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US 12,183,285 B2Granted
Pixel driver redundancy schemes
AssigneeApple Inc.
InventorsHjalmar Edzer Ayco Huitema, Hopil Bae, Kapil V. Sakariya, Mahdi Farrokh Baroughi, Stanley B. Wang, Tore Nauta
Life of this patent
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Abstract
Display panel redundancy schemes and redundancy building blocks are described. In an embodiment, pixel driver chips are connected to both primary and redundant strings of LEDs within a local passive matrix, and driver terminal switches within the pixel driver chip are used to select either the primary or redundant strings of LEDs.
Claims20
A pixel driver chip comprising:
- a plurality of first primary driver terminals and a corresponding plurality of first redundant driver terminals;
- a first portion of pixel driver circuitry comprising a first group of first output drivers, each first output driver connected to a first selection circuit switch that is followed by a first driver terminal switch, wherein each first driver terminal switch switches between a first primary driver terminal and a first redundant driver terminal;
- and
- a redundancy circuit coupled with the first portion of pixel driver circuitry, the redundancy circuit including a group of redundant output drivers, each redundant output driver connected to a first redundancy circuit selection switch arranged between the first selection circuit switch and the first driver terminal switch.
1 more element
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 LED matrix includes a plurality of first row interconnects connected to a plurality of first row terminals of the first pixel driver chip, each first row interconnect coupled to both the plurality of first redundant strings of LEDs and the plurality of first primary strings of LEDs in the first LED matrix.
2 more elements
Dependencies are inferred from the claim text.