TFT Array Via-Hole Layout for Higher OLED Pixel Aperture
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Solution Overview
Problem
The design of high-resolution organic light-emitting display devices is limited by the space constraints of via holes, which affect the lifespan and aperture ratio of pixels.
Innovation Solution
A thin film transistor array substrate with a pixel arrangement structure that includes via holes of different sub-pixels positioned at varying locations, allowing for increased sizes of pixel electrodes and improved aperture ratios while maintaining the required intervals between sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If via holes are positioned in a regular grid pattern, then manufacturing is simpler, but aperture ratio and pixel lifespan are reduced due to space constraints
Solution Approach 1:
The patent applies asymmetry by positioning via holes in different columns at different horizontal positions rather than using a regular grid pattern. Specifically, via holes in even-numbered columns are positioned at a first horizontal position while via holes in odd-numbered columns are positioned at a second horizontal position, creating an asymmetric staggered arrangement that increases aperture ratio while maintaining manufacturing feasibility
Solution Approach 2:
The patent transitions from a two-dimensional regular grid arrangement to a staggered arrangement that effectively utilizes space in another dimension. By offsetting via holes in alternating columns, the design creates a more efficient spatial distribution that increases the aperture ratio without complicating the manufacturing process
2Productivity
If via holes are positioned closer together, then pixel density increases, but manufacturing precision requirements increase due to fine metal mask constraints
Solution Approach 1:
The patent segments the via hole positioning into two distinct groups based on column parity. Via holes in even-numbered columns are positioned at one location while via holes in odd-numbered columns are positioned at another location. This segmentation allows each group to be manufactured with standard precision while achieving higher overall pixel density through the staggered arrangement
3Area of stationary object
If pixel electrode size is increased, then aperture ratio improves, but via hole space becomes more constrained
Solution Approach 1:
The asymmetric staggered positioning of via holes in alternating columns creates additional space around pixel electrodes, allowing for larger pixel electrode areas and higher aperture ratios. The irregular pattern prevents via holes from directly competing for space with enlarged pixel electrodes
Data Source
AI summary
A thin film transistor array substrate having a pixel arrangement structure includes a first sub-pixel for displaying a first color and a second sub-pixel for displaying a second color alternately located in a first column, and a third sub-pixel for displaying a third color in a second column adjacent to the first column, and via holes of the first through third sub-pixels in a same row are at different positions.