Touch IC Frequency Hopping to Prevent Display Panel Harmonic Noise
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Touch panels in display apparatuses experience noise in electrical signals due to user touches, which is a challenge in reducing power consumption.
Innovation Solution
A display apparatus with a touch panel and display panel that adjusts the touch panel's driving frequency to a different frequency when it matches the display panel's frequency to avoid harmonic noise, using a touch IC to monitor and change the frequency to a hopping or dithered frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the touch panel and display panel operate at the same driving frequency to simplify system design, then device complexity is reduced, but harmonic noise occurs in electrical signals during user touches
Solution Approach 1:
The touch panel driving frequency is made dynamic rather than fixed. The touch IC continuously monitors the display panel's driving frequency and adjusts the touch panel's frequency in real-time to maintain a difference, preventing harmonic noise while allowing flexible operation across different display modes
Solution Approach 2:
The driving frequency parameter of the touch panel is changed based on the display panel's operating conditions. When the display panel operates at a certain frequency, the touch panel frequency is adjusted to a different value to avoid matching frequencies that cause harmonic noise
2Object-generated harmful factors
If the touch panel driving frequency is continuously adjusted to avoid noise, then noise in electrical signals is reduced, but device complexity increases due to frequency monitoring and adjustment mechanisms
Solution Approach 1:
The frequency monitoring and adjustment functions are merged into the existing touch IC. The touch IC utilizes its existing frequency generation capabilities to both generate the touch panel driving frequency and adjust it based on display panel conditions, eliminating the need for separate frequency control hardware
Solution Approach 2:
The touch IC autonomously monitors the display panel's driving frequency and self-adjusts the touch panel's driving frequency without requiring external intervention. The system uses its own resources to detect and resolve frequency conflicts, reducing overall system complexity
Data Source
AI summary
A display apparatus is disclosed that includes a touch panel, a display panel, and a touch integrated circuit (IC) configured to determine whether a first frequency, which is a driving frequency of the display panel, matches a second frequency, which is a driving frequency of the touch panel, and change the second frequency to a third frequency that is different from the first frequency when the first frequency matches the second frequency.