Touch Device Latency Measurement System
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Solution Overview
Problem
There is a lack of standardized, inexpensive, and reliable methods to measure and compare touch-input latencies in smart devices, which is crucial for manufacturers aiming to reduce latency in user interfaces across various devices like smartphones, tablets, and computers.
Innovation Solution
A latency measuring system that uses contact and graphical-change sensors to measure the time difference between physical contact and resulting responses on touchscreens, employing computational engines to calculate end-to-end latency, and can simulate touch events to account for internal component latency, providing a standardized and repeatable testing method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standardized measurement methods are implemented, then measurement reliability is improved, but device complexity increases
Solution Approach 1:
The system divides the measurement device into separate functional modules: a contact sensor module that detects touch events, a graphical-change sensor module that captures display changes, and a computational engine that processes timing data. This segmentation allows each module to be optimized independently while maintaining overall system reliability through standardized interfaces and protocols.
2Measurement precision
If multiple sensors and computational engines are used, then measurement precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The computational engine is designed as a universal platform that can process data from various sensor types (contact sensors, graphical-change sensors, audio sensors) and adapt to different touchscreen technologies. This multi-functionality allows the same core processing unit to be used across different device configurations, simplifying manufacturing while maintaining measurement precision through configurable parameters and algorithms.
3Productivity
If automated touch simulation is implemented, then productivity is improved, but device complexity increases
Solution Approach 1:
The system incorporates automated touch simulation capabilities that can pre-program and execute standardized touch sequences before actual latency measurements are taken. This preliminary action establishes baseline performance data and enables repeated testing without manual intervention, significantly improving productivity while the automation logic is encapsulated in software to minimize hardware complexity.
Data Source
AI summary
A system and method are disclosed for measuring latency in a device which includes a user interface that receives user input and provides output in response. In an embodiment, a body separate from the device under test is provided. A first sensor operatively attached to the body detects a touch event input to the device at a first time and a second sensor detects a response output from the device at a second time. A computational engine computes a time differential between the first time and the second time and an output outputs an indication of a measurement of latency in the device, the measurement being reflective of the time differential between the first time and the second time.