Patent ID: 7733306
Filing Date: 2010-06-08
Classification: G09G,G11C,H01L

Abstract:
1. A static RAM (SRAM) core cell for a light-emitting display including a plurality of thin film transistors each having a gate, a source and a drain as a data memory for a data driver of the light-emitting display, the SRAM core cell comprising: a switching transistor coupled to a bit line and a word line to select writing or reading of data; and a first data memory transistor and a second data memory transistor coupled to a power voltage Vdd, a third data memory transistor and a fourth data memory transistor coupled to a ground voltage Vss, to enable writing or reading of data, wherein the bit line and the word line are in first and second directions, respectively, wherein channels of the switching transistor and the data memory transistors are in an oblique direction with respect to the first and second directions, respectively, wherein the channels of the first data memory transistor and the third data memory transistor are on one side of the word line and the channels of the second data memory transistor and the fourth data memory transistor are on another side of the word line, with respect to the first direction, wherein the first data memory transistor and the second data memory transistor include polysilicon layers deposited in an oblique direction with respect to the first and second directions and the switching transistor includes a polysilicon layer deposited in a same direction with respect to the first direction, and wherein the word line is in an approximately bent shape when crossing the bit line to provide a space for a contact on the bit line from a source/drain of the switching transistor to the bit line, wherein the word line is in an approximately second bent shape when crossing a second bit line adjacent to the bit line to provide a space for a second contact on the second bit line, and wherein the approximately bent shape and the approximately second bent shape are configured in a substantially mirror image with respect to the word line.