LIQUID CRYSTAL DISPLAY DEVICE AND ITS DRIVING METHOD

摘要

PURPOSE:To reduce variance in the plane of the best common potential by setting the peripheral edge length mum of the capacity part of each complete holding capacity element to less than a specific multiple of the value obtained by dividing the area mum<2> of the capacity part by the diagonal length inches of an area where the picture elements of a thin film transistor drive type liquid crystal display device are arranged. CONSTITUTION:The line width of the common electrode signal line 303 of an intersection part 523 is set normally less than the line width at the capacity part 310. At the intersection part 523, for example, an amorphous Si layer 311 for short probability reduction is arranged between the common electrode signal line 303 and a video signal line 302. Further, a transfer electrode 323 is provided in order to connect transparent picture element electrodes 309 above and below an intersection step so that the breaking of the transparent picture element electrodes 30 due to the step formed at an end part of the common electrode signal line 303 is evaded. The relation between the area 5, peripheral edge length L of the complete holding capacity element 310 and the diagonal length D of the area satisfy an inequality I. Consequently, variance in capacity value due to element size variance is a little and such a defect as an afterimage and deterioration of liquid crystal is not caused.