Display device capable of folding at least once and method for controlling same

Abstract

A method for controlling a display device capable of folding at least once, according to one embodiment of the present invention, comprises the steps of: outputting video data in a full view mode in which the display device is not folded; receiving at least one folding-related command; and controlling whether to invert the video data for each layer in which a partial area of a screen of the display device is located, depending on the number of folding times of the command.

Description

A display device capable of being folded at least once and a method for controlling the same

[0001] Embodiments of the present invention are applicable to various display devices (e.g., TVs, mobile phones, signage, etc.) capable of being folded at least once. While particularly applicable to flexible OLEDs (Organic Light Emitting Diodes), the present invention is not necessarily limited thereto.

[0002] Flexible displays are currently dominated by flexible OLED technology. First, an example that embodies the most fundamental characteristic is the unbreakable display. Because flexible OLEDs do not use glass as a substrate, they are, in principle, unbreakable.

[0003] Also, if you gently bend the display, you get a curved display, and if you slightly bend only both ends, you get a bent display.

[0004] And there are foldable displays that can be folded like a wallet. Furthermore, technology that applies transparent OLED to foldable displays is being discussed.

[0005] Transparent displays are advantageous for implementing OLEDs, as their pixels emit light themselves, compared to non-luminous LCDs. Because OLEDs emit light themselves, they eliminate the need for external light sources like backlight units (BLUs), and because they allow more light to pass through than LCDs, they can reveal objects on the back of the display.

[0006] However, when applying transparent OLED to foldable displays, there is no research on technology to provide various GUIs for each folded layer.

[0007] According to one embodiment of the present invention, when implementing a transparent display in a folding manner, it is intended to solve the problem of an image being reversed depending on the folded section.

[0008] According to one embodiment of the present invention, it is intended to provide a UX / UI technology that allows a user to experience a three-dimensional image for each folded layer.

[0009] A control method for a display device capable of being folded at least once according to any one of the embodiments of the present invention includes the steps of outputting video data in a full view mode in which the display device is not folded, receiving at least one folding-related command, and controlling whether to invert the video data for each layer in which a portion of a screen of the display device is located, depending on the number of folding times of the command.

[0010] A flexible OLED display device capable of being folded at least once according to any one of the embodiments of the present invention includes a screen that outputs video data in a full view mode in which the screen is not folded, an interface that receives at least one folding-related command, and a controller that controls whether to invert the video data for each layer in which a portion of the screen is located, depending on the number of folding times of the command.

[0011] It is also within the scope of the present invention for a third party to implement a computer-readable medium (e.g., an application, memory, software, etc.) recording a program for performing any of the above-described methods and various embodiments described in the specification.

[0012] According to one of the embodiments of the present invention, when implementing a transparent display in a folding manner, the technical problem of the image being reversed depending on the folded section can be solved.

[0013] According to one embodiment of the present invention, there is an advantage of providing a UX / UI technology that allows a user to experience a three-dimensional image for each folded layer.

[0014] In addition to the technical effects described above, it is self-evident that effects that can be inferred by a person skilled in the art from the entire specification should also be taken into consideration.

[0015] FIG. 1 is a plan view of a color filter according to one of the embodiments of the present invention.

[0016] FIG. 2 is a cross-sectional view of a color filter according to one of the embodiments of the present invention.

[0017] FIG. 3 is a side view of a display device according to one embodiment of the present invention.

[0018] FIG. 4 is a drawing for explaining a process in which a display device according to one of the embodiments of the present invention operates in full view mode.

[0019] FIG. 5 is a drawing for explaining a process in which a display device according to one of the embodiments of the present invention operates in a first partial view mode.

[0020] FIG. 6 is a drawing for explaining a process in which a display device according to one of the embodiments of the present invention operates in a second partial view mode.

[0021] FIG. 7 is a drawing for explaining a process in which a display device according to one of the embodiments of the present invention operates in a third partial view mode.

