Touch Screen Controller Low-Latency Feedback Sleep State
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Solution Overview
Problem
Conventional electronic systems face inefficiencies and increased latency due to the need for the central processing unit (CPU) to constantly transition between sleep and operating states to process user input for display feedback, which decreases battery life and increases energy consumption.
Innovation Solution
A touch screen controller is used to detect first touch input and change visual display characteristics independently of the CPU's state, allowing for low-latency feedback without waking the CPU from a sleep state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the CPU constantly transitions between sleep and operating states to process user input, then the system can provide display feedback, but battery life decreases and energy consumption increases
Solution Approach 1:
The patent divides the processing system into two independent parts: the CPU that manages power states and the touch screen controller that can process touch input independently. This segmentation allows the touch controller to provide display feedback without requiring the CPU to wake from sleep state, thus resolving the contradiction between maintaining feedback capability and reducing energy consumption.
Solution Approach 2:
The touch screen controller acts as an intermediary between the touch sensor and the display, capable of processing touch input and generating display updates independently. This intermediary function allows the system to maintain display feedback capability while the CPU remains in low-power sleep state, reducing energy consumption.
2Reliability
If the CPU processes all touch input to provide display feedback, then accurate feedback is provided, but latency increases
Solution Approach 1:
By segmenting the processing function, the touch screen controller handles time-critical touch input processing and display updates independently, while the CPU handles higher-level processing. This division eliminates the latency caused by CPU wake-up transitions while maintaining feedback accuracy through the controller's dedicated processing capability.
Data Source
AI summary
Embodiments of the present invention generally provide a touch screen controller coupled to a touch sensor, a display, and a central processing unit. The touch screen controller is configured to detect first touch input received by the touch sensor and change a visual characteristic of the display upon detecting the first touch input. Detecting the first touch input and changing the visual characteristic are performed while the central processing unit is in a sleep state.