Testing method for array substrate
View Patent ↗A testing method for an array substrate is disclosed which includes a first measuring step of operating a line electrode driver circuit 15 and a row electrode driver circuit 16 like in a normal display mode while implementing writing in/reading out of a test video signal to and from supplemental capacitors 13 , and a second measuring step of implementing writing in/reading out of the test video signals to and from a video bus 163 while rendering TFTs 11 of a pixel section 18 and analog switches 162 of the row electrode driver circuit 16 to be held turned off. Obtaining a difference between a measured result of the first measuring step and a measured result of the second measuring step allows only a pixel component and a row electrode component with no driver component to be derived, whereupon discrimination is implemented for the presence of or the absence of electric defects in the pixel section.
1. A testing method for an array substrate including a pixel section having pluralities of mutually intersecting row electrodes and line electrodes, a plurality of pixel electrodes arranged at intersections of the row and line electrodes, each pixel electrode electrically connected to a supplemental capacitor and respective one of the row electrodes via a switching element, and first pads connected with the row electrodes and second pads connected with the line electrodes, the testing method comprising:
a first measuring step of controlling the pixel switching element into a conductive state, applying a test video signal supplied to at least one of the first pads for supplying the test video signal to the supplemental capacitor via the pixel switching element, and subsequently reading out the test video signal from the same circuit line;
a second measuring step of controlling the pixel switching element into a non-conductive state, applying the test video signal to the first pad for supplying the test video signal to the row electrode, and subsequently reading out the test video signal from the row electrode; and
wherein an electric defect of the pixel section is detected from a differential component between the signal read out in the first measuring step and the signal read out in the second measuring step.
2. The testing method for an array substrate according to claim 1 , wherein after applying the test video signal in the first measuring step, the test video signal is read out from the same circuit line after an elapse of one frame period.
3. The testing method for an array substrate according to claim 2 , wherein after applying the test video signal in the second measuring step, the test video signal is read out from a video bus after the elapse of one frame period.