiving sensor may be arranged in the display area along a line connecting the midpoints of at least two opposite sides of the four sides of the display area. is there. According to this configuration, it is possible to obtain light reception information that roughly reflects the luminance distribution of the external light that irradiates the entire display area.

Further, the display area may be rectangular, and the light receiving sensor may be disposed on a peripheral portion of the display area along at least two opposite sides of the four sides of the display area. According to this configuration, since a decrease in the aperture ratio can be reduced as compared with the case where the light receiving sensor is arranged at the center of the display area, a decrease in luminance of the display image is not easily recognized by the user.

The display area may be rectangular, and the light receiving sensor may be disposed along at least one of the diagonal lines of the display area. Also with this configuration, it is possible to obtain light reception information that roughly reflects the luminance distribution of the external light that irradiates the entire display region.

Further, priority information indicating the priority of the display image is predetermined for each display image, and the image display control unit sets the predetermined image display area and the light and dark image display area based on the priority information. It is also possible to do.

According to this configuration, since the predetermined image display area and the light / dark image display area are set based on the priority information of the display image, it is possible to accurately display information desirable for the observer.

Further, it is preferable that the priority of the priority information is changed depending on time. According to this configuration, it is possible to change the priority information of the display image in real time, for example, and thus it is possible to display information desirable for the observer more accurately.

Further, the image display control unit can set the predetermined image display area and the light / dark image display area based on the display content of the display image.

According to this configuration, since the predetermined image display area and the light / dark image display area are set based on the display content of the display image, a display that is easy for the observer to see is possible.

Further, the image display control unit can set a third area other than the predetermined image display area and the bright and dark image display area in the display area of the display surface of the display device.

According to this configuration, a variety of display modes are possible by using the third area in various forms.

Also, it is possible not to display an image in the third area. According to this configuration, it is possible to save power by the ratio of the third area in the display area.

Further, the image display panel is a liquid crystal display panel configured by sandwiching a liquid crystal layer between transparent substrates, a backlight for irradiating illumination light to the back side of the liquid crystal display panel, lighting of the backlight, and And a backlight control unit that controls a light-off state. According to this configuration, the display device can be configured with low power consumption and a thin shape.

Further, it is preferable that the image display control unit sets a liquid crystal layer of the liquid crystal display panel corresponding to the light and dark image display area to a light non-transmissive state. According to this configuration, since the liquid crystal layer of the liquid crystal display panel corresponding to the light and dark image display area is in a light non-transmissive state, the light from the back side of the liquid crystal display panel does not pass through the liquid crystal display panel, and thus the light scattering property A dark color display formed at a predetermined position on the liquid crystal display panel can be clearly displayed.

Further, the backlight control unit turns on the backlight corresponding to the predetermined image display area, while turning off the backlight corresponding to the light and dark image display area, or turns on the backlight in a low power consumption state. Is also possible. Here, to turn on the backlight in a low power consumption state means to turn on an illumination part of the backlight dimly to keep power consumption low. According to this configuration, an image can be brightly displayed by backlight illumination at a location corresponding to the predetermined image display area, while the backlight is turned off or in a low power consumption state at a location corresponding to the light / dark image display area. Since it is turned on, power saving can be achieved.

The backlight includes a plurality of light emitting units, and the backlight control unit turns on the backlight corresponding to the predetermined image display area, while the backlight corresponding to the light and dark image display area It is also possible to turn on a part of the light emitting part and turn off the other part of the light emitting part of the backlight corresponding to the bright and dark image display area. In this configuration, the contrast of bright / dark image display is improved, and only a part of the backlight is lit at a location corresponding to the bright / dark image display region, so that power saving can be achieved.

Further, the image display panel is a liquid crystal display panel configured by sandwiching a liquid crystal layer between transparent substrates, a backlight for irradiating illumination light to the back side of the liquid crystal display panel, lighting of the backlight, and A backlight control unit that controls a light-off state, a light-out period in which the backlight is turned off, and an intermittent drive control unit that alternately switches between a lighting period in which the backlight is turned on, and the image display control unit includes: It is also possible to set the predetermined image display area and the light / dark image display area based on light reception information obtained by the light reception sensor when the backlight is turned off by the intermittent drive control unit.

According to this configuration, it is possible to set the light / dark image display area and the predetermined image display area by accurately reflecting the external light that irradiates the display area based on the light reception information that does not include the illumination light.

The light receiving sensor may be disposed inside the light scattering liquid crystal display panel. According to this configuration, it is possible to easily detect the external light applied to the display area accurately.

In addition, the light receiving sensor may be disposed inside the liquid crystal display panel. Also with this configuration, it is possible to detect the external light irradiated on the display area.

Further, the light receiving sensor may be disposed in the backlight. According to this configuration, since the light receiving sensor can be arranged in the display area without covering the opening formed in the display pixel of the light-scattering liquid crystal display panel, a decrease in the aperture ratio of the display pixel can be prevented.

In addition, the light receiving sensor may be disposed between the liquid crystal display panel and the backlight. According to this configuration, since the light receiving sensor is not provided directly on the light scattering liquid crystal display panel, the liquid crystal display panel, or the backlight, the light receiving sensor can be used without changing the structure of the light scattering liquid crystal display panel, the liquid crystal display panel, or the backlight. A sensor can be provided.

Further, it is preferable that the transparent substrate on the front side of the image display panel and the transparent substrate on the back side of the light-scattering liquid crystal display panel are commonly used as one transparent substrate. According to this configuration, it is possible to prevent a decrease in light transmittance due to the overlapping of the plurality of transparent substrates, and it is possible to reduce the thickness of the display device.

The light-scattering liquid crystal layer is preferably a memory liquid crystal layer. Here, the memory liquid crystal layer is a liquid crystal having a plurality of optical states and maintaining a specific state (memory characteristics) without forming an electric field.

According to this configuration, even when the application of an electric field is stopped, the display of bright and dark images on the light-scattering liquid crystal display panel is maintained due to the memory characteristic that the liquid crystal molecules in the memory liquid crystal layer maintain the alignment state. Suppression can be promoted.

In addition, data including at least one of video data and audio data of digital signage content distributed via the digital broadcast wave of the Internet or a broadcasting station is received, and the received digital signage content is converted into the light scattering property. It is preferable to display on at least one of a liquid crystal display panel and the image display panel.

According to this configuration, for example, an advertisement composed of a plurality of images can be suitably viewed by an observer (customer) who has visited a store or the like, and is installed outdoors, for example, and easily affected by external light. It can be suitably used for an information display.

The light-scattering liquid crystal display panel is composed of a plurality of individual light-scattering liquid crystal display panels configured by sandwiching a light-scattering liquid crystal layer between transparent substrates to form one display panel as a whole. In addition, the image display panel may be a collection of a plurality of individual image display panels that form an image to form a single display panel as a whole.

According to this configuration, a large display device such as an information display or billboard display used as an information transmission medium such as a signboard, an advertisement, or a sign installed outdoors can be configured.

In addition, it is preferable that the image display control unit controls the individual light scattering liquid crystal display panel and the individual image display panel independently of each other. According to this configuration, since the light / dark image display area and the predetermined image display area can be set at the individual display unit partition composed of the light-scattering liquid crystal display panel and the image display panel, display is performed in units of display units. Alternatively, non-display is possible and further power saving is possible.

A display panel according to a second aspect of the present invention is disposed on a light scattering liquid crystal display panel in which a light scattering liquid crystal layer is sandwiched between transparent substrates, and on the back side of the light scattering liquid crystal display panel. An image display panel for forming an image, and a dark color display in which the light scattering liquid crystal layer is in a light transmitting state in a display area of a display surface, and a light scattering liquid crystal layer at a location different from the dark color display By combining light-colored display in a light-scattering state, a light-dark image display area for displaying a light-dark image, and a light-transmitting liquid crystal layer in a light-transmitting state, a predetermined formed on the image display panel And a predetermined image display area for displaying an image via the light-scattering liquid crystal display panel.

A display module according to a third aspect of the present invention is disposed on a light scattering liquid crystal display panel in which a light scattering liquid crystal layer is sandwiched between transparent substrates, and on the back side of the light scattering liquid crystal display panel. A display module comprising an image display panel for forming an image and a plurality of light receiving sensors for receiving external light irradiated on a display area of a display surface, wherein the light receiving information obtained by the light receiving sensor A reference value is determined in advance, and when light reception information exceeding the reference value is obtained by the light reception sensor, based on the light reception information, dark display that makes the light-scattering liquid crystal layer in a light transmission state, In addition, by combining a light color display in which the light scattering liquid crystal layer is in a light scattering state at a different location from the dark color display, a light / dark image display area for displaying a light / dark image and light transmission through the light scattering liquid crystal layer By setting the state, a predetermined image display area for displaying a predetermined image formed on the image display panel via the light-scattering liquid crystal display panel is set in the display area of the display surface. It is characterized by.

An image display system according to a fourth aspect of the present invention includes a light-scattering liquid crystal display panel in which a light-scattering liquid crystal layer is sandwiched between transparent substrates, and a back side of the light-scattering liquid crystal display panel. An image comprising: a display device having an image display panel that is arranged to form an image; and an external processing device that creates an image signal for displaying an image in a display area of a display surface and sends the image signal to the display device In the display system, in the display area of the display surface, a dark color display in which the light scattering liquid crystal layer is in a light transmission state, and a light in which the light scattering liquid crystal layer is in a light scattering state at a location different from the dark color display. By combining the color display, a light / dark image display area for displaying a light / dark image and the light scattering liquid crystal layer in a light transmission state, the predetermined image formed on the image display panel is transferred to the light scattering liquid crystal. display Characterized in that it comprises an image display control unit that sets to have a predetermined image display area for displaying through the panel, the.

An image display method according to a fifth aspect of the present invention includes a light-scattering liquid crystal display panel in which a light-scattering liquid crystal layer is sandwiched between transparent substrates, and a back side of the light-scattering liquid crystal display panel. And a display device having an image display panel for forming an image, a dark color display for making the light-scattering liquid crystal layer in a light transmission state in a display area of a display surface, and a place different from the dark color display By combining the bright color display that brings the light-scattering liquid crystal layer into the light-scattering state, the light-dark image display area for displaying the light-dark image, and the light-scattering liquid crystal layer in the light-transmitting state, the image display An image is displayed so as to have a predetermined image display area for displaying a predetermined image formed on the panel via the light scattering liquid crystal display panel.

In the present invention, in the display area of the display surface of the display device, a light / dark image display area for displaying a light / dark image composed of a combination of light color display and dark color display, and a predetermined image for displaying a predetermined image formed on the image display panel And a display area. In the bright and dark image display area, the light scattering liquid crystal layer is light-transmitted in a predetermined position to perform dark color display, and the light scattering liquid crystal layer is light scattered in other positions to perform light color display. A bright and dark image composed of a combination of the bright color display and the dark color display is displayed. In the predetermined image display area, the light-scattering liquid crystal layer of the light-scattering liquid crystal display panel is set in a light transmitting state, thereby displaying a predetermined image formed on the image display panel via the light-scattering liquid crystal display panel.

According to the present invention, the light-scattering liquid crystal layer of the light-scattering liquid crystal display panel is set in a light-scattering state to perform bright color display at a predetermined location on the light-scattering liquid crystal display panel, and in a light-transmitting state. By performing the dark color display performed at the location, an image composed of the combination of the bright color and the dark color display is displayed in the light / dark image display area, so that the identification information can be displayed in the power saving state. In addition, since the predetermined image formed on the image display panel is displayed in the predetermined image display area, the advertisement information can be displayed.

