Patent ID: 9286847
Filing Date: 2016-03-15
CPC Classification: G02F,G09G

Claim Text:
1. A repairable gate on array (GOA) circuit for flat panel display, comprising multiple GOA units cascaded with each other, charging an n-th level horizontal scanning line in the display region according to the n-th level GOA unit, both ends of the n-th level horizontal scanning line being connected with one said n-th level GOA unit, the n-th level GOA unit comprising a pull-up circuit, a pull-down circuit, a pull-down holding circuit, a pull-up control circuit, a boost strap capacitor, and a first thin film transistor; the pull-up circuit, the pull-down circuit, the pull-down holding circuit, and a boost strap capacitor being respectively connected with a gate signal point and the n-th level horizontal scanning line, the pull-up control circuit being connected with the gate signal point; the gate of the first thin film transistor inputting a level clock signal, the drain and the source thereof being respectively connected with the gate signal point and the n-th level horizontal scanning line; wherein, when the n-th level GOA unit is working normally, at least one of the drain and the source of the first thin film transistor keeps disconnected with the n-th level GOA unit, when the pull-down holding circuit is abnormal, isolate the pull-down holding circuit from the n-th level GOA unit, and completely connect the first thin film transistor to the n-th level GOA unit to finish repair, wherein the pull-up control circuit comprises: a second thin film transistor, the gate thereof being connected with the (n−2)-th level horizontal scanning line, the drain and the source thereof being respectively connected with the (n−2)-th level horizontal scanning line and the gate signal point; and a third thin film transistor, the gate thereof being connected with the (n−1)-th level horizontal scanning line, the drain and the source thereof being respectively connected with the (n−1)-th level horizontal scanning line and the gate signal point.