Wireless transmission device and wireless display system

Abstract

A wireless transmission device according to an embodiment disclosed herein may comprise: a compression chip for compressing image data; a radio frequency (RF) transmission interface for wirelessly transmitting the compressed image data to a wireless reception device; and a processor for acquiring the light-shielding state of a display which is provided in the wireless reception device, and adjusting the compression rate of the image data on the basis of the acquired light-shielding state.

Description

Wireless transmission device and wireless display system

[0001] The present disclosure relates to a wireless display system that wirelessly transmits and receives A / V data.

[0002] Digital TV services utilizing wired or wireless networks are becoming more widespread. Digital TV services can offer a variety of services not available with existing analog broadcasting services.

[0003] For example, IPTV (Internet Protocol Television), a type of digital TV service, and smart TV services offer interactivity, allowing users to actively choose the type of program they want to watch and when. Building on this interactivity, IPTV and smart TV services can also offer a variety of additional services, such as internet search, home shopping, and online games.

[0004] Recently, TV services have been provided through wireless display systems in which a wireless transmission device transmits a compressed A / V (Audio / Video) signal to a wireless receiving device via a wireless connection, and the wireless receiving device restores and outputs the compressed A / V signal.

[0005] In conventional wireless display systems, image data is compressed and transmitted equally regardless of the shading status of the display equipped in the wireless receiving device or the ambient brightness.

[0006] Accordingly, there is a need to reduce power consumption and improve wireless quality.

[0007] The purpose of the present disclosure may be to reduce power consumption and improve wireless communication quality by changing the compression ratio of image data transmitted wirelessly according to the shading state of a display provided in a wireless display system.

[0008] The purpose of the present disclosure may be to reduce power consumption and improve wireless communication quality by changing the compression ratio of image data transmitted wirelessly according to the degree of shading of a display provided in a wireless display system.

[0009] The purpose of the present disclosure may be to reduce power consumption and improve wireless communication quality by changing the compression rate of transmitted image data by considering the shading state of a display equipped in a wireless display system and the ambient brightness.

[0010] A wireless transmission device according to an embodiment of the present disclosure may include a compression chip that compresses image data, an RF (Radio Frequency) transmission interface that wirelessly transmits the compressed image data to a wireless receiving device, and a processor that obtains a shading state of a display provided in the wireless receiving device and adjusts a compression ratio of the image data based on the obtained shading state.

[0011] In a wireless display system including a wireless transmission device and a wireless reception device according to an embodiment of the present disclosure, the wireless transmission device wirelessly transmits compressed image data to a wireless reception device, acquires a light-blocking state of a display provided in the wireless reception device, and adjusts a compression ratio of the image data based on the acquired light-blocking state, the wireless reception device restores the compressed image data received from the wireless transmission device, and displays an image based on the restored image data on the display, and the wireless reception device includes a light-blocking film disposed on one surface of the display, and the light-blocking film can shade the entire area or a portion of the display using any one of a non-electronic light-blocking method and an electronic light-blocking method.

[0012] According to an embodiment of the present disclosure, when the shade film shades the entire area of ​​the display, the wireless transmission device lowers the compression rate of image data, thereby enabling the viewer to view high-quality images.

[0013] Additionally, according to an embodiment of the present disclosure, when the shade does not shade the entire area of ​​the display, the wireless transmission device can increase the compression rate of image data to lower the power consumption of the wireless display system and appropriately respond to a wireless connection failure environment.

[0014] According to an embodiment of the present disclosure, when a content image is displayed in a shaded area, the image quality can be improved by lowering the compression rate of the image data, and when an information image is displayed in the shaded area, the wireless transmission quality can be improved by increasing the compression rate of the image data.

[0015] In addition, according to an embodiment of the present disclosure, the image quality can be improved by lowering the compression ratio of the image corresponding to the shaded area, and the wireless transmission quality can be improved by increasing the compression ratio of the image corresponding to the non-shaded area.

[0016] According to embodiments of the present disclosure, the compression rate of image data can be adjusted based on the transparency of the area formed by the display. This reduces unnecessary power consumption and enables efficient data transmission even in wirelessly obstructed environments.

[0017] According to an embodiment of the present disclosure, the compression ratio can be adjusted based on the shading status of the display and the motion value of the image displayed on the shading area. Accordingly, the number of unnecessarily used receiving antennas can be reduced, thereby reducing power consumption.

[0018] FIGS. 1 and 2 are drawings explaining the configuration of a display system according to one embodiment of the present disclosure.

[0019] FIG. 3 is a block diagram illustrating the configuration of a remote control device according to one embodiment of the present disclosure.

[0020] Figure 4a is a perspective view of a wireless transmission device.

[0021] Figure 4b is a drawing explaining the internal structure of a wireless transmission device.

[0022] Figure 4c is a drawing illustrating an RF receiving interface of a wireless receiving device.

[0023] FIGS. 5A to 5C are drawings explaining a shading state according to an embodiment of the present disclosure.

[0024] FIG. 6a and FIG. 6b are drawings explaining a non-electronic shading method according to one embodiment of the present disclosure, and FIG. 6c is a drawing explaining an electronic shading method according to another embodiment of the present disclosure.

[0025] FIGS. 7A and 7B are drawings illustrating various forms of a display according to an embodiment of the present disclosure.

[0026] FIG. 8 is a sequence diagram for explaining an operation method of a wireless display system according to an embodiment of the present disclosure.

[0027] FIGS. 9A to 9C are drawings explaining a method for controlling the compression ratio of image data according to the operation of a non-electronic shading method according to one embodiment of the present disclosure.

[0028] FIG. 10 is a diagram illustrating a process for determining a compression ratio based on the shading state of a display and ambient brightness according to another embodiment of the present disclosure.

[0029] FIGS. 11A to 11D are drawings illustrating an embodiment of determining a compression ratio of image data based on the type of image displayed in a shaded area according to an embodiment of the present disclosure.

[0030] FIGS. 12a and 12b are drawings illustrating an embodiment in which a wireless receiving device is provided with a plurality of RF receiving interfaces and selectively operates a plurality of RF receiving interfaces depending on the shading state of a display.

[0031] Figure 13 is a diagram illustrating a lookup table showing the correspondence between transparency and compression ratio.

[0032] FIG. 14 is a flowchart illustrating a process of determining a compression ratio based on a shading state of a display and a motion value of an image displayed in a shading area according to an embodiment of the present disclosure.

[0033] A wireless transmission device according to an embodiment of the present disclosure is, for example, an intelligent device that adds a computer-assisted function to a broadcast reception function, and while remaining faithful to the broadcast reception function, it can be provided with an Internet function, etc., and can have a more convenient interface such as a manual input device, a touch screen, or a space remote control.

[0034] Wireless transmission devices can connect to the Internet and computers with wired or wireless Internet capabilities, enabling functions such as email, web browsing, banking, and gaming. A standardized, general-purpose operating system can be used for these diverse functions.

[0035] Accordingly, the wireless transmission device described in the present disclosure can perform various user-friendly functions, for example, since various applications can be freely added or deleted on a general-purpose OS kernel.

[0036] FIGS. 1 and 2 are drawings illustrating the configuration of a wireless display system according to an embodiment of the present disclosure.

[0037] Referring to FIG. 1, a wireless display system (1) according to one embodiment of the present disclosure may include a wireless transmission device (100) and a wireless reception device (200).

