JP2015225239A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device capable of reducing display panel burning while suppressing obstruction of video viewing by a viewer.SOLUTION: A display device 10 comprises: a display panel 13 including a first display region 13a which displays a video having a second aspect ratio different from a first aspect ratio of the display panel 13 and a second display region 13b which does not display the video; a control unit 30 which (i) turns off a second light source 24 for irradiating the second display region 13b with light and (ii) changes transmission characteristics of the display panel 13 in the second display region 13b when a video having the second aspect ratio is displayed on the display panel 13; and a light shielding member 17 which is arranged along the boundary between the first display region 13a and the second display region 13b and shields the light from a first space 18a formed between a reflection sheet 16 and the first display region 13a to a second space 18b formed between the reflection sheet 16 and the second display region 13b.

Description

  The present invention relates to a display device for displaying an image.

  For example, a liquid crystal display is known as a display device for displaying an image. In a liquid crystal display, even if another image is displayed after the same image is displayed for a long time, the image that has been displayed for a long time may continue to be displayed lightly. An image displayed in such a thin manner is called a ghost image. The phenomenon in which a ghost image is displayed is called burn-in.

  As a case where such burn-in is likely to occur, there is a case where an image having an aspect ratio different from the aspect ratio of the liquid crystal panel is displayed. For example, when an image having an aspect ratio of 4: 3 is displayed on a liquid crystal panel having an aspect ratio of 16: 9, areas adjacent to the right and left sides of the area (first display area) where the image is displayed A black image called a black belt continues to be displayed in each (second display area). While the black image continues to be displayed, the transmission characteristics of the display panel in the second display area do not change. As a result, image sticking occurs in the second display area where the black image is continuously displayed.

  Patent Document 1 discloses that an image displayed in the second display area is changed from a black image to a gray image when a predetermined condition is satisfied in order to reduce such burn-in of the liquid crystal panel. .

JP 2011-081178 A

  However, in the related art, the image displayed in the second display area adjacent to the first display area where the video is displayed changes, which hinders the viewer from viewing the video.

  Therefore, the present invention provides a display device capable of reducing the burn-in of the display panel while preventing the viewer from viewing the video.

  A display device according to one embodiment of the present invention is a display panel having a first aspect ratio, and when a video having a second aspect ratio different from the first aspect ratio is displayed, the video is displayed. And a first light source for irradiating light to the first display area and the second display area from the rear of the display panel, respectively. And when a video having the second aspect ratio is displayed on the display panel, (i) the second light source is turned off, and (ii) the second display area A control unit that changes the transmission characteristics of the display panel, a reflective sheet that is disposed behind the display panel and reflects light from the light source unit, the first display region, and the second A first space that is disposed along the boundary of the display area and formed between the reflection sheet and the first display area, and a second space that is formed between the reflection sheet and the second display area. A light shielding member that blocks light.

  According to this configuration, when an image having the second aspect ratio is displayed on the display panel, (i) the second light source for irradiating the second display area with the light is turned off, and (ii) the second The transmission characteristics of the display panel in the two display areas can be changed. That is, while the second light source is turned off, the transmission characteristics can be changed to prevent the display panel from being burned. Therefore, it is possible to suppress the viewer from seeing the change in the transmission characteristics of the display panel in the second display area. That is, it is possible to reduce the burn-in of the display panel while suppressing the viewer from viewing the video.

  Furthermore, according to this configuration, light from the first space to the second space can be blocked. Therefore, the light emitted from the first light source can be prevented from reaching the second display area. That is, it is possible to prevent the light from the first light source from being applied to the second display area from the rear of the display panel while changing the transmission characteristics of the display panel in the second display area. Therefore, it is possible to further suppress the viewer from viewing the change in the transmission characteristics of the display panel in the second display area. That is, it is possible to further suppress the viewer from viewing the video.

  For example, the light source unit further includes an elongated substrate disposed on the back side of the display panel, and the substrate is disposed across the first space and the second space across the light shielding member. The first light source may be disposed on the first space side on the substrate, and the second light source may be disposed on the second space side on the substrate.

  According to this configuration, the first light source is disposed on the first space side on the long substrate disposed across the light shielding member, and the second light source is disposed on the second space side on the substrate. That is, both the first light source and the second light source can be arranged on one long substrate, and the component configuration of the light source unit can be simplified.

