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- Table of Contents
- Top
- Main Differences
- Design
- Picture Quality
- Motion
- Inputs
- Sound Quality
- Smart Features
- Comments
TCL R635 vs TCL 6 Series/R648 2021 8k QLED
Side-by-Side Comparison
Products
TCL R635
TCL 6 Series/R648 2021 8k QLED
Tested using Methodology v1.6
Updated Feb 10, 2025 02:46 PM
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Updated Feb 07, 2025 06:36 PM
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Resolution4k
TypeLED
Sub-TypeVA
Resolution8k
TypeLED
Sub-TypeVA
Variants
- 55R635 (55")
- 65R635 (65")
- 75R635 (75")
- 65R648 (65")
- 75R648 (75")
Our Verdict
TCL R635
TCL 6 Series/R648 2021 8k QLED
The TCL 6 Series/R648 2021 8k QLED and the TCL 6 Series/R635 2020 QLED are part of the same lineup, but they have different features. The R648 has an 8k resolution, while the R635 is 4k. The 8k resolution is supposed to deliver clear images, but the R635 still does a better job at displaying 480 and native 4k content. The R648 improves in a few ways, like the better local dimming, HDMI 2.1 inputs, and better reflection handling, but the R635 still gets brighter in HDR.
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55"
55R635
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65"
65R635
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65R648
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75R635
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Finding store75"
75R648
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Finding storeNotice: Two or more of the products selected have been tested with different test methodologies, so some of the results below aren't directly comparable. Learn how our test benches and scoring system work, and read more about the latest changes to our TVs test methodology.
Main Differences for
Threshold
Mixed Usage
7.8
7.9
480p Input
8.0
4.0
Pre Calibration
6.1
8.9
Reflections
7.0
8.4
Full Comparison
Design
Style
Design Picture
Curved
No
No
Accelerated Longevity Test
Uniformity Pictures
Month 24
50% Gray
Month 24
50% Gray
Longevity Graph
Stand
Stand Picture
Back
Back Picture
Wall Mount
VESA 300x300
VESA 400x400
Borders
Borders Picture
Borders
0.35" (0.9 cm)
0.39" (1.0 cm)
Thickness
Thickness Picture
Max Thickness
3.66" (9.3 cm)
2.99" (7.6 cm)
Build Quality
7.5
7.5
Build quality picture
Picture Quality
Contrast
9.0
8.9
Contrast Picture
Contrast
10,537 : 1
134,133 : 1
Native Contrast
5,560 : 1
3,065 : 1
Blooming
7.5
Blooming Photo
Lighting Zone Transitions
7.5
Preferred LD Video, Moving Object
Local Dimming
Yes
Yes
Backlight
Full-Array
Full-Array
Dimming Zones Count Of Tested TV
160
Contrast And Dark Details In Game Mode
8.0
Blooming Photo In Game Mode
Preferred LD Video, Moving Object In Game Mode
Game Transitions With VRR And Preferred LD
HDR Brightness
8.4
8.2
HDR Hallway Photo
HDR Cityscape Photo
HDR Landscape Photo
Hallway Lights (~1950 cd/m²)
597 cd/m²
Yellow Skyscraper (~700 cd/m²)
353 cd/m²
Landscape Pool (~300 cd/m²)
255 cd/m²
Peak 2% Window
599 cd/m²
770 cd/m²
Peak 10% Window
986 cd/m²
1,067 cd/m²
Peak 25% Window
