Bi-directional Scalable Intra-Panel Interface for Touch Displays
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Solution Overview
Problem
Conventional timing controller-source driver interfaces are not optimized to handle multi-function pixel display panels effectively, particularly in capturing and processing data from touch-sensitive surfaces, leading to inefficiencies in data transmission and processing.
Innovation Solution
A bi-directional scalable intra-panel interface (SIPI) is introduced, enabling efficient bi-directional communication between a timing controller and source drivers, incorporating a forward link for data transmission from the timing controller to source drivers and a backward link for touch sensor data from source drivers to the timing controller, along with an auxiliary status channel and power management bus, facilitating seamless data exchange and power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional timing controller-source driver interface is used, then the interface structure is simple, but it cannot effectively handle multi-function pixel display panels and touch sensor data
Solution Approach 1:
The SIPI interface is designed as a universal bi-directional communication interface that can handle multiple functions including display data transmission, touch sensor data transmission, and control signaling through a single integrated protocol, eliminating the need for separate dedicated channels for each function
Solution Approach 2:
The interface employs dynamic packet-based communication where data packets can be flexibly configured to carry different types of information (display data, touch data, control commands) based on real-time requirements, allowing the interface to adapt its functionality dynamically rather than being fixed for single-purpose use
2Reliability
If separate control channels are used for touch data transmission, then data transmission reliability is improved, but device complexity and disturbance increase
Solution Approach 1:
Multiple communication functions (display data control, touch data transmission, auxiliary status) are merged into a single bi-directional SIPI interface using packet-based communication, reducing the number of separate channels while maintaining reliability through protocol-level error handling and acknowledgment mechanisms
Solution Approach 2:
A packet-based communication protocol acts as an intermediary layer that organizes and manages different types of data (display, touch, control) within standardized packet structures, enabling reliable transmission through the single SIPI interface without requiring separate dedicated channels for each data type
Data Source
AI summary
A touch panel display subsystem for bi-directional intra-panel communication includes a forward link and a backward link between a timing controller and one or more source drivers. The forward link includes a timing controller transmitter in the timing controller to receive video signal, video control signal and touch control signal, and to transmit over the forward link in the format of frame based packet, and a source driver receiver in the source driver to receive video signal, video control signal and touch control signal over the forward link. The backward link includes a source driver transmitter in the source driver to receive the touch sensor data and transmit the touch sensor data over the backward link when the backward link is enabled, and a timing controller receiver in the timing controller to receive the touch sensor data over the backward link when the backward link is enabled.