US 11,942,034 B2
Pixel driver redundancy schemes
Hjalmar Edzer Ayco Huitema, Lexington, MA (US); Hopil Bae, Sunnyvale, CA (US); Kapil V. Sakariya, Los Altos, CA (US); Mahdi Farrokh Baroughi, Santa Clara, CA (US); Stanley B. Wang, Cupertino, CA (US); and Tore Nauta, Santa Cruz, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Appl. No. 17/905,411
Filed by Apple Inc., Cupertino, CA (US)
PCT Filed Feb. 23, 2021, PCT No. PCT/US2021/019271
§ 371(c)(1), (2) Date Aug. 31, 2022,
PCT Pub. No. WO2021/202015, PCT Pub. Date Oct. 7, 2021.
Claims priority of provisional application 63/002,905, filed on Mar. 31, 2020.
Prior Publication US 2023/0162677 A1, May 25, 2023
Int. Cl. G09G 3/3233 (2016.01); G09G 3/3266 (2016.01)
CPC G09G 3/3233 (2013.01) [G09G 3/3266 (2013.01); G09G 2300/0866 (2013.01); G09G 2310/0275 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A display panel comprising:
an array of pixel driver chips connected to a corresponding array of LED matrices, the array of LED matrices including a first LED matrix, and the array of pixel driver chips including a first pixel driver chip connected to the first LED matrix;
wherein the first LED matrix includes a plurality of first primary strings of LEDs and a plurality of first redundant strings of LEDs;
wherein the first pixel driver chip includes a corresponding plurality of first primary driver terminals coupled with the plurality of first primary strings of LEDs and a corresponding plurality of first redundant driver terminals coupled with the plurality of first redundant strings of LEDs; and
wherein the first pixel driver chip includes a first portion of pixel driver circuitry comprising:
a first group of first output drivers; and
a first group of first driver terminal switches;
wherein each first output driver is connected to a corresponding first driver terminal switch that switches between a first primary driver terminal and a first redundant driver terminal to select either the first primary driver terminal or the first redundant driver terminal of the first pixel driver chip.