[0038] A wireless display system (1) may be a system in which a wireless transmission device (100) wirelessly transmits A / V data to a wireless reception device (200), and the wireless reception device (200) outputs A / V data.

[0039] The wireless transmission device (100) may be a device capable of encoding video and audio and wirelessly transmitting the encoded video and audio.

[0040] The wireless transmission device (100) may be a set-top box.

[0041] The wireless transmission device (100) can be connected to an external device such as a set-top box or a USB memory. The wireless transmission device (100) can transmit a video signal or audio signal received from the connected external device to the wireless reception device (200).

[0042] The wireless receiving device (200) may be a display device capable of wirelessly receiving encoded video and audio and decoding the received video and audio.

[0043] A wireless transmission device (100) and a wireless reception device (200) can constitute a video wall display system.

[0044] In video walls, display bezels with thin bezels play a crucial role in visualizing video content. To achieve this, it's efficient to have only the bare minimum components, with circuits or components for key functions housed in separate devices.

[0045] The wireless transmission device (100) can determine the compression rate of the video based on either the type of video input from the outside or the quality of communication between the wireless transmission device (100) and the wireless reception device (200).

[0046] The compression ratio of a video can be defined as the ratio of the size of the video data before encoding to the size of the video data after encoding.

[0047] The type of video can be any of the following: still video type, general video type, or game video type.

[0048] The wireless transmission device (100) can compress video according to a determined compression ratio and wirelessly transmit the compressed video to the wireless reception device (200).

[0049] The wireless receiving device (200) can restore compressed video received from the wireless transmitting device (100) and display the restored video on a display.

[0050] Figure 2 is a block diagram illustrating the detailed configuration of a wireless transmission device (100) and a wireless reception device (200).

[0051] Referring to FIG. 2, a wireless transmission device (100) may include a microphone (110), a wireless communication interface (120), a wired communication interface (130), a memory (140), a compression chip (150), an RF transmission interface (160), and a processor (190).

[0052] The microphone (110) can receive an audio signal and transmit it to the processor (190).

[0053] The microphone (110) can receive the voice spoken by the user.

[0054] The wireless communication interface (120) may include one or more of a Wi-Fi circuit and a Bluetooth circuit.

[0055] The Wi-Fi circuit can perform wireless communication with an external device or wireless receiving device (200) through the Wi-Fi standard.

[0056] The Bluetooth circuit can perform wireless communication through the Bluetooth Low Energy (BLE) standard.

[0057] The Bluetooth circuit can perform wireless communication with an external device such as a remote control or a wireless receiving device (200) through the Bluetooth Low Energy (BLE) standard.

[0058] The wireless communication interface (120) may also have a tuner for receiving broadcast signals.

[0059] The wired communication interface (130) may be an interface for wired connection with an external device. The wired communication interface (130) may include a plurality of HDMI (High Definition Multimedia Interface) terminals or USB (Universal Serial Bus) ports.

[0060] The wired communication interface (130) can receive a video signal or audio signal from an external device.

[0061] The memory (140) stores a program for signal processing and control, and can store signal-processed video, voice, or data signals.

[0062] The memory (140) may perform a function for temporary storage of video, voice, or data signals input from the outside, and may also store information about a specific image through a channel memory function.

[0063] The compression chip (150) can compress a video signal or audio signal input from the outside and transmit the compressed signal to the RF transmission interface (160).

[0064] The compression chip (150) may have an encoder for compressing a video signal or an audio signal.

[0065] The RF transmission interface (160) can transmit an A / V signal to the RF reception interface (240) of the wireless reception device (200) via RF (Radio Frequency) communication.

[0066] The RF transmission interface (160) may include one or more transmission antennas.

[0067] The RF transmission interface (160) can transmit a compressed A / V signal in digital form to the RF reception interface (240).

[0068] The RF transmission interface (160) can transmit A / V signals to the RF reception interface (240) through one or more channels.

[0069] The processor (190) can control the overall operation of the wireless transmission device (100). The processor (190) may be referred to as a main system on chip (Main SoC).

[0070] The processor (190) may also include a compression chip (150).

[0071] The wireless receiving device (200) may include a wireless communication interface (210), a wired communication interface (220), an RF receiving interface (240), a memory (250), a display (260), a speaker (270), a recovery chip (280), and a microcomputer (290).

[0072] The wireless communication interface (210) may include a Wi-Fi circuit, a Bluetooth circuit, and an IR circuit.

[0073] A Wi-Fi circuit can perform wireless communication through the Wi-Fi standard.

[0074] The Wi-Fi circuit can perform wireless communication with an external device or wireless transmission device (100) through the Wi-Fi standard.

[0075] The Bluetooth circuit can perform wireless communication through the Bluetooth Low Energy (BLE) standard.

[0076] The Bluetooth circuit can perform wireless communication with an external device such as a remote control or a wireless transmission device (100) through the Bluetooth Low Energy (BLE) standard.

[0077] The IR circuit can receive a signal from a remote control (300) to be described later via IR (Infrared) communication.

[0078] The wired communication interface (220) may be an interface for wired connection with an external device. The wired communication interface (220) may include multiple HDMI (High Definition Multimedia Interface) terminals or USB (Universal Serial Bus) ports.

[0079] The wired communication interface (220) can receive a video signal or audio signal from an external device.

[0080] The RF receiving interface (240) can receive a compressed A / V signal from the RF transmitting interface (160).

[0081] The RF receiving interface (240) may include one or more receiving antennas. The RF receiving interface (240) may be positioned at the bottom of the display (260).

[0082] The RF receiving interface (240) can receive a compressed A / V signal in digital form from the RF transmitting interface (160) and transmit the received A / V signal to the restoration chip (280).

[0083] The memory (250) stores a program for signal processing and control, and can store signal-processed video, voice, or data signals.

[0084] The display (260) can display a video signal received from the microcomputer (290).

[0085] The display (260) can display a video signal according to the operation of a timing controller (not shown).

[0086] The restoration chip (280) can restore the compressed A / V signal received by the RF receiving interface (240). The restoration chip (280) can include a decoder and can restore the compressed A / V signal through the decoder.

[0087] A microcomputer (microcomputer, 290) can control the overall operation of the wireless receiving device (200).

[0088] The microcomputer (290) can output a restored video signal through a display (260) and output a restored audio signal through a speaker (270).

[0089] FIG. 3 is a block diagram illustrating the configuration of a remote control device according to one embodiment of the present disclosure.

[0090] Referring to FIG. 3, the remote control device (300) may include a wireless communication interface (310), a user input interface (330), a memory (350), and a controller (390).

[0091] The wireless communication interface (310) may be an interface for performing wireless communication with a wireless transmission device (100) or a wireless reception device (200).

[0092] The wireless communication interface (310) may include a Bluetooth Low Energy (BLE) circuit (311) and an IR (InfraRed) circuit (313).

[0093] The BLE circuit (311) can transmit a signal to the wireless transmission device (100) to control the operation of the wireless transmission device (100).

[0094] The BLE circuit (311) can transmit a signal to the wireless transmission device (100) that triggers a pairing operation of the wireless transmission device (100).

[0095] The IR circuit (313) can transmit an IR signal to the wireless transmission device (100) for controlling the operation of the wireless transmission device (100) or the wireless reception device (200).

[0096] The user input interface (330) may be composed of a keypad, buttons, a touch pad, or a touch screen.

[0097] The user input interface (330) can generate control commands to control the operation of the wireless transmission device (100) or the wireless reception device (200) according to the user's operation commands.