It is explanatory drawing explaining the outline of the whole display apparatus. It is sectional drawing which illustrates the cross section of a display apparatus roughly. It is a partially expanded plan view which shows a backlight schematically. It is sectional drawing of the display apparatus whose transparent substrate of the front side of an image display panel and the transparent substrate of the back side of a light-scattering liquid crystal display panel are one transparent substrate. It is an active matrix circuit configuration diagram of a light-scattering liquid crystal display panel. It is the schematic of the process of forming a polycrystalline silicon film on a substrate. It is the schematic of the process of forming the active layer of a thin-film transistor. It is the schematic of the process of forming a gate electrode. It is the schematic of the process of forming a 1st interlayer insulation film. It is the schematic of the process of forming a source / drain electrode. It is the schematic of the process of forming a pixel electrode. It is a block diagram of a digital signage system via the Internet. It is a figure which shows the specific example which sets and displays a light-and-dark image display area and a predetermined image display area in a display area. It is sectional drawing which illustrates roughly the usage condition of a display apparatus. It is a block diagram which illustrates roughly the structure of a display apparatus. It is detailed sectional drawing of the light-scattering liquid crystal display panel explaining the arrangement position of a light reception sensor. It is sectional drawing explaining arrangement | positioning of the color filter layer about the whole display apparatus. It is a block diagram which shows typically the wiring structure and control part of a display apparatus. It is a circuit diagram which shows the structure of a pixel. It is a block diagram explaining one specific example of a structure of an image display control part. It is a flowchart explaining one specific example of the control method of a display apparatus. It is a top view which shows the display apparatus with which sunlight as external light is directly irradiated to the display area. It is a figure explaining the modification of the display mode of the bright-and-dark image display area and the predetermined image display area in case external light is directly irradiated to the display area. It is a figure explaining the modification of the display mode of the bright-and-dark image display area and the predetermined image display area in case external light is directly irradiated to the display area. It is a figure explaining the modification of the display mode of the bright-and-dark image display area and the predetermined image display area in case external light is directly irradiated to the display area. It is a figure which is the modification of the display mode of the bright-and-dark image display area and the predetermined image display area when external light is directly irradiated to the display area, and is a diagram in which a third area is displayed. It is a figure which is the modification of the display mode of the bright-and-dark image display area and the predetermined image display area when external light is directly irradiated to the display area, and is a diagram in which a third area is displayed. FIG. 5 is a modification of the display mode of the bright / dark image display area and the predetermined image display area when external light is directly applied to the display area, and is a diagram in which the predetermined image display area and the bright / dark image display area are switched up and down and displayed. It is. This is a modification of the display mode of the bright and dark image display area and the predetermined image display area when external light having high intensity is directly irradiated on the display area. Both the dark image display area and the predetermined image display area 720 are relatively It is a figure arrange | positioned at a dark area | region. FIG. 10 is a block diagram of a display device that is a modification of the arrangement of the light receiving sensors and schematically shows the arrangement along the line connecting the midpoints of two opposite sides of the four sides of the display region. FIG. 10 is a block diagram of a display device that is a modification of the arrangement of the light receiving sensors and schematically shows the arrangement along the line connecting the midpoints of two opposite sides of the four sides of the display region. FIG. 10 is a block diagram of a display device that is a modification of the arrangement of the light receiving sensors and schematically shows the arrangement of the light receiving sensors along at least two opposite sides of the four sides of the display area 90 in the peripheral portion of the display area. FIG. 10 is a block diagram of a display device that is a modification of the arrangement of the light receiving sensors and schematically shows the arrangement of the light receiving sensors along at least two opposite sides of the four sides of the display area 90 in the peripheral portion of the display area. FIG. 10 is a block diagram of a display device that is a modification of the arrangement of the light receiving sensors and schematically shows the arrangement of the light receiving sensors along at least one diagonal line of the display region. It is a modification of the arrangement of the light receiving sensor, and is a block diagram of a display device schematically showing the arrangement at the center of each side in the peripheral part of the display area. FIG. 10 is a block diagram of a display device that is a modification of the arrangement of the light receiving sensors and schematically shows the arrangement at the four corners of the peripheral portion of the display region. FIG. 10 is a block diagram of a display device that is a modification of the arrangement of the light receiving sensors and schematically shows an arrangement in which the display area is divided into a plurality of areas and the light receiving sensors are associated with the positions. It is sectional drawing which expands and shows the structure of a liquid crystal panel, and is a figure which shows the state arrange | positioned so that a light reception sensor may be covered with a black matrix. It is sectional drawing which expands and shows the structure of a liquid crystal panel, and is a figure which shows the state by which the light reception sensor is arrange | positioned in the black matrix. FIG. 3 is a partially enlarged plan view schematically showing a backlight, and is a diagram showing a state in which a light receiving sensor is arranged in the backlight. It is a top view which shows one specific example of the display apparatus which displayed the brightness image and the predetermined image on the display area in consideration of the priority information of an image. It is a top view which shows the specific example of the display apparatus which displayed the bright-and-dark image and the predetermined image, when the priority information of an image was changed in a different time slot | zone. It is a top view which shows the specific example of the display apparatus which displayed the brightness image and the predetermined image on the display area in consideration of the display content of a display image. It is a figure explaining the display form which turns off the irradiation part corresponding to the location where a dark color display is formed in a light-dark image display area, and turns on the irradiation part corresponding to the location where a bright color display is formed. It is a block diagram which shows typically the wiring structure and control part of a display apparatus provided with the intermittent drive control part. It is a timing chart which shows the intermittent drive of a backlight. It is a figure explaining embodiment which performs a color display by mixing a pigment | dye in a memory liquid crystal layer, and is a figure which shows the case where the emitted light of the mixed pigment | dye is absorbed. It is a figure explaining embodiment which performs a color display by mixing a pigment | dye in a memory liquid crystal layer, and is a figure which shows the case where the emitted light of the mixed pigment | dye is irradiated outside. It is a figure explaining the display mode which makes the viewing angle dependence of the image of a predetermined image display area variable, and is a figure which shows the case where the display with little visual dependence is performed. It is a figure explaining the display mode which makes the viewing angle dependence of the image of a predetermined image display area variable, and is a figure which shows the case where a display with much visual dependence is performed. It is explanatory drawing of the display apparatus which formed the reflecting mirror board. The figure explaining the display screen of the display apparatus which comprised the display unit which comprised the single light-scattering liquid crystal display panel and the single liquid crystal display panel, and comprised the display unit in the matrix form, and comprised the display area. It is. FIG. 6 is a diagram for explaining a state in which a bright / dark image display area and a predetermined image display area are set when external light is irradiated on the display area in a display device in which display units are arranged in a matrix to form a display area. . It is a block diagram which shows a display module typically.

Embodiment 1
Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. However, the embodiments are for facilitating understanding of the principle of the present invention, and the scope of the present invention is as follows. The present invention is not limited to the embodiments, and other embodiments in which those skilled in the art appropriately replace the configurations of the following embodiments are also included in the scope of the present invention.

FIG. 1 is an explanatory diagram of the entire display device 900 according to the present embodiment. In the present embodiment, for example, the liquid crystal display panel 100 is used as the image display panel. As shown in FIG. 1, a display device 900 includes a liquid crystal display panel 100 that displays an image during normal use, a backlight 300 that irradiates illumination light to the back side of the liquid crystal display panel 100, and a light-scattering liquid crystal layer. A light scattering liquid crystal display panel 200 sandwiched between substrates, an image display control unit 500, and a backlight control unit 501 for controlling the lighting and extinguishing states of the backlight 300 are configured. The liquid crystal display panel 100 is disposed to face the back side (that is, the backlight side) of the light scattering liquid crystal display panel 200.

FIG. 2 is a cross-sectional view of the display device 900 according to the present embodiment. As shown in FIG. 2, the light-scattering liquid crystal display panel 200 is, for example, an active matrix type liquid crystal display panel, and includes, for example, a second transparent substrate 12 that is an array substrate disposed on the back side, and a second transparent substrate. Memory liquid crystal as a light scattering liquid crystal layer sandwiched between a first transparent substrate 11 and a second transparent substrate 12, for example, a first transparent substrate 11 that is disposed on the front side facing the substrate 12. Layer 36.

In order to prevent leakage of the memory liquid crystal layer 36, the periphery of the first transparent substrate 11 and the second transparent substrate 12 is sealed with a sealing material 29. The memory liquid crystal of the memory liquid crystal layer 36 is not particularly limited. For example, a ferroelectric liquid crystal or a cholesteric liquid crystal having excellent memory characteristics can be used.

For example, a counter electrode 25 is formed on the inner surface of the first transparent substrate 11, that is, the back surface, and a pixel electrode 23 is formed on the inner surface of the second transparent substrate 12, that is, the front surface. The counter electrode 25 is given a predetermined counter potential from an external drive circuit (not shown).

A liquid crystal display panel 100 is disposed on the back side of the light scattering liquid crystal display panel 200. The liquid crystal display panel 100 is also an active matrix type liquid crystal display panel, for example, and is disposed on the front side facing the fourth transparent substrate 14 and the fourth transparent substrate 14 that is, for example, an array substrate disposed on the back side. For example, it has the 3rd transparent substrate 13 which is a counter substrate, and the liquid crystal layer 26 pinched | interposed between the 3rd transparent substrate 13 and the 4th transparent substrate 14. FIG. The third transparent substrate 13 of the liquid crystal display panel 100 and the second transparent substrate 12 of the light scattering liquid crystal display panel 200 are disposed to face each other.

In order to prevent leakage of the liquid crystal layer 26, the periphery of the third transparent substrate 13 and the fourth transparent substrate 14 is sealed with a sealing material 39. Although it does not specifically limit as the liquid crystal layer 26, For example, TN (twistedmaticnematic) type, GH (guest-host) type, STN (super-twistednematic) type, SBE (super-twistedbirefringence effect) type, ECB (Electrically controlled birefringence) shape etc. can be used.

For example, a counter electrode 35 is formed on the inner surface of the third transparent substrate 13, that is, the back surface, and a pixel electrode 33 is formed on the inner surface of the fourth transparent substrate 14, that is, the front surface. A predetermined counter potential is applied to the counter electrode 35 from an external drive circuit (not shown). On the outside of the third transparent substrate 13 and the fourth transparent substrate 14, a normal absorption type upper polarizing plate 32 and a lower polarizing plate 31 arranged in crossed Nicols are formed.

Although it does not specifically limit as the 1st transparent substrate 1, the 2nd transparent substrate 12, the 3rd transparent electrode, and the 4th transparent electrode, For example, the board | substrate which has light transmittances, such as a glass plate and a quartz plate, is used. can do. The

pixel electrodes

23 and 33 and the

counter electrodes

25 and 35 are formed of a light transmissive conductive material such as ITO (indium tin oxide).

The liquid crystal display panel 100 and the light-scattering liquid crystal display panel 200 are arranged with a predetermined interval through, for example, a spacer, but are not limited thereto, and the liquid crystal display panel 100 and the light-scattering liquid crystal display panel 200 are arranged. The second transparent substrate 12 of the light-scattering liquid crystal display panel 200 and the third transparent substrate 13 of the liquid crystal display panel 100 can be disposed in close contact with each other.

A backlight 300 is disposed on the back side of the liquid crystal display panel 100. FIG. 3 is a partially enlarged plan view schematically showing the backlight 300. As illustrated in FIG. 3, the backlight 300 includes a backlight chassis 301 that is a substantially rectangular casing. An opening is formed on the front side of the backlight chassis 301. As shown in FIG. 3, the backlight 300 includes a plurality of irradiation units 302 that irradiate light to the back surface of the liquid crystal display panel 100. The irradiating unit 302 includes a plurality of point light sources 302a. By controlling each of the irradiating units 302 including the plurality of point light sources 302a, the luminance and chromaticity of the illumination light irradiated from the backlight 300 are partially set. Can be adjusted. Moreover, in this embodiment, as shown in FIG. 3, the irradiation part 302 is arrange | positioned at the grid | lattice form. Note that the arrangement of the irradiation unit 302 is not limited to a lattice shape. For example, an arrangement (a staggered or zigzag arrangement) in which the position of the irradiation unit 302 is shifted for each column may be used.

The point light source 302a is composed of, for example, a light emitting diode (LED). That is, one irradiation unit 302 is formed by a plurality of LEDs 302a. Incidentally, the illumination light generated from the backlight 300 may be preferably white light. In this embodiment, the irradiation unit 302 is formed by LEDs 302a of three colors of R (red), G (green), and B (blue), and the illumination light is converted into white light by mixing light generated from the LEDs 302a of RGB three colors. I have to. In addition, the method of making illumination light white light is not limited to the above-mentioned method. For example, the irradiation unit 302 may be formed from a white LED that emits white light.

The brightness of the illumination light is adjusted by controlling the power input to each LED 302a of the irradiation unit 302. That is, the illumination light becomes bright (the luminance is high) when the power input to the irradiation unit 302 is high, and the illumination light is dark (the luminance is low) when the power is low. The power input to the irradiation unit 302 may be controlled by, for example, a pulse width modulation method, a PWM method (pulse width modulation), or the like.

Note that the configuration of the display device 900 is not limited to the configuration including the four transparent substrates as described above, and the third transparent substrate and the light scattering property of the image display panel 100 as illustrated in FIG. The second transparent substrate of the liquid crystal display panel 200 may be configured as one common transparent substrate 15 in common. When the display device 900 is configured with such three transparent substrates, the pixel electrode 23 is formed on the front surface of the common transparent substrate 15, and the counter electrode 35 is formed on the rear surface of the common transparent substrate 15. It is formed. According to this configuration, it is possible to prevent a decrease in light transmittance due to the overlapping of a plurality of transparent substrates, and it is possible to reduce the thickness of the display device, which meets the recent demand for thinner liquid crystal display panels. can do.

The image display control unit 500 sets a light / dark image display area for displaying a light / dark image and a predetermined image display area for displaying a predetermined image, and displays them in the display area.

Next, FIG. 5 is an active matrix circuit configuration diagram of the light-scattering liquid crystal display panel 200. The light scattering liquid crystal display panel 200 includes a display region 90 in which a plurality of display pixels 80 are formed, a gate driver 110, and a source driver 120. In the display area 90, a plurality of scanning lines 22 and a plurality of signal lines 21 intersecting with the scanning lines 22 are arranged on the second transparent substrate 12 in a matrix shape via an insulating film (not shown). In addition, display pixels 80 are arranged at each intersection of the scanning lines 22. That is, in the display area 90, a plurality of display pixels 80 are arranged in a matrix. In this embodiment, the light-scattering liquid crystal display panel 200 has a generally rectangular shape as a whole, and the shape of the display region 90 is also generally rectangular. Here, the subscripts in parentheses are added to distinguish the scanning signal lines 22 from each other and to distinguish the data signal lines 21 from each other. The display pixel 80 includes a pixel electrode 23, a thin film transistor (TFT) 24, a counter electrode 25, and a memory liquid crystal layer 36. The source of the TFT 24 is connected to the signal line 21, the gate is connected to the scanning line 22, and the drain is connected to the pixel electrode 23.

The gate driver 110 includes a buffer circuit and a shift register (not shown), and sequentially outputs scanning signals to the scanning lines 22 based on control signals supplied from an external driving circuit (not shown). . For example, when displaying a moving image such as a clock display in the bright and dark image display area, the gate driver 110 sets the control signal line 30 to the off level and sequentially scans the scanning lines 22 as in the case of a normal active matrix liquid crystal display panel. Output the signal. On the other hand, when displaying still images such as various weather marks such as sunny, rainy, snow, etc., for example, in the bright and dark image display area, the scanning line 22 is turned off and the control signal line 30 is turned on. .

The source driver 120 includes an analog switch, a shift register, and the like, and a video signal is supplied from an external drive circuit (not shown) through a control signal and a video bus. The source driver 120 samples the video signal supplied from the video bus on the signal line 21 at a predetermined timing by supplying an analog switch open / close signal from the shift register.

The active matrix circuit configuration of the liquid crystal display panel 100 is formed in the same manner as the active matrix circuit configuration of the light scattering liquid crystal display panel 200 described above. In other words, the display area in which a plurality of display pixels are formed, a gate driver, and a source driver are included, and the gate driver and the source driver are arranged on the fourth transparent substrate 14 with signal lines, scanning lines, and pixels. It is formed integrally with the electrode 33. On the fourth transparent substrate 14, a plurality of scanning lines and a plurality of signal lines intersecting with the scanning lines are arranged in a matrix shape through an insulating film, and display pixels are arranged at the intersections of the signal lines and the scanning lines. Is arranged, and the display area is configured by including the display pixels. The display pixel includes a pixel electrode 33, a TFT, a counter electrode 35, and a liquid crystal layer 26. The TFT has a source connected to the signal line, a gate connected to the scanning line, and a drain connected to the pixel electrode.

