Method of displaying image and display device

Abstract

To provide a method of displaying an image that can suppress heat generation of a display device.SOLUTION: A method of displaying an image that uses a display device is provided. The display device comprises: a light-transmissive decorative sheet; a liquid crystal monitor that is positioned on a back surface of the decorative sheet, and has a partial control function in which a backlight can individually control LEDs, the backlight being a plurality of direct-type LEDs; and an output unit that outputs image data to the liquid crystal monitor. The method of displaying an image comprises: (a) a step of outputting image data from the output unit to display an image on the liquid crystal monitor; and (b) a step of setting a display area of the liquid crystal monitor to black display to cool the LEDs after (a) step, the (a) step being performed again after the (b) step.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an image display method and display device. [Background technology]

[0002] Conventionally, decorative sheets have been known as decorative sheets for walls and the like, which include a base material and a printed layer provided on the surface of the base material, and the printed layer has a pattern such as a wood grain pattern or an abstract pattern. On the wall surface on which the decorative sheet is provided, the pattern is always visible. Meanwhile, decorative sheets are also known that have a light source provided on the back side of the decorative sheet, and can display a pattern different from the pattern of the printed layer when the light source is turned on.

[0003] For example, Patent Document 1 discloses a display panel having a specific decorative sheet and a support. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2022-167552 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in such conventional display devices, if the display device and the decorative sheet are located close to each other and LEDs are used for the backlight of the display device, the surface of the decorative sheet may heat up due to heat generated by the LEDs. If the decorative sheet becomes hot, there is a risk of low-temperature burns when touching the sheet, and a risk of the resin material that constitutes the display panel being deformed by heat.

[0006] The present disclosure provides an image display method capable of suppressing heat generation from LEDs of a backlight of a display device, and also provides a display device used in such an image display method. [Means for solving the problem]

[0007] In order to solve the above problems, the present disclosure provides the following image display method and display device. [1] A method for displaying an image using a display device, comprising: The display device comprises a light-transmitting decorative sheet, a liquid crystal monitor located on the rear surface of the decorative sheet, the liquid crystal monitor having a backlight of a direct-light type LED and a partial control function for controlling the LEDs individually, and an output unit for outputting image data to the liquid crystal monitor; The display method is as follows: (a) outputting image data from an output unit and displaying the image on a liquid crystal monitor; (b) after the step (a), a step of turning the display area of ​​the liquid crystal monitor to a black display and cooling the LED; Equipped with A method of displaying an image, in which step (a) is performed again after step (b). [2] The image display method according to [1], wherein in step (b), the LED is cooled until the surface temperature of the display area becomes the temperature before step (a) is performed. [3] The image is positioned directly above the LED; The image display method according to [1] or [2], wherein in the step (b), 80% or more of the display area of ​​the liquid crystal monitor is displayed in black, and the black display is arranged directly above the LED. [4] A light-transmitting decorative sheet; An LCD monitor located behind the decorative sheet, the backlight being a direct-light type of multiple LEDs, and the backlight having a partial control function that can control the LEDs individually; an output unit for outputting image data to a liquid crystal monitor; A display device comprising: Effect of the Invention

[0008] According to the present disclosure, there is provided an image display method capable of suppressing heat generation from LEDs of a backlight of a display device, and a display device used in such an image display method. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a cross-sectional view that shows a schematic state in which a display device is installed on a wall surface. [Diagram 2] FIG. 2 is a cross-sectional view that illustrates a schematic diagram of one embodiment of the configuration of the decorative sheet shown in FIG. [Diagram 3] Figures 3(a) and 3(b) are front views showing an example of the surface state of the display device shown in Figure 1, where Figure 3(a) shows the state when the screen located on the back side of the decorative sheet is displaying black, and Figure 3(b) shows the state when an image is displayed on the screen. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the drawings are schematic, and for example, the relationship between thickness and planar dimensions, and the ratio of thicknesses of each layer are different from the actual ones. In addition, the embodiments shown below are examples of configurations for embodying the technical idea of ​​the present disclosure, and the technical idea of ​​the present disclosure is not limited to the materials, shapes, structures, etc. of the components described below.

