A wireless display sink device comprising a display panel driver, a PCB, Printed Circuit Board, a detachable wireless communication module connected to the PCB through a card slot, and a backlight unit that is configured to illuminate a display panel, the PCB comprising: a decoder that is configured to decode audio/video data received from the detachable wireless communication module and is configured to separate audio data and video data; an audio DAC, Digital Analog Converter, that is configured to convert the audio data into an analog signal; a timing controller that is configured to transmit the video data to the display panel driver and is configured to control the operation timing of the display panel driver; a power supply part that is configured to generate power and is configured to supply the power to pixels of the display panel; a light source driver that is configured to generate a light source driving voltage to turn on the light sources of the backlight unit; video/audio lines that are configured to transmit video data and audio data in high-frequency signals between the detachable wireless communication module and the decoder; a first shield slot around at least one of the power supply part and the light source driver; and a second shield slot between at least one of the power supply part and the light source driver and the video/audio lines, wherein the timing controller is configured to receive an HDMI signal or TMDS, Transition Minimized Differential Signaling, signal output directly from the decoder, wherein the wireless display sink device further comprises a decryption unit connected to an output terminal of the decoder that is configured to restore a signal encrypted by HDPC, High-bandwidth Digital Content Protection, format and received from the decoder, wherein the PCB further comprises a connector that is configured to receive an external input video signal via a cable, and the timing controller is configured to receive an output video signal from the decoder through a first input port and to receive the external input video signal through a second input port. a decoder that is configured to decode audio/video data received from the detachable wireless communication module and is configured to separate audio data and video data; an audio DAC, Digital Analog Converter, that is configured to convert the audio data into an analog signal; a timing controller that is configured to transmit the video data to the display panel driver and is configured to control the operation timing of the display panel driver; a power supply part that is configured to generate power and is configured to supply the power to pixels of the display panel; a light source driver that is configured to generate a light source driving voltage to turn on the light sources of the backlight unit; video/audio lines that are configured to transmit video data and audio data in high-frequency signals between the detachable wireless communication module and the decoder; a first shield slot around at least one of the power supply part and the light source driver; and a second shield slot between at least one of the power supply part and the light source driver and the video/audio lines, wherein the timing controller is configured to receive an HDMI signal or TMDS, Transition Minimized Differential Signaling, signal output directly from the decoder, wherein the wireless display sink device further comprises a decryption unit connected to an output terminal of the decoder that is configured to restore a signal encrypted by HDPC, High-bandwidth Digital Content Protection, format and received from the decoder, wherein the PCB further comprises a connector that is configured to receive an external input video signal via a cable, and the timing controller is configured to receive an output video signal from the decoder through a first input port and to receive the external input video signal through a second input port.