[0022] FIG. 8 is a drawing for explaining the proportion of the area in which video data is inverted and the transparent area for each layer in the first partial view mode illustrated in FIG. 5.

[0023] FIG. 9 is a drawing for explaining the proportion of the area in which video data is inverted and the transparent area for each layer in the second partial view mode illustrated in FIG. 6.

[0024] FIG. 10 illustrates a UX / UI embodiment when playing a music video in the second partial view mode illustrated in FIG. 9.

[0025] FIG. 11 illustrates a UX / UI embodiment when executing a calendar function in the second partial view mode illustrated in FIG. 9.

[0026] FIG. 12 illustrates a UX / UI embodiment when the screen saver function is executed in the second partial view mode illustrated in FIG. 9.

[0027] FIG. 13 is a flow chart illustrating a method for controlling a display device according to one of the embodiments of the present invention.

[0028] And, FIG. 14 is a block diagram showing the main components of a display device according to one of the embodiments of the present invention.

[0029] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Regardless of the drawing numbers, identical or similar components will be assigned the same reference numbers, and redundant descriptions thereof will be omitted. The suffixes "module" and "part" used for components in the following description are assigned or used interchangeably solely for the convenience of writing the specification, and do not in themselves have distinct meanings or roles.

[0030] In addition, when describing the embodiments disclosed in this specification, if it is determined that a detailed description of a related known technology may obscure the gist of the embodiments disclosed in this specification, the detailed description thereof will be omitted. In addition, the attached drawings are only intended to facilitate easy understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, and substitutes included within the spirit and technical scope of the present invention.

[0031] Terms that include ordinal numbers, such as "first," "second," etc., may be used to describe various components, but these components are not limited by these terms. These terms are used solely to distinguish one component from another. When a component is referred to as being "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components present in between.

[0032] On the other hand, when it is said that a component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

[0033] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0034] In this application, terms such as “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but should be understood not to exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0035] Fig. 1 is a plan view of a color filter according to one of the embodiments of the present invention. Fig. 2 is a cross-sectional view of a color filter according to one of the embodiments of the present invention.

[0036] As illustrated in FIGS. 1 and 2, a color filter (100) according to one embodiment of the present invention is composed of a transparent substrate (110) and a plurality of unit pixels (P) formed on the transparent substrate (110) to filter light.

[0037] At this time, the transparent substrate (110) is made of a transparent material with sufficient strength and support to ensure the stability of the color filter (100). For example, glass with excellent chemical stability and high strength may be used.

[0038] A unit pixel (P) is a basic unit that implements color by selectively filtering only light of a specific wavelength from white light. A unit pixel (P) is composed of three primary colors of light: a red pixel, a green pixel, and a blue pixel. The unit pixels (P) are arranged in multiple rows on a transparent substrate (110), for example, in a rectangular shape.

[0039] The red pixel (R), green pixel (G), and blue pixel (B) of the present invention have a structure in which a transparent portion (130) is formed between a plurality of color portions (120) that selectively transmit only light of red, green, or blue wavelengths, and the color portions (120) and transparent portions (130) are arranged alternately.

[0040] The color portion (120) selectively transmits only light of red, green, or blue wavelengths. That is, the red pixel (R) includes a color portion (120a) that transmits only light of red wavelengths, the green pixel (G) includes a color portion (120b) that transmits only light of green wavelengths, and the blue pixel (B) includes a color portion (120c) that transmits only light of blue wavelengths. The color portion (120) may be formed of a polymer material such as a color resin.

[0041] The transparent portion (130) transmits all incident light. The color portion (120) has a light transmittance of 10% to 30%. Therefore, if the color filter (100) is composed of only the color portion (120), the light transmittance is low, and the color filter (100) may be visible from the outside of the display device. Therefore, by including the transparent portion (130) having a light transmittance of 100%, the average light transmittance of the color filter (100) can be increased to 40% or more.

