The Samsung Galaxy S21 Ultra (model SM-G998 series) originally features a Dynamic AMOLED 2X display, not a traditional LCD. Many replacement screens sold as "LCD complete screen" are actually TFT LCD aftermarket panels (cheaper alternatives to OLED/AMOLED) or refurbished/remanufactured AMOLED units. These come as a "complete screen" assembly, which typically includes the display panel, digitizer (touch layer), adhesive, and often the metal/plastic frame (mid-frame) for easier installation.
In the mobile repair market (especially on platforms like AliExpress, eBay, Amazon, or wholesale sites), Grade B refers to the cosmetic and quality condition of the replacement screen assembly:
Grade B is popular for cost-effective repairs because it balances price and performance while still looking decent after installation. Always check seller photos and descriptions for specifics, as grading can vary slightly between suppliers.
In the mobile repair market (especially on platforms like AliExpress, eBay, Amazon, or wholesale sites), Grade B refers to the cosmetic and quality condition of the replacement screen assembly:
Grade B is popular for cost-effective repairs because it balances price and performance while still looking decent after installation. Always check seller photos and descriptions for specifics, as grading can vary slightly between suppliers.
Replacements aim to match the original as closely as possible, but quality varies (especially TFT LCD versions):
| Feature | Original S21 Ultra Display | Typical Grade B Replacement (LCD/TFT or OLED) |
|---|---|---|
| Screen Size | 6.8 inches (full rectangle; ~6.6" viewable) | 6.8 inches (or listed as 6.66–6.8") |
| Type | Dynamic AMOLED 2X (OLED) | TFT LCD (common) or Refurbished AMOLED/OLED |
| Resolution | 1440 x 3200 pixels (QHD+), ~515 ppi | 1440 x 3200 (or lower like FHD+ in cheap TFT) |
| Refresh Rate | Adaptive 10–120Hz | 60Hz or 120Hz (depends on unit; many TFT are 60Hz) |
| Brightness | Up to 1500 nits (peak), HDR10+ | Lower (500–1000 nits typical for replacements) |
| Contrast & Colors | Excellent (3,000,000:1 ratio), vivid | Good but inferior to original AMOLED (less deep blacks, color shift possible) |
| Protection | Corning Gorilla Glass Victus | Tempered glass or similar (varies) |
| Other | Eye Comfort Shield, curved edges, in-display ultrasonic fingerprint | May lack full HDR, variable refresh, or fingerprint compatibility |
Important Notes:
If you're buying one, verify the exact model (e.g., for G998B international version) and whether it includes the frame. For professional repair, Samsung authorized service centers offer genuine replacements at higher cost. Let me know if you need help with installation tips or where to buy!
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