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US 7,733,306 B2Granted
SRAM core cell for light-emitting display
AssigneeSamsung Mobile Display Co., Ltd.
InventorHan-Hee Yoon
Life of this patent
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Abstract
A SRAM core cell for a light-emitting display applicable to a data driver of an organic electro-luminescence light-emitting display device includes thin film transistors as a data memory for a data driver of the light-emitting display. The SRAM core cell also includes switching transistors and data memory transistors. The switching transistors are coupled to a bit line and a word line to select data writing or reading. The data memory transistors are coupled to a power voltage or a ground voltage to enable data writing and reading. The bit line and the word line are formed in first and second directions. The channels of the switching transistors and the data memory transistors are formed in an oblique direction with respect to the first and second directions.
Claims12
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.
6 more elements
A static RAM (SRAM) core cell comprising:
- a first thin film switching transistor having a gate coupled to a word line, and a source/drain coupled to a first bit line, to select an input to the first bit line according to an input signal to the word line;
- a second thin film switching transistor having a gate coupled to the word line, and a source/drain coupled to a second bit line, to select an input to the second bit line according to an input signal to the word line;
- and
- four thin film data memory transistors coupled to a power voltage or a ground voltage, to enable writing or reading of data under the control of the first and second switching transistors, wherein the bit lines and the word line being formed in first and second directions, respectively,
- wherein channels of the first and second switching transistors and the four data memory transistors are in an oblique direction with respect to the first and second directions, respectively,
- wherein the channels of first two of the four data memory transistors are on one side of the word line and the channels of second two of the four data memory transistors are on another side of the word line, with respect to the first direction,
- wherein some of the four data memory transistors include polysilicon layers deposited in an oblique direction with respect to the first and second directions and at least one of the switching transistor includes a polysilicon layer deposited in a same direction with respect to the first direction,
- wherein the word line is in an approximately first bent shape when crossing the first bit line to provide a space for a first contact on the first bit line from the source/drain of the first switching transistor to the first bit line,
- wherein the word line is in an approximately second bent shape when crossing the second bit line to provide a space for a second contact on the second bit line from the source/drain of the second switching transistor to the second bit line, and
- wherein the approximately first bent shape and the approximately second bent shape are configured in a substantially mirror image with respect to the word line.
7 more elements
A semiconductor device comprising:
- a substrate;
- and
- a plurality of transistors each having a gate and a source/drain formed on an active region deposited on the substrate,
- wherein channels of the transistors formed on the active region being formed in an oblique direction with respect to a layout width or length direction on a layout space of a predetermined area,
- wherein the channel of one or two transistors is formed on a word line, the channels of a first half of the remaining transistors are on one side of the word line and the channels of a second half of the remaining transistors are on another side of the word line,
- wherein at least one of the transistors includes a polysilicon layers deposited in an oblique direction with respect to the layout width direction and least one of the transistors includes a polysilicon layer deposited in a same direction with respect to the layout width direction,
- wherein the word line is in an approximately bent shape when crossing a bit line to accommodate a contact on the bit line from a source/drain of the one of the transistors 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.
5 more elements
Dependencies are inferred from the claim text.