[0042] FIG. 3 is a side view of a display device according to one embodiment of the present invention. The color filter (100) described in FIGS. 1 and 2 may be included in the display device illustrated in FIG. 3.

[0043] A display device according to one embodiment of the present invention is designed to have a structure in which the screen can be folded at least once, for example, using a flexible OLED.

[0044] First, as illustrated in FIG. 3, when the display device according to one embodiment of the present invention operates in full view mode, the screen (310) is fully exposed outside the housing (300). The full view mode defined in this specification will be described in more detail later in FIG. 4 and elsewhere.

[0045] On the other hand, when the display device according to one embodiment of the present invention operates in various partial view modes, the screen (311) is folded and divided into a plurality of layers, and has a structure in which a portion of the screen (311) is inserted into the housing (301). The partial view mode defined in the specification will be described in more detail later with reference to FIGS. 5, 6, and 7.

[0046] FIG. 4 is a drawing for explaining a process in which a display device according to one of the embodiments of the present invention operates in full view mode.

[0047] As illustrated in FIG. 4, when the display device according to one embodiment of the present invention operates in full view mode, the screen (410) is entirely exposed outside the housing (400) and is configured as one layer.

[0048] In addition, the screen (411) is designed not to be folded at all in full view mode. Therefore, there is no need to perform up / down / left / right inversion on the video data output through each pixel in the screen (410, 411).

[0049] FIG. 5 is a drawing for explaining a process in which a display device according to one of the embodiments of the present invention operates in a first partial view mode.

[0050] As illustrated in FIG. 5, when the display device according to one embodiment of the present invention operates in the first partial view mode, a portion of the screen (510) is exposed in a folded state outside the housing (500) and is composed of two layers.

[0051] In addition, in the first partial view mode, the screen (511) is designed to be folded only once. Therefore, it must be designed to perform up / down / left / right inversion on the video data output through the pixels in the second layer (520) within the screen (510). If it is not designed in this way, a problem occurs in which the user in the front cannot properly recognize the video data output from the folded second layer (520).

[0052] FIG. 6 is a drawing for explaining a process in which a display device according to one of the embodiments of the present invention operates in a second partial view mode.

[0053] As illustrated in FIG. 6, when the display device according to one embodiment of the present invention operates in the second partial view mode, a portion of the screen (610) is exposed in a folded state outside the housing (600) and is composed of three layers.

[0054] In addition, in the second partial view mode, the screen (611) is designed to fold only twice. Therefore, it must be designed to perform up / down / left / right inversion on the video data output through the pixels in the second layer (520) within the screen (610). If it is not designed in this way, a problem occurs in which the user in the front cannot properly recognize the video data output from the folded second layer (620).

[0055] However, for video data output through pixels in the third layer (630) within the screen (610), there is no need to perform up / down / left / right reversal.

[0056] FIG. 7 is a drawing for explaining a process in which a display device according to one of the embodiments of the present invention operates in a third partial view mode.

[0057] As illustrated in FIG. 7, when the display device according to one embodiment of the present invention operates in the third partial view mode, a portion of the screen (710) is exposed in a folded state outside the housing (700) and is composed of four layers.

[0058] In addition, in the third partial view mode, the screen (711) is designed to be folded only three times. Therefore, the video data output through the pixels in the second layer (720) and the fourth layer (730) within the screen (710) must be designed to be flipped up / down / left / right.

[0059] If it is not designed in this way, a problem occurs in which the user at the front cannot properly recognize the video data output from the folded second layer (720) and fourth layer (730).

[0060] However, for video data output through pixels in the first layer and the third layer in the screen (710), there is a technical effect that allows a user located in the front to normally recognize the video data by not performing up / down / left / right inversion.

[0061] FIG. 8 is a drawing for explaining the proportion of the area in which video data is inverted and the transparent area for each layer in the first partial view mode illustrated in FIG. 5.

