Touch Display Device with Frequency-Differentiated Driving Circuit
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Solution Overview
Problem
Touch display devices face challenges in maintaining high signal-to-noise ratios and touch sensitivity due to noise interference from display driving, especially in self-luminous and large-area panels, which reduces their effectiveness in touch sensing.
Innovation Solution
A touch display device and touch driving circuit design that employs separate touch electrode lines driven with distinct frequencies different from display driving frequencies, utilizing a filter to isolate touch signals and reduce noise interference, thereby enhancing signal quality and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If display driving is performed to display images on the touch display device, then the display function is achieved, but noise is generated that reduces the signal-to-noise ratio and touch sensitivity
Solution Approach 1:
The touch display device divides the display area into multiple zones (first display area and second display area) with different display driving frequencies. This segmentation allows different regions to operate at different frequencies, reducing overall noise interference while maintaining display functionality across the entire panel.
Solution Approach 2:
The patent changes the display driving frequency parameter across different spatial zones of the display panel. By varying the frequency parameter from one region to another, the system reduces noise accumulation and improves signal-to-noise ratio for touch sensing without compromising display performance.
2Area of stationary object
If the touch sensor is built into the display panel or the display panel has a large area, then the integration and coverage are improved, but noise interference increases and touch sensitivity deteriorates
Solution Approach 1:
The large-area touch sensor is segmented into multiple regions corresponding to different display areas, each driven at different frequencies. This spatial segmentation prevents noise from propagating across the entire panel and allows each segment to maintain optimal signal-to-noise ratio despite the overall large area.
3Adaptability or versatility
If display driving affects touch sensing, then both functions are integrated in one device, but noise is generated that reduces touch sensitivity
Solution Approach 1:
The integrated display and touch sensor are segmented into multiple operational zones with different driving frequencies. This allows both functions to coexist in the same device while reducing the noise impact from display driving on touch sensing through frequency differentiation across zones.
Solution Approach 2:
The system uses periodic display driving with varying frequencies across different zones. By implementing periodic action with frequency modulation, the display function is maintained while the varying frequencies reduce noise interference with touch sensing operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces noise interference and improves the signal-to-noise ratio, leading to enhanced touch sensitivity and robustness in touch display devices, even in self-luminous and large-area configurations.
Implementation Method 1
a touch driving circuit and a touch display device for driving the touch sensors grouped in units of two or more areas with touch driving signals having different touch driving frequencies
Data Source
AI summary
A touch display device and a touch driving circuit are configured to drive at least one of the plurality of first touch electrode lines disposed in a first area with a first touch driving signal having a first touch driving frequency, and drive at least one of the plurality of second touch electrode lines disposed in a second area with a second touch driving signal having a second touch driving frequency that is different from the first touch driving frequency. Each of the first touch driving frequency and the second touch driving frequency is different from a display driving frequency related to display driving. to the touch display device reduces the influence of noise, increases the signal-to-noise ratio, and reduces the influence of driving the display, thereby improving the touch sensitivity.