  For example, the first light source and the second light source are electrically connected in series, and the display device further includes a first path for supplying power to the first light source and the second light source, and A switch that switches between a second path for bypassing the second light source and supplying power to the first light source, and the controller is configured to display an image having the second aspect ratio on the display panel. In addition, the second light source may be turned off by switching the switch to the second path.

  According to this configuration, the switch that switches between the first path for supplying power to the first light source and the second light source and the second path for bypassing the second light source and supplying power to the first light source. Can be provided. Therefore, it is possible to supply power only to the first light source among the first light source and the second light source electrically connected in series.

  Moreover, such a switch can also be arrange | positioned outside a board | substrate, for example. For example, when the first light source and the second light source are LEDs (Light Emitting Diode), an expensive member having high thermal conductivity is often used for the substrate. Therefore, if the switch is disposed outside the substrate, an increase in the area of the substrate can be suppressed, and the manufacturing cost of the display device can be reduced. It is also possible to prevent light from the first light source and the second light source from being blocked by the switch.

  For example, the light source unit further includes a first substrate disposed in the first space and a second substrate disposed in the second space, and the first light source is disposed on the first substrate. The second light source may be disposed on the second substrate.

  According to this configuration, the first light source and the second light source can be arranged on different substrates (first substrate and second substrate). Therefore, the supply / non-supply of power for the burn-in prevention process can be switched for each substrate. That is, it is possible to simplify the wiring and control for the burn-in prevention process.

  For example, the light shielding member may be formed integrally with the reflection sheet.

  According to this configuration, the light shielding member can be formed integrally with the reflection sheet. Therefore, the number of parts can be reduced. Furthermore, the light emitted from the first light source and the second light source can be efficiently applied to the first display area and the second display area.

  For example, when the video having the second aspect ratio is displayed on the display panel, the control unit is based on a transmission characteristic pattern for switching and displaying a plurality of images including at least one color image. The transmission characteristics of the display panel in the second display area may be changed.

  According to this configuration, it is possible to change the transmission characteristic of the display panel in the second display area based on the pattern of the transmission characteristic for switching and displaying a plurality of images including at least one color image. Accordingly, the transmission characteristics of each of the plurality of pixels having a plurality of colors (for example, red, green, and blue) can be independently changed. Therefore, it is possible to more effectively suppress burn-in of the display panel than when the transmission characteristics of a plurality of pixels are uniformly changed as in the case of displaying a gray image.

  The display device according to one embodiment of the present invention can reduce the burn-in of the display panel while suppressing the viewer from viewing the video.

1 is a perspective view illustrating an appearance of a display device according to Embodiment 1. FIG. 2 is an exploded perspective view of the display device according to Embodiment 1. FIG. 3 is a front view showing an internal structure of the display device according to Embodiment 1. FIG. 3 is a cross-sectional view of the display device according to Embodiment 1. FIG. 3 is a block diagram illustrating a functional configuration of the display device according to Embodiment 1. FIG. FIG. 6 is a front view of the display device for explaining the operation of the display device according to the first embodiment. 6 is a block diagram of a display device for explaining an operation of the display device according to Embodiment 1. FIG. 5 is a front view showing an internal structure of a display device according to Embodiment 2. FIG. 6 is a front view showing an internal structure of a display device according to Embodiment 3. FIG. 10 is a front view showing an internal structure of a display device according to Embodiment 4. FIG. 6 is a cross-sectional view of a display device according to Embodiment 4. FIG.

  Hereinafter, embodiments will be specifically described with reference to the drawings.

  It should be noted that each of the embodiments described below shows a comprehensive or specific example. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, and the like shown in the following embodiments are merely examples, and are not intended to limit the scope of the claims. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims are described as arbitrary constituent elements.

(Embodiment 1)
The display device according to Embodiment 1 will be described below. The display device according to the present embodiment turns off the second light source corresponding to the second display area where no video is displayed, and performs a process for reducing the burn-in on the display panel. Furthermore, the display device according to the present embodiment is disposed along the boundary between the first display area and the second display area in order to prevent light emitted from the first light source from reaching the second display area. A light shielding member is provided.

