Simplified Touch Driver Circuit for Narrow Border Displays
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Solution Overview
Problem
The existing touch driver circuits for hybrid in-cell embedded touch display panels occupy too much space due to a large number of elements and signals, making them unsuitable for narrow border designs.
Innovation Solution
A simplified touch driver circuit structure that reduces the number of elements and signals by using a select signal to control the operation of transport gates, eliminating the need for multiple control signals and simplifying the circuit layout, thereby reducing the border width of the touch display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional touch driver circuit with multiple control signals and elements is used, then the circuit can achieve complete functional control, but the layout space occupied is too large for narrow border designs
Solution Approach 1:
The patent extracts and removes redundant control signals (TXSW and HRSW) and circuit elements from the conventional driver circuit structure. By eliminating these unnecessary components while retaining the core cascading functionality through the simplified select signal control mechanism, the layout space is reduced without sacrificing essential functional control capability.
Solution Approach 2:
The select signal is designed to serve multiple functions simultaneously: it controls the output unit's signal selection, manages the cascading unit's signal transmission, and coordinates the operation of transport gates. This multi-functional design replaces multiple dedicated control signals, reducing the overall circuit complexity and layout space while maintaining complete operational control.
2Area of stationary object
If the number of control signals and circuit elements is reduced, then the layout space is reduced for narrow border design, but the circuit control complexity increases
Solution Approach 1:
The patent merges the functions of multiple control signals (TXSW, HRSW, and other control lines) into a single select signal. This consolidation reduces the number of control lines and circuit elements, thereby reducing layout space. The merged select signal maintains comprehensive control capability through its coordinated interaction with the cascading unit and transport gates, preventing an increase in overall control complexity.
3Manufacturing precision
If multiple control signals are used to manage transport gates and cascading units, then precise control is achieved, but the circuit occupies more space
Solution Approach 1:
The patent extracts unnecessary control signals from the conventional circuit design. By removing redundant control lines while retaining the essential select signal that coordinates the transport gates and cascading units, the circuit achieves precise control with fewer elements, thereby reducing layout space without sacrificing control precision.
Data Source
AI summary
The invention provides a touch driver circuit, by only using a select signal (Select) to control the operation of transport gates (TG1, TG2) to realize output of a valid pulse touch driver signal (TXH) and a constant low voltage signal (TXL). The circuit structure is simplified, and removes a plurality of elements and two control signals so as to reduce the layout space occupied by the touch driver circuit as well as reduced the border width of the touch display to realize narrow border design for touch display panel.