Next, the manufacturing process of the display device 900 will be described. 6A to 6F are schematic views of the manufacturing process of the display device 900. FIG. As shown in FIG. 6A, an amorphous silicon thin film 71 is deposited on a glass substrate 41 by a plasma CVD method, and this amorphous silicon thin film 71 is annealed with a laser device to be polycrystallized. The laser beam 72 from the laser device is scanned in the direction of the arrow in the drawing, and the region irradiated with the laser beam 72 is crystallized to become a polycrystalline silicon film 73. Next, as shown in FIG. 6B, the polycrystalline silicon film 73 is patterned by, eg, photolithography to form an active layer 74 of the TFT. Next, as shown in FIG. 6C, a gate insulating film 75 made of a silicon oxide film is formed by, for example, a plasma CVD method, and then a gate electrode 76 is formed by patterning by forming, for example, a Mo—W alloy film by a sputtering method or the like. Form. Scan lines are also formed simultaneously during patterning. After the gate electrode 76 is formed, impurities are implanted by, for example, ion doping using the gate electrode 76 as a mask to form a source / drain region 78 of the TFT.

Next, as shown in FIG. 6D, a first interlayer insulating film 77 made of a silicon oxide film is formed on the gate electrode 76 by plasma CVD. Next, as shown in FIG. 6E, after forming contact holes in the first interlayer insulating film 77 and the gate insulating film 75, an aluminum film is formed by sputtering and patterned to form source / drain electrodes 79. At this time, a signal line is also formed. Next, as shown in FIG. 6F, a second interlayer insulating film 83 is formed on the aluminum film. Then, a contact hole is formed in the second interlayer insulating film 83, and a pixel electrode 23 is further formed.

Next, similarly to the steps shown in FIGS. 6A to 6F, gate electrodes, source / drain electrodes, scanning lines, and signal lines are formed on the front side, and a counter electrode 25 is formed on the back side by sputtering or the like. A first transparent substrate is prepared. The first transparent substrate 11 and the second transparent substrate 12 are opposed to each other, the periphery is sealed with a sealing material 29, the composition of the memory liquid crystal layer 36 is injected therein, and the light scattering liquid crystal is sealed therein. A display panel 200 is formed.

Next, in the same manner as in the method for manufacturing the light-scattering liquid crystal display panel 200 described above, the third transparent substrate 13 and the fourth transparent substrate 14 are opposed to each other, the periphery is sealed with a sealing material 39, and the liquid crystal layer is contained inside. The liquid crystal display panel 100 is formed by injecting and sealing 26 compositions.

Thereafter, the display device 900 is manufactured by arranging the second transparent substrate 12 of the light-scattering liquid crystal display panel 200 and the third transparent substrate 13 of the liquid crystal display panel 100 to face each other.

Thus, a display panel including the light-scattering liquid crystal display panel 200 and the image display panel 100 is manufactured during the manufacturing process of the display device 900. The display panel includes a plurality of display pixels 80 in the display area 90. The display area 90 on the display surface of the display panel is set to have a light / dark image display area for displaying a light / dark image composed of a combination of bright color display and dark color display, and a predetermined image display area for displaying a predetermined image. The display panel may be a display panel with a light receiving sensor 180 described later. The light receiving sensor 180 is arranged to receive external light irradiated on the display area 90 at a plurality of positions in the display area 90. The display panel with the light receiving sensor 180 can examine variations in luminance distribution generated in the display area 90 due to the influence of external light irradiated on the display area 90.

Next, usage examples of the display device 900 will be described. Here, an example of displaying digital signage content received via the Internet will be described. FIG. 7 is a block diagram of an image display system 910 as a digital signage system that includes a display device 900 and an external processing device 421 that generates an image signal for displaying an image and sends the image signal to the display device 900. As shown in FIG. 7, the image display system 910 is not limited to a digital signage device 410 in which the display device 900 according to the present invention is used as a display device, but is dedicated to, for example, the Internet 420 or the like. And an external processing device 421. The electronic signboard device 410 is a device that is installed at an entrance of a store or a company and displays contents such as advertisements and information for employees.

The communication circuit control unit 411 connects the electronic signboard device 410 to the external processing device 421 via the Internet 420. The provided content is automatically distributed from the external processing device 421, or a predetermined URL is input from the URL memory 414 by operating the electronic signage device 410, or manually input from the operation unit 415 to perform external processing. Connect to the device 421 to receive content. The received content data is temporarily stored in the received data memory 412. The browser memory 413 stores browser software that generates predetermined display screen contents from the received content. To display the content, the operation unit 415 is operated to select and read the necessary content from the reception data memory 412, and a display screen signal is generated from the content data and displayed on the display device 900.

FIG. 8 is a diagram showing a specific example in which a bright / dark image display area 710 and a predetermined image display area 720 are set and displayed in the display area 90. As shown in FIG. 8, the image display control unit 500 sets a bright and dark image display area 710 and a predetermined image display area 720 and displays them in the display area 90. A light / dark image 711 is displayed in the light / dark image display area 710, and the light / dark image 711 is not particularly limited, but is an image made up of letters, numbers, symbols, figures, or a combination thereof. Such as weather marks. A predetermined image 721 is displayed in the predetermined image display area 720, and the predetermined image 721 is not particularly limited, but is, for example, a news telop, a news video, or the like.

Next, the usage mode of the display device 900 will be described by exemplifying the case where the display device 900 is configured by the three transparent substrates shown in FIG. FIG. 9 is a cross-sectional view illustrating how the display device 900 is used.

As shown in FIG. 9, in the predetermined image display area 720, the image display control unit 500 applies a voltage between the pixel electrode 23 and the counter electrode 25, thereby aligning the liquid crystal molecules 38 in the memory liquid crystal layer 36. Thus, the memory liquid crystal layer 36 of the light-scattering liquid crystal display panel 200 is changed to a light transmission state. Then, the backlight control unit 501 turns on the irradiation unit 302 of the backlight 300 corresponding to the predetermined image display area 720. Thereby, for example, content distributed from the external processing device 421 to the liquid crystal display panel 100 of the display device 900 passes through the light scattering liquid crystal display panel 200 and is recognized by the observer.

On the other hand, in the bright / dark image display area 710, when displaying content distributed from, for example, the external processing device 421 on the light scattering liquid crystal display panel 200 of the display device 900, the light scattering liquid crystal display panel is displayed by the image display control unit 500. The liquid crystal molecules 38 in the memory liquid crystal layer 36 are set in a random state without forming an electric field between the pixel electrode 23 and the counter electrode 25 at a predetermined position 200, and the memory liquid crystal layer 36 of the light-scattering liquid crystal display panel 200 is light-scattered. By changing to a state and scattering external light, bright color display (for example, white display W) is performed at a predetermined location on the light-scattering liquid crystal display panel 200. In other parts of the light-scattering liquid crystal display panel 200, a voltage is applied between the pixel electrode 23 and the counter electrode 25 to align the liquid crystal molecules 38 in the memory liquid crystal layer 36. A dark color display (for example, black display B) is performed on the light scattering liquid crystal display panel 200 by changing the memory liquid crystal layer 36 to an aligned state and a light transmitting state. Further, the image display control unit 500 puts the liquid crystal layer 26 of the liquid crystal display panel 100 into a light non-transmissive state. The backlight control unit 501 turns off the irradiation unit 302 of the backlight 300 corresponding to the light and dark image display area 710. As a result, a light / dark image composed of a combination of the light color display and the dark color display is formed on the light scattering liquid crystal display panel 200.

Regarding the content display in the light and dark image display area 710, the driving of the active matrix TFT will be described below with reference to FIG. When the scanning signal is output from the gate driver 110 and each scanning line 22 is sequentially turned on, and the video signal is sampled on the signal line 21 in synchronization therewith, all the TFTs 24 connected to the scanning line 22 turned on are The video signal that has been sampled on the signal line 21 is written to the pixel electrode 23 through the TFT 24 during the period of one horizontal scanning. The video signal is charged as a signal voltage between the pixel electrode 23 and the counter electrode 25, and the memory liquid crystal layer 36 is in an oriented state or a random state depending on the presence or absence of the signal voltage, that is, the magnitude of the signal voltage. White display or black display for the display pixel 80 is controlled. By performing such an operation for all the scanning lines 22 within one frame period, a video of content is displayed.

As described above, according to the invention according to the present embodiment, as shown in FIG. 8, in the light / dark image display area 710, a light / dark image (for example, time display) composed of a combination of white display and black display is displayed as a light scattering liquid crystal. By displaying on the display panel 200, it is possible to display content while saving power consumption. In the predetermined image display area 720, for example, content distributed from the external processing device 421 can be displayed as a predetermined image (for example, news telop). For this reason, even in a power saving state, it is possible to display information that can be sufficiently used as an advertisement / identification medium.

<< Embodiment 2 >>
Next, in the second embodiment, a predetermined image display area and a light / dark image display area are set according to the intensity of the external light applied to the display area.

FIG. 10 is a block diagram schematically illustrating the structure of the display device 900 according to the second embodiment. In FIG. 10, for convenience of explanation, the liquid crystal display panel 100 is omitted, and the light scattering liquid crystal display panel 200 and the backlight 300 are exaggerated and separated. The light-scattering liquid crystal display panel 200 has a display area 90 that is an area for displaying an image, and a frame-shaped non-display area provided around the display area 90.

The light receiving sensor 180 is for receiving external light irradiated on the display area 90, and is arranged in a distributed manner in the display area 90, for example. For this reason, the light receiving sensor 180 can obtain light reception information of the external light that irradiates the display region 90 at various sites in the display region 90.

The light receiving sensor 180 is disposed in a region where each of the plurality of display pixels 80 is formed in a plan view of the light scattering liquid crystal display panel 200. For this reason, the light reception information a1 to d1 of the external light that irradiates the display region 90 can be obtained for each display pixel 80 unit. The arrangement of the light receiving sensor 180 is not limited to this. For example, the light receiving sensor 180 is provided for each pixel group (8 pixel × 8 pixel group, 10 pixel × 10 pixel group) composed of a plurality of display pixels. May be provided. In this case, the light reception information a1 to d1 can be obtained for each pixel group. In addition, the pixel group can be set arbitrarily.

The light receiving sensor 180 may be a sensor that generates electrical information according to the received light. For example, the light receiving sensor 180 may be a sensor that generates a photovoltaic force by the received external light. As such a light receiving sensor 180, for example, a photodiode, a phototransistor, or the like can be used. The light receiving sensor 180 may be a photoresistor whose electric resistance changes according to the intensity of received light. The specific information of the “light reception information” varies depending on the type of sensor, circuit configuration, and the like. In this embodiment, a photodiode is used as the light receiving sensor 180.

Next, FIG. 11 is a detailed sectional view of the light-scattering liquid crystal display panel 200 for explaining the arrangement position of the light receiving sensor 180. As shown in FIG. 11, a spacer 16 is interposed between the second transparent substrate 12 and the first transparent substrate 11. The interval between the second transparent substrate 12 and the first transparent substrate 11 is maintained at a predetermined interval by the spacer 16.

The second transparent substrate 12 includes a pixel electrode 23, a signal line 21, a scanning line 22, a control signal line 30, a planarization layer 44, which are formed on the front side of the glass substrate 41 (that is, the memory liquid crystal layer 36 side). An alignment film 46, a TFT 24, and the like are provided.

In the first transparent substrate 11, a black matrix 62, a color filter layer 63, a planarizing layer 64, a counter electrode 25, and an alignment film 66 (horizontal alignment film) are formed on the glass substrate 61 on the memory liquid crystal layer 36 side.

The black matrix 62 is formed of a material that does not transmit light (for example, a metal such as Cr (chromium)), and is provided between the color filter layers 63 so as to partition each display pixel 80. The color filter layer 63 is a filter that adjusts the color tone. The color filter layer 63 adjusts the color tone of the transmitted light by absorbing light having a wavelength corresponding to a color other than the color of the color filter layer 63. In this embodiment, three color filter layers 63 of red (R), green (G), and blue (B) are sequentially arranged for one display pixel 80.

The planarization layer 64 is formed so as to cover the black matrix 62 and the color filter layer 63. A counter electrode 25 is formed so as to cover the planarizing layer 64. Further, an alignment film 66 is formed so as to cover the counter electrode 25. The alignment film 66 faces the alignment film 46 of the second transparent substrate 12. The

alignment films

46 and 66 of both the

substrates

11 and 12 define the alignment direction of the liquid crystal molecules when no voltage is applied. In this embodiment, the alignment film 66 and the alignment film 46 differ in the alignment direction by 90 °.

Regarding the liquid crystal display panel 100 as well, the light scattering liquid crystal display panel 200 described above is basically the same except that the liquid crystal layer 26 is taught between the third transparent substrate 13 and the fourth transparent substrate 14. It is the same structure as. Here, the case where the display device 900 is configured with the three transparent substrates shown in FIG. 4 will be described as an example, and the liquid crystal display panel 100 side will be described. As shown in FIG. The color filter layer is not formed in. This is because if the color filter layer is also formed inside the back surface of the common transparent substrate 15, the light transmittance is deteriorated and the transparency is lowered.

In addition to the embodiment shown in FIG. 12, a black matrix is provided inside the common transparent substrate 15 so as to partition each pixel, and R (red), G (green), and B (blue) are provided between the black matrices. ) Can also be formed. In such a case, a color filter is not formed inside the fourth transparent substrate 14 in order to prevent the light transmittance from being lowered.

In the case where the display device 900 is configured with the four transparent substrates shown in FIG. 2, the color filter layer is formed inside the first transparent substrate, and the color filter layer is formed inside the back surface of the third transparent substrate 13. Not formed. It is also possible to form the color filter layer inside the front surface of the second transparent substrate and not form the color filter layer inside the front surface of the fourth transparent substrate 14.

Next, FIG. 13 is a block diagram schematically showing a wiring structure and a control unit of the display device 900 according to the present embodiment. The light receiving sensor 180 is connected to the control unit 550. Then, the photovoltaic power generated by the optical sensor 180 is sent to the control unit 550 as “light reception information a1 to d1”. The control unit 550 is connected to the liquid crystal display panel 100, the light scattering liquid crystal display panel 200, and the backlight 300. The control unit 550 receives signals from the light receiving sensor 180 and the external processing device 421.