[0062] Meanwhile, in Fig. 8, WOLED (White OLED) is described as an example, but the present invention can be applied to RGB OLED, LCD, etc., as long as the product is capable of a flexible transparent display. WOLED has the advantage of a particularly excellent contrast ratio because it does not have the light leakage phenomenon that occurs in LCDs by emitting light on its own through OLED materials without the help of a BLU (Backlight Unit).

[0063] As described in the previous drawing 5, the flexible transparent display device illustrated in drawing 8 has a screen (810) folded once and exposed outside the housing (800).

[0064] Therefore, a technology is required to differently control the first layer (811) located at the front and the second layer (812) located at the back.

[0065] First, it is assumed that a flexible transparent display device according to an embodiment of the present invention receives a folding-related command, and that the received command corresponds to a first partial view mode (folding only once).

[0066] At this time, the flexible transparent display device according to one embodiment of the present invention does not perform inversion of video data in the first layer (the folding 1 layer section illustrated in FIG. 8).

[0067] On the other hand, a flexible transparent display device according to an embodiment of the present invention performs inversion of video data in the second layer (the folding 2-layer section illustrated in FIG. 8), thereby enabling a user positioned at the front to normally recognize both the video of the first layer and the video of the second layer.

[0068] Furthermore, another technical feature of the present invention is that the transparent area where pixels do not emit light and the opaque area where pixels emit light are both set to 50% for each layer. In addition, the positions of the transparent area of ​​the first layer and the opaque area of ​​the second layer are designed to correspond in the vertical direction.

[0069] In addition, when setting the transparent area for each layer to 50%, there is a technical effect that can reduce the possibility of error by designing the screen (810) excluding the folded area.

[0070] FIG. 9 is a drawing for explaining the proportion of the area in which video data is inverted and the transparent area for each layer in the second partial view mode illustrated in FIG. 6.

[0071] First, it is assumed that a flexible transparent display device according to an embodiment of the present invention receives a folding-related command, and that the received command corresponds to a second partial view mode (folding only twice).

[0072] At this time, the flexible transparent display device according to one embodiment of the present invention is designed not to perform inversion of video data in the first layer (the folding 1 layer section shown in FIG. 8) and the third layer (the folding 3 layer section shown in FIG. 8).

[0073] On the other hand, the flexible transparent display device according to one embodiment of the present invention performs inversion of video data only in the second layer (the folding 2-layer section illustrated in FIG. 8), thereby enabling a user positioned at the front to normally recognize the videos of the first layer, the second layer, and the third layer.

[0074] Furthermore, another technical feature of the present invention is that the transparent area where pixels do not emit light is set to 66% for each layer. Furthermore, the positions of the transparent area of ​​the first layer and the opaque areas of the second and third layers are designed to correspond vertically.

[0075] Therefore, by designing as above, it is expected that a technical effect will be achieved in which, from the user's perspective located at the front, it is possible to simultaneously check video data output from a portion of the first layer, video data output from a portion of the second layer, and video data output from a portion of the third layer.

[0076] And, as mentioned above, when setting the transparent area for each layer to 66%, there is a technical effect that can reduce the possibility of error by designing the screen (910) excluding the folded area. Although not illustrated in Fig. 9, folding is also performed once inside the housing (900).

[0077] As described above, the flexible transparent display device according to one embodiment of the present invention can provide various services through multiple layers.

[0078] For example, when playing music, it is possible to implement and output different screen configurations (e.g., album, playback time, Visual EQ, video image, etc.) for each layer.

[0079] For example, when displaying time information, it is possible to implement a layout where the number of hours / minutes / seconds are displayed and then disappear for each layer.

[0080] For example, when displaying a picture frame GUI, by controlling each layer, it is possible to move a photo back and forth or output a specific photo in three dimensions.

[0081] For example, when displaying a weather GUI, it is possible to control each layer to give the impression of rain falling in three dimensions.

[0082] For example, when outputting video content such as movies or dramas, it is possible to separate and arrange backgrounds and characters by layer.