[0098] When a hard key button is provided in the user input interface (330), the user can operate the hard key by pushing the hard key button.

[0099] The user input interface (330) may be equipped with various types of input means that can be operated by the user, such as a scroll key or a jog key.

[0100] The memory (350) can store a program for the operation of the controller (390) and can also temporarily store input / output data.

[0101] The controller (390) controls the operations associated with the application and, typically, the overall operation of the remote control device (300).

[0102] Fig. 4a is a perspective view of a wireless transmission device, Fig. 4b is a drawing explaining the internal structure of the wireless transmission device, and Fig. 4c is a drawing explaining the RF reception interface of the wireless reception device.

[0103] Referring to FIG. 4a, the wireless transmission device (100) may include a box (410), a sliding button receiving portion (401) for receiving a sliding button (401a), a dial (403), a power status indicator (405), and a communication quality status indicator (407).

[0104] The interior of the box (410) may contain components of the wireless transmission device (100) described in FIG. 2. The box (410) may be a housing capable of accommodating components of the wireless transmission device (100) described in FIG. 2.

[0105] The sliding button (401a) may be a means for controlling the vertical direction (tilting control) of the RF transmission interface (160) illustrated in FIG. 4b.

[0106] The dial (403) may be a means for controlling the horizontal rotation direction (panning control) of the RF transmission interface (160) illustrated in FIG. 4b.

[0107] The power status indicator (405) can indicate the power on or off status of the wireless transmission device (100). The power status indicator (405) can have one or more LEDs.

[0108] The communication quality status indicator (407) can indicate the communication quality status between the wireless transmission device (100) and the wireless reception device (200). The communication quality status indicator (407) can have one or more LEDs.

[0109] The communication quality status indicator (407) may not be provided in the box (410) as an optional configuration.

[0110] The processor (190) can receive pointing correction input through a sliding button (401a) or a dial (403).

[0111] The processor (190) can tilt the RF transmission interface (160) including the transmission antennas up and down according to an input that moves the sliding button (401a).

[0112] The RF transmission interface (160) may include a substrate and a plurality of transmission antennas. The RF transmission interface (160) may be provided on top of a heat sink (611) that discharges heat generated inside the box (410).

[0113] The processor (190) can rotate or pan the RF transmission interface (160) including the transmission antennas left and right in response to an input that moves the dial (403).

[0114] The user can perform antenna pointing correction by operating the sliding button (401a) or dial (403).

[0115] Referring to FIG. 4c, an RF receiving interface (240) may be provided at the bottom of the display (260) of the wireless receiving device (200).

[0116] The RF receiving interface (240) includes a substrate and a plurality of receiving antennas mounted on the substrate, and can receive A / V data from a wireless transmission device (100).

[0117] The RF receiving interface (240) may be positioned at the center bottom of the display (260). The RF receiving interface (240) may be positioned within a separate housing, and the housing may be positioned at the center bottom of the display (260).

[0118] The RF receiving interface (240) may include a front antenna array (241), an upper antenna array (242) positioned above the front antenna array (241), a lower antenna array (243) positioned below the front antenna array (241), a right antenna array (244) positioned on the right side of the front antenna array (241), and a left antenna array (245) positioned on the left side of the front antenna array (241).

[0119] In one embodiment, each of the front antenna array (241), the upper antenna array (242), the lower antenna array (243), the right antenna array (244), and the left antenna array (245) may include multiple receiving antennas.

[0120] In one embodiment, the receiving antennas included in each of the front antenna array (241), the upper antenna array (242), the lower antenna array (243), the right antenna array (244), and the left antenna array (245) may all be arranged to face the same direction.

[0121] In another embodiment, the front antenna array (241), the upper antenna array (242), the lower antenna array (243), the right antenna array (244), and the left antenna array (245) may each be arranged to face different directions.

[0122] FIGS. 5A to 5C are drawings explaining a shading state according to an embodiment of the present disclosure.

[0123] In one embodiment, the light-blocking state of the display (260) may be a state determined based on the area of ​​the light-blocking region in which light is blocked among the entire area of ​​the display (260). For example, the light-blocking state may be any one of a full light-blocking state in which the entire area of ​​the display (260) is light-blocked, a partial light-blocking state in which some area of ​​the display (260) is light-blocked, and a non-light-blocking state in which the entire area of ​​the display (260) is not light-blocked.

[0124] A fully shading state may be referred to as a first shading state. Some shading states may be referred to as second shading states. A non-shading state may be referred to as any of a transparent state, a light-transmitting state, or a third shading state.

[0125] FIG. 5a may represent a full shading state in which the entire area (500) of the display (260) is shading.

[0126] FIG. 5b may represent a partial light-blocking state in which a first partial area (501) of the entire area (500) of the display (260) is light-transmitting and a second partial area (503) is light-blocking.

[0127] FIG. 5c can represent a non-light-shielding state in which the entire area (500) of the display (260) is illuminated.

[0128] In another embodiment of the present disclosure, the shading state of the display (260) may include the degree of shading of the entire area of ​​the display (260) or the degree of shading of a partial area. The degree of shading may be a concept inversely proportional to transparency.

[0129] FIG. 6a and FIG. 6b are drawings explaining a non-electronic shading method according to one embodiment of the present disclosure, and FIG. 6c is a drawing explaining an electronic shading method according to another embodiment of the present disclosure.

[0130] The shading state of the display (260) can be controlled through a non-electronic shading method or an electronic shading method.

[0131] In one embodiment, a light-shielding film may be provided on one side of the display (260). The light-shielding film may block light transmitted through an area of ​​the display (260).

[0132] The shading film may be either a first type shading film or a second type shading film. The first type shading film may be a non-electronic shading film, and the second type shading film may be an electronic shading film.

[0133] The first type of shading film may be composed of any one of a polymer film, an opaque film, and a fiber film composed of fibers, but these are only examples.

[0134] A second type of shading film may be an electronic shading film, such as a liquid crystal display (LCD) panel.

[0135] In the case of a non-electronic shading method, the size of the shading area of ​​the display (260) can be adjusted according to the physical movement of the shading film of the first type.

[0136] In the case of the electronic shading method, the transmittance of the area of ​​the display (260) is electrically controlled, so that the shading state of the display (260) can be adjusted. The electronic shading method may be referred to as a liquid crystal shutter method.

[0137] First, we explain the non-electronic shading method.

[0138] Referring to FIG. 6A, the wireless receiving device (200) may include a display (260), a side frame (610), and a housing (90). The display (260) may display an image. The side frame (610) may extend along the perimeter of the display (260). The housing (90) may be positioned below the display (260) and the side frame (610). Alternatively, the housing (90) may be positioned above, to the left, or below the display (260) and the side frame (610).

[0139] The display (260) may include a first long side (LS1), a second long side (LS2) opposite the first long side (LS1), a first short side (SS1) adjacent to the first long side (LS1) and the second long side (LS2), and a second short side (SS2) opposite the first short side (SS1).

[0140] Meanwhile, for convenience of explanation, the lengths of the first and second long sides (LS1, LS2) are illustrated and described as being longer than the lengths of the first and second short sides (SS1, SS2), but it may also be possible for the lengths of the first and second long sides (LS1, LS2) to be approximately equal to or longer than the lengths of the first and second short sides (SS1, SS2).

