Touch Frequency Synchronization in Display Panels to Prevent Line Defects
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The unsynchronized frequency between panel driving signals and touch driving signals in flat panel displays leads to horizontal line defects and stain defects due to varying coupling voltages, affecting display quality.
Innovation Solution
Synchronizing the driving frequency of the display panel with the frequency of the touch driving signal, ensuring the touch driving signal is a multiple of the display panel frequency, typically using a periodic function like a sinewave, to maintain consistent voltage coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch driving signal frequency is independent of the panel driving signal frequency, then the touch panel can operate independently, but horizontal line defects and stain defects occur due to varying coupling voltages
Solution Approach 1:
The patent applies parameter changes by synchronizing the frequency of the touch driving signal with the driving frequency of the display panel. Specifically, the touch driving signal frequency is set to be N times the panel driving frequency (where N is a positive integer), ensuring that voltage coupling remains consistent and preventing horizontal line defects and stain defects while maintaining touch functionality.
2Reliability
If the touch driving signal frequency is synchronized with the panel driving frequency, then display quality improves by reducing defects, but the touch panel loses independent operation flexibility
Solution Approach 1:
The patent implements dynamics by allowing the touch driving signal frequency to be dynamically adjusted based on the panel driving frequency. The frequency relationship is defined as f_touch = N × f_panel, where N can be configured according to different operating conditions, enabling both synchronization for quality and flexible adaptation for different touch panel configurations.
3Device complexity
If unsynchronized frequencies are used, then device complexity is reduced, but coupling voltage varies causing display defects
Solution Approach 1:
The patent applies periodic action by establishing a periodic relationship between the touch driving signal frequency and the panel driving frequency. The touch driving signal operates at N times the panel frequency, creating a harmonious periodic pattern that ensures consistent voltage coupling at regular intervals, thereby preventing display defects while maintaining manageable system complexity.
Data Source
AI summary
A display apparatus includes a display panel, a panel driver, a touch driving output layer of a touch panel and touch driver. The display driver outputs a panel driving signal to the display panel. The touch driver outputs a touch driving signal to the touch driving signal output layer. The display apparatus determines a driving frequency of the display panel according to the panel driving signal and synchronizes a frequency of the touch driving signal with the driving frequency.