Touch Display Power Supply Control for Sleep Wake-Up
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Solution Overview
Problem
Large-sized touch display devices face challenges in waking up from a sleep state using touch input due to complex structures and multiple independent chips, which increase manufacturing costs and design risks, and existing eDP protocols prevent touch event detection during sleep states.
Innovation Solution
A touch display device with a power supply module, including a first and second power supply terminal and a power supply control circuit, where the touch operation processing circuit provides control signals to enable power supply to the power management chip through these terminals, allowing wake-up by touch even in sleep states, simplifying the power supply scheme and reducing external power supply needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple independent chips are used for power management, then functional completeness is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent integrates power management functions, touch control monitoring, and wake-up logic into a single touch display control driver circuit chip, eliminating the need for multiple independent chips (power management chip, touch power supply chip, timing controller chip) and their associated peripheral power chips, thereby simplifying the overall structure while maintaining complete functionality
Solution Approach 2:
The touch display control driver circuit is designed to perform multiple functions including power management, touch event detection during sleep state, timing control, and wake-up processing, allowing a single chip to replace multiple specialized chips and reduce system complexity
2Ease of operation
If peripheral power chips are added for touch control monitoring, then wake-up by touching function is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The touch control monitoring function and wake-up logic are integrated directly into the touch display control driver circuit chip, eliminating the need for separate peripheral power chips that were previously required to monitor touch events during sleep state
Solution Approach 2:
The touch display control driver circuit chip autonomously performs touch event detection and wake-up processing during sleep state without requiring external peripheral chips, using its own integrated circuits to monitor touch panel signals and generate wake-up signals when touch events are detected
3Reliability
If system operating voltage is provided after power off in sleep state, then touch event detection is enabled, but power consumption increases
Solution Approach 1:
During sleep state, only the necessary touch control monitoring circuits within the driver chip remain active at low power, while other functions are powered down, allowing touch event detection without providing full system operating voltage and thus minimizing power consumption
Solution Approach 2:
The system transitions between sleep state (low power) and wake state (full power) based on touch events, with the integrated circuit efficiently managing power state transitions to detect touch events during sleep and activate full power only when necessary
Data Source
AI summary
Touch display device and power supply control method are provided. The touch display device includes power supply module including: power supply control circuit; power management chip provides touch operation processing circuit, touch display control driver circuit and touch integrated circuit with operating voltage; the touch operation processing circuit provides first control signal to control signal output terminal when the touch display device is in sleep-state, to enable the power supply control circuit to supply power to the power management chip via second power supply terminal under control of the first control signal; and provides second control signal to the control signal output terminal when the touch display device is in the sleep-state and the touch display panel is touched, to enable the power supply control circuit to supply power to the power management chip via first power supply terminal under control of the second control signal.