Integrated Optical Sensing Circuit for Ambient Light and Touch Timing
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Solution Overview
Problem
Existing electronic devices require separate ambient light sensors for adjusting screen brightness and preventing accidental touches, which increases complexity and resource consumption.
Innovation Solution
An integrated driving device incorporates an optical sensing circuit for both in-display fingerprint recognition and ambient light sensing, allowing time-sharing of touch and optical sensing periods to eliminate the need for a standalone ambient light sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate ambient light sensor is added to detect ambient light intensity, then the device can adjust screen brightness and prevent accidental touches, but the device complexity and hardware resources increase
Solution Approach 1:
The optical sensing circuit originally designed for fingerprint recognition is made to serve dual purposes: fingerprint sensing and ambient light detection. By configuring the same optical sensing pixels to perform both functions at different times, the patent eliminates the need for a separate ambient light sensor, thereby reducing device complexity while maintaining adaptability.
Solution Approach 2:
The patent merges the ambient light sensing function with the existing optical sensing circuit for fingerprint recognition. Both functions share the same hardware resources (optical sensing pixels, readout circuits), and the control unit coordinates their operations by time-division multiplexing, combining two previously separate functions into a single integrated system.
2Adaptability or versatility
If the optical sensing circuit performs both fingerprint sensing and ambient light sensing simultaneously, then functionality is enhanced, but the sensing accuracy for both functions may be compromised due to resource competition
Solution Approach 1:
The patent segments the frame period into distinct touch sensing periods and optical sensing periods. During touch sensing periods, the optical sensing circuit performs fingerprint sensing. During optical sensing periods, the same circuit performs ambient light sensing. This temporal segmentation ensures that each function receives dedicated resource allocation without interference from the other, maintaining high measurement precision for both functions.
Solution Approach 2:
The control unit implements periodic action by alternating between touch sensing periods and optical sensing periods in a cyclic manner. This periodic time-division multiplexing allows the optical sensing circuit to switch between fingerprint sensing mode and ambient light sensing mode, ensuring that each function is performed with optimal accuracy when resources are dedicated to it, while still providing continuous dual-functionality.
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
The integrated solution reduces hardware complexity by combining functions, optimizes power usage, and dynamically adjusts screen settings based on ambient light conditions.
Implementation Method 1
an optical sensing circuit configured to perform optical sensing during at least one optical sensing period during the first frame period to obtain optical sensing signals for generating first ambient light information
Data Source
AI summary
An integrated driving device is provided. The integrated driving device includes a touch sensing circuit and an optical sensing circuit. The touch sensing circuit is configured to perform touch sensing in a plurality of touch sensing periods during a first frame period. The optical sensing circuit is configured to perform optical sensing during at least one optical sensing period during the first frame period to obtain optical sensing signals for generating first ambient light information. The touch sensing periods and the optical sensing period are non-overlapping. Correspondingly, an operation method of an integrated driving device is also provided.