[0011] [Display device] A display device according to an embodiment of the present disclosure will be described below. FIG. 1 is a cross-sectional view that shows a schematic state in which a display device 100 according to this embodiment is installed on a wall surface W. The display device 100 includes a decorative sheet 20, a liquid crystal monitor 30, and an output unit (not shown). The liquid crystal monitor 30 is fixed to, for example, a wall surface W. The liquid crystal monitor 30 is located on the back side of the decorative sheet 20, that is, on the side of a concealing layer 3 described below. The liquid crystal monitor 30 includes a liquid crystal panel 32 and a backlight 35. The output unit outputs image data to the liquid crystal monitor. As a result, an image is displayed on the liquid crystal panel 32.

[0012] The display device 100 also includes a support 40 that supports the decorative sheet 20. The support 40 is made of a material (e.g., iron) that can ensure strength, and is fixed to the wall surface W by a jig (not shown). The support 40 has an opening (window) 42. The liquid crystal monitor 30 is disposed in the opening 42. A surface 30S of the liquid crystal monitor 30 and a surface 40S of the support 40 may be substantially on the same plane.

[0013] The display device 100 also includes a transparent support material 11 disposed between the decorative sheet 20 and the liquid crystal monitor 30. The transparent support material will be described in detail later.

[0014] Fig. 2 is a cross-sectional view showing a schematic configuration of the decorative sheet 20 shown in Fig. 1. As shown in Fig. 2, the decorative sheet 20, for example, has a printed layer 1 and a concealing layer 3 in this order from the outside to the inside, with the side on which the liquid crystal monitor 30 is present being the inside. The decorative sheet 20 may also have a transparent substrate 12 as shown in Fig. 2. An adhesive layer (not shown) for bonding the layers together may be provided between the layers.

[0015] The decorative sheet 20 has sufficient concealment properties to make the presence of the liquid crystal panel unnoticeable when no image is displayed on the liquid crystal panel 32. On the other hand, when an image is displayed on the liquid crystal panel 32, the decorative sheet 20 has light transparency to allow the image to be visually recognized.

[0016] FIG. 3(a) is a front view showing an example of the state of the surface of the display device 100, showing a state in which no image is displayed on the liquid crystal panel 32. The surface of the display device 100 has, for example, a wood grain pattern based on a dark brown color, and blends in with the surrounding wall surface, making it appear as if the liquid crystal monitor 30 does not exist. On the other hand, FIG. 3(b) is a front view showing an example of the state of the surface of the display device 100, showing a state in which an image of the liquid crystal panel 32 is projected onto the surface (surface F1) of the display device 100. For example, as shown in FIG. 3, information such as the date, time, and weather forecast is displayed on the surface of the display device 100.

[0017] When the backlight of a display device used to display an image is of the edge light type, the number of LEDs is small, and therefore the output of each LED is high. As a result, the display device generates heat, and the display device is prone to accumulating heat. On the other hand, the backlight 35 of the display device 100 is a direct type consisting of multiple LEDs. As a result, the output of each LED is suppressed, and the backlight of the display device 100 is less likely to rise in temperature.

[0018] The liquid crystal monitor will be described in detail below.

[0019] The liquid crystal monitor 30 includes a liquid crystal panel 32 and a backlight 35. The liquid crystal monitor 30 may include a display frame that surrounds the periphery of the liquid crystal panel 32.

[0020] The backlight 35 has a partial control function. The partial control function is a function that can control the LEDs individually. The partial control function turns off the LEDs or reduces the output when black is displayed. By providing the backlight 35 with this function, when white characters are displayed on a black screen in the liquid crystal panel 32, the LEDs corresponding to the area displaying the image can be turned on while turning off the LEDs corresponding to other areas or reducing the LED output. As a result, the display device can further suppress heat generation.

