Display Panel MIPI Lane Phasing for Touch Noise Reduction
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Solution Overview
Problem
Display apparatuses experience noise in the touch screen layer due to signal interference, leading to errors in touch detection.
Innovation Solution
Implementing a display apparatus with MIPI data lanes having different phases for first and second access lines during low power state signals, and incorporating touch signal lines on a separate layer intersecting the MIPI data lanes to reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIPI data lanes are used to transmit signals between processor and driving driver, then data transmission efficiency is improved, but noise is generated in the touch screen layer leading to errors
Solution Approach 1:
The patent separates touch signal lines and MIPI data lanes into different physical layers. Touch signal lines are routed on layers above or below the MIPI data lane layers, creating spatial separation that prevents electromagnetic interference while maintaining efficient data transmission through the MIPI interface.
Solution Approach 2:
The patent extracts the touch signal transmission path from the same physical layer as the MIPI data lanes. By routing touch signal lines on separate layers and using crossing points without electrical connection, the touch detection signals are isolated from the noisy MIPI data transmission environment.
2Device complexity
If touch signal lines and MIPI data lanes are routed on the same layer, then device complexity is reduced, but signal interference occurs causing errors in touch screen layer
Solution Approach 1:
The patent utilizes the third dimension (vertical layering) to resolve the conflict between routing simplicity and signal interference. Touch signal lines and MIPI data lanes are placed on different z-layers of the flexible printed circuit board, allowing both to coexist without interference while maintaining relatively simple routing paths.
Solution Approach 2:
The patent introduces crossing points as intermediary structures where touch signal lines intersect MIPI data lanes without electrical connection. These crossing points act as mediators that allow signals to pass through different layers without direct contact, preventing interference while maintaining routing efficiency.
Data Source
AI summary
A display apparatus includes: a display panel including a display layer and a touch screen layer; a flexible printed circuit board electrically connected to one side of the display panel; a driving driver on the display panel; a processor on the flexible printed circuit board; and mobile industry processor interface (MIPI) data lanes on the flexible printed circuit board and electrically connecting the processor and the driving driver to each other, wherein each of the MIPI data lanes includes a first access line and a second access line, and in at least one of the MIPI data lanes, a phase of a signal at the first access line and a phase of a signal at the second access line are configured to be different from each other, based on transmission of a low power state (LPS) signal.