[0083] For example, in screen saver mode, it is possible to control each layer so that the circles appear to move back and forth.

[0084] For example, it is possible to control each layer to display a company logo (e.g., the LG mark) in three dimensions in response to a power on command for the display device.

[0085] For example, it is possible to individually control each layer, such as playing video content on the front layer and using the back layer as a separate touch pad.

[0086] Some of the related embodiments will be described in more detail below with reference to FIGS. 10 to 12.

[0087] FIG. 10 illustrates a UX / UI embodiment when playing a music video in the second partial view mode illustrated in FIG. 9.

[0088] As illustrated in FIG. 10, when folding is performed twice, once from the outside and once from the inside, the screen of the flexible transparent display device is designed to be separated and controlled into a first layer (1010), a second layer (1020), and a third layer (1030).

[0089] The lower 66% of the first layer (1010) is treated as a transparent area, while the upper 33%, the opaque area (1011), controls pixels normally and displays, for example, album images.

[0090] On the other hand, the upper 66% of the second layer (1020) is treated as a transparent area, while the lower 33% of the opaque area (1021) controls the up-down, left-right reversal of video data for pixels, thereby displaying, for example, a music video of a specific song (e.g., a music video included in an album as shown in No. 1011 of FIG. 10).

[0091] Finally, the lower 66% of the third layer (1030) is treated as a transparent area, while the upper 33%, the opaque area (1031), controls pixels normally and displays, for example, the current playing time of a specific song (e.g., corresponding to the music video shown at number 1021 in FIG. 10).

[0092] FIG. 11 illustrates a UX / UI embodiment when executing a calendar function in the second partial view mode illustrated in FIG. 9.

[0093] As illustrated in Fig. 11, when folding is performed twice, once from the outside and once from the inside, the screen of the flexible transparent display device is designed to be separated and controlled into a first layer (1110), a second layer (1120), and a third layer (1130).

[0094] The lower 66% of the first layer (1110) is treated as a transparent area, while the upper 33%, the opaque area (1111), controls pixels normally and displays, for example, the current date.

[0095] On the other hand, the upper 66% of the second layer (1120) is treated as a transparent area, while the lower 33%, the opaque area (1121), controls the up / down / left / right reversal of video data for pixels, thereby displaying, for example, a specific anniversary that is closest to the current date (1111).

[0096] Finally, the lower 66% of the third layer (1130) is treated as a transparent area, while the upper 33%, the opaque area (1131), controls pixels normally and displays, for example, the difference between the current date (1111) and a specific anniversary (1121) (ex: D-30).

[0097] FIG. 12 illustrates a UX / UI embodiment when the screen saver function is executed in the second partial view mode illustrated in FIG. 9.

[0098] As shown in Fig. 12, when folding is performed twice, once from the outside and once from the inside, the screen of the flexible transparent display device is designed to be separated and controlled into a first layer (1210), a second layer (1220), and a third layer (1230).

[0099] The lower 66% of the first layer (1210) is treated as a transparent area, while the upper 33%, the opaque area (1211), controls the pixels normally and displays, for example, a portion of rain falling in a downward direction together with an image of the sky.

[0100] On the other hand, the upper 66% of the second layer (1220) is treated as a transparent area, while the lower 33%, the opaque area (1221), controls the up-down, left-right inversion of video data for pixels, thereby displaying, for example, only a portion of rain. Here, if the inversion process is not performed as in the present invention, there is a problem in that an error occurs in which rain rises upward.

[0101] Finally, the lower 66% of the third layer (1230) is treated as a transparent area, while the upper 33%, the opaque area (1231), controls pixels normally and displays, for example, an image of rain and an image of the ground together.

[0102] Figure 13 is a flowchart illustrating a method for controlling a display device according to one embodiment of the present invention. Those skilled in the art may further interpret Figure 13 with reference to Figures 1 to 12, etc., previously described.

