Comparison between Hitachi 55HAK5751 vs Hitachi 50R81

General Info
Model Number	Hitachi 55HAK5751	Hitachi 50R81

Price	Check on Amazon	Check on Amazon
Type	TV	TV
Year	2020	2020
Brand	Hitachi	Hitachi
Model Number	55HAK5751	50R81
Display
Screen Size Class	55" (inches)	50" (inches)
Diagonal Size	54.65 in 138.8 cm 1388 mm 4.55 ft	49.49 in 125.7 cm 1257 mm 4.12 ft
Screen Width	47.62 in 121 cm 1209.6 mm 3.97 ft	43.14 in 109.6 cm 1095.84 mm 3.6 ft
Screen Height	26.79 in 68 cm 680.4 mm 2.23 ft	24.27 in 61.6 cm 616.41 mm 2.02 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	0.315 mm	0.285 mm
Screen Pixel Density	80 ppi	89 ppi
Screen-to-Body Ratio	91.96 %	92.18 %
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 HLG (Hybrid Log Gamma) Dolby Vision	HDR10
3D	No	No
Size, weight, color
Case Depth	3.23 in 8.2 cm 82 mm 0.27 ft	3.5 in 8.9 cm 89 mm 0.29 ft
Case Weight		11.25 kg 25 lbs
Case Width with Stand	48.94 in 124.3 cm 1243 mm 4.08 ft	44.21 in 112.3 cm 1123 mm 3.68 ft
Case Height with Stand	30.79 in 78.2 cm 782 mm 2.57 ft	28 in 71.1 cm 711.1 mm 2.33 ft
Case Depth with Stand	9.84 in 25 cm 250 mm 0.82 ft	10.37 in 26.4 cm 263.5 mm 0.86 ft
Case Weight with Stand	12.9 kg 28 lbs	11.4 kg 25 lbs
Case Color	Black	Black
Hardware
CPU Cores	4
TV Tuner	Analog (NTSC/PAL/SECAM) DVB-T DVB-T2 DVB-C DVB-S DVB-S2	ATSC Clear QAM
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 Bluetooth 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 802.11ac (IEEE 802.11ac) Wi-Fi Direct DLNA
Connectivity	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+	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
Audio
Audio Speakers	2 x 10W	2 x 8W
Features
OS	Android 9.0 Pie	Roku TV
Cool Features	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)	Dynamic Contrast Voice Search V-Chip 120 Hz Backlight Frequency 4K PicturePerfect Super Resolution Processor
Ergonomics
Case Width	48.94 in 124.3 cm 1243 mm 4.08 ft	44.21 in 112.3 cm 1123 mm 3.68 ft
Case Height	28.35 in 72 cm 720 mm 2.36 ft	25.69 in 65.3 cm 652.5 mm 2.14 ft
Vesa Mount Support	Yes	Yes
VESA Interface Standard Size	200 x 200	400 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	BPI	NULL
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 55HAK5751

Hitachi 50R81