Driving method and driving device of goa circuit

Abstract

The invention provides a driving method and device of a GOA circuit. According to the driving method, level shifting chips are connected into a high voltage source, a low voltage source and a transition voltage source which is smaller than the high voltage source and larger than the low voltage source, and a time sequence controller provides pulse width control signals so that the high level of target clock signals obtained through the conversion of the level shifting chips can be equal to the high voltage source, the low level can be equal to the low voltage source, and when the target clock signals are switched from the high level to the low level or are switched from the low level to the high level, the target clock signals are switched to the transition voltage source first, remain for a first duration at the transition voltage source, and then are switched from the transition voltage source to the low voltage source or the high voltage source; meanwhile, the pulse width control signals are used for controlling the length of the first duration, accordingly the power consumption and the feed-through effect of the GOA circuit can be lowered, and the driving device of the GOA circuit is not limited by the duty ratio of clock signals.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a driving method and a driving device for a GOA circuit. Background technique [0002] Active Matrix Liquid Crystal Display (AMLCD) is currently the most commonly used display device, the active matrix liquid crystal display includes a plurality of pixels, each pixel has a thin film transistor (Thin Film Transistor, TFT), the The gate of the TFT is connected to the scanning line extending in the horizontal direction, the source of the TFT is connected to the data line extending in the vertical direction, and the drain of the TFT is connected to the corresponding pixel electrode. If enough positive voltage is applied to a scanning line in the horizontal direction, all TFTs connected to the scanning line will be turned on, and the data signal voltage loaded on the data line will be written into the pixel electrode, thereby displaying the picture . [0003] One type of active mat...

AI Technical Summary

Problems solved by technology

[0005] like figure 2 As shown, the clock signal CKV' converted by the traditional level shift chip 200 only has two states of high level (33V) and low level (-10V), and as the size of the liquid crystal display panel becomes larger and larger , the resolution is getting higher and higher, and the corresponding GOA series is also increasing. At this time, continuing to use the clock signal CKV' with only two states of high level and low level will cause the power consumption of the GOA circuit to be very large, and the feedthrough (feedthrough) effect is also very obvious

like image 3 As shown, in order to reduce the power consumption of the GOA circuit, the prior art proposes a charge sharing (Charge sharing) technology, which combines a clock signal CKV1' at a high level with another clock signal at a low level CKV7' is short-circuited, so that the clock signals CKV1' and CKV7' both increase a transition level state. When the clock signal switches between high level and low level, it will first switch to the transition level and then switch to high level. Level or low level, but this method must meet the conditions that the rising edge of CKV1' and the falling edge of CKV7' are generated at the same time, and the falling edge of CKV1' and the rising edge of CKV7' are also generated at the same time, that is, this method can only be used For clock signals with a duty cycle of 50%, it is not applicable to clock signals with a duty cycle not equal to 50%, with obvious limitations

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