  In the following description, the horizontal direction of the screen is represented by the X axis, the vertical direction is represented by the Y axis, and the depth direction is represented by the Z axis.

[Structure of display device]
First, the structure of the display device will be described.

  FIG. 1 is a perspective view showing an appearance of the display device according to the first embodiment. FIG. 2 is an exploded perspective view of the display device according to the first embodiment.

  The display device 10 according to the present embodiment is, for example, a liquid crystal display. The display device 10 includes a front cabinet 11, a rear frame 12, a display panel 13, a reflection sheet 16, a light shielding member 17, and a light source unit 20.

  The front cabinet 11 is a rectangular frame that covers the outer periphery of the front surface of the display panel 13. The front cabinet 11 is made of resin, for example.

  The front surface is a surface on the side where video and images are displayed. That is, the front surface is a surface on the positive direction (front) side of the Z axis.

  The rear frame 12 covers the back surface of the display panel 13. The rear frame 12 is manufactured, for example, by press-molding a sheet metal of electrogalvanized steel (SECC: Steel Electrical Chromatated).

  The back surface is a surface opposite to the front surface. That is, the back surface is a surface on the negative direction (backward) side of the Z axis.

  As shown in FIG. 2, a display panel 13, a reflection sheet 16, a light shielding member 17, and a light source unit 20 are disposed between the front cabinet 11 and the rear frame 12.

  The display panel 13 displays an image and an image by changing the transmission characteristics when light incident from the back surface is emitted to the front surface for each local region. Specifically, the display panel 13 includes, for example, a plurality of pixels of a plurality of colors (for example, red, green, and blue) arranged in a matrix.

  The display panel 13 has a first aspect ratio. That is, the display panel 13 includes a screen having the first aspect ratio. The aspect ratio indicates the ratio between the long side and the short side of a two-dimensional object. Here, the aspect ratio indicates the ratio between the horizontal length and the vertical length of the display area on the display panel 13.

  In the present embodiment, the case where the display panel 13 is a liquid crystal panel having an aspect ratio of 16: 9 will be described. In this case, the display panel 13 includes, for example, a liquid crystal layer, a color filter, a transparent electrode, a polarizing filter, a diffusion plate, and the like.

  The reflection sheet 16 is disposed behind the display panel 13. Here, the reflection sheet 16 is disposed so as to cover the inner surface of the rear frame 12. The reflection sheet 16 reflects light from the light source unit 20 toward the back surface of the display panel 13. The reflection sheet 16 is made of acrylic resin, for example.

  The light shielding member 17 divides the space formed between the display panel 13 and the reflection sheet 16 into left and right. Details of the light shielding member 17 will be described later with reference to FIGS. 3 and 4.

  The light source unit 20 irradiates the back surface of the display panel 13 with light. In the present embodiment, the light source unit 20 is a direct type backlight unit.

  Next, details of the internal structure of the display device will be described.

  FIG. 3 is a front view showing the internal structure of the display device according to the first embodiment. In FIG. 3, in order to represent the internal structure of the display device 10, the display device 10 with the front cabinet 11 and the display panel 13 removed is shown.

  FIG. 4 is a cross-sectional view of the display device according to the first embodiment. Specifically, FIG. 4 is a cross-sectional view of the display device 10 in a state where the front cabinet 11 and the display panel 13 are attached along the line AA in FIG.

  As shown in FIG. 4, when a video having a second aspect ratio different from the first aspect ratio is displayed, the display panel 13 does not display the first display area 13a where the video is displayed and the video. And a second display area 13b. When a video having the first aspect ratio is displayed, the video is displayed over the first display area 13a and the second display area 13b.

  Here, a case where the first aspect ratio is 16: 9 and the second aspect ratio is 4: 3 is illustrated. In this case, the first display area 13a and the second display area 13b are arranged side by side in the horizontal direction.

  The light shielding member 17 is disposed along the boundary between the first display area 13a and the second display area 13b. The light blocking member 17 then transmits light from the first space 18a formed between the reflective sheet 16 and the first display region 13a to the second space 18b formed between the reflective sheet 16 and the second display region 13b. Block. That is, the light shielding member 17 has a light shielding property, and divides the space formed between the reflection sheet 16 and the display panel 13 into left and right. In other words, the light blocking member 17 optically and physically divides the optical path of light from the first light source (first LED 23 described later) and the optical path of light from the second light source (second LED 24 described later).

