Matrix Sensing Apparatus Reducing Sensing Lines
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing matrix sensing apparatus for LCD touch panels requires a large number of sensing lines, leading to high circuit complexity and making it difficult to achieve low-cost and high-resolution displays.
Innovation Solution
The matrix sensing apparatus is designed with each sensing line coupled to two adjacent columns of sensing areas, reducing the quantity of required sensing lines, and employs a coordinate mapping unit to locate touch positions by mapping sensing signals to corresponding coordinates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If each sensing line is coupled to only one column of sensing units, then the sensing signal output is straightforward, but the quantity of sensing lines required is tremendous, leading to high circuit layout complexity
Solution Approach 1:
The patent merges multiple columns of sensing units to share common sensing lines. Specifically, two adjacent columns (even columns and odd columns) are coupled to the same sensing lines through different transistor configurations, reducing the total number of sensing lines required while maintaining the ability to read out all sensing signals
Solution Approach 2:
The patent segments the sensing readout process into multiple phases using different transistor switching states. During different time periods, different columns are activated to share the same sensing lines, allowing temporal separation of signal acquisition that reduces spatial requirements for sensing lines
2Ease of manufacture
If the quantity of sensing lines is reduced, then the circuit layout complexity is reduced and cost is lowered, but the ability to accurately locate touch positions must be maintained
Solution Approach 1:
The patent introduces a coordinate mapping unit that acts as an intermediary to map the reduced set of sensing line signals back to the original matrix coordinates. This mapping process reconstructs the full touch position information from the fewer number of sensing lines, maintaining measurement precision while reducing hardware complexity
Solution Approach 2:
The patent adds a temporal dimension to the sensing process by using time-multiplexed readout. Different columns are read out at different time periods through transistor switching, effectively transforming a spatial problem (number of sensing lines) into a temporal problem (sequential readout), thereby reducing the number of physical sensing lines needed
Data Source
AI summary
A matrix sensing apparatus with architecture having reduced quantity of required sensing lines is disclosed. The matrix sensing apparatus includes a plurality of driving lines, a plurality of sensing lines and a matrix sensing region. The matrix sensing region includes a plurality of sensing areas. Each sensing area includes a first transistor, a second transistor, and a sensing unit for generating a sensing signal. The first transistor is coupled to the sensing unit and a corresponding sensing line. The second transistor is coupled to the first transistor, a first corresponding driving line and a second corresponding driving line. The first transistor together with the second transistor functions to control the signal connection between the sensing unit and the corresponding sensing line based on the driving signals of the first and second corresponding driving lines.