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# Rotating or Vibrating Mirror LED Display

IP.com Disclosure Number: IPCOM000088547D
Original Publication Date: 1977-Jun-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 46K

IBM

## Related People

Reich, HA: AUTHOR

## Abstract

One of the problems with ROLED (rotating optical light-emitting diode) displays resides in the apparent curvature of the image field. Described is a technique that may be utilized to reduce the apparent curvature. Basically, the technique involves pivoting the mirror about an axis not in the plane of the mirror.

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Rotating or Vibrating Mirror LED Display

One of the problems with ROLED (rotating optical light-emitting diode) displays resides in the apparent curvature of the image field. Described is a technique that may be utilized to reduce the apparent curvature. Basically, the technique involves pivoting the mirror about an axis not in the plane of the mirror.

Fig. 1A shows an existing approach wherein the axis of rotation of the mirror coincides with the plane of the mirror. As shown, the object-image distance is equal to 2R, the image plane radius is equal to R, and the object-mirror distance is equal to R.

In the proposed arrangement (Fig. 1B), the axis of rotation of the mirror is outside the plane of the mirror. For example, the axis of rotation of the mirror may be in front of the mirror at the object, as shown in Fig. 1B. By such an arrangement, the object-mirror distance is equal to r, the mirror-image distance is equal to 2r = R, and the image plane radius is equal to R = 2r (for this case). In this regard, intermediate values give intermediate R's. This technique permits an increase in the radius of curvature of the ROLED display without increasing the depth of the image field or physical size of the display unit.

Fig. 2 shows a simulation of the manner in which the image plane varies as a function of the location of the axis of rotation of the mirror. As shown by the plotted values, the radius of curvature increases as the axis of rotation moves further away f...