LG B4 55" vs TCL QM8 75"
Side-by-side comparison of viewing distance, PPI, and specifications
Category Ranking
Pixel Density (PPI)28in category
LG B4 55"80 PPI #2
TCL QM8 75"59 PPI #24
57 PPI118 PPI
HDR Peak Brightness28in category
LG B4 55"677 nits #27
TCL QM8 75"5000 nits #1
677 nits5000 nits
DCI-P3 Color Gamut28in category
LG B4 55"99% #4
TCL QM8 75"97% #15
94%100%
Refresh Rate
LG B4 55"120 Hz
TCL QM8 75"120 Hz
StandardHighUltra
Summary
- Sharpness: no visible difference — Both screens exceed the retina threshold at 250cm. The LG B4 55" has 36% higher pixel density (80 vs 59 PPI), but this only becomes visible below 109cm.
- Brightness: advantage TCL QM8 75" — The TCL QM8 75" is 265% brighter in SDR (1364 vs 374 nits), a noticeable difference for outdoor readability. HDR peak: 5000 vs 677 nits.
Key Differences
| Specification | LG B4 55" | TCL QM8 75" |
|---|---|---|
| Pixel Density (PPI) | 80 | 59 |
| Optimal Viewing Distance | 1.1m | 1.5m |
| Response Time | 0.1 ms GTG | 3 ms GTG |
| Contrast Ratio | 1:1,000,000 | 1:5,000 |
| Color Gamut | sRGB 100% · DCI-P3 99% · Adobe RGB 97% | sRGB 100% · DCI-P3 97% · Adobe RGB 90% |
| Screen Size | 55" | 75" |
| SDR Brightness | 374 nits | 1364 nits |
| HDR Peak Brightness | 677 nits | 5000 nits |
All specifications
| Specification | LG B4 55" 2024 | TCL QM8 75" 2024 |
|---|---|---|
| Screen Size | 55" | 75" (Better) |
| Resolution | 3840×2160 | 3840×2160 |
| Pixel Density (PPI) | 80 (Better) | 59 |
| Optimal Viewing Distance | 1.1m (Better) | 1.5m |
| Panel Type | OLED | Mini-LED |
| Viewing Angle | 178° | 178° |
| Aspect Ratio | 16:9 | 16:9 |
| Refresh Rate | 120 Hz | 120 Hz |
| Variable Refresh Rate (VRR) | FreeSync Premium | FreeSync Premium Pro |
| Response Time | 0.1 ms GTG (Better) | 3 ms GTG |
| HDR Certification | None | None |
| SDR Brightness | 374 nits | 1364 nits (Better) |
| HDR Peak Brightness | 677 nits | 5000 nits (Better) |
| Contrast Ratio | 1:1,000,000 (Better) | 1:5,000 |
| Ports | 4x HDMI | 4x HDMI |
| Color Gamut | sRGB 100% · DCI-P3 99% · Adobe RGB 97% (Better) | sRGB 100% · DCI-P3 97% · Adobe RGB 90% |
| Year | 2024 | 2024 |
Frequently Asked Questions
Which has better PPI: LG B4 55" or TCL QM8 75"?
The LG B4 55" has 80 PPI compared to 59 PPI for the TCL QM8 75".
Which has a closer optimal viewing distance?
The LG B4 55" requires 1.1m vs 1.5m for the TCL QM8 75" to reach retina quality.
Related Comparisons
Hisense U7N 75" 2024 · 59 PPI · 75" · 144 Hz
vs LG B4 55" 2024 · 80 PPI · 55" · 120 Hz
Hisense U7N 75" 2024 · 59 PPI · 75" · 144 Hz
vs TCL QM8 75" 2024 · 59 PPI · 75" · 120 Hz
Hisense U8N 55" 2024 · 80 PPI · 55" · 144 Hz
vs LG B4 55" 2024 · 80 PPI · 55" · 120 Hz
Hisense U8N 55" 2024 · 80 PPI · 55" · 144 Hz
vs TCL QM8 75" 2024 · 59 PPI · 75" · 120 Hz
Methodology & Sources
Formula: Retina distance (cm) = 3438 / PPI. Displayed values are rounded for readability.
Sources: Official manufacturer spec sheets and product pages. Specs are normalized before comparisons.
Comparison winners are calculated metric by metric (higher is better for most specs; lower is better for distance/response time).
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