[0103] According to one embodiment of the present invention, a display device capable of being folded at least once (e.g., using a flexible OLED) outputs video data in a full view mode in which the display is not folded (S1310). In this regard, reference may be made to the previous FIG. 4.

[0104] According to one embodiment of the present invention, a display device capable of folding at least once receives at least one folding-related command (S1320).

[0105] And, according to one embodiment of the present invention, a display device capable of being folded at least once controls whether to invert the video data for each layer in which a part of the screen of the display device is located, depending on the number of folding times of the command.

[0106] Furthermore, the transparent area located in the first layer is designed to correspond vertically to the opaque area of ​​the remaining layers, or the opaque area of ​​the remaining layers is designed to be vertically included in the opaque area located in the first layer. This has been sufficiently explained in the previous drawings 9 to 12.

[0107] At least one of the folding-related commands described above corresponds to, for example, one of the first partial view mode, the second partial view mode, or the third partial view mode.

[0108] If at least one of the above folding-related commands corresponds to the first partial view mode, the display device according to one embodiment of the present invention inverts a specific layer only once (S1330). That is, the section for inverting video data is set to one (e.g., the second layer (520) illustrated in FIG. 5).

[0109] And, in the second layer, the interval for inversion of video data is characterized by being set to, for example, at least 50%.

[0110] If at least one of the above folding-related commands corresponds to the second partial view mode, the display device according to one embodiment of the present invention inverts a specific layer only once (S1340). That is, the section for inverting video data is set to one (e.g., the second layer (620) illustrated in FIG. 6).

[0111] And, in the second layer, the interval for inversion of video data is characterized by being set to, for example, at least 66%.

[0112] If at least one of the above folding-related commands corresponds to the third partial view mode, the display device according to one embodiment of the present invention inverts a specific layer only twice (S1350). That is, the sections for inverting video data are set to two (e.g., the second layer (720) and the fourth layer (730) illustrated in FIG. 7).

[0113] Furthermore, in the third layer, the interval for inversion of video data is characterized in that it is set to, for example, at least 75%.

[0114] And, Fig. 14 is a block diagram illustrating the main components of a display device according to one of the embodiments of the present invention. Meanwhile, the display device (1400) illustrated in Fig. 14 can be implemented as, for example, a flexible OLED capable of being folded at least once.

[0115] A display device (1400) according to one embodiment of the present invention includes a screen (1410) that outputs video data in a full view mode that is not folded, an interface (1420) that receives at least one folding-related command, and a controller (1440) that controls whether to invert the video data for each layer in which a portion of the screen is located, depending on the number of folding times of the command.

[0116] Furthermore, the controller (1440) refers to the memory (1430) to determine whether to invert video data for each layer. To implement this, for example, data as shown in Table 1 below is stored in the memory (1430).

[0117] View modeFolding countInversion controlFull view modeN / ANot necessaryFirst partial view mode1st layerOnlySecond partial view mode2nd layerOnlyThird partial view mode3rd layer2 and 4th layer

[0118] The present invention described above can be implemented as computer-readable code on a medium having a program recorded thereon. Computer-readable media include all types of recording devices that store data that can be read by a computer system. Examples of computer-readable media include applications, hard disk drives (HDDs), solid-state disks (SSDs), silicon disk drives (SDDs), ROMs, RAMs, CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, and the like, and also include media implemented in the form of carrier waves (e.g., transmission via the Internet).

[0119] Although the data processing device and method according to the embodiments of the present invention have been described in specific embodiments, these are merely examples, and the present invention is not limited thereto, and should be construed to have the broadest scope in accordance with the basic idea disclosed in this specification. Those skilled in the art may implement embodiments not specified by combining or replacing the disclosed embodiments, but this also does not exceed the scope of the present invention. In addition, those skilled in the art may easily modify or alter the disclosed embodiments based on this specification, and it is clear that such modifications or alterations also fall within the scope of the present invention.

[0120] Various forms (embodiments) for carrying out the present invention have been sufficiently described in the previous table of contents.

