Display Substrate Layout for Transmittance and Short-Circuit Control
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Solution Overview
Problem
The transmittance of liquid crystal display devices is a key factor in determining display quality, and the overlapping area between common and pixel electrodes, particularly near the slits of pixel electrodes, affects the tilts of the display medium, leading to potential short circuits and reduced transmittance.
Innovation Solution
A semiconductor substrate design with specific configurations of conductive lines and electrodes, including non-overlapping and angled edges, to enhance transmittance while preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the overlapping area between common electrodes and pixel electrodes is increased, then the control of display medium tilts is improved, but the transmittance of the display device is reduced
Solution Approach 1:
The patent applies local quality by making the conductive line width variable along its length. Specifically, the first conductive line has a first width in the region overlapping the semiconductor layer and a second width in the region not overlapping, where the first width is greater than the second width. This localized variation optimizes the electric field distribution precisely where needed (overlapping region) while minimizing impact on transmittance in non-overlapping regions.
2Reliability
If the conductive line width is increased to improve electrode connection, then the electrical connectivity is enhanced, but the overlapping area with semiconductor layer increases causing reduced transmittance
Solution Approach 1:
The conductive line is designed with different widths in different regions: a first width (greater) in the overlapping region with the semiconductor layer to ensure good electrical connectivity and field control, and a second width (smaller) in the non-overlapping region to minimize transmittance loss. This localized differentiation resolves the contradiction between connectivity and transmittance.
Solution Approach 2:
The conductive line is effectively segmented into two functional zones: a wider first part for electrical connection and field control over the semiconductor layer, and a narrower second part for minimal optical interference. This segmentation allows each portion to be optimized for its specific function.
Data Source
AI summary
A semiconductor substrate includes: a substrate; a first conductive line extending along a first direction; a semiconductor layer, wherein the first conductive line includes a first part overlapping with the semiconductor layer and a second part not overlapping with the semiconductor layer, the first part of the first conductive line has a first width along a second direction different from the first direction, the second part of conductive line has a second width along the second direction, and the first width is greater than the second width; and an electrode disposed on the semiconductor layer and including an arc edge outside the first conductive line, wherein the semiconductor layer includes a first part extending along the second direction and overlapping with the arc edge and a second part connecting the first part and overlapping with a side of the first part of the first conductive line.