Patent ID: 8044898

Claim:
An LED display apparatus, comprising: a power circuit having a constant current power source; a display matrix circuit connected to said power circuit, said display matrix circuit including multiple LED circuits parallel-connected to each other, each of said parallel-connected LED circuits including: multiple LEDs connected in series, a single first switching element serially-connected to the multiple LEDs connected in series, and multiple second switching elements connected in series to each other, each second switching element connected in parallel to a corresponding one of the multiple LEDs connected in series so as to form rows of multiple second switching elements extending across said display matrix circuit, each row including one second switching element of each of said multiple LED circuits connected in parallel; and a control circuit including a column control circuit connected to each of said parallel-connected LED circuits and configured to turn on the first switching element of each of said parallel-connected LED circuits for a given time period in a predetermined sequence, and a row control circuit connected to each of said rows and configured to turn on/off one or more of the rows in correspondence with the column control circuit turning on the first switching element of each of said parallel-connected LED circuits.