Thin-film transistor liquid crystal display devices that generate gray level voltages having reduced offset margins

Patent 6331847 Issued on December 18, 2001. Estimated Expiration Date:

April 12, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Data driver circuit of liquid crystal display for achieving digital gray-scale
Patent #: 5196738
Issued on: 03/23/1993
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Inventor: Moon

Thin-film transistor liquid crystal display devices having cross-coupled storage capacitors
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Issued on: 09/15/1998
Inventor: Bae

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Inventor: Jung

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Patent #: 6014122
Issued on: 01/11/2000
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Issued on: 12/05/2000
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Inventors

Assignee

Samsung Electronics Co., Ltd.

Application

No. 290375 filed on 04/12/1999

US Classes:

345/100, Particular row or column control (e.g., shift register)345/89, Gray scale capability (e.g., halftone)345/98, Specific display element control means (e.g., latches, memories, logic)345/99Particular timing circuit

Examiners

Primary: Nguyen, Chau
Assistant: Alphonse, Fritz

Attorney, Agent or Firm

Myers Bigel Sibley & Sajovec

Foreign Patent References

5289053 JP. 11/18/1993
8122733 JP. 05/18/1996

International Class

G09G 003/36

Foreign Application Priority Data

1998-04-13 KR

Abstract

TFT-LCD devices having improved data line driver circuits therein comprise an follower amplifier which drives a data line of a panel "hard" during a first portion of a selection time interval (when a strong pull-up or pull-down is required) and a transmission gate which performs a "soft" pull-up or pull-down of the data line to a desired gray level voltage during a second portion of the selection time interval. The "soft" pull-up or pull-down can be utilized to reduce the offset margins of gray level voltages to within &#b1;5 mV.