Touch Control Driving Unit With Segmented Shift Register And Strobe Circuit
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Solution Overview
Problem
Existing touch control driving circuits have complex structures, large areas, unstable outputs, and high noise, making them unsuitable for narrow-frame designs and efficient touch control operations.
Innovation Solution
A touch control driving unit comprising a shift register circuit, strobe circuit, and output circuit with amplifying and logic gate configurations that generate and control touch control signals, providing a stable output and reducing noise, while allowing for cascaded operation with fewer control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing touch control driving circuits are used, then touch control function is achieved, but the circuit structure becomes complex and area increases
Solution Approach 1:
The driving circuit is divided into multiple independent driving units, each responsible for driving one scanning electrode. Each unit contains a shift register circuit, strobe circuit, and output circuit with amplifying element. This segmentation allows independent operation and simplifies the overall system design while maintaining full touch control functionality.
Solution Approach 2:
The patent combines the shift register, strobe circuit, and output amplifying element into an integrated driving unit structure. The control signal lines are merged and shared across multiple driving units, reducing the total number of control lines needed. The cascaded connection of shift register circuits merges the triggering signal path efficiently.
2Reliability
If existing touch control driving circuits are used, then touch control operation is achieved, but noise increases and output stability decreases
Solution Approach 1:
Each driving unit incorporates a dedicated amplifying element (first amplifying element) that provides localized signal amplification right at the output stage. This local amplification ensures strong drive capability for each scanning electrode while maintaining signal integrity and reducing noise propagation to other parts of the system.
Solution Approach 2:
The strobe circuit acts as an intermediary between the shift register and the output amplifying element. It receives the triggering signal and generates a strobe signal that controls the output circuit, providing buffered signal transmission and isolation that reduces noise while maintaining output stability.
3Manufacturing precision
If more control signals are used, then driving precision is improved, but device complexity and area increase
Solution Approach 1:
The control signal lines are designed to serve multiple driving units simultaneously. The first control signal line and second control signal line are shared across all driving units in the cascade, providing universal control functionality. Each driving unit responds to the same control signals but operates at different time stages due to the cascaded shift register structure.
Solution Approach 2:
The circuit uses periodic clock signals (first clock signal and second clock signal) to control the shift register circuits in a time-sequential manner. This periodic control allows precise timing and sequencing of multiple driving units using the same control lines, achieving driving precision without requiring dedicated control lines for each unit.
4Adaptability or versatility
If circuit area is reduced for narrow-frame design, then adaptability is improved, but output stability and noise performance worsen
Solution Approach 1:
By segmenting the driving circuit into compact, modular driving units, each unit can be efficiently laid out to minimize area while maintaining internal signal integrity. The modular structure allows optimized placement and routing within the narrow frame constraints without compromising output stability.
Solution Approach 2:
Each driving unit is self-contained with its own amplifying element and strobe circuit, providing self-service signal amplification and control. This eliminates the need for long interconnect lines that would be problematic in narrow-frame designs, as each unit handles its own signal conditioning locally, maintaining stability despite compact dimensions.
Data Source
AI summary
A touch control driving unit includes a shift register circuit, a strobe circuit and an output circuit, wherein the shift register circuit includes a first control port, an input port and a triggering signal output port, is connected to the strobe circuit, and is configured to generate a triggering signal; the strobe circuit includes a second control port and a strobe signal port, is connected to the shift register circuit, and is configured to control the output circuit; and the output circuit includes an output port, a stable level port and a touch control signal port, and is configured to output a stable level or a touch control signal under control of the strobe circuit.