Receiver Electrode VCOM Control for Display Panel Power Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In display devices with integrated touch sensing, the supply of VCOM voltage to all receiver electrodes during data writing increases parasitic capacitance and power consumption, as all electrodes are turned on to supply voltage, even when not all pixels are being written to.
Innovation Solution
Implementing a method where only the receiver electrodes associated with the pixel regions being written to supply VCOM voltage, while others are made floating, using individually controlled receiver switches to manage VCOM voltage supply during gate scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all receiver electrodes are turned on to supply VCOM voltage during data writing, then the display function is maintained, but parasitic capacitance increases and power consumption increases
Solution Approach 1:
The receiver electrodes are divided into multiple groups, with each group independently controllable. During data writing, only the receiver electrode groups corresponding to the pixel regions being written are activated to supply VCOM voltage, while other groups are turned off or placed in high-impedance state. This segmentation allows selective voltage supply, reducing parasitic capacitance and power consumption while maintaining display functionality in the active regions.
2Stability of the object's composition
If all receiver electrodes are turned on to supply VCOM voltage, then voltage stability is maintained, but charge/discharge current increases
Solution Approach 1:
Different receiver electrode groups are assigned different operational states based on local requirements. Regions undergoing data writing maintain VCOM voltage supply for stability, while regions not being written have their receiver electrodes turned off or placed in high-impedance state to reduce charge/discharge current. This local differentiation optimizes both voltage stability where needed and current reduction where possible.
3Adaptability or versatility
If all receiver electrodes are turned on, then sensing function is maintained, but parasitic capacitance increases
Solution Approach 1:
The operational state of receiver electrode groups is dynamically adjusted based on the current operation phase. During data writing phases, only the necessary receiver electrode groups are activated to minimize parasitic capacitance. During sensing phases, the appropriate receiver electrode groups are activated to maintain sensing functionality. This dynamic control allows the system to adapt to different operational requirements, reducing parasitic capacitance during writing while preserving sensing capability when needed.
Data Source
AI summary
A display device comprises: a display panel comprising a plurality of pixel regions each comprising one or more pixels; a plurality of receiver electrodes respectively associated with the plurality of pixel regions and configured to supply a VCOM voltage; and data write lines configured to transmit data write signals for writing display data into the plurality of pixel regions. One or more but not all of the plurality of receiver electrodes fail to supply the VCOM voltage, while the display data are being written into one or more but not all of the plurality of pixel regions.