The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 01, 2022
Filed:
Jun. 29, 2020
Jasper Display Corp., Hsinchu, TW;
Edwin Lyle Hudson, Santa Clara, CA (US);
Bo Li, Santa Clara, CA (US);
JASPER DISPLAY CORP., Hsinchu, TW;
Abstract
A backplane operative to drive an array of emissive pixel elements is disclosed. Each pixel element comprises a memory cell operative to modulate a plurality of current mirror drive elements configured to drive one emissive element, wherein one current mirror pixel drive element is always operative to provide current if the memory cell is on and all other current mirror pixel drive elements may enabled subject to external control signals and the memory cell data state. The W/L ratio of each reference current FET is equal to the W/L ratio of all other reference current FETs. The W/L ratio of the current source FETs in each of the current mirror pixel drive elements is equal to the others. The present invention allows adjustment of the current density within the current source FET as well as the sensitivity of the current source FET to threshold voltage variation.