2025-02-08
During the interactive experience of XR devices, the display acts as a light source in the interactive environment. Eye protection requirements arise from this.
Traditional techniques use black insertion technology to reduce motion blur, such as using 20% PWM black insertion. Within one frame of time, the proportion of bright time is 20%, the proportion of off time is 80%, and most of the time is in an off state. In order to reduce motion blur, many XR systems will continue to increase the proportion of display off time, resulting in more severe screen flickering and causing harm to the human eye.
According to the internationally recognized "LED Light Source Strobe Risk and Hazard Assessment Criteria" (IEEE Std 1789) ™- When the flicker frequency of the monitor is less than 1250Hz, it is very easy to cause harm to the human eye. When it is greater than 1250Hz and less than 3125Hz, the risk of harm to the human eye is low. Only when it reaches 3125Hz or above can the monitor flicker not cause harm to the human eye and reach a zero risk state.
The existing black insertion technology usually causes flicker at only 90 to 120Hz, which can cause harm to the human eye if used for a long time. The digital driving technology has achieved a refresh rate of over 3600Hz, achieving a green eye protection state.
