Display PMIC Multiplexer Control for Touch and Panel Power
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Solution Overview
Problem
Current display devices face increased power consumption due to simultaneous operation of display and touch functions, with existing power management integrated circuits (PMICs) failing to efficiently control power distribution across different driving modes, leading to higher panel power consumption and circuit complexity.
Innovation Solution
A PMIC that includes a multiplexer to select between display and touch voltages, a buck circuit to reduce signal levels, and a voltage modulation circuit to generate appropriate driving voltages, enabling dynamic power management and reducing circuit size and component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If power is supplied regardless of the type of operation of the display device, then power consumption is simplified to control, but the power consumption of the panel increases
Solution Approach 1:
The patent implements dynamic power supply control by detecting the operational state (display operation or touch sensing operation) and adjusting the power supply accordingly. The power supply unit selectively supplies power to either the display panel or the touch sensor based on the current operation type, making the power control adaptive rather than static.
Solution Approach 2:
The power supply system is segmented into separate control paths for display operation and touch sensing operation. The power supply unit divides the power distribution into distinct segments based on operational mode, allowing independent control of power delivery to different functional blocks within the display device.
2Use of energy by moving object
If separate power supply for display driving and touch driving is implemented, then power consumption is reduced, but circuit complexity increases
Solution Approach 1:
The power supply unit is designed as a multi-functional component that can perform multiple operations: detecting operational state, selecting appropriate power supply mode, and controlling power distribution. This universal power management block replaces what would otherwise require multiple separate control circuits, reducing overall system complexity while enabling separate power supply for display and touch functions.
Solution Approach 2:
The power supply unit acts as an intermediary between the external power source and the internal functional blocks (display panel and touch sensor). It mediates the power distribution by selectively connecting power to the required block based on operational state, simplifying the control architecture while achieving fine-grained power management.
3Adaptability or versatility
If multiple voltage generation circuits are used for different driving modes, then adaptability to different operations is improved, but device size increases
Solution Approach 1:
The voltage generation circuit implements dynamic voltage output by detecting the operational state and adjusting the output voltage accordingly. Rather than maintaining multiple fixed voltage outputs simultaneously, the circuit dynamically switches between different voltage levels (first voltage for display operation, second voltage for touch sensing operation), achieving adaptability without requiring parallel voltage generation paths.
Solution Approach 2:
The voltage generation circuit is designed as a universal block that can generate different voltage levels based on operational requirements. This single multi-functional voltage generation unit replaces what would otherwise require multiple dedicated voltage generation circuits, reducing the overall circuit area while maintaining adaptability to different driving modes.
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 allows for efficient power management across different driving modes, reducing power consumption and circuit complexity, while enabling both display and touch operations with reduced component sizes and manufacturing costs.
Implementation Method 1
a multiplexer receiving display voltage or touch voltage transferred by a host, selecting one of the display voltage and the touch voltage, and outputting multiplexer output voltage
Implementation Method 2
a buck circuit receiving the multiplexer output voltage, reducing a signal level of the multiplexer output voltage, and generating driving voltage of a timing controller
Implementation Method 3
a voltage modulation circuit receiving the multiplexer output voltage and generating gate high voltage VGH, gate low voltage VGL, common voltage VCOM, and touch/display driving voltage VDD, in which the voltage modulation circuit modulates and outputs a waveform of at least one of the gate high voltage VGH, the gate low voltage VGL, the common voltage VCOM, and the touch/display driving voltage VDD
Data Source
AI summary
The present disclosure relates to a power management circuit including a multiplexer and a power converter, and can provide technology that implements a multiplexer selecting and outputting input power to the power management circuit and a power converter controlling input voltage of a timing controller as one integrated circuit.