Liquid Crystal Display Contact Hole Layout for Unevenness Suppression
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Solution Overview
Problem
Existing display devices experience display unevenness due to the orientation film around contact holes, which is not adequately addressed by current techniques.
Innovation Solution
A display device design that includes an array substrate with specific arrangements of signal and scanning lines, organic insulating films, and contact conductive layers, where contact holes are positioned to deviate from each other in a certain direction, and are partially covered by an organic insulating film to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact holes are formed in the organic insulating film to establish electrical connections, then electrical connectivity is achieved, but display unevenness occurs due to orientation film disturbance around the contact holes
Solution Approach 1:
A light-shielding film is introduced as an intermediary layer between the contact holes and the liquid crystal layer. This light-shielding film compensates for the light leakage caused by orientation film disturbance around the contact holes, thereby eliminating display unevenness while maintaining the necessary electrical connectivity through the contact holes.
Solution Approach 2:
The light-shielding film utilizes optical property changes (light absorption/blocking) to counteract the harmful light leakage effect. By positioning the light-shielding film to overlap with the contact holes, it absorbs or blocks the leaked light, transforming the optical characteristics in the problematic regions and achieving uniform display quality.
2Object-affected harmful factors
If the light-shielding film overlaps with the contact holes to suppress display unevenness, then display quality is improved, but parasitic capacitance increases between the light-shielding film and underlying conductive layers
Solution Approach 1:
The light-shielding film is not uniformly applied across the entire substrate but is selectively positioned only in regions where contact holes are present and where display unevenness occurs. This localized application approach minimizes the total area of the light-shielding film, thereby reducing the overall parasitic capacitance while still effectively suppressing display unevenness at the critical contact hole regions.
3Object-affected harmful factors
If multiple insulating films and conductive layers are added to suppress display unevenness, then display quality is improved, but device complexity increases
Solution Approach 1:
The light-shielding film serves multiple functions simultaneously: it acts as a light-shielding layer to suppress display unevenness, provides an insulating barrier to manage parasitic capacitance, and can serve as a structural support layer. By combining multiple functions into a single layer, the patent avoids adding excessive separate components, thereby limiting the increase in device complexity while achieving effective suppression of display unevenness.
Data Source
AI summary
A display device comprising: an array substrate; a counter substrate provided with color filters; and a liquid crystal layer between the array substrate and the counter substrate; wherein one surface of the array substrate includes a plurality of signal lines arranged side by side in a first direction with a gap interposed therebetween, a plurality of scanning lines arranged side by side in a second direction with a gap interposed therebetween, a first organic insulating film provided on the signal lines, and a second organic insulating film provided on the first organic insulating film; and each region surrounded by the corresponding scanning line and the corresponding signal line includes a semiconductor layer, a first contact conductive layer, a second contact conductive layer, and a first electrode.