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 method of managing energy in an active matrix OLED display, the method comprising:
integrating the OLED display with a solar panel located behind the OLED display, the solar panel converting light emitted from the OLED display into electrical energy; and
storing the electrical energy in electrical energy storage coupled to the solar panel.
2. A method of correcting non-uniformities of an active matrix OLED display, the method comprising:
integrating the OLED display with a solar panel located behind the OLED display, the solar panel including an array of electrodes on at least one surface of said solar panel for generating output signals corresponding to light emissions from various areas across the OLED display;
detecting non-uniformities in the OLED display from said output signals; and
correcting the detected non-uniformities in the OLED display.
3. An 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, and
a solar panel located behind said light emissive devices, said solar panel including an array of electrodes on at least one surface of said solar panel for generating output signals corresponding to light emissions from various light emissive devices across the matrix of display pixels for use in detecting and correcting non-uniformities in the active matrix display.
4. The active matrix display of claim 3 further comprising:
a detection circuit for the detecting of the non-uniformities in the active matrix display from said output signals; and
a correction circuit for the correcting the detected non-uniformities in the active matrix display.
5. The active matrix display of claim 3 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.
6. The active matrix display of claim 5 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.
7. The active matrix display of claim 3 in which said transparent front sheet is a glass substrate for said semi-transparent layer of light emissive devices.
8. The active matrix display of claim 3 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 light from said light emissive devices to impinge on said semiconductor laminate.
9. The active matrix display of claim 8 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.
10. The active matrix display of claim 3 in which said semi-transparent layer of light emissive devices includes a substantially transparent anode and a semi-transparent cathode.
11. The active matrix display of claim 3 wherein the electrodes on the at least one surface of the solar panel generates the output signals 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.
12. The active matrix display of claim 11 further comprising: a touch screen circuit coupled to said solar panel for receiving said output signals from said array of electrodes and for detecting the location of said change in the amount of light with use of said output signals.
13. The active matrix display of claim 3 , wherein the solar panel located behind said light emissive devices converts light emitted from said light emissive devices into electrical energy, the active matrix display further comprising electrical energy storage coupled to the solar panel for storing said electrical energy.
14. The active matrix display of claim 3 , wherein the solar panel comprises a plurality of solar cell units, each solar cell unit representing one or more pixels or sub-pixels.
15. The active matrix display of claim 14 , wherein each solar cell unit is calibrated at different color and brightness levels, and the resulting values are stored in a lookup table for use in the detecting and the correcting the non-uniformities in the active matrix display.