Sense Driving Unit Integration in Display Device Touch Sensing
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Solution Overview
Problem
Existing capacitive-type sensing units in display devices have complex wiring arrangements at the outer periphery of the active region, which can complicate the design and increase the area required for sensing units, making them less efficient and more prone to noise, especially in multi-touch scenarios.
Innovation Solution
The capacitive-type sensing unit is designed with a simplified wiring arrangement at the outer periphery by separating the sense driving unit from the touch IC, allowing for independent control of driving signals to the driving electrodes, thereby reducing the need for external signal reception pads and connections, and using a shared clock signal generation circuit for both gate and sense stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensing unit uses a traditional capacitive method with driving electrodes and sensing electrodes connected to external pads, then the touch detection function is achieved, but the wiring arrangement at the outer periphery becomes complex and the area required increases
Solution Approach 1:
The sensing unit extracts the sense driving unit from the external touch IC and integrates it into the circuit layer of the display panel. This separation allows the sense driving unit to be independently controlled and positioned, simplifying the external wiring arrangement while maintaining touch detection functionality. The sense driving unit receives driving control signals directly from the circuit layer rather than requiring external pad connections.
Solution Approach 2:
The sensing unit merges the sense driving unit with the circuit layer structure, placing it within the same layer as the gate driving unit. This integration consolidates the wiring arrangements within the display panel itself, reducing the need for complex external wiring and pad connections at the outer periphery while maintaining all necessary touch sensing functions.
2Area of stationary object
If the sensing unit integrates more functions within the circuit layer, then the outer periphery area is reduced and wiring is simplified, but the design complexity of the circuit layer increases
Solution Approach 1:
The circuit layer is segmented into distinct functional units: the gate driving unit with multiple gate stages and the sensing unit with multiple sense stages. Each stage is independently designed and controlled, allowing for modular integration within the circuit layer. This segmentation manages design complexity by creating repeatable, standardized stage structures that can be systematically arranged.
Solution Approach 2:
The circuit layer is designed with universal stage structures that can serve multiple functions. The gate stages and sense stages use similar circuit configurations and can share common control signals (first clock signal, second clock signal), allowing the circuit layer to handle both display scanning and touch sensing operations with a unified design approach.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design simplifies the wiring layout, reduces the outer periphery area, and improves the margin for wiring arrangement design, enhancing the sensitivity and accuracy of touch detection while minimizing noise, especially in multi-touch scenarios.
Implementation Method 1
a mutual capacitance is formed between the driving electrodes and the sensing electrodes. When a touch is externally applied, a touch IC may recognize an input of the touch by sensing a change amount of the mutual capacitance through the sensing electrodes
Data Source
AI summary
A display device includes a display panel including a base film and a circuit layer disposed on the base film, the circuit layer including a plurality of gate lines, a plurality of data lines, and a gate driving unit configured to receive gate control signals and provide a gate signal to the plurality of gate lines, and a sensing unit including a plurality of driving electrodes, a plurality of sensing electrodes, a sense driving unit configured to receive driving control signals and provide a sense driving signal to the plurality of driving electrodes, and sensing pads configured to transfer, to the outside, an electric signal received from each of the plurality of sensing electrodes, wherein the sense driving unit is included in the circuit layer.