Refresh rate 60Hz 90Hz 120Hz: differences in LTPS In-Cell LCD display vs OLED, for iPhone & Android Consumption and Temperature

Published the 29.08.2025

DISPLAY REFRESH RATE: 60Hz, 80Hz, 90Hz, 120Hz
LTPS In-Cell vs OLED on smartphones: smoothness, power and heat

If you are considering replacing your smartphone display, the refresh rate (60/80/90/120Hz) directly affects smoothness, power consumption, and temperature. In LTPS In-Cell panels (with backlight), higher Hz may result in higher perceived heat than OLED (self-emitting pixels). This guide explains the main differences, pros and cons, and offers practical tips for choosing the best display for your needs.

At a glance
- 60Hz: low consumption and stable temperature.
- 80/90Hz: smoother scrolling with moderate heat increase.
- 120Hz: maximum responsiveness; on LTPS more heat under load.

LTPS In-Cell vs OLED
- LTPS In-Cell: requires backlight; excellent performance but generates more heat when CPU/GPU and backlight work harder (e.g. at 90/120Hz).
- OLED (Hard/Soft/AMOLED): self-emitting pixels (no backlight); generally more efficient with lower surface temperature.

Why a warm LTPS display is not a defect
The compact In-Cell structure concentrates heat near the surface. With high refresh rate and intensive use (gaming, video, GPS, 5G), the phone may trigger protections such as dimming, slowdowns, or charging pause. This behavior is normal and part of the technology design.

Factors that increase temperature
- Hot environment or direct sunlight (e.g. inside a car).
- Charging while using demanding apps.
- Heavy network or graphics load.
- Fixed 90/120Hz mode enabled.

Temperature thresholds and iPhone protections

Apple devices feature automatic protection systems that activate when internal temperature rises above specific thresholds. These values explain why overheating alerts are expected behavior, not defects.

Internal temperature	Device behavior
40–45 °C	Performance may slow; display brightness reduces.
50 °C+	High-temperature warning appears; charging and flash may stop.
60 °C+	Automatic shutdown to prevent damage.

Common scenarios

Charging: paused if battery exceeds 45 °C.
Heavy use (gaming, rendering, 5G): alerts over 50 °C.
Hot environment (car in sunlight >50 °C): protections activate faster.

Practical tips for technicians and users
- Inform customers that high-refresh LTPS may get warmer under stress.
- Choose OLED (Hard/Soft) for thermal behavior closer to original displays.
- Avoid extreme heat: limit use in >35 °C, remove thick cases during gaming/charging, reduce Hz when possible.
- If you see “Charging on hold”, let the device cool — it’s a protection mechanism.

FAQ
Is LTPS overheating a quality issue?
No, it’s a technical characteristic.

Switching from OLED to LTPS In-Cell makes devices warmer?
Yes, especially at 90/120Hz under heavy use.

Recommended iPhone operating range?
Generally 0–35 °C; beyond this range, automatic protection activates.

Further reading
1) TFT “Thin Film Transistor LCD”
2) INCELL “In-Cell Display”
3) IPS “In-Plane Switching”
4) Hard OLED “Organic LED”
5) Soft OLED “Organic LED”
6) AMOLED “Active Matrix OLED”

Need help choosing the right replacement? Contact Componenti Digitali — our team will guide you to the ideal display for your daily use.