[0141] The direction parallel to the long sides (LS1, LS2) of the display (260) may be referred to as the left-right direction. The direction parallel to the short sides (SS1, SS2) of the display (260) may be referred to as the up-down direction. The direction perpendicular to the long sides (LS1, LS2) and short sides (SS1, SS2) of the display (260) may be referred to as the front-back direction.

[0142] The direction in which the display (260) displays an image may be referred to as forward (z), and the opposite direction may be referred to as backward (-z). The first short side (SS1) may be referred to as left (x, Le). The second short side (SS2) may be referred to as right (-x, Ri). The first long side (LS1) may be referred to as upper (y, U). The second long side (LS2) may be referred to as lower (-y, D).

[0143] The interior of the housing (90) may include a shading film, one or more rollers for moving the shading film upward, and one or more motors for driving the one or more rollers.

[0144] The first type of shading film can be positioned at the rear of the back of the display (260) and can be moved up and down the display (260). The first type of shading film can have an area that can cover the back of the display (260).

[0145] The first type of shading film can be placed on the upper surface of the display (260), has the form of a curtain slide, and can be moved up and down.

[0146] The microcomputer (290) of the wireless receiving device (200) can control the movement of the first type of shade film by controlling one or more motors provided inside the housing (90).

[0147] Referring to FIG. 6b, a first type of shading film (620) covering the back of the display (260) is illustrated. The first type of shading film (620) can be pulled out or pulled in from the housing (90).

[0148] In Fig. 6b, the shading state of the display (260) may be a full shading state.

[0149] Next, the electronic shading method is described with reference to Fig. 6c.

[0150] Referring to FIG. 6c, a display (260) and a second type of shading film (630) positioned at the rear of the display (260) are illustrated. The second type of shading film (630) may be a liquid crystal display (LCD) panel.

[0151] The microcomputer (290) of the wireless receiving device (200) can control the LCD panel (630) to control the transmittance corresponding to a part or the entire area of ​​the display (260).

[0152] A microcomputer (290) or an image driving circuit (not shown) can transmit a control signal to the LCD panel (630) that controls the arrangement of liquid crystal molecules corresponding to an area of ​​the display (260), thereby adjusting the transmittance for the corresponding area. The image driving circuit may be included in the microcomputer (290) or may be a component provided separately from the microcomputer (290).

[0153] The control signal that controls the arrangement of liquid crystal molecules may be a voltage signal that controls the voltage applied to the liquid crystal layer of the LCD panel (630).

[0154] The LCD panel (630) may include two polarizing plates, a thin film transistor (TFT), and a liquid crystal layer. Each of the two polarizing plates may transmit light in one direction and block light in the other direction. The TFT may be a switching element that applies and blocks a voltage signal to the liquid crystal layer to control the arrangement of liquid crystal molecules. The liquid crystal molecules in the liquid crystal layer may be arranged according to the voltage signal received from the TFT. Light may be passed through or blocked depending on the arrangement of the liquid crystal molecules.

[0155] Light can pass through the first polarizing plate and then the liquid crystal layer. If the polarization direction of the light changes in the liquid crystal layer, it can pass through the second polarizing plate. If the polarization direction of the light changes depending on the arrangement of the liquid crystals, the amount of light passing through the second polarizing plate can vary. This allows the transmittance of the LCD panel (630) to be adjusted.

[0156] The image driving circuit can control the transmittance of a specific area by applying or blocking voltage only to pixels in that area through electrodes arranged in a matrix form on the LCD panel (630).

[0157] The wireless receiving device (200) can create a light-shielding area and a non-light-shielding area by adjusting the transmittance of a specific area of ​​the display (260).

[0158] FIGS. 7A and 7B are drawings illustrating various forms of a display according to an embodiment of the present disclosure.

[0159] Referring to Fig. 7a, a pixel may include a light emitting region and a transparent region. In the light emitting region, RGBW (Red, Green, Blue, White) subpixels may be arranged vertically, and the transparent region without subpixels may be arranged next to the light emitting region.

[0160] Accordingly, a display (260) having a plurality of pixels can not only display an image but also transmit light. The display (260) may be referred to as a transparent display panel or a transparent OLED (Organic Light Emitting Diode) panel.

[0161] Referring to FIG. 7B, a pixel may include a light emitting region and a transparent region. In the light emitting region, subpixels of RGW (Red, Green, White) or BGW (Blue, Green, White) may be arranged adjacent to each other, and the transparent region without subpixels may be arranged next to the light emitting region.

[0162] Accordingly, a display (260) having a plurality of pixels can not only display an image but also transmit light. The display (260) may be referred to as a transparent display panel or a transparent OLED panel.

[0163] FIG. 8 is a sequence diagram for explaining an operation method of a wireless display system according to an embodiment of the present disclosure.

[0164] Here, the compression ratio can be the size ratio of the original data and the compressed data. The compression ratio can be calculated as follows.

[0165] Compression ratio = size of original data / size of compressed data

[0166] The display (260) is described as an example of a display panel using an organic light emitting diode (OLED), but the display panel applicable to the present disclosure is not limited thereto.

[0167] Referring to FIG. 8, the processor (190) of the wireless transmission device (100) can obtain the shading state of the display (260) provided in the wireless reception device (200) (S801).

[0168] The processor (190) can receive information about the shading state of the display (260) from the wireless receiving device (200). The processor (190) can receive information about the shading state of the display (260) from the wireless receiving device (200) via the wireless communication interface (120). Specifically, the processor (190) can obtain information about the shading state of the display (260) from the wireless receiving device (200) via BLE communication.

[0169] Information about the shading state may include information indicating that the display (260) is operating in either a full shading state, a partial shading state, or a non-shading state.

[0170] The microcomputer (290) of the wireless receiving device (200) can obtain information on the shading status of the display (260) and transmit the obtained information on the shading status to the wireless transmitting device (100). The microcomputer (290) can obtain information on the shading status of the display (260) periodically or in real time.

[0171] The processor (190) of the wireless transmission device (100) can determine the compression ratio of image data based on the acquired shading state of the display (260) (S803).

[0172] In one embodiment, the processor (190) may determine the compression ratio of image data as a first compression ratio when the shading state of the display (260) is a full shading state. The first compression ratio may have a value within the range of 4 to 8, but this is merely an example.

[0173] When the display (260) is in a fully shaded state, the processor (190) can determine that the viewer intends to focus on the image and lower the compression rate of the image data to output a high-resolution image.

[0174] When the display (260) is in a non-shading state, the processor (190) may determine the compression ratio of the image data to be a second compression ratio greater than the first compression ratio. The second compression ratio may have a value within the range of 10 to 20, but this is merely an example.

[0175] When the display (260) is in a non-shading state, the viewer's viewing intention may be determined to be an intention to focus less on the image. The processor (190) may determine the compression ratio of the image data to be greater than the first compression ratio in order to output an image with a lower resolution than a high-resolution image.

[0176] When the shading state of the display (260) changes from a full shading state to a non-shading state, the processor (190) can adjust the compression ratio of the image data from the first compression ratio to the second compression ratio.

[0177] When the compression ratio of image data is adjusted from the first compression ratio to the second compression ratio as the shading state of the display (260) changes from a full shading state to a non-shading state, the size of image data transmitted to the wireless receiving device (200) can be reduced.

[0178] As the size of the image data is reduced, the image data can be stably transmitted to the wireless receiving device (200) even in a wireless interference environment. In addition, as the size of the image data is reduced, the number of antennas used for transmitting and receiving data can be reduced, thereby reducing the power consumption required for the operation of the antennas.

