公开(公告)号：US12236917B2

公开(公告)日：2025-02-25

申请号：US18067267

申请日：2022-12-16

Applicant: GOOGLE LLC

Inventor： Bo Li ,  Kaushik Sheth

IPC: G09G3/36

Abstract: A display system comprising a plurality of display controller circuits controlling a like number of independent segments of pixel drive circuits of a backplane. Each pixel drive circuit comprises a memory element and associated pixel drive circuitry. The segments of the backplane may be organized vertically. The word line for the memory cells of a first segment of pixel drive circuits passes underneath a second segment of pixel drive circuits without directly interacting with the pixel drive circuits of the second segment in order to reach the pixel drive circuits of the first segment. The plurality of display controller circuits operate asynchronously but are kept at the same frame rate by an external signal such as Vsync.

公开(公告)号：US20230147106A1

公开(公告)日：2023-05-11

申请号：US18150724

申请日：2023-01-05

Applicant: GOOGLE LLC

Inventor： Bo Li ,  Kaushik Sheth ,  Edwin Lyle Hudson

IPC: G09G3/36

CPC classification number: G09G3/3688 ,  G09G2360/12

Abstract: A backplane design for delivering image data in an efficient manner to a memory cell forming a part of a pixel driver comprises a word line design and a column data register release signal delivery design that are speed matched and a complementary bit line delivery design that is speed matched to a row decoder signal circuit operative to pull a word line driver to a state to enable the memory circuits of that row to receive data from the column drivers for each column. The speed matching is effective over a range of operating temperatures because the circuit designs are substantially identical.

公开(公告)号：US11538431B2

公开(公告)日：2022-12-27

申请号：US17354419

申请日：2021-06-22

Applicant: Google LLC

Inventor： Bo Li ,  Kaushik Sheth

IPC: G09G3/30 ,  G09G3/36

Abstract: A display system comprising a plurality of display controller circuits controlling a like number of independent segments of pixel drive circuits of a backplane. Each pixel drive circuit comprises a memory element and associated pixel drive circuitry. The segments of the backplane may be organized vertically. The word line for the memory cells of a first segment of pixel drive circuits passes underneath a second segment of pixel drive circuits without directly interacting with the pixel drive circuits of the second segment in order to reach the pixel drive circuits of the first segment. The plurality of display controller circuits operate asynchronously but are kept at the same frame rate by an external signal such as Vsync.

公开(公告)号：US11568802B2

公开(公告)日：2023-01-31

申请号：US17584668

申请日：2022-01-26

Applicant: Google LLC

Inventor： Bo Li ,  Kaushik Sheth

IPC: G09G3/32

Abstract: A backplane suitable to pulse width modulate an array of emissive pixels with a current that is substantially constant over a wide range of temperatures. A current control circuit provides means to provide a constant current to an array of current mirror pixel drive elements. The current control circuit comprises a thermally stable bias resistor and a thermally stable band-gap voltage source to provide thermally stable controls and a large L p-channel reference current FET with an associated large L n-channel bias FET configured to provide a reference current at a required voltage to the gate of a large L p-channel current source FET. The current control circuit and the current mirror pixel drive elements are similar circuits with one current control circuit able to control a substantial number of pixel drive elements.

公开(公告)号：US20230197029A1

公开(公告)日：2023-06-22

申请号：US18067267

申请日：2022-12-16

Applicant: GOOGLE LLC

Inventor： Bo Li ,  Kaushik Sheth

IPC: G09G3/36

CPC classification number: G09G3/3688 ,  G09G2360/12

Abstract: A display system comprising a plurality of display controller circuits controlling a like number of independent segments of pixel drive circuits of a backplane. Each pixel drive circuit comprises a memory element and associated pixel drive circuitry. The segments of the backplane may be organized vertically. The word line for the memory cells of a first segment of pixel drive circuits passes underneath a second segment of pixel drive circuits without directly interacting with the pixel drive circuits of the second segment in order to reach the pixel drive circuits of the first segment. The plurality of display controller circuits operate asynchronously but are kept at the same frame rate by an external signal such as Vsync.