Touch Sensing System Bridge Circuit for High-Speed Data Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As display apparatuses increase in size, the number of sensing electrodes on touch panels also increases, leading to longer sensing times and difficulties in effective touch sensing.
Innovation Solution
A touch sensing system comprising a touch panel with driving and sensing electrodes, multiple touch integrated circuits that sequentially drive the electrodes to sense information, a bridge to align and transmit sensing data, and a controller to detect touch coordinates based on the transmitted data, enabling efficient touch sensing even with a larger number of electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of sensing electrodes is increased to cover a larger touch panel area, then the coverage area is improved, but the sensing time increases and touch sensing effectiveness deteriorates
Solution Approach 1:
The touch panel is divided into multiple sensor regions, each handled by a separate touch IC. This segmentation allows parallel processing of sensing data from different regions, reducing the total sensing time while maintaining full panel coverage.
Solution Approach 2:
The patent introduces a time dimension by implementing sequential driving of driving electrodes across different sensor regions at different time slots. Multiple touch ICs operate simultaneously but process different spatial regions, transforming a spatial problem into a spatio-temporal solution.
2Area of stationary object
If the number of sensing electrodes is increased to cover a larger touch panel area, then the coverage area is improved, but the complexity of data processing increases
Solution Approach 1:
Data processing complexity is reduced by segmenting the touch panel into multiple independent sensor regions, each processed by a dedicated touch IC. This distributes the computational burden across multiple independent processing units rather than overwhelming a single processor.
Solution Approach 2:
A bridge circuit is introduced as an intermediary component that collects sensing data from multiple touch ICs, performs initial processing and coordination, and manages data flow to the controller. This intermediary layer simplifies the overall system architecture by handling complex data routing and synchronization.
3Speed
If multiple touch integrated circuits are used to process sensor regions, then the sensing speed is improved, but the risk of memory I/O collisions increases
Solution Approach 1:
The bridge serves as an intermediary buffer between multiple touch ICs and the controller, managing memory access and data transmission. It coordinates I/O operations to prevent collisions while maintaining high sensing speed through efficient data routing and timing control.
Solution Approach 2:
The system implements periodic action through sequential driving of driving electrodes in different time slots for different sensor regions. This time-division multiplexing approach allows multiple touch ICs to operate simultaneously without conflicting memory access, as each IC accesses memory during its designated time period.
Data Source
Figure 1
Figure 2(A)~2(B)
Figure 3
AI summary
The present disclosure is related to a touch sensing system (100) and a display apparatus decreasing a sensing time and enabling an effective touch sensing, although a number of sensing electrodes (Rx1 to RxM) increases according to an increase of an area of a touch panel (110).