Display with embedded pixel driver chips
Embodiments describe a display integration scheme in which an array of pixel driver chips embedded front side up in an insulator layer. A front side redistribution layer (RDL) spans across and is in electrical connection with the front sides of the array of pixel driver chips, and an array of light emitting diodes (LEDs) is bonded to the front side RDL. The pixel driver chips may be located directly beneath the display area of the display panel.
1. A display panel comprising:
an array of pixel driver chips embedded front side up in an insulator layer;
a front side redistribution layer (RDL) spanning across and in electrical connection with front sides of the array of pixel driver chips, wherein the front side RDL includes data routing connected to the array of pixel driver chips; and
an array of light emitting diodes (LEDs) on the front side RDL;
wherein each pixel driver chip is to switch and drive a corresponding group of LEDs in the array of LEDs;
a back side RDL spanning across the insulator layer and the array of pixel driver chips; and
a flex circuit attached to the back side RDL.
2. The display panel of claim 1 , wherein the front side RDL includes a plurality of dielectric layers and a plurality of redistribution lines.
3. The display panel of claim 1 , wherein the front side RDL includes data clock routing connected to the array of pixel driver chips.
4. The display panel of claim 3 , wherein the front side RDL includes grey level clock routing connected to the array of pixel driver chips.
5. The display panel of claim 1 , further comprising electrical connections extending through the insulator layer between the back side RDL and the front side RDL.
6. The display panel of claim 5 , wherein the electrical connections comprise copper pillars.
7. The display panel of claim 1 , wherein the back side RDL includes one or more redistribution lines and one or more dielectric layers.
8. The display panel of claim 1 , wherein each LED is formed of an inorganic semiconductor-based material.
9. The display panel of claim 1 , wherein each LED has a maximum lateral dimension of 1 to 300 gm.
10. The display panel of claim 1 , wherein each LED has a maximum lateral dimension of 1 to 20 gm.
11. The display panel of claim 1 , further comprising a passivation layer laterally surrounding each LED of the array of LEDs.
12. The display panel of claim 11 , further comprising a plurality of transparent top conductive contact layers formed over the passivation layer and the array of LEDs to make electrical contact with the array of LEDs.
13. The display panel of claim 12 , further comprising a plurality of openings in the passivation layer for the plurality of transparent conductive contact layers to contact the front side RDL.
14. The display panel of claim 1 , wherein the insulator layer comprises a thermoset resin.
15. The display panel of claim 1 , wherein each pixel driver chip is directly beneath a display area of the display panel.
16. The display panel of claim 15 , wherein the display panel is folded.
17. The display panel of claim 15 , wherein the array of LEDs is closer to a plurality of edges of the display panel than the array of pixel driver chips.
18. The display panel of claim 15 , integrated into a mobile electronic device.
19. The display panel of claim 15 , integrated into a wearable electronic device.