Ambient Light Sensor Flicker Detection for Touch Displays
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Solution Overview
Problem
Display devices, particularly touch-sensitive displays, suffer from display flicker due to electromagnetic interference from touch sensors and data communication with external devices, which is challenging to detect and mitigate efficiently without external calibration.
Innovation Solution
Incorporating an ambient light sensor (ALS) beneath the display to detect flicker conditions and applying flicker mitigation operations, such as adjusting electrode voltages, signal phases, and communication frequencies, based on mitigation parameters like stylus position and display characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If touch sensors and data communication operate at high frequencies, then data transmission speed and touch responsiveness are improved, but electromagnetic interference increases causing display flicker
Solution Approach 1:
The patent detects display flicker caused by electromagnetic interference using an ambient light sensor, then applies flicker mitigation operations that adjust touch sensor and data communication operations. The harmful electromagnetic interference is converted into detectable flicker signals that guide the mitigation process, allowing the system to maintain high-frequency operations while reducing their harmful effects through adaptive control.
Solution Approach 2:
The system dynamically changes operational parameters of touch sensors and data communication based on detected flicker conditions. When flicker is detected, the system adjusts frequency, timing, or power levels of these components to reduce electromagnetic interference while maintaining acceptable data transmission speed and touch responsiveness.
2Object-affected harmful factors
If flicker mitigation operations are applied continuously, then display flicker is reduced, but device complexity and power consumption increase
Solution Approach 1:
The patent implements a feedback mechanism where the ambient light sensor continuously monitors for display flicker, and the controller applies flicker mitigation operations only when flicker is detected. This on-demand approach reduces device complexity and power consumption compared to continuous mitigation, while still effectively reducing display flicker when it occurs.
Solution Approach 2:
The system uses the device's existing ambient light sensor for dual purposes: normal ambient light detection and flicker detection. This self-service approach avoids adding dedicated flicker detection hardware, reducing device complexity while maintaining effective flicker mitigation capability.
3Measurement precision
If external calibration equipment is used to detect and mitigate flicker, then measurement precision is improved, but ease of operation and accessibility are worsened
Solution Approach 1:
The patent enables the display device to autonomously detect and mitigate its own flicker using built-in ambient light sensor and controller. This self-diagnosis and self-correction capability eliminates the need for external calibration equipment and manual user intervention, making the device easier to operate while maintaining adequate flicker detection precision for mitigation purposes.
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
Effectively reduces display flicker by minimizing electromagnetic interference, improving user experience without manual calibration, and enhancing human-computer interaction.
Implementation Method 1
Display devices, particularly touch-sensitive displays, suffer from display flicker due to electromagnetic interference from touch sensors and data communication with external devices
Data Source
AI summary
A method for display flicker mitigation includes, at an ambient light sensor (ALS) of a touch-sensitive display device, detecting a display flicker condition affecting a touch-sensitive display of the touch-sensitive display device. One or more flicker mitigation operations are applied to alleviate the display flicker condition based at least in part on one or more flicker mitigation parameters.