Touch Display Device Independent Electrode Segmentation
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Solution Overview
Problem
Existing touch display devices face interference issues due to noise accumulation when multiple fingers touch the same electrode, leading to false detection and reduced accuracy in touch point detection.
Innovation Solution
A touch display device with a two-dimensional array of independent sensing electrodes connected to a touch control chip via individual wires, allowing for simultaneous driving and detection of each electrode, which reduces capacitance interference and prevents false touches by using self-capacitance detection and adjusting sensitivity parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If horizontal and vertical electrodes are arranged extending on the touch screen from one side to an opposite side, then the electrode coverage area is increased, but noise accumulation occurs when multiple fingers touch the same electrode
Solution Approach 1:
The patent segments the touch detection function by providing each sensing electrode with an independent wire connection to the touch control chip. This segmentation allows each electrode to be detected independently, preventing noise accumulation that occurs when multiple fingers touch the same shared electrode in conventional horizontal-vertical electrode arrangements.
2Manufacturing precision
If multiple sensing electrodes are connected to the touch control chip through a Flexible Printed Circuit (FPC) by wires, then the device complexity is increased, but the manufacturing precision is improved
Solution Approach 1:
The touch control chip performs multiple functions: it controls the liquid crystal display and simultaneously detects touch inputs from multiple sensing electrodes through independent wire connections. This multi-functionality allows the system to achieve high manufacturing precision without proportionally increasing device complexity, as the same control chip handles both display and touch detection.
3Area of stationary object
If the same electrode is touched by multiple fingers, then the touch detection area is effectively increased, but the interference of noises is enhanced
Solution Approach 1:
By providing independent wire connections for each sensing electrode to the touch control chip, the system segments the detection channels so that each electrode's signal is processed separately. This prevents noise from multiple fingers touching the same electrode from being accumulated and amplified, thereby maintaining high reliability even when the effective touch detection area is increased through multiple contact points.
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
This solution enhances noise resistance and accuracy in multi-touch detection, reducing interference and improving the overall performance of touch display devices by allowing real-time detection of multiple touch points without noise accumulation.
Implementation Method 1
the touch control chip is configured to detect the capacitance of each sensing electrode; the touch control chip detects each sensing electrode with a simultaneous driving mode, the touch control chip (10) being configured in the simultaneous driving mode to detect the self-capacitance of each sensing electrode (19, 57)
Implementation Method 2
a liquid crystal layer disposed between the first substrate and the second substrate
Data Source
Figure 1A~1B
Figure 2~3
Figure 4A~4B
AI summary
A touch display device includes: a first substrate, a second substrate and a liquid crystal layer disposed between the first substrate and the second substrate; a plurality of sensing electrodes disposed on the upper surface of the first substrate, where the plurality of sensing electrodes are arranged in a two-dimensional array; a touch control chip bound onto the upper surface of the first substrate, where each of the sensing electrodes is connected to the touch control chip by wires. The touch control chip detects the capacitance of each sensing electrode. The ability of restraining power supply noise is highly improved and the interference of noise in the touch detection is reduced in embodiments of the invention.