In-cell Touch Display Switching Part for Signal Routing
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Solution Overview
Problem
In-cell type touch display devices face limitations in efficiently integrating touch sensing and display driving methods, particularly in managing common voltage and touch scan signals across electrodes, which affects the accuracy and efficiency of touch input detection.
Innovation Solution
The solution involves dividing electrodes into groups and using a switching part to apply common voltage or touch scan signals based on the driving mode, with a display driver IC generating common voltage and touch IC generating touch scan signals, allowing sequential application of signals to electrode groups during touch driving modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a switching part is introduced to manage common voltage and touch scan signals, then touch input detection accuracy is improved, but device complexity increases
Solution Approach 1:
The switching part is designed to perform multiple functions: it manages both common voltage application and touch scan signal routing, and can operate in different modes (display driving mode and touch driving mode) depending on the operational requirements. This multi-functionality allows a single component to handle diverse signal types without requiring separate dedicated circuits for each function, thereby improving detection accuracy while limiting the increase in overall device complexity.
2Productivity
If electrodes are divided into groups for sequential signal application, then touch sensing efficiency is improved, but control complexity increases
Solution Approach 1:
The electrode structure is segmented into multiple groups, allowing sequential application of touch scan signals to different electrode groups. This segmentation enables more efficient touch sensing by reducing signal interference and allowing systematic scanning across the display. The switching part controls which electrode group receives signals at any given time, managing the complexity through structured signal routing rather than requiring complex control logic for each individual electrode.
Solution Approach 2:
The switching part operates in periodic cycles, alternating between display driving mode and touch driving mode, and sequentially applying signals to different electrode groups in a systematic pattern. This periodic operation simplifies control complexity by using regular, predictable timing sequences rather than requiring complex adaptive control for each signal transition, while still achieving improved touch sensing efficiency through the sequential scanning approach.
Data Source
AI summary
An in-cell type touch display device includes a panel including a plurality of electrodes, a display driver integrated circuit (IC) and a switching part, the plurality of electrodes being divided into a plurality of groups; and a touch IC generating a touch scan signal and applying the touch scan signal into the switching part, wherein the display driver IC generates a common voltage and applies the common voltage into the switching part, and wherein the switching part applies the common voltage into the plurality of electrodes or sequentially applies the touch scan signal into the electrodes in the plurality of groups according to a driving mode of the panel.