Furthermore, as shown in FIG. 14, each display pixel 80 is formed with a TFT 24, a liquid crystal capacitor Clc, and an auxiliary capacitor Ccs. The gate electrode 76 of the TFT 24 is connected to the scanning line 22. A source electrode 81 of the TFT 24 is connected to the signal line 21.

The auxiliary capacitor Ccs has a first electrode 91 and a second electrode 92. The first electrode 91 is connected to the control signal line 30, while the second electrode 92 is connected to the drain electrode 93 of the TFT 24. The auxiliary capacitor Ccs receives a control signal from the control signal line 30 and maintains the voltage (liquid crystal capacitor Clc) applied to the display pixel 80. Further, the liquid crystal capacitor Clc has a pixel electrode 23 and a counter electrode 25. The pixel electrode 23 is connected to the drain electrode 93 of the TFT 24.

Returning to FIG. 13, the external processing device 421 includes, for example, a plurality of personal computers (PCs) operated by an administrator of the display device 900 and the like, and has image information 422 and priority information 423 for each displayed image. ing. The external processing device 421 may be configured by a network having a plurality of personal computers in addition to a plurality of personal computers.

The image information 422 is information of the image itself displayed on the display device 900, and the priority information 423 is information indicating the priority of each display image. The external processing device 421 supplies a digital signal 424 including the image information 422 and priority information 423 to the control unit 550.

The control unit 550 is an electronic processing device, and includes a liquid crystal panel control unit 520, a backlight control unit 501, a signal input unit 521, a power source 522, and an image display control unit 500 connected thereto. ing.

The control unit 550 is configured to control the liquid crystal display panel 100, the light-scattering liquid crystal display panel 200, and the backlight 300 based on signals input from the light receiving sensor 180 and the external processing device 421. A digital signal 424 is input from the external processing device 421 to the signal input unit 521, and the signal input unit 521 outputs the input digital signal 424 to the image display control unit 500.

In the image display control unit 500, reference values are predetermined for the light reception information a1 to d1 obtained by the light reception sensor 180. When the light reception information a1 to d1 exceeding the reference value is obtained by the light reception sensor 180, the image display control unit 500 sets the light / dark image display area and the predetermined image display area based on the light reception information a1 to d1. Are displayed in the display area 90.

When the display area 90 is irradiated with strong external light that exceeds a predetermined reference value, the display device 900 sets a bright and dark image display area in the area irradiated with the strong external light. In addition, since the predetermined image display area is set in other areas, the display information can be appropriately transmitted to the observer.

Here, FIG. 15 is a block diagram showing a configuration of the image display control unit 500. As shown in FIG. 15, the image display control unit 500 includes a reference value setting unit 531, an image output setting unit 532, a signal analysis unit 533, and an image output control unit 534.

The reference value setting unit 531 has a function of setting a reference value for the light reception information a 1 to d 1 input from the light receiving sensor 180 and outputting the reference value to the image output setting unit 532. The image output setting unit 532 sets a bright and dark image display area and a predetermined image display area in the display area 90 based on the reference value and the light reception information a1 to d1 input from the light receiving sensor 180, and displays the display area 90. It has a function to display.

The image output setting unit 532 outputs control signals related to the set bright / dark image display area and the predetermined image display area to the image output control unit 534 or the backlight control unit 501, respectively.

The signal analysis unit 533 analyzes the image information and priority information included in the digital signal received by the signal input unit 521 and outputs the image information and the priority information to the image output control unit 534. The image output control unit 534 has a control function of changing the size of the light / dark image according to the light / dark image display area set by the image output setting unit 532. Further, the image output control unit 534 has a control function of changing the size of the predetermined image in accordance with the predetermined image display area set by the image output setting unit 532. Then, the image output control unit 534 outputs the controlled image signal to the liquid crystal panel control unit 520.

The liquid crystal panel control unit 520 is connected to the power source 522 and controls the light scattering liquid crystal display panel 200 based on the image signal supplied from the image display control unit 500 to adjust the light transmittance of the memory liquid crystal layer 36. To do.

More specifically, the scanning lines 22 (1) to (m) of the light scattering liquid crystal display panel 200 are connected to the gate driver 110, and the signal lines 21 (1) to (n) are connected to the source driver 120. Has been. Further, the gate driver 110 and the source driver 120 are each connected to the liquid crystal panel control unit 520.

The liquid crystal panel control unit 520 includes a timing controller 525 and supplies a liquid crystal panel control signal created based on the image signal to the gate driver 110 and the source driver 120. At this time, the timing controller 525 adjusts the timing for transmitting the liquid crystal panel control signal to the gate driver 110 and the source driver 120. Thus, based on the image signal, a light and dark image is displayed in the light and dark image display area, and a predetermined image is displayed in the predetermined image display area.

The power source 522 supplies operating power to each component of the display device 900. Further, as shown in FIG. 13, the power source 522 supplies the common electrode voltage (Vcom) to the counter electrode 25 of the first transparent substrate 11 in addition to the operation power source. The common electrode voltage (Vcom) supplied to the counter electrode 25 is used as a voltage for applying the memory liquid crystal layer 36 sandwiched between the second transparent substrate 12 and the first transparent substrate 11.

The backlight control unit 501 controls the plurality of irradiation units 302 for each of the plurality of areas A to D obtained by dividing the display area 90 based on the light reception information a1 to d1 obtained by the light reception sensor 180, thereby controlling the illumination light. It has a function of adjusting brightness (luminance).

That is, the backlight control unit 501 creates the backlight control signals a2 to d2 based on the control signal supplied from the image output setting unit 532. Electric power controlled based on the backlight control signals a2 to d2 is input to the irradiation unit 302 of the backlight 300. As a result, the illumination light emitted from the backlight 300 is adjusted. The backlight control unit 501 is configured to increase the luminance of illumination light in a region including a predetermined image display area among the plurality of regions (A to D). In this way, the control unit 550 displays a desired image in the display area 90.

When the digital signal 424 is input to the signal input unit 521 of the control unit 550, the signal input unit 521 outputs the input digital signal 424 to the signal analysis unit 533 of the image display control unit 500. The signal analysis unit 533 outputs a signal obtained by analyzing the image information and priority information included in the digital signal 424 to the image output control unit 534.

FIG. 16 is a flowchart showing a method for controlling the display device 900. In step S101 of FIG. 16, light reception information a1 to d1 of light incident on the display area 90 is acquired by the plurality of light reception sensors 180 (first step). The light receiving sensor 180 receives, as external light, ambient light where the display device 900 is installed, and also receives sunlight directly irradiated on the display area 90. When the sunlight L stronger than the ambient light is directly applied to the display area 90, it becomes difficult for the observer to visually recognize the image in the irradiation area of the sunlight L.

The light reception information a1 to d1 acquired by the light reception sensor 180 is output to the reference value setting unit 531 and the image output setting unit 532 as shown in FIG. The reference value setting unit 531 sets a reference value based on the light reception information a 1 to d 1 and outputs the reference value to the image output setting unit 532. For example, the reference value can be set as a value that is larger by a predetermined value than the received light information a1 to d1 of the display area 90 irradiated with ambient light.

Next, in step S102 of FIG. 16, the image output setting unit 532 determines whether the area of the part where the received light information a1 to d1 exceeding the reference value has exceeded a certain ratio with respect to the area of the display region 90. Determine whether.

Here, FIG. 17 is a plan view showing a display device 900 in which sunlight L as external light is directly irradiated on the display region 90. FIG. For example, as shown in FIG. 8, when the sunlight L is not directly irradiated to the display area 90, the area of the part where the received light information a1 to d1 exceeding the reference value is obtained in step S102 is the fixed area. Since the ratio is below, the process does not proceed to step S103. In this case, as shown in FIG. 8, when the sunlight L as the external light is not directly applied to the display area 90, for example, a bright and dark image display area 710 is displayed below the display area 90, An image display area 720 is displayed on the display area 90, and each is displayed with an equal area.

On the other hand, when the sunlight L is directly irradiated on a part of the display region 90 in step S102 and the area of the part where the received light information a1 to d1 exceeding the reference value is obtained exceeds the certain ratio, the step The process proceeds to S103.

In step S103, the image output setting unit 532 sets the light / dark image display area 710 and the predetermined image display area 720 based on the light reception information a1 to d1. As shown in FIG. 17, the predetermined image display area 720 is a part of the display area 90 that has received light reception information that exceeds the reference value (that is, the direct irradiation area in which the sunlight L is directly irradiated in the display area 90. ) (That is, a relatively dark area other than the direct irradiation area in the display area 90), and set to have as large an area as possible. For example, when the predetermined image 721 is a news telop, it is possible to perform one-step display with large characters that are easily recognized by an observer.

Subsequently, the image output setting unit 532 sets a light and dark image display area 710 in an area other than the predetermined image display area 720 in the display area 90 as shown in FIG. The bright / dark image display area 710 is set as large as possible within a range that does not overlap the predetermined image display area 720. At this time, the image output setting unit 532 detects the coordinate information of the predetermined image display area 720 by image analysis, and sets the light and dark image display area 710 in an area other than the predetermined image display area 720 (that is, an empty area). . The bright and dark image display area 710 in the present embodiment is arranged over a region where the sunlight L is irradiated from a region excluding a portion of the display region 90 where light reception information exceeding the reference value is obtained. That is, the main area of the light / dark image display area 710 is set in an area where light reception information exceeding the reference value is obtained.

As the image analysis method, for example, an image of a predetermined color or a predetermined pattern is formed in a background area other than the predetermined image display area 720 in the display area 90, and the predetermined image is detected by detecting the predetermined color or the predetermined pattern. Coordinates indicating the range of the display area 720 can be obtained.

In this way, it is possible to prevent the visibility of the predetermined image from being lowered by preventing the light and dark image from overlapping the predetermined image. Since the predetermined image display area 720 is provided in a relatively dark area that is not irradiated with external light and the predetermined image 721 is displayed there, it is difficult for the predetermined image 721 to be difficult to see due to external light. Further, since a light / dark image display area 710 is provided in the area irradiated with external light and the light / dark image 711 is displayed there, the light scattering liquid crystal layer in the light scattering state is irradiated with external light to clear the bright color display. The bright and dark image 711 can be displayed with good contrast. In addition, the brightness of the irradiation unit 302 in the predetermined image display area 720 and the light / dark image display area 710 is controlled independently of each other so that the predetermined image in the predetermined image display area 720 and the light / dark image in the light / dark image display area 710 are appropriately Display with high brightness, and the visibility of the observer can be further enhanced.

When the total number of the predetermined image and the light / dark image is a plurality of three or more, the image output setting unit 532 displays the single or plural predetermined images in the predetermined image display area 720 and the single or plural images in the light / dark image display area 710. Displays the light and dark images. At this time, the area of each of the plurality of light and dark images can be reduced as the priority of the light and dark images displayed in the light and dark image display area 710 decreases. In addition, the area of each of the plurality of predetermined images can be reduced as the priority of the predetermined image displayed in the predetermined image display area 720 decreases.

Next, in step S104 of FIG. 16, the image output control unit 534 changes the size of the predetermined image according to the size of the predetermined image display area 720. That is, the image output control unit 534 arranges the predetermined image as large as possible in the predetermined image display area 720 set in a relatively dark area other than the direct irradiation area in the display area 90 as shown in FIG. As described above, the predetermined image is enlarged or reduced. Further, the image output control unit 534 changes the size of the light / dark image according to the size of the light / dark image display area 710. That is, for example, as illustrated in FIG. 17, the image output control unit 534 enlarges or reduces the light / dark image so that the light / dark image is arranged as large as possible in the light / dark image display area 710 in the display area 90. Then, the image output control unit 534 outputs the image signal 424 to the liquid crystal panel control unit 520.

The liquid crystal panel control unit 520 supplies a liquid crystal panel control signal created based on the image signal 424 to the gate driver 110 and the source driver 120. As a result, the predetermined image and the light and dark image respectively enlarged or reduced by the image output control unit 534 are combined and displayed on the display area 90.

In step S105 in FIG. 16, the backlight control unit 501 controls the irradiation unit 302 of the backlight 300 in the areas A to D including the predetermined image display area 720 based on the control signal received from the image output setting unit 532. And the luminance of the irradiation unit 302 is increased. This makes it easier to visually recognize the predetermined image.

The image output setting unit 532 is configured to display the predetermined image display area so that the total moving distance of these images is minimized, particularly when the total number of the predetermined images and the light and dark images is three or more. It is preferable to set 720 and a bright and dark image display area 710. In this way, the observer can easily recognize each image after movement.

Further, display control of a predetermined image or the like may be performed based on the light reception information acquired by the light reception sensor 180 disposed in the center portion of the display area 90.

In this case, the reference value setting unit 531 of the image display control unit 500 sets a reference value based on the light receiving information acquired by the light receiving sensor 180 disposed in the central portion of the display area 90, and outputs the reference value as an image. Output to the setting unit 532. The image output setting unit 532 sets a predetermined image display area 720 based on the light reception information when the light reception information exceeds a reference value. Then, the predetermined image is displayed in the predetermined image display area 720 by the liquid crystal panel control unit 520 in the same manner as the above-described control. In this way, the stress due to the poor visual recognition of the observer can be reduced by the small number of light receiving sensors 180 arranged in the central portion of the display area 90.

In addition, the image display control unit 500 receives light reception information a1 to d1 obtained by a light reception sensor 180 serving as a predetermined reference among the plurality of light reception sensors 180, and light reception information a1 to d1 obtained by other light reception sensors 180. It is preferable to obtain a difference from d1 and control display of a predetermined image or the like based on the difference between the received light information a1 to d1.

In this case, the reference light receiving sensor 180 may be set in the backlight control unit 501 in advance. Further, how to control the display of a predetermined image or the like with respect to the difference between the light reception information a1 to d1 obtained by the reference light reception sensor 180 and the light reception information a1 to d1 obtained by the other light reception sensors 180 is controlled. This may be preset in the image display control unit 500. In this case, the image display control unit 500 can appropriately control the display of the predetermined image 721 and the like by accurately reflecting the intensity distribution of the external light in the display area 90.

