Asymmetric Source Fan-Out for LCD Panel PCB Size Reduction
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Solution Overview
Problem
The challenge is to reduce manufacturing costs and size of liquid crystal display (LCD) apparatuses while minimizing the size of printed circuit boards (PCBs) in LCD devices.
Innovation Solution
The solution involves a display panel design with asymmetric source fan-out portions and equivalent resistance structures to connect pixels of different colors to source lines, allowing for a perpendicular arrangement of pixels and concentrating source tape carrier packages (TCPs) towards the central portion of the panel, thereby reducing the size of the PCB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gate TCPs are used to electrically connect the LCD panel with the PCB, then reliability of electrical connection is improved, but device size and manufacturing cost increase
Solution Approach 1:
The invention extracts and eliminates the gate TCP component from the system by implementing a gate IC-less structure, where the gate driving circuit is directly integrated on the LCD panel substrate, thereby reducing device size while maintaining electrical connection functionality
Solution Approach 2:
The gate driving circuit is merged with the LCD panel substrate through direct mounting, eliminating the need for separate gate TCP components and reducing overall device volume while preserving electrical connection reliability
2Volume of moving object
If asymmetric source fan-out portion is used to connect pixels of different colors to source lines, then PCB size is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The source fan-out portion is designed with asymmetric structure where output lines extending to pixels of different colors have different lengths, allowing concentration of source TCPs towards the central portion of the panel and reduction of PCB size
Solution Approach 2:
The invention applies different line width specifications to different output lines based on their specific routing requirements, with wider lines for longer paths and narrower lines for shorter paths, thereby maintaining uniform resistance characteristics across all output lines despite their different lengths
Data Source
AI summary
A display panel includes a source-pad portion, a first source fan-out portion and source lines. The source-pad portion has a group of pads to which a driving signal is applied from an external source. The source fan-out portion has output lines that are extended from the group of pads and are formed to have an asymmetric structure. The source lines are extended from the output lines, and pixels of different colors are connected to each of the source lines. Accordingly, a unit pixel portion is formed to be perpendicular to each other and a fan-out portion is formed to have the asymmetric structure, so that a size of a printed circuit board is remarkably decreased. Thus, costs for manufacturing a display apparatus may be decreased.