LCD Positional Marks for Drive IC Bonding Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge in liquid crystal displays (LCDs) is the risk of bonding deviation between metal bumps on drive ICs and circuit pads, leading to potential short circuits and impaired electrical performance, which requires precise positioning and costly manufacturing processes.
Innovation Solution
Incorporating horizontal and vertical positional marks on the wires of the liquid crystal panel, aligned with the sidelines of the drive ICs, to ensure accurate alignment and bonding of metal bumps with circuit pads, reducing the risk of deviation and allowing for mass production without expensive precision apparatuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If precision apparatuses and accurate operation are used to bond drive ICs, then bonding precision is improved, but manufacturing cost increases
Solution Approach 1:
Positional marks are formed on the liquid crystal panel during the wire formation process before the bonding process. These marks serve as reference points that enable accurate positioning of drive ICs during subsequent bonding operations, eliminating the need for expensive precision positioning apparatuses while maintaining high bonding accuracy
Solution Approach 2:
Positional marks act as an intermediary reference system between the liquid crystal panel and drive ICs. By providing visible alignment references, these marks enable operators to achieve precise bonding without requiring complex automated positioning equipment, thus reducing manufacturing costs while maintaining precision
2Productivity
If pitch between adjacent wires is reduced, then wire density is improved, but bonding deviation risk increases
Solution Approach 1:
Positional marks are pre-formed on the liquid crystal panel to establish reference points before bonding. These marks remain visible even when wire pitch is reduced, providing stable alignment references that prevent bonding deviation and maintain reliability despite increased wire density
Solution Approach 2:
Positional marks are strategically placed at specific locations (such as at the ends of wires or in bonding regions) rather than uniformly across the entire panel. This localized approach provides necessary alignment references without interfering with the reduced pitch wiring layout, maintaining both high wire density and bonding accuracy
Data Source
AI summary
An exemplary liquid crystal display (2) includes a liquid crystal panel (20) and a drive integrated circuit (IC) (21). The liquid crystal panel includes a plurality of circuit pads (202), a first positional mark (2031), and a second positional mark (2032). The drive IC includes a plurality of metal bumps (210) respectively electrically connected to the circuit pads of the liquid crystal panel, a first sideline (2131), and a second sideline (2132) oriented at an angle relative to the first sideline. A distance from the first positional mark to a nearest one of the circuit pads is equal to a distance from the first sideline to a nearest one of the metal bumps. A distance from the second positional mark to a nearest one of the circuit pads is equal to a distance from the second sideline to a nearest one of the metal bumps.