Panel scanning drive circuit and method thereof

Abstract

The invention provides panel scanning drive circuit and method thereof, which can switch the electrical connection among an upward pulling control unit, a downward pulling control unit and a field effect transistor in a scanning drive circuit by using a multiplexer so that grids of the field effect transistor can alternately operate in different voltage levels. By the invention, the critical voltage level deviation can be reduced after the field effect transistor is used for a long time.

Description

technical field [0001] The present invention relates to a driving circuit for a display panel and a method thereof, in particular to a scanning driving circuit for a display panel and a method thereof. Background technique [0002] In order to effectively reduce and simplify the design of the scan drive unit of the display, and at the same time maintain its high-efficiency control capability, a circuit design in which the scan drive circuit is directly arranged on a glass substrate has appeared in the current technology, such as: the known thin film In the scanning driving circuit of transistor liquid crystal display, please refer to Figure 1a As shown, it is a schematic block diagram of a voltage control circuit in a scanning drive circuit of a known liquid crystal screen, including a pull up (pull up) control circuit 10, a pull up circuit 11, a pull down (pull down) control circuit 12, a Pull circuit 13. Its purpose is to output the scanning signal to the subsequent elec...

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Problems solved by technology

However, although this method can reduce the burden of the field effect transistors 17 and 19 by half, however, because in one frame time, the time for a scan line to output VGL is much longer than the time for VGH, that is, the time for the pull-down circuit to be turned on will be much longer than that of VGH. Therefore, the gate of the field effect transistor 15 electrically connected to the pull-up control circuit 10 is still at a low voltage level most of the time, while the gates of the field effect transistors 17 and 19 electrically connected to the pull-down control circuit 12 Most of the time is still at a high voltage level, so for field effect transistors 15, 17, 19, after a long period of use, they still have to face the problem of critical voltage shift

[0004] In view of this, the present invention aims at the above-mentioned problems, and proposes a panel scan driving circuit and its method, which uses a switching unit to select field effect transistors in an interactive selection manner, so that different field effect transistors can be switched under different timings. Connected to the pull-up control unit and the pull-down control unit to improve the known problem of voltage level drift over time

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