Touch Display Panel Driving with Segmented TDDI ICs
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Solution Overview
Problem
Existing touch display panels require multiple integrated-circuit chips to drive and sense touch events, leading to complex information processing and erroneous sensing at edge regions between touch areas.
Innovation Solution
A system comprising multiple devices with display and touch sensing channels, coupled with a touch controller that receives and processes touch information from separate integrated-circuit chips to accurately determine touch events across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple TDDI ICs are used to drive medium/large touch display panels, then the display and touch sensing functions can be achieved, but the touch information processing becomes complex due to different edge conditions in different touch areas
Solution Approach 1:
The touch display panel is divided into multiple touch areas, with each TDDI IC responsible for driving a specific touch area. This segmentation allows parallel processing of touch information from different areas, reducing the overall processing complexity while maintaining the ability to handle large panel areas.
Solution Approach 2:
Each TDDI IC is configured with area-specific parameters and program codes tailored to the edge conditions of its corresponding touch area. This local optimization enables each IC to handle its specific region efficiently without requiring complex global processing for all areas.
2Ease of operation
If each TDDI IC senses only its corresponding touch area, then the sensing function is simplified, but erroneous touch events may occur at edge regions between different touch areas
Solution Approach 1:
The touch controller merges touch information from multiple TDDI ICs and performs centralized touch event determination. This combination approach allows the system to distinguish between genuine touch events and false signals at edge regions by analyzing data from multiple sources collectively.
Solution Approach 2:
The touch controller acts as an intermediary that receives touch information from multiple TDDI ICs, processes the data to resolve edge region ambiguities, and determines accurate touch events. This mediator role eliminates erroneous sensing while maintaining the simplicity of individual IC sensing operations.
3Productivity
If touch information from multiple touch areas is processed separately by individual TDDI ICs, then each IC operates independently, but the system cannot correctly determine touch events at edge regions
Solution Approach 1:
The system segments touch information processing into two stages: (1) parallel collection of touch data from multiple areas by individual TDDI ICs, and (2) centralized analysis by the touch controller. This segmentation maintains processing efficiency while enabling accurate edge region event determination through coordinated analysis.
Solution Approach 2:
The touch controller receives feedback from multiple TDDI ICs and performs comprehensive touch event determination by analyzing the combined information. This feedback mechanism ensures that touch events at edge regions are accurately identified by considering data from all relevant touch areas.
Data Source
AI summary
An apparatus for driving a touch display panel is provided. The touch display panel has a plurality of data lines and a plurality of sensing lines. The apparatus includes a first device, a second device and a touch controller. The first device includes a plurality of touch sensing channels configured to sense the first portion of the sensing lines. The second device includes a plurality of touch sensing channels configured to sense the second portion of the sensing lines. The touch controller receives respective touch information from the first device and the second device. The respective touch information includes a first touch information corresponding to the first portion of the sensing lines and a second touch information corresponding to the second portion of the sensing lines. The touch controller determines a touch event of the touch display panel according to the first touch information and the second touch information.