  In the present embodiment, the light shielding member 17 is formed integrally with the reflection sheet 16. Specifically, the light shielding member 17 is formed by bending a part of the reflection sheet 16 into a V shape. In this case, the light blocking member 17 blocks light from the first space 18a to the second space 18b by reflecting the light.

  The light source unit 20 includes three LED bars 21. Each of the LED bars 21 includes a long substrate 22, a first LED 23, and a second LED 24.

  The substrate 22 is disposed on the back side (rear side) of the display panel 13. The board | substrate 22 consists of material (for example, aluminum) with high heat dissipation and heat conductivity.

  The substrate 22 is arranged across the light shielding member 17 and over the first space 18a and the second space 18b. In the present embodiment, the substrate 22 extends in the horizontal direction through the light shielding member 17 extending in the vertical direction.

  The first LED 23 is an example of a first light source for irradiating light to the first display region 13 a from the rear of the display panel 13. The first LED 23 is disposed on the first space 18 a side on the substrate 22 and irradiates light to the first display region 13 a from the rear of the display panel 13. In the present embodiment, the first LED 23 is disposed at the center of the substrate 22 in the horizontal direction.

  The second LED 24 is an example of a second light source for irradiating light to the second display region 13b from the rear of the display panel 13. The second LED 24 is disposed on the second space 18 b side on the substrate 22 and irradiates light to the second display region 13 b from the rear of the display panel 13. Here, 2nd LED24 is arrange | positioned at the edge part of the board | substrate 22 in a horizontal direction.

  The first LED 23 and the second LED 24 are electrically connected in series. In the present embodiment, the first LED 23 is connected between the second LEDs 24. That is, lighting and extinguishing are basically controlled in units of the LED bar 21. However, in the present embodiment, the second LED 24 can be turned off when the first LED 23 is turned on.

[Functional structure of display device]
Next, the functional configuration of the display device 10 will be described.

  FIG. 5 is a block diagram illustrating a functional configuration of the display device according to the first embodiment. Here, only a part of the functions of the display device 10 is shown in order to prevent the description from becoming unnecessarily complicated.

  As shown in FIG. 5, the display device 10 includes a control unit 30, a drive source 31, and a switch 32.

  The control unit 30 controls the drive source 31, the switch 32, and the display panel 13, respectively. Specifically, when the video having the second aspect ratio different from the first aspect ratio is displayed on the display panel 13, the control unit 30 (i) turns off the second LED 24 and (ii) the second The transmission characteristics of the display panel 13 in the display area 13b are changed.

  The drive source 31 drives the light source unit 20. That is, the drive source 31 supplies power to the light source unit 20.

  The switch 32 switches between a first path for supplying power to the first LED 23 and the second LED 24 and a second path for bypassing the second LED 24 and supplying power to the first LED 23. Here, the switch 32 is disposed outside the substrate 22.

  Specifically, the switch 32 has a first terminal 32a, a second terminal 32b, and a third terminal 32c. The first terminal 32 a is connected to the drive source 31. The second terminal 32 b is connected to one terminal of the second LED 24. The third terminal 32 c is connected to the other terminal of the second LED 24. That is, the third terminal 32 c is connected to a terminal between the first LED 23 and the second LED 24.

  Therefore, if the first terminal 32a and the second terminal 32b are brought into conduction, a current flows through the first path, and both the first LED 23 and the second LED 24 emit light. Moreover, if the 1st terminal 32a and the 3rd terminal 32c conduct | electrically_connect, an electric current will flow into a 2nd path | route, 1st LED23 will light-emit, and 2nd LED24 will not light-emit.

[Operation of display device]
Next, the operation of the display device configured as described above will be described.

  FIG. 6 is a front view of the display device for explaining the operation of the display device according to the first embodiment. FIG. 7 is a block diagram of the display device for explaining the operation of the display device according to the first embodiment. 6 and 7, (a) shows a state in which the first video having the first aspect ratio is displayed, and (b) shows a state in which the second video having the second aspect ratio is displayed. .

