Touch Display Panel Voltage Recovery via Storage Capacitor
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Solution Overview
Problem
In in-cell touch display panels, the recovery of touch electrode blocks to a common voltage during the display phase is slow due to insufficient driving power from the Integrated Circuit, affecting the transition from touch detection to display mode.
Innovation Solution
Incorporating a switching transistor and a storage capacitor, with control chips managing the charging of the capacitor before the touch detection period and controlling the switching transistor to facilitate rapid charging of touch electrode blocks during the display period, allowing them to be charged both through touch wires and the storage capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the touch display panel uses only the touch wires and IC to supply power for recovering common voltage, then the device complexity is low, but the recovery speed is slow affecting display performance
Solution Approach 1:
The storage capacitor is pre-charged to a preset voltage before the touch detection period. When switching to display mode, this pre-charged capacitor rapidly discharges to restore the common voltage of touch electrode blocks, enabling fast recovery without waiting for the IC to supply power through the slow touch wires.
Solution Approach 2:
The storage capacitor acts as an intermediary power source between the IC and the touch electrode blocks. It stores energy in advance and releases it quickly when needed, mediating the power transfer to achieve fast voltage recovery while the IC maintains overall system control.
Solution Approach 3:
The power supply function is segmented into two parts: the IC provides overall control and baseline power through touch wires, while the storage capacitor provides rapid supplemental power for voltage recovery. This segmentation allows each component to optimize its function without overwhelming complexity.
2Power
If the IC supplies power through touch wires to recover common voltage, then the device structure is simple, but the driving power is insufficient causing slow recovery
Solution Approach 1:
The storage capacitor is pre-charged to a preset voltage before the touch detection period. When switching to display mode, this pre-charged capacitor rapidly discharges to restore the common voltage of touch electrode blocks, enabling fast recovery without waiting for the IC to supply power through the slow touch wires.
Solution Approach 2:
The system changes the voltage parameter of the storage capacitor dynamically - charging it to a preset voltage before touch detection and then allowing it to discharge to provide high current for rapid voltage recovery during display mode, thereby increasing driving power when needed.
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 significantly reduces the time required for touch electrode blocks to resume the common voltage, enhancing the display performance by ensuring quicker charging and reducing the load on the touch control chip.
Implementation Method 1
a storage capacitor, wherein the switching transistor has a gate electrode connected to the first control chip, a source electrode connected to one end of the storage capacitor and a drain electrode connected to the touch electrode block; the other end of the storage capacitor is connected to the second control chip
Data Source
AI summary
A touch display panel, a driving method thereof and a touch display device are disclosed. The touch display panel includes a base substrate, a plurality of touch electrode blocks in an array disposed on the base substrate, and touch wires, and further includes a switching transistor, a storage capacitor, a first control chip and a second control chip. The switching transistor has a gate electrode connected to the first control chip, a source electrode connected to an end of the storage capacitor and a drain electrode connected to the touch electrode block; the first control chip is configured to output a first control signal to control the switching transistor to be turned off, and output a second control signal to control the switching transistor to be turned on; and the second control chip is configured to output a charging signal to charge the storage capacitor.