[0179] In one embodiment, when the shading state of the display (260) is a partially shading state, the processor (190) may determine different compression ratios for the shading area and the non-shading area of ​​the display (260). For example, the processor (190) may determine the compression ratio of first image data displayed in the shading area of ​​the display (260) as the first compression ratio, and may determine the compression ratio of second image data displayed in the non-shading area of ​​the display (260) as the second compression ratio.

[0180] Meanwhile, the shading area may be referred to as an opaque area, and the non-shading area may also be referred to as a transparent area.

[0181] Meanwhile, in another embodiment of the present disclosure, the processor (190) can increase the compression ratio of image data to a third compression ratio higher than the preset compression ratio or the second compression ratio while the shading state of the display (260) is changed (e.g., while the shading film (91) is moved).

[0182] The processor (190) of the wireless transmission device (100) can compress image data at a compression ratio determined through the compression chip (150) (S805).

[0183] The processor (190) of the wireless transmission device (100) can transmit compressed image data to the wireless reception device (200) via the RF transmission interface (160) (S807).

[0184] The microcomputer (290) of the wireless receiving device (200) can restore compressed image data through the restoration chip (280) (S809).

[0185] The microcomputer (290) of the wireless receiving device (200) can display an image based on the restored image data on the display (260) (S811).

[0186] FIGS. 9A to 9C are drawings explaining a method for controlling the compression ratio of image data according to the operation of a non-electronic shading method according to one embodiment of the present disclosure.

[0187] The wireless receiving device (200) can obtain the light-blocking state of the display (260) based on the distance of the light-blocking film provided in the housing (90). If the light-blocking film is extended beyond the first short side toward the first long side of the display (260), the wireless receiving device (200) can obtain the light-blocking state of the display (260) as a full light-blocking state. If the light-blocking film is not extended from the housing (90), the wireless receiving device (200) can obtain the light-blocking state of the display (260) as a non-light-blocking state.

[0188] The wireless receiving device (200) can obtain the light-blocking state of the display (260) as a partial light-blocking state when the light-blocking film is extended a certain distance toward the first long side of the display (260) but less than the first short side. When the light-blocking state of the display (260) is a partial light-blocking state, the wireless receiving device (200) can transmit information about the light-blocking state, including the light-blocking coordinates indicating the light-blocking area of ​​the display (260) and the partial light-blocking state, to the wireless transmitting device (100).

[0189] The wireless transmission device (100) can identify the shaded area and the non-shaded area of ​​the display (260) based on the shaded coordinates and some shaded states.

[0190] In FIG. 9A, the light-blocking state of the display (260) may be in a full light-blocking state in which the light-blocking film provided in the housing (90) blocks light from the entire area of ​​the display (260). When the light-blocking state of the display (260) is determined to be a full light-blocking state, the wireless transmission device (100) may transmit high-resolution image data having a first compression ratio (within the range of 4 to 8) to the wireless reception device (200).

[0191] In FIG. 9b, the light-blocking state of the display (260) may be a non-light-blocking state in which the light-blocking film provided in the housing (90) is not pulled out. When the light-blocking state of the display (260) is determined to be a non-light-blocking state, the wireless transmission device (100) may transmit low-resolution image data having a second compression ratio (within the range of 10 to 20) to the wireless reception device (200).

[0192] When the shading state of the display (260) is in a non-shading state, the entire area of ​​the display (260) may be in a light-transmitting state, so that the background (930) at the back of the display (260) may be exposed while displaying a low-resolution image (931).

[0193] In this way, according to an embodiment of the present disclosure, when the light-shielding film (91) blocks the entire area of ​​the display (260), the wireless transmission device (100) lowers the compression rate of the image data, thereby enabling the viewer to view high-quality images. In addition, according to an embodiment of the present disclosure, when the light-shielding film (91) does not block the entire area of ​​the display (260), the wireless transmission device (100) increases the compression rate of the image data, thereby reducing the power consumption of the wireless display system and appropriately responding to a wireless connection failure environment.

[0194] In Fig. 9c, the light-blocking state of the display (260) may be in a partial light-blocking state in which a light-blocking film (91) provided in the housing (90) is partially pulled out. When the light-blocking state of the display (260) is determined to be a partial light-blocking state, the wireless transmission device (100) may transmit high-resolution first image data having a first compression ratio (within the range of 4 to 8) and low-resolution second image data having a second compression ratio (within the range of 10 to 20) to the wireless reception device (200).

[0195] The wireless transmission device (100) can receive information about a shading state including shading coordinates indicating a shading area (951) and some shading states from the wireless reception device (200).

[0196] The wireless transmission device (100) can identify a shading area (951) using shading coordinates, and can compress first image data corresponding to a first image to be displayed in the identified shading area (951) at a first compression ratio. The wireless transmission device (100) can compress second image data corresponding to a second image to be displayed in a non-shading area (953) other than the shading area (951) at a second compression ratio.

[0197] The wireless transmission device (100) can transmit first image data having a first compression ratio and second image data having a second compression ratio to the wireless reception device (200). The wireless reception device (200) can restore the first image data and display a first image based on the restored first image data in a shaded area (951) of the display (260), and can restore the second image data and display a second image based on the restored second image data in a non-shaded area (953) of the display (260).

[0198] FIG. 10 is a diagram illustrating a process for determining a compression ratio based on the shading state of a display and ambient brightness according to another embodiment of the present disclosure.

[0199] FIG. 10 may be an operation performed after step S803 of FIG. 8.

[0200] The processor (190) of the wireless transmission device (100) can determine the compression rate of image data based on the shading state (S803), and then obtain the ambient brightness of the display (260) (S1001).

[0201] The processor (190) can obtain information about the ambient brightness of the display (260) from the wireless receiving device (200). The wireless receiving device (200) can be equipped with a light sensor placed on one side of the display (260). The light sensor can measure a resistance value that changes according to the intensity of light, and can convert the measured resistance value into an ambient brightness value.

[0202] The wireless receiving device (200) can transmit the ambient brightness value measured by the light sensor to the wireless transmitting device (100) through the wireless communication interface (210).

[0203] The processor (190) can change the compression ratio determined based on the ambient brightness of the display (260) (S1003) and transmit the image data compressed with the changed compression ratio to the wireless receiving device (200) (S1005).

[0204] In one embodiment, the processor (190) may change the compression ratio initially determined based on the shading state of the display (260) by taking into account the ambient brightness. For example, the processor (190) may decrease the determined compression ratio as the ambient brightness value received from the wireless receiving device (200) increases (brightens), and may increase the determined compression ratio as the ambient brightness value decreases (darkens).

[0205] The memory (140) of the wireless transmission device (100) may store a lookup table indicating a correspondence between ambient brightness values ​​and a compression ratio adjustment degree matching the ambient brightness values. The processor (190) may extract a compression ratio adjustment degree matching the ambient brightness values ​​through the lookup table stored in the memory (140), and may change the compression ratio based on the extracted compression ratio adjustment degree.

[0206] Accordingly, when the surrounding environment of the display (260) becomes brighter, the image compression rate decreases, allowing the viewer to view high-resolution images. Furthermore, when the surrounding environment of the display (260) becomes darker, the image compression rate increases, allowing image data to be transmitted without interruption even in a wirelessly interrupted environment.

[0207] FIGS. 11A to 11D are drawings illustrating an embodiment of determining a compression ratio of image data based on the type of image displayed in a shading area according to an embodiment of the present disclosure.

