Scan lines driver and organic light emmiting display device using the same

摘要

In a scan lines driver that is used for driving scan lines of an organic light emitting diodes (OLED) display, a large voltage drop can develop between the gate or source of one of its transistors and the corresponding drain during a scan signal outputting period. This large voltage drop can excessively stress the one transistor. However, in accordance with the present disclosure, a voltage drop dissipating, second transistor is provided in series with the first transistor for absorbing part of the large voltage drop and thus reducing the stress that is applied to the first transistor.

主权项

1. A scan lines driver comprising a plurality of successive scan driving blocks, each including a respective first input terminal to which one of a frame start signal or an output signal from a previous scan driving block of the succession of scan driving blocks is input by way of a corresponding first control connection, respective second and third input terminals to which first and second clock signals are applied by way of corresponding second and third control connections, and a respective output terminal from which a corresponding scan signal is output,
wherein each of the plurality of scan driving blocks respectively comprises: a first transistor interposed between the respective first input terminal of its respective scan driving block and a first node of its respective scan driving block and configured so as to selectively transmit there through or block the corresponding frame start signal or the output signal of the previous scan driving block in accordance with the clock signal delivered to the second input terminal of its respective scan driving block; a second transistor coupled to the respective third input terminal and output terminal of its respective scan driving block and configured so as to selectively coupled the third input terminal with the output terminal in accordance with a voltage level present on the first node of its respective scan driving block; and a third transistor interposed between the respective first input terminal of its respective scan driving block and the first node so as to be in series with the first transistor and to thereby dissipate a portion of a voltage developed between the first node and the first input terminal of its respective scan driving block.