1,080 cd/m²
1,154 cd/m²
Peak 50% Window
790 cd/m²
817 cd/m²
Peak 100% Window
662 cd/m²
626 cd/m²
Sustained 2% Window
597 cd/m²
756 cd/m²
Sustained 10% Window
980 cd/m²
1,045 cd/m²
Sustained 25% Window
1,072 cd/m²
1,137 cd/m²
Sustained 50% Window
788 cd/m²
815 cd/m²
Sustained 100% Window
660 cd/m²
624 cd/m²
Automatic Brightness Limiting (ABL)
0.033
0.032
EOTF
Real Scene Highlight
885 cd/m²
HDR Brightness In Game Mode
8.4
8.2
HDR Hallway Photo
HDR Cityscape Photo
HDR Landscape Photo
Hallway Lights (~1950 cd/m²)
597 cd/m²
Yellow Skyscraper (~700 cd/m²)
348 cd/m²
Landscape Pool (~300 cd/m²)
256 cd/m²
Peak 2% Window
603 cd/m²
771 cd/m²
Peak 10% Window
1,003 cd/m²
1,069 cd/m²
Peak 25% Window
1,096 cd/m²
1,161 cd/m²
Peak 50% Window
796 cd/m²
824 cd/m²
Peak 100% Window
665 cd/m²
632 cd/m²
Sustained 2% Window
600 cd/m²
761 cd/m²
Sustained 10% Window
999 cd/m²
1,054 cd/m²
Sustained 25% Window
1,081 cd/m²
1,148 cd/m²
Sustained 50% Window
793 cd/m²
822 cd/m²
Sustained 100% Window
664 cd/m²
631 cd/m²
Automatic Brightness Limiting (ABL)
0.034
0.032
Game Mode EOTF
Real Scene Highlight
863 cd/m²
PQ EOTF Tracking
8.4
PQ EOTF Graph
600 Nit Tracking Delta
0.0102
1000 Nit Tracking Delta
0.0104
4000 Nit Tracking Delta
0.0105
SDR Brightness
8.8
8.9
Real Scene Peak Brightness
679 cd/m²
687 cd/m²
Peak 2% Window
568 cd/m²
724 cd/m²
Peak 10% Window
907 cd/m²
1,039 cd/m²
Peak 25% Window
988 cd/m²
1,123 cd/m²
Peak 50% Window
869 cd/m²
795 cd/m²
Peak 100% Window
596 cd/m²
608 cd/m²
Sustained 2% Window
567 cd/m²
720 cd/m²
Sustained 10% Window
902 cd/m²
1,018 cd/m²
Sustained 25% Window
982 cd/m²
1,106 cd/m²
Sustained 50% Window
865 cd/m²
792 cd/m²
Sustained 100% Window
594 cd/m²
606 cd/m²
Automatic Brightness Limiting (ABL)
0.034
0.033
Color Gamut
8.4
8.6
Wide Color Gamut
Yes
Yes
Color Gamut DCI-P3 Picture
DCI P3 xy
91.01%
90.95%
DCI P3 uv
94.57%
96.19%
Color Gamut Rec.2020 Picture
Rec 2020 xy
69.72%
75.03%
Rec 2020 uv
78.81%
82.71%
Color Volume
8.0
8.3
P3 Color Volume ITP Picture
1,000 cd/m² DCI P3 Coverage ITP
45.0%
77.1%
2020 Color Volume ITP Picture
10,000 cd/m² Rec 2020 Coverage ITP
37.3%
39.1%
White Luminance
743 cd/m²
Red Luminance
156 cd/m²
Green Luminance
528 cd/m²
Blue Luminance
64 cd/m²
Cyan Luminance
592 cd/m²
Magenta Luminance
221 cd/m²
Yellow Luminance
683 cd/m²
Normalized DCI P3 Coverage ITP
86.8%
Normalized Rec 2020 Coverage ITP
71.9%
Local Dimming
6.0
LD Video, Moving Object
LD Video, Real Content
LD Video, Real Content Side View
Local Dimming
Yes
Yes
Backlight
Full-Array
Full-Array
Pre Calibration
6.1
8.9
Pre White Balance Picture
Pre Gamma Curve Picture
Pre Color Picture
White Balance dE
4.48
1.97
Color dE
3.65
0.96
Gamma
2.28
2.13
Color Temperature
5,753 K
6,513 K
Picture Mode
Movie
Movie
Color Temp Setting
Warm
Warm
Gamma Setting
2.2
2.2
Post Calibration
9.4
9.7
Post White Balance Picture
Post Gamma Curve Picture
Post Color Picture
White Balance dE
0.23
0.17
Color dE
1.55
0.57
Gamma
2.20
2.20
Color Temperature
6,478 K
6,503 K
White Balance Calibration
11 point
11 point
Color Calibration
Yes
Yes
Gray Uniformity
7.1
7.4
50% Uniformity Picture
50% Std. Dev.
