Model Name 55N21          
OS LG webOS TV          
Chasis RTD2874          
Digital TV or ATV Digital   TV          
Display Technology DLED          
Resolution 3840*2160          
Picture
Back Light   Unit D-LED          
Resolution 3840*2160          
Panel Brightness (cd/m2) 200-250          
Contrast Ratio 1200:1(typ.)          
Response Time 8ms(typ.)          
Uniformity ＞65%(typ.)          
Color gamut 70%NTSC(typ.)          
Viewing Angle (H/V) 178°/178°(typ.)          
Life Time ＞20,000hrs (min)          
Color 1.07B   (8bit+FRC)          
Color Temperature Cool/Normal/Warm          
Aspect Ratio 16:9/4:3/Origina/   Vertical Zoom/4-way Zoom          
Picture Mode  Eco/Standard/Vivid/Cinema/Game/Sport          
Energy Saving OFF/MINI/MEDIUM/MAX   /SCREEN OFF          
Eye Comfort Mode YES          
HDMI UHD Deep Color 4K@60Hz          
Noise Reduction Medium/   High/Low/ Auto/ off          
SOUND
Sound out Internal   speaker/ HDMI ARC /Optical/Bluetooth          
Internal  Speakers  type Normal   speakers          
Internal Speaker Powers 2*10W          
Sound mode Cinema/Music/Standard/Clear/Game/Sport          
TV Installation Type Stand   / Wall-mounted          
Digital Sound out PCM/DOLBY   Digital PLUS/ HEAAC          
Auto voice control Yes          
Surround Yes          
HW   INFO.
Operating   System LG  webOS TV 2.0          
CPU A75*2+A55*2          
GPU IMG BXE4(700MHz）          
Coprocessor 4   core          
DDR/Flash DDR   1.5GB / eMMC 8GB          
DTV DVB-T/C/T2/S/S2/ISDB-T/ATSC          
Audio MPEG1   layer 1/2,MPEG 2 layer 2, Dolby digital, Dolby digital plus.           
Image Processing Technology HDR   / HLG           
Color System PAL/SECAM          
Media  Format    MPEG-4, H.264, H.265,VP9，Doiby digital，Dolby digital plus，Dolby MS11, Dolby MS12, MPEG1/2,VC-1,XVID          
Air mouse RC OPTION(With magic RCU）          
Voice Control OPTION(With magic RCU）          
Bluetooth YES          
LG Channels YES          
Camera USB YES          
Multi-screen YES          
Apple homekit YES          
Apple   airplay YES          
Matter IoT   ready YES          
Bluetooth   surround YES          
WiFi IEEE   802.11 b/g/n/AC  2.4G/5G          
Software   features
ATV PAL/SECAM/NTSC          
DTV DVB/ISDB-T/ATSC/DTMB(OPTION)          
OSD English,  Spanish, French, Portuguese etc.          
Apps Netflix,YouTube，Prime video，Densiy+，AIRPLAY, APPLE HOMEKIT, Browser,LG Store, Media, etc.          
Browser Native   browser          
Favourite Programs Yes          
Programs Searching Yes          
Recording Yes          
Sleep Timer off/10/20/30/60/90/120/180/240min          
Software upgrading USB   / OTA          
TERMINALS
HDMI 3          
USB 2          
AV in 1*RCA          
Earphone 1          
PC Audio N/A          
RF 2（for DVB-S2)           
Component(Y/Pb/Pr) N/A          
VGA N/A          
SPDIF OPTICAL*1          
SCART N/A          
CI Yes (ONLY EU   MARKET)          
BASIC   Info.
Power   Supply AC100-240V~  50/60HZ          
Power Consumption-TV on ≤150W          
Power Consumption-Standby ≤0.5W          
Unpackaged   With Base Stand (mm) 1226*261*768mm          
Unpackaged  Without Base   Stand 1226*80*712mm          
Packaged Dimension (L*H*W) 1265*105*756mm