Further, the image display control unit 500 obtains the difference between the light reception information a1 to d1 obtained by the same light reception sensor 180 at a plurality of predetermined timings, and determines a predetermined image based on the difference between the light reception information a1 to d1. Etc. may be controlled respectively. Thus, the image display control unit 500 can accurately control the display of a predetermined image or the like by accurately reflecting the amount of change over time of the light reception information a1 to d1 obtained by the light reception sensor 180.

In addition, when external light that irradiates the display area 90 is temporarily interrupted by a person passing in front of the display device 900, the light reception information a1 to d1 obtained by the light receiving sensor 180 temporarily changes greatly. If display of a predetermined image or the like is controlled based on the light reception information a1 to d1 obtained at this time, the arrangement and size of each image change unnecessarily.

In order to prevent such a failure, the image display control unit 500 continues the predetermined light reception information a1 to d1 when the constant light reception information a1 to d1 is obtained by the light reception sensor 180 for a predetermined time. Based on this, display of a predetermined image or the like is controlled.

<< Embodiment 3 >>
In the above-described second embodiment, the predetermined image display area 720 is set to an area excluding the part of the display area 90 where the received light information exceeding the reference value is obtained, and the main area of the light / dark image display area 710 is the above-described area. It was set in an area where received light information exceeding the reference value was obtained. However, the scope of the present invention is not limited to such an embodiment. In the following, a modified example of the bright / dark image display area 710, the predetermined image display area 720 and the display mode in the display area 90 will be described. 18 to 22 are diagrams for explaining modifications of the display modes of the light and dark image display area 710 and the predetermined image display area 720, respectively.

First, in FIG. 18, the light / dark image display area 710 is set to an area in which light reception information whose main area exceeds the reference value is obtained. Therefore, the central portion 712 of the bright / dark image display area 710 slightly protrudes from the region where the received light information exceeding the reference value is obtained. The predetermined image display area 720 is set so that at least a central portion 722 of the predetermined image display area 720 is located in an area excluding a portion where light reception information exceeding the reference value is obtained. According to this display mode, since the observer tends to recognize the central portion of the image with priority, the central portion 722 of the predetermined image display area 720 is excluded from the portion where the received light information exceeding the reference value is obtained. By locating in the region, it is possible for the observer to recognize the predetermined image 721 without a sense of incongruity.

Next, in FIG. 19, the predetermined image display area 720 is set to an area excluding a part where the main area has received light reception information exceeding the reference value. For this reason, the central portion 722 of the predetermined image display area 720 slightly protrudes from the region excluding the portion where the received light information exceeding the reference value is obtained. The bright / dark image display area 710 is set so that at least the central portion 712 is located in a region where the received light information exceeding the reference value is obtained. According to this display mode, since the main area of the predetermined image display area 720 is set to an area excluding a part where light reception information exceeding the reference value is obtained, the predetermined image display area 720 is set to be relatively large. Therefore, unlike the first embodiment, when the predetermined image 721 is a news telop, it is possible to perform two-stage display.

Next, in FIG. 20, the predetermined image display area 720 is set to an area excluding the part where the main area has received light reception information exceeding the reference value. The bright / dark image display area 710 is set in an area where light reception information exceeding the reference value is obtained. According to this display mode, since all the light and dark images 711 are within the region where the received light information exceeding the reference value is obtained, the observer can accurately recognize the light and dark images 711.

Next, in FIG. 21, the light and dark image display area 710 is set to an area where light reception information exceeding the reference value is obtained. The predetermined image display area 720 is set in an area excluding a part where light reception information exceeding the reference value is obtained. Therefore, according to this display mode, it is possible to cause the observer to recognize both the bright and dark image 711 and the predetermined image 721 accurately. On the other hand, in the display area 90, for example, a third area 730 is set in addition to the predetermined image display area 720 and the bright and dark image display area 710. The third area 730 is an area provided in a region other than the predetermined image display area 720 and the bright / dark image display area 710 and performs display or non-display. By providing the third area 730, the third area 730 is displayed in the display region 90. Display variations can be increased. When display is performed in the third area 730, the display mode is not particularly limited. For example, the memory liquid crystal layer 36 of the light-scattering liquid crystal display panel 200 is set in a light-transmitting state, and light is transmitted through the liquid crystal display panel 100. It is also possible to display the flashing electrical decoration to draw the viewer's attention. Further, when no image is displayed in the third area 730, it is possible to save power by the proportion of the third area 730 in the display area 90.

The shape of the third area 730 is not particularly limited. For example, the shape of the third area 730 is larger than the shape shown in FIG. 21 as shown in FIG. 22 as well as the shape shown in FIG. It is also possible to set. For example, when the third area 730 is not displayed, power saving can be promoted by setting the area of the third area 730 large.

<< Embodiment 4 >>
FIG. 23 is a plan view showing a display device 900 in which sunlight L as external light is directly applied to the display area 90. In the second and third embodiments, external light is applied to the predetermined image display area 720 that displays the enlarged or reduced predetermined image 721 and the light / dark image display area 710 that displays the enlarged or reduced light / dark image 711. In the present embodiment, the predetermined image display area 720 and the bright / dark image display area 710 are simply switched up and down (or left and right) for display.

That is, the image display control unit 500 according to the present embodiment, when the display region 90 is divided into two upper and lower regions having the same area, the light reception information a1 that exceeds the reference value by the light receiving sensor 180 in the two regions. The predetermined image display area 720 is set in one area where the area of the region where d1 is obtained is small, and the light and dark image display area 710 is set in the other area.

When controlling the display device 900 in the present embodiment, steps S101 and S102 in FIG. 12 are performed as in the first embodiment. Subsequently, in step S103, the image output setting unit 532 determines, based on the obtained light reception information a1 to d1, that the area of the portion directly irradiated with sunlight L is larger in the two left and right regions. When the predetermined image display area 720 is arranged, the arrangement of the two upper and lower areas is switched, and the arrangement of the predetermined image display area 720 and the light and dark image display area 710 is changed together with the upper and lower two areas. .

On the other hand, the image output setting unit 532 determines the predetermined image display area 720 based on the obtained light reception information a1 to d1 so that the area of the portion directly irradiated with the sunlight L is smaller in the two left and right regions. Are arranged without changing the arrangement of the display areas.

In this embodiment, step 104 in FIG. 16 is not performed, and the predetermined image 721 or the light / dark image 711 is displayed in the display area as it is. Similarly to step S <b> 105 of FIG. 16, the backlight control unit 501 performs backlighting in any of the upper and lower areas of the display area 90 including the predetermined image display area 720 based on the control signal received from the image output setting unit 532. The irradiation unit 302 of the light 300 is controlled, and the luminance of the irradiation unit 302 is increased. As a result, the predetermined image 721 can be more visually recognized.

Even in the case where the total number of the predetermined images 721 and the light and dark images 711 is a plurality of three or more, the predetermined image display area is smaller in the area where the sunlight L is directly irradiated as described above. The upper and lower two areas in the display area 90 may be appropriately switched so that 720 is displayed.

Therefore, according to the present embodiment, when the display area 90 is irradiated with external light exceeding the reference value, the arrangement of the predetermined image display area 720 and the light / dark image display area 710 is appropriately changed upside down by the image display control unit 500. Since the setting is made, the control by the image display control unit 500 can be simplified and the image display can be performed. In the present embodiment, the arrangement of the predetermined image display area 720 and the light / dark image display area 710 is set upside down, but the position change mode of the change is not particularly limited, and for example, not only the upside down but also the left and right Even in the replacement, it is possible to simplify the control by the image display control unit 500 and perform appropriate image display.

<< Embodiment 5 >>
FIG. 24 is a plan view showing a display device 900 of Embodiment 5 in which sunlight L as external light having higher intensity than those of Embodiments 2 to 4 described above is directly applied to the display area 90. FIG. In the fifth embodiment, both the bright and dark image display area 710 and the predetermined image display area 720 are set in a relatively dark area other than the direct irradiation area of high intensity external light. That is, in the above-described second embodiment, the bright and dark image display area 710 is set in the direct irradiation area of external light, and the predetermined image display area 720 is set in the relatively dark area. However, high intensity external light is displayed in the display area. If the light / dark image display area 710 is set in the external light direct irradiation region, the light / dark image 711 may be difficult to see. Therefore, when the sunlight L as the external light having a high intensity is directly irradiated on the display area 90, both the dark image display area 710 and the predetermined image display area 720 are other than the direct irradiation area of the external light having a high intensity. Set to a relatively dark area.

An altitude reference value higher than the reference value of the second embodiment is determined in advance for the light reception information obtained by the light receiving sensor 180. Then, the image display control unit 500 according to the present embodiment selects a portion of the display area 90 where the light reception information a1 to d1 exceeding the altitude reference value is obtained based on the light reception information a1 to d1 obtained by the light reception sensor 180. Both the predetermined image display area 720 and the light / dark image display area 710 are set in the relatively dark area except for the above.

Here, the image display control unit 500 can set the predetermined image display area 720 to be larger than the light and dark image display area 710 based on, for example, the priority or display content of an image to be described later, It is also possible to set the predetermined image display area 720 smaller than the light and dark image display area 710.

When controlling the display device 900 in the present embodiment, steps S101 and S102 in FIG. 16 are performed as in the second embodiment. Subsequently, in step S103, the image output setting unit 532 sets a predetermined image display area 720 and a light / dark image display area 710 based on the obtained light reception information a1 to d1.

At this time, the image output setting unit 532 arranges, for example, the predetermined image display area 720 relatively large in an area where the sunlight L is not directly irradiated, and the coordinate information of the predetermined image display area 720 is obtained by image analysis. For example, a bright and dark image display area 710 is set in an area other than the predetermined image display area 720 (that is, an empty area) in the area that is not irradiated with the sunlight L. Then, the predetermined image 721 and the bright / dark image 711 are enlarged or reduced by the image output control unit 534, respectively, and displayed in an area where the sunlight L is not directly irradiated.

When the total number of the predetermined images 721 and the light and dark images 711 is a plurality of three or more, the image output setting unit 532 includes a plurality of image output areas in areas other than the predetermined image display area 720 in the area where the sunlight L is not irradiated. The bright and dark image display area 710 is set.

Therefore, according to the present embodiment, when the display area 90 is irradiated with strong external light that exceeds the reference value, the image display control unit 500 converts both the predetermined image 721 and the light / dark image 711 into sunlight L. Is displayed in a relatively dark area that is not directly irradiated, so even if such strong external light is irradiated on the display area 90, information by the predetermined image 721 and information by the light and dark image 711 Can be suitably transmitted to the observer.

Embodiment 6
In the above-described fifth embodiment, when the sunlight L as external light having high intensity is directly applied to the display area 90, both the dark image display area 710 and the predetermined image display area 720 have high external light. A relatively dark area other than the direct irradiation area was set. However, the scope of the present invention is not limited to such an embodiment.

For example, when high intensity external light is irradiated over a wide range of the display area 90 and the area of the portion is large, both the dark image display area 710 and the predetermined image display area 720 have high intensity. Even if a relatively dark area other than the direct irradiation area of the external light is set, the sizes of the dark image 711 and the predetermined image 721 are small. Accordingly, in the sixth embodiment, when the display area 90 is directly irradiated with sunlight L as external light having high intensity, and the area exceeds a certain ratio with respect to the area of the display area 90, the display area The display of an image at 90 is temporarily stopped. As a result, it is possible to save power consumption for driving the display device by not displaying an image whose advertisement / identification function is not sufficient by displaying it in a small size, and by showing a small and hard-to-see image to the observer The occurrence of stress on the observer can be prevented.

In this case, the image display control unit 500 may be connected to the power source 522, for example. Then, when the area of the part where the received light information 1a to 1d exceeding the altitude reference value exceeds a certain ratio with respect to the area of the display region 90, the image display control unit 500 generates an operation stop signal. . When an operation stop signal is sent from the image display control unit 500, the power source 522 stops supplying power to the liquid crystal panel control unit 520, the backlight control unit 501, and the like. As a result, the image display control unit 500 causes the display region 90 to be displayed when the area of the part where the received light information 1a to 1d exceeding the altitude reference value exceeds a certain ratio with respect to the area of the display region 90. The display of the image can be stopped.

As another form, the image display control unit 500 displays the light receiving information 1a to 1d of external light having an intensity exceeding a predetermined altitude reference value at the center of the screen in the display area 90. It is also possible to temporarily stop displaying an image in the area 90. Since the central portion of the display area 90 is easy to enter the observer's field of view, if the central portion of the display area 90 is difficult to see, it is difficult to grasp the contents of the entire display image. Therefore, the image display control unit 500 can stop displaying an image on the display area 90 when it becomes difficult to see the center of the display area 90. Thus, by displaying an image that is difficult to see, it is possible to eliminate stress on the observer and to save power for driving the display device.

<< Embodiment 7 >>
FIGS. 25 to 32 are block diagrams of display devices that schematically show modifications of the arrangement of the light receiving sensors. The light receiving sensor 180 may be arranged so that external light irradiated on the light-scattering liquid crystal display panel 200 can be received at a plurality of positions in the display region 90. Hereinafter, the arrangement position of the light receiving sensor 180 will be exemplified.

The light receiving sensors 180 may be arranged in a distributed manner, for example, along a line set so as to traverse or longitudinally cross the display area 90. Thereby, the light reception information of the external light irradiated on the display area 90 can be acquired along a line set so as to traverse or cross the display area 90. In this case, for example, the brightness of the external light can be detected along a line set so as to cross or vertically cross the display area 90. In this case, the number of light receiving sensors 180 can be reduced as compared with the case where the light receiving sensors 180 are arranged for each pixel group composed of a plurality of pixels.

This makes it possible to simplify the circuit and wiring for acquiring external light reception information and to keep the manufacturing cost low. In addition, although the aperture ratio decreases in the display pixel 80 in which the light receiving sensor 180 is disposed, the aperture ratio of the display pixel 80 is reduced as a whole in the display area 90 by reducing the number of the light receiving sensors 180 in this way. Since it can suppress, the luminance fall of a display image can be suppressed.

For example, when the display area 90 is rectangular, the light receiving sensor 180 displays along the line connecting the midpoints of at least two opposite sides of the four sides of the display area 90 as shown in FIGS. You may arrange | position to the area | region 90. In this case, the light receiving sensor 180 can obtain the light receiving information a1 to d1 of the external light that irradiates the display area 90 along the line connecting the intermediate points.