2.489%
1.286%
50% DSE
0.189%
0.202%
5% Uniformity Picture
5% Std. Dev.
2.053%
0.965%
5% DSE
0.135%
0.127%
Black Uniformity
6.7
7.8
Black Uniformity Picture With Preferred Local Dimming
Std. Dev.
0.831%
0.829%
Native Black Uniformity Picture
Native Std. Dev.
1.889%
1.509%
Viewing Angle
5.4
5.2
Viewing Angle Video
Chroma Graph
Color Washout
25°
21°
Hue Graph
Color Shift
24°
31°
Lightness Graph
Brightness Loss
34°
35°
Black Level Raise
19°
14°
Gamma Shift
16°
12°
Reflections
7.0
8.4
Reflections Picture
Average Room Off Picture
Bright Room Off Picture
Screen Finish
Semi-gloss
Semi-gloss
Total Reflections
6.0%
3.2%
Indirect Reflections
1.1%
1.0%
Calculated Direct Reflections
4.9%
2.2%
Local Dimming In Game Mode
6.0
LD Video, Moving Object
LD Video, Real Content
LD Video, Real Content Side View
Local Dimming
Yes
Backlight
Full-Array
HDR Native Gradient
6.2
7.5
HDR Gradient Picture
100% Black to 50% Gray
4.0
50% Gray to 100% White
8.0
100% Black to 50% Red
8.0
50% Red to 100% Red
10
100% Black to 50% Green
6.0
50% Green to 100% Green
8.0
100% Black to 50% Blue
6.0
50% Blue to 100% Blue
10
Color Depth
10 Bit
Red (Std. Dev.)
0.204
Green (Std. Dev.)
0.176
Blue (Std. Dev.)
0.184
Gray (Std. Dev.)
0.152
Low-Quality Content Smoothing
5.6
Low-Quality Content Smoothing Picture
Smoothing
5.0
Detail Preservation
7.0
Upscaling: Sharpness Processing
8.0
4.0
Sharpness Picture - 480p
Pixels
Pixels Picture
Subpixel Layout
BGR
Type
LED
LED
Sub-Type
VA
VA
720p Input
8.0
720p Picture
1080p Input
9.0
1080p Picture
4k Input
10
4k Picture
8k Input
0.0
8k Picture
Temporary Image Retention
10
Image Retention Picture
IR after 0 min recovery
0.00%
IR after 2 min recovery
0.00%
IR after 4 min recovery
0.00%
IR after 6 min recovery
0.00%
IR after 8 min recovery
0.00%
IR after 10 min recovery
0.00%
Permanent Burn-In Risk
10
Permanent Burn-In Risk
No
Motion
Response Time
8.4
8.6
Motion Blur Picture
Response Time Chart
80% Response Time
3.8 ms
3.6 ms
100% Response Time
11.1 ms
9.5 ms
Flicker-Free
9.9
9.9
Backlight chart
Flicker-Free
No
No
PWM Dimming Frequency
960 Hz
960 Hz
Black Frame Insertion (BFI)
BFI Picture
BFI Frequency Picture
Optional BFI
Yes
Yes
Min Flicker For 60 fps
60 Hz
60 Hz
60Hz For 60 fps
Yes
Yes
120Hz For 120 fps
No
Yes
Min Flicker for 60 fps in Game Mode
60 Hz
60 Hz
Motion Interpolation
Motion Interpolation (30 fps) Picture
Motion Interpolation (30 fps)
Yes
Yes
Motion Interpolation (60 fps) Picture
Motion Interpolation (60 fps)
Yes
Yes
Stutter
7.0
6.7
Frame Hold Time @ 24 fps
30.6 ms
32.2 ms
Frame Hold Time @ 60 fps
5.6 ms
7.2 ms
24p Judder
10
10
Judder-Free 24p
Yes
Yes
Judder-Free 24p via 60p
Yes
Yes
Judder-Free 24p via 60i
Yes
Yes
