Touch Display Panel Ground Modulation Power Management
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Solution Overview
Problem
Touch display devices face performance degradation and increased power consumption when simultaneously performing display driving and touch sensing due to insufficient time allocation and parasitic capacitance issues between display and touch electrodes.
Innovation Solution
A touch display device design that includes separate power sources for display and touch controllers, with a ground modulation circuit to modulate ground voltages, allowing for simultaneous display driving and touch sensing without performance degradation, and power-saving modes by independently controlling these sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If display driving and touch sensing are performed simultaneously, then touch sensing can be performed without time interval restrictions, but display driving performance or touch sensing performance deteriorates due to parasitic capacitance and insufficient time allocation
Solution Approach 1:
The patent divides the power supply system into separate first and second power sources, with the first power source supplying power during display driving periods and the second power source supplying power during touch sensing periods. This segmentation allows independent optimization of each function's power supply timing, resolving the contradiction between simultaneous operation and performance degradation.
Solution Approach 2:
The patent implements periodic switching between display driving and touch sensing operations using controlled time intervals. The display controller and touch controller alternately activate in periodic cycles, with the first power source active during display periods and the second power source active during touch sensing periods, preventing parasitic capacitance accumulation while ensuring adequate time allocation for each function.
2Reliability
If display driving and touch sensing are performed in different time intervals, then parasitic capacitance issues are reduced, but display driving period or touch sensing period becomes insufficient
Solution Approach 1:
The patent dynamically adjusts the timing and duration of display driving and touch sensing periods based on operational requirements. The control system can flexibly allocate time intervals between the two functions, optimizing the balance between preventing parasitic capacitance issues and ensuring sufficient time for each operation to complete effectively.
Solution Approach 2:
The patent changes the temporal parameters of power supply by switching between first and second power sources at different time intervals. By adjusting the timing characteristics of power delivery to the display controller and touch controller, the system optimizes both the prevention of parasitic capacitance effects and the allocation of sufficient operational time for each function.
3Loss of energy
If separate power sources are used for display and touch controllers, then power consumption can be reduced through independent control, but device complexity increases
Solution Approach 1:
The patent designs the power supply system with universal components that can serve multiple functions. The first and second power sources, while separate, are integrated into a unified power management architecture that handles both display driving and touch sensing operations. This multi-functional design reduces overall system complexity despite using separate power sources, as the power management circuitry is optimized to handle both functions efficiently.
Data Source
AI summary
The present disclosure relates to touch display panels and touch display devices. More specifically, the touch display panels and touch display devices provided are capable of performing display driving and touch driving simultaneously or together through a ground modulation scheme. Further, by separating a power source for driving a display controller D-CTR from a power source for driving a touch controller T-CTR, and controlling respective power sources independently, it is possible to reduce power consumption. Also, by enabling a power source for driving a ground modulation circuit to be variable, it is possible to provide functions based on touch sensing under a condition of reduced power consumption.