Further, as shown in FIG. 25, the light receiving sensor 180 may be arranged along a line connecting the midpoints of the two sides in the short direction of the rectangular display area 90. In this case, since the light reception information a1 to d1 of the external light in the longitudinal direction of the rectangular display area 90 can be obtained, the light reception information a1 to d1 roughly reflecting the luminance distribution of the external light that irradiates the entire display area 90 is obtained. Obtainable.

When it is desired to accurately obtain the light reception information a1 to d1 of the external light in the short direction of the display area 90, as shown in FIG. 26, the line connecting the midpoints of the two sides in the short direction of the display area 90 The light receiving sensor 180 may be disposed along the line connecting the midpoints of the two sides in the longitudinal direction of the display region 90.

27 and 28, the light receiving sensor 180 may be arranged along at least two opposite sides of the four sides of the display region 90 in the peripheral portion of the display region 90.

Here, when the light receiving sensor 180 is arranged at the center of the display area 90 and the brightness of the display image is lowered at the center of the display area 90, the brightness of the display image is easily recognized by the user. On the other hand, as described above, disposing the light receiving sensor 180 at the peripheral portion of the display area 90 reduces the brightness of the display image compared to the case where the light receiving sensor 180 is disposed at the center of the display area 90. It becomes difficult to be recognized.

It should be noted that the light receiving sensor 180 can be disposed at another position in the plan view of the light scattering liquid crystal display panel 200. For example, as shown in FIG. 29, the light receiving sensor 180 may be arranged along at least one diagonal line of the display region 90. Further, as shown in FIG. 30, the light receiving sensor 180 may be disposed at the center of each side in the peripheral portion of the display area 90. Further, the light receiving sensors 180 may be arranged at the four corners of the peripheral portion of the display area 90 as shown in FIG.

In the above-described embodiment, the display area 90 is set with areas divided into four areas A, B, C, and D. However, the number of divisions of the display area 90 is not limited to four and can be changed as appropriate according to the application. For example, as shown in FIG. 32, a plurality of areas A to Z obtained by dividing the display area 90 may be set corresponding to the position where the light receiving sensor 180 is disposed. In this case, it is preferable that the irradiation unit 302 is arranged corresponding to the position of each of the areas A to Z (each light receiving sensor 180), and each of the irradiation units 302 is controlled. In this case, the backlight control unit 501 can control the irradiation unit 302 for each of the areas A to Z set for each irradiation unit 302 based on the light reception information a1 to z1 obtained by the light receiving sensor 180. .

The display pixel 80 is provided with an opening for transmitting illumination light irradiated from the backlight 300 to the light-scattering liquid crystal display panel 200 and the liquid crystal display panel 100 and external light irradiating the display region 90. In this case, the black matrix 62 is formed in a lattice shape along a region between adjacent openings in a plan view of the light-scattering liquid crystal display panel 200, and blocks illumination light and external light, respectively. .

Therefore, the light receiving sensor 180 is preferably arranged inside the light scattering liquid crystal display panel 200. For example, the light receiving sensor 180 is formed with the black matrix 62 in a plan view of the light scattering liquid crystal display panel 200. In the region, it is preferable that the light scattering liquid crystal display panel 200 is disposed on the front side of the black matrix 62. In this case, the light receiving sensor 180 can be disposed in the region where the display pixel 80 is formed without covering the opening of the display pixel 80. Thereby, a decrease in the aperture ratio of the display pixel 80 can be suppressed.

A specific example in the case where the light receiving sensor 180 is arranged in a region where the black matrix 62 in the plan view of the light scattering liquid crystal display panel 200 is formed is shown below.

For example, as shown in FIG. 33, the light receiving sensor 180 may be disposed so as to be covered with the black matrix 62 on the backlight 300 side. As a result, the illumination light emitted from the backlight 300 is shielded by the black matrix 62 before being received by the light receiving sensor 180, so that the light receiving sensor 180 can obtain the received light information a1 to d1 from which the illumination light is excluded. Can do.

Further, as shown in FIG. 34, the light receiving sensor 180 may be arranged in the black matrix 62.

Further, the light receiving sensor 180 may be arranged in a region where the TFT 24 and the signal line 21 are formed in a plan view of the light scattering liquid crystal display panel 200. Since the TFT 24 and the signal line 21 have a light shielding property, the illumination light from the backlight 300 is shielded by the TFT 24 and the signal line 21. Since the light receiving sensor 180 disposed in the region where the TFT 24 and the signal line 21 are formed is disposed in the region where the illumination light is originally shielded, the aperture ratio of the display pixel 80 is not reduced. Thereby, it is possible to prevent the luminance of the display image from being lowered by the light receiving sensor 180 being arranged.

Further, the light receiving sensor 180 may be disposed on a member other than the light scattering liquid crystal display panel 200.

For example, as shown in FIG. 35 which is a partially enlarged plan view schematically showing the backlight, the light receiving sensor 180 may be arranged in the backlight 300. In this case, since the light receiving sensor 180 can be arranged in the display area 90 without covering the opening formed in the display pixel 80 of the light-scattering liquid crystal display panel 200, a decrease in the aperture ratio of the display pixel 80 can be prevented.

Further, the light receiving sensor 180 can be disposed inside the liquid crystal display panel 100, thereby suppressing a decrease in the aperture ratio of the light scattering liquid crystal display panel 200.

Further, the light receiving sensor 180 may be disposed between the liquid crystal display panel 100 and the backlight 300. In this case, since the light receiving sensor 180 is not directly provided on the light scattering liquid crystal display panel 200, the liquid crystal display panel 100, or the backlight 300, the structure of the light scattering liquid crystal display panel 200, the liquid crystal display panel 100, or the backlight 300 is changed. In addition, the light receiving sensor 180 can be provided. The light receiving sensor 180 can be disposed, for example, on a light receiving sensor support member that is sandwiched between the liquid crystal display panel 100 and the backlight 300. The light receiving sensor support member is preferably a transparent substrate having optical transparency, and an optical sheet sandwiched between the liquid crystal display panel 100 and the backlight 300 can also be used. When such a light receiving sensor support member is used, the light receiving sensor 180 can be disposed at a portion that cannot be disposed on the liquid crystal display panel 100, the light scattering liquid crystal display panel 200, or the backlight 300. For this reason, the freedom degree of the layout of a light receiving sensor can be improved. When the light receiving sensor 180 is arranged on the light receiving sensor support member, a plurality of light receiving sensor support members having different arrangement patterns of the light receiving sensors 180 can be provided. Accordingly, the arrangement of the light receiving sensors 180 can be changed by simply replacing any of the plurality of light receiving sensor support members. Therefore, the position of the light receiving sensor 180 can be easily changed according to the use of the display device 900 (for a television broadcast receiver, for an information display, etc.).

Embodiment 8
In the above-described Embodiments 2 to 7, the light receiving sensor is provided, and the predetermined image display area and the light / dark image display area are set according to the intensity of the external light applied to the display area. However, the scope of the present invention is not limited to such an embodiment. In the eighth embodiment, a predetermined image display area and a light / dark image display area are set based on priority information 423 indicating the priority of a display image.

As described with reference to FIG. 13 described above, the external processing device 421 has a plurality of images as data, and supplies a digital signal 424 including priority information 423 of each image to the control unit 550. The control unit 550 controls the liquid crystal display panel 100, the light scattering liquid crystal display panel 200, and the backlight 300 based on a digital signal including priority information 423 input from the external processing device 421. The image display control unit 500 sets a bright and dark image display area and a predetermined image display area based on the priority information indicating the priority of the display image, and displays it in the display area 90.

The priority information of each display image is not particularly limited, but can be set by appropriately considering the necessity / importance of information for the observer, the visibility of display, the novelty of information, and the like. . For example, when the display device 900 is installed in a station premises, the observer pays attention to the arrival time of the train with priority, so the priority information of the light-dark image 711 as the time display image is predetermined as a news telop. It is set higher than the image 721. FIG. 36 is a diagram showing a specific example in which a bright and dark image and a predetermined image are displayed in the display area in consideration of image priority information. Since the priority information of the light and dark image 711 as the time display image is set higher than the predetermined image 721 as the news telop, the light and dark image 711 is set larger than the predetermined image 721 as shown in FIG. It is desirable to set the image display area in correspondence with the priority of the priority information. The ratio of displaying an image with a higher priority than an image with a lower priority is not particularly limited, and can be set as appropriate in consideration of the priority of each image.

Also, the priority information of each image can be changed depending on the time. For example, in the case where the display device 900 is installed in a station yard as in the above-described specific example, the observer is in the morning time zone (for example, 7:00 am to 9:00 am) because it is commuting to school. Gives priority to the arrival time of trains, but in the daytime hours (for example, from 11:00 am to 3:00 pm), it is used for shopping and walking, so the observer gives priority to the news over the arrival time of the train. pay attention to. Therefore, for example, in the morning time zone, the priority information of the light and dark image 711 as the time display image is set higher than the priority information of the predetermined image 721 as the news telop, while in the daytime time zone, the priority information is set as the news telop. The priority information of the predetermined image 721 can be set higher than the priority information of the light and dark image 711 as the time display image.

FIG. 37 is a diagram showing a specific example in which a bright and dark image and a predetermined image are displayed when priority information of an image is changed in different time zones. As shown in FIG. 37, unlike FIG. 36, for example, in the daytime period, the predetermined image 721 as a news telop has higher priority information than the light and dark image 711 as a time display image. It is displayed larger than 711. When the predetermined image 721 is displayed larger than the light and dark image 711, the predetermined image 721 can be displayed in a plurality of stages such as a two-stage display as shown in FIG.

Embodiment 9
In the above-described eighth embodiment, the predetermined image display area and the light / dark image display area are set based on the priority information indicating the priority of the display image. However, the scope of the present invention is not limited to such an embodiment. In the ninth embodiment, a predetermined image display area and a light / dark image display area are set based on image information 422 indicating the display content of the display image.

As described with reference to FIG. 13 described above, the external processing device 421 has a plurality of images as data, and supplies a digital signal 424 including image information 422 of each image to the control unit 550. The control unit 550 controls the liquid crystal display panel 100, the light scattering liquid crystal display panel 200, and the backlight 300 based on a digital signal including image information 422 input from the external processing device 421. The image display control unit 500 sets a bright and dark image display area and a predetermined image display area based on the image information 422 indicating the display content of the display image, and displays it in the display area 90.

The image information 422 is not particularly limited, but can be set by appropriately considering, for example, the visibility of the display based on the shape or color of the displayed image itself, the novelty of the information, and the like. Considering the ease of viewing information display, for example, the news telop needs to set a relatively long time for each character to be displayed on the screen, so that the size per character is preferably relatively small. In addition, for example, a weather mark indicating tomorrow's weather is preferably set relatively large because it is difficult to distinguish it from other weather marks if the size of the symbol is small. FIG. 38 is a diagram illustrating a specific example in which a bright and dark image and a predetermined image are displayed in the display area in consideration of the display content of the display image. As shown in FIG. 38, the light and dark image 711 as a weather mark is set to be relatively large, and the predetermined image 721 as a news telop is set to be relatively small.

Note that, unlike the display mode shown in FIG. 38, considering the degree of novelty of information, for example, when the predetermined image 721 as a news telop is new information, it is preferable to set it relatively large as a weather mark. If the bright and dark image 711 is information that has already been repeated, it is preferable to set the light and dark image 711 to be relatively small.

<< Embodiment 10 >>
In the first embodiment described above, the illumination unit 302 of the backlight 300 corresponding to the light / dark image display area 710 is turned off, and an image composed of a combination of bright color display and dark color display is displayed on the light scattering liquid crystal display panel 200. However, the present invention is not limited to such an embodiment.

In the tenth embodiment, the entire illumination unit 302 of the backlight 300 corresponding to the light / dark image display area 710 is not turned off, but the whole is turned on dimly in a low power consumption state. Even in such a case, content display can be performed while saving power consumption in the light and dark image display area 710.

It is also possible to turn on a part of the irradiation unit 302 of the backlight 300 corresponding to the light and dark image display area 710 and turn off the other part. FIG. 39 illustrates a display mode in which the irradiation unit 302 corresponding to the portion where the dark color display is formed is turned off and the irradiation unit 302 corresponding to the portion where the bright color display is formed is turned on in the light / dark image display area 710. FIG. Here, a case where the display device 900 is configured with the three transparent substrates illustrated in FIG. 4 will be described as an example. As shown in FIG. 39, the backlight control unit 501 turns off the irradiation unit 302 of the backlight 300 corresponding to the place where the dark color display (for example, black display B) is formed on the light-scattering liquid crystal display panel 200. On the other hand, the irradiation unit 302 of the backlight 300 corresponding to a place where a bright color display (for example, white display W) is formed on the light-scattering liquid crystal display panel 200 is turned on. The image display control unit 500 keeps the liquid crystal layer 26 of the liquid crystal display panel 100 in a light transmission state.

Thereby, by turning on the irradiation unit 302 of the backlight 300 corresponding to the place where the bright color display is formed, the light of the backlight 300 is scattered by the liquid crystal molecules 38 in the random state, and scattered light is generated. As a result, the contrast between the light color display and the dark color display can be enhanced by supplementing the light color display.

<< Embodiment 11 >>
FIG. 40 is a block diagram schematically illustrating a wiring structure and a control unit of the display device 900 according to the eleventh embodiment. FIG. 41 is a timing chart showing intermittent driving of the backlight.

The display device 900 according to the eleventh embodiment is configured such that the backlight 300 is intermittently driven. The display device 900 is intermittently driven so as to alternately switch the light-off period and the light-on period during which the backlight 300 is lit so that there is a light-out period during which the backlight 300 is turned off during the period when the image displayed in the display area 90 is switched. A control unit 540 is provided.

The intermittent drive control unit 540 is provided as a part of the control unit 550 as shown in FIG. A liquid crystal panel control signal is input from the liquid crystal panel control unit 520 to the intermittent drive control unit 540. The intermittent drive control unit 540 detects an image switching period in which the display image is switched from the liquid crystal panel control signal, creates a turn-off signal based on the image switching period, and sends it to the power input unit 242.