Judder-Free 24p via Native Apps
Yes
Yes
Variable Refresh Rate
8.2
9.4
Native Refresh Rate
120 Hz
120 Hz
Variable Refresh Rate
Yes
Yes
HDMI Forum VRR
Yes
Yes
FreeSync
Yes
Yes
G-SYNC Compatible
Yes
Yes
4k VRR Maximum
60 Hz
120 Hz
4k VRR Minimum
48 Hz
< 20 Hz
1080p VRR Maximum
120 Hz
120 Hz
1080p VRR Minimum
< 20 Hz
< 20 Hz
1440p VRR Maximum
120 Hz
120 Hz
1440p VRR Minimum
< 20 Hz
< 20 Hz
VRR + Local Dimming
Yes
VRR Supported Connectors
HDMI
Inputs
Input Lag
9.2
9.4
1080p @ 60Hz
18.4 ms
15.3 ms
1080p @ 60Hz Outside Game Mode
144.0 ms
112.3 ms
1080p @ 120Hz
8.8 ms
6.3 ms
1080p @ 144Hz
N/A
1440p @ 60Hz
17.9 ms
15.2 ms
1440p @ 120Hz
9.3 ms
6.3 ms
1440p @ 144Hz
N/A
4k @ 60Hz
17.8 ms
15.1 ms
4k @ 60Hz + 10-Bit HDR
18.0 ms
15.2 ms
4k @ 60Hz @ 4:4:4
17.8 ms
15.1 ms
4k @ 60Hz Outside Game Mode
143.7 ms
110.6 ms
4k @ 60Hz With Interpolation
151.5 ms
103.9 ms
4k @ 120Hz
N/A
6.2 ms
4k @ 144Hz
N/A
8k @ 60Hz
N/A
15.2 ms
1080p with Variable Refresh Rate
N/A
1440p with VRR
N/A
4k with VRR
N/A
8k with VRR
N/A
Supported Resolutions
7.9
10
Resolution
4k
8k
480p @ 59.94Hz (Widescreen)
Yes
720p @ 59.94Hz
Yes
1080p @ 60Hz @ 4:4:4
No
Yes
1080p @ 120Hz
Yes (native support)
Yes
1080p @ 144Hz
No
1440p @ 60Hz
Yes (forced resolution required)
Yes (forced resolution required)
1440p @ 120Hz
Yes (native support)
Yes
1440p @ 144Hz
No
4k @ 60Hz
Yes
Yes
4k @ 60Hz @ 4:4:4
Yes
Yes
4k @ 120Hz
No
Yes
4k @ 120Hz @ 4:4:4
Yes
4k @ 144Hz
No
8k @ 30Hz or 24Hz
No
Yes
8k @ 60Hz
No
Yes
PS5 Compatibility
PS5 Screenshot
Auto Low Latency Mode (ALLM)
Yes
Yes
4k @ 120Hz
No
Yes
1440p @ 120Hz
Yes
Yes
1080p @ 120Hz
Yes
Yes
HDR
Yes
Xbox Series X Screenshot
VRR
Yes
Yes
PS5, 4k @ 120Hz + HDR
No
PS5, 4k @ 60Hz + HDR
Yes
Xbox Series X, 4k @ 120Hz + HDR
No
Xbox Series X, 4k @ 120Hz
No
Yes
Xbox Series X, 4k @ 60Hz + HDR
Yes
Xbox Series X, 1440p @ 120Hz
Yes
Yes
Xbox Series X, 1080p @ 120Hz
Yes
Yes
Xbox Series X, Variable Refresh Rate
Yes
Yes
Xbox Series X|S Compatibility
Xbox Series X Screenshot
Auto Low Latency Mode (ALLM)
Yes
4k @ 120Hz
No
Yes
1440p @ 120Hz
Yes
Yes
1080p @ 120Hz
Yes
Yes
HDR
Yes
VRR
Yes
Yes
Inputs Specifications
HDR10
Yes
Yes
HDR10+
No
No
Dolby Vision
Yes
Yes
HLG
Yes
Yes
HDMI 2.0 Full Bandwidth
Yes (HDMI 1,2,3,4)
Yes (HDMI 1,2,3,4)
HDMI 2.1 Class Bandwidth
No
Yes (HDMI 1,2)
CEC
Yes
Yes
HDCP 2.2
Yes (HDMI 1,2,3,4)
Yes (HDMI 1,2,3,4)
ATSC Tuner
1.0
USB 3.0
No
No
Variable Analog Audio Out
Yes
Yes
Wi-Fi Support
Yes (2.4 GHz, 5 GHz)
Yes (2.4 GHz, 5 GHz)
Input Photos
Side Inputs Picture
Rear Inputs Picture
Total Inputs
HDMI
4
4
USB
1
1
Digital Optical Audio Out
1
1
Analog Audio Out 3.5mm
1
1
Analog Audio Out RCA
0
0
Component In
0
0
Composite In
1 (adapter required, not incl.)
