Display drive circuits

Details Display drive circuits Display drive circuits

G - Physics

06

F

375/48

G06F 3/14 (2006.01) G09F 9/00 (2006.01) G09G 3/30 (2006.01)

Patent

CA 1070873

ABSTRACT Drive circuits for a flat panel display using a matrix of DC re- sponsive phosphor dots are disclosed. Enabled row conductors receive a pulse of DC potential equal to +HV, whereas disabled row conductors receive +HV/2. Enabled column conductors receive zero potential, whereas disabled column conductors receive + HV/2. HV is in the range 90 to 140V. This allows semiconductor integrated circuit display drivers to be used in con- junction with the column conductors. Discrete transistor complementary- pair drivers are used for the row conductors. Scanning and character gener- ation functions are achieved by the use of semiconductor integrated circuits. A pulse-width brightness control operates by selection of one of several logical combinations of the outputs of a counter. Two or four column driver circuits are provided to simplify high density connection problems and a divider circuit causes the column driver circuits to be addressed in se- quence. Physical connection to the column drivers is made alternately from the top and bottom of the matrix.

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