Touch Driving Circuit Reset Gating for Low-Power Sleep Switching
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Solution Overview
Problem
Wearable devices experience increased power consumption due to frequent mode changes between standby and active modes, particularly when users frequently interact with touchscreen devices, leading to unnecessary reset operations by the touch driving circuit.
Innovation Solution
The electronic device employs a logic circuit to generate a second reset control signal based on an enable signal and a first reset control signal, preventing the touch driving circuit from resetting during sleep mode, thereby reducing power consumption by minimizing unnecessary reset operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the touch driving circuit performs reset operation during mode changes, then the device can respond quickly to user interactions, but power consumption increases due to frequent reset operations
Solution Approach 1:
The patent changes the state parameter of the touch driving circuit by introducing different operation modes (standby mode and active mode) with distinct reset behaviors. In standby mode, the circuit skips reset operations to save power, while in active mode, normal reset operations occur to ensure responsive touch handling. This parameter-based differentiation resolves the contradiction between response speed and power consumption.
Solution Approach 2:
The patent implements dynamic behavior by allowing the touch driving circuit to adapt its operation based on the current mode state. The circuit dynamically switches between performing reset operations (in active mode for quick response) and skipping reset operations (in standby mode for low power consumption), making the system flexible and context-aware.
2Use of energy by moving object
If the device enters standby mode to reduce power consumption, then battery life is extended, but frequent mode switching increases overall power consumption
Solution Approach 1:
The patent extracts the reset operation from the mandatory sequence in standby mode, allowing the system to remain in standby state without being forced to perform power-consuming reset operations. By selectively removing the reset step during standby mode transitions, the system can maintain low power consumption even with frequent user interactions, reducing the penalty of mode switching.
3Reliability
If the touch driving circuit resets frequently, then touch sensitivity is maintained, but unnecessary reset operations increase power consumption
Solution Approach 1:
The patent changes the operational parameters of the touch driving circuit based on mode state. In standby mode, the circuit operates with reduced functionality (skipping resets) to minimize power consumption, while in active mode, full functionality including regular reset operations is restored to maintain touch sensitivity. This parameter adaptation allows the system to balance reliability and energy efficiency.
Data Source
AI summary
The disclosure provides an electronic device including a host control circuit, a display driving circuit, a touch driving circuit and a logic circuit. The host control circuit is configured to provide a first reset control signal. The display driving circuit is configured to reset according to the first reset control signal. The logic circuit is configured to generate a second reset control signal to the touch driving circuit according to the first reset control signal and an enable signal. During a sleep mode of the electronic device, the enable signal has a first logic level. In response to the enable signal at the first logic level, the logic circuit generates the second reset control signal at the first logic level. The touch driving circuit does not reset according to the second reset control signal at the first logic level.