[0208] In FIGS. 11a to 11d, the light-blocking method of the display (260) can be either a non-electronic light-blocking method or an electronic light-blocking method.

[0209] The processor (190) of the wireless transmission device (100) can determine whether the light-blocking state of the display (260) is partially light-blocking (S1101).

[0210] If the shading state of the display (260) is determined to be a partial shading state, the processor (190) can obtain the type of image displayed in the shading area (S1103).

[0211] In one embodiment, the type of the video may be either a content video type or an information video type. The content video type may be a type representing any of a broadcast program, content provided by a content provider, or a video provided by a video streaming service.

[0212] Informational video types may be those intended to provide basic information such as weather, time, and schedule.

[0213] The type of image to be displayed in the shaded area may vary depending on user settings. The processor (190) may determine the type of image to be displayed in the shaded area based on user setting information.

[0214] The processor (190) can determine a compression ratio corresponding to the type of the acquired image (S1107).

[0215] The processor (190) can determine the compression rate of the image data as a first compression rate when the type of the image is a content image type, and can determine the compression rate of the image data as a second compression rate higher than the first compression rate when the type of the image is an information image type.

[0216] That is, when a content image is displayed in a shaded area, the image quality can be improved by lowering the compression rate of the image data, and when an information image is displayed in a shaded area, the wireless transmission quality can be improved by increasing the compression rate of the image data.

[0217] When the type of image displayed in the shaded area is a content image type, the processor (190) can compress image data corresponding to the content image at a first compression ratio and transmit the compressed image data to the wireless receiving device (200). The wireless receiving device (200) can restore the compressed image data and display the restored content image on the shaded area of ​​the display (260).

[0218] When the type of image displayed in the shaded area is an information image type, the processor (190) can compress image data corresponding to the information image at a second compression ratio and transmit the compressed image data to the wireless receiving device (200). The wireless receiving device (200) can restore the compressed image data and display the restored information image on the shaded area of ​​the display (260).

[0219] Meanwhile, the processor (190) may determine a compression ratio of image data corresponding to an image to be displayed in a non-shading area of ​​the display (260) to be a third compression ratio higher than the second compression ratio. The processor (190) may compress image data corresponding to an image to be displayed in a non-shading area with the third compression ratio and transmit the compressed image data to the wireless receiving device (200). The wireless receiving device (200) may display the compressed image data on the non-shading area of ​​the display (260).

[0220] The processor (190) can determine the compression ratio of image data according to the shading state of the display (260), whether it is a full shading state or a non-shading state (S1109). This is replaced with the description of step S803 of FIG. 8.

[0221] In FIGS. 11b and 11c, the entire area of ​​the display (260) can be divided into a light-shielding area (1110) and a non-light-shielding area (1130). The light-shielding area (1110) may be an area that is light-shielded by the movement of a physical light-shielding film (91) or an electronic light-shielding method. The non-light-shielding area (1130) may be a transparent area that is not light-shielded.

[0222] The shaded area (1110) may be a temporarily shaded area or a permanently shaded area.

[0223] FIG. 11b explains the case where the image to be displayed on the shading area (1110) of the display (260) is a content image type.

[0224] The wireless transmission device (100) can determine the compression ratio of the content image (1111) as a first compression ratio, and can compress content image data corresponding to the content image (1111) with the determined first compression ratio.

[0225] The wireless transmission device (100) can transmit content image data compressed at a first compression ratio to the wireless reception device (200). The wireless transmission device (100) can also transmit coordinate information indicating the location of the shading area (1110) to the wireless reception device (200) together with the compressed content image data.

[0226] The wireless receiving device (200) can display a content image (1111) on the shading area (1110) of the display (260) based on the received coordinate information and compressed content image data.

[0227] Figure 11c explains assuming that the image to be displayed on the shading area (1110) of the display (260) is an information image type.

[0228] The wireless transmission device (100) can determine the compression ratio of the information image (1113) to be a second compression ratio higher than the first compression ratio, and can compress information image data corresponding to the information image (1113) at the determined second compression ratio.

[0229] The wireless transmission device (100) can transmit information image data compressed at a second compression ratio to the wireless reception device (200). The wireless transmission device (100) can also transmit coordinate information indicating the location of the shading area (1110) to the wireless reception device (200) together with the compressed information image data.

[0230] The wireless receiving device (200) can display an information image (1113) on the shaded area (1110) of the display (260) based on the received coordinate information and compressed information image data.

[0231] Meanwhile, in FIGS. 11b and 11c, no image may be displayed in the non-shading area (1130). Accordingly, the background behind the display (260) may be exposed through the non-shading area (1130).

[0232] In another embodiment, in FIGS. 11B and 11C, the wireless transmission device (100) can compress non-shading image data to be displayed on the non-shading area with a third compression ratio higher than the second compression ratio, and transmit the non-shading image data compressed with the third compression ratio to the wireless reception device (200). At the same time, the wireless transmission device (100) can transmit coordinate information indicating the location of the non-shading area to the wireless reception device (200) together with the non-shading image data compressed with the third compression ratio.

[0233] The wireless receiving device (200) can display a non-shading image (1131) on the non-shading area (1130) of the display (260) based on the received coordinate information and compressed non-shading image data.

[0234] In this way, according to an embodiment of the present disclosure, when a content image is displayed in a light-shielding area, the image quality can be improved by lowering the compression rate of the image data, and when an information image is displayed in a light-shielding area, the wireless transmission quality can be improved by increasing the compression rate of the image data.

[0235] In addition, according to an embodiment of the present disclosure, the image quality can be improved by lowering the compression ratio of the image corresponding to the shaded area, and the wireless transmission quality can be improved by increasing the compression ratio of the image corresponding to the non-shaded area.

[0236] FIG. 11d is a drawing illustrating a case where the shading area (1150) and the non-shading area (1170) of the display (260) have the same area. A first image (1151) based on first image data compressed with a first compression ratio can be displayed on the shading area (1150), and a second image (1171) based on second image data compressed with a second compression ratio can be displayed on the non-shading area (1170).

[0237] When the electronic shading method is used in FIG. 11d, the microcomputer (290) of the wireless receiving device (200) can control the LCD panel (630) positioned at the rear of the display (260) to adjust the transmittance of each area of ​​the display (260). Accordingly, the entire area of ​​the display (260) can be classified into a shading area (1150) and a non-shading area (1170).

[0238] FIGS. 12a and 12b are drawings illustrating an embodiment in which a wireless receiving device is provided with a plurality of RF receiving interfaces and selectively operates a plurality of RF receiving interfaces depending on the shading state of a display.

[0239] The wireless receiving device (100) may be provided with a first RF receiving interface (240-1) positioned on one side of the lower portion of the display (260) and a second RF receiving interface (240-2) positioned a certain distance away from the first RF receiving interface (240-1) in the direction in which the long side of the display (260) extends.

[0240] Each of the first RF receiving interface (240-1) and the second RF receiving interface (240-2) may have the same function and structure as the RF receiving interface (240) disclosed in FIG. 4c.

[0241] In FIG. 12A, the entire area of ​​the display (260) may include a shading area (1210) and a non-shading area (1230). The non-shading area (1230) is a transparent area, and no image may be displayed. That is, the wireless transmission device (100) may transmit compressed image data so that the image is displayed only in the shading area (1210) of the display (260).

[0242] It is assumed that the image displayed in the shaded area (1210) is an information image (1211).

