Tape Carrier Package Center Align Mark for LCD Panel Alignment
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Solution Overview
Problem
Liquid crystal display devices face frequent misalignment issues between tape carrier packages and panels due to the smaller width of output pads at the central part, which are not adequately aligned with the pads on the liquid crystal display panel, despite correct edge alignment.
Innovation Solution
Incorporating a first center align mark on the tape carrier package, preferably between adjacent output pads or lines, and using distinct colors for the align mark and output patterns to facilitate accurate alignment, along with additional align marks on the edges, to ensure proper alignment between the tape carrier package and the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If align marks are formed only on the edges of the data tape carrier package, then the edge alignment with the liquid crystal display panel is correct, but the output pads in the central part with smaller widths cannot be aligned with the pads on the panel
Solution Approach 1:
The alignment mark configuration is segmented into multiple types: edge align marks for overall positioning and center align marks for fine-tuning the central output pad alignment. This segmentation allows different regions of the tape carrier package to have specialized alignment features addressing their specific alignment needs.
Solution Approach 2:
Center align marks are introduced as intermediary alignment features between the edge align marks and the central output pads. These intermediary marks provide an additional reference point that facilitates precise alignment of the narrow central pads without requiring changes to the edge alignment system.
2Reliability
If output pads in the central part are made with smaller widths to reduce resistance deviation, then resistance uniformity is improved, but misalignment with the panel pads becomes more frequent
Solution Approach 1:
Different alignment mark characteristics are applied to different locations: edge align marks with standard visibility are used at the edges, while center align marks with enhanced visibility (distinct color, larger size) are placed at the central location where the narrow output pads require more precise alignment. This local differentiation addresses the specific alignment difficulty at the central region.
3Manufacturing precision
If multiple align marks are added to improve central pad alignment, then alignment accuracy is improved, but the device structure becomes more complex
Solution Approach 1:
The center align marks are implemented with a distinct color different from the output patterns and other align marks. This color differentiation provides an immediate visual cue for operators to identify and use the correct alignment marks, simplifying the alignment process despite the presence of multiple alignment features.
Data Source
AI summary
A liquid crystal display device is disclosed, by which misalignment between a tape carrier package and a panel can be prevented in a manner of forming an align mark between output pads provided to a central part of the tape carrier package. The present invention includes a panel having a display unit configured to display an image and a non-display unit configured to enclose the display unit, at least one drive integrated circuit generating various kinds of signals required for displaying the image on the display unit of the panel, a tape carrier package having the drive integrated circuit loaded thereon, the tape carrier package having a plurality of input patterns for connecting input pins of the drive integrated circuit to an external circuit and a plurality of output patterns for connecting output pins of the drive integrated circuit to the panel, and at least one first center align mark provided to the tape carrier package to be located between the input patterns adjacent to each other or between the output patterns adjacent to each other, the at least one first center align mark used to align the panel and the tape carrier package with each other.