  The control unit 30 determines whether or not the second video having the second aspect ratio is displayed on the display panel 13. For example, when a broadcast signal including a second video having the second aspect ratio is received, it is determined that the second video having the second aspect ratio is displayed on the display panel 13. When the video included in the broadcast signal includes an image that does not change with time, the control unit 30 determines whether the aspect ratio of the video from which the image is removed is the second aspect ratio. You may judge.

  Here, as shown in FIG. 6A, when the first video having the first aspect ratio is displayed on the display panel 13, the control unit 30 controls the entire display area of the display panel 13 (first display area). 13a and the second display area 13b) display the first video. At this time, the control unit 30 conducts the first terminal 32a and the second terminal 32b of the switch 32 as shown in FIG. That is, the control unit 30 controls the switch 32 to flow a current through the first path 34a, and turns on the first LED 23 and the second LED 24.

  On the other hand, as shown in FIG. 6B, when the second video having the second aspect ratio is displayed on the display panel 13, the control unit 30 displays the second video in the first display area of the display panel 13. To do. At this time, the control unit 30 conducts the first terminal 32a and the third terminal 32c of the switch 32 as shown in FIG. 7B. That is, the control unit 30 controls the switch 32 to flow a current through the second path 34 b and turns on only the first LED 23 among the first LED 23 and the second LED 24.

  Furthermore, when the second video having the second aspect ratio is displayed on the display panel 13, the control unit 30 changes the transmission characteristics of the display panel 13 in the second display region 13b. That is, the control unit 30 continuously or intermittently changes the transmission characteristics of the display panel 13 in the second display region 13b while the second image having the second aspect ratio is displayed on the display panel 13. In other words, the control unit 30 continuously or intermittently changes the voltage applied to the pixels included in the second display region 13b over time while the second image having the second aspect ratio is displayed on the display panel 13. .

  Specifically, for example, the control unit 30 sets the transmission characteristics of the display panel 13 in the second display region 13b based on a pattern of transmission characteristics for switching and displaying a plurality of images including at least one color image. Change. That is, the control unit 30 independently changes the transmission characteristics of each of a plurality of pixels having a plurality of colors (for example, red, green, and blue) constituting the display panel 13. However, even if the transmission characteristics of the display panel 13 are changed in this way, the second LED 24 is turned off, and thus no color image is displayed in the second display region 13b.

[effect]
As described above, according to the display device 10 according to the present embodiment, when an image having the second aspect ratio is displayed on the display panel, (i) the second for irradiating the second display area with light. The two light sources can be turned off, and (ii) the transmission characteristics of the display panel in the second display area can be changed. That is, while the second light source is turned off, the transmission characteristics can be changed to prevent the display panel from being burned. Therefore, it is possible to suppress the viewer from seeing the change in the transmission characteristics of the display panel in the second display area. That is, it is possible to reduce the burn-in of the display panel while suppressing the viewer from viewing the video.

  Furthermore, according to the display device 10 according to the present embodiment, it is possible to block light from the first space to the second space. Therefore, the light emitted from the first light source can be prevented from reaching the second display area. That is, it is possible to prevent the light from the first light source from being applied to the second display area from the rear of the display panel while changing the transmission characteristics of the display panel in the second display area. Therefore, it is possible to further suppress the viewer from viewing the change in the transmission characteristics of the display panel in the second display area. That is, it is possible to further suppress the viewer from viewing the video.

  Moreover, according to the display device 10 according to the present embodiment, the first light source is disposed on the first space side on the long substrate disposed across the light shielding member, and the second space side on the substrate is disposed. The second light source is arranged in That is, both the first light source and the second light source can be arranged on one long substrate, and the component configuration of the light source unit can be simplified.

  Further, according to the display device 10 according to the present embodiment, the first path for supplying power to the first light source and the second light source, and the power to be supplied to the first light source bypassing the second light source. A switch for switching between the second path and the second path can be provided. Therefore, it is possible to supply power only to the first light source among the first light source and the second light source electrically connected in series.

  Moreover, such a switch can also be arrange | positioned outside a board | substrate, for example. When the first light source and the second light source are LEDs, an expensive member with high thermal conductivity is often used for the substrate. Therefore, if the switch is disposed outside the substrate, an increase in the area of the substrate can be suppressed, and the manufacturing cost of the display device can be reduced. It is also possible to prevent light from the first light source and the second light source from being blocked by the switch.

