US 6,982,687 B2 | ||
Data drive circuit for current writing type AMOEL display panel | ||
Hak Soo Kim, Seoul (Korea, Republic of); Young Sun Na, Kyonggi-do (Korea, Republic of); and Oh Kyoung Kwan, Kyongsangbuk-do (Korea, Republic of) | ||
Assigned to LG Electronics Inc., Seoul (Korea, Republic of) | ||
Filed on Jan. 06, 2003, as Appl. No. 10/336,743. | ||
Claims priority of application No. P 2002-1175 (KR), filed on Jan. 09, 2002. | ||
Prior Publication US 2003/0128202 A1, Jul. 10, 2003 | ||
Int. Cl. G09G 3/30 (2006.01) |
U.S. Cl. 345—76 | 6 Claims |
1. A data drive circuit for a current writing type AMOEL display panel comprising:
a plurality of current output channels; and
a plurality of channel current generating circuits on respective current output channels for minimizing a difference of current
levels occurred between the current output channels, each including;
one pair of PMOS transistors having the same widths and lengths and a common gate terminal,
a first bias circuit connected to the common gate terminal of the pair of PMOS transistors for prevention of floating of the
common gate terminal,
a first NMOS transistor for receiving an output current from the pair of PMOS transistors,
n (n+1, 2, 3, - - - ) second NMOS transistors connected to a gate terminal of the first NMOS transistor, each for forming
a current mirror with the first NMOS transistor for mirroring the output current from the pair of the PMOS transistors, and
n PMOS transistors respectively connected to the n second NMOS transistors in series, wherein outputs of the n PMOS transistors
are connected in parallel.
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