Touch Display Panel Time-Sharing Contact Pad Multiplexing
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Solution Overview
Problem
The increasing number of signal lines in high-resolution touch display devices leads to a higher number of contact pads, which complicates the bonding process and reduces pad pitches, making it difficult to implement effectively, especially in current IC packaging processes.
Innovation Solution
A touch display panel design that includes first selection switches connected to both data lines and touch-control lines, allowing them to share the same contact pad during different time periods, reducing the number of contact pads and increasing pad pitches by enabling time-sharing multiplexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of signal lines is increased to achieve high-resolution display, then the display resolution is improved, but the number of contact pads increases which complicates the bonding process and reduces pad pitches
Solution Approach 1:
The patent combines data lines and touch-control lines to share common contact pads through selection switches. Specifically, first data lines and first touch-control lines share first contact pads, while second data lines and second touch-control lines share second contact pads. This merging reduces the total number of contact pads required while maintaining high-resolution display capabilities.
Solution Approach 2:
The contact pads are designed to serve multiple functions by being shared between data transmission and touch control operations. The selection switches enable each contact pad to be dynamically assigned to different signal lines based on operational mode, making the contact pads universal rather than dedicated to single functions.
2Adaptability or versatility
If the number of contact pads is increased to support more signal lines, then the signal transmission capability is improved, but the pad pitch decreases making bonding difficult
Solution Approach 1:
Multiple signal lines (data lines and touch-control lines) are merged to share common contact pads through selection switches. This reduces the total contact pad count while preserving full signal transmission capability, thereby increasing pad pitch and facilitating the bonding process.
Solution Approach 2:
The system employs dynamic switching through selection switches that can connect contact pads to different signal lines based on operational requirements. This dynamic allocation allows fewer contact pads to handle more signal lines, improving manufacturability without sacrificing adaptability.
3Ease of operation
If dedicated contact pads are assigned to each signal line to simplify connections, then the connection simplicity is improved, but the number of contact pads increases reducing pad pitches
Solution Approach 1:
The patent merges the function of multiple dedicated contact pads into fewer shared contact pads by introducing selection switches. While this increases switching logic, it significantly reduces the physical number of contact pads required, thereby increasing pad pitch and simplifying the overall structure.
Solution Approach 2:
Selection switches act as intermediary components between contact pads and signal lines. These switches enable a small number of contact pads to interface with a larger number of signal lines, reducing the direct one-to-one mapping requirement and decreasing the total contact pad count.
4Adaptability or versatility
If more contact pads are used to support increased signal lines, then the signal line capacity is improved, but the bonding process becomes more complex and yield decreases
Solution Approach 1:
The patent combines multiple signal line connections through shared contact pads using selection switches. This reduces the total number of bonding points required while maintaining full signal line capacity, thereby simplifying the bonding process and improving manufacturing yield.
Solution Approach 2:
Selection switches serve as intermediary devices that enable multiple signal lines to be connected through fewer contact pads. This reduces the complexity of the bonding process by decreasing the number of bonding points while preserving the system's signal line capacity.
Data Source
AI summary
A touch display panel, and a touch display device are provided. The touch display panel includes: a plurality of first data lines; a plurality of touch-control lines; a plurality of first contact pads; a plurality of first selection switches connected to the plurality of first contact pads in an one-to-one correspondence manner; each first selection switch is electrically connected to one first contact pad, one first data line and one touch-control line, and is configured to receive a first control signal and, according to the first control signal, electrically connect a first contact pad and a first data line during a first time period and electrically connect the first contact pad and a touch-control line during a second time period, and the first time period and the second time period do not overlap.