Touch Display Driving Circuit Power Segmentation
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Solution Overview
Problem
Touch/display devices face challenges in stabilizing power supply for both display and touch operations, leading to increased power consumption and potential circuit failure due to the inability to distinguish between display and touch driving circuits.
Innovation Solution
A touch/display driving circuit is designed with a multiplexer and power management circuit that selects between main and sub-voltages, generating appropriate driving voltages and modulating signals for touch electrodes, allowing for stable operation regardless of input power type, and includes buck converters to reduce voltage levels and manage power efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If power for touch sensing is solely supplied without distinguishing between display and touch driving circuits, then the circuit configuration is simplified, but the display driving circuit may fail to operate correctly
Solution Approach 1:
The power supply is segmented into two separate power lines: a first power line for supplying main power and a second power line for supplying sub-power. This segmentation allows the touch sensing circuit to receive dedicated sub-power independent of the display driving circuit, ensuring reliable operation while maintaining a relatively simple overall configuration.
Solution Approach 2:
The touch sensing circuit is designed to accept multiple types of power input (main power and sub-power) and can operate in different modes depending on which power is supplied. This multi-functionality allows the same circuit to reliably perform touch sensing whether main power is available or not, without requiring completely separate circuit paths.
2Use of energy by stationary object
If power is supplied differently during display and touch time intervals, then power consumption is reduced, but the touch sensing circuit needs stable power regardless of time-divided intervals
Solution Approach 1:
The system prepares for power supply variations by having the multiplexer and power management circuit ready to switch between main power and sub-power sources in advance. This preliminary preparation ensures that the touch sensing circuit can maintain stable operation without interruption when transitioning between display and touch intervals, even though power consumption is optimized through selective power supply.
3Reliability
If a multiplexer and power management circuit are added to select between main and sub-voltages, then stable operation is achieved, but the device complexity increases
Solution Approach 1:
A multiplexer is introduced as an intermediary component that selectively connects the touch sensing circuit to either the first power line (main power) or the second power line (sub-power). This intermediary allows intelligent power source selection without requiring complex circuit redesign, achieving stable operation with minimal additional complexity.
Solution Approach 2:
The power management circuit automatically determines whether main power or sub-power is supplied and selects the appropriate power source without external intervention. This self-service capability simplifies control logic while ensuring reliable power supply adaptation to different operating conditions.
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 solution enables stable display and touch operations with reduced power consumption by effectively managing power distribution and maintaining normal driving even when main power is not available, simplifying the circuit configuration and reducing overall power usage.
Implementation Method 1
a multiplexer connected to a first power line and a second power line, and configured to select and output one of a first voltage supplied through the first power line or a second voltage supplied through the second power line
Implementation Method 2
a first power circuit configured to generate a first driving voltage and a second driving voltage by using a voltage supplied from the multiplexer
Implementation Method 3
at least one buck converter configured to convert an output voltage into a voltage having a lower level than an input voltage
Implementation Method 4
a touch modulation circuit connected to the power management circuit to modulate a signal transferred to a touch electrode
Data Source
AI summary
A power circuit according to the present disclosure may include a multiplexer connected to a first power line and a second power line and selecting and outputting one of a first voltage supplied through the first power line and a second voltage supplied through the second power line. Further, the power circuit may include a first power circuit which generates a first driving voltage and a second driving voltage by using a voltage supplied from the multiplexer, recognizes whether there is the first voltage supplied through the first power line, and does not output the first driving voltage when the first voltage is not recognized.