The most common application of OLED micro displays is in head-mounted displays (HMD). The display is seen via an eyepiece lens which affords the eye a relaxed view and presents the display as enlarged.
Applications in medicine, and in particular neurology, place special demands on HMDs. Here, HMDs are used to present visual stimuli to patients. Changes in brain activity triggered can be observed using magnetic resonance tomography.
An HMD used in a tomograph may neither be influenced by strong magnetic fields nor influence the magnetic field itself.
Together with the Norwegian company NordicNeuroLab, the optics for a system of this kind were developed at Fraunhofer IOF.
The use of two separate optical channels enables the presentation of stereoscopic images. In addition to the function as an eyepiece lens, the developed system simultaneously enables the viewer’s eye position to be tracked. It is then possible to evaluate which image the test person is concentrating on.
- RGB OLED micro display 12.78 x 9.00 mm², 852 x 600 pixels
- Eyepiece lens FOV 30° x 22.5°
- Eye tracker FOV ∅ 20mm
- Dimensions of an eyepiece lens below 32mm ( ∅ ) * 100mm (L)
- Design, development and realization of customized optical systems
- Micro display applications (OLED, LCOS, DLP)