Display with replacement electrodes within pixel array for enhanced current spread
US11764331B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 3, 2021 |
| Grant date | Sep 19, 2023 |
| Priority date | — |
| Expiry date | Oct 14, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/032
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a flip-chip LED assembly having an array of LEDs formed on the same substrate, different LEDs of the array have different distances to the n-contacts of the assembly. This may cause current crowding as current has to spread from the n-contacts through the substrate to each the farthest LEDs of the LED array, requiring LEDs that are farther away to be driven with a higher voltage in order to receive a desired amount of current. To spread current more evenly through the LED assembly and reduce a voltage difference between the closest and farthest LEDs of the array, one or more additional n-contacts are formed within the LED array. In some embodiments, the n-contacts may replace a pixel of the LED array. In other embodiments, one or more p-contacts of the LED array are resized or repositioned to accommodate the additional n-contacts without sacrificing pixels of the LED array.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.