Screen door effect, distortions, resolution, field of view
The most challenging issue in AR/VR displays today is the Screen Door Effect – a visual effect caused by the projection technology that makes the thin lines of separation between pixels visible. This effect is a real problem with VR headsets because of the eye-screen distance and the wider field of view.
The VCProbe-AR/VR-MTF is specifically designed to measure both screen resolution and distortion in virtual reality headsets. The high-resolution camera allows for the calculation of the Modulation Transfer Function (MTF) response of the display to evaluate its ability to render fine details. By comparing different areas of the screen, variations in sharpness can be detected.
With the VCProbe-AR/VR-MTF the display structure is examined at a sub-pixel level, enabling the detection of resolution variations across the pixels.
Chromaticity, brightness, uniformity, mura effect
Why it is important to evaluate the colorimetry on AR/VR displays?
Accurate colour representation is critical for AR/VR displays and serves several purposes:
- Accurate colour measurement reduces eye strain during prolonged AR/VR use. Correctly measured and displayed colours increase comfort
- Accurate colour ensures a realistic and immersive experience for users interacting with digital environments. Incorrect or variable colours can disrupt immersion, as the slightest difference in colour reproduction between the two eyes is highly noticeable to the user
- Consistent colour across devices and applications is essential to build user trust and satisfaction
AR/VR displays, as near-eye displays, present a significant challenge in avoiding defects. The proximity of the eye to the display amplifies even the smallest imperfections, making quality control a challenging task.
The VCProbe-AR/VR-Color evaluates the colorimetry of AR/VR displays, analysing the luminance and visible colour perceived by our eyes to detect potential defects in the display. Thanks to the colorimetry results, the colour gamut and luminance profile can be obtained, and any display defects due to internal light leakage can be identified.
Polarisation states map for pancake lenses
Pancake lenses are incredibly compact, making them ideal for AR/VR devices. However, their design can cause internal reflections, and as light rays bounce around inside the lens they often create a “ghost” effect.
To prevent the appearance of these ghosts, Eldim have developed a state-of-the-art conoscope capable of generating a full polarisation map of the lenses in less than 10 seconds.
The VCProbe-AR/VR-Polar is designed to examine the polarisation states of optical components. Its ability to evaluate the effects of variable angles of incidence on uniformly distributed materials and to visualise polarisation states of VR lenses sets a new standard in optical analysis.
This instrument is essential for evaluating AR/VR pancake lenses by measuring these critical characteristics:
- Ellipticity
- Transmittance
- Polarisation Degree
- Orientation
