Touch Control Display Device with 2D Self-Capacitance Array
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Solution Overview
Problem
Capacitive touch screens face issues with poor anti-interference performance, low scanning frame rate, and complex manufacturing processes, particularly in larger sizes and multi-touch applications.
Innovation Solution
A touch control display device featuring a two-dimensional array of touch sensing electrodes arranged above a common electrode within a liquid crystal display, connected to a touch control chip that detects self-capacitance using a two-dimensional self-capacitance sensing array, enhancing noise reduction and frame rate through simultaneous detection and adjustable parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional capacitive touch screen structures are used, then manufacturing process is simplified, but anti-interference performance deteriorates with noise accumulation on electrodes
Solution Approach 1:
The touch sensing function is segmented from the display structure by using a separate touch control chip bound onto the substrate. This separates the touch detection circuitry from the display driving circuitry, preventing noise accumulation and interference while maintaining manufacturing feasibility through the Chip-on-Glass bonding process.
2Productivity
If traditional scanning methods are used, then device structure is simple, but touch detection frame rate is low
Solution Approach 1:
The touch control chip performs self-detection of capacitance changes at multiple touch points simultaneously through its integrated circuitry. This self-service capability enables high frame rate touch detection without requiring complex external detection systems, as the chip autonomously measures capacitance changes across the entire touch sensing electrode array.
3Adaptability or versatility
If multi-touch detection is implemented, then user interaction capability is improved, but noise accumulation on electrodes increases
Solution Approach 1:
The touch control chip acts as an intermediary between the touch sensing electrodes and the processing system. It directly measures capacitance changes at individual electrode locations through its integrated circuitry, eliminating the need for signal routing through shared electrodes that causes noise accumulation in traditional multi-touch systems.
4Adaptability or versatility
If touch sensing electrodes are added to liquid crystal display, then touch functionality is achieved, but manufacturing complexity increases
Solution Approach 1:
The touch control chip is merged with the liquid crystal display substrate through Chip-on-Glass bonding technology. This integration combines the touch detection functionality with the display structure in a single manufacturing process, avoiding the need for separate assembly steps and reducing overall manufacturing complexity despite adding touch sensing capabilities.
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
Significantly reduces noise interference, enhances touch detection frame rate, and simplifies manufacturing by eliminating noise accumulation and allowing real multi-touch capabilities while improving signal quality and reducing manufacturing complexity.
Implementation Method 1
the touch control chip is configured to detect the self capacitance of each touch sensing electrode and to determine a touch location based on a two-dimensional self capacitance sensing array
Implementation Method 2
a driving/receiving unit, configured to drive the touch sensing electrodes with a voltage source or current source and to receive sensing data from the touch sensing electrodes
Data Source
AI summary
A touch control display device is provided according to embodiments of the disclosure. The touch control display device includes: a first substrate, a second substrate, a liquid crystal layer disposed between the first substrate and the second substrate, a common electrode and a plurality of pixel units; and a plurality of touch sensing electrodes disposed above the common electrode, where the plurality of touch sensing electrodes are arranged in a two-dimensional array. With the solution according to the embodiments of the disclosure, the noise can be reduced and the frame rate of touch detection scan can be enhanced.