The power input unit 242 stops the power supply to the irradiation unit 302 during a predetermined period in the image switching period (one frame) based on the turn-off signal. As a result, the irradiation unit 302 of the backlight 300 is controlled so that there is an extinguishing period in one frame, as shown in FIG.

Then, the image display control unit 500 may control to set the predetermined image display area 720 and the like based on the light reception information a1 to d1 obtained by the light reception sensor 180 during the extinguishing period of the backlight 300. At this time, as shown in FIG. 41, the image display control unit 500 has a predetermined adoption period t in which the light reception information a1 to d1 obtained by the light reception sensor 180 is employed. BL indicates lighting of the backlight. DC indicates switching of images in one frame (1F). This adoption period t is determined to be the same as the turn-off period of the backlight 300.

The received light information a1 to d1 during the extinguishing period of the backlight 300 thus obtained does not include illumination light emitted from the backlight 300. The image output setting unit 532 of the image display control unit 500 accurately reflects the external light that irradiates the display area 90 based on the light reception information that does not include illumination light, and the light and dark image display area 710 and the predetermined image display area. 720 can be set.

In addition to the light reception information a1 to d1 obtained by the light reception sensor 180 during the lighting period, the image display control unit 500 receives the light reception information a1 to d1 obtained by the light reception sensor 180 during the lighting period and the light reception sensor during the extinction period. The predetermined image display area 720 or the like may be set based on the difference from the light reception information a1 to d1 obtained by 180.

In this case, the image display control unit 500 obtains the light reception information a1 to d1 of the illumination light by obtaining the difference between the light reception information a1 to d1 obtained during the lighting period and the light reception information a1 to d1 obtained during the extinguishing period. calculate. Then, the image display control unit 500 sets the predetermined image display area 720 and the like based on the calculated light reception information a1 to d1 of the illumination light and the light reception information a1 to d1 obtained by the light reception sensor 180. Thus, the predetermined image display area 720 can be appropriately set reflecting the current brightness of the illumination light. Therefore, even if the brightness of the illumination light generated from the irradiation unit 302 changes with ambient temperature change or aging deterioration, the display of the predetermined image 721 or the like can be appropriately controlled.

<< Embodiment 12 >>
In Embodiment 1 described above, color filter layers having different colors for each pixel are formed. However, when performing color display, the present invention is not limited to such an embodiment. In the twelfth embodiment, color display is performed by mixing a dye into the memory liquid crystal layer 36. 42A and 42B are diagrams illustrating an embodiment in which color display is performed by mixing a dye into the memory liquid crystal layer 36. FIG. 42A shows a case where the emitted light of the mixed dye is absorbed. FIG. 42B shows the case where the emitted light of the mixed pigment is irradiated to the outside. Here, a case where the display device 900 is configured with the three transparent substrates illustrated in FIG. 4 will be described as an example.

When the mixed dye is, for example, a green dye, when no electric field is formed with respect to the memory liquid crystal layer 36, as shown in FIG. 42A, the green light 160 is absorbed by the green dye mixed with the liquid crystal molecules and visually recognized. Although it is not emitted in the direction, the emitted light 161 other than the green light is not absorbed by the green dye, but is scattered by the green dye mixed in the liquid crystal molecules, and a display with an enlarged viewing angle can be obtained. On the other hand, when an electric field is formed on the memory liquid crystal layer 36, as shown in FIG. 42B, the green light 160 is emitted without being absorbed by the dye, and the emitted light 161 other than the green light is also mixed into the liquid crystal molecules. Since the green pigment is scattered and emitted without being absorbed, all incident light is emitted and becomes white light. As described above, for example, color display can be performed by mixing red, green, and blue primary color pigments for each pixel.

<< Embodiment 13 >>
In the thirteenth embodiment, an embodiment in which the viewing angle dependency of the image of the predetermined image display area 720 is made variable will be described. 43A and 43B are diagrams illustrating an embodiment in which the viewing angle dependency of an image in the predetermined image display area 720 is variable. FIG. 43A shows a case where display with less visual dependency is performed. FIG. 43B shows a case where a display with much visual dependency is performed. Here, a case where the display device 900 is configured with the three transparent substrates illustrated in FIG. 4 will be described as an example.

As shown in FIG. 43A, when the electric field is formed so that the liquid crystal molecules are aligned with respect to the memory liquid crystal layer 36, the liquid crystal molecules are arranged substantially parallel to the electric field by the applied electric field. The light is emitted as it is. For this reason, display with high visual dependency (display with a narrow viewing angle) is possible. For example, when the display device 900 according to this embodiment is used as a digital signage display device, display is performed for a small number of observers. In addition, the brightness and contrast ratio can be increased.

On the other hand, as shown in FIG. 43B, when a display with little visual dependency is performed (when a display with a wide viewing angle is performed), the liquid crystal molecules are in a random state (or a state between a completely random state and an alignment state). An electric field is formed with respect to the memory liquid crystal layer 36 in such a manner. Thereby, the emitted light scattered isotropically over the entire viewing angle is emitted. Therefore, for example, when the display device 900 according to the present embodiment is used as a digital signage display device, it is advantageous when displaying in a wide visual range for a large number of viewers.

<< Embodiment 14 >>
In the fourteenth embodiment, the light mirror display 40 is formed to reflect the external light that has entered the memory liquid crystal layer 36 and to scatter the light within the memory liquid crystal layer 36, thereby enhancing the bright color display.

FIG. 44 is an explanatory diagram of the display device 900 on which the reflecting mirror plate 40 is formed. Here, a case where the display device 900 is configured with the three transparent substrates illustrated in FIG. 4 will be described as an example. The reflecting mirror plate 40 is formed in a region that is not a region for forming a light transmission state in the memory liquid crystal layer 36 of the light-scattering liquid crystal display panel 200. Here, the region that is not the region that forms the light transmission state is a region that does not contribute to the light transmission state, and is not particularly limited, but is, for example, the upper portion of the wiring on the pixel. Further, for example, when the color filter layer 63 is provided and the black matrix 62 is provided so as to partition each pixel, the black matrix 62 does not transmit light and therefore does not contribute to the light transmission state. The region directly below is a region that is not a region that forms a light transmission state. In FIG. 44, the reflecting mirror plate 40 is disposed in a region directly below the black matrix 62 and inside the front surface of the common transparent substrate 15. The image display control unit 500 puts the liquid crystal layer 26 of the liquid crystal display panel 100 in a light non-transmissive state in the light / dark image display area 710. The backlight control unit 501 turns off the irradiation unit 302 of the backlight 300 corresponding to the light and dark image display area 710.

At a predetermined location of the light-scattering liquid crystal display panel 200, the liquid crystal molecules 38 in the memory liquid crystal layer 36 are set in a random state, and the memory liquid crystal layer 36 of the light-scattering liquid crystal display panel 200 is changed into a light scattering state. By scattering, light color display (for example, white display W) is performed at a predetermined position on the light-scattering liquid crystal display panel 200. The incident light 164 that has entered the vicinity of the pixel electrode 23 without being scattered by the liquid crystal molecules 38 is reflected by the reflecting mirror plate 40 and is scattered by the liquid crystal molecules 38, thereby performing bright color display. In other parts of the light-scattering liquid crystal display panel 200, the incident light 162 is incident on the light-transmitting memory liquid crystal layer 36 and is not reflected, resulting in dark color display (for example, black display B). Thereby, it is possible to enhance the contrast ratio of the image by enhancing the bright color display.

<< Embodiment 15 >>
In the above-described embodiments 1 to 14, the display device 900 is configured to include the single light-scattering liquid crystal display panel 200 and the single liquid crystal display panel 100. However, the scope of the present invention is such a range. The present invention is not limited to the embodiment.

In the fifteenth embodiment, as shown in FIG. 45, a display unit 800 is configured by including a single light-scattering liquid crystal display panel 200 and a single liquid crystal display panel 100. The display units 800 (11) to 800 (86) are arranged in a matrix. That is, a plurality of display units 800 (11) to 800 (86) constituting the display area 90 constitute one display screen.

In the display area 90, a light / dark image display area 710 for displaying a light / dark image 711 and a predetermined image display area 720 for displaying a predetermined image 721 are formed. In the display device 900, a plurality of light receiving sensors 180 are provided in a distributed manner. For example, a predetermined number of light receiving sensors 180 are arranged for each of the display units 800 (11) to 800 (86).

The display device 900 further includes a control unit 550 that controls the display area 90. Signals are input to the control unit 550 from the light receiving sensor 180 and the external processing device 421. The external processing device 421 is constituted by, for example, a plurality of personal computers (PCs) operated by an administrator of the display device 900, and has image information 422 and priority information 423, respectively. The control unit 550 is an electronic processing device, and includes a liquid crystal panel control unit 520, a backlight control unit 501, a signal input unit 521, a power source 522, and an image display control unit 500. The control unit 550 is configured to control each of the display units 800 (11) to 800 (86) based on signals input from the light receiving sensor 180 and the external processing device 421. The image display controller 500 individually drives each of the display units 800 (11) to 800 (86). That is, the image display control unit 500 drives each light scattering liquid crystal display panel 200 individually, and for example, driving power for the alignment of the memory liquid crystal layer 36 is individually controlled. In addition, the image display control unit 500 also drives each liquid crystal display panel 100 individually, and for example, driving power for alignment of the liquid crystal layer 26 is individually controlled.

Since each light scattering liquid crystal display panel 200 and each liquid crystal display panel 100 can be individually controlled, in FIG. 45, for example, display units 800 (12), 800 (13), 800 (14), 800 ( 15), 800 (22), 800 (23), 800 (24), 800 (25), 800 (32), 800 (33), 800 (34), and 800 (35) are dark and light colors. A bright and dark image consisting of display is displayed, and for example, 800 (61), 800 (62), 800 (63), 800 (64), 800 (65), 800 (66), 800 (71), 800 (72 ), 800 (73), 800 (74), 800 (75), and 800 (76) make the light-scattering liquid crystal layer of the light-scattering liquid crystal display panel 200 in a light-transmitting state. Image to view the. And for example, display units 800 (11), 800 (16), 800 (21), 800 (26), 800 (31), 800 (36), 800 (41), 800 (42), 800 (43), 800 (44), 800 (45), 800 (46), 800 (51), 800 (52), 800 (53), 800 (54), 800 (55), 800 (56), 800 (81), 800 (82), 800 (83), 800 (84), 800 (85), and 800 (86) make the light-scattering liquid crystal layer of the light-scattering liquid crystal display panel 200 in a light-transmitting state, thereby saving power consumption. The driving of the liquid crystal display panel 100 is stopped for the purpose of the conversion. As described above, since each display unit 800 can be individually controlled, even when the display device 900 is enlarged, it is possible to save the driving power. It is also possible to reduce the influence of the frame, which is a non-display portion around the display area 90.

FIG. 46 is a diagram for explaining a state in which a bright / dark image display area 710 and a predetermined image display area 720 are set when external light is irradiated on the display area 90. In the image display control unit 500, a reference value is predetermined for the light reception information obtained by each light reception sensor 180 arranged in each display unit 800. Then, as shown in FIG. 46, when the light receiving information exceeding the reference value is obtained by the light receiving sensor 180, the image display control unit 500 displays the light / dark image display area 710 in the display area 90 based on the light receiving information. A predetermined image display area 720 is set, a light / dark image 711 is displayed in the light / dark image display area 710, and a predetermined image 721 is displayed in the predetermined image display area 720.

Furthermore, the third area 730 can be set in an area other than the bright and dark image display area 710 and the predetermined image display area 720 in the display area 90. By providing the third area 730, variations in display in the display area 90 can be increased. In the third area 730, display other than the bright and dark image 711 and the predetermined image 721 or non-display of the image can be performed. When no image is displayed in the third area 730, the ratio of the third area 730 in the display area 90 Only power saving is possible. Further, since each light scattering liquid crystal display panel 200 and each liquid crystal display panel 100 can be individually controlled, in FIG. 46, display units 800 (11), 800 (16), 800 (26), 800 ( 31), 800 (36), 800 (41), 800 (42), 800 (43), 800 (44), 800 (45), 800 (46), 800 (51), 800 (52), 800 ( 53), 800 (54), 800 (55), and 800 (56) make the light-scattering liquid crystal layer of the light-scattering liquid crystal display panel 200 in a light-transmitting state, thereby reducing the power consumption. The driving of 100 is stopped, and thus it is possible to save driving power.

By combining a plurality of display units 800 to form a single display screen as in this embodiment, for example, an information display or building used as an information transmission medium such as a signboard, an advertisement, or a sign installed outdoors A large display device such as a board display can be configured.

In the above-described embodiment, the light receiving sensor 180 is provided in each display unit 800, and the predetermined image display area 720 and the light / dark image display area 710 are set based on the light receiving information obtained by the light receiving sensor. The present invention is not limited to such an embodiment, and the predetermined image display area 720 and the bright / dark image display area 710 can be set based on priority information indicating the priority of the display image. Also, it is possible to set the predetermined image display area 720 and the light / dark image display area 710 based on the display content of the display image.

Embodiment 16
FIG. 47 is a block diagram schematically showing the display module 920. As shown in FIG. When the display device 900 is manufactured, the display module 920 is manufactured in the manufacturing process. The display module 920 is disposed to face the backlight 300 to constitute the display device 900, and as shown in FIG. 47, the display device 900 having a display area 90 in which a plurality of pixels are disposed, and a plurality of light receiving sensors. 180, a calculation unit 112, and an output terminal 114. The display device 900 is configured to be able to simultaneously display a plurality of images in the display area 90.

The light receiving sensors 180 are distributed in the display area 90 so as to receive external light emitted from the opposite side of the backlight 300 to the display area 90. Based on the light reception information a1 to d1 obtained by the light receiving sensor, the arithmetic unit 112 creates a control signal for controlling graphic display, illumination light in an area including the light / dark image display area 710 and the predetermined image display area 720, and the like. . The output terminal 114 outputs the control signal created by the calculation unit 112.

When this display module 920 is used, the light / dark image 711 displayed in the light / dark image display area 710 and the predetermined image 721 displayed in the predetermined image display area 720 are based on the light reception information a1 to d1 obtained by the light receiving sensor 180. A display device 900 capable of display control can be manufactured.

