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
OG exemplary drawing
 
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.