Overcoming Motion Blur Caused by Head Movement in VR Experience with Lumicore's Solution Regarding Motion Blur

Time:2024-05-08 11:15:05


Motion blur is commonly present in scenes related to motion. For example, when capturing images of a rapidly moving vehicle, the resulting image may exhibit motion blur. Motion blur is not always detrimental. In certain situations, moderate motion blur can make an image appear more realistic and lively. For instance, in photography, motion blur can simulate the trajectory of an object, making it appear as if it is truly in motion. In film production, motion blur is also frequently used as a visual effect. 

However, more motion blur is not necessarily better. Excessive motion blur can make the image unclear, lacking in detail, and impact visual perception. Therefore, it is necessary to strike a balance between realism and clarity. Ultimately, whether to utilize motion blur in scenarios such as photography or film production depends on the desired effects and goals of the creator. VR experiences, on the other hand, are similar yet distinct in this regard.

In current VR experiences, the main factor affecting the duration of wearing is dizziness, with motion blur being a major cause. Motion blur primarily occurs during head movement, when the display screen retains the same image for too long. To enhance user experience, VR manufacturers typically need to utilize technology to address the motion blur caused by head movement.

Resolving Motion Blur

One common technique to address motion blur is by employing black frame insertion. Black frame insertion is widely used in traditional displays like LCDs and analog-driven silicon-based OLEDs. Typically, the ratio of on (lit) to off (black) time in a frame is 20% on and 80% off. In early VR displays, the on and off times were evenly split at 50% each. To further reduce motion blur, it is preferable for VR displays to have a ratio of on to off time during black frame insertion of less than 10% on and 90% off. However, shorter on times increase the demand for the display's maximum brightness. 

For example, if no black frame insertion is utilized, a display only needs to achieve a brightness level of 1000 nits. But if the on and off times are split at 20% on and 80% off per frame, the display's brightness requirement would increase to 5000 nits. Inserting a black frame between each frame may also result in screen flickering, compromising the user experience and potentially harming the eyes.

Lumicore's solution has achieved surprisingly good results in controlling motion blur. The FSL technology employs a digital driving scheme which inherently optimizes motion blur.

Digital driving divides each frame into multiple sub-frames for individual processing. Except for solid-colored frames, the data for each sub-frame is unique. The display time for each sub-frame is very short, well below the perceptible threshold of the human eye, thereby rendering any motion blur generated by each sub-frame negligible.

By splitting a frame into multiple sub-frames with different data and continuously displaying them with extremely short durations, digital driving eliminates motion blur caused by prolonged image retention on traditional displays. A significant portion of the sub-frames during the subdivision are low luminance, further minimizing the impact of motion blur.

Using innovative technology, Lumicore's 1.32-inch micro-OLED display for VR demonstrates the remarkable feature of motion blur-free performance, providing a refreshing user experience.