In-Cell Touch TFT Voltage Stabilization via Shared Gate
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Solution Overview
Problem
Existing in-cell touch liquid crystal display devices suffer from poor signal stability due to interference from noise in the touch control units.
Innovation Solution
Incorporating a memory capacitor with a capacitance less than the sensing capacitor in the touch control unit, connected to a voltage stabilizing electrode, to stabilize the voltage of the sensor TFT and reduce noise interference, while sharing the gate electrode with the array substrate to simplify the circuit configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a memory capacitor is added to stabilize the voltage of the sensor TFT, then signal stability is improved, but device complexity increases
Solution Approach 1:
The sensor TFT in the touch control unit shares the gate electrode with the array substrate, merging the gate control function. This reduces the number of separate components while maintaining the voltage stabilization function provided by the memory capacitor, thus improving signal stability without proportionally increasing device complexity
Solution Approach 2:
The memory capacitor serves multiple functions: it stabilizes the voltage of the sensor TFT and reduces noise interference. By making this single component perform multiple functions, the need for additional separate components is reduced, balancing the improvement in signal stability with minimal increase in overall device complexity
2Object-affected harmful factors
If the memory capacitor capacitance is made less than the sensing capacitor capacitance, then noise interference is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies that the memory capacitor capacitance should be less than the sensing capacitor capacitance. By changing this parameter relationship, the circuit naturally filters out more high-frequency noise while the gate sharing mechanism helps maintain stable operating conditions, making the capacitance ratio control more robust
3Ease of manufacture
If the gate electrode is shared with the array substrate, then manufacturing cost is reduced, but signal interference risk increases
Solution Approach 1:
The sensor TFT shares the gate electrode with the array substrate, merging the gate control function. This reduces manufacturing complexity and cost by eliminating separate gate electrodes and their associated fabrication steps
Solution Approach 2:
The memory capacitor acts as an intermediary element between the sensor TFT and the shared gate electrode. It provides voltage stabilization and noise filtering that protects the shared gate electrode from signal interference, enabling cost-effective manufacturing without compromising signal integrity
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 approach enhances signal stability and reduces manufacturing costs by maintaining a steady voltage and suppressing noise interference, thereby improving the touch control unit's performance.
Implementation Method 1
a memory capacitor, the capacitance of the memory capacitor being less than that of the sensing capacitor
Data Source
Figure 1
AI summary
Disclosed are a touch control unit, an array substrate, a liquid crystal cell substrate and a touch control display device. The touch control unit comprises a plurality of touch control subunits. Each touch control subunit comprises a touch control thin-film transistor (TFT), a sensing capacitor, a reading sensing line and a storage capacitor. The capacitance of the storage capacitor is smaller than that of the sensing capacitor. A storage capacitor is added to stabilize the voltage of a touch control TFT, thereby reducing the interference of noise with the voltage of the touch control TFT, and effectively improving the signal stability of the touch control unit.