| 摘要 |
<p>PURPOSE:To obtain the picture element constitution of the liquid crystal display device which enables the remedy of a display defect so that even if a thin film transistor (TFT) element becomes defective, a display similar to that of other normal picture elements can be obtained. CONSTITUTION:This liquid crystal display device consists of a substrate 1 where a picture element part 6 is arranged, an opposite electrode 2, a liquid crystal layer sandwiched between the substrate 1 and opposite electrode 2, a scanning-side driving circuit 3, a signal-side driving circuit 4, and an external control circuit 5. A TFT 9 and a TFT 9a which is made redundant are provided at the intersection of a scanning line 7 and a signal line 8. Further, a holding capacitance 11 and a redundant holding capacitance 11a which are connected to the scanning line 7a and picture element electrode 10 in the precedent stage are provided. If there is the defective TFT, on the other hand, the drain electrode of the TFT is disconnected from the signal line 8 and while the source electrode also disconnect the defective TFT from a picture element electrode 10, the holding capacitance 11a which is made redundant is disconnected from the picture element electrode. Consequently, the balance of W/L and the holding capacitances can be kept and the display similar to that of other picture elements including no defective TFT is obtained.</p> |
