Two pixel electrodes interposing the signal line extending into without extending beyond the recess on the protection film caused by the contact hole
View Patent ↗In an electrode substrate used in a liquid crystal display device, a contact hole for connecting a signal line to a drain electrode of a pixel thin film transistor is provided in a position overlapping a pixel electrode in order to improve yields by reducing a short circuit between adjacent pixel electrodes. With this configuration, the contact hole does not exist at a boundary between the two adjacent pixel electrodes. Accordingly, the pixel electrodes do not suffer an influence of an electrode material remaining at a recess of the contact hole, and a short circuit between the adjacent pixel electrodes can be thereby prevented.
1. An electrode substrate for a display device comprising:
a plurality of scan lines and a plurality of signal lines which are disposed so as to intersect one another;
a plurality of pixel electrodes disposed at respective intersections;
switching elements provided at the respective intersections, each of the switching elements being configured to allow conduction between the signal line and the pixel electrode by an instruction of a gate signal to be supplied to the scan line and thereby to write a video signal supplied to the signal line into the pixel electrode;
a protection film formed between the signal line and the pixel electrode; and
contact holes configured to connect the signal line and one electrode of the switching element,
wherein each of the signal lines is formed so as to cover a gap between two pixel electrodes being adjacent in a direction of the scan line, the contact holes cause recesses on the protection film, an end of only one of the two pixel electrodes which are adjacent to each other while interposing the signal line is provided in a position extending into without extending beyond the recess on the protection film caused by the contact hole, and an end of the other one of the two pixel electrodes is distant from an aperture edge of the contact hole by a longer dimension than a horizontal dimension of a tapered portion of the contact hole.