Touch Display Screen Single PCB Integration
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Solution Overview
Problem
Conventional touch display devices require two printed circuit boards, increasing complexity and cost due to the need for separate connections for thin film transistors and touch electrodes.
Innovation Solution
A touch display screen design where the thin film transistor is electrically connected to a driving circuit, which is connected to a single flexible printed circuit board, with touch electrodes connected through leads that span across the board, eliminating the need for two separate printed circuit boards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two separate printed circuit boards are used to connect thin film transistors and touch electrodes, then electrical connection reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges two separate printed circuit boards into a single integrated printed circuit board that provides both the driving circuit connections for thin film transistors and the touch electrode connections. This integration maintains electrical connection reliability while reducing device complexity and manufacturing cost by eliminating the need for two separate PCBs and their associated connection interfaces.
Solution Approach 2:
The single printed circuit board is designed to perform multiple functions: it serves as the driving circuit board connecting to thin film transistors and simultaneously serves as the touch signal processing board connecting to touch electrodes. This multi-functional design eliminates the need for separate specialized boards while maintaining all required electrical connections.
2Reliability
If two separate printed circuit boards are used, then electrical connection reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines two separate printed circuit boards into one integrated board, reducing manufacturing cost by eliminating duplicate manufacturing processes, reducing material usage, and simplifying assembly operations. The single board design maintains all necessary electrical connections while reducing overall manufacturing complexity and cost.
Solution Approach 2:
The patent discards the redundant second printed circuit board that would otherwise be needed for touch electrode connections. By integrating touch signal processing into the driving circuit board, the design eliminates unnecessary components and reduces manufacturing cost without compromising electrical connection reliability.
3Reliability
If two separate printed circuit boards are used, then electrical connection reliability is improved, but the manufacturing process becomes more complicated
Solution Approach 1:
The patent merges the manufacturing processes for two separate printed circuit boards into a single integrated board manufacturing process. This reduces process complexity by eliminating the need for separate PCB fabrication, testing, and assembly steps, while maintaining all required electrical connections through the integrated design.
Solution Approach 2:
The integrated printed circuit board is designed with pre-configured connection areas for both thin film transistors and touch electrodes, allowing for simplified manufacturing where all connections are established during a single board fabrication process rather than requiring subsequent assembly steps to connect separate boards.
Data Source
AI summary
An embodiment of the present disclosure discloses a touch display screen including: a display unit including: an upper substrate; a lower substrate located below the upper substrate and opposed to the upper substrate, the lower substrate is arranged with a plurality of thin film transistors, a driving circuit and a printed circuit board, a plurality of the thin film transistors is electrically connected to the driving circuit, the driving circuit is electrically connected to the printed circuit board; a touch unit including: a first touch electrode is electrically connected to the printed circuit board through a first lead; a second touch electrode electrically insulated from the first touch electrode, the second touch electrode is electrically connected to the printed circuit board through a second lead. The present disclosure has the advantage of reducing the cost.