Further, the display module 920 including the image display control unit 500 can be created by connecting the image display control unit 500 to the output terminal 114. In this case, the image display control unit 500 has predetermined reference values for the received light information a1 to d1 obtained by the light receiving sensor 180, and the received light information a1 to d1 exceeding the reference value is obtained by the received light sensor 180. If this is the case, based on the received light information a1 to d1, a bright / dark image display area 710 and a predetermined image display area 720 are set in the display area 90, a bright / dark image 711 is displayed in the bright / dark image display area 710, and A predetermined image 721 is displayed in the predetermined image display area 720.

<< Other Embodiments >>
In the above-described embodiment, the liquid crystal display panel 100 is used as the image display panel. However, the present invention is not limited to such an embodiment, and examples of the image display panel include an organic EL display panel and an inorganic EL display panel. Various image display panels in which display elements are formed on a pair of glass substrates and the pair of glass substrates are arranged to face each other can be used as in a plasma display panel.

In addition, the usage example of the display device 900 according to the above embodiment is not limited to digital signage. For example, a liquid crystal television, a personal computer, an electronic book, a digital still camera, a video tape recorder, It can be suitably used as image display means for car navigation devices, calculators, electronic notebooks, word processors, workstations, videophones, POS terminals and the like.

Since the display device according to the present invention can display information that can be sufficiently used as an advertisement / identification medium even in a power-saving state, it can be suitably used for advertisement display such as digital signage.

11: First transparent substrate 12: Second transparent substrate 13: Third transparent substrate 14: Fourth transparent substrate 15: Common transparent substrate 21: Signal line 22: Scan line 23, 33: Pixel electrode 24: Thin film transistor (TFT)
25, 35: Counter electrode 26: Liquid crystal layer 29, 39: Sealing material 30: Control signal line 31: Lower polarizing plate 32: Upper polarizing plate 36: Memory liquid crystal layer 38: Liquid crystal molecule 40: Reflecting mirror plate 62: Black matrix 80: Display pixel 90: Display area 100: Liquid crystal display panel 110: Gate driver 120: Source driver 180: Optical sensor 200: Light scattering liquid crystal display panel 300: Backlight 301: Backlight chassis 302: Irradiation unit 410: Electronic signage device 411 : Communication circuit control unit 412: Received data memory 413: Browser memory 414: URL memory 420: Internet 421: External processing device 422: Image information 423: Priority information 500: Image display control unit 501: Backlight control unit 520: Liquid crystal panel Control unit 521: signal input unit 52 : Power 540: intermittent drive control unit 710: light-and-dark image display area 711: light-and-dark image 720: predetermined image display area 721: the predetermined image 730: third area 800: display unit 900: liquid crystal device 910: an image display system 920: display module

Claims

A light-scattering liquid crystal display panel in which a light-scattering liquid crystal layer is sandwiched between transparent substrates;
An image display panel disposed on the back side of the light-scattering liquid crystal display panel and forming an image, and a display device comprising:
By combining the display area of the display surface with a dark color display in which the light scattering liquid crystal layer is in a light transmission state and a light color display in which the light scattering liquid crystal layer is in a light scattering state at a location different from the dark color display. By displaying the light / dark image display area for displaying the light / dark image and the light scattering liquid crystal layer in a light transmitting state, a predetermined image formed on the image display panel is displayed via the light scattering liquid crystal display panel. A display device comprising: an image display control unit configured to control a predetermined image display area to be set.
A plurality of light receiving sensors for receiving external light applied to the display area of the display surface of the display device;
In the image display control unit, a reference value is predetermined for the light reception information obtained by the light reception sensor, and when the light reception information exceeding the reference value is obtained by the light reception sensor, the light reception information is included in the light reception information. The display device according to claim 1, wherein the predetermined image display area and the bright / dark image display area are set based on the predetermined image display area.
3. The display device according to claim 2, wherein the image display control unit changes a size of the light / dark image according to a size of the light / dark image display area.
4. The display device according to claim 2, wherein the image display control unit changes a size of the predetermined image according to a size of the predetermined image display area.
The image display control unit is configured such that, based on the light reception information obtained by the light reception sensor, the main area of the predetermined image display area is excluded from the display area except for a part where the light reception information exceeding the reference value is obtained. The display device according to any one of claims 2 to 4, wherein an area is set.
The image display control unit includes at least the predetermined image display area in an area excluding a part of the display area where light reception information exceeding the reference value is obtained based on light reception information obtained by the light reception sensor. The display device according to claim 2, wherein the display device is set so as to be positioned at a central portion.
The image display control unit sets the predetermined image display area in an area excluding a part of the display area where light reception information exceeding the reference value is obtained based on light reception information obtained by the light reception sensor. The display device according to claim 2, wherein the display device is a display device.
The image display control unit sets a main region of the bright and dark image display area in a region where light reception information exceeding the reference value is obtained in the display region based on light reception information obtained by the light reception sensor. The display device according to claim 2, wherein the display device is a display device.
The image display control unit sets a central portion of the bright and dark image display area in a region where light reception information exceeding the reference value is obtained in the display region based on light reception information obtained by the light reception sensor. The display device according to claim 2, wherein the display device is a display device.
The image display control unit sets the bright and dark image display area in an area where light reception information exceeding the reference value is obtained in the display area based on light reception information obtained by the light reception sensor. The display device according to any one of claims 2 to 7.
The image display control unit, when dividing the display area into two areas of right and left or upper and lower areas having the same area, has a small area of the part where the received light information exceeding the reference value is obtained in the two areas 5. The display device according to claim 2, wherein the predetermined image display area is set in one area, and the bright and dark image display area is set in the other area. 6.
An altitude reference value higher than the reference value is predetermined for the light reception information obtained by the light reception sensor, and when the light reception information exceeding the height reference value is obtained by the light reception sensor, the image display The control unit sets the predetermined image display area and the light / dark image display area in an area excluding a part of the display area where the received light information exceeding the altitude reference value is obtained based on the received light information. The display device according to claim 2, wherein the display device is a display device.
An altitude reference value higher than the reference value is predetermined for the light reception information obtained by the light reception sensor, and the area obtained by the light reception sensor for the light reception information exceeding the altitude reference value is the area of the display region. 5. The display according to claim 2, wherein when the ratio exceeds a certain ratio, the image display control unit temporarily stops displaying an image in the display area. 6. Display device.
An altitude reference value higher than the reference value is predetermined for the light reception information obtained by the light reception sensor, and light reception information exceeding the altitude reference value is obtained by the light reception sensor in the central portion of the display area. 5. The display device according to claim 2, wherein the image display control unit temporarily stops displaying an image in the display area when the display is performed.
The image display control unit, when continuously receiving light information exceeding the reference value is obtained by the light receiving sensor at a predetermined time, based on the light reception information, the predetermined image display area and the brightness / darkness. The display device according to claim 2, wherein an image display area is set.
The display device according to any one of claims 2 to 15, wherein the light receiving sensors are distributed in the display area.
The display device according to claim 16, wherein the light receiving sensors are respectively disposed in regions where the pixels are formed in a plan view of the liquid crystal panel.
17. The display device according to claim 16, wherein the light receiving sensors are distributed along a line set so as to cross or longitudinally cross the display area.
The display area is rectangular,
The display device according to claim 16, wherein the light receiving sensor is arranged in the display area along a line connecting the midpoints of at least two opposite sides of the four sides of the display area.
The display area is rectangular,
The display device according to claim 16, wherein the light receiving sensor is arranged at a peripheral portion of the display area along at least two opposite sides of the four sides of the display area.
The display area is rectangular,
The display device according to claim 16, wherein the light receiving sensor is disposed along at least one of diagonal lines of the display area.
Priority information indicating the priority of the display image is predetermined for each display image,
The display device according to claim 1, wherein the image display control unit sets the predetermined image display area and the bright / dark image display area based on the priority information.
The display device according to claim 22, wherein the priority of the priority information is changed depending on time.
The display device according to claim 1, wherein the image display control unit sets the predetermined image display area and the bright and dark image display area based on display content of a display image.
The image display control unit sets a third area other than the predetermined image display area and the bright / dark image display area in a display area of a display surface of a display device. The display device according to item.
26. The display device according to claim 25, wherein no image is displayed in the third area.
The image display panel is a liquid crystal display panel configured by sandwiching a liquid crystal layer between transparent substrates,
A backlight for illuminating illumination light on the back side of the liquid crystal display panel;
The display device according to any one of claims 1 to 26, further comprising: a backlight control unit that controls lighting and extinguishing states of the backlight.
28. The display device according to claim 27, wherein the image display control unit sets a liquid crystal layer of the liquid crystal display panel corresponding to the light and dark image display area in a light non-transmissive state.
The backlight control unit turns on a backlight corresponding to the predetermined image display area, while turning off a backlight corresponding to the light and dark image display area, or turns it on in a low power consumption state. The display device according to claim 27 or 28.
The backlight has a plurality of light emitting portions,
The backlight control unit turns on a backlight corresponding to the predetermined image display area, while turning on a part of the light emitting unit of the backlight corresponding to the light / dark image display area, and enters the light / dark image display area. 29. The display device according to claim 27 or 28, wherein the other part of the light emitting unit of the corresponding backlight is turned off.
The image display panel is a liquid crystal display panel configured by sandwiching a liquid crystal layer between transparent substrates,
A backlight for illuminating illumination light on the back side of the liquid crystal display panel;
A backlight control unit for controlling the lighting and extinguishing state of the backlight;
An intermittent drive controller that alternately switches between a turn-off period for turning off the backlight and a turn-on period for turning on the backlight;
The image display control unit sets the predetermined image display area and the light / dark image display area based on light reception information obtained by the light reception sensor when the backlight is turned off by the intermittent drive control unit. The display device according to claim 2, wherein the display device is a display device.
The display device according to any one of claims 2 to 21, wherein the light receiving sensor is disposed inside the light scattering liquid crystal display panel.
32. The display device according to claim 31, wherein the light receiving sensor is disposed inside the liquid crystal display panel.
32. The display device according to claim 31, wherein the light receiving sensor is disposed in the backlight.
32. The display device according to claim 31, wherein the light receiving sensor is disposed between the liquid crystal display panel and the backlight.
31. The transparent substrate on the front side of the image display panel and the transparent substrate on the back side of the light-scattering liquid crystal display panel are a single transparent substrate in common. The display device according to item.
The display device according to any one of claims 1 to 36, wherein the light-scattering liquid crystal layer is a memory liquid crystal layer.
Receive data including at least one of video data and audio data of digital signage content distributed via digital broadcast waves of the Internet or a broadcasting station, and display the received digital signage content on the light scattering liquid crystal display The display device according to any one of claims 1 to 37, wherein display is performed on at least one of a panel and the image display panel.
The light-scattering liquid crystal display panel is a collection of a plurality of individual light-scattering liquid crystal display panels configured by sandwiching a light-scattering liquid crystal layer between transparent substrates, forming a single display panel as a whole,
39. The image display panel according to any one of claims 1 to 38, wherein a plurality of individual image display panels forming an image are aggregated to form one display panel as a whole. Display device.
40. The display device according to claim 39, wherein the image display control unit independently controls the individual light-scattering liquid crystal display panel and the individual image display panel.
A light-scattering liquid crystal display panel in which a light-scattering liquid crystal layer is sandwiched between transparent substrates;
An image display panel disposed on the back side of the light-scattering liquid crystal display panel and forming an image,
By combining the display area of the display surface with a dark color display in which the light scattering liquid crystal layer is in a light transmission state and a light color display in which the light scattering liquid crystal layer is in a light scattering state at a location different from the dark color display. By displaying the light / dark image display area for displaying the light / dark image and the light scattering liquid crystal layer in a light transmitting state, a predetermined image formed on the image display panel is displayed via the light scattering liquid crystal display panel. And a predetermined image display area that is set to have a display panel.
A light-scattering liquid crystal display panel in which a light-scattering liquid crystal layer is sandwiched between transparent substrates;
An image display panel disposed on the back side of the light-scattering liquid crystal display panel to form an image;
A plurality of light receiving sensors for receiving external light irradiated on a display area of a display surface, and a display module comprising:
A reference value is predetermined for the light reception information obtained by the light reception sensor, and when the light reception information exceeding the reference value is obtained by the light reception sensor, the light scattering property is based on the light reception information. A light-dark image display area for displaying a light-dark image by combining a dark-color display in which the liquid crystal layer is in a light-transmitting state and a light-color display in which the light-scattering liquid crystal layer is in a light-scattering state at a location different from the dark color display; A predetermined image display area for displaying a predetermined image formed on the image display panel via the light scattering liquid crystal display panel by setting the light scattering liquid crystal layer in a light transmitting state. A display module which is set to have a display area.
A light-scattering liquid crystal display panel in which a light-scattering liquid crystal layer is sandwiched between transparent substrates, and a display device having an image display panel disposed on the back side of the light-scattering liquid crystal display panel to form an image;
An image display system comprising: an external processing device that creates an image signal for displaying an image on a display area of a display surface and sends the image signal to the display device,
By combining the display area of the display surface with a dark color display in which the light scattering liquid crystal layer is in a light transmission state and a light color display in which the light scattering liquid crystal layer is in a light scattering state at a location different from the dark color display. By displaying the light / dark image display area for displaying the light / dark image and the light scattering liquid crystal layer in a light transmitting state, a predetermined image formed on the image display panel is displayed via the light scattering liquid crystal display panel. And a predetermined image display area, and an image display control unit configured to have a predetermined image display area.
A light-scattering liquid crystal display panel in which a light-scattering liquid crystal layer is sandwiched between transparent substrates;
An image display panel that is disposed on the back side of the light-scattering liquid crystal display panel and forms an image.
By combining the display area of the display surface with a dark color display in which the light scattering liquid crystal layer is in a light transmission state and a light color display in which the light scattering liquid crystal layer is in a light scattering state at a location different from the dark color display. By displaying the light / dark image display area for displaying the light / dark image and the light scattering liquid crystal layer in a light transmitting state, a predetermined image formed on the image display panel is displayed via the light scattering liquid crystal display panel. An image display method for displaying an image so as to have a predetermined image display area.