Touch Display Driving Circuit Pen Finger Sensing Segmentation
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Solution Overview
Problem
Touch display devices face challenges in accurately detecting both finger and pen touches simultaneously due to interference between display driving and touch driving, leading to deteriorated pen-touch sensing accuracy or its disablement.
Innovation Solution
A touch display device with a driving circuit that supplies distinct signals to common electrodes during display periods and blank periods, using modulated signals and different ground voltages to differentiate between finger and pen touches, allowing for simultaneous image display and touch sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display device performs touch driving for sensing finger touch during the display period, then finger touch sensing is enabled, but pen touch sensing accuracy deteriorates or is disabled due to signal interference
Solution Approach 1:
The patent segments the touch sensing function into two distinct modes: finger touch sensing during the display period and pen touch sensing during the display blank period. By dividing the sensing operations into separate time slots, the system eliminates signal interference between display driving and pen touch sensing, thereby improving pen touch sensing accuracy without compromising finger touch functionality.
Solution Approach 2:
The patent implements periodic alternation between different sensing modes synchronized with the display refresh cycle. During the active display period, finger touch sensing is performed; during the blank period, pen touch sensing is performed. This periodic action ensures that each sensing mode operates during optimal conditions, resolving the contradiction between maintaining display performance and achieving accurate pen touch detection.
2Adaptability or versatility
If the display device provides both finger-touch function and pen-touch function simultaneously, then versatility is improved, but touch driving for pen touch sensing is influenced by display driving and finger touch sensing
Solution Approach 1:
The patent dynamically adjusts the sensing mode based on the display timing phase. The system automatically switches between finger touch sensing mode (during display period) and pen touch sensing mode (during blank period), allowing both functions to coexist without mutual interference. This dynamic adaptation maintains versatility while ensuring reliability of each sensing mode during its designated operational window.
Data Source
AI summary
The present embodiments relate to a touch display device, a touch system, a driving circuit, and a driving method. The touch display device may include a display panel configured to have a plurality of data lines, a plurality of gate lines, and a plurality of common electrodes, which are arranged thereon, and a driving circuit configured to supply an uplink signal to at least a subset of the plurality of common electrodes disposed in at least a first region of the display panel during the display blank period to enable the pen to detect the uplink signal when the pen is in contact with or is adjacent to the display panel.