[0021] When the entire screen is displayed in black, the LED output is at its lowest, so it is easy to cool down through heat dissipation.

[0022] An example of the light-transmitting decorative sheet 20 will be described. The light-transmitting decorative sheet can have any configuration as long as it has light-transmitting properties and is a sheet that has the ability to conceal the presence of liquid crystal from its surroundings. Each layer will be described below.

[0023] (Printing layer) The printed layer 1 is a layer provided for the purpose of imparting design to the decorative sheet 20. The printed layer 1 can be formed on a transparent substrate (e.g., transparent substrate 12) by, for example, an inkjet method, a gravure printing method, a screen printing method, or an offset printing method.

[0024] The pattern of the printed layer 1 can be determined according to the environment of the installation location of the display device. Examples of the pattern of the printed layer 1 include a wood grain pattern, a stone pattern, and an abstract pattern.

[0025] The thickness of the printed layer 1 may be 0.5 μm or more, 1 μm or more, or 2 μm or more from the viewpoint of preventing the image of the printed layer 1 from appearing dark when no image is displayed on the liquid crystal panel 32. The thickness of the printed layer 1 may be 30 μm or less, 20 μm or less, or 15 μm or less from the viewpoint of improving the visibility of the image when an image is displayed on the liquid crystal panel 32.

[0026] (hidden layer) The concealing layer 3 is a layer that prevents the configuration of the inside (surface F2 side) of the decorative sheet 20 from being seen through. The color of the surface of the concealing layer 3 on the printing layer 1 side may be white from the viewpoint of preventing the pattern of the printing layer 1 from appearing dark when no image is displayed on the liquid crystal panel 32.

[0027] The concealing layer 3 has a plurality of through holes H. When an image is displayed on the liquid crystal panel 32, display light passes through the plurality of through holes H. This allows the image to be viewed through the decorative sheet 20. The visible light transmittance of the concealing layer 3 may be, for example, 10% or more and 70% or less.

[0028] The concealing layer 3 can be formed on the surface of the printed layer 1 by, for example, inkjet printing, gravure printing, screen printing, or offset printing. The concealing layer 3 is formed, for example, using a white ink containing titanium oxide.

[0029] The thickness of the concealing layer 3 may be 1 μm or more, 3 μm or more, or 5 μm or more from the viewpoint of preventing the pattern of the printed layer 1 from appearing dark when no image is displayed on the liquid crystal panel 32. The thickness of the concealing layer 3 may be 30 μm or less, 25 μm or less, or 20 μm or less from the viewpoint of improving the visibility of the image displayed by the liquid crystal monitor 30.

[0030] (Transparent base material 12) The transparent substrate 12 is a layer used as a substrate for forming the printed layer 1 and the concealing layer 3. The transparent substrate is disposed on the outer side (surface F1 side) of the decorative sheet 20 from the viewpoint of protecting the printed layer 1 and suppressing deterioration of the printed layer 1. In other words, as shown in Fig. 2, the decorative sheet 20 has the transparent substrate 12, the printed layer 1, and the concealing layer 3 laminated in this order from the outer side to the inner side, with the side on which the liquid crystal monitor 30 exists being the inner side.

[0031] The transparent substrate 12 has excellent visible light transmittance and is formed, for example, from a transparent resin. It is preferable that the transparent substrate 12 has scratch resistance and a UV-cut function. In addition, the surface of the transparent substrate 12 may be embossed or matte-treated, and may not have a glossy surface. The transparent substrate 12 may be formed from PET, acrylic, polycarbonate, nylon, polyethylene, polypropylene, or the like.

[0032] The thickness of the transparent substrate 12 may be 25 μm or more, 50 μm or more, or 75 μm or more from the viewpoint of providing sufficient strength to the decorative sheet 20. The thickness of the transparent substrate 12 may be 500 μm or less, 350 μm or less, or 250 μm or less from the viewpoint of preventing the decorative sheet 20 from becoming excessively thick.