[0243] The processor (190) of the wireless transmission device (100) can select an interface with better wireless performance among the first RF receiving interface (240-1) and the second RF receiving interface (240-2) when the display (260) is partially shaded.

[0244] The processor (190) can obtain a first wireless quality indicator between the RF transmission interface (160) and the first RF reception interface (240-1) and a second wireless quality indicator between the RF transmission interface (160) and the second RF reception interface (240-2).

[0245] The wireless quality indicator can be either the Received Signal Strength Indicator (RSSI) or the Signal to Noise Ratio (SNR).

[0246] When the display (260) is partially shaded and the first wireless quality indicator is greater than the second wireless quality indicator, the processor (190) may transmit compressed image data corresponding to the information image (1211) to the first RF reception interface (240-1) via the RF transmission interface (160). To this end, the processor (190) may transmit an off command to the wireless reception device (200) to turn off the operation of a plurality of reception antennas provided in the second RF reception interface (240-2). The off command may be transmitted to the wireless reception device (200) via BLE communication.

[0247] Accordingly, when the light-blocking state of the display (260) is in a partially light-blocking state, power consumption can be reduced while maintaining wireless quality by selectively operating either one of the first RF receiving interface (240-1) or the second RF receiving interface (240-2).

[0248] In Fig. 12b, the shading state of the display (260) may be in a non-shading state.

[0249] The processor (190) of the wireless transmission device (100) can select an interface with better wireless performance among the first RF receiving interface (240-1) and the second RF receiving interface (240-2) when the display (260) is in a non-shading state.

[0250] The processor (190) can obtain a first wireless quality indicator between the RF transmission interface (160) and the first RF reception interface (240-1) and a second wireless quality indicator between the RF transmission interface (160) and the second RF reception interface (240-2).

[0251] When the display (260) is in a non-shading state and the first wireless quality index is greater than the second wireless quality index, the processor (190) may transmit compressed image data corresponding to the image (1250) to the first RF reception interface (240-1) through the RF transmission interface (160). To this end, the processor (190) may transmit an off command to the wireless reception device (200) to turn off the operation of a plurality of reception antennas provided in the second RF reception interface (240-2). The off command may be transmitted to the wireless reception device (200) through BLE communication.

[0252] Accordingly, when the shading state of the display (260) is in a non-shading state, power consumption can be reduced while maintaining wireless quality by selectively operating either the first RF receiving interface (240-1) or the second RF receiving interface (240-2).

[0253] Meanwhile, in another embodiment of the present disclosure, when the shading state of the display (260) is in a partially shading state or a non-shading state and the first wireless quality index falls below a preset index while image data is being transmitted through the first RF receiving interface (240-1), the processor (190) may transmit an on command to the wireless receiving device (200) to turn on the operation of the second RF receiving interface (240-2).

[0254] Accordingly, even if the wireless quality indicator with respect to the first RF receiving interface (240-1) is low (for example, when an obstacle exists between the first RF receiving interface and the wireless transmission device), the second RF receiving interface (240-2) can be immediately operated to quickly overcome the wireless interference environment.

[0255] According to another embodiment of the present disclosure, the wireless transmission device (100) may adjust the compression ratio of image data based on the transparency of the non-shading area when the display (260) is in a non-shading state. The transparency may correspond to the degree of shading. As the transparency increases, the degree of shading may decrease, and as the transparency decreases, the degree of shading may increase.

[0256] For this purpose, the wireless transmission device (100) may store a lookup table indicating the correspondence between transparency and compression ratio in the memory (140).

[0257] Figure 13 is a diagram illustrating a lookup table showing the correspondence between transparency and compression ratio.

[0258] The memory (140) of the wireless transmission device (100) can store a lookup table (1300) indicating a correspondence between the transparency and compression ratio of an area of ​​the display (260). As the transparency increases, the compression ratio can also increase, and as the transparency decreases, the compression ratio can also decrease.

[0259] Under the electronic shading method, the transparency of a specific area of ​​the display (260) can be adjusted. The wireless transmitting device (100) can receive information about the transparency of the entire area or a part of the display (260) from the wireless receiving device (200).

[0260] The wireless transmission device (100) can extract a compression ratio corresponding to the transparency of the area from the lookup table (1300) based on the information about the received transparency.

[0261] The wireless transmission device (100) may determine the compression ratio of the first image to be displayed on the first area as 4 when the transparency of the first area of ​​the display (260) is 10, and may determine the compression ratio of the second image to be displayed on the second area as 20 when the transparency of the second area of ​​the display (260) is 50. Each of the first area and the second area may be a non-shading area, but may also be a shading area.

[0262] In this way, according to the embodiments of the present disclosure, the compression rate of image data can be adjusted based on the transparency of the area formed by the display (260). Accordingly, unnecessary power consumption can be reduced, and data can be efficiently transmitted even in wireless interference environments.

[0263] According to another embodiment of the present disclosure, the wireless transmission device (100) can adjust the compression rate of image data based on the absence of the viewer. The wireless transmission device (100) can detect the absence of the viewer while transmitting the image data compressed at a compression rate determined based on the shading state of the display (260) to the wireless reception device (200).

[0264] The wireless transmission device (100) can detect the absence of a viewer based on a sensing signal obtained through an infrared detection sensor or an image signal obtained through a camera provided on the top of the display (260).

[0265] The wireless transmission device (100) can further increase the determined compression ratio when the absence of a viewer is detected. If the viewer is not watching the video, the compression ratio of the video data can be increased to prevent unnecessary power consumption.

[0266] According to another embodiment of the present disclosure, the compression ratio can be determined based on the shading state of the display (260) and the motion value of the image displayed in the shading area.

[0267] FIG. 14 is a flowchart illustrating a process of determining a compression ratio based on a shading state of a display and a motion value of an image displayed in a shading area according to an embodiment of the present disclosure.

[0268] In Fig. 14, the light-blocking method of the display (260) can be either a non-electronic light-blocking method or an electronic light-blocking method.

[0269] Referring to FIG. 14, the processor (190) of the wireless transmission device (100) can determine whether the shading state of the display (260) is a full shading state or a partial shading state (S1401).

[0270] When the shading state of the display (260) is determined to be a full shading state or a partial shading state, the processor (190) can determine a compression ratio according to each state (S1403).

[0271] The processor (190) can obtain the motion value of the image displayed on the shaded area in a full shaded state or a partial shaded state (S1405).

[0272] In one embodiment, the microcomputer (290) of the wireless receiving device (200) can extract the value of the motion vector of an image displayed in a shaded area using a motion estimation / motion compensation (MEMC) technique, and can obtain the value of the extracted motion vector as the motion value of the image.

[0273] The MEMC technique may be a technique that extracts the difference between two consecutive video frames as a difference map and uses the extracted difference map to generate a frame to be inserted between the previous frame and the current frame following the previous frame.

[0274] The microcomputer (290) can extract the value of a motion vector corresponding to an image during the motion prediction process of the MEMC technique, and can obtain the value of the extracted motion vector as the motion value of the image. The motion value can indicate the degree of movement of an object included in the image.

[0275] The microcomputer (290) can transmit the motion value of the image to the wireless transmission device (100) via BLE communication.

[0276] The processor (190) can change the determined compression ratio to increase when the motion value is less than the threshold value (S1407) (S1409).

[0277] If the motion value of the image is less than a threshold value, the processor (190) determines that the image or still image has little object movement, and can additionally increase the compression ratio of the image data.

