Miniaturised projection device using an led array and dichroic wedge
OwnerPeter Rubinshtein, Danny Junginventors
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Abstract
The present invention relates to an image projection device having a linear array of LED's in a common substrate, a common lens group to collimate light from each LED, and a single dichroic wedge having dichroic coatings for reflecting each light source to a condensing means which condenses the light to a distal surface. The image projection device therefore provides for a smaller optical package which is more easily accommodated in mobile devices such as mobile telephones, and which is simple and cheap to manufacture.
Claims17
1-16. (canceled)
A mobile device such as a mobile telephone, including an inbuilt image projection device as characterised in claim 17.
An image projection device characterised by:
- at least two light sources of different wavelength;
- a means of collimating light from each of said at least two light sources;
- a dichroic wedge having a plurality of reflective surfaces, whereby each reflective surface is adapted to reflect light from each one of the collimated light sources in the same direction;
- and
- a means of condensing light reflected from the dichroic wedge to a distal surface.
An image projection device characterised by:
- a blue, green and red light emitting diode arranged in a linear array on a common substrate;
- a single collimating lens group adapted to collimate light from each of the light emitting diodes;
- a wedge having three dichroic coatings arranged to reflect said collimated light from each of the light emitting diodes in the same direction;
- at least one condensing lens for condensing light reflected from the wedge to a distal surface;
- a light modulator such as a LCD panel illuminated with light from said at least one condensing lens;
- and
- objective and projection lenses positioned between the light modulator and the distal surface.
Dependencies are inferred from the claim text.