Multi-functional active matrix organic light-emitting diode display
A multi-functional active matrix display comprises a transparent front sheet, a semi-transparent layer of light emissive devices adjacent the rear side of the front sheet and forming a matrix of display pixels, and a solar cell layer located behind the light emissive devices for converting both ambient light and internal light7 from the light emissive devices into electrical energy, the solar cell layer including an array of electrodes on the front surface of the solar cell layer for use in detecting the location of a change in the amount of light impinging on a portion of the front surface of the solar cell layer.
1. A multi-functional active matrix display comprising
a transparent front sheet,
a semi-transparent layer of light emissive devices adjacent the rear side of said front sheet and forming a matrix of display pixels for displaying images for viewing through said front sheet,
a solar panel located behind said light emissive devices for converting both ambient light and light from said light emissive devices into electrical energy, said solar panel including an array of electrodes on at least the front surface of said solar panel for use in detecting the location of a change in the amount of light impinging on a portion of the front surface of said solar panel due to an object in front of said front sheet reflecting light from said emissive devices back through said front sheet and said emissive devices to said solar panel.
2. The multi-functional active matrix display of claim 1 in which said semi-transparent layer of light emissive devices includes a substantially transparent anode adjacent said front sheet, a semi-transparent semiconductor stack forming organic light emitting diodes adjacent the rear side of said anode, a semi-transparent cathode adjacent the rear side of said semiconductor stack, a cover glass spaced rearwardly of said cathode and covering said solar panel, and a peripheral sealant bonding said cover glass to said transparent front sheet.
3. The multi-functional active matrix display of claim 2 in which said peripheral sealant holds said cover glass spaced away from the rear side of said cathode to form an air gap between said cathode and said cover glass.
4. The multi-functional active matrix display of claim 1 in which said transparent front sheet is a glass substrate for said semi-transparent layer of light emissive devices.
5. The multi-functional active matrix display of claim 1 in which said solar panel includes laminated N-type and P-type semiconductor materials, and said array of electrodes includes multiple electrode segments located on the front surface of said semiconductor laminate and spaced from each other to allow both ambient light and light from said light emissive devices to impinge on said semiconductor laminate.
6. The multi-functional active matrix display of claim 5 in which said array of electrodes includes first spaced electrode segments running in a first direction on one surface of said semiconductor laminate, and second spaced electrode segments running in a second direction on the opposite surface of said semiconductor laminate.
7. The multi-functional active matrix display of claim 1 in which said semi-transparent layer of light emissive devices includes a substantially transparent anode and a semi-transparent cathode.