[0278] In this way, according to an embodiment of the present disclosure, the compression ratio can be adjusted according to the shading state of the display (260) and the motion value of the image displayed on the shading area. Accordingly, the number of unnecessarily used receiving antennas can be reduced, thereby reducing power consumption.

[0279] When the display (260) is in a non-shading state, the processor (190) can determine the compression ratio of image data corresponding to the non-shading state (S1109). This is replaced with the description of step S803 of FIG. 8.

[0280] A wireless transmission device (100) according to an embodiment of the present disclosure may include a compression chip (150) that compresses image data, an RF (Radio Frequency) transmission interface (160) that wirelessly transmits the compressed image data to a wireless reception device (200), and a processor (190) that obtains a shading state of a display (260) provided in the wireless reception device (200) and adjusts a compression ratio of the image data based on the obtained shading state.

[0281] The above shading state may indicate the degree of shading for an area of ​​the display (260), and the processor (190) may reduce the compression ratio as the degree of shading increases, and may increase the compression ratio as the degree of shading decreases.

[0282] The entire area of ​​the display (260) includes a first area and a second area with different degrees of shading, and the processor (190) can determine different compression rates of first image data corresponding to a first image to be displayed on the first area and second image data corresponding to a second image to be displayed on the second area.

[0283] The above processor (190) can increase the compression ratio to a preset compression ratio while the light-blocking film (91) disposed on the rear of the display (260) moves.

[0284] The processor (190) can obtain the ambient brightness of the display (260) and readjust the compression ratio based on the obtained ambient brightness.

[0285] The above processor (190) can decrease the compression ratio as the ambient brightness becomes brighter, and increase the compression ratio as the ambient brightness becomes darker.

[0286] The above-mentioned shading state may be any one of a full shading state in which the entire area of ​​the display (260) is shading, a partial shading state in which some area of ​​the display (260) is shading, or a non-shading state in which the entire area of ​​the display (260) is not shading.

[0287] The above processor (190) can adjust the compression ratio based on the type of image displayed on the shaded area in the above partial shaded state.

[0288] The processor (190) may determine a compression ratio of content image data corresponding to the content image displayed on the shading area as a first compression ratio when the type of the image is a content image type, and may determine a compression ratio of information image data corresponding to the information image displayed on the shading area as a second compression ratio higher than the first compression ratio when the type of the image is an information image type.

[0289] The processor (190) may determine the compression ratio of the image data as a first compression ratio in the fully shading state, may determine the compression ratio of the image data as a second compression ratio higher than the first compression ratio in the non-shading state, may determine the compression ratio of the image to be displayed on the shading area as the first compression ratio in the partially shading state, and may determine the compression ratio of the image to be displayed on the non-shading area as the second compression ratio.

[0290] The processor (190) may transmit an on command to the wireless receiving device (200) to turn on the operation of the RF receiving interface with the best wireless performance among the plurality of RF receiving interfaces (240-1, 240-2) provided in the wireless receiving device (200) when the light-blocking state of the display (260) is in the partially light-blocking state or the non-light-blocking state.

[0291] The above processor (190) can increase the adjusted compression ratio when the absence of the viewer is detected.

[0292] The above processor (190) can increase the compression ratio when the motion value of the image data is less than a threshold value.

[0293] The wireless transmission device (100) may further include a wireless communication interface (120), and the processor (190) may receive information on the shading state of the display (260) from the wireless reception device (200) through the wireless communication interface (120).

[0294] According to one embodiment of the present disclosure, the above-described method can be implemented as processor-readable code on a medium in which a program is recorded. Examples of processor-readable media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, and optical data storage devices.

Claims

1. In a wireless transmission device, A compression chip that compresses image data; An RF (Radio Frequency) transmission interface for wirelessly transmitting the compressed image data to a wireless receiving device; and A processor that obtains the shading status of a display provided in the wireless receiving device and adjusts the compression ratio of the image data based on the obtained shading status. Wireless transmission device.

2. In paragraph 1, The above shading status indicates the degree of shading for the area of ​​the display, The above processor The higher the degree of shading, the lower the compression ratio, and the lower the degree of shading, the higher the compression ratio. Wireless transmission device.

3. In paragraph 1, The entire area of ​​the above display includes a first area and a second area having different degrees of shading, The above processor The compression ratio of the first image data corresponding to the first image to be displayed on the first area and the compression ratio of the second image data corresponding to the second image to be displayed on the second area are determined differently from each other. Wireless transmission device.

4. In paragraph 1, The above processor The compression ratio is increased to a preset compression ratio while the shade film placed on the back of the display is moved. Wireless transmission device.

5. In paragraph 1, The above processor Obtaining the ambient brightness of the above display and readjusting the compression ratio based on the acquired ambient brightness. Wireless transmission device.

6. In paragraph 5, The above processor The brighter the surrounding brightness, the lower the compression ratio, and the darker the surrounding brightness, the higher the compression ratio. Wireless transmission device.

7. In paragraph 1, The above shading condition is Either a full shading state in which the entire area of ​​the display is shading, a partial shading state in which some areas of the display are shading, or a non-shading state in which the entire area of ​​the display is not shading. Wireless transmission device.

8. In paragraph 7, The above processor Adjusting the compression ratio based on the type of image displayed on the shaded area in the above-mentioned partial shaded state Wireless transmission device.

9. In paragraph 8, The above processor If the type of the above image is a content image type, the compression ratio of the content image data corresponding to the content image displayed on the shading area is determined as the first compression ratio, If the type of the above image is an information image type, the compression ratio of information image data corresponding to the information image displayed on the shading area is determined as a second compression ratio higher than the first compression ratio. Wireless transmission device.

10. In paragraph 7, The above processor In the above full shading state, the compression ratio of the image data is determined as the first compression ratio, In the above non-shading state, the compression ratio of the image data is determined as a second compression ratio higher than the first compression ratio, In the above partial shading state, the compression ratio of the image to be displayed on the shading area is determined as the first compression ratio, and the compression ratio of the image to be displayed on the non-shading area is determined as the second compression ratio. Wireless transmission device.

11. In paragraph 7, The above processor When the shading state of the display is in the partially shading state or the non-shading state, an on command is transmitted to the wireless receiving device to turn on the operation of the RF receiving interface with the best wireless performance among the plurality of RF receiving interfaces provided in the wireless receiving device. Wireless transmission device.

12. In paragraph 1, The above processor When the absence of the viewer is detected, the above-mentioned adjusted compression ratio is increased. Wireless transmission device.

13. In paragraph 1, The above processor If the motion value of the above image data is less than the threshold value, the compression ratio is increased. Wireless transmission device.

14. In paragraph 1, Further comprising a wireless communication interface, The above processor Receiving information about the shading status of the display from the wireless receiving device through the wireless communication interface Wireless transmission device.

15. In a wireless display system including a wireless transmitting device and a wireless receiving device, The above wireless transmission device Wirelessly transmit compressed image data to a wireless receiving device, acquire a shading status of a display provided in the wireless receiving device, and adjust a compression ratio of the image data based on the acquired shading status. The above wireless receiving device Restore compressed image data received from the wireless transmission device, and display an image based on the restored image data on the display, The wireless receiving device includes a light-shielding film arranged on one side of the display, and the light-shielding film blocks light from the entire area or a part of the display using either a non-electronic light-shielding method or an electronic light-shielding method. Wireless display system.

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