LG evo M Series M3 77" Wireless 4K HDR Smart OLED TV - Manual (Page 8)

8
Precautions before using wireless TV
Wireless TVs use high-frequency radio waves of 60 GHz to transmit a large amount of data in a very short time, enabling wireless transmission of high-quality
video and audio. The 60 GHz frequency band used in wireless TVs is advantageous for large-capacity data transmission, has good linearity, and is well-suited for
transmission and reception in a specific direction. However, if there is a metallic object in the transmission/reception path, the radio waves cannot pass through
it. Non-conductive objects (e.g., glass, wood, plastic) may attenuate the signal, resulting in communication failure. Due to such characteristics of radio waves,
viewing is not affected when the wireless TV transmitting and receiving antennas are facing each other; however, if there are obstacles in the transmission/
reception path, the wireless signal may be attenuated or disconnected, resulting in inconvenience during viewing. This is not a product malfunction. Follow the
installation method provided when using the product.
Understanding 60 GHz wireless
Characteristics of
radio waves
Frequencies in
the 60 GHz band
applied to wireless
TVs
(high frequency)
Frequencies applied
to general wireless
communication (cell
phone, WiFi/BT)
(low frequency)
Linearity Strong Weak
Transmission volume High Low
Directionality
Ideal for transmission
in specific direction
Ideal for broad
coverage
Attenuation
High loss
(linearity)
Low loss and good
avoidance (diffraction)
Radio waves
absorbed by water
droplets and water
vapour in the air
Good obstacle
avoidance
• Wireless TVs use frequencies in the 60 GHz band.
• The 60 GHz band is also known as millimetre wave (mmWave), and
enables the transmission of large data volumes without delays.
• The 60 GHz band is a high-frequency band used in satellite
communication.
• High-frequency bands have excellent linearity .
• High linearity is ideal for transmission in a specific direction; however,
obstacles cause greater attenuation loss .
• Path loss occurs due to the presence of multiple paths created by
diffraction, refraction, reflection, etc. The multiple path loss resulting
from diffraction, refraction, and reflection causes antenna transmission
and reception failure.
• Generally, wireless radio waves experience interference from
obstacles .
• Conductive obstacles (metal) shield the frequency (antenna
transmission/reception), whereas non-conductive obstacles (glass,
wood, and plastic) cause attenuation.
• Radio waves using high frequencies in the 60 GHz band (short
wavelengths) provide optimal image through the use of beamforming
technology. Beamforming technology arranges multiple antennas at
regular intervals, adjusts the amplitude and phase of the signal supplied
to each antenna, and creates an antenna beam in a specific direction to
strongly transmit and receive signals to that direction.
• For optimal image viewing, the transmission/reception must be facing
each other, that is, have an unobstructed Line Of Sight (LOS).
• LOS is the visible path, which must be clear of obstacles in the way. If
there are obstacles, the receiver must be high enough that it is visible.
That is, the receiver must be higher than the transmitter.
(For wireless
TVs, the Zero Connect Box must be placed lower than the TV
Screen.)