[0121] The present invention is applicable to all products of flexible transparent displays, such as TVs, and thus its industrial applicability is recognized.

Claims

1. A method for controlling a display device capable of folding at least once, Step of outputting video data in full view mode without folding; A step of receiving at least one folding-related command; and A step of controlling whether to invert the video data by layer in which a part of the screen of the display device is located, depending on the number of foldings of the above command. A control method for a display device capable of being folded at least once, characterized by including:

2. In paragraph 1, A control method for a display device capable of folding at least once, characterized in that the vertical positions of a transparent area located in a first layer and an opaque area of ​​the remaining layers correspond.

3. In paragraph 1, A control method for a display device capable of being folded at least once, characterized in that the opaque areas of the remaining layers are all vertically included in the transparent area located in the first layer.

4. In paragraph 1, A control method for a display device capable of folding at least once, characterized in that the at least one folding-related command corresponds to any one of the first partial view mode, the second partial view mode, or the third partial view mode.

5. In paragraph 4, If at least one of the above folding-related commands corresponds to the first partial view mode, A control method for a display device capable of folding at least once, characterized in that the section for reversing the above video data is set to one.

6. In paragraph 5, The section for inversion of the above video data is: A control method for a display device capable of folding at least once, characterized in that the screen is set to at least 50% of the screen.

7. In paragraph 4, If at least one of the above folding-related commands corresponds to the second partial view mode, A control method for a display device capable of folding at least once, characterized in that the section for reversing the above video data is set to one.

8. In paragraph 7, The section for inversion of the above video data is: A control method for a display device capable of folding at least once, characterized in that the screen is set to at least 66% of the above screen.

9. In paragraph 4, If at least one of the above folding-related commands corresponds to the third partial view mode, A control method for a display device capable of folding at least once, characterized in that the section for reversing the above video data is set to two.

10. In paragraph 9, The section for inversion of the above video data is: A control method for a display device capable of folding at least once, characterized in that the screen is set to at least 75% of the screen.

11. In a flexible OLED display device capable of being folded at least once, A screen that outputs video data in full view mode without folding; An interface that receives at least one folding-related command; and A controller that controls whether to invert the video data by layer in which a portion of the screen is located, depending on the number of foldings of the above command. A flexible OLED display device capable of being folded at least once, characterized by including:

12. In paragraph 11, A flexible OLED display device capable of being folded at least once, characterized in that the vertical positions of the transparent area located in the first layer and the opaque areas of the remaining layers correspond.

13. In paragraph 11, A flexible OLED display device capable of being folded at least once, characterized in that the opaque areas of the remaining layers are all vertically included in the opaque area located in the first layer.

14. In paragraph 11, A flexible OLED display device capable of being folded at least once, characterized in that the at least one folding-related command corresponds to any one of a first partial view mode, a second partial view mode, or a third partial view mode.

15. In paragraph 14, If at least one of the above folding-related commands corresponds to the first partial view mode, The above controller, A flexible OLED display device capable of being folded at least once, characterized in that the section for reversing the above video data is set to one.

16. In paragraph 15, The section for inversion of the above video data is: A flexible OLED display device capable of being folded at least once, characterized in that the screen is set to at least 50% of the above screen.

17. In paragraph 14, If at least one of the above folding-related commands corresponds to the second partial view mode, The above controller, A flexible OLED display device capable of being folded at least once, characterized in that the section for reversing the above video data is set to one.

18. In paragraph 17, The section for inversion of the above video data is: A flexible OLED display device capable of being folded at least once, characterized in that the screen is set to at least 66% of the above screen.

19. In paragraph 14, If at least one of the above folding-related commands corresponds to the third partial view mode, The above controller, A flexible OLED display device capable of being folded at least once, characterized in that the section for reversing the above video data is set to two.

20. In paragraph 19, The section for inversion of the above video data is: A flexible OLED display device capable of being folded at least once, characterized in that the screen is set to at least 75% of the above screen.

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