0
Tuner (Cable/Ant)
1
1
Ethernet
1
1
DisplayPort
0
0
IR In
0
0
SD/SDHC
0
Audio Passthrough
ARC/eARC Port
Yes
eARC
eARC: Dolby Atmos Over Dolby Digital Plus
Yes
Yes
eARC: Dolby Digital Plus 7.1
Yes
eARC: LPCM 7.1 Over Dolby MAT
Yes
eARC: Dolby TrueHD 7.1
Yes
ARC
Yes (HDMI 4)
eARC: DTS:X Over DTS-HD MA
Yes
Yes
eARC: DTS-HD Master Audio 7.1
Yes
eARC: LPCM Channels (Bitstream)
2.0
ARC: Dolby Digital 5.1
Yes
Yes
ARC: DTS 5.1
Yes
Yes
Optical: Dolby Digital 5.1
Yes
Yes
Optical: DTS 5.1
Yes
Yes
Sound Quality
Frequency Response
7.7
7.4
Frequency Response
Low-Frequency Extension
80.00 Hz
75.51 Hz
Std. Dev. @ 70
3.25 dB
4.13 dB
Std. Dev. @ 80
3.31 dB
4.13 dB
Std. Dev. @ Max
3.84 dB
4.66 dB
Max
90.3 dB SPL
93.8 dB SPL
Dynamic Range Compression
1.56 dB
4.40 dB
Distortion
8.1
6.9
Total Harmonic Distortion
Weighted THD @ 80
0.033
0.127
Weighted THD @ Max
0.340
0.962
IMD @ 80
0.60%
0.52%
IMD @ Max
1.95%
6.85%
Smart Features
Interface
8.0
8.0
Smart TV Picture
Smart OS
Roku TV
Roku TV
Version
9.3.2
10.0.2
Ease of Use
Easy
Easy
Smoothness
Very Smooth
Very Smooth
Time Taken to Select YouTube
4 s
4 s
Time Taken to Change Backlight
3 s
4 s
Advanced Options
Many
Many
Ad-Free
0.0
0.0
Ads Picture
Ads
Yes
Yes
Opt-out
No
No
Suggested Content in Home
Yes
Yes
Opt-out of Suggested Content
No
No
Apps and Features
8.0
8.0
Apps Picture
App Selection
Great
Great
App Smoothness
Average
Average
Cast Capable
Yes
Yes
USB Drive Playback
Yes
Yes
USB Drive HDR Playback
Yes
Yes
HDR in Netflix
Yes
Yes
HDR in YouTube
Yes
Yes
Remote
7.0
7.0
Remote Picture
Size
Small
Medium
Voice Control
Search, Some Other Features
Search, Some Other Features
CEC Menu Control
Yes
Yes
Other Smart Features
No
No
Remote App
Roku
Roku
TV Controls
Controls Picture
In The Box
In The Box Picture
Misc
Power Consumption
71 W
130 W
Power Consumption (Max)
219 W
290 W
Firmware
9.3.2 build 5006-88
10.0.2 build 4264-AH
Check Price
55"
55R635
Searching
Finding store55"
65"
65R635
Searching
Finding store65"
65R648
Searching
Finding store75"
75R635
Searching
Finding store75"
75R648
Searching
Finding store
TCL R635
TCL 6 Series/R648 2021 8k QLED
Comments
TCL R635 vs TCL 6 Series/R648 2021 8k QLED: Main Discussion
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