[0033] (Transparent support material 11) The transparent support material 11 is a layer disposed between the decorative sheet 20 and the liquid crystal monitor 30, and is composed of a transparent base material 12, a printed layer 1, a concealing layer 3, and a transparent support material 11 disposed in this order. From the viewpoint of improving the visibility of the image displayed by the liquid crystal monitor 30, the transparent support material 11 may be disposed between the printed layer 1 and the concealing layer 3. The transparent support material 11 is formed of a transparent material, for example, acrylic, polycarbonate, glass, or PET.

[0034] The surface of the transparent support material 11 on the liquid crystal side may be flat, or may have projections and recesses formed thereon according to the shapes of the liquid crystal monitor 30 and / or the support material 40. For example, a projection may be formed on part of the surface of the transparent support material 11 on the support material 40 side so that the transparent support material 11 fits into the opening 42 of the support material 40.

[0035] The thickness of the transparent support material 11 may be 0.2 mm or more, 0.5 mm or more, or 1 mm or more from the viewpoint of providing better visibility of the image displayed by the liquid crystal monitor 30 and from the viewpoint of supporting with sufficient strength the decorative sheet 20. The thickness of the transparent support material 11 may be 10 mm or less, 8 mm or less, or 5 mm or less from the viewpoint of preventing the decorative sheet 20 from becoming excessively thick.

[0036] The output unit may be a storage medium on which images are stored, a set-top box (STB) that outputs video received via the Internet, or a personal computer.

[0037] [How to display images] Hereinafter, an image display method according to an embodiment of the present disclosure will be described. The display method according to this embodiment is a method for displaying an image using the display device 100, and includes the following steps (a) and (b). In the display method according to this embodiment, step (a) is performed again after step (b). Step (a): outputting image data from an output unit and displaying the image on a liquid crystal monitor 30 Step (b): After step (a), a step of turning the display area of ​​the liquid crystal monitor 30 into a black display and cooling the LEDs.

[0038] In step (a), it is preferable to display the image for a short period of time, as this helps prevent the LED temperature from rising. In step (b), the LED is displayed in black for the time it takes for the heat generated by the LED's light emission to cool. This prevents the LED temperature from rising over time. It is preferable to cool the LED until the surface temperature of the display area reaches the temperature before step (a) was performed. If there are LEDs that are not used in step (a), those LEDs may be lit without displaying the entire display area in black. In this case, however, those LEDs must be cooled in step (a).

[0039] The time for displaying the image in step (a) is preferably 10 seconds or less, but if sufficient cooling time is provided in step (b), there is no problem with a time of 10 seconds or more. Although it depends on the characteristics of the LED, since LEDs do not heat up suddenly, if step (a) is within 10 seconds, step (b) can cool the LED sufficiently in a short time.

[0040] When displaying white characters on a black screen, placing the characters directly above the backlight LEDs allows for more efficient use of the LEDs and increases the number of unused LEDs. Unused LEDs do not generate heat, which helps prevent the temperature of the LCD surface from rising.

[0041] In the step (b), the ratio of the region that is displayed in black is preferably 80% or more based on the area of ​​the display region, and it is more preferable that the entire display region is displayed in black in order to cool the LEDs. However, some LEDs may be lit as long as it does not cause any problems in terms of cooling.

[0042] Although the embodiments of the present disclosure have been described in detail above, the present disclosure is not limited to the above-described embodiments. EXAMPLES

[0043] Examples and comparative examples of the present disclosure will be described below. Note that the present disclosure is not limited to the following examples.

[0044] Since it depends on the characteristics of the LED of the backlight of the display device used, it is preferable that the image display time and the black display time are optimized according to the LED.

