OLED device with embedded chip driving
View Patent ↗An electroluminescent device having a plurality of current driven pixels arranged in rows and columns, such that when current is provided to a pixel it produces light, including each pixel having first and second electrodes and current responsive electroluminescent media disposed between the first and second electrodes; at least one chiplet having a thickness less than 20 micrometers; including transistor drive circuitry for controlling the operation of at least four pixels, the chiplet being mounted on a substrate and having connection pads; a planarization layer disposed over at least a portion of the chiplet; a first conductive layer over the planarization layer and connected to at least one of the connection pads; and a structure for providing electrical signals through the first conductive layer and at least one of the connection pads of the chiplet so that the transistor drive circuitry of the chiplet controls current to the four pixels.
1. An electroluminescent device having a plurality of current driven pixels arranged in rows and columns disposed over a substrate, such that when current is provided to a pixel it produces light, comprising:
(a) each pixel having first and second electrodes and a current responsive electroluminescent media disposed between the first and second electrodes;
(b) at least one chiplet having a thickness less than 20 micrometers and including transistor drive circuitry for controlling the operation of at least four pixels, the chiplet being mounted on the substrate and having connection pads;
(c) a planarization layer disposed over at least a portion of the chiplet;
(d) a first conductive layer disposed over the planarization layer and connected to at least one of the connection pads of the chiplet; and
(e) means for providing electrical signals through the first conductive layer and at least one of the connection pads of the chiplet so that the transistor drive circuitry of the chiplet controls current to the four pixels.
2. The electroluminescent device of claim l, wherein the first electrode is formed in a second conductive layer that is different than the first conductive layer.
3. The electroluminescent device of claim 2 , further includes an insulator layer disposed between at least a portion of the first electrode and the first conductive layer.
4. The electroluminescent device of claim 2 , wherein the first electrode is connected to the chiplet by the first conductive layer.
5. The electroluminescent device of claim 1 , wherein the first electrode is formed in the first conductive layer.
6. The electroluminescent device of claim 1 , wherein the chiplet is attached to the substrate by an adhesive layer, and the adhesive layer and the planarization layer have the same refractive index.
7. The electroluminescent device of claim 1 , further includes a power supply line, one or more data signal lines, and one or more select lines which are formed in the first conductive layer and connected to corresponding connection pads on the chiplet.
8. The electroluminescent device of claim 7 , wherein the chiplet further comprises an electrical pass-thru connection, and wherein either the select line or data signal line is discontinuous and connected to the electrical pass-thru connection in the chiplet.
9. The electroluminescent device of claim 1 , wherein the chiplet has a width and a length that is greater than the width, and the connection pads of the chiplet are arranged in a first and second row along the direction of the length.
10. The electroluminescent device of claim 9 , further includes a signal line which is discontinuous and connected to the first and last connection pads in each row of connection pads of the chiplet.
11. The electroluminescent device of claim 1 , wherein the at least four pixels controlled by the chiplet have different colors.
12. The electroluminescent device of claim 11 , wherein the at least four pixels controlled by the chiplet are red, green, blue, and white.
13. The electroluminescent device of claim 1 , wherein the transistor drive circuitry of each chiplet includes a first driving transistor having a first channel ratio for controlling a first pixel, and a second driving transistor having a second channel ratio for controlling a second pixel, where the first pixel has a different color than the second pixel, and the first channel ratio is different than the second channel ratio.
14. The electroluminescent device of claim 1 , wherein the chiplet controls a plurality of pixels N of a first color and a plurality of pixels M of a second color different than the first color where N is that same as M and is an integer equal to 2 or more.
15. The electroluminescent device of claim 1 , wherein the chiplet has a width and a length that is greater than the width, and includes power line arranged parallel to the width of the chiplet.
16. The electroluminescent device of claim 15 , wherein the power line is disposed over the center of the chiplet.
17. The electroluminescent device of claim 1 , further includes a color filter disposed under the planarization layer.