  Moreover, according to the display device 10 according to the present embodiment, the light shielding member can be formed integrally with the reflection sheet. Therefore, the number of parts can be reduced. Furthermore, the light emitted from the first light source and the second light source can be efficiently applied to the first display area and the second display area.

  Further, according to the display device 10 according to the present embodiment, the transmission characteristics of the display panel in the second display area based on the pattern of the transmission characteristics for switching and displaying a plurality of images including at least one color image. Can be changed. Accordingly, the transmission characteristics of each of the plurality of pixels having a plurality of colors (for example, red, green, and blue) can be independently changed. Therefore, it is possible to more effectively suppress burn-in of the display panel than when the transmission characteristics of a plurality of pixels are uniformly changed as in the case of displaying a gray image.

(Embodiment 2)
Next, a second embodiment will be described. In the present embodiment, the configuration of the light source unit is different from that of the first embodiment. Specifically, in the present embodiment, the light source unit separately has an LED bar for irradiating the first display area and an LED bar for irradiating the second display area.

  Hereinafter, the display device according to the present embodiment will be described focusing on differences from the first embodiment.

  FIG. 8 is a front view showing the internal structure of the display device according to the second embodiment. As shown in FIG. 8, the display device 10A includes a rear frame 12, a reflection sheet 16, and a light source unit 20A. The light source unit 20A includes a first LED bar 21A and a second LED bar 25A.

  The first LED bar 21A is an LED bar for irradiating light to the first display area 13a. Each of the first LED bars 21A includes a long first substrate 22A and a first LED 23A. In the present embodiment, the first substrate 22A extends in the horizontal direction.

  The first LED 23A is an example of a first light source for irradiating light to the first display region 13a from the rear of the display panel 13. The first LED 23A is disposed on the first substrate 22A and irradiates light to the first display region 13a from the rear of the display panel 13.

  The second LED bar 25A is an LED bar for irradiating the second display area 13b with light. That is, the second LED bar 25A is an LED bar dedicated to the second display area 13b. Each of the second LED bars 25A includes a long second substrate 26A and a second LED 24A. In the present embodiment, the second substrate 26A extends in the vertical direction.

  The second LED 24A is an example of a second light source for irradiating light to the second display region 13b from the rear of the display panel 13. The second LED 24A is disposed on the second substrate 26A and irradiates the second display region 13b with light from behind the display panel 13.

  The second LED 24 </ b> A is turned off when an image having a second aspect ratio different from the first aspect ratio is displayed on the display panel 13. That is, when an image having a second aspect ratio different from the first aspect ratio is displayed on the display panel 13, power is not supplied to the second LED bar 25A.

  As described above, according to display device 10A according to the present embodiment, the first light source and the second light source can be arranged on different substrates (first substrate and second substrate). Therefore, the supply / non-supply of power for the burn-in prevention process can be switched for each substrate. That is, it is possible to simplify the wiring and control for the burn-in prevention process.

(Embodiment 3)
Next, Embodiment 3 will be described. In the present embodiment, the configuration of the light source unit is different from that of the first embodiment. Specifically, in the present embodiment, the light source unit is a dynamic backlight unit in which a plurality of LEDs are arranged in a matrix.

  Hereinafter, the display device according to the present embodiment will be described focusing on differences from the first embodiment.

  FIG. 9 is a front view showing the internal structure of the display device according to the third embodiment. As shown in FIG. 9, the display device 10B includes a rear frame 12, a reflection sheet 16, and a light source unit 20B. The light source unit 20B includes a plurality of LEDs (first LED 23B and second LED 24B) arranged in a matrix.

  The first LED 23B is an example of a first light source for irradiating light to the first display region 13a. The second LED 24B is an example of a second light source for irradiating the second display region 13b with light.

  The first LED 23B and the second LED 24B are controlled to be turned on and off in units of blocks including several LEDs, or in units of individual LEDs. Then, the second LED 24B is turned off when an image having a second aspect ratio different from the first aspect ratio is displayed on the display panel 13.