[0045] Example 1 A liquid crystal monitor was prepared that had a liquid crystal panel and a backlight, the backlight being a direct-type LED, and had a partial control function (LEDs were individually controlled and turned off when black was displayed). A decorative sheet was prepared that had a layered structure with a transparent substrate, a printing layer, and a concealing layer in that order. A computer was prepared as an output unit. The display device shown in Figure 1 was obtained from the liquid crystal monitor, the decorative sheet, the transparent support, and the output unit.

[0046] Using the obtained display device, image data was output from the output unit to display the entire display area of ​​the LCD monitor in white for 7 seconds. After that, image data was output from the output unit to display the entire display area of ​​the LCD monitor in black for 7 seconds. These operations were repeated continuously to measure the surface temperature of the decorative sheet over a day. At room temperature of 28°C, the surface temperature was a maximum of 28°C, and it was shown that the temperature rise of the LED was suppressed by cooling the LED in a timely manner by displaying black.

[0047] Comparative Example 1 A display device similar to that in Example 1 was used. Image data was output from the output unit, and the entire display area of ​​the liquid crystal monitor was continuously displayed in white throughout the day. The room temperature was the same as in Example 1. The surface temperature of the decorative sheet was measured over the course of a day. The maximum surface temperature was 34°C. It was confirmed that the LEDs were not cooled by the black display, and so the temperature of the LEDs rose, causing the surface temperature of the decorative sheet to increase.

[0048] Comparative Example 2 The surface temperature of the decorative sheet was measured in the same manner as in Comparative Example 1, except that an LCD monitor with an edge-lit backlight and no partial control function was used. Image data was output from the output unit, and the entire display area of ​​the LCD monitor was displayed in white continuously throughout the day. The room temperature was the same as in Example 1. The surface temperature of the decorative sheet was measured over the course of a day. The decorative sheet was hottest at the edge of the LCD where the LEDs were located, at 39°C. Edge-lit LEDs have a smaller number of LEDs, so the output per unit is higher, and they tend to become hotter than direct-light LEDs.

[0049] Comparative Example 3 The surface temperature of the decorative sheet was measured in the same manner as in Example 1, except that the same display device as in Comparative Example 2 was used. The room temperature was the same as in Example 1. The part of the decorative sheet at the edge of the liquid crystal where the LED was located was the hottest, at 39°C. Since the edge-lit LED does not have a partial control function, the LED was not cooled even when the black display was displayed, and the same result as when the black display was not displayed was shown.

[0050] Table 1 shows the backlight type, the presence or absence of a partial control function, the method of displaying image data, and the surface temperature of the decorative sheet for each of the examples and comparative examples.

[0051] [Table 1] [Explanation of symbols]

[0052] 1...printed layer, 3...concealing layer, 11...transparent support material, 20...decorative sheet, 30...liquid crystal monitor, 35...backlight, 100...display device.

Claims

1. A method for displaying an image using a display device, comprising: The display device comprises a light-transmitting decorative sheet, a liquid crystal monitor located on the rear surface of the decorative sheet, the liquid crystal monitor having a backlight of a direct-light type LED, the backlight having a partial control function capable of individually controlling the LEDs, and an output unit that outputs image data to the liquid crystal monitor; The display method is as follows: (a) outputting image data from the output unit and displaying an image on the liquid crystal monitor; (b) after the step (a), a step of displaying the display area of ​​the liquid crystal monitor in black and cooling the LED; Equipped with A method for displaying an image, comprising performing step (a) again after step (b).

2. 2. The method for displaying an image according to claim 1, wherein in the step (b), the LED is cooled until a surface temperature of the display area becomes a temperature before the step (a) is performed.

3. The image is positioned directly above the LED; 3. The image display method according to claim 1, wherein in the step (b), 80% or more of the display area of ​​the liquid crystal monitor is displayed in black.

4. A light-transmitting decorative sheet; a liquid crystal monitor located on the rear surface of the decorative sheet, the liquid crystal monitor having a backlight of a direct type LED, the backlight having a partial control function capable of individually controlling the LEDs; an output unit for outputting image data to the liquid crystal monitor; A display device comprising:

Images