LCD Data Pad Segmentation for Fine Pitch Bonding
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Solution Overview
Problem
Current LCD devices face challenges in reducing the size of data TCPs and data pads while maintaining alignment during bonding, leading to increased manufacturing costs and potential misalignment issues.
Innovation Solution
The implementation of data pads with alternating large and small sized parts, arranged at fixed intervals on the data TCP, to facilitate efficient bonding and prevent misalignment, allowing for a finer pitch design and reduced size of data pads and TCPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If data pads are reduced in size to decrease TCP size, then manufacturing cost decreases, but alignment precision during bonding deteriorates
Solution Approach 1:
The data pad is divided into multiple bonding areas (first bonding area and second bonding area) with different sizes. This segmentation allows the pad to maintain overall reduced size while having specific regions that provide sufficient bonding area for precise alignment during TCP bonding operations.
Solution Approach 2:
Different regions of the data pad are designed with different bonding area characteristics. The first bonding area has a specific size configuration optimized for alignment, while the second bonding area provides additional bonding capability. This local differentiation resolves the contradiction between small overall size and sufficient bonding/alignment area.
2Device complexity
If data pads are arranged at fixed intervals to enable fine pitch design, then TCP size decreases, but bonding reliability worsens due to potential misalignment
Solution Approach 1:
The data pad structure is segmented into multiple bonding areas that can independently provide alignment references. This segmentation enables fine pitch arrangement while maintaining multiple bonding points that enhance bonding reliability even when pads are closely spaced.
Solution Approach 2:
The data pad is pre-designed with multiple bonding areas of different sizes positioned at specific locations. This preliminary configuration ensures that during bonding operations, even with fixed interval arrangement, the pads will have adequate alignment references and bonding areas to prevent misalignment and ensure reliable bonding.
Data Source
AI summary
An LCD device is disclosed, which is suitable for designing a pad for a fine pitch to decrease a pad and a data TCP of a data driver in size, the LCD device including: an LCD panel that includes upper and lower substrates and a liquid crystal layer; a gate driving unit that includes a plurality of gate drivers formed corresponding to an edge area of the lower substrate; a data driving unit that includes a plurality of data drivers connected with a source PCB and the lower substrate by respective data TCPs; and a plurality of data pads that are arranged at fixed intervals on the data TCP so as to transmit a data signal of the data driving unit to a data line of the LCD panel, wherein each of the data pads includes first and second parts having different bonding areas.