  As described above, in the display device 10B having the dynamic backlight unit as well, the display panel burn-in can be reduced while preventing the viewer from viewing the video, as in the first and second embodiments. it can.

(Embodiment 4)
Next, a fourth embodiment will be described. In the present embodiment, the arrangement of the first display area and the second display area, the arrangement of the first LED and the second LED, and the like are different from those of the first embodiment. Specifically, in the present embodiment, the second display area is displayed when an image having a second aspect ratio whose horizontal length ratio is larger than the first aspect ratio of the display panel is displayed. Is a display area where is not displayed. Specifically, for example, the first aspect ratio is 16: 9 and the second aspect ratio is 21: 9. Therefore, the first display area and the second display area are arranged side by side in the vertical direction.

  Hereinafter, the display device according to the present embodiment will be described focusing on differences from the first embodiment.

  FIG. 10 is a front view showing the internal structure of the display device according to the fourth embodiment. FIG. 11 is a cross-sectional view of the display device according to the fourth embodiment. Specifically, FIG. 11 is a cross-sectional view of the display device taken along line BB in FIG.

  As shown in FIGS. 10 and 11, the display device 10C includes a front cabinet 11, a rear frame 12, a display panel 13C, a reflection sheet 16, a light shielding member 17C, and a light source unit 20C.

  When a video having a second aspect ratio different from the first aspect ratio is displayed, the display panel 13C includes a first display area 13aC where the video is displayed and a second display area 13bC where the video is not displayed. Have. When a video having the first aspect ratio is displayed, the video is displayed over the first display area 13aC and the second display area 13bC.

  Here, a case where the first aspect ratio is 16: 9 and the second aspect ratio is 21: 9 is illustrated. In this case, the first display area 13aC and the second display area 13bC are arranged side by side in the vertical direction.

  The light shielding member 17C is disposed along the boundary between the first display area 13aC and the second display area 13bC. Then, the light shielding member 17C transmits light from the first space 18aC formed between the reflective sheet 16 and the first display region 13aC to the second space 18bC formed between the reflective sheet 16 and the second display region 13bC. Block. That is, the light shielding member 17C has a light shielding property, and divides the space formed between the reflection sheet 16 and the display panel 13C vertically.

  The light source unit 20C includes a first LED bar 21C and a second LED bar 25C.

  The first LED bar 21C is an LED bar for irradiating the first display area 13aC with light. Each of the first LED bars 21C includes a long first substrate 22C and a first LED 23C. In the present embodiment, the first substrate 22C extends in the horizontal direction.

  The first LED 23C is an example of a first light source for irradiating light to the first display region 13aC from behind the display panel 13C. The first LED 23C is disposed on the first substrate 22C, and irradiates the first display region 13aC with light from the back of the display panel 13C.

  The second LED bar 25C is an LED bar for irradiating the second display region 13bC with light. That is, the second LED bar 25C is an LED bar dedicated to the second display area 13bC. Each of the second LED bars 25C includes a long second substrate 26C and a second LED 24C. In the present embodiment, the second substrate 26C extends in the horizontal direction.

  The second LED 24C is an example of a second light source for irradiating light to the second display region 13bC from the rear of the display panel 13C. The second LED 24C is disposed on the second substrate 26C and irradiates the second display region 13bC with light from the back of the display panel 13C.

  The second LED 24C is turned off when an image having a second aspect ratio different from the first aspect ratio is displayed on the display panel 13C. That is, when an image having a second aspect ratio different from the first aspect ratio is displayed on the display panel 13C, power is not supplied to the second LED bar 25C.

  As described above, according to display device 10C according to the present embodiment, even in the case where the first display area and the second display area are arranged in the vertical direction, viewing is performed as in the first and second embodiments. It is possible to reduce the burn-in of the display panel while preventing the person from viewing the video.

(Other embodiments)
Although the display device according to the embodiment of the present invention has been described above, the present invention is not limited to this embodiment. Unless it deviates from the meaning of the present invention, forms in which various modifications conceived by those skilled in the art have been made in this embodiment and forms constructed by combining components in different embodiments are also included in the scope of the present invention.

