Shift register, liquid crystal display device having the shift register and method of driving scan lines using the same

Abstract

In a bi-directional shift register and a liquid crystal display device having the bi-directional shift register, the shift register further includes a dummy stage for resetting a last stage. The dummy stage is reset by a control signal of the last stage or by the output signal of the dummy stage. Therefore, power consumption and layout area may be reduced. The shift register includes a plurality of stages and two dummy stages, and two selection signals for selecting shift direction is applied to each of the stages.

Description

technical field [0001] The present invention relates to a shift register, a liquid crystal display (LCD) device having the same, and a method of driving a scanning line using the same. Background technique [0002] LCD devices have several advantages over other display devices such as CRT type display devices. In detail, an LCD device can be manufactured with a thinner and lighter structure with lower power consumption and requires a lower driving voltage than other display devices, and it can provide a performance similar to that of a CRT type display device. Image display quality. LCD devices are widely used in various electronic devices. [0003] When a voltage is applied to the liquid crystal molecules, the alignment angle of the liquid crystal molecules is changed, and the light transmittance of the liquid crystal molecules is adjusted, thereby displaying an image. [0004] LCD devices are classified into twisted nematic (TN, twisted nematic) type LCD devices and sup...

AI Technical Summary

Problems solved by technology

[0015] However, in the shift register of the conventional amorphous silicon TFT LCD device, the shift direction is fixed, and the conventional amorphous silicon TFT LCD device does not provide a bidirectional shift register in which forward shift or backward shift occurs

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