Comparison between Hitachi 50R81 vs Hitachi 55HAK5751

General Info
Model Number	Hitachi 50R81	Hitachi 55HAK5751

Price	Check on Amazon	Check on Amazon
Type	TV	TV
Year	2020	2020
Brand	Hitachi	Hitachi
Model Number	50R81	55HAK5751
Display
Screen Size Class	50" (inches)	55" (inches)
Diagonal Size	49.49 in 125.7 cm 1257 mm 4.12 ft	54.65 in 138.8 cm 1388 mm 4.55 ft
Screen Width	43.14 in 109.6 cm 1095.84 mm 3.6 ft	47.62 in 121 cm 1209.6 mm 3.97 ft
Screen Height	24.27 in 61.6 cm 616.41 mm 2.02 ft	26.79 in 68 cm 680.4 mm 2.23 ft
Display Type	VA	VA
Display Bit Depth	10 bits (8 bits + FRC)	10 bits (8 bits + FRC)
Frame Rate Control	Yes	Yes
Max Number of Colors	1073741824	1073741824
Bits	30	30
Screen Aspect Ratio	16:9	16:9
Screen Resolution	3840 x 2160	3840 x 2160
Screen Pixel Pitch	0.285 mm	0.315 mm
Screen Pixel Density	89 ppi	80 ppi
Screen-to-Body Ratio	92.18 %	91.96 %
Backlight Source	Direct LED	Direct LED
Screen Brightness		350 cd/m²
Static Screen Contrast		6000 : 1
Screen Horizontal Viewing Angle	178 °	178 °
Screen Vertical Viewing Angle	178 °	178 °
HDR	HDR10	HDR10 HLG (Hybrid Log Gamma) Dolby Vision
3D	No	No
Size, weight, color
Case Depth	3.5 in 8.9 cm 89 mm 0.29 ft	3.23 in 8.2 cm 82 mm 0.27 ft
Case Weight	11.25 kg 25 lbs
Case Width with Stand	44.21 in 112.3 cm 1123 mm 3.68 ft	48.94 in 124.3 cm 1243 mm 4.08 ft
Case Height with Stand	28 in 71.1 cm 711.1 mm 2.33 ft	30.79 in 78.2 cm 782 mm 2.57 ft
Case Depth with Stand	10.37 in 26.4 cm 263.5 mm 0.86 ft	9.84 in 25 cm 250 mm 0.82 ft
Case Weight with Stand	11.4 kg 25 lbs	12.9 kg 28 lbs
Case Color	Black	Black
Hardware
CPU Cores		4
TV Tuner	ATSC Clear QAM	Analog (NTSC/PAL/SECAM) DVB-T DVB-T2 DVB-C DVB-S DVB-S2
Built-in Camera	No	No
Network	LAN Wi-Fi 802.11a (IEEE 802.11a-1999) 802.11b (IEEE 802.11b-1999) 802.11g (IEEE 802.11g-2003) 802.11n (IEEE 802.11n-2009) 802.11n 5GHz 802.11ac (IEEE 802.11ac) Wi-Fi Direct DLNA	LAN Wi-Fi 802.11a (IEEE 802.11a-1999) 802.11b (IEEE 802.11b-1999) 802.11g (IEEE 802.11g-2003) 802.11n (IEEE 802.11n-2009) 802.11n 5GHz Bluetooth Wi-Fi Direct DLNA
Connectivity	2 x HDMI 2.0 (CEC) 1 x HDMI 2.0 (CEC; ARC) 1 x S/PDIF 1 x Antenna (RF) 1 x 3.5 mm Audio Out 1 x AV Composite In (Video + L/R) 1 x USB (5V / 500mA) 1 x Ethernet RJ45	4 x HDMI 2.0 (ARC; CEC) 1 x D-sub (Component in (YPbPr)) 1 x AV Composite In (Video + L/R) 1 x 3.5 mm Audio Out 1 x Optical Audio Out 1 x Satellite In (F-type female) 2 x USB 2.0 1 x Antenna (RF) 1 x Ethernet RJ45 1 x CI+
Audio
Audio Speakers	2 x 8W	2 x 10W
Features
OS	Roku TV	Android 9.0 Pie
Cool Features	Dynamic Contrast Voice Search V-Chip 120 Hz Backlight Frequency 4K PicturePerfect Super Resolution Processor	Google Assistant HbbTV 2.0 Wide Color Gamut Netflix UHD Upscaler YouTube Super Resolution Micro Dimming Amazon Prime Video Ultra Contrast Chromecast built-in USB Recording (PVR Ready)
Ergonomics
Case Width	44.21 in 112.3 cm 1123 mm 3.68 ft	48.94 in 124.3 cm 1243 mm 4.08 ft
Case Height	25.69 in 65.3 cm 652.5 mm 2.14 ft	28.35 in 72 cm 720 mm 2.36 ft
Vesa Mount Support	Yes	Yes
VESA Interface Standard Size	400 x 200	200 x 200
Removable VESA Stand	Yes	Yes
Height Adjustment	No	No
Landscape or Portrait Pivot Support	No	No
Left or Right Swivel Support	No	No
Forward and Backward Tilt Support	No	No
Frequency and Interpolation
Vertical Digital Frequency	50 Hz / 60 Hz	50 Hz / 60 Hz
Screen Interpolation Technology		Best Picture Index
Screen Interpolation Value		1200
Screen Interpolation Measurement Unit	NULL	BPI
Accessories
Certificates and Standards
Usage and Storage Requirements
Safe Operating Temperature Level	5 °C - 35 °C 41 °F - 95 °F
Safe Operating Humidity Level	0 % - 80 %

Hitachi 50R81

Hitachi 55HAK5751