  For example, the display device according to the first embodiment and the display device according to the fourth embodiment may be combined. That is, when the first display area and the second display area are aligned in the vertical direction as in the fourth embodiment, the display device includes an LED bar that includes the first LED and the second LED and extends in the vertical direction. May be. In this case, when an image having the second aspect ratio is displayed, power may be supplied to the first LED by bypassing the second LED.

  In each of the above embodiments, the light source is an LED, but is not limited thereto. For example, in the second and fourth embodiments, the light source may be CCFL (Cold Cathode Fluorescent Lamp).

  In each of the above embodiments, the light source unit is a direct type backlight, but may be an edge light type backlight. In this case, the light source unit may include a light guide plate.

  In each of the above embodiments, the light shielding member is formed integrally with the reflection sheet, but is not limited thereto. For example, the light shielding member may be a member made of a material different from that of the reflection sheet. That is, the light shielding member does not necessarily reflect light. In this case, the light shielding member may be bonded onto the reflection sheet. And the board | substrate of an LED bar may be arrange | positioned between a reflection sheet and the light shielding member. That is, the LED bar substrate may not penetrate the light shielding member.

  In each of the above embodiments, the light shielding member has a V shape, but it is not always necessary to have this shape. For example, the light shielding member may have an I shape. That is, the shape of the light shielding member may be any shape as long as light from the first space to the second space can be blocked.

  In each of the above embodiments, the case where the first aspect ratio of the display panel is 16: 9 has been described. However, the first aspect ratio may not be 16: 9. For example, the first aspect ratio may be 25: 9. For example, the first aspect ratio may be 4: 3.

  The display device according to one embodiment of the present invention can be used, for example, as a liquid crystal display, a liquid crystal television receiver, or the like.

10, 10A, 10B, 10C Display device 11 Front cabinet 12 Rear frame 13, 13C Display panel 13a, 13aC First display area 13b, 13bC Second display area 16 Reflective sheet 17, 17C Light shielding member 18a, 18aC First space 18b, 18bC second space 20, 20A, 20B, 20C light source unit 21 LED bar 21A, 21C first LED bar 22 substrate 22A, 22C first substrate 23, 23A, 23B, 23C first LED (first light source)
24, 24A, 24B, 24C Second LED (second light source)
25A, 25C 2nd LED bar 26A, 26C 2nd board | substrate 30 Control part 31 Drive source 32 Switch 32a 1st terminal 32b 2nd terminal 32c 3rd terminal 34a 1st path | route 34b 2nd path | route

Claims (6)

A display panel having a first aspect ratio, wherein when a video having a second aspect ratio different from the first aspect ratio is displayed, the first display area where the video is displayed and the video are not displayed A display panel having a second display area;
A light source unit including a first light source and a second light source for irradiating light to the first display area and the second display area from the rear of the display panel;
When an image having the second aspect ratio is displayed on the display panel, (i) the second light source is turned off, and (ii) the transmission characteristics of the display panel in the second display area are changed. A control unit;
A reflective sheet disposed behind the display panel and reflecting light from the light source unit;
A first space that is disposed along the boundary between the first display area and the second display area and is formed between the reflective sheet and the first display area, and between the reflective sheet and the second display area. And a light shielding member that blocks light to the second space formed in the display device. The light source unit further includes a long substrate disposed on the back side of the display panel,
The substrate is disposed across the light shielding member and across the first space and the second space,
The first light source is disposed on the first space side on the substrate,
The display device according to claim 1, wherein the second light source is disposed on the second space side on the substrate. The first light source and the second light source are electrically connected in series,
The display device further includes:
A switch that switches between a first path for supplying power to the first light source and the second light source and a second path for bypassing the second light source and supplying power to the first light source;
The display device according to claim 2, wherein the control unit turns off the second light source by switching the switch to the second path when an image having the second aspect ratio is displayed on the display panel. . The light source unit further includes:
A first substrate disposed in the first space;
A second substrate disposed in the second space,
The first light source is disposed on the first substrate;
The display device according to claim 1, wherein the second light source is disposed on the second substrate. The display device according to claim 1, wherein the light shielding member is formed integrally with the reflective sheet. The control unit, based on a pattern of transmission characteristics for switching and displaying a plurality of images including at least one color image when an image having the second aspect ratio is displayed on the display panel, The display device according to claim 1, wherein transmission characteristics of the display panel in the second display region are changed.

Images