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:
Apr. 21, 2009
Filed:
Jan. 24, 2008
Cheng-lung Chiang, Tainan County, TW;
Ming-cheng Chiu, Tainan County, TW;
Ting-jung Ku, Tainan County, TW;
Cheng-Lung Chiang, Tainan County, TW;
Ming-Cheng Chiu, Tainan County, TW;
Ting-Jung Ku, Tainan County, TW;
Himax Technologies Limited, Sinshih Township, Tainan County, TW;
Abstract
For reducing device areas required by digital-to-analog converters used in source driving circuits of a liquid crystal display device, a compound circuit structure based on a pre-decoder, a binary decoder, and ROM decoders is set forth to meet the demand for cutting down the device areas. The pre-decoder is configured to decode a first sub-signal of a digital data signal for generating a plurality of control signals. Each of the ROM decoders is configured to select a gamma reference voltage out of one corresponding set of gamma reference voltages based on the control signals and a second sub-signal of the digital data signal. The binary decoder is configured to select one of the gamma reference voltages selected by the ROM decoders based on a third sub-signal of the digital data signal for outputting an output voltage. The number of transistors used by the compound circuit structure is then reduced significantly.